From bf266cebe6ec2b9553373e016150d441c5e2c337 Mon Sep 17 00:00:00 2001 From: Vorapol Rinsatitnon Date: Fri, 14 Feb 2025 12:42:07 +0700 Subject: [PATCH] Update to go1.24.0 --- .github/ISSUE_TEMPLATE/11-language-change.yml | 4 +- .gitignore | 2 +- LICENSE | 4 +- VERSION | 4 +- api/go1.24.txt | 223 + codereview.cfg | 2 +- doc/README.md | 2 +- doc/go1.17_spec.html | 2 +- doc/go_mem.html | 2 +- doc/go_spec.html | 302 +- doc/godebug.md | 65 +- doc/initial/1-intro.md | 6 - lib/fips140/Makefile | 46 + lib/fips140/README.md | 9 + lib/fips140/fips140.sum | 12 + lib/fips140/v1.0.0.zip | Bin 0 -> 650281 bytes lib/time/update.bash | 4 +- lib/time/zoneinfo.zip | Bin 401710 -> 406409 bytes {misc => lib}/wasm/go_js_wasm_exec | 0 {misc => lib}/wasm/go_wasip1_wasm_exec | 0 {misc => lib}/wasm/wasm_exec.js | 16 +- {misc => lib}/wasm/wasm_exec_node.js | 1 + misc/wasm/wasm_exec.html | 2 +- ...tch-ProcessPrng-back-to-RtlGenRandom.patch | 86 +- patches/0002-Restore-GOPATH-mode-get.patch | 252 +- 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-> 978 bytes .../certs/P12Mapping1to3subCACert.crt | Bin 0 -> 1000 bytes .../certs/P12Mapping1to3subsubCACert.crt | Bin 0 -> 980 bytes .../certs/P1Mapping1to234CACert.crt | Bin 0 -> 1017 bytes .../certs/P1Mapping1to234subCACert.crt | Bin 0 -> 1002 bytes .../certs/P1anyPolicyMapping1to2CACert.crt | Bin 0 -> 1329 bytes .../certs/PanyPolicyMapping1to2CACert.crt | Bin 0 -> 965 bytes .../nist-pkits/certs/PoliciesP1234CACert.crt | Bin 0 -> 964 bytes .../certs/PoliciesP1234subCAP123Cert.crt | Bin 0 -> 948 bytes .../PoliciesP1234subsubCAP123P12Cert.crt | Bin 0 -> 947 bytes .../nist-pkits/certs/PoliciesP123CACert.crt | Bin 0 -> 949 bytes .../certs/PoliciesP123subCAP12Cert.crt | Bin 0 -> 931 bytes .../certs/PoliciesP123subsubCAP12P1Cert.crt | Bin 0 -> 926 bytes .../certs/PoliciesP123subsubCAP12P2Cert.crt | Bin 0 -> 926 bytes .../PoliciesP123subsubsubCAP12P2P1Cert.crt | Bin 0 -> 936 bytes .../nist-pkits/certs/PoliciesP12CACert.crt | Bin 0 -> 934 bytes .../certs/PoliciesP12subCAP1Cert.crt | Bin 0 -> 912 bytes .../certs/PoliciesP12subsubCAP1P2Cert.crt | Bin 0 -> 922 bytes .../nist-pkits/certs/PoliciesP2subCA2Cert.crt | Bin 0 -> 918 bytes .../nist-pkits/certs/PoliciesP2subCACert.crt | Bin 0 -> 901 bytes .../nist-pkits/certs/PoliciesP3CACert.crt | Bin 0 -> 919 bytes .../RFC3280MandatoryAttributeTypesCACert.crt | Bin 0 -> 980 bytes .../RFC3280OptionalAttributeTypesCACert.crt | Bin 0 -> 992 bytes .../nist-pkits/certs/RevokedsubCACert.crt | Bin 0 -> 897 bytes ...rfromPrintableStringtoUTF8StringCACert.crt | Bin 0 -> 935 bytes ...CertificateandCRLKeysCA2CRLSigningCert.crt | Bin 0 -> 909 bytes ...eandCRLKeysCA2CertificateSigningCACert.crt | Bin 0 -> 926 bytes ...ateCertificateandCRLKeysCRLSigningCert.crt | Bin 0 -> 909 bytes ...cateandCRLKeysCertificateSigningCACert.crt | Bin 0 -> 926 bytes .../certs/TrustAnchorRootCertificate.crt | Bin 0 -> 843 bytes .../nist-pkits/certs/TwoCRLsCACert.crt | Bin 0 -> 900 bytes .../testdata/nist-pkits/certs/UIDCACert.crt | Bin 0 -> 900 bytes 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...lidSelfIssuedpathLenConstraintTest17EE.crt | Bin 0 -> 941 bytes ...SelfIssuedrequireExplicitPolicyTest6EE.crt | Bin 0 -> 920 bytes ...dSeparateCertificateandCRLKeysTest19EE.crt | Bin 0 -> 958 bytes .../nist-pkits/certs/ValidTwoCRLsTest7EE.crt | Bin 0 -> 906 bytes .../certs/ValidURInameConstraintsTest34EE.crt | Bin 0 -> 994 bytes .../certs/ValidURInameConstraintsTest36EE.crt | Bin 0 -> 997 bytes ...UTF8StringCaseInsensitiveMatchTest11EE.crt | Bin 0 -> 962 bytes .../ValidUTF8StringEncodedNamesTest9EE.crt | Bin 0 -> 924 bytes ...NotCriticalCertificateExtensionTest1EE.crt | Bin 0 -> 952 bytes ...alidbasicConstraintsNotCriticalTest4EE.crt | Bin 0 -> 948 bytes .../certs/ValidcRLIssuerTest28EE.crt | Bin 0 -> 1156 bytes .../certs/ValidcRLIssuerTest29EE.crt | Bin 0 -> 1065 bytes .../certs/ValidcRLIssuerTest30EE.crt | Bin 0 -> 1156 bytes .../certs/ValidcRLIssuerTest33EE.crt | Bin 0 -> 1134 bytes .../nist-pkits/certs/ValiddeltaCRLTest2EE.crt | Bin 0 -> 1091 bytes 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.../certs/ValidpathLenConstraintTest14EE.crt | Bin 0 -> 955 bytes .../certs/ValidpathLenConstraintTest7EE.crt | Bin 0 -> 925 bytes .../certs/ValidpathLenConstraintTest8EE.crt | Bin 0 -> 942 bytes .../Validpre2000UTCnotBeforeDateTest3EE.crt | Bin 0 -> 920 bytes .../ValidrequireExplicitPolicyTest1EE.crt | Bin 0 -> 918 bytes .../ValidrequireExplicitPolicyTest2EE.crt | Bin 0 -> 917 bytes .../ValidrequireExplicitPolicyTest4EE.crt | Bin 0 -> 942 bytes .../nist-pkits/certs/WrongCRLCACert.crt | Bin 0 -> 901 bytes .../nist-pkits/certs/anyPolicyCACert.crt | Bin 0 -> 911 bytes .../basicConstraintsCriticalcAFalseCACert.crt | Bin 0 -> 923 bytes .../basicConstraintsNotCriticalCACert.crt | Bin 0 -> 918 bytes ...sicConstraintsNotCriticalcAFalseCACert.crt | Bin 0 -> 924 bytes .../nist-pkits/certs/deltaCRLCA1Cert.crt | Bin 0 -> 901 bytes .../nist-pkits/certs/deltaCRLCA2Cert.crt | Bin 0 -> 901 bytes .../nist-pkits/certs/deltaCRLCA3Cert.crt | Bin 0 -> 901 bytes .../certs/deltaCRLIndicatorNoBaseCACert.crt | Bin 0 -> 917 bytes .../certs/distributionPoint1CACert.crt | Bin 0 -> 910 bytes .../certs/distributionPoint2CACert.crt | Bin 0 -> 910 bytes .../nist-pkits/certs/indirectCRLCA1Cert.crt | Bin 0 -> 904 bytes .../nist-pkits/certs/indirectCRLCA2Cert.crt | Bin 0 -> 904 bytes .../nist-pkits/certs/indirectCRLCA3Cert.crt | Bin 0 -> 904 bytes .../certs/indirectCRLCA3cRLIssuerCert.crt | Bin 0 -> 1010 bytes .../nist-pkits/certs/indirectCRLCA4Cert.crt | Bin 0 -> 904 bytes .../certs/indirectCRLCA4cRLIssuerCert.crt | Bin 0 -> 1144 bytes .../nist-pkits/certs/indirectCRLCA5Cert.crt | Bin 0 -> 904 bytes .../nist-pkits/certs/indirectCRLCA6Cert.crt | Bin 0 -> 904 bytes .../certs/inhibitAnyPolicy0CACert.crt | Bin 0 -> 940 bytes .../certs/inhibitAnyPolicy1CACert.crt | Bin 0 -> 940 bytes .../inhibitAnyPolicy1SelfIssuedCACert.crt | Bin 0 -> 917 bytes .../inhibitAnyPolicy1SelfIssuedsubCA2Cert.crt | Bin 0 -> 919 bytes .../certs/inhibitAnyPolicy1subCA1Cert.crt | Bin 0 -> 915 bytes .../certs/inhibitAnyPolicy1subCA2Cert.crt | Bin 0 -> 915 bytes .../certs/inhibitAnyPolicy1subCAIAP5Cert.crt | Bin 0 -> 941 bytes .../certs/inhibitAnyPolicy1subsubCA2Cert.crt | Bin 0 -> 922 bytes .../certs/inhibitAnyPolicy5CACert.crt | Bin 0 -> 940 bytes .../certs/inhibitAnyPolicy5subCACert.crt | Bin 0 -> 937 bytes .../certs/inhibitAnyPolicy5subsubCACert.crt | Bin 0 -> 926 bytes .../certs/inhibitAnyPolicyTest3EE.crt | Bin 0 -> 921 bytes .../certs/inhibitPolicyMapping0CACert.crt | Bin 0 -> 935 bytes .../certs/inhibitPolicyMapping0subCACert.crt | Bin 0 -> 970 bytes .../certs/inhibitPolicyMapping1P12CACert.crt | Bin 0 -> 953 bytes .../inhibitPolicyMapping1P12subCACert.crt | Bin 0 -> 1018 bytes .../inhibitPolicyMapping1P12subCAIPM5Cert.crt | Bin 0 -> 973 bytes .../inhibitPolicyMapping1P12subsubCACert.crt | Bin 0 -> 998 bytes ...hibitPolicyMapping1P12subsubCAIPM5Cert.crt | Bin 0 -> 1006 bytes .../certs/inhibitPolicyMapping1P1CACert.crt | Bin 0 -> 938 bytes ...nhibitPolicyMapping1P1SelfIssuedCACert.crt | Bin 0 -> 931 bytes ...bitPolicyMapping1P1SelfIssuedsubCACert.crt | Bin 0 -> 979 bytes .../inhibitPolicyMapping1P1subCACert.crt | Bin 0 -> 976 bytes .../inhibitPolicyMapping1P1subsubCACert.crt | Bin 0 -> 982 bytes .../certs/inhibitPolicyMapping5CACert.crt | Bin 0 -> 935 bytes .../certs/inhibitPolicyMapping5subCACert.crt | Bin 0 -> 947 bytes .../inhibitPolicyMapping5subsubCACert.crt | Bin 0 -> 934 bytes .../inhibitPolicyMapping5subsubsubCACert.crt | Bin 0 -> 982 bytes .../keyUsageCriticalcRLSignFalseCACert.crt | Bin 0 -> 923 bytes ...keyUsageCriticalkeyCertSignFalseCACert.crt | Bin 0 -> 927 bytes .../certs/keyUsageNotCriticalCACert.crt | Bin 0 -> 910 bytes .../keyUsageNotCriticalcRLSignFalseCACert.crt | Bin 0 -> 924 bytes ...UsageNotCriticalkeyCertSignFalseCACert.crt | Bin 0 -> 928 bytes .../certs/nameConstraintsDN1CACert.crt | Bin 0 -> 1009 bytes .../nameConstraintsDN1SelfIssuedCACert.crt | Bin 0 -> 921 bytes 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17 + test/fixedbugs/issue70189.go | 38 + test/fixedbugs/issue70481.go | 20 + test/fixedbugs/issue70481.out | 19 + test/fixedbugs/notinheap.go | 34 +- test/func3.go | 6 +- test/fuse.go | 8 +- test/initloop.go | 2 +- test/inline.go | 8 +- test/inline_testingbloop.go | 37 + test/internal/runtime/sys/README | 7 + .../runtime/sys}/inlinegcpc.go | 16 +- test/intrinsic.dir/main.go | 2 +- test/live.go | 20 +- test/live2.go | 4 +- test/live_regabi.go | 21 +- test/loopbce.go | 22 +- test/newinline.go | 8 +- test/nosplit.go | 2 +- test/prove.go | 632 +- test/prove_constant_folding.go | 4 +- test/runtime/README | 7 - test/switch2.go | 4 +- test/syntax/semi7.go | 2 +- test/tailcall.go | 29 + test/wasmexport.go | 19 + test/wasmexport2.go | 92 + test/wasmmemsize.dir/asm_wasm.s | 11 + test/wasmmemsize.dir/main.go | 30 + test/wasmmemsize.go | 11 + test/weak.go | 24 + 3169 files changed, 236789 insertions(+), 60275 deletions(-) create mode 100644 api/go1.24.txt create mode 100644 lib/fips140/Makefile create mode 100644 lib/fips140/README.md create mode 100644 lib/fips140/fips140.sum create mode 100644 lib/fips140/v1.0.0.zip rename {misc => lib}/wasm/go_js_wasm_exec (100%) rename {misc => lib}/wasm/go_wasip1_wasm_exec (100%) rename {misc => lib}/wasm/wasm_exec.js (97%) rename {misc => lib}/wasm/wasm_exec_node.js (97%) rename patches/{0004-Add-back-LoadLibraryA-fallback.patch => 0003-Add-back-LoadLibraryA-fallback.patch} (94%) delete mode 100644 patches/0003-Restore-related-GOPATH-mode-go-get-functions.patch create mode 100644 patches/0004-Add-Windows-7-console-and-process-handle-workaround.patch delete mode 100644 patches/0005-Add-Windows-7-console-handle-workaround.patch rename patches/{0006-Add-sysSocket-fallback.patch => 0005-Add-sysSocket-fallback.patch} (96%) delete mode 100644 patches/0007-Add-Windows-version-info-to-syscall.patch delete mode 100644 patches/0008-Add-5ms-sleep-on-Windows-7-8-in-Process-.Wait.patch create mode 100644 src/bytes/iter.go rename src/cmd/{vendor/golang.org/x/tools/internal/versions/toolchain_go119.go => cgo/internal/testerrors/testdata/issue67699a.go} (56%) rename src/cmd/{vendor/golang.org/x/tools/internal/versions/toolchain_go121.go => cgo/internal/testerrors/testdata/issue67699b.go} (61%) create mode 100644 src/cmd/cgo/internal/testerrors/testdata/issue69176.go create mode 100644 src/cmd/cgo/internal/testsanitizers/testdata/asan_fuzz_test.go create mode 100644 src/cmd/compile/internal/deadlocals/deadlocals.go delete mode 100644 src/cmd/compile/internal/importer/exportdata.go delete mode 100644 src/cmd/compile/internal/importer/iimport.go create mode 100644 src/cmd/compile/internal/importer/testdata/issue69912.go delete mode 100644 src/cmd/compile/internal/noder/stencil.go delete mode 100644 src/cmd/compile/internal/noder/stmt.go create mode 100644 src/cmd/compile/internal/reflectdata/map_noswiss.go create mode 100644 src/cmd/compile/internal/reflectdata/map_swiss.go create mode 100644 src/cmd/compile/internal/ssa/_gen/go.mod create mode 100644 src/cmd/compile/internal/ssa/_gen/go.sum create mode 100644 src/cmd/compile/internal/ssagen/intrinsics.go create mode 100644 src/cmd/compile/internal/ssagen/intrinsics_test.go create mode 100644 src/cmd/compile/internal/syntax/testdata/issue68589.go create mode 100644 src/cmd/compile/internal/syntax/testdata/issue69506.go create mode 100644 src/cmd/compile/internal/syntax/testdata/issue70974.go create mode 100644 src/cmd/compile/internal/test/issue62407_test.go delete mode 100644 src/cmd/compile/internal/types/sort.go create mode 100644 src/cmd/compile/internal/types2/README.md create mode 100644 src/cmd/compile/internal/types2/literals.go create mode 100644 src/cmd/compile/internal/types2/recording.go create mode 100644 src/cmd/compile/internal/types2/testdata/local/issue68183.go create mode 100644 src/cmd/compile/internal/types2/testdata/local/issue71254.go create mode 100644 src/cmd/compile/script_test.go create mode 100644 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src/runtime/asm_riscv64.h create mode 100644 src/runtime/bitcursor_test.go create mode 100644 src/runtime/export_debug_loong64_test.go create mode 100644 src/runtime/export_map_noswiss_test.go create mode 100644 src/runtime/export_map_swiss_test.go create mode 100644 src/runtime/ints.s create mode 100644 src/runtime/linkname_swiss.go create mode 100644 src/runtime/lock_futex_tristate.go create mode 100644 src/runtime/lock_sema_tristate.go create mode 100644 src/runtime/lock_spinbit.go rename src/runtime/{map_fast32.go => map_fast32_noswiss.go} (87%) create mode 100644 src/runtime/map_fast32_swiss.go rename src/runtime/{map_fast64.go => map_fast64_noswiss.go} (87%) create mode 100644 src/runtime/map_fast64_swiss.go rename src/runtime/{map_faststr.go => map_faststr_noswiss.go} (80%) create mode 100644 src/runtime/map_faststr_swiss.go rename src/runtime/{map.go => map_noswiss.go} (91%) create mode 100644 src/runtime/map_noswiss_test.go create mode 100644 src/runtime/map_swiss.go create mode 100644 src/runtime/map_swiss_test.go create mode 100644 src/runtime/mcleanup.go create mode 100644 src/runtime/mcleanup_test.go create mode 100644 src/runtime/mem_nonsbrk.go rename src/runtime/{norace_linux_test.go => nosan_linux_test.go} (76%) create mode 100644 src/runtime/note_js.go create mode 100644 src/runtime/note_other.go create mode 100644 src/runtime/stubs_nonwasm.go create mode 100644 src/runtime/stubs_wasm.go create mode 100644 src/runtime/synctest.go create mode 100644 src/runtime/synctest_test.go create mode 100644 src/runtime/testdata/testprogcgo/issue63739.go create mode 100644 src/runtime/testdata/testsynctest/main.go create mode 100644 src/runtime/vgetrandom_linux.go create mode 100644 src/runtime/vgetrandom_unsupported.go delete mode 100644 src/sort/sort_impl_120.go delete mode 100644 src/sort/sort_impl_go121.go create mode 100644 src/strings/iter.go create mode 100644 src/sync/atomic/doc_32.go create mode 100644 src/sync/atomic/doc_64.go create mode 100644 src/sync/hashtriemap.go delete mode 100644 src/syscall/syscall_linux_accept.go delete mode 100644 src/syscall/syscall_linux_accept4.go create mode 100644 src/testing/example_loop_test.go create mode 100644 src/testing/loop_test.go create mode 100644 src/testing/synctest/context_example_test.go create mode 100644 src/testing/synctest/synctest.go create mode 100644 src/time/abs_test.go create mode 100644 src/time/linkname_test.go rename src/vendor/golang.org/x/crypto/chacha20/{chacha_ppc64le.go => chacha_ppc64x.go} (89%) rename src/vendor/golang.org/x/crypto/chacha20/{chacha_ppc64le.s => chacha_ppc64x.s} (76%) delete mode 100644 src/vendor/golang.org/x/crypto/hkdf/hkdf.go rename src/vendor/golang.org/x/crypto/internal/poly1305/{sum_ppc64le.go => sum_ppc64x.go} (95%) rename src/vendor/golang.org/x/crypto/internal/poly1305/{sum_ppc64le.s => sum_ppc64x.s} (89%) delete mode 100644 src/vendor/golang.org/x/crypto/sha3/doc.go delete mode 100644 src/vendor/golang.org/x/crypto/sha3/hashes.go delete mode 100644 src/vendor/golang.org/x/crypto/sha3/hashes_noasm.go delete mode 100644 src/vendor/golang.org/x/crypto/sha3/keccakf_amd64.go delete mode 100644 src/vendor/golang.org/x/crypto/sha3/keccakf_amd64.s delete mode 100644 src/vendor/golang.org/x/crypto/sha3/register.go delete mode 100644 src/vendor/golang.org/x/crypto/sha3/sha3.go delete mode 100644 src/vendor/golang.org/x/crypto/sha3/sha3_s390x.go delete mode 100644 src/vendor/golang.org/x/crypto/sha3/shake.go delete mode 100644 src/vendor/golang.org/x/crypto/sha3/shake_noasm.go delete mode 100644 src/vendor/golang.org/x/crypto/sha3/xor.go create mode 100644 src/vendor/golang.org/x/sys/cpu/asm_darwin_x86_gc.s create mode 100644 src/vendor/golang.org/x/sys/cpu/cpu_darwin_x86.go rename src/vendor/golang.org/x/sys/cpu/{cpu_x86.s => cpu_gc_x86.s} (94%) create mode 100644 src/vendor/golang.org/x/sys/cpu/cpu_linux_riscv64.go create mode 100644 src/vendor/golang.org/x/sys/cpu/cpu_other_x86.go create mode 100644 src/vendor/golang.org/x/sys/cpu/syscall_darwin_x86_gc.go create mode 100644 src/weak/doc.go create mode 100644 src/weak/pointer.go rename src/{internal => }/weak/pointer_test.go (77%) rename src/cmd/vendor/golang.org/x/tools/cmd/bisect/go119.go => test/codegen/issue59297.go (52%) create mode 100644 test/codegen/issue68845.go create mode 100644 test/codegen/issue69635.go create mode 100644 test/codegen/spills.go create mode 100644 test/codegen/typeswitch.go create mode 100644 test/codegen/unsafe.go create mode 100644 test/fixedbugs/issue16241.go create mode 100644 test/fixedbugs/issue16241_64.go create mode 100644 test/fixedbugs/issue20027.go create mode 100644 test/fixedbugs/issue24755.go create mode 100644 test/fixedbugs/issue67329.go create mode 100644 test/fixedbugs/issue68292.go create mode 100644 test/fixedbugs/issue68526.dir/a/a.go create mode 100644 test/fixedbugs/issue68526.dir/main.go create mode 100644 test/fixedbugs/issue68526.go create mode 100644 test/fixedbugs/issue68734.go create mode 100644 test/fixedbugs/issue68809.go create mode 100644 test/fixedbugs/issue68816.go create mode 100644 test/fixedbugs/issue69825.go create mode 100644 test/fixedbugs/issue70156.go create mode 100644 test/fixedbugs/issue70175.go create mode 100644 test/fixedbugs/issue70189.go create mode 100644 test/fixedbugs/issue70481.go create mode 100644 test/fixedbugs/issue70481.out create mode 100644 test/inline_testingbloop.go create mode 100644 test/internal/runtime/sys/README rename test/{runtime => internal/runtime/sys}/inlinegcpc.go (54%) delete mode 100644 test/runtime/README create mode 100644 test/tailcall.go create mode 100644 test/wasmexport.go create mode 100644 test/wasmexport2.go create mode 100644 test/wasmmemsize.dir/asm_wasm.s create mode 100644 test/wasmmemsize.dir/main.go create mode 100644 test/wasmmemsize.go create mode 100644 test/weak.go diff --git a/.github/ISSUE_TEMPLATE/11-language-change.yml b/.github/ISSUE_TEMPLATE/11-language-change.yml index 37ba2d7e..ac26ef6c 100644 --- a/.github/ISSUE_TEMPLATE/11-language-change.yml +++ b/.github/ISSUE_TEMPLATE/11-language-change.yml @@ -1,7 +1,7 @@ name: Language Change Proposals description: Changes to the language -labels: ["Proposal", "v2", "LanguageChange"] -title: "proposal: Go 2: proposal title" +labels: ["Proposal", "LanguageChange", "LanguageChangeReview"] +title: "proposal: spec: proposal title" body: diff --git a/.gitignore b/.gitignore index 7978d68b..c6512e64 100644 --- a/.gitignore +++ b/.gitignore @@ -37,7 +37,7 @@ _testmain.go /src/go/build/zcgo.go /src/go/doc/headscan /src/internal/buildcfg/zbootstrap.go -/src/runtime/internal/sys/zversion.go +/src/internal/runtime/sys/zversion.go /src/unicode/maketables /src/time/tzdata/zzipdata.go /test.out diff --git a/LICENSE b/LICENSE index 6a66aea5..2a7cf70d 100644 --- a/LICENSE +++ b/LICENSE @@ -1,4 +1,4 @@ -Copyright (c) 2009 The Go Authors. All rights reserved. +Copyright 2009 The Go Authors. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are @@ -10,7 +10,7 @@ notice, this list of conditions and the following disclaimer. copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. - * Neither the name of Google Inc. nor the names of its + * Neither the name of Google LLC nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. diff --git a/VERSION b/VERSION index 1734c2d8..a4380700 100644 --- a/VERSION +++ b/VERSION @@ -1,2 +1,2 @@ -go1.23.6 -time 2025-01-31T18:38:03Z +go1.24.0 +time 2025-02-10T23:33:55Z diff --git a/api/go1.24.txt b/api/go1.24.txt new file mode 100644 index 00000000..05e2006e --- /dev/null +++ b/api/go1.24.txt @@ -0,0 +1,223 @@ +pkg bytes, func FieldsFuncSeq([]uint8, func(int32) bool) iter.Seq[[]uint8] #61901 +pkg bytes, func FieldsSeq([]uint8) iter.Seq[[]uint8] #61901 +pkg bytes, func Lines([]uint8) iter.Seq[[]uint8] #61901 +pkg bytes, func SplitAfterSeq([]uint8, []uint8) iter.Seq[[]uint8] #61901 +pkg bytes, func SplitSeq([]uint8, []uint8) iter.Seq[[]uint8] #61901 +pkg crypto/cipher, func NewCFBDecrypter //deprecated #69445 +pkg crypto/cipher, func NewCFBEncrypter //deprecated #69445 +pkg crypto/cipher, func NewGCMWithRandomNonce(Block) (AEAD, error) #69981 +pkg crypto/cipher, func NewOFB //deprecated #69445 +pkg crypto/fips140, func Enabled() bool #70123 +pkg crypto/hkdf, func Expand[$0 hash.Hash](func() $0, []uint8, string, int) ([]uint8, error) #61477 +pkg crypto/hkdf, func Extract[$0 hash.Hash](func() $0, []uint8, []uint8) ([]uint8, error) #61477 +pkg crypto/hkdf, func Key[$0 hash.Hash](func() $0, []uint8, []uint8, string, int) ([]uint8, error) #61477 +pkg crypto/mlkem, const CiphertextSize1024 = 1568 #70122 +pkg crypto/mlkem, const CiphertextSize1024 ideal-int #70122 +pkg crypto/mlkem, const CiphertextSize768 = 1088 #70122 +pkg crypto/mlkem, const CiphertextSize768 ideal-int #70122 +pkg crypto/mlkem, const EncapsulationKeySize1024 = 1568 #70122 +pkg crypto/mlkem, const EncapsulationKeySize1024 ideal-int #70122 +pkg crypto/mlkem, const EncapsulationKeySize768 = 1184 #70122 +pkg crypto/mlkem, const EncapsulationKeySize768 ideal-int #70122 +pkg crypto/mlkem, const SeedSize = 64 #70122 +pkg crypto/mlkem, const SeedSize ideal-int #70122 +pkg crypto/mlkem, const SharedKeySize = 32 #70122 +pkg crypto/mlkem, const SharedKeySize ideal-int #70122 +pkg crypto/mlkem, func GenerateKey1024() (*DecapsulationKey1024, error) #70122 +pkg crypto/mlkem, func GenerateKey768() (*DecapsulationKey768, error) #70122 +pkg crypto/mlkem, func NewDecapsulationKey1024([]uint8) (*DecapsulationKey1024, error) #70122 +pkg crypto/mlkem, func NewDecapsulationKey768([]uint8) (*DecapsulationKey768, error) #70122 +pkg crypto/mlkem, func NewEncapsulationKey1024([]uint8) (*EncapsulationKey1024, error) #70122 +pkg crypto/mlkem, func NewEncapsulationKey768([]uint8) (*EncapsulationKey768, error) #70122 +pkg crypto/mlkem, method (*DecapsulationKey1024) Bytes() []uint8 #70122 +pkg crypto/mlkem, method (*DecapsulationKey1024) Decapsulate([]uint8) ([]uint8, error) #70122 +pkg crypto/mlkem, method (*DecapsulationKey1024) EncapsulationKey() *EncapsulationKey1024 #70122 +pkg crypto/mlkem, method (*DecapsulationKey768) Bytes() []uint8 #70122 +pkg crypto/mlkem, method (*DecapsulationKey768) Decapsulate([]uint8) ([]uint8, error) #70122 +pkg crypto/mlkem, method (*DecapsulationKey768) EncapsulationKey() *EncapsulationKey768 #70122 +pkg crypto/mlkem, method (*EncapsulationKey1024) Bytes() []uint8 #70122 +pkg crypto/mlkem, method (*EncapsulationKey1024) Encapsulate() ([]uint8, []uint8) #70122 +pkg crypto/mlkem, method (*EncapsulationKey768) Bytes() []uint8 #70122 +pkg crypto/mlkem, method (*EncapsulationKey768) Encapsulate() ([]uint8, []uint8) #70122 +pkg crypto/mlkem, type DecapsulationKey1024 struct #70122 +pkg crypto/mlkem, type DecapsulationKey768 struct #70122 +pkg crypto/mlkem, type EncapsulationKey1024 struct #70122 +pkg crypto/mlkem, type EncapsulationKey768 struct #70122 +pkg crypto/pbkdf2, func Key[$0 hash.Hash](func() $0, string, []uint8, int, int) ([]uint8, error) #69488 +pkg crypto/rand, func Text() string #67057 +pkg crypto/sha3, func New224() *SHA3 #69982 +pkg crypto/sha3, func New256() *SHA3 #69982 +pkg crypto/sha3, func New384() *SHA3 #69982 +pkg crypto/sha3, func New512() *SHA3 #69982 +pkg crypto/sha3, func NewCSHAKE128([]uint8, []uint8) *SHAKE #69982 +pkg crypto/sha3, func NewCSHAKE256([]uint8, []uint8) *SHAKE #69982 +pkg crypto/sha3, func NewSHAKE128() *SHAKE #69982 +pkg crypto/sha3, func NewSHAKE256() *SHAKE #69982 +pkg crypto/sha3, func Sum224([]uint8) [28]uint8 #69982 +pkg crypto/sha3, func Sum256([]uint8) [32]uint8 #69982 +pkg crypto/sha3, func Sum384([]uint8) [48]uint8 #69982 +pkg crypto/sha3, func Sum512([]uint8) [64]uint8 #69982 +pkg crypto/sha3, func SumSHAKE128([]uint8, int) []uint8 #69982 +pkg crypto/sha3, func SumSHAKE256([]uint8, int) []uint8 #69982 +pkg crypto/sha3, method (*SHA3) AppendBinary([]uint8) ([]uint8, error) #69982 +pkg crypto/sha3, method (*SHA3) BlockSize() int #69982 +pkg crypto/sha3, method (*SHA3) MarshalBinary() ([]uint8, error) #69982 +pkg crypto/sha3, method (*SHA3) Reset() #69982 +pkg crypto/sha3, method (*SHA3) Size() int #69982 +pkg crypto/sha3, method (*SHA3) Sum([]uint8) []uint8 #69982 +pkg crypto/sha3, method (*SHA3) UnmarshalBinary([]uint8) error #69982 +pkg crypto/sha3, method (*SHA3) Write([]uint8) (int, error) #69982 +pkg crypto/sha3, method (*SHAKE) AppendBinary([]uint8) ([]uint8, error) #69982 +pkg crypto/sha3, method (*SHAKE) BlockSize() int #69982 +pkg crypto/sha3, method (*SHAKE) MarshalBinary() ([]uint8, error) #69982 +pkg crypto/sha3, method (*SHAKE) Read([]uint8) (int, error) #69982 +pkg crypto/sha3, method (*SHAKE) Reset() #69982 +pkg crypto/sha3, method (*SHAKE) UnmarshalBinary([]uint8) error #69982 +pkg crypto/sha3, method (*SHAKE) Write([]uint8) (int, error) #69982 +pkg crypto/sha3, type SHA3 struct #69982 +pkg crypto/sha3, type SHAKE struct #69982 +pkg crypto/subtle, func WithDataIndependentTiming(func()) #66450 +pkg crypto/tls, const X25519MLKEM768 = 4588 #69985 +pkg crypto/tls, const X25519MLKEM768 CurveID #69985 +pkg crypto/tls, type ClientHelloInfo struct, Extensions []uint16 #32936 +pkg crypto/tls, type Config struct, EncryptedClientHelloKeys []EncryptedClientHelloKey #68500 +pkg crypto/tls, type EncryptedClientHelloKey struct #68500 +pkg crypto/tls, type EncryptedClientHelloKey struct, Config []uint8 #68500 +pkg crypto/tls, type EncryptedClientHelloKey struct, PrivateKey []uint8 #68500 +pkg crypto/tls, type EncryptedClientHelloKey struct, SendAsRetry bool #68500 +pkg crypto/x509, const NoValidChains = 10 #68484 +pkg crypto/x509, const NoValidChains InvalidReason #68484 +pkg crypto/x509, method (OID) AppendBinary([]uint8) ([]uint8, error) #62384 +pkg crypto/x509, method (OID) AppendText([]uint8) ([]uint8, error) #62384 +pkg crypto/x509, type Certificate struct, InhibitAnyPolicy int #68484 +pkg crypto/x509, type Certificate struct, InhibitAnyPolicyZero bool #68484 +pkg crypto/x509, type Certificate struct, InhibitPolicyMapping int #68484 +pkg crypto/x509, type Certificate struct, InhibitPolicyMappingZero bool #68484 +pkg crypto/x509, type Certificate struct, PolicyMappings []PolicyMapping #68484 +pkg crypto/x509, type Certificate struct, RequireExplicitPolicy int #68484 +pkg crypto/x509, type Certificate struct, RequireExplicitPolicyZero bool #68484 +pkg crypto/x509, type PolicyMapping struct #68484 +pkg crypto/x509, type PolicyMapping struct, IssuerDomainPolicy OID #68484 +pkg crypto/x509, type PolicyMapping struct, SubjectDomainPolicy OID #68484 +pkg crypto/x509, type VerifyOptions struct, CertificatePolicies []OID #68484 +pkg debug/elf, const VER_FLG_BASE = 1 #63952 +pkg debug/elf, const VER_FLG_BASE DynamicVersionFlag #63952 +pkg debug/elf, const VER_FLG_INFO = 4 #63952 +pkg debug/elf, const VER_FLG_INFO DynamicVersionFlag #63952 +pkg debug/elf, const VER_FLG_WEAK = 2 #63952 +pkg debug/elf, const VER_FLG_WEAK DynamicVersionFlag #63952 +pkg debug/elf, method (*File) DynamicVersionNeeds() ([]DynamicVersionNeed, error) #63952 +pkg debug/elf, method (*File) DynamicVersions() ([]DynamicVersion, error) #63952 +pkg debug/elf, type DynamicVersion struct #63952 +pkg debug/elf, type DynamicVersion struct, Deps []string #63952 +pkg debug/elf, type DynamicVersion struct, Flags DynamicVersionFlag #63952 +pkg debug/elf, type DynamicVersion struct, Name string #63952 +pkg debug/elf, type DynamicVersion struct, Index uint16 #63952 +pkg debug/elf, type DynamicVersionDep struct #63952 +pkg debug/elf, type DynamicVersionDep struct, Dep string #63952 +pkg debug/elf, type DynamicVersionDep struct, Flags DynamicVersionFlag #63952 +pkg debug/elf, type DynamicVersionDep struct, Index uint16 #63952 +pkg debug/elf, type DynamicVersionFlag uint16 #63952 +pkg debug/elf, type DynamicVersionNeed struct #63952 +pkg debug/elf, type DynamicVersionNeed struct, Name string #63952 +pkg debug/elf, type DynamicVersionNeed struct, Needs []DynamicVersionDep #63952 +pkg debug/elf, type Symbol struct, HasVersion bool #63952 +pkg debug/elf, type Symbol struct, VersionIndex VersionIndex #63952 +pkg debug/elf, method (VersionIndex) Index() uint16 #63952 +pkg debug/elf, method (VersionIndex) IsHidden() bool #63952 +pkg debug/elf, type VersionIndex uint16 #63952 +pkg encoding, type BinaryAppender interface { AppendBinary } #62384 +pkg encoding, type BinaryAppender interface, AppendBinary([]uint8) ([]uint8, error) #62384 +pkg encoding, type TextAppender interface { AppendText } #62384 +pkg encoding, type TextAppender interface, AppendText([]uint8) ([]uint8, error) #62384 +pkg go/types, method (*Interface) EmbeddedTypes() iter.Seq[Type] #66626 +pkg go/types, method (*Interface) ExplicitMethods() iter.Seq[*Func] #66626 +pkg go/types, method (*Interface) Methods() iter.Seq[*Func] #66626 +pkg go/types, method (*MethodSet) Methods() iter.Seq[*Selection] #66626 +pkg go/types, method (*Named) Methods() iter.Seq[*Func] #66626 +pkg go/types, method (*Scope) Children() iter.Seq[*Scope] #66626 +pkg go/types, method (*Struct) Fields() iter.Seq[*Var] #66626 +pkg go/types, method (*Tuple) Variables() iter.Seq[*Var] #66626 +pkg go/types, method (*TypeList) Types() iter.Seq[Type] #66626 +pkg go/types, method (*TypeParamList) TypeParams() iter.Seq[*TypeParam] #66626 +pkg go/types, method (*Union) Terms() iter.Seq[*Term] #66626 +pkg hash/maphash, func Comparable[$0 comparable](Seed, $0) uint64 #54670 +pkg hash/maphash, func WriteComparable[$0 comparable](*Hash, $0) #54670 +pkg log/slog, method (*LevelVar) AppendText([]uint8) ([]uint8, error) #62384 +pkg log/slog, method (Level) AppendText([]uint8) ([]uint8, error) #62384 +pkg log/slog, var DiscardHandler Handler #62005 +pkg math/big, method (*Float) AppendText([]uint8) ([]uint8, error) #62384 +pkg math/big, method (*Int) AppendText([]uint8) ([]uint8, error) #62384 +pkg math/big, method (*Rat) AppendText([]uint8) ([]uint8, error) #62384 +pkg math/rand/v2, method (*ChaCha8) AppendBinary([]uint8) ([]uint8, error) #62384 +pkg math/rand/v2, method (*PCG) AppendBinary([]uint8) ([]uint8, error) #62384 +pkg net, method (IP) AppendText([]uint8) ([]uint8, error) #62384 +pkg net/http, method (*Protocols) SetHTTP1(bool) #67814 +pkg net/http, method (*Protocols) SetHTTP2(bool) #67814 +pkg net/http, method (*Protocols) SetUnencryptedHTTP2(bool) #67816 +pkg net/http, method (Protocols) HTTP1() bool #67814 +pkg net/http, method (Protocols) HTTP2() bool #67814 +pkg net/http, method (Protocols) String() string #67814 +pkg net/http, method (Protocols) UnencryptedHTTP2() bool #67816 +pkg net/http, type HTTP2Config struct #67813 +pkg net/http, type HTTP2Config struct, CountError func(string) #67813 +pkg net/http, type HTTP2Config struct, MaxConcurrentStreams int #67813 +pkg net/http, type HTTP2Config struct, MaxDecoderHeaderTableSize int #67813 +pkg net/http, type HTTP2Config struct, MaxEncoderHeaderTableSize int #67813 +pkg net/http, type HTTP2Config struct, MaxReadFrameSize int #67813 +pkg net/http, type HTTP2Config struct, MaxReceiveBufferPerConnection int #67813 +pkg net/http, type HTTP2Config struct, MaxReceiveBufferPerStream int #67813 +pkg net/http, type HTTP2Config struct, PermitProhibitedCipherSuites bool #67813 +pkg net/http, type HTTP2Config struct, PingTimeout time.Duration #67813 +pkg net/http, type HTTP2Config struct, SendPingTimeout time.Duration #67813 +pkg net/http, type HTTP2Config struct, WriteByteTimeout time.Duration #67813 +pkg net/http, type Protocols struct #67814 +pkg net/http, type Server struct, HTTP2 *HTTP2Config #67813 +pkg net/http, type Server struct, Protocols *Protocols #67814 +pkg net/http, type Transport struct, HTTP2 *HTTP2Config #67813 +pkg net/http, type Transport struct, Protocols *Protocols #67814 +pkg net/netip, method (Addr) AppendBinary([]uint8) ([]uint8, error) #62384 +pkg net/netip, method (Addr) AppendText([]uint8) ([]uint8, error) #62384 +pkg net/netip, method (AddrPort) AppendBinary([]uint8) ([]uint8, error) #62384 +pkg net/netip, method (AddrPort) AppendText([]uint8) ([]uint8, error) #62384 +pkg net/netip, method (Prefix) AppendBinary([]uint8) ([]uint8, error) #62384 +pkg net/netip, method (Prefix) AppendText([]uint8) ([]uint8, error) #62384 +pkg net/url, method (*URL) AppendBinary([]uint8) ([]uint8, error) #62384 +pkg os, func OpenInRoot(string, string) (*File, error) #67002 +pkg os, func OpenRoot(string) (*Root, error) #67002 +pkg os, method (*Root) Close() error #67002 +pkg os, method (*Root) Create(string) (*File, error) #67002 +pkg os, method (*Root) FS() fs.FS #67002 +pkg os, method (*Root) Lstat(string) (fs.FileInfo, error) #67002 +pkg os, method (*Root) Mkdir(string, fs.FileMode) error #67002 +pkg os, method (*Root) Name() string #67002 +pkg os, method (*Root) Open(string) (*File, error) #67002 +pkg os, method (*Root) OpenFile(string, int, fs.FileMode) (*File, error) #67002 +pkg os, method (*Root) OpenRoot(string) (*Root, error) #67002 +pkg os, method (*Root) Remove(string) error #67002 +pkg os, method (*Root) Stat(string) (fs.FileInfo, error) #67002 +pkg os, type Root struct #67002 +pkg regexp, method (*Regexp) AppendText([]uint8) ([]uint8, error) #62384 +pkg runtime, func AddCleanup[$0 interface{}, $1 interface{}](*$0, func($1), $1) Cleanup #67535 +pkg runtime, func GOROOT //deprecated #51473 +pkg runtime, method (Cleanup) Stop() #67535 +pkg runtime, type Cleanup struct #67535 +pkg strings, func FieldsFuncSeq(string, func(int32) bool) iter.Seq[string] #61901 +pkg strings, func FieldsSeq(string) iter.Seq[string] #61901 +pkg strings, func Lines(string) iter.Seq[string] #61901 +pkg strings, func SplitAfterSeq(string, string) iter.Seq[string] #61901 +pkg strings, func SplitSeq(string, string) iter.Seq[string] #61901 +pkg testing, method (*B) Chdir(string) #62516 +pkg testing, method (*B) Context() context.Context #36532 +pkg testing, method (*B) Loop() bool #61515 +pkg testing, method (*F) Chdir(string) #62516 +pkg testing, method (*F) Context() context.Context #36532 +pkg testing, method (*T) Chdir(string) #62516 +pkg testing, method (*T) Context() context.Context #36532 +pkg testing, type TB interface, Chdir(string) #62516 +pkg testing, type TB interface, Context() context.Context #36532 +pkg time, method (Time) AppendBinary([]uint8) ([]uint8, error) #62384 +pkg time, method (Time) AppendText([]uint8) ([]uint8, error) #62384 +pkg weak, func Make[$0 interface{}](*$0) Pointer[$0] #67552 +pkg weak, method (Pointer[$0]) Value() *$0 #67552 +pkg weak, type Pointer[$0 interface{}] struct #67552 diff --git a/codereview.cfg b/codereview.cfg index 3cf4bb2d..e97659c8 100644 --- a/codereview.cfg +++ b/codereview.cfg @@ -1,2 +1,2 @@ -branch: release-branch.go1.23 +branch: release-branch.go1.24 parent-branch: master diff --git a/doc/README.md b/doc/README.md index b0d99456..b7aefc8d 100644 --- a/doc/README.md +++ b/doc/README.md @@ -70,6 +70,6 @@ To begin the next release development cycle, populate the contents of `next` with those of `initial`. From the repo root: > cd doc - > cp -r initial/* next + > cp -R initial/ next Then edit `next/1-intro.md` to refer to the next version. diff --git a/doc/go1.17_spec.html b/doc/go1.17_spec.html index 9f408bcc..dbff3598 100644 --- a/doc/go1.17_spec.html +++ b/doc/go1.17_spec.html @@ -1,6 +1,6 @@ diff --git a/doc/go_mem.html b/doc/go_mem.html index c0b81d3f..633d35cd 100644 --- a/doc/go_mem.html +++ b/doc/go_mem.html @@ -82,7 +82,7 @@ while still insisting that races are errors and that tools can diagnose and repo

The following formal definition of Go's memory model closely follows the approach presented by Hans-J. Boehm and Sarita V. Adve in -“Foundations of the C++ Concurrency Memory Model”, +“Foundations of the C++ Concurrency Memory Model”, published in PLDI 2008. The definition of data-race-free programs and the guarantee of sequential consistency for race-free programs are equivalent to the ones in that work. diff --git a/doc/go_spec.html b/doc/go_spec.html index b5b7f15b..db5fba45 100644 --- a/doc/go_spec.html +++ b/doc/go_spec.html @@ -1,6 +1,6 @@ @@ -798,7 +798,6 @@ If a variable has not yet been assigned a value, its value is the zero value for its type.

-

Types

@@ -810,12 +809,12 @@ from existing types. 

-Type      = TypeName [ TypeArgs ] | TypeLit | "(" Type ")" .
-TypeName  = identifier | QualifiedIdent .
-TypeArgs  = "[" TypeList [ "," ] "]" .
-TypeList  = Type { "," Type } .
-TypeLit   = ArrayType | StructType | PointerType | FunctionType | InterfaceType |
-            SliceType | MapType | ChannelType .
+Type     = TypeName [ TypeArgs ] | TypeLit | "(" Type ")" .
+TypeName = identifier | QualifiedIdent .
+TypeArgs = "[" TypeList [ "," ] "]" .
+TypeList = Type { "," Type } .
+TypeLit  = ArrayType | StructType | PointerType | FunctionType | InterfaceType |
+           SliceType | MapType | ChannelType .

@@ -1086,7 +1085,7 @@ A field declared with a type but no explicit field name is called an embedded An embedded field must be specified as a type name T or as a pointer to a non-interface type name *T, and T itself may not be -a pointer type. The unqualified type name acts as the field name. +a pointer type or type parameter. The unqualified type name acts as the field name. 

@@ -1127,7 +1126,7 @@ of a struct except that they cannot be used as field names in
 

 
 

-Given a struct type S and a named type
+Given a struct type S and a type name
 T, promoted methods are included in the method set of the struct as follows:
 

 
    
@@ -1200,7 +1199,7 @@ type (
 
    
 A pointer type denotes the set of all pointers to variables of a given
 type, called the base type of the pointer.
-The value of an uninitialized pointer is nil.
+The value of an uninitialized pointer is nil.
 
    
 
 
    @@ -1216,18 +1215,18 @@ BaseType    = Type .
 
    Function types
    
 
 
    
-A function type denotes the set of all functions with the same parameter
-and result types. The value of an uninitialized variable of function type
-is nil.
+A function type denotes the set of all functions with the same parameter and result types.
+The value of an uninitialized variable of function
+type is nil.
 
    
 
 
    -FunctionType   = "func" Signature .
-Signature      = Parameters [ Result ] .
-Result         = Parameters | Type .
-Parameters     = "(" [ ParameterList [ "," ] ] ")" .
-ParameterList  = ParameterDecl { "," ParameterDecl } .
-ParameterDecl  = [ IdentifierList ] [ "..." ] Type .
+FunctionType  = "func" Signature .
+Signature     = Parameters [ Result ] .
+Result        = Parameters | Type .
+Parameters    = "(" [ ParameterList [ "," ] ] ")" .
+ParameterList = ParameterDecl { "," ParameterDecl } .
+ParameterDecl = [ IdentifierList ] [ "..." ] Type .
 
    
 
 
    
@@ -1267,7 +1266,8 @@ An interface type defines a type set.
 A variable of interface type can store a value of any type that is in the type
 set of the interface. Such a type is said to
 implement the interface.
-The value of an uninitialized variable of interface type is nil.
+The value of an uninitialized variable of
+interface type is nil.
 
    
 
 
    @@ -1630,12 +1630,12 @@ implements the interface.
 A map is an unordered group of elements of one type, called the
 element type, indexed by a set of unique keys of another type,
 called the key type.
-The value of an uninitialized map is nil.
+The value of an uninitialized map is nil.
 
    
 
 
    -MapType     = "map" "[" KeyType "]" ElementType .
-KeyType     = Type .
+MapType = "map" "[" KeyType "]" ElementType .
+KeyType = Type .
 
    
 
 
    
@@ -1693,7 +1693,7 @@ to communicate by
 sending and
 receiving
 values of a specified element type.
-The value of an uninitialized channel is nil.
+The value of an uninitialized channel is nil.
 
    
 
 
    @@ -1772,6 +1772,57 @@ received in the order sent.
 
 
    Properties of types and values
    
 
+
    Representation of values
    
+
+
    
+Values of predeclared types (see below for the interfaces any
+and error), arrays, and structs are self-contained:
+Each such value contains a complete copy of all its data,
+and variables of such types store the entire value.
+For instance, an array variable provides the storage (the variables)
+for all elements of the array.
+The respective zero values are specific to the
+value's types; they are never nil.
+
    
+
+
    
+Non-nil pointer, function, slice, map, and channel values contain references
+to underlying data which may be shared by multiple values:
+
    
+
+
      
+
    • 
+	A pointer value is a reference to the variable holding
+	the pointer base type value.
+
      • 
+
    • 
+	A function value contains references to the (possibly
+	anonymous) function
+	and enclosed variables.
+
      • 
+
    • 
+	A slice value contains the slice length, capacity, and
+	a reference to its underlying array.
+
      • 
+
    • 
+	A map or channel value is a reference to the implementation-specific
+	data structure of the map or channel.
+
      • 
+
    
+
+
    
+An interface value may be self-contained or contain references to underlying data
+depending on the interface's dynamic type.
+The predeclared identifier nil is the zero value for types whose values
+can contain references.
+
    
+
+
    
+When multiple values share underlying data, changing one value may change another.
+For instance, changing an element of a slice will change
+that element in the underlying array for all slices that share the array.
+
    
+
 
    Underlying types
    
 
 
    
@@ -1927,8 +1978,8 @@ components have identical types. In detail:
 	
  • Two slice types are identical if they have identical element types.
    • 
 
 	
  • Two struct types are identical if they have the same sequence of fields,
-	    and if corresponding fields have the same names, and identical types,
-	    and identical tags.
+	    and if corresponding pairs of fields have the same names, identical types,
+	    and identical tags, and are either both embedded or both not embedded.
 	    Non-exported field names from different
 	    packages are always different.
    • 
 
@@ -2176,7 +2227,7 @@ within matching brace brackets.
 
    
 
 
    -Block = "{" StatementList "}" .
+Block         = "{" StatementList "}" .
 StatementList = { Statement ";" } .
 
    
 
@@ -2233,8 +2284,8 @@ and like the blank identifier it does not introduce a new binding.
 
    
 
 
    -Declaration   = ConstDecl | TypeDecl | VarDecl .
-TopLevelDecl  = Declaration | FunctionDecl | MethodDecl .
+Declaration  = ConstDecl | TypeDecl | VarDecl .
+TopLevelDecl = Declaration | FunctionDecl | MethodDecl .
 
    
 
 
    
@@ -2511,12 +2562,12 @@ An alias declaration binds an identifier to the given type
 
    
 
 
    -AliasDecl = identifier "=" Type .
+AliasDecl = identifier [ TypeParameters ] "=" Type .
 
    
 
 
    
 Within the scope of
-the identifier, it serves as an alias for the type.
+the identifier, it serves as an alias for the given type.
 
    
 
 
    @@ -2526,6 +2577,24 @@ type (
 )
 
    
 
+
    
+If the alias declaration specifies type parameters
+[Go 1.24], the type name denotes a generic alias.
+Generic aliases must be instantiated when they
+are used.
+
    
+
+
    +type set[P comparable] = map[P]bool
+
    
+
+
    
+In an alias declaration the given type cannot be a type parameter.
+
    
+
+
    +type A[P any] = P    // illegal: P is a type parameter
+
    
 
 
    Type definitions
    
 
@@ -2661,9 +2730,9 @@ in square brackets rather than parentheses
 
    
 
 
    -TypeParameters  = "[" TypeParamList [ "," ] "]" .
-TypeParamList   = TypeParamDecl { "," TypeParamDecl } .
-TypeParamDecl   = IdentifierList TypeConstraint .
+TypeParameters = "[" TypeParamList [ "," ] "]" .
+TypeParamList  = TypeParamDecl { "," TypeParamDecl } .
+TypeParamDecl  = IdentifierList TypeConstraint .
 
    
 
 
    
@@ -2801,7 +2870,7 @@ values or variables, or components of other, non-interface types.
 
 
    
 A type argument T satisfies a type constraint C
-if T is an element of the type set defined by C; i.e.,
+if T is an element of the type set defined by C; in other words,
 if T implements C.
 As an exception, a strictly comparable
 type constraint may also be satisfied by a comparable
@@ -2851,8 +2920,8 @@ binds corresponding identifiers to them, and gives each a type and an initial va
 
    
 
 
    -VarDecl     = "var" ( VarSpec | "(" { VarSpec ";" } ")" ) .
-VarSpec     = IdentifierList ( Type [ "=" ExpressionList ] | "=" ExpressionList ) .
+VarDecl = "var" ( VarSpec | "(" { VarSpec ";" } ")" ) .
+VarSpec = IdentifierList ( Type [ "=" ExpressionList ] | "=" ExpressionList ) .
 
    
 
 
    @@ -2881,7 +2950,7 @@ initialization value in the assignment.
 If that value is an untyped constant, it is first implicitly
 converted to its default type;
 if it is an untyped boolean value, it is first implicitly converted to type bool.
-The predeclared value nil cannot be used to initialize a variable
+The predeclared identifier nil cannot be used to initialize a variable
 with no explicit type.
 
    
 
@@ -3075,7 +3144,7 @@ to the base type Point.
 
    
 
 
    
-If the receiver base type is a generic type, the
+If the receiver base type is a generic type, the
 receiver specification must declare corresponding type parameters for the method
 to use. This makes the receiver type parameters available to the method.
 Syntactically, this type parameter declaration looks like an
@@ -3099,6 +3168,22 @@ func (p Pair[A, B]) Swap() Pair[B, A]  { … }  // receiver declares A, B
 func (p Pair[First, _]) First() First  { … }  // receiver declares First, corresponds to A in Pair
 
    
 
+
    
+If the receiver type is denoted by (a pointer to) an alias,
+the alias must not be generic and it must not denote an instantiated generic type, neither
+directly nor indirectly via another alias, and irrespective of pointer indirections.
+
    
+
+
    +type GPoint[P any] = Point
+type HPoint        = *GPoint[int]
+type IPair         = Pair[int, int]
+
+func (*GPoint[P]) Draw(P)   { … }  // illegal: alias must not be generic
+func (HPoint) Draw(P)       { … }  // illegal: alias must not denote instantiated type GPoint[int]
+func (*IPair) Second() int  { … }  // illegal: alias must not denote instantiated type Pair[int, int]
+
    
+
 
    Expressions
    
 
 
    
@@ -3176,15 +3261,15 @@ Each element may optionally be preceded by a corresponding key.
 
    
 
 
    -CompositeLit  = LiteralType LiteralValue .
-LiteralType   = StructType | ArrayType | "[" "..." "]" ElementType |
-                SliceType | MapType | TypeName [ TypeArgs ] .
-LiteralValue  = "{" [ ElementList [ "," ] ] "}" .
-ElementList   = KeyedElement { "," KeyedElement } .
-KeyedElement  = [ Key ":" ] Element .
-Key           = FieldName | Expression | LiteralValue .
-FieldName     = identifier .
-Element       = Expression | LiteralValue .
+CompositeLit = LiteralType LiteralValue .
+LiteralType  = StructType | ArrayType | "[" "..." "]" ElementType |
+               SliceType | MapType | TypeName [ TypeArgs ] .
+LiteralValue = "{" [ ElementList [ "," ] ] "}" .
+ElementList  = KeyedElement { "," KeyedElement } .
+KeyedElement = [ Key ":" ] Element .
+Key          = FieldName | Expression | LiteralValue .
+FieldName    = identifier .
+Element      = Expression | LiteralValue .
 
    
 
 
    
@@ -3416,22 +3501,21 @@ Primary expressions are the operands for unary and binary expressions.
 
    
 
 
    -PrimaryExpr =
-	Operand |
-	Conversion |
-	MethodExpr |
-	PrimaryExpr Selector |
-	PrimaryExpr Index |
-	PrimaryExpr Slice |
-	PrimaryExpr TypeAssertion |
-	PrimaryExpr Arguments .
+PrimaryExpr   = Operand |
+                Conversion |
+                MethodExpr |
+                PrimaryExpr Selector |
+                PrimaryExpr Index |
+                PrimaryExpr Slice |
+                PrimaryExpr TypeAssertion |
+                PrimaryExpr Arguments .
 
-Selector       = "." identifier .
-Index          = "[" Expression [ "," ] "]" .
-Slice          = "[" [ Expression ] ":" [ Expression ] "]" |
-                 "[" [ Expression ] ":" Expression ":" Expression "]" .
-TypeAssertion  = "." "(" Type ")" .
-Arguments      = "(" [ ( ExpressionList | Type [ "," ExpressionList ] ) [ "..." ] [ "," ] ] ")" .
+Selector      = "." identifier .
+Index         = "[" Expression [ "," ] "]" .
+Slice         = "[" [ Expression ] ":" [ Expression ] "]" |
+                "[" [ Expression ] ":" Expression ":" Expression "]" .
+TypeAssertion = "." "(" Type ")" .
+Arguments     = "(" [ ( ExpressionList | Type [ "," ExpressionList ] ) [ "..." ] [ "," ] ] ")" .
 
    
 
 
@@ -3604,8 +3688,8 @@ argument that is the receiver of the method.
 
    
 
 
    -MethodExpr    = ReceiverType "." MethodName .
-ReceiverType  = Type .
+MethodExpr   = ReceiverType "." MethodName .
+ReceiverType = Type .
 
    
 
 
    
@@ -4196,8 +4280,7 @@ calls f with arguments a1, a2, … an.
 Except for one special case, arguments must be single-valued expressions
 assignable to the parameter types of
 F and are evaluated before the function is called.
-The type of the expression is the result type
-of F.
+The type of the expression is the result type of F.
 A method invocation is similar but the method itself
 is specified as a selector upon a value of the receiver type for
 the method.
@@ -4218,9 +4301,14 @@ or used as a function value.
 
    
 In a function call, the function value and arguments are evaluated in
 the usual order.
-After they are evaluated, the parameters of the call are passed by value to the function
+After they are evaluated, new storage is allocated for the function's
+variables, which includes its parameters
+and results.
+Then, the arguments of the call are passed to the function,
+which means that they are assigned
+to their corresponding function parameters,
 and the called function begins execution.
-The return parameters of the function are passed by value
+The return parameters of the function are passed
 back to the caller when the function returns.
 
    
 
@@ -4234,9 +4322,9 @@ As a special case, if the return values of a function or method
 g are equal in number and individually
 assignable to the parameters of another function or method
 f, then the call f(g(parameters_of_g))
-will invoke f after binding the return values of
-g to the parameters of f in order.  The call
-of f must contain no parameters other than the call of g,
+will invoke f after passing the return values of
+g to the parameters of f in order.
+The call of f must contain no parameters other than the call of g,
 and g must have at least one return value.
 If f has a final ... parameter, it is
 assigned the return values of g that remain after
@@ -4282,7 +4370,7 @@ If f is variadic with a final
 parameter p of type ...T, then within f
 the type of p is equivalent to type []T.
 If f is invoked with no actual arguments for p,
-the value passed to p is nil.
+the value passed to p is nil.
 Otherwise, the value passed is a new slice
 of type []T with a new underlying array whose successive elements
 are the actual arguments, which all must be assignable
@@ -5598,6 +5686,8 @@ myString([]myRune{0x1f30e})              // "\U0001f30e" == "🌎"
 
  • 
 Converting a value of a string type to a slice of bytes type
 yields a non-nil slice whose successive elements are the bytes of the string.
+The capacity of the resulting slice is
+implementation-specific and may be larger than the slice length.
 
 
     []byte("hellø")             // []byte{'h', 'e', 'l', 'l', '\xc3', '\xb8'}
@@ -5613,6 +5703,8 @@ bytes("hellø")              // []byte{'h', 'e', 'l', 'l', '\xc3', '\xb8'}
 
  • 
 Converting a value of a string type to a slice of runes type
 yields a slice containing the individual Unicode code points of the string.
+The capacity of the resulting slice is
+implementation-specific and may be larger than the slice length.
 
 
     []rune(myString("白鵬翔"))   // []rune{0x767d, 0x9d6c, 0x7fd4}
@@ -5814,7 +5906,7 @@ Otherwise, when evaluating the operands of an
 expression, assignment, or
 return statement,
 all function calls, method calls,
-receive operations,
+receive operations,
 and binary logical operations
 are evaluated in lexical left-to-right order.
 
    
@@ -5882,11 +5974,10 @@ Statements control execution.
 
    
 
 
    -Statement =
-	Declaration | LabeledStmt | SimpleStmt |
-	GoStmt | ReturnStmt | BreakStmt | ContinueStmt | GotoStmt |
-	FallthroughStmt | Block | IfStmt | SwitchStmt | SelectStmt | ForStmt |
-	DeferStmt .
+Statement  = Declaration | LabeledStmt | SimpleStmt |
+             GoStmt | ReturnStmt | BreakStmt | ContinueStmt | GotoStmt |
+             FallthroughStmt | Block | IfStmt | SwitchStmt | SelectStmt | ForStmt |
+             DeferStmt .
 
 SimpleStmt = EmptyStmt | ExpressionStmt | SendStmt | IncDecStmt | Assignment | ShortVarDecl .
 
    
@@ -6098,7 +6189,7 @@ matching number of variables.
 
     Assignment = ExpressionList assign_op ExpressionList .
 
-assign_op = [ add_op | mul_op ] "=" .
+assign_op  = [ add_op | mul_op ] "=" .
 
    
 
 
    
@@ -6227,6 +6318,26 @@ to the type of the operand to which it is assigned, with the following special c
 
    • 
 
 
+
    
+When a value is assigned to a variable, only the data that is stored in the variable
+is replaced. If the value contains a reference,
+the assignment copies the reference but does not make a copy of the referenced data
+(such as the underlying array of a slice).
+
    
+
+
    +var s1 = []int{1, 2, 3}
+var s2 = s1                    // s2 stores the slice descriptor of s1
+s1 = s1[:1]                    // s1's length is 1 but it still shares its underlying array with s2
+s2[0] = 42                     // setting s2[0] changes s1[0] as well
+fmt.Println(s1, s2)            // prints [42] [42 2 3]
+
+var m1 = make(map[string]int)
+var m2 = m1                    // m2 stores the map descriptor of m1
+m1["foo"] = 42                 // setting m1["foo"] changes m2["foo"] as well
+fmt.Println(m2["foo"])         // prints 42
+
    
+
 
    If statements
    
 
 
    
@@ -6514,7 +6625,7 @@ The iteration may be controlled by a single condition, a "for" clause, or a "ran
 
    
 
 
    -ForStmt = "for" [ Condition | ForClause | RangeClause ] Block .
+ForStmt   = "for" [ Condition | ForClause | RangeClause ] Block .
 Condition = Expression .
 
    
 
@@ -6546,8 +6657,8 @@ an increment or decrement statement. The init statement may be a
 
 
     ForClause = [ InitStmt ] ";" [ Condition ] ";" [ PostStmt ] .
-InitStmt = SimpleStmt .
-PostStmt = SimpleStmt .
+InitStmt  = SimpleStmt .
+PostStmt  = SimpleStmt .
 
    
 
 
    @@ -7875,7 +7986,7 @@ types, variables, and constants.
 
    
 
 
    -SourceFile       = PackageClause ";" { ImportDecl ";" } { TopLevelDecl ";" } .
+SourceFile = PackageClause ";" { ImportDecl ";" } { TopLevelDecl ";" } .
 
    
 
 
    Package clause
    
@@ -7886,8 +7997,8 @@ to which the file belongs.
 
    
 
 
    -PackageClause  = "package" PackageName .
-PackageName    = identifier .
+PackageClause = "package" PackageName .
+PackageName   = identifier .
 
    
 
 
    
@@ -7916,9 +8027,9 @@ that specifies the package to be imported.
 
    
 
 
    -ImportDecl       = "import" ( ImportSpec | "(" { ImportSpec ";" } ")" ) .
-ImportSpec       = [ "." | PackageName ] ImportPath .
-ImportPath       = string_lit .
+ImportDecl = "import" ( ImportSpec | "(" { ImportSpec ";" } ")" ) .
+ImportSpec = [ "." | PackageName ] ImportPath .
+ImportPath = string_lit .
 
    
 
 
    
@@ -8403,7 +8514,7 @@ var p ptr = nil
 
    
 The functions Alignof and Sizeof take an expression x
 of any type and return the alignment or size, respectively, of a hypothetical variable v
-as if v was declared via var v = x.
+as if v were declared via var v = x.
 
    
 
    
 The function Offsetof takes a (possibly parenthesized) selector
@@ -8687,6 +8798,15 @@ integer values from zero to an upper limit.
 function as range expression.
 
    • 
 

+
+
Go 1.24

+
+
 
Type unification rules

 
 

diff --git a/doc/godebug.md b/doc/godebug.md
index b3a43664..1b5674f2 100644
--- a/doc/godebug.md
+++ b/doc/godebug.md
@@ -34,6 +34,7 @@ For example, if a Go program is running in an environment that contains
 
 then that Go program will disable the use of HTTP/2 by default in both
 the HTTP client and the HTTP server.
+Unrecognized settings in the `GODEBUG` environment variable are ignored.
 It is also possible to set the default `GODEBUG` for a given program
 (discussed below).
 
@@ -150,6 +151,68 @@ for example,
 see the [runtime documentation](/pkg/runtime#hdr-Environment_Variables)
 and the [go command documentation](/cmd/go#hdr-Build_and_test_caching).
 
+### Go 1.24
+
+Go 1.24 changed the global [`math/rand.Seed`](/pkg/math/rand/#Seed) to be a
+no-op. This behavior is controlled by the `randseednop` setting.
+For Go 1.24 it defaults to `randseednop=1`.
+Using `randseednop=0` reverts to the pre-Go 1.24 behavior.
+
+Go 1.24 added new values for the `multipathtcp` setting.
+The possible values for `multipathtcp` are now:
+- "0": disable MPTCP on dialers and listeners by default
+- "1": enable MPTCP on dialers and listeners by default
+- "2": enable MPTCP on listeners only by default
+- "3": enable MPTCP on dialers only by default
+
+For Go 1.24, it now defaults to multipathtcp="2", thus
+enabled by default on listeners. Using multipathtcp="0" reverts to the
+pre-Go 1.24 behavior.
+
+Go 1.24 changed the behavior of `go test -json` to emit build errors as JSON
+instead of text.
+These new JSON events are distinguished by new `Action` values,
+but can still cause problems with CI systems that aren't robust to these events.
+This behavior can be controlled with the `gotestjsonbuildtext` setting.
+Using `gotestjsonbuildtext=1` restores the 1.23 behavior.
+This setting will be removed in a future release, Go 1.28 at the earliest.
+
+Go 1.24 changed [`crypto/rsa`](/pkg/crypto/rsa) to require RSA keys to be at
+least 1024 bits. This behavior can be controlled with the `rsa1024min` setting.
+Using `rsa1024min=0` restores the Go 1.23 behavior.
+
+Go 1.24 introduced a mechanism for enabling platform specific Data Independent
+Timing (DIT) modes in the [`crypto/subtle`](/pkg/crypto/subtle) package. This
+mode can be enabled for an entire program with the `dataindependenttiming` setting.
+For Go 1.24 it defaults to `dataindependenttiming=0`. There is no change in default
+behavior from Go 1.23 when `dataindependenttiming` is unset.
+Using `dataindependenttiming=1` enables the DIT mode for the entire Go program.
+When enabled, DIT will be enabled when calling into C from Go. When enabled,
+calling into Go code from C will enable DIT, and disable it before returning to
+C if it was not enabled when Go code was entered.
+This currently only affects arm64 programs. For all other platforms it is a no-op.
+
+Go 1.24 removed the `x509sha1` setting.  `crypto/x509` no longer supports verifying
+signatures on certificates that use SHA-1 based signature algorithms.
+
+Go 1.24 changes the default value of the [`x509usepolicies`
+setting.](/pkg/crypto/x509/#CreateCertificate) from `0` to `1`. When marshalling
+certificates, policies are now taken from the
+[`Certificate.Policies`](/pkg/crypto/x509/#Certificate.Policies) field rather
+than the
+[`Certificate.PolicyIdentifiers`](/pkg/crypto/x509/#Certificate.PolicyIdentifiers)
+field by default.
+
+Go 1.24 enabled the post-quantum key exchange mechanism
+X25519MLKEM768 by default. The default can be reverted using the
+[`tlsmlkem` setting](/pkg/crypto/tls/#Config.CurvePreferences).
+Go 1.24 also removed X25519Kyber768Draft00 and the Go 1.23 `tlskyber` setting.
+
+Go 1.24 made [`ParsePKCS1PrivateKey`](/pkg/crypto/x509/#ParsePKCS1PrivateKey)
+use and validate the CRT parameters in the encoded private key. This behavior
+can be controlled with the `x509rsacrt` setting. Using `x509rsacrt=0` restores
+the Go 1.23 behavior.
+
 ### Go 1.23
 
 Go 1.23 changed the channels created by package time to be unbuffered
@@ -342,7 +405,7 @@ There is no plan to remove this setting.
 
 Go 1.18 removed support for SHA1 in most X.509 certificates,
 controlled by the [`x509sha1` setting](/pkg/crypto/x509#InsecureAlgorithmError).
-This setting will be removed in a future release, Go 1.22 at the earliest.
+This setting was removed in Go 1.24.
 
 ### Go 1.10
 
diff --git a/doc/initial/1-intro.md b/doc/initial/1-intro.md
index 8c9948dd..84ffee85 100644
--- a/doc/initial/1-intro.md
+++ b/doc/initial/1-intro.md
@@ -1,9 +1,3 @@
-
-
 
diff --git a/lib/fips140/Makefile b/lib/fips140/Makefile
new file mode 100644
index 00000000..8dcb8fbe
--- /dev/null
+++ b/lib/fips140/Makefile
@@ -0,0 +1,46 @@
+# Copyright 2024 The Go Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file.
+
+# Rules for building and testing new FIPS snapshots.
+# For example:
+#
+#	make v1.2.3.zip
+#	make v1.2.3.test
+#
+# and then if changes are needed, check them into master
+# and run 'make v1.2.3.rm' and repeat.
+#
+# Note that once published a snapshot zip file should never
+# be modified. We record the sha256 hashes of the zip files
+# in fips140.sum, and the cmd/go/internal/fips140 test checks
+# that the zips match.
+#
+# When the zip file is finalized, run 'make updatesum' to update
+# fips140.sum.
+
+default:
+	@echo nothing to make
+
+# make v1.2.3.zip builds a v1.2.3.zip file
+# from the current origin/master.
+# copy and edit the 'go run' command by hand to use a different branch.
+v%.zip:
+	git fetch origin master
+	go run ../../src/cmd/go/internal/fips140/mkzip.go v$*
+
+# normally mkzip refuses to overwrite an existing zip file.
+# make v1.2.3.rm removes the zip file and and unpacked
+# copy from the module cache.
+v%.rm:
+	rm -f v$*.zip
+	chmod -R u+w $$(go env GOMODCACHE)/golang.org/fips140@v$* 2>/dev/null || true
+	rm -rf $$(go env GOMODCACHE)/golang.org/fips140@v$*
+
+# make v1.2.3.test runs the crypto tests using that snapshot.
+v%.test:
+	GOFIPS140=v$* go test -short crypto...
+
+# make updatesum updates the fips140.sum file.
+updatesum:
+	go test cmd/go/internal/fips140 -update
diff --git a/lib/fips140/README.md b/lib/fips140/README.md
new file mode 100644
index 00000000..38ca130d
--- /dev/null
+++ b/lib/fips140/README.md
@@ -0,0 +1,9 @@
+This directory holds snapshots of the crypto/internal/fips140 tree
+that are being validated and certified for FIPS-140 use.
+The file x.txt (for example, inprocess.txt, certified.txt)
+defines the meaning of the FIPS version alias x, listing
+the exact version to use.
+
+The zip files are created by cmd/go/internal/fips140/mkzip.go.
+The fips140.sum file lists checksums for the zip files.
+See the Makefile for recipes.
diff --git a/lib/fips140/fips140.sum b/lib/fips140/fips140.sum
new file mode 100644
index 00000000..66b1e23d
--- /dev/null
+++ b/lib/fips140/fips140.sum
@@ -0,0 +1,12 @@
+# SHA256 checksums of snapshot zip files in this directory.
+# These checksums are included in the FIPS security policy
+# (validation instructions sent to the lab) and MUST NOT CHANGE.
+# That is, the zip files themselves must not change.
+#
+# It is okay to add new zip files to the list, and it is okay to
+# remove zip files from the list when they are removed from
+# this directory. To update this file:
+#
+#	go test cmd/go/internal/fips140 -update
+#
+v1.0.0.zip b50508feaeff05d22516b21e1fd210bbf5d6a1e422eaf2cfa23fe379342713b8
diff --git a/lib/fips140/v1.0.0.zip b/lib/fips140/v1.0.0.zip
new file mode 100644
index 0000000000000000000000000000000000000000..bd9d3c19d05b9075a2587806d00224c3f8859ba1
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h {
+				this._inst.exports.testExport0();
+				return this._inst.exports.testExport(a, b);
+			}
+
 			const timeOrigin = Date.now() - performance.now();
 			this.importObject = {
 				_gotest: {
 					add: (a, b) => a + b,
+					callExport: testCallExport,
 				},
 				gojs: {
 					// Go's SP does not change as long as no Go code is running. Some operations (e.g. calls, getters and setters)
diff --git a/misc/wasm/wasm_exec_node.js b/lib/wasm/wasm_exec_node.js
similarity index 97%
rename from misc/wasm/wasm_exec_node.js
rename to lib/wasm/wasm_exec_node.js
index 98606908..dd65b198 100644
--- a/misc/wasm/wasm_exec_node.js
+++ b/lib/wasm/wasm_exec_node.js
@@ -11,6 +11,7 @@ if (process.argv.length < 3) {
 
 globalThis.require = require;
 globalThis.fs = require("fs");
+globalThis.path = require("path");
 globalThis.TextEncoder = require("util").TextEncoder;
 globalThis.TextDecoder = require("util").TextDecoder;
 
diff --git a/misc/wasm/wasm_exec.html b/misc/wasm/wasm_exec.html
index 72e64473..694b526d 100644
--- a/misc/wasm/wasm_exec.html
+++ b/misc/wasm/wasm_exec.html
@@ -17,7 +17,7 @@ license that can be found in the LICENSE file.
 	
 	(see https://caniuse.com/#feat=textencoder)
 	-->
-	
+	
 	= min(r0.Max.X, s0.Max.X) || likewiseForY { etc }
 	if r.Empty() {
-		return ZR
+		return Rectangle{}
 	}
 	return r
 }
diff --git a/src/image/gif/writer.go b/src/image/gif/writer.go
index 0d2a1321..129d0ab2 100644
--- a/src/image/gif/writer.go
+++ b/src/image/gif/writer.go
@@ -146,8 +146,8 @@ func (e *encoder) writeHeader() {
 	}
 
 	// Logical screen width and height.
-	byteorder.LePutUint16(e.buf[0:2], uint16(e.g.Config.Width))
-	byteorder.LePutUint16(e.buf[2:4], uint16(e.g.Config.Height))
+	byteorder.LEPutUint16(e.buf[0:2], uint16(e.g.Config.Width))
+	byteorder.LEPutUint16(e.buf[2:4], uint16(e.g.Config.Height))
 	e.write(e.buf[:4])
 
 	if p, ok := e.g.Config.ColorModel.(color.Palette); ok && len(p) > 0 {
@@ -185,7 +185,7 @@ func (e *encoder) writeHeader() {
 		}
 		e.buf[0] = 0x03 // Block Size.
 		e.buf[1] = 0x01 // Sub-block Index.
-		byteorder.LePutUint16(e.buf[2:4], uint16(e.g.LoopCount))
+		byteorder.LEPutUint16(e.buf[2:4], uint16(e.g.LoopCount))
 		e.buf[4] = 0x00 // Block Terminator.
 		e.write(e.buf[:5])
 	}
@@ -271,7 +271,7 @@ func (e *encoder) writeImageBlock(pm *image.Paletted, delay int, disposal byte)
 		} else {
 			e.buf[3] = 0x00 | disposal<<2
 		}
-		byteorder.LePutUint16(e.buf[4:6], uint16(delay)) // Delay Time (1/100ths of a second)
+		byteorder.LEPutUint16(e.buf[4:6], uint16(delay)) // Delay Time (1/100ths of a second)
 
 		// Transparent color index.
 		if transparentIndex != -1 {
@@ -283,10 +283,10 @@ func (e *encoder) writeImageBlock(pm *image.Paletted, delay int, disposal byte)
 		e.write(e.buf[:8])
 	}
 	e.buf[0] = sImageDescriptor
-	byteorder.LePutUint16(e.buf[1:3], uint16(b.Min.X))
-	byteorder.LePutUint16(e.buf[3:5], uint16(b.Min.Y))
-	byteorder.LePutUint16(e.buf[5:7], uint16(b.Dx()))
-	byteorder.LePutUint16(e.buf[7:9], uint16(b.Dy()))
+	byteorder.LEPutUint16(e.buf[1:3], uint16(b.Min.X))
+	byteorder.LEPutUint16(e.buf[3:5], uint16(b.Min.Y))
+	byteorder.LEPutUint16(e.buf[5:7], uint16(b.Dx()))
+	byteorder.LEPutUint16(e.buf[7:9], uint16(b.Dy()))
 	e.write(e.buf[:9])
 
 	// To determine whether or not this frame's palette is the same as the
diff --git a/src/image/jpeg/dct_test.go b/src/image/jpeg/dct_test.go
index ed5b73d5..11819db8 100644
--- a/src/image/jpeg/dct_test.go
+++ b/src/image/jpeg/dct_test.go
@@ -112,12 +112,42 @@ func alpha(i int) float64 {
 	return math.Sqrt2
 }
 
-var cosines [32]float64 // cosines[k] = cos(π/2 * k/8)
+var cosines = [32]float64{
+	+1.0000000000000000000000000000000000000000000000000000000000000000, // cos(π/16 *  0)
+	+0.9807852804032304491261822361342390369739337308933360950029160885, // cos(π/16 *  1)
+	+0.9238795325112867561281831893967882868224166258636424861150977312, // cos(π/16 *  2)
+	+0.8314696123025452370787883776179057567385608119872499634461245902, // cos(π/16 *  3)
+	+0.7071067811865475244008443621048490392848359376884740365883398689, // cos(π/16 *  4)
+	+0.5555702330196022247428308139485328743749371907548040459241535282, // cos(π/16 *  5)
+	+0.3826834323650897717284599840303988667613445624856270414338006356, // cos(π/16 *  6)
+	+0.1950903220161282678482848684770222409276916177519548077545020894, // cos(π/16 *  7)
 
-func init() {
-	for k := range cosines {
-		cosines[k] = math.Cos(math.Pi * float64(k) / 16)
-	}
+	-0.0000000000000000000000000000000000000000000000000000000000000000, // cos(π/16 *  8)
+	-0.1950903220161282678482848684770222409276916177519548077545020894, // cos(π/16 *  9)
+	-0.3826834323650897717284599840303988667613445624856270414338006356, // cos(π/16 * 10)
+	-0.5555702330196022247428308139485328743749371907548040459241535282, // cos(π/16 * 11)
+	-0.7071067811865475244008443621048490392848359376884740365883398689, // cos(π/16 * 12)
+	-0.8314696123025452370787883776179057567385608119872499634461245902, // cos(π/16 * 13)
+	-0.9238795325112867561281831893967882868224166258636424861150977312, // cos(π/16 * 14)
+	-0.9807852804032304491261822361342390369739337308933360950029160885, // cos(π/16 * 15)
+
+	-1.0000000000000000000000000000000000000000000000000000000000000000, // cos(π/16 * 16)
+	-0.9807852804032304491261822361342390369739337308933360950029160885, // cos(π/16 * 17)
+	-0.9238795325112867561281831893967882868224166258636424861150977312, // cos(π/16 * 18)
+	-0.8314696123025452370787883776179057567385608119872499634461245902, // cos(π/16 * 19)
+	-0.7071067811865475244008443621048490392848359376884740365883398689, // cos(π/16 * 20)
+	-0.5555702330196022247428308139485328743749371907548040459241535282, // cos(π/16 * 21)
+	-0.3826834323650897717284599840303988667613445624856270414338006356, // cos(π/16 * 22)
+	-0.1950903220161282678482848684770222409276916177519548077545020894, // cos(π/16 * 23)
+
+	+0.0000000000000000000000000000000000000000000000000000000000000000, // cos(π/16 * 24)
+	+0.1950903220161282678482848684770222409276916177519548077545020894, // cos(π/16 * 25)
+	+0.3826834323650897717284599840303988667613445624856270414338006356, // cos(π/16 * 26)
+	+0.5555702330196022247428308139485328743749371907548040459241535282, // cos(π/16 * 27)
+	+0.7071067811865475244008443621048490392848359376884740365883398689, // cos(π/16 * 28)
+	+0.8314696123025452370787883776179057567385608119872499634461245902, // cos(π/16 * 29)
+	+0.9238795325112867561281831893967882868224166258636424861150977312, // cos(π/16 * 30)
+	+0.9807852804032304491261822361342390369739337308933360950029160885, // cos(π/16 * 31)
 }
 
 // slowFDCT performs the 8*8 2-dimensional forward discrete cosine transform:
diff --git a/src/image/jpeg/writer.go b/src/image/jpeg/writer.go
index 87c109ab..0bda55c6 100644
--- a/src/image/jpeg/writer.go
+++ b/src/image/jpeg/writer.go
@@ -50,8 +50,8 @@ const (
 
 // unscaledQuant are the unscaled quantization tables in zig-zag order. Each
 // encoder copies and scales the tables according to its quality parameter.
-// The values are derived from section K.1 after converting from natural to
-// zig-zag order.
+// The values are derived from section K.1 of the spec, after converting from
+// natural to zig-zag order.
 var unscaledQuant = [nQuantIndex][blockSize]byte{
 	// Luminance.
 	{
@@ -89,14 +89,22 @@ const (
 
 // huffmanSpec specifies a Huffman encoding.
 type huffmanSpec struct {
-	// count[i] is the number of codes of length i bits.
+	// count[i] is the number of codes of length i+1 bits.
 	count [16]byte
 	// value[i] is the decoded value of the i'th codeword.
 	value []byte
 }
 
 // theHuffmanSpec is the Huffman encoding specifications.
-// This encoder uses the same Huffman encoding for all images.
+//
+// This encoder uses the same Huffman encoding for all images. It is also the
+// same Huffman encoding used by section K.3 of the spec.
+//
+// The DC tables have 12 decoded values, called categories.
+//
+// The AC tables have 162 decoded values: bytes that pack a 4-bit Run and a
+// 4-bit Size. There are 16 valid Runs and 10 valid Sizes, plus two special R|S
+// cases: 0|0 (meaning EOB) and F|0 (meaning ZRL).
 var theHuffmanSpec = [nHuffIndex]huffmanSpec{
 	// Luminance DC.
 	{
diff --git a/src/internal/abi/map.go b/src/internal/abi/map.go
deleted file mode 100644
index 12ad1b89..00000000
--- a/src/internal/abi/map.go
+++ /dev/null
@@ -1,19 +0,0 @@
-// Copyright 2023 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package abi
-
-// Map constants common to several packages
-// runtime/runtime-gdb.py:MapTypePrinter contains its own copy
-const (
-	// Maximum number of key/elem pairs a bucket can hold.
-	MapBucketCountBits = 3 // log2 of number of elements in a bucket.
-	MapBucketCount     = 1 << MapBucketCountBits
-
-	// Maximum key or elem size to keep inline (instead of mallocing per element).
-	// Must fit in a uint8.
-	// Note: fast map functions cannot handle big elems (bigger than MapMaxElemBytes).
-	MapMaxKeyBytes  = 128
-	MapMaxElemBytes = 128 // Must fit in a uint8.
-)
diff --git a/src/internal/abi/map_noswiss.go b/src/internal/abi/map_noswiss.go
new file mode 100644
index 00000000..ff8609ef
--- /dev/null
+++ b/src/internal/abi/map_noswiss.go
@@ -0,0 +1,54 @@
+// Copyright 2023 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package abi
+
+import (
+	"unsafe"
+)
+
+// Map constants common to several packages
+// runtime/runtime-gdb.py:MapTypePrinter contains its own copy
+const (
+	// Maximum number of key/elem pairs a bucket can hold.
+	OldMapBucketCountBits = 3 // log2 of number of elements in a bucket.
+	OldMapBucketCount     = 1 << OldMapBucketCountBits
+
+	// Maximum key or elem size to keep inline (instead of mallocing per element).
+	// Must fit in a uint8.
+	// Note: fast map functions cannot handle big elems (bigger than MapMaxElemBytes).
+	OldMapMaxKeyBytes  = 128
+	OldMapMaxElemBytes = 128 // Must fit in a uint8.
+)
+
+type OldMapType struct {
+	Type
+	Key    *Type
+	Elem   *Type
+	Bucket *Type // internal type representing a hash bucket
+	// function for hashing keys (ptr to key, seed) -> hash
+	Hasher     func(unsafe.Pointer, uintptr) uintptr
+	KeySize    uint8  // size of key slot
+	ValueSize  uint8  // size of elem slot
+	BucketSize uint16 // size of bucket
+	Flags      uint32
+}
+
+// Note: flag values must match those used in the TMAP case
+// in ../cmd/compile/internal/reflectdata/reflect.go:writeType.
+func (mt *OldMapType) IndirectKey() bool { // store ptr to key instead of key itself
+	return mt.Flags&1 != 0
+}
+func (mt *OldMapType) IndirectElem() bool { // store ptr to elem instead of elem itself
+	return mt.Flags&2 != 0
+}
+func (mt *OldMapType) ReflexiveKey() bool { // true if k==k for all keys
+	return mt.Flags&4 != 0
+}
+func (mt *OldMapType) NeedKeyUpdate() bool { // true if we need to update key on an overwrite
+	return mt.Flags&8 != 0
+}
+func (mt *OldMapType) HashMightPanic() bool { // true if hash function might panic
+	return mt.Flags&16 != 0
+}
diff --git a/src/internal/abi/map_select_noswiss.go b/src/internal/abi/map_select_noswiss.go
new file mode 100644
index 00000000..ab2b69de
--- /dev/null
+++ b/src/internal/abi/map_select_noswiss.go
@@ -0,0 +1,10 @@
+// Copyright 2023 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build !goexperiment.swissmap
+
+package abi
+
+// See comment in map_select_swiss.go.
+type mapType = OldMapType
diff --git a/src/internal/abi/map_select_swiss.go b/src/internal/abi/map_select_swiss.go
new file mode 100644
index 00000000..88a0bb2e
--- /dev/null
+++ b/src/internal/abi/map_select_swiss.go
@@ -0,0 +1,22 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build goexperiment.swissmap
+
+package abi
+
+// Select the map type that this binary is built using. This is for common
+// lookup methods like Type.Key to know which type to use.
+//
+// Note that mapType *must not be used by any functions called in the
+// compiler to build a target program* because the compiler must use the map
+// type determined by run-time GOEXPERIMENT, not the build tags used to build
+// the compiler.
+//
+// TODO(prattmic): This package is rather confusing because it has many
+// functions that can't be used by the compiler (e.g., Type.Uncommon depends on
+// the layout of type + uncommon objects in the binary. It would be incorrect
+// for an ad-hoc local Type object). It may be best to move code that isn't
+// usable by the compiler out of the package.
+type mapType = SwissMapType
diff --git a/src/internal/abi/map_swiss.go b/src/internal/abi/map_swiss.go
new file mode 100644
index 00000000..6c855667
--- /dev/null
+++ b/src/internal/abi/map_swiss.go
@@ -0,0 +1,64 @@
+// Copyright 2023 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package abi
+
+import (
+	"unsafe"
+)
+
+// Map constants common to several packages
+// runtime/runtime-gdb.py:MapTypePrinter contains its own copy
+const (
+	// Number of bits in the group.slot count.
+	SwissMapGroupSlotsBits = 3
+
+	// Number of slots in a group.
+	SwissMapGroupSlots = 1 << SwissMapGroupSlotsBits // 8
+
+	// Maximum key or elem size to keep inline (instead of mallocing per element).
+	// Must fit in a uint8.
+	SwissMapMaxKeyBytes  = 128
+	SwissMapMaxElemBytes = 128
+
+	ctrlEmpty = 0b10000000
+	bitsetLSB = 0x0101010101010101
+
+	// Value of control word with all empty slots.
+	SwissMapCtrlEmpty = bitsetLSB * uint64(ctrlEmpty)
+)
+
+type SwissMapType struct {
+	Type
+	Key   *Type
+	Elem  *Type
+	Group *Type // internal type representing a slot group
+	// function for hashing keys (ptr to key, seed) -> hash
+	Hasher    func(unsafe.Pointer, uintptr) uintptr
+	GroupSize uintptr // == Group.Size_
+	SlotSize  uintptr // size of key/elem slot
+	ElemOff   uintptr // offset of elem in key/elem slot
+	Flags     uint32
+}
+
+// Flag values
+const (
+	SwissMapNeedKeyUpdate = 1 << iota
+	SwissMapHashMightPanic
+	SwissMapIndirectKey
+	SwissMapIndirectElem
+)
+
+func (mt *SwissMapType) NeedKeyUpdate() bool { // true if we need to update key on an overwrite
+	return mt.Flags&SwissMapNeedKeyUpdate != 0
+}
+func (mt *SwissMapType) HashMightPanic() bool { // true if hash function might panic
+	return mt.Flags&SwissMapHashMightPanic != 0
+}
+func (mt *SwissMapType) IndirectKey() bool { // store ptr to key instead of key itself
+	return mt.Flags&SwissMapIndirectKey != 0
+}
+func (mt *SwissMapType) IndirectElem() bool { // store ptr to elem instead of elem itself
+	return mt.Flags&SwissMapIndirectElem != 0
+}
diff --git a/src/internal/abi/type.go b/src/internal/abi/type.go
index b8eefe0d..1c1793fc 100644
--- a/src/internal/abi/type.go
+++ b/src/internal/abi/type.go
@@ -29,8 +29,16 @@ type Type struct {
 	// (ptr to object A, ptr to object B) -> ==?
 	Equal func(unsafe.Pointer, unsafe.Pointer) bool
 	// GCData stores the GC type data for the garbage collector.
-	// If the KindGCProg bit is set in kind, GCData is a GC program.
-	// Otherwise it is a ptrmask bitmap. See mbitmap.go for details.
+	// Normally, GCData points to a bitmask that describes the
+	// ptr/nonptr fields of the type. The bitmask will have at
+	// least PtrBytes/ptrSize bits.
+	// If the TFlagGCMaskOnDemand bit is set, GCData is instead a
+	// **byte and the pointer to the bitmask is one dereference away.
+	// The runtime will build the bitmask if needed.
+	// (See runtime/type.go:getGCMask.)
+	// Note: multiple types may have the same value of GCData,
+	// including when TFlagGCMaskOnDemand is set. The types will, of course,
+	// have the same pointer layout (but not necessarily the same size).
 	GCData    *byte
 	Str       NameOff // string form
 	PtrToThis TypeOff // type for pointer to this type, may be zero
@@ -73,7 +81,6 @@ const (
 const (
 	// TODO (khr, drchase) why aren't these in TFlag?  Investigate, fix if possible.
 	KindDirectIface Kind = 1 << 5
-	KindGCProg      Kind = 1 << 6 // Type.gc points to GC program
 	KindMask        Kind = (1 << 5) - 1
 )
 
@@ -112,11 +119,12 @@ const (
 	// this type as a single region of t.size bytes.
 	TFlagRegularMemory TFlag = 1 << 3
 
-	// TFlagUnrolledBitmap marks special types that are unrolled-bitmap
-	// versions of types with GC programs.
-	// These types need to be deallocated when the underlying object
-	// is freed.
-	TFlagUnrolledBitmap TFlag = 1 << 4
+	// TFlagGCMaskOnDemand means that the GC pointer bitmask will be
+	// computed on demand at runtime instead of being precomputed at
+	// compile time. If this flag is set, the GCData field effectively
+	// has type **byte instead of *byte. The runtime will store a
+	// pointer to the GC pointer bitmask in *GCData.
+	TFlagGCMaskOnDemand TFlag = 1 << 4
 )
 
 // NameOff is the offset to a name from moduledata.types.  See resolveNameOff in runtime.
@@ -206,6 +214,9 @@ func (t *Type) IsDirectIface() bool {
 }
 
 func (t *Type) GcSlice(begin, end uintptr) []byte {
+	if t.TFlag&TFlagGCMaskOnDemand != 0 {
+		panic("GcSlice can't handle on-demand gcdata types")
+	}
 	return unsafe.Slice(t.GCData, int(end))[begin:]
 }
 
@@ -350,7 +361,7 @@ func (t *Type) Uncommon() *UncommonType {
 		return &(*u)(unsafe.Pointer(t)).u
 	case Map:
 		type u struct {
-			MapType
+			mapType
 			u UncommonType
 		}
 		return &(*u)(unsafe.Pointer(t)).u
@@ -379,7 +390,7 @@ func (t *Type) Elem() *Type {
 		tt := (*ChanType)(unsafe.Pointer(t))
 		return tt.Elem
 	case Map:
-		tt := (*MapType)(unsafe.Pointer(t))
+		tt := (*mapType)(unsafe.Pointer(t))
 		return tt.Elem
 	case Pointer:
 		tt := (*PtrType)(unsafe.Pointer(t))
@@ -399,12 +410,12 @@ func (t *Type) StructType() *StructType {
 	return (*StructType)(unsafe.Pointer(t))
 }
 
-// MapType returns t cast to a *MapType, or nil if its tag does not match.
-func (t *Type) MapType() *MapType {
+// MapType returns t cast to a *OldMapType or *SwissMapType, or nil if its tag does not match.
+func (t *Type) MapType() *mapType {
 	if t.Kind() != Map {
 		return nil
 	}
-	return (*MapType)(unsafe.Pointer(t))
+	return (*mapType)(unsafe.Pointer(t))
 }
 
 // ArrayType returns t cast to a *ArrayType, or nil if its tag does not match.
@@ -464,40 +475,9 @@ func (t *Type) NumMethod() int {
 // NumMethod returns the number of interface methods in the type's method set.
 func (t *InterfaceType) NumMethod() int { return len(t.Methods) }
 
-type MapType struct {
-	Type
-	Key    *Type
-	Elem   *Type
-	Bucket *Type // internal type representing a hash bucket
-	// function for hashing keys (ptr to key, seed) -> hash
-	Hasher     func(unsafe.Pointer, uintptr) uintptr
-	KeySize    uint8  // size of key slot
-	ValueSize  uint8  // size of elem slot
-	BucketSize uint16 // size of bucket
-	Flags      uint32
-}
-
-// Note: flag values must match those used in the TMAP case
-// in ../cmd/compile/internal/reflectdata/reflect.go:writeType.
-func (mt *MapType) IndirectKey() bool { // store ptr to key instead of key itself
-	return mt.Flags&1 != 0
-}
-func (mt *MapType) IndirectElem() bool { // store ptr to elem instead of elem itself
-	return mt.Flags&2 != 0
-}
-func (mt *MapType) ReflexiveKey() bool { // true if k==k for all keys
-	return mt.Flags&4 != 0
-}
-func (mt *MapType) NeedKeyUpdate() bool { // true if we need to update key on an overwrite
-	return mt.Flags&8 != 0
-}
-func (mt *MapType) HashMightPanic() bool { // true if hash function might panic
-	return mt.Flags&16 != 0
-}
-
 func (t *Type) Key() *Type {
 	if t.Kind() == Map {
-		return (*MapType)(unsafe.Pointer(t)).Key
+		return (*mapType)(unsafe.Pointer(t)).Key
 	}
 	return nil
 }
diff --git a/src/internal/buildcfg/cfg.go b/src/internal/buildcfg/cfg.go
index a16e76b3..fca09bf8 100644
--- a/src/internal/buildcfg/cfg.go
+++ b/src/internal/buildcfg/cfg.go
@@ -23,7 +23,7 @@ var (
 	GOROOT    = os.Getenv("GOROOT") // cached for efficiency
 	GOARCH    = envOr("GOARCH", defaultGOARCH)
 	GOOS      = envOr("GOOS", defaultGOOS)
-	GO386     = envOr("GO386", defaultGO386)
+	GO386     = envOr("GO386", DefaultGO386)
 	GOAMD64   = goamd64()
 	GOARM     = goarm()
 	GOARM64   = goarm64()
@@ -34,6 +34,7 @@ var (
 	GOWASM    = gowasm()
 	ToolTags  = toolTags()
 	GO_LDSO   = defaultGO_LDSO
+	GOFIPS140 = gofips140()
 	Version   = version
 )
 
@@ -56,7 +57,7 @@ func envOr(key, value string) string {
 }
 
 func goamd64() int {
-	switch v := envOr("GOAMD64", defaultGOAMD64); v {
+	switch v := envOr("GOAMD64", DefaultGOAMD64); v {
 	case "v1":
 		return 1
 	case "v2":
@@ -67,15 +68,56 @@ func goamd64() int {
 		return 4
 	}
 	Error = fmt.Errorf("invalid GOAMD64: must be v1, v2, v3, v4")
-	return int(defaultGOAMD64[len("v")] - '0')
+	return int(DefaultGOAMD64[len("v")] - '0')
 }
 
-type goarmFeatures struct {
+func gofips140() string {
+	v := envOr("GOFIPS140", DefaultGOFIPS140)
+	switch v {
+	case "off", "latest", "inprocess", "certified":
+		return v
+	}
+	if isFIPSVersion(v) {
+		return v
+	}
+	Error = fmt.Errorf("invalid GOFIPS140: must be off, latest, inprocess, certified, or vX.Y.Z")
+	return DefaultGOFIPS140
+}
+
+// isFIPSVersion reports whether v is a valid FIPS version,
+// of the form vX.Y.Z.
+func isFIPSVersion(v string) bool {
+	if !strings.HasPrefix(v, "v") {
+		return false
+	}
+	v, ok := skipNum(v[len("v"):])
+	if !ok || !strings.HasPrefix(v, ".") {
+		return false
+	}
+	v, ok = skipNum(v[len("."):])
+	if !ok || !strings.HasPrefix(v, ".") {
+		return false
+	}
+	v, ok = skipNum(v[len("."):])
+	return ok && v == ""
+}
+
+// skipNum skips the leading text matching [0-9]+
+// in s, returning the rest and whether such text was found.
+func skipNum(s string) (rest string, ok bool) {
+	i := 0
+	for i < len(s) && '0' <= s[i] && s[i] <= '9' {
+		i++
+	}
+	return s[i:], i > 0
+}
+
+type GoarmFeatures struct {
 	Version   int
 	SoftFloat bool
 }
 
-func (g goarmFeatures) String() string {
+func (g GoarmFeatures) String() string {
 	armStr := strconv.Itoa(g.Version)
 	if g.SoftFloat {
 		armStr += ",softfloat"
@@ -85,12 +127,12 @@ func (g goarmFeatures) String() string {
 	return armStr
 }
 
-func goarm() (g goarmFeatures) {
+func goarm() (g GoarmFeatures) {
 	const (
 		softFloatOpt = ",softfloat"
 		hardFloatOpt = ",hardfloat"
 	)
-	def := defaultGOARM
+	def := DefaultGOARM
 	if GOOS == "android" && GOARCH == "arm" {
 		// Android arm devices always support GOARM=7.
 		def = "7"
@@ -186,14 +228,14 @@ func ParseGoarm64(v string) (g Goarm64Features, e error) {
 	default:
 		e = fmt.Errorf("invalid GOARM64: must start with v8.{0-9} or v9.{0-5} and may optionally end in %q and/or %q",
 			lseOpt, cryptoOpt)
-		g.Version = defaultGOARM64
+		g.Version = DefaultGOARM64
 	}
 
 	return
 }
 
 func goarm64() (g Goarm64Features) {
-	g, Error = ParseGoarm64(envOr("GOARM64", defaultGOARM64))
+	g, Error = ParseGoarm64(envOr("GOARM64", DefaultGOARM64))
 	return
 }
 
@@ -229,25 +271,25 @@ func (g Goarm64Features) Supports(s string) bool {
 }
 
 func gomips() string {
-	switch v := envOr("GOMIPS", defaultGOMIPS); v {
+	switch v := envOr("GOMIPS", DefaultGOMIPS); v {
 	case "hardfloat", "softfloat":
 		return v
 	}
 	Error = fmt.Errorf("invalid GOMIPS: must be hardfloat, softfloat")
-	return defaultGOMIPS
+	return DefaultGOMIPS
 }
 
 func gomips64() string {
-	switch v := envOr("GOMIPS64", defaultGOMIPS64); v {
+	switch v := envOr("GOMIPS64", DefaultGOMIPS64); v {
 	case "hardfloat", "softfloat":
 		return v
 	}
 	Error = fmt.Errorf("invalid GOMIPS64: must be hardfloat, softfloat")
-	return defaultGOMIPS64
+	return DefaultGOMIPS64
 }
 
 func goppc64() int {
-	switch v := envOr("GOPPC64", defaultGOPPC64); v {
+	switch v := envOr("GOPPC64", DefaultGOPPC64); v {
 	case "power8":
 		return 8
 	case "power9":
@@ -256,18 +298,18 @@ func goppc64() int {
 		return 10
 	}
 	Error = fmt.Errorf("invalid GOPPC64: must be power8, power9, power10")
-	return int(defaultGOPPC64[len("power")] - '0')
+	return int(DefaultGOPPC64[len("power")] - '0')
 }
 
 func goriscv64() int {
-	switch v := envOr("GORISCV64", defaultGORISCV64); v {
+	switch v := envOr("GORISCV64", DefaultGORISCV64); v {
 	case "rva20u64":
 		return 20
 	case "rva22u64":
 		return 22
 	}
 	Error = fmt.Errorf("invalid GORISCV64: must be rva20u64, rva22u64")
-	v := defaultGORISCV64[len("rva"):]
+	v := DefaultGORISCV64[len("rva"):]
 	i := strings.IndexFunc(v, func(r rune) bool {
 		return r < '0' || r > '9'
 	})
diff --git a/src/internal/buildcfg/cfg_test.go b/src/internal/buildcfg/cfg_test.go
index d01cdd01..757270b7 100644
--- a/src/internal/buildcfg/cfg_test.go
+++ b/src/internal/buildcfg/cfg_test.go
@@ -123,3 +123,39 @@ func TestGogoarchTags(t *testing.T) {
 	GOARCH = old_goarch
 	GOARM64 = old_goarm64
 }
+
+var goodFIPS = []string{
+	"v1.0.0",
+	"v1.0.1",
+	"v1.2.0",
+	"v1.2.3",
+}
+
+var badFIPS = []string{
+	"v1.0.0-fips",
+	"v1.0.0+fips",
+	"1.0.0",
+	"x1.0.0",
+}
+
+func TestIsFIPSVersion(t *testing.T) {
+	// good
+	for _, s := range goodFIPS {
+		if !isFIPSVersion(s) {
+			t.Errorf("isFIPSVersion(%q) = false, want true", s)
+		}
+	}
+	// truncated
+	const v = "v1.2.3"
+	for i := 0; i < len(v); i++ {
+		if isFIPSVersion(v[:i]) {
+			t.Errorf("isFIPSVersion(%q) = true, want false", v[:i])
+		}
+	}
+	// bad
+	for _, s := range badFIPS {
+		if isFIPSVersion(s) {
+			t.Errorf("isFIPSVersion(%q) = true, want false", s)
+		}
+	}
+}
diff --git a/src/internal/buildcfg/exp.go b/src/internal/buildcfg/exp.go
index 7c7cefba..332c9afa 100644
--- a/src/internal/buildcfg/exp.go
+++ b/src/internal/buildcfg/exp.go
@@ -67,10 +67,20 @@ func ParseGOEXPERIMENT(goos, goarch, goexp string) (*ExperimentFlags, error) {
 		regabiSupported = true
 	}
 
+	var haveXchg8 bool
+	switch goarch {
+	case "386", "amd64", "arm", "arm64", "ppc64le", "ppc64":
+		haveXchg8 = true
+	}
+
 	baseline := goexperiment.Flags{
 		RegabiWrappers:   regabiSupported,
 		RegabiArgs:       regabiSupported,
 		CoverageRedesign: true,
+		AliasTypeParams:  true,
+		SwissMap:         true,
+		SpinbitMutex:     haveXchg8,
+		SyncHashTrieMap:  true,
 	}
 
 	// Start with the statically enabled set of experiments.
diff --git a/src/internal/bytealg/compare_loong64.s b/src/internal/bytealg/compare_loong64.s
index df72a112..99c8cda7 100644
--- a/src/internal/bytealg/compare_loong64.s
+++ b/src/internal/bytealg/compare_loong64.s
@@ -28,58 +28,136 @@ TEXT runtime·cmpstring(SB),NOSPLIT,$0-40
 // R7 length of b
 // R4 points to the start of a
 // R6 points to the start of b
-// R13 points to the return value (-1/0/1)
+// for regabi the return value (-1/0/1) in R4
 TEXT cmpbody<>(SB),NOSPLIT|NOFRAME,$0
-	BEQ	R4, R6, samebytes // same start of a and b
+	BEQ	R4, R6, cmp_len		// same start of a and b, then compare lengths
 
 	SGTU	R5, R7, R9
-	BNE	R0, R9, r2_lt_r1
+	BNE	R9, b_lt_a
 	MOVV	R5, R14
 	JMP	entry
-r2_lt_r1:
-	MOVV	R7, R14	// R14 is min(R4, R5)
+b_lt_a:
+	MOVV	R7, R14			// R14 is min(R5, R7)
 entry:
-	ADDV	R4, R14, R12	// R6 start of a, R14 end of a
-	BEQ	R4, R12, samebytes // length is 0
+	ADDV	R4, R14, R12		// R4 start of a, R12 end of a
+	BEQ	R4, R12, cmp_len	// minlength is 0
 
-	SRLV	$4, R14		// R14 is number of chunks
-	BEQ	R0, R14, byte_loop
+tail:
+	MOVV	$2, R15
+	BLT	R14, R15, cmp1		// min < 2
+	SLLV	$1, R15
+	BLT	R14, R15, cmp2		// min < 4
+	SLLV	$1, R15
+	BLT	R14, R15, cmp4		// min < 8
+	SLLV	$1, R15
+	BLT	R14, R15, cmp8		// min < 16
+	SLLV	$1, R15
+	BLT	R14, R15, cmp16		// min < 32
 
-	// make sure both a and b are aligned.
-	OR	R4, R6, R15
-	AND	$7, R15
-	BNE	R0, R15, byte_loop
-
-	PCALIGN	$16
-chunk16_loop:
-	BEQ	R0, R14, byte_loop
+// When min >= 32 bytes, enter the cmp32_loop loop processing:
+// take out 4 8-bytes from a and b in turn for comparison.
+cmp32_loop:
 	MOVV	(R4), R8
 	MOVV	(R6), R9
-	BNE	R8, R9, byte_loop
-	MOVV	8(R4), R16
-	MOVV	8(R6), R17
+	MOVV	8(R4), R10
+	MOVV	8(R6), R11
+	BNE	R8, R9, cmp8a
+	BNE	R10, R11, cmp8b
+	MOVV	16(R4), R8
+	MOVV	16(R6), R9
+	MOVV	24(R4), R10
+	MOVV	24(R6), R11
+	BNE	R8, R9, cmp8a
+	BNE	R10, R11, cmp8b
+	ADDV	$32, R4
+	ADDV	$32, R6
+	SUBV	$32, R14
+	BGE	R14, R15, cmp32_loop
+	BEQ	R14, cmp_len
+
+check16:
+	MOVV	$16, R15
+	BLT	R14, R15, check8
+cmp16:
+	MOVV	(R4), R8
+	MOVV	(R6), R9
+	MOVV	8(R4), R10
+	MOVV	8(R6), R11
+	BNE	R8, R9, cmp8a
+	BNE	R10, R11, cmp8b
 	ADDV	$16, R4
 	ADDV	$16, R6
-	SUBVU	$1, R14
-	BEQ	R16, R17, chunk16_loop
-	SUBV	$8, R4
-	SUBV	$8, R6
+	SUBV	$16, R14
+	BEQ	R14, cmp_len
 
-byte_loop:
-	BEQ	R4, R12, samebytes
+check8:
+	MOVV	$8, R15
+	BLT	R14, R15, check4
+cmp8:
+	MOVV	(R4), R8
+	MOVV	(R6), R9
+	BNE	R8, R9, cmp8a
+	ADDV	$8, R4
+	ADDV	$8, R6
+	SUBV	$8, R14
+	BEQ	R14, cmp_len
+
+check4:
+	MOVV	$4, R15
+	BLT	R14, R15, check2
+cmp4:
+	MOVW	(R4), R8
+	MOVW	(R6), R9
+	BNE	R8, R9, cmp8a
+	ADDV	$4, R4
+	ADDV	$4, R6
+	SUBV	$4, R14
+	BEQ	R14, cmp_len
+
+check2:
+	MOVV	$2, R15
+	BLT	R14, R15, cmp1
+cmp2:
+	MOVH	(R4), R8
+	MOVH	(R6), R9
+	BNE	R8, R9, cmp8a
+	ADDV	$2, R4
+	ADDV	$2, R6
+	SUBV	$2, R14
+	BEQ	R14, cmp_len
+
+cmp1:
+	BEQ	R14, cmp_len
 	MOVBU	(R4), R8
-	ADDVU	$1, R4
 	MOVBU	(R6), R9
-	ADDVU	$1, R6
-	BEQ	R8, R9, byte_loop
+	BNE	R8, R9, byte_cmp
+	JMP	cmp_len
 
+	// Compare 8/4/2 bytes taken from R8/R9 that are known to differ.
+cmp8a:
+	MOVV	R8, R10
+	MOVV	R9, R11
+
+	// Compare 8/4/2 bytes taken from R10/R11 that are known to differ.
+cmp8b:
+	MOVV	$0xff, R15
+
+	// Take single bytes from R10/R11 in turn for cyclic comparison.
+cmp8_loop:
+	AND	R10, R15, R8
+	AND	R11, R15, R9
+	BNE	R8, R9, byte_cmp
+	SLLV	$8, R15
+	JMP	cmp8_loop
+
+	// Compare 1 bytes taken from R8/R9 that are known to differ.
 byte_cmp:
-	SGTU	R8, R9, R4 // R12 = 1 if (R8 > R9)
+	SGTU	R8, R9, R4		// R4 = 1 if (R8 > R9)
 	BNE	R0, R4, ret
 	MOVV	$-1, R4
 	JMP	ret
 
-samebytes:
+cmp_len:
 	SGTU	R5, R7, R8
 	SGTU	R7, R5, R9
 	SUBV	R9, R8, R4
diff --git a/src/internal/bytealg/compare_ppc64x.s b/src/internal/bytealg/compare_ppc64x.s
index 2629251e..a3d56cfd 100644
--- a/src/internal/bytealg/compare_ppc64x.s
+++ b/src/internal/bytealg/compare_ppc64x.s
@@ -61,7 +61,7 @@ TEXT ·Compare(SB),NOSPLIT|NOFRAME,$0-56
 	CMP	R3,R6,CR7
 	ISEL	CR0LT,R4,R7,R9
 	SETB_CR0(R3)
-	BC	$12,30,LR	// beqlr cr7
+	BEQ	CR7,LR
 	BR	cmpbody<>(SB)
 
 TEXT runtime·cmpstring(SB),NOSPLIT|NOFRAME,$0-40
@@ -83,7 +83,7 @@ TEXT runtime·cmpstring(SB),NOSPLIT|NOFRAME,$0-40
 	MOVD	R5,R6
 	MOVD	R3,R5
 	SETB_CR0(R3)
-	BC	$12,30,LR	// beqlr cr7
+	BEQ	CR7,LR
 	BR	cmpbody<>(SB)
 
 #ifdef GOARCH_ppc64le
@@ -143,7 +143,7 @@ cmp64_loop:
 	ADD	$64,R5,R5	// increment to next 64 bytes of A
 	ADD	$64,R6,R6	// increment to next 64 bytes of B
 	BDNZ	cmp64_loop
-	BC	$12,2,LR	// beqlr
+	BEQ	CR0,LR		// beqlr
 
 	// Finish out tail with minimal overlapped checking.
 	// Note, 0 tail is handled by beqlr above.
@@ -215,7 +215,7 @@ cmp32:	// 32 - 63B
 	VCMPEQUDCC	V3,V4,V1
 	BGE	CR6,different
 
-	BC	$12,2,LR	// beqlr
+	BEQ	CR0,LR
 	ADD	R9,R10,R10
 
 	LXVD2X	(R9)(R5),V3
@@ -236,7 +236,7 @@ cmp16:	// 16 - 31B
 	LXVD2X	(R0)(R6),V4
 	VCMPEQUDCC	V3,V4,V1
 	BGE	CR6,different
-	BC	$12,2,LR	// beqlr
+	BEQ	CR0,LR
 
 	LXVD2X	(R9)(R5),V3
 	LXVD2X	(R9)(R6),V4
diff --git a/src/internal/bytealg/equal_arm64.s b/src/internal/bytealg/equal_arm64.s
index 4db95154..408ab374 100644
--- a/src/internal/bytealg/equal_arm64.s
+++ b/src/internal/bytealg/equal_arm64.s
@@ -5,25 +5,11 @@
 #include "go_asm.h"
 #include "textflag.h"
 
-// memequal(a, b unsafe.Pointer, size uintptr) bool
-TEXT runtime·memequal(SB),NOSPLIT|NOFRAME,$0-25
-	// short path to handle 0-byte case
-	CBZ	R2, equal
-	// short path to handle equal pointers
-	CMP	R0, R1
-	BEQ	equal
-	B	memeqbody<>(SB)
-equal:
-	MOVD	$1, R0
-	RET
-
 // memequal_varlen(a, b unsafe.Pointer) bool
 TEXT runtime·memequal_varlen(SB),NOSPLIT,$0-17
-	CMP	R0, R1
-	BEQ	eq
 	MOVD	8(R26), R2    // compiler stores size at offset 8 in the closure
 	CBZ	R2, eq
-	B	memeqbody<>(SB)
+	B	runtime·memequal(SB)
 eq:
 	MOVD	$1, R0
 	RET
@@ -33,7 +19,13 @@ eq:
 // R1: pointer b
 // R2: data len
 // at return: result in R0
-TEXT memeqbody<>(SB),NOSPLIT,$0
+// memequal(a, b unsafe.Pointer, size uintptr) bool
+TEXT runtime·memequal(SB),NOSPLIT|NOFRAME,$0-25
+	// short path to handle 0-byte case
+	CBZ     R2, equal
+	// short path to handle equal pointers
+	CMP     R0, R1
+	BEQ     equal
 	CMP	$1, R2
 	// handle 1-byte special case for better performance
 	BEQ	one
@@ -91,6 +83,7 @@ tail:
 	EOR	R4, R5
 	CBNZ	R5, not_equal
 	B	equal
+	PCALIGN	$16
 lt_8:
 	TBZ	$2, R2, lt_4
 	MOVWU	(R0), R4
@@ -103,6 +96,7 @@ lt_8:
 	EOR	R4, R5
 	CBNZ	R5, not_equal
 	B	equal
+	PCALIGN	$16
 lt_4:
 	TBZ	$1, R2, lt_2
 	MOVHU.P	2(R0), R4
diff --git a/src/internal/bytealg/indexbyte_riscv64.s b/src/internal/bytealg/indexbyte_riscv64.s
index de00983c..fde00da0 100644
--- a/src/internal/bytealg/indexbyte_riscv64.s
+++ b/src/internal/bytealg/indexbyte_riscv64.s
@@ -10,33 +10,14 @@ TEXT ·IndexByte(SB),NOSPLIT,$0-40
 	// X11 = b_len
 	// X12 = b_cap (unused)
 	// X13 = byte to find
-	AND	$0xff, X13
-	MOV	X10, X12		// store base for later
-	ADD	X10, X11		// end
-	SUB	$1, X10
-
-loop:
-	ADD	$1, X10
-	BEQ	X10, X11, notfound
-	MOVBU	(X10), X14
-	BNE	X13, X14, loop
-
-	SUB	X12, X10		// remove base
-	RET
-
-notfound:
-	MOV	$-1, X10
-	RET
-
-TEXT ·IndexByteString(SB),NOSPLIT,$0-32
-	// X10 = b_base
-	// X11 = b_len
-	// X12 = byte to find
-	AND	$0xff, X12
+	AND	$0xff, X13, X12		// x12 byte to look for
 	MOV	X10, X13		// store base for later
-	ADD	X10, X11		// end
-	SUB	$1, X10
 
+	SLTI	$24, X11, X14
+	ADD	X10, X11		// end
+	BEQZ	X14, bigBody
+
+	SUB	$1, X10
 loop:
 	ADD	$1, X10
 	BEQ	X10, X11, notfound
@@ -49,3 +30,110 @@ loop:
 notfound:
 	MOV	$-1, X10
 	RET
+
+bigBody:
+	JMP	indexByteBig<>(SB)
+
+TEXT ·IndexByteString(SB),NOSPLIT,$0-32
+	// X10 = b_base
+	// X11 = b_len
+	// X12 = byte to find
+
+	AND	$0xff, X12		// x12 byte to look for
+	MOV	X10, X13		// store base for later
+
+	SLTI	$24, X11, X14
+	ADD	X10, X11		// end
+	BEQZ	X14, bigBody
+
+	SUB	$1, X10
+loop:
+	ADD	$1, X10
+	BEQ	X10, X11, notfound
+	MOVBU	(X10), X14
+	BNE	X12, X14, loop
+
+	SUB	X13, X10		// remove base
+	RET
+
+notfound:
+	MOV	$-1, X10
+	RET
+
+bigBody:
+	JMP	indexByteBig<>(SB)
+
+TEXT indexByteBig<>(SB),NOSPLIT|NOFRAME,$0
+	// On entry
+	// X10 = b_base
+	// X11 = end
+	// X12 = byte to find
+	// X13 = b_base
+	// X11 is at least 16 bytes > X10
+
+	// On exit
+	// X10 = index of first instance of sought byte, if found, or -1 otherwise
+
+	// Process the first few bytes until we get to an 8 byte boundary
+	// No need to check for end here as we have at least 16 bytes in
+	// the buffer.
+
+unalignedloop:
+	AND	$7, X10, X14
+	BEQZ	X14, aligned
+	MOVBU	(X10), X14
+	BEQ	X12, X14, found
+	ADD	$1, X10
+	JMP	unalignedloop
+
+aligned:
+	AND	$~7, X11, X15		// X15 = end of aligned data
+
+	// We have at least 9 bytes left
+
+	// Use 'Determine if a word has a byte equal to n' bit hack from
+	// https://graphics.stanford.edu/~seander/bithacks.html to determine
+	// whether the byte is present somewhere in the next 8 bytes of the
+	// array.
+
+	MOV	$0x0101010101010101, X16
+	SLLI	$7, X16, X17		// X17 = 0x8080808080808080
+
+	MUL	X12, X16, X18		// broadcast X12 to every byte in X18
+
+alignedloop:
+	MOV	(X10), X14
+	XOR	X14, X18, X19
+
+	// If the LSB in X12 is present somewhere in the 8 bytes we've just
+	// loaded into X14 then at least one of the bytes in X19 will be 0
+	// after the XOR.  If any of the bytes in X19 are zero then
+	//
+	// ((X19 - X16) & (~X19) & X17)
+	//
+	// will be non-zero.  The expression will evaluate to zero if none of
+	// the bytes in X19 are zero, i.e., X12 is not present in X14.
+
+	SUB	X16, X19, X20
+	ANDN	X19, X17, X21
+	AND	X20, X21
+	BNEZ	X21, tailloop		// If X21 != 0 X12 is present in X14
+	ADD	$8, X10
+	BNE	X10, X15, alignedloop
+
+tailloop:
+	SUB	$1, X10
+
+loop:
+	ADD	$1, X10
+	BEQ	X10, X11, notfound
+	MOVBU	(X10), X14
+	BNE	X12, X14, loop
+
+found:
+	SUB	X13, X10		// remove base
+	RET
+
+notfound:
+	MOV	$-1, X10
+	RET
diff --git a/src/internal/byteorder/byteorder.go b/src/internal/byteorder/byteorder.go
index ba37856c..01500a87 100644
--- a/src/internal/byteorder/byteorder.go
+++ b/src/internal/byteorder/byteorder.go
@@ -6,30 +6,30 @@
 // little and big endian integer types from/to byte slices.
 package byteorder
 
-func LeUint16(b []byte) uint16 {
+func LEUint16(b []byte) uint16 {
 	_ = b[1] // bounds check hint to compiler; see golang.org/issue/14808
 	return uint16(b[0]) | uint16(b[1])<<8
 }
 
-func LePutUint16(b []byte, v uint16) {
+func LEPutUint16(b []byte, v uint16) {
 	_ = b[1] // early bounds check to guarantee safety of writes below
 	b[0] = byte(v)
 	b[1] = byte(v >> 8)
 }
 
-func LeAppendUint16(b []byte, v uint16) []byte {
+func LEAppendUint16(b []byte, v uint16) []byte {
 	return append(b,
 		byte(v),
 		byte(v>>8),
 	)
 }
 
-func LeUint32(b []byte) uint32 {
+func LEUint32(b []byte) uint32 {
 	_ = b[3] // bounds check hint to compiler; see golang.org/issue/14808
 	return uint32(b[0]) | uint32(b[1])<<8 | uint32(b[2])<<16 | uint32(b[3])<<24
 }
 
-func LePutUint32(b []byte, v uint32) {
+func LEPutUint32(b []byte, v uint32) {
 	_ = b[3] // early bounds check to guarantee safety of writes below
 	b[0] = byte(v)
 	b[1] = byte(v >> 8)
@@ -37,7 +37,7 @@ func LePutUint32(b []byte, v uint32) {
 	b[3] = byte(v >> 24)
 }
 
-func LeAppendUint32(b []byte, v uint32) []byte {
+func LEAppendUint32(b []byte, v uint32) []byte {
 	return append(b,
 		byte(v),
 		byte(v>>8),
@@ -46,13 +46,13 @@ func LeAppendUint32(b []byte, v uint32) []byte {
 	)
 }
 
-func LeUint64(b []byte) uint64 {
+func LEUint64(b []byte) uint64 {
 	_ = b[7] // bounds check hint to compiler; see golang.org/issue/14808
 	return uint64(b[0]) | uint64(b[1])<<8 | uint64(b[2])<<16 | uint64(b[3])<<24 |
 		uint64(b[4])<<32 | uint64(b[5])<<40 | uint64(b[6])<<48 | uint64(b[7])<<56
 }
 
-func LePutUint64(b []byte, v uint64) {
+func LEPutUint64(b []byte, v uint64) {
 	_ = b[7] // early bounds check to guarantee safety of writes below
 	b[0] = byte(v)
 	b[1] = byte(v >> 8)
@@ -64,7 +64,7 @@ func LePutUint64(b []byte, v uint64) {
 	b[7] = byte(v >> 56)
 }
 
-func LeAppendUint64(b []byte, v uint64) []byte {
+func LEAppendUint64(b []byte, v uint64) []byte {
 	return append(b,
 		byte(v),
 		byte(v>>8),
@@ -77,30 +77,30 @@ func LeAppendUint64(b []byte, v uint64) []byte {
 	)
 }
 
-func BeUint16(b []byte) uint16 {
+func BEUint16(b []byte) uint16 {
 	_ = b[1] // bounds check hint to compiler; see golang.org/issue/14808
 	return uint16(b[1]) | uint16(b[0])<<8
 }
 
-func BePutUint16(b []byte, v uint16) {
+func BEPutUint16(b []byte, v uint16) {
 	_ = b[1] // early bounds check to guarantee safety of writes below
 	b[0] = byte(v >> 8)
 	b[1] = byte(v)
 }
 
-func BeAppendUint16(b []byte, v uint16) []byte {
+func BEAppendUint16(b []byte, v uint16) []byte {
 	return append(b,
 		byte(v>>8),
 		byte(v),
 	)
 }
 
-func BeUint32(b []byte) uint32 {
+func BEUint32(b []byte) uint32 {
 	_ = b[3] // bounds check hint to compiler; see golang.org/issue/14808
 	return uint32(b[3]) | uint32(b[2])<<8 | uint32(b[1])<<16 | uint32(b[0])<<24
 }
 
-func BePutUint32(b []byte, v uint32) {
+func BEPutUint32(b []byte, v uint32) {
 	_ = b[3] // early bounds check to guarantee safety of writes below
 	b[0] = byte(v >> 24)
 	b[1] = byte(v >> 16)
@@ -108,7 +108,7 @@ func BePutUint32(b []byte, v uint32) {
 	b[3] = byte(v)
 }
 
-func BeAppendUint32(b []byte, v uint32) []byte {
+func BEAppendUint32(b []byte, v uint32) []byte {
 	return append(b,
 		byte(v>>24),
 		byte(v>>16),
@@ -117,13 +117,13 @@ func BeAppendUint32(b []byte, v uint32) []byte {
 	)
 }
 
-func BeUint64(b []byte) uint64 {
+func BEUint64(b []byte) uint64 {
 	_ = b[7] // bounds check hint to compiler; see golang.org/issue/14808
 	return uint64(b[7]) | uint64(b[6])<<8 | uint64(b[5])<<16 | uint64(b[4])<<24 |
 		uint64(b[3])<<32 | uint64(b[2])<<40 | uint64(b[1])<<48 | uint64(b[0])<<56
 }
 
-func BePutUint64(b []byte, v uint64) {
+func BEPutUint64(b []byte, v uint64) {
 	_ = b[7] // early bounds check to guarantee safety of writes below
 	b[0] = byte(v >> 56)
 	b[1] = byte(v >> 48)
@@ -135,7 +135,7 @@ func BePutUint64(b []byte, v uint64) {
 	b[7] = byte(v)
 }
 
-func BeAppendUint64(b []byte, v uint64) []byte {
+func BEAppendUint64(b []byte, v uint64) []byte {
 	return append(b,
 		byte(v>>56),
 		byte(v>>48),
diff --git a/src/internal/cfg/cfg.go b/src/internal/cfg/cfg.go
index 08d210b7..93297697 100644
--- a/src/internal/cfg/cfg.go
+++ b/src/internal/cfg/cfg.go
@@ -37,12 +37,14 @@ const KnownEnv = `
 	GOARCH
 	GOARM
 	GOARM64
+	GOAUTH
 	GOBIN
 	GOCACHE
 	GOCACHEPROG
 	GOENV
 	GOEXE
 	GOEXPERIMENT
+	GOFIPS140
 	GOFLAGS
 	GOGCCFLAGS
 	GOHOSTARCH
diff --git a/src/internal/chacha8rand/chacha8.go b/src/internal/chacha8rand/chacha8.go
index 8f1b4e53..96fb8726 100644
--- a/src/internal/chacha8rand/chacha8.go
+++ b/src/internal/chacha8rand/chacha8.go
@@ -53,10 +53,10 @@ func (s *State) Next() (uint64, bool) {
 // Init seeds the State with the given seed value.
 func (s *State) Init(seed [32]byte) {
 	s.Init64([4]uint64{
-		byteorder.LeUint64(seed[0*8:]),
-		byteorder.LeUint64(seed[1*8:]),
-		byteorder.LeUint64(seed[2*8:]),
-		byteorder.LeUint64(seed[3*8:]),
+		byteorder.LEUint64(seed[0*8:]),
+		byteorder.LEUint64(seed[1*8:]),
+		byteorder.LEUint64(seed[2*8:]),
+		byteorder.LEUint64(seed[3*8:]),
 	})
 }
 
@@ -124,9 +124,9 @@ func Marshal(s *State) []byte {
 	data := make([]byte, 6*8)
 	copy(data, "chacha8:")
 	used := (s.c/ctrInc)*chunk + s.i
-	byteorder.BePutUint64(data[1*8:], uint64(used))
+	byteorder.BEPutUint64(data[1*8:], uint64(used))
 	for i, seed := range s.seed {
-		byteorder.LePutUint64(data[(2+i)*8:], seed)
+		byteorder.LEPutUint64(data[(2+i)*8:], seed)
 	}
 	return data
 }
@@ -142,12 +142,12 @@ func Unmarshal(s *State, data []byte) error {
 	if len(data) != 6*8 || string(data[:8]) != "chacha8:" {
 		return new(errUnmarshalChaCha8)
 	}
-	used := byteorder.BeUint64(data[1*8:])
+	used := byteorder.BEUint64(data[1*8:])
 	if used > (ctrMax/ctrInc)*chunk-reseed {
 		return new(errUnmarshalChaCha8)
 	}
 	for i := range s.seed {
-		s.seed[i] = byteorder.LeUint64(data[(2+i)*8:])
+		s.seed[i] = byteorder.LEUint64(data[(2+i)*8:])
 	}
 	s.c = ctrInc * (uint32(used) / chunk)
 	block(&s.seed, &s.buf, s.c)
diff --git a/src/internal/concurrent/hashtriemap.go b/src/internal/concurrent/hashtriemap.go
deleted file mode 100644
index 4f7e730d..00000000
--- a/src/internal/concurrent/hashtriemap.go
+++ /dev/null
@@ -1,408 +0,0 @@
-// Copyright 2024 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package concurrent
-
-import (
-	"internal/abi"
-	"internal/goarch"
-	"math/rand/v2"
-	"sync"
-	"sync/atomic"
-	"unsafe"
-)
-
-// HashTrieMap is an implementation of a concurrent hash-trie. The implementation
-// is designed around frequent loads, but offers decent performance for stores
-// and deletes as well, especially if the map is larger. It's primary use-case is
-// the unique package, but can be used elsewhere as well.
-type HashTrieMap[K, V comparable] struct {
-	root     *indirect[K, V]
-	keyHash  hashFunc
-	keyEqual equalFunc
-	valEqual equalFunc
-	seed     uintptr
-}
-
-// NewHashTrieMap creates a new HashTrieMap for the provided key and value.
-func NewHashTrieMap[K, V comparable]() *HashTrieMap[K, V] {
-	var m map[K]V
-	mapType := abi.TypeOf(m).MapType()
-	ht := &HashTrieMap[K, V]{
-		root:     newIndirectNode[K, V](nil),
-		keyHash:  mapType.Hasher,
-		keyEqual: mapType.Key.Equal,
-		valEqual: mapType.Elem.Equal,
-		seed:     uintptr(rand.Uint64()),
-	}
-	return ht
-}
-
-type hashFunc func(unsafe.Pointer, uintptr) uintptr
-type equalFunc func(unsafe.Pointer, unsafe.Pointer) bool
-
-// Load returns the value stored in the map for a key, or nil if no
-// value is present.
-// The ok result indicates whether value was found in the map.
-func (ht *HashTrieMap[K, V]) Load(key K) (value V, ok bool) {
-	hash := ht.keyHash(abi.NoEscape(unsafe.Pointer(&key)), ht.seed)
-
-	i := ht.root
-	hashShift := 8 * goarch.PtrSize
-	for hashShift != 0 {
-		hashShift -= nChildrenLog2
-
-		n := i.children[(hash>>hashShift)&nChildrenMask].Load()
-		if n == nil {
-			return *new(V), false
-		}
-		if n.isEntry {
-			return n.entry().lookup(key, ht.keyEqual)
-		}
-		i = n.indirect()
-	}
-	panic("internal/concurrent.HashMapTrie: ran out of hash bits while iterating")
-}
-
-// LoadOrStore returns the existing value for the key if present.
-// Otherwise, it stores and returns the given value.
-// The loaded result is true if the value was loaded, false if stored.
-func (ht *HashTrieMap[K, V]) LoadOrStore(key K, value V) (result V, loaded bool) {
-	hash := ht.keyHash(abi.NoEscape(unsafe.Pointer(&key)), ht.seed)
-	var i *indirect[K, V]
-	var hashShift uint
-	var slot *atomic.Pointer[node[K, V]]
-	var n *node[K, V]
-	for {
-		// Find the key or a candidate location for insertion.
-		i = ht.root
-		hashShift = 8 * goarch.PtrSize
-		haveInsertPoint := false
-		for hashShift != 0 {
-			hashShift -= nChildrenLog2
-
-			slot = &i.children[(hash>>hashShift)&nChildrenMask]
-			n = slot.Load()
-			if n == nil {
-				// We found a nil slot which is a candidate for insertion.
-				haveInsertPoint = true
-				break
-			}
-			if n.isEntry {
-				// We found an existing entry, which is as far as we can go.
-				// If it stays this way, we'll have to replace it with an
-				// indirect node.
-				if v, ok := n.entry().lookup(key, ht.keyEqual); ok {
-					return v, true
-				}
-				haveInsertPoint = true
-				break
-			}
-			i = n.indirect()
-		}
-		if !haveInsertPoint {
-			panic("internal/concurrent.HashMapTrie: ran out of hash bits while iterating")
-		}
-
-		// Grab the lock and double-check what we saw.
-		i.mu.Lock()
-		n = slot.Load()
-		if (n == nil || n.isEntry) && !i.dead.Load() {
-			// What we saw is still true, so we can continue with the insert.
-			break
-		}
-		// We have to start over.
-		i.mu.Unlock()
-	}
-	// N.B. This lock is held from when we broke out of the outer loop above.
-	// We specifically break this out so that we can use defer here safely.
-	// One option is to break this out into a new function instead, but
-	// there's so much local iteration state used below that this turns out
-	// to be cleaner.
-	defer i.mu.Unlock()
-
-	var oldEntry *entry[K, V]
-	if n != nil {
-		oldEntry = n.entry()
-		if v, ok := oldEntry.lookup(key, ht.keyEqual); ok {
-			// Easy case: by loading again, it turns out exactly what we wanted is here!
-			return v, true
-		}
-	}
-	newEntry := newEntryNode(key, value)
-	if oldEntry == nil {
-		// Easy case: create a new entry and store it.
-		slot.Store(&newEntry.node)
-	} else {
-		// We possibly need to expand the entry already there into one or more new nodes.
-		//
-		// Publish the node last, which will make both oldEntry and newEntry visible. We
-		// don't want readers to be able to observe that oldEntry isn't in the tree.
-		slot.Store(ht.expand(oldEntry, newEntry, hash, hashShift, i))
-	}
-	return value, false
-}
-
-// expand takes oldEntry and newEntry whose hashes conflict from bit 64 down to hashShift and
-// produces a subtree of indirect nodes to hold the two new entries.
-func (ht *HashTrieMap[K, V]) expand(oldEntry, newEntry *entry[K, V], newHash uintptr, hashShift uint, parent *indirect[K, V]) *node[K, V] {
-	// Check for a hash collision.
-	oldHash := ht.keyHash(unsafe.Pointer(&oldEntry.key), ht.seed)
-	if oldHash == newHash {
-		// Store the old entry in the new entry's overflow list, then store
-		// the new entry.
-		newEntry.overflow.Store(oldEntry)
-		return &newEntry.node
-	}
-	// We have to add an indirect node. Worse still, we may need to add more than one.
-	newIndirect := newIndirectNode(parent)
-	top := newIndirect
-	for {
-		if hashShift == 0 {
-			panic("internal/concurrent.HashMapTrie: ran out of hash bits while inserting")
-		}
-		hashShift -= nChildrenLog2 // hashShift is for the level parent is at. We need to go deeper.
-		oi := (oldHash >> hashShift) & nChildrenMask
-		ni := (newHash >> hashShift) & nChildrenMask
-		if oi != ni {
-			newIndirect.children[oi].Store(&oldEntry.node)
-			newIndirect.children[ni].Store(&newEntry.node)
-			break
-		}
-		nextIndirect := newIndirectNode(newIndirect)
-		newIndirect.children[oi].Store(&nextIndirect.node)
-		newIndirect = nextIndirect
-	}
-	return &top.node
-}
-
-// CompareAndDelete deletes the entry for key if its value is equal to old.
-//
-// If there is no current value for key in the map, CompareAndDelete returns false
-// (even if the old value is the nil interface value).
-func (ht *HashTrieMap[K, V]) CompareAndDelete(key K, old V) (deleted bool) {
-	hash := ht.keyHash(abi.NoEscape(unsafe.Pointer(&key)), ht.seed)
-	var i *indirect[K, V]
-	var hashShift uint
-	var slot *atomic.Pointer[node[K, V]]
-	var n *node[K, V]
-	for {
-		// Find the key or return when there's nothing to delete.
-		i = ht.root
-		hashShift = 8 * goarch.PtrSize
-		found := false
-		for hashShift != 0 {
-			hashShift -= nChildrenLog2
-
-			slot = &i.children[(hash>>hashShift)&nChildrenMask]
-			n = slot.Load()
-			if n == nil {
-				// Nothing to delete. Give up.
-				return
-			}
-			if n.isEntry {
-				// We found an entry. Check if it matches.
-				if _, ok := n.entry().lookup(key, ht.keyEqual); !ok {
-					// No match, nothing to delete.
-					return
-				}
-				// We've got something to delete.
-				found = true
-				break
-			}
-			i = n.indirect()
-		}
-		if !found {
-			panic("internal/concurrent.HashMapTrie: ran out of hash bits while iterating")
-		}
-
-		// Grab the lock and double-check what we saw.
-		i.mu.Lock()
-		n = slot.Load()
-		if !i.dead.Load() {
-			if n == nil {
-				// Valid node that doesn't contain what we need. Nothing to delete.
-				i.mu.Unlock()
-				return
-			}
-			if n.isEntry {
-				// What we saw is still true, so we can continue with the delete.
-				break
-			}
-		}
-		// We have to start over.
-		i.mu.Unlock()
-	}
-	// Try to delete the entry.
-	e, deleted := n.entry().compareAndDelete(key, old, ht.keyEqual, ht.valEqual)
-	if !deleted {
-		// Nothing was actually deleted, which means the node is no longer there.
-		i.mu.Unlock()
-		return false
-	}
-	if e != nil {
-		// We didn't actually delete the whole entry, just one entry in the chain.
-		// Nothing else to do, since the parent is definitely not empty.
-		slot.Store(&e.node)
-		i.mu.Unlock()
-		return true
-	}
-	// Delete the entry.
-	slot.Store(nil)
-
-	// Check if the node is now empty (and isn't the root), and delete it if able.
-	for i.parent != nil && i.empty() {
-		if hashShift == 8*goarch.PtrSize {
-			panic("internal/concurrent.HashMapTrie: ran out of hash bits while iterating")
-		}
-		hashShift += nChildrenLog2
-
-		// Delete the current node in the parent.
-		parent := i.parent
-		parent.mu.Lock()
-		i.dead.Store(true)
-		parent.children[(hash>>hashShift)&nChildrenMask].Store(nil)
-		i.mu.Unlock()
-		i = parent
-	}
-	i.mu.Unlock()
-	return true
-}
-
-// All returns an iter.Seq2 that produces all key-value pairs in the map.
-// The enumeration does not represent any consistent snapshot of the map,
-// but is guaranteed to visit each unique key-value pair only once. It is
-// safe to operate on the tree during iteration. No particular enumeration
-// order is guaranteed.
-func (ht *HashTrieMap[K, V]) All() func(yield func(K, V) bool) {
-	return func(yield func(key K, value V) bool) {
-		ht.iter(ht.root, yield)
-	}
-}
-
-func (ht *HashTrieMap[K, V]) iter(i *indirect[K, V], yield func(key K, value V) bool) bool {
-	for j := range i.children {
-		n := i.children[j].Load()
-		if n == nil {
-			continue
-		}
-		if !n.isEntry {
-			if !ht.iter(n.indirect(), yield) {
-				return false
-			}
-			continue
-		}
-		e := n.entry()
-		for e != nil {
-			if !yield(e.key, e.value) {
-				return false
-			}
-			e = e.overflow.Load()
-		}
-	}
-	return true
-}
-
-const (
-	// 16 children. This seems to be the sweet spot for
-	// load performance: any smaller and we lose out on
-	// 50% or more in CPU performance. Any larger and the
-	// returns are minuscule (~1% improvement for 32 children).
-	nChildrenLog2 = 4
-	nChildren     = 1 << nChildrenLog2
-	nChildrenMask = nChildren - 1
-)
-
-// indirect is an internal node in the hash-trie.
-type indirect[K, V comparable] struct {
-	node[K, V]
-	dead     atomic.Bool
-	mu       sync.Mutex // Protects mutation to children and any children that are entry nodes.
-	parent   *indirect[K, V]
-	children [nChildren]atomic.Pointer[node[K, V]]
-}
-
-func newIndirectNode[K, V comparable](parent *indirect[K, V]) *indirect[K, V] {
-	return &indirect[K, V]{node: node[K, V]{isEntry: false}, parent: parent}
-}
-
-func (i *indirect[K, V]) empty() bool {
-	nc := 0
-	for j := range i.children {
-		if i.children[j].Load() != nil {
-			nc++
-		}
-	}
-	return nc == 0
-}
-
-// entry is a leaf node in the hash-trie.
-type entry[K, V comparable] struct {
-	node[K, V]
-	overflow atomic.Pointer[entry[K, V]] // Overflow for hash collisions.
-	key      K
-	value    V
-}
-
-func newEntryNode[K, V comparable](key K, value V) *entry[K, V] {
-	return &entry[K, V]{
-		node:  node[K, V]{isEntry: true},
-		key:   key,
-		value: value,
-	}
-}
-
-func (e *entry[K, V]) lookup(key K, equal equalFunc) (V, bool) {
-	for e != nil {
-		if equal(unsafe.Pointer(&e.key), abi.NoEscape(unsafe.Pointer(&key))) {
-			return e.value, true
-		}
-		e = e.overflow.Load()
-	}
-	return *new(V), false
-}
-
-// compareAndDelete deletes an entry in the overflow chain if both the key and value compare
-// equal. Returns the new entry chain and whether or not anything was deleted.
-//
-// compareAndDelete must be called under the mutex of the indirect node which e is a child of.
-func (head *entry[K, V]) compareAndDelete(key K, value V, keyEqual, valEqual equalFunc) (*entry[K, V], bool) {
-	if keyEqual(unsafe.Pointer(&head.key), abi.NoEscape(unsafe.Pointer(&key))) &&
-		valEqual(unsafe.Pointer(&head.value), abi.NoEscape(unsafe.Pointer(&value))) {
-		// Drop the head of the list.
-		return head.overflow.Load(), true
-	}
-	i := &head.overflow
-	e := i.Load()
-	for e != nil {
-		if keyEqual(unsafe.Pointer(&e.key), abi.NoEscape(unsafe.Pointer(&key))) &&
-			valEqual(unsafe.Pointer(&e.value), abi.NoEscape(unsafe.Pointer(&value))) {
-			i.Store(e.overflow.Load())
-			return head, true
-		}
-		i = &e.overflow
-		e = e.overflow.Load()
-	}
-	return head, false
-}
-
-// node is the header for a node. It's polymorphic and
-// is actually either an entry or an indirect.
-type node[K, V comparable] struct {
-	isEntry bool
-}
-
-func (n *node[K, V]) entry() *entry[K, V] {
-	if !n.isEntry {
-		panic("called entry on non-entry node")
-	}
-	return (*entry[K, V])(unsafe.Pointer(n))
-}
-
-func (n *node[K, V]) indirect() *indirect[K, V] {
-	if n.isEntry {
-		panic("called indirect on entry node")
-	}
-	return (*indirect[K, V])(unsafe.Pointer(n))
-}
diff --git a/src/internal/concurrent/hashtriemap_test.go b/src/internal/concurrent/hashtriemap_test.go
deleted file mode 100644
index e233824c..00000000
--- a/src/internal/concurrent/hashtriemap_test.go
+++ /dev/null
@@ -1,371 +0,0 @@
-// Copyright 2024 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package concurrent
-
-import (
-	"fmt"
-	"math"
-	"runtime"
-	"strconv"
-	"strings"
-	"sync"
-	"testing"
-	"unsafe"
-)
-
-func TestHashTrieMap(t *testing.T) {
-	testHashTrieMap(t, func() *HashTrieMap[string, int] {
-		return NewHashTrieMap[string, int]()
-	})
-}
-
-func TestHashTrieMapBadHash(t *testing.T) {
-	testHashTrieMap(t, func() *HashTrieMap[string, int] {
-		// Stub out the good hash function with a terrible one.
-		// Everything should still work as expected.
-		m := NewHashTrieMap[string, int]()
-		m.keyHash = func(_ unsafe.Pointer, _ uintptr) uintptr {
-			return 0
-		}
-		return m
-	})
-}
-
-func testHashTrieMap(t *testing.T, newMap func() *HashTrieMap[string, int]) {
-	t.Run("LoadEmpty", func(t *testing.T) {
-		m := newMap()
-
-		for _, s := range testData {
-			expectMissing(t, s, 0)(m.Load(s))
-		}
-	})
-	t.Run("LoadOrStore", func(t *testing.T) {
-		m := newMap()
-
-		for i, s := range testData {
-			expectMissing(t, s, 0)(m.Load(s))
-			expectStored(t, s, i)(m.LoadOrStore(s, i))
-			expectPresent(t, s, i)(m.Load(s))
-			expectLoaded(t, s, i)(m.LoadOrStore(s, 0))
-		}
-		for i, s := range testData {
-			expectPresent(t, s, i)(m.Load(s))
-			expectLoaded(t, s, i)(m.LoadOrStore(s, 0))
-		}
-	})
-	t.Run("CompareAndDeleteAll", func(t *testing.T) {
-		m := newMap()
-
-		for range 3 {
-			for i, s := range testData {
-				expectMissing(t, s, 0)(m.Load(s))
-				expectStored(t, s, i)(m.LoadOrStore(s, i))
-				expectPresent(t, s, i)(m.Load(s))
-				expectLoaded(t, s, i)(m.LoadOrStore(s, 0))
-			}
-			for i, s := range testData {
-				expectPresent(t, s, i)(m.Load(s))
-				expectNotDeleted(t, s, math.MaxInt)(m.CompareAndDelete(s, math.MaxInt))
-				expectDeleted(t, s, i)(m.CompareAndDelete(s, i))
-				expectNotDeleted(t, s, i)(m.CompareAndDelete(s, i))
-				expectMissing(t, s, 0)(m.Load(s))
-			}
-			for _, s := range testData {
-				expectMissing(t, s, 0)(m.Load(s))
-			}
-		}
-	})
-	t.Run("CompareAndDeleteOne", func(t *testing.T) {
-		m := newMap()
-
-		for i, s := range testData {
-			expectMissing(t, s, 0)(m.Load(s))
-			expectStored(t, s, i)(m.LoadOrStore(s, i))
-			expectPresent(t, s, i)(m.Load(s))
-			expectLoaded(t, s, i)(m.LoadOrStore(s, 0))
-		}
-		expectNotDeleted(t, testData[15], math.MaxInt)(m.CompareAndDelete(testData[15], math.MaxInt))
-		expectDeleted(t, testData[15], 15)(m.CompareAndDelete(testData[15], 15))
-		expectNotDeleted(t, testData[15], 15)(m.CompareAndDelete(testData[15], 15))
-		for i, s := range testData {
-			if i == 15 {
-				expectMissing(t, s, 0)(m.Load(s))
-			} else {
-				expectPresent(t, s, i)(m.Load(s))
-			}
-		}
-	})
-	t.Run("DeleteMultiple", func(t *testing.T) {
-		m := newMap()
-
-		for i, s := range testData {
-			expectMissing(t, s, 0)(m.Load(s))
-			expectStored(t, s, i)(m.LoadOrStore(s, i))
-			expectPresent(t, s, i)(m.Load(s))
-			expectLoaded(t, s, i)(m.LoadOrStore(s, 0))
-		}
-		for _, i := range []int{1, 105, 6, 85} {
-			expectNotDeleted(t, testData[i], math.MaxInt)(m.CompareAndDelete(testData[i], math.MaxInt))
-			expectDeleted(t, testData[i], i)(m.CompareAndDelete(testData[i], i))
-			expectNotDeleted(t, testData[i], i)(m.CompareAndDelete(testData[i], i))
-		}
-		for i, s := range testData {
-			if i == 1 || i == 105 || i == 6 || i == 85 {
-				expectMissing(t, s, 0)(m.Load(s))
-			} else {
-				expectPresent(t, s, i)(m.Load(s))
-			}
-		}
-	})
-	t.Run("All", func(t *testing.T) {
-		m := newMap()
-
-		testAll(t, m, testDataMap(testData[:]), func(_ string, _ int) bool {
-			return true
-		})
-	})
-	t.Run("AllDelete", func(t *testing.T) {
-		m := newMap()
-
-		testAll(t, m, testDataMap(testData[:]), func(s string, i int) bool {
-			expectDeleted(t, s, i)(m.CompareAndDelete(s, i))
-			return true
-		})
-		for _, s := range testData {
-			expectMissing(t, s, 0)(m.Load(s))
-		}
-	})
-	t.Run("ConcurrentLifecycleUnsharedKeys", func(t *testing.T) {
-		m := newMap()
-
-		gmp := runtime.GOMAXPROCS(-1)
-		var wg sync.WaitGroup
-		for i := range gmp {
-			wg.Add(1)
-			go func(id int) {
-				defer wg.Done()
-
-				makeKey := func(s string) string {
-					return s + "-" + strconv.Itoa(id)
-				}
-				for _, s := range testData {
-					key := makeKey(s)
-					expectMissing(t, key, 0)(m.Load(key))
-					expectStored(t, key, id)(m.LoadOrStore(key, id))
-					expectPresent(t, key, id)(m.Load(key))
-					expectLoaded(t, key, id)(m.LoadOrStore(key, 0))
-				}
-				for _, s := range testData {
-					key := makeKey(s)
-					expectPresent(t, key, id)(m.Load(key))
-					expectDeleted(t, key, id)(m.CompareAndDelete(key, id))
-					expectMissing(t, key, 0)(m.Load(key))
-				}
-				for _, s := range testData {
-					key := makeKey(s)
-					expectMissing(t, key, 0)(m.Load(key))
-				}
-			}(i)
-		}
-		wg.Wait()
-	})
-	t.Run("ConcurrentDeleteSharedKeys", func(t *testing.T) {
-		m := newMap()
-
-		// Load up the map.
-		for i, s := range testData {
-			expectMissing(t, s, 0)(m.Load(s))
-			expectStored(t, s, i)(m.LoadOrStore(s, i))
-		}
-		gmp := runtime.GOMAXPROCS(-1)
-		var wg sync.WaitGroup
-		for i := range gmp {
-			wg.Add(1)
-			go func(id int) {
-				defer wg.Done()
-
-				for i, s := range testData {
-					expectNotDeleted(t, s, math.MaxInt)(m.CompareAndDelete(s, math.MaxInt))
-					m.CompareAndDelete(s, i)
-					expectMissing(t, s, 0)(m.Load(s))
-				}
-				for _, s := range testData {
-					expectMissing(t, s, 0)(m.Load(s))
-				}
-			}(i)
-		}
-		wg.Wait()
-	})
-}
-
-func testAll[K, V comparable](t *testing.T, m *HashTrieMap[K, V], testData map[K]V, yield func(K, V) bool) {
-	for k, v := range testData {
-		expectStored(t, k, v)(m.LoadOrStore(k, v))
-	}
-	visited := make(map[K]int)
-	m.All()(func(key K, got V) bool {
-		want, ok := testData[key]
-		if !ok {
-			t.Errorf("unexpected key %v in map", key)
-			return false
-		}
-		if got != want {
-			t.Errorf("expected key %v to have value %v, got %v", key, want, got)
-			return false
-		}
-		visited[key]++
-		return yield(key, got)
-	})
-	for key, n := range visited {
-		if n > 1 {
-			t.Errorf("visited key %v more than once", key)
-		}
-	}
-}
-
-func expectPresent[K, V comparable](t *testing.T, key K, want V) func(got V, ok bool) {
-	t.Helper()
-	return func(got V, ok bool) {
-		t.Helper()
-
-		if !ok {
-			t.Errorf("expected key %v to be present in map", key)
-		}
-		if ok && got != want {
-			t.Errorf("expected key %v to have value %v, got %v", key, want, got)
-		}
-	}
-}
-
-func expectMissing[K, V comparable](t *testing.T, key K, want V) func(got V, ok bool) {
-	t.Helper()
-	if want != *new(V) {
-		// This is awkward, but the want argument is necessary to smooth over type inference.
-		// Just make sure the want argument always looks the same.
-		panic("expectMissing must always have a zero value variable")
-	}
-	return func(got V, ok bool) {
-		t.Helper()
-
-		if ok {
-			t.Errorf("expected key %v to be missing from map, got value %v", key, got)
-		}
-		if !ok && got != want {
-			t.Errorf("expected missing key %v to be paired with the zero value; got %v", key, got)
-		}
-	}
-}
-
-func expectLoaded[K, V comparable](t *testing.T, key K, want V) func(got V, loaded bool) {
-	t.Helper()
-	return func(got V, loaded bool) {
-		t.Helper()
-
-		if !loaded {
-			t.Errorf("expected key %v to have been loaded, not stored", key)
-		}
-		if got != want {
-			t.Errorf("expected key %v to have value %v, got %v", key, want, got)
-		}
-	}
-}
-
-func expectStored[K, V comparable](t *testing.T, key K, want V) func(got V, loaded bool) {
-	t.Helper()
-	return func(got V, loaded bool) {
-		t.Helper()
-
-		if loaded {
-			t.Errorf("expected inserted key %v to have been stored, not loaded", key)
-		}
-		if got != want {
-			t.Errorf("expected inserted key %v to have value %v, got %v", key, want, got)
-		}
-	}
-}
-
-func expectDeleted[K, V comparable](t *testing.T, key K, old V) func(deleted bool) {
-	t.Helper()
-	return func(deleted bool) {
-		t.Helper()
-
-		if !deleted {
-			t.Errorf("expected key %v with value %v to be in map and deleted", key, old)
-		}
-	}
-}
-
-func expectNotDeleted[K, V comparable](t *testing.T, key K, old V) func(deleted bool) {
-	t.Helper()
-	return func(deleted bool) {
-		t.Helper()
-
-		if deleted {
-			t.Errorf("expected key %v with value %v to not be in map and thus not deleted", key, old)
-		}
-	}
-}
-
-func testDataMap(data []string) map[string]int {
-	m := make(map[string]int)
-	for i, s := range data {
-		m[s] = i
-	}
-	return m
-}
-
-var (
-	testDataSmall [8]string
-	testData      [128]string
-	testDataLarge [128 << 10]string
-)
-
-func init() {
-	for i := range testDataSmall {
-		testDataSmall[i] = fmt.Sprintf("%b", i)
-	}
-	for i := range testData {
-		testData[i] = fmt.Sprintf("%b", i)
-	}
-	for i := range testDataLarge {
-		testDataLarge[i] = fmt.Sprintf("%b", i)
-	}
-}
-
-func dumpMap[K, V comparable](ht *HashTrieMap[K, V]) {
-	dumpNode(ht, &ht.root.node, 0)
-}
-
-func dumpNode[K, V comparable](ht *HashTrieMap[K, V], n *node[K, V], depth int) {
-	var sb strings.Builder
-	for range depth {
-		fmt.Fprintf(&sb, "\t")
-	}
-	prefix := sb.String()
-	if n.isEntry {
-		e := n.entry()
-		for e != nil {
-			fmt.Printf("%s%p [Entry Key=%v Value=%v Overflow=%p, Hash=%016x]\n", prefix, e, e.key, e.value, e.overflow.Load(), ht.keyHash(unsafe.Pointer(&e.key), ht.seed))
-			e = e.overflow.Load()
-		}
-		return
-	}
-	i := n.indirect()
-	fmt.Printf("%s%p [Indirect Parent=%p Dead=%t Children=[", prefix, i, i.parent, i.dead.Load())
-	for j := range i.children {
-		c := i.children[j].Load()
-		fmt.Printf("%p", c)
-		if j != len(i.children)-1 {
-			fmt.Printf(", ")
-		}
-	}
-	fmt.Printf("]]\n")
-	for j := range i.children {
-		c := i.children[j].Load()
-		if c != nil {
-			dumpNode(ht, c, depth+1)
-		}
-	}
-}
diff --git a/src/internal/copyright/copyright_test.go b/src/internal/copyright/copyright_test.go
new file mode 100644
index 00000000..fa33a944
--- /dev/null
+++ b/src/internal/copyright/copyright_test.go
@@ -0,0 +1,70 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package copyright
+
+import (
+	"bytes"
+	"internal/testenv"
+	"io"
+	"io/fs"
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+var copyright = []byte("Copyright")
+
+var permitted = [][]byte{
+	[]byte("// Code generated by "),
+	[]byte("// Code generated from "),
+	[]byte("// Created by cgo -cdefs"),
+	[]byte("// DO NOT EDIT\n// generated by:"),
+	[]byte("// Empty assembly file"),
+	[]byte("// Generated using cgo"),
+	[]byte("// Original source:\n//\thttp://www.zorinaq.com/papers/md5-amd64.html"), // public domain crypto/md5
+	[]byte("// created by cgo -cdefs"),
+	[]byte("// go run mkasm.go"),
+	[]byte("// mkerrors"),
+	[]byte("// mksys"),
+	[]byte("// run\n// Code generated by"), // cmd/compile/internal/test/constFold_test.go
+}
+
+func TestCopyright(t *testing.T) {
+	buf := make([]byte, 2048)
+	filepath.WalkDir(filepath.Join(testenv.GOROOT(t), "src"), func(path string, d fs.DirEntry, err error) error {
+		if d.IsDir() && (d.Name() == "testdata" || d.Name() == "vendor") {
+			return filepath.SkipDir
+		}
+		switch filepath.Ext(d.Name()) {
+		default:
+			return nil
+		case ".s", ".go":
+			// check
+		}
+
+		f, err := os.Open(path)
+		if err != nil {
+			t.Error(err)
+			return nil
+		}
+		defer f.Close()
+		n, err := f.Read(buf)
+		if err != nil && err != io.EOF {
+			t.Error(err)
+			return nil
+		}
+		b := buf[:n]
+		if bytes.Contains(b, copyright) {
+			return nil
+		}
+		for _, ok := range permitted {
+			if bytes.HasPrefix(b, ok) {
+				return nil
+			}
+		}
+		t.Errorf("%s: missing copyright notice", path)
+		return nil
+	})
+}
diff --git a/src/internal/coverage/cfile/emit.go b/src/internal/coverage/cfile/emit.go
index 3993e9cb..47de7778 100644
--- a/src/internal/coverage/cfile/emit.go
+++ b/src/internal/coverage/cfile/emit.go
@@ -9,8 +9,8 @@
 package cfile
 
 import (
-	"crypto/md5"
 	"fmt"
+	"hash/fnv"
 	"internal/coverage"
 	"internal/coverage/encodecounter"
 	"internal/coverage/encodemeta"
@@ -206,7 +206,7 @@ func prepareForMetaEmit() ([]rtcov.CovMetaBlob, error) {
 		}
 	}
 
-	h := md5.New()
+	h := fnv.New128a()
 	tlen := uint64(unsafe.Sizeof(coverage.MetaFileHeader{}))
 	for _, entry := range ml {
 		if _, err := h.Write(entry.Hash[:]); err != nil {
diff --git a/src/internal/coverage/cfile/testsupport.go b/src/internal/coverage/cfile/testsupport.go
index 3594b32a..adab47fd 100644
--- a/src/internal/coverage/cfile/testsupport.go
+++ b/src/internal/coverage/cfile/testsupport.go
@@ -109,7 +109,7 @@ func ProcessCoverTestDir(dir string, cfile string, cm string, cpkg string, w io.
 
 	// Emit text output.
 	if tf != nil {
-		if err := ts.cf.EmitTextual(tf); err != nil {
+		if err := ts.cf.EmitTextual(selpkgs, tf); err != nil {
 			return err
 		}
 		tfClosed = true
diff --git a/src/internal/coverage/cformat/fmt_test.go b/src/internal/coverage/cformat/fmt_test.go
index d296939d..a26de964 100644
--- a/src/internal/coverage/cformat/fmt_test.go
+++ b/src/internal/coverage/cformat/fmt_test.go
@@ -47,8 +47,8 @@ func TestBasics(t *testing.T) {
 		fm.AddUnit("lit.go", "f3", true, u, 0)
 	}
 
-	var b1, b2, b3, b4 strings.Builder
-	if err := fm.EmitTextual(&b1); err != nil {
+	var b1, b2, b3, b4, b5 strings.Builder
+	if err := fm.EmitTextual(nil, &b1); err != nil {
 		t.Fatalf("EmitTextual returned %v", err)
 	}
 	wantText := strings.TrimSpace(`
@@ -64,6 +64,18 @@ lit.go:99.0,100.0 1 0`)
 		t.Errorf("emit text: got:\n%s\nwant:\n%s\n", gotText, wantText)
 	}
 
+	selected := []string{"my/pack2"}
+	if err := fm.EmitTextual(selected, &b5); err != nil {
+		t.Fatalf("EmitTextual returned %v", err)
+	}
+	wantText = strings.TrimSpace(`
+mode: atomic
+lit.go:99.0,100.0 1 0`)
+	gotText = strings.TrimSpace(b5.String())
+	if wantText != gotText {
+		t.Errorf("emit text: got:\n%s\nwant:\n%s\n", gotText, wantText)
+	}
+
 	// Percent output with no aggregation.
 	noCoverPkg := ""
 	if err := fm.EmitPercent(&b2, nil, noCoverPkg, false, false); err != nil {
diff --git a/src/internal/coverage/cformat/format.go b/src/internal/coverage/cformat/format.go
index 0f9e981d..01d3109e 100644
--- a/src/internal/coverage/cformat/format.go
+++ b/src/internal/coverage/cformat/format.go
@@ -24,7 +24,7 @@ package cformat
 //			}
 //		}
 //		myformatter.EmitPercent(os.Stdout, nil, "", true, true)
-//		myformatter.EmitTextual(somefile)
+//		myformatter.EmitTextual(nil, somefile)
 //
 // These apis are linked into tests that are built with "-cover", and
 // called at the end of test execution to produce text output or
@@ -36,7 +36,9 @@ import (
 	"internal/coverage"
 	"internal/coverage/cmerge"
 	"io"
+	"maps"
 	"slices"
+	"sort"
 	"strings"
 	"text/tabwriter"
 )
@@ -162,25 +164,31 @@ func (p *pstate) sortUnits(units []extcu) {
 	})
 }
 
-// EmitTextual writes the accumulated coverage data in the legacy
-// cmd/cover text format to the writer 'w'. We sort the data items by
+// EmitTextual writes the accumulated coverage data for 'pkgs' in the legacy
+// cmd/cover text format to the writer 'w'; if pkgs is empty, text output
+// is emitted for all packages recorded.  We sort the data items by
 // importpath, source file, and line number before emitting (this sorting
 // is not explicitly mandated by the format, but seems like a good idea
 // for repeatable/deterministic dumps).
-func (fm *Formatter) EmitTextual(w io.Writer) error {
+func (fm *Formatter) EmitTextual(pkgs []string, w io.Writer) error {
 	if fm.cm == coverage.CtrModeInvalid {
 		panic("internal error, counter mode unset")
 	}
+	if len(pkgs) == 0 {
+		pkgs = make([]string, 0, len(fm.pm))
+		for importpath := range fm.pm {
+			pkgs = append(pkgs, importpath)
+		}
+	}
 	if _, err := fmt.Fprintf(w, "mode: %s\n", fm.cm.String()); err != nil {
 		return err
 	}
-	pkgs := make([]string, 0, len(fm.pm))
-	for importpath := range fm.pm {
-		pkgs = append(pkgs, importpath)
-	}
-	slices.Sort(pkgs)
+	sort.Strings(pkgs)
 	for _, importpath := range pkgs {
 		p := fm.pm[importpath]
+		if p == nil {
+			continue
+		}
 		units := make([]extcu, 0, len(p.unitTable))
 		for u := range p.unitTable {
 			units = append(units, u)
@@ -281,14 +289,8 @@ func (fm *Formatter) EmitFuncs(w io.Writer) error {
 	allStmts := uint64(0)
 	covStmts := uint64(0)
 
-	pkgs := make([]string, 0, len(fm.pm))
-	for importpath := range fm.pm {
-		pkgs = append(pkgs, importpath)
-	}
-	slices.Sort(pkgs)
-
 	// Emit functions for each package, sorted by import path.
-	for _, importpath := range pkgs {
+	for _, importpath := range slices.Sorted(maps.Keys(fm.pm)) {
 		p := fm.pm[importpath]
 		if len(p.unitTable) == 0 {
 			continue
diff --git a/src/internal/coverage/decodemeta/decodefile.go b/src/internal/coverage/decodemeta/decodefile.go
index 96e07659..6f4dd1a3 100644
--- a/src/internal/coverage/decodemeta/decodefile.go
+++ b/src/internal/coverage/decodemeta/decodefile.go
@@ -12,9 +12,9 @@ package decodemeta
 
 import (
 	"bufio"
-	"crypto/md5"
 	"encoding/binary"
 	"fmt"
+	"hash/fnv"
 	"internal/coverage"
 	"internal/coverage/slicereader"
 	"internal/coverage/stringtab"
@@ -171,8 +171,10 @@ func (r *CoverageMetaFileReader) FileHash() [16]byte {
 func (r *CoverageMetaFileReader) GetPackageDecoder(pkIdx uint32, payloadbuf []byte) (*CoverageMetaDataDecoder, []byte, error) {
 	pp, err := r.GetPackagePayload(pkIdx, payloadbuf)
 	if r.debug {
+		h := fnv.New128a()
+		h.Write(pp)
 		fmt.Fprintf(os.Stderr, "=-= pkidx=%d payload length is %d hash=%s\n",
-			pkIdx, len(pp), fmt.Sprintf("%x", md5.Sum(pp)))
+			pkIdx, len(pp), fmt.Sprintf("%x", h.Sum(nil)))
 	}
 	if err != nil {
 		return nil, nil, err
diff --git a/src/internal/coverage/encodecounter/encode.go b/src/internal/coverage/encodecounter/encode.go
index d5082701..82fd328f 100644
--- a/src/internal/coverage/encodecounter/encode.go
+++ b/src/internal/coverage/encodecounter/encode.go
@@ -13,6 +13,7 @@ import (
 	"internal/coverage/stringtab"
 	"internal/coverage/uleb128"
 	"io"
+	"maps"
 	"os"
 	"slices"
 )
@@ -122,11 +123,7 @@ func (cfw *CoverageDataWriter) writeSegmentPreamble(args map[string]string, ws *
 	}
 	cfw.csh.StrTabLen = uint32(len(ws.BytesWritten())) - hdrsz
 
-	akeys := make([]string, 0, len(args))
-	for k := range args {
-		akeys = append(akeys, k)
-	}
-	slices.Sort(akeys)
+	akeys := slices.Sorted(maps.Keys(args))
 
 	wrULEB128 := func(v uint) error {
 		cfw.tmp = cfw.tmp[:0]
diff --git a/src/internal/coverage/encodemeta/encode.go b/src/internal/coverage/encodemeta/encode.go
index 549b3f55..e8f70fe5 100644
--- a/src/internal/coverage/encodemeta/encode.go
+++ b/src/internal/coverage/encodemeta/encode.go
@@ -10,10 +10,10 @@ package encodemeta
 
 import (
 	"bytes"
-	"crypto/md5"
 	"encoding/binary"
 	"fmt"
 	"hash"
+	"hash/fnv"
 	"internal/coverage"
 	"internal/coverage/stringtab"
 	"internal/coverage/uleb128"
@@ -39,7 +39,7 @@ func NewCoverageMetaDataBuilder(pkgpath string, pkgname string, modulepath strin
 	}
 	x := &CoverageMetaDataBuilder{
 		tmp: make([]byte, 0, 256),
-		h:   md5.New(),
+		h:   fnv.New128a(),
 	}
 	x.stab.InitWriter()
 	x.stab.Lookup("")
@@ -188,7 +188,7 @@ func (b *CoverageMetaDataBuilder) Emit(w io.WriteSeeker) ([16]byte, error) {
 // HashFuncDesc computes an md5 sum of a coverage.FuncDesc and returns
 // a digest for it.
 func HashFuncDesc(f *coverage.FuncDesc) [16]byte {
-	h := md5.New()
+	h := fnv.New128a()
 	tmp := make([]byte, 0, 32)
 	hashFuncDesc(h, f, tmp)
 	var r [16]byte
diff --git a/src/internal/coverage/encodemeta/encodefile.go b/src/internal/coverage/encodemeta/encodefile.go
index 38ae46e4..ae7c23ad 100644
--- a/src/internal/coverage/encodemeta/encodefile.go
+++ b/src/internal/coverage/encodemeta/encodefile.go
@@ -6,9 +6,9 @@ package encodemeta
 
 import (
 	"bufio"
-	"crypto/md5"
 	"encoding/binary"
 	"fmt"
+	"hash/fnv"
 	"internal/coverage"
 	"internal/coverage/stringtab"
 	"io"
@@ -112,7 +112,9 @@ func (m *CoverageMetaFileWriter) Write(finalHash [16]byte, blobs [][]byte, mode
 	// Now emit blobs themselves.
 	for k, blob := range blobs {
 		if m.debug {
-			fmt.Fprintf(os.Stderr, "=+= writing blob %d len %d at off=%d hash %s\n", k, len(blob), off2, fmt.Sprintf("%x", md5.Sum(blob)))
+			h := fnv.New128a()
+			h.Write(blob)
+			fmt.Fprintf(os.Stderr, "=+= writing blob %d len %d at off=%d hash %s\n", k, len(blob), off2, fmt.Sprintf("%x", h.Sum(nil)))
 		}
 		if _, err = m.w.Write(blob); err != nil {
 			return fmt.Errorf("error writing %s: %v", m.mfname, err)
diff --git a/src/internal/coverage/pkid.go b/src/internal/coverage/pkid.go
index 86ff3025..f68523a3 100644
--- a/src/internal/coverage/pkid.go
+++ b/src/internal/coverage/pkid.go
@@ -26,9 +26,9 @@ package coverage
 //    slot: 1 path='internal/goarch'  hard-coded id: 2
 //    slot: 2 path='internal/runtime/atomic'  hard-coded id: 3
 //    slot: 3 path='internal/goos'
-//    slot: 4 path='runtime/internal/sys'  hard-coded id: 5
+//    slot: 4 path='internal/runtime/sys'  hard-coded id: 5
 //    slot: 5 path='internal/abi'  hard-coded id: 4
-//    slot: 6 path='runtime/internal/math'  hard-coded id: 6
+//    slot: 6 path='internal/runtime/math'  hard-coded id: 6
 //    slot: 7 path='internal/bytealg'  hard-coded id: 7
 //    slot: 8 path='internal/goexperiment'
 //    slot: 9 path='internal/runtime/syscall'  hard-coded id: 8
@@ -50,12 +50,14 @@ var rtPkgs = [...]string{
 	"internal/runtime/atomic",
 	"internal/goos",
 	"internal/chacha8rand",
-	"runtime/internal/sys",
+	"internal/runtime/sys",
 	"internal/abi",
-	"runtime/internal/math",
+	"internal/runtime/maps",
+	"internal/runtime/math",
 	"internal/bytealg",
 	"internal/goexperiment",
 	"internal/runtime/syscall",
+	"internal/stringslite",
 	"runtime",
 }
 
diff --git a/src/internal/coverage/pods/pods_test.go b/src/internal/coverage/pods/pods_test.go
index 69c16e00..eed01698 100644
--- a/src/internal/coverage/pods/pods_test.go
+++ b/src/internal/coverage/pods/pods_test.go
@@ -5,8 +5,8 @@
 package pods_test
 
 import (
-	"crypto/md5"
 	"fmt"
+	"hash/fnv"
 	"internal/coverage"
 	"internal/coverage/pods"
 	"os"
@@ -35,13 +35,17 @@ func TestPodCollection(t *testing.T) {
 	}
 
 	mkmeta := func(dir string, tag string) string {
-		hash := md5.Sum([]byte(tag))
+		h := fnv.New128a()
+		h.Write([]byte(tag))
+		hash := h.Sum(nil)
 		fn := fmt.Sprintf("%s.%x", coverage.MetaFilePref, hash)
 		return mkfile(dir, fn)
 	}
 
 	mkcounter := func(dir string, tag string, nt int, pid int) string {
-		hash := md5.Sum([]byte(tag))
+		h := fnv.New128a()
+		h.Write([]byte(tag))
+		hash := h.Sum(nil)
 		fn := fmt.Sprintf(coverage.CounterFileTempl, coverage.CounterFilePref, hash, pid, nt)
 		return mkfile(dir, fn)
 	}
@@ -112,16 +116,16 @@ func TestPodCollection(t *testing.T) {
 	}
 
 	expected := []string{
-		`o1/covmeta.ae7be26cdaa742ca148068d5ac90eaca [
-o1/covcounters.ae7be26cdaa742ca148068d5ac90eaca.40.2 o:0
-o1/covcounters.ae7be26cdaa742ca148068d5ac90eaca.41.2 o:0
-o1/covcounters.ae7be26cdaa742ca148068d5ac90eaca.42.1 o:0
-o2/covcounters.ae7be26cdaa742ca148068d5ac90eaca.35.11 o:1
+		`o1/covmeta.0880952782ab1be95aa0733055a4d06b [
+o1/covcounters.0880952782ab1be95aa0733055a4d06b.40.2 o:0
+o1/covcounters.0880952782ab1be95aa0733055a4d06b.41.2 o:0
+o1/covcounters.0880952782ab1be95aa0733055a4d06b.42.1 o:0
+o2/covcounters.0880952782ab1be95aa0733055a4d06b.35.11 o:1
 ]`,
-		`o2/covmeta.aaf2f89992379705dac844c0a2a1d45f [
-o2/covcounters.aaf2f89992379705dac844c0a2a1d45f.36.3 o:1
-o2/covcounters.aaf2f89992379705dac844c0a2a1d45f.37.2 o:1
-o2/covcounters.aaf2f89992379705dac844c0a2a1d45f.38.1 o:1
+		`o2/covmeta.0880952783ab1be95aa0733055a4d1a6 [
+o2/covcounters.0880952783ab1be95aa0733055a4d1a6.36.3 o:1
+o2/covcounters.0880952783ab1be95aa0733055a4d1a6.37.2 o:1
+o2/covcounters.0880952783ab1be95aa0733055a4d1a6.38.1 o:1
 ]`,
 	}
 	for k, exp := range expected {
diff --git a/src/internal/cpu/cpu.go b/src/internal/cpu/cpu.go
index 9be280c6..cd3db105 100644
--- a/src/internal/cpu/cpu.go
+++ b/src/internal/cpu/cpu.go
@@ -37,6 +37,7 @@ var X86 struct {
 	HasBMI1      bool
 	HasBMI2      bool
 	HasERMS      bool
+	HasFSRM      bool
 	HasFMA       bool
 	HasOSXSAVE   bool
 	HasPCLMULQDQ bool
@@ -72,10 +73,22 @@ var ARM64 struct {
 	HasCRC32   bool
 	HasATOMICS bool
 	HasCPUID   bool
+	HasDIT     bool
 	IsNeoverse bool
 	_          CacheLinePad
 }
 
+// The booleans in Loong64 contain the correspondingly named cpu feature bit.
+// The struct is padded to avoid false sharing.
+var Loong64 struct {
+	_         CacheLinePad
+	HasLSX    bool // support 128-bit vector extension
+	HasCRC32  bool // support CRC instruction
+	HasLAMCAS bool // support AMCAS[_DB].{B/H/W/D}
+	HasLAM_BH bool // support AM{SWAP/ADD}[_DB].{B/H} instruction
+	_         CacheLinePad
+}
+
 var MIPS64X struct {
 	_      CacheLinePad
 	HasMSA bool // MIPS SIMD architecture
@@ -127,6 +140,7 @@ var S390X struct {
 //go:linkname X86
 //go:linkname ARM
 //go:linkname ARM64
+//go:linkname Loong64
 //go:linkname MIPS64X
 //go:linkname PPC64
 //go:linkname S390X
diff --git a/src/internal/cpu/cpu_arm64.go b/src/internal/cpu/cpu_arm64.go
index 4a302f27..1365991e 100644
--- a/src/internal/cpu/cpu_arm64.go
+++ b/src/internal/cpu/cpu_arm64.go
@@ -28,13 +28,15 @@ func doinit() {
 
 func getisar0() uint64
 
+func getpfr0() uint64
+
 func getMIDR() uint64
 
 func extractBits(data uint64, start, end uint) uint {
 	return (uint)(data>>start) & ((1 << (end - start + 1)) - 1)
 }
 
-func parseARM64SystemRegisters(isar0 uint64) {
+func parseARM64SystemRegisters(isar0, pfr0 uint64) {
 	// ID_AA64ISAR0_EL1
 	switch extractBits(isar0, 4, 7) {
 	case 1:
@@ -66,4 +68,9 @@ func parseARM64SystemRegisters(isar0 uint64) {
 	case 2:
 		ARM64.HasATOMICS = true
 	}
+
+	switch extractBits(pfr0, 48, 51) {
+	case 1:
+		ARM64.HasDIT = true
+	}
 }
diff --git a/src/internal/cpu/cpu_arm64.s b/src/internal/cpu/cpu_arm64.s
index d6e7f443..96075610 100644
--- a/src/internal/cpu/cpu_arm64.s
+++ b/src/internal/cpu/cpu_arm64.s
@@ -11,6 +11,13 @@ TEXT ·getisar0(SB),NOSPLIT,$0
 	MOVD	R0, ret+0(FP)
 	RET
 
+// func getpfr0() uint64
+TEXT ·getpfr0(SB),NOSPLIT,$0-8
+	// get Processor Feature Register 0 into R0
+	MRS ID_AA64PFR0_EL1, R0
+	MOVD R0, ret+0(FP)
+	RET
+
 // func getMIDR() uint64
 TEXT ·getMIDR(SB), NOSPLIT, $0-8
 	MRS	MIDR_EL1, R0
diff --git a/src/internal/cpu/cpu_arm64_darwin.go b/src/internal/cpu/cpu_arm64_darwin.go
index 2507780e..57cf631e 100644
--- a/src/internal/cpu/cpu_arm64_darwin.go
+++ b/src/internal/cpu/cpu_arm64_darwin.go
@@ -12,6 +12,7 @@ func osInit() {
 	ARM64.HasATOMICS = sysctlEnabled([]byte("hw.optional.armv8_1_atomics\x00"))
 	ARM64.HasCRC32 = sysctlEnabled([]byte("hw.optional.armv8_crc32\x00"))
 	ARM64.HasSHA512 = sysctlEnabled([]byte("hw.optional.armv8_2_sha512\x00"))
+	ARM64.HasDIT = sysctlEnabled([]byte("hw.optional.arm.FEAT_DIT\x00"))
 
 	// There are no hw.optional sysctl values for the below features on Mac OS 11.0
 	// to detect their supported state dynamically. Assume the CPU features that
diff --git a/src/internal/cpu/cpu_arm64_freebsd.go b/src/internal/cpu/cpu_arm64_freebsd.go
index 96ed359c..c339e6f2 100644
--- a/src/internal/cpu/cpu_arm64_freebsd.go
+++ b/src/internal/cpu/cpu_arm64_freebsd.go
@@ -9,6 +9,7 @@ package cpu
 func osInit() {
 	// Retrieve info from system register ID_AA64ISAR0_EL1.
 	isar0 := getisar0()
+	prf0 := getpfr0()
 
-	parseARM64SystemRegisters(isar0)
+	parseARM64SystemRegisters(isar0, prf0)
 }
diff --git a/src/internal/cpu/cpu_arm64_hwcap.go b/src/internal/cpu/cpu_arm64_hwcap.go
index 34edf3ee..cdc1d89c 100644
--- a/src/internal/cpu/cpu_arm64_hwcap.go
+++ b/src/internal/cpu/cpu_arm64_hwcap.go
@@ -31,6 +31,7 @@ const (
 	hwcap_ATOMICS = 1 << 8
 	hwcap_CPUID   = 1 << 11
 	hwcap_SHA512  = 1 << 21
+	hwcap_DIT     = 1 << 24
 )
 
 func hwcapInit(os string) {
@@ -44,6 +45,7 @@ func hwcapInit(os string) {
 	ARM64.HasCRC32 = isSet(HWCap, hwcap_CRC32)
 	ARM64.HasCPUID = isSet(HWCap, hwcap_CPUID)
 	ARM64.HasSHA512 = isSet(HWCap, hwcap_SHA512)
+	ARM64.HasDIT = isSet(HWCap, hwcap_DIT)
 
 	// The Samsung S9+ kernel reports support for atomics, but not all cores
 	// actually support them, resulting in SIGILL. See issue #28431.
diff --git a/src/internal/cpu/cpu_arm64_openbsd.go b/src/internal/cpu/cpu_arm64_openbsd.go
index 12593098..6cc69c95 100644
--- a/src/internal/cpu/cpu_arm64_openbsd.go
+++ b/src/internal/cpu/cpu_arm64_openbsd.go
@@ -13,6 +13,7 @@ const (
 	// From OpenBSD's machine/cpu.h.
 	_CPU_ID_AA64ISAR0 = 2
 	_CPU_ID_AA64ISAR1 = 3
+	_CPU_ID_AA64PFR0  = 8
 )
 
 //go:noescape
@@ -24,5 +25,11 @@ func osInit() {
 	if !ok {
 		return
 	}
-	parseARM64SystemRegisters(isar0)
+	// Get ID_AA64PFR0 from sysctl.
+	pfr0, ok := sysctlUint64([]uint32{_CTL_MACHDEP, _CPU_ID_AA64PFR0})
+	if !ok {
+		return
+	}
+
+	parseARM64SystemRegisters(isar0, pfr0)
 }
diff --git a/src/internal/cpu/cpu_loong64.go b/src/internal/cpu/cpu_loong64.go
index 1c90c24f..92583d0b 100644
--- a/src/internal/cpu/cpu_loong64.go
+++ b/src/internal/cpu/cpu_loong64.go
@@ -10,4 +10,45 @@ package cpu
 // We choose 64 because Loongson 3A5000 the L1 Dcache is 4-way 256-line 64-byte-per-line.
 const CacheLinePadSize = 64
 
-func doinit() {}
+// Bit fields for CPUCFG registers, Related reference documents:
+// https://loongson.github.io/LoongArch-Documentation/LoongArch-Vol1-EN.html#_cpucfg
+const (
+	// CPUCFG1 bits
+	cpucfg1_CRC32 = 1 << 25
+
+	// CPUCFG2 bits
+	cpucfg2_LAM_BH = 1 << 27
+	cpucfg2_LAMCAS = 1 << 28
+)
+
+// get_cpucfg is implemented in cpu_loong64.s.
+func get_cpucfg(reg uint32) uint32
+
+func doinit() {
+	options = []option{
+		{Name: "lsx", Feature: &Loong64.HasLSX},
+		{Name: "crc32", Feature: &Loong64.HasCRC32},
+		{Name: "lamcas", Feature: &Loong64.HasLAMCAS},
+		{Name: "lam_bh", Feature: &Loong64.HasLAM_BH},
+	}
+
+	// The CPUCFG data on Loong64 only reflects the hardware capabilities,
+	// not the kernel support status, so features such as LSX and LASX that
+	// require kernel support cannot be obtained from the CPUCFG data.
+	//
+	// These features only require hardware capability support and do not
+	// require kernel specific support, so they can be obtained directly
+	// through CPUCFG
+	cfg1 := get_cpucfg(1)
+	cfg2 := get_cpucfg(2)
+
+	Loong64.HasCRC32 = cfgIsSet(cfg1, cpucfg1_CRC32)
+	Loong64.HasLAMCAS = cfgIsSet(cfg2, cpucfg2_LAM_BH)
+	Loong64.HasLAM_BH = cfgIsSet(cfg2, cpucfg2_LAMCAS)
+
+	osInit()
+}
+
+func cfgIsSet(cfg uint32, val uint32) bool {
+	return cfg&val != 0
+}
diff --git a/src/internal/cpu/cpu_loong64.s b/src/internal/cpu/cpu_loong64.s
new file mode 100644
index 00000000..f02a2780
--- /dev/null
+++ b/src/internal/cpu/cpu_loong64.s
@@ -0,0 +1,12 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "textflag.h"
+
+// func get_cpucfg(reg uint32) uint32
+TEXT ·get_cpucfg(SB), NOSPLIT|NOFRAME, $0-12
+	MOVW	reg+0(FP), R5
+	CPUCFG	R5, R4
+	MOVW	R4, ret+8(FP)
+	RET
diff --git a/src/internal/cpu/cpu_loong64_hwcap.go b/src/internal/cpu/cpu_loong64_hwcap.go
new file mode 100644
index 00000000..58397ada
--- /dev/null
+++ b/src/internal/cpu/cpu_loong64_hwcap.go
@@ -0,0 +1,26 @@
+// Copyright 2023 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build loong64 && linux
+
+package cpu
+
+// This is initialized by archauxv and should not be changed after it is
+// initialized.
+var HWCap uint
+
+// HWCAP bits. These are exposed by the Linux kernel.
+const (
+	hwcap_LOONGARCH_LSX = 1 << 4
+)
+
+func hwcapInit() {
+	// TODO: Features that require kernel support like LSX and LASX can
+	// be detected here once needed in std library or by the compiler.
+	Loong64.HasLSX = hwcIsSet(HWCap, hwcap_LOONGARCH_LSX)
+}
+
+func hwcIsSet(hwc uint, val uint) bool {
+	return hwc&val != 0
+}
diff --git a/src/internal/cpu/cpu_loong64_linux.go b/src/internal/cpu/cpu_loong64_linux.go
new file mode 100644
index 00000000..73bc384a
--- /dev/null
+++ b/src/internal/cpu/cpu_loong64_linux.go
@@ -0,0 +1,11 @@
+// Copyright 2023 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build loong64 && linux
+
+package cpu
+
+func osInit() {
+	hwcapInit()
+}
diff --git a/src/internal/cpu/cpu_x86.go b/src/internal/cpu/cpu_x86.go
index 2b629d4d..ee812076 100644
--- a/src/internal/cpu/cpu_x86.go
+++ b/src/internal/cpu/cpu_x86.go
@@ -40,7 +40,8 @@ const (
 	cpuid_SHA      = 1 << 29
 	cpuid_AVX512BW = 1 << 30
 	cpuid_AVX512VL = 1 << 31
-
+	// edx bits
+	cpuid_FSRM = 1 << 4
 	// edx bits for CPUID 0x80000001
 	cpuid_RDTSCP = 1 << 27
 )
@@ -52,6 +53,7 @@ func doinit() {
 		{Name: "adx", Feature: &X86.HasADX},
 		{Name: "aes", Feature: &X86.HasAES},
 		{Name: "erms", Feature: &X86.HasERMS},
+		{Name: "fsrm", Feature: &X86.HasFSRM},
 		{Name: "pclmulqdq", Feature: &X86.HasPCLMULQDQ},
 		{Name: "rdtscp", Feature: &X86.HasRDTSCP},
 		{Name: "sha", Feature: &X86.HasSHA},
@@ -137,7 +139,7 @@ func doinit() {
 		return
 	}
 
-	_, ebx7, _, _ := cpuid(7, 0)
+	_, ebx7, _, edx7 := cpuid(7, 0)
 	X86.HasBMI1 = isSet(ebx7, cpuid_BMI1)
 	X86.HasAVX2 = isSet(ebx7, cpuid_AVX2) && osSupportsAVX
 	X86.HasBMI2 = isSet(ebx7, cpuid_BMI2)
@@ -151,6 +153,8 @@ func doinit() {
 		X86.HasAVX512VL = isSet(ebx7, cpuid_AVX512VL)
 	}
 
+	X86.HasFSRM = isSet(edx7, cpuid_FSRM)
+
 	var maxExtendedInformation uint32
 	maxExtendedInformation, _, _, _ = cpuid(0x80000000, 0)
 
diff --git a/src/internal/dag/alg_test.go b/src/internal/dag/alg_test.go
index e5ea8b6a..0659eb18 100644
--- a/src/internal/dag/alg_test.go
+++ b/src/internal/dag/alg_test.go
@@ -5,7 +5,7 @@
 package dag
 
 import (
-	"reflect"
+	"slices"
 	"strings"
 	"testing"
 )
@@ -26,7 +26,7 @@ func TestTopo(t *testing.T) {
 	//
 	// "a" is a leaf.
 	wantNodes := strings.Fields("d c b a")
-	if !reflect.DeepEqual(wantNodes, got) {
+	if !slices.Equal(wantNodes, got) {
 		t.Fatalf("want topo sort %v, got %v", wantNodes, got)
 	}
 }
diff --git a/src/internal/dag/parse_test.go b/src/internal/dag/parse_test.go
index b2520c36..dda304ad 100644
--- a/src/internal/dag/parse_test.go
+++ b/src/internal/dag/parse_test.go
@@ -5,7 +5,7 @@
 package dag
 
 import (
-	"reflect"
+	"slices"
 	"strings"
 	"testing"
 )
@@ -52,7 +52,7 @@ func TestParse(t *testing.T) {
 	g := mustParse(t, diamond)
 
 	wantNodes := strings.Fields("a b c d")
-	if !reflect.DeepEqual(wantNodes, g.Nodes) {
+	if !slices.Equal(wantNodes, g.Nodes) {
 		t.Fatalf("want nodes %v, got %v", wantNodes, g.Nodes)
 	}
 
diff --git a/src/internal/exportdata/exportdata.go b/src/internal/exportdata/exportdata.go
new file mode 100644
index 00000000..861a47f4
--- /dev/null
+++ b/src/internal/exportdata/exportdata.go
@@ -0,0 +1,355 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package exportdata implements common utilities for finding
+// and reading gc-generated object files.
+package exportdata
+
+// This file should be kept in sync with src/cmd/compile/internal/gc/obj.go .
+
+import (
+	"bufio"
+	"bytes"
+	"errors"
+	"fmt"
+	"go/build"
+	"internal/saferio"
+	"io"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+	"sync"
+)
+
+// ReadUnified reads the contents of the unified export data from a reader r
+// that contains the contents of a GC-created archive file.
+//
+// On success, the reader will be positioned after the end-of-section marker "\n$$\n".
+//
+// Supported GC-created archive files have 4 layers of nesting:
+//   - An archive file containing a package definition file.
+//   - The package definition file contains headers followed by a data section.
+//     Headers are lines (≤ 4kb) that do not start with "$$".
+//   - The data section starts with "$$B\n" followed by export data followed
+//     by an end of section marker "\n$$\n". (The section start "$$\n" is no
+//     longer supported.)
+//   - The export data starts with a format byte ('u') followed by the  in
+//     the given format. (See ReadExportDataHeader for older formats.)
+//
+// Putting this together, the bytes in a GC-created archive files are expected
+// to look like the following.
+// See cmd/internal/archive for more details on ar file headers.
+//
+// | \n             | ar file signature
+// | __.PKGDEF...size...\n | ar header for __.PKGDEF including size.
+// | go object <...>\n     | objabi header
+// | \n  | other headers such as build id
+// | $$B\n                 | binary format marker
+// | u\n             | unified export 
+// | $$\n                  | end-of-section marker
+// | [optional padding]    | padding byte (0x0A) if size is odd
+// | [ar file header]      | other ar files
+// | [ar file data]        |
+func ReadUnified(r *bufio.Reader) (data []byte, err error) {
+	// We historically guaranteed headers at the default buffer size (4096) work.
+	// This ensures we can use ReadSlice throughout.
+	const minBufferSize = 4096
+	r = bufio.NewReaderSize(r, minBufferSize)
+
+	size, err := FindPackageDefinition(r)
+	if err != nil {
+		return
+	}
+	n := size
+
+	objapi, headers, err := ReadObjectHeaders(r)
+	if err != nil {
+		return
+	}
+	n -= len(objapi)
+	for _, h := range headers {
+		n -= len(h)
+	}
+
+	hdrlen, err := ReadExportDataHeader(r)
+	if err != nil {
+		return
+	}
+	n -= hdrlen
+
+	// size also includes the end of section marker. Remove that many bytes from the end.
+	const marker = "\n$$\n"
+	n -= len(marker)
+
+	if n < 0 {
+		err = fmt.Errorf("invalid size (%d) in the archive file: %d bytes remain without section headers (recompile package)", size, n)
+		return
+	}
+
+	// Read n bytes from buf.
+	data, err = saferio.ReadData(r, uint64(n))
+	if err != nil {
+		return
+	}
+
+	// Check for marker at the end.
+	var suffix [len(marker)]byte
+	_, err = io.ReadFull(r, suffix[:])
+	if err != nil {
+		return
+	}
+	if s := string(suffix[:]); s != marker {
+		err = fmt.Errorf("read %q instead of end-of-section marker (%q)", s, marker)
+		return
+	}
+
+	return
+}
+
+// FindPackageDefinition positions the reader r at the beginning of a package
+// definition file ("__.PKGDEF") within a GC-created archive by reading
+// from it, and returns the size of the package definition file in the archive.
+//
+// The reader must be positioned at the start of the archive file before calling
+// this function, and "__.PKGDEF" is assumed to be the first file in the archive.
+//
+// See cmd/internal/archive for details on the archive format.
+func FindPackageDefinition(r *bufio.Reader) (size int, err error) {
+	// Uses ReadSlice to limit risk of malformed inputs.
+
+	// Read first line to make sure this is an object file.
+	line, err := r.ReadSlice('\n')
+	if err != nil {
+		err = fmt.Errorf("can't find export data (%v)", err)
+		return
+	}
+
+	// Is the first line an archive file signature?
+	if string(line) != "!\n" {
+		err = fmt.Errorf("not the start of an archive file (%q)", line)
+		return
+	}
+
+	// package export block should be first
+	size = readArchiveHeader(r, "__.PKGDEF")
+	if size <= 0 {
+		err = fmt.Errorf("not a package file")
+		return
+	}
+
+	return
+}
+
+// ReadObjectHeaders reads object headers from the reader. Object headers are
+// lines that do not start with an end-of-section marker "$$". The first header
+// is the objabi header. On success, the reader will be positioned at the beginning
+// of the end-of-section marker.
+//
+// It returns an error if any header does not fit in r.Size() bytes.
+func ReadObjectHeaders(r *bufio.Reader) (objapi string, headers []string, err error) {
+	// line is a temporary buffer for headers.
+	// Use bounded reads (ReadSlice, Peek) to limit risk of malformed inputs.
+	var line []byte
+
+	// objapi header should be the first line
+	if line, err = r.ReadSlice('\n'); err != nil {
+		err = fmt.Errorf("can't find export data (%v)", err)
+		return
+	}
+	objapi = string(line)
+
+	// objapi header begins with "go object ".
+	if !strings.HasPrefix(objapi, "go object ") {
+		err = fmt.Errorf("not a go object file: %s", objapi)
+		return
+	}
+
+	// process remaining object header lines
+	for {
+		// check for an end of section marker "$$"
+		line, err = r.Peek(2)
+		if err != nil {
+			return
+		}
+		if string(line) == "$$" {
+			return // stop
+		}
+
+		// read next header
+		line, err = r.ReadSlice('\n')
+		if err != nil {
+			return
+		}
+		headers = append(headers, string(line))
+	}
+}
+
+// ReadExportDataHeader reads the export data header and format from r.
+// It returns the number of bytes read, or an error if the format is no longer
+// supported or it failed to read.
+//
+// The only currently supported format is binary export data in the
+// unified export format.
+func ReadExportDataHeader(r *bufio.Reader) (n int, err error) {
+	// Read export data header.
+	line, err := r.ReadSlice('\n')
+	if err != nil {
+		return
+	}
+
+	hdr := string(line)
+	switch hdr {
+	case "$$\n":
+		err = fmt.Errorf("old textual export format no longer supported (recompile package)")
+		return
+
+	case "$$B\n":
+		var format byte
+		format, err = r.ReadByte()
+		if err != nil {
+			return
+		}
+		// The unified export format starts with a 'u'.
+		switch format {
+		case 'u':
+		default:
+			// Older no longer supported export formats include:
+			// indexed export format which started with an 'i'; and
+			// the older binary export format which started with a 'c',
+			// 'd', or 'v' (from "version").
+			err = fmt.Errorf("binary export format %q is no longer supported (recompile package)", format)
+			return
+		}
+
+	default:
+		err = fmt.Errorf("unknown export data header: %q", hdr)
+		return
+	}
+
+	n = len(hdr) + 1 // + 1 is for 'u'
+	return
+}
+
+// FindPkg returns the filename and unique package id for an import
+// path based on package information provided by build.Import (using
+// the build.Default build.Context). A relative srcDir is interpreted
+// relative to the current working directory.
+func FindPkg(path, srcDir string) (filename, id string, err error) {
+	if path == "" {
+		return "", "", errors.New("path is empty")
+	}
+
+	var noext string
+	switch {
+	default:
+		// "x" -> "$GOPATH/pkg/$GOOS_$GOARCH/x.ext", "x"
+		// Don't require the source files to be present.
+		if abs, err := filepath.Abs(srcDir); err == nil { // see issue 14282
+			srcDir = abs
+		}
+		var bp *build.Package
+		bp, err = build.Import(path, srcDir, build.FindOnly|build.AllowBinary)
+		if bp.PkgObj == "" {
+			if bp.Goroot && bp.Dir != "" {
+				filename, err = lookupGorootExport(bp.Dir)
+				if err == nil {
+					_, err = os.Stat(filename)
+				}
+				if err == nil {
+					return filename, bp.ImportPath, nil
+				}
+			}
+			goto notfound
+		} else {
+			noext = strings.TrimSuffix(bp.PkgObj, ".a")
+		}
+		id = bp.ImportPath
+
+	case build.IsLocalImport(path):
+		// "./x" -> "/this/directory/x.ext", "/this/directory/x"
+		noext = filepath.Join(srcDir, path)
+		id = noext
+
+	case filepath.IsAbs(path):
+		// for completeness only - go/build.Import
+		// does not support absolute imports
+		// "/x" -> "/x.ext", "/x"
+		noext = path
+		id = path
+	}
+
+	if false { // for debugging
+		if path != id {
+			fmt.Printf("%s -> %s\n", path, id)
+		}
+	}
+
+	// try extensions
+	for _, ext := range pkgExts {
+		filename = noext + ext
+		f, statErr := os.Stat(filename)
+		if statErr == nil && !f.IsDir() {
+			return filename, id, nil
+		}
+		if err == nil {
+			err = statErr
+		}
+	}
+
+notfound:
+	if err == nil {
+		return "", path, fmt.Errorf("can't find import: %q", path)
+	}
+	return "", path, fmt.Errorf("can't find import: %q: %w", path, err)
+}
+
+var pkgExts = [...]string{".a", ".o"} // a file from the build cache will have no extension
+
+var exportMap sync.Map // package dir → func() (string, error)
+
+// lookupGorootExport returns the location of the export data
+// (normally found in the build cache, but located in GOROOT/pkg
+// in prior Go releases) for the package located in pkgDir.
+//
+// (We use the package's directory instead of its import path
+// mainly to simplify handling of the packages in src/vendor
+// and cmd/vendor.)
+func lookupGorootExport(pkgDir string) (string, error) {
+	f, ok := exportMap.Load(pkgDir)
+	if !ok {
+		var (
+			listOnce   sync.Once
+			exportPath string
+			err        error
+		)
+		f, _ = exportMap.LoadOrStore(pkgDir, func() (string, error) {
+			listOnce.Do(func() {
+				cmd := exec.Command(filepath.Join(build.Default.GOROOT, "bin", "go"), "list", "-export", "-f", "{{.Export}}", pkgDir)
+				cmd.Dir = build.Default.GOROOT
+				cmd.Env = append(os.Environ(), "PWD="+cmd.Dir, "GOROOT="+build.Default.GOROOT)
+				var output []byte
+				output, err = cmd.Output()
+				if err != nil {
+					if ee, ok := err.(*exec.ExitError); ok && len(ee.Stderr) > 0 {
+						err = errors.New(string(ee.Stderr))
+					}
+					return
+				}
+
+				exports := strings.Split(string(bytes.TrimSpace(output)), "\n")
+				if len(exports) != 1 {
+					err = fmt.Errorf("go list reported %d exports; expected 1", len(exports))
+					return
+				}
+
+				exportPath = exports[0]
+			})
+
+			return exportPath, err
+		})
+	}
+
+	return f.(func() (string, error))()
+}
diff --git a/src/internal/exportdata/support.go b/src/internal/exportdata/support.go
new file mode 100644
index 00000000..a06401db
--- /dev/null
+++ b/src/internal/exportdata/support.go
@@ -0,0 +1,32 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// This file contains support functions for exportdata.
+
+package exportdata
+
+import (
+	"bufio"
+	"io"
+	"strconv"
+	"strings"
+)
+
+// Copy of cmd/internal/archive.ReadHeader.
+func readArchiveHeader(b *bufio.Reader, name string) int {
+	// architecture-independent object file output
+	const HeaderSize = 60
+
+	var buf [HeaderSize]byte
+	if _, err := io.ReadFull(b, buf[:]); err != nil {
+		return -1
+	}
+	aname := strings.Trim(string(buf[0:16]), " ")
+	if !strings.HasPrefix(aname, name) {
+		return -1
+	}
+	asize := strings.Trim(string(buf[48:58]), " ")
+	i, _ := strconv.Atoi(asize)
+	return i
+}
diff --git a/src/internal/fuzz/mutators_byteslice_test.go b/src/internal/fuzz/mutators_byteslice_test.go
index 78869678..b12ef6cb 100644
--- a/src/internal/fuzz/mutators_byteslice_test.go
+++ b/src/internal/fuzz/mutators_byteslice_test.go
@@ -6,6 +6,7 @@ package fuzz
 
 import (
 	"bytes"
+	"fmt"
 	"testing"
 )
 
@@ -33,12 +34,6 @@ func (mr *mockRand) uint32n(n uint32) uint32 {
 	return uint32(c) % n
 }
 
-func (mr *mockRand) exp2() int {
-	c := mr.values[mr.counter]
-	mr.counter++
-	return c
-}
-
 func (mr *mockRand) bool() bool {
 	b := mr.b
 	mr.b = !mr.b
@@ -184,3 +179,43 @@ func TestByteSliceMutators(t *testing.T) {
 		})
 	}
 }
+
+func BenchmarkByteSliceMutators(b *testing.B) {
+	tests := [...]struct {
+		name    string
+		mutator func(*mutator, []byte) []byte
+	}{
+		{"RemoveBytes", byteSliceRemoveBytes},
+		{"InsertRandomBytes", byteSliceInsertRandomBytes},
+		{"DuplicateBytes", byteSliceDuplicateBytes},
+		{"OverwriteBytes", byteSliceOverwriteBytes},
+		{"BitFlip", byteSliceBitFlip},
+		{"XORByte", byteSliceXORByte},
+		{"SwapByte", byteSliceSwapByte},
+		{"ArithmeticUint8", byteSliceArithmeticUint8},
+		{"ArithmeticUint16", byteSliceArithmeticUint16},
+		{"ArithmeticUint32", byteSliceArithmeticUint32},
+		{"ArithmeticUint64", byteSliceArithmeticUint64},
+		{"OverwriteInterestingUint8", byteSliceOverwriteInterestingUint8},
+		{"OverwriteInterestingUint16", byteSliceOverwriteInterestingUint16},
+		{"OverwriteInterestingUint32", byteSliceOverwriteInterestingUint32},
+		{"InsertConstantBytes", byteSliceInsertConstantBytes},
+		{"OverwriteConstantBytes", byteSliceOverwriteConstantBytes},
+		{"ShuffleBytes", byteSliceShuffleBytes},
+		{"SwapBytes", byteSliceSwapBytes},
+	}
+
+	for _, tc := range tests {
+		b.Run(tc.name, func(b *testing.B) {
+			for size := 64; size <= 1024; size *= 2 {
+				b.Run(fmt.Sprintf("%d", size), func(b *testing.B) {
+					m := &mutator{r: newPcgRand()}
+					input := make([]byte, size)
+					for i := 0; i < b.N; i++ {
+						tc.mutator(m, input)
+					}
+				})
+			}
+		})
+	}
+}
diff --git a/src/internal/fuzz/pcg.go b/src/internal/fuzz/pcg.go
index dc07b9f5..b8251043 100644
--- a/src/internal/fuzz/pcg.go
+++ b/src/internal/fuzz/pcg.go
@@ -17,7 +17,6 @@ type mutatorRand interface {
 	uint32() uint32
 	intn(int) int
 	uint32n(uint32) uint32
-	exp2() int
 	bool() bool
 
 	save(randState, randInc *uint64)
@@ -123,11 +122,6 @@ func (r *pcgRand) uint32n(n uint32) uint32 {
 	return uint32(prod >> 32)
 }
 
-// exp2 generates n with probability 1/2^(n+1).
-func (r *pcgRand) exp2() int {
-	return bits.TrailingZeros32(r.uint32())
-}
-
 // bool generates a random bool.
 func (r *pcgRand) bool() bool {
 	return r.uint32()&1 == 0
diff --git a/src/internal/fuzz/worker.go b/src/internal/fuzz/worker.go
index e8a74217..9ee2f272 100644
--- a/src/internal/fuzz/worker.go
+++ b/src/internal/fuzz/worker.go
@@ -682,7 +682,7 @@ func (ws *workerServer) serve(ctx context.Context) error {
 }
 
 // chainedMutations is how many mutations are applied before the worker
-// resets the input to it's original state.
+// resets the input to its original state.
 // NOTE: this number was picked without much thought. It is low enough that
 // it seems to create a significant diversity in mutated inputs. We may want
 // to consider looking into this more closely once we have a proper performance
diff --git a/src/internal/goarch/gengoarch.go b/src/internal/goarch/gengoarch.go
index 0b0be5cd..a52936ef 100644
--- a/src/internal/goarch/gengoarch.go
+++ b/src/internal/goarch/gengoarch.go
@@ -17,11 +17,11 @@ import (
 var goarches []string
 
 func main() {
-	data, err := os.ReadFile("../../go/build/syslist.go")
+	data, err := os.ReadFile("../../internal/syslist/syslist.go")
 	if err != nil {
 		log.Fatal(err)
 	}
-	const goarchPrefix = `var knownArch = map[string]bool{`
+	const goarchPrefix = `var KnownArch = map[string]bool{`
 	inGOARCH := false
 	for _, line := range strings.Split(string(data), "\n") {
 		if strings.HasPrefix(line, goarchPrefix) {
diff --git a/src/internal/godebug/godebug_test.go b/src/internal/godebug/godebug_test.go
index 5d426fd5..fe1e6722 100644
--- a/src/internal/godebug/godebug_test.go
+++ b/src/internal/godebug/godebug_test.go
@@ -11,7 +11,6 @@ import (
 	"internal/testenv"
 	"os"
 	"os/exec"
-	"reflect"
 	"runtime/metrics"
 	"slices"
 	"strings"
@@ -110,6 +109,9 @@ func TestCmdBisect(t *testing.T) {
 
 	var want []string
 	src, err := os.ReadFile("godebug_test.go")
+	if err != nil {
+		t.Fatal(err)
+	}
 	for i, line := range strings.Split(string(src), "\n") {
 		if strings.Contains(line, "BISECT"+" "+"BUG") {
 			want = append(want, fmt.Sprintf("godebug_test.go:%d", i+1))
@@ -125,7 +127,7 @@ func TestCmdBisect(t *testing.T) {
 	}
 	slices.Sort(have)
 
-	if !reflect.DeepEqual(have, want) {
+	if !slices.Equal(have, want) {
 		t.Errorf("bad bisect output:\nhave %v\nwant %v\ncomplete output:\n%s", have, want, string(out))
 	}
 }
diff --git a/src/internal/godebugs/table.go b/src/internal/godebugs/table.go
index a802ac9c..9c48a923 100644
--- a/src/internal/godebugs/table.go
+++ b/src/internal/godebugs/table.go
@@ -26,10 +26,12 @@ type Info struct {
 // (Otherwise the test in this package will fail.)
 var All = []Info{
 	{Name: "asynctimerchan", Package: "time", Changed: 23, Old: "1"},
+	{Name: "dataindependenttiming", Package: "crypto/subtle", Opaque: true},
 	{Name: "execerrdot", Package: "os/exec"},
 	{Name: "gocachehash", Package: "cmd/go"},
 	{Name: "gocachetest", Package: "cmd/go"},
 	{Name: "gocacheverify", Package: "cmd/go"},
+	{Name: "gotestjsonbuildtext", Package: "cmd/go", Changed: 24, Old: "1"},
 	{Name: "gotypesalias", Package: "go/types", Changed: 23, Old: "0"},
 	{Name: "http2client", Package: "net/http"},
 	{Name: "http2debug", Package: "net/http", Opaque: true},
@@ -42,25 +44,27 @@ var All = []Info{
 	//{Name: "multipartfiles", Package: "mime/multipart"},
 	{Name: "multipartmaxheaders", Package: "mime/multipart"},
 	{Name: "multipartmaxparts", Package: "mime/multipart"},
-	{Name: "multipathtcp", Package: "net"},
+	{Name: "multipathtcp", Package: "net", Changed: 24, Old: "0"},
 	{Name: "netdns", Package: "net", Opaque: true},
 	{Name: "netedns0", Package: "net", Changed: 19, Old: "0"},
 	{Name: "panicnil", Package: "runtime", Changed: 21, Old: "1"},
 	{Name: "randautoseed", Package: "math/rand"},
+	{Name: "randseednop", Package: "math/rand", Changed: 24, Old: "0"},
+	{Name: "rsa1024min", Package: "crypto/rsa", Changed: 24, Old: "0"},
 	{Name: "tarinsecurepath", Package: "archive/tar"},
 	{Name: "tls10server", Package: "crypto/tls", Changed: 22, Old: "1"},
 	{Name: "tls3des", Package: "crypto/tls", Changed: 23, Old: "1"},
-	{Name: "tlskyber", Package: "crypto/tls", Changed: 23, Old: "0", Opaque: true},
 	{Name: "tlsmaxrsasize", Package: "crypto/tls"},
+	{Name: "tlsmlkem", Package: "crypto/tls", Changed: 24, Old: "0", Opaque: true},
 	{Name: "tlsrsakex", Package: "crypto/tls", Changed: 22, Old: "1"},
 	{Name: "tlsunsafeekm", Package: "crypto/tls", Changed: 22, Old: "1"},
 	{Name: "winreadlinkvolume", Package: "os", Changed: 22, Old: "0"},
 	{Name: "winsymlink", Package: "os", Changed: 22, Old: "0"},
 	{Name: "x509keypairleaf", Package: "crypto/tls", Changed: 23, Old: "0"},
 	{Name: "x509negativeserial", Package: "crypto/x509", Changed: 23, Old: "1"},
-	{Name: "x509sha1", Package: "crypto/x509"},
+	{Name: "x509rsacrt", Package: "crypto/x509", Changed: 24, Old: "0"},
 	{Name: "x509usefallbackroots", Package: "crypto/x509"},
-	{Name: "x509usepolicies", Package: "crypto/x509"},
+	{Name: "x509usepolicies", Package: "crypto/x509", Changed: 24, Old: "0"},
 	{Name: "zipinsecurepath", Package: "archive/zip"},
 }
 
diff --git a/src/internal/goexperiment/exp_spinbitmutex_off.go b/src/internal/goexperiment/exp_spinbitmutex_off.go
new file mode 100644
index 00000000..776b0dc7
--- /dev/null
+++ b/src/internal/goexperiment/exp_spinbitmutex_off.go
@@ -0,0 +1,8 @@
+// Code generated by mkconsts.go. DO NOT EDIT.
+
+//go:build !goexperiment.spinbitmutex
+
+package goexperiment
+
+const SpinbitMutex = false
+const SpinbitMutexInt = 0
diff --git a/src/internal/goexperiment/exp_spinbitmutex_on.go b/src/internal/goexperiment/exp_spinbitmutex_on.go
new file mode 100644
index 00000000..8468030c
--- /dev/null
+++ b/src/internal/goexperiment/exp_spinbitmutex_on.go
@@ -0,0 +1,8 @@
+// Code generated by mkconsts.go. DO NOT EDIT.
+
+//go:build goexperiment.spinbitmutex
+
+package goexperiment
+
+const SpinbitMutex = true
+const SpinbitMutexInt = 1
diff --git a/src/internal/goexperiment/exp_swissmap_off.go b/src/internal/goexperiment/exp_swissmap_off.go
new file mode 100644
index 00000000..2af40aa6
--- /dev/null
+++ b/src/internal/goexperiment/exp_swissmap_off.go
@@ -0,0 +1,8 @@
+// Code generated by mkconsts.go. DO NOT EDIT.
+
+//go:build !goexperiment.swissmap
+
+package goexperiment
+
+const SwissMap = false
+const SwissMapInt = 0
diff --git a/src/internal/goexperiment/exp_swissmap_on.go b/src/internal/goexperiment/exp_swissmap_on.go
new file mode 100644
index 00000000..73be49b6
--- /dev/null
+++ b/src/internal/goexperiment/exp_swissmap_on.go
@@ -0,0 +1,8 @@
+// Code generated by mkconsts.go. DO NOT EDIT.
+
+//go:build goexperiment.swissmap
+
+package goexperiment
+
+const SwissMap = true
+const SwissMapInt = 1
diff --git a/src/internal/goexperiment/exp_synchashtriemap_off.go b/src/internal/goexperiment/exp_synchashtriemap_off.go
new file mode 100644
index 00000000..cab23aac
--- /dev/null
+++ b/src/internal/goexperiment/exp_synchashtriemap_off.go
@@ -0,0 +1,8 @@
+// Code generated by mkconsts.go. DO NOT EDIT.
+
+//go:build !goexperiment.synchashtriemap
+
+package goexperiment
+
+const SyncHashTrieMap = false
+const SyncHashTrieMapInt = 0
diff --git a/src/internal/goexperiment/exp_synchashtriemap_on.go b/src/internal/goexperiment/exp_synchashtriemap_on.go
new file mode 100644
index 00000000..87433ef4
--- /dev/null
+++ b/src/internal/goexperiment/exp_synchashtriemap_on.go
@@ -0,0 +1,8 @@
+// Code generated by mkconsts.go. DO NOT EDIT.
+
+//go:build goexperiment.synchashtriemap
+
+package goexperiment
+
+const SyncHashTrieMap = true
+const SyncHashTrieMapInt = 1
diff --git a/src/internal/goexperiment/exp_synctest_off.go b/src/internal/goexperiment/exp_synctest_off.go
new file mode 100644
index 00000000..fade13f8
--- /dev/null
+++ b/src/internal/goexperiment/exp_synctest_off.go
@@ -0,0 +1,8 @@
+// Code generated by mkconsts.go. DO NOT EDIT.
+
+//go:build !goexperiment.synctest
+
+package goexperiment
+
+const Synctest = false
+const SynctestInt = 0
diff --git a/src/internal/goexperiment/exp_synctest_on.go b/src/internal/goexperiment/exp_synctest_on.go
new file mode 100644
index 00000000..9c44be72
--- /dev/null
+++ b/src/internal/goexperiment/exp_synctest_on.go
@@ -0,0 +1,8 @@
+// Code generated by mkconsts.go. DO NOT EDIT.
+
+//go:build goexperiment.synctest
+
+package goexperiment
+
+const Synctest = true
+const SynctestInt = 1
diff --git a/src/internal/goexperiment/flags.go b/src/internal/goexperiment/flags.go
index 3f9c5af6..948ed5c8 100644
--- a/src/internal/goexperiment/flags.go
+++ b/src/internal/goexperiment/flags.go
@@ -51,7 +51,7 @@ package goexperiment
 // tags, experiments use the strings.ToLower of their field name.
 //
 // For the baseline experimental configuration, see
-// objabi.experimentBaseline.
+// [internal/buildcfg.ParseGOEXPERIMENT].
 //
 // If you change this struct definition, run "go generate".
 type Flags struct {
@@ -113,6 +113,19 @@ type Flags struct {
 
 	// AliasTypeParams enables type parameters for alias types.
 	// Requires that gotypesalias=1 is set with GODEBUG.
-	// This flag will be removed with Go 1.24.
+	// This flag will be removed with Go 1.25.
 	AliasTypeParams bool
+
+	// SwissMap enables the SwissTable-based map implementation.
+	SwissMap bool
+
+	// SpinbitMutex enables the new "spinbit" mutex implementation on supported
+	// platforms. See https://go.dev/issue/68578.
+	SpinbitMutex bool
+
+	// SyncHashTrieMap enables the HashTrieMap sync.Map implementation.
+	SyncHashTrieMap bool
+
+	// Synctest enables the testing/synctest package.
+	Synctest bool
 }
diff --git a/src/internal/goos/gengoos.go b/src/internal/goos/gengoos.go
index 37d9706d..e0d4d38e 100644
--- a/src/internal/goos/gengoos.go
+++ b/src/internal/goos/gengoos.go
@@ -17,11 +17,11 @@ import (
 var gooses []string
 
 func main() {
-	data, err := os.ReadFile("../../go/build/syslist.go")
+	data, err := os.ReadFile("../../internal/syslist/syslist.go")
 	if err != nil {
 		log.Fatal(err)
 	}
-	const goosPrefix = `var knownOS = map[string]bool{`
+	const goosPrefix = `var KnownOS = map[string]bool{`
 	inGOOS := false
 	for _, line := range strings.Split(string(data), "\n") {
 		if strings.HasPrefix(line, goosPrefix) {
diff --git a/src/internal/goversion/goversion.go b/src/internal/goversion/goversion.go
index a9d6f12e..de2bcf4c 100644
--- a/src/internal/goversion/goversion.go
+++ b/src/internal/goversion/goversion.go
@@ -8,5 +8,5 @@ package goversion
 // in development and will eventually get released.
 //
 // It should be updated at the start of each development cycle to be
-// the version of the next Go 1.x release. See golang.org/issue/40705.
-const Version = 23
+// the version of the next Go 1.x release. See go.dev/issue/40705.
+const Version = 24
diff --git a/src/internal/pkgbits/decoder.go b/src/internal/pkgbits/decoder.go
index 4fe024d4..5a2b3f4a 100644
--- a/src/internal/pkgbits/decoder.go
+++ b/src/internal/pkgbits/decoder.go
@@ -21,7 +21,7 @@ import (
 // export data.
 type PkgDecoder struct {
 	// version is the file format version.
-	version uint32
+	version Version
 
 	// sync indicates whether the file uses sync markers.
 	sync bool
@@ -68,8 +68,6 @@ func (pr *PkgDecoder) SyncMarkers() bool { return pr.sync }
 // NewPkgDecoder returns a PkgDecoder initialized to read the Unified
 // IR export data from input. pkgPath is the package path for the
 // compilation unit that produced the export data.
-//
-// TODO(mdempsky): Remove pkgPath parameter; unneeded since CL 391014.
 func NewPkgDecoder(pkgPath, input string) PkgDecoder {
 	pr := PkgDecoder{
 		pkgPath: pkgPath,
@@ -80,14 +78,15 @@ func NewPkgDecoder(pkgPath, input string) PkgDecoder {
 
 	r := strings.NewReader(input)
 
-	assert(binary.Read(r, binary.LittleEndian, &pr.version) == nil)
+	var ver uint32
+	assert(binary.Read(r, binary.LittleEndian, &ver) == nil)
+	pr.version = Version(ver)
 
-	switch pr.version {
-	default:
-		panic(fmt.Errorf("unsupported version: %v", pr.version))
-	case 0:
-		// no flags
-	case 1:
+	if pr.version >= numVersions {
+		panic(fmt.Errorf("cannot decode %q, export data version %d is greater than maximum supported version %d", pkgPath, pr.version, numVersions-1))
+	}
+
+	if pr.version.Has(Flags) {
 		var flags uint32
 		assert(binary.Read(r, binary.LittleEndian, &flags) == nil)
 		pr.sync = flags&flagSyncMarkers != 0
@@ -102,7 +101,9 @@ func NewPkgDecoder(pkgPath, input string) PkgDecoder {
 	assert(err == nil)
 
 	pr.elemData = input[pos:]
-	assert(len(pr.elemData)-8 == int(pr.elemEnds[len(pr.elemEnds)-1]))
+
+	const fingerprintSize = 8
+	assert(len(pr.elemData)-fingerprintSize == int(pr.elemEnds[len(pr.elemEnds)-1]))
 
 	return pr
 }
@@ -136,7 +137,7 @@ func (pr *PkgDecoder) AbsIdx(k RelocKind, idx Index) int {
 		absIdx += int(pr.elemEndsEnds[k-1])
 	}
 	if absIdx >= int(pr.elemEndsEnds[k]) {
-		errorf("%v:%v is out of bounds; %v", k, idx, pr.elemEndsEnds)
+		panicf("%v:%v is out of bounds; %v", k, idx, pr.elemEndsEnds)
 	}
 	return absIdx
 }
@@ -242,7 +243,7 @@ type Decoder struct {
 
 func (r *Decoder) checkErr(err error) {
 	if err != nil {
-		errorf("unexpected decoding error: %w", err)
+		panicf("unexpected decoding error: %w", err)
 	}
 }
 
@@ -371,7 +372,7 @@ func (r *Decoder) Int64() int64 {
 	return r.rawVarint()
 }
 
-// Int64 decodes and returns a uint64 value from the element bitstream.
+// Uint64 decodes and returns a uint64 value from the element bitstream.
 func (r *Decoder) Uint64() uint64 {
 	r.Sync(SyncUint64)
 	return r.rawUvarint()
@@ -513,3 +514,6 @@ func (pr *PkgDecoder) PeekObj(idx Index) (string, string, CodeObj) {
 
 	return path, name, tag
 }
+
+// Version reports the version of the bitstream.
+func (w *Decoder) Version() Version { return w.common.version }
diff --git a/src/internal/pkgbits/encoder.go b/src/internal/pkgbits/encoder.go
index 70a2cbae..015842f5 100644
--- a/src/internal/pkgbits/encoder.go
+++ b/src/internal/pkgbits/encoder.go
@@ -6,7 +6,7 @@ package pkgbits
 
 import (
 	"bytes"
-	"crypto/md5"
+	"crypto/sha256"
 	"encoding/binary"
 	"go/constant"
 	"io"
@@ -15,20 +15,12 @@ import (
 	"strings"
 )
 
-// currentVersion is the current version number.
-//
-//   - v0: initial prototype
-//
-//   - v1: adds the flags uint32 word
-//
-// TODO(mdempsky): For the next version bump:
-//   - remove the legacy "has init" bool from the public root
-//   - remove obj's "derived func instance" bool
-const currentVersion uint32 = 1
-
 // A PkgEncoder provides methods for encoding a package's Unified IR
 // export data.
 type PkgEncoder struct {
+	// version of the bitstream.
+	version Version
+
 	// elems holds the bitstream for previously encoded elements.
 	elems [numRelocs][]string
 
@@ -52,8 +44,9 @@ func (pw *PkgEncoder) SyncMarkers() bool { return pw.syncFrames >= 0 }
 // export data files, but can help diagnosing desync errors in
 // higher-level Unified IR reader/writer code. If syncFrames is
 // negative, then sync markers are omitted entirely.
-func NewPkgEncoder(syncFrames int) PkgEncoder {
+func NewPkgEncoder(version Version, syncFrames int) PkgEncoder {
 	return PkgEncoder{
+		version:    version,
 		stringsIdx: make(map[string]Index),
 		syncFrames: syncFrames,
 	}
@@ -62,20 +55,22 @@ func NewPkgEncoder(syncFrames int) PkgEncoder {
 // DumpTo writes the package's encoded data to out0 and returns the
 // package fingerprint.
 func (pw *PkgEncoder) DumpTo(out0 io.Writer) (fingerprint [8]byte) {
-	h := md5.New()
+	h := sha256.New()
 	out := io.MultiWriter(out0, h)
 
 	writeUint32 := func(x uint32) {
 		assert(binary.Write(out, binary.LittleEndian, x) == nil)
 	}
 
-	writeUint32(currentVersion)
+	writeUint32(uint32(pw.version))
 
-	var flags uint32
-	if pw.SyncMarkers() {
-		flags |= flagSyncMarkers
+	if pw.version.Has(Flags) {
+		var flags uint32
+		if pw.SyncMarkers() {
+			flags |= flagSyncMarkers
+		}
+		writeUint32(flags)
 	}
-	writeUint32(flags)
 
 	// Write elemEndsEnds.
 	var sum uint32
@@ -194,7 +189,7 @@ func (w *Encoder) Flush() Index {
 
 func (w *Encoder) checkErr(err error) {
 	if err != nil {
-		errorf("unexpected encoding error: %v", err)
+		panicf("unexpected encoding error: %v", err)
 	}
 }
 
@@ -298,7 +293,7 @@ func (w *Encoder) Len(x int) { assert(x >= 0); w.Uint64(uint64(x)) }
 // Int encodes and writes an int value into the element bitstream.
 func (w *Encoder) Int(x int) { w.Int64(int64(x)) }
 
-// Len encodes and writes a uint value into the element bitstream.
+// Uint encodes and writes a uint value into the element bitstream.
 func (w *Encoder) Uint(x uint) { w.Uint64(uint64(x)) }
 
 // Reloc encodes and writes a relocation for the given (section,
@@ -359,7 +354,7 @@ func (w *Encoder) Value(val constant.Value) {
 func (w *Encoder) scalar(val constant.Value) {
 	switch v := constant.Val(val).(type) {
 	default:
-		errorf("unhandled %v (%v)", val, val.Kind())
+		panicf("unhandled %v (%v)", val, val.Kind())
 	case bool:
 		w.Code(ValBool)
 		w.Bool(v)
@@ -392,3 +387,6 @@ func (w *Encoder) bigFloat(v *big.Float) {
 	b := v.Append(nil, 'p', -1)
 	w.String(string(b)) // TODO: More efficient encoding.
 }
+
+// Version reports the version of the bitstream.
+func (w *Encoder) Version() Version { return w.p.version }
diff --git a/src/internal/pkgbits/pkgbits_test.go b/src/internal/pkgbits/pkgbits_test.go
new file mode 100644
index 00000000..6f400474
--- /dev/null
+++ b/src/internal/pkgbits/pkgbits_test.go
@@ -0,0 +1,76 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package pkgbits_test
+
+import (
+	"internal/pkgbits"
+	"strings"
+	"testing"
+)
+
+func TestRoundTrip(t *testing.T) {
+	for _, version := range []pkgbits.Version{
+		pkgbits.V0,
+		pkgbits.V1,
+		pkgbits.V2,
+	} {
+		pw := pkgbits.NewPkgEncoder(version, -1)
+		w := pw.NewEncoder(pkgbits.RelocMeta, pkgbits.SyncPublic)
+		w.Flush()
+
+		var b strings.Builder
+		_ = pw.DumpTo(&b)
+		input := b.String()
+
+		pr := pkgbits.NewPkgDecoder("package_id", input)
+		r := pr.NewDecoder(pkgbits.RelocMeta, pkgbits.PublicRootIdx, pkgbits.SyncPublic)
+
+		if r.Version() != w.Version() {
+			t.Errorf("Expected reader version %q to be the writer version %q", r.Version(), w.Version())
+		}
+	}
+}
+
+// Type checker to enforce that know V* have the constant values they must have.
+var _ [0]bool = [pkgbits.V0]bool{}
+var _ [1]bool = [pkgbits.V1]bool{}
+
+func TestVersions(t *testing.T) {
+	type vfpair struct {
+		v pkgbits.Version
+		f pkgbits.Field
+	}
+
+	// has field tests
+	for _, c := range []vfpair{
+		{pkgbits.V1, pkgbits.Flags},
+		{pkgbits.V2, pkgbits.Flags},
+		{pkgbits.V0, pkgbits.HasInit},
+		{pkgbits.V1, pkgbits.HasInit},
+		{pkgbits.V0, pkgbits.DerivedFuncInstance},
+		{pkgbits.V1, pkgbits.DerivedFuncInstance},
+		{pkgbits.V0, pkgbits.DerivedInfoNeeded},
+		{pkgbits.V1, pkgbits.DerivedInfoNeeded},
+		{pkgbits.V2, pkgbits.AliasTypeParamNames},
+	} {
+		if !c.v.Has(c.f) {
+			t.Errorf("Expected version %v to have field %v", c.v, c.f)
+		}
+	}
+
+	// does not have field tests
+	for _, c := range []vfpair{
+		{pkgbits.V0, pkgbits.Flags},
+		{pkgbits.V2, pkgbits.HasInit},
+		{pkgbits.V2, pkgbits.DerivedFuncInstance},
+		{pkgbits.V2, pkgbits.DerivedInfoNeeded},
+		{pkgbits.V0, pkgbits.AliasTypeParamNames},
+		{pkgbits.V1, pkgbits.AliasTypeParamNames},
+	} {
+		if c.v.Has(c.f) {
+			t.Errorf("Expected version %v to not have field %v", c.v, c.f)
+		}
+	}
+}
diff --git a/src/internal/pkgbits/support.go b/src/internal/pkgbits/support.go
index f7579dfd..50534a29 100644
--- a/src/internal/pkgbits/support.go
+++ b/src/internal/pkgbits/support.go
@@ -12,6 +12,6 @@ func assert(b bool) {
 	}
 }
 
-func errorf(format string, args ...any) {
+func panicf(format string, args ...any) {
 	panic(fmt.Errorf(format, args...))
 }
diff --git a/src/internal/pkgbits/version.go b/src/internal/pkgbits/version.go
new file mode 100644
index 00000000..ba664f45
--- /dev/null
+++ b/src/internal/pkgbits/version.go
@@ -0,0 +1,85 @@
+// Copyright 2021 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package pkgbits
+
+// Version indicates a version of a unified IR bitstream.
+// Each Version indicates the addition, removal, or change of
+// new data in the bitstream.
+//
+// These are serialized to disk and the interpretation remains fixed.
+type Version uint32
+
+const (
+	// V0: initial prototype.
+	//
+	// All data that is not assigned a Field is in version V0
+	// and has not been deprecated.
+	V0 Version = iota
+
+	// V1: adds the Flags uint32 word
+	V1
+
+	// V2: removes unused legacy fields and supports type parameters for aliases.
+	// - remove the legacy "has init" bool from the public root
+	// - remove obj's "derived func instance" bool
+	// - add a TypeParamNames field to ObjAlias
+	// - remove derived info "needed" bool
+	V2
+
+	numVersions = iota
+)
+
+// Field denotes a unit of data in the serialized unified IR bitstream.
+// It is conceptually a like field in a structure.
+//
+// We only really need Fields when the data may or may not be present
+// in a stream based on the Version of the bitstream.
+//
+// Unlike much of pkgbits, Fields are not serialized and
+// can change values as needed.
+type Field int
+
+const (
+	// Flags in a uint32 in the header of a bitstream
+	// that is used to indicate whether optional features are enabled.
+	Flags Field = iota
+
+	// Deprecated: HasInit was a bool indicating whether a package
+	// has any init functions.
+	HasInit
+
+	// Deprecated: DerivedFuncInstance was a bool indicating
+	// whether an object was a function instance.
+	DerivedFuncInstance
+
+	// ObjAlias has a list of TypeParamNames.
+	AliasTypeParamNames
+
+	// Deprecated: DerivedInfoNeeded was a bool indicating
+	// whether a type was a derived type.
+	DerivedInfoNeeded
+
+	numFields = iota
+)
+
+// introduced is the version a field was added.
+var introduced = [numFields]Version{
+	Flags:               V1,
+	AliasTypeParamNames: V2,
+}
+
+// removed is the version a field was removed in or 0 for fields
+// that have not yet been deprecated.
+// (So removed[f]-1 is the last version it is included in.)
+var removed = [numFields]Version{
+	HasInit:             V2,
+	DerivedFuncInstance: V2,
+	DerivedInfoNeeded:   V2,
+}
+
+// Has reports whether field f is present in a bitstream at version v.
+func (v Version) Has(f Field) bool {
+	return introduced[f] <= v && (v < removed[f] || removed[f] == V0)
+}
diff --git a/src/internal/platform/supported.go b/src/internal/platform/supported.go
index a774247e..e864c37d 100644
--- a/src/internal/platform/supported.go
+++ b/src/internal/platform/supported.go
@@ -173,7 +173,8 @@ func BuildModeSupported(compiler, buildmode, goos, goarch string) bool {
 			"android/amd64", "android/arm", "android/arm64", "android/386",
 			"freebsd/amd64",
 			"darwin/amd64", "darwin/arm64",
-			"windows/amd64", "windows/386", "windows/arm64":
+			"windows/amd64", "windows/386", "windows/arm64",
+			"wasip1/wasm":
 			return true
 		}
 		return false
@@ -280,7 +281,7 @@ func FirstClass(goos, goarch string) bool {
 	return distInfo[OSArch{goos, goarch}].FirstClass
 }
 
-// Broken reportsr whether goos/goarch is considered a broken port.
+// Broken reports whether goos/goarch is considered a broken port.
 // (See https://go.dev/wiki/PortingPolicy#broken-ports.)
 func Broken(goos, goarch string) bool {
 	return distInfo[OSArch{goos, goarch}].Broken
diff --git a/src/internal/platform/zosarch.go b/src/internal/platform/zosarch.go
index 1df34851..ebde978a 100644
--- a/src/internal/platform/zosarch.go
+++ b/src/internal/platform/zosarch.go
@@ -111,6 +111,6 @@ var distInfo = map[OSArch]osArchInfo{
 	{"wasip1", "wasm"}:     {},
 	{"windows", "386"}:     {CgoSupported: true, FirstClass: true},
 	{"windows", "amd64"}:   {CgoSupported: true, FirstClass: true},
-	{"windows", "arm"}:     {},
+	{"windows", "arm"}:     {Broken: true},
 	{"windows", "arm64"}:   {CgoSupported: true},
 }
diff --git a/src/internal/poll/copy_file_range_freebsd.go b/src/internal/poll/copy_file_range_freebsd.go
new file mode 100644
index 00000000..63fa013e
--- /dev/null
+++ b/src/internal/poll/copy_file_range_freebsd.go
@@ -0,0 +1,53 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package poll
+
+import (
+	"internal/syscall/unix"
+	"syscall"
+)
+
+func supportCopyFileRange() bool {
+	return unix.SupportCopyFileRange()
+}
+
+// For best performance, call copy_file_range() with the largest len value
+// possible. It is interruptible on most file systems, so there is no penalty
+// for using very large len values, even SSIZE_MAX.
+const maxCopyFileRangeRound = 1<<31 - 1
+
+func handleCopyFileRangeErr(err error, copied, written int64) (bool, error) {
+	switch err {
+	case syscall.ENOSYS:
+		// The copy_file_range(2) function first appeared in FreeBSD 13.0.
+		// Go supports FreeBSD >= 12, so the system call
+		// may not be present. We've detected the FreeBSD version with
+		// unix.SupportCopyFileRange() at the beginning of this function,
+		// but we still want to check for ENOSYS here to prevent some rare
+		// case like https://go.dev/issue/58592
+		//
+		// If we see ENOSYS, we have certainly not transferred
+		// any data, so we can tell the caller that we
+		// couldn't handle the transfer and let them fall
+		// back to more generic code.
+		return false, nil
+	case syscall.EFBIG, syscall.EINVAL, syscall.EIO:
+		// For EFBIG, the copy has exceeds the process's file size limit
+		// or the maximum file size for the filesystem dst resides on, in
+		// this case, we leave it to generic copy.
+		//
+		// For EINVAL, there could be a few reasons:
+		// 1. Either dst or src refers to a file object that
+		// is not a regular file, for instance, a pipe.
+		// 2. src and dst refer to the same file and byte ranges
+		// overlap.
+		// 3. The flags argument is not 0.
+		// Neither of these cases should be considered handled by
+		// copy_file_range(2) because there is no data transfer, so
+		// just fall back to generic copy.
+		return false, nil
+	}
+	return true, err
+}
diff --git a/src/internal/poll/copy_file_range_linux.go b/src/internal/poll/copy_file_range_linux.go
index 3d51333d..50b9f1bc 100644
--- a/src/internal/poll/copy_file_range_linux.go
+++ b/src/internal/poll/copy_file_range_linux.go
@@ -10,6 +10,10 @@ import (
 	"syscall"
 )
 
+func supportCopyFileRange() bool {
+	return isKernelVersionGE53()
+}
+
 var isKernelVersionGE53 = sync.OnceValue(func() bool {
 	major, minor := unix.KernelVersion()
 	// copy_file_range(2) is broken in various ways on kernels older than 5.3,
@@ -18,104 +22,62 @@ var isKernelVersionGE53 = sync.OnceValue(func() bool {
 	return major > 5 || (major == 5 && minor >= 3)
 })
 
-const maxCopyFileRangeRound = 1 << 30
+// For best performance, call copy_file_range() with the largest len value
+// possible. Linux sets up a limitation of data transfer for most of its I/O
+// system calls, as MAX_RW_COUNT (INT_MAX & PAGE_MASK). This value equals to
+// the maximum integer value minus a page size that is typically 2^12=4096 bytes.
+// That is to say, it's the maximum integer value with the lowest 12 bits unset,
+// which is 0x7ffff000.
+const maxCopyFileRangeRound = 0x7ffff000
 
-// CopyFileRange copies at most remain bytes of data from src to dst, using
-// the copy_file_range system call. dst and src must refer to regular files.
-func CopyFileRange(dst, src *FD, remain int64) (written int64, handled bool, err error) {
-	if !isKernelVersionGE53() {
-		return 0, false, nil
-	}
-
-	for remain > 0 {
-		max := remain
-		if max > maxCopyFileRangeRound {
-			max = maxCopyFileRangeRound
-		}
-		n, err := copyFileRange(dst, src, int(max))
-		switch err {
-		case syscall.ENOSYS:
-			// copy_file_range(2) was introduced in Linux 4.5.
-			// Go supports Linux >= 2.6.33, so the system call
-			// may not be present.
-			//
-			// If we see ENOSYS, we have certainly not transferred
-			// any data, so we can tell the caller that we
-			// couldn't handle the transfer and let them fall
-			// back to more generic code.
-			return 0, false, nil
-		case syscall.EXDEV, syscall.EINVAL, syscall.EIO, syscall.EOPNOTSUPP, syscall.EPERM:
-			// Prior to Linux 5.3, it was not possible to
-			// copy_file_range across file systems. Similarly to
-			// the ENOSYS case above, if we see EXDEV, we have
-			// not transferred any data, and we can let the caller
-			// fall back to generic code.
-			//
-			// As for EINVAL, that is what we see if, for example,
-			// dst or src refer to a pipe rather than a regular
-			// file. This is another case where no data has been
-			// transferred, so we consider it unhandled.
-			//
-			// If src and dst are on CIFS, we can see EIO.
-			// See issue #42334.
-			//
-			// If the file is on NFS, we can see EOPNOTSUPP.
-			// See issue #40731.
-			//
-			// If the process is running inside a Docker container,
-			// we might see EPERM instead of ENOSYS. See issue
-			// #40893. Since EPERM might also be a legitimate error,
-			// don't mark copy_file_range(2) as unsupported.
-			return 0, false, nil
-		case nil:
-			if n == 0 {
-				// If we did not read any bytes at all,
-				// then this file may be in a file system
-				// where copy_file_range silently fails.
-				// https://lore.kernel.org/linux-fsdevel/20210126233840.GG4626@dread.disaster.area/T/#m05753578c7f7882f6e9ffe01f981bc223edef2b0
-				if written == 0 {
-					return 0, false, nil
-				}
-				// Otherwise src is at EOF, which means
-				// we are done.
-				return written, true, nil
+func handleCopyFileRangeErr(err error, copied, written int64) (bool, error) {
+	switch err {
+	case syscall.ENOSYS:
+		// copy_file_range(2) was introduced in Linux 4.5.
+		// Go supports Linux >= 3.2, so the system call
+		// may not be present.
+		//
+		// If we see ENOSYS, we have certainly not transferred
+		// any data, so we can tell the caller that we
+		// couldn't handle the transfer and let them fall
+		// back to more generic code.
+		return false, nil
+	case syscall.EXDEV, syscall.EINVAL, syscall.EIO, syscall.EOPNOTSUPP, syscall.EPERM:
+		// Prior to Linux 5.3, it was not possible to
+		// copy_file_range across file systems. Similarly to
+		// the ENOSYS case above, if we see EXDEV, we have
+		// not transferred any data, and we can let the caller
+		// fall back to generic code.
+		//
+		// As for EINVAL, that is what we see if, for example,
+		// dst or src refer to a pipe rather than a regular
+		// file. This is another case where no data has been
+		// transferred, so we consider it unhandled.
+		//
+		// If src and dst are on CIFS, we can see EIO.
+		// See issue #42334.
+		//
+		// If the file is on NFS, we can see EOPNOTSUPP.
+		// See issue #40731.
+		//
+		// If the process is running inside a Docker container,
+		// we might see EPERM instead of ENOSYS. See issue
+		// #40893. Since EPERM might also be a legitimate error,
+		// don't mark copy_file_range(2) as unsupported.
+		return false, nil
+	case nil:
+		if copied == 0 {
+			// If we did not read any bytes at all,
+			// then this file may be in a file system
+			// where copy_file_range silently fails.
+			// https://lore.kernel.org/linux-fsdevel/20210126233840.GG4626@dread.disaster.area/T/#m05753578c7f7882f6e9ffe01f981bc223edef2b0
+			if written == 0 {
+				return false, nil
 			}
-			remain -= n
-			written += n
-		default:
-			return written, true, err
-		}
-	}
-	return written, true, nil
-}
 
-// copyFileRange performs one round of copy_file_range(2).
-func copyFileRange(dst, src *FD, max int) (written int64, err error) {
-	// The signature of copy_file_range(2) is:
-	//
-	// ssize_t copy_file_range(int fd_in, loff_t *off_in,
-	//                         int fd_out, loff_t *off_out,
-	//                         size_t len, unsigned int flags);
-	//
-	// Note that in the call to unix.CopyFileRange below, we use nil
-	// values for off_in and off_out. For the system call, this means
-	// "use and update the file offsets". That is why we must acquire
-	// locks for both file descriptors (and why this whole machinery is
-	// in the internal/poll package to begin with).
-	if err := dst.writeLock(); err != nil {
-		return 0, err
-	}
-	defer dst.writeUnlock()
-	if err := src.readLock(); err != nil {
-		return 0, err
-	}
-	defer src.readUnlock()
-	var n int
-	for {
-		n, err = unix.CopyFileRange(src.Sysfd, nil, dst.Sysfd, nil, max, 0)
-		if err != syscall.EINTR {
-			break
+			// Otherwise src is at EOF, which means
+			// we are done.
 		}
 	}
-	return int64(n), err
+	return true, err
 }
diff --git a/src/internal/poll/copy_file_range_unix.go b/src/internal/poll/copy_file_range_unix.go
new file mode 100644
index 00000000..d3d3aaee
--- /dev/null
+++ b/src/internal/poll/copy_file_range_unix.go
@@ -0,0 +1,70 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build freebsd || linux
+
+package poll
+
+import "internal/syscall/unix"
+
+// CopyFileRange copies at most remain bytes of data from src to dst, using
+// the copy_file_range system call. dst and src must refer to regular files.
+func CopyFileRange(dst, src *FD, remain int64) (written int64, handled bool, err error) {
+	if !supportCopyFileRange() {
+		return 0, false, nil
+	}
+
+	for remain > 0 {
+		max := remain
+		if max > maxCopyFileRangeRound {
+			max = maxCopyFileRangeRound
+		}
+		n, e := copyFileRange(dst, src, int(max))
+		if n > 0 {
+			remain -= n
+			written += n
+		}
+		handled, err = handleCopyFileRangeErr(e, n, written)
+		if n == 0 || !handled || err != nil {
+			return
+		}
+	}
+
+	return written, true, nil
+}
+
+// copyFileRange performs one round of copy_file_range(2).
+func copyFileRange(dst, src *FD, max int) (written int64, err error) {
+	// For Linux, the signature of copy_file_range(2) is:
+	//
+	// ssize_t copy_file_range(int fd_in, loff_t *off_in,
+	//                         int fd_out, loff_t *off_out,
+	//                         size_t len, unsigned int flags);
+	//
+	// For FreeBSD, the signature of copy_file_range(2) is:
+	//
+	// ssize_t
+	// copy_file_range(int infd, off_t *inoffp, int outfd, off_t *outoffp,
+	//                 size_t len, unsigned int flags);
+	//
+	// Note that in the call to unix.CopyFileRange below, we use nil
+	// values for off_in/off_out and inoffp/outoffp, which means "the file
+	// offset for infd(fd_in) or outfd(fd_out) respectively will be used and
+	// updated by the number of bytes copied".
+	//
+	// That is why we must acquire locks for both file descriptors (and why
+	// this whole machinery is in the internal/poll package to begin with).
+	if err := dst.writeLock(); err != nil {
+		return 0, err
+	}
+	defer dst.writeUnlock()
+	if err := src.readLock(); err != nil {
+		return 0, err
+	}
+	defer src.readUnlock()
+	return ignoringEINTR2(func() (int64, error) {
+		n, err := unix.CopyFileRange(src.Sysfd, nil, dst.Sysfd, nil, max, 0)
+		return int64(n), err
+	})
+}
diff --git a/src/internal/poll/fd_posix.go b/src/internal/poll/fd_posix.go
index 5bd333b4..12f13864 100644
--- a/src/internal/poll/fd_posix.go
+++ b/src/internal/poll/fd_posix.go
@@ -77,3 +77,13 @@ func ignoringEINTR(fn func() error) error {
 		}
 	}
 }
+
+// ignoringEINTR2 is ignoringEINTR, but returning an additional value.
+func ignoringEINTR2[T any](fn func() (T, error)) (T, error) {
+	for {
+		v, err := fn()
+		if err != syscall.EINTR {
+			return v, err
+		}
+	}
+}
diff --git a/src/internal/poll/fd_wasip1.go b/src/internal/poll/fd_wasip1.go
index 195aaa95..4f83d287 100644
--- a/src/internal/poll/fd_wasip1.go
+++ b/src/internal/poll/fd_wasip1.go
@@ -225,11 +225,11 @@ func readIntLE(b []byte, size uintptr) uint64 {
 	case 1:
 		return uint64(b[0])
 	case 2:
-		return uint64(byteorder.LeUint16(b))
+		return uint64(byteorder.LEUint16(b))
 	case 4:
-		return uint64(byteorder.LeUint32(b))
+		return uint64(byteorder.LEUint32(b))
 	case 8:
-		return uint64(byteorder.LeUint64(b))
+		return uint64(byteorder.LEUint64(b))
 	default:
 		panic("internal/poll: readInt with unsupported size")
 	}
diff --git a/src/internal/poll/sendfile_bsd.go b/src/internal/poll/sendfile_bsd.go
deleted file mode 100644
index d1023d4e..00000000
--- a/src/internal/poll/sendfile_bsd.go
+++ /dev/null
@@ -1,77 +0,0 @@
-// Copyright 2011 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-//go:build darwin || dragonfly || freebsd
-
-package poll
-
-import "syscall"
-
-// maxSendfileSize is the largest chunk size we ask the kernel to copy
-// at a time.
-const maxSendfileSize int = 4 << 20
-
-// SendFile wraps the sendfile system call.
-func SendFile(dstFD *FD, src int, pos, remain int64) (written int64, err error, handled bool) {
-	defer func() {
-		TestHookDidSendFile(dstFD, src, written, err, handled)
-	}()
-	if err := dstFD.writeLock(); err != nil {
-		return 0, err, false
-	}
-	defer dstFD.writeUnlock()
-
-	if err := dstFD.pd.prepareWrite(dstFD.isFile); err != nil {
-		return 0, err, false
-	}
-
-	dst := dstFD.Sysfd
-	for remain > 0 {
-		n := maxSendfileSize
-		if int64(n) > remain {
-			n = int(remain)
-		}
-		m := n
-		pos1 := pos
-		n, err = syscall.Sendfile(dst, src, &pos1, n)
-		if n > 0 {
-			pos += int64(n)
-			written += int64(n)
-			remain -= int64(n)
-			// (n, nil) indicates that sendfile(2) has transferred
-			// the exact number of bytes we requested, or some unretryable
-			// error have occurred with partial bytes sent. Either way, we
-			// don't need to go through the following logic to check EINTR
-			// or fell into dstFD.pd.waitWrite, just continue to send the
-			// next chunk or break the loop.
-			if n == m {
-				continue
-			} else if err != syscall.EAGAIN &&
-				err != syscall.EINTR &&
-				err != syscall.EBUSY {
-				// Particularly, EPIPE. Errors like that would normally lead
-				// the subsequent sendfile(2) call to (-1, EBADF).
-				break
-			}
-		} else if err != syscall.EAGAIN && err != syscall.EINTR {
-			// This includes syscall.ENOSYS (no kernel
-			// support) and syscall.EINVAL (fd types which
-			// don't implement sendfile), and other errors.
-			// We should end the loop when there is no error
-			// returned from sendfile(2) or it is not a retryable error.
-			break
-		}
-		if err == syscall.EINTR {
-			continue
-		}
-		if err = dstFD.pd.waitWrite(dstFD.isFile); err != nil {
-			break
-		}
-	}
-	if err == syscall.EAGAIN {
-		err = nil
-	}
-	handled = written != 0 || (err != syscall.ENOSYS && err != syscall.EINVAL && err != syscall.EOPNOTSUPP && err != syscall.ENOTSUP)
-	return
-}
diff --git a/src/internal/poll/sendfile_linux.go b/src/internal/poll/sendfile_linux.go
deleted file mode 100644
index 1c4130d4..00000000
--- a/src/internal/poll/sendfile_linux.go
+++ /dev/null
@@ -1,58 +0,0 @@
-// Copyright 2011 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package poll
-
-import "syscall"
-
-// maxSendfileSize is the largest chunk size we ask the kernel to copy
-// at a time.
-const maxSendfileSize int = 4 << 20
-
-// SendFile wraps the sendfile system call.
-func SendFile(dstFD *FD, src int, remain int64) (written int64, err error, handled bool) {
-	defer func() {
-		TestHookDidSendFile(dstFD, src, written, err, handled)
-	}()
-	if err := dstFD.writeLock(); err != nil {
-		return 0, err, false
-	}
-	defer dstFD.writeUnlock()
-
-	if err := dstFD.pd.prepareWrite(dstFD.isFile); err != nil {
-		return 0, err, false
-	}
-
-	dst := dstFD.Sysfd
-	for remain > 0 {
-		n := maxSendfileSize
-		if int64(n) > remain {
-			n = int(remain)
-		}
-		n, err = syscall.Sendfile(dst, src, nil, n)
-		if n > 0 {
-			written += int64(n)
-			remain -= int64(n)
-			continue
-		} else if err != syscall.EAGAIN && err != syscall.EINTR {
-			// This includes syscall.ENOSYS (no kernel
-			// support) and syscall.EINVAL (fd types which
-			// don't implement sendfile), and other errors.
-			// We should end the loop when there is no error
-			// returned from sendfile(2) or it is not a retryable error.
-			break
-		}
-		if err == syscall.EINTR {
-			continue
-		}
-		if err = dstFD.pd.waitWrite(dstFD.isFile); err != nil {
-			break
-		}
-	}
-	if err == syscall.EAGAIN {
-		err = nil
-	}
-	handled = written != 0 || (err != syscall.ENOSYS && err != syscall.EINVAL)
-	return
-}
diff --git a/src/internal/poll/sendfile_solaris.go b/src/internal/poll/sendfile_solaris.go
index b7c3f81a..605323b9 100644
--- a/src/internal/poll/sendfile_solaris.go
+++ b/src/internal/poll/sendfile_solaris.go
@@ -4,66 +4,9 @@
 
 package poll
 
-import "syscall"
+//go:cgo_ldflag "-lsendfile"
 
 // Not strictly needed, but very helpful for debugging, see issue #10221.
 //
 //go:cgo_import_dynamic _ _ "libsendfile.so"
 //go:cgo_import_dynamic _ _ "libsocket.so"
-
-// maxSendfileSize is the largest chunk size we ask the kernel to copy
-// at a time.
-const maxSendfileSize int = 4 << 20
-
-// SendFile wraps the sendfile system call.
-func SendFile(dstFD *FD, src int, pos, remain int64) (written int64, err error, handled bool) {
-	defer func() {
-		TestHookDidSendFile(dstFD, src, written, err, handled)
-	}()
-	if err := dstFD.writeLock(); err != nil {
-		return 0, err, false
-	}
-	defer dstFD.writeUnlock()
-
-	if err := dstFD.pd.prepareWrite(dstFD.isFile); err != nil {
-		return 0, err, false
-	}
-
-	dst := dstFD.Sysfd
-	for remain > 0 {
-		n := maxSendfileSize
-		if int64(n) > remain {
-			n = int(remain)
-		}
-		pos1 := pos
-		n, err = syscall.Sendfile(dst, src, &pos1, n)
-		if err == syscall.EAGAIN || err == syscall.EINTR {
-			// partial write may have occurred
-			n = int(pos1 - pos)
-		}
-		if n > 0 {
-			pos += int64(n)
-			written += int64(n)
-			remain -= int64(n)
-			continue
-		} else if err != syscall.EAGAIN && err != syscall.EINTR {
-			// This includes syscall.ENOSYS (no kernel
-			// support) and syscall.EINVAL (fd types which
-			// don't implement sendfile), and other errors.
-			// We should end the loop when there is no error
-			// returned from sendfile(2) or it is not a retryable error.
-			break
-		}
-		if err == syscall.EINTR {
-			continue
-		}
-		if err = dstFD.pd.waitWrite(dstFD.isFile); err != nil {
-			break
-		}
-	}
-	if err == syscall.EAGAIN {
-		err = nil
-	}
-	handled = written != 0 || (err != syscall.ENOSYS && err != syscall.EINVAL)
-	return
-}
diff --git a/src/internal/poll/sendfile_unix.go b/src/internal/poll/sendfile_unix.go
new file mode 100644
index 00000000..1105e056
--- /dev/null
+++ b/src/internal/poll/sendfile_unix.go
@@ -0,0 +1,170 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build darwin || dragonfly || freebsd || linux || solaris
+
+package poll
+
+import (
+	"io"
+	"runtime"
+	"syscall"
+)
+
+// SendFile wraps the sendfile system call.
+//
+// It copies data from src (a file descriptor) to dstFD,
+// starting at the current position of src.
+// It updates the current position of src to after the
+// copied data.
+//
+// If size is zero, it copies the rest of src.
+// Otherwise, it copies up to size bytes.
+//
+// The handled return parameter indicates whether SendFile
+// was able to handle some or all of the operation.
+// If handled is false, sendfile was unable to perform the copy,
+// has not modified the source or destination,
+// and the caller should perform the copy using a fallback implementation.
+func SendFile(dstFD *FD, src int, size int64) (n int64, err error, handled bool) {
+	if goos := runtime.GOOS; goos == "linux" || goos == "android" {
+		// Linux's sendfile doesn't require any setup:
+		// It sends from the current position of the source file and
+		// updates the position of the source after sending.
+		return sendFile(dstFD, src, nil, size)
+	}
+
+	// Non-Linux sendfile implementations don't use the current position of the source file,
+	// so we need to look up the position, pass it explicitly, and adjust it after
+	// sendfile returns.
+	start, err := ignoringEINTR2(func() (int64, error) {
+		return syscall.Seek(src, 0, io.SeekCurrent)
+	})
+	if err != nil {
+		return 0, err, false
+	}
+
+	pos := start
+	n, err, handled = sendFile(dstFD, src, &pos, size)
+	if n > 0 {
+		ignoringEINTR2(func() (int64, error) {
+			return syscall.Seek(src, start+n, io.SeekStart)
+		})
+	}
+	return n, err, handled
+}
+
+// sendFile wraps the sendfile system call.
+func sendFile(dstFD *FD, src int, offset *int64, size int64) (written int64, err error, handled bool) {
+	defer func() {
+		TestHookDidSendFile(dstFD, src, written, err, handled)
+	}()
+	if err := dstFD.writeLock(); err != nil {
+		return 0, err, false
+	}
+	defer dstFD.writeUnlock()
+
+	if err := dstFD.pd.prepareWrite(dstFD.isFile); err != nil {
+		return 0, err, false
+	}
+
+	dst := dstFD.Sysfd
+	for {
+		// Some platforms support passing 0 to read to the end of the source,
+		// but all platforms support just writing a large value.
+		//
+		// Limit the maximum size to fit in an int32, to avoid any possible overflow.
+		chunk := 1<<31 - 1
+		if size > 0 {
+			chunk = int(min(size-written, int64(chunk)))
+		}
+		var n int
+		n, err = sendFileChunk(dst, src, offset, chunk, written)
+		if n > 0 {
+			written += int64(n)
+		}
+		switch err {
+		case nil:
+			// We're done if sendfile copied no bytes
+			// (we're at the end of the source)
+			// or if we have a size limit and have reached it.
+			//
+			// If sendfile copied some bytes and we don't have a size limit,
+			// try again to see if there is more data to copy.
+			if n == 0 || (size > 0 && written >= size) {
+				return written, nil, true
+			}
+		case syscall.EAGAIN:
+			// *BSD and Darwin can return EAGAIN with n > 0,
+			// so check to see if the write has completed.
+			// So far as we know all other platforms only
+			// return EAGAIN when n == 0, but checking is harmless.
+			if size > 0 && written >= size {
+				return written, nil, true
+			}
+			if err = dstFD.pd.waitWrite(dstFD.isFile); err != nil {
+				return written, err, true
+			}
+		case syscall.EINTR:
+			// Retry.
+		case syscall.ENOSYS, syscall.EOPNOTSUPP, syscall.EINVAL:
+			// ENOSYS indicates no kernel support for sendfile.
+			// EINVAL indicates a FD type that does not support sendfile.
+			//
+			// On Linux, copy_file_range can return EOPNOTSUPP when copying
+			// to a NFS file (issue #40731); check for it here just in case.
+			return written, err, written > 0
+		default:
+			// We want to handle ENOTSUP like EOPNOTSUPP.
+			// It's a pain to put it as a switch case
+			// because on Linux systems ENOTSUP == EOPNOTSUPP,
+			// so the compiler complains about a duplicate case.
+			if err == syscall.ENOTSUP {
+				return written, err, written > 0
+			}
+
+			// Not a retryable error.
+			return written, err, true
+		}
+	}
+}
+
+func sendFileChunk(dst, src int, offset *int64, size int, written int64) (n int, err error) {
+	switch runtime.GOOS {
+	case "linux", "android":
+		// The offset is always nil on Linux.
+		n, err = syscall.Sendfile(dst, src, offset, size)
+	case "solaris", "illumos":
+		// Trust the offset, not the return value from sendfile.
+		start := *offset
+		n, err = syscall.Sendfile(dst, src, offset, size)
+		n = int(*offset - start)
+		// A quirk on Solaris/illumos: sendfile claims to support out_fd
+		// as a regular file but returns EINVAL when the out_fd
+		// is not a socket of SOCK_STREAM, while it actually sends
+		// out data anyway and updates the file offset.
+		//
+		// Another quirk: sendfile transfers data and returns EINVAL when being
+		// asked to transfer bytes more than the actual file size. For instance,
+		// the source file is wrapped in an io.LimitedReader with larger size
+		// than the actual file size.
+		//
+		// To handle these cases we ignore EINVAL if any call to sendfile was
+		// able to send data.
+		if err == syscall.EINVAL && (n > 0 || written > 0) {
+			err = nil
+		}
+	default:
+		start := *offset
+		n, err = syscall.Sendfile(dst, src, offset, size)
+		if n > 0 {
+			// The BSD implementations of syscall.Sendfile don't
+			// update the offset parameter (despite it being a *int64).
+			//
+			// Trust the return value from sendfile, not the offset.
+			*offset = start + int64(n)
+		}
+	}
+	return
+}
diff --git a/src/internal/poll/sock_cloexec.go b/src/internal/poll/sock_cloexec.go
index cbf70218..466ee313 100644
--- a/src/internal/poll/sock_cloexec.go
+++ b/src/internal/poll/sock_cloexec.go
@@ -5,7 +5,7 @@
 // This file implements accept for platforms that provide a fast path for
 // setting SetNonblock and CloseOnExec.
 
-//go:build dragonfly || freebsd || (linux && !arm) || netbsd || openbsd
+//go:build dragonfly || freebsd || linux || netbsd || openbsd
 
 package poll
 
diff --git a/src/internal/poll/sock_cloexec_accept.go b/src/internal/poll/sock_cloexec_accept.go
deleted file mode 100644
index 4b86de59..00000000
--- a/src/internal/poll/sock_cloexec_accept.go
+++ /dev/null
@@ -1,51 +0,0 @@
-// Copyright 2013 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// This file implements accept for platforms that provide a fast path for
-// setting SetNonblock and CloseOnExec, but don't necessarily have accept4.
-// This is the code we used for accept in Go 1.17 and earlier.
-// On Linux the accept4 system call was introduced in 2.6.28 kernel,
-// and our minimum requirement is 2.6.32, so we simplified the function.
-// Unfortunately, on ARM accept4 wasn't added until 2.6.36, so for ARM
-// only we continue using the older code.
-
-//go:build linux && arm
-
-package poll
-
-import "syscall"
-
-// Wrapper around the accept system call that marks the returned file
-// descriptor as nonblocking and close-on-exec.
-func accept(s int) (int, syscall.Sockaddr, string, error) {
-	ns, sa, err := Accept4Func(s, syscall.SOCK_NONBLOCK|syscall.SOCK_CLOEXEC)
-	switch err {
-	case nil:
-		return ns, sa, "", nil
-	default: // errors other than the ones listed
-		return -1, sa, "accept4", err
-	case syscall.ENOSYS: // syscall missing
-	case syscall.EINVAL: // some Linux use this instead of ENOSYS
-	case syscall.EACCES: // some Linux use this instead of ENOSYS
-	case syscall.EFAULT: // some Linux use this instead of ENOSYS
-	}
-
-	// See ../syscall/exec_unix.go for description of ForkLock.
-	// It is probably okay to hold the lock across syscall.Accept
-	// because we have put fd.sysfd into non-blocking mode.
-	// However, a call to the File method will put it back into
-	// blocking mode. We can't take that risk, so no use of ForkLock here.
-	ns, sa, err = AcceptFunc(s)
-	if err == nil {
-		syscall.CloseOnExec(ns)
-	}
-	if err != nil {
-		return -1, nil, "accept", err
-	}
-	if err = syscall.SetNonblock(ns, true); err != nil {
-		CloseFunc(ns)
-		return -1, nil, "setnonblock", err
-	}
-	return ns, sa, "", nil
-}
diff --git a/src/internal/profile/proto_test.go b/src/internal/profile/proto_test.go
index 46c6d830..4c09f7c4 100644
--- a/src/internal/profile/proto_test.go
+++ b/src/internal/profile/proto_test.go
@@ -5,7 +5,7 @@
 package profile
 
 import (
-	"reflect"
+	"slices"
 	"testing"
 )
 
@@ -34,7 +34,7 @@ func TestPackedEncoding(t *testing.T) {
 		},
 	} {
 		source := &packedInts{tc.uint64s, tc.int64s}
-		if got, want := marshal(source), tc.encoded; !reflect.DeepEqual(got, want) {
+		if got, want := marshal(source), tc.encoded; !slices.Equal(got, want) {
 			t.Errorf("failed encode %d, got %v, want %v", i, got, want)
 		}
 
@@ -43,10 +43,10 @@ func TestPackedEncoding(t *testing.T) {
 			t.Errorf("failed decode %d: %v", i, err)
 			continue
 		}
-		if got, want := dest.uint64s, tc.uint64s; !reflect.DeepEqual(got, want) {
+		if got, want := dest.uint64s, tc.uint64s; !slices.Equal(got, want) {
 			t.Errorf("failed decode uint64s %d, got %v, want %v", i, got, want)
 		}
-		if got, want := dest.int64s, tc.int64s; !reflect.DeepEqual(got, want) {
+		if got, want := dest.int64s, tc.int64s; !slices.Equal(got, want) {
 			t.Errorf("failed decode int64s %d, got %v, want %v", i, got, want)
 		}
 	}
diff --git a/src/internal/race/norace.go b/src/internal/race/norace.go
index da650489..3fb00573 100644
--- a/src/internal/race/norace.go
+++ b/src/internal/race/norace.go
@@ -7,6 +7,7 @@
 package race
 
 import (
+	"internal/abi"
 	"unsafe"
 )
 
@@ -30,9 +31,21 @@ func Enable() {
 func Read(addr unsafe.Pointer) {
 }
 
+func ReadPC(addr unsafe.Pointer, callerpc, pc uintptr) {
+}
+
+func ReadObjectPC(t *abi.Type, addr unsafe.Pointer, callerpc, pc uintptr) {
+}
+
 func Write(addr unsafe.Pointer) {
 }
 
+func WritePC(addr unsafe.Pointer, callerpc, pc uintptr) {
+}
+
+func WriteObjectPC(t *abi.Type, addr unsafe.Pointer, callerpc, pc uintptr) {
+}
+
 func ReadRange(addr unsafe.Pointer, len int) {
 }
 
diff --git a/src/internal/race/race.go b/src/internal/race/race.go
index d2c7e53e..bfcb24a2 100644
--- a/src/internal/race/race.go
+++ b/src/internal/race/race.go
@@ -7,48 +7,52 @@
 package race
 
 import (
-	"runtime"
+	"internal/abi"
 	"unsafe"
 )
 
 const Enabled = true
 
-func Acquire(addr unsafe.Pointer) {
-	runtime.RaceAcquire(addr)
-}
+// Functions below pushed from runtime.
 
-func Release(addr unsafe.Pointer) {
-	runtime.RaceRelease(addr)
-}
+//go:linkname Acquire
+func Acquire(addr unsafe.Pointer)
 
-func ReleaseMerge(addr unsafe.Pointer) {
-	runtime.RaceReleaseMerge(addr)
-}
+//go:linkname Release
+func Release(addr unsafe.Pointer)
 
-func Disable() {
-	runtime.RaceDisable()
-}
+//go:linkname ReleaseMerge
+func ReleaseMerge(addr unsafe.Pointer)
 
-func Enable() {
-	runtime.RaceEnable()
-}
+//go:linkname Disable
+func Disable()
 
-func Read(addr unsafe.Pointer) {
-	runtime.RaceRead(addr)
-}
+//go:linkname Enable
+func Enable()
 
-func Write(addr unsafe.Pointer) {
-	runtime.RaceWrite(addr)
-}
+//go:linkname Read
+func Read(addr unsafe.Pointer)
 
-func ReadRange(addr unsafe.Pointer, len int) {
-	runtime.RaceReadRange(addr, len)
-}
+//go:linkname ReadPC
+func ReadPC(addr unsafe.Pointer, callerpc, pc uintptr)
 
-func WriteRange(addr unsafe.Pointer, len int) {
-	runtime.RaceWriteRange(addr, len)
-}
+//go:linkname ReadObjectPC
+func ReadObjectPC(t *abi.Type, addr unsafe.Pointer, callerpc, pc uintptr)
 
-func Errors() int {
-	return runtime.RaceErrors()
-}
+//go:linkname Write
+func Write(addr unsafe.Pointer)
+
+//go:linkname WritePC
+func WritePC(addr unsafe.Pointer, callerpc, pc uintptr)
+
+//go:linkname WriteObjectPC
+func WriteObjectPC(t *abi.Type, addr unsafe.Pointer, callerpc, pc uintptr)
+
+//go:linkname ReadRange
+func ReadRange(addr unsafe.Pointer, len int)
+
+//go:linkname WriteRange
+func WriteRange(addr unsafe.Pointer, len int)
+
+//go:linkname Errors
+func Errors() int
diff --git a/src/internal/runtime/atomic/atomic_386.go b/src/internal/runtime/atomic/atomic_386.go
index a023badd..b6cdea61 100644
--- a/src/internal/runtime/atomic/atomic_386.go
+++ b/src/internal/runtime/atomic/atomic_386.go
@@ -53,6 +53,9 @@ func Xchg64(ptr *uint64, new uint64) uint64
 //go:noescape
 func Xchg(ptr *uint32, new uint32) uint32
 
+//go:noescape
+func Xchg8(ptr *uint8, new uint8) uint8
+
 //go:noescape
 func Xchguintptr(ptr *uintptr, new uintptr) uintptr
 
diff --git a/src/internal/runtime/atomic/atomic_386.s b/src/internal/runtime/atomic/atomic_386.s
index 08812c37..58a56e63 100644
--- a/src/internal/runtime/atomic/atomic_386.s
+++ b/src/internal/runtime/atomic/atomic_386.s
@@ -153,6 +153,14 @@ addloop:
 	MOVL	CX, ret_hi+16(FP)
 	RET
 
+// uint8 Xchg8(uint8 *ptr, uint8 new)
+TEXT ·Xchg8(SB), NOSPLIT, $0-9
+	MOVL	ptr+0(FP), BX
+	MOVB	new+4(FP), AX
+	XCHGB	AX, 0(BX)
+	MOVB	AX, ret+8(FP)
+	RET
+
 TEXT ·Xchg(SB), NOSPLIT, $0-12
 	MOVL	ptr+0(FP), BX
 	MOVL	new+4(FP), AX
diff --git a/src/internal/runtime/atomic/atomic_amd64.go b/src/internal/runtime/atomic/atomic_amd64.go
index b4399540..2a2d07e5 100644
--- a/src/internal/runtime/atomic/atomic_amd64.go
+++ b/src/internal/runtime/atomic/atomic_amd64.go
@@ -57,6 +57,9 @@ func Xadd64(ptr *uint64, delta int64) uint64
 //go:noescape
 func Xadduintptr(ptr *uintptr, delta uintptr) uintptr
 
+//go:noescape
+func Xchg8(ptr *uint8, new uint8) uint8
+
 //go:noescape
 func Xchg(ptr *uint32, new uint32) uint32
 
diff --git a/src/internal/runtime/atomic/atomic_amd64.s b/src/internal/runtime/atomic/atomic_amd64.s
index ec75bf93..d6dc7a32 100644
--- a/src/internal/runtime/atomic/atomic_amd64.s
+++ b/src/internal/runtime/atomic/atomic_amd64.s
@@ -117,6 +117,18 @@ TEXT ·Xaddint64(SB), NOSPLIT, $0-24
 TEXT ·Xadduintptr(SB), NOSPLIT, $0-24
 	JMP	·Xadd64(SB)
 
+// uint8 Xchg(ptr *uint8, new uint8)
+// Atomically:
+//	old := *ptr;
+//	*ptr = new;
+//	return old;
+TEXT ·Xchg8(SB), NOSPLIT, $0-17
+	MOVQ	ptr+0(FP), BX
+	MOVB	new+8(FP), AX
+	XCHGB	AX, 0(BX)
+	MOVB	AX, ret+16(FP)
+	RET
+
 // uint32 Xchg(ptr *uint32, new uint32)
 // Atomically:
 //	old := *ptr;
diff --git a/src/internal/runtime/atomic/atomic_arm.go b/src/internal/runtime/atomic/atomic_arm.go
index b58f643c..8d8ffcf7 100644
--- a/src/internal/runtime/atomic/atomic_arm.go
+++ b/src/internal/runtime/atomic/atomic_arm.go
@@ -74,6 +74,27 @@ func Xchg(addr *uint32, v uint32) uint32 {
 	}
 }
 
+//go:noescape
+func Xchg8(addr *uint8, v uint8) uint8
+
+//go:nosplit
+func goXchg8(addr *uint8, v uint8) uint8 {
+	// Align down to 4 bytes and use 32-bit CAS.
+	addr32 := (*uint32)(unsafe.Pointer(uintptr(unsafe.Pointer(addr)) &^ 3))
+	shift := (uintptr(unsafe.Pointer(addr)) & 3) * 8 // little endian
+	word := uint32(v) << shift
+	mask := uint32(0xFF) << shift
+
+	for {
+		old := *addr32 // Read the old 32-bit value
+		// Clear the old 8 bits then insert the new value
+		if Cas(addr32, old, (old&^mask)|word) {
+			// Return the old 8-bit value
+			return uint8((old & mask) >> shift)
+		}
+	}
+}
+
 //go:nosplit
 func Xchguintptr(addr *uintptr, v uintptr) uintptr {
 	return uintptr(Xchg((*uint32)(unsafe.Pointer(addr)), uint32(v)))
@@ -159,12 +180,14 @@ func goStore64(addr *uint64, v uint64) {
 	addrLock(addr).unlock()
 }
 
+//go:noescape
+func Or8(addr *uint8, v uint8)
+
 //go:nosplit
-func Or8(addr *uint8, v uint8) {
+func goOr8(addr *uint8, v uint8) {
 	// Align down to 4 bytes and use 32-bit CAS.
-	uaddr := uintptr(unsafe.Pointer(addr))
-	addr32 := (*uint32)(unsafe.Pointer(uaddr &^ 3))
-	word := uint32(v) << ((uaddr & 3) * 8) // little endian
+	addr32 := (*uint32)(unsafe.Pointer(uintptr(unsafe.Pointer(addr)) &^ 3))
+	word := uint32(v) << ((uintptr(unsafe.Pointer(addr)) & 3) * 8) // little endian
 	for {
 		old := *addr32
 		if Cas(addr32, old, old|word) {
@@ -173,13 +196,15 @@ func Or8(addr *uint8, v uint8) {
 	}
 }
 
+//go:noescape
+func And8(addr *uint8, v uint8)
+
 //go:nosplit
-func And8(addr *uint8, v uint8) {
+func goAnd8(addr *uint8, v uint8) {
 	// Align down to 4 bytes and use 32-bit CAS.
-	uaddr := uintptr(unsafe.Pointer(addr))
-	addr32 := (*uint32)(unsafe.Pointer(uaddr &^ 3))
-	word := uint32(v) << ((uaddr & 3) * 8)    // little endian
-	mask := uint32(0xFF) << ((uaddr & 3) * 8) // little endian
+	addr32 := (*uint32)(unsafe.Pointer(uintptr(unsafe.Pointer(addr)) &^ 3))
+	word := uint32(v) << ((uintptr(unsafe.Pointer(addr)) & 3) * 8)    // little endian
+	mask := uint32(0xFF) << ((uintptr(unsafe.Pointer(addr)) & 3) * 8) // little endian
 	word |= ^mask
 	for {
 		old := *addr32
diff --git a/src/internal/runtime/atomic/atomic_arm.s b/src/internal/runtime/atomic/atomic_arm.s
index 1cf7d8f6..85cee049 100644
--- a/src/internal/runtime/atomic/atomic_arm.s
+++ b/src/internal/runtime/atomic/atomic_arm.s
@@ -228,6 +228,59 @@ store64loop:
 	DMB	MB_ISH
 	RET
 
+TEXT armAnd8<>(SB),NOSPLIT,$0-5
+	// addr is already in R1
+	MOVB	v+4(FP), R2
+
+and8loop:
+	LDREXB	(R1), R6
+
+	DMB	MB_ISHST
+
+	AND 	R2, R6
+	STREXB	R6, (R1), R0
+	CMP	$0, R0
+	BNE	and8loop
+
+	DMB	MB_ISH
+
+	RET
+
+TEXT armOr8<>(SB),NOSPLIT,$0-5
+	// addr is already in R1
+	MOVB	v+4(FP), R2
+
+or8loop:
+	LDREXB	(R1), R6
+
+	DMB	MB_ISHST
+
+	ORR 	R2, R6
+	STREXB	R6, (R1), R0
+	CMP	$0, R0
+	BNE	or8loop
+
+	DMB	MB_ISH
+
+	RET
+
+TEXT armXchg8<>(SB),NOSPLIT,$0-9
+	// addr is already in R1
+	MOVB	v+4(FP), R2
+xchg8loop:
+	LDREXB	(R1), R6
+
+	DMB	MB_ISHST
+
+	STREXB	R2, (R1), R0
+	CMP	$0, R0
+	BNE	xchg8loop
+
+	DMB	MB_ISH
+
+	MOVB R6, ret+8(FP)
+	RET
+
 // The following functions all panic if their address argument isn't
 // 8-byte aligned. Since we're calling back into Go code to do this,
 // we have to cooperate with stack unwinding. In the normal case, the
@@ -310,3 +363,45 @@ TEXT ·Store64(SB),NOSPLIT,$-4-12
 	JMP	·goStore64(SB)
 #endif
 	JMP	armStore64<>(SB)
+
+TEXT ·And8(SB),NOSPLIT,$-4-5
+	NO_LOCAL_POINTERS
+	MOVW	addr+0(FP), R1
+
+// Uses STREXB/LDREXB that is armv6k or later.
+// For simplicity we only enable this on armv7.
+#ifndef GOARM_7
+	MOVB	internal∕cpu·ARM+const_offsetARMHasV7Atomics(SB), R11
+	CMP	$1, R11
+	BEQ	2(PC)
+	JMP	·goAnd8(SB)
+#endif
+	JMP	armAnd8<>(SB)
+
+TEXT ·Or8(SB),NOSPLIT,$-4-5
+	NO_LOCAL_POINTERS
+	MOVW	addr+0(FP), R1
+
+// Uses STREXB/LDREXB that is armv6k or later.
+// For simplicity we only enable this on armv7.
+#ifndef GOARM_7
+	MOVB	internal∕cpu·ARM+const_offsetARMHasV7Atomics(SB), R11
+	CMP	$1, R11
+	BEQ	2(PC)
+	JMP	·goOr8(SB)
+#endif
+	JMP	armOr8<>(SB)
+
+TEXT ·Xchg8(SB),NOSPLIT,$-4-9
+	NO_LOCAL_POINTERS
+	MOVW	addr+0(FP), R1
+
+	// Uses STREXB/LDREXB that is armv6k or later.
+	// For simplicity we only enable this on armv7.
+#ifndef GOARM_7
+	MOVB	internal∕cpu·ARM+const_offsetARMHasV7Atomics(SB), R11
+	CMP	$1, R11
+	BEQ	2(PC)
+	JMP	·goXchg8(SB)
+#endif
+	JMP	armXchg8<>(SB)
diff --git a/src/internal/runtime/atomic/atomic_arm64.go b/src/internal/runtime/atomic/atomic_arm64.go
index c4c56ae8..f4aef193 100644
--- a/src/internal/runtime/atomic/atomic_arm64.go
+++ b/src/internal/runtime/atomic/atomic_arm64.go
@@ -24,6 +24,9 @@ func Xadd64(ptr *uint64, delta int64) uint64
 //go:noescape
 func Xadduintptr(ptr *uintptr, delta uintptr) uintptr
 
+//go:noescape
+func Xchg8(ptr *uint8, new uint8) uint8
+
 //go:noescape
 func Xchg(ptr *uint32, new uint32) uint32
 
diff --git a/src/internal/runtime/atomic/atomic_arm64.s b/src/internal/runtime/atomic/atomic_arm64.s
index ede56538..09f3b53c 100644
--- a/src/internal/runtime/atomic/atomic_arm64.s
+++ b/src/internal/runtime/atomic/atomic_arm64.s
@@ -120,6 +120,30 @@ TEXT ·Store64(SB), NOSPLIT, $0-16
 	STLR	R1, (R0)
 	RET
 
+// uint8 Xchg(ptr *uint8, new uint8)
+// Atomically:
+//	old := *ptr;
+//	*ptr = new;
+//	return old;
+TEXT ·Xchg8(SB), NOSPLIT, $0-17
+	MOVD	ptr+0(FP), R0
+	MOVB	new+8(FP), R1
+#ifndef GOARM64_LSE
+	MOVBU	internal∕cpu·ARM64+const_offsetARM64HasATOMICS(SB), R4
+	CBZ 	R4, load_store_loop
+#endif
+	SWPALB	R1, (R0), R2
+	MOVB	R2, ret+16(FP)
+	RET
+#ifndef GOARM64_LSE
+load_store_loop:
+	LDAXRB	(R0), R2
+	STLXRB	R1, (R0), R3
+	CBNZ	R3, load_store_loop
+	MOVB	R2, ret+16(FP)
+	RET
+#endif
+
 // uint32 Xchg(ptr *uint32, new uint32)
 // Atomically:
 //	old := *ptr;
diff --git a/src/internal/runtime/atomic/atomic_loong64.go b/src/internal/runtime/atomic/atomic_loong64.go
index de6d4b4b..1fa1a9fa 100644
--- a/src/internal/runtime/atomic/atomic_loong64.go
+++ b/src/internal/runtime/atomic/atomic_loong64.go
@@ -6,7 +6,15 @@
 
 package atomic
 
-import "unsafe"
+import (
+	"internal/cpu"
+	"unsafe"
+)
+
+const (
+	offsetLOONG64HasLAMCAS = unsafe.Offsetof(cpu.Loong64.HasLAMCAS)
+	offsetLoong64HasLAM_BH = unsafe.Offsetof(cpu.Loong64.HasLAM_BH)
+)
 
 //go:noescape
 func Xadd(ptr *uint32, delta int32) uint32
@@ -17,6 +25,9 @@ func Xadd64(ptr *uint64, delta int64) uint64
 //go:noescape
 func Xadduintptr(ptr *uintptr, delta uintptr) uintptr
 
+//go:noescape
+func Xchg8(ptr *uint8, new uint8) uint8
+
 //go:noescape
 func Xchg(ptr *uint32, new uint32) uint32
 
diff --git a/src/internal/runtime/atomic/atomic_loong64.s b/src/internal/runtime/atomic/atomic_loong64.s
index 1812cb95..5222b77e 100644
--- a/src/internal/runtime/atomic/atomic_loong64.s
+++ b/src/internal/runtime/atomic/atomic_loong64.s
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+#include "go_asm.h"
 #include "textflag.h"
 
 // bool cas(uint32 *ptr, uint32 old, uint32 new)
@@ -15,18 +16,32 @@ TEXT ·Cas(SB), NOSPLIT, $0-17
 	MOVV	ptr+0(FP), R4
 	MOVW	old+8(FP), R5
 	MOVW	new+12(FP), R6
-	DBAR
+
+	MOVBU	internal∕cpu·Loong64+const_offsetLOONG64HasLAMCAS(SB), R8
+	BEQ	R8, cas_again
+	MOVV	R5, R7  // backup old value
+	AMCASDBW	R6, (R4), R5
+	BNE	R7, R5, cas_fail0
+	MOVV	$1, R4
+	MOVB	R4, ret+16(FP)
+	RET
+cas_fail0:
+	MOVB	R0, ret+16(FP)
+	RET
+
+	// Implemented using the ll-sc instruction pair
+	DBAR	$0x14	// LoadAcquire barrier
 cas_again:
 	MOVV	R6, R7
 	LL	(R4), R8
-	BNE	R5, R8, cas_fail
+	BNE	R5, R8, cas_fail1
 	SC	R7, (R4)
 	BEQ	R7, cas_again
 	MOVV	$1, R4
 	MOVB	R4, ret+16(FP)
-	DBAR
+	DBAR	$0x12	// StoreRelease barrier
 	RET
-cas_fail:
+cas_fail1:
 	MOVV	$0, R4
 	JMP	-4(PC)
 
@@ -42,21 +57,41 @@ TEXT ·Cas64(SB), NOSPLIT, $0-25
 	MOVV	ptr+0(FP), R4
 	MOVV	old+8(FP), R5
 	MOVV	new+16(FP), R6
-	DBAR
+
+	MOVBU	internal∕cpu·Loong64+const_offsetLOONG64HasLAMCAS(SB), R8
+	BEQ	R8, cas64_again
+	MOVV	R5, R7  // backup old value
+	AMCASDBV	R6, (R4), R5
+	BNE	R7, R5, cas64_fail0
+	MOVV	$1, R4
+	MOVB	R4, ret+24(FP)
+	RET
+cas64_fail0:
+	MOVB	R0, ret+24(FP)
+	RET
+
+	// Implemented using the ll-sc instruction pair
+	DBAR	$0x14
 cas64_again:
 	MOVV	R6, R7
 	LLV	(R4), R8
-	BNE	R5, R8, cas64_fail
+	BNE	R5, R8, cas64_fail1
 	SCV	R7, (R4)
 	BEQ	R7, cas64_again
 	MOVV	$1, R4
 	MOVB	R4, ret+24(FP)
-	DBAR
+	DBAR	$0x12
 	RET
-cas64_fail:
+cas64_fail1:
 	MOVV	$0, R4
 	JMP	-4(PC)
 
+TEXT ·Casint32(SB),NOSPLIT,$0-17
+	JMP	·Cas(SB)
+
+TEXT ·Casint64(SB),NOSPLIT,$0-25
+	JMP	·Cas64(SB)
+
 TEXT ·Casuintptr(SB), NOSPLIT, $0-25
 	JMP	·Cas64(SB)
 
@@ -78,6 +113,9 @@ TEXT ·Xadduintptr(SB), NOSPLIT, $0-24
 TEXT ·Loadint64(SB), NOSPLIT, $0-16
 	JMP	·Load64(SB)
 
+TEXT ·Xaddint32(SB),NOSPLIT,$0-20
+	JMP	·Xadd(SB)
+
 TEXT ·Xaddint64(SB), NOSPLIT, $0-24
 	JMP	·Xadd64(SB)
 
@@ -91,65 +129,92 @@ TEXT ·Xaddint64(SB), NOSPLIT, $0-24
 TEXT ·Casp1(SB), NOSPLIT, $0-25
 	JMP	·Cas64(SB)
 
-// uint32 xadd(uint32 volatile *ptr, int32 delta)
+// uint32 Xadd(uint32 volatile *ptr, int32 delta)
 // Atomically:
 //	*val += delta;
 //	return *val;
 TEXT ·Xadd(SB), NOSPLIT, $0-20
 	MOVV	ptr+0(FP), R4
 	MOVW	delta+8(FP), R5
-	DBAR
-	LL	(R4), R6
-	ADDU	R6, R5, R7
-	MOVV	R7, R6
-	SC	R7, (R4)
-	BEQ	R7, -4(PC)
-	MOVW	R6, ret+16(FP)
-	DBAR
+	AMADDDBW	R5, (R4), R6
+	ADDV	R6, R5, R4
+	MOVW	R4, ret+16(FP)
 	RET
 
+// func Xadd64(ptr *uint64, delta int64) uint64
 TEXT ·Xadd64(SB), NOSPLIT, $0-24
 	MOVV	ptr+0(FP), R4
 	MOVV	delta+8(FP), R5
-	DBAR
-	LLV	(R4), R6
-	ADDVU	R6, R5, R7
-	MOVV	R7, R6
-	SCV	R7, (R4)
-	BEQ	R7, -4(PC)
-	MOVV	R6, ret+16(FP)
-	DBAR
+	AMADDDBV	R5, (R4), R6
+	ADDV	R6, R5, R4
+	MOVV	R4, ret+16(FP)
 	RET
 
+// uint8 Xchg8(ptr *uint8, new uint8)
+// Atomically:
+//     old := *ptr;
+//     *ptr = new;
+//     return old;
+TEXT ·Xchg8(SB), NOSPLIT, $0-17
+	MOVV	ptr+0(FP), R4
+	MOVBU	new+8(FP), R5
+
+	// R6 = ((ptr & 3) * 8)
+	AND	$3, R4, R6
+	SLLV	$3, R6
+
+	// R7 = ((0xFF) << R6) ^ (-1)
+	MOVV	$0xFF, R8
+	SLLV	R6, R8, R7
+	XOR	$-1, R7
+
+	// R4 = ptr & (~3)
+	MOVV	$~3, R8
+	AND	R8, R4
+
+	// R5 = ((val) << R6)
+	SLLV	R6, R5
+
+	DBAR	$0x14	// LoadAcquire barrier
+_xchg8_again:
+	LL	(R4), R8
+	MOVV	R8, R9	// backup old val
+	AND	R7, R8
+	OR	R5, R8
+	SC	R8, (R4)
+	BEQ	R8, _xchg8_again
+	DBAR	$0x12	// StoreRelease barrier
+	SRLV	R6, R9, R9
+	MOVBU	R9, ret+16(FP)
+	RET
+
+// func Xchg(ptr *uint32, new uint32) uint32
 TEXT ·Xchg(SB), NOSPLIT, $0-20
 	MOVV	ptr+0(FP), R4
 	MOVW	new+8(FP), R5
-
-	DBAR
-	MOVV	R5, R6
-	LL	(R4), R7
-	SC	R6, (R4)
-	BEQ	R6, -3(PC)
-	MOVW	R7, ret+16(FP)
-	DBAR
+	AMSWAPDBW	R5, (R4), R6
+	MOVW	R6, ret+16(FP)
 	RET
 
+// func Xchg64(ptr *uint64, new uint64) uint64
 TEXT ·Xchg64(SB), NOSPLIT, $0-24
 	MOVV	ptr+0(FP), R4
 	MOVV	new+8(FP), R5
-
-	DBAR
-	MOVV	R5, R6
-	LLV	(R4), R7
-	SCV	R6, (R4)
-	BEQ	R6, -3(PC)
-	MOVV	R7, ret+16(FP)
-	DBAR
+	AMSWAPDBV	R5, (R4), R6
+	MOVV	R6, ret+16(FP)
 	RET
 
 TEXT ·Xchguintptr(SB), NOSPLIT, $0-24
 	JMP	·Xchg64(SB)
 
+// func Xchgint32(ptr *int32, new int32) int32
+TEXT ·Xchgint32(SB), NOSPLIT, $0-20
+	JMP	·Xchg(SB)
+
+// func Xchgint64(ptr *int64, new int64) int64
+TEXT ·Xchgint64(SB), NOSPLIT, $0-24
+	JMP	·Xchg64(SB)
+
 TEXT ·StorepNoWB(SB), NOSPLIT, $0-16
 	JMP	·Store64(SB)
 
@@ -165,147 +230,105 @@ TEXT ·StoreReluintptr(SB), NOSPLIT, $0-16
 TEXT ·Store(SB), NOSPLIT, $0-12
 	MOVV	ptr+0(FP), R4
 	MOVW	val+8(FP), R5
-	DBAR
-	MOVW	R5, 0(R4)
-	DBAR
+	AMSWAPDBW	R5, (R4), R0
 	RET
 
 TEXT ·Store8(SB), NOSPLIT, $0-9
 	MOVV	ptr+0(FP), R4
 	MOVB	val+8(FP), R5
-	DBAR
+	MOVBU	internal∕cpu·Loong64+const_offsetLoong64HasLAM_BH(SB), R6
+	BEQ	R6, _legacy_store8_
+	AMSWAPDBB	R5, (R4), R0
+	RET
+_legacy_store8_:
+	// StoreRelease barrier
+	DBAR	$0x12
 	MOVB	R5, 0(R4)
-	DBAR
+	DBAR	$0x18
 	RET
 
 TEXT ·Store64(SB), NOSPLIT, $0-16
 	MOVV	ptr+0(FP), R4
 	MOVV	val+8(FP), R5
-	DBAR
-	MOVV	R5, 0(R4)
-	DBAR
+	AMSWAPDBV	R5, (R4), R0
 	RET
 
 // void	Or8(byte volatile*, byte);
 TEXT ·Or8(SB), NOSPLIT, $0-9
 	MOVV	ptr+0(FP), R4
 	MOVBU	val+8(FP), R5
-	// Align ptr down to 4 bytes so we can use 32-bit load/store.
+	// R6 = ptr & (~3)
 	MOVV	$~3, R6
 	AND	R4, R6
 	// R7 = ((ptr & 3) * 8)
 	AND	$3, R4, R7
 	SLLV	$3, R7
-	// Shift val for aligned ptr. R5 = val << R4
+	// R5 = val << R7
 	SLLV	R7, R5
-
-	DBAR
-	LL	(R6), R7
-	OR	R5, R7
-	SC	R7, (R6)
-	BEQ	R7, -4(PC)
-	DBAR
+	AMORDBW	R5, (R6), R0
 	RET
 
 // void	And8(byte volatile*, byte);
 TEXT ·And8(SB), NOSPLIT, $0-9
 	MOVV	ptr+0(FP), R4
 	MOVBU	val+8(FP), R5
-	// Align ptr down to 4 bytes so we can use 32-bit load/store.
+	// R6 = ptr & (~3)
 	MOVV	$~3, R6
 	AND	R4, R6
 	// R7 = ((ptr & 3) * 8)
 	AND	$3, R4, R7
 	SLLV	$3, R7
-	// Shift val for aligned ptr. R5 = val << R7 | ^(0xFF << R7)
-	MOVV	$0xFF, R8
-	SLLV	R7, R5
-	SLLV	R7, R8
-	NOR	R0, R8
-	OR	R8, R5
-
-	DBAR
-	LL	(R6), R7
-	AND	R5, R7
-	SC	R7, (R6)
-	BEQ	R7, -4(PC)
-	DBAR
+	// R5 = ((val ^ 0xFF) << R7) ^ (-1)
+	XOR	$255, R5
+	SLLV	R7,  R5
+	XOR	$-1, R5
+	AMANDDBW	R5, (R6), R0
 	RET
 
 // func Or(addr *uint32, v uint32)
 TEXT ·Or(SB), NOSPLIT, $0-12
 	MOVV	ptr+0(FP), R4
 	MOVW	val+8(FP), R5
-	DBAR
-	LL	(R4), R6
-	OR	R5, R6
-	SC	R6, (R4)
-	BEQ	R6, -4(PC)
-	DBAR
+	AMORDBW	R5, (R4), R0
 	RET
 
 // func And(addr *uint32, v uint32)
 TEXT ·And(SB), NOSPLIT, $0-12
 	MOVV	ptr+0(FP), R4
 	MOVW	val+8(FP), R5
-	DBAR
-	LL	(R4), R6
-	AND	R5, R6
-	SC	R6, (R4)
-	BEQ	R6, -4(PC)
-	DBAR
+	AMANDDBW	R5, (R4), R0
 	RET
 
 // func Or32(addr *uint32, v uint32) old uint32
 TEXT ·Or32(SB), NOSPLIT, $0-20
 	MOVV	ptr+0(FP), R4
 	MOVW	val+8(FP), R5
-	DBAR
-	LL	(R4), R6
-	OR	R5, R6, R7
-	SC	R7, (R4)
-	BEQ	R7, -4(PC)
-	DBAR
-	MOVW R6, ret+16(FP)
+	AMORDBW R5, (R4), R6
+	MOVW	R6, ret+16(FP)
 	RET
 
 // func And32(addr *uint32, v uint32) old uint32
 TEXT ·And32(SB), NOSPLIT, $0-20
 	MOVV	ptr+0(FP), R4
 	MOVW	val+8(FP), R5
-	DBAR
-	LL	(R4), R6
-	AND	R5, R6, R7
-	SC	R7, (R4)
-	BEQ	R7, -4(PC)
-	DBAR
-	MOVW R6, ret+16(FP)
+	AMANDDBW	R5, (R4), R6
+	MOVW	R6, ret+16(FP)
 	RET
 
 // func Or64(addr *uint64, v uint64) old uint64
 TEXT ·Or64(SB), NOSPLIT, $0-24
 	MOVV	ptr+0(FP), R4
 	MOVV	val+8(FP), R5
-	DBAR
-	LLV	(R4), R6
-	OR	R5, R6, R7
-	SCV	R7, (R4)
-	BEQ	R7, -4(PC)
-	DBAR
-	MOVV R6, ret+16(FP)
+	AMORDBV	R5, (R4), R6
+	MOVV	R6, ret+16(FP)
 	RET
 
 // func And64(addr *uint64, v uint64) old uint64
 TEXT ·And64(SB), NOSPLIT, $0-24
 	MOVV	ptr+0(FP), R4
 	MOVV	val+8(FP), R5
-	DBAR
-	LLV	(R4), R6
-	AND	R5, R6, R7
-	SCV	R7, (R4)
-	BEQ	R7, -4(PC)
-	DBAR
-	MOVV R6, ret+16(FP)
+	AMANDDBV	R5, (R4), R6
+	MOVV	R6, ret+16(FP)
 	RET
 
 // func Anduintptr(addr *uintptr, v uintptr) old uintptr
@@ -319,38 +342,30 @@ TEXT ·Oruintptr(SB), NOSPLIT, $0-24
 // uint32 internal∕runtime∕atomic·Load(uint32 volatile* ptr)
 TEXT ·Load(SB),NOSPLIT|NOFRAME,$0-12
 	MOVV	ptr+0(FP), R19
-	DBAR
 	MOVWU	0(R19), R19
-	DBAR
+	DBAR	$0x14	// LoadAcquire barrier
 	MOVW	R19, ret+8(FP)
 	RET
 
 // uint8 internal∕runtime∕atomic·Load8(uint8 volatile* ptr)
 TEXT ·Load8(SB),NOSPLIT|NOFRAME,$0-9
 	MOVV	ptr+0(FP), R19
-	DBAR
 	MOVBU	0(R19), R19
-	DBAR
+	DBAR	$0x14
 	MOVB	R19, ret+8(FP)
 	RET
 
 // uint64 internal∕runtime∕atomic·Load64(uint64 volatile* ptr)
 TEXT ·Load64(SB),NOSPLIT|NOFRAME,$0-16
 	MOVV	ptr+0(FP), R19
-	DBAR
 	MOVV	0(R19), R19
-	DBAR
+	DBAR	$0x14
 	MOVV	R19, ret+8(FP)
 	RET
 
 // void *internal∕runtime∕atomic·Loadp(void *volatile *ptr)
 TEXT ·Loadp(SB),NOSPLIT|NOFRAME,$0-16
-	MOVV	ptr+0(FP), R19
-	DBAR
-	MOVV	0(R19), R19
-	DBAR
-	MOVV	R19, ret+8(FP)
-	RET
+	JMP     ·Load64(SB)
 
 // uint32 internal∕runtime∕atomic·LoadAcq(uint32 volatile* ptr)
 TEXT ·LoadAcq(SB),NOSPLIT|NOFRAME,$0-12
diff --git a/src/internal/runtime/atomic/atomic_ppc64x.go b/src/internal/runtime/atomic/atomic_ppc64x.go
index 33a92b53..590ba03e 100644
--- a/src/internal/runtime/atomic/atomic_ppc64x.go
+++ b/src/internal/runtime/atomic/atomic_ppc64x.go
@@ -17,6 +17,9 @@ func Xadd64(ptr *uint64, delta int64) uint64
 //go:noescape
 func Xadduintptr(ptr *uintptr, delta uintptr) uintptr
 
+//go:noescape
+func Xchg8(ptr *uint8, new uint8) uint8
+
 //go:noescape
 func Xchg(ptr *uint32, new uint32) uint32
 
diff --git a/src/internal/runtime/atomic/atomic_ppc64x.s b/src/internal/runtime/atomic/atomic_ppc64x.s
index 75635b93..184a30c9 100644
--- a/src/internal/runtime/atomic/atomic_ppc64x.s
+++ b/src/internal/runtime/atomic/atomic_ppc64x.s
@@ -236,6 +236,22 @@ TEXT ·Xadd64(SB), NOSPLIT, $0-24
 	MOVD	R3, ret+16(FP)
 	RET
 
+// uint8 Xchg(ptr *uint8, new uint8)
+// Atomically:
+//	old := *ptr;
+//	*ptr = new;
+//	return old;
+TEXT ·Xchg8(SB), NOSPLIT, $0-17
+	MOVD	ptr+0(FP), R4
+	MOVB	new+8(FP), R5
+	LWSYNC
+	LBAR	(R4), R3
+	STBCCC	R5, (R4)
+	BNE	-2(PC)
+	ISYNC
+	MOVB	R3, ret+16(FP)
+	RET
+
 // uint32 Xchg(ptr *uint32, new uint32)
 // Atomically:
 //	old := *ptr;
diff --git a/src/internal/runtime/atomic/bench_test.go b/src/internal/runtime/atomic/bench_test.go
index 798431cf..b5837c97 100644
--- a/src/internal/runtime/atomic/bench_test.go
+++ b/src/internal/runtime/atomic/bench_test.go
@@ -43,6 +43,22 @@ func BenchmarkAtomicStore(b *testing.B) {
 	}
 }
 
+func BenchmarkAtomicLoad8(b *testing.B) {
+	var x uint8
+	sink = &x
+	for i := 0; i < b.N; i++ {
+		atomic.Load8(&x)
+	}
+}
+
+func BenchmarkAtomicStore8(b *testing.B) {
+	var x uint8
+	sink = &x
+	for i := 0; i < b.N; i++ {
+		atomic.Store8(&x, 0)
+	}
+}
+
 func BenchmarkAnd8(b *testing.B) {
 	var x [512]uint8 // give byte its own cache line
 	sink = &x
diff --git a/src/internal/runtime/atomic/xchg8_test.go b/src/internal/runtime/atomic/xchg8_test.go
new file mode 100644
index 00000000..016ce819
--- /dev/null
+++ b/src/internal/runtime/atomic/xchg8_test.go
@@ -0,0 +1,59 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build 386 || amd64 || arm || arm64 || loong64 || ppc64 || ppc64le
+
+package atomic_test
+
+import (
+	"internal/runtime/atomic"
+	"testing"
+)
+
+func TestXchg8(t *testing.T) {
+	var a [16]uint8
+	for i := range a {
+		next := uint8(i + 50)
+		a[i] = next
+	}
+	b := a
+
+	// Compare behavior against non-atomic implementation. Expect the operation
+	// to work at any byte offset and to not clobber neighboring values.
+	for i := range a {
+		next := uint8(i + 100)
+		pa := atomic.Xchg8(&a[i], next)
+		pb := b[i]
+		b[i] = next
+		if pa != pb {
+			t.Errorf("atomic.Xchg8(a[%d]); %d != %d", i, pa, pb)
+		}
+		if a != b {
+			t.Errorf("after atomic.Xchg8(a[%d]); %d != %d", i, a, b)
+		}
+		if t.Failed() {
+			break
+		}
+	}
+}
+
+func BenchmarkXchg8(b *testing.B) {
+	var x [512]uint8 // give byte its own cache line
+	sink = &x
+	for i := 0; i < b.N; i++ {
+		atomic.Xchg8(&x[255], uint8(i))
+	}
+}
+
+func BenchmarkXchg8Parallel(b *testing.B) {
+	var x [512]uint8 // give byte its own cache line
+	sink = &x
+	b.RunParallel(func(pb *testing.PB) {
+		i := uint8(0)
+		for pb.Next() {
+			atomic.Xchg8(&x[255], i)
+			i++
+		}
+	})
+}
diff --git a/src/internal/runtime/maps/export_noswiss_test.go b/src/internal/runtime/maps/export_noswiss_test.go
new file mode 100644
index 00000000..333fc6ce
--- /dev/null
+++ b/src/internal/runtime/maps/export_noswiss_test.go
@@ -0,0 +1,51 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build !goexperiment.swissmap
+
+// This file allows non-GOEXPERIMENT=swissmap builds (i.e., old map builds) to
+// construct a swissmap table for running the tests in this package.
+
+package maps
+
+import (
+	"internal/abi"
+	"unsafe"
+)
+
+type instantiatedGroup[K comparable, V any] struct {
+	ctrls ctrlGroup
+	slots [abi.SwissMapGroupSlots]instantiatedSlot[K, V]
+}
+
+type instantiatedSlot[K comparable, V any] struct {
+	key  K
+	elem V
+}
+
+func newTestMapType[K comparable, V any]() *abi.SwissMapType {
+	var m map[K]V
+	mTyp := abi.TypeOf(m)
+	omt := (*abi.OldMapType)(unsafe.Pointer(mTyp))
+
+	var grp instantiatedGroup[K, V]
+	var slot instantiatedSlot[K, V]
+
+	mt := &abi.SwissMapType{
+		Key:       omt.Key,
+		Elem:      omt.Elem,
+		Group:     abi.TypeOf(grp),
+		Hasher:    omt.Hasher,
+		SlotSize:  unsafe.Sizeof(slot),
+		GroupSize: unsafe.Sizeof(grp),
+		ElemOff:   unsafe.Offsetof(slot.elem),
+	}
+	if omt.NeedKeyUpdate() {
+		mt.Flags |= abi.SwissMapNeedKeyUpdate
+	}
+	if omt.HashMightPanic() {
+		mt.Flags |= abi.SwissMapHashMightPanic
+	}
+	return mt
+}
diff --git a/src/internal/runtime/maps/export_swiss_test.go b/src/internal/runtime/maps/export_swiss_test.go
new file mode 100644
index 00000000..3c6faf5c
--- /dev/null
+++ b/src/internal/runtime/maps/export_swiss_test.go
@@ -0,0 +1,19 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build goexperiment.swissmap
+
+package maps
+
+import (
+	"internal/abi"
+	"unsafe"
+)
+
+func newTestMapType[K comparable, V any]() *abi.SwissMapType {
+	var m map[K]V
+	mTyp := abi.TypeOf(m)
+	mt := (*abi.SwissMapType)(unsafe.Pointer(mTyp))
+	return mt
+}
diff --git a/src/internal/runtime/maps/export_test.go b/src/internal/runtime/maps/export_test.go
new file mode 100644
index 00000000..2c7b05ea
--- /dev/null
+++ b/src/internal/runtime/maps/export_test.go
@@ -0,0 +1,124 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package maps
+
+import (
+	"internal/abi"
+	"unsafe"
+)
+
+type CtrlGroup = ctrlGroup
+
+const DebugLog = debugLog
+
+var AlignUpPow2 = alignUpPow2
+
+const MaxTableCapacity = maxTableCapacity
+const MaxAvgGroupLoad = maxAvgGroupLoad
+
+// This isn't equivalent to runtime.maxAlloc. It is fine for basic testing but
+// we can't properly test hint alloc overflows with this.
+const maxAllocTest = 1 << 30
+
+func NewTestMap[K comparable, V any](hint uintptr) (*Map, *abi.SwissMapType) {
+	mt := newTestMapType[K, V]()
+	return NewMap(mt, hint, nil, maxAllocTest), mt
+}
+
+func (m *Map) TableCount() int {
+	if m.dirLen <= 0 {
+		return 0
+	}
+	return m.dirLen
+}
+
+// Total group count, summed across all tables.
+func (m *Map) GroupCount() uint64 {
+	if m.dirLen <= 0 {
+		if m.dirPtr == nil {
+			return 0
+		}
+		return 1
+	}
+
+	var n uint64
+	var lastTab *table
+	for i := range m.dirLen {
+		t := m.directoryAt(uintptr(i))
+		if t == lastTab {
+			continue
+		}
+		lastTab = t
+		n += t.groups.lengthMask + 1
+	}
+	return n
+}
+
+// Return a key from a group containing no empty slots.
+//
+// Returns nil if there are no full groups.
+// Returns nil if a group is full but contains entirely deleted slots.
+// Returns nil if the map is small.
+func (m *Map) KeyFromFullGroup(typ *abi.SwissMapType) unsafe.Pointer {
+	if m.dirLen <= 0 {
+		return nil
+	}
+
+	var lastTab *table
+	for i := range m.dirLen {
+		t := m.directoryAt(uintptr(i))
+		if t == lastTab {
+			continue
+		}
+		lastTab = t
+
+		for i := uint64(0); i <= t.groups.lengthMask; i++ {
+			g := t.groups.group(typ, i)
+			match := g.ctrls().matchEmpty()
+			if match != 0 {
+				continue
+			}
+
+			// All full or deleted slots.
+			for j := uintptr(0); j < abi.SwissMapGroupSlots; j++ {
+				if g.ctrls().get(j) == ctrlDeleted {
+					continue
+				}
+				slotKey := g.key(typ, j)
+				if typ.IndirectKey() {
+					slotKey = *((*unsafe.Pointer)(slotKey))
+				}
+				return slotKey
+			}
+		}
+	}
+
+	return nil
+}
+
+// Returns nil if the map is small.
+func (m *Map) TableFor(typ *abi.SwissMapType, key unsafe.Pointer) *table {
+	if m.dirLen <= 0 {
+		return nil
+	}
+
+	hash := typ.Hasher(key, m.seed)
+	idx := m.directoryIndex(hash)
+	return m.directoryAt(idx)
+}
+
+func (t *table) GrowthLeft() uint64 {
+	return uint64(t.growthLeft)
+}
+
+// Returns the start address of the groups array.
+func (t *table) GroupsStart() unsafe.Pointer {
+	return t.groups.data
+}
+
+// Returns the length of the groups array.
+func (t *table) GroupsLength() uintptr {
+	return uintptr(t.groups.lengthMask + 1)
+}
diff --git a/src/internal/runtime/maps/fuzz_test.go b/src/internal/runtime/maps/fuzz_test.go
new file mode 100644
index 00000000..f3f33773
--- /dev/null
+++ b/src/internal/runtime/maps/fuzz_test.go
@@ -0,0 +1,212 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package maps implements Go's builtin map type.
+package maps_test
+
+import (
+	"bytes"
+	"encoding/binary"
+	"fmt"
+	"internal/runtime/maps"
+	"reflect"
+	"testing"
+	"unsafe"
+)
+
+// The input to FuzzTable is a binary-encoded array of fuzzCommand structs.
+//
+// Each fuzz call begins with an empty Map[uint16, uint32].
+//
+// Each command is then executed on the map in sequence. Operations with
+// output (e.g., Get) are verified against a reference map.
+type fuzzCommand struct {
+	Op fuzzOp
+
+	// Used for Get, Put, Delete.
+	Key uint16
+
+	// Used for Put.
+	Elem uint32
+}
+
+// Encoded size of fuzzCommand.
+var fuzzCommandSize = binary.Size(fuzzCommand{})
+
+type fuzzOp uint8
+
+const (
+	fuzzOpGet fuzzOp = iota
+	fuzzOpPut
+	fuzzOpDelete
+)
+
+func encode(fc []fuzzCommand) []byte {
+	var buf bytes.Buffer
+	if err := binary.Write(&buf, binary.LittleEndian, fc); err != nil {
+		panic(fmt.Sprintf("error writing %v: %v", fc, err))
+	}
+	return buf.Bytes()
+}
+
+func decode(b []byte) []fuzzCommand {
+	// Round b down to a multiple of fuzzCommand size. i.e., ignore extra
+	// bytes of input.
+	entries := len(b) / fuzzCommandSize
+	usefulSize := entries * fuzzCommandSize
+	b = b[:usefulSize]
+
+	fc := make([]fuzzCommand, entries)
+	buf := bytes.NewReader(b)
+	if err := binary.Read(buf, binary.LittleEndian, &fc); err != nil {
+		panic(fmt.Sprintf("error reading %v: %v", b, err))
+	}
+
+	return fc
+}
+
+func TestEncodeDecode(t *testing.T) {
+	fc := []fuzzCommand{
+		{
+			Op:   fuzzOpPut,
+			Key:  123,
+			Elem: 456,
+		},
+		{
+			Op:  fuzzOpGet,
+			Key: 123,
+		},
+	}
+
+	b := encode(fc)
+	got := decode(b)
+	if !reflect.DeepEqual(fc, got) {
+		t.Errorf("encode-decode roundtrip got %+v want %+v", got, fc)
+	}
+
+	// Extra trailing bytes ignored.
+	b = append(b, 42)
+	got = decode(b)
+	if !reflect.DeepEqual(fc, got) {
+		t.Errorf("encode-decode (extra byte) roundtrip got %+v want %+v", got, fc)
+	}
+}
+
+func FuzzTable(f *testing.F) {
+	// All of the ops.
+	f.Add(encode([]fuzzCommand{
+		{
+			Op:   fuzzOpPut,
+			Key:  123,
+			Elem: 456,
+		},
+		{
+			Op:  fuzzOpDelete,
+			Key: 123,
+		},
+		{
+			Op:  fuzzOpGet,
+			Key: 123,
+		},
+	}))
+
+	// Add enough times to trigger grow.
+	f.Add(encode([]fuzzCommand{
+		{
+			Op:   fuzzOpPut,
+			Key:  1,
+			Elem: 101,
+		},
+		{
+			Op:   fuzzOpPut,
+			Key:  2,
+			Elem: 102,
+		},
+		{
+			Op:   fuzzOpPut,
+			Key:  3,
+			Elem: 103,
+		},
+		{
+			Op:   fuzzOpPut,
+			Key:  4,
+			Elem: 104,
+		},
+		{
+			Op:   fuzzOpPut,
+			Key:  5,
+			Elem: 105,
+		},
+		{
+			Op:   fuzzOpPut,
+			Key:  6,
+			Elem: 106,
+		},
+		{
+			Op:   fuzzOpPut,
+			Key:  7,
+			Elem: 107,
+		},
+		{
+			Op:   fuzzOpPut,
+			Key:  8,
+			Elem: 108,
+		},
+		{
+			Op:  fuzzOpGet,
+			Key: 1,
+		},
+		{
+			Op:  fuzzOpDelete,
+			Key: 2,
+		},
+		{
+			Op:   fuzzOpPut,
+			Key:  2,
+			Elem: 42,
+		},
+		{
+			Op:  fuzzOpGet,
+			Key: 2,
+		},
+	}))
+
+	f.Fuzz(func(t *testing.T, in []byte) {
+		fc := decode(in)
+		if len(fc) == 0 {
+			return
+		}
+
+		m, typ := maps.NewTestMap[uint16, uint32](8)
+		ref := make(map[uint16]uint32)
+		for _, c := range fc {
+			switch c.Op {
+			case fuzzOpGet:
+				elemPtr, ok := m.Get(typ, unsafe.Pointer(&c.Key))
+				refElem, refOK := ref[c.Key]
+
+				if ok != refOK {
+					t.Errorf("Get(%d) got ok %v want ok %v", c.Key, ok, refOK)
+				}
+				if !ok {
+					continue
+				}
+				gotElem := *(*uint32)(elemPtr)
+				if gotElem != refElem {
+					t.Errorf("Get(%d) got %d want %d", c.Key, gotElem, refElem)
+				}
+			case fuzzOpPut:
+				m.Put(typ, unsafe.Pointer(&c.Key), unsafe.Pointer(&c.Elem))
+				ref[c.Key] = c.Elem
+			case fuzzOpDelete:
+				m.Delete(typ, unsafe.Pointer(&c.Key))
+				delete(ref, c.Key)
+			default:
+				// Just skip this command to keep the fuzzer
+				// less constrained.
+				continue
+			}
+		}
+	})
+}
diff --git a/src/internal/runtime/maps/group.go b/src/internal/runtime/maps/group.go
new file mode 100644
index 00000000..f3e9d4d1
--- /dev/null
+++ b/src/internal/runtime/maps/group.go
@@ -0,0 +1,324 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package maps
+
+import (
+	"internal/abi"
+	"internal/goarch"
+	"internal/runtime/sys"
+	"unsafe"
+)
+
+const (
+	// Maximum load factor prior to growing.
+	//
+	// 7/8 is the same load factor used by Abseil, but Abseil defaults to
+	// 16 slots per group, so they get two empty slots vs our one empty
+	// slot. We may want to reevaluate if this is best for us.
+	maxAvgGroupLoad = 7
+
+	ctrlEmpty   ctrl = 0b10000000
+	ctrlDeleted ctrl = 0b11111110
+
+	bitsetLSB     = 0x0101010101010101
+	bitsetMSB     = 0x8080808080808080
+	bitsetEmpty   = bitsetLSB * uint64(ctrlEmpty)
+	bitsetDeleted = bitsetLSB * uint64(ctrlDeleted)
+)
+
+// bitset represents a set of slots within a group.
+//
+// The underlying representation depends on GOARCH.
+//
+// On AMD64, bitset uses one bit per slot, where the bit is set if the slot is
+// part of the set. All of the ctrlGroup.match* methods are replaced with
+// intrinsics that return this packed representation.
+//
+// On other architectures, bitset uses one byte per slot, where each byte is
+// either 0x80 if the slot is part of the set or 0x00 otherwise. This makes it
+// convenient to calculate for an entire group at once using standard
+// arithemetic instructions.
+type bitset uint64
+
+// first returns the relative index of the first control byte in the group that
+// is in the set.
+//
+// Preconditions: b is not 0 (empty).
+func (b bitset) first() uintptr {
+	return bitsetFirst(b)
+}
+
+// Portable implementation of first.
+//
+// On AMD64, this is replaced with an intrisic that simply does
+// TrailingZeros64. There is no need to shift as the bitset is packed.
+func bitsetFirst(b bitset) uintptr {
+	return uintptr(sys.TrailingZeros64(uint64(b))) >> 3
+}
+
+// removeFirst clears the first set bit (that is, resets the least significant
+// set bit to 0).
+func (b bitset) removeFirst() bitset {
+	return b & (b - 1)
+}
+
+// removeBelow clears all set bits below slot i (non-inclusive).
+func (b bitset) removeBelow(i uintptr) bitset {
+	return bitsetRemoveBelow(b, i)
+}
+
+// Portable implementation of removeBelow.
+//
+// On AMD64, this is replaced with an intrisic that clears the lower i bits.
+func bitsetRemoveBelow(b bitset, i uintptr) bitset {
+	// Clear all bits below slot i's byte.
+	mask := (uint64(1) << (8 * uint64(i))) - 1
+	return b &^ bitset(mask)
+}
+
+// lowestSet returns true if the bit is set for the lowest index in the bitset.
+//
+// This is intended for use with shiftOutLowest to loop over all entries in the
+// bitset regardless of whether they are set.
+func (b bitset) lowestSet() bool {
+	return bitsetLowestSet(b)
+}
+
+// Portable implementation of lowestSet.
+//
+// On AMD64, this is replaced with an intrisic that checks the lowest bit.
+func bitsetLowestSet(b bitset) bool {
+	return b&(1<<7) != 0
+}
+
+// shiftOutLowest shifts the lowest entry out of the bitset. Afterwards, the
+// lowest entry in the bitset corresponds to the next slot.
+func (b bitset) shiftOutLowest() bitset {
+	return bitsetShiftOutLowest(b)
+}
+
+// Portable implementation of shiftOutLowest.
+//
+// On AMD64, this is replaced with an intrisic that shifts a single bit.
+func bitsetShiftOutLowest(b bitset) bitset {
+	return b >> 8
+}
+
+// Each slot in the hash table has a control byte which can have one of three
+// states: empty, deleted, and full. They have the following bit patterns:
+//
+//	  empty: 1 0 0 0 0 0 0 0
+//	deleted: 1 1 1 1 1 1 1 0
+//	   full: 0 h h h h h h h  // h represents the H1 hash bits
+//
+// TODO(prattmic): Consider inverting the top bit so that the zero value is empty.
+type ctrl uint8
+
+// ctrlGroup is a fixed size array of abi.SwissMapGroupSlots control bytes
+// stored in a uint64.
+type ctrlGroup uint64
+
+// get returns the i-th control byte.
+func (g *ctrlGroup) get(i uintptr) ctrl {
+	if goarch.BigEndian {
+		return *(*ctrl)(unsafe.Add(unsafe.Pointer(g), 7-i))
+	}
+	return *(*ctrl)(unsafe.Add(unsafe.Pointer(g), i))
+}
+
+// set sets the i-th control byte.
+func (g *ctrlGroup) set(i uintptr, c ctrl) {
+	if goarch.BigEndian {
+		*(*ctrl)(unsafe.Add(unsafe.Pointer(g), 7-i)) = c
+		return
+	}
+	*(*ctrl)(unsafe.Add(unsafe.Pointer(g), i)) = c
+}
+
+// setEmpty sets all the control bytes to empty.
+func (g *ctrlGroup) setEmpty() {
+	*g = ctrlGroup(bitsetEmpty)
+}
+
+// matchH2 returns the set of slots which are full and for which the 7-bit hash
+// matches the given value. May return false positives.
+func (g ctrlGroup) matchH2(h uintptr) bitset {
+	return ctrlGroupMatchH2(g, h)
+}
+
+// Portable implementation of matchH2.
+//
+// Note: On AMD64, this is an intrinsic implemented with SIMD instructions. See
+// note on bitset about the packed instrinsified return value.
+func ctrlGroupMatchH2(g ctrlGroup, h uintptr) bitset {
+	// NB: This generic matching routine produces false positive matches when
+	// h is 2^N and the control bytes have a seq of 2^N followed by 2^N+1. For
+	// example: if ctrls==0x0302 and h=02, we'll compute v as 0x0100. When we
+	// subtract off 0x0101 the first 2 bytes we'll become 0xffff and both be
+	// considered matches of h. The false positive matches are not a problem,
+	// just a rare inefficiency. Note that they only occur if there is a real
+	// match and never occur on ctrlEmpty, or ctrlDeleted. The subsequent key
+	// comparisons ensure that there is no correctness issue.
+	v := uint64(g) ^ (bitsetLSB * uint64(h))
+	return bitset(((v - bitsetLSB) &^ v) & bitsetMSB)
+}
+
+// matchEmpty returns the set of slots in the group that are empty.
+func (g ctrlGroup) matchEmpty() bitset {
+	return ctrlGroupMatchEmpty(g)
+}
+
+// Portable implementation of matchEmpty.
+//
+// Note: On AMD64, this is an intrinsic implemented with SIMD instructions. See
+// note on bitset about the packed instrinsified return value.
+func ctrlGroupMatchEmpty(g ctrlGroup) bitset {
+	// An empty slot is   1000 0000
+	// A deleted slot is  1111 1110
+	// A full slot is     0??? ????
+	//
+	// A slot is empty iff bit 7 is set and bit 1 is not. We could select any
+	// of the other bits here (e.g. v << 1 would also work).
+	v := uint64(g)
+	return bitset((v &^ (v << 6)) & bitsetMSB)
+}
+
+// matchEmptyOrDeleted returns the set of slots in the group that are empty or
+// deleted.
+func (g ctrlGroup) matchEmptyOrDeleted() bitset {
+	return ctrlGroupMatchEmptyOrDeleted(g)
+}
+
+// Portable implementation of matchEmptyOrDeleted.
+//
+// Note: On AMD64, this is an intrinsic implemented with SIMD instructions. See
+// note on bitset about the packed instrinsified return value.
+func ctrlGroupMatchEmptyOrDeleted(g ctrlGroup) bitset {
+	// An empty slot is  1000 0000
+	// A deleted slot is 1111 1110
+	// A full slot is    0??? ????
+	//
+	// A slot is empty or deleted iff bit 7 is set.
+	v := uint64(g)
+	return bitset(v & bitsetMSB)
+}
+
+// matchFull returns the set of slots in the group that are full.
+func (g ctrlGroup) matchFull() bitset {
+	return ctrlGroupMatchFull(g)
+}
+
+// Portable implementation of matchFull.
+//
+// Note: On AMD64, this is an intrinsic implemented with SIMD instructions. See
+// note on bitset about the packed instrinsified return value.
+func ctrlGroupMatchFull(g ctrlGroup) bitset {
+	// An empty slot is  1000 0000
+	// A deleted slot is 1111 1110
+	// A full slot is    0??? ????
+	//
+	// A slot is full iff bit 7 is unset.
+	v := uint64(g)
+	return bitset(^v & bitsetMSB)
+}
+
+// groupReference is a wrapper type representing a single slot group stored at
+// data.
+//
+// A group holds abi.SwissMapGroupSlots slots (key/elem pairs) plus their
+// control word.
+type groupReference struct {
+	// data points to the group, which is described by typ.Group and has
+	// layout:
+	//
+	// type group struct {
+	// 	ctrls ctrlGroup
+	// 	slots [abi.SwissMapGroupSlots]slot
+	// }
+	//
+	// type slot struct {
+	// 	key  typ.Key
+	// 	elem typ.Elem
+	// }
+	data unsafe.Pointer // data *typ.Group
+}
+
+const (
+	ctrlGroupsSize   = unsafe.Sizeof(ctrlGroup(0))
+	groupSlotsOffset = ctrlGroupsSize
+)
+
+// alignUp rounds n up to a multiple of a. a must be a power of 2.
+func alignUp(n, a uintptr) uintptr {
+	return (n + a - 1) &^ (a - 1)
+}
+
+// alignUpPow2 rounds n up to the next power of 2.
+//
+// Returns true if round up causes overflow.
+func alignUpPow2(n uint64) (uint64, bool) {
+	if n == 0 {
+		return 0, false
+	}
+	v := (uint64(1) << sys.Len64(n-1))
+	if v == 0 {
+		return 0, true
+	}
+	return v, false
+}
+
+// ctrls returns the group control word.
+func (g *groupReference) ctrls() *ctrlGroup {
+	return (*ctrlGroup)(g.data)
+}
+
+// key returns a pointer to the key at index i.
+func (g *groupReference) key(typ *abi.SwissMapType, i uintptr) unsafe.Pointer {
+	offset := groupSlotsOffset + i*typ.SlotSize
+
+	return unsafe.Pointer(uintptr(g.data) + offset)
+}
+
+// elem returns a pointer to the element at index i.
+func (g *groupReference) elem(typ *abi.SwissMapType, i uintptr) unsafe.Pointer {
+	offset := groupSlotsOffset + i*typ.SlotSize + typ.ElemOff
+
+	return unsafe.Pointer(uintptr(g.data) + offset)
+}
+
+// groupsReference is a wrapper type describing an array of groups stored at
+// data.
+type groupsReference struct {
+	// data points to an array of groups. See groupReference above for the
+	// definition of group.
+	data unsafe.Pointer // data *[length]typ.Group
+
+	// lengthMask is the number of groups in data minus one (note that
+	// length must be a power of two). This allows computing i%length
+	// quickly using bitwise AND.
+	lengthMask uint64
+}
+
+// newGroups allocates a new array of length groups.
+//
+// Length must be a power of two.
+func newGroups(typ *abi.SwissMapType, length uint64) groupsReference {
+	return groupsReference{
+		// TODO: make the length type the same throughout.
+		data:       newarray(typ.Group, int(length)),
+		lengthMask: length - 1,
+	}
+}
+
+// group returns the group at index i.
+func (g *groupsReference) group(typ *abi.SwissMapType, i uint64) groupReference {
+	// TODO(prattmic): Do something here about truncation on cast to
+	// uintptr on 32-bit systems?
+	offset := uintptr(i) * typ.GroupSize
+
+	return groupReference{
+		data: unsafe.Pointer(uintptr(g.data) + offset),
+	}
+}
diff --git a/src/internal/runtime/maps/map.go b/src/internal/runtime/maps/map.go
new file mode 100644
index 00000000..62463351
--- /dev/null
+++ b/src/internal/runtime/maps/map.go
@@ -0,0 +1,772 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package maps implements Go's builtin map type.
+package maps
+
+import (
+	"internal/abi"
+	"internal/goarch"
+	"internal/runtime/math"
+	"internal/runtime/sys"
+	"unsafe"
+)
+
+// This package contains the implementation of Go's builtin map type.
+//
+// The map design is based on Abseil's "Swiss Table" map design
+// (https://abseil.io/about/design/swisstables), with additional modifications
+// to cover Go's additional requirements, discussed below.
+//
+// Terminology:
+// - Slot: A storage location of a single key/element pair.
+// - Group: A group of abi.SwissMapGroupSlots (8) slots, plus a control word.
+// - Control word: An 8-byte word which denotes whether each slot is empty,
+//   deleted, or used. If a slot is used, its control byte also contains the
+//   lower 7 bits of the hash (H2).
+// - H1: Upper 57 bits of a hash.
+// - H2: Lower 7 bits of a hash.
+// - Table: A complete "Swiss Table" hash table. A table consists of one or
+//   more groups for storage plus metadata to handle operation and determining
+//   when to grow.
+// - Map: The top-level Map type consists of zero or more tables for storage.
+//   The upper bits of the hash select which table a key belongs to.
+// - Directory: Array of the tables used by the map.
+//
+// At its core, the table design is similar to a traditional open-addressed
+// hash table. Storage consists of an array of groups, which effectively means
+// an array of key/elem slots with some control words interspersed. Lookup uses
+// the hash to determine an initial group to check. If, due to collisions, this
+// group contains no match, the probe sequence selects the next group to check
+// (see below for more detail about the probe sequence).
+//
+// The key difference occurs within a group. In a standard open-addressed
+// linear probed hash table, we would check each slot one at a time to find a
+// match. A swiss table utilizes the extra control word to check all 8 slots in
+// parallel.
+//
+// Each byte in the control word corresponds to one of the slots in the group.
+// In each byte, 1 bit is used to indicate whether the slot is in use, or if it
+// is empty/deleted. The other 7 bits contain the lower 7 bits of the hash for
+// the key in that slot. See [ctrl] for the exact encoding.
+//
+// During lookup, we can use some clever bitwise manipulation to compare all 8
+// 7-bit hashes against the input hash in parallel (see [ctrlGroup.matchH2]).
+// That is, we effectively perform 8 steps of probing in a single operation.
+// With SIMD instructions, this could be extended to 16 slots with a 16-byte
+// control word.
+//
+// Since we only use 7 bits of the 64 bit hash, there is a 1 in 128 (~0.7%)
+// probability of false positive on each slot, but that's fine: we always need
+// double check each match with a standard key comparison regardless.
+//
+// Probing
+//
+// Probing is done using the upper 57 bits (H1) of the hash as an index into
+// the groups array. Probing walks through the groups using quadratic probing
+// until it finds a group with a match or a group with an empty slot. See
+// [probeSeq] for specifics about the probe sequence. Note the probe
+// invariants: the number of groups must be a power of two, and the end of a
+// probe sequence must be a group with an empty slot (the table can never be
+// 100% full).
+//
+// Deletion
+//
+// Probing stops when it finds a group with an empty slot. This affects
+// deletion: when deleting from a completely full group, we must not mark the
+// slot as empty, as there could be more slots used later in a probe sequence
+// and this deletion would cause probing to stop too early. Instead, we mark
+// such slots as "deleted" with a tombstone. If the group still has an empty
+// slot, we don't need a tombstone and directly mark the slot empty. Insert
+// prioritizes reuse of tombstones over filling an empty slots. Otherwise,
+// tombstones are only completely cleared during grow, as an in-place cleanup
+// complicates iteration.
+//
+// Growth
+//
+// The probe sequence depends on the number of groups. Thus, when growing the
+// group count all slots must be reordered to match the new probe sequence. In
+// other words, an entire table must be grown at once.
+//
+// In order to support incremental growth, the map splits its contents across
+// multiple tables. Each table is still a full hash table, but an individual
+// table may only service a subset of the hash space. Growth occurs on
+// individual tables, so while an entire table must grow at once, each of these
+// grows is only a small portion of a map. The maximum size of a single grow is
+// limited by limiting the maximum size of a table before it is split into
+// multiple tables.
+//
+// A map starts with a single table. Up to [maxTableCapacity], growth simply
+// replaces this table with a replacement with double capacity. Beyond this
+// limit, growth splits the table into two.
+//
+// The map uses "extendible hashing" to select which table to use. In
+// extendible hashing, we use the upper bits of the hash as an index into an
+// array of tables (called the "directory"). The number of bits uses increases
+// as the number of tables increases. For example, when there is only 1 table,
+// we use 0 bits (no selection necessary). When there are 2 tables, we use 1
+// bit to select either the 0th or 1st table. [Map.globalDepth] is the number
+// of bits currently used for table selection, and by extension (1 <<
+// globalDepth), the size of the directory.
+//
+// Note that each table has its own load factor and grows independently. If the
+// 1st bucket grows, it will split. We'll need 2 bits to select tables, though
+// we'll have 3 tables total rather than 4. We support this by allowing
+// multiple indicies to point to the same table. This example:
+//
+//	directory (globalDepth=2)
+//	+----+
+//	| 00 | --\
+//	+----+    +--> table (localDepth=1)
+//	| 01 | --/
+//	+----+
+//	| 10 | ------> table (localDepth=2)
+//	+----+
+//	| 11 | ------> table (localDepth=2)
+//	+----+
+//
+// Tables track the depth they were created at (localDepth). It is necessary to
+// grow the directory when splitting a table where globalDepth == localDepth.
+//
+// Iteration
+//
+// Iteration is the most complex part of the map due to Go's generous iteration
+// semantics. A summary of semantics from the spec:
+// 1. Adding and/or deleting entries during iteration MUST NOT cause iteration
+//    to return the same entry more than once.
+// 2. Entries added during iteration MAY be returned by iteration.
+// 3. Entries modified during iteration MUST return their latest value.
+// 4. Entries deleted during iteration MUST NOT be returned by iteration.
+// 5. Iteration order is unspecified. In the implementation, it is explicitly
+//    randomized.
+//
+// If the map never grows, these semantics are straightforward: just iterate
+// over every table in the directory and every group and slot in each table.
+// These semantics all land as expected.
+//
+// If the map grows during iteration, things complicate significantly. First
+// and foremost, we need to track which entries we already returned to satisfy
+// (1). There are three types of grow:
+// a. A table replaced by a single larger table.
+// b. A table split into two replacement tables.
+// c. Growing the directory (occurs as part of (b) if necessary).
+//
+// For all of these cases, the replacement table(s) will have a different probe
+// sequence, so simply tracking the current group and slot indices is not
+// sufficient.
+//
+// For (a) and (b), note that grows of tables other than the one we are
+// currently iterating over are irrelevant.
+//
+// We handle (a) and (b) by having the iterator keep a reference to the table
+// it is currently iterating over, even after the table is replaced. We keep
+// iterating over the original table to maintain the iteration order and avoid
+// violating (1). Any new entries added only to the replacement table(s) will
+// be skipped (allowed by (2)). To avoid violating (3) or (4), while we use the
+// original table to select the keys, we must look them up again in the new
+// table(s) to determine if they have been modified or deleted. There is yet
+// another layer of complexity if the key does not compare equal itself. See
+// [Iter.Next] for the gory details.
+//
+// Note that for (b) once we finish iterating over the old table we'll need to
+// skip the next entry in the directory, as that contains the second split of
+// the old table. We can use the old table's localDepth to determine the next
+// logical index to use.
+//
+// For (b), we must adjust the current directory index when the directory
+// grows. This is more straightforward, as the directory orders remains the
+// same after grow, so we just double the index if the directory size doubles.
+
+// Extracts the H1 portion of a hash: the 57 upper bits.
+// TODO(prattmic): what about 32-bit systems?
+func h1(h uintptr) uintptr {
+	return h >> 7
+}
+
+// Extracts the H2 portion of a hash: the 7 bits not used for h1.
+//
+// These are used as an occupied control byte.
+func h2(h uintptr) uintptr {
+	return h & 0x7f
+}
+
+type Map struct {
+	// The number of filled slots (i.e. the number of elements in all
+	// tables). Excludes deleted slots.
+	// Must be first (known by the compiler, for len() builtin).
+	used uint64
+
+	// seed is the hash seed, computed as a unique random number per map.
+	seed uintptr
+
+	// The directory of tables.
+	//
+	// Normally dirPtr points to an array of table pointers
+	//
+	// dirPtr *[dirLen]*table
+	//
+	// The length (dirLen) of this array is `1 << globalDepth`. Multiple
+	// entries may point to the same table. See top-level comment for more
+	// details.
+	//
+	// Small map optimization: if the map always contained
+	// abi.SwissMapGroupSlots or fewer entries, it fits entirely in a
+	// single group. In that case dirPtr points directly to a single group.
+	//
+	// dirPtr *group
+	//
+	// In this case, dirLen is 0. used counts the number of used slots in
+	// the group. Note that small maps never have deleted slots (as there
+	// is no probe sequence to maintain).
+	dirPtr unsafe.Pointer
+	dirLen int
+
+	// The number of bits to use in table directory lookups.
+	globalDepth uint8
+
+	// The number of bits to shift out of the hash for directory lookups.
+	// On 64-bit systems, this is 64 - globalDepth.
+	globalShift uint8
+
+	// writing is a flag that is toggled (XOR 1) while the map is being
+	// written. Normally it is set to 1 when writing, but if there are
+	// multiple concurrent writers, then toggling increases the probability
+	// that both sides will detect the race.
+	writing uint8
+
+	// clearSeq is a sequence counter of calls to Clear. It is used to
+	// detect map clears during iteration.
+	clearSeq uint64
+}
+
+func depthToShift(depth uint8) uint8 {
+	if goarch.PtrSize == 4 {
+		return 32 - depth
+	}
+	return 64 - depth
+}
+
+// If m is non-nil, it should be used rather than allocating.
+//
+// maxAlloc should be runtime.maxAlloc.
+//
+// TODO(prattmic): Put maxAlloc somewhere accessible.
+func NewMap(mt *abi.SwissMapType, hint uintptr, m *Map, maxAlloc uintptr) *Map {
+	if m == nil {
+		m = new(Map)
+	}
+
+	m.seed = uintptr(rand())
+
+	if hint <= abi.SwissMapGroupSlots {
+		// A small map can fill all 8 slots, so no need to increase
+		// target capacity.
+		//
+		// In fact, since an 8 slot group is what the first assignment
+		// to an empty map would allocate anyway, it doesn't matter if
+		// we allocate here or on the first assignment.
+		//
+		// Thus we just return without allocating. (We'll save the
+		// allocation completely if no assignment comes.)
+
+		// Note that the compiler may have initialized m.dirPtr with a
+		// pointer to a stack-allocated group, in which case we already
+		// have a group. The control word is already initialized.
+
+		return m
+	}
+
+	// Full size map.
+
+	// Set initial capacity to hold hint entries without growing in the
+	// average case.
+	targetCapacity := (hint * abi.SwissMapGroupSlots) / maxAvgGroupLoad
+	if targetCapacity < hint { // overflow
+		return m // return an empty map.
+	}
+
+	dirSize := (uint64(targetCapacity) + maxTableCapacity - 1) / maxTableCapacity
+	dirSize, overflow := alignUpPow2(dirSize)
+	if overflow || dirSize > uint64(math.MaxUintptr) {
+		return m // return an empty map.
+	}
+
+	// Reject hints that are obviously too large.
+	groups, overflow := math.MulUintptr(uintptr(dirSize), maxTableCapacity)
+	if overflow {
+		return m // return an empty map.
+	} else {
+		mem, overflow := math.MulUintptr(groups, mt.GroupSize)
+		if overflow || mem > maxAlloc {
+			return m // return an empty map.
+		}
+	}
+
+	m.globalDepth = uint8(sys.TrailingZeros64(dirSize))
+	m.globalShift = depthToShift(m.globalDepth)
+
+	directory := make([]*table, dirSize)
+
+	for i := range directory {
+		// TODO: Think more about initial table capacity.
+		directory[i] = newTable(mt, uint64(targetCapacity)/dirSize, i, m.globalDepth)
+	}
+
+	m.dirPtr = unsafe.Pointer(&directory[0])
+	m.dirLen = len(directory)
+
+	return m
+}
+
+func NewEmptyMap() *Map {
+	m := new(Map)
+	m.seed = uintptr(rand())
+	// See comment in NewMap. No need to eager allocate a group.
+	return m
+}
+
+func (m *Map) directoryIndex(hash uintptr) uintptr {
+	if m.dirLen == 1 {
+		return 0
+	}
+	return hash >> (m.globalShift & 63)
+}
+
+func (m *Map) directoryAt(i uintptr) *table {
+	return *(**table)(unsafe.Pointer(uintptr(m.dirPtr) + goarch.PtrSize*i))
+}
+
+func (m *Map) directorySet(i uintptr, nt *table) {
+	*(**table)(unsafe.Pointer(uintptr(m.dirPtr) + goarch.PtrSize*i)) = nt
+}
+
+func (m *Map) replaceTable(nt *table) {
+	// The number of entries that reference the same table doubles for each
+	// time the globalDepth grows without the table splitting.
+	entries := 1 << (m.globalDepth - nt.localDepth)
+	for i := 0; i < entries; i++ {
+		//m.directory[nt.index+i] = nt
+		m.directorySet(uintptr(nt.index+i), nt)
+	}
+}
+
+func (m *Map) installTableSplit(old, left, right *table) {
+	if old.localDepth == m.globalDepth {
+		// No room for another level in the directory. Grow the
+		// directory.
+		newDir := make([]*table, m.dirLen*2)
+		for i := range m.dirLen {
+			t := m.directoryAt(uintptr(i))
+			newDir[2*i] = t
+			newDir[2*i+1] = t
+			// t may already exist in multiple indicies. We should
+			// only update t.index once. Since the index must
+			// increase, seeing the original index means this must
+			// be the first time we've encountered this table.
+			if t.index == i {
+				t.index = 2 * i
+			}
+		}
+		m.globalDepth++
+		m.globalShift--
+		//m.directory = newDir
+		m.dirPtr = unsafe.Pointer(&newDir[0])
+		m.dirLen = len(newDir)
+	}
+
+	// N.B. left and right may still consume multiple indicies if the
+	// directory has grown multiple times since old was last split.
+	left.index = old.index
+	m.replaceTable(left)
+
+	entries := 1 << (m.globalDepth - left.localDepth)
+	right.index = left.index + entries
+	m.replaceTable(right)
+}
+
+func (m *Map) Used() uint64 {
+	return m.used
+}
+
+// Get performs a lookup of the key that key points to. It returns a pointer to
+// the element, or false if the key doesn't exist.
+func (m *Map) Get(typ *abi.SwissMapType, key unsafe.Pointer) (unsafe.Pointer, bool) {
+	return m.getWithoutKey(typ, key)
+}
+
+func (m *Map) getWithKey(typ *abi.SwissMapType, key unsafe.Pointer) (unsafe.Pointer, unsafe.Pointer, bool) {
+	if m.Used() == 0 {
+		return nil, nil, false
+	}
+
+	if m.writing != 0 {
+		fatal("concurrent map read and map write")
+	}
+
+	hash := typ.Hasher(key, m.seed)
+
+	if m.dirLen == 0 {
+		return m.getWithKeySmall(typ, hash, key)
+	}
+
+	idx := m.directoryIndex(hash)
+	return m.directoryAt(idx).getWithKey(typ, hash, key)
+}
+
+func (m *Map) getWithoutKey(typ *abi.SwissMapType, key unsafe.Pointer) (unsafe.Pointer, bool) {
+	if m.Used() == 0 {
+		return nil, false
+	}
+
+	if m.writing != 0 {
+		fatal("concurrent map read and map write")
+	}
+
+	hash := typ.Hasher(key, m.seed)
+
+	if m.dirLen == 0 {
+		_, elem, ok := m.getWithKeySmall(typ, hash, key)
+		return elem, ok
+	}
+
+	idx := m.directoryIndex(hash)
+	return m.directoryAt(idx).getWithoutKey(typ, hash, key)
+}
+
+func (m *Map) getWithKeySmall(typ *abi.SwissMapType, hash uintptr, key unsafe.Pointer) (unsafe.Pointer, unsafe.Pointer, bool) {
+	g := groupReference{
+		data: m.dirPtr,
+	}
+
+	h2 := uint8(h2(hash))
+	ctrls := *g.ctrls()
+
+	for i := uintptr(0); i < abi.SwissMapGroupSlots; i++ {
+		c := uint8(ctrls)
+		ctrls >>= 8
+		if c != h2 {
+			continue
+		}
+
+		slotKey := g.key(typ, i)
+		if typ.IndirectKey() {
+			slotKey = *((*unsafe.Pointer)(slotKey))
+		}
+
+		if typ.Key.Equal(key, slotKey) {
+			slotElem := g.elem(typ, i)
+			if typ.IndirectElem() {
+				slotElem = *((*unsafe.Pointer)(slotElem))
+			}
+			return slotKey, slotElem, true
+		}
+	}
+
+	return nil, nil, false
+}
+
+func (m *Map) Put(typ *abi.SwissMapType, key, elem unsafe.Pointer) {
+	slotElem := m.PutSlot(typ, key)
+	typedmemmove(typ.Elem, slotElem, elem)
+}
+
+// PutSlot returns a pointer to the element slot where an inserted element
+// should be written.
+//
+// PutSlot never returns nil.
+func (m *Map) PutSlot(typ *abi.SwissMapType, key unsafe.Pointer) unsafe.Pointer {
+	if m.writing != 0 {
+		fatal("concurrent map writes")
+	}
+
+	hash := typ.Hasher(key, m.seed)
+
+	// Set writing after calling Hasher, since Hasher may panic, in which
+	// case we have not actually done a write.
+	m.writing ^= 1 // toggle, see comment on writing
+
+	if m.dirPtr == nil {
+		m.growToSmall(typ)
+	}
+
+	if m.dirLen == 0 {
+		if m.used < abi.SwissMapGroupSlots {
+			elem := m.putSlotSmall(typ, hash, key)
+
+			if m.writing == 0 {
+				fatal("concurrent map writes")
+			}
+			m.writing ^= 1
+
+			return elem
+		}
+
+		// Can't fit another entry, grow to full size map.
+		//
+		// TODO(prattmic): If this is an update to an existing key then
+		// we actually don't need to grow.
+		m.growToTable(typ)
+	}
+
+	for {
+		idx := m.directoryIndex(hash)
+		elem, ok := m.directoryAt(idx).PutSlot(typ, m, hash, key)
+		if !ok {
+			continue
+		}
+
+		if m.writing == 0 {
+			fatal("concurrent map writes")
+		}
+		m.writing ^= 1
+
+		return elem
+	}
+}
+
+func (m *Map) putSlotSmall(typ *abi.SwissMapType, hash uintptr, key unsafe.Pointer) unsafe.Pointer {
+	g := groupReference{
+		data: m.dirPtr,
+	}
+
+	match := g.ctrls().matchH2(h2(hash))
+
+	// Look for an existing slot containing this key.
+	for match != 0 {
+		i := match.first()
+
+		slotKey := g.key(typ, i)
+		if typ.IndirectKey() {
+			slotKey = *((*unsafe.Pointer)(slotKey))
+		}
+		if typ.Key.Equal(key, slotKey) {
+			if typ.NeedKeyUpdate() {
+				typedmemmove(typ.Key, slotKey, key)
+			}
+
+			slotElem := g.elem(typ, i)
+			if typ.IndirectElem() {
+				slotElem = *((*unsafe.Pointer)(slotElem))
+			}
+
+			return slotElem
+		}
+		match = match.removeFirst()
+	}
+
+	// There can't be deleted slots, small maps can't have them
+	// (see deleteSmall). Use matchEmptyOrDeleted as it is a bit
+	// more efficient than matchEmpty.
+	match = g.ctrls().matchEmptyOrDeleted()
+	if match == 0 {
+		fatal("small map with no empty slot (concurrent map writes?)")
+		return nil
+	}
+
+	i := match.first()
+
+	slotKey := g.key(typ, i)
+	if typ.IndirectKey() {
+		kmem := newobject(typ.Key)
+		*(*unsafe.Pointer)(slotKey) = kmem
+		slotKey = kmem
+	}
+	typedmemmove(typ.Key, slotKey, key)
+
+	slotElem := g.elem(typ, i)
+	if typ.IndirectElem() {
+		emem := newobject(typ.Elem)
+		*(*unsafe.Pointer)(slotElem) = emem
+		slotElem = emem
+	}
+
+	g.ctrls().set(i, ctrl(h2(hash)))
+	m.used++
+
+	return slotElem
+}
+
+func (m *Map) growToSmall(typ *abi.SwissMapType) {
+	grp := newGroups(typ, 1)
+	m.dirPtr = grp.data
+
+	g := groupReference{
+		data: m.dirPtr,
+	}
+	g.ctrls().setEmpty()
+}
+
+func (m *Map) growToTable(typ *abi.SwissMapType) {
+	tab := newTable(typ, 2*abi.SwissMapGroupSlots, 0, 0)
+
+	g := groupReference{
+		data: m.dirPtr,
+	}
+
+	for i := uintptr(0); i < abi.SwissMapGroupSlots; i++ {
+		if (g.ctrls().get(i) & ctrlEmpty) == ctrlEmpty {
+			// Empty
+			continue
+		}
+
+		key := g.key(typ, i)
+		if typ.IndirectKey() {
+			key = *((*unsafe.Pointer)(key))
+		}
+
+		elem := g.elem(typ, i)
+		if typ.IndirectElem() {
+			elem = *((*unsafe.Pointer)(elem))
+		}
+
+		hash := typ.Hasher(key, m.seed)
+
+		tab.uncheckedPutSlot(typ, hash, key, elem)
+	}
+
+	directory := make([]*table, 1)
+
+	directory[0] = tab
+
+	m.dirPtr = unsafe.Pointer(&directory[0])
+	m.dirLen = len(directory)
+
+	m.globalDepth = 0
+	m.globalShift = depthToShift(m.globalDepth)
+}
+
+func (m *Map) Delete(typ *abi.SwissMapType, key unsafe.Pointer) {
+	if m == nil || m.Used() == 0 {
+		if err := mapKeyError(typ, key); err != nil {
+			panic(err) // see issue 23734
+		}
+		return
+	}
+
+	if m.writing != 0 {
+		fatal("concurrent map writes")
+	}
+
+	hash := typ.Hasher(key, m.seed)
+
+	// Set writing after calling Hasher, since Hasher may panic, in which
+	// case we have not actually done a write.
+	m.writing ^= 1 // toggle, see comment on writing
+
+	if m.dirLen == 0 {
+		m.deleteSmall(typ, hash, key)
+	} else {
+		idx := m.directoryIndex(hash)
+		m.directoryAt(idx).Delete(typ, m, hash, key)
+	}
+
+	if m.used == 0 {
+		// Reset the hash seed to make it more difficult for attackers
+		// to repeatedly trigger hash collisions. See
+		// https://go.dev/issue/25237.
+		m.seed = uintptr(rand())
+	}
+
+	if m.writing == 0 {
+		fatal("concurrent map writes")
+	}
+	m.writing ^= 1
+}
+
+func (m *Map) deleteSmall(typ *abi.SwissMapType, hash uintptr, key unsafe.Pointer) {
+	g := groupReference{
+		data: m.dirPtr,
+	}
+
+	match := g.ctrls().matchH2(h2(hash))
+
+	for match != 0 {
+		i := match.first()
+		slotKey := g.key(typ, i)
+		origSlotKey := slotKey
+		if typ.IndirectKey() {
+			slotKey = *((*unsafe.Pointer)(slotKey))
+		}
+		if typ.Key.Equal(key, slotKey) {
+			m.used--
+
+			if typ.IndirectKey() {
+				// Clearing the pointer is sufficient.
+				*(*unsafe.Pointer)(origSlotKey) = nil
+			} else if typ.Key.Pointers() {
+				// Only bother clearing if there are pointers.
+				typedmemclr(typ.Key, slotKey)
+			}
+
+			slotElem := g.elem(typ, i)
+			if typ.IndirectElem() {
+				// Clearing the pointer is sufficient.
+				*(*unsafe.Pointer)(slotElem) = nil
+			} else {
+				// Unlike keys, always clear the elem (even if
+				// it contains no pointers), as compound
+				// assignment operations depend on cleared
+				// deleted values. See
+				// https://go.dev/issue/25936.
+				typedmemclr(typ.Elem, slotElem)
+			}
+
+			// We only have 1 group, so it is OK to immediately
+			// reuse deleted slots.
+			g.ctrls().set(i, ctrlEmpty)
+			return
+		}
+		match = match.removeFirst()
+	}
+}
+
+// Clear deletes all entries from the map resulting in an empty map.
+func (m *Map) Clear(typ *abi.SwissMapType) {
+	if m == nil || m.Used() == 0 {
+		return
+	}
+
+	if m.writing != 0 {
+		fatal("concurrent map writes")
+	}
+	m.writing ^= 1 // toggle, see comment on writing
+
+	if m.dirLen == 0 {
+		m.clearSmall(typ)
+	} else {
+		var lastTab *table
+		for i := range m.dirLen {
+			t := m.directoryAt(uintptr(i))
+			if t == lastTab {
+				continue
+			}
+			t.Clear(typ)
+			lastTab = t
+		}
+		m.used = 0
+		m.clearSeq++
+		// TODO: shrink directory?
+	}
+
+	// Reset the hash seed to make it more difficult for attackers to
+	// repeatedly trigger hash collisions. See https://go.dev/issue/25237.
+	m.seed = uintptr(rand())
+
+	if m.writing == 0 {
+		fatal("concurrent map writes")
+	}
+	m.writing ^= 1
+}
+
+func (m *Map) clearSmall(typ *abi.SwissMapType) {
+	g := groupReference{
+		data: m.dirPtr,
+	}
+
+	typedmemclr(typ.Group, g.data)
+	g.ctrls().setEmpty()
+
+	m.used = 0
+	m.clearSeq++
+}
diff --git a/src/internal/runtime/maps/map_swiss_test.go b/src/internal/runtime/maps/map_swiss_test.go
new file mode 100644
index 00000000..6da00641
--- /dev/null
+++ b/src/internal/runtime/maps/map_swiss_test.go
@@ -0,0 +1,212 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Tests of map internals that need to use the builtin map type, and thus must
+// be built with GOEXPERIMENT=swissmap.
+
+//go:build goexperiment.swissmap
+
+package maps_test
+
+import (
+	"fmt"
+	"internal/abi"
+	"internal/runtime/maps"
+	"testing"
+	"unsafe"
+)
+
+var alwaysFalse bool
+var escapeSink any
+
+func escape[T any](x T) T {
+	if alwaysFalse {
+		escapeSink = x
+	}
+	return x
+}
+
+const (
+	belowMax = abi.SwissMapGroupSlots * 3 / 2                                               // 1.5 * group max = 2 groups @ 75%
+	atMax    = (2 * abi.SwissMapGroupSlots * maps.MaxAvgGroupLoad) / abi.SwissMapGroupSlots // 2 groups at 7/8 full.
+)
+
+func TestTableGroupCount(t *testing.T) {
+	// Test that maps of different sizes have the right number of
+	// tables/groups.
+
+	type mapCount struct {
+		tables int
+		groups uint64
+	}
+
+	type mapCase struct {
+		initialLit  mapCount
+		initialHint mapCount
+		after       mapCount
+	}
+
+	var testCases = []struct {
+		n      int     // n is the number of map elements
+		escape mapCase // expected values for escaping map
+	}{
+		{
+			n: -(1 << 30),
+			escape: mapCase{
+				initialLit:  mapCount{0, 0},
+				initialHint: mapCount{0, 0},
+				after:       mapCount{0, 0},
+			},
+		},
+		{
+			n: -1,
+			escape: mapCase{
+				initialLit:  mapCount{0, 0},
+				initialHint: mapCount{0, 0},
+				after:       mapCount{0, 0},
+			},
+		},
+		{
+			n: 0,
+			escape: mapCase{
+				initialLit:  mapCount{0, 0},
+				initialHint: mapCount{0, 0},
+				after:       mapCount{0, 0},
+			},
+		},
+		{
+			n: 1,
+			escape: mapCase{
+				initialLit:  mapCount{0, 0},
+				initialHint: mapCount{0, 0},
+				after:       mapCount{0, 1},
+			},
+		},
+		{
+			n: abi.SwissMapGroupSlots,
+			escape: mapCase{
+				initialLit:  mapCount{0, 0},
+				initialHint: mapCount{0, 0},
+				after:       mapCount{0, 1},
+			},
+		},
+		{
+			n: abi.SwissMapGroupSlots + 1,
+			escape: mapCase{
+				initialLit:  mapCount{0, 0},
+				initialHint: mapCount{1, 2},
+				after:       mapCount{1, 2},
+			},
+		},
+		{
+			n: belowMax, // 1.5 group max = 2 groups @ 75%
+			escape: mapCase{
+				initialLit:  mapCount{0, 0},
+				initialHint: mapCount{1, 2},
+				after:       mapCount{1, 2},
+			},
+		},
+		{
+			n: atMax, // 2 groups at max
+			escape: mapCase{
+				initialLit:  mapCount{0, 0},
+				initialHint: mapCount{1, 2},
+				after:       mapCount{1, 2},
+			},
+		},
+		{
+			n: atMax + 1, // 2 groups at max + 1 -> grow to 4 groups
+			escape: mapCase{
+				initialLit:  mapCount{0, 0},
+				initialHint: mapCount{1, 4},
+				after:       mapCount{1, 4},
+			},
+		},
+		{
+			n: 2 * belowMax, // 3 * group max = 4 groups @75%
+			escape: mapCase{
+				initialLit:  mapCount{0, 0},
+				initialHint: mapCount{1, 4},
+				after:       mapCount{1, 4},
+			},
+		},
+		{
+			n: 2*atMax + 1, // 4 groups at max + 1 -> grow to 8 groups
+			escape: mapCase{
+				initialLit:  mapCount{0, 0},
+				initialHint: mapCount{1, 8},
+				after:       mapCount{1, 8},
+			},
+		},
+	}
+
+	testMap := func(t *testing.T, m map[int]int, n int, initial, after mapCount) {
+		mm := *(**maps.Map)(unsafe.Pointer(&m))
+
+		gotTab := mm.TableCount()
+		if gotTab != initial.tables {
+			t.Errorf("initial TableCount got %d want %d", gotTab, initial.tables)
+		}
+
+		gotGroup := mm.GroupCount()
+		if gotGroup != initial.groups {
+			t.Errorf("initial GroupCount got %d want %d", gotGroup, initial.groups)
+		}
+
+		for i := 0; i < n; i++ {
+			m[i] = i
+		}
+
+		gotTab = mm.TableCount()
+		if gotTab != after.tables {
+			t.Errorf("after TableCount got %d want %d", gotTab, after.tables)
+		}
+
+		gotGroup = mm.GroupCount()
+		if gotGroup != after.groups {
+			t.Errorf("after GroupCount got %d want %d", gotGroup, after.groups)
+		}
+	}
+
+	t.Run("mapliteral", func(t *testing.T) {
+		for _, tc := range testCases {
+			t.Run(fmt.Sprintf("n=%d", tc.n), func(t *testing.T) {
+				t.Run("escape", func(t *testing.T) {
+					m := escape(map[int]int{})
+					testMap(t, m, tc.n, tc.escape.initialLit, tc.escape.after)
+				})
+			})
+		}
+	})
+	t.Run("nohint", func(t *testing.T) {
+		for _, tc := range testCases {
+			t.Run(fmt.Sprintf("n=%d", tc.n), func(t *testing.T) {
+				t.Run("escape", func(t *testing.T) {
+					m := escape(make(map[int]int))
+					testMap(t, m, tc.n, tc.escape.initialLit, tc.escape.after)
+				})
+			})
+		}
+	})
+	t.Run("makemap", func(t *testing.T) {
+		for _, tc := range testCases {
+			t.Run(fmt.Sprintf("n=%d", tc.n), func(t *testing.T) {
+				t.Run("escape", func(t *testing.T) {
+					m := escape(make(map[int]int, tc.n))
+					testMap(t, m, tc.n, tc.escape.initialHint, tc.escape.after)
+				})
+			})
+		}
+	})
+	t.Run("makemap64", func(t *testing.T) {
+		for _, tc := range testCases {
+			t.Run(fmt.Sprintf("n=%d", tc.n), func(t *testing.T) {
+				t.Run("escape", func(t *testing.T) {
+					m := escape(make(map[int]int, int64(tc.n)))
+					testMap(t, m, tc.n, tc.escape.initialHint, tc.escape.after)
+				})
+			})
+		}
+	})
+}
diff --git a/src/internal/runtime/maps/map_test.go b/src/internal/runtime/maps/map_test.go
new file mode 100644
index 00000000..160450eb
--- /dev/null
+++ b/src/internal/runtime/maps/map_test.go
@@ -0,0 +1,701 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package maps_test
+
+import (
+	"fmt"
+	"internal/abi"
+	"internal/runtime/maps"
+	"math"
+	"testing"
+	"unsafe"
+)
+
+func TestCtrlSize(t *testing.T) {
+	cs := unsafe.Sizeof(maps.CtrlGroup(0))
+	if cs != abi.SwissMapGroupSlots {
+		t.Errorf("ctrlGroup size got %d want abi.SwissMapGroupSlots %d", cs, abi.SwissMapGroupSlots)
+	}
+}
+
+func TestMapPut(t *testing.T) {
+	m, typ := maps.NewTestMap[uint32, uint64](8)
+
+	key := uint32(0)
+	elem := uint64(256 + 0)
+
+	for i := 0; i < 31; i++ {
+		key += 1
+		elem += 1
+		m.Put(typ, unsafe.Pointer(&key), unsafe.Pointer(&elem))
+
+		if maps.DebugLog {
+			fmt.Printf("After put %d: %v\n", key, m)
+		}
+	}
+
+	if m.Used() != 31 {
+		t.Errorf("Used() used got %d want 31", m.Used())
+	}
+
+	key = uint32(0)
+	elem = uint64(256 + 0)
+
+	for i := 0; i < 31; i++ {
+		key += 1
+		elem += 1
+		got, ok := m.Get(typ, unsafe.Pointer(&key))
+		if !ok {
+			t.Errorf("Get(%d) got ok false want true", key)
+		}
+		gotElem := *(*uint64)(got)
+		if gotElem != elem {
+			t.Errorf("Get(%d) got elem %d want %d", key, gotElem, elem)
+		}
+	}
+}
+
+// Grow enough to cause a table split.
+func TestMapSplit(t *testing.T) {
+	m, typ := maps.NewTestMap[uint32, uint64](0)
+
+	key := uint32(0)
+	elem := uint64(256 + 0)
+
+	for i := 0; i < 2*maps.MaxTableCapacity; i++ {
+		key += 1
+		elem += 1
+		m.Put(typ, unsafe.Pointer(&key), unsafe.Pointer(&elem))
+
+		if maps.DebugLog {
+			fmt.Printf("After put %d: %v\n", key, m)
+		}
+	}
+
+	if m.Used() != 2*maps.MaxTableCapacity {
+		t.Errorf("Used() used got %d want 31", m.Used())
+	}
+
+	key = uint32(0)
+	elem = uint64(256 + 0)
+
+	for i := 0; i < 2*maps.MaxTableCapacity; i++ {
+		key += 1
+		elem += 1
+		got, ok := m.Get(typ, unsafe.Pointer(&key))
+		if !ok {
+			t.Errorf("Get(%d) got ok false want true", key)
+		}
+		gotElem := *(*uint64)(got)
+		if gotElem != elem {
+			t.Errorf("Get(%d) got elem %d want %d", key, gotElem, elem)
+		}
+	}
+}
+
+func TestMapDelete(t *testing.T) {
+	m, typ := maps.NewTestMap[uint32, uint64](32)
+
+	key := uint32(0)
+	elem := uint64(256 + 0)
+
+	for i := 0; i < 31; i++ {
+		key += 1
+		elem += 1
+		m.Put(typ, unsafe.Pointer(&key), unsafe.Pointer(&elem))
+
+		if maps.DebugLog {
+			fmt.Printf("After put %d: %v\n", key, m)
+		}
+	}
+
+	key = uint32(0)
+	elem = uint64(256 + 0)
+
+	for i := 0; i < 31; i++ {
+		key += 1
+		m.Delete(typ, unsafe.Pointer(&key))
+	}
+
+	if m.Used() != 0 {
+		t.Errorf("Used() used got %d want 0", m.Used())
+	}
+
+	key = uint32(0)
+	elem = uint64(256 + 0)
+
+	for i := 0; i < 31; i++ {
+		key += 1
+		elem += 1
+		_, ok := m.Get(typ, unsafe.Pointer(&key))
+		if ok {
+			t.Errorf("Get(%d) got ok true want false", key)
+		}
+	}
+}
+
+func TestTableClear(t *testing.T) {
+	m, typ := maps.NewTestMap[uint32, uint64](32)
+
+	key := uint32(0)
+	elem := uint64(256 + 0)
+
+	for i := 0; i < 31; i++ {
+		key += 1
+		elem += 1
+		m.Put(typ, unsafe.Pointer(&key), unsafe.Pointer(&elem))
+
+		if maps.DebugLog {
+			fmt.Printf("After put %d: %v\n", key, m)
+		}
+	}
+
+	m.Clear(typ)
+
+	if m.Used() != 0 {
+		t.Errorf("Clear() used got %d want 0", m.Used())
+	}
+
+	key = uint32(0)
+	elem = uint64(256 + 0)
+
+	for i := 0; i < 31; i++ {
+		key += 1
+		elem += 1
+		_, ok := m.Get(typ, unsafe.Pointer(&key))
+		if ok {
+			t.Errorf("Get(%d) got ok true want false", key)
+		}
+	}
+}
+
+// +0.0 and -0.0 compare equal, but we must still must update the key slot when
+// overwriting.
+func TestTableKeyUpdate(t *testing.T) {
+	m, typ := maps.NewTestMap[float64, uint64](8)
+
+	zero := float64(0.0)
+	negZero := math.Copysign(zero, -1.0)
+	elem := uint64(0)
+
+	m.Put(typ, unsafe.Pointer(&zero), unsafe.Pointer(&elem))
+	if maps.DebugLog {
+		fmt.Printf("After put %f: %v\n", zero, m)
+	}
+
+	elem = 1
+	m.Put(typ, unsafe.Pointer(&negZero), unsafe.Pointer(&elem))
+	if maps.DebugLog {
+		fmt.Printf("After put %f: %v\n", negZero, m)
+	}
+
+	if m.Used() != 1 {
+		t.Errorf("Used() used got %d want 1", m.Used())
+	}
+
+	it := new(maps.Iter)
+	it.Init(typ, m)
+	it.Next()
+	keyPtr, elemPtr := it.Key(), it.Elem()
+	if keyPtr == nil {
+		t.Fatal("it.Key() got nil want key")
+	}
+
+	key := *(*float64)(keyPtr)
+	elem = *(*uint64)(elemPtr)
+	if math.Copysign(1.0, key) > 0 {
+		t.Errorf("map key %f has positive sign", key)
+	}
+	if elem != 1 {
+		t.Errorf("map elem got %d want 1", elem)
+	}
+}
+
+// Put should reuse a deleted slot rather than consuming an empty slot.
+func TestTablePutDelete(t *testing.T) {
+	// Put will reuse the first deleted slot it encounters.
+	//
+	// This is awkward to test because Delete will only install ctrlDeleted
+	// if the group is full, otherwise it goes straight to empty.
+	//
+	// So first we must add to the table continuously until we happen to
+	// fill a group.
+
+	// Avoid small maps, they have no tables.
+	m, typ := maps.NewTestMap[uint32, uint32](16)
+
+	key := uint32(0)
+	elem := uint32(256 + 0)
+
+	for {
+		key += 1
+		elem += 1
+
+		m.Put(typ, unsafe.Pointer(&key), unsafe.Pointer(&elem))
+
+		// Normally a Put that fills a group would fill it with the
+		// inserted key, so why search the whole map for a potentially
+		// different key in a full group?
+		//
+		// Put may grow/split a table. Initial construction of the new
+		// table(s) could result in a full group consisting of
+		// arbitrary keys.
+		fullKeyPtr := m.KeyFromFullGroup(typ)
+		if fullKeyPtr != nil {
+			// Found a full group.
+			key = *(*uint32)(fullKeyPtr)
+			elem = 256 + key
+			break
+		}
+	}
+
+	// Key is in a full group. Deleting it will result in a ctrlDeleted
+	// slot.
+	m.Delete(typ, unsafe.Pointer(&key))
+
+	// Re-insert key. This should reuse the deleted slot rather than
+	// consuming space.
+	tabWant := m.TableFor(typ, unsafe.Pointer(&key))
+	growthLeftWant := tabWant.GrowthLeft()
+
+	m.Put(typ, unsafe.Pointer(&key), unsafe.Pointer(&elem))
+
+	tabGot := m.TableFor(typ, unsafe.Pointer(&key))
+	growthLeftGot := tabGot.GrowthLeft()
+
+	if tabGot != tabWant {
+		// There shouldn't be a grow, as replacing a deleted slot
+		// doesn't require more space.
+		t.Errorf("Put(%d) grew table got %v want %v map %v", key, tabGot, tabWant, m)
+	}
+
+	if growthLeftGot != growthLeftWant {
+		t.Errorf("GrowthLeft got %d want %d: map %v tab %v", growthLeftGot, growthLeftWant, m, tabGot)
+	}
+}
+
+func TestTableIteration(t *testing.T) {
+	m, typ := maps.NewTestMap[uint32, uint64](8)
+
+	key := uint32(0)
+	elem := uint64(256 + 0)
+
+	for i := 0; i < 31; i++ {
+		key += 1
+		elem += 1
+		m.Put(typ, unsafe.Pointer(&key), unsafe.Pointer(&elem))
+
+		if maps.DebugLog {
+			fmt.Printf("After put %d: %v\n", key, m)
+		}
+	}
+
+	got := make(map[uint32]uint64)
+
+	it := new(maps.Iter)
+	it.Init(typ, m)
+	for {
+		it.Next()
+		keyPtr, elemPtr := it.Key(), it.Elem()
+		if keyPtr == nil {
+			break
+		}
+
+		key := *(*uint32)(keyPtr)
+		elem := *(*uint64)(elemPtr)
+		got[key] = elem
+	}
+
+	if len(got) != 31 {
+		t.Errorf("Iteration got %d entries, want 31: %+v", len(got), got)
+	}
+
+	key = uint32(0)
+	elem = uint64(256 + 0)
+
+	for i := 0; i < 31; i++ {
+		key += 1
+		elem += 1
+		gotElem, ok := got[key]
+		if !ok {
+			t.Errorf("Iteration missing key %d", key)
+			continue
+		}
+		if gotElem != elem {
+			t.Errorf("Iteration key %d got elem %d want %d", key, gotElem, elem)
+		}
+	}
+}
+
+// Deleted keys shouldn't be visible in iteration.
+func TestTableIterationDelete(t *testing.T) {
+	m, typ := maps.NewTestMap[uint32, uint64](8)
+
+	key := uint32(0)
+	elem := uint64(256 + 0)
+
+	for i := 0; i < 31; i++ {
+		key += 1
+		elem += 1
+		m.Put(typ, unsafe.Pointer(&key), unsafe.Pointer(&elem))
+
+		if maps.DebugLog {
+			fmt.Printf("After put %d: %v\n", key, m)
+		}
+	}
+
+	got := make(map[uint32]uint64)
+	first := true
+	deletedKey := uint32(1)
+	it := new(maps.Iter)
+	it.Init(typ, m)
+	for {
+		it.Next()
+		keyPtr, elemPtr := it.Key(), it.Elem()
+		if keyPtr == nil {
+			break
+		}
+
+		key := *(*uint32)(keyPtr)
+		elem := *(*uint64)(elemPtr)
+		got[key] = elem
+
+		if first {
+			first = false
+
+			// If the key we intended to delete was the one we just
+			// saw, pick another to delete.
+			if key == deletedKey {
+				deletedKey++
+			}
+			m.Delete(typ, unsafe.Pointer(&deletedKey))
+		}
+	}
+
+	if len(got) != 30 {
+		t.Errorf("Iteration got %d entries, want 30: %+v", len(got), got)
+	}
+
+	key = uint32(0)
+	elem = uint64(256 + 0)
+
+	for i := 0; i < 31; i++ {
+		key += 1
+		elem += 1
+
+		wantOK := true
+		if key == deletedKey {
+			wantOK = false
+		}
+
+		gotElem, gotOK := got[key]
+		if gotOK != wantOK {
+			t.Errorf("Iteration key %d got ok %v want ok %v", key, gotOK, wantOK)
+			continue
+		}
+		if wantOK && gotElem != elem {
+			t.Errorf("Iteration key %d got elem %d want %d", key, gotElem, elem)
+		}
+	}
+}
+
+// Deleted keys shouldn't be visible in iteration even after a grow.
+func TestTableIterationGrowDelete(t *testing.T) {
+	m, typ := maps.NewTestMap[uint32, uint64](8)
+
+	key := uint32(0)
+	elem := uint64(256 + 0)
+
+	for i := 0; i < 31; i++ {
+		key += 1
+		elem += 1
+		m.Put(typ, unsafe.Pointer(&key), unsafe.Pointer(&elem))
+
+		if maps.DebugLog {
+			fmt.Printf("After put %d: %v\n", key, m)
+		}
+	}
+
+	got := make(map[uint32]uint64)
+	first := true
+	deletedKey := uint32(1)
+	it := new(maps.Iter)
+	it.Init(typ, m)
+	for {
+		it.Next()
+		keyPtr, elemPtr := it.Key(), it.Elem()
+		if keyPtr == nil {
+			break
+		}
+
+		key := *(*uint32)(keyPtr)
+		elem := *(*uint64)(elemPtr)
+		got[key] = elem
+
+		if first {
+			first = false
+
+			// If the key we intended to delete was the one we just
+			// saw, pick another to delete.
+			if key == deletedKey {
+				deletedKey++
+			}
+
+			// Double the number of elements to force a grow.
+			key := uint32(32)
+			elem := uint64(256 + 32)
+
+			for i := 0; i < 31; i++ {
+				key += 1
+				elem += 1
+				m.Put(typ, unsafe.Pointer(&key), unsafe.Pointer(&elem))
+
+				if maps.DebugLog {
+					fmt.Printf("After put %d: %v\n", key, m)
+				}
+			}
+
+			// Then delete from the grown map.
+			m.Delete(typ, unsafe.Pointer(&deletedKey))
+		}
+	}
+
+	// Don't check length: the number of new elements we'll see is
+	// unspecified.
+
+	// Check values only of the original pre-iteration entries.
+	key = uint32(0)
+	elem = uint64(256 + 0)
+
+	for i := 0; i < 31; i++ {
+		key += 1
+		elem += 1
+
+		wantOK := true
+		if key == deletedKey {
+			wantOK = false
+		}
+
+		gotElem, gotOK := got[key]
+		if gotOK != wantOK {
+			t.Errorf("Iteration key %d got ok %v want ok %v", key, gotOK, wantOK)
+			continue
+		}
+		if wantOK && gotElem != elem {
+			t.Errorf("Iteration key %d got elem %d want %d", key, gotElem, elem)
+		}
+	}
+}
+
+func testTableIterationGrowDuplicate(t *testing.T, grow int) {
+	m, typ := maps.NewTestMap[uint32, uint64](8)
+
+	key := uint32(0)
+	elem := uint64(256 + 0)
+
+	for i := 0; i < 31; i++ {
+		key += 1
+		elem += 1
+		m.Put(typ, unsafe.Pointer(&key), unsafe.Pointer(&elem))
+
+		if maps.DebugLog {
+			fmt.Printf("After put %d: %v\n", key, m)
+		}
+	}
+
+	got := make(map[uint32]uint64)
+	it := new(maps.Iter)
+	it.Init(typ, m)
+	for i := 0; ; i++ {
+		it.Next()
+		keyPtr, elemPtr := it.Key(), it.Elem()
+		if keyPtr == nil {
+			break
+		}
+
+		key := *(*uint32)(keyPtr)
+		elem := *(*uint64)(elemPtr)
+		if elem != 256+uint64(key) {
+			t.Errorf("iteration got key %d elem %d want elem %d", key, elem, 256+uint64(key))
+		}
+		if _, ok := got[key]; ok {
+			t.Errorf("iteration got key %d more than once", key)
+		}
+		got[key] = elem
+
+		// Grow halfway through iteration.
+		if i == 16 {
+			key := uint32(32)
+			elem := uint64(256 + 32)
+
+			for i := 0; i < grow; i++ {
+				key += 1
+				elem += 1
+				m.Put(typ, unsafe.Pointer(&key), unsafe.Pointer(&elem))
+
+				if maps.DebugLog {
+					fmt.Printf("After put %d: %v\n", key, m)
+				}
+			}
+		}
+	}
+
+	// Don't check length: the number of new elements we'll see is
+	// unspecified.
+}
+
+// Grow should not allow duplicate keys to appear.
+func TestTableIterationGrowDuplicate(t *testing.T) {
+	// Small grow, only enough to cause table grow.
+	t.Run("grow", func(t *testing.T) { testTableIterationGrowDuplicate(t, 32) })
+
+	// Large grow, to cause table split.
+	t.Run("split", func(t *testing.T) { testTableIterationGrowDuplicate(t, 2*maps.MaxTableCapacity) })
+}
+
+func TestAlignUpPow2(t *testing.T) {
+	tests := []struct {
+		in       uint64
+		want     uint64
+		overflow bool
+	}{
+		{
+			in:   0,
+			want: 0,
+		},
+		{
+			in:   3,
+			want: 4,
+		},
+		{
+			in:   4,
+			want: 4,
+		},
+		{
+			in:   1 << 63,
+			want: 1 << 63,
+		},
+		{
+			in:   (1 << 63) - 1,
+			want: 1 << 63,
+		},
+		{
+			in:       (1 << 63) + 1,
+			overflow: true,
+		},
+	}
+
+	for _, tc := range tests {
+		got, overflow := maps.AlignUpPow2(tc.in)
+		if got != tc.want {
+			t.Errorf("alignUpPow2(%d) got %d, want %d", tc.in, got, tc.want)
+		}
+		if overflow != tc.overflow {
+			t.Errorf("alignUpPow2(%d) got overflow %v, want %v", tc.in, overflow, tc.overflow)
+		}
+	}
+}
+
+// Verify that a map with zero-size slot is safe to use.
+func TestMapZeroSizeSlot(t *testing.T) {
+	m, typ := maps.NewTestMap[struct{}, struct{}](16)
+
+	key := struct{}{}
+	elem := struct{}{}
+
+	m.Put(typ, unsafe.Pointer(&key), unsafe.Pointer(&elem))
+
+	if maps.DebugLog {
+		fmt.Printf("After put %d: %v\n", key, m)
+	}
+
+	got, ok := m.Get(typ, unsafe.Pointer(&key))
+	if !ok {
+		t.Errorf("Get(%d) got ok false want true", key)
+	}
+	gotElem := *(*struct{})(got)
+	if gotElem != elem {
+		t.Errorf("Get(%d) got elem %d want %d", key, gotElem, elem)
+	}
+
+	tab := m.TableFor(typ, unsafe.Pointer(&key))
+	start := tab.GroupsStart()
+	length := tab.GroupsLength()
+	end := unsafe.Pointer(uintptr(start) + length*typ.GroupSize - 1) // inclusive to ensure we have a valid pointer
+	if uintptr(got) < uintptr(start) || uintptr(got) > uintptr(end) {
+		t.Errorf("elem address outside groups allocation; got %p want [%p, %p]", got, start, end)
+	}
+}
+
+func TestMapIndirect(t *testing.T) {
+	type big [abi.SwissMapMaxKeyBytes + abi.SwissMapMaxElemBytes]byte
+
+	m, typ := maps.NewTestMap[big, big](8)
+
+	key := big{}
+	elem := big{}
+	elem[0] = 128
+
+	for i := 0; i < 31; i++ {
+		key[0] += 1
+		elem[0] += 1
+		m.Put(typ, unsafe.Pointer(&key), unsafe.Pointer(&elem))
+
+		if maps.DebugLog {
+			fmt.Printf("After put %v: %v\n", key, m)
+		}
+	}
+
+	if m.Used() != 31 {
+		t.Errorf("Used() used got %d want 31", m.Used())
+	}
+
+	key = big{}
+	elem = big{}
+	elem[0] = 128
+
+	for i := 0; i < 31; i++ {
+		key[0] += 1
+		elem[0] += 1
+		got, ok := m.Get(typ, unsafe.Pointer(&key))
+		if !ok {
+			t.Errorf("Get(%v) got ok false want true", key)
+		}
+		gotElem := *(*big)(got)
+		if gotElem != elem {
+			t.Errorf("Get(%v) got elem %v want %v", key, gotElem, elem)
+		}
+	}
+}
+
+// Delete should clear element. See https://go.dev/issue/25936.
+func TestMapDeleteClear(t *testing.T) {
+	m, typ := maps.NewTestMap[int64, int64](8)
+
+	key := int64(0)
+	elem := int64(128)
+
+	m.Put(typ, unsafe.Pointer(&key), unsafe.Pointer(&elem))
+
+	if maps.DebugLog {
+		fmt.Printf("After put %d: %v\n", key, m)
+	}
+
+	got, ok := m.Get(typ, unsafe.Pointer(&key))
+	if !ok {
+		t.Errorf("Get(%d) got ok false want true", key)
+	}
+	gotElem := *(*int64)(got)
+	if gotElem != elem {
+		t.Errorf("Get(%d) got elem %d want %d", key, gotElem, elem)
+	}
+
+	m.Delete(typ, unsafe.Pointer(&key))
+
+	gotElem = *(*int64)(got)
+	if gotElem != 0 {
+		t.Errorf("Delete(%d) failed to clear element. got %d want 0", key, gotElem)
+	}
+}
diff --git a/src/internal/runtime/maps/runtime.go b/src/internal/runtime/maps/runtime.go
new file mode 100644
index 00000000..3d06f54f
--- /dev/null
+++ b/src/internal/runtime/maps/runtime.go
@@ -0,0 +1,30 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package maps
+
+import (
+	"internal/abi"
+	"unsafe"
+)
+
+// Functions below pushed from runtime.
+
+//go:linkname fatal
+func fatal(s string)
+
+//go:linkname rand
+func rand() uint64
+
+//go:linkname typedmemmove
+func typedmemmove(typ *abi.Type, dst, src unsafe.Pointer)
+
+//go:linkname typedmemclr
+func typedmemclr(typ *abi.Type, ptr unsafe.Pointer)
+
+//go:linkname newarray
+func newarray(typ *abi.Type, n int) unsafe.Pointer
+
+//go:linkname newobject
+func newobject(typ *abi.Type) unsafe.Pointer
diff --git a/src/internal/runtime/maps/runtime_fast32_swiss.go b/src/internal/runtime/maps/runtime_fast32_swiss.go
new file mode 100644
index 00000000..46023cc9
--- /dev/null
+++ b/src/internal/runtime/maps/runtime_fast32_swiss.go
@@ -0,0 +1,470 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build goexperiment.swissmap
+
+package maps
+
+import (
+	"internal/abi"
+	"internal/race"
+	"internal/runtime/sys"
+	"unsafe"
+)
+
+//go:linkname runtime_mapaccess1_fast32 runtime.mapaccess1_fast32
+func runtime_mapaccess1_fast32(typ *abi.SwissMapType, m *Map, key uint32) unsafe.Pointer {
+	if race.Enabled && m != nil {
+		callerpc := sys.GetCallerPC()
+		pc := abi.FuncPCABIInternal(runtime_mapaccess1)
+		race.ReadPC(unsafe.Pointer(m), callerpc, pc)
+	}
+
+	if m == nil || m.Used() == 0 {
+		return unsafe.Pointer(&zeroVal[0])
+	}
+
+	if m.writing != 0 {
+		fatal("concurrent map read and map write")
+		return nil
+	}
+
+	if m.dirLen == 0 {
+		g := groupReference{
+			data: m.dirPtr,
+		}
+		full := g.ctrls().matchFull()
+		slotKey := g.key(typ, 0)
+		slotSize := typ.SlotSize
+		for full != 0 {
+			if key == *(*uint32)(slotKey) && full.lowestSet() {
+				slotElem := unsafe.Pointer(uintptr(slotKey) + typ.ElemOff)
+				return slotElem
+			}
+			slotKey = unsafe.Pointer(uintptr(slotKey) + slotSize)
+			full = full.shiftOutLowest()
+		}
+		return unsafe.Pointer(&zeroVal[0])
+	}
+
+	k := key
+	hash := typ.Hasher(abi.NoEscape(unsafe.Pointer(&k)), m.seed)
+
+	// Select table.
+	idx := m.directoryIndex(hash)
+	t := m.directoryAt(idx)
+
+	// Probe table.
+	seq := makeProbeSeq(h1(hash), t.groups.lengthMask)
+	for ; ; seq = seq.next() {
+		g := t.groups.group(typ, seq.offset)
+
+		match := g.ctrls().matchH2(h2(hash))
+
+		for match != 0 {
+			i := match.first()
+
+			slotKey := g.key(typ, i)
+			if key == *(*uint32)(slotKey) {
+				slotElem := unsafe.Pointer(uintptr(slotKey) + typ.ElemOff)
+				return slotElem
+			}
+			match = match.removeFirst()
+		}
+
+		match = g.ctrls().matchEmpty()
+		if match != 0 {
+			// Finding an empty slot means we've reached the end of
+			// the probe sequence.
+			return unsafe.Pointer(&zeroVal[0])
+		}
+	}
+}
+
+//go:linkname runtime_mapaccess2_fast32 runtime.mapaccess2_fast32
+func runtime_mapaccess2_fast32(typ *abi.SwissMapType, m *Map, key uint32) (unsafe.Pointer, bool) {
+	if race.Enabled && m != nil {
+		callerpc := sys.GetCallerPC()
+		pc := abi.FuncPCABIInternal(runtime_mapaccess1)
+		race.ReadPC(unsafe.Pointer(m), callerpc, pc)
+	}
+
+	if m == nil || m.Used() == 0 {
+		return unsafe.Pointer(&zeroVal[0]), false
+	}
+
+	if m.writing != 0 {
+		fatal("concurrent map read and map write")
+		return nil, false
+	}
+
+	if m.dirLen == 0 {
+		g := groupReference{
+			data: m.dirPtr,
+		}
+		full := g.ctrls().matchFull()
+		slotKey := g.key(typ, 0)
+		slotSize := typ.SlotSize
+		for full != 0 {
+			if key == *(*uint32)(slotKey) && full.lowestSet() {
+				slotElem := unsafe.Pointer(uintptr(slotKey) + typ.ElemOff)
+				return slotElem, true
+			}
+			slotKey = unsafe.Pointer(uintptr(slotKey) + slotSize)
+			full = full.shiftOutLowest()
+		}
+		return unsafe.Pointer(&zeroVal[0]), false
+	}
+
+	k := key
+	hash := typ.Hasher(abi.NoEscape(unsafe.Pointer(&k)), m.seed)
+
+	// Select table.
+	idx := m.directoryIndex(hash)
+	t := m.directoryAt(idx)
+
+	// Probe table.
+	seq := makeProbeSeq(h1(hash), t.groups.lengthMask)
+	for ; ; seq = seq.next() {
+		g := t.groups.group(typ, seq.offset)
+
+		match := g.ctrls().matchH2(h2(hash))
+
+		for match != 0 {
+			i := match.first()
+
+			slotKey := g.key(typ, i)
+			if key == *(*uint32)(slotKey) {
+				slotElem := unsafe.Pointer(uintptr(slotKey) + typ.ElemOff)
+				return slotElem, true
+			}
+			match = match.removeFirst()
+		}
+
+		match = g.ctrls().matchEmpty()
+		if match != 0 {
+			// Finding an empty slot means we've reached the end of
+			// the probe sequence.
+			return unsafe.Pointer(&zeroVal[0]), false
+		}
+	}
+}
+
+func (m *Map) putSlotSmallFast32(typ *abi.SwissMapType, hash uintptr, key uint32) unsafe.Pointer {
+	g := groupReference{
+		data: m.dirPtr,
+	}
+
+	match := g.ctrls().matchH2(h2(hash))
+
+	// Look for an existing slot containing this key.
+	for match != 0 {
+		i := match.first()
+
+		slotKey := g.key(typ, i)
+		if key == *(*uint32)(slotKey) {
+			slotElem := g.elem(typ, i)
+			return slotElem
+		}
+		match = match.removeFirst()
+	}
+
+	// There can't be deleted slots, small maps can't have them
+	// (see deleteSmall). Use matchEmptyOrDeleted as it is a bit
+	// more efficient than matchEmpty.
+	match = g.ctrls().matchEmptyOrDeleted()
+	if match == 0 {
+		fatal("small map with no empty slot (concurrent map writes?)")
+	}
+
+	i := match.first()
+
+	slotKey := g.key(typ, i)
+	*(*uint32)(slotKey) = key
+
+	slotElem := g.elem(typ, i)
+
+	g.ctrls().set(i, ctrl(h2(hash)))
+	m.used++
+
+	return slotElem
+}
+
+//go:linkname runtime_mapassign_fast32 runtime.mapassign_fast32
+func runtime_mapassign_fast32(typ *abi.SwissMapType, m *Map, key uint32) unsafe.Pointer {
+	if m == nil {
+		panic(errNilAssign)
+	}
+	if race.Enabled {
+		callerpc := sys.GetCallerPC()
+		pc := abi.FuncPCABIInternal(runtime_mapassign)
+		race.WritePC(unsafe.Pointer(m), callerpc, pc)
+	}
+	if m.writing != 0 {
+		fatal("concurrent map writes")
+	}
+
+	k := key
+	hash := typ.Hasher(abi.NoEscape(unsafe.Pointer(&k)), m.seed)
+
+	// Set writing after calling Hasher, since Hasher may panic, in which
+	// case we have not actually done a write.
+	m.writing ^= 1 // toggle, see comment on writing
+
+	if m.dirPtr == nil {
+		m.growToSmall(typ)
+	}
+
+	if m.dirLen == 0 {
+		if m.used < abi.SwissMapGroupSlots {
+			elem := m.putSlotSmallFast32(typ, hash, key)
+
+			if m.writing == 0 {
+				fatal("concurrent map writes")
+			}
+			m.writing ^= 1
+
+			return elem
+		}
+
+		// Can't fit another entry, grow to full size map.
+		m.growToTable(typ)
+	}
+
+	var slotElem unsafe.Pointer
+outer:
+	for {
+		// Select table.
+		idx := m.directoryIndex(hash)
+		t := m.directoryAt(idx)
+
+		seq := makeProbeSeq(h1(hash), t.groups.lengthMask)
+
+		// As we look for a match, keep track of the first deleted slot
+		// we find, which we'll use to insert the new entry if
+		// necessary.
+		var firstDeletedGroup groupReference
+		var firstDeletedSlot uintptr
+
+		for ; ; seq = seq.next() {
+			g := t.groups.group(typ, seq.offset)
+			match := g.ctrls().matchH2(h2(hash))
+
+			// Look for an existing slot containing this key.
+			for match != 0 {
+				i := match.first()
+
+				slotKey := g.key(typ, i)
+				if key == *(*uint32)(slotKey) {
+					slotElem = g.elem(typ, i)
+
+					t.checkInvariants(typ, m)
+					break outer
+				}
+				match = match.removeFirst()
+			}
+
+			// No existing slot for this key in this group. Is this the end
+			// of the probe sequence?
+			match = g.ctrls().matchEmptyOrDeleted()
+			if match == 0 {
+				continue // nothing but filled slots. Keep probing.
+			}
+			i := match.first()
+			if g.ctrls().get(i) == ctrlDeleted {
+				// There are some deleted slots. Remember
+				// the first one, and keep probing.
+				if firstDeletedGroup.data == nil {
+					firstDeletedGroup = g
+					firstDeletedSlot = i
+				}
+				continue
+			}
+			// We've found an empty slot, which means we've reached the end of
+			// the probe sequence.
+
+			// If we found a deleted slot along the way, we can
+			// replace it without consuming growthLeft.
+			if firstDeletedGroup.data != nil {
+				g = firstDeletedGroup
+				i = firstDeletedSlot
+				t.growthLeft++ // will be decremented below to become a no-op.
+			}
+
+			// If there is room left to grow, just insert the new entry.
+			if t.growthLeft > 0 {
+				slotKey := g.key(typ, i)
+				*(*uint32)(slotKey) = key
+
+				slotElem = g.elem(typ, i)
+
+				g.ctrls().set(i, ctrl(h2(hash)))
+				t.growthLeft--
+				t.used++
+				m.used++
+
+				t.checkInvariants(typ, m)
+				break outer
+			}
+
+			t.rehash(typ, m)
+			continue outer
+		}
+	}
+
+	if m.writing == 0 {
+		fatal("concurrent map writes")
+	}
+	m.writing ^= 1
+
+	return slotElem
+}
+
+// Key is a 32-bit pointer (only called on 32-bit GOARCH). This source is identical to fast64ptr.
+//
+// TODO(prattmic): With some compiler refactoring we could avoid duplication of this function.
+//
+//go:linkname runtime_mapassign_fast32ptr runtime.mapassign_fast32ptr
+func runtime_mapassign_fast32ptr(typ *abi.SwissMapType, m *Map, key unsafe.Pointer) unsafe.Pointer {
+	if m == nil {
+		panic(errNilAssign)
+	}
+	if race.Enabled {
+		callerpc := sys.GetCallerPC()
+		pc := abi.FuncPCABIInternal(runtime_mapassign)
+		race.WritePC(unsafe.Pointer(m), callerpc, pc)
+	}
+	if m.writing != 0 {
+		fatal("concurrent map writes")
+	}
+
+	k := key
+	hash := typ.Hasher(abi.NoEscape(unsafe.Pointer(&k)), m.seed)
+
+	// Set writing after calling Hasher, since Hasher may panic, in which
+	// case we have not actually done a write.
+	m.writing ^= 1 // toggle, see comment on writing
+
+	if m.dirPtr == nil {
+		m.growToSmall(typ)
+	}
+
+	if m.dirLen == 0 {
+		if m.used < abi.SwissMapGroupSlots {
+			elem := m.putSlotSmallFastPtr(typ, hash, key)
+
+			if m.writing == 0 {
+				fatal("concurrent map writes")
+			}
+			m.writing ^= 1
+
+			return elem
+		}
+
+		// Can't fit another entry, grow to full size map.
+		m.growToTable(typ)
+	}
+
+	var slotElem unsafe.Pointer
+outer:
+	for {
+		// Select table.
+		idx := m.directoryIndex(hash)
+		t := m.directoryAt(idx)
+
+		seq := makeProbeSeq(h1(hash), t.groups.lengthMask)
+
+		// As we look for a match, keep track of the first deleted slot we
+		// find, which we'll use to insert the new entry if necessary.
+		var firstDeletedGroup groupReference
+		var firstDeletedSlot uintptr
+
+		for ; ; seq = seq.next() {
+			g := t.groups.group(typ, seq.offset)
+			match := g.ctrls().matchH2(h2(hash))
+
+			// Look for an existing slot containing this key.
+			for match != 0 {
+				i := match.first()
+
+				slotKey := g.key(typ, i)
+				if key == *(*unsafe.Pointer)(slotKey) {
+					slotElem = g.elem(typ, i)
+
+					t.checkInvariants(typ, m)
+					break outer
+				}
+				match = match.removeFirst()
+			}
+
+			// No existing slot for this key in this group. Is this the end
+			// of the probe sequence?
+			match = g.ctrls().matchEmptyOrDeleted()
+			if match == 0 {
+				continue // nothing but filled slots. Keep probing.
+			}
+			i := match.first()
+			if g.ctrls().get(i) == ctrlDeleted {
+				// There are some deleted slots. Remember
+				// the first one, and keep probing.
+				if firstDeletedGroup.data == nil {
+					firstDeletedGroup = g
+					firstDeletedSlot = i
+				}
+				continue
+			}
+			// We've found an empty slot, which means we've reached the end of
+			// the probe sequence.
+
+			// If we found a deleted slot along the way, we can
+			// replace it without consuming growthLeft.
+			if firstDeletedGroup.data != nil {
+				g = firstDeletedGroup
+				i = firstDeletedSlot
+				t.growthLeft++ // will be decremented below to become a no-op.
+			}
+
+			// If there is room left to grow, just insert the new entry.
+			if t.growthLeft > 0 {
+				slotKey := g.key(typ, i)
+				*(*unsafe.Pointer)(slotKey) = key
+
+				slotElem = g.elem(typ, i)
+
+				g.ctrls().set(i, ctrl(h2(hash)))
+				t.growthLeft--
+				t.used++
+				m.used++
+
+				t.checkInvariants(typ, m)
+				break outer
+			}
+
+			t.rehash(typ, m)
+			continue outer
+		}
+	}
+
+	if m.writing == 0 {
+		fatal("concurrent map writes")
+	}
+	m.writing ^= 1
+
+	return slotElem
+}
+
+//go:linkname runtime_mapdelete_fast32 runtime.mapdelete_fast32
+func runtime_mapdelete_fast32(typ *abi.SwissMapType, m *Map, key uint32) {
+	if race.Enabled {
+		callerpc := sys.GetCallerPC()
+		pc := abi.FuncPCABIInternal(runtime_mapassign)
+		race.WritePC(unsafe.Pointer(m), callerpc, pc)
+	}
+
+	if m == nil || m.Used() == 0 {
+		return
+	}
+
+	m.Delete(typ, abi.NoEscape(unsafe.Pointer(&key)))
+}
diff --git a/src/internal/runtime/maps/runtime_fast64_swiss.go b/src/internal/runtime/maps/runtime_fast64_swiss.go
new file mode 100644
index 00000000..6bc6b2f0
--- /dev/null
+++ b/src/internal/runtime/maps/runtime_fast64_swiss.go
@@ -0,0 +1,509 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build goexperiment.swissmap
+
+package maps
+
+import (
+	"internal/abi"
+	"internal/race"
+	"internal/runtime/sys"
+	"unsafe"
+)
+
+//go:linkname runtime_mapaccess1_fast64 runtime.mapaccess1_fast64
+func runtime_mapaccess1_fast64(typ *abi.SwissMapType, m *Map, key uint64) unsafe.Pointer {
+	if race.Enabled && m != nil {
+		callerpc := sys.GetCallerPC()
+		pc := abi.FuncPCABIInternal(runtime_mapaccess1)
+		race.ReadPC(unsafe.Pointer(m), callerpc, pc)
+	}
+
+	if m == nil || m.Used() == 0 {
+		return unsafe.Pointer(&zeroVal[0])
+	}
+
+	if m.writing != 0 {
+		fatal("concurrent map read and map write")
+		return nil
+	}
+
+	if m.dirLen == 0 {
+		g := groupReference{
+			data: m.dirPtr,
+		}
+		full := g.ctrls().matchFull()
+		slotKey := g.key(typ, 0)
+		slotSize := typ.SlotSize
+		for full != 0 {
+			if key == *(*uint64)(slotKey) && full.lowestSet() {
+				slotElem := unsafe.Pointer(uintptr(slotKey) + 8)
+				return slotElem
+			}
+			slotKey = unsafe.Pointer(uintptr(slotKey) + slotSize)
+			full = full.shiftOutLowest()
+		}
+		return unsafe.Pointer(&zeroVal[0])
+	}
+
+	k := key
+	hash := typ.Hasher(abi.NoEscape(unsafe.Pointer(&k)), m.seed)
+
+	// Select table.
+	idx := m.directoryIndex(hash)
+	t := m.directoryAt(idx)
+
+	// Probe table.
+	seq := makeProbeSeq(h1(hash), t.groups.lengthMask)
+	for ; ; seq = seq.next() {
+		g := t.groups.group(typ, seq.offset)
+
+		match := g.ctrls().matchH2(h2(hash))
+
+		for match != 0 {
+			i := match.first()
+
+			slotKey := g.key(typ, i)
+			if key == *(*uint64)(slotKey) {
+				slotElem := unsafe.Pointer(uintptr(slotKey) + 8)
+				return slotElem
+			}
+			match = match.removeFirst()
+		}
+
+		match = g.ctrls().matchEmpty()
+		if match != 0 {
+			// Finding an empty slot means we've reached the end of
+			// the probe sequence.
+			return unsafe.Pointer(&zeroVal[0])
+		}
+	}
+}
+
+//go:linkname runtime_mapaccess2_fast64 runtime.mapaccess2_fast64
+func runtime_mapaccess2_fast64(typ *abi.SwissMapType, m *Map, key uint64) (unsafe.Pointer, bool) {
+	if race.Enabled && m != nil {
+		callerpc := sys.GetCallerPC()
+		pc := abi.FuncPCABIInternal(runtime_mapaccess1)
+		race.ReadPC(unsafe.Pointer(m), callerpc, pc)
+	}
+
+	if m == nil || m.Used() == 0 {
+		return unsafe.Pointer(&zeroVal[0]), false
+	}
+
+	if m.writing != 0 {
+		fatal("concurrent map read and map write")
+		return nil, false
+	}
+
+	if m.dirLen == 0 {
+		g := groupReference{
+			data: m.dirPtr,
+		}
+		full := g.ctrls().matchFull()
+		slotKey := g.key(typ, 0)
+		slotSize := typ.SlotSize
+		for full != 0 {
+			if key == *(*uint64)(slotKey) && full.lowestSet() {
+				slotElem := unsafe.Pointer(uintptr(slotKey) + 8)
+				return slotElem, true
+			}
+			slotKey = unsafe.Pointer(uintptr(slotKey) + slotSize)
+			full = full.shiftOutLowest()
+		}
+		return unsafe.Pointer(&zeroVal[0]), false
+	}
+
+	k := key
+	hash := typ.Hasher(abi.NoEscape(unsafe.Pointer(&k)), m.seed)
+
+	// Select table.
+	idx := m.directoryIndex(hash)
+	t := m.directoryAt(idx)
+
+	// Probe table.
+	seq := makeProbeSeq(h1(hash), t.groups.lengthMask)
+	for ; ; seq = seq.next() {
+		g := t.groups.group(typ, seq.offset)
+
+		match := g.ctrls().matchH2(h2(hash))
+
+		for match != 0 {
+			i := match.first()
+
+			slotKey := g.key(typ, i)
+			if key == *(*uint64)(slotKey) {
+				slotElem := unsafe.Pointer(uintptr(slotKey) + 8)
+				return slotElem, true
+			}
+			match = match.removeFirst()
+		}
+
+		match = g.ctrls().matchEmpty()
+		if match != 0 {
+			// Finding an empty slot means we've reached the end of
+			// the probe sequence.
+			return unsafe.Pointer(&zeroVal[0]), false
+		}
+	}
+}
+
+func (m *Map) putSlotSmallFast64(typ *abi.SwissMapType, hash uintptr, key uint64) unsafe.Pointer {
+	g := groupReference{
+		data: m.dirPtr,
+	}
+
+	match := g.ctrls().matchH2(h2(hash))
+
+	// Look for an existing slot containing this key.
+	for match != 0 {
+		i := match.first()
+
+		slotKey := g.key(typ, i)
+		if key == *(*uint64)(slotKey) {
+			slotElem := g.elem(typ, i)
+			return slotElem
+		}
+		match = match.removeFirst()
+	}
+
+	// There can't be deleted slots, small maps can't have them
+	// (see deleteSmall). Use matchEmptyOrDeleted as it is a bit
+	// more efficient than matchEmpty.
+	match = g.ctrls().matchEmptyOrDeleted()
+	if match == 0 {
+		fatal("small map with no empty slot (concurrent map writes?)")
+	}
+
+	i := match.first()
+
+	slotKey := g.key(typ, i)
+	*(*uint64)(slotKey) = key
+
+	slotElem := g.elem(typ, i)
+
+	g.ctrls().set(i, ctrl(h2(hash)))
+	m.used++
+
+	return slotElem
+}
+
+//go:linkname runtime_mapassign_fast64 runtime.mapassign_fast64
+func runtime_mapassign_fast64(typ *abi.SwissMapType, m *Map, key uint64) unsafe.Pointer {
+	if m == nil {
+		panic(errNilAssign)
+	}
+	if race.Enabled {
+		callerpc := sys.GetCallerPC()
+		pc := abi.FuncPCABIInternal(runtime_mapassign)
+		race.WritePC(unsafe.Pointer(m), callerpc, pc)
+	}
+	if m.writing != 0 {
+		fatal("concurrent map writes")
+	}
+
+	k := key
+	hash := typ.Hasher(abi.NoEscape(unsafe.Pointer(&k)), m.seed)
+
+	// Set writing after calling Hasher, since Hasher may panic, in which
+	// case we have not actually done a write.
+	m.writing ^= 1 // toggle, see comment on writing
+
+	if m.dirPtr == nil {
+		m.growToSmall(typ)
+	}
+
+	if m.dirLen == 0 {
+		if m.used < abi.SwissMapGroupSlots {
+			elem := m.putSlotSmallFast64(typ, hash, key)
+
+			if m.writing == 0 {
+				fatal("concurrent map writes")
+			}
+			m.writing ^= 1
+
+			return elem
+		}
+
+		// Can't fit another entry, grow to full size map.
+		m.growToTable(typ)
+	}
+
+	var slotElem unsafe.Pointer
+outer:
+	for {
+		// Select table.
+		idx := m.directoryIndex(hash)
+		t := m.directoryAt(idx)
+
+		seq := makeProbeSeq(h1(hash), t.groups.lengthMask)
+
+		// As we look for a match, keep track of the first deleted slot
+		// we find, which we'll use to insert the new entry if
+		// necessary.
+		var firstDeletedGroup groupReference
+		var firstDeletedSlot uintptr
+
+		for ; ; seq = seq.next() {
+			g := t.groups.group(typ, seq.offset)
+			match := g.ctrls().matchH2(h2(hash))
+
+			// Look for an existing slot containing this key.
+			for match != 0 {
+				i := match.first()
+
+				slotKey := g.key(typ, i)
+				if key == *(*uint64)(slotKey) {
+					slotElem = g.elem(typ, i)
+
+					t.checkInvariants(typ, m)
+					break outer
+				}
+				match = match.removeFirst()
+			}
+
+			// No existing slot for this key in this group. Is this the end
+			// of the probe sequence?
+			match = g.ctrls().matchEmptyOrDeleted()
+			if match == 0 {
+				continue // nothing but filled slots. Keep probing.
+			}
+			i := match.first()
+			if g.ctrls().get(i) == ctrlDeleted {
+				// There are some deleted slots. Remember
+				// the first one, and keep probing.
+				if firstDeletedGroup.data == nil {
+					firstDeletedGroup = g
+					firstDeletedSlot = i
+				}
+				continue
+			}
+			// We've found an empty slot, which means we've reached the end of
+			// the probe sequence.
+
+			// If we found a deleted slot along the way, we can
+			// replace it without consuming growthLeft.
+			if firstDeletedGroup.data != nil {
+				g = firstDeletedGroup
+				i = firstDeletedSlot
+				t.growthLeft++ // will be decremented below to become a no-op.
+			}
+
+			// If there is room left to grow, just insert the new entry.
+			if t.growthLeft > 0 {
+				slotKey := g.key(typ, i)
+				*(*uint64)(slotKey) = key
+
+				slotElem = g.elem(typ, i)
+
+				g.ctrls().set(i, ctrl(h2(hash)))
+				t.growthLeft--
+				t.used++
+				m.used++
+
+				t.checkInvariants(typ, m)
+				break outer
+			}
+
+			t.rehash(typ, m)
+			continue outer
+		}
+	}
+
+	if m.writing == 0 {
+		fatal("concurrent map writes")
+	}
+	m.writing ^= 1
+
+	return slotElem
+}
+
+func (m *Map) putSlotSmallFastPtr(typ *abi.SwissMapType, hash uintptr, key unsafe.Pointer) unsafe.Pointer {
+	g := groupReference{
+		data: m.dirPtr,
+	}
+
+	match := g.ctrls().matchH2(h2(hash))
+
+	// Look for an existing slot containing this key.
+	for match != 0 {
+		i := match.first()
+
+		slotKey := g.key(typ, i)
+		if key == *(*unsafe.Pointer)(slotKey) {
+			slotElem := g.elem(typ, i)
+			return slotElem
+		}
+		match = match.removeFirst()
+	}
+
+	// There can't be deleted slots, small maps can't have them
+	// (see deleteSmall). Use matchEmptyOrDeleted as it is a bit
+	// more efficient than matchEmpty.
+	match = g.ctrls().matchEmptyOrDeleted()
+	if match == 0 {
+		fatal("small map with no empty slot (concurrent map writes?)")
+	}
+
+	i := match.first()
+
+	slotKey := g.key(typ, i)
+	*(*unsafe.Pointer)(slotKey) = key
+
+	slotElem := g.elem(typ, i)
+
+	g.ctrls().set(i, ctrl(h2(hash)))
+	m.used++
+
+	return slotElem
+}
+
+// Key is a 64-bit pointer (only called on 64-bit GOARCH).
+//
+//go:linkname runtime_mapassign_fast64ptr runtime.mapassign_fast64ptr
+func runtime_mapassign_fast64ptr(typ *abi.SwissMapType, m *Map, key unsafe.Pointer) unsafe.Pointer {
+	if m == nil {
+		panic(errNilAssign)
+	}
+	if race.Enabled {
+		callerpc := sys.GetCallerPC()
+		pc := abi.FuncPCABIInternal(runtime_mapassign)
+		race.WritePC(unsafe.Pointer(m), callerpc, pc)
+	}
+	if m.writing != 0 {
+		fatal("concurrent map writes")
+	}
+
+	k := key
+	hash := typ.Hasher(abi.NoEscape(unsafe.Pointer(&k)), m.seed)
+
+	// Set writing after calling Hasher, since Hasher may panic, in which
+	// case we have not actually done a write.
+	m.writing ^= 1 // toggle, see comment on writing
+
+	if m.dirPtr == nil {
+		m.growToSmall(typ)
+	}
+
+	if m.dirLen == 0 {
+		if m.used < abi.SwissMapGroupSlots {
+			elem := m.putSlotSmallFastPtr(typ, hash, key)
+
+			if m.writing == 0 {
+				fatal("concurrent map writes")
+			}
+			m.writing ^= 1
+
+			return elem
+		}
+
+		// Can't fit another entry, grow to full size map.
+		m.growToTable(typ)
+	}
+
+	var slotElem unsafe.Pointer
+outer:
+	for {
+		// Select table.
+		idx := m.directoryIndex(hash)
+		t := m.directoryAt(idx)
+
+		seq := makeProbeSeq(h1(hash), t.groups.lengthMask)
+
+		// As we look for a match, keep track of the first deleted slot
+		// we find, which we'll use to insert the new entry if
+		// necessary.
+		var firstDeletedGroup groupReference
+		var firstDeletedSlot uintptr
+
+		for ; ; seq = seq.next() {
+			g := t.groups.group(typ, seq.offset)
+			match := g.ctrls().matchH2(h2(hash))
+
+			// Look for an existing slot containing this key.
+			for match != 0 {
+				i := match.first()
+
+				slotKey := g.key(typ, i)
+				if key == *(*unsafe.Pointer)(slotKey) {
+					slotElem = g.elem(typ, i)
+
+					t.checkInvariants(typ, m)
+					break outer
+				}
+				match = match.removeFirst()
+			}
+
+			// No existing slot for this key in this group. Is this the end
+			// of the probe sequence?
+			match = g.ctrls().matchEmptyOrDeleted()
+			if match == 0 {
+				continue // nothing but filled slots. Keep probing.
+			}
+			i := match.first()
+			if g.ctrls().get(i) == ctrlDeleted {
+				// There are some deleted slots. Remember
+				// the first one, and keep probing.
+				if firstDeletedGroup.data == nil {
+					firstDeletedGroup = g
+					firstDeletedSlot = i
+				}
+				continue
+			}
+			// We've found an empty slot, which means we've reached the end of
+			// the probe sequence.
+
+			// If we found a deleted slot along the way, we can
+			// replace it without consuming growthLeft.
+			if firstDeletedGroup.data != nil {
+				g = firstDeletedGroup
+				i = firstDeletedSlot
+				t.growthLeft++ // will be decremented below to become a no-op.
+			}
+
+			// If there is room left to grow, just insert the new entry.
+			if t.growthLeft > 0 {
+				slotKey := g.key(typ, i)
+				*(*unsafe.Pointer)(slotKey) = key
+
+				slotElem = g.elem(typ, i)
+
+				g.ctrls().set(i, ctrl(h2(hash)))
+				t.growthLeft--
+				t.used++
+				m.used++
+
+				t.checkInvariants(typ, m)
+				break outer
+			}
+
+			t.rehash(typ, m)
+			continue outer
+		}
+	}
+
+	if m.writing == 0 {
+		fatal("concurrent map writes")
+	}
+	m.writing ^= 1
+
+	return slotElem
+}
+
+//go:linkname runtime_mapdelete_fast64 runtime.mapdelete_fast64
+func runtime_mapdelete_fast64(typ *abi.SwissMapType, m *Map, key uint64) {
+	if race.Enabled {
+		callerpc := sys.GetCallerPC()
+		pc := abi.FuncPCABIInternal(runtime_mapassign)
+		race.WritePC(unsafe.Pointer(m), callerpc, pc)
+	}
+
+	if m == nil || m.Used() == 0 {
+		return
+	}
+
+	m.Delete(typ, abi.NoEscape(unsafe.Pointer(&key)))
+}
diff --git a/src/internal/runtime/maps/runtime_faststr_swiss.go b/src/internal/runtime/maps/runtime_faststr_swiss.go
new file mode 100644
index 00000000..077c05ae
--- /dev/null
+++ b/src/internal/runtime/maps/runtime_faststr_swiss.go
@@ -0,0 +1,408 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build goexperiment.swissmap
+
+package maps
+
+import (
+	"internal/abi"
+	"internal/goarch"
+	"internal/race"
+	"internal/runtime/sys"
+	"unsafe"
+)
+
+func (m *Map) getWithoutKeySmallFastStr(typ *abi.SwissMapType, key string) unsafe.Pointer {
+	g := groupReference{
+		data: m.dirPtr,
+	}
+
+	ctrls := *g.ctrls()
+	slotKey := g.key(typ, 0)
+	slotSize := typ.SlotSize
+
+	// The 64 threshold was chosen based on performance of BenchmarkMapStringKeysEight,
+	// where there are 8 keys to check, all of which don't quick-match the lookup key.
+	// In that case, we can save hashing the lookup key. That savings is worth this extra code
+	// for strings that are long enough that hashing is expensive.
+	if len(key) > 64 {
+		// String hashing and equality might be expensive. Do a quick check first.
+		j := abi.SwissMapGroupSlots
+		for i := range abi.SwissMapGroupSlots {
+			if ctrls&(1<<7) == 0 && longStringQuickEqualityTest(key, *(*string)(slotKey)) {
+				if j < abi.SwissMapGroupSlots {
+					// 2 strings both passed the quick equality test.
+					// Break out of this loop and do it the slow way.
+					goto dohash
+				}
+				j = i
+			}
+			slotKey = unsafe.Pointer(uintptr(slotKey) + slotSize)
+			ctrls >>= 8
+		}
+		if j == abi.SwissMapGroupSlots {
+			// No slot passed the quick test.
+			return nil
+		}
+		// There's exactly one slot that passed the quick test. Do the single expensive comparison.
+		slotKey = g.key(typ, uintptr(j))
+		if key == *(*string)(slotKey) {
+			return unsafe.Pointer(uintptr(slotKey) + 2*goarch.PtrSize)
+		}
+		return nil
+	}
+
+dohash:
+	// This path will cost 1 hash and 1+ε comparisons.
+	hash := typ.Hasher(abi.NoEscape(unsafe.Pointer(&key)), m.seed)
+	h2 := uint8(h2(hash))
+	ctrls = *g.ctrls()
+	slotKey = g.key(typ, 0)
+
+	for range abi.SwissMapGroupSlots {
+		if uint8(ctrls) == h2 && key == *(*string)(slotKey) {
+			return unsafe.Pointer(uintptr(slotKey) + 2*goarch.PtrSize)
+		}
+		slotKey = unsafe.Pointer(uintptr(slotKey) + slotSize)
+		ctrls >>= 8
+	}
+	return nil
+}
+
+// Returns true if a and b might be equal.
+// Returns false if a and b are definitely not equal.
+// Requires len(a)>=8.
+func longStringQuickEqualityTest(a, b string) bool {
+	if len(a) != len(b) {
+		return false
+	}
+	x, y := stringPtr(a), stringPtr(b)
+	// Check first 8 bytes.
+	if *(*[8]byte)(x) != *(*[8]byte)(y) {
+		return false
+	}
+	// Check last 8 bytes.
+	x = unsafe.Pointer(uintptr(x) + uintptr(len(a)) - 8)
+	y = unsafe.Pointer(uintptr(y) + uintptr(len(a)) - 8)
+	if *(*[8]byte)(x) != *(*[8]byte)(y) {
+		return false
+	}
+	return true
+}
+func stringPtr(s string) unsafe.Pointer {
+	type stringStruct struct {
+		ptr unsafe.Pointer
+		len int
+	}
+	return (*stringStruct)(unsafe.Pointer(&s)).ptr
+}
+
+//go:linkname runtime_mapaccess1_faststr runtime.mapaccess1_faststr
+func runtime_mapaccess1_faststr(typ *abi.SwissMapType, m *Map, key string) unsafe.Pointer {
+	if race.Enabled && m != nil {
+		callerpc := sys.GetCallerPC()
+		pc := abi.FuncPCABIInternal(runtime_mapaccess1)
+		race.ReadPC(unsafe.Pointer(m), callerpc, pc)
+	}
+
+	if m == nil || m.Used() == 0 {
+		return unsafe.Pointer(&zeroVal[0])
+	}
+
+	if m.writing != 0 {
+		fatal("concurrent map read and map write")
+		return nil
+	}
+
+	if m.dirLen <= 0 {
+		elem := m.getWithoutKeySmallFastStr(typ, key)
+		if elem == nil {
+			return unsafe.Pointer(&zeroVal[0])
+		}
+		return elem
+	}
+
+	k := key
+	hash := typ.Hasher(abi.NoEscape(unsafe.Pointer(&k)), m.seed)
+
+	// Select table.
+	idx := m.directoryIndex(hash)
+	t := m.directoryAt(idx)
+
+	// Probe table.
+	seq := makeProbeSeq(h1(hash), t.groups.lengthMask)
+	for ; ; seq = seq.next() {
+		g := t.groups.group(typ, seq.offset)
+
+		match := g.ctrls().matchH2(h2(hash))
+
+		for match != 0 {
+			i := match.first()
+
+			slotKey := g.key(typ, i)
+			if key == *(*string)(slotKey) {
+				slotElem := unsafe.Pointer(uintptr(slotKey) + 2*goarch.PtrSize)
+				return slotElem
+			}
+			match = match.removeFirst()
+		}
+
+		match = g.ctrls().matchEmpty()
+		if match != 0 {
+			// Finding an empty slot means we've reached the end of
+			// the probe sequence.
+			return unsafe.Pointer(&zeroVal[0])
+		}
+	}
+}
+
+//go:linkname runtime_mapaccess2_faststr runtime.mapaccess2_faststr
+func runtime_mapaccess2_faststr(typ *abi.SwissMapType, m *Map, key string) (unsafe.Pointer, bool) {
+	if race.Enabled && m != nil {
+		callerpc := sys.GetCallerPC()
+		pc := abi.FuncPCABIInternal(runtime_mapaccess1)
+		race.ReadPC(unsafe.Pointer(m), callerpc, pc)
+	}
+
+	if m == nil || m.Used() == 0 {
+		return unsafe.Pointer(&zeroVal[0]), false
+	}
+
+	if m.writing != 0 {
+		fatal("concurrent map read and map write")
+		return nil, false
+	}
+
+	if m.dirLen <= 0 {
+		elem := m.getWithoutKeySmallFastStr(typ, key)
+		if elem == nil {
+			return unsafe.Pointer(&zeroVal[0]), false
+		}
+		return elem, true
+	}
+
+	k := key
+	hash := typ.Hasher(abi.NoEscape(unsafe.Pointer(&k)), m.seed)
+
+	// Select table.
+	idx := m.directoryIndex(hash)
+	t := m.directoryAt(idx)
+
+	// Probe table.
+	seq := makeProbeSeq(h1(hash), t.groups.lengthMask)
+	for ; ; seq = seq.next() {
+		g := t.groups.group(typ, seq.offset)
+
+		match := g.ctrls().matchH2(h2(hash))
+
+		for match != 0 {
+			i := match.first()
+
+			slotKey := g.key(typ, i)
+			if key == *(*string)(slotKey) {
+				slotElem := unsafe.Pointer(uintptr(slotKey) + 2*goarch.PtrSize)
+				return slotElem, true
+			}
+			match = match.removeFirst()
+		}
+
+		match = g.ctrls().matchEmpty()
+		if match != 0 {
+			// Finding an empty slot means we've reached the end of
+			// the probe sequence.
+			return unsafe.Pointer(&zeroVal[0]), false
+		}
+	}
+}
+
+func (m *Map) putSlotSmallFastStr(typ *abi.SwissMapType, hash uintptr, key string) unsafe.Pointer {
+	g := groupReference{
+		data: m.dirPtr,
+	}
+
+	match := g.ctrls().matchH2(h2(hash))
+
+	// Look for an existing slot containing this key.
+	for match != 0 {
+		i := match.first()
+
+		slotKey := g.key(typ, i)
+		if key == *(*string)(slotKey) {
+			// Key needs update, as the backing storage may differ.
+			*(*string)(slotKey) = key
+			slotElem := g.elem(typ, i)
+			return slotElem
+		}
+		match = match.removeFirst()
+	}
+
+	// There can't be deleted slots, small maps can't have them
+	// (see deleteSmall). Use matchEmptyOrDeleted as it is a bit
+	// more efficient than matchEmpty.
+	match = g.ctrls().matchEmptyOrDeleted()
+	if match == 0 {
+		fatal("small map with no empty slot (concurrent map writes?)")
+	}
+
+	i := match.first()
+
+	slotKey := g.key(typ, i)
+	*(*string)(slotKey) = key
+
+	slotElem := g.elem(typ, i)
+
+	g.ctrls().set(i, ctrl(h2(hash)))
+	m.used++
+
+	return slotElem
+}
+
+//go:linkname runtime_mapassign_faststr runtime.mapassign_faststr
+func runtime_mapassign_faststr(typ *abi.SwissMapType, m *Map, key string) unsafe.Pointer {
+	if m == nil {
+		panic(errNilAssign)
+	}
+	if race.Enabled {
+		callerpc := sys.GetCallerPC()
+		pc := abi.FuncPCABIInternal(runtime_mapassign)
+		race.WritePC(unsafe.Pointer(m), callerpc, pc)
+	}
+	if m.writing != 0 {
+		fatal("concurrent map writes")
+	}
+
+	k := key
+	hash := typ.Hasher(abi.NoEscape(unsafe.Pointer(&k)), m.seed)
+
+	// Set writing after calling Hasher, since Hasher may panic, in which
+	// case we have not actually done a write.
+	m.writing ^= 1 // toggle, see comment on writing
+
+	if m.dirPtr == nil {
+		m.growToSmall(typ)
+	}
+
+	if m.dirLen == 0 {
+		if m.used < abi.SwissMapGroupSlots {
+			elem := m.putSlotSmallFastStr(typ, hash, key)
+
+			if m.writing == 0 {
+				fatal("concurrent map writes")
+			}
+			m.writing ^= 1
+
+			return elem
+		}
+
+		// Can't fit another entry, grow to full size map.
+		m.growToTable(typ)
+	}
+
+	var slotElem unsafe.Pointer
+outer:
+	for {
+		// Select table.
+		idx := m.directoryIndex(hash)
+		t := m.directoryAt(idx)
+
+		seq := makeProbeSeq(h1(hash), t.groups.lengthMask)
+
+		// As we look for a match, keep track of the first deleted slot
+		// we find, which we'll use to insert the new entry if
+		// necessary.
+		var firstDeletedGroup groupReference
+		var firstDeletedSlot uintptr
+
+		for ; ; seq = seq.next() {
+			g := t.groups.group(typ, seq.offset)
+			match := g.ctrls().matchH2(h2(hash))
+
+			// Look for an existing slot containing this key.
+			for match != 0 {
+				i := match.first()
+
+				slotKey := g.key(typ, i)
+				if key == *(*string)(slotKey) {
+					// Key needs update, as the backing
+					// storage may differ.
+					*(*string)(slotKey) = key
+					slotElem = g.elem(typ, i)
+
+					t.checkInvariants(typ, m)
+					break outer
+				}
+				match = match.removeFirst()
+			}
+
+			// No existing slot for this key in this group. Is this the end
+			// of the probe sequence?
+			match = g.ctrls().matchEmptyOrDeleted()
+			if match == 0 {
+				continue // nothing but filled slots. Keep probing.
+			}
+			i := match.first()
+			if g.ctrls().get(i) == ctrlDeleted {
+				// There are some deleted slots. Remember
+				// the first one, and keep probing.
+				if firstDeletedGroup.data == nil {
+					firstDeletedGroup = g
+					firstDeletedSlot = i
+				}
+				continue
+			}
+			// We've found an empty slot, which means we've reached the end of
+			// the probe sequence.
+
+			// If we found a deleted slot along the way, we can
+			// replace it without consuming growthLeft.
+			if firstDeletedGroup.data != nil {
+				g = firstDeletedGroup
+				i = firstDeletedSlot
+				t.growthLeft++ // will be decremented below to become a no-op.
+			}
+
+			// If there is room left to grow, just insert the new entry.
+			if t.growthLeft > 0 {
+				slotKey := g.key(typ, i)
+				*(*string)(slotKey) = key
+
+				slotElem = g.elem(typ, i)
+
+				g.ctrls().set(i, ctrl(h2(hash)))
+				t.growthLeft--
+				t.used++
+				m.used++
+
+				t.checkInvariants(typ, m)
+				break outer
+			}
+
+			t.rehash(typ, m)
+			continue outer
+		}
+	}
+
+	if m.writing == 0 {
+		fatal("concurrent map writes")
+	}
+	m.writing ^= 1
+
+	return slotElem
+}
+
+//go:linkname runtime_mapdelete_faststr runtime.mapdelete_faststr
+func runtime_mapdelete_faststr(typ *abi.SwissMapType, m *Map, key string) {
+	if race.Enabled {
+		callerpc := sys.GetCallerPC()
+		pc := abi.FuncPCABIInternal(runtime_mapassign)
+		race.WritePC(unsafe.Pointer(m), callerpc, pc)
+	}
+
+	if m == nil || m.Used() == 0 {
+		return
+	}
+
+	m.Delete(typ, abi.NoEscape(unsafe.Pointer(&key)))
+}
diff --git a/src/internal/runtime/maps/runtime_noswiss.go b/src/internal/runtime/maps/runtime_noswiss.go
new file mode 100644
index 00000000..c9342e08
--- /dev/null
+++ b/src/internal/runtime/maps/runtime_noswiss.go
@@ -0,0 +1,17 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build !goexperiment.swissmap
+
+package maps
+
+import (
+	"internal/abi"
+	"unsafe"
+)
+
+// For testing, we don't ever need key errors.
+func mapKeyError(typ *abi.SwissMapType, p unsafe.Pointer) error {
+	return nil
+}
diff --git a/src/internal/runtime/maps/runtime_swiss.go b/src/internal/runtime/maps/runtime_swiss.go
new file mode 100644
index 00000000..3f4f970f
--- /dev/null
+++ b/src/internal/runtime/maps/runtime_swiss.go
@@ -0,0 +1,355 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build goexperiment.swissmap
+
+package maps
+
+import (
+	"internal/abi"
+	"internal/asan"
+	"internal/msan"
+	"internal/race"
+	"internal/runtime/sys"
+	"unsafe"
+)
+
+// Functions below pushed from runtime.
+
+//go:linkname mapKeyError
+func mapKeyError(typ *abi.SwissMapType, p unsafe.Pointer) error
+
+// Pushed from runtime in order to use runtime.plainError
+//
+//go:linkname errNilAssign
+var errNilAssign error
+
+// Pull from runtime. It is important that is this the exact same copy as the
+// runtime because runtime.mapaccess1_fat compares the returned pointer with
+// &runtime.zeroVal[0].
+// TODO: move zeroVal to internal/abi?
+//
+//go:linkname zeroVal runtime.zeroVal
+var zeroVal [abi.ZeroValSize]byte
+
+// mapaccess1 returns a pointer to h[key].  Never returns nil, instead
+// it will return a reference to the zero object for the elem type if
+// the key is not in the map.
+// NOTE: The returned pointer may keep the whole map live, so don't
+// hold onto it for very long.
+//
+//go:linkname runtime_mapaccess1 runtime.mapaccess1
+func runtime_mapaccess1(typ *abi.SwissMapType, m *Map, key unsafe.Pointer) unsafe.Pointer {
+	if race.Enabled && m != nil {
+		callerpc := sys.GetCallerPC()
+		pc := abi.FuncPCABIInternal(runtime_mapaccess1)
+		race.ReadPC(unsafe.Pointer(m), callerpc, pc)
+		race.ReadObjectPC(typ.Key, key, callerpc, pc)
+	}
+	if msan.Enabled && m != nil {
+		msan.Read(key, typ.Key.Size_)
+	}
+	if asan.Enabled && m != nil {
+		asan.Read(key, typ.Key.Size_)
+	}
+
+	if m == nil || m.Used() == 0 {
+		if err := mapKeyError(typ, key); err != nil {
+			panic(err) // see issue 23734
+		}
+		return unsafe.Pointer(&zeroVal[0])
+	}
+
+	if m.writing != 0 {
+		fatal("concurrent map read and map write")
+	}
+
+	hash := typ.Hasher(key, m.seed)
+
+	if m.dirLen <= 0 {
+		_, elem, ok := m.getWithKeySmall(typ, hash, key)
+		if !ok {
+			return unsafe.Pointer(&zeroVal[0])
+		}
+		return elem
+	}
+
+	// Select table.
+	idx := m.directoryIndex(hash)
+	t := m.directoryAt(idx)
+
+	// Probe table.
+	seq := makeProbeSeq(h1(hash), t.groups.lengthMask)
+	for ; ; seq = seq.next() {
+		g := t.groups.group(typ, seq.offset)
+
+		match := g.ctrls().matchH2(h2(hash))
+
+		for match != 0 {
+			i := match.first()
+
+			slotKey := g.key(typ, i)
+			slotKeyOrig := slotKey
+			if typ.IndirectKey() {
+				slotKey = *((*unsafe.Pointer)(slotKey))
+			}
+			if typ.Key.Equal(key, slotKey) {
+				slotElem := unsafe.Pointer(uintptr(slotKeyOrig) + typ.ElemOff)
+				if typ.IndirectElem() {
+					slotElem = *((*unsafe.Pointer)(slotElem))
+				}
+				return slotElem
+			}
+			match = match.removeFirst()
+		}
+
+		match = g.ctrls().matchEmpty()
+		if match != 0 {
+			// Finding an empty slot means we've reached the end of
+			// the probe sequence.
+			return unsafe.Pointer(&zeroVal[0])
+		}
+	}
+}
+
+//go:linkname runtime_mapaccess2 runtime.mapaccess2
+func runtime_mapaccess2(typ *abi.SwissMapType, m *Map, key unsafe.Pointer) (unsafe.Pointer, bool) {
+	if race.Enabled && m != nil {
+		callerpc := sys.GetCallerPC()
+		pc := abi.FuncPCABIInternal(runtime_mapaccess1)
+		race.ReadPC(unsafe.Pointer(m), callerpc, pc)
+		race.ReadObjectPC(typ.Key, key, callerpc, pc)
+	}
+	if msan.Enabled && m != nil {
+		msan.Read(key, typ.Key.Size_)
+	}
+	if asan.Enabled && m != nil {
+		asan.Read(key, typ.Key.Size_)
+	}
+
+	if m == nil || m.Used() == 0 {
+		if err := mapKeyError(typ, key); err != nil {
+			panic(err) // see issue 23734
+		}
+		return unsafe.Pointer(&zeroVal[0]), false
+	}
+
+	if m.writing != 0 {
+		fatal("concurrent map read and map write")
+	}
+
+	hash := typ.Hasher(key, m.seed)
+
+	if m.dirLen == 0 {
+		_, elem, ok := m.getWithKeySmall(typ, hash, key)
+		if !ok {
+			return unsafe.Pointer(&zeroVal[0]), false
+		}
+		return elem, true
+	}
+
+	// Select table.
+	idx := m.directoryIndex(hash)
+	t := m.directoryAt(idx)
+
+	// Probe table.
+	seq := makeProbeSeq(h1(hash), t.groups.lengthMask)
+	for ; ; seq = seq.next() {
+		g := t.groups.group(typ, seq.offset)
+
+		match := g.ctrls().matchH2(h2(hash))
+
+		for match != 0 {
+			i := match.first()
+
+			slotKey := g.key(typ, i)
+			slotKeyOrig := slotKey
+			if typ.IndirectKey() {
+				slotKey = *((*unsafe.Pointer)(slotKey))
+			}
+			if typ.Key.Equal(key, slotKey) {
+				slotElem := unsafe.Pointer(uintptr(slotKeyOrig) + typ.ElemOff)
+				if typ.IndirectElem() {
+					slotElem = *((*unsafe.Pointer)(slotElem))
+				}
+				return slotElem, true
+			}
+			match = match.removeFirst()
+		}
+
+		match = g.ctrls().matchEmpty()
+		if match != 0 {
+			// Finding an empty slot means we've reached the end of
+			// the probe sequence.
+			return unsafe.Pointer(&zeroVal[0]), false
+		}
+	}
+}
+
+//go:linkname runtime_mapassign runtime.mapassign
+func runtime_mapassign(typ *abi.SwissMapType, m *Map, key unsafe.Pointer) unsafe.Pointer {
+	if m == nil {
+		panic(errNilAssign)
+	}
+	if race.Enabled {
+		callerpc := sys.GetCallerPC()
+		pc := abi.FuncPCABIInternal(runtime_mapassign)
+		race.WritePC(unsafe.Pointer(m), callerpc, pc)
+		race.ReadObjectPC(typ.Key, key, callerpc, pc)
+	}
+	if msan.Enabled {
+		msan.Read(key, typ.Key.Size_)
+	}
+	if asan.Enabled {
+		asan.Read(key, typ.Key.Size_)
+	}
+	if m.writing != 0 {
+		fatal("concurrent map writes")
+	}
+
+	hash := typ.Hasher(key, m.seed)
+
+	// Set writing after calling Hasher, since Hasher may panic, in which
+	// case we have not actually done a write.
+	m.writing ^= 1 // toggle, see comment on writing
+
+	if m.dirPtr == nil {
+		m.growToSmall(typ)
+	}
+
+	if m.dirLen == 0 {
+		if m.used < abi.SwissMapGroupSlots {
+			elem := m.putSlotSmall(typ, hash, key)
+
+			if m.writing == 0 {
+				fatal("concurrent map writes")
+			}
+			m.writing ^= 1
+
+			return elem
+		}
+
+		// Can't fit another entry, grow to full size map.
+		m.growToTable(typ)
+	}
+
+	var slotElem unsafe.Pointer
+outer:
+	for {
+		// Select table.
+		idx := m.directoryIndex(hash)
+		t := m.directoryAt(idx)
+
+		seq := makeProbeSeq(h1(hash), t.groups.lengthMask)
+
+		// As we look for a match, keep track of the first deleted slot
+		// we find, which we'll use to insert the new entry if
+		// necessary.
+		var firstDeletedGroup groupReference
+		var firstDeletedSlot uintptr
+
+		for ; ; seq = seq.next() {
+			g := t.groups.group(typ, seq.offset)
+			match := g.ctrls().matchH2(h2(hash))
+
+			// Look for an existing slot containing this key.
+			for match != 0 {
+				i := match.first()
+
+				slotKey := g.key(typ, i)
+				slotKeyOrig := slotKey
+				if typ.IndirectKey() {
+					slotKey = *((*unsafe.Pointer)(slotKey))
+				}
+				if typ.Key.Equal(key, slotKey) {
+					if typ.NeedKeyUpdate() {
+						typedmemmove(typ.Key, slotKey, key)
+					}
+
+					slotElem = unsafe.Pointer(uintptr(slotKeyOrig) + typ.ElemOff)
+					if typ.IndirectElem() {
+						slotElem = *((*unsafe.Pointer)(slotElem))
+					}
+
+					t.checkInvariants(typ, m)
+					break outer
+				}
+				match = match.removeFirst()
+			}
+
+			// No existing slot for this key in this group. Is this the end
+			// of the probe sequence?
+			match = g.ctrls().matchEmpty()
+			if match != 0 {
+				// Finding an empty slot means we've reached the end of
+				// the probe sequence.
+
+				var i uintptr
+
+				// If we found a deleted slot along the way, we
+				// can replace it without consuming growthLeft.
+				if firstDeletedGroup.data != nil {
+					g = firstDeletedGroup
+					i = firstDeletedSlot
+					t.growthLeft++ // will be decremented below to become a no-op.
+				} else {
+					// Otherwise, use the empty slot.
+					i = match.first()
+				}
+
+				// If there is room left to grow, just insert the new entry.
+				if t.growthLeft > 0 {
+					slotKey := g.key(typ, i)
+					slotKeyOrig := slotKey
+					if typ.IndirectKey() {
+						kmem := newobject(typ.Key)
+						*(*unsafe.Pointer)(slotKey) = kmem
+						slotKey = kmem
+					}
+					typedmemmove(typ.Key, slotKey, key)
+
+					slotElem = unsafe.Pointer(uintptr(slotKeyOrig) + typ.ElemOff)
+					if typ.IndirectElem() {
+						emem := newobject(typ.Elem)
+						*(*unsafe.Pointer)(slotElem) = emem
+						slotElem = emem
+					}
+
+					g.ctrls().set(i, ctrl(h2(hash)))
+					t.growthLeft--
+					t.used++
+					m.used++
+
+					t.checkInvariants(typ, m)
+					break outer
+				}
+
+				t.rehash(typ, m)
+				continue outer
+			}
+
+			// No empty slots in this group. Check for a deleted
+			// slot, which we'll use if we don't find a match later
+			// in the probe sequence.
+			//
+			// We only need to remember a single deleted slot.
+			if firstDeletedGroup.data == nil {
+				// Since we already checked for empty slots
+				// above, matches here must be deleted slots.
+				match = g.ctrls().matchEmptyOrDeleted()
+				if match != 0 {
+					firstDeletedGroup = g
+					firstDeletedSlot = match.first()
+				}
+			}
+		}
+	}
+
+	if m.writing == 0 {
+		fatal("concurrent map writes")
+	}
+	m.writing ^= 1
+
+	return slotElem
+}
diff --git a/src/internal/runtime/maps/table.go b/src/internal/runtime/maps/table.go
new file mode 100644
index 00000000..cc39c24a
--- /dev/null
+++ b/src/internal/runtime/maps/table.go
@@ -0,0 +1,1154 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package maps implements Go's builtin map type.
+package maps
+
+import (
+	"internal/abi"
+	"internal/goarch"
+	"unsafe"
+)
+
+// Maximum size of a table before it is split at the directory level.
+//
+// TODO: Completely made up value. This should be tuned for performance vs grow
+// latency.
+// TODO: This should likely be based on byte size, as copying costs will
+// dominate grow latency for large objects.
+const maxTableCapacity = 1024
+
+// Ensure the max capacity fits in uint16, used for capacity and growthLeft
+// below.
+var _ = uint16(maxTableCapacity)
+
+// table is a Swiss table hash table structure.
+//
+// Each table is a complete hash table implementation.
+//
+// Map uses one or more tables to store entries. Extendible hashing (hash
+// prefix) is used to select the table to use for a specific key. Using
+// multiple tables enables incremental growth by growing only one table at a
+// time.
+type table struct {
+	// The number of filled slots (i.e. the number of elements in the table).
+	used uint16
+
+	// The total number of slots (always 2^N). Equal to
+	// `(groups.lengthMask+1)*abi.SwissMapGroupSlots`.
+	capacity uint16
+
+	// The number of slots we can still fill without needing to rehash.
+	//
+	// We rehash when used + tombstones > loadFactor*capacity, including
+	// tombstones so the table doesn't overfill with tombstones. This field
+	// counts down remaining empty slots before the next rehash.
+	growthLeft uint16
+
+	// The number of bits used by directory lookups above this table. Note
+	// that this may be less then globalDepth, if the directory has grown
+	// but this table has not yet been split.
+	localDepth uint8
+
+	// Index of this table in the Map directory. This is the index of the
+	// _first_ location in the directory. The table may occur in multiple
+	// sequential indicies.
+	//
+	// index is -1 if the table is stale (no longer installed in the
+	// directory).
+	index int
+
+	// groups is an array of slot groups. Each group holds abi.SwissMapGroupSlots
+	// key/elem slots and their control bytes. A table has a fixed size
+	// groups array. The table is replaced (in rehash) when more space is
+	// required.
+	//
+	// TODO(prattmic): keys and elements are interleaved to maximize
+	// locality, but it comes at the expense of wasted space for some types
+	// (consider uint8 key, uint64 element). Consider placing all keys
+	// together in these cases to save space.
+	groups groupsReference
+}
+
+func newTable(typ *abi.SwissMapType, capacity uint64, index int, localDepth uint8) *table {
+	if capacity < abi.SwissMapGroupSlots {
+		capacity = abi.SwissMapGroupSlots
+	}
+
+	t := &table{
+		index:      index,
+		localDepth: localDepth,
+	}
+
+	if capacity > maxTableCapacity {
+		panic("initial table capacity too large")
+	}
+
+	// N.B. group count must be a power of two for probeSeq to visit every
+	// group.
+	capacity, overflow := alignUpPow2(capacity)
+	if overflow {
+		panic("rounded-up capacity overflows uint64")
+	}
+
+	t.reset(typ, uint16(capacity))
+
+	return t
+}
+
+// reset resets the table with new, empty groups with the specified new total
+// capacity.
+func (t *table) reset(typ *abi.SwissMapType, capacity uint16) {
+	groupCount := uint64(capacity) / abi.SwissMapGroupSlots
+	t.groups = newGroups(typ, groupCount)
+	t.capacity = capacity
+	t.resetGrowthLeft()
+
+	for i := uint64(0); i <= t.groups.lengthMask; i++ {
+		g := t.groups.group(typ, i)
+		g.ctrls().setEmpty()
+	}
+}
+
+// Preconditions: table must be empty.
+func (t *table) resetGrowthLeft() {
+	var growthLeft uint16
+	if t.capacity == 0 {
+		// No real reason to support zero capacity table, since an
+		// empty Map simply won't have a table.
+		panic("table must have positive capacity")
+	} else if t.capacity <= abi.SwissMapGroupSlots {
+		// If the map fits in a single group then we're able to fill all of
+		// the slots except 1 (an empty slot is needed to terminate find
+		// operations).
+		//
+		// TODO(go.dev/issue/54766): With a special case in probing for
+		// single-group tables, we could fill all slots.
+		growthLeft = t.capacity - 1
+	} else {
+		if t.capacity*maxAvgGroupLoad < t.capacity {
+			// TODO(prattmic): Do something cleaner.
+			panic("overflow")
+		}
+		growthLeft = (t.capacity * maxAvgGroupLoad) / abi.SwissMapGroupSlots
+	}
+	t.growthLeft = growthLeft
+}
+
+func (t *table) Used() uint64 {
+	return uint64(t.used)
+}
+
+// Get performs a lookup of the key that key points to. It returns a pointer to
+// the element, or false if the key doesn't exist.
+func (t *table) Get(typ *abi.SwissMapType, m *Map, key unsafe.Pointer) (unsafe.Pointer, bool) {
+	// TODO(prattmic): We could avoid hashing in a variety of special
+	// cases.
+	//
+	// - One entry maps could just directly compare the single entry
+	//   without hashing.
+	// - String keys could do quick checks of a few bytes before hashing.
+	hash := typ.Hasher(key, m.seed)
+	_, elem, ok := t.getWithKey(typ, hash, key)
+	return elem, ok
+}
+
+// getWithKey performs a lookup of key, returning a pointer to the version of
+// the key in the map in addition to the element.
+//
+// This is relevant when multiple different key values compare equal (e.g.,
+// +0.0 and -0.0). When a grow occurs during iteration, iteration perform a
+// lookup of keys from the old group in the new group in order to correctly
+// expose updated elements. For NeedsKeyUpdate keys, iteration also must return
+// the new key value, not the old key value.
+// hash must be the hash of the key.
+func (t *table) getWithKey(typ *abi.SwissMapType, hash uintptr, key unsafe.Pointer) (unsafe.Pointer, unsafe.Pointer, bool) {
+	// To find the location of a key in the table, we compute hash(key). From
+	// h1(hash(key)) and the capacity, we construct a probeSeq that visits
+	// every group of slots in some interesting order. See [probeSeq].
+	//
+	// We walk through these indices. At each index, we select the entire
+	// group starting with that index and extract potential candidates:
+	// occupied slots with a control byte equal to h2(hash(key)). The key
+	// at candidate slot i is compared with key; if key == g.slot(i).key
+	// we are done and return the slot; if there is an empty slot in the
+	// group, we stop and return an error; otherwise we continue to the
+	// next probe index. Tombstones (ctrlDeleted) effectively behave like
+	// full slots that never match the value we're looking for.
+	//
+	// The h2 bits ensure when we compare a key we are likely to have
+	// actually found the object. That is, the chance is low that keys
+	// compare false. Thus, when we search for an object, we are unlikely
+	// to call Equal many times. This likelihood can be analyzed as follows
+	// (assuming that h2 is a random enough hash function).
+	//
+	// Let's assume that there are k "wrong" objects that must be examined
+	// in a probe sequence. For example, when doing a find on an object
+	// that is in the table, k is the number of objects between the start
+	// of the probe sequence and the final found object (not including the
+	// final found object). The expected number of objects with an h2 match
+	// is then k/128. Measurements and analysis indicate that even at high
+	// load factors, k is less than 32, meaning that the number of false
+	// positive comparisons we must perform is less than 1/8 per find.
+	seq := makeProbeSeq(h1(hash), t.groups.lengthMask)
+	for ; ; seq = seq.next() {
+		g := t.groups.group(typ, seq.offset)
+
+		match := g.ctrls().matchH2(h2(hash))
+
+		for match != 0 {
+			i := match.first()
+
+			slotKey := g.key(typ, i)
+			if typ.IndirectKey() {
+				slotKey = *((*unsafe.Pointer)(slotKey))
+			}
+			if typ.Key.Equal(key, slotKey) {
+				slotElem := g.elem(typ, i)
+				if typ.IndirectElem() {
+					slotElem = *((*unsafe.Pointer)(slotElem))
+				}
+				return slotKey, slotElem, true
+			}
+			match = match.removeFirst()
+		}
+
+		match = g.ctrls().matchEmpty()
+		if match != 0 {
+			// Finding an empty slot means we've reached the end of
+			// the probe sequence.
+			return nil, nil, false
+		}
+	}
+}
+
+func (t *table) getWithoutKey(typ *abi.SwissMapType, hash uintptr, key unsafe.Pointer) (unsafe.Pointer, bool) {
+	seq := makeProbeSeq(h1(hash), t.groups.lengthMask)
+	for ; ; seq = seq.next() {
+		g := t.groups.group(typ, seq.offset)
+
+		match := g.ctrls().matchH2(h2(hash))
+
+		for match != 0 {
+			i := match.first()
+
+			slotKey := g.key(typ, i)
+			if typ.IndirectKey() {
+				slotKey = *((*unsafe.Pointer)(slotKey))
+			}
+			if typ.Key.Equal(key, slotKey) {
+				slotElem := g.elem(typ, i)
+				if typ.IndirectElem() {
+					slotElem = *((*unsafe.Pointer)(slotElem))
+				}
+				return slotElem, true
+			}
+			match = match.removeFirst()
+		}
+
+		match = g.ctrls().matchEmpty()
+		if match != 0 {
+			// Finding an empty slot means we've reached the end of
+			// the probe sequence.
+			return nil, false
+		}
+	}
+}
+
+// PutSlot returns a pointer to the element slot where an inserted element
+// should be written, and ok if it returned a valid slot.
+//
+// PutSlot returns ok false if the table was split and the Map needs to find
+// the new table.
+//
+// hash must be the hash of key.
+func (t *table) PutSlot(typ *abi.SwissMapType, m *Map, hash uintptr, key unsafe.Pointer) (unsafe.Pointer, bool) {
+	seq := makeProbeSeq(h1(hash), t.groups.lengthMask)
+
+	// As we look for a match, keep track of the first deleted slot we
+	// find, which we'll use to insert the new entry if necessary.
+	var firstDeletedGroup groupReference
+	var firstDeletedSlot uintptr
+
+	for ; ; seq = seq.next() {
+		g := t.groups.group(typ, seq.offset)
+		match := g.ctrls().matchH2(h2(hash))
+
+		// Look for an existing slot containing this key.
+		for match != 0 {
+			i := match.first()
+
+			slotKey := g.key(typ, i)
+			if typ.IndirectKey() {
+				slotKey = *((*unsafe.Pointer)(slotKey))
+			}
+			if typ.Key.Equal(key, slotKey) {
+				if typ.NeedKeyUpdate() {
+					typedmemmove(typ.Key, slotKey, key)
+				}
+
+				slotElem := g.elem(typ, i)
+				if typ.IndirectElem() {
+					slotElem = *((*unsafe.Pointer)(slotElem))
+				}
+
+				t.checkInvariants(typ, m)
+				return slotElem, true
+			}
+			match = match.removeFirst()
+		}
+
+		// No existing slot for this key in this group. Is this the end
+		// of the probe sequence?
+		match = g.ctrls().matchEmptyOrDeleted()
+		if match == 0 {
+			continue // nothing but filled slots. Keep probing.
+		}
+		i := match.first()
+		if g.ctrls().get(i) == ctrlDeleted {
+			// There are some deleted slots. Remember
+			// the first one, and keep probing.
+			if firstDeletedGroup.data == nil {
+				firstDeletedGroup = g
+				firstDeletedSlot = i
+			}
+			continue
+		}
+		// We've found an empty slot, which means we've reached the end of
+		// the probe sequence.
+
+		// If we found a deleted slot along the way, we can
+		// replace it without consuming growthLeft.
+		if firstDeletedGroup.data != nil {
+			g = firstDeletedGroup
+			i = firstDeletedSlot
+			t.growthLeft++ // will be decremented below to become a no-op.
+		}
+
+		// If there is room left to grow, just insert the new entry.
+		if t.growthLeft > 0 {
+			slotKey := g.key(typ, i)
+			if typ.IndirectKey() {
+				kmem := newobject(typ.Key)
+				*(*unsafe.Pointer)(slotKey) = kmem
+				slotKey = kmem
+			}
+			typedmemmove(typ.Key, slotKey, key)
+
+			slotElem := g.elem(typ, i)
+			if typ.IndirectElem() {
+				emem := newobject(typ.Elem)
+				*(*unsafe.Pointer)(slotElem) = emem
+				slotElem = emem
+			}
+
+			g.ctrls().set(i, ctrl(h2(hash)))
+			t.growthLeft--
+			t.used++
+			m.used++
+
+			t.checkInvariants(typ, m)
+			return slotElem, true
+		}
+
+		t.rehash(typ, m)
+		return nil, false
+	}
+}
+
+// uncheckedPutSlot inserts an entry known not to be in the table.
+// This is used for grow/split where we are making a new table from
+// entries in an existing table.
+//
+// Decrements growthLeft and increments used.
+//
+// Requires that the entry does not exist in the table, and that the table has
+// room for another element without rehashing.
+//
+// Requires that there are no deleted entries in the table.
+//
+// For indirect keys and/or elements, the key and elem pointers can be
+// put directly into the map, they do not need to be copied. This
+// requires the caller to ensure that the referenced memory never
+// changes (by sourcing those pointers from another indirect key/elem
+// map).
+func (t *table) uncheckedPutSlot(typ *abi.SwissMapType, hash uintptr, key, elem unsafe.Pointer) {
+	if t.growthLeft == 0 {
+		panic("invariant failed: growthLeft is unexpectedly 0")
+	}
+
+	// Given key and its hash hash(key), to insert it, we construct a
+	// probeSeq, and use it to find the first group with an unoccupied (empty
+	// or deleted) slot. We place the key/value into the first such slot in
+	// the group and mark it as full with key's H2.
+	seq := makeProbeSeq(h1(hash), t.groups.lengthMask)
+	for ; ; seq = seq.next() {
+		g := t.groups.group(typ, seq.offset)
+
+		match := g.ctrls().matchEmptyOrDeleted()
+		if match != 0 {
+			i := match.first()
+
+			slotKey := g.key(typ, i)
+			if typ.IndirectKey() {
+				*(*unsafe.Pointer)(slotKey) = key
+			} else {
+				typedmemmove(typ.Key, slotKey, key)
+			}
+
+			slotElem := g.elem(typ, i)
+			if typ.IndirectElem() {
+				*(*unsafe.Pointer)(slotElem) = elem
+			} else {
+				typedmemmove(typ.Elem, slotElem, elem)
+			}
+
+			t.growthLeft--
+			t.used++
+			g.ctrls().set(i, ctrl(h2(hash)))
+			return
+		}
+	}
+}
+
+func (t *table) Delete(typ *abi.SwissMapType, m *Map, hash uintptr, key unsafe.Pointer) {
+	seq := makeProbeSeq(h1(hash), t.groups.lengthMask)
+	for ; ; seq = seq.next() {
+		g := t.groups.group(typ, seq.offset)
+		match := g.ctrls().matchH2(h2(hash))
+
+		for match != 0 {
+			i := match.first()
+
+			slotKey := g.key(typ, i)
+			origSlotKey := slotKey
+			if typ.IndirectKey() {
+				slotKey = *((*unsafe.Pointer)(slotKey))
+			}
+
+			if typ.Key.Equal(key, slotKey) {
+				t.used--
+				m.used--
+
+				if typ.IndirectKey() {
+					// Clearing the pointer is sufficient.
+					*(*unsafe.Pointer)(origSlotKey) = nil
+				} else if typ.Key.Pointers() {
+					// Only bothing clear the key if there
+					// are pointers in it.
+					typedmemclr(typ.Key, slotKey)
+				}
+
+				slotElem := g.elem(typ, i)
+				if typ.IndirectElem() {
+					// Clearing the pointer is sufficient.
+					*(*unsafe.Pointer)(slotElem) = nil
+				} else {
+					// Unlike keys, always clear the elem (even if
+					// it contains no pointers), as compound
+					// assignment operations depend on cleared
+					// deleted values. See
+					// https://go.dev/issue/25936.
+					typedmemclr(typ.Elem, slotElem)
+				}
+
+				// Only a full group can appear in the middle
+				// of a probe sequence (a group with at least
+				// one empty slot terminates probing). Once a
+				// group becomes full, it stays full until
+				// rehashing/resizing. So if the group isn't
+				// full now, we can simply remove the element.
+				// Otherwise, we create a tombstone to mark the
+				// slot as deleted.
+				if g.ctrls().matchEmpty() != 0 {
+					g.ctrls().set(i, ctrlEmpty)
+					t.growthLeft++
+				} else {
+					g.ctrls().set(i, ctrlDeleted)
+				}
+
+				t.checkInvariants(typ, m)
+				return
+			}
+			match = match.removeFirst()
+		}
+
+		match = g.ctrls().matchEmpty()
+		if match != 0 {
+			// Finding an empty slot means we've reached the end of
+			// the probe sequence.
+			return
+		}
+	}
+}
+
+// tombstones returns the number of deleted (tombstone) entries in the table. A
+// tombstone is a slot that has been deleted but is still considered occupied
+// so as not to violate the probing invariant.
+func (t *table) tombstones() uint16 {
+	return (t.capacity*maxAvgGroupLoad)/abi.SwissMapGroupSlots - t.used - t.growthLeft
+}
+
+// Clear deletes all entries from the map resulting in an empty map.
+func (t *table) Clear(typ *abi.SwissMapType) {
+	for i := uint64(0); i <= t.groups.lengthMask; i++ {
+		g := t.groups.group(typ, i)
+		typedmemclr(typ.Group, g.data)
+		g.ctrls().setEmpty()
+	}
+
+	t.used = 0
+	t.resetGrowthLeft()
+}
+
+type Iter struct {
+	key  unsafe.Pointer // Must be in first position.  Write nil to indicate iteration end (see cmd/compile/internal/walk/range.go).
+	elem unsafe.Pointer // Must be in second position (see cmd/compile/internal/walk/range.go).
+	typ  *abi.SwissMapType
+	m    *Map
+
+	// Randomize iteration order by starting iteration at a random slot
+	// offset. The offset into the directory uses a separate offset, as it
+	// must adjust when the directory grows.
+	entryOffset uint64
+	dirOffset   uint64
+
+	// Snapshot of Map.clearSeq at iteration initialization time. Used to
+	// detect clear during iteration.
+	clearSeq uint64
+
+	// Value of Map.globalDepth during the last call to Next. Used to
+	// detect directory grow during iteration.
+	globalDepth uint8
+
+	// dirIdx is the current directory index, prior to adjustment by
+	// dirOffset.
+	dirIdx int
+
+	// tab is the table at dirIdx during the previous call to Next.
+	tab *table
+
+	// group is the group at entryIdx during the previous call to Next.
+	group groupReference
+
+	// entryIdx is the current entry index, prior to adjustment by entryOffset.
+	// The lower 3 bits of the index are the slot index, and the upper bits
+	// are the group index.
+	entryIdx uint64
+}
+
+// Init initializes Iter for iteration.
+func (it *Iter) Init(typ *abi.SwissMapType, m *Map) {
+	it.typ = typ
+
+	if m == nil || m.used == 0 {
+		return
+	}
+
+	dirIdx := 0
+	var groupSmall groupReference
+	if m.dirLen <= 0 {
+		// Use dirIdx == -1 as sentinel for small maps.
+		dirIdx = -1
+		groupSmall.data = m.dirPtr
+	}
+
+	it.m = m
+	it.entryOffset = rand()
+	it.dirOffset = rand()
+	it.globalDepth = m.globalDepth
+	it.dirIdx = dirIdx
+	it.group = groupSmall
+	it.clearSeq = m.clearSeq
+}
+
+func (it *Iter) Initialized() bool {
+	return it.typ != nil
+}
+
+// Map returns the map this iterator is iterating over.
+func (it *Iter) Map() *Map {
+	return it.m
+}
+
+// Key returns a pointer to the current key. nil indicates end of iteration.
+//
+// Must not be called prior to Next.
+func (it *Iter) Key() unsafe.Pointer {
+	return it.key
+}
+
+// Key returns a pointer to the current element. nil indicates end of
+// iteration.
+//
+// Must not be called prior to Next.
+func (it *Iter) Elem() unsafe.Pointer {
+	return it.elem
+}
+
+func (it *Iter) nextDirIdx() {
+	// Skip other entries in the directory that refer to the same
+	// logical table. There are two cases of this:
+	//
+	// Consider this directory:
+	//
+	// - 0: *t1
+	// - 1: *t1
+	// - 2: *t2a
+	// - 3: *t2b
+	//
+	// At some point, the directory grew to accommodate a split of
+	// t2. t1 did not split, so entries 0 and 1 both point to t1.
+	// t2 did split, so the two halves were installed in entries 2
+	// and 3.
+	//
+	// If dirIdx is 0 and it.tab is t1, then we should skip past
+	// entry 1 to avoid repeating t1.
+	//
+	// If dirIdx is 2 and it.tab is t2 (pre-split), then we should
+	// skip past entry 3 because our pre-split t2 already covers
+	// all keys from t2a and t2b (except for new insertions, which
+	// iteration need not return).
+	//
+	// We can achieve both of these by using to difference between
+	// the directory and table depth to compute how many entries
+	// the table covers.
+	entries := 1 << (it.m.globalDepth - it.tab.localDepth)
+	it.dirIdx += entries
+	it.tab = nil
+	it.group = groupReference{}
+	it.entryIdx = 0
+}
+
+// Return the appropriate key/elem for key at slotIdx index within it.group, if
+// any.
+func (it *Iter) grownKeyElem(key unsafe.Pointer, slotIdx uintptr) (unsafe.Pointer, unsafe.Pointer, bool) {
+	newKey, newElem, ok := it.m.getWithKey(it.typ, key)
+	if !ok {
+		// Key has likely been deleted, and
+		// should be skipped.
+		//
+		// One exception is keys that don't
+		// compare equal to themselves (e.g.,
+		// NaN). These keys cannot be looked
+		// up, so getWithKey will fail even if
+		// the key exists.
+		//
+		// However, we are in luck because such
+		// keys cannot be updated and they
+		// cannot be deleted except with clear.
+		// Thus if no clear has occurred, the
+		// key/elem must still exist exactly as
+		// in the old groups, so we can return
+		// them from there.
+		//
+		// TODO(prattmic): Consider checking
+		// clearSeq early. If a clear occurred,
+		// Next could always return
+		// immediately, as iteration doesn't
+		// need to return anything added after
+		// clear.
+		if it.clearSeq == it.m.clearSeq && !it.typ.Key.Equal(key, key) {
+			elem := it.group.elem(it.typ, slotIdx)
+			if it.typ.IndirectElem() {
+				elem = *((*unsafe.Pointer)(elem))
+			}
+			return key, elem, true
+		}
+
+		// This entry doesn't exist anymore.
+		return nil, nil, false
+	}
+
+	return newKey, newElem, true
+}
+
+// Next proceeds to the next element in iteration, which can be accessed via
+// the Key and Elem methods.
+//
+// The table can be mutated during iteration, though there is no guarantee that
+// the mutations will be visible to the iteration.
+//
+// Init must be called prior to Next.
+func (it *Iter) Next() {
+	if it.m == nil {
+		// Map was empty at Iter.Init.
+		it.key = nil
+		it.elem = nil
+		return
+	}
+
+	if it.m.writing != 0 {
+		fatal("concurrent map iteration and map write")
+		return
+	}
+
+	if it.dirIdx < 0 {
+		// Map was small at Init.
+		for ; it.entryIdx < abi.SwissMapGroupSlots; it.entryIdx++ {
+			k := uintptr(it.entryIdx+it.entryOffset) % abi.SwissMapGroupSlots
+
+			if (it.group.ctrls().get(k) & ctrlEmpty) == ctrlEmpty {
+				// Empty or deleted.
+				continue
+			}
+
+			key := it.group.key(it.typ, k)
+			if it.typ.IndirectKey() {
+				key = *((*unsafe.Pointer)(key))
+			}
+
+			// As below, if we have grown to a full map since Init,
+			// we continue to use the old group to decide the keys
+			// to return, but must look them up again in the new
+			// tables.
+			grown := it.m.dirLen > 0
+			var elem unsafe.Pointer
+			if grown {
+				var ok bool
+				newKey, newElem, ok := it.m.getWithKey(it.typ, key)
+				if !ok {
+					// See comment below.
+					if it.clearSeq == it.m.clearSeq && !it.typ.Key.Equal(key, key) {
+						elem = it.group.elem(it.typ, k)
+						if it.typ.IndirectElem() {
+							elem = *((*unsafe.Pointer)(elem))
+						}
+					} else {
+						continue
+					}
+				} else {
+					key = newKey
+					elem = newElem
+				}
+			} else {
+				elem = it.group.elem(it.typ, k)
+				if it.typ.IndirectElem() {
+					elem = *((*unsafe.Pointer)(elem))
+				}
+			}
+
+			it.entryIdx++
+			it.key = key
+			it.elem = elem
+			return
+		}
+		it.key = nil
+		it.elem = nil
+		return
+	}
+
+	if it.globalDepth != it.m.globalDepth {
+		// Directory has grown since the last call to Next. Adjust our
+		// directory index.
+		//
+		// Consider:
+		//
+		// Before:
+		// - 0: *t1
+		// - 1: *t2  <- dirIdx
+		//
+		// After:
+		// - 0: *t1a (split)
+		// - 1: *t1b (split)
+		// - 2: *t2  <- dirIdx
+		// - 3: *t2
+		//
+		// That is, we want to double the current index when the
+		// directory size doubles (or quadruple when the directory size
+		// quadruples, etc).
+		//
+		// The actual (randomized) dirIdx is computed below as:
+		//
+		// dirIdx := (it.dirIdx + it.dirOffset) % it.m.dirLen
+		//
+		// Multiplication is associative across modulo operations,
+		// A * (B % C) = (A * B) % (A * C),
+		// provided that A is positive.
+		//
+		// Thus we can achieve this by adjusting it.dirIdx,
+		// it.dirOffset, and it.m.dirLen individually.
+		orders := it.m.globalDepth - it.globalDepth
+		it.dirIdx <<= orders
+		it.dirOffset <<= orders
+		// it.m.dirLen was already adjusted when the directory grew.
+
+		it.globalDepth = it.m.globalDepth
+	}
+
+	// Continue iteration until we find a full slot.
+	for ; it.dirIdx < it.m.dirLen; it.nextDirIdx() {
+		// Resolve the table.
+		if it.tab == nil {
+			dirIdx := int((uint64(it.dirIdx) + it.dirOffset) & uint64(it.m.dirLen-1))
+			newTab := it.m.directoryAt(uintptr(dirIdx))
+			if newTab.index != dirIdx {
+				// Normally we skip past all duplicates of the
+				// same entry in the table (see updates to
+				// it.dirIdx at the end of the loop below), so
+				// this case wouldn't occur.
+				//
+				// But on the very first call, we have a
+				// completely randomized dirIdx that may refer
+				// to a middle of a run of tables in the
+				// directory. Do a one-time adjustment of the
+				// offset to ensure we start at first index for
+				// newTable.
+				diff := dirIdx - newTab.index
+				it.dirOffset -= uint64(diff)
+				dirIdx = newTab.index
+			}
+			it.tab = newTab
+		}
+
+		// N.B. Use it.tab, not newTab. It is important to use the old
+		// table for key selection if the table has grown. See comment
+		// on grown below.
+
+		entryMask := uint64(it.tab.capacity) - 1
+		if it.entryIdx > entryMask {
+			// Continue to next table.
+			continue
+		}
+
+		// Fast path: skip matching and directly check if entryIdx is a
+		// full slot.
+		//
+		// In the slow path below, we perform an 8-slot match check to
+		// look for full slots within the group.
+		//
+		// However, with a max load factor of 7/8, each slot in a
+		// mostly full map has a high probability of being full. Thus
+		// it is cheaper to check a single slot than do a full control
+		// match.
+
+		entryIdx := (it.entryIdx + it.entryOffset) & entryMask
+		slotIdx := uintptr(entryIdx & (abi.SwissMapGroupSlots - 1))
+		if slotIdx == 0 || it.group.data == nil {
+			// Only compute the group (a) when we switch
+			// groups (slotIdx rolls over) and (b) on the
+			// first iteration in this table (slotIdx may
+			// not be zero due to entryOffset).
+			groupIdx := entryIdx >> abi.SwissMapGroupSlotsBits
+			it.group = it.tab.groups.group(it.typ, groupIdx)
+		}
+
+		if (it.group.ctrls().get(slotIdx) & ctrlEmpty) == 0 {
+			// Slot full.
+
+			key := it.group.key(it.typ, slotIdx)
+			if it.typ.IndirectKey() {
+				key = *((*unsafe.Pointer)(key))
+			}
+
+			grown := it.tab.index == -1
+			var elem unsafe.Pointer
+			if grown {
+				newKey, newElem, ok := it.grownKeyElem(key, slotIdx)
+				if !ok {
+					// This entry doesn't exist
+					// anymore. Continue to the
+					// next one.
+					goto next
+				} else {
+					key = newKey
+					elem = newElem
+				}
+			} else {
+				elem = it.group.elem(it.typ, slotIdx)
+				if it.typ.IndirectElem() {
+					elem = *((*unsafe.Pointer)(elem))
+				}
+			}
+
+			it.entryIdx++
+			it.key = key
+			it.elem = elem
+			return
+		}
+
+	next:
+		it.entryIdx++
+
+		// Slow path: use a match on the control word to jump ahead to
+		// the next full slot.
+		//
+		// This is highly effective for maps with particularly low load
+		// (e.g., map allocated with large hint but few insertions).
+		//
+		// For maps with medium load (e.g., 3-4 empty slots per group)
+		// it also tends to work pretty well. Since slots within a
+		// group are filled in order, then if there have been no
+		// deletions, a match will allow skipping past all empty slots
+		// at once.
+		//
+		// Note: it is tempting to cache the group match result in the
+		// iterator to use across Next calls. However because entries
+		// may be deleted between calls later calls would still need to
+		// double-check the control value.
+
+		var groupMatch bitset
+		for it.entryIdx <= entryMask {
+			entryIdx := (it.entryIdx + it.entryOffset) & entryMask
+			slotIdx := uintptr(entryIdx & (abi.SwissMapGroupSlots - 1))
+
+			if slotIdx == 0 || it.group.data == nil {
+				// Only compute the group (a) when we switch
+				// groups (slotIdx rolls over) and (b) on the
+				// first iteration in this table (slotIdx may
+				// not be zero due to entryOffset).
+				groupIdx := entryIdx >> abi.SwissMapGroupSlotsBits
+				it.group = it.tab.groups.group(it.typ, groupIdx)
+			}
+
+			if groupMatch == 0 {
+				groupMatch = it.group.ctrls().matchFull()
+
+				if slotIdx != 0 {
+					// Starting in the middle of the group.
+					// Ignore earlier groups.
+					groupMatch = groupMatch.removeBelow(slotIdx)
+				}
+
+				// Skip over groups that are composed of only empty or
+				// deleted slots.
+				if groupMatch == 0 {
+					// Jump past remaining slots in this
+					// group.
+					it.entryIdx += abi.SwissMapGroupSlots - uint64(slotIdx)
+					continue
+				}
+
+				i := groupMatch.first()
+				it.entryIdx += uint64(i - slotIdx)
+				if it.entryIdx > entryMask {
+					// Past the end of this table's iteration.
+					continue
+				}
+				entryIdx += uint64(i - slotIdx)
+				slotIdx = i
+			}
+
+			key := it.group.key(it.typ, slotIdx)
+			if it.typ.IndirectKey() {
+				key = *((*unsafe.Pointer)(key))
+			}
+
+			// If the table has changed since the last
+			// call, then it has grown or split. In this
+			// case, further mutations (changes to
+			// key->elem or deletions) will not be visible
+			// in our snapshot table. Instead we must
+			// consult the new table by doing a full
+			// lookup.
+			//
+			// We still use our old table to decide which
+			// keys to lookup in order to avoid returning
+			// the same key twice.
+			grown := it.tab.index == -1
+			var elem unsafe.Pointer
+			if grown {
+				newKey, newElem, ok := it.grownKeyElem(key, slotIdx)
+				if !ok {
+					// This entry doesn't exist anymore.
+					// Continue to the next one.
+					groupMatch = groupMatch.removeFirst()
+					if groupMatch == 0 {
+						// No more entries in this
+						// group. Continue to next
+						// group.
+						it.entryIdx += abi.SwissMapGroupSlots - uint64(slotIdx)
+						continue
+					}
+
+					// Next full slot.
+					i := groupMatch.first()
+					it.entryIdx += uint64(i - slotIdx)
+					continue
+				} else {
+					key = newKey
+					elem = newElem
+				}
+			} else {
+				elem = it.group.elem(it.typ, slotIdx)
+				if it.typ.IndirectElem() {
+					elem = *((*unsafe.Pointer)(elem))
+				}
+			}
+
+			// Jump ahead to the next full slot or next group.
+			groupMatch = groupMatch.removeFirst()
+			if groupMatch == 0 {
+				// No more entries in
+				// this group. Continue
+				// to next group.
+				it.entryIdx += abi.SwissMapGroupSlots - uint64(slotIdx)
+			} else {
+				// Next full slot.
+				i := groupMatch.first()
+				it.entryIdx += uint64(i - slotIdx)
+			}
+
+			it.key = key
+			it.elem = elem
+			return
+		}
+
+		// Continue to next table.
+	}
+
+	it.key = nil
+	it.elem = nil
+	return
+}
+
+// Replaces the table with one larger table or two split tables to fit more
+// entries. Since the table is replaced, t is now stale and should not be
+// modified.
+func (t *table) rehash(typ *abi.SwissMapType, m *Map) {
+	// TODO(prattmic): SwissTables typically perform a "rehash in place"
+	// operation which recovers capacity consumed by tombstones without growing
+	// the table by reordering slots as necessary to maintain the probe
+	// invariant while eliminating all tombstones.
+	//
+	// However, it is unclear how to make rehash in place work with
+	// iteration. Since iteration simply walks through all slots in order
+	// (with random start offset), reordering the slots would break
+	// iteration.
+	//
+	// As an alternative, we could do a "resize" to new groups allocation
+	// of the same size. This would eliminate the tombstones, but using a
+	// new allocation, so the existing grow support in iteration would
+	// continue to work.
+
+	newCapacity := 2 * t.capacity
+	if newCapacity <= maxTableCapacity {
+		t.grow(typ, m, newCapacity)
+		return
+	}
+
+	t.split(typ, m)
+}
+
+// Bitmask for the last selection bit at this depth.
+func localDepthMask(localDepth uint8) uintptr {
+	if goarch.PtrSize == 4 {
+		return uintptr(1) << (32 - localDepth)
+	}
+	return uintptr(1) << (64 - localDepth)
+}
+
+// split the table into two, installing the new tables in the map directory.
+func (t *table) split(typ *abi.SwissMapType, m *Map) {
+	localDepth := t.localDepth
+	localDepth++
+
+	// TODO: is this the best capacity?
+	left := newTable(typ, maxTableCapacity, -1, localDepth)
+	right := newTable(typ, maxTableCapacity, -1, localDepth)
+
+	// Split in half at the localDepth bit from the top.
+	mask := localDepthMask(localDepth)
+
+	for i := uint64(0); i <= t.groups.lengthMask; i++ {
+		g := t.groups.group(typ, i)
+		for j := uintptr(0); j < abi.SwissMapGroupSlots; j++ {
+			if (g.ctrls().get(j) & ctrlEmpty) == ctrlEmpty {
+				// Empty or deleted
+				continue
+			}
+
+			key := g.key(typ, j)
+			if typ.IndirectKey() {
+				key = *((*unsafe.Pointer)(key))
+			}
+
+			elem := g.elem(typ, j)
+			if typ.IndirectElem() {
+				elem = *((*unsafe.Pointer)(elem))
+			}
+
+			hash := typ.Hasher(key, m.seed)
+			var newTable *table
+			if hash&mask == 0 {
+				newTable = left
+			} else {
+				newTable = right
+			}
+			newTable.uncheckedPutSlot(typ, hash, key, elem)
+		}
+	}
+
+	m.installTableSplit(t, left, right)
+	t.index = -1
+}
+
+// grow the capacity of the table by allocating a new table with a bigger array
+// and uncheckedPutting each element of the table into the new table (we know
+// that no insertion here will Put an already-present value), and discard the
+// old table.
+func (t *table) grow(typ *abi.SwissMapType, m *Map, newCapacity uint16) {
+	newTable := newTable(typ, uint64(newCapacity), t.index, t.localDepth)
+
+	if t.capacity > 0 {
+		for i := uint64(0); i <= t.groups.lengthMask; i++ {
+			g := t.groups.group(typ, i)
+			for j := uintptr(0); j < abi.SwissMapGroupSlots; j++ {
+				if (g.ctrls().get(j) & ctrlEmpty) == ctrlEmpty {
+					// Empty or deleted
+					continue
+				}
+
+				key := g.key(typ, j)
+				if typ.IndirectKey() {
+					key = *((*unsafe.Pointer)(key))
+				}
+
+				elem := g.elem(typ, j)
+				if typ.IndirectElem() {
+					elem = *((*unsafe.Pointer)(elem))
+				}
+
+				hash := typ.Hasher(key, m.seed)
+
+				newTable.uncheckedPutSlot(typ, hash, key, elem)
+			}
+		}
+	}
+
+	newTable.checkInvariants(typ, m)
+	m.replaceTable(newTable)
+	t.index = -1
+}
+
+// probeSeq maintains the state for a probe sequence that iterates through the
+// groups in a table. The sequence is a triangular progression of the form
+//
+//	p(i) := (i^2 + i)/2 + hash (mod mask+1)
+//
+// The sequence effectively outputs the indexes of *groups*. The group
+// machinery allows us to check an entire group with minimal branching.
+//
+// It turns out that this probe sequence visits every group exactly once if
+// the number of groups is a power of two, since (i^2+i)/2 is a bijection in
+// Z/(2^m). See https://en.wikipedia.org/wiki/Quadratic_probing
+type probeSeq struct {
+	mask   uint64
+	offset uint64
+	index  uint64
+}
+
+func makeProbeSeq(hash uintptr, mask uint64) probeSeq {
+	return probeSeq{
+		mask:   mask,
+		offset: uint64(hash) & mask,
+		index:  0,
+	}
+}
+
+func (s probeSeq) next() probeSeq {
+	s.index++
+	s.offset = (s.offset + s.index) & s.mask
+	return s
+}
diff --git a/src/internal/runtime/maps/table_debug.go b/src/internal/runtime/maps/table_debug.go
new file mode 100644
index 00000000..a754592f
--- /dev/null
+++ b/src/internal/runtime/maps/table_debug.go
@@ -0,0 +1,131 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package maps implements Go's builtin map type.
+package maps
+
+import (
+	"internal/abi"
+	"unsafe"
+)
+
+const debugLog = false
+
+func (t *table) checkInvariants(typ *abi.SwissMapType, m *Map) {
+	if !debugLog {
+		return
+	}
+
+	// For every non-empty slot, verify we can retrieve the key using Get.
+	// Count the number of used and deleted slots.
+	var used uint16
+	var deleted uint16
+	var empty uint16
+	for i := uint64(0); i <= t.groups.lengthMask; i++ {
+		g := t.groups.group(typ, i)
+		for j := uintptr(0); j < abi.SwissMapGroupSlots; j++ {
+			c := g.ctrls().get(j)
+			switch {
+			case c == ctrlDeleted:
+				deleted++
+			case c == ctrlEmpty:
+				empty++
+			default:
+				used++
+
+				key := g.key(typ, j)
+				if typ.IndirectKey() {
+					key = *((*unsafe.Pointer)(key))
+				}
+
+				// Can't lookup keys that don't compare equal
+				// to themselves (e.g., NaN).
+				if !typ.Key.Equal(key, key) {
+					continue
+				}
+
+				if _, ok := t.Get(typ, m, key); !ok {
+					hash := typ.Hasher(key, m.seed)
+					print("invariant failed: slot(", i, "/", j, "): key ")
+					dump(key, typ.Key.Size_)
+					print(" not found [hash=", hash, ", h2=", h2(hash), " h1=", h1(hash), "]\n")
+					t.Print(typ, m)
+					panic("invariant failed: slot: key not found")
+				}
+			}
+		}
+	}
+
+	if used != t.used {
+		print("invariant failed: found ", used, " used slots, but used count is ", t.used, "\n")
+		t.Print(typ, m)
+		panic("invariant failed: found mismatched used slot count")
+	}
+
+	growthLeft := (t.capacity*maxAvgGroupLoad)/abi.SwissMapGroupSlots - t.used - deleted
+	if growthLeft != t.growthLeft {
+		print("invariant failed: found ", t.growthLeft, " growthLeft, but expected ", growthLeft, "\n")
+		t.Print(typ, m)
+		panic("invariant failed: found mismatched growthLeft")
+	}
+	if deleted != t.tombstones() {
+		print("invariant failed: found ", deleted, " tombstones, but expected ", t.tombstones(), "\n")
+		t.Print(typ, m)
+		panic("invariant failed: found mismatched tombstones")
+	}
+
+	if empty == 0 {
+		print("invariant failed: found no empty slots (violates probe invariant)\n")
+		t.Print(typ, m)
+		panic("invariant failed: found no empty slots (violates probe invariant)")
+	}
+}
+func (t *table) Print(typ *abi.SwissMapType, m *Map) {
+	print(`table{
+	index: `, t.index, `
+	localDepth: `, t.localDepth, `
+	capacity: `, t.capacity, `
+	used: `, t.used, `
+	growthLeft: `, t.growthLeft, `
+	groups:
+`)
+
+	for i := uint64(0); i <= t.groups.lengthMask; i++ {
+		print("\t\tgroup ", i, "\n")
+
+		g := t.groups.group(typ, i)
+		ctrls := g.ctrls()
+		for j := uintptr(0); j < abi.SwissMapGroupSlots; j++ {
+			print("\t\t\tslot ", j, "\n")
+
+			c := ctrls.get(j)
+			print("\t\t\t\tctrl ", c)
+			switch c {
+			case ctrlEmpty:
+				print(" (empty)\n")
+			case ctrlDeleted:
+				print(" (deleted)\n")
+			default:
+				print("\n")
+			}
+
+			print("\t\t\t\tkey  ")
+			dump(g.key(typ, j), typ.Key.Size_)
+			println("")
+			print("\t\t\t\telem ")
+			dump(g.elem(typ, j), typ.Elem.Size_)
+			println("")
+		}
+	}
+}
+
+// TODO(prattmic): not in hex because print doesn't have a way to print in hex
+// outside the runtime.
+func dump(ptr unsafe.Pointer, size uintptr) {
+	for size > 0 {
+		print(*(*byte)(ptr), " ")
+		ptr = unsafe.Pointer(uintptr(ptr) + 1)
+		size--
+	}
+}
diff --git a/src/runtime/internal/math/math.go b/src/internal/runtime/math/math.go
similarity index 100%
rename from src/runtime/internal/math/math.go
rename to src/internal/runtime/math/math.go
diff --git a/src/runtime/internal/math/math_test.go b/src/internal/runtime/math/math_test.go
similarity index 98%
rename from src/runtime/internal/math/math_test.go
rename to src/internal/runtime/math/math_test.go
index 303eb634..8405999d 100644
--- a/src/runtime/internal/math/math_test.go
+++ b/src/internal/runtime/math/math_test.go
@@ -5,7 +5,7 @@
 package math_test
 
 import (
-	. "runtime/internal/math"
+	. "internal/runtime/math"
 	"testing"
 )
 
diff --git a/src/runtime/internal/sys/consts.go b/src/internal/runtime/sys/consts.go
similarity index 91%
rename from src/runtime/internal/sys/consts.go
rename to src/internal/runtime/sys/consts.go
index 98c0f09e..96e630ed 100644
--- a/src/runtime/internal/sys/consts.go
+++ b/src/internal/runtime/sys/consts.go
@@ -9,10 +9,10 @@ import (
 	"internal/goos"
 )
 
-// AIX requires a larger stack for syscalls.
+// AIX and OpenBSD require a larger stack for syscalls.
 // The race build also needs more stack. See issue 54291.
 // This arithmetic must match that in cmd/internal/objabi/stack.go:stackGuardMultiplier.
-const StackGuardMultiplier = 1 + goos.IsAix + isRace
+const StackGuardMultiplier = 1 + goos.IsAix + goos.IsOpenbsd + isRace
 
 // DefaultPhysPageSize is the default physical page size.
 const DefaultPhysPageSize = goarch.DefaultPhysPageSize
diff --git a/src/runtime/internal/sys/consts_norace.go b/src/internal/runtime/sys/consts_norace.go
similarity index 100%
rename from src/runtime/internal/sys/consts_norace.go
rename to src/internal/runtime/sys/consts_norace.go
diff --git a/src/runtime/internal/sys/consts_race.go b/src/internal/runtime/sys/consts_race.go
similarity index 100%
rename from src/runtime/internal/sys/consts_race.go
rename to src/internal/runtime/sys/consts_race.go
diff --git a/src/internal/runtime/sys/dit_arm64.go b/src/internal/runtime/sys/dit_arm64.go
new file mode 100644
index 00000000..643fd770
--- /dev/null
+++ b/src/internal/runtime/sys/dit_arm64.go
@@ -0,0 +1,17 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build arm64
+
+package sys
+
+import (
+	"internal/cpu"
+)
+
+var DITSupported = cpu.ARM64.HasDIT
+
+func EnableDIT() bool
+func DITEnabled() bool
+func DisableDIT()
diff --git a/src/internal/runtime/sys/dit_arm64.s b/src/internal/runtime/sys/dit_arm64.s
new file mode 100644
index 00000000..c27dfc9a
--- /dev/null
+++ b/src/internal/runtime/sys/dit_arm64.s
@@ -0,0 +1,22 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "textflag.h"
+
+TEXT ·EnableDIT(SB),$0-1
+    MRS DIT, R0
+    UBFX $24, R0, $1, R1
+    MOVB R1, ret+0(FP)
+    MSR $1, DIT
+    RET
+
+TEXT ·DITEnabled(SB),$0-1
+    MRS DIT, R0
+    UBFX $24, R0, $1, R1
+    MOVB R1, ret+0(FP)
+    RET
+
+TEXT ·DisableDIT(SB),$0
+    MSR $0, DIT
+    RET
diff --git a/src/internal/runtime/sys/empty.s b/src/internal/runtime/sys/empty.s
new file mode 100644
index 00000000..3e62b7da
--- /dev/null
+++ b/src/internal/runtime/sys/empty.s
@@ -0,0 +1 @@
+// Empty assembly file to allow empty function bodies for intrinsics.
diff --git a/src/runtime/internal/sys/intrinsics.go b/src/internal/runtime/sys/intrinsics.go
similarity index 81%
rename from src/runtime/internal/sys/intrinsics.go
rename to src/internal/runtime/sys/intrinsics.go
index e6a37584..147d5581 100644
--- a/src/runtime/internal/sys/intrinsics.go
+++ b/src/internal/runtime/sys/intrinsics.go
@@ -206,3 +206,51 @@ func Prefetch(addr uintptr) {}
 //
 // ARM64: Produce PRFM instruction with PLDL1STRM option
 func PrefetchStreamed(addr uintptr) {}
+
+// GetCallerPC returns the program counter (PC) of its caller's caller.
+// GetCallerSP returns the stack pointer (SP) of its caller's caller.
+// Both are implemented as intrinsics on every platform.
+//
+// For example:
+//
+//	func f(arg1, arg2, arg3 int) {
+//		pc := GetCallerPC()
+//		sp := GetCallerSP()
+//	}
+//
+// These two lines find the PC and SP immediately following
+// the call to f (where f will return).
+//
+// The call to GetCallerPC and GetCallerSP must be done in the
+// frame being asked about.
+//
+// The result of GetCallerSP is correct at the time of the return,
+// but it may be invalidated by any subsequent call to a function
+// that might relocate the stack in order to grow or shrink it.
+// A general rule is that the result of GetCallerSP should be used
+// immediately and can only be passed to nosplit functions.
+
+func GetCallerPC() uintptr
+
+func GetCallerSP() uintptr
+
+// GetClosurePtr returns the pointer to the current closure.
+// GetClosurePtr can only be used in an assignment statement
+// at the entry of a function. Moreover, go:nosplit directive
+// must be specified at the declaration of caller function,
+// so that the function prolog does not clobber the closure register.
+// for example:
+//
+//	//go:nosplit
+//	func f(arg1, arg2, arg3 int) {
+//		dx := GetClosurePtr()
+//	}
+//
+// The compiler rewrites calls to this function into instructions that fetch the
+// pointer from a well-known register (DX on x86 architecture, etc.) directly.
+//
+// WARNING: PGO-based devirtualization cannot detect that caller of
+// GetClosurePtr requires closure context, and thus must maintain a list of
+// these functions, which is in
+// cmd/compile/internal/devirtualize/pgo.maybeDevirtualizeFunctionCall.
+func GetClosurePtr() uintptr
diff --git a/src/runtime/internal/sys/intrinsics_test.go b/src/internal/runtime/sys/intrinsics_test.go
similarity index 97%
rename from src/runtime/internal/sys/intrinsics_test.go
rename to src/internal/runtime/sys/intrinsics_test.go
index 67998850..d466f3e5 100644
--- a/src/runtime/internal/sys/intrinsics_test.go
+++ b/src/internal/runtime/sys/intrinsics_test.go
@@ -5,7 +5,7 @@
 package sys_test
 
 import (
-	"runtime/internal/sys"
+	"internal/runtime/sys"
 	"testing"
 )
 
diff --git a/src/runtime/internal/sys/nih.go b/src/internal/runtime/sys/nih.go
similarity index 95%
rename from src/runtime/internal/sys/nih.go
rename to src/internal/runtime/sys/nih.go
index 17eab673..a9cbc48e 100644
--- a/src/runtime/internal/sys/nih.go
+++ b/src/internal/runtime/sys/nih.go
@@ -14,7 +14,7 @@ type nih struct{}
 // Other types can embed NotInHeap to make it not-in-heap. Specifically, pointers
 // to these types must always fail the `runtime.inheap` check. The type may be used
 // for global variables, or for objects in unmanaged memory (e.g., allocated with
-// `sysAlloc`, `persistentalloc`, r`fixalloc`, or from a manually-managed span).
+// `sysAlloc`, `persistentalloc`, `fixalloc`, or from a manually-managed span).
 //
 // Specifically:
 //
diff --git a/src/internal/runtime/sys/no_dit.go b/src/internal/runtime/sys/no_dit.go
new file mode 100644
index 00000000..0589d0ca
--- /dev/null
+++ b/src/internal/runtime/sys/no_dit.go
@@ -0,0 +1,13 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build !arm64
+
+package sys
+
+var DITSupported = false
+
+func EnableDIT() bool  { return false }
+func DITEnabled() bool { return false }
+func DisableDIT()      {}
diff --git a/src/runtime/internal/sys/sys.go b/src/internal/runtime/sys/sys.go
similarity index 100%
rename from src/runtime/internal/sys/sys.go
rename to src/internal/runtime/sys/sys.go
diff --git a/src/internal/stringslite/strings.go b/src/internal/stringslite/strings.go
index 4114b861..3a09e08c 100644
--- a/src/internal/stringslite/strings.go
+++ b/src/internal/stringslite/strings.go
@@ -14,7 +14,7 @@ import (
 )
 
 func HasPrefix(s, prefix string) bool {
-	return len(s) >= len(prefix) && s[0:len(prefix)] == prefix
+	return len(s) >= len(prefix) && s[:len(prefix)] == prefix
 }
 
 func HasSuffix(s, suffix string) bool {
diff --git a/src/internal/sync/export_test.go b/src/internal/sync/export_test.go
new file mode 100644
index 00000000..c6449bf3
--- /dev/null
+++ b/src/internal/sync/export_test.go
@@ -0,0 +1,38 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package sync
+
+import (
+	"internal/abi"
+	"unsafe"
+)
+
+// NewBadHashTrieMap creates a new HashTrieMap for the provided key and value
+// but with an intentionally bad hash function.
+func NewBadHashTrieMap[K, V comparable]() *HashTrieMap[K, V] {
+	// Stub out the good hash function with a terrible one.
+	// Everything should still work as expected.
+	var m HashTrieMap[K, V]
+	m.init()
+	m.keyHash = func(_ unsafe.Pointer, _ uintptr) uintptr {
+		return 0
+	}
+	return &m
+}
+
+// NewTruncHashTrieMap creates a new HashTrieMap for the provided key and value
+// but with an intentionally bad hash function.
+func NewTruncHashTrieMap[K, V comparable]() *HashTrieMap[K, V] {
+	// Stub out the good hash function with a terrible one.
+	// Everything should still work as expected.
+	var m HashTrieMap[K, V]
+	var mx map[string]int
+	mapType := abi.TypeOf(mx).MapType()
+	hasher := mapType.Hasher
+	m.keyHash = func(p unsafe.Pointer, n uintptr) uintptr {
+		return hasher(p, n) & ((uintptr(1) << 4) - 1)
+	}
+	return &m
+}
diff --git a/src/internal/sync/hashtriemap.go b/src/internal/sync/hashtriemap.go
new file mode 100644
index 00000000..6f5e0b43
--- /dev/null
+++ b/src/internal/sync/hashtriemap.go
@@ -0,0 +1,724 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package sync
+
+import (
+	"internal/abi"
+	"internal/goarch"
+	"sync/atomic"
+	"unsafe"
+)
+
+// HashTrieMap is an implementation of a concurrent hash-trie. The implementation
+// is designed around frequent loads, but offers decent performance for stores
+// and deletes as well, especially if the map is larger. Its primary use-case is
+// the unique package, but can be used elsewhere as well.
+//
+// The zero HashTrieMap is empty and ready to use.
+// It must not be copied after first use.
+type HashTrieMap[K comparable, V any] struct {
+	inited   atomic.Uint32
+	initMu   Mutex
+	root     atomic.Pointer[indirect[K, V]]
+	keyHash  hashFunc
+	valEqual equalFunc
+	seed     uintptr
+}
+
+func (ht *HashTrieMap[K, V]) init() {
+	if ht.inited.Load() == 0 {
+		ht.initSlow()
+	}
+}
+
+//go:noinline
+func (ht *HashTrieMap[K, V]) initSlow() {
+	ht.initMu.Lock()
+	defer ht.initMu.Unlock()
+
+	if ht.inited.Load() != 0 {
+		// Someone got to it while we were waiting.
+		return
+	}
+
+	// Set up root node, derive the hash function for the key, and the
+	// equal function for the value, if any.
+	var m map[K]V
+	mapType := abi.TypeOf(m).MapType()
+	ht.root.Store(newIndirectNode[K, V](nil))
+	ht.keyHash = mapType.Hasher
+	ht.valEqual = mapType.Elem.Equal
+	ht.seed = uintptr(runtime_rand())
+
+	ht.inited.Store(1)
+}
+
+type hashFunc func(unsafe.Pointer, uintptr) uintptr
+type equalFunc func(unsafe.Pointer, unsafe.Pointer) bool
+
+// Load returns the value stored in the map for a key, or nil if no
+// value is present.
+// The ok result indicates whether value was found in the map.
+func (ht *HashTrieMap[K, V]) Load(key K) (value V, ok bool) {
+	ht.init()
+	hash := ht.keyHash(abi.NoEscape(unsafe.Pointer(&key)), ht.seed)
+
+	i := ht.root.Load()
+	hashShift := 8 * goarch.PtrSize
+	for hashShift != 0 {
+		hashShift -= nChildrenLog2
+
+		n := i.children[(hash>>hashShift)&nChildrenMask].Load()
+		if n == nil {
+			return *new(V), false
+		}
+		if n.isEntry {
+			return n.entry().lookup(key)
+		}
+		i = n.indirect()
+	}
+	panic("internal/sync.HashTrieMap: ran out of hash bits while iterating")
+}
+
+// LoadOrStore returns the existing value for the key if present.
+// Otherwise, it stores and returns the given value.
+// The loaded result is true if the value was loaded, false if stored.
+func (ht *HashTrieMap[K, V]) LoadOrStore(key K, value V) (result V, loaded bool) {
+	ht.init()
+	hash := ht.keyHash(abi.NoEscape(unsafe.Pointer(&key)), ht.seed)
+	var i *indirect[K, V]
+	var hashShift uint
+	var slot *atomic.Pointer[node[K, V]]
+	var n *node[K, V]
+	for {
+		// Find the key or a candidate location for insertion.
+		i = ht.root.Load()
+		hashShift = 8 * goarch.PtrSize
+		haveInsertPoint := false
+		for hashShift != 0 {
+			hashShift -= nChildrenLog2
+
+			slot = &i.children[(hash>>hashShift)&nChildrenMask]
+			n = slot.Load()
+			if n == nil {
+				// We found a nil slot which is a candidate for insertion.
+				haveInsertPoint = true
+				break
+			}
+			if n.isEntry {
+				// We found an existing entry, which is as far as we can go.
+				// If it stays this way, we'll have to replace it with an
+				// indirect node.
+				if v, ok := n.entry().lookup(key); ok {
+					return v, true
+				}
+				haveInsertPoint = true
+				break
+			}
+			i = n.indirect()
+		}
+		if !haveInsertPoint {
+			panic("internal/sync.HashTrieMap: ran out of hash bits while iterating")
+		}
+
+		// Grab the lock and double-check what we saw.
+		i.mu.Lock()
+		n = slot.Load()
+		if (n == nil || n.isEntry) && !i.dead.Load() {
+			// What we saw is still true, so we can continue with the insert.
+			break
+		}
+		// We have to start over.
+		i.mu.Unlock()
+	}
+	// N.B. This lock is held from when we broke out of the outer loop above.
+	// We specifically break this out so that we can use defer here safely.
+	// One option is to break this out into a new function instead, but
+	// there's so much local iteration state used below that this turns out
+	// to be cleaner.
+	defer i.mu.Unlock()
+
+	var oldEntry *entry[K, V]
+	if n != nil {
+		oldEntry = n.entry()
+		if v, ok := oldEntry.lookup(key); ok {
+			// Easy case: by loading again, it turns out exactly what we wanted is here!
+			return v, true
+		}
+	}
+	newEntry := newEntryNode(key, value)
+	if oldEntry == nil {
+		// Easy case: create a new entry and store it.
+		slot.Store(&newEntry.node)
+	} else {
+		// We possibly need to expand the entry already there into one or more new nodes.
+		//
+		// Publish the node last, which will make both oldEntry and newEntry visible. We
+		// don't want readers to be able to observe that oldEntry isn't in the tree.
+		slot.Store(ht.expand(oldEntry, newEntry, hash, hashShift, i))
+	}
+	return value, false
+}
+
+// expand takes oldEntry and newEntry whose hashes conflict from bit 64 down to hashShift and
+// produces a subtree of indirect nodes to hold the two new entries.
+func (ht *HashTrieMap[K, V]) expand(oldEntry, newEntry *entry[K, V], newHash uintptr, hashShift uint, parent *indirect[K, V]) *node[K, V] {
+	// Check for a hash collision.
+	oldHash := ht.keyHash(unsafe.Pointer(&oldEntry.key), ht.seed)
+	if oldHash == newHash {
+		// Store the old entry in the new entry's overflow list, then store
+		// the new entry.
+		newEntry.overflow.Store(oldEntry)
+		return &newEntry.node
+	}
+	// We have to add an indirect node. Worse still, we may need to add more than one.
+	newIndirect := newIndirectNode(parent)
+	top := newIndirect
+	for {
+		if hashShift == 0 {
+			panic("internal/sync.HashTrieMap: ran out of hash bits while inserting")
+		}
+		hashShift -= nChildrenLog2 // hashShift is for the level parent is at. We need to go deeper.
+		oi := (oldHash >> hashShift) & nChildrenMask
+		ni := (newHash >> hashShift) & nChildrenMask
+		if oi != ni {
+			newIndirect.children[oi].Store(&oldEntry.node)
+			newIndirect.children[ni].Store(&newEntry.node)
+			break
+		}
+		nextIndirect := newIndirectNode(newIndirect)
+		newIndirect.children[oi].Store(&nextIndirect.node)
+		newIndirect = nextIndirect
+	}
+	return &top.node
+}
+
+// Store sets the value for a key.
+func (ht *HashTrieMap[K, V]) Store(key K, old V) {
+	_, _ = ht.Swap(key, old)
+}
+
+// Swap swaps the value for a key and returns the previous value if any.
+// The loaded result reports whether the key was present.
+func (ht *HashTrieMap[K, V]) Swap(key K, new V) (previous V, loaded bool) {
+	ht.init()
+	hash := ht.keyHash(abi.NoEscape(unsafe.Pointer(&key)), ht.seed)
+	var i *indirect[K, V]
+	var hashShift uint
+	var slot *atomic.Pointer[node[K, V]]
+	var n *node[K, V]
+	for {
+		// Find the key or a candidate location for insertion.
+		i = ht.root.Load()
+		hashShift = 8 * goarch.PtrSize
+		haveInsertPoint := false
+		for hashShift != 0 {
+			hashShift -= nChildrenLog2
+
+			slot = &i.children[(hash>>hashShift)&nChildrenMask]
+			n = slot.Load()
+			if n == nil || n.isEntry {
+				// We found a nil slot which is a candidate for insertion,
+				// or an existing entry that we'll replace.
+				haveInsertPoint = true
+				break
+			}
+			i = n.indirect()
+		}
+		if !haveInsertPoint {
+			panic("internal/sync.HashTrieMap: ran out of hash bits while iterating")
+		}
+
+		// Grab the lock and double-check what we saw.
+		i.mu.Lock()
+		n = slot.Load()
+		if (n == nil || n.isEntry) && !i.dead.Load() {
+			// What we saw is still true, so we can continue with the insert.
+			break
+		}
+		// We have to start over.
+		i.mu.Unlock()
+	}
+	// N.B. This lock is held from when we broke out of the outer loop above.
+	// We specifically break this out so that we can use defer here safely.
+	// One option is to break this out into a new function instead, but
+	// there's so much local iteration state used below that this turns out
+	// to be cleaner.
+	defer i.mu.Unlock()
+
+	var zero V
+	var oldEntry *entry[K, V]
+	if n != nil {
+		// Swap if the keys compare.
+		oldEntry = n.entry()
+		newEntry, old, swapped := oldEntry.swap(key, new)
+		if swapped {
+			slot.Store(&newEntry.node)
+			return old, true
+		}
+	}
+	// The keys didn't compare, so we're doing an insertion.
+	newEntry := newEntryNode(key, new)
+	if oldEntry == nil {
+		// Easy case: create a new entry and store it.
+		slot.Store(&newEntry.node)
+	} else {
+		// We possibly need to expand the entry already there into one or more new nodes.
+		//
+		// Publish the node last, which will make both oldEntry and newEntry visible. We
+		// don't want readers to be able to observe that oldEntry isn't in the tree.
+		slot.Store(ht.expand(oldEntry, newEntry, hash, hashShift, i))
+	}
+	return zero, false
+}
+
+// CompareAndSwap swaps the old and new values for key
+// if the value stored in the map is equal to old.
+// The value type must be of a comparable type, otherwise CompareAndSwap will panic.
+func (ht *HashTrieMap[K, V]) CompareAndSwap(key K, old, new V) (swapped bool) {
+	ht.init()
+	if ht.valEqual == nil {
+		panic("called CompareAndSwap when value is not of comparable type")
+	}
+	hash := ht.keyHash(abi.NoEscape(unsafe.Pointer(&key)), ht.seed)
+
+	// Find a node with the key and compare with it. n != nil if we found the node.
+	i, _, slot, n := ht.find(key, hash, ht.valEqual, old)
+	if i != nil {
+		defer i.mu.Unlock()
+	}
+	if n == nil {
+		return false
+	}
+
+	// Try to swap the entry.
+	e, swapped := n.entry().compareAndSwap(key, old, new, ht.valEqual)
+	if !swapped {
+		// Nothing was actually swapped, which means the node is no longer there.
+		return false
+	}
+	// Store the entry back because it changed.
+	slot.Store(&e.node)
+	return true
+}
+
+// LoadAndDelete deletes the value for a key, returning the previous value if any.
+// The loaded result reports whether the key was present.
+func (ht *HashTrieMap[K, V]) LoadAndDelete(key K) (value V, loaded bool) {
+	ht.init()
+	hash := ht.keyHash(abi.NoEscape(unsafe.Pointer(&key)), ht.seed)
+
+	// Find a node with the key and compare with it. n != nil if we found the node.
+	i, hashShift, slot, n := ht.find(key, hash, nil, *new(V))
+	if n == nil {
+		if i != nil {
+			i.mu.Unlock()
+		}
+		return *new(V), false
+	}
+
+	// Try to delete the entry.
+	v, e, loaded := n.entry().loadAndDelete(key)
+	if !loaded {
+		// Nothing was actually deleted, which means the node is no longer there.
+		i.mu.Unlock()
+		return *new(V), false
+	}
+	if e != nil {
+		// We didn't actually delete the whole entry, just one entry in the chain.
+		// Nothing else to do, since the parent is definitely not empty.
+		slot.Store(&e.node)
+		i.mu.Unlock()
+		return v, true
+	}
+	// Delete the entry.
+	slot.Store(nil)
+
+	// Check if the node is now empty (and isn't the root), and delete it if able.
+	for i.parent != nil && i.empty() {
+		if hashShift == 8*goarch.PtrSize {
+			panic("internal/sync.HashTrieMap: ran out of hash bits while iterating")
+		}
+		hashShift += nChildrenLog2
+
+		// Delete the current node in the parent.
+		parent := i.parent
+		parent.mu.Lock()
+		i.dead.Store(true)
+		parent.children[(hash>>hashShift)&nChildrenMask].Store(nil)
+		i.mu.Unlock()
+		i = parent
+	}
+	i.mu.Unlock()
+	return v, true
+}
+
+// Delete deletes the value for a key.
+func (ht *HashTrieMap[K, V]) Delete(key K) {
+	_, _ = ht.LoadAndDelete(key)
+}
+
+// CompareAndDelete deletes the entry for key if its value is equal to old.
+// The value type must be comparable, otherwise this CompareAndDelete will panic.
+//
+// If there is no current value for key in the map, CompareAndDelete returns false
+// (even if the old value is the nil interface value).
+func (ht *HashTrieMap[K, V]) CompareAndDelete(key K, old V) (deleted bool) {
+	ht.init()
+	if ht.valEqual == nil {
+		panic("called CompareAndDelete when value is not of comparable type")
+	}
+	hash := ht.keyHash(abi.NoEscape(unsafe.Pointer(&key)), ht.seed)
+
+	// Find a node with the key. n != nil if we found the node.
+	i, hashShift, slot, n := ht.find(key, hash, nil, *new(V))
+	if n == nil {
+		if i != nil {
+			i.mu.Unlock()
+		}
+		return false
+	}
+
+	// Try to delete the entry.
+	e, deleted := n.entry().compareAndDelete(key, old, ht.valEqual)
+	if !deleted {
+		// Nothing was actually deleted, which means the node is no longer there.
+		i.mu.Unlock()
+		return false
+	}
+	if e != nil {
+		// We didn't actually delete the whole entry, just one entry in the chain.
+		// Nothing else to do, since the parent is definitely not empty.
+		slot.Store(&e.node)
+		i.mu.Unlock()
+		return true
+	}
+	// Delete the entry.
+	slot.Store(nil)
+
+	// Check if the node is now empty (and isn't the root), and delete it if able.
+	for i.parent != nil && i.empty() {
+		if hashShift == 8*goarch.PtrSize {
+			panic("internal/sync.HashTrieMap: ran out of hash bits while iterating")
+		}
+		hashShift += nChildrenLog2
+
+		// Delete the current node in the parent.
+		parent := i.parent
+		parent.mu.Lock()
+		i.dead.Store(true)
+		parent.children[(hash>>hashShift)&nChildrenMask].Store(nil)
+		i.mu.Unlock()
+		i = parent
+	}
+	i.mu.Unlock()
+	return true
+}
+
+// find searches the tree for a node that contains key (hash must be the hash of key).
+// If valEqual != nil, then it will also enforce that the values are equal as well.
+//
+// Returns a non-nil node, which will always be an entry, if found.
+//
+// If i != nil then i.mu is locked, and it is the caller's responsibility to unlock it.
+func (ht *HashTrieMap[K, V]) find(key K, hash uintptr, valEqual equalFunc, value V) (i *indirect[K, V], hashShift uint, slot *atomic.Pointer[node[K, V]], n *node[K, V]) {
+	for {
+		// Find the key or return if it's not there.
+		i = ht.root.Load()
+		hashShift = 8 * goarch.PtrSize
+		found := false
+		for hashShift != 0 {
+			hashShift -= nChildrenLog2
+
+			slot = &i.children[(hash>>hashShift)&nChildrenMask]
+			n = slot.Load()
+			if n == nil {
+				// Nothing to compare with. Give up.
+				i = nil
+				return
+			}
+			if n.isEntry {
+				// We found an entry. Check if it matches.
+				if _, ok := n.entry().lookupWithValue(key, value, valEqual); !ok {
+					// No match, comparison failed.
+					i = nil
+					n = nil
+					return
+				}
+				// We've got a match. Prepare to perform an operation on the key.
+				found = true
+				break
+			}
+			i = n.indirect()
+		}
+		if !found {
+			panic("internal/sync.HashTrieMap: ran out of hash bits while iterating")
+		}
+
+		// Grab the lock and double-check what we saw.
+		i.mu.Lock()
+		n = slot.Load()
+		if !i.dead.Load() && (n == nil || n.isEntry) {
+			// Either we've got a valid node or the node is now nil under the lock.
+			// In either case, we're done here.
+			return
+		}
+		// We have to start over.
+		i.mu.Unlock()
+	}
+}
+
+// All returns an iterator over each key and value present in the map.
+//
+// The iterator does not necessarily correspond to any consistent snapshot of the
+// HashTrieMap's contents: no key will be visited more than once, but if the value
+// for any key is stored or deleted concurrently (including by yield), the iterator
+// may reflect any mapping for that key from any point during iteration. The iterator
+// does not block other methods on the receiver; even yield itself may call any
+// method on the HashTrieMap.
+func (ht *HashTrieMap[K, V]) All() func(yield func(K, V) bool) {
+	ht.init()
+	return func(yield func(key K, value V) bool) {
+		ht.iter(ht.root.Load(), yield)
+	}
+}
+
+// Range calls f sequentially for each key and value present in the map.
+// If f returns false, range stops the iteration.
+//
+// This exists for compatibility with sync.Map; All should be preferred.
+// It provides the same guarantees as sync.Map, and All.
+func (ht *HashTrieMap[K, V]) Range(yield func(K, V) bool) {
+	ht.init()
+	ht.iter(ht.root.Load(), yield)
+}
+
+func (ht *HashTrieMap[K, V]) iter(i *indirect[K, V], yield func(key K, value V) bool) bool {
+	for j := range i.children {
+		n := i.children[j].Load()
+		if n == nil {
+			continue
+		}
+		if !n.isEntry {
+			if !ht.iter(n.indirect(), yield) {
+				return false
+			}
+			continue
+		}
+		e := n.entry()
+		for e != nil {
+			if !yield(e.key, e.value) {
+				return false
+			}
+			e = e.overflow.Load()
+		}
+	}
+	return true
+}
+
+// Clear deletes all the entries, resulting in an empty HashTrieMap.
+func (ht *HashTrieMap[K, V]) Clear() {
+	ht.init()
+
+	// It's sufficient to just drop the root on the floor, but the root
+	// must always be non-nil.
+	ht.root.Store(newIndirectNode[K, V](nil))
+}
+
+const (
+	// 16 children. This seems to be the sweet spot for
+	// load performance: any smaller and we lose out on
+	// 50% or more in CPU performance. Any larger and the
+	// returns are minuscule (~1% improvement for 32 children).
+	nChildrenLog2 = 4
+	nChildren     = 1 << nChildrenLog2
+	nChildrenMask = nChildren - 1
+)
+
+// indirect is an internal node in the hash-trie.
+type indirect[K comparable, V any] struct {
+	node[K, V]
+	dead     atomic.Bool
+	mu       Mutex // Protects mutation to children and any children that are entry nodes.
+	parent   *indirect[K, V]
+	children [nChildren]atomic.Pointer[node[K, V]]
+}
+
+func newIndirectNode[K comparable, V any](parent *indirect[K, V]) *indirect[K, V] {
+	return &indirect[K, V]{node: node[K, V]{isEntry: false}, parent: parent}
+}
+
+func (i *indirect[K, V]) empty() bool {
+	nc := 0
+	for j := range i.children {
+		if i.children[j].Load() != nil {
+			nc++
+		}
+	}
+	return nc == 0
+}
+
+// entry is a leaf node in the hash-trie.
+type entry[K comparable, V any] struct {
+	node[K, V]
+	overflow atomic.Pointer[entry[K, V]] // Overflow for hash collisions.
+	key      K
+	value    V
+}
+
+func newEntryNode[K comparable, V any](key K, value V) *entry[K, V] {
+	return &entry[K, V]{
+		node:  node[K, V]{isEntry: true},
+		key:   key,
+		value: value,
+	}
+}
+
+func (e *entry[K, V]) lookup(key K) (V, bool) {
+	for e != nil {
+		if e.key == key {
+			return e.value, true
+		}
+		e = e.overflow.Load()
+	}
+	return *new(V), false
+}
+
+func (e *entry[K, V]) lookupWithValue(key K, value V, valEqual equalFunc) (V, bool) {
+	for e != nil {
+		if e.key == key && (valEqual == nil || valEqual(unsafe.Pointer(&e.value), abi.NoEscape(unsafe.Pointer(&value)))) {
+			return e.value, true
+		}
+		e = e.overflow.Load()
+	}
+	return *new(V), false
+}
+
+// swap replaces an entry in the overflow chain if keys compare equal. Returns the new entry chain,
+// the old value, and whether or not anything was swapped.
+//
+// swap must be called under the mutex of the indirect node which e is a child of.
+func (head *entry[K, V]) swap(key K, new V) (*entry[K, V], V, bool) {
+	if head.key == key {
+		// Return the new head of the list.
+		e := newEntryNode(key, new)
+		if chain := head.overflow.Load(); chain != nil {
+			e.overflow.Store(chain)
+		}
+		return e, head.value, true
+	}
+	i := &head.overflow
+	e := i.Load()
+	for e != nil {
+		if e.key == key {
+			eNew := newEntryNode(key, new)
+			eNew.overflow.Store(e.overflow.Load())
+			i.Store(eNew)
+			return head, e.value, true
+		}
+		i = &e.overflow
+		e = e.overflow.Load()
+	}
+	var zero V
+	return head, zero, false
+}
+
+// compareAndSwap replaces an entry in the overflow chain if both the key and value compare
+// equal. Returns the new entry chain and whether or not anything was swapped.
+//
+// compareAndSwap must be called under the mutex of the indirect node which e is a child of.
+func (head *entry[K, V]) compareAndSwap(key K, old, new V, valEqual equalFunc) (*entry[K, V], bool) {
+	if head.key == key && valEqual(unsafe.Pointer(&head.value), abi.NoEscape(unsafe.Pointer(&old))) {
+		// Return the new head of the list.
+		e := newEntryNode(key, new)
+		if chain := head.overflow.Load(); chain != nil {
+			e.overflow.Store(chain)
+		}
+		return e, true
+	}
+	i := &head.overflow
+	e := i.Load()
+	for e != nil {
+		if e.key == key && valEqual(unsafe.Pointer(&e.value), abi.NoEscape(unsafe.Pointer(&old))) {
+			eNew := newEntryNode(key, new)
+			eNew.overflow.Store(e.overflow.Load())
+			i.Store(eNew)
+			return head, true
+		}
+		i = &e.overflow
+		e = e.overflow.Load()
+	}
+	return head, false
+}
+
+// loadAndDelete deletes an entry in the overflow chain by key. Returns the value for the key, the new
+// entry chain and whether or not anything was loaded (and deleted).
+//
+// loadAndDelete must be called under the mutex of the indirect node which e is a child of.
+func (head *entry[K, V]) loadAndDelete(key K) (V, *entry[K, V], bool) {
+	if head.key == key {
+		// Drop the head of the list.
+		return head.value, head.overflow.Load(), true
+	}
+	i := &head.overflow
+	e := i.Load()
+	for e != nil {
+		if e.key == key {
+			i.Store(e.overflow.Load())
+			return e.value, head, true
+		}
+		i = &e.overflow
+		e = e.overflow.Load()
+	}
+	return *new(V), head, false
+}
+
+// compareAndDelete deletes an entry in the overflow chain if both the key and value compare
+// equal. Returns the new entry chain and whether or not anything was deleted.
+//
+// compareAndDelete must be called under the mutex of the indirect node which e is a child of.
+func (head *entry[K, V]) compareAndDelete(key K, value V, valEqual equalFunc) (*entry[K, V], bool) {
+	if head.key == key && valEqual(unsafe.Pointer(&head.value), abi.NoEscape(unsafe.Pointer(&value))) {
+		// Drop the head of the list.
+		return head.overflow.Load(), true
+	}
+	i := &head.overflow
+	e := i.Load()
+	for e != nil {
+		if e.key == key && valEqual(unsafe.Pointer(&e.value), abi.NoEscape(unsafe.Pointer(&value))) {
+			i.Store(e.overflow.Load())
+			return head, true
+		}
+		i = &e.overflow
+		e = e.overflow.Load()
+	}
+	return head, false
+}
+
+// node is the header for a node. It's polymorphic and
+// is actually either an entry or an indirect.
+type node[K comparable, V any] struct {
+	isEntry bool
+}
+
+func (n *node[K, V]) entry() *entry[K, V] {
+	if !n.isEntry {
+		panic("called entry on non-entry node")
+	}
+	return (*entry[K, V])(unsafe.Pointer(n))
+}
+
+func (n *node[K, V]) indirect() *indirect[K, V] {
+	if n.isEntry {
+		panic("called indirect on entry node")
+	}
+	return (*indirect[K, V])(unsafe.Pointer(n))
+}
+
+// Pull in runtime.rand so that we don't need to take a dependency
+// on math/rand/v2.
+//
+//go:linkname runtime_rand runtime.rand
+func runtime_rand() uint64
diff --git a/src/internal/concurrent/hashtriemap_bench_test.go b/src/internal/sync/hashtriemap_bench_test.go
similarity index 89%
rename from src/internal/concurrent/hashtriemap_bench_test.go
rename to src/internal/sync/hashtriemap_bench_test.go
index 32a263d5..fc10d822 100644
--- a/src/internal/concurrent/hashtriemap_bench_test.go
+++ b/src/internal/sync/hashtriemap_bench_test.go
@@ -2,9 +2,12 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-package concurrent
+package sync_test
 
-import "testing"
+import (
+	isync "internal/sync"
+	"testing"
+)
 
 func BenchmarkHashTrieMapLoadSmall(b *testing.B) {
 	benchmarkHashTrieMapLoad(b, testDataSmall[:])
@@ -20,7 +23,7 @@ func BenchmarkHashTrieMapLoadLarge(b *testing.B) {
 
 func benchmarkHashTrieMapLoad(b *testing.B, data []string) {
 	b.ReportAllocs()
-	m := NewHashTrieMap[string, int]()
+	var m isync.HashTrieMap[string, int]
 	for i := range data {
 		m.LoadOrStore(data[i], i)
 	}
@@ -47,7 +50,7 @@ func BenchmarkHashTrieMapLoadOrStoreLarge(b *testing.B) {
 
 func benchmarkHashTrieMapLoadOrStore(b *testing.B, data []string) {
 	b.ReportAllocs()
-	m := NewHashTrieMap[string, int]()
+	var m isync.HashTrieMap[string, int]
 
 	b.RunParallel(func(pb *testing.PB) {
 		i := 0
diff --git a/src/internal/sync/hashtriemap_test.go b/src/internal/sync/hashtriemap_test.go
new file mode 100644
index 00000000..d9219f84
--- /dev/null
+++ b/src/internal/sync/hashtriemap_test.go
@@ -0,0 +1,982 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package sync_test
+
+import (
+	"fmt"
+	isync "internal/sync"
+	"math"
+	"runtime"
+	"strconv"
+	"sync"
+	"testing"
+	"weak"
+)
+
+func TestHashTrieMap(t *testing.T) {
+	testHashTrieMap(t, func() *isync.HashTrieMap[string, int] {
+		var m isync.HashTrieMap[string, int]
+		return &m
+	})
+}
+
+func TestHashTrieMapBadHash(t *testing.T) {
+	testHashTrieMap(t, func() *isync.HashTrieMap[string, int] {
+		return isync.NewBadHashTrieMap[string, int]()
+	})
+}
+
+func TestHashTrieMapTruncHash(t *testing.T) {
+	testHashTrieMap(t, func() *isync.HashTrieMap[string, int] {
+		// Stub out the good hash function with a different terrible one
+		// (truncated hash). Everything should still work as expected.
+		// This is useful to test independently to catch issues with
+		// near collisions, where only the last few bits of the hash differ.
+		return isync.NewTruncHashTrieMap[string, int]()
+	})
+}
+
+func testHashTrieMap(t *testing.T, newMap func() *isync.HashTrieMap[string, int]) {
+	t.Run("LoadEmpty", func(t *testing.T) {
+		m := newMap()
+
+		for _, s := range testData {
+			expectMissing(t, s, 0)(m.Load(s))
+		}
+	})
+	t.Run("LoadOrStore", func(t *testing.T) {
+		m := newMap()
+
+		for i, s := range testData {
+			expectMissing(t, s, 0)(m.Load(s))
+			expectStored(t, s, i)(m.LoadOrStore(s, i))
+			expectPresent(t, s, i)(m.Load(s))
+			expectLoaded(t, s, i)(m.LoadOrStore(s, 0))
+		}
+		for i, s := range testData {
+			expectPresent(t, s, i)(m.Load(s))
+			expectLoaded(t, s, i)(m.LoadOrStore(s, 0))
+		}
+	})
+	t.Run("All", func(t *testing.T) {
+		m := newMap()
+
+		testAll(t, m, testDataMap(testData[:]), func(_ string, _ int) bool {
+			return true
+		})
+	})
+	t.Run("Clear", func(t *testing.T) {
+		t.Run("Simple", func(t *testing.T) {
+			m := newMap()
+
+			for i, s := range testData {
+				expectMissing(t, s, 0)(m.Load(s))
+				expectStored(t, s, i)(m.LoadOrStore(s, i))
+				expectPresent(t, s, i)(m.Load(s))
+				expectLoaded(t, s, i)(m.LoadOrStore(s, 0))
+			}
+			m.Clear()
+			for _, s := range testData {
+				expectMissing(t, s, 0)(m.Load(s))
+			}
+		})
+		t.Run("Concurrent", func(t *testing.T) {
+			m := newMap()
+
+			// Load up the map.
+			for i, s := range testData {
+				expectMissing(t, s, 0)(m.Load(s))
+				expectStored(t, s, i)(m.LoadOrStore(s, i))
+			}
+			gmp := runtime.GOMAXPROCS(-1)
+			var wg sync.WaitGroup
+			for i := range gmp {
+				wg.Add(1)
+				go func(id int) {
+					defer wg.Done()
+
+					for _, s := range testData {
+						// Try a couple things to interfere with the clear.
+						expectNotDeleted(t, s, math.MaxInt)(m.CompareAndDelete(s, math.MaxInt))
+						m.CompareAndSwap(s, i, i+1) // May succeed or fail; we don't care.
+					}
+				}(i)
+			}
+
+			// Concurrently clear the map.
+			runtime.Gosched()
+			m.Clear()
+
+			// Wait for workers to finish.
+			wg.Wait()
+
+			// It should all be empty now.
+			for _, s := range testData {
+				expectMissing(t, s, 0)(m.Load(s))
+			}
+		})
+	})
+	t.Run("CompareAndDelete", func(t *testing.T) {
+		t.Run("All", func(t *testing.T) {
+			m := newMap()
+
+			for range 3 {
+				for i, s := range testData {
+					expectMissing(t, s, 0)(m.Load(s))
+					expectStored(t, s, i)(m.LoadOrStore(s, i))
+					expectPresent(t, s, i)(m.Load(s))
+					expectLoaded(t, s, i)(m.LoadOrStore(s, 0))
+				}
+				for i, s := range testData {
+					expectPresent(t, s, i)(m.Load(s))
+					expectNotDeleted(t, s, math.MaxInt)(m.CompareAndDelete(s, math.MaxInt))
+					expectDeleted(t, s, i)(m.CompareAndDelete(s, i))
+					expectNotDeleted(t, s, i)(m.CompareAndDelete(s, i))
+					expectMissing(t, s, 0)(m.Load(s))
+				}
+				for _, s := range testData {
+					expectMissing(t, s, 0)(m.Load(s))
+				}
+			}
+		})
+		t.Run("One", func(t *testing.T) {
+			m := newMap()
+
+			for i, s := range testData {
+				expectMissing(t, s, 0)(m.Load(s))
+				expectStored(t, s, i)(m.LoadOrStore(s, i))
+				expectPresent(t, s, i)(m.Load(s))
+				expectLoaded(t, s, i)(m.LoadOrStore(s, 0))
+			}
+			expectNotDeleted(t, testData[15], math.MaxInt)(m.CompareAndDelete(testData[15], math.MaxInt))
+			expectDeleted(t, testData[15], 15)(m.CompareAndDelete(testData[15], 15))
+			expectNotDeleted(t, testData[15], 15)(m.CompareAndDelete(testData[15], 15))
+			for i, s := range testData {
+				if i == 15 {
+					expectMissing(t, s, 0)(m.Load(s))
+				} else {
+					expectPresent(t, s, i)(m.Load(s))
+				}
+			}
+		})
+		t.Run("Multiple", func(t *testing.T) {
+			m := newMap()
+
+			for i, s := range testData {
+				expectMissing(t, s, 0)(m.Load(s))
+				expectStored(t, s, i)(m.LoadOrStore(s, i))
+				expectPresent(t, s, i)(m.Load(s))
+				expectLoaded(t, s, i)(m.LoadOrStore(s, 0))
+			}
+			for _, i := range []int{1, 105, 6, 85} {
+				expectNotDeleted(t, testData[i], math.MaxInt)(m.CompareAndDelete(testData[i], math.MaxInt))
+				expectDeleted(t, testData[i], i)(m.CompareAndDelete(testData[i], i))
+				expectNotDeleted(t, testData[i], i)(m.CompareAndDelete(testData[i], i))
+			}
+			for i, s := range testData {
+				if i == 1 || i == 105 || i == 6 || i == 85 {
+					expectMissing(t, s, 0)(m.Load(s))
+				} else {
+					expectPresent(t, s, i)(m.Load(s))
+				}
+			}
+		})
+		t.Run("Iterate", func(t *testing.T) {
+			m := newMap()
+
+			testAll(t, m, testDataMap(testData[:]), func(s string, i int) bool {
+				expectDeleted(t, s, i)(m.CompareAndDelete(s, i))
+				return true
+			})
+			for _, s := range testData {
+				expectMissing(t, s, 0)(m.Load(s))
+			}
+		})
+		t.Run("ConcurrentUnsharedKeys", func(t *testing.T) {
+			m := newMap()
+
+			gmp := runtime.GOMAXPROCS(-1)
+			var wg sync.WaitGroup
+			for i := range gmp {
+				wg.Add(1)
+				go func(id int) {
+					defer wg.Done()
+
+					makeKey := func(s string) string {
+						return s + "-" + strconv.Itoa(id)
+					}
+					for _, s := range testData {
+						key := makeKey(s)
+						expectMissing(t, key, 0)(m.Load(key))
+						expectStored(t, key, id)(m.LoadOrStore(key, id))
+						expectPresent(t, key, id)(m.Load(key))
+						expectLoaded(t, key, id)(m.LoadOrStore(key, 0))
+					}
+					for _, s := range testData {
+						key := makeKey(s)
+						expectPresent(t, key, id)(m.Load(key))
+						expectDeleted(t, key, id)(m.CompareAndDelete(key, id))
+						expectMissing(t, key, 0)(m.Load(key))
+					}
+					for _, s := range testData {
+						key := makeKey(s)
+						expectMissing(t, key, 0)(m.Load(key))
+					}
+				}(i)
+			}
+			wg.Wait()
+		})
+		t.Run("ConcurrentSharedKeys", func(t *testing.T) {
+			m := newMap()
+
+			// Load up the map.
+			for i, s := range testData {
+				expectMissing(t, s, 0)(m.Load(s))
+				expectStored(t, s, i)(m.LoadOrStore(s, i))
+			}
+			gmp := runtime.GOMAXPROCS(-1)
+			var wg sync.WaitGroup
+			for i := range gmp {
+				wg.Add(1)
+				go func(id int) {
+					defer wg.Done()
+
+					for i, s := range testData {
+						expectNotDeleted(t, s, math.MaxInt)(m.CompareAndDelete(s, math.MaxInt))
+						m.CompareAndDelete(s, i)
+						expectMissing(t, s, 0)(m.Load(s))
+					}
+					for _, s := range testData {
+						expectMissing(t, s, 0)(m.Load(s))
+					}
+				}(i)
+			}
+			wg.Wait()
+		})
+	})
+	t.Run("CompareAndSwap", func(t *testing.T) {
+		t.Run("All", func(t *testing.T) {
+			m := newMap()
+
+			for i, s := range testData {
+				expectMissing(t, s, 0)(m.Load(s))
+				expectStored(t, s, i)(m.LoadOrStore(s, i))
+				expectPresent(t, s, i)(m.Load(s))
+				expectLoaded(t, s, i)(m.LoadOrStore(s, 0))
+			}
+			for j := range 3 {
+				for i, s := range testData {
+					expectPresent(t, s, i+j)(m.Load(s))
+					expectNotSwapped(t, s, math.MaxInt, i+j+1)(m.CompareAndSwap(s, math.MaxInt, i+j+1))
+					expectSwapped(t, s, i, i+j+1)(m.CompareAndSwap(s, i+j, i+j+1))
+					expectNotSwapped(t, s, i+j, i+j+1)(m.CompareAndSwap(s, i+j, i+j+1))
+					expectPresent(t, s, i+j+1)(m.Load(s))
+				}
+			}
+			for i, s := range testData {
+				expectPresent(t, s, i+3)(m.Load(s))
+			}
+		})
+		t.Run("One", func(t *testing.T) {
+			m := newMap()
+
+			for i, s := range testData {
+				expectMissing(t, s, 0)(m.Load(s))
+				expectStored(t, s, i)(m.LoadOrStore(s, i))
+				expectPresent(t, s, i)(m.Load(s))
+				expectLoaded(t, s, i)(m.LoadOrStore(s, 0))
+			}
+			expectNotSwapped(t, testData[15], math.MaxInt, 16)(m.CompareAndSwap(testData[15], math.MaxInt, 16))
+			expectSwapped(t, testData[15], 15, 16)(m.CompareAndSwap(testData[15], 15, 16))
+			expectNotSwapped(t, testData[15], 15, 16)(m.CompareAndSwap(testData[15], 15, 16))
+			for i, s := range testData {
+				if i == 15 {
+					expectPresent(t, s, 16)(m.Load(s))
+				} else {
+					expectPresent(t, s, i)(m.Load(s))
+				}
+			}
+		})
+		t.Run("Multiple", func(t *testing.T) {
+			m := newMap()
+
+			for i, s := range testData {
+				expectMissing(t, s, 0)(m.Load(s))
+				expectStored(t, s, i)(m.LoadOrStore(s, i))
+				expectPresent(t, s, i)(m.Load(s))
+				expectLoaded(t, s, i)(m.LoadOrStore(s, 0))
+			}
+			for _, i := range []int{1, 105, 6, 85} {
+				expectNotSwapped(t, testData[i], math.MaxInt, i+1)(m.CompareAndSwap(testData[i], math.MaxInt, i+1))
+				expectSwapped(t, testData[i], i, i+1)(m.CompareAndSwap(testData[i], i, i+1))
+				expectNotSwapped(t, testData[i], i, i+1)(m.CompareAndSwap(testData[i], i, i+1))
+			}
+			for i, s := range testData {
+				if i == 1 || i == 105 || i == 6 || i == 85 {
+					expectPresent(t, s, i+1)(m.Load(s))
+				} else {
+					expectPresent(t, s, i)(m.Load(s))
+				}
+			}
+		})
+
+		t.Run("ConcurrentUnsharedKeys", func(t *testing.T) {
+			m := newMap()
+
+			gmp := runtime.GOMAXPROCS(-1)
+			var wg sync.WaitGroup
+			for i := range gmp {
+				wg.Add(1)
+				go func(id int) {
+					defer wg.Done()
+
+					makeKey := func(s string) string {
+						return s + "-" + strconv.Itoa(id)
+					}
+					for _, s := range testData {
+						key := makeKey(s)
+						expectMissing(t, key, 0)(m.Load(key))
+						expectStored(t, key, id)(m.LoadOrStore(key, id))
+						expectPresent(t, key, id)(m.Load(key))
+						expectLoaded(t, key, id)(m.LoadOrStore(key, 0))
+					}
+					for _, s := range testData {
+						key := makeKey(s)
+						expectPresent(t, key, id)(m.Load(key))
+						expectSwapped(t, key, id, id+1)(m.CompareAndSwap(key, id, id+1))
+						expectPresent(t, key, id+1)(m.Load(key))
+					}
+					for _, s := range testData {
+						key := makeKey(s)
+						expectPresent(t, key, id+1)(m.Load(key))
+					}
+				}(i)
+			}
+			wg.Wait()
+		})
+		t.Run("ConcurrentUnsharedKeysWithDelete", func(t *testing.T) {
+			m := newMap()
+
+			gmp := runtime.GOMAXPROCS(-1)
+			var wg sync.WaitGroup
+			for i := range gmp {
+				wg.Add(1)
+				go func(id int) {
+					defer wg.Done()
+
+					makeKey := func(s string) string {
+						return s + "-" + strconv.Itoa(id)
+					}
+					for _, s := range testData {
+						key := makeKey(s)
+						expectMissing(t, key, 0)(m.Load(key))
+						expectStored(t, key, id)(m.LoadOrStore(key, id))
+						expectPresent(t, key, id)(m.Load(key))
+						expectLoaded(t, key, id)(m.LoadOrStore(key, 0))
+					}
+					for _, s := range testData {
+						key := makeKey(s)
+						expectPresent(t, key, id)(m.Load(key))
+						expectSwapped(t, key, id, id+1)(m.CompareAndSwap(key, id, id+1))
+						expectPresent(t, key, id+1)(m.Load(key))
+						expectDeleted(t, key, id+1)(m.CompareAndDelete(key, id+1))
+						expectNotSwapped(t, key, id+1, id+2)(m.CompareAndSwap(key, id+1, id+2))
+						expectNotDeleted(t, key, id+1)(m.CompareAndDelete(key, id+1))
+						expectMissing(t, key, 0)(m.Load(key))
+					}
+					for _, s := range testData {
+						key := makeKey(s)
+						expectMissing(t, key, 0)(m.Load(key))
+					}
+				}(i)
+			}
+			wg.Wait()
+		})
+		t.Run("ConcurrentSharedKeys", func(t *testing.T) {
+			m := newMap()
+
+			// Load up the map.
+			for i, s := range testData {
+				expectMissing(t, s, 0)(m.Load(s))
+				expectStored(t, s, i)(m.LoadOrStore(s, i))
+			}
+			gmp := runtime.GOMAXPROCS(-1)
+			var wg sync.WaitGroup
+			for i := range gmp {
+				wg.Add(1)
+				go func(id int) {
+					defer wg.Done()
+
+					for i, s := range testData {
+						expectNotSwapped(t, s, math.MaxInt, i+1)(m.CompareAndSwap(s, math.MaxInt, i+1))
+						m.CompareAndSwap(s, i, i+1)
+						expectPresent(t, s, i+1)(m.Load(s))
+					}
+					for i, s := range testData {
+						expectPresent(t, s, i+1)(m.Load(s))
+					}
+				}(i)
+			}
+			wg.Wait()
+		})
+	})
+	t.Run("Swap", func(t *testing.T) {
+		t.Run("All", func(t *testing.T) {
+			m := newMap()
+
+			for i, s := range testData {
+				expectMissing(t, s, 0)(m.Load(s))
+				expectNotLoadedFromSwap(t, s, i)(m.Swap(s, i))
+				expectPresent(t, s, i)(m.Load(s))
+				expectLoadedFromSwap(t, s, i, i)(m.Swap(s, i))
+			}
+			for j := range 3 {
+				for i, s := range testData {
+					expectPresent(t, s, i+j)(m.Load(s))
+					expectLoadedFromSwap(t, s, i+j, i+j+1)(m.Swap(s, i+j+1))
+					expectPresent(t, s, i+j+1)(m.Load(s))
+				}
+			}
+			for i, s := range testData {
+				expectLoadedFromSwap(t, s, i+3, i+3)(m.Swap(s, i+3))
+			}
+		})
+		t.Run("One", func(t *testing.T) {
+			m := newMap()
+
+			for i, s := range testData {
+				expectMissing(t, s, 0)(m.Load(s))
+				expectNotLoadedFromSwap(t, s, i)(m.Swap(s, i))
+				expectPresent(t, s, i)(m.Load(s))
+				expectLoadedFromSwap(t, s, i, i)(m.Swap(s, i))
+			}
+			expectLoadedFromSwap(t, testData[15], 15, 16)(m.Swap(testData[15], 16))
+			for i, s := range testData {
+				if i == 15 {
+					expectPresent(t, s, 16)(m.Load(s))
+				} else {
+					expectPresent(t, s, i)(m.Load(s))
+				}
+			}
+		})
+		t.Run("Multiple", func(t *testing.T) {
+			m := newMap()
+
+			for i, s := range testData {
+				expectMissing(t, s, 0)(m.Load(s))
+				expectNotLoadedFromSwap(t, s, i)(m.Swap(s, i))
+				expectPresent(t, s, i)(m.Load(s))
+				expectLoadedFromSwap(t, s, i, i)(m.Swap(s, i))
+			}
+			for _, i := range []int{1, 105, 6, 85} {
+				expectLoadedFromSwap(t, testData[i], i, i+1)(m.Swap(testData[i], i+1))
+			}
+			for i, s := range testData {
+				if i == 1 || i == 105 || i == 6 || i == 85 {
+					expectPresent(t, s, i+1)(m.Load(s))
+				} else {
+					expectPresent(t, s, i)(m.Load(s))
+				}
+			}
+		})
+		t.Run("ConcurrentUnsharedKeys", func(t *testing.T) {
+			m := newMap()
+
+			gmp := runtime.GOMAXPROCS(-1)
+			var wg sync.WaitGroup
+			for i := range gmp {
+				wg.Add(1)
+				go func(id int) {
+					defer wg.Done()
+
+					makeKey := func(s string) string {
+						return s + "-" + strconv.Itoa(id)
+					}
+					for _, s := range testData {
+						key := makeKey(s)
+						expectMissing(t, key, 0)(m.Load(key))
+						expectNotLoadedFromSwap(t, key, id)(m.Swap(key, id))
+						expectPresent(t, key, id)(m.Load(key))
+						expectLoadedFromSwap(t, key, id, id)(m.Swap(key, id))
+					}
+					for _, s := range testData {
+						key := makeKey(s)
+						expectPresent(t, key, id)(m.Load(key))
+						expectLoadedFromSwap(t, key, id, id+1)(m.Swap(key, id+1))
+						expectPresent(t, key, id+1)(m.Load(key))
+					}
+					for _, s := range testData {
+						key := makeKey(s)
+						expectPresent(t, key, id+1)(m.Load(key))
+					}
+				}(i)
+			}
+			wg.Wait()
+		})
+		t.Run("ConcurrentUnsharedKeysWithDelete", func(t *testing.T) {
+			m := newMap()
+
+			gmp := runtime.GOMAXPROCS(-1)
+			var wg sync.WaitGroup
+			for i := range gmp {
+				wg.Add(1)
+				go func(id int) {
+					defer wg.Done()
+
+					makeKey := func(s string) string {
+						return s + "-" + strconv.Itoa(id)
+					}
+					for _, s := range testData {
+						key := makeKey(s)
+						expectMissing(t, key, 0)(m.Load(key))
+						expectNotLoadedFromSwap(t, key, id)(m.Swap(key, id))
+						expectPresent(t, key, id)(m.Load(key))
+						expectLoadedFromSwap(t, key, id, id)(m.Swap(key, id))
+					}
+					for _, s := range testData {
+						key := makeKey(s)
+						expectPresent(t, key, id)(m.Load(key))
+						expectLoadedFromSwap(t, key, id, id+1)(m.Swap(key, id+1))
+						expectPresent(t, key, id+1)(m.Load(key))
+						expectDeleted(t, key, id+1)(m.CompareAndDelete(key, id+1))
+						expectNotLoadedFromSwap(t, key, id+2)(m.Swap(key, id+2))
+						expectPresent(t, key, id+2)(m.Load(key))
+					}
+					for _, s := range testData {
+						key := makeKey(s)
+						expectPresent(t, key, id+2)(m.Load(key))
+					}
+				}(i)
+			}
+			wg.Wait()
+		})
+		t.Run("ConcurrentSharedKeys", func(t *testing.T) {
+			m := newMap()
+
+			// Load up the map.
+			for i, s := range testData {
+				expectMissing(t, s, 0)(m.Load(s))
+				expectStored(t, s, i)(m.LoadOrStore(s, i))
+			}
+			gmp := runtime.GOMAXPROCS(-1)
+			var wg sync.WaitGroup
+			for i := range gmp {
+				wg.Add(1)
+				go func(id int) {
+					defer wg.Done()
+
+					for i, s := range testData {
+						m.Swap(s, i+1)
+						expectPresent(t, s, i+1)(m.Load(s))
+					}
+					for i, s := range testData {
+						expectPresent(t, s, i+1)(m.Load(s))
+					}
+				}(i)
+			}
+			wg.Wait()
+		})
+	})
+	t.Run("LoadAndDelete", func(t *testing.T) {
+		t.Run("All", func(t *testing.T) {
+			m := newMap()
+
+			for range 3 {
+				for i, s := range testData {
+					expectMissing(t, s, 0)(m.Load(s))
+					expectStored(t, s, i)(m.LoadOrStore(s, i))
+					expectPresent(t, s, i)(m.Load(s))
+					expectLoaded(t, s, i)(m.LoadOrStore(s, 0))
+				}
+				for i, s := range testData {
+					expectPresent(t, s, i)(m.Load(s))
+					expectLoadedFromDelete(t, s, i)(m.LoadAndDelete(s))
+					expectMissing(t, s, 0)(m.Load(s))
+					expectNotLoadedFromDelete(t, s, 0)(m.LoadAndDelete(s))
+				}
+				for _, s := range testData {
+					expectMissing(t, s, 0)(m.Load(s))
+				}
+			}
+		})
+		t.Run("One", func(t *testing.T) {
+			m := newMap()
+
+			for i, s := range testData {
+				expectMissing(t, s, 0)(m.Load(s))
+				expectStored(t, s, i)(m.LoadOrStore(s, i))
+				expectPresent(t, s, i)(m.Load(s))
+				expectLoaded(t, s, i)(m.LoadOrStore(s, 0))
+			}
+			expectPresent(t, testData[15], 15)(m.Load(testData[15]))
+			expectLoadedFromDelete(t, testData[15], 15)(m.LoadAndDelete(testData[15]))
+			expectMissing(t, testData[15], 0)(m.Load(testData[15]))
+			expectNotLoadedFromDelete(t, testData[15], 0)(m.LoadAndDelete(testData[15]))
+			for i, s := range testData {
+				if i == 15 {
+					expectMissing(t, s, 0)(m.Load(s))
+				} else {
+					expectPresent(t, s, i)(m.Load(s))
+				}
+			}
+		})
+		t.Run("Multiple", func(t *testing.T) {
+			m := newMap()
+
+			for i, s := range testData {
+				expectMissing(t, s, 0)(m.Load(s))
+				expectStored(t, s, i)(m.LoadOrStore(s, i))
+				expectPresent(t, s, i)(m.Load(s))
+				expectLoaded(t, s, i)(m.LoadOrStore(s, 0))
+			}
+			for _, i := range []int{1, 105, 6, 85} {
+				expectPresent(t, testData[i], i)(m.Load(testData[i]))
+				expectLoadedFromDelete(t, testData[i], i)(m.LoadAndDelete(testData[i]))
+				expectMissing(t, testData[i], 0)(m.Load(testData[i]))
+				expectNotLoadedFromDelete(t, testData[i], 0)(m.LoadAndDelete(testData[i]))
+			}
+			for i, s := range testData {
+				if i == 1 || i == 105 || i == 6 || i == 85 {
+					expectMissing(t, s, 0)(m.Load(s))
+				} else {
+					expectPresent(t, s, i)(m.Load(s))
+				}
+			}
+		})
+		t.Run("Iterate", func(t *testing.T) {
+			m := newMap()
+
+			testAll(t, m, testDataMap(testData[:]), func(s string, i int) bool {
+				expectLoadedFromDelete(t, s, i)(m.LoadAndDelete(s))
+				return true
+			})
+			for _, s := range testData {
+				expectMissing(t, s, 0)(m.Load(s))
+			}
+		})
+		t.Run("ConcurrentUnsharedKeys", func(t *testing.T) {
+			m := newMap()
+
+			gmp := runtime.GOMAXPROCS(-1)
+			var wg sync.WaitGroup
+			for i := range gmp {
+				wg.Add(1)
+				go func(id int) {
+					defer wg.Done()
+
+					makeKey := func(s string) string {
+						return s + "-" + strconv.Itoa(id)
+					}
+					for _, s := range testData {
+						key := makeKey(s)
+						expectMissing(t, key, 0)(m.Load(key))
+						expectStored(t, key, id)(m.LoadOrStore(key, id))
+						expectPresent(t, key, id)(m.Load(key))
+						expectLoaded(t, key, id)(m.LoadOrStore(key, 0))
+					}
+					for _, s := range testData {
+						key := makeKey(s)
+						expectPresent(t, key, id)(m.Load(key))
+						expectLoadedFromDelete(t, key, id)(m.LoadAndDelete(key))
+						expectMissing(t, key, 0)(m.Load(key))
+					}
+					for _, s := range testData {
+						key := makeKey(s)
+						expectMissing(t, key, 0)(m.Load(key))
+					}
+				}(i)
+			}
+			wg.Wait()
+		})
+		t.Run("ConcurrentSharedKeys", func(t *testing.T) {
+			m := newMap()
+
+			// Load up the map.
+			for i, s := range testData {
+				expectMissing(t, s, 0)(m.Load(s))
+				expectStored(t, s, i)(m.LoadOrStore(s, i))
+			}
+			gmp := runtime.GOMAXPROCS(-1)
+			var wg sync.WaitGroup
+			for i := range gmp {
+				wg.Add(1)
+				go func(id int) {
+					defer wg.Done()
+
+					for _, s := range testData {
+						m.LoadAndDelete(s)
+						expectMissing(t, s, 0)(m.Load(s))
+					}
+					for _, s := range testData {
+						expectMissing(t, s, 0)(m.Load(s))
+					}
+				}(i)
+			}
+			wg.Wait()
+		})
+	})
+}
+
+func testAll[K, V comparable](t *testing.T, m *isync.HashTrieMap[K, V], testData map[K]V, yield func(K, V) bool) {
+	for k, v := range testData {
+		expectStored(t, k, v)(m.LoadOrStore(k, v))
+	}
+	visited := make(map[K]int)
+	m.All()(func(key K, got V) bool {
+		want, ok := testData[key]
+		if !ok {
+			t.Errorf("unexpected key %v in map", key)
+			return false
+		}
+		if got != want {
+			t.Errorf("expected key %v to have value %v, got %v", key, want, got)
+			return false
+		}
+		visited[key]++
+		return yield(key, got)
+	})
+	for key, n := range visited {
+		if n > 1 {
+			t.Errorf("visited key %v more than once", key)
+		}
+	}
+}
+
+func expectPresent[K, V comparable](t *testing.T, key K, want V) func(got V, ok bool) {
+	t.Helper()
+	return func(got V, ok bool) {
+		t.Helper()
+
+		if !ok {
+			t.Errorf("expected key %v to be present in map", key)
+		}
+		if ok && got != want {
+			t.Errorf("expected key %v to have value %v, got %v", key, want, got)
+		}
+	}
+}
+
+func expectMissing[K, V comparable](t *testing.T, key K, want V) func(got V, ok bool) {
+	t.Helper()
+	if want != *new(V) {
+		// This is awkward, but the want argument is necessary to smooth over type inference.
+		// Just make sure the want argument always looks the same.
+		panic("expectMissing must always have a zero value variable")
+	}
+	return func(got V, ok bool) {
+		t.Helper()
+
+		if ok {
+			t.Errorf("expected key %v to be missing from map, got value %v", key, got)
+		}
+		if !ok && got != want {
+			t.Errorf("expected missing key %v to be paired with the zero value; got %v", key, got)
+		}
+	}
+}
+
+func expectLoaded[K, V comparable](t *testing.T, key K, want V) func(got V, loaded bool) {
+	t.Helper()
+	return func(got V, loaded bool) {
+		t.Helper()
+
+		if !loaded {
+			t.Errorf("expected key %v to have been loaded, not stored", key)
+		}
+		if got != want {
+			t.Errorf("expected key %v to have value %v, got %v", key, want, got)
+		}
+	}
+}
+
+func expectStored[K, V comparable](t *testing.T, key K, want V) func(got V, loaded bool) {
+	t.Helper()
+	return func(got V, loaded bool) {
+		t.Helper()
+
+		if loaded {
+			t.Errorf("expected inserted key %v to have been stored, not loaded", key)
+		}
+		if got != want {
+			t.Errorf("expected inserted key %v to have value %v, got %v", key, want, got)
+		}
+	}
+}
+
+func expectDeleted[K, V comparable](t *testing.T, key K, old V) func(deleted bool) {
+	t.Helper()
+	return func(deleted bool) {
+		t.Helper()
+
+		if !deleted {
+			t.Errorf("expected key %v with value %v to be in map and deleted", key, old)
+		}
+	}
+}
+
+func expectNotDeleted[K, V comparable](t *testing.T, key K, old V) func(deleted bool) {
+	t.Helper()
+	return func(deleted bool) {
+		t.Helper()
+
+		if deleted {
+			t.Errorf("expected key %v with value %v to not be in map and thus not deleted", key, old)
+		}
+	}
+}
+
+func expectSwapped[K, V comparable](t *testing.T, key K, old, new V) func(swapped bool) {
+	t.Helper()
+	return func(swapped bool) {
+		t.Helper()
+
+		if !swapped {
+			t.Errorf("expected key %v with value %v to be in map and swapped for %v", key, old, new)
+		}
+	}
+}
+
+func expectNotSwapped[K, V comparable](t *testing.T, key K, old, new V) func(swapped bool) {
+	t.Helper()
+	return func(swapped bool) {
+		t.Helper()
+
+		if swapped {
+			t.Errorf("expected key %v with value %v to not be in map or not swapped for %v", key, old, new)
+		}
+	}
+}
+
+func expectLoadedFromSwap[K, V comparable](t *testing.T, key K, want, new V) func(got V, loaded bool) {
+	t.Helper()
+	return func(got V, loaded bool) {
+		t.Helper()
+
+		if !loaded {
+			t.Errorf("expected key %v to be in map and for %v to have been swapped for %v", key, want, new)
+		} else if want != got {
+			t.Errorf("key %v had its value %v swapped for %v, but expected it to have value %v", key, got, new, want)
+		}
+	}
+}
+
+func expectNotLoadedFromSwap[K, V comparable](t *testing.T, key K, new V) func(old V, loaded bool) {
+	t.Helper()
+	return func(old V, loaded bool) {
+		t.Helper()
+
+		if loaded {
+			t.Errorf("expected key %v to not be in map, but found value %v for it", key, old)
+		}
+	}
+}
+
+func expectLoadedFromDelete[K, V comparable](t *testing.T, key K, want V) func(got V, loaded bool) {
+	t.Helper()
+	return func(got V, loaded bool) {
+		t.Helper()
+
+		if !loaded {
+			t.Errorf("expected key %v to be in map to be deleted", key)
+		} else if want != got {
+			t.Errorf("key %v was deleted with value %v, but expected it to have value %v", key, got, want)
+		}
+	}
+}
+
+func expectNotLoadedFromDelete[K, V comparable](t *testing.T, key K, _ V) func(old V, loaded bool) {
+	t.Helper()
+	return func(old V, loaded bool) {
+		t.Helper()
+
+		if loaded {
+			t.Errorf("expected key %v to not be in map, but found value %v for it", key, old)
+		}
+	}
+}
+
+func testDataMap(data []string) map[string]int {
+	m := make(map[string]int)
+	for i, s := range data {
+		m[s] = i
+	}
+	return m
+}
+
+var (
+	testDataSmall [8]string
+	testData      [128]string
+	testDataLarge [128 << 10]string
+)
+
+func init() {
+	for i := range testDataSmall {
+		testDataSmall[i] = fmt.Sprintf("%b", i)
+	}
+	for i := range testData {
+		testData[i] = fmt.Sprintf("%b", i)
+	}
+	for i := range testDataLarge {
+		testDataLarge[i] = fmt.Sprintf("%b", i)
+	}
+}
+
+// TestConcurrentCache tests HashTrieMap in a scenario where it is used as
+// the basis of a memory-efficient concurrent cache. We're specifically
+// looking to make sure that CompareAndSwap and CompareAndDelete are
+// atomic with respect to one another. When competing for the same
+// key-value pair, they must not both succeed.
+//
+// This test is a regression test for issue #70970.
+func TestConcurrentCache(t *testing.T) {
+	type dummy [32]byte
+
+	var m isync.HashTrieMap[int, weak.Pointer[dummy]]
+
+	type cleanupArg struct {
+		key   int
+		value weak.Pointer[dummy]
+	}
+	cleanup := func(arg cleanupArg) {
+		m.CompareAndDelete(arg.key, arg.value)
+	}
+	get := func(m *isync.HashTrieMap[int, weak.Pointer[dummy]], key int) *dummy {
+		nv := new(dummy)
+		nw := weak.Make(nv)
+		for {
+			w, loaded := m.LoadOrStore(key, nw)
+			if !loaded {
+				runtime.AddCleanup(nv, cleanup, cleanupArg{key, nw})
+				return nv
+			}
+			if v := w.Value(); v != nil {
+				return v
+			}
+
+			// Weak pointer was reclaimed, try to replace it with nw.
+			if m.CompareAndSwap(key, w, nw) {
+				runtime.AddCleanup(nv, cleanup, cleanupArg{key, nw})
+				return nv
+			}
+		}
+	}
+
+	const N = 100_000
+	const P = 5_000
+
+	var wg sync.WaitGroup
+	wg.Add(N)
+	for i := range N {
+		go func() {
+			defer wg.Done()
+			a := get(&m, i%P)
+			b := get(&m, i%P)
+			if a != b {
+				t.Errorf("consecutive cache reads returned different values: a != b (%p vs %p)\n", a, b)
+			}
+		}()
+	}
+	wg.Wait()
+}
diff --git a/src/internal/sync/mutex.go b/src/internal/sync/mutex.go
new file mode 100644
index 00000000..c0c526a7
--- /dev/null
+++ b/src/internal/sync/mutex.go
@@ -0,0 +1,234 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package sync provides basic synchronization primitives such as mutual
+// exclusion locks to internal packages (including ones that depend on sync).
+//
+// Tests are defined in package [sync].
+package sync
+
+import (
+	"internal/race"
+	"sync/atomic"
+	"unsafe"
+)
+
+// A Mutex is a mutual exclusion lock.
+//
+// See package [sync.Mutex] documentation.
+type Mutex struct {
+	state int32
+	sema  uint32
+}
+
+const (
+	mutexLocked = 1 << iota // mutex is locked
+	mutexWoken
+	mutexStarving
+	mutexWaiterShift = iota
+
+	// Mutex fairness.
+	//
+	// Mutex can be in 2 modes of operations: normal and starvation.
+	// In normal mode waiters are queued in FIFO order, but a woken up waiter
+	// does not own the mutex and competes with new arriving goroutines over
+	// the ownership. New arriving goroutines have an advantage -- they are
+	// already running on CPU and there can be lots of them, so a woken up
+	// waiter has good chances of losing. In such case it is queued at front
+	// of the wait queue. If a waiter fails to acquire the mutex for more than 1ms,
+	// it switches mutex to the starvation mode.
+	//
+	// In starvation mode ownership of the mutex is directly handed off from
+	// the unlocking goroutine to the waiter at the front of the queue.
+	// New arriving goroutines don't try to acquire the mutex even if it appears
+	// to be unlocked, and don't try to spin. Instead they queue themselves at
+	// the tail of the wait queue.
+	//
+	// If a waiter receives ownership of the mutex and sees that either
+	// (1) it is the last waiter in the queue, or (2) it waited for less than 1 ms,
+	// it switches mutex back to normal operation mode.
+	//
+	// Normal mode has considerably better performance as a goroutine can acquire
+	// a mutex several times in a row even if there are blocked waiters.
+	// Starvation mode is important to prevent pathological cases of tail latency.
+	starvationThresholdNs = 1e6
+)
+
+// Lock locks m.
+//
+// See package [sync.Mutex] documentation.
+func (m *Mutex) Lock() {
+	// Fast path: grab unlocked mutex.
+	if atomic.CompareAndSwapInt32(&m.state, 0, mutexLocked) {
+		if race.Enabled {
+			race.Acquire(unsafe.Pointer(m))
+		}
+		return
+	}
+	// Slow path (outlined so that the fast path can be inlined)
+	m.lockSlow()
+}
+
+// TryLock tries to lock m and reports whether it succeeded.
+//
+// See package [sync.Mutex] documentation.
+func (m *Mutex) TryLock() bool {
+	old := m.state
+	if old&(mutexLocked|mutexStarving) != 0 {
+		return false
+	}
+
+	// There may be a goroutine waiting for the mutex, but we are
+	// running now and can try to grab the mutex before that
+	// goroutine wakes up.
+	if !atomic.CompareAndSwapInt32(&m.state, old, old|mutexLocked) {
+		return false
+	}
+
+	if race.Enabled {
+		race.Acquire(unsafe.Pointer(m))
+	}
+	return true
+}
+
+func (m *Mutex) lockSlow() {
+	var waitStartTime int64
+	starving := false
+	awoke := false
+	iter := 0
+	old := m.state
+	for {
+		// Don't spin in starvation mode, ownership is handed off to waiters
+		// so we won't be able to acquire the mutex anyway.
+		if old&(mutexLocked|mutexStarving) == mutexLocked && runtime_canSpin(iter) {
+			// Active spinning makes sense.
+			// Try to set mutexWoken flag to inform Unlock
+			// to not wake other blocked goroutines.
+			if !awoke && old&mutexWoken == 0 && old>>mutexWaiterShift != 0 &&
+				atomic.CompareAndSwapInt32(&m.state, old, old|mutexWoken) {
+				awoke = true
+			}
+			runtime_doSpin()
+			iter++
+			old = m.state
+			continue
+		}
+		new := old
+		// Don't try to acquire starving mutex, new arriving goroutines must queue.
+		if old&mutexStarving == 0 {
+			new |= mutexLocked
+		}
+		if old&(mutexLocked|mutexStarving) != 0 {
+			new += 1 << mutexWaiterShift
+		}
+		// The current goroutine switches mutex to starvation mode.
+		// But if the mutex is currently unlocked, don't do the switch.
+		// Unlock expects that starving mutex has waiters, which will not
+		// be true in this case.
+		if starving && old&mutexLocked != 0 {
+			new |= mutexStarving
+		}
+		if awoke {
+			// The goroutine has been woken from sleep,
+			// so we need to reset the flag in either case.
+			if new&mutexWoken == 0 {
+				throw("sync: inconsistent mutex state")
+			}
+			new &^= mutexWoken
+		}
+		if atomic.CompareAndSwapInt32(&m.state, old, new) {
+			if old&(mutexLocked|mutexStarving) == 0 {
+				break // locked the mutex with CAS
+			}
+			// If we were already waiting before, queue at the front of the queue.
+			queueLifo := waitStartTime != 0
+			if waitStartTime == 0 {
+				waitStartTime = runtime_nanotime()
+			}
+			runtime_SemacquireMutex(&m.sema, queueLifo, 2)
+			starving = starving || runtime_nanotime()-waitStartTime > starvationThresholdNs
+			old = m.state
+			if old&mutexStarving != 0 {
+				// If this goroutine was woken and mutex is in starvation mode,
+				// ownership was handed off to us but mutex is in somewhat
+				// inconsistent state: mutexLocked is not set and we are still
+				// accounted as waiter. Fix that.
+				if old&(mutexLocked|mutexWoken) != 0 || old>>mutexWaiterShift == 0 {
+					throw("sync: inconsistent mutex state")
+				}
+				delta := int32(mutexLocked - 1<>mutexWaiterShift == 1 {
+					// Exit starvation mode.
+					// Critical to do it here and consider wait time.
+					// Starvation mode is so inefficient, that two goroutines
+					// can go lock-step infinitely once they switch mutex
+					// to starvation mode.
+					delta -= mutexStarving
+				}
+				atomic.AddInt32(&m.state, delta)
+				break
+			}
+			awoke = true
+			iter = 0
+		} else {
+			old = m.state
+		}
+	}
+
+	if race.Enabled {
+		race.Acquire(unsafe.Pointer(m))
+	}
+}
+
+// Unlock unlocks m.
+//
+// See package [sync.Mutex] documentation.
+func (m *Mutex) Unlock() {
+	if race.Enabled {
+		_ = m.state
+		race.Release(unsafe.Pointer(m))
+	}
+
+	// Fast path: drop lock bit.
+	new := atomic.AddInt32(&m.state, -mutexLocked)
+	if new != 0 {
+		// Outlined slow path to allow inlining the fast path.
+		// To hide unlockSlow during tracing we skip one extra frame when tracing GoUnblock.
+		m.unlockSlow(new)
+	}
+}
+
+func (m *Mutex) unlockSlow(new int32) {
+	if (new+mutexLocked)&mutexLocked == 0 {
+		fatal("sync: unlock of unlocked mutex")
+	}
+	if new&mutexStarving == 0 {
+		old := new
+		for {
+			// If there are no waiters or a goroutine has already
+			// been woken or grabbed the lock, no need to wake anyone.
+			// In starvation mode ownership is directly handed off from unlocking
+			// goroutine to the next waiter. We are not part of this chain,
+			// since we did not observe mutexStarving when we unlocked the mutex above.
+			// So get off the way.
+			if old>>mutexWaiterShift == 0 || old&(mutexLocked|mutexWoken|mutexStarving) != 0 {
+				return
+			}
+			// Grab the right to wake someone.
+			new = (old - 1<= 3 {
+					break
+				}
+			}
+		}()
+		want := []time.Time{
+			time.Now(),
+			time.Now().Add(1 * time.Second),
+			time.Now().Add(2 * time.Second),
+		}
+		time.Sleep(5 * time.Second)
+		synctest.Wait()
+		if !slices.Equal(got, want) {
+			t.Errorf("got: %v; want: %v", got, want)
+		}
+	})
+}
+
+func TestIteratorPull(t *testing.T) {
+	synctest.Run(func() {
+		seq := func(yield func(time.Time) bool) {
+			for yield(time.Now()) {
+				time.Sleep(1 * time.Second)
+			}
+		}
+		var got []time.Time
+		go func() {
+			next, stop := iter.Pull(seq)
+			defer stop()
+			for len(got) < 3 {
+				now, _ := next()
+				got = append(got, now)
+			}
+		}()
+		want := []time.Time{
+			time.Now(),
+			time.Now().Add(1 * time.Second),
+			time.Now().Add(2 * time.Second),
+		}
+		time.Sleep(5 * time.Second)
+		synctest.Wait()
+		if !slices.Equal(got, want) {
+			t.Errorf("got: %v; want: %v", got, want)
+		}
+	})
+}
+
+func TestReflectFuncOf(t *testing.T) {
+	mkfunc := func(name string, i int) {
+		reflect.FuncOf([]reflect.Type{
+			reflect.StructOf([]reflect.StructField{{
+				Name: name + strconv.Itoa(i),
+				Type: reflect.TypeOf(0),
+			}}),
+		}, nil, false)
+	}
+	go func() {
+		for i := 0; i < 100000; i++ {
+			mkfunc("A", i)
+		}
+	}()
+	synctest.Run(func() {
+		for i := 0; i < 100000; i++ {
+			mkfunc("A", i)
+		}
+	})
+}
+
+func TestWaitGroup(t *testing.T) {
+	synctest.Run(func() {
+		var wg sync.WaitGroup
+		wg.Add(1)
+		const delay = 1 * time.Second
+		go func() {
+			time.Sleep(delay)
+			wg.Done()
+		}()
+		start := time.Now()
+		wg.Wait()
+		if got := time.Since(start); got != delay {
+			t.Fatalf("WaitGroup.Wait() took %v, want %v", got, delay)
+		}
+	})
+}
+
+func wantPanic(t *testing.T, want string) {
+	if e := recover(); e != nil {
+		if got := fmt.Sprint(e); got != want {
+			t.Errorf("got panic message %q, want %q", got, want)
+		}
+	} else {
+		t.Errorf("got no panic, want one")
+	}
+}
diff --git a/src/internal/syscall/unix/getentropy_netbsd.go b/src/internal/syscall/unix/arandom_netbsd.go
similarity index 93%
rename from src/internal/syscall/unix/getentropy_netbsd.go
rename to src/internal/syscall/unix/arandom_netbsd.go
index 02bac1be..23ca8739 100644
--- a/src/internal/syscall/unix/getentropy_netbsd.go
+++ b/src/internal/syscall/unix/arandom_netbsd.go
@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build netbsd
-
 package unix
 
 import (
@@ -17,7 +15,7 @@ const (
 	_KERN_ARND = 81
 )
 
-func GetEntropy(p []byte) error {
+func Arandom(p []byte) error {
 	mib := [2]uint32{_CTL_KERN, _KERN_ARND}
 	n := uintptr(len(p))
 	_, _, errno := syscall.Syscall6(
diff --git a/src/internal/syscall/unix/arc4random_openbsd.go b/src/internal/syscall/unix/arc4random_openbsd.go
new file mode 100644
index 00000000..652e0cb1
--- /dev/null
+++ b/src/internal/syscall/unix/arc4random_openbsd.go
@@ -0,0 +1,23 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package unix
+
+import (
+	"internal/abi"
+	"syscall"
+	"unsafe"
+)
+
+//go:linkname syscall_syscall syscall.syscall
+func syscall_syscall(fn, a1, a2, a3 uintptr) (r1, r2 uintptr, err syscall.Errno)
+
+//go:cgo_import_dynamic libc_arc4random_buf arc4random_buf "libc.so"
+
+func libc_arc4random_buf_trampoline()
+
+func ARC4Random(p []byte) {
+	syscall_syscall(abi.FuncPCABI0(libc_arc4random_buf_trampoline),
+		uintptr(unsafe.Pointer(unsafe.SliceData(p))), uintptr(len(p)), 0)
+}
diff --git a/src/internal/syscall/unix/asm_darwin.s b/src/internal/syscall/unix/asm_darwin.s
index 99f28765..b96eb1e8 100644
--- a/src/internal/syscall/unix/asm_darwin.s
+++ b/src/internal/syscall/unix/asm_darwin.s
@@ -23,3 +23,5 @@ TEXT ·libc_getgrnam_r_trampoline(SB),NOSPLIT,$0-0; JMP libc_getgrnam_r(SB)
 TEXT ·libc_getgrgid_r_trampoline(SB),NOSPLIT,$0-0; JMP libc_getgrgid_r(SB)
 TEXT ·libc_sysconf_trampoline(SB),NOSPLIT,$0-0; JMP libc_sysconf(SB)
 TEXT ·libc_faccessat_trampoline(SB),NOSPLIT,$0-0; JMP libc_faccessat(SB)
+TEXT ·libc_readlinkat_trampoline(SB),NOSPLIT,$0-0; JMP libc_readlinkat(SB)
+TEXT ·libc_mkdirat_trampoline(SB),NOSPLIT,$0-0; JMP libc_mkdirat(SB)
diff --git a/src/internal/syscall/unix/asm_openbsd.s b/src/internal/syscall/unix/asm_openbsd.s
index cc54a14c..90f6831e 100644
--- a/src/internal/syscall/unix/asm_openbsd.s
+++ b/src/internal/syscall/unix/asm_openbsd.s
@@ -8,3 +8,9 @@
 
 TEXT ·libc_faccessat_trampoline(SB),NOSPLIT,$0-0
         JMP	libc_faccessat(SB)
+TEXT ·libc_arc4random_buf_trampoline(SB),NOSPLIT,$0-0
+        JMP	libc_arc4random_buf(SB)
+TEXT ·libc_readlinkat_trampoline(SB),NOSPLIT,$0-0
+        JMP	libc_readlinkat(SB)
+TEXT ·libc_mkdirat_trampoline(SB),NOSPLIT,$0-0
+        JMP	libc_mkdirat(SB)
diff --git a/src/internal/syscall/unix/at.go b/src/internal/syscall/unix/at.go
index cfb6e410..27a798e0 100644
--- a/src/internal/syscall/unix/at.go
+++ b/src/internal/syscall/unix/at.go
@@ -38,3 +38,44 @@ func Openat(dirfd int, path string, flags int, perm uint32) (int, error) {
 
 	return int(fd), nil
 }
+
+func Readlinkat(dirfd int, path string, buf []byte) (int, error) {
+	p0, err := syscall.BytePtrFromString(path)
+	if err != nil {
+		return 0, err
+	}
+	var p1 unsafe.Pointer
+	if len(buf) > 0 {
+		p1 = unsafe.Pointer(&buf[0])
+	} else {
+		p1 = unsafe.Pointer(&_zero)
+	}
+	n, _, errno := syscall.Syscall6(readlinkatTrap,
+		uintptr(dirfd),
+		uintptr(unsafe.Pointer(p0)),
+		uintptr(p1),
+		uintptr(len(buf)),
+		0, 0)
+	if errno != 0 {
+		return 0, errno
+	}
+
+	return int(n), nil
+}
+
+func Mkdirat(dirfd int, path string, mode uint32) error {
+	p, err := syscall.BytePtrFromString(path)
+	if err != nil {
+		return err
+	}
+
+	_, _, errno := syscall.Syscall6(mkdiratTrap,
+		uintptr(dirfd),
+		uintptr(unsafe.Pointer(p)),
+		uintptr(mode),
+		0, 0, 0)
+	if errno != 0 {
+		return errno
+	}
+	return nil
+}
diff --git a/src/internal/syscall/unix/at_aix.go b/src/internal/syscall/unix/at_aix.go
index 3fe3285c..5c2f00ef 100644
--- a/src/internal/syscall/unix/at_aix.go
+++ b/src/internal/syscall/unix/at_aix.go
@@ -7,8 +7,12 @@ package unix
 //go:cgo_import_dynamic libc_fstatat fstatat "libc.a/shr_64.o"
 //go:cgo_import_dynamic libc_openat openat "libc.a/shr_64.o"
 //go:cgo_import_dynamic libc_unlinkat unlinkat "libc.a/shr_64.o"
+//go:cgo_import_dynamic libc_readlinkat readlinkat "libc.a/shr_64.o"
+//go:cgo_import_dynamic libc_mkdirat mkdirat "libc.a/shr_64.o"
 
 const (
+	AT_EACCESS          = 0x1
+	AT_FDCWD            = -0x02
 	AT_REMOVEDIR        = 0x1
 	AT_SYMLINK_NOFOLLOW = 0x1
 	UTIME_OMIT          = -0x3
diff --git a/src/internal/syscall/unix/at_darwin.go b/src/internal/syscall/unix/at_darwin.go
new file mode 100644
index 00000000..dbcae5a7
--- /dev/null
+++ b/src/internal/syscall/unix/at_darwin.go
@@ -0,0 +1,60 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build darwin
+
+package unix
+
+import (
+	"internal/abi"
+	"syscall"
+	"unsafe"
+)
+
+func libc_readlinkat_trampoline()
+
+//go:cgo_import_dynamic libc_readlinkat readlinkat "/usr/lib/libSystem.B.dylib"
+
+func Readlinkat(dirfd int, path string, buf []byte) (int, error) {
+	p0, err := syscall.BytePtrFromString(path)
+	if err != nil {
+		return 0, err
+	}
+	var p1 unsafe.Pointer
+	if len(buf) > 0 {
+		p1 = unsafe.Pointer(&buf[0])
+	} else {
+		p1 = unsafe.Pointer(&_zero)
+	}
+	n, _, errno := syscall_syscall6(abi.FuncPCABI0(libc_readlinkat_trampoline),
+		uintptr(dirfd),
+		uintptr(unsafe.Pointer(p0)),
+		uintptr(p1),
+		uintptr(len(buf)),
+		0,
+		0)
+	if errno != 0 {
+		return 0, errno
+	}
+	return int(n), nil
+}
+
+func libc_mkdirat_trampoline()
+
+//go:cgo_import_dynamic libc_mkdirat mkdirat "/usr/lib/libSystem.B.dylib"
+
+func Mkdirat(dirfd int, path string, mode uint32) error {
+	p, err := syscall.BytePtrFromString(path)
+	if err != nil {
+		return err
+	}
+	_, _, errno := syscall_syscall(abi.FuncPCABI0(libc_mkdirat_trampoline),
+		uintptr(dirfd),
+		uintptr(unsafe.Pointer(p)),
+		uintptr(mode))
+	if errno != 0 {
+		return errno
+	}
+	return nil
+}
diff --git a/src/internal/syscall/unix/at_fstatat.go b/src/internal/syscall/unix/at_fstatat.go
index 25de336a..18cd62be 100644
--- a/src/internal/syscall/unix/at_fstatat.go
+++ b/src/internal/syscall/unix/at_fstatat.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build dragonfly || (linux && !loong64) || netbsd || (openbsd && mips64)
+//go:build dragonfly || (linux && !(loong64 || mips64 || mips64le)) || netbsd || (openbsd && mips64)
 
 package unix
 
diff --git a/src/internal/syscall/unix/at_fstatat2.go b/src/internal/syscall/unix/at_fstatat2.go
index 8d20e1a8..b09aecbc 100644
--- a/src/internal/syscall/unix/at_fstatat2.go
+++ b/src/internal/syscall/unix/at_fstatat2.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build freebsd || (linux && loong64)
+//go:build freebsd || (linux && (loong64 || mips64 || mips64le))
 
 package unix
 
diff --git a/src/internal/syscall/unix/at_libc.go b/src/internal/syscall/unix/at_libc.go
index f48d3791..faf38be6 100644
--- a/src/internal/syscall/unix/at_libc.go
+++ b/src/internal/syscall/unix/at_libc.go
@@ -14,11 +14,15 @@ import (
 //go:linkname procFstatat libc_fstatat
 //go:linkname procOpenat libc_openat
 //go:linkname procUnlinkat libc_unlinkat
+//go:linkname procReadlinkat libc_readlinkat
+//go:linkname procMkdirat libc_mkdirat
 
 var (
 	procFstatat,
 	procOpenat,
-	procUnlinkat uintptr
+	procUnlinkat,
+	procReadlinkat,
+	procMkdirat uintptr
 )
 
 func Unlinkat(dirfd int, path string, flags int) error {
@@ -62,3 +66,44 @@ func Fstatat(dirfd int, path string, stat *syscall.Stat_t, flags int) error {
 
 	return nil
 }
+
+func Readlinkat(dirfd int, path string, buf []byte) (int, error) {
+	p0, err := syscall.BytePtrFromString(path)
+	if err != nil {
+		return 0, err
+	}
+	var p1 unsafe.Pointer
+	if len(buf) > 0 {
+		p1 = unsafe.Pointer(&buf[0])
+	} else {
+		p1 = unsafe.Pointer(&_zero)
+	}
+	n, _, errno := syscall6(uintptr(unsafe.Pointer(&procReadlinkat)), 4,
+		uintptr(dirfd),
+		uintptr(unsafe.Pointer(p0)),
+		uintptr(p1),
+		uintptr(len(buf)),
+		0, 0)
+	if errno != 0 {
+		return 0, errno
+	}
+
+	return int(n), nil
+}
+
+func Mkdirat(dirfd int, path string, mode uint32) error {
+	p, err := syscall.BytePtrFromString(path)
+	if err != nil {
+		return err
+	}
+
+	_, _, errno := syscall6(uintptr(unsafe.Pointer(&procMkdirat)), 3,
+		uintptr(dirfd),
+		uintptr(unsafe.Pointer(p)),
+		uintptr(mode),
+		0, 0, 0)
+	if errno != 0 {
+		return errno
+	}
+	return nil
+}
diff --git a/src/internal/syscall/unix/at_openbsd.go b/src/internal/syscall/unix/at_openbsd.go
new file mode 100644
index 00000000..69463e00
--- /dev/null
+++ b/src/internal/syscall/unix/at_openbsd.go
@@ -0,0 +1,51 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build openbsd && !mips64
+
+package unix
+
+import (
+	"internal/abi"
+	"syscall"
+	"unsafe"
+)
+
+//go:cgo_import_dynamic libc_readlinkat readlinkat "libc.so"
+
+func libc_readlinkat_trampoline()
+
+func Readlinkat(dirfd int, path string, buf []byte) (int, error) {
+	p0, err := syscall.BytePtrFromString(path)
+	if err != nil {
+		return 0, err
+	}
+	var p1 unsafe.Pointer
+	if len(buf) > 0 {
+		p1 = unsafe.Pointer(&buf[0])
+	} else {
+		p1 = unsafe.Pointer(&_zero)
+	}
+	n, _, errno := syscall_syscall6(abi.FuncPCABI0(libc_readlinkat_trampoline), uintptr(dirfd), uintptr(unsafe.Pointer(p0)), uintptr(p1), uintptr(len(buf)), 0, 0)
+	if errno != 0 {
+		return 0, errno
+	}
+	return int(n), nil
+}
+
+//go:cgo_import_dynamic libc_mkdirat mkdirat "libc.so"
+
+func libc_mkdirat_trampoline()
+
+func Mkdirat(dirfd int, path string, mode uint32) error {
+	p, err := syscall.BytePtrFromString(path)
+	if err != nil {
+		return err
+	}
+	_, _, errno := syscall_syscall6(abi.FuncPCABI0(libc_mkdirat_trampoline), uintptr(dirfd), uintptr(unsafe.Pointer(p)), 0, 0, 0, 0)
+	if errno != 0 {
+		return errno
+	}
+	return nil
+}
diff --git a/src/internal/syscall/unix/at_solaris.go b/src/internal/syscall/unix/at_solaris.go
index ae1c1d64..fa65d9e8 100644
--- a/src/internal/syscall/unix/at_solaris.go
+++ b/src/internal/syscall/unix/at_solaris.go
@@ -12,12 +12,17 @@ func syscall6(trap, nargs, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err
 // Implemented as rawsysvicall6 in runtime/syscall_solaris.go.
 func rawSyscall6(trap, nargs, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err syscall.Errno)
 
+//go:cgo_import_dynamic libc_faccessat faccessat "libc.so"
 //go:cgo_import_dynamic libc_fstatat fstatat "libc.so"
 //go:cgo_import_dynamic libc_openat openat "libc.so"
 //go:cgo_import_dynamic libc_unlinkat unlinkat "libc.so"
+//go:cgo_import_dynamic libc_readlinkat readlinkat "libc.so"
+//go:cgo_import_dynamic libc_mkdirat mkdirat "libc.so"
 //go:cgo_import_dynamic libc_uname uname "libc.so"
 
 const (
+	AT_EACCESS          = 0x4
+	AT_FDCWD            = 0xffd19553
 	AT_REMOVEDIR        = 0x1
 	AT_SYMLINK_NOFOLLOW = 0x1000
 
diff --git a/src/internal/syscall/unix/at_sysnum_dragonfly.go b/src/internal/syscall/unix/at_sysnum_dragonfly.go
index a8164dcc..d0ba12a7 100644
--- a/src/internal/syscall/unix/at_sysnum_dragonfly.go
+++ b/src/internal/syscall/unix/at_sysnum_dragonfly.go
@@ -7,9 +7,11 @@ package unix
 import "syscall"
 
 const (
-	unlinkatTrap uintptr = syscall.SYS_UNLINKAT
-	openatTrap   uintptr = syscall.SYS_OPENAT
-	fstatatTrap  uintptr = syscall.SYS_FSTATAT
+	unlinkatTrap   uintptr = syscall.SYS_UNLINKAT
+	openatTrap     uintptr = syscall.SYS_OPENAT
+	fstatatTrap    uintptr = syscall.SYS_FSTATAT
+	readlinkatTrap uintptr = syscall.SYS_READLINKAT
+	mkdiratTrap    uintptr = syscall.SYS_MKDIRAT
 
 	AT_EACCESS          = 0x4
 	AT_FDCWD            = 0xfffafdcd
diff --git a/src/internal/syscall/unix/at_sysnum_freebsd.go b/src/internal/syscall/unix/at_sysnum_freebsd.go
index f74961d5..0f347224 100644
--- a/src/internal/syscall/unix/at_sysnum_freebsd.go
+++ b/src/internal/syscall/unix/at_sysnum_freebsd.go
@@ -17,4 +17,6 @@ const (
 	unlinkatTrap       uintptr = syscall.SYS_UNLINKAT
 	openatTrap         uintptr = syscall.SYS_OPENAT
 	posixFallocateTrap uintptr = syscall.SYS_POSIX_FALLOCATE
+	readlinkatTrap     uintptr = syscall.SYS_READLINKAT
+	mkdiratTrap        uintptr = syscall.SYS_MKDIRAT
 )
diff --git a/src/internal/syscall/unix/at_sysnum_linux.go b/src/internal/syscall/unix/at_sysnum_linux.go
index 7c3b15c3..2885c7c6 100644
--- a/src/internal/syscall/unix/at_sysnum_linux.go
+++ b/src/internal/syscall/unix/at_sysnum_linux.go
@@ -6,8 +6,12 @@ package unix
 
 import "syscall"
 
-const unlinkatTrap uintptr = syscall.SYS_UNLINKAT
-const openatTrap uintptr = syscall.SYS_OPENAT
+const (
+	unlinkatTrap   uintptr = syscall.SYS_UNLINKAT
+	openatTrap     uintptr = syscall.SYS_OPENAT
+	readlinkatTrap uintptr = syscall.SYS_READLINKAT
+	mkdiratTrap    uintptr = syscall.SYS_MKDIRAT
+)
 
 const (
 	AT_EACCESS          = 0x200
diff --git a/src/internal/syscall/unix/at_sysnum_netbsd.go b/src/internal/syscall/unix/at_sysnum_netbsd.go
index ffb1d2ea..820b9774 100644
--- a/src/internal/syscall/unix/at_sysnum_netbsd.go
+++ b/src/internal/syscall/unix/at_sysnum_netbsd.go
@@ -6,9 +6,13 @@ package unix
 
 import "syscall"
 
-const unlinkatTrap uintptr = syscall.SYS_UNLINKAT
-const openatTrap uintptr = syscall.SYS_OPENAT
-const fstatatTrap uintptr = syscall.SYS_FSTATAT
+const (
+	unlinkatTrap   uintptr = syscall.SYS_UNLINKAT
+	openatTrap     uintptr = syscall.SYS_OPENAT
+	fstatatTrap    uintptr = syscall.SYS_FSTATAT
+	readlinkatTrap uintptr = syscall.SYS_READLINKAT
+	mkdiratTrap    uintptr = syscall.SYS_MKDIRAT
+)
 
 const (
 	AT_EACCESS          = 0x100
diff --git a/src/internal/syscall/unix/at_sysnum_openbsd.go b/src/internal/syscall/unix/at_sysnum_openbsd.go
index 3b0c0dbd..7672414c 100644
--- a/src/internal/syscall/unix/at_sysnum_openbsd.go
+++ b/src/internal/syscall/unix/at_sysnum_openbsd.go
@@ -6,9 +6,13 @@ package unix
 
 import "syscall"
 
-const unlinkatTrap uintptr = syscall.SYS_UNLINKAT
-const openatTrap uintptr = syscall.SYS_OPENAT
-const fstatatTrap uintptr = syscall.SYS_FSTATAT
+const (
+	unlinkatTrap   uintptr = syscall.SYS_UNLINKAT
+	openatTrap     uintptr = syscall.SYS_OPENAT
+	fstatatTrap    uintptr = syscall.SYS_FSTATAT
+	readlinkatTrap uintptr = syscall.SYS_READLINKAT
+	mkdiratTrap    uintptr = syscall.SYS_MKDIRAT
+)
 
 const (
 	AT_EACCESS          = 0x1
diff --git a/src/internal/syscall/unix/at_wasip1.go b/src/internal/syscall/unix/at_wasip1.go
index 3d47d7eb..cd0cb4b7 100644
--- a/src/internal/syscall/unix/at_wasip1.go
+++ b/src/internal/syscall/unix/at_wasip1.go
@@ -2,12 +2,112 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build wasip1
+
 package unix
 
+import (
+	"syscall"
+	"unsafe"
+)
+
+// The values of these constants are not part of the WASI API.
 const (
 	// UTIME_OMIT is the sentinel value to indicate that a time value should not
 	// be changed. It is useful for example to indicate for example with UtimesNano
 	// to avoid changing AccessTime or ModifiedTime.
 	// Its value must match syscall/fs_wasip1.go
 	UTIME_OMIT = -0x2
+
+	AT_REMOVEDIR        = 0x200
+	AT_SYMLINK_NOFOLLOW = 0x100
 )
+
+func Unlinkat(dirfd int, path string, flags int) error {
+	if flags&AT_REMOVEDIR == 0 {
+		return errnoErr(path_unlink_file(
+			int32(dirfd),
+			unsafe.StringData(path),
+			size(len(path)),
+		))
+	} else {
+		return errnoErr(path_remove_directory(
+			int32(dirfd),
+			unsafe.StringData(path),
+			size(len(path)),
+		))
+	}
+}
+
+//go:wasmimport wasi_snapshot_preview1 path_unlink_file
+//go:noescape
+func path_unlink_file(fd int32, path *byte, pathLen size) syscall.Errno
+
+//go:wasmimport wasi_snapshot_preview1 path_remove_directory
+//go:noescape
+func path_remove_directory(fd int32, path *byte, pathLen size) syscall.Errno
+
+func Openat(dirfd int, path string, flags int, perm uint32) (int, error) {
+	return syscall.Openat(dirfd, path, flags, perm)
+}
+
+func Fstatat(dirfd int, path string, stat *syscall.Stat_t, flags int) error {
+	var filestatFlags uint32
+	if flags&AT_SYMLINK_NOFOLLOW == 0 {
+		filestatFlags |= syscall.LOOKUP_SYMLINK_FOLLOW
+	}
+	return errnoErr(path_filestat_get(
+		int32(dirfd),
+		uint32(filestatFlags),
+		unsafe.StringData(path),
+		size(len(path)),
+		unsafe.Pointer(stat),
+	))
+}
+
+//go:wasmimport wasi_snapshot_preview1 path_filestat_get
+//go:noescape
+func path_filestat_get(fd int32, flags uint32, path *byte, pathLen size, buf unsafe.Pointer) syscall.Errno
+
+func Readlinkat(dirfd int, path string, buf []byte) (int, error) {
+	var nwritten size
+	errno := path_readlink(
+		int32(dirfd),
+		unsafe.StringData(path),
+		size(len(path)),
+		&buf[0],
+		size(len(buf)),
+		&nwritten)
+	return int(nwritten), errnoErr(errno)
+
+}
+
+type (
+	size = uint32
+)
+
+//go:wasmimport wasi_snapshot_preview1 path_readlink
+//go:noescape
+func path_readlink(fd int32, path *byte, pathLen size, buf *byte, bufLen size, nwritten *size) syscall.Errno
+
+func Mkdirat(dirfd int, path string, mode uint32) error {
+	if path == "" {
+		return syscall.EINVAL
+	}
+	return errnoErr(path_create_directory(
+		int32(dirfd),
+		unsafe.StringData(path),
+		size(len(path)),
+	))
+}
+
+//go:wasmimport wasi_snapshot_preview1 path_create_directory
+//go:noescape
+func path_create_directory(fd int32, path *byte, pathLen size) syscall.Errno
+
+func errnoErr(errno syscall.Errno) error {
+	if errno == 0 {
+		return nil
+	}
+	return errno
+}
diff --git a/src/internal/syscall/unix/copy_file_range_linux.go b/src/internal/syscall/unix/copy_file_range_unix.go
similarity index 95%
rename from src/internal/syscall/unix/copy_file_range_linux.go
rename to src/internal/syscall/unix/copy_file_range_unix.go
index cf0a279a..16a43421 100644
--- a/src/internal/syscall/unix/copy_file_range_linux.go
+++ b/src/internal/syscall/unix/copy_file_range_unix.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build freebsd || linux
+
 package unix
 
 import (
diff --git a/src/internal/syscall/unix/eaccess.go b/src/internal/syscall/unix/eaccess.go
new file mode 100644
index 00000000..3c12314a
--- /dev/null
+++ b/src/internal/syscall/unix/eaccess.go
@@ -0,0 +1,24 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build unix
+
+package unix
+
+import (
+	"runtime"
+	"syscall"
+)
+
+func Eaccess(path string, mode uint32) error {
+	if runtime.GOOS == "android" {
+		// syscall.Faccessat for Android implements AT_EACCESS check in
+		// userspace. Since Android doesn't have setuid programs and
+		// never runs code with euid!=uid, AT_EACCESS check is not
+		// really required. Return ENOSYS so the callers can fall back
+		// to permission bits check.
+		return syscall.ENOSYS
+	}
+	return faccessat(AT_FDCWD, path, mode, AT_EACCESS)
+}
diff --git a/src/internal/syscall/unix/eaccess_linux.go b/src/internal/syscall/unix/eaccess_linux.go
deleted file mode 100644
index 5695a5e4..00000000
--- a/src/internal/syscall/unix/eaccess_linux.go
+++ /dev/null
@@ -1,11 +0,0 @@
-// Copyright 2022 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package unix
-
-import "syscall"
-
-func Eaccess(path string, mode uint32) error {
-	return syscall.Faccessat(AT_FDCWD, path, mode, AT_EACCESS)
-}
diff --git a/src/internal/syscall/unix/eaccess_other.go b/src/internal/syscall/unix/eaccess_other.go
deleted file mode 100644
index 3da3a64f..00000000
--- a/src/internal/syscall/unix/eaccess_other.go
+++ /dev/null
@@ -1,13 +0,0 @@
-// Copyright 2022 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-//go:build unix && !darwin && !dragonfly && !freebsd && !linux && !openbsd && !netbsd
-
-package unix
-
-import "syscall"
-
-func Eaccess(path string, mode uint32) error {
-	return syscall.ENOSYS
-}
diff --git a/src/internal/syscall/unix/eaccess_bsd.go b/src/internal/syscall/unix/faccessat_bsd.go
similarity index 85%
rename from src/internal/syscall/unix/eaccess_bsd.go
rename to src/internal/syscall/unix/faccessat_bsd.go
index 7077af17..78fca18e 100644
--- a/src/internal/syscall/unix/eaccess_bsd.go
+++ b/src/internal/syscall/unix/faccessat_bsd.go
@@ -22,7 +22,3 @@ func faccessat(dirfd int, path string, mode uint32, flags int) error {
 	}
 	return err
 }
-
-func Eaccess(path string, mode uint32) error {
-	return faccessat(AT_FDCWD, path, mode, AT_EACCESS)
-}
diff --git a/src/internal/syscall/unix/eaccess_darwin.go b/src/internal/syscall/unix/faccessat_darwin.go
similarity index 87%
rename from src/internal/syscall/unix/eaccess_darwin.go
rename to src/internal/syscall/unix/faccessat_darwin.go
index 0fa8d17a..ef790aa9 100644
--- a/src/internal/syscall/unix/eaccess_darwin.go
+++ b/src/internal/syscall/unix/faccessat_darwin.go
@@ -25,7 +25,3 @@ func faccessat(dirfd int, path string, mode uint32, flags int) error {
 	}
 	return nil
 }
-
-func Eaccess(path string, mode uint32) error {
-	return faccessat(AT_FDCWD, path, mode, AT_EACCESS)
-}
diff --git a/src/internal/syscall/unix/eaccess_openbsd.go b/src/internal/syscall/unix/faccessat_openbsd.go
similarity index 89%
rename from src/internal/syscall/unix/eaccess_openbsd.go
rename to src/internal/syscall/unix/faccessat_openbsd.go
index 5e91f11f..9d4ed972 100644
--- a/src/internal/syscall/unix/eaccess_openbsd.go
+++ b/src/internal/syscall/unix/faccessat_openbsd.go
@@ -30,7 +30,3 @@ func faccessat(dirfd int, path string, mode uint32, flags int) error {
 	}
 	return err
 }
-
-func Eaccess(path string, mode uint32) error {
-	return faccessat(AT_FDCWD, path, mode, AT_EACCESS)
-}
diff --git a/src/internal/syscall/unix/faccessat_solaris.go b/src/internal/syscall/unix/faccessat_solaris.go
new file mode 100644
index 00000000..47e05fb2
--- /dev/null
+++ b/src/internal/syscall/unix/faccessat_solaris.go
@@ -0,0 +1,28 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package unix
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+//go:linkname procFaccessat libc_faccessat
+
+var procFaccessat uintptr
+
+func faccessat(dirfd int, path string, mode uint32, flags int) error {
+	p, err := syscall.BytePtrFromString(path)
+	if err != nil {
+		return err
+	}
+
+	_, _, errno := syscall6(uintptr(unsafe.Pointer(&procFaccessat)), 4, uintptr(dirfd), uintptr(unsafe.Pointer(p)), uintptr(mode), uintptr(flags), 0, 0)
+	if errno != 0 {
+		return errno
+	}
+
+	return nil
+}
diff --git a/src/internal/syscall/unix/faccessat_syscall.go b/src/internal/syscall/unix/faccessat_syscall.go
new file mode 100644
index 00000000..865e40b2
--- /dev/null
+++ b/src/internal/syscall/unix/faccessat_syscall.go
@@ -0,0 +1,11 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build aix || linux
+
+package unix
+
+import "syscall"
+
+var faccessat = syscall.Faccessat
diff --git a/src/internal/syscall/unix/getentropy_openbsd.go b/src/internal/syscall/unix/getentropy_openbsd.go
deleted file mode 100644
index ad0914da..00000000
--- a/src/internal/syscall/unix/getentropy_openbsd.go
+++ /dev/null
@@ -1,17 +0,0 @@
-// Copyright 2022 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-//go:build openbsd && !mips64
-
-package unix
-
-import _ "unsafe" // for linkname
-
-// GetEntropy calls the OpenBSD getentropy system call.
-func GetEntropy(p []byte) error {
-	return getentropy(p)
-}
-
-//go:linkname getentropy syscall.getentropy
-func getentropy(p []byte) error
diff --git a/src/internal/syscall/unix/getentropy_openbsd_mips64.go b/src/internal/syscall/unix/getentropy_openbsd_mips64.go
deleted file mode 100644
index d5caa809..00000000
--- a/src/internal/syscall/unix/getentropy_openbsd_mips64.go
+++ /dev/null
@@ -1,25 +0,0 @@
-// Copyright 2016 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package unix
-
-import (
-	"syscall"
-	"unsafe"
-)
-
-// getentropy(2)'s syscall number, from /usr/src/sys/kern/syscalls.master
-const entropyTrap uintptr = 7
-
-// GetEntropy calls the OpenBSD getentropy system call.
-func GetEntropy(p []byte) error {
-	_, _, errno := syscall.Syscall(entropyTrap,
-		uintptr(unsafe.Pointer(&p[0])),
-		uintptr(len(p)),
-		0)
-	if errno != 0 {
-		return errno
-	}
-	return nil
-}
diff --git a/src/internal/syscall/unix/getrandom.go b/src/internal/syscall/unix/getrandom.go
index e83f0cd6..db3e7ac0 100644
--- a/src/internal/syscall/unix/getrandom.go
+++ b/src/internal/syscall/unix/getrandom.go
@@ -12,6 +12,10 @@ import (
 	"unsafe"
 )
 
+//go:linkname vgetrandom runtime.vgetrandom
+//go:noescape
+func vgetrandom(p []byte, flags uint32) (ret int, supported bool)
+
 var getrandomUnsupported atomic.Bool
 
 // GetRandomFlag is a flag supported by the getrandom system call.
@@ -19,14 +23,18 @@ type GetRandomFlag uintptr
 
 // GetRandom calls the getrandom system call.
 func GetRandom(p []byte, flags GetRandomFlag) (n int, err error) {
-	if len(p) == 0 {
-		return 0, nil
+	ret, supported := vgetrandom(p, uint32(flags))
+	if supported {
+		if ret < 0 {
+			return 0, syscall.Errno(-ret)
+		}
+		return ret, nil
 	}
 	if getrandomUnsupported.Load() {
 		return 0, syscall.ENOSYS
 	}
 	r1, _, errno := syscall.Syscall(getrandomTrap,
-		uintptr(unsafe.Pointer(&p[0])),
+		uintptr(unsafe.Pointer(unsafe.SliceData(p))),
 		uintptr(len(p)),
 		uintptr(flags))
 	if errno != 0 {
diff --git a/src/internal/syscall/unix/getrandom_linux_test.go b/src/internal/syscall/unix/getrandom_linux_test.go
new file mode 100644
index 00000000..e1778c19
--- /dev/null
+++ b/src/internal/syscall/unix/getrandom_linux_test.go
@@ -0,0 +1,22 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package unix_test
+
+import (
+	"internal/syscall/unix"
+	"testing"
+)
+
+func BenchmarkParallelGetRandom(b *testing.B) {
+	b.SetBytes(4)
+	b.RunParallel(func(pb *testing.PB) {
+		var buf [4]byte
+		for pb.Next() {
+			if _, err := unix.GetRandom(buf[:], 0); err != nil {
+				b.Fatal(err)
+			}
+		}
+	})
+}
diff --git a/src/internal/syscall/unix/kernel_version_freebsd.go b/src/internal/syscall/unix/kernel_version_freebsd.go
new file mode 100644
index 00000000..ef9ee136
--- /dev/null
+++ b/src/internal/syscall/unix/kernel_version_freebsd.go
@@ -0,0 +1,48 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package unix
+
+import (
+	"sync"
+	"syscall"
+)
+
+// KernelVersion returns major and minor kernel version numbers
+// parsed from the syscall.Sysctl("kern.osrelease")'s value,
+// or (0, 0) if the version can't be obtained or parsed.
+func KernelVersion() (major, minor int) {
+	release, err := syscall.Sysctl("kern.osrelease")
+	if err != nil {
+		return 0, 0
+	}
+
+	parseNext := func() (n int) {
+		for i, c := range release {
+			if c == '.' {
+				release = release[i+1:]
+				return
+			}
+			if '0' <= c && c <= '9' {
+				n = n*10 + int(c-'0')
+			}
+		}
+		release = ""
+		return
+	}
+
+	major = parseNext()
+	minor = parseNext()
+
+	return
+}
+
+// SupportCopyFileRange reports whether the kernel supports the copy_file_range(2).
+// This function will examine both the kernel version and the availability of the system call.
+var SupportCopyFileRange = sync.OnceValue(func() bool {
+	// The copy_file_range() function first appeared in FreeBSD 13.0.
+	major, _ := KernelVersion()
+	_, err := CopyFileRange(0, nil, 0, nil, 0, 0)
+	return major >= 13 && err != syscall.ENOSYS
+})
diff --git a/src/internal/syscall/unix/kernel_version_freebsd_test.go b/src/internal/syscall/unix/kernel_version_freebsd_test.go
new file mode 100644
index 00000000..694440e3
--- /dev/null
+++ b/src/internal/syscall/unix/kernel_version_freebsd_test.go
@@ -0,0 +1,23 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package unix_test
+
+import (
+	"internal/syscall/unix"
+	"syscall"
+	"testing"
+)
+
+func TestSupportCopyFileRange(t *testing.T) {
+	major, minor := unix.KernelVersion()
+	t.Logf("Running on FreeBSD %d.%d\n", major, minor)
+
+	_, err := unix.CopyFileRange(0, nil, 0, nil, 0, 0)
+	want := err != syscall.ENOSYS
+	got := unix.SupportCopyFileRange()
+	if want != got {
+		t.Fatalf("SupportCopyFileRange, got %t; want %t", got, want)
+	}
+}
diff --git a/src/internal/syscall/unix/kernel_version_linux.go b/src/internal/syscall/unix/kernel_version_linux.go
index 71e8aa4c..f3656288 100644
--- a/src/internal/syscall/unix/kernel_version_linux.go
+++ b/src/internal/syscall/unix/kernel_version_linux.go
@@ -8,11 +8,9 @@ import (
 	"syscall"
 )
 
-// KernelVersion returns major and minor kernel version numbers, parsed from
-// the syscall.Uname's Release field, or 0, 0 if the version can't be obtained
-// or parsed.
-//
-// Currently only implemented for Linux.
+// KernelVersion returns major and minor kernel version numbers
+// parsed from the syscall.Uname's Release field, or (0, 0) if
+// the version can't be obtained or parsed.
 func KernelVersion() (major, minor int) {
 	var uname syscall.Utsname
 	if err := syscall.Uname(&uname); err != nil {
diff --git a/src/internal/syscall/unix/kernel_version_other.go b/src/internal/syscall/unix/kernel_version_other.go
index fc65c1c8..91c14b31 100644
--- a/src/internal/syscall/unix/kernel_version_other.go
+++ b/src/internal/syscall/unix/kernel_version_other.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build !linux && !solaris
+//go:build !freebsd && !linux && !solaris
 
 package unix
 
diff --git a/src/internal/syscall/unix/net_darwin.go b/src/internal/syscall/unix/net_darwin.go
index bbaa94b0..7e8f2ac1 100644
--- a/src/internal/syscall/unix/net_darwin.go
+++ b/src/internal/syscall/unix/net_darwin.go
@@ -16,12 +16,13 @@ const (
 	AI_V4MAPPED  = 0x800
 	AI_MASK      = 0x1407
 
-	EAI_AGAIN    = 2
-	EAI_NODATA   = 7
-	EAI_NONAME   = 8
-	EAI_SERVICE  = 9
-	EAI_SYSTEM   = 11
-	EAI_OVERFLOW = 14
+	EAI_ADDRFAMILY = 1
+	EAI_AGAIN      = 2
+	EAI_NODATA     = 7
+	EAI_NONAME     = 8
+	EAI_SERVICE    = 9
+	EAI_SYSTEM     = 11
+	EAI_OVERFLOW   = 14
 
 	NI_NAMEREQD = 4
 )
diff --git a/src/internal/syscall/unix/syscall.go b/src/internal/syscall/unix/syscall.go
new file mode 100644
index 00000000..99805d98
--- /dev/null
+++ b/src/internal/syscall/unix/syscall.go
@@ -0,0 +1,8 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package unix
+
+// Single-word zero for use when we need a valid pointer to 0 bytes.
+var _zero uintptr
diff --git a/src/cmd/compile/internal/importer/testdata/alias.go b/src/internal/syscall/unix/sysnum_freebsd.go
similarity index 75%
rename from src/cmd/compile/internal/importer/testdata/alias.go
rename to src/internal/syscall/unix/sysnum_freebsd.go
index 51492fc9..2c811104 100644
--- a/src/cmd/compile/internal/importer/testdata/alias.go
+++ b/src/internal/syscall/unix/sysnum_freebsd.go
@@ -2,6 +2,6 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-package testdata
+package unix
 
-type A = int32
+const copyFileRangeTrap uintptr = 569
diff --git a/src/internal/syscall/unix/sysnum_linux_386.go b/src/internal/syscall/unix/sysnum_linux_386.go
index be048bcf..c83beef7 100644
--- a/src/internal/syscall/unix/sysnum_linux_386.go
+++ b/src/internal/syscall/unix/sysnum_linux_386.go
@@ -9,4 +9,5 @@ const (
 	copyFileRangeTrap   uintptr = 377
 	pidfdSendSignalTrap uintptr = 424
 	pidfdOpenTrap       uintptr = 434
+	openat2Trap         uintptr = 437
 )
diff --git a/src/internal/syscall/unix/sysnum_linux_amd64.go b/src/internal/syscall/unix/sysnum_linux_amd64.go
index 525de9cb..098e3320 100644
--- a/src/internal/syscall/unix/sysnum_linux_amd64.go
+++ b/src/internal/syscall/unix/sysnum_linux_amd64.go
@@ -9,4 +9,5 @@ const (
 	copyFileRangeTrap   uintptr = 326
 	pidfdSendSignalTrap uintptr = 424
 	pidfdOpenTrap       uintptr = 434
+	openat2Trap         uintptr = 437
 )
diff --git a/src/internal/syscall/unix/sysnum_linux_arm.go b/src/internal/syscall/unix/sysnum_linux_arm.go
index b8038922..f0cd45f9 100644
--- a/src/internal/syscall/unix/sysnum_linux_arm.go
+++ b/src/internal/syscall/unix/sysnum_linux_arm.go
@@ -9,4 +9,5 @@ const (
 	copyFileRangeTrap   uintptr = 391
 	pidfdSendSignalTrap uintptr = 424
 	pidfdOpenTrap       uintptr = 434
+	openat2Trap         uintptr = 437
 )
diff --git a/src/internal/syscall/unix/sysnum_linux_generic.go b/src/internal/syscall/unix/sysnum_linux_generic.go
index b06bf692..ec622cff 100644
--- a/src/internal/syscall/unix/sysnum_linux_generic.go
+++ b/src/internal/syscall/unix/sysnum_linux_generic.go
@@ -15,4 +15,5 @@ const (
 	copyFileRangeTrap   uintptr = 285
 	pidfdSendSignalTrap uintptr = 424
 	pidfdOpenTrap       uintptr = 434
+	openat2Trap         uintptr = 437
 )
diff --git a/src/internal/syscall/unix/sysnum_linux_mips64x.go b/src/internal/syscall/unix/sysnum_linux_mips64x.go
index 8764f5dc..3875105d 100644
--- a/src/internal/syscall/unix/sysnum_linux_mips64x.go
+++ b/src/internal/syscall/unix/sysnum_linux_mips64x.go
@@ -11,4 +11,5 @@ const (
 	copyFileRangeTrap   uintptr = 5320
 	pidfdSendSignalTrap uintptr = 5424
 	pidfdOpenTrap       uintptr = 5434
+	openat2Trap         uintptr = 5437
 )
diff --git a/src/internal/syscall/unix/sysnum_linux_mipsx.go b/src/internal/syscall/unix/sysnum_linux_mipsx.go
index 9b2e587b..bdd2fef2 100644
--- a/src/internal/syscall/unix/sysnum_linux_mipsx.go
+++ b/src/internal/syscall/unix/sysnum_linux_mipsx.go
@@ -11,4 +11,5 @@ const (
 	copyFileRangeTrap   uintptr = 4360
 	pidfdSendSignalTrap uintptr = 4424
 	pidfdOpenTrap       uintptr = 4434
+	openat2Trap         uintptr = 4437
 )
diff --git a/src/internal/syscall/unix/sysnum_linux_ppc64x.go b/src/internal/syscall/unix/sysnum_linux_ppc64x.go
index 03e9c197..9291d58f 100644
--- a/src/internal/syscall/unix/sysnum_linux_ppc64x.go
+++ b/src/internal/syscall/unix/sysnum_linux_ppc64x.go
@@ -11,4 +11,5 @@ const (
 	copyFileRangeTrap   uintptr = 379
 	pidfdSendSignalTrap uintptr = 424
 	pidfdOpenTrap       uintptr = 434
+	openat2Trap         uintptr = 437
 )
diff --git a/src/internal/syscall/unix/sysnum_linux_s390x.go b/src/internal/syscall/unix/sysnum_linux_s390x.go
index c6e3e02e..65a82d1c 100644
--- a/src/internal/syscall/unix/sysnum_linux_s390x.go
+++ b/src/internal/syscall/unix/sysnum_linux_s390x.go
@@ -9,4 +9,5 @@ const (
 	copyFileRangeTrap   uintptr = 375
 	pidfdSendSignalTrap uintptr = 424
 	pidfdOpenTrap       uintptr = 434
+	openat2Trap         uintptr = 437
 )
diff --git a/src/internal/syscall/unix/waitid_linux.go b/src/internal/syscall/unix/waitid_linux.go
new file mode 100644
index 00000000..240a7f74
--- /dev/null
+++ b/src/internal/syscall/unix/waitid_linux.go
@@ -0,0 +1,23 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package unix
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+const (
+	P_PID   = 1
+	P_PIDFD = 3
+)
+
+func Waitid(idType int, id int, info *SiginfoChild, options int, rusage *syscall.Rusage) error {
+	_, _, errno := syscall.Syscall6(syscall.SYS_WAITID, uintptr(idType), uintptr(id), uintptr(unsafe.Pointer(info)), uintptr(options), uintptr(unsafe.Pointer(rusage)), 0)
+	if errno != 0 {
+		return errno
+	}
+	return nil
+}
diff --git a/src/internal/syscall/windows/at_windows.go b/src/internal/syscall/windows/at_windows.go
new file mode 100644
index 00000000..18429773
--- /dev/null
+++ b/src/internal/syscall/windows/at_windows.go
@@ -0,0 +1,252 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package windows
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+// Openat flags not supported by syscall.Open.
+//
+// These are invented values.
+//
+// When adding a new flag here, add an unexported version to
+// the set of invented O_ values in syscall/types_windows.go
+// to avoid overlap.
+const (
+	O_DIRECTORY    = 0x100000   // target must be a directory
+	O_NOFOLLOW_ANY = 0x20000000 // disallow symlinks anywhere in the path
+	O_OPEN_REPARSE = 0x40000000 // FILE_OPEN_REPARSE_POINT, used by Lstat
+)
+
+func Openat(dirfd syscall.Handle, name string, flag int, perm uint32) (_ syscall.Handle, e1 error) {
+	if len(name) == 0 {
+		return syscall.InvalidHandle, syscall.ERROR_FILE_NOT_FOUND
+	}
+
+	var access, options uint32
+	switch flag & (syscall.O_RDONLY | syscall.O_WRONLY | syscall.O_RDWR) {
+	case syscall.O_RDONLY:
+		// FILE_GENERIC_READ includes FILE_LIST_DIRECTORY.
+		access = FILE_GENERIC_READ
+	case syscall.O_WRONLY:
+		access = FILE_GENERIC_WRITE
+		options |= FILE_NON_DIRECTORY_FILE
+	case syscall.O_RDWR:
+		access = FILE_GENERIC_READ | FILE_GENERIC_WRITE
+		options |= FILE_NON_DIRECTORY_FILE
+	default:
+		// Stat opens files without requesting read or write permissions,
+		// but we still need to request SYNCHRONIZE.
+		access = SYNCHRONIZE
+	}
+	if flag&syscall.O_CREAT != 0 {
+		access |= FILE_GENERIC_WRITE
+	}
+	if flag&syscall.O_APPEND != 0 {
+		access |= FILE_APPEND_DATA
+		// Remove FILE_WRITE_DATA access unless O_TRUNC is set,
+		// in which case we need it to truncate the file.
+		if flag&syscall.O_TRUNC == 0 {
+			access &^= FILE_WRITE_DATA
+		}
+	}
+	if flag&O_DIRECTORY != 0 {
+		options |= FILE_DIRECTORY_FILE
+		access |= FILE_LIST_DIRECTORY
+	}
+	if flag&syscall.O_SYNC != 0 {
+		options |= FILE_WRITE_THROUGH
+	}
+	// Allow File.Stat.
+	access |= STANDARD_RIGHTS_READ | FILE_READ_ATTRIBUTES | FILE_READ_EA
+
+	objAttrs := &OBJECT_ATTRIBUTES{}
+	if flag&O_NOFOLLOW_ANY != 0 {
+		objAttrs.Attributes |= OBJ_DONT_REPARSE
+	}
+	if flag&syscall.O_CLOEXEC == 0 {
+		objAttrs.Attributes |= OBJ_INHERIT
+	}
+	if err := objAttrs.init(dirfd, name); err != nil {
+		return syscall.InvalidHandle, err
+	}
+
+	if flag&O_OPEN_REPARSE != 0 {
+		options |= FILE_OPEN_REPARSE_POINT
+	}
+
+	// We don't use FILE_OVERWRITE/FILE_OVERWRITE_IF, because when opening
+	// a file with FILE_ATTRIBUTE_READONLY these will replace an existing
+	// file with a new, read-only one.
+	//
+	// Instead, we ftruncate the file after opening when O_TRUNC is set.
+	var disposition uint32
+	switch {
+	case flag&(syscall.O_CREAT|syscall.O_EXCL) == (syscall.O_CREAT | syscall.O_EXCL):
+		disposition = FILE_CREATE
+	case flag&syscall.O_CREAT == syscall.O_CREAT:
+		disposition = FILE_OPEN_IF
+	default:
+		disposition = FILE_OPEN
+	}
+
+	fileAttrs := uint32(FILE_ATTRIBUTE_NORMAL)
+	if perm&syscall.S_IWRITE == 0 {
+		fileAttrs = FILE_ATTRIBUTE_READONLY
+	}
+
+	var h syscall.Handle
+	err := NtCreateFile(
+		&h,
+		SYNCHRONIZE|access,
+		objAttrs,
+		&IO_STATUS_BLOCK{},
+		nil,
+		fileAttrs,
+		FILE_SHARE_READ|FILE_SHARE_WRITE|FILE_SHARE_DELETE,
+		disposition,
+		FILE_SYNCHRONOUS_IO_NONALERT|FILE_OPEN_FOR_BACKUP_INTENT|options,
+		0,
+		0,
+	)
+	if err != nil {
+		return h, ntCreateFileError(err, flag)
+	}
+
+	if flag&syscall.O_TRUNC != 0 {
+		err = syscall.Ftruncate(h, 0)
+		if err != nil {
+			syscall.CloseHandle(h)
+			return syscall.InvalidHandle, err
+		}
+	}
+
+	return h, nil
+}
+
+// ntCreateFileError maps error returns from NTCreateFile to user-visible errors.
+func ntCreateFileError(err error, flag int) error {
+	s, ok := err.(NTStatus)
+	if !ok {
+		// Shouldn't really be possible, NtCreateFile always returns NTStatus.
+		return err
+	}
+	switch s {
+	case STATUS_REPARSE_POINT_ENCOUNTERED:
+		return syscall.ELOOP
+	case STATUS_NOT_A_DIRECTORY:
+		// ENOTDIR is the errno returned by open when O_DIRECTORY is specified
+		// and the target is not a directory.
+		//
+		// NtCreateFile can return STATUS_NOT_A_DIRECTORY under other circumstances,
+		// such as when opening "file/" where "file" is not a directory.
+		// (This might be Windows version dependent.)
+		//
+		// Only map STATUS_NOT_A_DIRECTORY to ENOTDIR when O_DIRECTORY is specified.
+		if flag&O_DIRECTORY != 0 {
+			return syscall.ENOTDIR
+		}
+	case STATUS_FILE_IS_A_DIRECTORY:
+		return syscall.EISDIR
+	}
+	return s.Errno()
+}
+
+func Mkdirat(dirfd syscall.Handle, name string, mode uint32) error {
+	objAttrs := &OBJECT_ATTRIBUTES{}
+	if err := objAttrs.init(dirfd, name); err != nil {
+		return err
+	}
+	var h syscall.Handle
+	err := NtCreateFile(
+		&h,
+		FILE_GENERIC_READ,
+		objAttrs,
+		&IO_STATUS_BLOCK{},
+		nil,
+		syscall.FILE_ATTRIBUTE_NORMAL,
+		syscall.FILE_SHARE_READ|syscall.FILE_SHARE_WRITE|syscall.FILE_SHARE_DELETE,
+		FILE_CREATE,
+		FILE_DIRECTORY_FILE,
+		0,
+		0,
+	)
+	if err != nil {
+		return ntCreateFileError(err, 0)
+	}
+	syscall.CloseHandle(h)
+	return nil
+}
+
+func Deleteat(dirfd syscall.Handle, name string) error {
+	objAttrs := &OBJECT_ATTRIBUTES{}
+	if err := objAttrs.init(dirfd, name); err != nil {
+		return err
+	}
+	var h syscall.Handle
+	err := NtOpenFile(
+		&h,
+		DELETE,
+		objAttrs,
+		&IO_STATUS_BLOCK{},
+		FILE_SHARE_DELETE|FILE_SHARE_READ|FILE_SHARE_WRITE,
+		FILE_OPEN_REPARSE_POINT|FILE_OPEN_FOR_BACKUP_INTENT,
+	)
+	if err != nil {
+		return ntCreateFileError(err, 0)
+	}
+	defer syscall.CloseHandle(h)
+
+	const (
+		FileDispositionInformation   = 13
+		FileDispositionInformationEx = 64
+	)
+
+	// First, attempt to delete the file using POSIX semantics
+	// (which permit a file to be deleted while it is still open).
+	// This matches the behavior of DeleteFileW.
+	err = NtSetInformationFile(
+		h,
+		&IO_STATUS_BLOCK{},
+		uintptr(unsafe.Pointer(&FILE_DISPOSITION_INFORMATION_EX{
+			Flags: FILE_DISPOSITION_DELETE |
+				FILE_DISPOSITION_FORCE_IMAGE_SECTION_CHECK |
+				FILE_DISPOSITION_POSIX_SEMANTICS |
+				// This differs from DeleteFileW, but matches os.Remove's
+				// behavior on Unix platforms of permitting deletion of
+				// read-only files.
+				FILE_DISPOSITION_IGNORE_READONLY_ATTRIBUTE,
+		})),
+		uint32(unsafe.Sizeof(FILE_DISPOSITION_INFORMATION_EX{})),
+		FileDispositionInformationEx,
+	)
+	switch err {
+	case nil:
+		return nil
+	case STATUS_CANNOT_DELETE, STATUS_DIRECTORY_NOT_EMPTY:
+		return err.(NTStatus).Errno()
+	}
+
+	// If the prior deletion failed, the filesystem either doesn't support
+	// POSIX semantics (for example, FAT), or hasn't implemented
+	// FILE_DISPOSITION_INFORMATION_EX.
+	//
+	// Try again.
+	err = NtSetInformationFile(
+		h,
+		&IO_STATUS_BLOCK{},
+		uintptr(unsafe.Pointer(&FILE_DISPOSITION_INFORMATION{
+			DeleteFile: true,
+		})),
+		uint32(unsafe.Sizeof(FILE_DISPOSITION_INFORMATION{})),
+		FileDispositionInformation,
+	)
+	if st, ok := err.(NTStatus); ok {
+		return st.Errno()
+	}
+	return err
+}
diff --git a/src/internal/syscall/windows/at_windows_test.go b/src/internal/syscall/windows/at_windows_test.go
new file mode 100644
index 00000000..7da9ecf0
--- /dev/null
+++ b/src/internal/syscall/windows/at_windows_test.go
@@ -0,0 +1,58 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package windows_test
+
+import (
+	"internal/syscall/windows"
+	"os"
+	"path/filepath"
+	"syscall"
+	"testing"
+)
+
+func TestOpen(t *testing.T) {
+	t.Parallel()
+
+	dir := t.TempDir()
+	file := filepath.Join(dir, "a")
+	f, err := os.Create(file)
+	if err != nil {
+		t.Fatal(err)
+	}
+	f.Close()
+
+	tests := []struct {
+		path string
+		flag int
+		err  error
+	}{
+		{dir, syscall.O_RDONLY, nil},
+		{dir, syscall.O_CREAT, nil},
+		{dir, syscall.O_RDONLY | syscall.O_CREAT, nil},
+		{file, syscall.O_APPEND | syscall.O_WRONLY | os.O_CREATE, nil},
+		{file, syscall.O_APPEND | syscall.O_WRONLY | os.O_CREATE | os.O_TRUNC, nil},
+		{dir, syscall.O_RDONLY | syscall.O_TRUNC, syscall.ERROR_ACCESS_DENIED},
+		{dir, syscall.O_WRONLY | syscall.O_RDWR, nil}, // TODO: syscall.Open returns EISDIR here, we should reconcile this
+		{dir, syscall.O_WRONLY, syscall.EISDIR},
+		{dir, syscall.O_RDWR, syscall.EISDIR},
+	}
+	for i, tt := range tests {
+		dir := filepath.Dir(tt.path)
+		dirfd, err := syscall.Open(dir, syscall.O_RDONLY, 0)
+		if err != nil {
+			t.Error(err)
+			continue
+		}
+		base := filepath.Base(tt.path)
+		h, err := windows.Openat(dirfd, base, tt.flag, 0o660)
+		syscall.CloseHandle(dirfd)
+		if err == nil {
+			syscall.CloseHandle(h)
+		}
+		if err != tt.err {
+			t.Errorf("%d: Open got %q, want %q", i, err, tt.err)
+		}
+	}
+}
diff --git a/src/internal/syscall/windows/security_windows.go b/src/internal/syscall/windows/security_windows.go
index c8c5cbed..017e25aa 100644
--- a/src/internal/syscall/windows/security_windows.go
+++ b/src/internal/syscall/windows/security_windows.go
@@ -5,6 +5,7 @@
 package windows
 
 import (
+	"runtime"
 	"syscall"
 	"unsafe"
 )
@@ -18,6 +19,8 @@ const (
 
 //sys	ImpersonateSelf(impersonationlevel uint32) (err error) = advapi32.ImpersonateSelf
 //sys	RevertToSelf() (err error) = advapi32.RevertToSelf
+//sys	ImpersonateLoggedOnUser(token syscall.Token) (err error) = advapi32.ImpersonateLoggedOnUser
+//sys	LogonUser(username *uint16, domain *uint16, password *uint16, logonType uint32, logonProvider uint32, token *syscall.Token) (err error) = advapi32.LogonUserW
 
 const (
 	TOKEN_ADJUST_PRIVILEGES = 0x0020
@@ -93,6 +96,26 @@ type LocalGroupUserInfo0 struct {
 	Name *uint16
 }
 
+const (
+	NERR_UserNotFound syscall.Errno = 2221
+	NERR_UserExists   syscall.Errno = 2224
+)
+
+const (
+	USER_PRIV_USER = 1
+)
+
+type UserInfo1 struct {
+	Name        *uint16
+	Password    *uint16
+	PasswordAge uint32
+	Priv        uint32
+	HomeDir     *uint16
+	Comment     *uint16
+	Flags       uint32
+	ScriptPath  *uint16
+}
+
 type UserInfo4 struct {
 	Name            *uint16
 	Password        *uint16
@@ -125,6 +148,8 @@ type UserInfo4 struct {
 	PasswordExpired uint32
 }
 
+//sys	NetUserAdd(serverName *uint16, level uint32, buf *byte, parmErr *uint32) (neterr error) = netapi32.NetUserAdd
+//sys	NetUserDel(serverName *uint16, userName *uint16) (neterr error) = netapi32.NetUserDel
 //sys	NetUserGetLocalGroups(serverName *uint16, userName *uint16, level uint32, flags uint32, buf **byte, prefMaxLen uint32, entriesRead *uint32, totalEntries *uint32) (neterr error) = netapi32.NetUserGetLocalGroups
 
 // GetSystemDirectory retrieves the path to current location of the system
@@ -132,3 +157,108 @@ type UserInfo4 struct {
 //
 //go:linkname GetSystemDirectory
 func GetSystemDirectory() string // Implemented in runtime package.
+
+// GetUserName retrieves the user name of the current thread
+// in the specified format.
+func GetUserName(format uint32) (string, error) {
+	n := uint32(50)
+	for {
+		b := make([]uint16, n)
+		e := syscall.GetUserNameEx(format, &b[0], &n)
+		if e == nil {
+			return syscall.UTF16ToString(b[:n]), nil
+		}
+		if e != syscall.ERROR_MORE_DATA {
+			return "", e
+		}
+		if n <= uint32(len(b)) {
+			return "", e
+		}
+	}
+}
+
+// getTokenInfo retrieves a specified type of information about an access token.
+func getTokenInfo(t syscall.Token, class uint32, initSize int) (unsafe.Pointer, error) {
+	n := uint32(initSize)
+	for {
+		b := make([]byte, n)
+		e := syscall.GetTokenInformation(t, class, &b[0], uint32(len(b)), &n)
+		if e == nil {
+			return unsafe.Pointer(&b[0]), nil
+		}
+		if e != syscall.ERROR_INSUFFICIENT_BUFFER {
+			return nil, e
+		}
+		if n <= uint32(len(b)) {
+			return nil, e
+		}
+	}
+}
+
+type TOKEN_GROUPS struct {
+	GroupCount uint32
+	Groups     [1]SID_AND_ATTRIBUTES
+}
+
+func (g *TOKEN_GROUPS) AllGroups() []SID_AND_ATTRIBUTES {
+	return (*[(1 << 28) - 1]SID_AND_ATTRIBUTES)(unsafe.Pointer(&g.Groups[0]))[:g.GroupCount:g.GroupCount]
+}
+
+func GetTokenGroups(t syscall.Token) (*TOKEN_GROUPS, error) {
+	i, e := getTokenInfo(t, syscall.TokenGroups, 50)
+	if e != nil {
+		return nil, e
+	}
+	return (*TOKEN_GROUPS)(i), nil
+}
+
+// https://learn.microsoft.com/en-us/windows/win32/api/winnt/ns-winnt-sid_identifier_authority
+type SID_IDENTIFIER_AUTHORITY struct {
+	Value [6]byte
+}
+
+const (
+	SID_REVISION = 1
+	// https://learn.microsoft.com/en-us/windows/win32/services/localsystem-account
+	SECURITY_LOCAL_SYSTEM_RID = 18
+	// https://learn.microsoft.com/en-us/windows/win32/services/localservice-account
+	SECURITY_LOCAL_SERVICE_RID = 19
+	// https://learn.microsoft.com/en-us/windows/win32/services/networkservice-account
+	SECURITY_NETWORK_SERVICE_RID = 20
+)
+
+var SECURITY_NT_AUTHORITY = SID_IDENTIFIER_AUTHORITY{
+	Value: [6]byte{0, 0, 0, 0, 0, 5},
+}
+
+//sys	IsValidSid(sid *syscall.SID) (valid bool) = advapi32.IsValidSid
+//sys	getSidIdentifierAuthority(sid *syscall.SID) (idauth uintptr) = advapi32.GetSidIdentifierAuthority
+//sys	getSidSubAuthority(sid *syscall.SID, subAuthorityIdx uint32) (subAuth uintptr) = advapi32.GetSidSubAuthority
+//sys	getSidSubAuthorityCount(sid *syscall.SID) (count uintptr) = advapi32.GetSidSubAuthorityCount
+
+// The following GetSid* functions are marked as //go:nocheckptr because checkptr
+// instrumentation can't see that the pointer returned by the syscall is pointing
+// into the sid's memory, which is normally allocated on the Go heap. Therefore,
+// the checkptr instrumentation would incorrectly flag the pointer dereference
+// as pointing to an invalid allocation.
+// Also, use runtime.KeepAlive to ensure that the sid is not garbage collected
+// before the GetSid* functions return, as the Go GC is not aware that the
+// pointers returned by the syscall are pointing into the sid's memory.
+
+//go:nocheckptr
+func GetSidIdentifierAuthority(sid *syscall.SID) SID_IDENTIFIER_AUTHORITY {
+	defer runtime.KeepAlive(sid)
+	return *(*SID_IDENTIFIER_AUTHORITY)(unsafe.Pointer(getSidIdentifierAuthority(sid)))
+}
+
+//go:nocheckptr
+func GetSidSubAuthority(sid *syscall.SID, subAuthorityIdx uint32) uint32 {
+	defer runtime.KeepAlive(sid)
+	return *(*uint32)(unsafe.Pointer(getSidSubAuthority(sid, subAuthorityIdx)))
+}
+
+//go:nocheckptr
+func GetSidSubAuthorityCount(sid *syscall.SID) uint8 {
+	defer runtime.KeepAlive(sid)
+	return *(*uint8)(unsafe.Pointer(getSidSubAuthorityCount(sid)))
+}
diff --git a/src/internal/syscall/windows/string_windows.go b/src/internal/syscall/windows/string_windows.go
new file mode 100644
index 00000000..eb6893d7
--- /dev/null
+++ b/src/internal/syscall/windows/string_windows.go
@@ -0,0 +1,32 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package windows
+
+import "syscall"
+
+// NTUnicodeString is a UTF-16 string for NT native APIs, corresponding to UNICODE_STRING.
+type NTUnicodeString struct {
+	Length        uint16
+	MaximumLength uint16
+	Buffer        *uint16
+}
+
+// NewNTUnicodeString returns a new NTUnicodeString structure for use with native
+// NT APIs that work over the NTUnicodeString type. Note that most Windows APIs
+// do not use NTUnicodeString, and instead UTF16PtrFromString should be used for
+// the more common *uint16 string type.
+func NewNTUnicodeString(s string) (*NTUnicodeString, error) {
+	s16, err := syscall.UTF16FromString(s)
+	if err != nil {
+		return nil, err
+	}
+	n := uint16(len(s16) * 2)
+	// https://learn.microsoft.com/en-us/windows-hardware/drivers/ddi/wdmsec/nf-wdmsec-wdmlibrtlinitunicodestringex
+	return &NTUnicodeString{
+		Length:        n - 2, // subtract 2 bytes for the NUL terminator
+		MaximumLength: n,
+		Buffer:        &s16[0],
+	}, nil
+}
diff --git a/src/internal/syscall/windows/syscall_windows.go b/src/internal/syscall/windows/syscall_windows.go
index b0b5a648..715d0724 100644
--- a/src/internal/syscall/windows/syscall_windows.go
+++ b/src/internal/syscall/windows/syscall_windows.go
@@ -39,7 +39,9 @@ const (
 	ERROR_CALL_NOT_IMPLEMENTED   syscall.Errno = 120
 	ERROR_INVALID_NAME           syscall.Errno = 123
 	ERROR_LOCK_FAILED            syscall.Errno = 167
+	ERROR_NO_TOKEN               syscall.Errno = 1008
 	ERROR_NO_UNICODE_TRANSLATION syscall.Errno = 1113
+	ERROR_CANT_ACCESS_FILE       syscall.Errno = 1920
 )
 
 const (
@@ -499,3 +501,37 @@ func QueryPerformanceCounter() int64 // Implemented in runtime package.
 //
 //go:linkname QueryPerformanceFrequency
 func QueryPerformanceFrequency() int64 // Implemented in runtime package.
+
+//sys   GetModuleHandle(modulename *uint16) (handle syscall.Handle, err error) = kernel32.GetModuleHandleW
+
+// NTStatus corresponds with NTSTATUS, error values returned by ntdll.dll and
+// other native functions.
+type NTStatus uint32
+
+func (s NTStatus) Errno() syscall.Errno {
+	return rtlNtStatusToDosErrorNoTeb(s)
+}
+
+func langID(pri, sub uint16) uint32 { return uint32(sub)<<10 | uint32(pri) }
+
+func (s NTStatus) Error() string {
+	return s.Errno().Error()
+}
+
+// x/sys/windows/mkerrors.bash can generate a complete list of NTStatus codes.
+//
+// At the moment, we only need a couple, so just put them here manually.
+// If this list starts getting long, we should consider generating the full set.
+const (
+	STATUS_FILE_IS_A_DIRECTORY       NTStatus = 0xC00000BA
+	STATUS_DIRECTORY_NOT_EMPTY       NTStatus = 0xC0000101
+	STATUS_NOT_A_DIRECTORY           NTStatus = 0xC0000103
+	STATUS_CANNOT_DELETE             NTStatus = 0xC0000121
+	STATUS_REPARSE_POINT_ENCOUNTERED NTStatus = 0xC000050B
+)
+
+// NT Native APIs
+//sys   NtCreateFile(handle *syscall.Handle, access uint32, oa *OBJECT_ATTRIBUTES, iosb *IO_STATUS_BLOCK, allocationSize *int64, attributes uint32, share uint32, disposition uint32, options uint32, eabuffer uintptr, ealength uint32) (ntstatus error) = ntdll.NtCreateFile
+//sys   NtOpenFile(handle *syscall.Handle, access uint32, oa *OBJECT_ATTRIBUTES, iosb *IO_STATUS_BLOCK, share uint32, options uint32) (ntstatus error) = ntdll.NtOpenFile
+//sys   rtlNtStatusToDosErrorNoTeb(ntstatus NTStatus) (ret syscall.Errno) = ntdll.RtlNtStatusToDosErrorNoTeb
+//sys   NtSetInformationFile(handle syscall.Handle, iosb *IO_STATUS_BLOCK, inBuffer uintptr, inBufferLen uint32, class uint32) (ntstatus error) = ntdll.NtSetInformationFile
diff --git a/src/internal/syscall/windows/types_windows.go b/src/internal/syscall/windows/types_windows.go
index 126e07b8..6ae37aff 100644
--- a/src/internal/syscall/windows/types_windows.go
+++ b/src/internal/syscall/windows/types_windows.go
@@ -4,9 +4,215 @@
 
 package windows
 
+import (
+	"syscall"
+	"unsafe"
+)
+
 // Socket related.
 const (
 	TCP_KEEPIDLE  = 0x03
 	TCP_KEEPCNT   = 0x10
 	TCP_KEEPINTVL = 0x11
 )
+
+const (
+	FILE_READ_DATA        = 0x00000001
+	FILE_READ_ATTRIBUTES  = 0x00000080
+	FILE_READ_EA          = 0x00000008
+	FILE_WRITE_DATA       = 0x00000002
+	FILE_WRITE_ATTRIBUTES = 0x00000100
+	FILE_WRITE_EA         = 0x00000010
+	FILE_APPEND_DATA      = 0x00000004
+	FILE_EXECUTE          = 0x00000020
+
+	FILE_GENERIC_READ    = STANDARD_RIGHTS_READ | FILE_READ_DATA | FILE_READ_ATTRIBUTES | FILE_READ_EA | SYNCHRONIZE
+	FILE_GENERIC_WRITE   = STANDARD_RIGHTS_WRITE | FILE_WRITE_DATA | FILE_WRITE_ATTRIBUTES | FILE_WRITE_EA | FILE_APPEND_DATA | SYNCHRONIZE
+	FILE_GENERIC_EXECUTE = STANDARD_RIGHTS_EXECUTE | FILE_READ_ATTRIBUTES | FILE_EXECUTE | SYNCHRONIZE
+
+	FILE_LIST_DIRECTORY = 0x00000001
+	FILE_TRAVERSE       = 0x00000020
+
+	FILE_SHARE_READ                      = 0x00000001
+	FILE_SHARE_WRITE                     = 0x00000002
+	FILE_SHARE_DELETE                    = 0x00000004
+	FILE_ATTRIBUTE_READONLY              = 0x00000001
+	FILE_ATTRIBUTE_HIDDEN                = 0x00000002
+	FILE_ATTRIBUTE_SYSTEM                = 0x00000004
+	FILE_ATTRIBUTE_DIRECTORY             = 0x00000010
+	FILE_ATTRIBUTE_ARCHIVE               = 0x00000020
+	FILE_ATTRIBUTE_DEVICE                = 0x00000040
+	FILE_ATTRIBUTE_NORMAL                = 0x00000080
+	FILE_ATTRIBUTE_TEMPORARY             = 0x00000100
+	FILE_ATTRIBUTE_SPARSE_FILE           = 0x00000200
+	FILE_ATTRIBUTE_REPARSE_POINT         = 0x00000400
+	FILE_ATTRIBUTE_COMPRESSED            = 0x00000800
+	FILE_ATTRIBUTE_OFFLINE               = 0x00001000
+	FILE_ATTRIBUTE_NOT_CONTENT_INDEXED   = 0x00002000
+	FILE_ATTRIBUTE_ENCRYPTED             = 0x00004000
+	FILE_ATTRIBUTE_INTEGRITY_STREAM      = 0x00008000
+	FILE_ATTRIBUTE_VIRTUAL               = 0x00010000
+	FILE_ATTRIBUTE_NO_SCRUB_DATA         = 0x00020000
+	FILE_ATTRIBUTE_RECALL_ON_OPEN        = 0x00040000
+	FILE_ATTRIBUTE_RECALL_ON_DATA_ACCESS = 0x00400000
+
+	INVALID_FILE_ATTRIBUTES = 0xffffffff
+)
+
+// https://learn.microsoft.com/en-us/windows/win32/secauthz/access-mask
+type ACCESS_MASK uint32
+
+// Constants for type ACCESS_MASK
+const (
+	DELETE                   = 0x00010000
+	READ_CONTROL             = 0x00020000
+	WRITE_DAC                = 0x00040000
+	WRITE_OWNER              = 0x00080000
+	SYNCHRONIZE              = 0x00100000
+	STANDARD_RIGHTS_REQUIRED = 0x000F0000
+	STANDARD_RIGHTS_READ     = READ_CONTROL
+	STANDARD_RIGHTS_WRITE    = READ_CONTROL
+	STANDARD_RIGHTS_EXECUTE  = READ_CONTROL
+	STANDARD_RIGHTS_ALL      = 0x001F0000
+	SPECIFIC_RIGHTS_ALL      = 0x0000FFFF
+	ACCESS_SYSTEM_SECURITY   = 0x01000000
+	MAXIMUM_ALLOWED          = 0x02000000
+	GENERIC_READ             = 0x80000000
+	GENERIC_WRITE            = 0x40000000
+	GENERIC_EXECUTE          = 0x20000000
+	GENERIC_ALL              = 0x10000000
+)
+
+// https://learn.microsoft.com/en-us/windows-hardware/drivers/ddi/wdm/ns-wdm-_acl
+type ACL struct {
+	AclRevision byte
+	Sbz1        byte
+	AclSize     uint16
+	AceCount    uint16
+	Sbz2        uint16
+}
+
+// https://learn.microsoft.com/en-us/windows-hardware/drivers/ddi/wdm/ns-wdm-_io_status_block
+type IO_STATUS_BLOCK struct {
+	Status      NTStatus
+	Information uintptr
+}
+
+// https://learn.microsoft.com/en-us/windows/win32/api/ntdef/ns-ntdef-_object_attributes
+type OBJECT_ATTRIBUTES struct {
+	Length             uint32
+	RootDirectory      syscall.Handle
+	ObjectName         *NTUnicodeString
+	Attributes         uint32
+	SecurityDescriptor *SECURITY_DESCRIPTOR
+	SecurityQoS        *SECURITY_QUALITY_OF_SERVICE
+}
+
+// init sets o's RootDirectory, ObjectName, and Length.
+func (o *OBJECT_ATTRIBUTES) init(root syscall.Handle, name string) error {
+	if name == "." {
+		name = ""
+	}
+	objectName, err := NewNTUnicodeString(name)
+	if err != nil {
+		return err
+	}
+	o.ObjectName = objectName
+	if root != syscall.InvalidHandle {
+		o.RootDirectory = root
+	}
+	o.Length = uint32(unsafe.Sizeof(*o))
+	return nil
+}
+
+// Values for the Attributes member of OBJECT_ATTRIBUTES.
+const (
+	OBJ_INHERIT                       = 0x00000002
+	OBJ_PERMANENT                     = 0x00000010
+	OBJ_EXCLUSIVE                     = 0x00000020
+	OBJ_CASE_INSENSITIVE              = 0x00000040
+	OBJ_OPENIF                        = 0x00000080
+	OBJ_OPENLINK                      = 0x00000100
+	OBJ_KERNEL_HANDLE                 = 0x00000200
+	OBJ_FORCE_ACCESS_CHECK            = 0x00000400
+	OBJ_IGNORE_IMPERSONATED_DEVICEMAP = 0x00000800
+	OBJ_DONT_REPARSE                  = 0x00001000
+	OBJ_VALID_ATTRIBUTES              = 0x00001FF2
+)
+
+// https://learn.microsoft.com/en-us/windows-hardware/drivers/ddi/ntifs/ns-ntifs-_security_descriptor
+type SECURITY_DESCRIPTOR struct {
+	revision byte
+	sbz1     byte
+	control  SECURITY_DESCRIPTOR_CONTROL
+	owner    *syscall.SID
+	group    *syscall.SID
+	sacl     *ACL
+	dacl     *ACL
+}
+
+// https://learn.microsoft.com/en-us/windows-hardware/drivers/ifs/security-descriptor-control
+type SECURITY_DESCRIPTOR_CONTROL uint16
+
+// https://learn.microsoft.com/en-us/windows/win32/api/winnt/ns-winnt-security_quality_of_service
+type SECURITY_QUALITY_OF_SERVICE struct {
+	Length              uint32
+	ImpersonationLevel  uint32 // type SECURITY_IMPERSONATION_LEVEL
+	ContextTrackingMode byte   // type SECURITY_CONTEXT_TRACKING_MODE
+	EffectiveOnly       byte
+}
+
+const (
+	// CreateDisposition flags for NtCreateFile and NtCreateNamedPipeFile.
+	FILE_SUPERSEDE           = 0x00000000
+	FILE_OPEN                = 0x00000001
+	FILE_CREATE              = 0x00000002
+	FILE_OPEN_IF             = 0x00000003
+	FILE_OVERWRITE           = 0x00000004
+	FILE_OVERWRITE_IF        = 0x00000005
+	FILE_MAXIMUM_DISPOSITION = 0x00000005
+
+	// CreateOptions flags for NtCreateFile and NtCreateNamedPipeFile.
+	FILE_DIRECTORY_FILE            = 0x00000001
+	FILE_WRITE_THROUGH             = 0x00000002
+	FILE_SEQUENTIAL_ONLY           = 0x00000004
+	FILE_NO_INTERMEDIATE_BUFFERING = 0x00000008
+	FILE_SYNCHRONOUS_IO_ALERT      = 0x00000010
+	FILE_SYNCHRONOUS_IO_NONALERT   = 0x00000020
+	FILE_NON_DIRECTORY_FILE        = 0x00000040
+	FILE_CREATE_TREE_CONNECTION    = 0x00000080
+	FILE_COMPLETE_IF_OPLOCKED      = 0x00000100
+	FILE_NO_EA_KNOWLEDGE           = 0x00000200
+	FILE_OPEN_REMOTE_INSTANCE      = 0x00000400
+	FILE_RANDOM_ACCESS             = 0x00000800
+	FILE_DELETE_ON_CLOSE           = 0x00001000
+	FILE_OPEN_BY_FILE_ID           = 0x00002000
+	FILE_OPEN_FOR_BACKUP_INTENT    = 0x00004000
+	FILE_NO_COMPRESSION            = 0x00008000
+	FILE_OPEN_REQUIRING_OPLOCK     = 0x00010000
+	FILE_DISALLOW_EXCLUSIVE        = 0x00020000
+	FILE_RESERVE_OPFILTER          = 0x00100000
+	FILE_OPEN_REPARSE_POINT        = 0x00200000
+	FILE_OPEN_NO_RECALL            = 0x00400000
+	FILE_OPEN_FOR_FREE_SPACE_QUERY = 0x00800000
+)
+
+// https://learn.microsoft.com/en-us/windows-hardware/drivers/ddi/ntddk/ns-ntddk-_file_disposition_information
+type FILE_DISPOSITION_INFORMATION struct {
+	DeleteFile bool
+}
+
+// https://learn.microsoft.com/en-us/windows-hardware/drivers/ddi/ntddk/ns-ntddk-_file_disposition_information_ex
+type FILE_DISPOSITION_INFORMATION_EX struct {
+	Flags uint32
+}
+
+// https://learn.microsoft.com/en-us/windows-hardware/drivers/ddi/ntddk/ns-ntddk-_file_disposition_information_ex
+const (
+	FILE_DISPOSITION_DO_NOT_DELETE             = 0x00000000
+	FILE_DISPOSITION_DELETE                    = 0x00000001
+	FILE_DISPOSITION_POSIX_SEMANTICS           = 0x00000002
+	FILE_DISPOSITION_FORCE_IMAGE_SECTION_CHECK = 0x00000004
+	FILE_DISPOSITION_ON_CLOSE                  = 0x00000008
+	FILE_DISPOSITION_IGNORE_READONLY_ATTRIBUTE = 0x00000010
+)
diff --git a/src/internal/syscall/windows/version_windows.go b/src/internal/syscall/windows/version_windows.go
index ff21fc59..cb5f6ba6 100644
--- a/src/internal/syscall/windows/version_windows.go
+++ b/src/internal/syscall/windows/version_windows.go
@@ -24,9 +24,9 @@ type _OSVERSIONINFOW struct {
 // According to documentation, RtlGetVersion function always succeeds.
 //sys	rtlGetVersion(info *_OSVERSIONINFOW) = ntdll.RtlGetVersion
 
-// version retrieves the major, minor, and build version numbers
+// Version retrieves the major, minor, and build version numbers
 // of the current Windows OS from the RtlGetVersion API.
-func version() (major, minor, build uint32) {
+func Version() (major, minor, build uint32) {
 	info := _OSVERSIONINFOW{}
 	info.osVersionInfoSize = uint32(unsafe.Sizeof(info))
 	rtlGetVersion(&info)
@@ -43,7 +43,7 @@ var initTCPKeepAlive = sync.OnceFunc(func() {
 	s, err := WSASocket(syscall.AF_INET, syscall.SOCK_STREAM, syscall.IPPROTO_TCP, nil, 0, WSA_FLAG_NO_HANDLE_INHERIT)
 	if err != nil {
 		// Fallback to checking the Windows version.
-		major, _, build := version()
+		major, _, build := Version()
 		supportTCPKeepAliveIdle = major >= 10 && build >= 16299
 		supportTCPKeepAliveInterval = major >= 10 && build >= 16299
 		supportTCPKeepAliveCount = major >= 10 && build >= 15063
@@ -59,7 +59,7 @@ var initTCPKeepAlive = sync.OnceFunc(func() {
 	supportTCPKeepAliveCount = optSupported(TCP_KEEPCNT)
 })
 
-// SupportTCPKeepAliveInterval indicates whether TCP_KEEPIDLE is supported.
+// SupportTCPKeepAliveIdle indicates whether TCP_KEEPIDLE is supported.
 // The minimal requirement is Windows 10.0.16299.
 func SupportTCPKeepAliveIdle() bool {
 	initTCPKeepAlive()
@@ -85,7 +85,7 @@ func SupportTCPKeepAliveCount() bool {
 // Windows version supports the TCP_INITIAL_RTO_NO_SYN_RETRANSMISSIONS.
 // The minimal requirement is Windows 10.0.16299.
 var SupportTCPInitialRTONoSYNRetransmissions = sync.OnceValue(func() bool {
-	major, _, build := version()
+	major, _, build := Version()
 	return major >= 10 && build >= 16299
 })
 
diff --git a/src/internal/syscall/windows/zsyscall_windows.go b/src/internal/syscall/windows/zsyscall_windows.go
index 062641cd..9a096cfc 100644
--- a/src/internal/syscall/windows/zsyscall_windows.go
+++ b/src/internal/syscall/windows/zsyscall_windows.go
@@ -48,7 +48,13 @@ var (
 
 	procAdjustTokenPrivileges             = modadvapi32.NewProc("AdjustTokenPrivileges")
 	procDuplicateTokenEx                  = modadvapi32.NewProc("DuplicateTokenEx")
+	procGetSidIdentifierAuthority         = modadvapi32.NewProc("GetSidIdentifierAuthority")
+	procGetSidSubAuthority                = modadvapi32.NewProc("GetSidSubAuthority")
+	procGetSidSubAuthorityCount           = modadvapi32.NewProc("GetSidSubAuthorityCount")
+	procImpersonateLoggedOnUser           = modadvapi32.NewProc("ImpersonateLoggedOnUser")
 	procImpersonateSelf                   = modadvapi32.NewProc("ImpersonateSelf")
+	procIsValidSid                        = modadvapi32.NewProc("IsValidSid")
+	procLogonUserW                        = modadvapi32.NewProc("LogonUserW")
 	procLookupPrivilegeValueW             = modadvapi32.NewProc("LookupPrivilegeValueW")
 	procOpenSCManagerW                    = modadvapi32.NewProc("OpenSCManagerW")
 	procOpenServiceW                      = modadvapi32.NewProc("OpenServiceW")
@@ -66,6 +72,7 @@ var (
 	procGetFileInformationByHandleEx      = modkernel32.NewProc("GetFileInformationByHandleEx")
 	procGetFinalPathNameByHandleW         = modkernel32.NewProc("GetFinalPathNameByHandleW")
 	procGetModuleFileNameW                = modkernel32.NewProc("GetModuleFileNameW")
+	procGetModuleHandleW                  = modkernel32.NewProc("GetModuleHandleW")
 	procGetTempPath2W                     = modkernel32.NewProc("GetTempPath2W")
 	procGetVolumeInformationByHandleW     = modkernel32.NewProc("GetVolumeInformationByHandleW")
 	procGetVolumeNameForVolumeMountPointW = modkernel32.NewProc("GetVolumeNameForVolumeMountPointW")
@@ -81,8 +88,14 @@ var (
 	procVirtualQuery                      = modkernel32.NewProc("VirtualQuery")
 	procNetShareAdd                       = modnetapi32.NewProc("NetShareAdd")
 	procNetShareDel                       = modnetapi32.NewProc("NetShareDel")
+	procNetUserAdd                        = modnetapi32.NewProc("NetUserAdd")
+	procNetUserDel                        = modnetapi32.NewProc("NetUserDel")
 	procNetUserGetLocalGroups             = modnetapi32.NewProc("NetUserGetLocalGroups")
+	procNtCreateFile                      = modntdll.NewProc("NtCreateFile")
+	procNtOpenFile                        = modntdll.NewProc("NtOpenFile")
+	procNtSetInformationFile              = modntdll.NewProc("NtSetInformationFile")
 	procRtlGetVersion                     = modntdll.NewProc("RtlGetVersion")
+	procRtlNtStatusToDosErrorNoTeb        = modntdll.NewProc("RtlNtStatusToDosErrorNoTeb")
 	procGetProcessMemoryInfo              = modpsapi.NewProc("GetProcessMemoryInfo")
 	procCreateEnvironmentBlock            = moduserenv.NewProc("CreateEnvironmentBlock")
 	procDestroyEnvironmentBlock           = moduserenv.NewProc("DestroyEnvironmentBlock")
@@ -112,6 +125,32 @@ func DuplicateTokenEx(hExistingToken syscall.Token, dwDesiredAccess uint32, lpTo
 	return
 }
 
+func getSidIdentifierAuthority(sid *syscall.SID) (idauth uintptr) {
+	r0, _, _ := syscall.Syscall(procGetSidIdentifierAuthority.Addr(), 1, uintptr(unsafe.Pointer(sid)), 0, 0)
+	idauth = uintptr(r0)
+	return
+}
+
+func getSidSubAuthority(sid *syscall.SID, subAuthorityIdx uint32) (subAuth uintptr) {
+	r0, _, _ := syscall.Syscall(procGetSidSubAuthority.Addr(), 2, uintptr(unsafe.Pointer(sid)), uintptr(subAuthorityIdx), 0)
+	subAuth = uintptr(r0)
+	return
+}
+
+func getSidSubAuthorityCount(sid *syscall.SID) (count uintptr) {
+	r0, _, _ := syscall.Syscall(procGetSidSubAuthorityCount.Addr(), 1, uintptr(unsafe.Pointer(sid)), 0, 0)
+	count = uintptr(r0)
+	return
+}
+
+func ImpersonateLoggedOnUser(token syscall.Token) (err error) {
+	r1, _, e1 := syscall.Syscall(procImpersonateLoggedOnUser.Addr(), 1, uintptr(token), 0, 0)
+	if r1 == 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
 func ImpersonateSelf(impersonationlevel uint32) (err error) {
 	r1, _, e1 := syscall.Syscall(procImpersonateSelf.Addr(), 1, uintptr(impersonationlevel), 0, 0)
 	if r1 == 0 {
@@ -120,6 +159,20 @@ func ImpersonateSelf(impersonationlevel uint32) (err error) {
 	return
 }
 
+func IsValidSid(sid *syscall.SID) (valid bool) {
+	r0, _, _ := syscall.Syscall(procIsValidSid.Addr(), 1, uintptr(unsafe.Pointer(sid)), 0, 0)
+	valid = r0 != 0
+	return
+}
+
+func LogonUser(username *uint16, domain *uint16, password *uint16, logonType uint32, logonProvider uint32, token *syscall.Token) (err error) {
+	r1, _, e1 := syscall.Syscall6(procLogonUserW.Addr(), 6, uintptr(unsafe.Pointer(username)), uintptr(unsafe.Pointer(domain)), uintptr(unsafe.Pointer(password)), uintptr(logonType), uintptr(logonProvider), uintptr(unsafe.Pointer(token)))
+	if r1 == 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
 func LookupPrivilegeValue(systemname *uint16, name *uint16, luid *LUID) (err error) {
 	r1, _, e1 := syscall.Syscall(procLookupPrivilegeValueW.Addr(), 3, uintptr(unsafe.Pointer(systemname)), uintptr(unsafe.Pointer(name)), uintptr(unsafe.Pointer(luid)))
 	if r1 == 0 {
@@ -266,6 +319,15 @@ func GetModuleFileName(module syscall.Handle, fn *uint16, len uint32) (n uint32,
 	return
 }
 
+func GetModuleHandle(modulename *uint16) (handle syscall.Handle, err error) {
+	r0, _, e1 := syscall.Syscall(procGetModuleHandleW.Addr(), 1, uintptr(unsafe.Pointer(modulename)), 0, 0)
+	handle = syscall.Handle(r0)
+	if handle == 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
 func GetTempPath2(buflen uint32, buf *uint16) (n uint32, err error) {
 	r0, _, e1 := syscall.Syscall(procGetTempPath2W.Addr(), 2, uintptr(buflen), uintptr(unsafe.Pointer(buf)), 0)
 	n = uint32(r0)
@@ -384,6 +446,22 @@ func NetShareDel(serverName *uint16, netName *uint16, reserved uint32) (neterr e
 	return
 }
 
+func NetUserAdd(serverName *uint16, level uint32, buf *byte, parmErr *uint32) (neterr error) {
+	r0, _, _ := syscall.Syscall6(procNetUserAdd.Addr(), 4, uintptr(unsafe.Pointer(serverName)), uintptr(level), uintptr(unsafe.Pointer(buf)), uintptr(unsafe.Pointer(parmErr)), 0, 0)
+	if r0 != 0 {
+		neterr = syscall.Errno(r0)
+	}
+	return
+}
+
+func NetUserDel(serverName *uint16, userName *uint16) (neterr error) {
+	r0, _, _ := syscall.Syscall(procNetUserDel.Addr(), 2, uintptr(unsafe.Pointer(serverName)), uintptr(unsafe.Pointer(userName)), 0)
+	if r0 != 0 {
+		neterr = syscall.Errno(r0)
+	}
+	return
+}
+
 func NetUserGetLocalGroups(serverName *uint16, userName *uint16, level uint32, flags uint32, buf **byte, prefMaxLen uint32, entriesRead *uint32, totalEntries *uint32) (neterr error) {
 	r0, _, _ := syscall.Syscall9(procNetUserGetLocalGroups.Addr(), 8, uintptr(unsafe.Pointer(serverName)), uintptr(unsafe.Pointer(userName)), uintptr(level), uintptr(flags), uintptr(unsafe.Pointer(buf)), uintptr(prefMaxLen), uintptr(unsafe.Pointer(entriesRead)), uintptr(unsafe.Pointer(totalEntries)), 0)
 	if r0 != 0 {
@@ -392,11 +470,41 @@ func NetUserGetLocalGroups(serverName *uint16, userName *uint16, level uint32, f
 	return
 }
 
+func NtCreateFile(handle *syscall.Handle, access uint32, oa *OBJECT_ATTRIBUTES, iosb *IO_STATUS_BLOCK, allocationSize *int64, attributes uint32, share uint32, disposition uint32, options uint32, eabuffer uintptr, ealength uint32) (ntstatus error) {
+	r0, _, _ := syscall.Syscall12(procNtCreateFile.Addr(), 11, uintptr(unsafe.Pointer(handle)), uintptr(access), uintptr(unsafe.Pointer(oa)), uintptr(unsafe.Pointer(iosb)), uintptr(unsafe.Pointer(allocationSize)), uintptr(attributes), uintptr(share), uintptr(disposition), uintptr(options), uintptr(eabuffer), uintptr(ealength), 0)
+	if r0 != 0 {
+		ntstatus = NTStatus(r0)
+	}
+	return
+}
+
+func NtOpenFile(handle *syscall.Handle, access uint32, oa *OBJECT_ATTRIBUTES, iosb *IO_STATUS_BLOCK, share uint32, options uint32) (ntstatus error) {
+	r0, _, _ := syscall.Syscall6(procNtOpenFile.Addr(), 6, uintptr(unsafe.Pointer(handle)), uintptr(access), uintptr(unsafe.Pointer(oa)), uintptr(unsafe.Pointer(iosb)), uintptr(share), uintptr(options))
+	if r0 != 0 {
+		ntstatus = NTStatus(r0)
+	}
+	return
+}
+
+func NtSetInformationFile(handle syscall.Handle, iosb *IO_STATUS_BLOCK, inBuffer uintptr, inBufferLen uint32, class uint32) (ntstatus error) {
+	r0, _, _ := syscall.Syscall6(procNtSetInformationFile.Addr(), 5, uintptr(handle), uintptr(unsafe.Pointer(iosb)), uintptr(inBuffer), uintptr(inBufferLen), uintptr(class), 0)
+	if r0 != 0 {
+		ntstatus = NTStatus(r0)
+	}
+	return
+}
+
 func rtlGetVersion(info *_OSVERSIONINFOW) {
 	syscall.Syscall(procRtlGetVersion.Addr(), 1, uintptr(unsafe.Pointer(info)), 0, 0)
 	return
 }
 
+func rtlNtStatusToDosErrorNoTeb(ntstatus NTStatus) (ret syscall.Errno) {
+	r0, _, _ := syscall.Syscall(procRtlNtStatusToDosErrorNoTeb.Addr(), 1, uintptr(ntstatus), 0, 0)
+	ret = syscall.Errno(r0)
+	return
+}
+
 func GetProcessMemoryInfo(handle syscall.Handle, memCounters *PROCESS_MEMORY_COUNTERS, cb uint32) (err error) {
 	r1, _, e1 := syscall.Syscall(procGetProcessMemoryInfo.Addr(), 3, uintptr(handle), uintptr(unsafe.Pointer(memCounters)), uintptr(cb))
 	if r1 == 0 {
diff --git a/src/go/build/syslist.go b/src/internal/syslist/syslist.go
similarity index 75%
rename from src/go/build/syslist.go
rename to src/internal/syslist/syslist.go
index 783bbe69..2349b6ea 100644
--- a/src/go/build/syslist.go
+++ b/src/internal/syslist/syslist.go
@@ -2,16 +2,19 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-package build
+// Package syslist stores tables of OS and ARCH names that are
+// (or at one point were) acceptable build targets.
+
+package syslist
 
 // Note that this file is read by internal/goarch/gengoarch.go and by
 // internal/goos/gengoos.go. If you change this file, look at those
 // files as well.
 
-// knownOS is the list of past, present, and future known GOOS values.
+// KnownOS is the list of past, present, and future known GOOS values.
 // Do not remove from this list, as it is used for filename matching.
-// If you add an entry to this list, look at unixOS, below.
-var knownOS = map[string]bool{
+// If you add an entry to this list, look at UnixOS, below.
+var KnownOS = map[string]bool{
 	"aix":       true,
 	"android":   true,
 	"darwin":    true,
@@ -32,11 +35,10 @@ var knownOS = map[string]bool{
 	"zos":       true,
 }
 
-// unixOS is the set of GOOS values matched by the "unix" build tag.
+// UnixOS is the set of GOOS values matched by the "unix" build tag.
 // This is not used for filename matching.
-// This list also appears in cmd/dist/build.go and
-// cmd/go/internal/imports/build.go.
-var unixOS = map[string]bool{
+// This list also appears in cmd/dist/build.go.
+var UnixOS = map[string]bool{
 	"aix":       true,
 	"android":   true,
 	"darwin":    true,
@@ -51,9 +53,9 @@ var unixOS = map[string]bool{
 	"solaris":   true,
 }
 
-// knownArch is the list of past, present, and future known GOARCH values.
+// KnownArch is the list of past, present, and future known GOARCH values.
 // Do not remove from this list, as it is used for filename matching.
-var knownArch = map[string]bool{
+var KnownArch = map[string]bool{
 	"386":         true,
 	"amd64":       true,
 	"amd64p32":    true,
diff --git a/src/internal/testenv/exec.go b/src/internal/testenv/exec.go
index 7f6ad5ca..7b251b60 100644
--- a/src/internal/testenv/exec.go
+++ b/src/internal/testenv/exec.go
@@ -31,20 +31,17 @@ import (
 // If exec is not supported, testenv.SyscallIsNotSupported will return true
 // for the resulting error.
 func MustHaveExec(t testing.TB) {
-	tryExecOnce.Do(func() {
-		tryExecErr = tryExec()
-	})
-	if tryExecErr != nil {
-		t.Skipf("skipping test: cannot exec subprocess on %s/%s: %v", runtime.GOOS, runtime.GOARCH, tryExecErr)
+	if err := tryExec(); err != nil {
+		msg := fmt.Sprintf("cannot exec subprocess on %s/%s: %v", runtime.GOOS, runtime.GOARCH, err)
+		if t == nil {
+			panic(msg)
+		}
+		t.Helper()
+		t.Skip("skipping test:", msg)
 	}
 }
 
-var (
-	tryExecOnce sync.Once
-	tryExecErr  error
-)
-
-func tryExec() error {
+var tryExec = sync.OnceValue(func() error {
 	switch runtime.GOOS {
 	case "wasip1", "js", "ios":
 	default:
@@ -70,15 +67,37 @@ func tryExec() error {
 
 	// We know that this is a test executable. We should be able to run it with a
 	// no-op flag to check for overall exec support.
-	exe, err := os.Executable()
+	exe, err := exePath()
 	if err != nil {
 		return fmt.Errorf("can't probe for exec support: %w", err)
 	}
 	cmd := exec.Command(exe, "-test.list=^$")
 	cmd.Env = origEnv
 	return cmd.Run()
+})
+
+// Executable is a wrapper around [MustHaveExec] and [os.Executable].
+// It returns the path name for the executable that started the current process,
+// or skips the test if the current system can't start new processes,
+// or fails the test if the path can not be obtained.
+func Executable(t testing.TB) string {
+	MustHaveExec(t)
+
+	exe, err := exePath()
+	if err != nil {
+		msg := fmt.Sprintf("os.Executable error: %v", err)
+		if t == nil {
+			panic(msg)
+		}
+		t.Fatal(msg)
+	}
+	return exe
 }
 
+var exePath = sync.OnceValues(func() (string, error) {
+	return os.Executable()
+})
+
 var execPaths sync.Map // path -> error
 
 // MustHaveExecPath checks that the current system can start the named executable
@@ -93,6 +112,7 @@ func MustHaveExecPath(t testing.TB, path string) {
 		err, _ = execPaths.LoadOrStore(path, err)
 	}
 	if err != nil {
+		t.Helper()
 		t.Skipf("skipping test: %s: %s", path, err)
 	}
 }
diff --git a/src/internal/testenv/testenv.go b/src/internal/testenv/testenv.go
index 9fb92406..9aecfaa6 100644
--- a/src/internal/testenv/testenv.go
+++ b/src/internal/testenv/testenv.go
@@ -53,63 +53,59 @@ func HasGoBuild() bool {
 		return false
 	}
 
-	goBuildOnce.Do(func() {
-		// To run 'go build', we need to be able to exec a 'go' command.
-		// We somewhat arbitrarily choose to exec 'go tool -n compile' because that
-		// also confirms that cmd/go can find the compiler. (Before CL 472096,
-		// we sometimes ended up with cmd/go installed in the test environment
-		// without a cmd/compile it could use to actually build things.)
-		cmd := exec.Command("go", "tool", "-n", "compile")
-		cmd.Env = origEnv
-		out, err := cmd.Output()
-		if err != nil {
-			goBuildErr = fmt.Errorf("%v: %w", cmd, err)
-			return
-		}
-		out = bytes.TrimSpace(out)
-		if len(out) == 0 {
-			goBuildErr = fmt.Errorf("%v: no tool reported", cmd)
-			return
-		}
-		if _, err := exec.LookPath(string(out)); err != nil {
-			goBuildErr = err
-			return
-		}
-
-		if platform.MustLinkExternal(runtime.GOOS, runtime.GOARCH, false) {
-			// We can assume that we always have a complete Go toolchain available.
-			// However, this platform requires a C linker to build even pure Go
-			// programs, including tests. Do we have one in the test environment?
-			// (On Android, for example, the device running the test might not have a
-			// C toolchain installed.)
-			//
-			// If CC is set explicitly, assume that we do. Otherwise, use 'go env CC'
-			// to determine which toolchain it would use by default.
-			if os.Getenv("CC") == "" {
-				cmd := exec.Command("go", "env", "CC")
-				cmd.Env = origEnv
-				out, err := cmd.Output()
-				if err != nil {
-					goBuildErr = fmt.Errorf("%v: %w", cmd, err)
-					return
-				}
-				out = bytes.TrimSpace(out)
-				if len(out) == 0 {
-					goBuildErr = fmt.Errorf("%v: no CC reported", cmd)
-					return
-				}
-				_, goBuildErr = exec.LookPath(string(out))
-			}
-		}
-	})
-
-	return goBuildErr == nil
+	return tryGoBuild() == nil
 }
 
-var (
-	goBuildOnce sync.Once
-	goBuildErr  error
-)
+var tryGoBuild = sync.OnceValue(func() error {
+	// To run 'go build', we need to be able to exec a 'go' command.
+	// We somewhat arbitrarily choose to exec 'go tool -n compile' because that
+	// also confirms that cmd/go can find the compiler. (Before CL 472096,
+	// we sometimes ended up with cmd/go installed in the test environment
+	// without a cmd/compile it could use to actually build things.)
+	goTool, err := goTool()
+	if err != nil {
+		return err
+	}
+	cmd := exec.Command(goTool, "tool", "-n", "compile")
+	cmd.Env = origEnv
+	out, err := cmd.Output()
+	if err != nil {
+		return fmt.Errorf("%v: %w", cmd, err)
+	}
+	out = bytes.TrimSpace(out)
+	if len(out) == 0 {
+		return fmt.Errorf("%v: no tool reported", cmd)
+	}
+	if _, err := exec.LookPath(string(out)); err != nil {
+		return err
+	}
+
+	if platform.MustLinkExternal(runtime.GOOS, runtime.GOARCH, false) {
+		// We can assume that we always have a complete Go toolchain available.
+		// However, this platform requires a C linker to build even pure Go
+		// programs, including tests. Do we have one in the test environment?
+		// (On Android, for example, the device running the test might not have a
+		// C toolchain installed.)
+		//
+		// If CC is set explicitly, assume that we do. Otherwise, use 'go env CC'
+		// to determine which toolchain it would use by default.
+		if os.Getenv("CC") == "" {
+			cmd := exec.Command(goTool, "env", "CC")
+			cmd.Env = origEnv
+			out, err := cmd.Output()
+			if err != nil {
+				return fmt.Errorf("%v: %w", cmd, err)
+			}
+			out = bytes.TrimSpace(out)
+			if len(out) == 0 {
+				return fmt.Errorf("%v: no CC reported", cmd)
+			}
+			_, err = exec.LookPath(string(out))
+			return err
+		}
+	}
+	return nil
+})
 
 // MustHaveGoBuild checks that the current system can build programs with “go build”
 // and then run them with os.StartProcess or exec.Command.
@@ -121,7 +117,7 @@ func MustHaveGoBuild(t testing.TB) {
 	}
 	if !HasGoBuild() {
 		t.Helper()
-		t.Skipf("skipping test: 'go build' unavailable: %v", goBuildErr)
+		t.Skipf("skipping test: 'go build' unavailable: %v", tryGoBuild())
 	}
 }
 
@@ -135,6 +131,7 @@ func HasGoRun() bool {
 // If not, MustHaveGoRun calls t.Skip with an explanation.
 func MustHaveGoRun(t testing.TB) {
 	if !HasGoRun() {
+		t.Helper()
 		t.Skipf("skipping test: 'go run' not available on %s/%s", runtime.GOOS, runtime.GOARCH)
 	}
 }
@@ -154,6 +151,7 @@ func HasParallelism() bool {
 // threads in parallel. If not, MustHaveParallelism calls t.Skip with an explanation.
 func MustHaveParallelism(t testing.TB) {
 	if !HasParallelism() {
+		t.Helper()
 		t.Skipf("skipping test: no parallelism available on %s/%s", runtime.GOOS, runtime.GOARCH)
 	}
 }
@@ -177,82 +175,67 @@ func GoToolPath(t testing.TB) string {
 	return path
 }
 
-var (
-	gorootOnce sync.Once
-	gorootPath string
-	gorootErr  error
-)
+var findGOROOT = sync.OnceValues(func() (path string, err error) {
+	if path := runtime.GOROOT(); path != "" {
+		// If runtime.GOROOT() is non-empty, assume that it is valid.
+		//
+		// (It might not be: for example, the user may have explicitly set GOROOT
+		// to the wrong directory. But this case is
+		// rare, and if that happens the user can fix what they broke.)
+		return path, nil
+	}
 
-func findGOROOT() (string, error) {
-	gorootOnce.Do(func() {
-		gorootPath = runtime.GOROOT()
-		if gorootPath != "" {
-			// If runtime.GOROOT() is non-empty, assume that it is valid.
-			//
-			// (It might not be: for example, the user may have explicitly set GOROOT
-			// to the wrong directory. But this case is
-			// rare, and if that happens the user can fix what they broke.)
-			return
+	// runtime.GOROOT doesn't know where GOROOT is (perhaps because the test
+	// binary was built with -trimpath).
+	//
+	// Since this is internal/testenv, we can cheat and assume that the caller
+	// is a test of some package in a subdirectory of GOROOT/src. ('go test'
+	// runs the test in the directory containing the packaged under test.) That
+	// means that if we start walking up the tree, we should eventually find
+	// GOROOT/src/go.mod, and we can report the parent directory of that.
+	//
+	// Notably, this works even if we can't run 'go env GOROOT' as a
+	// subprocess.
+
+	cwd, err := os.Getwd()
+	if err != nil {
+		return "", fmt.Errorf("finding GOROOT: %w", err)
+	}
+
+	dir := cwd
+	for {
+		parent := filepath.Dir(dir)
+		if parent == dir {
+			// dir is either "." or only a volume name.
+			return "", fmt.Errorf("failed to locate GOROOT/src in any parent directory")
 		}
 
-		// runtime.GOROOT doesn't know where GOROOT is (perhaps because the test
-		// binary was built with -trimpath).
-		//
-		// Since this is internal/testenv, we can cheat and assume that the caller
-		// is a test of some package in a subdirectory of GOROOT/src. ('go test'
-		// runs the test in the directory containing the packaged under test.) That
-		// means that if we start walking up the tree, we should eventually find
-		// GOROOT/src/go.mod, and we can report the parent directory of that.
-		//
-		// Notably, this works even if we can't run 'go env GOROOT' as a
-		// subprocess.
+		if base := filepath.Base(dir); base != "src" {
+			dir = parent
+			continue // dir cannot be GOROOT/src if it doesn't end in "src".
+		}
 
-		cwd, err := os.Getwd()
+		b, err := os.ReadFile(filepath.Join(dir, "go.mod"))
 		if err != nil {
-			gorootErr = fmt.Errorf("finding GOROOT: %w", err)
-			return
-		}
-
-		dir := cwd
-		for {
-			parent := filepath.Dir(dir)
-			if parent == dir {
-				// dir is either "." or only a volume name.
-				gorootErr = fmt.Errorf("failed to locate GOROOT/src in any parent directory")
-				return
-			}
-
-			if base := filepath.Base(dir); base != "src" {
+			if os.IsNotExist(err) {
 				dir = parent
-				continue // dir cannot be GOROOT/src if it doesn't end in "src".
+				continue
 			}
+			return "", fmt.Errorf("finding GOROOT: %w", err)
+		}
+		goMod := string(b)
 
-			b, err := os.ReadFile(filepath.Join(dir, "go.mod"))
-			if err != nil {
-				if os.IsNotExist(err) {
-					dir = parent
-					continue
-				}
-				gorootErr = fmt.Errorf("finding GOROOT: %w", err)
-				return
-			}
-			goMod := string(b)
-
-			for goMod != "" {
-				var line string
-				line, goMod, _ = strings.Cut(goMod, "\n")
-				fields := strings.Fields(line)
-				if len(fields) >= 2 && fields[0] == "module" && fields[1] == "std" {
-					// Found "module std", which is the module declaration in GOROOT/src!
-					gorootPath = parent
-					return
-				}
+		for goMod != "" {
+			var line string
+			line, goMod, _ = strings.Cut(goMod, "\n")
+			fields := strings.Fields(line)
+			if len(fields) >= 2 && fields[0] == "module" && fields[1] == "std" {
+				// Found "module std", which is the module declaration in GOROOT/src!
+				return parent, nil
 			}
 		}
-	})
-
-	return gorootPath, gorootErr
-}
+	}
+})
 
 // GOROOT reports the path to the directory containing the root of the Go
 // project source tree. This is normally equivalent to runtime.GOROOT, but
@@ -278,25 +261,21 @@ func GoTool() (string, error) {
 	if !HasGoBuild() {
 		return "", errors.New("platform cannot run go tool")
 	}
-	goToolOnce.Do(func() {
-		goToolPath, goToolErr = exec.LookPath("go")
-	})
-	return goToolPath, goToolErr
+	return goTool()
 }
 
-var (
-	goToolOnce sync.Once
-	goToolPath string
-	goToolErr  error
-)
+var goTool = sync.OnceValues(func() (string, error) {
+	return exec.LookPath("go")
+})
 
-// HasSrc reports whether the entire source tree is available under GOROOT.
-func HasSrc() bool {
+// MustHaveSource checks that the entire source tree is available under GOROOT.
+// If not, it calls t.Skip with an explanation.
+func MustHaveSource(t testing.TB) {
 	switch runtime.GOOS {
 	case "ios":
-		return false
+		t.Helper()
+		t.Skip("skipping test: no source tree on " + runtime.GOOS)
 	}
-	return true
 }
 
 // HasExternalNetwork reports whether the current system can use
@@ -321,33 +300,31 @@ func MustHaveExternalNetwork(t testing.TB) {
 
 // HasCGO reports whether the current system can use cgo.
 func HasCGO() bool {
-	hasCgoOnce.Do(func() {
-		goTool, err := GoTool()
-		if err != nil {
-			return
-		}
-		cmd := exec.Command(goTool, "env", "CGO_ENABLED")
-		cmd.Env = origEnv
-		out, err := cmd.Output()
-		if err != nil {
-			panic(fmt.Sprintf("%v: %v", cmd, out))
-		}
-		hasCgo, err = strconv.ParseBool(string(bytes.TrimSpace(out)))
-		if err != nil {
-			panic(fmt.Sprintf("%v: non-boolean output %q", cmd, out))
-		}
-	})
-	return hasCgo
+	return hasCgo()
 }
 
-var (
-	hasCgoOnce sync.Once
-	hasCgo     bool
-)
+var hasCgo = sync.OnceValue(func() bool {
+	goTool, err := goTool()
+	if err != nil {
+		return false
+	}
+	cmd := exec.Command(goTool, "env", "CGO_ENABLED")
+	cmd.Env = origEnv
+	out, err := cmd.Output()
+	if err != nil {
+		panic(fmt.Sprintf("%v: %v", cmd, out))
+	}
+	ok, err := strconv.ParseBool(string(bytes.TrimSpace(out)))
+	if err != nil {
+		panic(fmt.Sprintf("%v: non-boolean output %q", cmd, out))
+	}
+	return ok
+})
 
 // MustHaveCGO calls t.Skip if cgo is not available.
 func MustHaveCGO(t testing.TB) {
 	if !HasCGO() {
+		t.Helper()
 		t.Skipf("skipping test: no cgo")
 	}
 }
@@ -363,6 +340,7 @@ func CanInternalLink(withCgo bool) bool {
 // If not, MustInternalLink calls t.Skip with an explanation.
 func MustInternalLink(t testing.TB, withCgo bool) {
 	if !CanInternalLink(withCgo) {
+		t.Helper()
 		if withCgo && CanInternalLink(false) {
 			t.Skipf("skipping test: internal linking on %s/%s is not supported with cgo", runtime.GOOS, runtime.GOARCH)
 		}
@@ -375,6 +353,7 @@ func MustInternalLink(t testing.TB, withCgo bool) {
 // If not, MustInternalLinkPIE calls t.Skip with an explanation.
 func MustInternalLinkPIE(t testing.TB) {
 	if !platform.InternalLinkPIESupported(runtime.GOOS, runtime.GOARCH) {
+		t.Helper()
 		t.Skipf("skipping test: internal linking for buildmode=pie on %s/%s is not supported", runtime.GOOS, runtime.GOARCH)
 	}
 }
@@ -384,6 +363,7 @@ func MustInternalLinkPIE(t testing.TB) {
 // If not, MustHaveBuildMode calls t.Skip with an explanation.
 func MustHaveBuildMode(t testing.TB, buildmode string) {
 	if !platform.BuildModeSupported(runtime.Compiler, buildmode, runtime.GOOS, runtime.GOARCH) {
+		t.Helper()
 		t.Skipf("skipping test: build mode %s on %s/%s is not supported by the %s compiler", buildmode, runtime.GOOS, runtime.GOARCH, runtime.Compiler)
 	}
 }
@@ -399,6 +379,7 @@ func HasSymlink() bool {
 func MustHaveSymlink(t testing.TB) {
 	ok, reason := hasSymlink()
 	if !ok {
+		t.Helper()
 		t.Skipf("skipping test: cannot make symlinks on %s/%s: %s", runtime.GOOS, runtime.GOARCH, reason)
 	}
 }
@@ -415,6 +396,7 @@ func HasLink() bool {
 // If not, MustHaveLink calls t.Skip with an explanation.
 func MustHaveLink(t testing.TB) {
 	if !HasLink() {
+		t.Helper()
 		t.Skipf("skipping test: hardlinks are not supported on %s/%s", runtime.GOOS, runtime.GOARCH)
 	}
 }
@@ -422,15 +404,15 @@ func MustHaveLink(t testing.TB) {
 var flaky = flag.Bool("flaky", false, "run known-flaky tests too")
 
 func SkipFlaky(t testing.TB, issue int) {
-	t.Helper()
 	if !*flaky {
+		t.Helper()
 		t.Skipf("skipping known flaky test without the -flaky flag; see golang.org/issue/%d", issue)
 	}
 }
 
 func SkipFlakyNet(t testing.TB) {
-	t.Helper()
 	if v, _ := strconv.ParseBool(os.Getenv("GO_BUILDER_FLAKY_NET")); v {
+		t.Helper()
 		t.Skip("skipping test on builder known to have frequent network failures")
 	}
 }
diff --git a/src/internal/testenv/testenv_notwin.go b/src/internal/testenv/testenv_notwin.go
index 30e159a6..9dddea94 100644
--- a/src/internal/testenv/testenv_notwin.go
+++ b/src/internal/testenv/testenv_notwin.go
@@ -11,9 +11,10 @@ import (
 	"os"
 	"path/filepath"
 	"runtime"
+	"sync"
 )
 
-func hasSymlink() (ok bool, reason string) {
+var hasSymlink = sync.OnceValues(func() (ok bool, reason string) {
 	switch runtime.GOOS {
 	case "plan9":
 		return false, ""
@@ -43,4 +44,4 @@ func hasSymlink() (ok bool, reason string) {
 	}
 
 	return true, ""
-}
+})
diff --git a/src/internal/testenv/testenv_windows.go b/src/internal/testenv/testenv_windows.go
index 4802b139..eed53cdf 100644
--- a/src/internal/testenv/testenv_windows.go
+++ b/src/internal/testenv/testenv_windows.go
@@ -5,16 +5,14 @@
 package testenv
 
 import (
+	"errors"
 	"os"
 	"path/filepath"
 	"sync"
 	"syscall"
 )
 
-var symlinkOnce sync.Once
-var winSymlinkErr error
-
-func initWinHasSymlink() {
+var hasSymlink = sync.OnceValues(func() (bool, string) {
 	tmpdir, err := os.MkdirTemp("", "symtest")
 	if err != nil {
 		panic("failed to create temp directory: " + err.Error())
@@ -22,26 +20,13 @@ func initWinHasSymlink() {
 	defer os.RemoveAll(tmpdir)
 
 	err = os.Symlink("target", filepath.Join(tmpdir, "symlink"))
-	if err != nil {
-		err = err.(*os.LinkError).Err
-		switch err {
-		case syscall.EWINDOWS, syscall.ERROR_PRIVILEGE_NOT_HELD:
-			winSymlinkErr = err
-		}
-	}
-}
-
-func hasSymlink() (ok bool, reason string) {
-	symlinkOnce.Do(initWinHasSymlink)
-
-	switch winSymlinkErr {
-	case nil:
+	switch {
+	case err == nil:
 		return true, ""
-	case syscall.EWINDOWS:
+	case errors.Is(err, syscall.EWINDOWS):
 		return false, ": symlinks are not supported on your version of Windows"
-	case syscall.ERROR_PRIVILEGE_NOT_HELD:
+	case errors.Is(err, syscall.ERROR_PRIVILEGE_NOT_HELD):
 		return false, ": you don't have enough privileges to create symlinks"
 	}
-
 	return false, ""
-}
+})
diff --git a/src/internal/testlog/log.go b/src/internal/testlog/log.go
index 3c5f780a..d8b9dcfa 100644
--- a/src/internal/testlog/log.go
+++ b/src/internal/testlog/log.go
@@ -21,20 +21,19 @@ type Interface interface {
 }
 
 // logger is the current logger Interface.
-// We use an atomic.Value in case test startup
+// We use an atomic.Pointer in case test startup
 // is racing with goroutines started during init.
 // That must not cause a race detector failure,
 // although it will still result in limited visibility
 // into exactly what those goroutines do.
-var logger atomic.Value
+var logger atomic.Pointer[Interface]
 
 // SetLogger sets the test logger implementation for the current process.
 // It must be called only once, at process startup.
 func SetLogger(impl Interface) {
-	if logger.Load() != nil {
+	if !logger.CompareAndSwap(nil, &impl) {
 		panic("testlog: SetLogger must be called only once")
 	}
-	logger.Store(&impl)
 }
 
 // Logger returns the current test logger implementation.
@@ -44,7 +43,7 @@ func Logger() Interface {
 	if impl == nil {
 		return nil
 	}
-	return *impl.(*Interface)
+	return *impl
 }
 
 // Getenv calls Logger().Getenv, if a logger has been set.
diff --git a/src/internal/trace/base.go b/src/internal/trace/base.go
index 4cbd3e64..4f4ce486 100644
--- a/src/internal/trace/base.go
+++ b/src/internal/trace/base.go
@@ -19,11 +19,7 @@ import (
 
 // maxArgs is the maximum number of arguments for "plain" events,
 // i.e. anything that could reasonably be represented as a baseEvent.
-//
-// TODO(mknyszek): This is only 6 instead of 5 because GoStatusStack
-// has 5 arguments and needs to smuggle in a 6th. Figure out a way to
-// shrink this in the future.
-const maxArgs = 6
+const maxArgs = 5
 
 // timedEventArgs is an array that is able to hold the arguments for any
 // timed event.
diff --git a/src/internal/trace/event.go b/src/internal/trace/event.go
index a5d5637e..a5c5aec2 100644
--- a/src/internal/trace/event.go
+++ b/src/internal/trace/event.go
@@ -6,6 +6,7 @@ package trace
 
 import (
 	"fmt"
+	"iter"
 	"math"
 	"strings"
 	"time"
@@ -265,24 +266,25 @@ type Stack struct {
 }
 
 // Frames is an iterator over the frames in a Stack.
-func (s Stack) Frames(yield func(f StackFrame) bool) bool {
-	if s.id == 0 {
-		return true
-	}
-	stk := s.table.stacks.mustGet(s.id)
-	for _, pc := range stk.pcs {
-		f := s.table.pcs[pc]
-		sf := StackFrame{
-			PC:   f.pc,
-			Func: s.table.strings.mustGet(f.funcID),
-			File: s.table.strings.mustGet(f.fileID),
-			Line: f.line,
+func (s Stack) Frames() iter.Seq[StackFrame] {
+	return func(yield func(StackFrame) bool) {
+		if s.id == 0 {
+			return
 		}
-		if !yield(sf) {
-			return false
+		stk := s.table.stacks.mustGet(s.id)
+		for _, pc := range stk.pcs {
+			f := s.table.pcs[pc]
+			sf := StackFrame{
+				PC:   f.pc,
+				Func: s.table.strings.mustGet(f.funcID),
+				File: s.table.strings.mustGet(f.fileID),
+				Line: f.line,
+			}
+			if !yield(sf) {
+				return
+			}
 		}
 	}
-	return true
 }
 
 // NoStack is a sentinel value that can be compared against any Stack value, indicating
@@ -306,7 +308,7 @@ type StackFrame struct {
 	Line uint64
 }
 
-// ExperimentalEvent presents a raw view of an experimental event's arguments and thier names.
+// ExperimentalEvent presents a raw view of an experimental event's arguments and their names.
 type ExperimentalEvent struct {
 	// Name is the name of the event.
 	Name string
@@ -647,8 +649,9 @@ func (e Event) StateTransition() StateTransition {
 		s = goStateTransition(e.ctx.G, GoSyscall, GoRunnable)
 		s.Stack = e.Stack() // This event references the resource the event happened on.
 	case go122.EvGoStatus, go122.EvGoStatusStack:
-		// N.B. ordering.advance populates e.base.extra.
-		s = goStateTransition(GoID(e.base.args[0]), GoState(e.base.extra(version.Go122)[0]), go122GoStatus2GoState[e.base.args[2]])
+		packedStatus := e.base.args[2]
+		from, to := packedStatus>>32, packedStatus&((1<<32)-1)
+		s = goStateTransition(GoID(e.base.args[0]), GoState(from), go122GoStatus2GoState[to])
 	default:
 		panic(fmt.Sprintf("internal error: unexpected event type for StateTransition kind: %s", go122.EventString(e.base.typ)))
 	}
@@ -795,11 +798,10 @@ func (e Event) String() string {
 		if s.Stack != NoStack {
 			fmt.Fprintln(&sb)
 			fmt.Fprintln(&sb, "TransitionStack=")
-			s.Stack.Frames(func(f StackFrame) bool {
+			for f := range s.Stack.Frames() {
 				fmt.Fprintf(&sb, "\t%s @ 0x%x\n", f.Func, f.PC)
 				fmt.Fprintf(&sb, "\t\t%s:%d\n", f.File, f.Line)
-				return true
-			})
+			}
 		}
 	case EventExperimental:
 		r := e.Experimental()
@@ -808,11 +810,10 @@ func (e Event) String() string {
 	if stk := e.Stack(); stk != NoStack {
 		fmt.Fprintln(&sb)
 		fmt.Fprintln(&sb, "Stack=")
-		stk.Frames(func(f StackFrame) bool {
+		for f := range stk.Frames() {
 			fmt.Fprintf(&sb, "\t%s @ 0x%x\n", f.Func, f.PC)
 			fmt.Fprintf(&sb, "\t\t%s:%d\n", f.File, f.Line)
-			return true
-		})
+		}
 	}
 	return sb.String()
 }
diff --git a/src/internal/trace/event/event.go b/src/internal/trace/event/event.go
index adcb8811..b8b6af00 100644
--- a/src/internal/trace/event/event.go
+++ b/src/internal/trace/event/event.go
@@ -4,7 +4,9 @@
 
 package event
 
-// Type is the common in-memory representation of the low-leve
+// Type indicates an event's type from which its arguments and semantics can be
+// derived. Its representation matches the wire format's representation of the event
+// types that precede all event data.
 type Type uint8
 
 // Spec is a specification for a trace event. It contains sufficient information
@@ -18,7 +20,7 @@ type Spec struct {
 	//
 	// Argument names follow a certain structure and this structure
 	// is relied on by the testing framework to type-check arguments.
-	// The structure is is:
+	// The structure is:
 	//
 	//     (?P[A-Za-z]+_)?(?P[A-Za-z]+)
 	//
diff --git a/src/internal/trace/generation.go b/src/internal/trace/generation.go
index 098d1d4f..98bbf439 100644
--- a/src/internal/trace/generation.go
+++ b/src/internal/trace/generation.go
@@ -25,6 +25,7 @@ import (
 type generation struct {
 	gen        uint64
 	batches    map[ThreadID][]batch
+	batchMs    []ThreadID
 	cpuSamples []cpuSample
 	*evTable
 }
@@ -169,6 +170,9 @@ func processBatch(g *generation, b batch) error {
 			return err
 		}
 	default:
+		if _, ok := g.batches[b.m]; !ok {
+			g.batchMs = append(g.batchMs, b.m)
+		}
 		g.batches[b.m] = append(g.batches[b.m], b)
 	}
 	return nil
diff --git a/src/internal/trace/internal/oldtrace/parser.go b/src/internal/trace/internal/oldtrace/parser.go
index afbf0ed5..0365eeff 100644
--- a/src/internal/trace/internal/oldtrace/parser.go
+++ b/src/internal/trace/internal/oldtrace/parser.go
@@ -385,10 +385,10 @@ func (p *parser) parseEventBatches() (Events, error) {
 	// Merge events as long as at least one P has more events
 	gs := make(map[uint64]gState)
 	// Note: technically we don't need a priority queue here. We're only ever
-	// interested in the earliest elligible event, which means we just have to
+	// interested in the earliest eligible event, which means we just have to
 	// track the smallest element. However, in practice, the priority queue
 	// performs better, because for each event we only have to compute its state
-	// transition once, not on each iteration. If it was elligible before, it'll
+	// transition once, not on each iteration. If it was eligible before, it'll
 	// already be in the queue. Furthermore, on average, we only have one P to
 	// look at in each iteration, because all other Ps are already in the queue.
 	var frontier orderEventList
@@ -813,7 +813,7 @@ func (p *parser) readRawEvent(flags uint, ev *rawEvent) error {
 	}
 }
 
-// loadBatch loads the next batch for pid and appends its contents to to events.
+// loadBatch loads the next batch for pid and appends its contents to events.
 func (p *parser) loadBatch(pid int32, events []Event) ([]Event, error) {
 	offsets := p.batchOffsets[pid]
 	if len(offsets) == 0 {
diff --git a/src/internal/trace/order.go b/src/internal/trace/order.go
index 4b3b8029..d0818a50 100644
--- a/src/internal/trace/order.go
+++ b/src/internal/trace/order.go
@@ -377,7 +377,7 @@ func (o *ordering) advanceGoStatus(ev *baseEvent, evt *evTable, m ThreadID, gen
 	} else {
 		return curCtx, false, fmt.Errorf("found goroutine status for new goroutine after the first generation: id=%v status=%v", gid, status)
 	}
-	ev.extra(version.Go122)[0] = uint64(oldState) // Smuggle in the old state for StateTransition.
+	ev.args[2] = uint64(oldState)<<32 | uint64(status) // Smuggle in the old state for StateTransition.
 
 	newCtx := curCtx
 	switch status {
diff --git a/src/internal/trace/raw/event.go b/src/internal/trace/raw/event.go
index 4766fbe5..e163a2c6 100644
--- a/src/internal/trace/raw/event.go
+++ b/src/internal/trace/raw/event.go
@@ -5,6 +5,7 @@
 package raw
 
 import (
+	"encoding/binary"
 	"strconv"
 	"strings"
 
@@ -58,3 +59,18 @@ func (e *Event) String() string {
 	}
 	return s.String()
 }
+
+// EncodedSize returns the canonical encoded size of an event.
+func (e *Event) EncodedSize() int {
+	size := 1
+	var buf [binary.MaxVarintLen64]byte
+	for _, arg := range e.Args {
+		size += binary.PutUvarint(buf[:], arg)
+	}
+	spec := e.Version.Specs()[e.Ev]
+	if spec.HasData {
+		size += binary.PutUvarint(buf[:], uint64(len(e.Data)))
+		size += len(e.Data)
+	}
+	return size
+}
diff --git a/src/internal/trace/reader.go b/src/internal/trace/reader.go
index c05d5b58..81157292 100644
--- a/src/internal/trace/reader.go
+++ b/src/internal/trace/reader.go
@@ -142,7 +142,8 @@ func (r *Reader) ReadEvent() (e Event, err error) {
 		r.cpuSamples = r.gen.cpuSamples
 
 		// Reset frontier.
-		for m, batches := range r.gen.batches {
+		for _, m := range r.gen.batchMs {
+			batches := r.gen.batches[m]
 			bc := &batchCursor{m: m}
 			ok, err := bc.nextEvent(batches, r.gen.freq)
 			if err != nil {
diff --git a/src/internal/trace/summary.go b/src/internal/trace/summary.go
index fa3e3359..f31439fe 100644
--- a/src/internal/trace/summary.go
+++ b/src/internal/trace/summary.go
@@ -390,24 +390,14 @@ func (s *Summarizer) Event(ev *Event) {
 			// This root frame will be identical for all transitions on this
 			// goroutine, because it represents its immutable start point.
 			if g.Name == "" {
-				stk := st.Stack
-				if stk != NoStack {
-					var frame StackFrame
-					var ok bool
-					stk.Frames(func(f StackFrame) bool {
-						frame = f
-						ok = true
-						return true
-					})
-					if ok {
-						// NB: this PC won't actually be consistent for
-						// goroutines which existed at the start of the
-						// trace. The UI doesn't use it directly; this
-						// mainly serves as an indication that we
-						// actually saw a call stack for the goroutine
-						g.PC = frame.PC
-						g.Name = frame.Func
-					}
+				for frame := range st.Stack.Frames() {
+					// NB: this PC won't actually be consistent for
+					// goroutines which existed at the start of the
+					// trace. The UI doesn't use it directly; this
+					// mainly serves as an indication that we
+					// actually saw a call stack for the goroutine
+					g.PC = frame.PC
+					g.Name = frame.Func
 				}
 			}
 
diff --git a/src/internal/trace/testdata/cmd/gotraceeventstats/main.go b/src/internal/trace/testdata/cmd/gotraceeventstats/main.go
deleted file mode 100644
index d2379daa..00000000
--- a/src/internal/trace/testdata/cmd/gotraceeventstats/main.go
+++ /dev/null
@@ -1,136 +0,0 @@
-// Copyright 2023 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package main
-
-import (
-	"cmp"
-	"encoding/binary"
-	"flag"
-	"fmt"
-	"io"
-	"log"
-	"os"
-	"slices"
-	"text/tabwriter"
-
-	"internal/trace/event"
-	"internal/trace/raw"
-)
-
-func init() {
-	flag.Usage = func() {
-		fmt.Fprintf(flag.CommandLine.Output(), "Usage: %s [mode]\n", os.Args[0])
-		fmt.Fprintf(flag.CommandLine.Output(), "\n")
-		fmt.Fprintf(flag.CommandLine.Output(), "Accepts a trace at stdin.\n")
-		fmt.Fprintf(flag.CommandLine.Output(), "\n")
-		fmt.Fprintf(flag.CommandLine.Output(), "Supported modes:")
-		fmt.Fprintf(flag.CommandLine.Output(), "\n")
-		fmt.Fprintf(flag.CommandLine.Output(), "* size  - dumps size stats\n")
-		fmt.Fprintf(flag.CommandLine.Output(), "\n")
-		flag.PrintDefaults()
-	}
-	log.SetFlags(0)
-}
-
-func main() {
-	log.SetPrefix("")
-	flag.Parse()
-
-	if flag.NArg() != 1 {
-		log.Print("missing mode argument")
-		flag.Usage()
-		os.Exit(1)
-	}
-	var err error
-	switch mode := flag.Arg(0); mode {
-	case "size":
-		err = printSizeStats(os.Stdin)
-	default:
-		log.Printf("unknown mode %q", mode)
-		flag.Usage()
-		os.Exit(1)
-	}
-	if err != nil {
-		log.Fatalf("error: %v", err)
-		os.Exit(1)
-	}
-}
-
-func printSizeStats(r io.Reader) error {
-	cr := countingReader{Reader: r}
-	tr, err := raw.NewReader(&cr)
-	if err != nil {
-		return err
-	}
-	type eventStats struct {
-		typ   event.Type
-		count int
-		bytes int
-	}
-	var stats [256]eventStats
-	for i := range stats {
-		stats[i].typ = event.Type(i)
-	}
-	eventsRead := 0
-	for {
-		e, err := tr.ReadEvent()
-		if err == io.EOF {
-			break
-		}
-		if err != nil {
-			return err
-		}
-		s := &stats[e.Ev]
-		s.count++
-		s.bytes += encodedSize(&e)
-		eventsRead++
-	}
-	slices.SortFunc(stats[:], func(a, b eventStats) int {
-		return cmp.Compare(b.bytes, a.bytes)
-	})
-	specs := tr.Version().Specs()
-	w := tabwriter.NewWriter(os.Stdout, 3, 8, 2, ' ', 0)
-	fmt.Fprintf(w, "Event\tBytes\t%%\tCount\t%%\n")
-	fmt.Fprintf(w, "-\t-\t-\t-\t-\n")
-	for i := range stats {
-		stat := &stats[i]
-		name := ""
-		if int(stat.typ) >= len(specs) {
-			name = fmt.Sprintf("", stat.typ)
-		} else {
-			name = specs[stat.typ].Name
-		}
-		bytesPct := float64(stat.bytes) / float64(cr.bytesRead) * 100
-		countPct := float64(stat.count) / float64(eventsRead) * 100
-		fmt.Fprintf(w, "%s\t%d\t%.2f%%\t%d\t%.2f%%\n", name, stat.bytes, bytesPct, stat.count, countPct)
-	}
-	w.Flush()
-	return nil
-}
-
-func encodedSize(e *raw.Event) int {
-	size := 1
-	var buf [binary.MaxVarintLen64]byte
-	for _, arg := range e.Args {
-		size += binary.PutUvarint(buf[:], arg)
-	}
-	spec := e.Version.Specs()[e.Ev]
-	if spec.HasData {
-		size += binary.PutUvarint(buf[:], uint64(len(e.Data)))
-		size += len(e.Data)
-	}
-	return size
-}
-
-type countingReader struct {
-	io.Reader
-	bytesRead int
-}
-
-func (r *countingReader) Read(b []byte) (int, error) {
-	n, err := r.Reader.Read(b)
-	r.bytesRead += n
-	return n, err
-}
diff --git a/src/internal/trace/testdata/cmd/gotraceraw/main.go b/src/internal/trace/testdata/cmd/gotraceraw/main.go
deleted file mode 100644
index ec4ebf23..00000000
--- a/src/internal/trace/testdata/cmd/gotraceraw/main.go
+++ /dev/null
@@ -1,86 +0,0 @@
-// Copyright 2023 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package main
-
-import (
-	"flag"
-	"fmt"
-	"io"
-	"log"
-	"os"
-
-	"internal/trace/raw"
-	"internal/trace/version"
-)
-
-func init() {
-	flag.Usage = func() {
-		fmt.Fprintf(flag.CommandLine.Output(), "Usage: %s [mode]\n", os.Args[0])
-		fmt.Fprintf(flag.CommandLine.Output(), "\n")
-		fmt.Fprintf(flag.CommandLine.Output(), "Supported modes:")
-		fmt.Fprintf(flag.CommandLine.Output(), "\n")
-		fmt.Fprintf(flag.CommandLine.Output(), "* text2bytes - converts a text format trace to bytes\n")
-		fmt.Fprintf(flag.CommandLine.Output(), "* bytes2text - converts a byte format trace to text\n")
-		fmt.Fprintf(flag.CommandLine.Output(), "\n")
-		flag.PrintDefaults()
-	}
-	log.SetFlags(0)
-}
-
-func main() {
-	flag.Parse()
-	if narg := flag.NArg(); narg != 1 {
-		log.Fatal("expected exactly one positional argument: the mode to operate in; see -h output")
-	}
-
-	r := os.Stdin
-	w := os.Stdout
-
-	var tr traceReader
-	var tw traceWriter
-	var err error
-
-	switch flag.Arg(0) {
-	case "text2bytes":
-		tr, err = raw.NewTextReader(r)
-		if err != nil {
-			log.Fatal(err)
-		}
-		tw, err = raw.NewWriter(w, tr.Version())
-		if err != nil {
-			log.Fatal(err)
-		}
-	case "bytes2text":
-		tr, err = raw.NewReader(r)
-		if err != nil {
-			log.Fatal(err)
-		}
-		tw, err = raw.NewTextWriter(w, tr.Version())
-		if err != nil {
-			log.Fatal(err)
-		}
-	}
-	for {
-		ev, err := tr.ReadEvent()
-		if err == io.EOF {
-			break
-		}
-		if err != nil {
-			log.Fatal(err)
-		}
-		if err := tw.WriteEvent(ev); err != nil {
-			log.Fatal(err)
-		}
-	}
-}
-
-type traceReader interface {
-	Version() version.Version
-	ReadEvent() (raw.Event, error)
-}
-
-type traceWriter interface {
-	WriteEvent(raw.Event) error
-}
diff --git a/src/internal/trace/testdata/cmd/gotracevalidate/main.go b/src/internal/trace/testdata/cmd/gotracevalidate/main.go
deleted file mode 100644
index 6c681df1..00000000
--- a/src/internal/trace/testdata/cmd/gotracevalidate/main.go
+++ /dev/null
@@ -1,53 +0,0 @@
-// Copyright 2023 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package main
-
-import (
-	"flag"
-	"fmt"
-	"io"
-	"log"
-	"os"
-
-	"internal/trace"
-	"internal/trace/testtrace"
-)
-
-func init() {
-	flag.Usage = func() {
-		fmt.Fprintf(flag.CommandLine.Output(), "Usage: %s\n", os.Args[0])
-		fmt.Fprintf(flag.CommandLine.Output(), "\n")
-		fmt.Fprintf(flag.CommandLine.Output(), "Accepts a trace at stdin and validates it.\n")
-		flag.PrintDefaults()
-	}
-	log.SetFlags(0)
-}
-
-var logEvents = flag.Bool("log-events", false, "whether to log events")
-
-func main() {
-	flag.Parse()
-
-	r, err := trace.NewReader(os.Stdin)
-	if err != nil {
-		log.Fatal(err)
-	}
-	v := testtrace.NewValidator()
-	for {
-		ev, err := r.ReadEvent()
-		if err == io.EOF {
-			break
-		}
-		if err != nil {
-			log.Fatal(err)
-		}
-		if *logEvents {
-			log.Println(ev.String())
-		}
-		if err := v.Event(ev); err != nil {
-			log.Fatal(err)
-		}
-	}
-}
diff --git a/src/internal/trace/testdata/generators/go122-create-syscall-reuse-thread-id.go b/src/internal/trace/testdata/generators/go122-create-syscall-reuse-thread-id.go
index a14d3767..e5081598 100644
--- a/src/internal/trace/testdata/generators/go122-create-syscall-reuse-thread-id.go
+++ b/src/internal/trace/testdata/generators/go122-create-syscall-reuse-thread-id.go
@@ -4,7 +4,7 @@
 
 // Tests a G being created from within a syscall.
 //
-// Specifically, it tests a scenerio wherein a C
+// Specifically, it tests a scenario wherein a C
 // thread is calling into Go, creating a goroutine in
 // a syscall (in the tracer's model). The system is free
 // to reuse thread IDs, so first a thread ID is used to
diff --git a/src/internal/trace/testdata/generators/go122-create-syscall-with-p.go b/src/internal/trace/testdata/generators/go122-create-syscall-with-p.go
index 1eb18026..681464ce 100644
--- a/src/internal/trace/testdata/generators/go122-create-syscall-with-p.go
+++ b/src/internal/trace/testdata/generators/go122-create-syscall-with-p.go
@@ -4,7 +4,7 @@
 
 // Tests a G being created from within a syscall.
 //
-// Specifically, it tests a scenerio wherein a C
+// Specifically, it tests a scenario wherein a C
 // thread is calling into Go, creating a goroutine in
 // a syscall (in the tracer's model). Because the actual
 // m can be reused, it's possible for that m to have never
diff --git a/src/internal/trace/testdata/generators/go122-syscall-steal-proc-ambiguous.go b/src/internal/trace/testdata/generators/go122-syscall-steal-proc-ambiguous.go
index 1f01cc9e..4e729698 100644
--- a/src/internal/trace/testdata/generators/go122-syscall-steal-proc-ambiguous.go
+++ b/src/internal/trace/testdata/generators/go122-syscall-steal-proc-ambiguous.go
@@ -4,7 +4,7 @@
 
 // Tests syscall P stealing.
 //
-// Specifically, it tests a scenerio wherein, without a
+// Specifically, it tests a scenario wherein, without a
 // P sequence number of GoSyscallBegin, the syscall that
 // a ProcSteal applies to is ambiguous. This only happens in
 // practice when the events aren't already properly ordered
diff --git a/src/internal/trace/testtrace/validation.go b/src/internal/trace/testtrace/validation.go
index ec492110..59ff19e6 100644
--- a/src/internal/trace/testtrace/validation.go
+++ b/src/internal/trace/testtrace/validation.go
@@ -350,20 +350,17 @@ func (v *Validator) getOrCreateThread(e *errAccumulator, ev trace.Event, m trace
 
 func checkStack(e *errAccumulator, stk trace.Stack) {
 	// Check for non-empty values, but we also check for crashes due to incorrect validation.
-	i := 0
-	stk.Frames(func(f trace.StackFrame) bool {
+	for i, f := range slices.Collect(stk.Frames()) {
 		if i == 0 {
 			// Allow for one fully zero stack.
 			//
 			// TODO(mknyszek): Investigate why that happens.
-			return true
+			continue
 		}
 		if f.Func == "" || f.File == "" || f.PC == 0 || f.Line == 0 {
 			e.Errorf("invalid stack frame %#v: missing information", f)
 		}
-		i++
-		return true
-	})
+	}
 }
 
 type errAccumulator struct {
diff --git a/src/internal/trace/trace_test.go b/src/internal/trace/trace_test.go
index 7dc5cbb8..facac47e 100644
--- a/src/internal/trace/trace_test.go
+++ b/src/internal/trace/trace_test.go
@@ -16,6 +16,7 @@ import (
 	"os"
 	"path/filepath"
 	"runtime"
+	"slices"
 	"strings"
 	"testing"
 )
@@ -148,12 +149,11 @@ func TestTraceCPUProfile(t *testing.T) {
 				if hogRegion != nil && ev.Goroutine() == hogRegion.Goroutine() {
 					traceSamples++
 					var fns []string
-					ev.Stack().Frames(func(frame trace.StackFrame) bool {
+					for frame := range ev.Stack().Frames() {
 						if frame.Func != "runtime.goexit" {
 							fns = append(fns, fmt.Sprintf("%s:%d", frame.Func, frame.Line))
 						}
-						return true
-					})
+					}
 					stack := strings.Join(fns, "|")
 					traceStacks[stack]++
 				}
@@ -436,21 +436,15 @@ func TestTraceStacks(t *testing.T) {
 			}...)
 		}
 		stackMatches := func(stk trace.Stack, frames []frame) bool {
-			i := 0
-			match := true
-			stk.Frames(func(f trace.StackFrame) bool {
+			for i, f := range slices.Collect(stk.Frames()) {
 				if f.Func != frames[i].fn {
-					match = false
 					return false
 				}
 				if line := uint64(frames[i].line); line != 0 && line != f.Line {
-					match = false
 					return false
 				}
-				i++
-				return true
-			})
-			return match
+			}
+			return true
 		}
 		r, err := trace.NewReader(bytes.NewReader(tb))
 		if err != nil {
@@ -507,7 +501,7 @@ func TestTraceStress(t *testing.T) {
 	case "js", "wasip1":
 		t.Skip("no os.Pipe on " + runtime.GOOS)
 	}
-	testTraceProg(t, "stress.go", nil)
+	testTraceProg(t, "stress.go", checkReaderDeterminism)
 }
 
 func TestTraceStressStartStop(t *testing.T) {
@@ -535,6 +529,43 @@ func TestTraceIterPull(t *testing.T) {
 	testTraceProg(t, "iter-pull.go", nil)
 }
 
+func checkReaderDeterminism(t *testing.T, tb, _ []byte, _ bool) {
+	events := func() []trace.Event {
+		var evs []trace.Event
+
+		r, err := trace.NewReader(bytes.NewReader(tb))
+		if err != nil {
+			t.Error(err)
+		}
+		for {
+			ev, err := r.ReadEvent()
+			if err == io.EOF {
+				break
+			}
+			if err != nil {
+				t.Fatal(err)
+			}
+			evs = append(evs, ev)
+		}
+
+		return evs
+	}
+
+	evs1 := events()
+	evs2 := events()
+
+	if l1, l2 := len(evs1), len(evs2); l1 != l2 {
+		t.Fatalf("re-reading trace gives different event count (%d != %d)", l1, l2)
+	}
+	for i, ev1 := range evs1 {
+		ev2 := evs2[i]
+		if s1, s2 := ev1.String(), ev2.String(); s1 != s2 {
+			t.Errorf("re-reading trace gives different event %d:\n%s\n%s\n", i, s1, s2)
+			break
+		}
+	}
+}
+
 func testTraceProg(t *testing.T, progName string, extra func(t *testing.T, trace, stderr []byte, stress bool)) {
 	testenv.MustHaveGoRun(t)
 
diff --git a/src/internal/trace/traceviewer/emitter.go b/src/internal/trace/traceviewer/emitter.go
index c91c743a..c74f1c2e 100644
--- a/src/internal/trace/traceviewer/emitter.go
+++ b/src/internal/trace/traceviewer/emitter.go
@@ -614,7 +614,7 @@ func (e *Emitter) tsWithinRange(ts time.Duration) bool {
 	return e.rangeStart <= ts && ts <= e.rangeEnd
 }
 
-// OptionalEvent emits ev if it's within the time range of of the consumer, i.e.
+// OptionalEvent emits ev if it's within the time range of the consumer, i.e.
 // the selected trace split range.
 func (e *Emitter) OptionalEvent(ev *format.Event) {
 	e.c.ConsumeViewerEvent(ev, false)
diff --git a/src/internal/types/errors/generrordocs.go b/src/internal/types/errors/generrordocs.go
index 46343be3..613c7742 100644
--- a/src/internal/types/errors/generrordocs.go
+++ b/src/internal/types/errors/generrordocs.go
@@ -1,9 +1,9 @@
-//go:build ignore
-
 // Copyright 2023 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build ignore
+
 // generrordocs creates a Markdown file for each (compiler) error code
 // and its associated documentation.
 // Note: this program must be run in this directory.
diff --git a/src/internal/types/testdata/check/builtins0.go b/src/internal/types/testdata/check/builtins0.go
index 1c0e6920..62759d1e 100644
--- a/src/internal/types/testdata/check/builtins0.go
+++ b/src/internal/types/testdata/check/builtins0.go
@@ -515,7 +515,7 @@ func max1() {
 	_ = max(s)
 	_ = max(x, x)
 	_ = max(x, x, x, x, x)
-	var _ int = max /* ERROR "cannot use max(m) (value of type myint) as int value" */ (m)
+	var _ int = max /* ERROR "cannot use max(m) (value of int type myint) as int value" */ (m)
 	_ = max(x, m /* ERROR "invalid argument: mismatched types int (previous argument) and myint (type of m)" */ , x)
 
 	_ = max(1, x)
@@ -569,7 +569,7 @@ func min1() {
 	_ = min(s)
 	_ = min(x, x)
 	_ = min(x, x, x, x, x)
-	var _ int = min /* ERROR "cannot use min(m) (value of type myint) as int value" */ (m)
+	var _ int = min /* ERROR "cannot use min(m) (value of int type myint) as int value" */ (m)
 	_ = min(x, m /* ERROR "invalid argument: mismatched types int (previous argument) and myint (type of m)" */ , x)
 
 	_ = min(1, x)
diff --git a/src/internal/types/testdata/check/decls2/decls2a.go b/src/internal/types/testdata/check/decls2/decls2a.go
index 2362bb96..58fdbfe1 100644
--- a/src/internal/types/testdata/check/decls2/decls2a.go
+++ b/src/internal/types/testdata/check/decls2/decls2a.go
@@ -83,7 +83,7 @@ func (T5 /* ERROR "invalid receiver" */ ) m2() {}
 // Methods associated with a named pointer type.
 type ptr *int
 func (ptr /* ERROR "invalid receiver" */ ) _() {}
-func (* /* ERROR "invalid receiver" */ ptr) _() {}
+func (*ptr /* ERROR "invalid receiver" */ ) _() {}
 
 // Methods with zero or multiple receivers.
 func ( /* ERROR "method has no receiver" */ ) _() {}
@@ -96,13 +96,13 @@ func (a, b, c /* ERROR "method has multiple receivers" */ T3) _() {}
 func (int /* ERROR "cannot define new methods on non-local type int" */ ) m() {}
 func ([ /* ERROR "invalid receiver" */ ]int) m() {}
 func (time /* ERROR "cannot define new methods on non-local type time.Time" */ .Time) m() {}
-func (* /* ERROR "cannot define new methods on non-local type time.Time" */ time.Time) m() {}
-func (x /* ERROR "invalid receiver" */ interface{}) m() {}
+func (*time /* ERROR "cannot define new methods on non-local type time.Time" */ .Time) m() {}
+func (x any /* ERROR "invalid receiver" */ ) m() {}
 
 // Unsafe.Pointer is treated like a pointer when used as receiver type.
 type UP unsafe.Pointer
 func (UP /* ERROR "invalid" */ ) m1() {}
-func (* /* ERROR "invalid" */ UP) m2() {}
+func (*UP /* ERROR "invalid" */ ) m2() {}
 
 // Double declarations across package files
 const c_double = 0
diff --git a/src/internal/types/testdata/check/errors.go b/src/internal/types/testdata/check/errors.go
index 10b6a22e..615cf862 100644
--- a/src/internal/types/testdata/check/errors.go
+++ b/src/internal/types/testdata/check/errors.go
@@ -58,7 +58,7 @@ func _() {
 
 // Use unqualified names for package-local objects.
 type T struct{}
-var _ int = T /* ERROR "value of type T" */ {} // use T in error message rather than errors.T
+var _ int = T /* ERROR "value of struct type T" */ {} // use T in error message rather than errors.T
 
 // Don't report errors containing "invalid type" (issue #24182).
 func _(x *missing /* ERROR "undefined: missing" */ ) {
diff --git a/src/internal/types/testdata/check/go1_20_19.go b/src/internal/types/testdata/check/go1_20_19.go
index e040d396..892179c7 100644
--- a/src/internal/types/testdata/check/go1_20_19.go
+++ b/src/internal/types/testdata/check/go1_20_19.go
@@ -14,4 +14,4 @@ type Slice []byte
 type Array [8]byte
 
 var s Slice
-var p = (Array)(s /* ok because file versions below go1.21 set the langage version to go1.21 */)
+var p = (Array)(s /* ok because file versions below go1.21 set the language version to go1.21 */)
diff --git a/src/internal/types/testdata/check/go1_21_19.go b/src/internal/types/testdata/check/go1_21_19.go
index 5866033e..febf653c 100644
--- a/src/internal/types/testdata/check/go1_21_19.go
+++ b/src/internal/types/testdata/check/go1_21_19.go
@@ -14,4 +14,4 @@ type Slice []byte
 type Array [8]byte
 
 var s Slice
-var p = (Array)(s /* ok because file versions below go1.21 set the langage version to go1.21 */)
+var p = (Array)(s /* ok because file versions below go1.21 set the language version to go1.21 */)
diff --git a/src/internal/types/testdata/check/issues0.go b/src/internal/types/testdata/check/issues0.go
index 3bf4a314..44a709d6 100644
--- a/src/internal/types/testdata/check/issues0.go
+++ b/src/internal/types/testdata/check/issues0.go
@@ -327,7 +327,7 @@ func issue28281c(a, b, c ... /* ERROR "can only use ... with final parameter" */
 func issue28281d(... /* ERROR "can only use ... with final parameter" */ int, int)
 func issue28281e(a, b, c  ... /* ERROR "can only use ... with final parameter" */ int, d int)
 func issue28281f(... /* ERROR "can only use ... with final parameter" */ int, ... /* ERROR "can only use ... with final parameter" */ int, int)
-func (... /* ERROR "can only use ... with final parameter" */ TT) f()
+func (... /* ERROR "invalid use of '...'" */ TT) f()
 func issue28281g() (... /* ERROR "can only use ... with final parameter" */ TT)
 
 // Issue #26234: Make various field/method lookup errors easier to read by matching cmd/compile's output
@@ -363,7 +363,7 @@ func issue35895() {
 
 	// Because both t1 and t2 have the same global package name (template),
 	// qualify packages with full path name in this case.
-	var _ t1.Template = t2 /* ERRORx `cannot use .* \(value of type .html/template.\.Template\) as .text/template.\.Template` */ .Template{}
+	var _ t1.Template = t2 /* ERRORx `cannot use .* \(value of struct type .html/template.\.Template\) as .text/template.\.Template` */ .Template{}
 }
 
 func issue42989(s uint) {
diff --git a/src/internal/types/testdata/check/typeparams.go b/src/internal/types/testdata/check/typeparams.go
index b002377d..5fd82a5a 100644
--- a/src/internal/types/testdata/check/typeparams.go
+++ b/src/internal/types/testdata/check/typeparams.go
@@ -58,10 +58,10 @@ func min[T interface{ ~int }](x, y T) T {
 }
 
 func _[T interface{~int | ~float32}](x, y T) bool { return x < y }
-func _[T any](x, y T) bool { return x /* ERROR "type parameter T is not comparable" */ < y }
-func _[T interface{~int | ~float32 | ~bool}](x, y T) bool { return x /* ERROR "type parameter T is not comparable" */ < y }
+func _[T any](x, y T) bool { return x /* ERROR "type parameter T cannot use operator <" */ < y }
+func _[T interface{~int | ~float32 | ~bool}](x, y T) bool { return x /* ERROR "type parameter T cannot use operator <" */ < y }
 
-func _[T C1[T]](x, y T) bool { return x /* ERROR "type parameter T is not comparable" */ < y }
+func _[T C1[T]](x, y T) bool { return x /* ERROR "type parameter T cannot use operator <" */ < y }
 func _[T C2[T]](x, y T) bool { return x < y }
 
 type C1[T any] interface{}
diff --git a/src/internal/types/testdata/fixedbugs/issue47818.go b/src/internal/types/testdata/fixedbugs/issue47818.go
index 21c85392..4750a4fd 100644
--- a/src/internal/types/testdata/fixedbugs/issue47818.go
+++ b/src/internal/types/testdata/fixedbugs/issue47818.go
@@ -25,7 +25,7 @@ func f[P /* ERROR "type parameter requires go1.18 or later" */ any /* ERROR "pre
 	_ = T[ /* ERROR "type instantiation requires go1.18 or later" */ int](struct{}{})
 }
 
-func (T[ /* ERROR "type instantiation requires go1.18 or later" */ P]) g(x int) {
+func (T /* ERROR "type instantiation requires go1.18 or later" */ [P]) g(x int) {
 	f[ /* ERROR "function instantiation requires go1.18 or later" */ int](0)     // explicit instantiation
 	(f[ /* ERROR "function instantiation requires go1.18 or later" */ int])(0)   // parentheses (different code path)
 	f( /* ERROR "implicit function instantiation requires go1.18 or later" */ x) // implicit instantiation
diff --git a/src/internal/types/testdata/fixedbugs/issue47968.go b/src/internal/types/testdata/fixedbugs/issue47968.go
index 83a17861..e260c63a 100644
--- a/src/internal/types/testdata/fixedbugs/issue47968.go
+++ b/src/internal/types/testdata/fixedbugs/issue47968.go
@@ -1,3 +1,5 @@
+// -gotypesalias=1
+
 // Copyright 2021 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
@@ -10,12 +12,12 @@ func (T[P]) m1()
 
 type A1 = T // ERROR "cannot use generic type"
 
-func (A1[P]) m2() {}
+func (A1[P]) m2() {} // don't report a follow-on error on A1
 
 type A2 = T[int]
 
-func (A2 /* ERRORx `cannot define new methods on instantiated type (T\[int\]|A2)` */) m3()   {}
-func (_ /* ERRORx `cannot define new methods on instantiated type (T\[int\]|A2)` */ A2) m4() {}
+func (A2 /* ERROR "cannot define new methods on instantiated type T[int]" */) m3()   {}
+func (_ A2 /* ERROR "cannot define new methods on instantiated type T[int]" */) m4() {}
 
-func (T[int]) m5()                                     {} // int is the type parameter name, not an instantiation
+func (T[int]) m5()                                       {} // int is the type parameter name, not an instantiation
 func (T[* /* ERROR "must be an identifier" */ int]) m6() {} // syntax error
diff --git a/src/internal/types/testdata/fixedbugs/issue48712.go b/src/internal/types/testdata/fixedbugs/issue48712.go
index 76ad16cd..028660fb 100644
--- a/src/internal/types/testdata/fixedbugs/issue48712.go
+++ b/src/internal/types/testdata/fixedbugs/issue48712.go
@@ -10,7 +10,7 @@ func _[P comparable](x, y P) {
 	_ = y == x
 	_ = y == y
 
-	_ = x /* ERROR "type parameter P is not comparable with <" */ < y
+	_ = x /* ERROR "type parameter P cannot use operator <" */ < y
 }
 
 func _[P comparable](x P, y any) {
@@ -19,7 +19,7 @@ func _[P comparable](x P, y any) {
 	_ = y == x
 	_ = y == y
 
-	_ = x /* ERROR "type parameter P is not comparable with <" */ < y
+	_ = x /* ERROR "type parameter P cannot use operator <" */ < y
 }
 
 func _[P any](x, y P) {
@@ -28,7 +28,7 @@ func _[P any](x, y P) {
 	_ = y /* ERROR "incomparable types in type set" */ == x
 	_ = y /* ERROR "incomparable types in type set" */ == y
 
-	_ = x /* ERROR "type parameter P is not comparable with <" */ < y
+	_ = x /* ERROR "type parameter P cannot use operator <" */ < y
 }
 
 func _[P any](x P, y any) {
@@ -37,5 +37,5 @@ func _[P any](x P, y any) {
 	_ = y == x // ERROR "incomparable types in type set"
 	_ = y == y
 
-	_ = x /* ERROR "type parameter P is not comparable with <" */ < y
+	_ = x /* ERROR "type parameter P cannot use operator <" */ < y
 }
diff --git a/src/internal/types/testdata/fixedbugs/issue49005.go b/src/internal/types/testdata/fixedbugs/issue49005.go
index d91c2078..6ec926ec 100644
--- a/src/internal/types/testdata/fixedbugs/issue49005.go
+++ b/src/internal/types/testdata/fixedbugs/issue49005.go
@@ -26,6 +26,6 @@ type X2 struct{}
 
 func _() {
 	switch F2().(type) {
-	case * /* ERROR "impossible type switch case: *X2\n\tF2() (value of type T2) cannot have dynamic type *X2 (missing method M)" */ X2:
+	case * /* ERROR "impossible type switch case: *X2\n\tF2() (value of interface type T2) cannot have dynamic type *X2 (missing method M)" */ X2:
 	}
 }
diff --git a/src/internal/types/testdata/fixedbugs/issue51339.go b/src/internal/types/testdata/fixedbugs/issue51339.go
index fd10daa2..933e4267 100644
--- a/src/internal/types/testdata/fixedbugs/issue51339.go
+++ b/src/internal/types/testdata/fixedbugs/issue51339.go
@@ -11,10 +11,10 @@ type T[P any, B *P] struct{}
 
 func (T /* ERROR "cannot use generic type" */) m0() {}
 
-// TODO(rfindley): eliminate the duplicate errors here.
-func ( /* ERROR "got 1 type parameter, but receiver base type declares 2" */ T /* ERROR "not enough type arguments for type" */ [_]) m1() {
+func (T /* ERROR "receiver declares 1 type parameter, but receiver base type declares 2" */ [_]) m1() {
 }
 func (T[_, _]) m2() {}
 
 // TODO(gri) this error is unfortunate (issue #51343)
-func (T /* ERROR "too many type arguments for type" */ [_, _, _]) m3() {}
+func (T /* ERROR "receiver declares 3 type parameters, but receiver base type declares 2" */ [_, _, _]) m3() {
+}
diff --git a/src/internal/types/testdata/fixedbugs/issue51360.go b/src/internal/types/testdata/fixedbugs/issue51360.go
index 1b9c45a9..1798a4ab 100644
--- a/src/internal/types/testdata/fixedbugs/issue51360.go
+++ b/src/internal/types/testdata/fixedbugs/issue51360.go
@@ -5,9 +5,9 @@
 package p
 
 func _() {
-	len.Println /* ERROR "cannot select on len" */
-	len.Println /* ERROR "cannot select on len" */ ()
-	_ = len.Println /* ERROR "cannot select on len" */
+	len.Println /* ERROR "invalid use of len (built-in) in selector expression" */
+	len.Println /* ERROR "invalid use of len (built-in) in selector expression" */ ()
+	_ = len.Println /* ERROR "invalid use of len (built-in) in selector expression" */
 	_ = len /* ERROR "cannot index len" */ [0]
 	_ = *len /* ERROR "cannot indirect len" */
 }
diff --git a/src/internal/types/testdata/fixedbugs/issue51503.go b/src/internal/types/testdata/fixedbugs/issue51503.go
new file mode 100644
index 00000000..90a42562
--- /dev/null
+++ b/src/internal/types/testdata/fixedbugs/issue51503.go
@@ -0,0 +1,31 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package p
+
+type T[T any] struct{}
+
+// The inner T in T[T] must not conflict with the receiver base type T.
+func (T[T]) m1() {}
+
+// The receiver parameter r is declared after the receiver type parameter
+// r in T[r]. An error is expected for the receiver parameter.
+func (r /* ERROR "r redeclared" */ T[r]) m2() {}
+
+type C any
+
+// The scope of type parameter C starts after the type name (_)
+// because we want to be able to use type parameters in the type
+// parameter list. Hence, the 2nd C in the type parameter list below
+// refers to the first C. Since constraints cannot be type parameters
+// this is an error.
+type _[C C /* ERROR "cannot use a type parameter as constraint" */] struct{}
+
+// Same issue here.
+func _[C C /* ERROR "cannot use a type parameter as constraint" */]() {}
+
+// The scope of ordinary parameter C starts after the function signature.
+// Therefore, the 2nd C in the parameter list below refers to the type C.
+// This code is correct.
+func _(C C) {} // okay
diff --git a/src/internal/types/testdata/fixedbugs/issue53535.go b/src/internal/types/testdata/fixedbugs/issue53535.go
new file mode 100644
index 00000000..127b8a8b
--- /dev/null
+++ b/src/internal/types/testdata/fixedbugs/issue53535.go
@@ -0,0 +1,35 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package p
+
+import "io"
+
+// test using struct with invalid embedded field
+var _ io.Writer = W{} // no error expected here because W has invalid embedded field
+
+type W struct {
+	*bufio /* ERROR "undefined: bufio" */ .Writer
+}
+
+// test using an invalid type
+var _ interface{ m() } = &M{} // no error expected here because M is invalid
+
+type M undefined // ERROR "undefined: undefined"
+
+// test using struct with invalid embedded field and containing a self-reference (cycle)
+var _ interface{ m() } = &S{} // no error expected here because S is invalid
+
+type S struct {
+	*S
+	undefined // ERROR "undefined: undefined"
+}
+
+// test using a generic struct with invalid embedded field and containing a self-reference (cycle)
+var _ interface{ m() } = &G[int]{} // no error expected here because S is invalid
+
+type G[P any] struct {
+	*G[P]
+	undefined // ERROR "undefined: undefined"
+}
diff --git a/src/internal/types/testdata/fixedbugs/issue60377.go b/src/internal/types/testdata/fixedbugs/issue60377.go
index b754f89d..17a9deb6 100644
--- a/src/internal/types/testdata/fixedbugs/issue60377.go
+++ b/src/internal/types/testdata/fixedbugs/issue60377.go
@@ -57,7 +57,7 @@ func _() {
 	var x S[int]
 	g4(x)      // we can infer int for P
 	g4[int](x) // int is the correct type argument
-	g4[string](x /* ERROR "cannot use x (variable of type S[int]) as S[string] value in argument to g4[string]" */)
+	g4[string](x /* ERROR "cannot use x (variable of struct type S[int]) as S[string] value in argument to g4[string]" */)
 }
 
 // This is similar to the first example but here T1 is a component
diff --git a/src/internal/types/testdata/fixedbugs/issue62157.go b/src/internal/types/testdata/fixedbugs/issue62157.go
index c44f921f..67a110df 100644
--- a/src/internal/types/testdata/fixedbugs/issue62157.go
+++ b/src/internal/types/testdata/fixedbugs/issue62157.go
@@ -90,7 +90,7 @@ func _() {
 	B = f(B, b, a)
 
 	// verify type error
-	A = f /* ERROR "cannot use f(B, b, a) (value of type namedB) as namedA value in assignment" */ (B, b, a)
+	A = f /* ERROR "cannot use f(B, b, a) (value of chan type namedB) as namedA value in assignment" */ (B, b, a)
 }
 
 // Test case 4: some more combinations
diff --git a/src/internal/types/testdata/fixedbugs/issue66751.go b/src/internal/types/testdata/fixedbugs/issue66751.go
new file mode 100644
index 00000000..5a64b4dc
--- /dev/null
+++ b/src/internal/types/testdata/fixedbugs/issue66751.go
@@ -0,0 +1,62 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package p
+
+type S struct{}
+
+func (*S) m(int) {}
+
+func f[A interface {
+	~*B
+	m(C)
+}, B, C any]() {
+}
+
+var _ = f[*S] // must be able to infer all remaining type arguments
+
+// original test case from issue
+
+type ptrTo[A any] interface{ ~*A }
+type hasFoo[A any] interface{ foo(A) }
+type both[A, B any] interface {
+	ptrTo[A]
+	hasFoo[B]
+}
+
+type fooer[A any] struct{}
+
+func (f *fooer[A]) foo(A) {}
+
+func withPtr[A ptrTo[B], B any]()       {}
+func withFoo[A hasFoo[B], B any]()      {}
+func withBoth[A both[B, C], B, C any]() {}
+
+func _() {
+	withPtr[*fooer[int]]()  // ok
+	withFoo[*fooer[int]]()  // ok
+	withBoth[*fooer[int]]() // should be able to infer C
+}
+
+// related test case reported in issue
+
+type X struct{}
+
+func (x X) M() int { return 42 }
+
+func CallM1[T interface{ M() R }, R any](t T) R {
+	return t.M()
+}
+
+func CallM2[T interface {
+	X
+	M() R
+}, R any](t T) R {
+	return t.M()
+}
+
+func _() {
+	CallM1(X{}) // ok
+	CallM2(X{}) // should be able to infer R
+}
diff --git a/src/internal/types/testdata/fixedbugs/issue68184.go b/src/internal/types/testdata/fixedbugs/issue68184.go
new file mode 100644
index 00000000..9c77365a
--- /dev/null
+++ b/src/internal/types/testdata/fixedbugs/issue68184.go
@@ -0,0 +1,38 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package p
+
+type VeryLongStruct struct {
+	A1  int
+	A2  int
+	A3  int
+	A4  int
+	A5  int
+	A6  int
+	A7  int
+	A8  int
+	A9  int
+	A10 int
+	A11 int
+	A12 int
+	A13 int
+	A14 int
+	A15 int
+	A16 int
+	A17 int
+	A18 int
+	A19 int
+	A20 int
+}
+
+func _() {
+	// The error messages in both these cases should print the
+	// struct name rather than the struct's underlying type.
+
+	var x VeryLongStruct
+	x.B2 /* ERROR "x.B2 undefined (type VeryLongStruct has no field or method B2)" */ = false
+
+	_ = []VeryLongStruct{{B2 /* ERROR "unknown field B2 in struct literal of type VeryLongStruct" */ : false}}
+}
diff --git a/src/internal/types/testdata/fixedbugs/issue69576.go b/src/internal/types/testdata/fixedbugs/issue69576.go
new file mode 100644
index 00000000..97e03dfa
--- /dev/null
+++ b/src/internal/types/testdata/fixedbugs/issue69576.go
@@ -0,0 +1,11 @@
+// -goexperiment=aliastypeparams -gotypesalias=1
+
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package p
+
+type A[P int] = struct{}
+
+var _ A[string /* ERROR "string does not satisfy int (string missing in int)" */]
diff --git a/src/internal/types/testdata/fixedbugs/issue69955.go b/src/internal/types/testdata/fixedbugs/issue69955.go
new file mode 100644
index 00000000..68ddf410
--- /dev/null
+++ b/src/internal/types/testdata/fixedbugs/issue69955.go
@@ -0,0 +1,42 @@
+// -gotypesalias=1
+
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package p
+
+import "math/big"
+
+type (
+	S struct{}
+	N int
+
+	A = S
+	B = int
+	C = N
+)
+
+var (
+	i int
+	s S
+	n N
+	a A
+	b B
+	c C
+	w big.Word
+)
+
+const (
+	_ = i // ERROR "i (variable of type int) is not constant"
+	_ = s // ERROR "s (variable of struct type S) is not constant"
+	_ = struct /* ERROR "struct{}{} (value of type struct{}) is not constant" */ {}{}
+	_ = n // ERROR "n (variable of int type N) is not constant"
+
+	_ = a // ERROR "a (variable of struct type A) is not constant"
+	_ = b // ERROR "b (variable of int type B) is not constant"
+	_ = c // ERROR "c (variable of int type C) is not constant"
+	_ = w // ERROR "w (variable of uint type big.Word) is not constant"
+)
+
+var _ int = w /* ERROR "cannot use w + 1 (value of uint type big.Word) as int value in variable declaration" */ + 1
diff --git a/src/internal/types/testdata/fixedbugs/issue70150.go b/src/internal/types/testdata/fixedbugs/issue70150.go
new file mode 100644
index 00000000..5baf4a66
--- /dev/null
+++ b/src/internal/types/testdata/fixedbugs/issue70150.go
@@ -0,0 +1,15 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package p
+
+func _() {
+	var values []int
+	vf(values /* ERROR "(variable of type []int) as string value" */)
+	vf(values...) /* ERROR "have ([]int...)\n\twant (string, ...int)" */
+	vf("ab", "cd", values /* ERROR "have (string, string, []int...)\n\twant (string, ...int)" */ ...)
+}
+
+func vf(method string, values ...int) {
+}
diff --git a/src/internal/types/testdata/fixedbugs/issue70417.go b/src/internal/types/testdata/fixedbugs/issue70417.go
new file mode 100644
index 00000000..74bdea3b
--- /dev/null
+++ b/src/internal/types/testdata/fixedbugs/issue70417.go
@@ -0,0 +1,58 @@
+// -gotypesalias=1
+
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package p
+
+type T[P any] struct{}
+
+// A0
+type A0 = T[int]
+type B0 = *T[int]
+
+func (A0 /* ERROR "cannot define new methods on instantiated type T[int]" */) m()  {}
+func (*A0 /* ERROR "cannot define new methods on instantiated type T[int]" */) m() {}
+func (B0 /* ERROR "cannot define new methods on instantiated type T[int]" */) m()  {}
+
+// A1
+type A1[P any] = T[P]
+type B1[P any] = *T[P]
+
+func (A1 /* ERROR "cannot define new methods on generic alias type A1[P any]" */ [P]) m()  {}
+func (*A1 /* ERROR "cannot define new methods on generic alias type A1[P any]" */ [P]) m() {}
+func (B1 /* ERROR "cannot define new methods on generic alias type B1[P any]" */ [P]) m()  {}
+
+// A2
+type A2[P any] = T[int]
+type B2[P any] = *T[int]
+
+func (A2 /* ERROR "cannot define new methods on generic alias type A2[P any]" */ [P]) m()  {}
+func (*A2 /* ERROR "cannot define new methods on generic alias type A2[P any]" */ [P]) m() {}
+func (B2 /* ERROR "cannot define new methods on generic alias type B2[P any]" */ [P]) m()  {}
+
+// A3
+type A3 = T[int]
+type B3 = *T[int]
+
+func (A3 /* ERROR "cannot define new methods on instantiated type T[int]" */) m()  {}
+func (*A3 /* ERROR "cannot define new methods on instantiated type T[int]" */) m() {}
+func (B3 /* ERROR "cannot define new methods on instantiated type T[int]" */) m()  {}
+
+// A4
+type A4 = T  // ERROR "cannot use generic type T[P any] without instantiation"
+type B4 = *T // ERROR "cannot use generic type T[P any] without instantiation"
+
+func (A4[P]) m1()  {} // don't report a follow-on error on A4
+func (*A4[P]) m2() {} // don't report a follow-on error on A4
+func (B4[P]) m3()  {} // don't report a follow-on error on B4
+
+// instantiation in the middle of an alias chain
+type S struct{}
+type C0 = S
+type C1[P any] = C0
+type C2 = *C1[int]
+
+func (C2 /* ERROR "cannot define new methods on instantiated type C1[int]" */) m()  {}
+func (*C2 /* ERROR "cannot define new methods on instantiated type C1[int]" */) m() {}
diff --git a/src/internal/types/testdata/fixedbugs/issue70526.go b/src/internal/types/testdata/fixedbugs/issue70526.go
new file mode 100644
index 00000000..56b20bfc
--- /dev/null
+++ b/src/internal/types/testdata/fixedbugs/issue70526.go
@@ -0,0 +1,13 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package p
+
+func f(...any)
+
+func _(x int, s []int) {
+	f(0, x /* ERROR "have (number, int...)\n\twant (...any)" */ ...)
+	f(0, s /* ERROR "have (number, []int...)\n\twant (...any)" */ ...)
+	f(0, 0 /* ERROR "have (number, number...)\n\twant (...any)" */ ...)
+}
diff --git a/src/internal/types/testdata/fixedbugs/issue71131.go b/src/internal/types/testdata/fixedbugs/issue71131.go
new file mode 100644
index 00000000..8e7575b0
--- /dev/null
+++ b/src/internal/types/testdata/fixedbugs/issue71131.go
@@ -0,0 +1,15 @@
+// Copyright 2025 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package p
+
+func _() {
+	type Bool bool
+	for range func /* ERROR "yield func returns user-defined boolean, not bool" */ (func() Bool) {} {
+	}
+	for range func /* ERROR "yield func returns user-defined boolean, not bool" */ (func(int) Bool) {} {
+	}
+	for range func /* ERROR "yield func returns user-defined boolean, not bool" */ (func(int, string) Bool) {} {
+	}
+}
diff --git a/src/internal/types/testdata/fixedbugs/issue71198.go b/src/internal/types/testdata/fixedbugs/issue71198.go
new file mode 100644
index 00000000..479f8e2b
--- /dev/null
+++ b/src/internal/types/testdata/fixedbugs/issue71198.go
@@ -0,0 +1,16 @@
+// -gotypesalias=1
+
+// Copyright 2025 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package p
+
+type A[_ any] = any
+
+// This must not panic; also the error message must match the style for non-alias types, below.
+func _[_ A /* ERROR "too many type arguments for type A: have 2, want 1" */ [int, string]]() {}
+
+type T[_ any] any
+
+func _[_ T /* ERROR "too many type arguments for type T: have 2, want 1" */ [int, string]]() {}
diff --git a/src/internal/types/testdata/fixedbugs/issue71284.go b/src/internal/types/testdata/fixedbugs/issue71284.go
new file mode 100644
index 00000000..4b73087a
--- /dev/null
+++ b/src/internal/types/testdata/fixedbugs/issue71284.go
@@ -0,0 +1,10 @@
+// Copyright 2025 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package A
+
+type (
+	_ = A
+	A /* ERROR "invalid recursive type: A refers to itself" */ = A
+)
diff --git a/src/internal/types/testdata/spec/comparisons.go b/src/internal/types/testdata/spec/comparisons.go
index 492890e4..dd92d99b 100644
--- a/src/internal/types/testdata/spec/comparisons.go
+++ b/src/internal/types/testdata/spec/comparisons.go
@@ -108,13 +108,13 @@ func _[
 	_ = c == nil
 
 	_ = b < b
-	_ = a /* ERROR "type parameter A is not comparable with <" */ < a
-	_ = l /* ERROR "type parameter L is not comparable with <" */ < l
-	_ = s /* ERROR "type parameter S is not comparable with <" */ < s
-	_ = p /* ERROR "type parameter P is not comparable with <" */ < p
-	_ = f /* ERROR "type parameter F is not comparable with <" */ < f
-	_ = i /* ERROR "type parameter I is not comparable with <" */ < i
-	_ = j /* ERROR "type parameter J is not comparable with <" */ < j
-	_ = m /* ERROR "type parameter M is not comparable with <" */ < m
-	_ = c /* ERROR "type parameter C is not comparable with <" */ < c
+	_ = a /* ERROR "type parameter A cannot use operator <" */ < a
+	_ = l /* ERROR "type parameter L cannot use operator <" */ < l
+	_ = s /* ERROR "type parameter S cannot use operator <" */ < s
+	_ = p /* ERROR "type parameter P cannot use operator <" */ < p
+	_ = f /* ERROR "type parameter F cannot use operator <" */ < f
+	_ = i /* ERROR "type parameter I cannot use operator <" */ < i
+	_ = j /* ERROR "type parameter J cannot use operator <" */ < j
+	_ = m /* ERROR "type parameter M cannot use operator <" */ < m
+	_ = c /* ERROR "type parameter C cannot use operator <" */ < c
 }
diff --git a/src/internal/types/testdata/spec/range.go b/src/internal/types/testdata/spec/range.go
index 9e32256f..c0f57947 100644
--- a/src/internal/types/testdata/spec/range.go
+++ b/src/internal/types/testdata/spec/range.go
@@ -5,7 +5,7 @@
 package p
 
 type MyInt int32
-type MyBool bool
+type MyBool = bool // TODO(gri) remove alias declaration - see go.dev/issues/71131, go.dev/issues/71164
 type MyString string
 type MyFunc1 func(func(int) bool)
 type MyFunc2 func(int) bool
@@ -102,11 +102,11 @@ func test() {
 	for mi, ms := range f8 {
 		_, _ = mi, ms
 	}
-	for i /* ERROR "cannot use i (value of type MyInt) as int value in assignment" */, s /* ERROR "cannot use s (value of type MyString) as string value in assignment" */ = range f8 {
+	for i /* ERROR "cannot use i (value of int32 type MyInt) as int value in assignment" */, s /* ERROR "cannot use s (value of string type MyString) as string value in assignment" */ = range f8 {
 		_, _ = mi, ms
 	}
 	for mi, ms := range f8 {
-		i, s = mi /* ERROR "cannot use mi (variable of type MyInt) as int value in assignment" */, ms /* ERROR "cannot use ms (variable of type MyString) as string value in assignment" */
+		i, s = mi /* ERROR "cannot use mi (variable of int32 type MyInt) as int value in assignment" */, ms /* ERROR "cannot use ms (variable of string type MyString) as string value in assignment" */
 	}
 	for mi, ms = range f8 {
 		_, _ = mi, ms
diff --git a/src/internal/types/testdata/spec/range_int.go b/src/internal/types/testdata/spec/range_int.go
index 766736cc..db3a78ff 100644
--- a/src/internal/types/testdata/spec/range_int.go
+++ b/src/internal/types/testdata/spec/range_int.go
@@ -44,7 +44,7 @@ func _() {
 	for i, j /* ERROR "range over 10 (untyped int constant) permits only one iteration variable" */ := range 10 {
 		_, _ = i, j
 	}
-	for i = range MyInt /* ERROR "cannot use MyInt(10) (constant 10 of type MyInt) as int value in range clause" */ (10) {
+	for i = range MyInt /* ERROR "cannot use MyInt(10) (constant 10 of int32 type MyInt) as int value in range clause" */ (10) {
 		_ = i
 	}
 	for mi := range MyInt(10) {
diff --git a/src/internal/types/testdata/spec/receivers.go b/src/internal/types/testdata/spec/receivers.go
new file mode 100644
index 00000000..010c5511
--- /dev/null
+++ b/src/internal/types/testdata/spec/receivers.go
@@ -0,0 +1,14 @@
+// -gotypesalias=1
+
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package receivers
+
+// TODO(gri) add more tests checking the various restrictions on receivers
+
+type G[P any] struct{}
+type A[P any] = G[P]
+
+func (a A /* ERROR "cannot define new methods on generic alias type A[P any]" */ [P]) m() {}
diff --git a/src/internal/weak/pointer.go b/src/internal/weak/pointer.go
deleted file mode 100644
index 8e05af2d..00000000
--- a/src/internal/weak/pointer.go
+++ /dev/null
@@ -1,83 +0,0 @@
-// Copyright 2024 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-/*
-The weak package is a package for managing weak pointers.
-
-Weak pointers are pointers that explicitly do not keep a value live and
-must be queried for a regular Go pointer.
-The result of such a query may be observed as nil at any point after a
-weakly-pointed-to object becomes eligible for reclamation by the garbage
-collector.
-More specifically, weak pointers become nil as soon as the garbage collector
-identifies that the object is unreachable, before it is made reachable
-again by a finalizer.
-In terms of the C# language, these semantics are roughly equivalent to the
-the semantics of "short" weak references.
-In terms of the Java language, these semantics are roughly equivalent to the
-semantics of the WeakReference type.
-
-Using go:linkname to access this package and the functions it references
-is explicitly forbidden by the toolchain because the semantics of this
-package have not gone through the proposal process. By exposing this
-functionality, we risk locking in the existing semantics due to Hyrum's Law.
-
-If you believe you have a good use-case for weak references not already
-covered by the standard library, file a proposal issue at
-https://github.com/golang/go/issues instead of relying on this package.
-*/
-package weak
-
-import (
-	"internal/abi"
-	"runtime"
-	"unsafe"
-)
-
-// Pointer is a weak pointer to a value of type T.
-//
-// This value is comparable is guaranteed to compare equal if the pointers
-// that they were created from compare equal. This property is retained even
-// after the object referenced by the pointer used to create a weak reference
-// is reclaimed.
-//
-// If multiple weak pointers are made to different offsets within same object
-// (for example, pointers to different fields of the same struct), those pointers
-// will not compare equal.
-// If a weak pointer is created from an object that becomes reachable again due
-// to a finalizer, that weak pointer will not compare equal with weak pointers
-// created before it became unreachable.
-type Pointer[T any] struct {
-	u unsafe.Pointer
-}
-
-// Make creates a weak pointer from a strong pointer to some value of type T.
-func Make[T any](ptr *T) Pointer[T] {
-	// Explicitly force ptr to escape to the heap.
-	ptr = abi.Escape(ptr)
-
-	var u unsafe.Pointer
-	if ptr != nil {
-		u = runtime_registerWeakPointer(unsafe.Pointer(ptr))
-	}
-	runtime.KeepAlive(ptr)
-	return Pointer[T]{u}
-}
-
-// Strong creates a strong pointer from the weak pointer.
-// Returns nil if the original value for the weak pointer was reclaimed by
-// the garbage collector.
-// If a weak pointer points to an object with a finalizer, then Strong will
-// return nil as soon as the object's finalizer is queued for execution.
-func (p Pointer[T]) Strong() *T {
-	return (*T)(runtime_makeStrongFromWeak(p.u))
-}
-
-// Implemented in runtime.
-
-//go:linkname runtime_registerWeakPointer
-func runtime_registerWeakPointer(unsafe.Pointer) unsafe.Pointer
-
-//go:linkname runtime_makeStrongFromWeak
-func runtime_makeStrongFromWeak(unsafe.Pointer) unsafe.Pointer
diff --git a/src/internal/xcoff/file_test.go b/src/internal/xcoff/file_test.go
index a6722e94..d1f10d6b 100644
--- a/src/internal/xcoff/file_test.go
+++ b/src/internal/xcoff/file_test.go
@@ -6,6 +6,7 @@ package xcoff
 
 import (
 	"reflect"
+	"slices"
 	"testing"
 )
 
@@ -87,7 +88,7 @@ func TestOpen(t *testing.T) {
 		if err != nil {
 			t.Error(err)
 		}
-		if !reflect.DeepEqual(tl, fl) {
+		if !slices.Equal(tl, fl) {
 			t.Errorf("open %s: loader import = %v, want %v", tt.file, tl, fl)
 		}
 	}
diff --git a/src/internal/zstd/zstd.go b/src/internal/zstd/zstd.go
index 0370f601..d4eac399 100644
--- a/src/internal/zstd/zstd.go
+++ b/src/internal/zstd/zstd.go
@@ -358,30 +358,12 @@ func (r *Reader) skipFrame() error {
 		return nil
 	}
 
-	var skip []byte
-	const chunk = 1 << 20 // 1M
-	for size >= chunk {
-		if len(skip) == 0 {
-			skip = make([]byte, chunk)
-		}
-		if _, err := io.ReadFull(r.r, skip); err != nil {
-			return r.wrapNonEOFError(relativeOffset, err)
-		}
-		relativeOffset += chunk
-		size -= chunk
+	n, err := io.CopyN(io.Discard, r.r, int64(size))
+	relativeOffset += int(n)
+	if err != nil {
+		return r.wrapNonEOFError(relativeOffset, err)
 	}
-	if size > 0 {
-		if len(skip) == 0 {
-			skip = make([]byte, size)
-		}
-		if _, err := io.ReadFull(r.r, skip); err != nil {
-			return r.wrapNonEOFError(relativeOffset, err)
-		}
-		relativeOffset += int(size)
-	}
-
 	r.blockOffset += int64(relativeOffset)
-
 	return nil
 }
 
diff --git a/src/io/fs/fs.go b/src/io/fs/fs.go
index 6891d75a..9e19e6a7 100644
--- a/src/io/fs/fs.go
+++ b/src/io/fs/fs.go
@@ -26,6 +26,7 @@ import (
 // correctness.
 type FS interface {
 	// Open opens the named file.
+	// [File.Close] must be called to release any associated resources.
 	//
 	// When Open returns an error, it should be of type *PathError
 	// with the Op field set to "open", the Path field set to name,
@@ -43,7 +44,7 @@ type FS interface {
 // Path names passed to open are UTF-8-encoded,
 // unrooted, slash-separated sequences of path elements, like “x/y/z”.
 // Path names must not contain an element that is “.” or “..” or the empty string,
-// except for the special case that the root directory is named “.”.
+// except for the special case that the name "." may be used for the root directory.
 // Paths must not start or end with a slash: “/x” and “x/” are invalid.
 //
 // Note that paths are slash-separated on all systems, even Windows.
diff --git a/src/io/fs/walk_test.go b/src/io/fs/walk_test.go
index 40f4e1ab..a5fc715e 100644
--- a/src/io/fs/walk_test.go
+++ b/src/io/fs/walk_test.go
@@ -9,7 +9,7 @@ import (
 	"os"
 	pathpkg "path"
 	"path/filepath"
-	"reflect"
+	"slices"
 	"testing"
 	"testing/fstest"
 )
@@ -86,16 +86,7 @@ func mark(entry DirEntry, err error, errors *[]error, clear bool) error {
 }
 
 func TestWalkDir(t *testing.T) {
-	tmpDir := t.TempDir()
-
-	origDir, err := os.Getwd()
-	if err != nil {
-		t.Fatal("finding working dir:", err)
-	}
-	if err = os.Chdir(tmpDir); err != nil {
-		t.Fatal("entering temp dir:", err)
-	}
-	defer os.Chdir(origDir)
+	t.Chdir(t.TempDir())
 
 	fsys := makeTree()
 	errors := make([]error, 0, 10)
@@ -104,7 +95,7 @@ func TestWalkDir(t *testing.T) {
 		return mark(entry, err, &errors, clear)
 	}
 	// Expect no errors.
-	err = WalkDir(fsys, ".", markFn)
+	err := WalkDir(fsys, ".", markFn)
 	if err != nil {
 		t.Fatalf("no error expected, found: %s", err)
 	}
@@ -145,7 +136,7 @@ func TestIssue51617(t *testing.T) {
 		t.Fatal(err)
 	}
 	want := []string{".", "a", "a/bad", "a/next"}
-	if !reflect.DeepEqual(saw, want) {
+	if !slices.Equal(saw, want) {
 		t.Errorf("got directories %v, want %v", saw, want)
 	}
 }
diff --git a/src/io/io_test.go b/src/io/io_test.go
index 9491ffae..38bec824 100644
--- a/src/io/io_test.go
+++ b/src/io/io_test.go
@@ -505,7 +505,7 @@ func TestNopCloserWriterToForwarding(t *testing.T) {
 func TestOffsetWriter_Seek(t *testing.T) {
 	tmpfilename := "TestOffsetWriter_Seek"
 	tmpfile, err := os.CreateTemp(t.TempDir(), tmpfilename)
-	if err != nil || tmpfile == nil {
+	if err != nil {
 		t.Fatalf("CreateTemp(%s) failed: %v", tmpfilename, err)
 	}
 	defer tmpfile.Close()
@@ -564,15 +564,12 @@ func TestOffsetWriter_Seek(t *testing.T) {
 func TestOffsetWriter_WriteAt(t *testing.T) {
 	const content = "0123456789ABCDEF"
 	contentSize := int64(len(content))
-	tmpdir, err := os.MkdirTemp(t.TempDir(), "TestOffsetWriter_WriteAt")
-	if err != nil {
-		t.Fatal(err)
-	}
+	tmpdir := t.TempDir()
 
 	work := func(off, at int64) {
 		position := fmt.Sprintf("off_%d_at_%d", off, at)
 		tmpfile, err := os.CreateTemp(tmpdir, position)
-		if err != nil || tmpfile == nil {
+		if err != nil {
 			t.Fatalf("CreateTemp(%s) failed: %v", position, err)
 		}
 		defer tmpfile.Close()
@@ -642,7 +639,7 @@ func TestOffsetWriter_Write(t *testing.T) {
 	makeOffsetWriter := func(name string) (*OffsetWriter, *os.File) {
 		tmpfilename := "TestOffsetWriter_Write_" + name
 		tmpfile, err := os.CreateTemp(tmpdir, tmpfilename)
-		if err != nil || tmpfile == nil {
+		if err != nil {
 			t.Fatalf("CreateTemp(%s) failed: %v", tmpfilename, err)
 		}
 		return NewOffsetWriter(tmpfile, 0), tmpfile
diff --git a/src/iter/iter.go b/src/iter/iter.go
index 14fd8f81..e765378e 100644
--- a/src/iter/iter.go
+++ b/src/iter/iter.go
@@ -28,7 +28,22 @@ or index-value pairs.
 Yield returns true if the iterator should continue with the next
 element in the sequence, false if it should stop.
 
-Iterator functions are most often called by a range loop, as in:
+For instance, [maps.Keys] returns an iterator that produces the sequence
+of keys of the map m, implemented as follows:
+
+	func Keys[Map ~map[K]V, K comparable, V any](m Map) iter.Seq[K] {
+		return func(yield func(K) bool) {
+			for k := range m {
+				if !yield(k) {
+					return
+				}
+			}
+		}
+	}
+
+Further examples can be found in [The Go Blog: Range Over Function Types].
+
+Iterator functions are most often called by a [range loop], as in:
 
 	func PrintAll[V any](seq iter.Seq[V]) {
 		for v := range seq {
@@ -187,6 +202,9 @@ And then a client could delete boring values from the tree using:
 			p.Delete()
 		}
 	}
+
+[The Go Blog: Range Over Function Types]: https://go.dev/blog/range-functions
+[range loop]: https://go.dev/ref/spec#For_range
 */
 package iter
 
diff --git a/src/iter/pull_test.go b/src/iter/pull_test.go
index 449edee0..e9e3bdad 100644
--- a/src/iter/pull_test.go
+++ b/src/iter/pull_test.go
@@ -193,7 +193,11 @@ func doDoubleNext2() Seq2[int, int] {
 }
 
 func TestPullDoubleYield(t *testing.T) {
-	_, stop := Pull(storeYield())
+	next, stop := Pull(storeYield())
+	next()
+	if yieldSlot == nil {
+		t.Fatal("yield failed")
+	}
 	defer func() {
 		if recover() != nil {
 			yieldSlot = nil
@@ -218,7 +222,11 @@ func storeYield() Seq[int] {
 var yieldSlot func(int) bool
 
 func TestPullDoubleYield2(t *testing.T) {
-	_, stop := Pull2(storeYield2())
+	next, stop := Pull2(storeYield2())
+	next()
+	if yieldSlot2 == nil {
+		t.Fatal("yield failed")
+	}
 	defer func() {
 		if recover() != nil {
 			yieldSlot2 = nil
diff --git a/src/log/slog/attr_test.go b/src/log/slog/attr_test.go
index e01447cf..1f2ce262 100644
--- a/src/log/slog/attr_test.go
+++ b/src/log/slog/attr_test.go
@@ -5,12 +5,16 @@
 package slog
 
 import (
+	"internal/asan"
 	"internal/testenv"
 	"testing"
 	"time"
 )
 
 func TestAttrNoAlloc(t *testing.T) {
+	if asan.Enabled {
+		t.Skip("test allocates with -asan")
+	}
 	testenv.SkipIfOptimizationOff(t)
 	// Assign values just to make sure the compiler doesn't optimize away the statements.
 	var (
diff --git a/src/log/slog/example_discard_test.go b/src/log/slog/example_discard_test.go
new file mode 100644
index 00000000..3e3e37b1
--- /dev/null
+++ b/src/log/slog/example_discard_test.go
@@ -0,0 +1,27 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package slog_test
+
+import (
+	"log/slog"
+	"log/slog/internal/slogtest"
+	"os"
+)
+
+func Example_discardHandler() {
+	// A slog.TextHandler can output log messages.
+	logger1 := slog.New(slog.NewTextHandler(
+		os.Stdout,
+		&slog.HandlerOptions{ReplaceAttr: slogtest.RemoveTime},
+	))
+	logger1.Info("message 1")
+
+	// A slog.DiscardHandler will discard all messages.
+	logger2 := slog.New(slog.DiscardHandler)
+	logger2.Info("message 2")
+
+	// Output:
+	// level=INFO msg="message 1"
+}
diff --git a/src/log/slog/handler.go b/src/log/slog/handler.go
index 2ff85b58..1ca4f9db 100644
--- a/src/log/slog/handler.go
+++ b/src/log/slog/handler.go
@@ -602,3 +602,14 @@ func appendRFC3339Millis(b []byte, t time.Time) []byte {
 	b = append(b[:n+prefixLen], b[n+prefixLen+1:]...) // drop the 4th digit
 	return b
 }
+
+// DiscardHandler discards all log output.
+// DiscardHandler.Enabled returns false for all Levels.
+var DiscardHandler Handler = discardHandler{}
+
+type discardHandler struct{}
+
+func (dh discardHandler) Enabled(context.Context, Level) bool  { return false }
+func (dh discardHandler) Handle(context.Context, Record) error { return nil }
+func (dh discardHandler) WithAttrs(attrs []Attr) Handler       { return dh }
+func (dh discardHandler) WithGroup(name string) Handler        { return dh }
diff --git a/src/log/slog/handler_test.go b/src/log/slog/handler_test.go
index 8ce34526..d34025f1 100644
--- a/src/log/slog/handler_test.go
+++ b/src/log/slog/handler_test.go
@@ -11,6 +11,7 @@ import (
 	"context"
 	"encoding/json"
 	"io"
+	"os"
 	"path/filepath"
 	"slices"
 	"strconv"
@@ -711,3 +712,23 @@ func BenchmarkWriteTime(b *testing.B) {
 		buf = appendRFC3339Millis(buf[:0], tm)
 	}
 }
+
+func TestDiscardHandler(t *testing.T) {
+	ctx := context.Background()
+	stdout, stderr := os.Stdout, os.Stderr
+	os.Stdout, os.Stderr = nil, nil // panic on write
+	t.Cleanup(func() {
+		os.Stdout, os.Stderr = stdout, stderr
+	})
+
+	// Just ensure nothing panics during normal usage
+	l := New(DiscardHandler)
+	l.Info("msg", "a", 1, "b", 2)
+	l.Debug("bg", Int("a", 1), "b", 2)
+	l.Warn("w", Duration("dur", 3*time.Second))
+	l.Error("bad", "a", 1)
+	l.Log(ctx, LevelWarn+1, "w", Int("a", 1), String("b", "two"))
+	l.LogAttrs(ctx, LevelInfo+1, "a b c", Int("a", 1), String("b", "two"))
+	l.Info("info", "a", []Attr{Int("i", 1)})
+	l.Info("info", "a", GroupValue(Int("i", 1)))
+}
diff --git a/src/log/slog/level.go b/src/log/slog/level.go
index 7cddf4cf..2957585e 100644
--- a/src/log/slog/level.go
+++ b/src/log/slog/level.go
@@ -98,10 +98,16 @@ func (l *Level) UnmarshalJSON(data []byte) error {
 	return l.parse(s)
 }
 
-// MarshalText implements [encoding.TextMarshaler]
+// AppendText implements [encoding.TextAppender]
 // by calling [Level.String].
+func (l Level) AppendText(b []byte) ([]byte, error) {
+	return append(b, l.String()...), nil
+}
+
+// MarshalText implements [encoding.TextMarshaler]
+// by calling [Level.AppendText].
 func (l Level) MarshalText() ([]byte, error) {
-	return []byte(l.String()), nil
+	return l.AppendText(nil)
 }
 
 // UnmarshalText implements [encoding.TextUnmarshaler].
@@ -172,10 +178,16 @@ func (v *LevelVar) String() string {
 	return fmt.Sprintf("LevelVar(%s)", v.Level())
 }
 
+// AppendText implements [encoding.TextAppender]
+// by calling [Level.AppendText].
+func (v *LevelVar) AppendText(b []byte) ([]byte, error) {
+	return v.Level().AppendText(b)
+}
+
 // MarshalText implements [encoding.TextMarshaler]
-// by calling [Level.MarshalText].
+// by calling [LevelVar.AppendText].
 func (v *LevelVar) MarshalText() ([]byte, error) {
-	return v.Level().MarshalText()
+	return v.AppendText(nil)
 }
 
 // UnmarshalText implements [encoding.TextUnmarshaler]
diff --git a/src/log/slog/level_test.go b/src/log/slog/level_test.go
index 217a0d72..73be1126 100644
--- a/src/log/slog/level_test.go
+++ b/src/log/slog/level_test.go
@@ -89,6 +89,19 @@ func TestLevelMarshalText(t *testing.T) {
 	}
 }
 
+func TestLevelAppendText(t *testing.T) {
+	buf := make([]byte, 4, 16)
+	want := LevelWarn - 3
+	wantData := []byte("\x00\x00\x00\x00INFO+1")
+	data, err := want.AppendText(buf)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !bytes.Equal(data, wantData) {
+		t.Errorf("got %s, want %s", string(data), string(wantData))
+	}
+}
+
 func TestLevelParse(t *testing.T) {
 	for _, test := range []struct {
 		in   string
@@ -162,6 +175,23 @@ func TestLevelVarMarshalText(t *testing.T) {
 	}
 }
 
+func TestLevelVarAppendText(t *testing.T) {
+	var v LevelVar
+	v.Set(LevelWarn)
+	buf := make([]byte, 4, 16)
+	data, err := v.AppendText(buf)
+	if err != nil {
+		t.Fatal(err)
+	}
+	var v2 LevelVar
+	if err := v2.UnmarshalText(data[4:]); err != nil {
+		t.Fatal(err)
+	}
+	if g, w := v2.Level(), LevelWarn; g != w {
+		t.Errorf("got %s, want %s", g, w)
+	}
+}
+
 func TestLevelVarFlag(t *testing.T) {
 	fs := flag.NewFlagSet("test", flag.ContinueOnError)
 	v := &LevelVar{}
diff --git a/src/log/slog/logger.go b/src/log/slog/logger.go
index 10aa6a2b..961e0cd2 100644
--- a/src/log/slog/logger.go
+++ b/src/log/slog/logger.go
@@ -5,6 +5,7 @@
 package slog
 
 import (
+	"bytes"
 	"context"
 	"log"
 	loginternal "log/internal"
@@ -96,9 +97,7 @@ func (w *handlerWriter) Write(buf []byte) (int, error) {
 
 	// Remove final newline.
 	origLen := len(buf) // Report that the entire buf was written.
-	if len(buf) > 0 && buf[len(buf)-1] == '\n' {
-		buf = buf[:len(buf)-1]
-	}
+	buf = bytes.TrimSuffix(buf, []byte{'\n'})
 	r := NewRecord(time.Now(), level, string(buf), pc)
 	return origLen, w.h.Handle(context.Background(), r)
 }
diff --git a/src/log/slog/logger_test.go b/src/log/slog/logger_test.go
index bb1c8a16..0f1b2113 100644
--- a/src/log/slog/logger_test.go
+++ b/src/log/slog/logger_test.go
@@ -7,6 +7,8 @@ package slog
 import (
 	"bytes"
 	"context"
+	"internal/asan"
+	"internal/msan"
 	"internal/race"
 	"internal/testenv"
 	"io"
@@ -229,7 +231,7 @@ func TestCallDepth(t *testing.T) {
 
 func TestAlloc(t *testing.T) {
 	ctx := context.Background()
-	dl := New(discardHandler{})
+	dl := New(discardTestHandler{})
 	defer SetDefault(Default()) // restore
 	SetDefault(dl)
 
@@ -256,7 +258,7 @@ func TestAlloc(t *testing.T) {
 		})
 	})
 	t.Run("2 pairs disabled inline", func(t *testing.T) {
-		l := New(discardHandler{disabled: true})
+		l := New(DiscardHandler)
 		s := "abc"
 		i := 2000
 		wantAllocs(t, 2, func() {
@@ -267,7 +269,7 @@ func TestAlloc(t *testing.T) {
 		})
 	})
 	t.Run("2 pairs disabled", func(t *testing.T) {
-		l := New(discardHandler{disabled: true})
+		l := New(DiscardHandler)
 		s := "abc"
 		i := 2000
 		wantAllocs(t, 0, func() {
@@ -303,7 +305,7 @@ func TestAlloc(t *testing.T) {
 		})
 	})
 	t.Run("attrs3 disabled", func(t *testing.T) {
-		logger := New(discardHandler{disabled: true})
+		logger := New(DiscardHandler)
 		wantAllocs(t, 0, func() {
 			logger.LogAttrs(ctx, LevelInfo, "hello", Int("a", 1), String("b", "two"), Duration("c", time.Second))
 		})
@@ -566,18 +568,17 @@ func (c *captureHandler) clear() {
 	c.r = Record{}
 }
 
-type discardHandler struct {
-	disabled bool
-	attrs    []Attr
+type discardTestHandler struct {
+	attrs []Attr
 }
 
-func (d discardHandler) Enabled(context.Context, Level) bool { return !d.disabled }
-func (discardHandler) Handle(context.Context, Record) error  { return nil }
-func (d discardHandler) WithAttrs(as []Attr) Handler {
+func (d discardTestHandler) Enabled(context.Context, Level) bool { return true }
+func (discardTestHandler) Handle(context.Context, Record) error  { return nil }
+func (d discardTestHandler) WithAttrs(as []Attr) Handler {
 	d.attrs = concat(d.attrs, as)
 	return d
 }
-func (h discardHandler) WithGroup(name string) Handler {
+func (h discardTestHandler) WithGroup(name string) Handler {
 	return h
 }
 
@@ -644,8 +645,8 @@ func callerPC(depth int) uintptr {
 }
 
 func wantAllocs(t *testing.T, want int, f func()) {
-	if race.Enabled {
-		t.Skip("skipping test in race mode")
+	if race.Enabled || asan.Enabled || msan.Enabled {
+		t.Skip("skipping test in race, asan, and msan modes")
 	}
 	testenv.SkipIfOptimizationOff(t)
 	t.Helper()
diff --git a/src/log/slog/value_test.go b/src/log/slog/value_test.go
index 3e191589..4f405938 100644
--- a/src/log/slog/value_test.go
+++ b/src/log/slog/value_test.go
@@ -6,6 +6,7 @@ package slog
 
 import (
 	"fmt"
+	"internal/asan"
 	"reflect"
 	"strings"
 	"testing"
@@ -86,6 +87,10 @@ func TestValueString(t *testing.T) {
 }
 
 func TestValueNoAlloc(t *testing.T) {
+	if asan.Enabled {
+		t.Skip("test allocates more with -asan; see #70079")
+	}
+
 	// Assign values just to make sure the compiler doesn't optimize away the statements.
 	var (
 		i  int64
diff --git a/src/make.bash b/src/make.bash
index 814b7e87..b67ae152 100755
--- a/src/make.bash
+++ b/src/make.bash
@@ -64,14 +64,14 @@
 # timing information to this file. Useful for profiling where the
 # time goes when these scripts run.
 #
-# GOROOT_BOOTSTRAP: A working Go tree >= Go 1.20.6 for bootstrap.
+# GOROOT_BOOTSTRAP: A working Go tree >= Go 1.22.6 for bootstrap.
 # If $GOROOT_BOOTSTRAP/bin/go is missing, $(go env GOROOT) is
-# tried for all "go" in $PATH. By default, one of $HOME/go1.20.6,
-# $HOME/sdk/go1.20.6, or $HOME/go1.4, whichever exists, in that order.
+# tried for all "go" in $PATH. By default, one of $HOME/go1.22.6,
+# $HOME/sdk/go1.22.6, or $HOME/go1.4, whichever exists, in that order.
 # We still check $HOME/go1.4 to allow for build scripts that still hard-code
 # that name even though they put newer Go toolchains there.
 
-bootgo=1.20.6
+bootgo=1.22.6
 
 set -e
 
@@ -128,13 +128,6 @@ do
 	fi
 done
 
-# Test for debian/kFreeBSD.
-# cmd/dist will detect kFreeBSD as freebsd/$GOARCH, but we need to
-# disable cgo manually.
-if [[ "$(uname -s)" == "GNU/kFreeBSD" ]]; then
-	export CGO_ENABLED=0
-fi
-
 # Clean old generated file that will cause problems in the build.
 rm -f ./runtime/runtime_defs.go
 
diff --git a/src/make.bat b/src/make.bat
index 53122cba..3b5a4663 100644
--- a/src/make.bat
+++ b/src/make.bat
@@ -85,7 +85,7 @@ for /f "tokens=*" %%g in ('where go 2^>nul') do (
 	)
 )
 
-set bootgo=1.20.6
+set bootgo=1.22.6
 if "x%GOROOT_BOOTSTRAP%"=="x" if exist "%HOMEDRIVE%%HOMEPATH%\go%bootgo%" set GOROOT_BOOTSTRAP=%HOMEDRIVE%%HOMEPATH%\go%bootgo%
 if "x%GOROOT_BOOTSTRAP%"=="x" if exist "%HOMEDRIVE%%HOMEPATH%\sdk\go%bootgo%" set GOROOT_BOOTSTRAP=%HOMEDRIVE%%HOMEPATH%\sdk\go%bootgo%
 if "x%GOROOT_BOOTSTRAP%"=="x" set GOROOT_BOOTSTRAP=%HOMEDRIVE%%HOMEPATH%\Go1.4
diff --git a/src/make.rc b/src/make.rc
index 54250011..b3beb756 100755
--- a/src/make.rc
+++ b/src/make.rc
@@ -48,10 +48,10 @@ fn bootstrapenv {
 	GOROOT=$GOROOT_BOOTSTRAP GO111MODULE=off GOENV=off GOOS=() GOARCH=() GOEXPERIMENT=() GOFLAGS=() $*
 }
 
-bootgo = 1.20.6
+bootgo = 1.22.6
 GOROOT = `{cd .. && pwd}
 goroot_bootstrap_set = 'true'
-if(! ~ $#GOROOT_BOOTSTRAP 1){
+if(~ $"GOROOT_BOOTSTRAP ''){
 	goroot_bootstrap_set = 'false'
 	GOROOT_BOOTSTRAP = $home/go1.4
 	for(d in sdk/go$bootgo go$bootgo)
diff --git a/src/maps/example_test.go b/src/maps/example_test.go
index 3d6b7d1b..0795941d 100644
--- a/src/maps/example_test.go
+++ b/src/maps/example_test.go
@@ -7,6 +7,7 @@ package maps_test
 import (
 	"fmt"
 	"maps"
+	"slices"
 	"strings"
 )
 
@@ -133,3 +134,60 @@ func ExampleEqualFunc() {
 	// Output:
 	// true
 }
+
+func ExampleAll() {
+	m1 := map[string]int{
+		"one": 1,
+		"two": 2,
+	}
+	m2 := map[string]int{
+		"one": 10,
+	}
+	maps.Insert(m2, maps.All(m1))
+	fmt.Println("m2 is:", m2)
+	// Output:
+	// m2 is: map[one:1 two:2]
+}
+
+func ExampleKeys() {
+	m1 := map[int]string{
+		1:    "one",
+		10:   "Ten",
+		1000: "THOUSAND",
+	}
+	keys := slices.Sorted(maps.Keys(m1))
+	fmt.Println(keys)
+	// Output:
+	// [1 10 1000]
+}
+
+func ExampleValues() {
+	m1 := map[int]string{
+		1:    "one",
+		10:   "Ten",
+		1000: "THOUSAND",
+	}
+	values := slices.Sorted(maps.Values(m1))
+	fmt.Println(values)
+	// Output:
+	// [THOUSAND Ten one]
+}
+
+func ExampleInsert() {
+	m1 := map[int]string{
+		1000: "THOUSAND",
+	}
+	s1 := []string{"zero", "one", "two", "three"}
+	maps.Insert(m1, slices.All(s1))
+	fmt.Println("m1 is:", m1)
+	// Output:
+	// m1 is: map[0:zero 1:one 2:two 3:three 1000:THOUSAND]
+}
+
+func ExampleCollect() {
+	s1 := []string{"zero", "one", "two", "three"}
+	m1 := maps.Collect(slices.All(s1))
+	fmt.Println("m1 is:", m1)
+	// Output:
+	// m1 is: map[0:zero 1:one 2:two 3:three]
+}
diff --git a/src/maps/maps_test.go b/src/maps/maps_test.go
index fa30fe8c..c8ee3cd0 100644
--- a/src/maps/maps_test.go
+++ b/src/maps/maps_test.go
@@ -48,7 +48,7 @@ func equalNaN[T comparable](v1, v2 T) bool {
 	return v1 == v2 || (isNaN(v1) && isNaN(v2))
 }
 
-// equalStr compares ints and strings.
+// equalIntStr compares ints and strings.
 func equalIntStr(v1 int, v2 string) bool {
 	return strconv.Itoa(v1) == v2
 }
diff --git a/src/math/all_test.go b/src/math/all_test.go
index af3c38c2..c253b7bc 100644
--- a/src/math/all_test.go
+++ b/src/math/all_test.go
@@ -899,8 +899,17 @@ var vfceilSC = []float64{
 	0,
 	Inf(1),
 	NaN(),
+	1<<52 - 1,
+	1<<52 - 0.5, // largest fractional float64
+	1 << 52,
+	-1 << 52,
+	-1<<52 + 0.5, // smallest fractional float64
+	-1<<52 + 1,
+	1 << 53,
+	-1 << 53,
 }
-var ceilSC = []float64{
+
+var ceilBaseSC = []float64{
 	Inf(-1),
 	Copysign(0, -1),
 	0,
@@ -908,6 +917,39 @@ var ceilSC = []float64{
 	NaN(),
 }
 
+var ceilSC = append(ceilBaseSC,
+	1<<52-1,
+	1<<52,
+	1<<52,
+	-1<<52,
+	-1<<52+1,
+	-1<<52+1,
+	1<<53,
+	-1<<53,
+)
+
+var floorSC = append(ceilBaseSC,
+	1<<52-1,
+	1<<52-1,
+	1<<52,
+	-1<<52,
+	-1<<52,
+	-1<<52+1,
+	1<<53,
+	-1<<53,
+)
+
+var truncSC = append(ceilBaseSC,
+	1<<52-1,
+	1<<52-1,
+	1<<52,
+	-1<<52,
+	-1<<52+1,
+	-1<<52+1,
+	1<<53,
+	-1<<53,
+)
+
 var vfcopysignSC = []float64{
 	Inf(-1),
 	Inf(1),
@@ -2489,8 +2531,8 @@ func TestFloor(t *testing.T) {
 		}
 	}
 	for i := 0; i < len(vfceilSC); i++ {
-		if f := Floor(vfceilSC[i]); !alike(ceilSC[i], f) {
-			t.Errorf("Floor(%g) = %g, want %g", vfceilSC[i], f, ceilSC[i])
+		if f := Floor(vfceilSC[i]); !alike(floorSC[i], f) {
+			t.Errorf("Floor(%g) = %g, want %g", vfceilSC[i], f, floorSC[i])
 		}
 	}
 }
@@ -3034,8 +3076,8 @@ func TestTrunc(t *testing.T) {
 		}
 	}
 	for i := 0; i < len(vfceilSC); i++ {
-		if f := Trunc(vfceilSC[i]); !alike(ceilSC[i], f) {
-			t.Errorf("Trunc(%g) = %g, want %g", vfceilSC[i], f, ceilSC[i])
+		if f := Trunc(vfceilSC[i]); !alike(truncSC[i], f) {
+			t.Errorf("Trunc(%g) = %g, want %g", vfceilSC[i], f, truncSC[i])
 		}
 	}
 }
diff --git a/src/math/big/arith_riscv64.s b/src/math/big/arith_riscv64.s
index bad32497..069a4080 100644
--- a/src/math/big/arith_riscv64.s
+++ b/src/math/big/arith_riscv64.s
@@ -10,16 +10,288 @@
 // arithmetic operations on vectors implemented in arith.go.
 
 TEXT ·addVV(SB),NOSPLIT,$0
-	JMP ·addVV_g(SB)
+	MOV	x+24(FP), X5
+	MOV	y+48(FP), X6
+	MOV	z+0(FP), X7
+	MOV	z_len+8(FP), X30
+
+	MOV	$4, X28
+	MOV	$0, X29		// c = 0
+
+	BEQZ	X30, done
+	BLTU	X30, X28, loop1
+
+loop4:
+	MOV	0(X5), X8	// x[0]
+	MOV	0(X6), X9	// y[0]
+	MOV	8(X5), X11	// x[1]
+	MOV	8(X6), X12	// y[1]
+	MOV	16(X5), X14	// x[2]
+	MOV	16(X6), X15	// y[2]
+	MOV	24(X5), X17	// x[3]
+	MOV	24(X6), X18	// y[3]
+
+	ADD	X8, X9, X21	// z[0] = x[0] + y[0]
+	SLTU	X8, X21, X22
+	ADD	X21, X29, X10	// z[0] = x[0] + y[0] + c
+	SLTU	X21, X10, X23
+	ADD	X22, X23, X29	// next c
+
+	ADD	X11, X12, X24	// z[1] = x[1] + y[1]
+	SLTU	X11, X24, X25
+	ADD	X24, X29, X13	// z[1] = x[1] + y[1] + c
+	SLTU	X24, X13, X26
+	ADD	X25, X26, X29	// next c
+
+	ADD	X14, X15, X21	// z[2] = x[2] + y[2]
+	SLTU	X14, X21, X22
+	ADD	X21, X29, X16	// z[2] = x[2] + y[2] + c
+	SLTU	X21, X16, X23
+	ADD	X22, X23, X29	// next c
+
+	ADD	X17, X18, X21	// z[3] = x[3] + y[3]
+	SLTU	X17, X21, X22
+	ADD	X21, X29, X19	// z[3] = x[3] + y[3] + c
+	SLTU	X21, X19, X23
+	ADD	X22, X23, X29	// next c
+
+	MOV	X10, 0(X7)	// z[0]
+	MOV	X13, 8(X7)	// z[1]
+	MOV	X16, 16(X7)	// z[2]
+	MOV	X19, 24(X7)	// z[3]
+
+	ADD	$32, X5
+	ADD	$32, X6
+	ADD	$32, X7
+	SUB	$4, X30
+
+	BGEU	X30, X28, loop4
+	BEQZ	X30, done
+
+loop1:
+	MOV	0(X5), X10	// x
+	MOV	0(X6), X11	// y
+
+	ADD	X10, X11, X12	// z = x + y
+	SLTU	X10, X12, X14
+	ADD	X12, X29, X13	// z = x + y + c
+	SLTU	X12, X13, X15
+	ADD	X14, X15, X29	// next c
+
+	MOV	X13, 0(X7)	// z
+
+	ADD	$8, X5
+	ADD	$8, X6
+	ADD	$8, X7
+	SUB	$1, X30
+
+	BNEZ	X30, loop1
+
+done:
+	MOV	X29, c+72(FP)	// return c
+	RET
 
 TEXT ·subVV(SB),NOSPLIT,$0
-	JMP ·subVV_g(SB)
+	MOV	x+24(FP), X5
+	MOV	y+48(FP), X6
+	MOV	z+0(FP), X7
+	MOV	z_len+8(FP), X30
+
+	MOV	$4, X28
+	MOV	$0, X29		// b = 0
+
+	BEQZ	X30, done
+	BLTU	X30, X28, loop1
+
+loop4:
+	MOV	0(X5), X8	// x[0]
+	MOV	0(X6), X9	// y[0]
+	MOV	8(X5), X11	// x[1]
+	MOV	8(X6), X12	// y[1]
+	MOV	16(X5), X14	// x[2]
+	MOV	16(X6), X15	// y[2]
+	MOV	24(X5), X17	// x[3]
+	MOV	24(X6), X18	// y[3]
+
+	SUB	X9, X8, X21	// z[0] = x[0] - y[0]
+	SLTU	X21, X8, X22
+	SUB	X29, X21, X10	// z[0] = x[0] - y[0] - b
+	SLTU	X10, X21, X23
+	ADD	X22, X23, X29	// next b
+
+	SUB	X12, X11, X24	// z[1] = x[1] - y[1]
+	SLTU	X24, X11, X25
+	SUB	X29, X24, X13	// z[1] = x[1] - y[1] - b
+	SLTU	X13, X24, X26
+	ADD	X25, X26, X29	// next b
+
+	SUB	X15, X14, X21	// z[2] = x[2] - y[2]
+	SLTU	X21, X14, X22
+	SUB	X29, X21, X16	// z[2] = x[2] - y[2] - b
+	SLTU	X16, X21, X23
+	ADD	X22, X23, X29	// next b
+
+	SUB	X18, X17, X21	// z[3] = x[3] - y[3]
+	SLTU	X21, X17, X22
+	SUB	X29, X21, X19	// z[3] = x[3] - y[3] - b
+	SLTU	X19, X21, X23
+	ADD	X22, X23, X29	// next b
+
+	MOV	X10, 0(X7)	// z[0]
+	MOV	X13, 8(X7)	// z[1]
+	MOV	X16, 16(X7)	// z[2]
+	MOV	X19, 24(X7)	// z[3]
+
+	ADD	$32, X5
+	ADD	$32, X6
+	ADD	$32, X7
+	SUB	$4, X30
+
+	BGEU	X30, X28, loop4
+	BEQZ	X30, done
+
+loop1:
+	MOV	0(X5), X10	// x
+	MOV	0(X6), X11	// y
+
+	SUB	X11, X10, X12	// z = x - y
+	SLTU	X12, X10, X14
+	SUB	X29, X12, X13	// z = x - y - b
+	SLTU	X13, X12, X15
+	ADD	X14, X15, X29	// next b
+
+	MOV	X13, 0(X7)	// z
+
+	ADD	$8, X5
+	ADD	$8, X6
+	ADD	$8, X7
+	SUB	$1, X30
+
+	BNEZ	X30, loop1
+
+done:
+	MOV	X29, c+72(FP)	// return b
+	RET
 
 TEXT ·addVW(SB),NOSPLIT,$0
-	JMP ·addVW_g(SB)
+	MOV	x+24(FP), X5
+	MOV	y+48(FP), X6
+	MOV	z+0(FP), X7
+	MOV	z_len+8(FP), X30
+
+	MOV	$4, X28
+	MOV	X6, X29		// c = y
+
+	BEQZ	X30, done
+	BLTU	X30, X28, loop1
+
+loop4:
+	MOV	0(X5), X8	// x[0]
+	MOV	8(X5), X11	// x[1]
+	MOV	16(X5), X14	// x[2]
+	MOV	24(X5), X17	// x[3]
+
+	ADD	X8, X29, X10	// z[0] = x[0] + c
+	SLTU	X8, X10, X29	// next c
+
+	ADD	X11, X29, X13	// z[1] = x[1] + c
+	SLTU	X11, X13, X29	// next c
+
+	ADD	X14, X29, X16	// z[2] = x[2] + c
+	SLTU	X14, X16, X29	// next c
+
+	ADD	X17, X29, X19	// z[3] = x[3] + c
+	SLTU	X17, X19, X29	// next c
+
+	MOV	X10, 0(X7)	// z[0]
+	MOV	X13, 8(X7)	// z[1]
+	MOV	X16, 16(X7)	// z[2]
+	MOV	X19, 24(X7)	// z[3]
+
+	ADD	$32, X5
+	ADD	$32, X7
+	SUB	$4, X30
+
+	BGEU	X30, X28, loop4
+	BEQZ	X30, done
+
+loop1:
+	MOV	0(X5), X10	// x
+
+	ADD	X10, X29, X12	// z = x + c
+	SLTU	X10, X12, X29	// next c
+
+	MOV	X12, 0(X7)	// z
+
+	ADD	$8, X5
+	ADD	$8, X7
+	SUB	$1, X30
+
+	BNEZ	X30, loop1
+
+done:
+	MOV	X29, c+56(FP)	// return c
+	RET
 
 TEXT ·subVW(SB),NOSPLIT,$0
-	JMP ·subVW_g(SB)
+	MOV	x+24(FP), X5
+	MOV	y+48(FP), X6
+	MOV	z+0(FP), X7
+	MOV	z_len+8(FP), X30
+
+	MOV	$4, X28
+	MOV	X6, X29		// b = y
+
+	BEQZ	X30, done
+	BLTU	X30, X28, loop1
+
+loop4:
+	MOV	0(X5), X8	// x[0]
+	MOV	8(X5), X11	// x[1]
+	MOV	16(X5), X14	// x[2]
+	MOV	24(X5), X17	// x[3]
+
+	SUB	X29, X8, X10	// z[0] = x[0] - b
+	SLTU	X10, X8, X29	// next b
+
+	SUB	X29, X11, X13	// z[1] = x[1] - b
+	SLTU	X13, X11, X29	// next b
+
+	SUB	X29, X14, X16	// z[2] = x[2] - b
+	SLTU	X16, X14, X29	// next b
+
+	SUB	X29, X17, X19	// z[3] = x[3] - b
+	SLTU	X19, X17, X29	// next b
+
+	MOV	X10, 0(X7)	// z[0]
+	MOV	X13, 8(X7)	// z[1]
+	MOV	X16, 16(X7)	// z[2]
+	MOV	X19, 24(X7)	// z[3]
+
+	ADD	$32, X5
+	ADD	$32, X7
+	SUB	$4, X30
+
+	BGEU	X30, X28, loop4
+	BEQZ	X30, done
+
+loop1:
+	MOV	0(X5), X10	// x
+
+	SUB	X29, X10, X12	// z = x - b
+	SLTU	X12, X10, X29	// next b
+
+	MOV	X12, 0(X7)	// z
+
+	ADD	$8, X5
+	ADD	$8, X7
+	SUB	$1, X30
+
+	BNEZ	X30, loop1
+
+done:
+	MOV	X29, c+56(FP)	// return b
+	RET
 
 TEXT ·shlVU(SB),NOSPLIT,$0
 	JMP ·shlVU_g(SB)
@@ -28,8 +300,171 @@ TEXT ·shrVU(SB),NOSPLIT,$0
 	JMP ·shrVU_g(SB)
 
 TEXT ·mulAddVWW(SB),NOSPLIT,$0
-	JMP ·mulAddVWW_g(SB)
+	MOV	x+24(FP), X5
+	MOV	y+48(FP), X6
+	MOV	z+0(FP), X7
+	MOV	z_len+8(FP), X30
+	MOV	r+56(FP), X29
+
+	MOV	$4, X28
+
+	BEQ	ZERO, X30, done
+	BLTU	X30, X28, loop1
+
+loop4:
+	MOV	0(X5), X8	// x[0]
+	MOV	8(X5), X11	// x[1]
+	MOV	16(X5), X14	// x[2]
+	MOV	24(X5), X17	// x[3]
+
+	MULHU	X8, X6, X9	// z_hi[0] = x[0] * y
+	MUL	X8, X6, X8	// z_lo[0] = x[0] * y
+	ADD	X8, X29, X10	// z[0] = z_lo[0] + c
+	SLTU	X8, X10, X23
+	ADD	X23, X9, X29	// next c
+
+	MULHU	X11, X6, X12	// z_hi[1] = x[1] * y
+	MUL	X11, X6, X11	// z_lo[1] = x[1] * y
+	ADD	X11, X29, X13	// z[1] = z_lo[1] + c
+	SLTU	X11, X13, X23
+	ADD	X23, X12, X29	// next c
+
+	MULHU	X14, X6, X15	// z_hi[2] = x[2] * y
+	MUL	X14, X6, X14	// z_lo[2] = x[2] * y
+	ADD	X14, X29, X16	// z[2] = z_lo[2] + c
+	SLTU	X14, X16, X23
+	ADD	X23, X15, X29	// next c
+
+	MULHU	X17, X6, X18	// z_hi[3] = x[3] * y
+	MUL	X17, X6, X17	// z_lo[3] = x[3] * y
+	ADD	X17, X29, X19	// z[3] = z_lo[3] + c
+	SLTU	X17, X19, X23
+	ADD	X23, X18, X29	// next c
+
+	MOV	X10, 0(X7)	// z[0]
+	MOV	X13, 8(X7)	// z[1]
+	MOV	X16, 16(X7)	// z[2]
+	MOV	X19, 24(X7)	// z[3]
+
+	ADD	$32, X5
+	ADD	$32, X7
+	SUB	$4, X30
+
+	BGEU	X30, X28, loop4
+	BEQZ	X30, done
+
+loop1:
+	MOV	0(X5), X10	// x
+
+	MULHU	X10, X6, X12	// z_hi = x * y
+	MUL	X10, X6, X10	// z_lo = x * y
+	ADD	X10, X29, X13	// z_lo + c
+	SLTU	X10, X13, X15
+	ADD	X12, X15, X29	// next c
+
+	MOV	X13, 0(X7)	// z
+
+	ADD	$8, X5
+	ADD	$8, X7
+	SUB	$1, X30
+
+	BNEZ	X30, loop1
+
+done:
+	MOV	X29, c+64(FP)	// return c
+	RET
 
 TEXT ·addMulVVW(SB),NOSPLIT,$0
-	JMP ·addMulVVW_g(SB)
+	MOV	x+24(FP), X5
+	MOV	y+48(FP), X6
+	MOV	z+0(FP), X7
+	MOV	z_len+8(FP), X30
 
+	MOV	$4, X28
+	MOV	$0, X29		// c = 0
+
+	BEQZ	X30, done
+	BLTU	X30, X28, loop1
+
+loop4:
+	MOV	0(X5), X8	// x[0]
+	MOV	0(X7), X10	// z[0]
+	MOV	8(X5), X11	// x[1]
+	MOV	8(X7), X13	// z[1]
+	MOV	16(X5), X14	// x[2]
+	MOV	16(X7), X16	// z[2]
+	MOV	24(X5), X17	// x[3]
+	MOV	24(X7), X19	// z[3]
+
+	MULHU	X8, X6, X9	// z_hi[0] = x[0] * y
+	MUL	X8, X6, X8	// z_lo[0] = x[0] * y
+	ADD	X8, X10, X21	// z_lo[0] = x[0] * y + z[0]
+	SLTU	X8, X21, X22
+	ADD	X9, X22, X9	// z_hi[0] = x[0] * y + z[0]
+	ADD	X21, X29, X10	// z[0] = x[0] * y + z[0] + c
+	SLTU	X21, X10, X22
+	ADD	X9, X22, X29	// next c
+
+	MULHU	X11, X6, X12	// z_hi[1] = x[1] * y
+	MUL	X11, X6, X11	// z_lo[1] = x[1] * y
+	ADD	X11, X13, X21	// z_lo[1] = x[1] * y + z[1]
+	SLTU	X11, X21, X22
+	ADD	X12, X22, X12	// z_hi[1] = x[1] * y + z[1]
+	ADD	X21, X29, X13	// z[1] = x[1] * y + z[1] + c
+	SLTU	X21, X13, X22
+	ADD	X12, X22, X29	// next c
+
+	MULHU	X14, X6, X15	// z_hi[2] = x[2] * y
+	MUL	X14, X6, X14	// z_lo[2] = x[2] * y
+	ADD	X14, X16, X21	// z_lo[2] = x[2] * y + z[2]
+	SLTU	X14, X21, X22
+	ADD	X15, X22, X15	// z_hi[2] = x[2] * y + z[2]
+	ADD	X21, X29, X16	// z[2] = x[2] * y + z[2] + c
+	SLTU	X21, X16, X22
+	ADD	X15, X22, X29	// next c
+
+	MULHU	X17, X6, X18	// z_hi[3] = x[3] * y
+	MUL	X17, X6, X17	// z_lo[3] = x[3] * y
+	ADD	X17, X19, X21	// z_lo[3] = x[3] * y + z[3]
+	SLTU	X17, X21, X22
+	ADD	X18, X22, X18	// z_hi[3] = x[3] * y + z[3]
+	ADD	X21, X29, X19	// z[3] = x[3] * y + z[3] + c
+	SLTU	X21, X19, X22
+	ADD	X18, X22, X29	// next c
+
+	MOV	X10, 0(X7)	// z[0]
+	MOV	X13, 8(X7)	// z[1]
+	MOV	X16, 16(X7)	// z[2]
+	MOV	X19, 24(X7)	// z[3]
+
+	ADD	$32, X5
+	ADD	$32, X7
+	SUB	$4, X30
+
+	BGEU	X30, X28, loop4
+	BEQZ	X30, done
+
+loop1:
+	MOV	0(X5), X10	// x
+	MOV	0(X7), X11	// z
+
+	MULHU	X10, X6, X12	// z_hi = x * y
+	MUL	X10, X6, X10	// z_lo = x * y
+	ADD	X10, X11, X13	// z_lo = x * y + z
+	SLTU	X10, X13, X15
+	ADD	X12, X15, X12	// z_hi = x * y + z
+	ADD	X13, X29, X10	// z = x * y + z + c
+	SLTU	X13, X10, X15
+	ADD	X12, X15, X29	// next c
+
+	MOV	X10, 0(X7)	// z
+
+	ADD	$8, X5
+	ADD	$8, X7
+	SUB	$1, X30
+
+	BNEZ	X30, loop1
+
+done:
+	MOV	X29, c+56(FP)	// return c
+	RET
diff --git a/src/math/big/floatmarsh.go b/src/math/big/floatmarsh.go
index 16be9469..e220cbc9 100644
--- a/src/math/big/floatmarsh.go
+++ b/src/math/big/floatmarsh.go
@@ -48,10 +48,10 @@ func (x *Float) GobEncode() ([]byte, error) {
 		b |= 1
 	}
 	buf[1] = b
-	byteorder.BePutUint32(buf[2:], x.prec)
+	byteorder.BEPutUint32(buf[2:], x.prec)
 
 	if x.form == finite {
-		byteorder.BePutUint32(buf[6:], uint32(x.exp))
+		byteorder.BEPutUint32(buf[6:], uint32(x.exp))
 		x.mant[len(x.mant)-n:].bytes(buf[10:]) // cut off unused trailing words
 	}
 
@@ -84,13 +84,13 @@ func (z *Float) GobDecode(buf []byte) error {
 	z.acc = Accuracy((b>>3)&3) - 1
 	z.form = form((b >> 1) & 3)
 	z.neg = b&1 != 0
-	z.prec = byteorder.BeUint32(buf[2:])
+	z.prec = byteorder.BEUint32(buf[2:])
 
 	if z.form == finite {
 		if len(buf) < 10 {
 			return errors.New("Float.GobDecode: buffer too small for finite form float")
 		}
-		z.exp = int32(byteorder.BeUint32(buf[6:]))
+		z.exp = int32(byteorder.BEUint32(buf[6:]))
 		z.mant = z.mant.setBytes(buf[10:])
 	}
 
@@ -106,15 +106,21 @@ func (z *Float) GobDecode(buf []byte) error {
 	return nil
 }
 
+// AppendText implements the [encoding.TextAppender] interface.
+// Only the [Float] value is marshaled (in full precision), other
+// attributes such as precision or accuracy are ignored.
+func (x *Float) AppendText(b []byte) ([]byte, error) {
+	if x == nil {
+		return append(b, ""...), nil
+	}
+	return x.Append(b, 'g', -1), nil
+}
+
 // MarshalText implements the [encoding.TextMarshaler] interface.
 // Only the [Float] value is marshaled (in full precision), other
 // attributes such as precision or accuracy are ignored.
 func (x *Float) MarshalText() (text []byte, err error) {
-	if x == nil {
-		return []byte(""), nil
-	}
-	var buf []byte
-	return x.Append(buf, 'g', -1), nil
+	return x.AppendText(nil)
 }
 
 // UnmarshalText implements the [encoding.TextUnmarshaler] interface.
diff --git a/src/math/big/floatmarsh_test.go b/src/math/big/floatmarsh_test.go
index 20def68a..339cb537 100644
--- a/src/math/big/floatmarsh_test.go
+++ b/src/math/big/floatmarsh_test.go
@@ -171,3 +171,46 @@ func TestFloatGobDecodeInvalid(t *testing.T) {
 		}
 	}
 }
+
+func TestFloatAppendText(t *testing.T) {
+	for _, test := range floatVals {
+		for _, sign := range []string{"", "+", "-"} {
+			for _, prec := range []uint{0, 1, 2, 10, 53, 64, 100, 1000} {
+				if prec > 53 && testing.Short() {
+					continue
+				}
+				x := sign + test
+				var tx Float
+				_, _, err := tx.SetPrec(prec).Parse(x, 0)
+				if err != nil {
+					t.Errorf("parsing of %s (prec = %d) failed (invalid test case): %v", x, prec, err)
+					continue
+				}
+				buf := make([]byte, 4, 32)
+				b, err := tx.AppendText(buf)
+				if err != nil {
+					t.Errorf("marshaling of %v (prec = %d) failed: %v", &tx, prec, err)
+					continue
+				}
+				var rx Float
+				rx.SetPrec(prec)
+				if err := rx.UnmarshalText(b[4:]); err != nil {
+					t.Errorf("unmarshaling of %v (prec = %d) failed: %v", &tx, prec, err)
+					continue
+				}
+				if rx.Cmp(&tx) != 0 {
+					t.Errorf("AppendText of %v (prec = %d) failed: got %v want %v", &tx, prec, &rx, &tx)
+				}
+			}
+		}
+	}
+}
+
+func TestFloatAppendTextNil(t *testing.T) {
+	var x *Float
+	buf := make([]byte, 4, 16)
+	data, _ := x.AppendText(buf)
+	if string(data[4:]) != "" {
+		t.Errorf("got %q, want ", data[4:])
+	}
+}
diff --git a/src/math/big/ftoa.go b/src/math/big/ftoa.go
index f7a4345d..c5939d73 100644
--- a/src/math/big/ftoa.go
+++ b/src/math/big/ftoa.go
@@ -309,7 +309,7 @@ func fmtF(buf []byte, prec int, d decimal) []byte {
 }
 
 // fmtB appends the string of x in the format mantissa "p" exponent
-// with a decimal mantissa and a binary exponent, or 0" if x is zero,
+// with a decimal mantissa and a binary exponent, or "0" if x is zero,
 // and returns the extended buffer.
 // The mantissa is normalized such that is uses x.Prec() bits in binary
 // representation.
diff --git a/src/math/big/int.go b/src/math/big/int.go
index 944b70c0..df44e9dc 100644
--- a/src/math/big/int.go
+++ b/src/math/big/int.go
@@ -288,7 +288,7 @@ func (z *Int) Rem(x, y *Int) *Int {
 //	r = x - y*q
 //
 // (See Daan Leijen, “Division and Modulus for Computer Scientists”.)
-// See [DivMod] for Euclidean division and modulus (unlike Go).
+// See [Int.DivMod] for Euclidean division and modulus (unlike Go).
 func (z *Int) QuoRem(x, y, r *Int) (*Int, *Int) {
 	z.abs, r.abs = z.abs.div(r.abs, x.abs, y.abs)
 	z.neg, r.neg = len(z.abs) > 0 && x.neg != y.neg, len(r.abs) > 0 && x.neg // 0 has no sign
diff --git a/src/math/big/intmarsh.go b/src/math/big/intmarsh.go
index 56eeefb8..858ca0fa 100644
--- a/src/math/big/intmarsh.go
+++ b/src/math/big/intmarsh.go
@@ -45,12 +45,14 @@ func (z *Int) GobDecode(buf []byte) error {
 	return nil
 }
 
+// AppendText implements the [encoding.TextAppender] interface.
+func (x *Int) AppendText(b []byte) (text []byte, err error) {
+	return x.Append(b, 10), nil
+}
+
 // MarshalText implements the [encoding.TextMarshaler] interface.
 func (x *Int) MarshalText() (text []byte, err error) {
-	if x == nil {
-		return []byte(""), nil
-	}
-	return x.abs.itoa(x.neg, 10), nil
+	return x.AppendText(nil)
 }
 
 // UnmarshalText implements the [encoding.TextUnmarshaler] interface.
diff --git a/src/math/big/intmarsh_test.go b/src/math/big/intmarsh_test.go
index 8e7d29f9..681f3dd9 100644
--- a/src/math/big/intmarsh_test.go
+++ b/src/math/big/intmarsh_test.go
@@ -132,3 +132,36 @@ func TestIntXMLEncoding(t *testing.T) {
 		}
 	}
 }
+
+func TestIntAppendText(t *testing.T) {
+	for _, test := range encodingTests {
+		for _, sign := range []string{"", "+", "-"} {
+			x := sign + test
+			var tx Int
+			tx.SetString(x, 10)
+			buf := make([]byte, 4, 32)
+			b, err := tx.AppendText(buf)
+			if err != nil {
+				t.Errorf("marshaling of %s failed: %s", &tx, err)
+				continue
+			}
+			var rx Int
+			if err := rx.UnmarshalText(b[4:]); err != nil {
+				t.Errorf("unmarshaling of %s failed: %s", &tx, err)
+				continue
+			}
+			if rx.Cmp(&tx) != 0 {
+				t.Errorf("AppendText of %s failed: got %s want %s", &tx, &rx, &tx)
+			}
+		}
+	}
+}
+
+func TestIntAppendTextNil(t *testing.T) {
+	var x *Int
+	buf := make([]byte, 4, 16)
+	data, _ := x.AppendText(buf)
+	if string(data[4:]) != "" {
+		t.Errorf("got %q, want ", data[4:])
+	}
+}
diff --git a/src/math/big/nat.go b/src/math/big/nat.go
index 23b2a0b8..541da229 100644
--- a/src/math/big/nat.go
+++ b/src/math/big/nat.go
@@ -1321,9 +1321,9 @@ func (z nat) bytes(buf []byte) (i int) {
 // bigEndianWord returns the contents of buf interpreted as a big-endian encoded Word value.
 func bigEndianWord(buf []byte) Word {
 	if _W == 64 {
-		return Word(byteorder.BeUint64(buf))
+		return Word(byteorder.BEUint64(buf))
 	}
-	return Word(byteorder.BeUint32(buf))
+	return Word(byteorder.BEUint32(buf))
 }
 
 // setBytes interprets buf as the bytes of a big-endian unsigned
diff --git a/src/math/big/natdiv.go b/src/math/big/natdiv.go
index b55f9990..2e66e342 100644
--- a/src/math/big/natdiv.go
+++ b/src/math/big/natdiv.go
@@ -602,7 +602,7 @@ func (z nat) divLarge(u, uIn, vIn nat) (q, r nat) {
 	v := *vp
 	shlVU(v, vIn, shift)
 	u = u.make(len(uIn) + 1)
-	u[len(uIn)] = shlVU(u[0:len(uIn)], uIn, shift)
+	u[len(uIn)] = shlVU(u[:len(uIn)], uIn, shift)
 
 	// The caller should not pass aliased z and u, since those are
 	// the two different outputs, but correct just in case.
@@ -642,15 +642,14 @@ func (q nat) divBasic(u, v nat) {
 	vn1 := v[n-1]
 	rec := reciprocalWord(vn1)
 
+	// Invent a leading 0 for u, for the first iteration.
+	// Invariant: ujn == u[j+n] in each iteration.
+	ujn := Word(0)
+
 	// Compute each digit of quotient.
 	for j := m; j >= 0; j-- {
 		// Compute the 2-by-1 guess q̂.
-		// The first iteration must invent a leading 0 for u.
 		qhat := Word(_M)
-		var ujn Word
-		if j+n < len(u) {
-			ujn = u[j+n]
-		}
 
 		// ujn ≤ vn1, or else q̂ would be more than one digit.
 		// For ujn == vn1, we set q̂ to the max digit M above.
@@ -699,6 +698,8 @@ func (q nat) divBasic(u, v nat) {
 			qhat--
 		}
 
+		ujn = u[j+n-1]
+
 		// Save quotient digit.
 		// Caller may know the top digit is zero and not leave room for it.
 		if j == m && m == len(q) && qhat == 0 {
@@ -884,7 +885,7 @@ func (z nat) divRecursiveStep(u, v nat, depth int, tmp *nat, temps []*nat) {
 	if qhatv.cmp(u.norm()) > 0 {
 		panic("impossible")
 	}
-	c := subVV(u[0:len(qhatv)], u[0:len(qhatv)], qhatv)
+	c := subVV(u[:len(qhatv)], u[:len(qhatv)], qhatv)
 	if c > 0 {
 		c = subVW(u[len(qhatv):], u[len(qhatv):], c)
 	}
diff --git a/src/math/big/ratconv.go b/src/math/big/ratconv.go
index dd99aecd..12f9888c 100644
--- a/src/math/big/ratconv.go
+++ b/src/math/big/ratconv.go
@@ -299,12 +299,13 @@ func scanExponent(r io.ByteScanner, base2ok, sepOk bool) (exp int64, base int, e
 
 // String returns a string representation of x in the form "a/b" (even if b == 1).
 func (x *Rat) String() string {
-	return string(x.marshal())
+	return string(x.marshal(nil))
 }
 
-// marshal implements String returning a slice of bytes
-func (x *Rat) marshal() []byte {
-	var buf []byte
+// marshal implements [Rat.String] returning a slice of bytes.
+// It appends the string representation of x in the form "a/b" (even if b == 1) to buf,
+// and returns the extended buffer.
+func (x *Rat) marshal(buf []byte) []byte {
 	buf = x.a.Append(buf, 10)
 	buf = append(buf, '/')
 	if len(x.b.abs) != 0 {
diff --git a/src/math/big/ratmarsh.go b/src/math/big/ratmarsh.go
index 69628294..26ded1d9 100644
--- a/src/math/big/ratmarsh.go
+++ b/src/math/big/ratmarsh.go
@@ -29,7 +29,7 @@ func (x *Rat) GobEncode() ([]byte, error) {
 		// this should never happen
 		return nil, errors.New("Rat.GobEncode: numerator too large")
 	}
-	byteorder.BePutUint32(buf[j-4:j], uint32(n))
+	byteorder.BEPutUint32(buf[j-4:j], uint32(n))
 	j -= 1 + 4
 	b := ratGobVersion << 1 // make space for sign bit
 	if x.a.neg {
@@ -54,7 +54,7 @@ func (z *Rat) GobDecode(buf []byte) error {
 		return fmt.Errorf("Rat.GobDecode: encoding version %d not supported", b>>1)
 	}
 	const j = 1 + 4
-	ln := byteorder.BeUint32(buf[j-4 : j])
+	ln := byteorder.BEUint32(buf[j-4 : j])
 	if uint64(ln) > math.MaxInt-j {
 		return errors.New("Rat.GobDecode: invalid length")
 	}
@@ -68,12 +68,17 @@ func (z *Rat) GobDecode(buf []byte) error {
 	return nil
 }
 
+// AppendText implements the [encoding.TextAppender] interface.
+func (x *Rat) AppendText(b []byte) ([]byte, error) {
+	if x.IsInt() {
+		return x.a.AppendText(b)
+	}
+	return x.marshal(b), nil
+}
+
 // MarshalText implements the [encoding.TextMarshaler] interface.
 func (x *Rat) MarshalText() (text []byte, err error) {
-	if x.IsInt() {
-		return x.a.MarshalText()
-	}
-	return x.marshal(), nil
+	return x.AppendText(nil)
 }
 
 // UnmarshalText implements the [encoding.TextUnmarshaler] interface.
diff --git a/src/math/big/ratmarsh_test.go b/src/math/big/ratmarsh_test.go
index 15c933ef..7d139bca 100644
--- a/src/math/big/ratmarsh_test.go
+++ b/src/math/big/ratmarsh_test.go
@@ -136,3 +136,26 @@ func TestRatGobDecodeShortBuffer(t *testing.T) {
 		}
 	}
 }
+
+func TestRatAppendText(t *testing.T) {
+	for _, num := range ratNums {
+		for _, denom := range ratDenoms {
+			var tx Rat
+			tx.SetString(num + "/" + denom)
+			buf := make([]byte, 4, 32)
+			b, err := tx.AppendText(buf)
+			if err != nil {
+				t.Errorf("marshaling of %s failed: %s", &tx, err)
+				continue
+			}
+			var rx Rat
+			if err := rx.UnmarshalText(b[4:]); err != nil {
+				t.Errorf("unmarshaling of %s failed: %s", &tx, err)
+				continue
+			}
+			if rx.Cmp(&tx) != 0 {
+				t.Errorf("AppendText of %s failed: got %s want %s", &tx, &rx, &tx)
+			}
+		}
+	}
+}
diff --git a/src/math/bits/bits.go b/src/math/bits/bits.go
index 235d63e8..76ed1d03 100644
--- a/src/math/bits/bits.go
+++ b/src/math/bits/bits.go
@@ -38,7 +38,7 @@ func LeadingZeros64(x uint64) int { return 64 - Len64(x) }
 
 // --- TrailingZeros ---
 
-// See http://supertech.csail.mit.edu/papers/debruijn.pdf
+// See http://keithandkatie.com/keith/papers/debruijn.html
 const deBruijn32 = 0x077CB531
 
 var deBruijn32tab = [32]byte{
diff --git a/src/math/bits/bits_test.go b/src/math/bits/bits_test.go
index 23b4539f..6f6e1c22 100644
--- a/src/math/bits/bits_test.go
+++ b/src/math/bits/bits_test.go
@@ -1109,7 +1109,7 @@ func TestDiv64PanicZero(t *testing.T) {
 }
 
 func TestRem32(t *testing.T) {
-	// Sanity check: for non-oveflowing dividends, the result is the
+	// Sanity check: for non-overflowing dividends, the result is the
 	// same as the rem returned by Div32
 	hi, lo, y := uint32(510510), uint32(9699690), uint32(510510+1) // ensure hi < y
 	for i := 0; i < 1000; i++ {
@@ -1136,7 +1136,7 @@ func TestRem32Overflow(t *testing.T) {
 }
 
 func TestRem64(t *testing.T) {
-	// Sanity check: for non-oveflowing dividends, the result is the
+	// Sanity check: for non-overflowing dividends, the result is the
 	// same as the rem returned by Div64
 	hi, lo, y := uint64(510510), uint64(9699690), uint64(510510+1) // ensure hi < y
 	for i := 0; i < 1000; i++ {
diff --git a/src/math/dim_asm.go b/src/math/dim_asm.go
index f4adbd0a..a1d23dd0 100644
--- a/src/math/dim_asm.go
+++ b/src/math/dim_asm.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build amd64 || arm64 || riscv64 || s390x
+//go:build amd64 || arm64 || loong64 || riscv64 || s390x
 
 package math
 
diff --git a/src/math/dim_loong64.s b/src/math/dim_loong64.s
new file mode 100644
index 00000000..1484bf76
--- /dev/null
+++ b/src/math/dim_loong64.s
@@ -0,0 +1,77 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "textflag.h"
+
+#define PosInf 0x7FF0000000000000
+#define NaN    0x7FF8000000000001
+#define NegInf 0xFFF0000000000000
+
+TEXT ·archMax(SB),NOSPLIT,$0
+	MOVD	x+0(FP), F0
+	MOVD	y+8(FP), F1
+	FCLASSD	F0, F2
+	FCLASSD	F1, F3
+
+	// combine x and y categories together to judge
+	MOVV	F2, R4
+	MOVV	F3, R5
+	OR	R5, R4
+
+	// +Inf special cases
+	AND	$64, R4, R5
+	BNE	R5, isPosInf
+
+	// NaN special cases
+	AND	$2, R4, R5
+	BNE	R5, isMaxNaN
+
+	// normal case
+	FMAXD	F0, F1, F0
+	MOVD	F0, ret+16(FP)
+	RET
+
+isMaxNaN:
+	MOVV	$NaN, R6
+	MOVV	R6, ret+16(FP)
+	RET
+
+isPosInf:
+	MOVV	$PosInf, R6
+	MOVV	R6, ret+16(FP)
+	RET
+
+TEXT ·archMin(SB),NOSPLIT,$0
+	MOVD	x+0(FP), F0
+	MOVD	y+8(FP), F1
+	FCLASSD	F0, F2
+	FCLASSD	F1, F3
+
+	// combine x and y categories together to judge
+	MOVV	F2, R4
+	MOVV	F3, R5
+	OR	R5, R4
+
+	// -Inf special cases
+	AND	$4, R4, R5
+	BNE	R5, isNegInf
+
+	// NaN special cases
+	AND	$2, R4, R5
+	BNE	R5, isMinNaN
+
+	// normal case
+	FMIND	F0, F1, F0
+	MOVD	F0, ret+16(FP)
+	RET
+
+isMinNaN:
+	MOVV	$NaN, R6
+	MOVV	R6, ret+16(FP)
+	RET
+
+isNegInf:
+	MOVV	$NegInf, R6
+	MOVV	R6, ret+16(FP)
+	RET
diff --git a/src/math/dim_noasm.go b/src/math/dim_noasm.go
index 5b9e06fe..6f4917b8 100644
--- a/src/math/dim_noasm.go
+++ b/src/math/dim_noasm.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build !amd64 && !arm64 && !riscv64 && !s390x
+//go:build !amd64 && !arm64 && !loong64 && !riscv64 && !s390x
 
 package math
 
diff --git a/src/math/floor_asm.go b/src/math/floor_asm.go
index fb419d6d..1b06b8de 100644
--- a/src/math/floor_asm.go
+++ b/src/math/floor_asm.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build 386 || amd64 || arm64 || ppc64 || ppc64le || s390x || wasm
+//go:build 386 || amd64 || arm64 || loong64 || ppc64 || ppc64le || riscv64 || s390x || wasm
 
 package math
 
diff --git a/src/math/floor_loong64.s b/src/math/floor_loong64.s
new file mode 100644
index 00000000..0df7deee
--- /dev/null
+++ b/src/math/floor_loong64.s
@@ -0,0 +1,41 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+//
+// derived from math/floor_riscv64.s
+
+#include "textflag.h"
+
+#define ROUNDFN(NAME, FUNC)	\
+TEXT NAME(SB),NOSPLIT,$0;	\
+	MOVD	x+0(FP), F0;	\
+	MOVV	F0, R11;	\
+	/* 1023: bias of exponent, [-2^53, 2^53]: exactly integer represent range */;	\
+	MOVV	$1023+53, R12;	\
+	/* Drop all fraction bits */;	\
+	SRLV	$52, R11, R11;	\
+	/* Remove sign bit */;	\
+	AND	$0x7FF, R11, R11;	\
+	BLTU	R12, R11, isExtremum;	\
+normal:;	\
+	FUNC	F0, F2;	\
+	MOVV	F2, R10;	\
+	BEQ	R10, R0, is0;	\
+	FFINTDV	F2, F0;	\
+/* Return either input is +-Inf, NaN(0x7FF) or out of precision limitation */;	\
+isExtremum:;	\
+	MOVD	F0, ret+8(FP);	\
+	RET;	\
+is0:;	\
+	FCOPYSGD	F0, F2, F2;	\
+	MOVD	F2, ret+8(FP);	\
+	RET
+
+// func archFloor(x float64) float64
+ROUNDFN(·archFloor, FTINTRMVD)
+
+// func archCeil(x float64) float64
+ROUNDFN(·archCeil, FTINTRPVD)
+
+// func archTrunc(x float64) float64
+ROUNDFN(·archTrunc, FTINTRZVD)
diff --git a/src/math/floor_noasm.go b/src/math/floor_noasm.go
index 5641c7ea..34bd292f 100644
--- a/src/math/floor_noasm.go
+++ b/src/math/floor_noasm.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build !386 && !amd64 && !arm64 && !ppc64 && !ppc64le && !s390x && !wasm
+//go:build !386 && !amd64 && !arm64 && !loong64 && !ppc64 && !ppc64le && !riscv64 && !s390x && !wasm
 
 package math
 
diff --git a/src/math/floor_riscv64.s b/src/math/floor_riscv64.s
new file mode 100644
index 00000000..d9fe0ed8
--- /dev/null
+++ b/src/math/floor_riscv64.s
@@ -0,0 +1,48 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "textflag.h"
+
+// RISC-V offered floating-point (FP) rounding by FP conversion instructions (FCVT)
+// with rounding mode field.
+// As Go spec expects FP rounding result in FP, we have to use FCVT integer
+// back to FP (fp -> int -> fp).
+// RISC-V only set Inexact flag during invalid FP-integer conversion without changing any data,
+// on the other hand, RISC-V sets out of integer represent range yet valid FP into NaN.
+// When it comes to integer-FP conversion, invalid FP like NaN, +-Inf will be
+// converted into the closest valid FP, for example:
+//
+// `Floor(-Inf) -> int64(0x7fffffffffffffff) -> float64(9.22e+18)`
+// `Floor(18446744073709549568.0) -> int64(0x7fffffffffffffff) -> float64(9.22e+18)`
+//
+// This ISA conversion limitation requires we skip all invalid or out of range FP
+// before any normal rounding operations.
+
+#define ROUNDFN(NAME, MODE) 	\
+TEXT NAME(SB),NOSPLIT,$0; 	\
+	MOVD	x+0(FP), F10; 	\
+	FMVXD	F10, X10;	\
+	/* Drop all fraction bits */;\
+	SRL	$52, X10, X12;	\
+	/* Remove sign bit */;	\
+	AND	$0x7FF, X12, X12;\
+	/* Return either input is +-Inf, NaN(0x7FF) or out of precision limitation */;\
+	/* 1023: bias of exponent, [-2^53, 2^53]: exactly integer represent range */;\
+	MOV	$1023+53, X11;	\
+	BLTU	X11, X12, 4(PC);\
+	FCVTLD.MODE F10, X11;	\
+	FCVTDL	X11, F11;	\
+	/* RISC-V rounds negative values to +0, restore original sign */;\
+	FSGNJD	F10, F11, F10;	\
+	MOVD	F10, ret+8(FP); \
+	RET
+
+// func archFloor(x float64) float64
+ROUNDFN(·archFloor, RDN)
+
+// func archCeil(x float64) float64
+ROUNDFN(·archCeil, RUP)
+
+// func archTrunc(x float64) float64
+ROUNDFN(·archTrunc, RTZ)
diff --git a/src/math/rand/default_test.go b/src/math/rand/default_test.go
index 19fd75df..b42cd165 100644
--- a/src/math/rand/default_test.go
+++ b/src/math/rand/default_test.go
@@ -37,11 +37,7 @@ func TestDefaultRace(t *testing.T) {
 		i := i
 		t.Run(strconv.Itoa(i), func(t *testing.T) {
 			t.Parallel()
-			exe, err := os.Executable()
-			if err != nil {
-				exe = os.Args[0]
-			}
-			cmd := testenv.Command(t, exe, "-test.run=TestDefaultRace")
+			cmd := testenv.Command(t, testenv.Executable(t), "-test.run=TestDefaultRace")
 			cmd = testenv.CleanCmdEnv(cmd)
 			cmd.Env = append(cmd.Env, fmt.Sprintf("GO_RAND_TEST_HELPER_CODE=%d", i/2))
 			if i%2 != 0 {
diff --git a/src/math/rand/rand.go b/src/math/rand/rand.go
index 61ff5c1b..4be1ca20 100644
--- a/src/math/rand/rand.go
+++ b/src/math/rand/rand.go
@@ -313,6 +313,9 @@ var globalRandGenerator atomic.Pointer[Rand]
 
 var randautoseed = godebug.New("randautoseed")
 
+// randseednop controls whether the global Seed is a no-op.
+var randseednop = godebug.New("randseednop")
+
 // globalRand returns the generator to use for the top-level convenience
 // functions.
 func globalRand() *Rand {
@@ -391,7 +394,15 @@ func (fs *runtimeSource) read(p []byte, readVal *int64, readPos *int8) (n int, e
 // a random value. Programs that call Seed with a known value to get
 // a specific sequence of results should use New(NewSource(seed)) to
 // obtain a local random generator.
+//
+// As of Go 1.24 [Seed] is a no-op. To restore the previous behavior set
+// GODEBUG=randseednop=0.
 func Seed(seed int64) {
+	if randseednop.Value() != "0" {
+		return
+	}
+	randseednop.IncNonDefault()
+
 	orig := globalRandGenerator.Load()
 
 	// If we are already using a lockedSource, we can just re-seed it.
diff --git a/src/math/rand/rand_test.go b/src/math/rand/rand_test.go
index 7906f296..1e1fad79 100644
--- a/src/math/rand/rand_test.go
+++ b/src/math/rand/rand_test.go
@@ -556,6 +556,42 @@ func TestUniformFactorial(t *testing.T) {
 	}
 }
 
+func TestSeedNop(t *testing.T) {
+	// If the global Seed takes effect, then resetting it to a certain value
+	// should provide predictable output to functions using it.
+	t.Run("randseednop=0", func(t *testing.T) {
+		t.Setenv("GODEBUG", "randseednop=0")
+		Seed(1)
+		before := Int63()
+		Seed(1)
+		after := Int63()
+		if before != after {
+			t.Fatal("global Seed should take effect")
+		}
+	})
+	// If calls to the global Seed are no-op then functions using it should
+	// provide different output, even if it was reset to the same value.
+	t.Run("randseednop=1", func(t *testing.T) {
+		t.Setenv("GODEBUG", "randseednop=1")
+		Seed(1)
+		before := Int63()
+		Seed(1)
+		after := Int63()
+		if before == after {
+			t.Fatal("global Seed should be a no-op")
+		}
+	})
+	t.Run("GODEBUG unset", func(t *testing.T) {
+		Seed(1)
+		before := Int63()
+		Seed(1)
+		after := Int63()
+		if before == after {
+			t.Fatal("global Seed should default to being a no-op")
+		}
+	})
+}
+
 // Benchmarks
 
 func BenchmarkInt63Threadsafe(b *testing.B) {
diff --git a/src/math/rand/v2/chacha8.go b/src/math/rand/v2/chacha8.go
index f9eaacf6..eb43e659 100644
--- a/src/math/rand/v2/chacha8.go
+++ b/src/math/rand/v2/chacha8.go
@@ -58,19 +58,19 @@ func (c *ChaCha8) Read(p []byte) (n int, err error) {
 		p = p[n:]
 	}
 	for len(p) >= 8 {
-		byteorder.LePutUint64(p, c.Uint64())
+		byteorder.LEPutUint64(p, c.Uint64())
 		p = p[8:]
 		n += 8
 	}
 	if len(p) > 0 {
-		byteorder.LePutUint64(c.readBuf[:], c.Uint64())
+		byteorder.LEPutUint64(c.readBuf[:], c.Uint64())
 		n += copy(p, c.readBuf[:])
 		c.readLen = 8 - len(p)
 	}
 	return
 }
 
-// UnmarshalBinary implements the encoding.BinaryUnmarshaler interface.
+// UnmarshalBinary implements the [encoding.BinaryUnmarshaler] interface.
 func (c *ChaCha8) UnmarshalBinary(data []byte) error {
 	data, ok := cutPrefix(data, []byte("readbuf:"))
 	if ok {
@@ -98,13 +98,18 @@ func readUint8LengthPrefixed(b []byte) (buf, rest []byte, ok bool) {
 	return b[1 : 1+b[0]], b[1+b[0]:], true
 }
 
-// MarshalBinary implements the encoding.BinaryMarshaler interface.
-func (c *ChaCha8) MarshalBinary() ([]byte, error) {
+// AppendBinary implements the [encoding.BinaryAppender] interface.
+func (c *ChaCha8) AppendBinary(b []byte) ([]byte, error) {
 	if c.readLen > 0 {
-		out := []byte("readbuf:")
-		out = append(out, uint8(c.readLen))
-		out = append(out, c.readBuf[len(c.readBuf)-c.readLen:]...)
-		return append(out, chacha8rand.Marshal(&c.state)...), nil
+		b = append(b, "readbuf:"...)
+		b = append(b, uint8(c.readLen))
+		b = append(b, c.readBuf[len(c.readBuf)-c.readLen:]...)
 	}
-	return chacha8rand.Marshal(&c.state), nil
+	return append(b, chacha8rand.Marshal(&c.state)...), nil
+}
+
+// MarshalBinary implements the [encoding.BinaryMarshaler] interface.
+func (c *ChaCha8) MarshalBinary() ([]byte, error) {
+	// the maximum length of (chacha8rand.Marshal + c.readBuf + "readbuf:") is 64
+	return c.AppendBinary(make([]byte, 0, 64))
 }
diff --git a/src/math/rand/v2/chacha8_test.go b/src/math/rand/v2/chacha8_test.go
index 50e83ea1..ba11b7cc 100644
--- a/src/math/rand/v2/chacha8_test.go
+++ b/src/math/rand/v2/chacha8_test.go
@@ -98,6 +98,22 @@ func TestChaCha8Read(t *testing.T) {
 	}
 }
 
+func BenchmarkChaCha8MarshalBinary(b *testing.B) {
+	p := NewChaCha8(chacha8seed)
+	for range b.N {
+		p.MarshalBinary()
+	}
+}
+
+func BenchmarkChaCha8MarshalBinaryRead(b *testing.B) {
+	p := NewChaCha8(chacha8seed)
+	buf := make([]byte, 1)
+	for range b.N {
+		p.MarshalBinary()
+		p.Read(buf)
+	}
+}
+
 func TestChaCha8Marshal(t *testing.T) {
 	p := NewChaCha8(chacha8seed)
 	for i, x := range chacha8output {
@@ -108,6 +124,17 @@ func TestChaCha8Marshal(t *testing.T) {
 		if string(enc) != chacha8marshal[i] {
 			t.Errorf("#%d: MarshalBinary=%q, want %q", i, enc, chacha8marshal[i])
 		}
+
+		b := make([]byte, 4, 32)
+		b, err = p.AppendBinary(b)
+		encAppend := b[4:]
+		if err != nil {
+			t.Fatalf("#%d: AppendBinary: %v", i, err)
+		}
+		if string(encAppend) != chacha8marshal[i] {
+			t.Errorf("#%d: AppendBinary=%q, want %q", i, encAppend, chacha8marshal[i])
+		}
+
 		*p = ChaCha8{}
 		if err := p.UnmarshalBinary(enc); err != nil {
 			t.Fatalf("#%d: UnmarshalBinary: %v", i, err)
@@ -128,6 +155,17 @@ func TestChaCha8MarshalRead(t *testing.T) {
 		if string(enc) != chacha8marshalread[i] {
 			t.Errorf("#%d: MarshalBinary=%q, want %q", i, enc, chacha8marshalread[i])
 		}
+
+		b := make([]byte, 4, 32)
+		b, err = p.AppendBinary(b)
+		encAppend := b[4:]
+		if err != nil {
+			t.Fatalf("#%d: AppendBinary: %v", i, err)
+		}
+		if string(encAppend) != chacha8marshalread[i] {
+			t.Errorf("#%d: AppendBinary=%q, want %q", i, encAppend, chacha8marshalread[i])
+		}
+
 		*p = ChaCha8{}
 		if err := p.UnmarshalBinary(enc); err != nil {
 			t.Fatalf("#%d: UnmarshalBinary: %v", i, err)
diff --git a/src/math/rand/v2/pcg.go b/src/math/rand/v2/pcg.go
index 4ccd5e32..9cd7d11a 100644
--- a/src/math/rand/v2/pcg.go
+++ b/src/math/rand/v2/pcg.go
@@ -31,24 +31,28 @@ func (p *PCG) Seed(seed1, seed2 uint64) {
 	p.lo = seed2
 }
 
-// MarshalBinary implements the encoding.BinaryMarshaler interface.
-func (p *PCG) MarshalBinary() ([]byte, error) {
-	b := make([]byte, 20)
-	copy(b, "pcg:")
-	byteorder.BePutUint64(b[4:], p.hi)
-	byteorder.BePutUint64(b[4+8:], p.lo)
+// AppendBinary implements the [encoding.BinaryAppender] interface.
+func (p *PCG) AppendBinary(b []byte) ([]byte, error) {
+	b = append(b, "pcg:"...)
+	b = byteorder.BEAppendUint64(b, p.hi)
+	b = byteorder.BEAppendUint64(b, p.lo)
 	return b, nil
 }
 
+// MarshalBinary implements the [encoding.BinaryMarshaler] interface.
+func (p *PCG) MarshalBinary() ([]byte, error) {
+	return p.AppendBinary(make([]byte, 0, 20))
+}
+
 var errUnmarshalPCG = errors.New("invalid PCG encoding")
 
-// UnmarshalBinary implements the encoding.BinaryUnmarshaler interface.
+// UnmarshalBinary implements the [encoding.BinaryUnmarshaler] interface.
 func (p *PCG) UnmarshalBinary(data []byte) error {
 	if len(data) != 20 || string(data[:4]) != "pcg:" {
 		return errUnmarshalPCG
 	}
-	p.hi = byteorder.BeUint64(data[4:])
-	p.lo = byteorder.BeUint64(data[4+8:])
+	p.hi = byteorder.BEUint64(data[4:])
+	p.lo = byteorder.BEUint64(data[4+8:])
 	return nil
 }
 
diff --git a/src/math/rand/v2/pcg_test.go b/src/math/rand/v2/pcg_test.go
index db866c8c..6558dab7 100644
--- a/src/math/rand/v2/pcg_test.go
+++ b/src/math/rand/v2/pcg_test.go
@@ -21,9 +21,10 @@ func BenchmarkPCG_DXSM(b *testing.B) {
 func TestPCGMarshal(t *testing.T) {
 	var p PCG
 	const (
-		seed1 = 0x123456789abcdef0
-		seed2 = 0xfedcba9876543210
-		want  = "pcg:\x12\x34\x56\x78\x9a\xbc\xde\xf0\xfe\xdc\xba\x98\x76\x54\x32\x10"
+		seed1      = 0x123456789abcdef0
+		seed2      = 0xfedcba9876543210
+		want       = "pcg:\x12\x34\x56\x78\x9a\xbc\xde\xf0\xfe\xdc\xba\x98\x76\x54\x32\x10"
+		wantAppend = "\x00\x00\x00\x00" + want
 	)
 	p.Seed(seed1, seed2)
 	data, err := p.MarshalBinary()
@@ -31,6 +32,12 @@ func TestPCGMarshal(t *testing.T) {
 		t.Errorf("MarshalBinary() = %q, %v, want %q, nil", data, err, want)
 	}
 
+	dataAppend := make([]byte, 4, 32)
+	dataAppend, err = p.AppendBinary(dataAppend)
+	if string(dataAppend) != wantAppend || err != nil {
+		t.Errorf("AppendBinary() = %q, %v, want %q, nil", dataAppend, err, wantAppend)
+	}
+
 	q := PCG{}
 	if err := q.UnmarshalBinary([]byte(want)); err != nil {
 		t.Fatalf("UnmarshalBinary(): %v", err)
diff --git a/src/math/rand/v2/rand.go b/src/math/rand/v2/rand.go
index fea1e3a2..f6b2e475 100644
--- a/src/math/rand/v2/rand.go
+++ b/src/math/rand/v2/rand.go
@@ -275,12 +275,12 @@ func Uint32() uint32 { return globalRand.Uint32() }
 
 // Uint64N returns, as a uint64, a pseudo-random number in the half-open interval [0,n)
 // from the default Source.
-// It panics if n <= 0.
+// It panics if n == 0.
 func Uint64N(n uint64) uint64 { return globalRand.Uint64N(n) }
 
 // Uint32N returns, as a uint32, a pseudo-random number in the half-open interval [0,n)
 // from the default Source.
-// It panics if n <= 0.
+// It panics if n == 0.
 func Uint32N(n uint32) uint32 { return globalRand.Uint32N(n) }
 
 // Uint64 returns a pseudo-random 64-bit value as a uint64
@@ -314,7 +314,7 @@ func IntN(n int) int { return globalRand.IntN(n) }
 
 // UintN returns, as a uint, a pseudo-random number in the half-open interval [0,n)
 // from the default Source.
-// It panics if n <= 0.
+// It panics if n == 0.
 func UintN(n uint) uint { return globalRand.UintN(n) }
 
 // N returns a pseudo-random number in the half-open interval [0,n) from the default Source.
diff --git a/src/mime/encodedword.go b/src/mime/encodedword.go
index 856433f8..c4afad04 100644
--- a/src/mime/encodedword.go
+++ b/src/mime/encodedword.go
@@ -226,7 +226,7 @@ func (d *WordDecoder) Decode(word string) (string, error) {
 }
 
 // DecodeHeader decodes all encoded-words of the given string. It returns an
-// error if and only if WordDecoder.CharsetReader of d returns an error.
+// error if and only if [WordDecoder.CharsetReader] of d returns an error.
 func (d *WordDecoder) DecodeHeader(header string) (string, error) {
 	// If there is no encoded-word, returns before creating a buffer.
 	i := strings.Index(header, "=?")
diff --git a/src/mime/mediatype.go b/src/mime/mediatype.go
index 97f3563a..f0a0be21 100644
--- a/src/mime/mediatype.go
+++ b/src/mime/mediatype.go
@@ -7,6 +7,7 @@ package mime
 import (
 	"errors"
 	"fmt"
+	"maps"
 	"slices"
 	"strings"
 	"unicode"
@@ -33,13 +34,7 @@ func FormatMediaType(t string, param map[string]string) string {
 		b.WriteString(strings.ToLower(sub))
 	}
 
-	attrs := make([]string, 0, len(param))
-	for a := range param {
-		attrs = append(attrs, a)
-	}
-	slices.Sort(attrs)
-
-	for _, attribute := range attrs {
+	for _, attribute := range slices.Sorted(maps.Keys(param)) {
 		value := param[attribute]
 		b.WriteByte(';')
 		b.WriteByte(' ')
diff --git a/src/mime/mediatype_test.go b/src/mime/mediatype_test.go
index 1458cdb6..1731f736 100644
--- a/src/mime/mediatype_test.go
+++ b/src/mime/mediatype_test.go
@@ -5,7 +5,7 @@
 package mime
 
 import (
-	"reflect"
+	"maps"
 	"strings"
 	"testing"
 )
@@ -429,7 +429,7 @@ func TestParseMediaType(t *testing.T) {
 		if len(params) == 0 && len(test.p) == 0 {
 			continue
 		}
-		if !reflect.DeepEqual(params, test.p) {
+		if !maps.Equal(params, test.p) {
 			t.Errorf("for input %#q, wrong params.\n"+
 				"expected: %#v\n"+
 				"     got: %#v",
diff --git a/src/mime/multipart/writer.go b/src/mime/multipart/writer.go
index 5e589c49..818970d7 100644
--- a/src/mime/multipart/writer.go
+++ b/src/mime/multipart/writer.go
@@ -10,6 +10,7 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"maps"
 	"net/textproto"
 	"slices"
 	"strings"
@@ -107,12 +108,7 @@ func (w *Writer) CreatePart(header textproto.MIMEHeader) (io.Writer, error) {
 		fmt.Fprintf(&b, "--%s\r\n", w.boundary)
 	}
 
-	keys := make([]string, 0, len(header))
-	for k := range header {
-		keys = append(keys, k)
-	}
-	slices.Sort(keys)
-	for _, k := range keys {
+	for _, k := range slices.Sorted(maps.Keys(header)) {
 		for _, v := range header[k] {
 			fmt.Fprintf(&b, "%s: %s\r\n", k, v)
 		}
diff --git a/src/mime/type_test.go b/src/mime/type_test.go
index d8368e88..6bdf37b6 100644
--- a/src/mime/type_test.go
+++ b/src/mime/type_test.go
@@ -5,7 +5,8 @@
 package mime
 
 import (
-	"reflect"
+	"internal/asan"
+	"slices"
 	"strings"
 	"sync"
 	"testing"
@@ -136,13 +137,16 @@ func TestExtensionsByType(t *testing.T) {
 			t.Errorf("ExtensionsByType(%q) = %q, %v; want error substring %q", tt.typ, got, err, tt.wantErr)
 			continue
 		}
-		if !reflect.DeepEqual(got, tt.want) {
+		if !slices.Equal(got, tt.want) {
 			t.Errorf("ExtensionsByType(%q) = %q; want %q", tt.typ, got, tt.want)
 		}
 	}
 }
 
 func TestLookupMallocs(t *testing.T) {
+	if asan.Enabled {
+		t.Skip("test allocates more with -asan; see #70079")
+	}
 	n := testing.AllocsPerRun(10000, func() {
 		TypeByExtension(".html")
 		TypeByExtension(".HtML")
@@ -213,7 +217,7 @@ func TestExtensionsByType2(t *testing.T) {
 			t.Errorf("ExtensionsByType(%q): %v", tt.typ, err)
 			continue
 		}
-		if !reflect.DeepEqual(got, tt.want) {
+		if !slices.Equal(got, tt.want) {
 			t.Errorf("ExtensionsByType(%q) = %q; want %q", tt.typ, got, tt.want)
 		}
 	}
diff --git a/src/net/addrselect.go b/src/net/addrselect.go
index caff09b3..0ff8ec37 100644
--- a/src/net/addrselect.go
+++ b/src/net/addrselect.go
@@ -8,7 +8,7 @@ package net
 
 import (
 	"net/netip"
-	"sort"
+	"slices"
 )
 
 func sortByRFC6724(addrs []IPAddr) {
@@ -22,19 +22,20 @@ func sortByRFC6724withSrcs(addrs []IPAddr, srcs []netip.Addr) {
 	if len(addrs) != len(srcs) {
 		panic("internal error")
 	}
-	addrAttr := make([]ipAttr, len(addrs))
-	srcAttr := make([]ipAttr, len(srcs))
+	addrInfos := make([]byRFC6724Info, len(addrs))
 	for i, v := range addrs {
 		addrAttrIP, _ := netip.AddrFromSlice(v.IP)
-		addrAttr[i] = ipAttrOf(addrAttrIP)
-		srcAttr[i] = ipAttrOf(srcs[i])
+		addrInfos[i] = byRFC6724Info{
+			addr:     addrs[i],
+			addrAttr: ipAttrOf(addrAttrIP),
+			src:      srcs[i],
+			srcAttr:  ipAttrOf(srcs[i]),
+		}
+	}
+	slices.SortStableFunc(addrInfos, compareByRFC6724)
+	for i := range addrInfos {
+		addrs[i] = addrInfos[i].addr
 	}
-	sort.Stable(&byRFC6724{
-		addrs:    addrs,
-		addrAttr: addrAttr,
-		srcs:     srcs,
-		srcAttr:  srcAttr,
-	})
 }
 
 // srcAddrs tries to UDP-connect to each address to see if it has a
@@ -75,45 +76,36 @@ func ipAttrOf(ip netip.Addr) ipAttr {
 	}
 }
 
-type byRFC6724 struct {
-	addrs    []IPAddr // addrs to sort
-	addrAttr []ipAttr
-	srcs     []netip.Addr // or not valid addr if unreachable
-	srcAttr  []ipAttr
+type byRFC6724Info struct {
+	addr     IPAddr
+	addrAttr ipAttr
+	src      netip.Addr
+	srcAttr  ipAttr
 }
 
-func (s *byRFC6724) Len() int { return len(s.addrs) }
+// compareByRFC6724 compares two byRFC6724Info records and returns an integer
+// indicating the order. It follows the algorithm and variable names from
+// RFC 6724 section 6. Returns -1 if a is preferred, 1 if b is preferred,
+// and 0 if they are equal.
+func compareByRFC6724(a, b byRFC6724Info) int {
+	DA := a.addr.IP
+	DB := b.addr.IP
+	SourceDA := a.src
+	SourceDB := b.src
+	attrDA := &a.addrAttr
+	attrDB := &b.addrAttr
+	attrSourceDA := &a.srcAttr
+	attrSourceDB := &b.srcAttr
 
-func (s *byRFC6724) Swap(i, j int) {
-	s.addrs[i], s.addrs[j] = s.addrs[j], s.addrs[i]
-	s.srcs[i], s.srcs[j] = s.srcs[j], s.srcs[i]
-	s.addrAttr[i], s.addrAttr[j] = s.addrAttr[j], s.addrAttr[i]
-	s.srcAttr[i], s.srcAttr[j] = s.srcAttr[j], s.srcAttr[i]
-}
-
-// Less reports whether i is a better destination address for this
-// host than j.
-//
-// The algorithm and variable names comes from RFC 6724 section 6.
-func (s *byRFC6724) Less(i, j int) bool {
-	DA := s.addrs[i].IP
-	DB := s.addrs[j].IP
-	SourceDA := s.srcs[i]
-	SourceDB := s.srcs[j]
-	attrDA := &s.addrAttr[i]
-	attrDB := &s.addrAttr[j]
-	attrSourceDA := &s.srcAttr[i]
-	attrSourceDB := &s.srcAttr[j]
-
-	const preferDA = true
-	const preferDB = false
+	const preferDA = -1
+	const preferDB = 1
 
 	// Rule 1: Avoid unusable destinations.
 	// If DB is known to be unreachable or if Source(DB) is undefined, then
 	// prefer DA.  Similarly, if DA is known to be unreachable or if
 	// Source(DA) is undefined, then prefer DB.
 	if !SourceDA.IsValid() && !SourceDB.IsValid() {
-		return false // "equal"
+		return 0 // "equal"
 	}
 	if !SourceDB.IsValid() {
 		return preferDA
@@ -212,7 +204,7 @@ func (s *byRFC6724) Less(i, j int) bool {
 	// Rule 10: Otherwise, leave the order unchanged.
 	// If DA preceded DB in the original list, prefer DA.
 	// Otherwise, prefer DB.
-	return false // "equal"
+	return 0 // "equal"
 }
 
 type policyTableEntry struct {
diff --git a/src/net/cgo_solaris.go b/src/net/cgo_solaris.go
index cde9c957..98a0e819 100644
--- a/src/net/cgo_solaris.go
+++ b/src/net/cgo_solaris.go
@@ -7,7 +7,7 @@
 package net
 
 /*
-#cgo LDFLAGS: -lsocket -lnsl -lsendfile
+#cgo LDFLAGS: -lsocket -lnsl
 #include 
 */
 import "C"
diff --git a/src/net/cgo_unix.go b/src/net/cgo_unix.go
index bc374c2c..e866150f 100644
--- a/src/net/cgo_unix.go
+++ b/src/net/cgo_unix.go
@@ -16,6 +16,7 @@ import (
 	"errors"
 	"internal/bytealg"
 	"net/netip"
+	"runtime"
 	"syscall"
 	"unsafe"
 
@@ -195,6 +196,16 @@ func cgoLookupHostIP(network, name string) (addrs []IPAddr, err error) {
 			return nil, newDNSError(err, name, "")
 		case _C_EAI_NONAME, _C_EAI_NODATA:
 			return nil, newDNSError(errNoSuchHost, name, "")
+		case _C_EAI_ADDRFAMILY:
+			if runtime.GOOS == "freebsd" {
+				// FreeBSD began returning EAI_ADDRFAMILY for valid hosts without
+				// an A record in 13.2. We previously returned "no such host" for
+				// this case.
+				//
+				// https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=273912
+				return nil, newDNSError(errNoSuchHost, name, "")
+			}
+			fallthrough
 		default:
 			return nil, newDNSError(addrinfoErrno(gerrno), name, "")
 		}
diff --git a/src/net/cgo_unix_cgo.go b/src/net/cgo_unix_cgo.go
index d38ae0a8..c4b8197c 100644
--- a/src/net/cgo_unix_cgo.go
+++ b/src/net/cgo_unix_cgo.go
@@ -22,6 +22,11 @@ package net
 #define EAI_NODATA -5
 #endif
 
+// If nothing else defined EAI_ADDRFAMILY, make sure it has a value.
+#ifndef EAI_ADDRFAMILY
+#define EAI_ADDRFAMILY -9
+#endif
+
 // If nothing else defined EAI_OVERFLOW, make sure it has a value.
 #ifndef EAI_OVERFLOW
 #define EAI_OVERFLOW -12
@@ -31,19 +36,20 @@ import "C"
 import "unsafe"
 
 const (
-	_C_AF_INET      = C.AF_INET
-	_C_AF_INET6     = C.AF_INET6
-	_C_AF_UNSPEC    = C.AF_UNSPEC
-	_C_EAI_AGAIN    = C.EAI_AGAIN
-	_C_EAI_NODATA   = C.EAI_NODATA
-	_C_EAI_NONAME   = C.EAI_NONAME
-	_C_EAI_SERVICE  = C.EAI_SERVICE
-	_C_EAI_OVERFLOW = C.EAI_OVERFLOW
-	_C_EAI_SYSTEM   = C.EAI_SYSTEM
-	_C_IPPROTO_TCP  = C.IPPROTO_TCP
-	_C_IPPROTO_UDP  = C.IPPROTO_UDP
-	_C_SOCK_DGRAM   = C.SOCK_DGRAM
-	_C_SOCK_STREAM  = C.SOCK_STREAM
+	_C_AF_INET        = C.AF_INET
+	_C_AF_INET6       = C.AF_INET6
+	_C_AF_UNSPEC      = C.AF_UNSPEC
+	_C_EAI_ADDRFAMILY = C.EAI_ADDRFAMILY
+	_C_EAI_AGAIN      = C.EAI_AGAIN
+	_C_EAI_NODATA     = C.EAI_NODATA
+	_C_EAI_NONAME     = C.EAI_NONAME
+	_C_EAI_SERVICE    = C.EAI_SERVICE
+	_C_EAI_OVERFLOW   = C.EAI_OVERFLOW
+	_C_EAI_SYSTEM     = C.EAI_SYSTEM
+	_C_IPPROTO_TCP    = C.IPPROTO_TCP
+	_C_IPPROTO_UDP    = C.IPPROTO_UDP
+	_C_SOCK_DGRAM     = C.SOCK_DGRAM
+	_C_SOCK_STREAM    = C.SOCK_STREAM
 )
 
 type (
diff --git a/src/net/cgo_unix_syscall.go b/src/net/cgo_unix_syscall.go
index 735dcdfe..9cfc5783 100644
--- a/src/net/cgo_unix_syscall.go
+++ b/src/net/cgo_unix_syscall.go
@@ -14,19 +14,20 @@ import (
 )
 
 const (
-	_C_AF_INET      = syscall.AF_INET
-	_C_AF_INET6     = syscall.AF_INET6
-	_C_AF_UNSPEC    = syscall.AF_UNSPEC
-	_C_EAI_AGAIN    = unix.EAI_AGAIN
-	_C_EAI_NONAME   = unix.EAI_NONAME
-	_C_EAI_SERVICE  = unix.EAI_SERVICE
-	_C_EAI_NODATA   = unix.EAI_NODATA
-	_C_EAI_OVERFLOW = unix.EAI_OVERFLOW
-	_C_EAI_SYSTEM   = unix.EAI_SYSTEM
-	_C_IPPROTO_TCP  = syscall.IPPROTO_TCP
-	_C_IPPROTO_UDP  = syscall.IPPROTO_UDP
-	_C_SOCK_DGRAM   = syscall.SOCK_DGRAM
-	_C_SOCK_STREAM  = syscall.SOCK_STREAM
+	_C_AF_INET        = syscall.AF_INET
+	_C_AF_INET6       = syscall.AF_INET6
+	_C_AF_UNSPEC      = syscall.AF_UNSPEC
+	_C_EAI_ADDRFAMILY = unix.EAI_ADDRFAMILY
+	_C_EAI_AGAIN      = unix.EAI_AGAIN
+	_C_EAI_NONAME     = unix.EAI_NONAME
+	_C_EAI_SERVICE    = unix.EAI_SERVICE
+	_C_EAI_NODATA     = unix.EAI_NODATA
+	_C_EAI_OVERFLOW   = unix.EAI_OVERFLOW
+	_C_EAI_SYSTEM     = unix.EAI_SYSTEM
+	_C_IPPROTO_TCP    = syscall.IPPROTO_TCP
+	_C_IPPROTO_UDP    = syscall.IPPROTO_UDP
+	_C_SOCK_DGRAM     = syscall.SOCK_DGRAM
+	_C_SOCK_STREAM    = syscall.SOCK_STREAM
 )
 
 type (
diff --git a/src/net/conf.go b/src/net/conf.go
index 358f5434..92c5618d 100644
--- a/src/net/conf.go
+++ b/src/net/conf.go
@@ -13,7 +13,6 @@ import (
 	"os"
 	"runtime"
 	"sync"
-	"syscall"
 )
 
 // The net package's name resolution is rather complicated.
@@ -94,19 +93,30 @@ func initConfVal() {
 			if confVal.dnsDebugLevel > 1 {
 				println("go package net: confVal.netCgo =", confVal.netCgo, " netGo =", confVal.netGo)
 			}
+			if dnsMode != "go" && dnsMode != "cgo" && dnsMode != "" {
+				println("go package net: GODEBUG=netdns contains an invalid dns mode, ignoring it")
+			}
 			switch {
-			case confVal.netGo:
-				if netGoBuildTag {
-					println("go package net: built with netgo build tag; using Go's DNS resolver")
+			case netGoBuildTag || !cgoAvailable:
+				if dnsMode == "cgo" {
+					println("go package net: ignoring GODEBUG=netdns=cgo as the binary was compiled without support for the cgo resolver")
 				} else {
-					println("go package net: GODEBUG setting forcing use of Go's resolver")
+					println("go package net: using the Go DNS resolver")
+				}
+			case netCgoBuildTag:
+				if dnsMode == "go" {
+					println("go package net: GODEBUG setting forcing use of the Go resolver")
+				} else {
+					println("go package net: using the cgo DNS resolver")
 				}
-			case !cgoAvailable:
-				println("go package net: cgo resolver not supported; using Go's DNS resolver")
-			case confVal.netCgo || confVal.preferCgo:
-				println("go package net: using cgo DNS resolver")
 			default:
-				println("go package net: dynamic selection of DNS resolver")
+				if dnsMode == "go" {
+					println("go package net: GODEBUG setting forcing use of the Go resolver")
+				} else if dnsMode == "cgo" {
+					println("go package net: GODEBUG setting forcing use of the cgo resolver")
+				} else {
+					println("go package net: dynamic selection of DNS resolver")
+				}
 			}
 		}()
 	}
@@ -138,7 +148,7 @@ func initConfVal() {
 	// prefer the cgo resolver.
 	// Note that LOCALDOMAIN can change behavior merely by being
 	// specified with the empty string.
-	_, localDomainDefined := syscall.Getenv("LOCALDOMAIN")
+	_, localDomainDefined := os.LookupEnv("LOCALDOMAIN")
 	if localDomainDefined || os.Getenv("RES_OPTIONS") != "" || os.Getenv("HOSTALIASES") != "" {
 		confVal.preferCgo = true
 		return
diff --git a/src/net/dial.go b/src/net/dial.go
index 28f346a3..db0404c3 100644
--- a/src/net/dial.go
+++ b/src/net/dial.go
@@ -25,46 +25,93 @@ const (
 	// defaultTCPKeepAliveCount is a default constant value for TCP_KEEPCNT.
 	defaultTCPKeepAliveCount = 9
 
-	// For the moment, MultiPath TCP is not used by default
+	// For the moment, MultiPath TCP is used by default with listeners, if
+	// available, but not with dialers.
 	// See go.dev/issue/56539
-	defaultMPTCPEnabled = false
+	defaultMPTCPEnabledListen = true
+	defaultMPTCPEnabledDial   = false
 )
 
+// The type of service offered
+//
+//	0 == MPTCP disabled
+//	1 == MPTCP enabled
+//	2 == MPTCP enabled on listeners only
+//	3 == MPTCP enabled on dialers only
 var multipathtcp = godebug.New("multipathtcp")
 
-// mptcpStatus is a tristate for Multipath TCP, see go.dev/issue/56539
-type mptcpStatus uint8
+// mptcpStatusDial is a tristate for Multipath TCP on clients,
+// see go.dev/issue/56539
+type mptcpStatusDial uint8
 
 const (
-	// The value 0 is the system default, linked to defaultMPTCPEnabled
-	mptcpUseDefault mptcpStatus = iota
-	mptcpEnabled
-	mptcpDisabled
+	// The value 0 is the system default, linked to defaultMPTCPEnabledDial
+	mptcpUseDefaultDial mptcpStatusDial = iota
+	mptcpEnabledDial
+	mptcpDisabledDial
 )
 
-func (m *mptcpStatus) get() bool {
+func (m *mptcpStatusDial) get() bool {
 	switch *m {
-	case mptcpEnabled:
+	case mptcpEnabledDial:
 		return true
-	case mptcpDisabled:
+	case mptcpDisabledDial:
 		return false
 	}
 
 	// If MPTCP is forced via GODEBUG=multipathtcp=1
-	if multipathtcp.Value() == "1" {
+	if multipathtcp.Value() == "1" || multipathtcp.Value() == "3" {
 		multipathtcp.IncNonDefault()
 
 		return true
 	}
 
-	return defaultMPTCPEnabled
+	return defaultMPTCPEnabledDial
 }
 
-func (m *mptcpStatus) set(use bool) {
+func (m *mptcpStatusDial) set(use bool) {
 	if use {
-		*m = mptcpEnabled
+		*m = mptcpEnabledDial
 	} else {
-		*m = mptcpDisabled
+		*m = mptcpDisabledDial
+	}
+}
+
+// mptcpStatusListen is a tristate for Multipath TCP on servers,
+// see go.dev/issue/56539
+type mptcpStatusListen uint8
+
+const (
+	// The value 0 is the system default, linked to defaultMPTCPEnabledListen
+	mptcpUseDefaultListen mptcpStatusListen = iota
+	mptcpEnabledListen
+	mptcpDisabledListen
+)
+
+func (m *mptcpStatusListen) get() bool {
+	switch *m {
+	case mptcpEnabledListen:
+		return true
+	case mptcpDisabledListen:
+		return false
+	}
+
+	// If MPTCP is disabled via GODEBUG=multipathtcp=0 or only
+	// enabled on dialers, but not on listeners.
+	if multipathtcp.Value() == "0" || multipathtcp.Value() == "3" {
+		multipathtcp.IncNonDefault()
+
+		return false
+	}
+
+	return defaultMPTCPEnabledListen
+}
+
+func (m *mptcpStatusListen) set(use bool) {
+	if use {
+		*m = mptcpEnabledListen
+	} else {
+		*m = mptcpDisabledListen
 	}
 }
 
@@ -156,8 +203,10 @@ type Dialer struct {
 	// connection but before actually dialing.
 	//
 	// Network and address parameters passed to Control function are not
-	// necessarily the ones passed to Dial. For example, passing "tcp" to Dial
-	// will cause the Control function to be called with "tcp4" or "tcp6".
+	// necessarily the ones passed to Dial. Calling Dial with TCP networks
+	// will cause the Control function to be called with "tcp4" or "tcp6",
+	// UDP networks become "udp4" or "udp6", IP networks become "ip4" or "ip6",
+	// and other known networks are passed as-is.
 	//
 	// Control is ignored if ControlContext is not nil.
 	Control func(network, address string, c syscall.RawConn) error
@@ -166,8 +215,10 @@ type Dialer struct {
 	// connection but before actually dialing.
 	//
 	// Network and address parameters passed to ControlContext function are not
-	// necessarily the ones passed to Dial. For example, passing "tcp" to Dial
-	// will cause the ControlContext function to be called with "tcp4" or "tcp6".
+	// necessarily the ones passed to Dial. Calling Dial with TCP networks
+	// will cause the ControlContext function to be called with "tcp4" or "tcp6",
+	// UDP networks become "udp4" or "udp6", IP networks become "ip4" or "ip6",
+	// and other known networks are passed as-is.
 	//
 	// If ControlContext is not nil, Control is ignored.
 	ControlContext func(ctx context.Context, network, address string, c syscall.RawConn) error
@@ -175,7 +226,7 @@ type Dialer struct {
 	// If mptcpStatus is set to a value allowing Multipath TCP (MPTCP) to be
 	// used, any call to Dial with "tcp(4|6)" as network will use MPTCP if
 	// supported by the operating system.
-	mptcpStatus mptcpStatus
+	mptcpStatus mptcpStatusDial
 }
 
 func (d *Dialer) dualStack() bool { return d.FallbackDelay >= 0 }
@@ -692,9 +743,11 @@ type ListenConfig struct {
 	// If Control is not nil, it is called after creating the network
 	// connection but before binding it to the operating system.
 	//
-	// Network and address parameters passed to Control method are not
-	// necessarily the ones passed to Listen. For example, passing "tcp" to
-	// Listen will cause the Control function to be called with "tcp4" or "tcp6".
+	// Network and address parameters passed to Control function are not
+	// necessarily the ones passed to Listen. Calling Listen with TCP networks
+	// will cause the Control function to be called with "tcp4" or "tcp6",
+	// UDP networks become "udp4" or "udp6", IP networks become "ip4" or "ip6",
+	// and other known networks are passed as-is.
 	Control func(network, address string, c syscall.RawConn) error
 
 	// KeepAlive specifies the keep-alive period for network
@@ -720,7 +773,7 @@ type ListenConfig struct {
 	// If mptcpStatus is set to a value allowing Multipath TCP (MPTCP) to be
 	// used, any call to Listen with "tcp(4|6)" as network will use MPTCP if
 	// supported by the operating system.
-	mptcpStatus mptcpStatus
+	mptcpStatus mptcpStatusListen
 }
 
 // MultipathTCP reports whether MPTCP will be used.
@@ -745,6 +798,9 @@ func (lc *ListenConfig) SetMultipathTCP(use bool) {
 //
 // See func Listen for a description of the network and address
 // parameters.
+//
+// The ctx argument is used while resolving the address on which to listen;
+// it does not affect the returned Listener.
 func (lc *ListenConfig) Listen(ctx context.Context, network, address string) (Listener, error) {
 	addrs, err := DefaultResolver.resolveAddrList(ctx, "listen", network, address, nil)
 	if err != nil {
@@ -779,6 +835,9 @@ func (lc *ListenConfig) Listen(ctx context.Context, network, address string) (Li
 //
 // See func ListenPacket for a description of the network and address
 // parameters.
+//
+// The ctx argument is used while resolving the address on which to listen;
+// it does not affect the returned Listener.
 func (lc *ListenConfig) ListenPacket(ctx context.Context, network, address string) (PacketConn, error) {
 	addrs, err := DefaultResolver.resolveAddrList(ctx, "listen", network, address, nil)
 	if err != nil {
diff --git a/src/net/dnsclient_unix.go b/src/net/dnsclient_unix.go
index 54c7dc83..5e060a6b 100644
--- a/src/net/dnsclient_unix.go
+++ b/src/net/dnsclient_unix.go
@@ -18,6 +18,7 @@ import (
 	"internal/bytealg"
 	"internal/godebug"
 	"internal/itoa"
+	"internal/stringslite"
 	"io"
 	"os"
 	"runtime"
@@ -487,9 +488,7 @@ func avoidDNS(name string) bool {
 	if name == "" {
 		return true
 	}
-	if name[len(name)-1] == '.' {
-		name = name[:len(name)-1]
-	}
+	name = stringslite.TrimSuffix(name, ".")
 	return stringsHasSuffixFold(name, ".onion")
 }
 
diff --git a/src/net/dnsclient_unix_test.go b/src/net/dnsclient_unix_test.go
index 31677573..c4e5194a 100644
--- a/src/net/dnsclient_unix_test.go
+++ b/src/net/dnsclient_unix_test.go
@@ -10,6 +10,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"maps"
 	"os"
 	"path"
 	"path/filepath"
@@ -429,7 +430,7 @@ func TestUpdateResolvConf(t *testing.T) {
 			wg.Wait()
 		}
 		servers := conf.servers()
-		if !reflect.DeepEqual(servers, tt.servers) {
+		if !slices.Equal(servers, tt.servers) {
 			t.Errorf("#%d: got %v; want %v", i, servers, tt.servers)
 			continue
 		}
@@ -1154,7 +1155,7 @@ func testRotate(t *testing.T, rotate bool, nameservers, wantServers []string) {
 		}
 	}
 
-	if !reflect.DeepEqual(usedServers, wantServers) {
+	if !slices.Equal(usedServers, wantServers) {
 		t.Errorf("rotate=%t got used servers:\n%v\nwant:\n%v", rotate, usedServers, wantServers)
 	}
 }
@@ -1433,7 +1434,7 @@ func TestStrictErrorsLookupIP(t *testing.T) {
 					wantIPs[ip] = struct{}{}
 				}
 			}
-			if !reflect.DeepEqual(gotIPs, wantIPs) {
+			if !maps.Equal(gotIPs, wantIPs) {
 				t.Errorf("#%d (%s) strict=%v: got ips %v; want %v", i, tt.desc, strict, gotIPs, wantIPs)
 			}
 		}
@@ -1940,7 +1941,7 @@ func TestPTRandNonPTR(t *testing.T) {
 	if err != nil {
 		t.Fatalf("LookupAddr: %v", err)
 	}
-	if want := []string{"golang.org."}; !reflect.DeepEqual(names, want) {
+	if want := []string{"golang.org."}; !slices.Equal(names, want) {
 		t.Errorf("names = %q; want %q", names, want)
 	}
 }
@@ -2207,14 +2208,14 @@ func TestCVE202133195(t *testing.T) {
 				if err.Error() != expectedErr.Error() {
 					t.Fatalf("unexpected error: %s", err)
 				}
-				if !reflect.DeepEqual(records, expected) {
+				if !slices.Equal(records, expected) {
 					t.Error("Unexpected record set")
 				}
 				records, err = LookupAddr("192.0.2.42")
 				if err.Error() != expectedErr.Error() {
 					t.Fatalf("unexpected error: %s", err)
 				}
-				if !reflect.DeepEqual(records, expected) {
+				if !slices.Equal(records, expected) {
 					t.Error("Unexpected record set")
 				}
 			},
diff --git a/src/net/dnsconfig_unix_test.go b/src/net/dnsconfig_unix_test.go
index 0aae2ba8..4db1c5a4 100644
--- a/src/net/dnsconfig_unix_test.go
+++ b/src/net/dnsconfig_unix_test.go
@@ -11,6 +11,7 @@ import (
 	"io/fs"
 	"os"
 	"reflect"
+	"slices"
 	"strings"
 	"testing"
 	"time"
@@ -250,7 +251,7 @@ func TestDNSDefaultSearch(t *testing.T) {
 	for _, tt := range dnsDefaultSearchTests {
 		getHostname = func() (string, error) { return tt.name, tt.err }
 		got := dnsDefaultSearch()
-		if !reflect.DeepEqual(got, tt.want) {
+		if !slices.Equal(got, tt.want) {
 			t.Errorf("dnsDefaultSearch with hostname %q and error %+v = %q, wanted %q", tt.name, tt.err, got, tt.want)
 		}
 	}
diff --git a/src/net/example_test.go b/src/net/example_test.go
index 2c045d73..12c83970 100644
--- a/src/net/example_test.go
+++ b/src/net/example_test.go
@@ -334,7 +334,7 @@ func ExampleIP_To16() {
 	// 10.255.0.0
 }
 
-func ExampleIP_to4() {
+func ExampleIP_To4() {
 	ipv6 := net.IP{0xfc, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
 	ipv4 := net.IPv4(10, 255, 0, 0)
 
diff --git a/src/net/hosts_test.go b/src/net/hosts_test.go
index 5f229207..2661e79d 100644
--- a/src/net/hosts_test.go
+++ b/src/net/hosts_test.go
@@ -5,7 +5,7 @@
 package net
 
 import (
-	"reflect"
+	"slices"
 	"strings"
 	"testing"
 )
@@ -73,7 +73,7 @@ func testStaticHost(t *testing.T, hostsPath string, ent staticHostEntry) {
 	ins := []string{ent.in, absDomainName(ent.in), strings.ToLower(ent.in), strings.ToUpper(ent.in)}
 	for _, in := range ins {
 		addrs, _ := lookupStaticHost(in)
-		if !reflect.DeepEqual(addrs, ent.out) {
+		if !slices.Equal(addrs, ent.out) {
 			t.Errorf("%s, lookupStaticHost(%s) = %v; want %v", hostsPath, in, addrs, ent.out)
 		}
 	}
@@ -143,7 +143,7 @@ func testStaticAddr(t *testing.T, hostsPath string, ent staticHostEntry) {
 	for i := range ent.out {
 		ent.out[i] = absDomainName(ent.out[i])
 	}
-	if !reflect.DeepEqual(hosts, ent.out) {
+	if !slices.Equal(hosts, ent.out) {
 		t.Errorf("%s, lookupStaticAddr(%s) = %v; want %v", hostsPath, ent.in, hosts, ent.out)
 	}
 }
diff --git a/src/net/http/async_test.go b/src/net/http/async_test.go
new file mode 100644
index 00000000..545cbcf5
--- /dev/null
+++ b/src/net/http/async_test.go
@@ -0,0 +1,52 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package http_test
+
+import (
+	"errors"
+	"internal/synctest"
+)
+
+var errStillRunning = errors.New("async op still running")
+
+type asyncResult[T any] struct {
+	donec chan struct{}
+	res   T
+	err   error
+}
+
+// runAsync runs f in a new goroutine.
+// It returns an asyncResult which acts as a future.
+//
+// Must be called from within a synctest bubble.
+func runAsync[T any](f func() (T, error)) *asyncResult[T] {
+	r := &asyncResult[T]{
+		donec: make(chan struct{}),
+	}
+	go func() {
+		defer close(r.donec)
+		r.res, r.err = f()
+	}()
+	synctest.Wait()
+	return r
+}
+
+// done reports whether the function has returned.
+func (r *asyncResult[T]) done() bool {
+	_, err := r.result()
+	return err != errStillRunning
+}
+
+// result returns the result of the function.
+// If the function hasn't completed yet, it returns errStillRunning.
+func (r *asyncResult[T]) result() (T, error) {
+	select {
+	case <-r.donec:
+		return r.res, r.err
+	default:
+		var zero T
+		return zero, errStillRunning
+	}
+}
diff --git a/src/net/http/cgi/cgi_main.go b/src/net/http/cgi/cgi_main.go
index 033036d0..1435f1b7 100644
--- a/src/net/http/cgi/cgi_main.go
+++ b/src/net/http/cgi/cgi_main.go
@@ -7,6 +7,7 @@ package cgi
 import (
 	"fmt"
 	"io"
+	"maps"
 	"net/http"
 	"os"
 	"path"
@@ -63,22 +64,12 @@ func testCGI() {
 
 	fmt.Printf("test=Hello CGI\r\n")
 
-	keys := make([]string, 0, len(params))
-	for k := range params {
-		keys = append(keys, k)
-	}
-	slices.Sort(keys)
-	for _, key := range keys {
+	for _, key := range slices.Sorted(maps.Keys(params)) {
 		fmt.Printf("param-%s=%s\r\n", key, params.Get(key))
 	}
 
 	envs := envMap(os.Environ())
-	keys = make([]string, 0, len(envs))
-	for k := range envs {
-		keys = append(keys, k)
-	}
-	slices.Sort(keys)
-	for _, key := range keys {
+	for _, key := range slices.Sorted(maps.Keys(envs)) {
 		fmt.Printf("env-%s=%s\r\n", key, envs[key])
 	}
 
diff --git a/src/net/http/cgi/host_test.go b/src/net/http/cgi/host_test.go
index 7fe0e625..8ecfa19f 100644
--- a/src/net/http/cgi/host_test.go
+++ b/src/net/http/cgi/host_test.go
@@ -16,9 +16,9 @@ import (
 	"net/http/httptest"
 	"os"
 	"path/filepath"
-	"reflect"
 	"regexp"
 	"runtime"
+	"slices"
 	"strings"
 	"testing"
 	"time"
@@ -510,7 +510,7 @@ func TestRemoveLeadingDuplicates(t *testing.T) {
 	}
 	for _, tt := range tests {
 		got := removeLeadingDuplicates(tt.env)
-		if !reflect.DeepEqual(got, tt.want) {
+		if !slices.Equal(got, tt.want) {
 			t.Errorf("removeLeadingDuplicates(%q) = %q; want %q", tt.env, got, tt.want)
 		}
 	}
diff --git a/src/net/http/client.go b/src/net/http/client.go
index f8892c2b..9231f63e 100644
--- a/src/net/http/client.go
+++ b/src/net/http/client.go
@@ -388,15 +388,12 @@ func setRequestCancel(req *Request, rt RoundTripper, deadline time.Time) (stopTi
 	}
 
 	stopTimerCh := make(chan struct{})
-	var once sync.Once
-	stopTimer = func() {
-		once.Do(func() {
-			close(stopTimerCh)
-			if cancelCtx != nil {
-				cancelCtx()
-			}
-		})
-	}
+	stopTimer = sync.OnceFunc(func() {
+		close(stopTimerCh)
+		if cancelCtx != nil {
+			cancelCtx()
+		}
+	})
 
 	timer := time.NewTimer(time.Until(deadline))
 	var timedOut atomic.Bool
@@ -737,11 +734,16 @@ func (c *Client) do(req *Request) (retres *Response, reterr error) {
 			return nil, uerr(err)
 		}
 
-		var shouldRedirect bool
-		redirectMethod, shouldRedirect, includeBody = redirectBehavior(req.Method, resp, reqs[0])
+		var shouldRedirect, includeBodyOnHop bool
+		redirectMethod, shouldRedirect, includeBodyOnHop = redirectBehavior(req.Method, resp, reqs[0])
 		if !shouldRedirect {
 			return resp, nil
 		}
+		if !includeBodyOnHop {
+			// Once a hop drops the body, we never send it again
+			// (because we're now handling a redirect for a request with no body).
+			includeBody = false
+		}
 
 		req.closeBody()
 	}
diff --git a/src/net/http/client_test.go b/src/net/http/client_test.go
index d57096fc..1ce95395 100644
--- a/src/net/http/client_test.go
+++ b/src/net/http/client_test.go
@@ -346,7 +346,7 @@ func TestPostRedirects(t *testing.T) {
 		`POST /?code=307&next=303,308,302 "c307"`,
 		`POST /?code=303&next=308,302 "c307"`,
 		`GET /?code=308&next=302 ""`,
-		`GET /?code=302 "c307"`,
+		`GET /?code=302 ""`,
 		`GET / ""`,
 		`POST /?code=308&next=302,301 "c308"`,
 		`POST /?code=302&next=301 "c308"`,
@@ -376,7 +376,7 @@ func TestDeleteRedirects(t *testing.T) {
 		`DELETE /?code=301&next=302,308 "c301"`,
 		`GET /?code=302&next=308 ""`,
 		`GET /?code=308 ""`,
-		`GET / "c301"`,
+		`GET / ""`,
 		`DELETE /?code=302&next=302 "c302"`,
 		`GET /?code=302 ""`,
 		`GET / ""`,
@@ -385,7 +385,7 @@ func TestDeleteRedirects(t *testing.T) {
 		`DELETE /?code=307&next=301,308,303,302,304 "c307"`,
 		`DELETE /?code=301&next=308,303,302,304 "c307"`,
 		`GET /?code=308&next=303,302,304 ""`,
-		`GET /?code=303&next=302,304 "c307"`,
+		`GET /?code=303&next=302,304 ""`,
 		`GET /?code=302&next=304 ""`,
 		`GET /?code=304 ""`,
 		`DELETE /?code=308&next=307 "c308"`,
@@ -751,7 +751,7 @@ func testStreamingGet(t *testing.T, mode testMode) {
 	var buf [10]byte
 	for _, str := range []string{"i", "am", "also", "known", "as", "comet"} {
 		say <- str
-		n, err := io.ReadFull(res.Body, buf[0:len(str)])
+		n, err := io.ReadFull(res.Body, buf[:len(str)])
 		if err != nil {
 			t.Fatalf("ReadFull on %q: %v", str, err)
 		}
diff --git a/src/net/http/clientserver_test.go b/src/net/http/clientserver_test.go
index 3dc440dd..32d97ea9 100644
--- a/src/net/http/clientserver_test.go
+++ b/src/net/http/clientserver_test.go
@@ -15,8 +15,10 @@ import (
 	"crypto/tls"
 	"fmt"
 	"hash"
+	"internal/synctest"
 	"io"
 	"log"
+	"maps"
 	"net"
 	. "net/http"
 	"net/http/httptest"
@@ -38,9 +40,10 @@ import (
 type testMode string
 
 const (
-	http1Mode  = testMode("h1")     // HTTP/1.1
-	https1Mode = testMode("https1") // HTTPS/1.1
-	http2Mode  = testMode("h2")     // HTTP/2
+	http1Mode            = testMode("h1")            // HTTP/1.1
+	https1Mode           = testMode("https1")        // HTTPS/1.1
+	http2Mode            = testMode("h2")            // HTTP/2
+	http2UnencryptedMode = testMode("h2unencrypted") // HTTP/2
 )
 
 type testNotParallelOpt struct{}
@@ -92,6 +95,37 @@ func run[T TBRun[T]](t T, f func(t T, mode testMode), opts ...any) {
 	}
 }
 
+// cleanupT wraps a testing.T and adds its own Cleanup method.
+// Used to execute cleanup functions within a synctest bubble.
+type cleanupT struct {
+	*testing.T
+	cleanups []func()
+}
+
+// Cleanup replaces T.Cleanup.
+func (t *cleanupT) Cleanup(f func()) {
+	t.cleanups = append(t.cleanups, f)
+}
+
+func (t *cleanupT) done() {
+	for _, f := range slices.Backward(t.cleanups) {
+		f()
+	}
+}
+
+// runSynctest is run combined with synctest.Run.
+//
+// The TB passed to f arranges for cleanup functions to be run in the synctest bubble.
+func runSynctest(t *testing.T, f func(t testing.TB, mode testMode), opts ...any) {
+	run(t, func(t *testing.T, mode testMode) {
+		synctest.Run(func() {
+			ct := &cleanupT{T: t}
+			defer ct.done()
+			f(ct, mode)
+		})
+	}, opts...)
+}
+
 type clientServerTest struct {
 	t  testing.TB
 	h2 bool
@@ -99,6 +133,7 @@ type clientServerTest struct {
 	ts *httptest.Server
 	tr *Transport
 	c  *Client
+	li *fakeNetListener
 }
 
 func (t *clientServerTest) close() {
@@ -136,6 +171,8 @@ func optWithServerLog(lg *log.Logger) func(*httptest.Server) {
 	}
 }
 
+var optFakeNet = new(struct{})
+
 // newClientServerTest creates and starts an httptest.Server.
 //
 // The mode parameter selects the implementation to test:
@@ -147,6 +184,9 @@ func optWithServerLog(lg *log.Logger) func(*httptest.Server) {
 //
 //	func(*httptest.Server) // run before starting the server
 //	func(*http.Transport)
+//
+// The optFakeNet option configures the server and client to use a fake network implementation,
+// suitable for use in testing/synctest tests.
 func newClientServerTest(t testing.TB, mode testMode, h Handler, opts ...any) *clientServerTest {
 	if mode == http2Mode {
 		CondSkipHTTP2(t)
@@ -156,9 +196,31 @@ func newClientServerTest(t testing.TB, mode testMode, h Handler, opts ...any) *c
 		h2: mode == http2Mode,
 		h:  h,
 	}
-	cst.ts = httptest.NewUnstartedServer(h)
 
 	var transportFuncs []func(*Transport)
+
+	if idx := slices.Index(opts, any(optFakeNet)); idx >= 0 {
+		opts = slices.Delete(opts, idx, idx+1)
+		cst.li = fakeNetListen()
+		cst.ts = &httptest.Server{
+			Config:   &Server{Handler: h},
+			Listener: cst.li,
+		}
+		transportFuncs = append(transportFuncs, func(tr *Transport) {
+			tr.DialContext = func(ctx context.Context, network, addr string) (net.Conn, error) {
+				return cst.li.connect(), nil
+			}
+		})
+	} else {
+		cst.ts = httptest.NewUnstartedServer(h)
+	}
+
+	if mode == http2UnencryptedMode {
+		p := &Protocols{}
+		p.SetUnencryptedHTTP2(true)
+		cst.ts.Config.Protocols = p
+	}
+
 	for _, opt := range opts {
 		switch opt := opt.(type) {
 		case func(*Transport):
@@ -179,6 +241,9 @@ func newClientServerTest(t testing.TB, mode testMode, h Handler, opts ...any) *c
 		cst.ts.Start()
 	case https1Mode:
 		cst.ts.StartTLS()
+	case http2UnencryptedMode:
+		ExportHttp2ConfigureServer(cst.ts.Config, nil)
+		cst.ts.Start()
 	case http2Mode:
 		ExportHttp2ConfigureServer(cst.ts.Config, nil)
 		cst.ts.TLS = cst.ts.Config.TLSConfig
@@ -188,7 +253,7 @@ func newClientServerTest(t testing.TB, mode testMode, h Handler, opts ...any) *c
 	}
 	cst.c = cst.ts.Client()
 	cst.tr = cst.c.Transport.(*Transport)
-	if mode == http2Mode {
+	if mode == http2Mode || mode == http2UnencryptedMode {
 		if err := ExportHttp2ConfigureTransport(cst.tr); err != nil {
 			t.Fatal(err)
 		}
@@ -196,6 +261,13 @@ func newClientServerTest(t testing.TB, mode testMode, h Handler, opts ...any) *c
 	for _, f := range transportFuncs {
 		f(cst.tr)
 	}
+
+	if mode == http2UnencryptedMode {
+		p := &Protocols{}
+		p.SetUnencryptedHTTP2(true)
+		cst.tr.Protocols = p
+	}
+
 	t.Cleanup(func() {
 		cst.close()
 	})
@@ -213,9 +285,19 @@ func (w testLogWriter) Write(b []byte) (int, error) {
 
 // Testing the newClientServerTest helper itself.
 func TestNewClientServerTest(t *testing.T) {
-	run(t, testNewClientServerTest, []testMode{http1Mode, https1Mode, http2Mode})
+	modes := []testMode{http1Mode, https1Mode, http2Mode}
+	t.Run("realnet", func(t *testing.T) {
+		run(t, func(t *testing.T, mode testMode) {
+			testNewClientServerTest(t, mode)
+		}, modes)
+	})
+	t.Run("synctest", func(t *testing.T) {
+		runSynctest(t, func(t testing.TB, mode testMode) {
+			testNewClientServerTest(t, mode, optFakeNet)
+		}, modes)
+	})
 }
-func testNewClientServerTest(t *testing.T, mode testMode) {
+func testNewClientServerTest(t testing.TB, mode testMode, opts ...any) {
 	var got struct {
 		sync.Mutex
 		proto  string
@@ -227,7 +309,7 @@ func testNewClientServerTest(t *testing.T, mode testMode) {
 		got.proto = r.Proto
 		got.hasTLS = r.TLS != nil
 	})
-	cst := newClientServerTest(t, mode, h)
+	cst := newClientServerTest(t, mode, h, opts...)
 	if _, err := cst.c.Head(cst.ts.URL); err != nil {
 		t.Fatal(err)
 	}
@@ -274,7 +356,7 @@ func testChunkedResponseHeaders(t *testing.T, mode testMode) {
 	if mode == http2Mode {
 		wantTE = nil
 	}
-	if !reflect.DeepEqual(res.TransferEncoding, wantTE) {
+	if !slices.Equal(res.TransferEncoding, wantTE) {
 		t.Errorf("TransferEncoding = %v; want %v", res.TransferEncoding, wantTE)
 	}
 	if got, haveCL := res.Header["Content-Length"]; haveCL {
@@ -689,12 +771,6 @@ func testCancelRequestMidBody(t *testing.T, mode testMode) {
 func TestTrailersClientToServer(t *testing.T) { run(t, testTrailersClientToServer) }
 func testTrailersClientToServer(t *testing.T, mode testMode) {
 	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
-		var decl []string
-		for k := range r.Trailer {
-			decl = append(decl, k)
-		}
-		slices.Sort(decl)
-
 		slurp, err := io.ReadAll(r.Body)
 		if err != nil {
 			t.Errorf("Server reading request body: %v", err)
@@ -705,6 +781,7 @@ func testTrailersClientToServer(t *testing.T, mode testMode) {
 		if r.Trailer == nil {
 			io.WriteString(w, "nil Trailer")
 		} else {
+			decl := slices.Sorted(maps.Keys(r.Trailer))
 			fmt.Fprintf(w, "decl: %v, vals: %s, %s",
 				decl,
 				r.Trailer.Get("Client-Trailer-A"),
@@ -1602,6 +1679,7 @@ func testBidiStreamReverseProxy(t *testing.T, mode testMode) {
 		_, err := io.CopyN(io.MultiWriter(h, pw), rand.Reader, size)
 		go pw.Close()
 		if err != nil {
+			t.Errorf("body copy: %v", err)
 			bodyRes <- err
 		} else {
 			bodyRes <- h
diff --git a/src/net/http/cookiejar/jar.go b/src/net/http/cookiejar/jar.go
index 2eec1a3e..edf14d03 100644
--- a/src/net/http/cookiejar/jar.go
+++ b/src/net/http/cookiejar/jar.go
@@ -500,9 +500,7 @@ func (j *Jar) domainAndType(host, domain string) (string, bool, error) {
 	// From here on: If the cookie is valid, it is a domain cookie (with
 	// the one exception of a public suffix below).
 	// See RFC 6265 section 5.2.3.
-	if domain[0] == '.' {
-		domain = domain[1:]
-	}
+	domain = strings.TrimPrefix(domain, ".")
 
 	if len(domain) == 0 || domain[0] == '.' {
 		// Received either "Domain=." or "Domain=..some.thing",
diff --git a/src/net/http/example_filesystem_test.go b/src/net/http/example_filesystem_test.go
index 0e81458a..ebcb994f 100644
--- a/src/net/http/example_filesystem_test.go
+++ b/src/net/http/example_filesystem_test.go
@@ -5,6 +5,7 @@
 package http_test
 
 import (
+	"io"
 	"io/fs"
 	"log"
 	"net/http"
@@ -40,6 +41,9 @@ func (f dotFileHidingFile) Readdir(n int) (fis []fs.FileInfo, err error) {
 			fis = append(fis, file)
 		}
 	}
+	if err == nil && n > 0 && len(fis) == 0 {
+		err = io.EOF
+	}
 	return
 }
 
diff --git a/src/net/http/example_test.go b/src/net/http/example_test.go
index 2f411d1d..f40273f1 100644
--- a/src/net/http/example_test.go
+++ b/src/net/http/example_test.go
@@ -193,3 +193,31 @@ func ExampleNotFoundHandler() {
 
 	log.Fatal(http.ListenAndServe(":8080", mux))
 }
+
+func ExampleProtocols_http1() {
+	srv := http.Server{
+		Addr: ":8443",
+	}
+
+	// Serve only HTTP/1.
+	srv.Protocols = new(http.Protocols)
+	srv.Protocols.SetHTTP1(true)
+
+	log.Fatal(srv.ListenAndServeTLS("cert.pem", "key.pem"))
+}
+
+func ExampleProtocols_http1or2() {
+	t := http.DefaultTransport.(*http.Transport).Clone()
+
+	// Use either HTTP/1 and HTTP/2.
+	t.Protocols = new(http.Protocols)
+	t.Protocols.SetHTTP1(true)
+	t.Protocols.SetHTTP2(true)
+
+	cli := &http.Client{Transport: t}
+	res, err := cli.Get("http://www.google.com/robots.txt")
+	if err != nil {
+		log.Fatal(err)
+	}
+	res.Body.Close()
+}
diff --git a/src/net/http/fs_test.go b/src/net/http/fs_test.go
index 2ffffbf0..3149ca35 100644
--- a/src/net/http/fs_test.go
+++ b/src/net/http/fs_test.go
@@ -24,9 +24,9 @@ import (
 	"os/exec"
 	"path"
 	"path/filepath"
-	"reflect"
 	"regexp"
 	"runtime"
+	"slices"
 	"strconv"
 	"strings"
 	"testing"
@@ -516,7 +516,7 @@ func testServeFileContentType(t *testing.T, mode testMode) {
 		if err != nil {
 			t.Fatal(err)
 		}
-		if h := resp.Header["Content-Type"]; !reflect.DeepEqual(h, want) {
+		if h := resp.Header["Content-Type"]; !slices.Equal(h, want) {
 			t.Errorf("Content-Type mismatch: got %v, want %v", h, want)
 		}
 		resp.Body.Close()
@@ -1448,7 +1448,7 @@ func TestFileServerCleanPath(t *testing.T) {
 		rr := httptest.NewRecorder()
 		req, _ := NewRequest("GET", "http://foo.localhost"+tt.path, nil)
 		FileServer(fileServerCleanPathDir{&log}).ServeHTTP(rr, req)
-		if !reflect.DeepEqual(log, tt.wantOpen) {
+		if !slices.Equal(log, tt.wantOpen) {
 			t.Logf("For %s: Opens = %q; want %q", tt.path, log, tt.wantOpen)
 		}
 		if rr.Code != tt.wantCode {
diff --git a/src/net/http/h2_bundle.go b/src/net/http/h2_bundle.go
index 0b305844..22f013f1 100644
--- a/src/net/http/h2_bundle.go
+++ b/src/net/http/h2_bundle.go
@@ -883,7 +883,7 @@ func (c *http2dialCall) dial(ctx context.Context, addr string) {
 // This code decides which ones live or die.
 // The return value used is whether c was used.
 // c is never closed.
-func (p *http2clientConnPool) addConnIfNeeded(key string, t *http2Transport, c *tls.Conn) (used bool, err error) {
+func (p *http2clientConnPool) addConnIfNeeded(key string, t *http2Transport, c net.Conn) (used bool, err error) {
 	p.mu.Lock()
 	for _, cc := range p.conns[key] {
 		if cc.CanTakeNewRequest() {
@@ -919,8 +919,8 @@ type http2addConnCall struct {
 	err  error
 }
 
-func (c *http2addConnCall) run(t *http2Transport, key string, tc *tls.Conn) {
-	cc, err := t.NewClientConn(tc)
+func (c *http2addConnCall) run(t *http2Transport, key string, nc net.Conn) {
+	cc, err := t.NewClientConn(nc)
 
 	p := c.p
 	p.mu.Lock()
@@ -1035,6 +1035,169 @@ func http2shouldRetryDial(call *http2dialCall, req *Request) bool {
 	return call.ctx.Err() != nil
 }
 
+// http2Config is a package-internal version of net/http.HTTP2Config.
+//
+// http.HTTP2Config was added in Go 1.24.
+// When running with a version of net/http that includes HTTP2Config,
+// we merge the configuration with the fields in Transport or Server
+// to produce an http2Config.
+//
+// Zero valued fields in http2Config are interpreted as in the
+// net/http.HTTPConfig documentation.
+//
+// Precedence order for reconciling configurations is:
+//
+//   - Use the net/http.{Server,Transport}.HTTP2Config value, when non-zero.
+//   - Otherwise use the http2.{Server.Transport} value.
+//   - If the resulting value is zero or out of range, use a default.
+type http2http2Config struct {
+	MaxConcurrentStreams         uint32
+	MaxDecoderHeaderTableSize    uint32
+	MaxEncoderHeaderTableSize    uint32
+	MaxReadFrameSize             uint32
+	MaxUploadBufferPerConnection int32
+	MaxUploadBufferPerStream     int32
+	SendPingTimeout              time.Duration
+	PingTimeout                  time.Duration
+	WriteByteTimeout             time.Duration
+	PermitProhibitedCipherSuites bool
+	CountError                   func(errType string)
+}
+
+// configFromServer merges configuration settings from
+// net/http.Server.HTTP2Config and http2.Server.
+func http2configFromServer(h1 *Server, h2 *http2Server) http2http2Config {
+	conf := http2http2Config{
+		MaxConcurrentStreams:         h2.MaxConcurrentStreams,
+		MaxEncoderHeaderTableSize:    h2.MaxEncoderHeaderTableSize,
+		MaxDecoderHeaderTableSize:    h2.MaxDecoderHeaderTableSize,
+		MaxReadFrameSize:             h2.MaxReadFrameSize,
+		MaxUploadBufferPerConnection: h2.MaxUploadBufferPerConnection,
+		MaxUploadBufferPerStream:     h2.MaxUploadBufferPerStream,
+		SendPingTimeout:              h2.ReadIdleTimeout,
+		PingTimeout:                  h2.PingTimeout,
+		WriteByteTimeout:             h2.WriteByteTimeout,
+		PermitProhibitedCipherSuites: h2.PermitProhibitedCipherSuites,
+		CountError:                   h2.CountError,
+	}
+	http2fillNetHTTPServerConfig(&conf, h1)
+	http2setConfigDefaults(&conf, true)
+	return conf
+}
+
+// configFromServer merges configuration settings from h2 and h2.t1.HTTP2
+// (the net/http Transport).
+func http2configFromTransport(h2 *http2Transport) http2http2Config {
+	conf := http2http2Config{
+		MaxEncoderHeaderTableSize: h2.MaxEncoderHeaderTableSize,
+		MaxDecoderHeaderTableSize: h2.MaxDecoderHeaderTableSize,
+		MaxReadFrameSize:          h2.MaxReadFrameSize,
+		SendPingTimeout:           h2.ReadIdleTimeout,
+		PingTimeout:               h2.PingTimeout,
+		WriteByteTimeout:          h2.WriteByteTimeout,
+	}
+
+	// Unlike most config fields, where out-of-range values revert to the default,
+	// Transport.MaxReadFrameSize clips.
+	if conf.MaxReadFrameSize < http2minMaxFrameSize {
+		conf.MaxReadFrameSize = http2minMaxFrameSize
+	} else if conf.MaxReadFrameSize > http2maxFrameSize {
+		conf.MaxReadFrameSize = http2maxFrameSize
+	}
+
+	if h2.t1 != nil {
+		http2fillNetHTTPTransportConfig(&conf, h2.t1)
+	}
+	http2setConfigDefaults(&conf, false)
+	return conf
+}
+
+func http2setDefault[T ~int | ~int32 | ~uint32 | ~int64](v *T, minval, maxval, defval T) {
+	if *v < minval || *v > maxval {
+		*v = defval
+	}
+}
+
+func http2setConfigDefaults(conf *http2http2Config, server bool) {
+	http2setDefault(&conf.MaxConcurrentStreams, 1, math.MaxUint32, http2defaultMaxStreams)
+	http2setDefault(&conf.MaxEncoderHeaderTableSize, 1, math.MaxUint32, http2initialHeaderTableSize)
+	http2setDefault(&conf.MaxDecoderHeaderTableSize, 1, math.MaxUint32, http2initialHeaderTableSize)
+	if server {
+		http2setDefault(&conf.MaxUploadBufferPerConnection, http2initialWindowSize, math.MaxInt32, 1<<20)
+	} else {
+		http2setDefault(&conf.MaxUploadBufferPerConnection, http2initialWindowSize, math.MaxInt32, http2transportDefaultConnFlow)
+	}
+	if server {
+		http2setDefault(&conf.MaxUploadBufferPerStream, 1, math.MaxInt32, 1<<20)
+	} else {
+		http2setDefault(&conf.MaxUploadBufferPerStream, 1, math.MaxInt32, http2transportDefaultStreamFlow)
+	}
+	http2setDefault(&conf.MaxReadFrameSize, http2minMaxFrameSize, http2maxFrameSize, http2defaultMaxReadFrameSize)
+	http2setDefault(&conf.PingTimeout, 1, math.MaxInt64, 15*time.Second)
+}
+
+// adjustHTTP1MaxHeaderSize converts a limit in bytes on the size of an HTTP/1 header
+// to an HTTP/2 MAX_HEADER_LIST_SIZE value.
+func http2adjustHTTP1MaxHeaderSize(n int64) int64 {
+	// http2's count is in a slightly different unit and includes 32 bytes per pair.
+	// So, take the net/http.Server value and pad it up a bit, assuming 10 headers.
+	const perFieldOverhead = 32 // per http2 spec
+	const typicalHeaders = 10   // conservative
+	return n + typicalHeaders*perFieldOverhead
+}
+
+// fillNetHTTPServerConfig sets fields in conf from srv.HTTP2.
+func http2fillNetHTTPServerConfig(conf *http2http2Config, srv *Server) {
+	http2fillNetHTTPConfig(conf, srv.HTTP2)
+}
+
+// fillNetHTTPServerConfig sets fields in conf from tr.HTTP2.
+func http2fillNetHTTPTransportConfig(conf *http2http2Config, tr *Transport) {
+	http2fillNetHTTPConfig(conf, tr.HTTP2)
+}
+
+func http2fillNetHTTPConfig(conf *http2http2Config, h2 *HTTP2Config) {
+	if h2 == nil {
+		return
+	}
+	if h2.MaxConcurrentStreams != 0 {
+		conf.MaxConcurrentStreams = uint32(h2.MaxConcurrentStreams)
+	}
+	if h2.MaxEncoderHeaderTableSize != 0 {
+		conf.MaxEncoderHeaderTableSize = uint32(h2.MaxEncoderHeaderTableSize)
+	}
+	if h2.MaxDecoderHeaderTableSize != 0 {
+		conf.MaxDecoderHeaderTableSize = uint32(h2.MaxDecoderHeaderTableSize)
+	}
+	if h2.MaxConcurrentStreams != 0 {
+		conf.MaxConcurrentStreams = uint32(h2.MaxConcurrentStreams)
+	}
+	if h2.MaxReadFrameSize != 0 {
+		conf.MaxReadFrameSize = uint32(h2.MaxReadFrameSize)
+	}
+	if h2.MaxReceiveBufferPerConnection != 0 {
+		conf.MaxUploadBufferPerConnection = int32(h2.MaxReceiveBufferPerConnection)
+	}
+	if h2.MaxReceiveBufferPerStream != 0 {
+		conf.MaxUploadBufferPerStream = int32(h2.MaxReceiveBufferPerStream)
+	}
+	if h2.SendPingTimeout != 0 {
+		conf.SendPingTimeout = h2.SendPingTimeout
+	}
+	if h2.PingTimeout != 0 {
+		conf.PingTimeout = h2.PingTimeout
+	}
+	if h2.WriteByteTimeout != 0 {
+		conf.WriteByteTimeout = h2.WriteByteTimeout
+	}
+	if h2.PermitProhibitedCipherSuites {
+		conf.PermitProhibitedCipherSuites = true
+	}
+	if h2.CountError != nil {
+		conf.CountError = h2.CountError
+	}
+}
+
 // Buffer chunks are allocated from a pool to reduce pressure on GC.
 // The maximum wasted space per dataBuffer is 2x the largest size class,
 // which happens when the dataBuffer has multiple chunks and there is
@@ -2898,7 +3061,7 @@ func (mh *http2MetaHeadersFrame) checkPseudos() error {
 	pf := mh.PseudoFields()
 	for i, hf := range pf {
 		switch hf.Name {
-		case ":method", ":path", ":scheme", ":authority":
+		case ":method", ":path", ":scheme", ":authority", ":protocol":
 			isRequest = true
 		case ":status":
 			isResponse = true
@@ -2906,7 +3069,7 @@ func (mh *http2MetaHeadersFrame) checkPseudos() error {
 			return http2pseudoHeaderError(hf.Name)
 		}
 		// Check for duplicates.
-		// This would be a bad algorithm, but N is 4.
+		// This would be a bad algorithm, but N is 5.
 		// And this doesn't allocate.
 		for _, hf2 := range pf[:i] {
 			if hf.Name == hf2.Name {
@@ -3350,6 +3513,15 @@ var (
 	http2logFrameWrites bool
 	http2logFrameReads  bool
 	http2inTests        bool
+
+	// Enabling extended CONNECT by causes browsers to attempt to use
+	// WebSockets-over-HTTP/2. This results in problems when the server's websocket
+	// package doesn't support extended CONNECT.
+	//
+	// Disable extended CONNECT by default for now.
+	//
+	// Issue #71128.
+	http2disableExtendedConnectProtocol = true
 )
 
 func init() {
@@ -3362,6 +3534,9 @@ func init() {
 		http2logFrameWrites = true
 		http2logFrameReads = true
 	}
+	if strings.Contains(e, "http2xconnect=1") {
+		http2disableExtendedConnectProtocol = false
+	}
 }
 
 const (
@@ -3453,6 +3628,10 @@ func (s http2Setting) Valid() error {
 		if s.Val < 16384 || s.Val > 1<<24-1 {
 			return http2ConnectionError(http2ErrCodeProtocol)
 		}
+	case http2SettingEnableConnectProtocol:
+		if s.Val != 1 && s.Val != 0 {
+			return http2ConnectionError(http2ErrCodeProtocol)
+		}
 	}
 	return nil
 }
@@ -3462,21 +3641,23 @@ func (s http2Setting) Valid() error {
 type http2SettingID uint16
 
 const (
-	http2SettingHeaderTableSize      http2SettingID = 0x1
-	http2SettingEnablePush           http2SettingID = 0x2
-	http2SettingMaxConcurrentStreams http2SettingID = 0x3
-	http2SettingInitialWindowSize    http2SettingID = 0x4
-	http2SettingMaxFrameSize         http2SettingID = 0x5
-	http2SettingMaxHeaderListSize    http2SettingID = 0x6
+	http2SettingHeaderTableSize       http2SettingID = 0x1
+	http2SettingEnablePush            http2SettingID = 0x2
+	http2SettingMaxConcurrentStreams  http2SettingID = 0x3
+	http2SettingInitialWindowSize     http2SettingID = 0x4
+	http2SettingMaxFrameSize          http2SettingID = 0x5
+	http2SettingMaxHeaderListSize     http2SettingID = 0x6
+	http2SettingEnableConnectProtocol http2SettingID = 0x8
 )
 
 var http2settingName = map[http2SettingID]string{
-	http2SettingHeaderTableSize:      "HEADER_TABLE_SIZE",
-	http2SettingEnablePush:           "ENABLE_PUSH",
-	http2SettingMaxConcurrentStreams: "MAX_CONCURRENT_STREAMS",
-	http2SettingInitialWindowSize:    "INITIAL_WINDOW_SIZE",
-	http2SettingMaxFrameSize:         "MAX_FRAME_SIZE",
-	http2SettingMaxHeaderListSize:    "MAX_HEADER_LIST_SIZE",
+	http2SettingHeaderTableSize:       "HEADER_TABLE_SIZE",
+	http2SettingEnablePush:            "ENABLE_PUSH",
+	http2SettingMaxConcurrentStreams:  "MAX_CONCURRENT_STREAMS",
+	http2SettingInitialWindowSize:     "INITIAL_WINDOW_SIZE",
+	http2SettingMaxFrameSize:          "MAX_FRAME_SIZE",
+	http2SettingMaxHeaderListSize:     "MAX_HEADER_LIST_SIZE",
+	http2SettingEnableConnectProtocol: "ENABLE_CONNECT_PROTOCOL",
 }
 
 func (s http2SettingID) String() string {
@@ -3550,13 +3731,19 @@ func (cw http2closeWaiter) Wait() {
 // Its buffered writer is lazily allocated as needed, to minimize
 // idle memory usage with many connections.
 type http2bufferedWriter struct {
-	_  http2incomparable
-	w  io.Writer     // immutable
-	bw *bufio.Writer // non-nil when data is buffered
+	_           http2incomparable
+	group       http2synctestGroupInterface // immutable
+	conn        net.Conn                    // immutable
+	bw          *bufio.Writer               // non-nil when data is buffered
+	byteTimeout time.Duration               // immutable, WriteByteTimeout
 }
 
-func http2newBufferedWriter(w io.Writer) *http2bufferedWriter {
-	return &http2bufferedWriter{w: w}
+func http2newBufferedWriter(group http2synctestGroupInterface, conn net.Conn, timeout time.Duration) *http2bufferedWriter {
+	return &http2bufferedWriter{
+		group:       group,
+		conn:        conn,
+		byteTimeout: timeout,
+	}
 }
 
 // bufWriterPoolBufferSize is the size of bufio.Writer's
@@ -3583,7 +3770,7 @@ func (w *http2bufferedWriter) Available() int {
 func (w *http2bufferedWriter) Write(p []byte) (n int, err error) {
 	if w.bw == nil {
 		bw := http2bufWriterPool.Get().(*bufio.Writer)
-		bw.Reset(w.w)
+		bw.Reset((*http2bufferedWriterTimeoutWriter)(w))
 		w.bw = bw
 	}
 	return w.bw.Write(p)
@@ -3601,6 +3788,38 @@ func (w *http2bufferedWriter) Flush() error {
 	return err
 }
 
+type http2bufferedWriterTimeoutWriter http2bufferedWriter
+
+func (w *http2bufferedWriterTimeoutWriter) Write(p []byte) (n int, err error) {
+	return http2writeWithByteTimeout(w.group, w.conn, w.byteTimeout, p)
+}
+
+// writeWithByteTimeout writes to conn.
+// If more than timeout passes without any bytes being written to the connection,
+// the write fails.
+func http2writeWithByteTimeout(group http2synctestGroupInterface, conn net.Conn, timeout time.Duration, p []byte) (n int, err error) {
+	if timeout <= 0 {
+		return conn.Write(p)
+	}
+	for {
+		var now time.Time
+		if group == nil {
+			now = time.Now()
+		} else {
+			now = group.Now()
+		}
+		conn.SetWriteDeadline(now.Add(timeout))
+		nn, err := conn.Write(p[n:])
+		n += nn
+		if n == len(p) || nn == 0 || !errors.Is(err, os.ErrDeadlineExceeded) {
+			// Either we finished the write, made no progress, or hit the deadline.
+			// Whichever it is, we're done now.
+			conn.SetWriteDeadline(time.Time{})
+			return n, err
+		}
+	}
+}
+
 func http2mustUint31(v int32) uint32 {
 	if v < 0 || v > 2147483647 {
 		panic("out of range")
@@ -3882,10 +4101,14 @@ func (p *http2pipe) Done() <-chan struct{} {
 }
 
 const (
-	http2prefaceTimeout         = 10 * time.Second
-	http2firstSettingsTimeout   = 2 * time.Second // should be in-flight with preface anyway
-	http2handlerChunkWriteSize  = 4 << 10
-	http2defaultMaxStreams      = 250 // TODO: make this 100 as the GFE seems to?
+	http2prefaceTimeout        = 10 * time.Second
+	http2firstSettingsTimeout  = 2 * time.Second // should be in-flight with preface anyway
+	http2handlerChunkWriteSize = 4 << 10
+	http2defaultMaxStreams     = 250 // TODO: make this 100 as the GFE seems to?
+
+	// maxQueuedControlFrames is the maximum number of control frames like
+	// SETTINGS, PING and RST_STREAM that will be queued for writing before
+	// the connection is closed to prevent memory exhaustion attacks.
 	http2maxQueuedControlFrames = 10000
 )
 
@@ -3957,6 +4180,22 @@ type http2Server struct {
 	// If zero or negative, there is no timeout.
 	IdleTimeout time.Duration
 
+	// ReadIdleTimeout is the timeout after which a health check using a ping
+	// frame will be carried out if no frame is received on the connection.
+	// If zero, no health check is performed.
+	ReadIdleTimeout time.Duration
+
+	// PingTimeout is the timeout after which the connection will be closed
+	// if a response to a ping is not received.
+	// If zero, a default of 15 seconds is used.
+	PingTimeout time.Duration
+
+	// WriteByteTimeout is the timeout after which a connection will be
+	// closed if no data can be written to it. The timeout begins when data is
+	// available to write, and is extended whenever any bytes are written.
+	// If zero or negative, there is no timeout.
+	WriteByteTimeout time.Duration
+
 	// MaxUploadBufferPerConnection is the size of the initial flow
 	// control window for each connections. The HTTP/2 spec does not
 	// allow this to be smaller than 65535 or larger than 2^32-1.
@@ -4019,57 +4258,6 @@ func (s *http2Server) afterFunc(d time.Duration, f func()) http2timer {
 	return http2timeTimer{time.AfterFunc(d, f)}
 }
 
-func (s *http2Server) initialConnRecvWindowSize() int32 {
-	if s.MaxUploadBufferPerConnection >= http2initialWindowSize {
-		return s.MaxUploadBufferPerConnection
-	}
-	return 1 << 20
-}
-
-func (s *http2Server) initialStreamRecvWindowSize() int32 {
-	if s.MaxUploadBufferPerStream > 0 {
-		return s.MaxUploadBufferPerStream
-	}
-	return 1 << 20
-}
-
-func (s *http2Server) maxReadFrameSize() uint32 {
-	if v := s.MaxReadFrameSize; v >= http2minMaxFrameSize && v <= http2maxFrameSize {
-		return v
-	}
-	return http2defaultMaxReadFrameSize
-}
-
-func (s *http2Server) maxConcurrentStreams() uint32 {
-	if v := s.MaxConcurrentStreams; v > 0 {
-		return v
-	}
-	return http2defaultMaxStreams
-}
-
-func (s *http2Server) maxDecoderHeaderTableSize() uint32 {
-	if v := s.MaxDecoderHeaderTableSize; v > 0 {
-		return v
-	}
-	return http2initialHeaderTableSize
-}
-
-func (s *http2Server) maxEncoderHeaderTableSize() uint32 {
-	if v := s.MaxEncoderHeaderTableSize; v > 0 {
-		return v
-	}
-	return http2initialHeaderTableSize
-}
-
-// maxQueuedControlFrames is the maximum number of control frames like
-// SETTINGS, PING and RST_STREAM that will be queued for writing before
-// the connection is closed to prevent memory exhaustion attacks.
-func (s *http2Server) maxQueuedControlFrames() int {
-	// TODO: if anybody asks, add a Server field, and remember to define the
-	// behavior of negative values.
-	return http2maxQueuedControlFrames
-}
-
 type http2serverInternalState struct {
 	mu          sync.Mutex
 	activeConns map[*http2serverConn]struct{}
@@ -4166,7 +4354,7 @@ func http2ConfigureServer(s *Server, conf *http2Server) error {
 	if s.TLSNextProto == nil {
 		s.TLSNextProto = map[string]func(*Server, *tls.Conn, Handler){}
 	}
-	protoHandler := func(hs *Server, c *tls.Conn, h Handler) {
+	protoHandler := func(hs *Server, c net.Conn, h Handler, sawClientPreface bool) {
 		if http2testHookOnConn != nil {
 			http2testHookOnConn()
 		}
@@ -4183,12 +4371,31 @@ func http2ConfigureServer(s *Server, conf *http2Server) error {
 			ctx = bc.BaseContext()
 		}
 		conf.ServeConn(c, &http2ServeConnOpts{
-			Context:    ctx,
-			Handler:    h,
-			BaseConfig: hs,
+			Context:          ctx,
+			Handler:          h,
+			BaseConfig:       hs,
+			SawClientPreface: sawClientPreface,
 		})
 	}
-	s.TLSNextProto[http2NextProtoTLS] = protoHandler
+	s.TLSNextProto[http2NextProtoTLS] = func(hs *Server, c *tls.Conn, h Handler) {
+		protoHandler(hs, c, h, false)
+	}
+	// The "unencrypted_http2" TLSNextProto key is used to pass off non-TLS HTTP/2 conns.
+	//
+	// A connection passed in this method has already had the HTTP/2 preface read from it.
+	s.TLSNextProto[http2nextProtoUnencryptedHTTP2] = func(hs *Server, c *tls.Conn, h Handler) {
+		nc, err := http2unencryptedNetConnFromTLSConn(c)
+		if err != nil {
+			if lg := hs.ErrorLog; lg != nil {
+				lg.Print(err)
+			} else {
+				log.Print(err)
+			}
+			go c.Close()
+			return
+		}
+		protoHandler(hs, nc, h, true)
+	}
 	return nil
 }
 
@@ -4270,13 +4477,15 @@ func (s *http2Server) serveConn(c net.Conn, opts *http2ServeConnOpts, newf func(
 	baseCtx, cancel := http2serverConnBaseContext(c, opts)
 	defer cancel()
 
+	http1srv := opts.baseConfig()
+	conf := http2configFromServer(http1srv, s)
 	sc := &http2serverConn{
 		srv:                         s,
-		hs:                          opts.baseConfig(),
+		hs:                          http1srv,
 		conn:                        c,
 		baseCtx:                     baseCtx,
 		remoteAddrStr:               c.RemoteAddr().String(),
-		bw:                          http2newBufferedWriter(c),
+		bw:                          http2newBufferedWriter(s.group, c, conf.WriteByteTimeout),
 		handler:                     opts.handler(),
 		streams:                     make(map[uint32]*http2stream),
 		readFrameCh:                 make(chan http2readFrameResult),
@@ -4286,9 +4495,12 @@ func (s *http2Server) serveConn(c net.Conn, opts *http2ServeConnOpts, newf func(
 		bodyReadCh:                  make(chan http2bodyReadMsg),         // buffering doesn't matter either way
 		doneServing:                 make(chan struct{}),
 		clientMaxStreams:            math.MaxUint32, // Section 6.5.2: "Initially, there is no limit to this value"
-		advMaxStreams:               s.maxConcurrentStreams(),
+		advMaxStreams:               conf.MaxConcurrentStreams,
 		initialStreamSendWindowSize: http2initialWindowSize,
+		initialStreamRecvWindowSize: conf.MaxUploadBufferPerStream,
 		maxFrameSize:                http2initialMaxFrameSize,
+		pingTimeout:                 conf.PingTimeout,
+		countErrorFunc:              conf.CountError,
 		serveG:                      http2newGoroutineLock(),
 		pushEnabled:                 true,
 		sawClientPreface:            opts.SawClientPreface,
@@ -4321,15 +4533,15 @@ func (s *http2Server) serveConn(c net.Conn, opts *http2ServeConnOpts, newf func(
 	sc.flow.add(http2initialWindowSize)
 	sc.inflow.init(http2initialWindowSize)
 	sc.hpackEncoder = hpack.NewEncoder(&sc.headerWriteBuf)
-	sc.hpackEncoder.SetMaxDynamicTableSizeLimit(s.maxEncoderHeaderTableSize())
+	sc.hpackEncoder.SetMaxDynamicTableSizeLimit(conf.MaxEncoderHeaderTableSize)
 
 	fr := http2NewFramer(sc.bw, c)
-	if s.CountError != nil {
-		fr.countError = s.CountError
+	if conf.CountError != nil {
+		fr.countError = conf.CountError
 	}
-	fr.ReadMetaHeaders = hpack.NewDecoder(s.maxDecoderHeaderTableSize(), nil)
+	fr.ReadMetaHeaders = hpack.NewDecoder(conf.MaxDecoderHeaderTableSize, nil)
 	fr.MaxHeaderListSize = sc.maxHeaderListSize()
-	fr.SetMaxReadFrameSize(s.maxReadFrameSize())
+	fr.SetMaxReadFrameSize(conf.MaxReadFrameSize)
 	sc.framer = fr
 
 	if tc, ok := c.(http2connectionStater); ok {
@@ -4362,7 +4574,7 @@ func (s *http2Server) serveConn(c net.Conn, opts *http2ServeConnOpts, newf func(
 			// So for now, do nothing here again.
 		}
 
-		if !s.PermitProhibitedCipherSuites && http2isBadCipher(sc.tlsState.CipherSuite) {
+		if !conf.PermitProhibitedCipherSuites && http2isBadCipher(sc.tlsState.CipherSuite) {
 			// "Endpoints MAY choose to generate a connection error
 			// (Section 5.4.1) of type INADEQUATE_SECURITY if one of
 			// the prohibited cipher suites are negotiated."
@@ -4399,7 +4611,7 @@ func (s *http2Server) serveConn(c net.Conn, opts *http2ServeConnOpts, newf func(
 		opts.UpgradeRequest = nil
 	}
 
-	sc.serve()
+	sc.serve(conf)
 }
 
 func http2serverConnBaseContext(c net.Conn, opts *http2ServeConnOpts) (ctx context.Context, cancel func()) {
@@ -4439,6 +4651,7 @@ type http2serverConn struct {
 	tlsState         *tls.ConnectionState        // shared by all handlers, like net/http
 	remoteAddrStr    string
 	writeSched       http2WriteScheduler
+	countErrorFunc   func(errType string)
 
 	// Everything following is owned by the serve loop; use serveG.check():
 	serveG                      http2goroutineLock // used to verify funcs are on serve()
@@ -4458,6 +4671,7 @@ type http2serverConn struct {
 	streams                     map[uint32]*http2stream
 	unstartedHandlers           []http2unstartedHandler
 	initialStreamSendWindowSize int32
+	initialStreamRecvWindowSize int32
 	maxFrameSize                int32
 	peerMaxHeaderListSize       uint32            // zero means unknown (default)
 	canonHeader                 map[string]string // http2-lower-case -> Go-Canonical-Case
@@ -4468,9 +4682,14 @@ type http2serverConn struct {
 	inGoAway                    bool              // we've started to or sent GOAWAY
 	inFrameScheduleLoop         bool              // whether we're in the scheduleFrameWrite loop
 	needToSendGoAway            bool              // we need to schedule a GOAWAY frame write
+	pingSent                    bool
+	sentPingData                [8]byte
 	goAwayCode                  http2ErrCode
 	shutdownTimer               http2timer // nil until used
 	idleTimer                   http2timer // nil if unused
+	readIdleTimeout             time.Duration
+	pingTimeout                 time.Duration
+	readIdleTimer               http2timer // nil if unused
 
 	// Owned by the writeFrameAsync goroutine:
 	headerWriteBuf bytes.Buffer
@@ -4485,11 +4704,7 @@ func (sc *http2serverConn) maxHeaderListSize() uint32 {
 	if n <= 0 {
 		n = DefaultMaxHeaderBytes
 	}
-	// http2's count is in a slightly different unit and includes 32 bytes per pair.
-	// So, take the net/http.Server value and pad it up a bit, assuming 10 headers.
-	const perFieldOverhead = 32 // per http2 spec
-	const typicalHeaders = 10   // conservative
-	return uint32(n + typicalHeaders*perFieldOverhead)
+	return uint32(http2adjustHTTP1MaxHeaderSize(int64(n)))
 }
 
 func (sc *http2serverConn) curOpenStreams() uint32 {
@@ -4756,7 +4971,7 @@ func (sc *http2serverConn) notePanic() {
 	}
 }
 
-func (sc *http2serverConn) serve() {
+func (sc *http2serverConn) serve(conf http2http2Config) {
 	sc.serveG.check()
 	defer sc.notePanic()
 	defer sc.conn.Close()
@@ -4768,20 +4983,24 @@ func (sc *http2serverConn) serve() {
 		sc.vlogf("http2: server connection from %v on %p", sc.conn.RemoteAddr(), sc.hs)
 	}
 
+	settings := http2writeSettings{
+		{http2SettingMaxFrameSize, conf.MaxReadFrameSize},
+		{http2SettingMaxConcurrentStreams, sc.advMaxStreams},
+		{http2SettingMaxHeaderListSize, sc.maxHeaderListSize()},
+		{http2SettingHeaderTableSize, conf.MaxDecoderHeaderTableSize},
+		{http2SettingInitialWindowSize, uint32(sc.initialStreamRecvWindowSize)},
+	}
+	if !http2disableExtendedConnectProtocol {
+		settings = append(settings, http2Setting{http2SettingEnableConnectProtocol, 1})
+	}
 	sc.writeFrame(http2FrameWriteRequest{
-		write: http2writeSettings{
-			{http2SettingMaxFrameSize, sc.srv.maxReadFrameSize()},
-			{http2SettingMaxConcurrentStreams, sc.advMaxStreams},
-			{http2SettingMaxHeaderListSize, sc.maxHeaderListSize()},
-			{http2SettingHeaderTableSize, sc.srv.maxDecoderHeaderTableSize()},
-			{http2SettingInitialWindowSize, uint32(sc.srv.initialStreamRecvWindowSize())},
-		},
+		write: settings,
 	})
 	sc.unackedSettings++
 
 	// Each connection starts with initialWindowSize inflow tokens.
 	// If a higher value is configured, we add more tokens.
-	if diff := sc.srv.initialConnRecvWindowSize() - http2initialWindowSize; diff > 0 {
+	if diff := conf.MaxUploadBufferPerConnection - http2initialWindowSize; diff > 0 {
 		sc.sendWindowUpdate(nil, int(diff))
 	}
 
@@ -4801,11 +5020,18 @@ func (sc *http2serverConn) serve() {
 		defer sc.idleTimer.Stop()
 	}
 
+	if conf.SendPingTimeout > 0 {
+		sc.readIdleTimeout = conf.SendPingTimeout
+		sc.readIdleTimer = sc.srv.afterFunc(conf.SendPingTimeout, sc.onReadIdleTimer)
+		defer sc.readIdleTimer.Stop()
+	}
+
 	go sc.readFrames() // closed by defer sc.conn.Close above
 
 	settingsTimer := sc.srv.afterFunc(http2firstSettingsTimeout, sc.onSettingsTimer)
 	defer settingsTimer.Stop()
 
+	lastFrameTime := sc.srv.now()
 	loopNum := 0
 	for {
 		loopNum++
@@ -4819,6 +5045,7 @@ func (sc *http2serverConn) serve() {
 		case res := <-sc.wroteFrameCh:
 			sc.wroteFrame(res)
 		case res := <-sc.readFrameCh:
+			lastFrameTime = sc.srv.now()
 			// Process any written frames before reading new frames from the client since a
 			// written frame could have triggered a new stream to be started.
 			if sc.writingFrameAsync {
@@ -4850,6 +5077,8 @@ func (sc *http2serverConn) serve() {
 				case http2idleTimerMsg:
 					sc.vlogf("connection is idle")
 					sc.goAway(http2ErrCodeNo)
+				case http2readIdleTimerMsg:
+					sc.handlePingTimer(lastFrameTime)
 				case http2shutdownTimerMsg:
 					sc.vlogf("GOAWAY close timer fired; closing conn from %v", sc.conn.RemoteAddr())
 					return
@@ -4872,7 +5101,7 @@ func (sc *http2serverConn) serve() {
 		// If the peer is causing us to generate a lot of control frames,
 		// but not reading them from us, assume they are trying to make us
 		// run out of memory.
-		if sc.queuedControlFrames > sc.srv.maxQueuedControlFrames() {
+		if sc.queuedControlFrames > http2maxQueuedControlFrames {
 			sc.vlogf("http2: too many control frames in send queue, closing connection")
 			return
 		}
@@ -4888,12 +5117,39 @@ func (sc *http2serverConn) serve() {
 	}
 }
 
+func (sc *http2serverConn) handlePingTimer(lastFrameReadTime time.Time) {
+	if sc.pingSent {
+		sc.vlogf("timeout waiting for PING response")
+		sc.conn.Close()
+		return
+	}
+
+	pingAt := lastFrameReadTime.Add(sc.readIdleTimeout)
+	now := sc.srv.now()
+	if pingAt.After(now) {
+		// We received frames since arming the ping timer.
+		// Reset it for the next possible timeout.
+		sc.readIdleTimer.Reset(pingAt.Sub(now))
+		return
+	}
+
+	sc.pingSent = true
+	// Ignore crypto/rand.Read errors: It generally can't fail, and worse case if it does
+	// is we send a PING frame containing 0s.
+	_, _ = rand.Read(sc.sentPingData[:])
+	sc.writeFrame(http2FrameWriteRequest{
+		write: &http2writePing{data: sc.sentPingData},
+	})
+	sc.readIdleTimer.Reset(sc.pingTimeout)
+}
+
 type http2serverMessage int
 
 // Message values sent to serveMsgCh.
 var (
 	http2settingsTimerMsg    = new(http2serverMessage)
 	http2idleTimerMsg        = new(http2serverMessage)
+	http2readIdleTimerMsg    = new(http2serverMessage)
 	http2shutdownTimerMsg    = new(http2serverMessage)
 	http2gracefulShutdownMsg = new(http2serverMessage)
 	http2handlerDoneMsg      = new(http2serverMessage)
@@ -4903,6 +5159,8 @@ func (sc *http2serverConn) onSettingsTimer() { sc.sendServeMsg(http2settingsTime
 
 func (sc *http2serverConn) onIdleTimer() { sc.sendServeMsg(http2idleTimerMsg) }
 
+func (sc *http2serverConn) onReadIdleTimer() { sc.sendServeMsg(http2readIdleTimerMsg) }
+
 func (sc *http2serverConn) onShutdownTimer() { sc.sendServeMsg(http2shutdownTimerMsg) }
 
 func (sc *http2serverConn) sendServeMsg(msg interface{}) {
@@ -5155,6 +5413,10 @@ func (sc *http2serverConn) wroteFrame(res http2frameWriteResult) {
 	sc.writingFrame = false
 	sc.writingFrameAsync = false
 
+	if res.err != nil {
+		sc.conn.Close()
+	}
+
 	wr := res.wr
 
 	if http2writeEndsStream(wr.write) {
@@ -5429,6 +5691,11 @@ func (sc *http2serverConn) processFrame(f http2Frame) error {
 func (sc *http2serverConn) processPing(f *http2PingFrame) error {
 	sc.serveG.check()
 	if f.IsAck() {
+		if sc.pingSent && sc.sentPingData == f.Data {
+			// This is a response to a PING we sent.
+			sc.pingSent = false
+			sc.readIdleTimer.Reset(sc.readIdleTimeout)
+		}
 		// 6.7 PING: " An endpoint MUST NOT respond to PING frames
 		// containing this flag."
 		return nil
@@ -5592,6 +5859,9 @@ func (sc *http2serverConn) processSetting(s http2Setting) error {
 		sc.maxFrameSize = int32(s.Val) // the maximum valid s.Val is < 2^31
 	case http2SettingMaxHeaderListSize:
 		sc.peerMaxHeaderListSize = s.Val
+	case http2SettingEnableConnectProtocol:
+		// Receipt of this parameter by a server does not
+		// have any impact
 	default:
 		// Unknown setting: "An endpoint that receives a SETTINGS
 		// frame with any unknown or unsupported identifier MUST
@@ -5995,7 +6265,7 @@ func (sc *http2serverConn) newStream(id, pusherID uint32, state http2streamState
 	st.cw.Init()
 	st.flow.conn = &sc.flow // link to conn-level counter
 	st.flow.add(sc.initialStreamSendWindowSize)
-	st.inflow.init(sc.srv.initialStreamRecvWindowSize())
+	st.inflow.init(sc.initialStreamRecvWindowSize)
 	if sc.hs.WriteTimeout > 0 {
 		st.writeDeadline = sc.srv.afterFunc(sc.hs.WriteTimeout, st.onWriteTimeout)
 	}
@@ -6022,11 +6292,17 @@ func (sc *http2serverConn) newWriterAndRequest(st *http2stream, f *http2MetaHead
 		scheme:    f.PseudoValue("scheme"),
 		authority: f.PseudoValue("authority"),
 		path:      f.PseudoValue("path"),
+		protocol:  f.PseudoValue("protocol"),
+	}
+
+	// extended connect is disabled, so we should not see :protocol
+	if http2disableExtendedConnectProtocol && rp.protocol != "" {
+		return nil, nil, sc.countError("bad_connect", http2streamError(f.StreamID, http2ErrCodeProtocol))
 	}
 
 	isConnect := rp.method == "CONNECT"
 	if isConnect {
-		if rp.path != "" || rp.scheme != "" || rp.authority == "" {
+		if rp.protocol == "" && (rp.path != "" || rp.scheme != "" || rp.authority == "") {
 			return nil, nil, sc.countError("bad_connect", http2streamError(f.StreamID, http2ErrCodeProtocol))
 		}
 	} else if rp.method == "" || rp.path == "" || (rp.scheme != "https" && rp.scheme != "http") {
@@ -6050,6 +6326,9 @@ func (sc *http2serverConn) newWriterAndRequest(st *http2stream, f *http2MetaHead
 	if rp.authority == "" {
 		rp.authority = rp.header.Get("Host")
 	}
+	if rp.protocol != "" {
+		rp.header.Set(":protocol", rp.protocol)
+	}
 
 	rw, req, err := sc.newWriterAndRequestNoBody(st, rp)
 	if err != nil {
@@ -6076,6 +6355,7 @@ func (sc *http2serverConn) newWriterAndRequest(st *http2stream, f *http2MetaHead
 type http2requestParam struct {
 	method                  string
 	scheme, authority, path string
+	protocol                string
 	header                  Header
 }
 
@@ -6117,7 +6397,7 @@ func (sc *http2serverConn) newWriterAndRequestNoBody(st *http2stream, rp http2re
 
 	var url_ *url.URL
 	var requestURI string
-	if rp.method == "CONNECT" {
+	if rp.method == "CONNECT" && rp.protocol == "" {
 		url_ = &url.URL{Host: rp.authority}
 		requestURI = rp.authority // mimic HTTP/1 server behavior
 	} else {
@@ -6690,6 +6970,11 @@ func (w *http2responseWriter) SetWriteDeadline(deadline time.Time) error {
 	return nil
 }
 
+func (w *http2responseWriter) EnableFullDuplex() error {
+	// We always support full duplex responses, so this is a no-op.
+	return nil
+}
+
 func (w *http2responseWriter) Flush() {
 	w.FlushError()
 }
@@ -7136,7 +7421,7 @@ func (sc *http2serverConn) countError(name string, err error) error {
 	if sc == nil || sc.srv == nil {
 		return err
 	}
-	f := sc.srv.CountError
+	f := sc.countErrorFunc
 	if f == nil {
 		return err
 	}
@@ -7339,6 +7624,20 @@ func (t *http2Transport) markNewGoroutine() {
 	}
 }
 
+func (t *http2Transport) now() time.Time {
+	if t != nil && t.http2transportTestHooks != nil {
+		return t.http2transportTestHooks.group.Now()
+	}
+	return time.Now()
+}
+
+func (t *http2Transport) timeSince(when time.Time) time.Duration {
+	if t != nil && t.http2transportTestHooks != nil {
+		return t.now().Sub(when)
+	}
+	return time.Since(when)
+}
+
 // newTimer creates a new time.Timer, or a synthetic timer in tests.
 func (t *http2Transport) newTimer(d time.Duration) http2timer {
 	if t.http2transportTestHooks != nil {
@@ -7363,40 +7662,26 @@ func (t *http2Transport) contextWithTimeout(ctx context.Context, d time.Duration
 }
 
 func (t *http2Transport) maxHeaderListSize() uint32 {
-	if t.MaxHeaderListSize == 0 {
+	n := int64(t.MaxHeaderListSize)
+	if t.t1 != nil && t.t1.MaxResponseHeaderBytes != 0 {
+		n = t.t1.MaxResponseHeaderBytes
+		if n > 0 {
+			n = http2adjustHTTP1MaxHeaderSize(n)
+		}
+	}
+	if n <= 0 {
 		return 10 << 20
 	}
-	if t.MaxHeaderListSize == 0xffffffff {
+	if n >= 0xffffffff {
 		return 0
 	}
-	return t.MaxHeaderListSize
-}
-
-func (t *http2Transport) maxFrameReadSize() uint32 {
-	if t.MaxReadFrameSize == 0 {
-		return 0 // use the default provided by the peer
-	}
-	if t.MaxReadFrameSize < http2minMaxFrameSize {
-		return http2minMaxFrameSize
-	}
-	if t.MaxReadFrameSize > http2maxFrameSize {
-		return http2maxFrameSize
-	}
-	return t.MaxReadFrameSize
+	return uint32(n)
 }
 
 func (t *http2Transport) disableCompression() bool {
 	return t.DisableCompression || (t.t1 != nil && t.t1.DisableCompression)
 }
 
-func (t *http2Transport) pingTimeout() time.Duration {
-	if t.PingTimeout == 0 {
-		return 15 * time.Second
-	}
-	return t.PingTimeout
-
-}
-
 // ConfigureTransport configures a net/http HTTP/1 Transport to use HTTP/2.
 // It returns an error if t1 has already been HTTP/2-enabled.
 //
@@ -7432,8 +7717,8 @@ func http2configureTransports(t1 *Transport) (*http2Transport, error) {
 	if !http2strSliceContains(t1.TLSClientConfig.NextProtos, "http/1.1") {
 		t1.TLSClientConfig.NextProtos = append(t1.TLSClientConfig.NextProtos, "http/1.1")
 	}
-	upgradeFn := func(authority string, c *tls.Conn) RoundTripper {
-		addr := http2authorityAddr("https", authority)
+	upgradeFn := func(scheme, authority string, c net.Conn) RoundTripper {
+		addr := http2authorityAddr(scheme, authority)
 		if used, err := connPool.addConnIfNeeded(addr, t2, c); err != nil {
 			go c.Close()
 			return http2erringRoundTripper{err}
@@ -7444,18 +7729,37 @@ func http2configureTransports(t1 *Transport) (*http2Transport, error) {
 			// was unknown)
 			go c.Close()
 		}
+		if scheme == "http" {
+			return (*http2unencryptedTransport)(t2)
+		}
 		return t2
 	}
-	if m := t1.TLSNextProto; len(m) == 0 {
-		t1.TLSNextProto = map[string]func(string, *tls.Conn) RoundTripper{
-			"h2": upgradeFn,
+	if t1.TLSNextProto == nil {
+		t1.TLSNextProto = make(map[string]func(string, *tls.Conn) RoundTripper)
+	}
+	t1.TLSNextProto[http2NextProtoTLS] = func(authority string, c *tls.Conn) RoundTripper {
+		return upgradeFn("https", authority, c)
+	}
+	// The "unencrypted_http2" TLSNextProto key is used to pass off non-TLS HTTP/2 conns.
+	t1.TLSNextProto[http2nextProtoUnencryptedHTTP2] = func(authority string, c *tls.Conn) RoundTripper {
+		nc, err := http2unencryptedNetConnFromTLSConn(c)
+		if err != nil {
+			go c.Close()
+			return http2erringRoundTripper{err}
 		}
-	} else {
-		m["h2"] = upgradeFn
+		return upgradeFn("http", authority, nc)
 	}
 	return t2, nil
 }
 
+// unencryptedTransport is a Transport with a RoundTrip method that
+// always permits http:// URLs.
+type http2unencryptedTransport http2Transport
+
+func (t *http2unencryptedTransport) RoundTrip(req *Request) (*Response, error) {
+	return (*http2Transport)(t).RoundTripOpt(req, http2RoundTripOpt{allowHTTP: true})
+}
+
 func (t *http2Transport) connPool() http2ClientConnPool {
 	t.connPoolOnce.Do(t.initConnPool)
 	return t.connPoolOrDef
@@ -7475,7 +7779,7 @@ type http2ClientConn struct {
 	t             *http2Transport
 	tconn         net.Conn             // usually *tls.Conn, except specialized impls
 	tlsState      *tls.ConnectionState // nil only for specialized impls
-	reused        uint32               // whether conn is being reused; atomic
+	atomicReused  uint32               // whether conn is being reused; atomic
 	singleUse     bool                 // whether being used for a single http.Request
 	getConnCalled bool                 // used by clientConnPool
 
@@ -7486,31 +7790,54 @@ type http2ClientConn struct {
 	idleTimeout time.Duration // or 0 for never
 	idleTimer   http2timer
 
-	mu              sync.Mutex   // guards following
-	cond            *sync.Cond   // hold mu; broadcast on flow/closed changes
-	flow            http2outflow // our conn-level flow control quota (cs.outflow is per stream)
-	inflow          http2inflow  // peer's conn-level flow control
-	doNotReuse      bool         // whether conn is marked to not be reused for any future requests
-	closing         bool
-	closed          bool
-	seenSettings    bool                          // true if we've seen a settings frame, false otherwise
-	wantSettingsAck bool                          // we sent a SETTINGS frame and haven't heard back
-	goAway          *http2GoAwayFrame             // if non-nil, the GoAwayFrame we received
-	goAwayDebug     string                        // goAway frame's debug data, retained as a string
-	streams         map[uint32]*http2clientStream // client-initiated
-	streamsReserved int                           // incr by ReserveNewRequest; decr on RoundTrip
-	nextStreamID    uint32
-	pendingRequests int                       // requests blocked and waiting to be sent because len(streams) == maxConcurrentStreams
-	pings           map[[8]byte]chan struct{} // in flight ping data to notification channel
-	br              *bufio.Reader
-	lastActive      time.Time
-	lastIdle        time.Time // time last idle
+	mu               sync.Mutex   // guards following
+	cond             *sync.Cond   // hold mu; broadcast on flow/closed changes
+	flow             http2outflow // our conn-level flow control quota (cs.outflow is per stream)
+	inflow           http2inflow  // peer's conn-level flow control
+	doNotReuse       bool         // whether conn is marked to not be reused for any future requests
+	closing          bool
+	closed           bool
+	seenSettings     bool                          // true if we've seen a settings frame, false otherwise
+	seenSettingsChan chan struct{}                 // closed when seenSettings is true or frame reading fails
+	wantSettingsAck  bool                          // we sent a SETTINGS frame and haven't heard back
+	goAway           *http2GoAwayFrame             // if non-nil, the GoAwayFrame we received
+	goAwayDebug      string                        // goAway frame's debug data, retained as a string
+	streams          map[uint32]*http2clientStream // client-initiated
+	streamsReserved  int                           // incr by ReserveNewRequest; decr on RoundTrip
+	nextStreamID     uint32
+	pendingRequests  int                       // requests blocked and waiting to be sent because len(streams) == maxConcurrentStreams
+	pings            map[[8]byte]chan struct{} // in flight ping data to notification channel
+	br               *bufio.Reader
+	lastActive       time.Time
+	lastIdle         time.Time // time last idle
 	// Settings from peer: (also guarded by wmu)
-	maxFrameSize           uint32
-	maxConcurrentStreams   uint32
-	peerMaxHeaderListSize  uint64
-	peerMaxHeaderTableSize uint32
-	initialWindowSize      uint32
+	maxFrameSize                uint32
+	maxConcurrentStreams        uint32
+	peerMaxHeaderListSize       uint64
+	peerMaxHeaderTableSize      uint32
+	initialWindowSize           uint32
+	initialStreamRecvWindowSize int32
+	readIdleTimeout             time.Duration
+	pingTimeout                 time.Duration
+	extendedConnectAllowed      bool
+
+	// rstStreamPingsBlocked works around an unfortunate gRPC behavior.
+	// gRPC strictly limits the number of PING frames that it will receive.
+	// The default is two pings per two hours, but the limit resets every time
+	// the gRPC endpoint sends a HEADERS or DATA frame. See golang/go#70575.
+	//
+	// rstStreamPingsBlocked is set after receiving a response to a PING frame
+	// bundled with an RST_STREAM (see pendingResets below), and cleared after
+	// receiving a HEADERS or DATA frame.
+	rstStreamPingsBlocked bool
+
+	// pendingResets is the number of RST_STREAM frames we have sent to the peer,
+	// without confirming that the peer has received them. When we send a RST_STREAM,
+	// we bundle it with a PING frame, unless a PING is already in flight. We count
+	// the reset stream against the connection's concurrency limit until we get
+	// a PING response. This limits the number of requests we'll try to send to a
+	// completely unresponsive connection.
+	pendingResets int
 
 	// reqHeaderMu is a 1-element semaphore channel controlling access to sending new requests.
 	// Write to reqHeaderMu to lock it, read from it to unlock.
@@ -7568,12 +7895,12 @@ type http2clientStream struct {
 	sentHeaders   bool
 
 	// owned by clientConnReadLoop:
-	firstByte    bool  // got the first response byte
-	pastHeaders  bool  // got first MetaHeadersFrame (actual headers)
-	pastTrailers bool  // got optional second MetaHeadersFrame (trailers)
-	num1xx       uint8 // number of 1xx responses seen
-	readClosed   bool  // peer sent an END_STREAM flag
-	readAborted  bool  // read loop reset the stream
+	firstByte       bool  // got the first response byte
+	pastHeaders     bool  // got first MetaHeadersFrame (actual headers)
+	pastTrailers    bool  // got optional second MetaHeadersFrame (trailers)
+	readClosed      bool  // peer sent an END_STREAM flag
+	readAborted     bool  // read loop reset the stream
+	totalHeaderSize int64 // total size of 1xx headers seen
 
 	trailer    Header  // accumulated trailers
 	resTrailer *Header // client's Response.Trailer
@@ -7635,6 +7962,7 @@ func (cs *http2clientStream) closeReqBodyLocked() {
 }
 
 type http2stickyErrWriter struct {
+	group   http2synctestGroupInterface
 	conn    net.Conn
 	timeout time.Duration
 	err     *error
@@ -7644,22 +7972,9 @@ func (sew http2stickyErrWriter) Write(p []byte) (n int, err error) {
 	if *sew.err != nil {
 		return 0, *sew.err
 	}
-	for {
-		if sew.timeout != 0 {
-			sew.conn.SetWriteDeadline(time.Now().Add(sew.timeout))
-		}
-		nn, err := sew.conn.Write(p[n:])
-		n += nn
-		if n < len(p) && nn > 0 && errors.Is(err, os.ErrDeadlineExceeded) {
-			// Keep extending the deadline so long as we're making progress.
-			continue
-		}
-		if sew.timeout != 0 {
-			sew.conn.SetWriteDeadline(time.Time{})
-		}
-		*sew.err = err
-		return n, err
-	}
+	n, err = http2writeWithByteTimeout(sew.group, sew.conn, sew.timeout, p)
+	*sew.err = err
+	return n, err
 }
 
 // noCachedConnError is the concrete type of ErrNoCachedConn, which
@@ -7691,6 +8006,8 @@ type http2RoundTripOpt struct {
 	// no cached connection is available, RoundTripOpt
 	// will return ErrNoCachedConn.
 	OnlyCachedConn bool
+
+	allowHTTP bool // allow http:// URLs
 }
 
 func (t *http2Transport) RoundTrip(req *Request) (*Response, error) {
@@ -7723,7 +8040,14 @@ func http2authorityAddr(scheme string, authority string) (addr string) {
 
 // RoundTripOpt is like RoundTrip, but takes options.
 func (t *http2Transport) RoundTripOpt(req *Request, opt http2RoundTripOpt) (*Response, error) {
-	if !(req.URL.Scheme == "https" || (req.URL.Scheme == "http" && t.AllowHTTP)) {
+	switch req.URL.Scheme {
+	case "https":
+		// Always okay.
+	case "http":
+		if !t.AllowHTTP && !opt.allowHTTP {
+			return nil, errors.New("http2: unencrypted HTTP/2 not enabled")
+		}
+	default:
 		return nil, errors.New("http2: unsupported scheme")
 	}
 
@@ -7734,7 +8058,7 @@ func (t *http2Transport) RoundTripOpt(req *Request, opt http2RoundTripOpt) (*Res
 			t.vlogf("http2: Transport failed to get client conn for %s: %v", addr, err)
 			return nil, err
 		}
-		reused := !atomic.CompareAndSwapUint32(&cc.reused, 0, 1)
+		reused := !atomic.CompareAndSwapUint32(&cc.atomicReused, 0, 1)
 		http2traceGotConn(req, cc, reused)
 		res, err := cc.RoundTrip(req)
 		if err != nil && retry <= 6 {
@@ -7759,6 +8083,22 @@ func (t *http2Transport) RoundTripOpt(req *Request, opt http2RoundTripOpt) (*Res
 				}
 			}
 		}
+		if err == http2errClientConnNotEstablished {
+			// This ClientConn was created recently,
+			// this is the first request to use it,
+			// and the connection is closed and not usable.
+			//
+			// In this state, cc.idleTimer will remove the conn from the pool
+			// when it fires. Stop the timer and remove it here so future requests
+			// won't try to use this connection.
+			//
+			// If the timer has already fired and we're racing it, the redundant
+			// call to MarkDead is harmless.
+			if cc.idleTimer != nil {
+				cc.idleTimer.Stop()
+			}
+			t.connPool().MarkDead(cc)
+		}
 		if err != nil {
 			t.vlogf("RoundTrip failure: %v", err)
 			return nil, err
@@ -7777,9 +8117,10 @@ func (t *http2Transport) CloseIdleConnections() {
 }
 
 var (
-	http2errClientConnClosed    = errors.New("http2: client conn is closed")
-	http2errClientConnUnusable  = errors.New("http2: client conn not usable")
-	http2errClientConnGotGoAway = errors.New("http2: Transport received Server's graceful shutdown GOAWAY")
+	http2errClientConnClosed         = errors.New("http2: client conn is closed")
+	http2errClientConnUnusable       = errors.New("http2: client conn not usable")
+	http2errClientConnNotEstablished = errors.New("http2: client conn could not be established")
+	http2errClientConnGotGoAway      = errors.New("http2: Transport received Server's graceful shutdown GOAWAY")
 )
 
 // shouldRetryRequest is called by RoundTrip when a request fails to get
@@ -7895,44 +8236,38 @@ func (t *http2Transport) expectContinueTimeout() time.Duration {
 	return t.t1.ExpectContinueTimeout
 }
 
-func (t *http2Transport) maxDecoderHeaderTableSize() uint32 {
-	if v := t.MaxDecoderHeaderTableSize; v > 0 {
-		return v
-	}
-	return http2initialHeaderTableSize
-}
-
-func (t *http2Transport) maxEncoderHeaderTableSize() uint32 {
-	if v := t.MaxEncoderHeaderTableSize; v > 0 {
-		return v
-	}
-	return http2initialHeaderTableSize
-}
-
 func (t *http2Transport) NewClientConn(c net.Conn) (*http2ClientConn, error) {
 	return t.newClientConn(c, t.disableKeepAlives())
 }
 
 func (t *http2Transport) newClientConn(c net.Conn, singleUse bool) (*http2ClientConn, error) {
+	conf := http2configFromTransport(t)
 	cc := &http2ClientConn{
-		t:                     t,
-		tconn:                 c,
-		readerDone:            make(chan struct{}),
-		nextStreamID:          1,
-		maxFrameSize:          16 << 10,                         // spec default
-		initialWindowSize:     65535,                            // spec default
-		maxConcurrentStreams:  http2initialMaxConcurrentStreams, // "infinite", per spec. Use a smaller value until we have received server settings.
-		peerMaxHeaderListSize: 0xffffffffffffffff,               // "infinite", per spec. Use 2^64-1 instead.
-		streams:               make(map[uint32]*http2clientStream),
-		singleUse:             singleUse,
-		wantSettingsAck:       true,
-		pings:                 make(map[[8]byte]chan struct{}),
-		reqHeaderMu:           make(chan struct{}, 1),
+		t:                           t,
+		tconn:                       c,
+		readerDone:                  make(chan struct{}),
+		nextStreamID:                1,
+		maxFrameSize:                16 << 10, // spec default
+		initialWindowSize:           65535,    // spec default
+		initialStreamRecvWindowSize: conf.MaxUploadBufferPerStream,
+		maxConcurrentStreams:        http2initialMaxConcurrentStreams, // "infinite", per spec. Use a smaller value until we have received server settings.
+		peerMaxHeaderListSize:       0xffffffffffffffff,               // "infinite", per spec. Use 2^64-1 instead.
+		streams:                     make(map[uint32]*http2clientStream),
+		singleUse:                   singleUse,
+		seenSettingsChan:            make(chan struct{}),
+		wantSettingsAck:             true,
+		readIdleTimeout:             conf.SendPingTimeout,
+		pingTimeout:                 conf.PingTimeout,
+		pings:                       make(map[[8]byte]chan struct{}),
+		reqHeaderMu:                 make(chan struct{}, 1),
+		lastActive:                  t.now(),
 	}
+	var group http2synctestGroupInterface
 	if t.http2transportTestHooks != nil {
 		t.markNewGoroutine()
 		t.http2transportTestHooks.newclientconn(cc)
 		c = cc.tconn
+		group = t.group
 	}
 	if http2VerboseLogs {
 		t.vlogf("http2: Transport creating client conn %p to %v", cc, c.RemoteAddr())
@@ -7944,30 +8279,25 @@ func (t *http2Transport) newClientConn(c net.Conn, singleUse bool) (*http2Client
 	// TODO: adjust this writer size to account for frame size +
 	// MTU + crypto/tls record padding.
 	cc.bw = bufio.NewWriter(http2stickyErrWriter{
+		group:   group,
 		conn:    c,
-		timeout: t.WriteByteTimeout,
+		timeout: conf.WriteByteTimeout,
 		err:     &cc.werr,
 	})
 	cc.br = bufio.NewReader(c)
 	cc.fr = http2NewFramer(cc.bw, cc.br)
-	if t.maxFrameReadSize() != 0 {
-		cc.fr.SetMaxReadFrameSize(t.maxFrameReadSize())
-	}
+	cc.fr.SetMaxReadFrameSize(conf.MaxReadFrameSize)
 	if t.CountError != nil {
 		cc.fr.countError = t.CountError
 	}
-	maxHeaderTableSize := t.maxDecoderHeaderTableSize()
+	maxHeaderTableSize := conf.MaxDecoderHeaderTableSize
 	cc.fr.ReadMetaHeaders = hpack.NewDecoder(maxHeaderTableSize, nil)
 	cc.fr.MaxHeaderListSize = t.maxHeaderListSize()
 
 	cc.henc = hpack.NewEncoder(&cc.hbuf)
-	cc.henc.SetMaxDynamicTableSizeLimit(t.maxEncoderHeaderTableSize())
+	cc.henc.SetMaxDynamicTableSizeLimit(conf.MaxEncoderHeaderTableSize)
 	cc.peerMaxHeaderTableSize = http2initialHeaderTableSize
 
-	if t.AllowHTTP {
-		cc.nextStreamID = 3
-	}
-
 	if cs, ok := c.(http2connectionStater); ok {
 		state := cs.ConnectionState()
 		cc.tlsState = &state
@@ -7975,11 +8305,9 @@ func (t *http2Transport) newClientConn(c net.Conn, singleUse bool) (*http2Client
 
 	initialSettings := []http2Setting{
 		{ID: http2SettingEnablePush, Val: 0},
-		{ID: http2SettingInitialWindowSize, Val: http2transportDefaultStreamFlow},
-	}
-	if max := t.maxFrameReadSize(); max != 0 {
-		initialSettings = append(initialSettings, http2Setting{ID: http2SettingMaxFrameSize, Val: max})
+		{ID: http2SettingInitialWindowSize, Val: uint32(cc.initialStreamRecvWindowSize)},
 	}
+	initialSettings = append(initialSettings, http2Setting{ID: http2SettingMaxFrameSize, Val: conf.MaxReadFrameSize})
 	if max := t.maxHeaderListSize(); max != 0 {
 		initialSettings = append(initialSettings, http2Setting{ID: http2SettingMaxHeaderListSize, Val: max})
 	}
@@ -7989,8 +8317,8 @@ func (t *http2Transport) newClientConn(c net.Conn, singleUse bool) (*http2Client
 
 	cc.bw.Write(http2clientPreface)
 	cc.fr.WriteSettings(initialSettings...)
-	cc.fr.WriteWindowUpdate(0, http2transportDefaultConnFlow)
-	cc.inflow.init(http2transportDefaultConnFlow + http2initialWindowSize)
+	cc.fr.WriteWindowUpdate(0, uint32(conf.MaxUploadBufferPerConnection))
+	cc.inflow.init(conf.MaxUploadBufferPerConnection + http2initialWindowSize)
 	cc.bw.Flush()
 	if cc.werr != nil {
 		cc.Close()
@@ -8008,7 +8336,7 @@ func (t *http2Transport) newClientConn(c net.Conn, singleUse bool) (*http2Client
 }
 
 func (cc *http2ClientConn) healthCheck() {
-	pingTimeout := cc.t.pingTimeout()
+	pingTimeout := cc.pingTimeout
 	// We don't need to periodically ping in the health check, because the readLoop of ClientConn will
 	// trigger the healthCheck again if there is no frame received.
 	ctx, cancel := cc.t.contextWithTimeout(context.Background(), pingTimeout)
@@ -8136,7 +8464,7 @@ func (cc *http2ClientConn) State() http2ClientConnState {
 	return http2ClientConnState{
 		Closed:               cc.closed,
 		Closing:              cc.closing || cc.singleUse || cc.doNotReuse || cc.goAway != nil,
-		StreamsActive:        len(cc.streams),
+		StreamsActive:        len(cc.streams) + cc.pendingResets,
 		StreamsReserved:      cc.streamsReserved,
 		StreamsPending:       cc.pendingRequests,
 		LastIdle:             cc.lastIdle,
@@ -8168,16 +8496,38 @@ func (cc *http2ClientConn) idleStateLocked() (st http2clientConnIdleState) {
 		// writing it.
 		maxConcurrentOkay = true
 	} else {
-		maxConcurrentOkay = int64(len(cc.streams)+cc.streamsReserved+1) <= int64(cc.maxConcurrentStreams)
+		// We can take a new request if the total of
+		//   - active streams;
+		//   - reservation slots for new streams; and
+		//   - streams for which we have sent a RST_STREAM and a PING,
+		//     but received no subsequent frame
+		// is less than the concurrency limit.
+		maxConcurrentOkay = cc.currentRequestCountLocked() < int(cc.maxConcurrentStreams)
 	}
 
 	st.canTakeNewRequest = cc.goAway == nil && !cc.closed && !cc.closing && maxConcurrentOkay &&
 		!cc.doNotReuse &&
 		int64(cc.nextStreamID)+2*int64(cc.pendingRequests) < math.MaxInt32 &&
 		!cc.tooIdleLocked()
+
+	// If this connection has never been used for a request and is closed,
+	// then let it take a request (which will fail).
+	//
+	// This avoids a situation where an error early in a connection's lifetime
+	// goes unreported.
+	if cc.nextStreamID == 1 && cc.streamsReserved == 0 && cc.closed {
+		st.canTakeNewRequest = true
+	}
+
 	return
 }
 
+// currentRequestCountLocked reports the number of concurrency slots currently in use,
+// including active streams, reserved slots, and reset streams waiting for acknowledgement.
+func (cc *http2ClientConn) currentRequestCountLocked() int {
+	return len(cc.streams) + cc.streamsReserved + cc.pendingResets
+}
+
 func (cc *http2ClientConn) canTakeNewRequestLocked() bool {
 	st := cc.idleStateLocked()
 	return st.canTakeNewRequest
@@ -8190,7 +8540,7 @@ func (cc *http2ClientConn) tooIdleLocked() bool {
 	// times are compared based on their wall time. We don't want
 	// to reuse a connection that's been sitting idle during
 	// VM/laptop suspend if monotonic time was also frozen.
-	return cc.idleTimeout != 0 && !cc.lastIdle.IsZero() && time.Since(cc.lastIdle.Round(0)) > cc.idleTimeout
+	return cc.idleTimeout != 0 && !cc.lastIdle.IsZero() && cc.t.timeSince(cc.lastIdle.Round(0)) > cc.idleTimeout
 }
 
 // onIdleTimeout is called from a time.AfterFunc goroutine. It will
@@ -8552,6 +8902,8 @@ func (cs *http2clientStream) doRequest(req *Request, streamf func(*http2clientSt
 	cs.cleanupWriteRequest(err)
 }
 
+var http2errExtendedConnectNotSupported = errors.New("net/http: extended connect not supported by peer")
+
 // writeRequest sends a request.
 //
 // It returns nil after the request is written, the response read,
@@ -8567,12 +8919,31 @@ func (cs *http2clientStream) writeRequest(req *Request, streamf func(*http2clien
 		return err
 	}
 
+	// wait for setting frames to be received, a server can change this value later,
+	// but we just wait for the first settings frame
+	var isExtendedConnect bool
+	if req.Method == "CONNECT" && req.Header.Get(":protocol") != "" {
+		isExtendedConnect = true
+	}
+
 	// Acquire the new-request lock by writing to reqHeaderMu.
 	// This lock guards the critical section covering allocating a new stream ID
 	// (requires mu) and creating the stream (requires wmu).
 	if cc.reqHeaderMu == nil {
 		panic("RoundTrip on uninitialized ClientConn") // for tests
 	}
+	if isExtendedConnect {
+		select {
+		case <-cs.reqCancel:
+			return http2errRequestCanceled
+		case <-ctx.Done():
+			return ctx.Err()
+		case <-cc.seenSettingsChan:
+			if !cc.extendedConnectAllowed {
+				return http2errExtendedConnectNotSupported
+			}
+		}
+	}
 	select {
 	case cc.reqHeaderMu <- struct{}{}:
 	case <-cs.reqCancel:
@@ -8754,6 +9125,7 @@ func (cs *http2clientStream) cleanupWriteRequest(err error) {
 		cs.reqBodyClosed = make(chan struct{})
 	}
 	bodyClosed := cs.reqBodyClosed
+	closeOnIdle := cc.singleUse || cc.doNotReuse || cc.t.disableKeepAlives() || cc.goAway != nil
 	cc.mu.Unlock()
 	if mustCloseBody {
 		cs.reqBody.Close()
@@ -8778,16 +9150,44 @@ func (cs *http2clientStream) cleanupWriteRequest(err error) {
 		if cs.sentHeaders {
 			if se, ok := err.(http2StreamError); ok {
 				if se.Cause != http2errFromPeer {
-					cc.writeStreamReset(cs.ID, se.Code, err)
+					cc.writeStreamReset(cs.ID, se.Code, false, err)
 				}
 			} else {
-				cc.writeStreamReset(cs.ID, http2ErrCodeCancel, err)
+				// We're cancelling an in-flight request.
+				//
+				// This could be due to the server becoming unresponsive.
+				// To avoid sending too many requests on a dead connection,
+				// we let the request continue to consume a concurrency slot
+				// until we can confirm the server is still responding.
+				// We do this by sending a PING frame along with the RST_STREAM
+				// (unless a ping is already in flight).
+				//
+				// For simplicity, we don't bother tracking the PING payload:
+				// We reset cc.pendingResets any time we receive a PING ACK.
+				//
+				// We skip this if the conn is going to be closed on idle,
+				// because it's short lived and will probably be closed before
+				// we get the ping response.
+				ping := false
+				if !closeOnIdle {
+					cc.mu.Lock()
+					// rstStreamPingsBlocked works around a gRPC behavior:
+					// see comment on the field for details.
+					if !cc.rstStreamPingsBlocked {
+						if cc.pendingResets == 0 {
+							ping = true
+						}
+						cc.pendingResets++
+					}
+					cc.mu.Unlock()
+				}
+				cc.writeStreamReset(cs.ID, http2ErrCodeCancel, ping, err)
 			}
 		}
 		cs.bufPipe.CloseWithError(err) // no-op if already closed
 	} else {
 		if cs.sentHeaders && !cs.sentEndStream {
-			cc.writeStreamReset(cs.ID, http2ErrCodeNo, nil)
+			cc.writeStreamReset(cs.ID, http2ErrCodeNo, false, nil)
 		}
 		cs.bufPipe.CloseWithError(http2errRequestCanceled)
 	}
@@ -8809,12 +9209,17 @@ func (cs *http2clientStream) cleanupWriteRequest(err error) {
 // Must hold cc.mu.
 func (cc *http2ClientConn) awaitOpenSlotForStreamLocked(cs *http2clientStream) error {
 	for {
-		cc.lastActive = time.Now()
+		if cc.closed && cc.nextStreamID == 1 && cc.streamsReserved == 0 {
+			// This is the very first request sent to this connection.
+			// Return a fatal error which aborts the retry loop.
+			return http2errClientConnNotEstablished
+		}
+		cc.lastActive = cc.t.now()
 		if cc.closed || !cc.canTakeNewRequestLocked() {
 			return http2errClientConnUnusable
 		}
 		cc.lastIdle = time.Time{}
-		if int64(len(cc.streams)) < int64(cc.maxConcurrentStreams) {
+		if cc.currentRequestCountLocked() < int(cc.maxConcurrentStreams) {
 			return nil
 		}
 		cc.pendingRequests++
@@ -9087,7 +9492,7 @@ func (cs *http2clientStream) awaitFlowControl(maxBytes int) (taken int32, err er
 
 func http2validateHeaders(hdrs Header) string {
 	for k, vv := range hdrs {
-		if !httpguts.ValidHeaderFieldName(k) {
+		if !httpguts.ValidHeaderFieldName(k) && k != ":protocol" {
 			return fmt.Sprintf("name %q", k)
 		}
 		for _, v := range vv {
@@ -9122,8 +9527,17 @@ func (cc *http2ClientConn) encodeHeaders(req *Request, addGzipHeader bool, trail
 		return nil, errors.New("http2: invalid Host header")
 	}
 
+	// isNormalConnect is true if this is a non-extended CONNECT request.
+	isNormalConnect := false
+	protocol := req.Header.Get(":protocol")
+	if req.Method == "CONNECT" && protocol == "" {
+		isNormalConnect = true
+	} else if protocol != "" && req.Method != "CONNECT" {
+		return nil, errors.New("http2: invalid :protocol header in non-CONNECT request")
+	}
+
 	var path string
-	if req.Method != "CONNECT" {
+	if !isNormalConnect {
 		path = req.URL.RequestURI()
 		if !http2validPseudoPath(path) {
 			orig := path
@@ -9160,10 +9574,13 @@ func (cc *http2ClientConn) encodeHeaders(req *Request, addGzipHeader bool, trail
 			m = MethodGet
 		}
 		f(":method", m)
-		if req.Method != "CONNECT" {
+		if !isNormalConnect {
 			f(":path", path)
 			f(":scheme", req.URL.Scheme)
 		}
+		if protocol != "" {
+			f(":protocol", protocol)
+		}
 		if trailers != "" {
 			f("trailer", trailers)
 		}
@@ -9220,6 +9637,9 @@ func (cc *http2ClientConn) encodeHeaders(req *Request, addGzipHeader bool, trail
 					}
 				}
 				continue
+			} else if k == ":protocol" {
+				// :protocol pseudo-header was already sent above.
+				continue
 			}
 
 			for _, v := range vv {
@@ -9341,7 +9761,7 @@ type http2resAndError struct {
 func (cc *http2ClientConn) addStreamLocked(cs *http2clientStream) {
 	cs.flow.add(int32(cc.initialWindowSize))
 	cs.flow.setConnFlow(&cc.flow)
-	cs.inflow.init(http2transportDefaultStreamFlow)
+	cs.inflow.init(cc.initialStreamRecvWindowSize)
 	cs.ID = cc.nextStreamID
 	cc.nextStreamID += 2
 	cc.streams[cs.ID] = cs
@@ -9357,10 +9777,10 @@ func (cc *http2ClientConn) forgetStreamID(id uint32) {
 	if len(cc.streams) != slen-1 {
 		panic("forgetting unknown stream id")
 	}
-	cc.lastActive = time.Now()
+	cc.lastActive = cc.t.now()
 	if len(cc.streams) == 0 && cc.idleTimer != nil {
 		cc.idleTimer.Reset(cc.idleTimeout)
-		cc.lastIdle = time.Now()
+		cc.lastIdle = cc.t.now()
 	}
 	// Wake up writeRequestBody via clientStream.awaitFlowControl and
 	// wake up RoundTrip if there is a pending request.
@@ -9420,7 +9840,6 @@ func http2isEOFOrNetReadError(err error) bool {
 
 func (rl *http2clientConnReadLoop) cleanup() {
 	cc := rl.cc
-	cc.t.connPool().MarkDead(cc)
 	defer cc.closeConn()
 	defer close(cc.readerDone)
 
@@ -9444,6 +9863,24 @@ func (rl *http2clientConnReadLoop) cleanup() {
 	}
 	cc.closed = true
 
+	// If the connection has never been used, and has been open for only a short time,
+	// leave it in the connection pool for a little while.
+	//
+	// This avoids a situation where new connections are constantly created,
+	// added to the pool, fail, and are removed from the pool, without any error
+	// being surfaced to the user.
+	const unusedWaitTime = 5 * time.Second
+	idleTime := cc.t.now().Sub(cc.lastActive)
+	if atomic.LoadUint32(&cc.atomicReused) == 0 && idleTime < unusedWaitTime {
+		cc.idleTimer = cc.t.afterFunc(unusedWaitTime-idleTime, func() {
+			cc.t.connPool().MarkDead(cc)
+		})
+	} else {
+		cc.mu.Unlock() // avoid any deadlocks in MarkDead
+		cc.t.connPool().MarkDead(cc)
+		cc.mu.Lock()
+	}
+
 	for _, cs := range cc.streams {
 		select {
 		case <-cs.peerClosed:
@@ -9487,7 +9924,7 @@ func (cc *http2ClientConn) countReadFrameError(err error) {
 func (rl *http2clientConnReadLoop) run() error {
 	cc := rl.cc
 	gotSettings := false
-	readIdleTimeout := cc.t.ReadIdleTimeout
+	readIdleTimeout := cc.readIdleTimeout
 	var t http2timer
 	if readIdleTimeout != 0 {
 		t = cc.t.afterFunc(readIdleTimeout, cc.healthCheck)
@@ -9501,7 +9938,7 @@ func (rl *http2clientConnReadLoop) run() error {
 			cc.vlogf("http2: Transport readFrame error on conn %p: (%T) %v", cc, err, err)
 		}
 		if se, ok := err.(http2StreamError); ok {
-			if cs := rl.streamByID(se.StreamID); cs != nil {
+			if cs := rl.streamByID(se.StreamID, http2notHeaderOrDataFrame); cs != nil {
 				if se.Cause == nil {
 					se.Cause = cc.fr.errDetail
 				}
@@ -9547,13 +9984,16 @@ func (rl *http2clientConnReadLoop) run() error {
 			if http2VerboseLogs {
 				cc.vlogf("http2: Transport conn %p received error from processing frame %v: %v", cc, http2summarizeFrame(f), err)
 			}
+			if !cc.seenSettings {
+				close(cc.seenSettingsChan)
+			}
 			return err
 		}
 	}
 }
 
 func (rl *http2clientConnReadLoop) processHeaders(f *http2MetaHeadersFrame) error {
-	cs := rl.streamByID(f.StreamID)
+	cs := rl.streamByID(f.StreamID, http2headerOrDataFrame)
 	if cs == nil {
 		// We'd get here if we canceled a request while the
 		// server had its response still in flight. So if this
@@ -9671,15 +10111,34 @@ func (rl *http2clientConnReadLoop) handleResponse(cs *http2clientStream, f *http
 		if f.StreamEnded() {
 			return nil, errors.New("1xx informational response with END_STREAM flag")
 		}
-		cs.num1xx++
-		const max1xxResponses = 5 // arbitrary bound on number of informational responses, same as net/http
-		if cs.num1xx > max1xxResponses {
-			return nil, errors.New("http2: too many 1xx informational responses")
-		}
 		if fn := cs.get1xxTraceFunc(); fn != nil {
+			// If the 1xx response is being delivered to the user,
+			// then they're responsible for limiting the number
+			// of responses.
 			if err := fn(statusCode, textproto.MIMEHeader(header)); err != nil {
 				return nil, err
 			}
+		} else {
+			// If the user didn't examine the 1xx response, then we
+			// limit the size of all 1xx headers.
+			//
+			// This differs a bit from the HTTP/1 implementation, which
+			// limits the size of all 1xx headers plus the final response.
+			// Use the larger limit of MaxHeaderListSize and
+			// net/http.Transport.MaxResponseHeaderBytes.
+			limit := int64(cs.cc.t.maxHeaderListSize())
+			if t1 := cs.cc.t.t1; t1 != nil && t1.MaxResponseHeaderBytes > limit {
+				limit = t1.MaxResponseHeaderBytes
+			}
+			for _, h := range f.Fields {
+				cs.totalHeaderSize += int64(h.Size())
+			}
+			if cs.totalHeaderSize > limit {
+				if http2VerboseLogs {
+					log.Printf("http2: 1xx informational responses too large")
+				}
+				return nil, errors.New("header list too large")
+			}
 		}
 		if statusCode == 100 {
 			http2traceGot100Continue(cs.trace)
@@ -9863,7 +10322,7 @@ func (b http2transportResponseBody) Close() error {
 
 func (rl *http2clientConnReadLoop) processData(f *http2DataFrame) error {
 	cc := rl.cc
-	cs := rl.streamByID(f.StreamID)
+	cs := rl.streamByID(f.StreamID, http2headerOrDataFrame)
 	data := f.Data()
 	if cs == nil {
 		cc.mu.Lock()
@@ -9998,9 +10457,22 @@ func (rl *http2clientConnReadLoop) endStreamError(cs *http2clientStream, err err
 	cs.abortStream(err)
 }
 
-func (rl *http2clientConnReadLoop) streamByID(id uint32) *http2clientStream {
+// Constants passed to streamByID for documentation purposes.
+const (
+	http2headerOrDataFrame    = true
+	http2notHeaderOrDataFrame = false
+)
+
+// streamByID returns the stream with the given id, or nil if no stream has that id.
+// If headerOrData is true, it clears rst.StreamPingsBlocked.
+func (rl *http2clientConnReadLoop) streamByID(id uint32, headerOrData bool) *http2clientStream {
 	rl.cc.mu.Lock()
 	defer rl.cc.mu.Unlock()
+	if headerOrData {
+		// Work around an unfortunate gRPC behavior.
+		// See comment on ClientConn.rstStreamPingsBlocked for details.
+		rl.cc.rstStreamPingsBlocked = false
+	}
 	cs := rl.cc.streams[id]
 	if cs != nil && !cs.readAborted {
 		return cs
@@ -10094,6 +10566,21 @@ func (rl *http2clientConnReadLoop) processSettingsNoWrite(f *http2SettingsFrame)
 		case http2SettingHeaderTableSize:
 			cc.henc.SetMaxDynamicTableSize(s.Val)
 			cc.peerMaxHeaderTableSize = s.Val
+		case http2SettingEnableConnectProtocol:
+			if err := s.Valid(); err != nil {
+				return err
+			}
+			// If the peer wants to send us SETTINGS_ENABLE_CONNECT_PROTOCOL,
+			// we require that it do so in the first SETTINGS frame.
+			//
+			// When we attempt to use extended CONNECT, we wait for the first
+			// SETTINGS frame to see if the server supports it. If we let the
+			// server enable the feature with a later SETTINGS frame, then
+			// users will see inconsistent results depending on whether we've
+			// seen that frame or not.
+			if !cc.seenSettings {
+				cc.extendedConnectAllowed = s.Val == 1
+			}
 		default:
 			cc.vlogf("Unhandled Setting: %v", s)
 		}
@@ -10111,6 +10598,7 @@ func (rl *http2clientConnReadLoop) processSettingsNoWrite(f *http2SettingsFrame)
 			// connection can establish to our default.
 			cc.maxConcurrentStreams = http2defaultMaxConcurrentStreams
 		}
+		close(cc.seenSettingsChan)
 		cc.seenSettings = true
 	}
 
@@ -10119,7 +10607,7 @@ func (rl *http2clientConnReadLoop) processSettingsNoWrite(f *http2SettingsFrame)
 
 func (rl *http2clientConnReadLoop) processWindowUpdate(f *http2WindowUpdateFrame) error {
 	cc := rl.cc
-	cs := rl.streamByID(f.StreamID)
+	cs := rl.streamByID(f.StreamID, http2notHeaderOrDataFrame)
 	if f.StreamID != 0 && cs == nil {
 		return nil
 	}
@@ -10148,7 +10636,7 @@ func (rl *http2clientConnReadLoop) processWindowUpdate(f *http2WindowUpdateFrame
 }
 
 func (rl *http2clientConnReadLoop) processResetStream(f *http2RSTStreamFrame) error {
-	cs := rl.streamByID(f.StreamID)
+	cs := rl.streamByID(f.StreamID, http2notHeaderOrDataFrame)
 	if cs == nil {
 		// TODO: return error if server tries to RST_STREAM an idle stream
 		return nil
@@ -10223,6 +10711,12 @@ func (rl *http2clientConnReadLoop) processPing(f *http2PingFrame) error {
 			close(c)
 			delete(cc.pings, f.Data)
 		}
+		if cc.pendingResets > 0 {
+			// See clientStream.cleanupWriteRequest.
+			cc.pendingResets = 0
+			cc.rstStreamPingsBlocked = true
+			cc.cond.Broadcast()
+		}
 		return nil
 	}
 	cc := rl.cc
@@ -10245,13 +10739,20 @@ func (rl *http2clientConnReadLoop) processPushPromise(f *http2PushPromiseFrame)
 	return http2ConnectionError(http2ErrCodeProtocol)
 }
 
-func (cc *http2ClientConn) writeStreamReset(streamID uint32, code http2ErrCode, err error) {
+// writeStreamReset sends a RST_STREAM frame.
+// When ping is true, it also sends a PING frame with a random payload.
+func (cc *http2ClientConn) writeStreamReset(streamID uint32, code http2ErrCode, ping bool, err error) {
 	// TODO: map err to more interesting error codes, once the
 	// HTTP community comes up with some. But currently for
 	// RST_STREAM there's no equivalent to GOAWAY frame's debug
 	// data, and the error codes are all pretty vague ("cancel").
 	cc.wmu.Lock()
 	cc.fr.WriteRSTStream(streamID, code)
+	if ping {
+		var payload [8]byte
+		rand.Read(payload[:])
+		cc.fr.WritePing(false, payload)
+	}
 	cc.bw.Flush()
 	cc.wmu.Unlock()
 }
@@ -10408,7 +10909,7 @@ func http2traceGotConn(req *Request, cc *http2ClientConn, reused bool) {
 	cc.mu.Lock()
 	ci.WasIdle = len(cc.streams) == 0 && reused
 	if ci.WasIdle && !cc.lastActive.IsZero() {
-		ci.IdleTime = time.Since(cc.lastActive)
+		ci.IdleTime = cc.t.timeSince(cc.lastActive)
 	}
 	cc.mu.Unlock()
 
@@ -10476,6 +10977,27 @@ func (t *http2Transport) dialTLSWithContext(ctx context.Context, network, addr s
 	return tlsCn, nil
 }
 
+const http2nextProtoUnencryptedHTTP2 = "unencrypted_http2"
+
+// unencryptedNetConnFromTLSConn retrieves a net.Conn wrapped in a *tls.Conn.
+//
+// TLSNextProto functions accept a *tls.Conn.
+//
+// When passing an unencrypted HTTP/2 connection to a TLSNextProto function,
+// we pass a *tls.Conn with an underlying net.Conn containing the unencrypted connection.
+// To be extra careful about mistakes (accidentally dropping TLS encryption in a place
+// where we want it), the tls.Conn contains a net.Conn with an UnencryptedNetConn method
+// that returns the actual connection we want to use.
+func http2unencryptedNetConnFromTLSConn(tc *tls.Conn) (net.Conn, error) {
+	conner, ok := tc.NetConn().(interface {
+		UnencryptedNetConn() net.Conn
+	})
+	if !ok {
+		return nil, errors.New("http2: TLS conn unexpectedly found in unencrypted handoff")
+	}
+	return conner.UnencryptedNetConn(), nil
+}
+
 // writeFramer is implemented by any type that is used to write frames.
 type http2writeFramer interface {
 	writeFrame(http2writeContext) error
@@ -10592,6 +11114,18 @@ func (se http2StreamError) writeFrame(ctx http2writeContext) error {
 
 func (se http2StreamError) staysWithinBuffer(max int) bool { return http2frameHeaderLen+4 <= max }
 
+type http2writePing struct {
+	data [8]byte
+}
+
+func (w http2writePing) writeFrame(ctx http2writeContext) error {
+	return ctx.Framer().WritePing(false, w.data)
+}
+
+func (w http2writePing) staysWithinBuffer(max int) bool {
+	return http2frameHeaderLen+len(w.data) <= max
+}
+
 type http2writePingAck struct{ pf *http2PingFrame }
 
 func (w http2writePingAck) writeFrame(ctx http2writeContext) error {
diff --git a/src/net/http/http.go b/src/net/http/http.go
index 6e2259ad..32ff7e20 100644
--- a/src/net/http/http.go
+++ b/src/net/http/http.go
@@ -16,6 +16,67 @@ import (
 	"golang.org/x/net/http/httpguts"
 )
 
+// Protocols is a set of HTTP protocols.
+// The zero value is an empty set of protocols.
+//
+// The supported protocols are:
+//
+//   - HTTP1 is the HTTP/1.0 and HTTP/1.1 protocols.
+//     HTTP1 is supported on both unsecured TCP and secured TLS connections.
+//
+//   - HTTP2 is the HTTP/2 protcol over a TLS connection.
+//
+//   - UnencryptedHTTP2 is the HTTP/2 protocol over an unsecured TCP connection.
+type Protocols struct {
+	bits uint8
+}
+
+const (
+	protoHTTP1 = 1 << iota
+	protoHTTP2
+	protoUnencryptedHTTP2
+)
+
+// HTTP1 reports whether p includes HTTP/1.
+func (p Protocols) HTTP1() bool { return p.bits&protoHTTP1 != 0 }
+
+// SetHTTP1 adds or removes HTTP/1 from p.
+func (p *Protocols) SetHTTP1(ok bool) { p.setBit(protoHTTP1, ok) }
+
+// HTTP2 reports whether p includes HTTP/2.
+func (p Protocols) HTTP2() bool { return p.bits&protoHTTP2 != 0 }
+
+// SetHTTP2 adds or removes HTTP/2 from p.
+func (p *Protocols) SetHTTP2(ok bool) { p.setBit(protoHTTP2, ok) }
+
+// UnencryptedHTTP2 reports whether p includes unencrypted HTTP/2.
+func (p Protocols) UnencryptedHTTP2() bool { return p.bits&protoUnencryptedHTTP2 != 0 }
+
+// SetUnencryptedHTTP2 adds or removes unencrypted HTTP/2 from p.
+func (p *Protocols) SetUnencryptedHTTP2(ok bool) { p.setBit(protoUnencryptedHTTP2, ok) }
+
+func (p *Protocols) setBit(bit uint8, ok bool) {
+	if ok {
+		p.bits |= bit
+	} else {
+		p.bits &^= bit
+	}
+}
+
+func (p Protocols) String() string {
+	var s []string
+	if p.HTTP1() {
+		s = append(s, "HTTP1")
+	}
+	if p.HTTP2() {
+		s = append(s, "HTTP2")
+	}
+	if p.UnencryptedHTTP2() {
+		s = append(s, "UnencryptedHTTP2")
+	}
+	return "{" + strings.Join(s, ",") + "}"
+}
+
 // incomparable is a zero-width, non-comparable type. Adding it to a struct
 // makes that struct also non-comparable, and generally doesn't add
 // any size (as long as it's first).
@@ -163,3 +224,68 @@ type Pusher interface {
 	// is not supported on the underlying connection.
 	Push(target string, opts *PushOptions) error
 }
+
+// HTTP2Config defines HTTP/2 configuration parameters common to
+// both [Transport] and [Server].
+type HTTP2Config struct {
+	// MaxConcurrentStreams optionally specifies the number of
+	// concurrent streams that a peer may have open at a time.
+	// If zero, MaxConcurrentStreams defaults to at least 100.
+	MaxConcurrentStreams int
+
+	// MaxDecoderHeaderTableSize optionally specifies an upper limit for the
+	// size of the header compression table used for decoding headers sent
+	// by the peer.
+	// A valid value is less than 4MiB.
+	// If zero or invalid, a default value is used.
+	MaxDecoderHeaderTableSize int
+
+	// MaxEncoderHeaderTableSize optionally specifies an upper limit for the
+	// header compression table used for sending headers to the peer.
+	// A valid value is less than 4MiB.
+	// If zero or invalid, a default value is used.
+	MaxEncoderHeaderTableSize int
+
+	// MaxReadFrameSize optionally specifies the largest frame
+	// this endpoint is willing to read.
+	// A valid value is between 16KiB and 16MiB, inclusive.
+	// If zero or invalid, a default value is used.
+	MaxReadFrameSize int
+
+	// MaxReceiveBufferPerConnection is the maximum size of the
+	// flow control window for data received on a connection.
+	// A valid value is at least 64KiB and less than 4MiB.
+	// If invalid, a default value is used.
+	MaxReceiveBufferPerConnection int
+
+	// MaxReceiveBufferPerStream is the maximum size of
+	// the flow control window for data received on a stream (request).
+	// A valid value is less than 4MiB.
+	// If zero or invalid, a default value is used.
+	MaxReceiveBufferPerStream int
+
+	// SendPingTimeout is the timeout after which a health check using a ping
+	// frame will be carried out if no frame is received on a connection.
+	// If zero, no health check is performed.
+	SendPingTimeout time.Duration
+
+	// PingTimeout is the timeout after which a connection will be closed
+	// if a response to a ping is not received.
+	// If zero, a default of 15 seconds is used.
+	PingTimeout time.Duration
+
+	// WriteByteTimeout is the timeout after which a connection will be
+	// closed if no data can be written to it. The timeout begins when data is
+	// available to write, and is extended whenever any bytes are written.
+	WriteByteTimeout time.Duration
+
+	// PermitProhibitedCipherSuites, if true, permits the use of
+	// cipher suites prohibited by the HTTP/2 spec.
+	PermitProhibitedCipherSuites bool
+
+	// CountError, if non-nil, is called on HTTP/2 errors.
+	// It is intended to increment a metric for monitoring.
+	// The errType contains only lowercase letters, digits, and underscores
+	// (a-z, 0-9, _).
+	CountError func(errType string)
+}
diff --git a/src/net/http/http_test.go b/src/net/http/http_test.go
index 2e7e024e..5aba3ed5 100644
--- a/src/net/http/http_test.go
+++ b/src/net/http/http_test.go
@@ -12,8 +12,8 @@ import (
 	"io/fs"
 	"net/url"
 	"os"
-	"reflect"
 	"regexp"
+	"slices"
 	"strings"
 	"testing"
 )
@@ -41,7 +41,7 @@ func TestForeachHeaderElement(t *testing.T) {
 		foreachHeaderElement(tt.in, func(v string) {
 			got = append(got, v)
 		})
-		if !reflect.DeepEqual(got, tt.want) {
+		if !slices.Equal(got, tt.want) {
 			t.Errorf("foreachHeaderElement(%q) = %q; want %q", tt.in, got, tt.want)
 		}
 	}
@@ -151,9 +151,7 @@ var forbiddenStringsFunctions = map[string]bool{
 // strings and bytes package functions. HTTP is mostly ASCII based, and doing
 // Unicode-aware case folding or space stripping can introduce vulnerabilities.
 func TestNoUnicodeStrings(t *testing.T) {
-	if !testenv.HasSrc() {
-		t.Skip("source code not available")
-	}
+	testenv.MustHaveSource(t)
 
 	re := regexp.MustCompile(`(strings|bytes).([A-Za-z]+)`)
 	if err := fs.WalkDir(os.DirFS("."), ".", func(path string, d fs.DirEntry, err error) error {
@@ -189,6 +187,28 @@ func TestNoUnicodeStrings(t *testing.T) {
 	}
 }
 
+func TestProtocols(t *testing.T) {
+	var p Protocols
+	if p.HTTP1() {
+		t.Errorf("zero-value protocols: p.HTTP1() = true, want false")
+	}
+	p.SetHTTP1(true)
+	p.SetHTTP2(true)
+	if !p.HTTP1() {
+		t.Errorf("initialized protocols: p.HTTP1() = false, want true")
+	}
+	if !p.HTTP2() {
+		t.Errorf("initialized protocols: p.HTTP2() = false, want true")
+	}
+	p.SetHTTP1(false)
+	if p.HTTP1() {
+		t.Errorf("after unsetting HTTP1: p.HTTP1() = true, want false")
+	}
+	if !p.HTTP2() {
+		t.Errorf("after unsetting HTTP1: p.HTTP2() = false, want true")
+	}
+}
+
 const redirectURL = "/thisaredirect细雪withasciilettersのけぶabcdefghijk.html"
 
 func BenchmarkHexEscapeNonASCII(b *testing.B) {
diff --git a/src/net/http/httputil/reverseproxy.go b/src/net/http/httputil/reverseproxy.go
index 04248d5f..d64d2fc3 100644
--- a/src/net/http/httputil/reverseproxy.go
+++ b/src/net/http/httputil/reverseproxy.go
@@ -739,6 +739,7 @@ func (p *ReverseProxy) handleUpgradeResponse(rw http.ResponseWriter, req *http.R
 	resUpType := upgradeType(res.Header)
 	if !ascii.IsPrint(resUpType) { // We know reqUpType is ASCII, it's checked by the caller.
 		p.getErrorHandler()(rw, req, fmt.Errorf("backend tried to switch to invalid protocol %q", resUpType))
+		return
 	}
 	if !ascii.EqualFold(reqUpType, resUpType) {
 		p.getErrorHandler()(rw, req, fmt.Errorf("backend tried to switch protocol %q when %q was requested", resUpType, reqUpType))
diff --git a/src/net/http/httputil/reverseproxy_test.go b/src/net/http/httputil/reverseproxy_test.go
index eac8b7ec..2f9a5eec 100644
--- a/src/net/http/httputil/reverseproxy_test.go
+++ b/src/net/http/httputil/reverseproxy_test.go
@@ -137,6 +137,7 @@ func TestReverseProxy(t *testing.T) {
 	if g, e := res.Trailer.Get("X-Unannounced-Trailer"), "unannounced_trailer_value"; g != e {
 		t.Errorf("Trailer(X-Unannounced-Trailer) = %q ; want %q", g, e)
 	}
+	res.Body.Close()
 
 	// Test that a backend failing to be reached or one which doesn't return
 	// a response results in a StatusBadGateway.
@@ -205,7 +206,7 @@ func TestReverseProxyStripHeadersPresentInConnection(t *testing.T) {
 		slices.Sort(cf)
 		expectedValues := []string{"Upgrade", someConnHeader, fakeConnectionToken}
 		slices.Sort(expectedValues)
-		if !reflect.DeepEqual(cf, expectedValues) {
+		if !slices.Equal(cf, expectedValues) {
 			t.Errorf("handler modified header %q = %q; want %q", "Connection", cf, expectedValues)
 		}
 	}))
@@ -328,6 +329,7 @@ func TestXForwardedFor(t *testing.T) {
 	if err != nil {
 		t.Fatalf("Get: %v", err)
 	}
+	defer res.Body.Close()
 	if g, e := res.StatusCode, backendStatus; g != e {
 		t.Errorf("got res.StatusCode %d; expected %d", g, e)
 	}
@@ -765,7 +767,7 @@ func TestReverseProxyGetPutBuffer(t *testing.T) {
 	wantLog := []string{"getBuf", "putBuf-" + strconv.Itoa(size)}
 	mu.Lock()
 	defer mu.Unlock()
-	if !reflect.DeepEqual(log, wantLog) {
+	if !slices.Equal(log, wantLog) {
 		t.Errorf("Log events = %q; want %q", log, wantLog)
 	}
 }
@@ -801,6 +803,7 @@ func TestReverseProxy_Post(t *testing.T) {
 	if err != nil {
 		t.Fatalf("Do: %v", err)
 	}
+	defer res.Body.Close()
 	if g, e := res.StatusCode, backendStatus; g != e {
 		t.Errorf("got res.StatusCode %d; expected %d", g, e)
 	}
@@ -1571,7 +1574,7 @@ func TestUnannouncedTrailer(t *testing.T) {
 	}
 
 	io.ReadAll(res.Body)
-
+	res.Body.Close()
 	if g, w := res.Trailer.Get("X-Unannounced-Trailer"), "unannounced_trailer_value"; g != w {
 		t.Errorf("Trailer(X-Unannounced-Trailer) = %q; want %q", g, w)
 	}
diff --git a/src/net/http/netconn_test.go b/src/net/http/netconn_test.go
new file mode 100644
index 00000000..ed02b98d
--- /dev/null
+++ b/src/net/http/netconn_test.go
@@ -0,0 +1,436 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package http_test
+
+import (
+	"bytes"
+	"context"
+	"internal/synctest"
+	"io"
+	"math"
+	"net"
+	"net/netip"
+	"os"
+	"sync"
+	"time"
+)
+
+func fakeNetListen() *fakeNetListener {
+	li := &fakeNetListener{
+		setc:    make(chan struct{}, 1),
+		unsetc:  make(chan struct{}, 1),
+		addr:    netip.MustParseAddrPort("127.0.0.1:8000"),
+		locPort: 10000,
+	}
+	li.unsetc <- struct{}{}
+	return li
+}
+
+type fakeNetListener struct {
+	setc, unsetc chan struct{}
+	queue        []net.Conn
+	closed       bool
+	addr         netip.AddrPort
+	locPort      uint16
+
+	onDial func() // called when making a new connection
+
+	trackConns bool // set this to record all created conns
+	conns      []*fakeNetConn
+}
+
+func (li *fakeNetListener) lock() {
+	select {
+	case <-li.setc:
+	case <-li.unsetc:
+	}
+}
+
+func (li *fakeNetListener) unlock() {
+	if li.closed || len(li.queue) > 0 {
+		li.setc <- struct{}{}
+	} else {
+		li.unsetc <- struct{}{}
+	}
+}
+
+func (li *fakeNetListener) connect() *fakeNetConn {
+	if li.onDial != nil {
+		li.onDial()
+	}
+	li.lock()
+	defer li.unlock()
+	locAddr := netip.AddrPortFrom(netip.AddrFrom4([4]byte{127, 0, 0, 1}), li.locPort)
+	li.locPort++
+	c0, c1 := fakeNetPipe(li.addr, locAddr)
+	li.queue = append(li.queue, c0)
+	if li.trackConns {
+		li.conns = append(li.conns, c0)
+	}
+	return c1
+}
+
+func (li *fakeNetListener) Accept() (net.Conn, error) {
+	<-li.setc
+	defer li.unlock()
+	if li.closed {
+		return nil, net.ErrClosed
+	}
+	c := li.queue[0]
+	li.queue = li.queue[1:]
+	return c, nil
+}
+
+func (li *fakeNetListener) Close() error {
+	li.lock()
+	defer li.unlock()
+	li.closed = true
+	return nil
+}
+
+func (li *fakeNetListener) Addr() net.Addr {
+	return net.TCPAddrFromAddrPort(li.addr)
+}
+
+// fakeNetPipe creates an in-memory, full duplex network connection.
+//
+// Unlike net.Pipe, the connection is not synchronous.
+// Writes are made to a buffer, and return immediately.
+// By default, the buffer size is unlimited.
+func fakeNetPipe(s1ap, s2ap netip.AddrPort) (r, w *fakeNetConn) {
+	s1addr := net.TCPAddrFromAddrPort(s1ap)
+	s2addr := net.TCPAddrFromAddrPort(s2ap)
+	s1 := newSynctestNetConnHalf(s1addr)
+	s2 := newSynctestNetConnHalf(s2addr)
+	c1 := &fakeNetConn{loc: s1, rem: s2}
+	c2 := &fakeNetConn{loc: s2, rem: s1}
+	c1.peer = c2
+	c2.peer = c1
+	return c1, c2
+}
+
+// A fakeNetConn is one endpoint of the connection created by fakeNetPipe.
+type fakeNetConn struct {
+	// local and remote connection halves.
+	// Each half contains a buffer.
+	// Reads pull from the local buffer, and writes push to the remote buffer.
+	loc, rem *fakeNetConnHalf
+
+	// When set, synctest.Wait is automatically called before reads and after writes.
+	autoWait bool
+
+	// peer is the other endpoint.
+	peer *fakeNetConn
+
+	onClose func() // called when closing
+}
+
+// Read reads data from the connection.
+func (c *fakeNetConn) Read(b []byte) (n int, err error) {
+	if c.autoWait {
+		synctest.Wait()
+	}
+	return c.loc.read(b)
+}
+
+// Peek returns the available unread read buffer,
+// without consuming its contents.
+func (c *fakeNetConn) Peek() []byte {
+	if c.autoWait {
+		synctest.Wait()
+	}
+	return c.loc.peek()
+}
+
+// Write writes data to the connection.
+func (c *fakeNetConn) Write(b []byte) (n int, err error) {
+	if c.autoWait {
+		defer synctest.Wait()
+	}
+	return c.rem.write(b)
+}
+
+// IsClosed reports whether the peer has closed its end of the connection.
+func (c *fakeNetConn) IsClosedByPeer() bool {
+	if c.autoWait {
+		synctest.Wait()
+	}
+	c.rem.lock()
+	defer c.rem.unlock()
+	// If the remote half of the conn is returning ErrClosed,
+	// the peer has closed the connection.
+	return c.rem.readErr == net.ErrClosed
+}
+
+// Close closes the connection.
+func (c *fakeNetConn) Close() error {
+	if c.onClose != nil {
+		c.onClose()
+	}
+	// Local half of the conn is now closed.
+	c.loc.lock()
+	c.loc.writeErr = net.ErrClosed
+	c.loc.readErr = net.ErrClosed
+	c.loc.buf.Reset()
+	c.loc.unlock()
+	// Remote half of the connection reads EOF after reading any remaining data.
+	c.rem.lock()
+	if c.rem.readErr != nil {
+		c.rem.readErr = io.EOF
+	}
+	c.rem.unlock()
+	if c.autoWait {
+		synctest.Wait()
+	}
+	return nil
+}
+
+// LocalAddr returns the (fake) local network address.
+func (c *fakeNetConn) LocalAddr() net.Addr {
+	return c.loc.addr
+}
+
+// LocalAddr returns the (fake) remote network address.
+func (c *fakeNetConn) RemoteAddr() net.Addr {
+	return c.rem.addr
+}
+
+// SetDeadline sets the read and write deadlines for the connection.
+func (c *fakeNetConn) SetDeadline(t time.Time) error {
+	c.SetReadDeadline(t)
+	c.SetWriteDeadline(t)
+	return nil
+}
+
+// SetReadDeadline sets the read deadline for the connection.
+func (c *fakeNetConn) SetReadDeadline(t time.Time) error {
+	c.loc.rctx.setDeadline(t)
+	return nil
+}
+
+// SetWriteDeadline sets the write deadline for the connection.
+func (c *fakeNetConn) SetWriteDeadline(t time.Time) error {
+	c.rem.wctx.setDeadline(t)
+	return nil
+}
+
+// SetReadBufferSize sets the read buffer limit for the connection.
+// Writes by the peer will block so long as the buffer is full.
+func (c *fakeNetConn) SetReadBufferSize(size int) {
+	c.loc.setReadBufferSize(size)
+}
+
+// fakeNetConnHalf is one data flow in the connection created by fakeNetPipe.
+// Each half contains a buffer. Writes to the half push to the buffer, and reads pull from it.
+type fakeNetConnHalf struct {
+	addr net.Addr
+
+	// Read and write timeouts.
+	rctx, wctx deadlineContext
+
+	// A half can be readable and/or writable.
+	//
+	// These four channels act as a lock,
+	// and allow waiting for readability/writability.
+	// When the half is unlocked, exactly one channel contains a value.
+	// When the half is locked, all channels are empty.
+	lockr  chan struct{} // readable
+	lockw  chan struct{} // writable
+	lockrw chan struct{} // readable and writable
+	lockc  chan struct{} // neither readable nor writable
+
+	bufMax   int // maximum buffer size
+	buf      bytes.Buffer
+	readErr  error // error returned by reads
+	writeErr error // error returned by writes
+}
+
+func newSynctestNetConnHalf(addr net.Addr) *fakeNetConnHalf {
+	h := &fakeNetConnHalf{
+		addr:   addr,
+		lockw:  make(chan struct{}, 1),
+		lockr:  make(chan struct{}, 1),
+		lockrw: make(chan struct{}, 1),
+		lockc:  make(chan struct{}, 1),
+		bufMax: math.MaxInt, // unlimited
+	}
+	h.unlock()
+	return h
+}
+
+// lock locks h.
+func (h *fakeNetConnHalf) lock() {
+	select {
+	case <-h.lockw: // writable
+	case <-h.lockr: // readable
+	case <-h.lockrw: // readable and writable
+	case <-h.lockc: // neither readable nor writable
+	}
+}
+
+// h unlocks h.
+func (h *fakeNetConnHalf) unlock() {
+	canRead := h.readErr != nil || h.buf.Len() > 0
+	canWrite := h.writeErr != nil || h.bufMax > h.buf.Len()
+	switch {
+	case canRead && canWrite:
+		h.lockrw <- struct{}{} // readable and writable
+	case canRead:
+		h.lockr <- struct{}{} // readable
+	case canWrite:
+		h.lockw <- struct{}{} // writable
+	default:
+		h.lockc <- struct{}{} // neither readable nor writable
+	}
+}
+
+// waitAndLockForRead waits until h is readable and locks it.
+func (h *fakeNetConnHalf) waitAndLockForRead() error {
+	// First a non-blocking select to see if we can make immediate progress.
+	// This permits using a canceled context for a non-blocking operation.
+	select {
+	case <-h.lockr:
+		return nil // readable
+	case <-h.lockrw:
+		return nil // readable and writable
+	default:
+	}
+	ctx := h.rctx.context()
+	select {
+	case <-h.lockr:
+		return nil // readable
+	case <-h.lockrw:
+		return nil // readable and writable
+	case <-ctx.Done():
+		return context.Cause(ctx)
+	}
+}
+
+// waitAndLockForWrite waits until h is writable and locks it.
+func (h *fakeNetConnHalf) waitAndLockForWrite() error {
+	// First a non-blocking select to see if we can make immediate progress.
+	// This permits using a canceled context for a non-blocking operation.
+	select {
+	case <-h.lockw:
+		return nil // writable
+	case <-h.lockrw:
+		return nil // readable and writable
+	default:
+	}
+	ctx := h.wctx.context()
+	select {
+	case <-h.lockw:
+		return nil // writable
+	case <-h.lockrw:
+		return nil // readable and writable
+	case <-ctx.Done():
+		return context.Cause(ctx)
+	}
+}
+
+func (h *fakeNetConnHalf) peek() []byte {
+	h.lock()
+	defer h.unlock()
+	return h.buf.Bytes()
+}
+
+func (h *fakeNetConnHalf) read(b []byte) (n int, err error) {
+	if err := h.waitAndLockForRead(); err != nil {
+		return 0, err
+	}
+	defer h.unlock()
+	if h.buf.Len() == 0 && h.readErr != nil {
+		return 0, h.readErr
+	}
+	return h.buf.Read(b)
+}
+
+func (h *fakeNetConnHalf) setReadBufferSize(size int) {
+	h.lock()
+	defer h.unlock()
+	h.bufMax = size
+}
+
+func (h *fakeNetConnHalf) write(b []byte) (n int, err error) {
+	for n < len(b) {
+		nn, err := h.writePartial(b[n:])
+		n += nn
+		if err != nil {
+			return n, err
+		}
+	}
+	return n, nil
+}
+
+func (h *fakeNetConnHalf) writePartial(b []byte) (n int, err error) {
+	if err := h.waitAndLockForWrite(); err != nil {
+		return 0, err
+	}
+	defer h.unlock()
+	if h.writeErr != nil {
+		return 0, h.writeErr
+	}
+	writeMax := h.bufMax - h.buf.Len()
+	if writeMax < len(b) {
+		b = b[:writeMax]
+	}
+	return h.buf.Write(b)
+}
+
+// deadlineContext converts a changable deadline (as in net.Conn.SetDeadline) into a Context.
+type deadlineContext struct {
+	mu     sync.Mutex
+	ctx    context.Context
+	cancel context.CancelCauseFunc
+	timer  *time.Timer
+}
+
+// context returns a Context which expires when the deadline does.
+func (t *deadlineContext) context() context.Context {
+	t.mu.Lock()
+	defer t.mu.Unlock()
+	if t.ctx == nil {
+		t.ctx, t.cancel = context.WithCancelCause(context.Background())
+	}
+	return t.ctx
+}
+
+// setDeadline sets the current deadline.
+func (t *deadlineContext) setDeadline(deadline time.Time) {
+	t.mu.Lock()
+	defer t.mu.Unlock()
+	// If t.ctx is non-nil and t.cancel is nil, then t.ctx was canceled
+	// and we should create a new one.
+	if t.ctx == nil || t.cancel == nil {
+		t.ctx, t.cancel = context.WithCancelCause(context.Background())
+	}
+	// Stop any existing deadline from expiring.
+	if t.timer != nil {
+		t.timer.Stop()
+	}
+	if deadline.IsZero() {
+		// No deadline.
+		return
+	}
+	now := time.Now()
+	if !deadline.After(now) {
+		// Deadline has already expired.
+		t.cancel(os.ErrDeadlineExceeded)
+		t.cancel = nil
+		return
+	}
+	if t.timer != nil {
+		// Reuse existing deadline timer.
+		t.timer.Reset(deadline.Sub(now))
+		return
+	}
+	// Create a new timer to cancel the context at the deadline.
+	t.timer = time.AfterFunc(deadline.Sub(now), func() {
+		t.mu.Lock()
+		defer t.mu.Unlock()
+		t.cancel(os.ErrDeadlineExceeded)
+		t.cancel = nil
+	})
+}
diff --git a/src/net/http/pprof/pprof.go b/src/net/http/pprof/pprof.go
index cf4b8415..6ba6b2c8 100644
--- a/src/net/http/pprof/pprof.go
+++ b/src/net/http/pprof/pprof.go
@@ -86,7 +86,7 @@ import (
 	"runtime"
 	"runtime/pprof"
 	"runtime/trace"
-	"sort"
+	"slices"
 	"strconv"
 	"strings"
 	"time"
@@ -367,6 +367,7 @@ var profileDescriptions = map[string]string{
 	"heap":         "A sampling of memory allocations of live objects. You can specify the gc GET parameter to run GC before taking the heap sample.",
 	"mutex":        "Stack traces of holders of contended mutexes",
 	"profile":      "CPU profile. You can specify the duration in the seconds GET parameter. After you get the profile file, use the go tool pprof command to investigate the profile.",
+	"symbol":       "Maps given program counters to function names. Counters can be specified in a GET raw query or POST body, multiple counters are separated by '+'.",
 	"threadcreate": "Stack traces that led to the creation of new OS threads",
 	"trace":        "A trace of execution of the current program. You can specify the duration in the seconds GET parameter. After you get the trace file, use the go tool trace command to investigate the trace.",
 }
@@ -404,7 +405,7 @@ func Index(w http.ResponseWriter, r *http.Request) {
 	}
 
 	// Adding other profiles exposed from within this package
-	for _, p := range []string{"cmdline", "profile", "trace"} {
+	for _, p := range []string{"cmdline", "profile", "symbol", "trace"} {
 		profiles = append(profiles, profileEntry{
 			Name: p,
 			Href: p,
@@ -412,8 +413,8 @@ func Index(w http.ResponseWriter, r *http.Request) {
 		})
 	}
 
-	sort.Slice(profiles, func(i, j int) bool {
-		return profiles[i].Name < profiles[j].Name
+	slices.SortFunc(profiles, func(a, b profileEntry) int {
+		return strings.Compare(a.Name, b.Name)
 	})
 
 	if err := indexTmplExecute(w, profiles); err != nil {
diff --git a/src/net/http/request.go b/src/net/http/request.go
index ad1b5a62..434c1640 100644
--- a/src/net/http/request.go
+++ b/src/net/http/request.go
@@ -15,6 +15,7 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"maps"
 	"mime"
 	"mime/multipart"
 	"net/http/httptrace"
@@ -390,12 +391,8 @@ func (r *Request) Clone(ctx context.Context) *Request {
 	*r2 = *r
 	r2.ctx = ctx
 	r2.URL = cloneURL(r.URL)
-	if r.Header != nil {
-		r2.Header = r.Header.Clone()
-	}
-	if r.Trailer != nil {
-		r2.Trailer = r.Trailer.Clone()
-	}
+	r2.Header = r.Header.Clone()
+	r2.Trailer = r.Trailer.Clone()
 	if s := r.TransferEncoding; s != nil {
 		s2 := make([]string, len(s))
 		copy(s2, s)
@@ -411,13 +408,7 @@ func (r *Request) Clone(ctx context.Context) *Request {
 		copy(s2, s)
 		r2.matches = s2
 	}
-	if s := r.otherValues; s != nil {
-		s2 := make(map[string]string, len(s))
-		for k, v := range s {
-			s2[k] = v
-		}
-		r2.otherValues = s2
-	}
+	r2.otherValues = maps.Clone(r.otherValues)
 	return r2
 }
 
@@ -882,9 +873,9 @@ func NewRequest(method, url string, body io.Reader) (*Request, error) {
 //
 // NewRequestWithContext returns a Request suitable for use with
 // [Client.Do] or [Transport.RoundTrip]. To create a request for use with
-// testing a Server Handler, either use the [NewRequest] function in the
-// net/http/httptest package, use [ReadRequest], or manually update the
-// Request fields. For an outgoing client request, the context
+// testing a Server Handler, either use the [net/http/httptest.NewRequest] function,
+// use [ReadRequest], or manually update the Request fields.
+// For an outgoing client request, the context
 // controls the entire lifetime of a request and its response:
 // obtaining a connection, sending the request, and reading the
 // response headers and body. See the Request type's documentation for
diff --git a/src/net/http/request_test.go b/src/net/http/request_test.go
index 9b6eb6e1..37b88831 100644
--- a/src/net/http/request_test.go
+++ b/src/net/http/request_test.go
@@ -23,6 +23,7 @@ import (
 	"os"
 	"reflect"
 	"regexp"
+	"slices"
 	"strings"
 	"testing"
 )
@@ -69,22 +70,22 @@ func TestParseFormQuery(t *testing.T) {
 	if bz := req.PostFormValue("z"); bz != "post" {
 		t.Errorf(`req.PostFormValue("z") = %q, want "post"`, bz)
 	}
-	if qs := req.Form["q"]; !reflect.DeepEqual(qs, []string{"foo", "bar"}) {
+	if qs := req.Form["q"]; !slices.Equal(qs, []string{"foo", "bar"}) {
 		t.Errorf(`req.Form["q"] = %q, want ["foo", "bar"]`, qs)
 	}
-	if both := req.Form["both"]; !reflect.DeepEqual(both, []string{"y", "x"}) {
+	if both := req.Form["both"]; !slices.Equal(both, []string{"y", "x"}) {
 		t.Errorf(`req.Form["both"] = %q, want ["y", "x"]`, both)
 	}
 	if prio := req.FormValue("prio"); prio != "2" {
 		t.Errorf(`req.FormValue("prio") = %q, want "2" (from body)`, prio)
 	}
-	if orphan := req.Form["orphan"]; !reflect.DeepEqual(orphan, []string{"", "nope"}) {
+	if orphan := req.Form["orphan"]; !slices.Equal(orphan, []string{"", "nope"}) {
 		t.Errorf(`req.FormValue("orphan") = %q, want "" (from body)`, orphan)
 	}
-	if empty := req.Form["empty"]; !reflect.DeepEqual(empty, []string{"", "not"}) {
+	if empty := req.Form["empty"]; !slices.Equal(empty, []string{"", "not"}) {
 		t.Errorf(`req.FormValue("empty") = %q, want "" (from body)`, empty)
 	}
-	if nokey := req.Form[""]; !reflect.DeepEqual(nokey, []string{"nokey"}) {
+	if nokey := req.Form[""]; !slices.Equal(nokey, []string{"nokey"}) {
 		t.Errorf(`req.FormValue("nokey") = %q, want "nokey" (from body)`, nokey)
 	}
 }
@@ -765,7 +766,7 @@ func TestRequestWriteBufferedWriter(t *testing.T) {
 		"User-Agent: " + DefaultUserAgent + "\r\n",
 		"\r\n",
 	}
-	if !reflect.DeepEqual(got, want) {
+	if !slices.Equal(got, want) {
 		t.Errorf("Writes = %q\n  Want = %q", got, want)
 	}
 }
@@ -785,7 +786,7 @@ func TestRequestBadHostHeader(t *testing.T) {
 		"User-Agent: " + DefaultUserAgent + "\r\n",
 		"\r\n",
 	}
-	if !reflect.DeepEqual(got, want) {
+	if !slices.Equal(got, want) {
 		t.Errorf("Writes = %q\n  Want = %q", got, want)
 	}
 }
@@ -804,7 +805,7 @@ func TestRequestBadUserAgent(t *testing.T) {
 		"User-Agent: evil  X-Evil: evil\r\n",
 		"\r\n",
 	}
-	if !reflect.DeepEqual(got, want) {
+	if !slices.Equal(got, want) {
 		t.Errorf("Writes = %q\n  Want = %q", got, want)
 	}
 }
diff --git a/src/net/http/response_test.go b/src/net/http/response_test.go
index a63aac95..3ccbb9b0 100644
--- a/src/net/http/response_test.go
+++ b/src/net/http/response_test.go
@@ -21,9 +21,10 @@ import (
 )
 
 type respTest struct {
-	Raw  string
-	Resp Response
-	Body string
+	Raw    string
+	RawOut string
+	Resp   Response
+	Body   string
 }
 
 func dummyReq(method string) *Request {
@@ -42,6 +43,11 @@ var respTests = []respTest{
 			"\r\n" +
 			"Body here\n",
 
+		"HTTP/1.0 200 OK\r\n" +
+			"Connection: close\r\n" +
+			"\r\n" +
+			"Body here\n",
+
 		Response{
 			Status:     "200 OK",
 			StatusCode: 200,
@@ -66,6 +72,11 @@ var respTests = []respTest{
 			"\r\n" +
 			"Body here\n",
 
+		"HTTP/1.1 200 OK\r\n" +
+			"Connection: close\r\n" +
+			"\r\n" +
+			"Body here\n",
+
 		Response{
 			Status:        "200 OK",
 			StatusCode:    200,
@@ -87,6 +98,9 @@ var respTests = []respTest{
 			"\r\n" +
 			"Body should not be read!\n",
 
+		"HTTP/1.1 204 No Content\r\n" +
+			"\r\n",
+
 		Response{
 			Status:        "204 No Content",
 			StatusCode:    204,
@@ -110,6 +124,12 @@ var respTests = []respTest{
 			"\r\n" +
 			"Body here\n",
 
+		"HTTP/1.0 200 OK\r\n" +
+			"Content-Length: 10\r\n" +
+			"Connection: close\r\n" +
+			"\r\n" +
+			"Body here\n",
+
 		Response{
 			Status:     "200 OK",
 			StatusCode: 200,
@@ -140,6 +160,14 @@ var respTests = []respTest{
 			"0\r\n" +
 			"\r\n",
 
+		"HTTP/1.1 200 OK\r\n" +
+			"Transfer-Encoding: chunked\r\n" +
+			"\r\n" +
+			"13\r\n" +
+			"Body here\ncontinued\r\n" +
+			"0\r\n" +
+			"\r\n",
+
 		Response{
 			Status:           "200 OK",
 			StatusCode:       200,
@@ -165,6 +193,12 @@ var respTests = []respTest{
 			"\r\n" +
 			"Body here\n",
 
+		"HTTP/1.0 200 OK\r\n" +
+			"Content-Length: 10\r\n" +
+			"Connection: close\r\n" +
+			"\r\n" +
+			"Body here\n",
+
 		Response{
 			Status:     "200 OK",
 			StatusCode: 200,
@@ -195,6 +229,14 @@ var respTests = []respTest{
 			"0\r\n" +
 			"\r\n",
 
+		"HTTP/1.1 200 OK\r\n" +
+			"Transfer-Encoding: chunked\r\n" +
+			"\r\n" +
+			"a\r\n" +
+			"Body here\n\r\n" +
+			"0\r\n" +
+			"\r\n",
+
 		Response{
 			Status:           "200 OK",
 			StatusCode:       200,
@@ -217,6 +259,10 @@ var respTests = []respTest{
 			"Transfer-Encoding: chunked\r\n" +
 			"\r\n",
 
+		"HTTP/1.1 200 OK\r\n" +
+			"Transfer-Encoding: chunked\r\n" +
+			"\r\n",
+
 		Response{
 			Status:           "200 OK",
 			StatusCode:       200,
@@ -239,6 +285,11 @@ var respTests = []respTest{
 			"Content-Length: 256\r\n" +
 			"\r\n",
 
+		"HTTP/1.0 200 OK\r\n" +
+			"Connection: close\r\n" +
+			"Content-Length: 256\r\n" +
+			"\r\n",
+
 		Response{
 			Status:           "200 OK",
 			StatusCode:       200,
@@ -261,6 +312,10 @@ var respTests = []respTest{
 			"Content-Length: 256\r\n" +
 			"\r\n",
 
+		"HTTP/1.1 200 OK\r\n" +
+			"Content-Length: 256\r\n" +
+			"\r\n",
+
 		Response{
 			Status:           "200 OK",
 			StatusCode:       200,
@@ -282,6 +337,10 @@ var respTests = []respTest{
 		"HTTP/1.0 200 OK\r\n" +
 			"\r\n",
 
+		"HTTP/1.0 200 OK\r\n" +
+			"Connection: close\r\n" +
+			"\r\n",
+
 		Response{
 			Status:           "200 OK",
 			StatusCode:       200,
@@ -304,6 +363,10 @@ var respTests = []respTest{
 			"Content-Length: 0\r\n" +
 			"\r\n",
 
+		"HTTP/1.1 200 OK\r\n" +
+			"Content-Length: 0\r\n" +
+			"\r\n",
+
 		Response{
 			Status:     "200 OK",
 			StatusCode: 200,
@@ -325,6 +388,11 @@ var respTests = []respTest{
 	// (permitted by RFC 7230, section 3.1.2)
 	{
 		"HTTP/1.0 303 \r\n\r\n",
+
+		"HTTP/1.0 303 \r\n" +
+			"Connection: close\r\n" +
+			"\r\n",
+
 		Response{
 			Status:        "303 ",
 			StatusCode:    303,
@@ -344,6 +412,11 @@ var respTests = []respTest{
 	// (not permitted by RFC 7230, but we'll accept it anyway)
 	{
 		"HTTP/1.0 303\r\n\r\n",
+
+		"HTTP/1.0 303 303\r\n" +
+			"Connection: close\r\n" +
+			"\r\n",
+
 		Response{
 			Status:        "303",
 			StatusCode:    303,
@@ -366,6 +439,13 @@ Connection: close
 Content-Type: multipart/byteranges; boundary=18a75608c8f47cef
 
 some body`,
+
+		"HTTP/1.1 206 Partial Content\r\n" +
+			"Connection: close\r\n" +
+			"Content-Type: multipart/byteranges; boundary=18a75608c8f47cef\r\n" +
+			"\r\n" +
+			"some body",
+
 		Response{
 			Status:     "206 Partial Content",
 			StatusCode: 206,
@@ -390,6 +470,11 @@ some body`,
 			"\r\n" +
 			"Body here\n",
 
+		"HTTP/1.0 200 OK\r\n" +
+			"Connection: close\r\n" +
+			"\r\n" +
+			"Body here\n",
+
 		Response{
 			Status:     "200 OK",
 			StatusCode: 200,
@@ -415,6 +500,14 @@ some body`,
 			"Content-Length: 6\r\n\r\n" +
 			"foobar",
 
+		"HTTP/1.1 206 Partial Content\r\n" +
+			"Content-Length: 6\r\n" +
+			"Accept-Ranges: bytes\r\n" +
+			"Content-Range: bytes 0-5/1862\r\n" +
+			"Content-Type: text/plain; charset=utf-8\r\n" +
+			"\r\n" +
+			"foobar",
+
 		Response{
 			Status:     "206 Partial Content",
 			StatusCode: 206,
@@ -441,6 +534,11 @@ some body`,
 			"Connection: keep-alive, close\r\n" +
 			"\r\n",
 
+		"HTTP/1.1 200 OK\r\n" +
+			"Connection: close\r\n" +
+			"Content-Length: 256\r\n" +
+			"\r\n",
+
 		Response{
 			Status:     "200 OK",
 			StatusCode: 200,
@@ -467,6 +565,11 @@ some body`,
 			"Connection: close\r\n" +
 			"\r\n",
 
+		"HTTP/1.1 200 OK\r\n" +
+			"Connection: close\r\n" +
+			"Content-Length: 256\r\n" +
+			"\r\n",
+
 		Response{
 			Status:     "200 OK",
 			StatusCode: 200,
@@ -493,6 +596,11 @@ some body`,
 			"\r\n" +
 			"Body here\n",
 
+		"HTTP/1.0 200 OK\r\n" +
+			"Connection: close\r\n" +
+			"\r\n" +
+			"Body here\n",
+
 		Response{
 			Status:        "200 OK",
 			StatusCode:    200,
@@ -517,6 +625,12 @@ some body`,
 			"\r\n" +
 			"Body here\n",
 
+		"HTTP/1.0 200 OK\r\n" +
+			"Connection: close\r\n" +
+			"Content-Length: 10\r\n" +
+			"\r\n" +
+			"Body here\n",
+
 		Response{
 			Status:     "200 OK",
 			StatusCode: 200,
@@ -541,6 +655,14 @@ some body`,
 			"Connection: keep-alive\r\n" +
 			"Keep-Alive: timeout=7200\r\n\r\n" +
 			"\x1f\x8b\b\x00\x00\x00\x00\x00\x00\x00s\xf3\xf7\a\x00\xab'\xd4\x1a\x03\x00\x00\x00",
+
+		"HTTP/1.1 200 OK\r\n" +
+			"Content-Length: 23\r\n" +
+			"Connection: keep-alive\r\n" +
+			"Content-Encoding: gzip\r\n" +
+			"Keep-Alive: timeout=7200\r\n\r\n" +
+			"\x1f\x8b\b\x00\x00\x00\x00\x00\x00\x00s\xf3\xf7\a\x00\xab'\xd4\x1a\x03\x00\x00\x00",
+
 		Response{
 			Status:     "200 OK",
 			StatusCode: 200,
@@ -566,6 +688,14 @@ some body`,
 			"Content-type: text/html\r\n" +
 			"WWW-Authenticate: Basic realm=\"\"\r\n\r\n" +
 			"Your Authentication failed.\r\n",
+
+		"HTTP/1.0 401 Unauthorized\r\n" +
+			"Connection: close\r\n" +
+			"Content-Type: text/html\r\n" +
+			"Www-Authenticate: Basic realm=\"\"\r\n" +
+			"\r\n" +
+			"Your Authentication failed.\r\n",
+
 		Response{
 			Status:     "401 Unauthorized",
 			StatusCode: 401,
@@ -619,11 +749,18 @@ func TestWriteResponse(t *testing.T) {
 			t.Errorf("#%d: %v", i, err)
 			continue
 		}
-		err = resp.Write(io.Discard)
+		var buf bytes.Buffer
+		err = resp.Write(&buf)
 		if err != nil {
 			t.Errorf("#%d: %v", i, err)
 			continue
 		}
+		if got, want := buf.String(), tt.RawOut; got != want {
+			t.Errorf("#%d: response differs; got:\n----\n%v\n----\nwant:\n----\n%v\n----\n",
+				i,
+				strings.ReplaceAll(got, "\r", "\\r"),
+				strings.ReplaceAll(want, "\r", "\\r"))
+		}
 	}
 }
 
diff --git a/src/net/http/serve_test.go b/src/net/http/serve_test.go
index b2858ba8..0c46b1ec 100644
--- a/src/net/http/serve_test.go
+++ b/src/net/http/serve_test.go
@@ -16,6 +16,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"internal/synctest"
 	"internal/testenv"
 	"io"
 	"log"
@@ -34,6 +35,7 @@ import (
 	"reflect"
 	"regexp"
 	"runtime"
+	"slices"
 	"strconv"
 	"strings"
 	"sync"
@@ -1509,7 +1511,7 @@ func testHeadResponses(t *testing.T, mode testMode) {
 		}
 
 		// Also exercise the ReaderFrom path
-		_, err = io.Copy(w, strings.NewReader("789a"))
+		_, err = io.Copy(w, struct{ io.Reader }{strings.NewReader("789a")})
 		if err != nil {
 			t.Errorf("Copy(ResponseWriter, ...): %v", err)
 		}
@@ -1536,6 +1538,34 @@ func testHeadResponses(t *testing.T, mode testMode) {
 	}
 }
 
+// Ensure ResponseWriter.ReadFrom doesn't write a body in response to a HEAD request.
+// https://go.dev/issue/68609
+func TestHeadReaderFrom(t *testing.T) { run(t, testHeadReaderFrom, []testMode{http1Mode}) }
+func testHeadReaderFrom(t *testing.T, mode testMode) {
+	// Body is large enough to exceed the content-sniffing length.
+	wantBody := strings.Repeat("a", 4096)
+	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
+		w.(io.ReaderFrom).ReadFrom(strings.NewReader(wantBody))
+	}))
+	res, err := cst.c.Head(cst.ts.URL)
+	if err != nil {
+		t.Fatal(err)
+	}
+	res.Body.Close()
+	res, err = cst.c.Get(cst.ts.URL)
+	if err != nil {
+		t.Fatal(err)
+	}
+	gotBody, err := io.ReadAll(res.Body)
+	res.Body.Close()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if string(gotBody) != wantBody {
+		t.Errorf("got unexpected body len=%v, want %v", len(gotBody), len(wantBody))
+	}
+}
+
 func TestTLSHandshakeTimeout(t *testing.T) {
 	run(t, testTLSHandshakeTimeout, []testMode{https1Mode, http2Mode})
 }
@@ -4010,7 +4040,7 @@ func testHTTP10ConnectionHeader(t *testing.T, mode testMode) {
 		resp.Body.Close()
 
 		got := resp.Header["Connection"]
-		if !reflect.DeepEqual(got, tt.expect) {
+		if !slices.Equal(got, tt.expect) {
 			t.Errorf("wrong Connection headers for request %q. Got %q expect %q", tt.req, got, tt.expect)
 		}
 	}
@@ -4329,7 +4359,7 @@ func testServerConnState(t *testing.T, mode testMode) {
 
 		<-complete
 		sl := <-activeLog
-		if !reflect.DeepEqual(sl.got, sl.want) {
+		if !slices.Equal(sl.got, sl.want) {
 			t.Errorf("Request(s) produced unexpected state sequence.\nGot:  %v\nWant: %v", sl.got, sl.want)
 		}
 		// Don't return sl to activeLog: we don't expect any further states after
@@ -4355,7 +4385,7 @@ func testServerConnState(t *testing.T, mode testMode) {
 				return
 			}
 			sl.got = append(sl.got, state)
-			if sl.complete != nil && (len(sl.got) >= len(sl.want) || !reflect.DeepEqual(sl.got, sl.want[:len(sl.got)])) {
+			if sl.complete != nil && (len(sl.got) >= len(sl.want) || !slices.Equal(sl.got, sl.want[:len(sl.got)])) {
 				close(sl.complete)
 				sl.complete = nil
 			}
@@ -5776,70 +5806,59 @@ func testServerShutdown(t *testing.T, mode testMode) {
 	}
 }
 
-func TestServerShutdownStateNew(t *testing.T) { run(t, testServerShutdownStateNew) }
-func testServerShutdownStateNew(t *testing.T, mode testMode) {
+func TestServerShutdownStateNew(t *testing.T) { runSynctest(t, testServerShutdownStateNew) }
+func testServerShutdownStateNew(t testing.TB, mode testMode) {
 	if testing.Short() {
 		t.Skip("test takes 5-6 seconds; skipping in short mode")
 	}
 
-	var connAccepted sync.WaitGroup
+	listener := fakeNetListen()
+	defer listener.Close()
+
 	ts := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
 		// nothing.
 	}), func(ts *httptest.Server) {
-		ts.Config.ConnState = func(conn net.Conn, state ConnState) {
-			if state == StateNew {
-				connAccepted.Done()
-			}
-		}
+		ts.Listener.Close()
+		ts.Listener = listener
+		// Ignore irrelevant error about TLS handshake failure.
+		ts.Config.ErrorLog = log.New(io.Discard, "", 0)
 	}).ts
 
 	// Start a connection but never write to it.
-	connAccepted.Add(1)
-	c, err := net.Dial("tcp", ts.Listener.Addr().String())
-	if err != nil {
-		t.Fatal(err)
-	}
+	c := listener.connect()
 	defer c.Close()
+	synctest.Wait()
 
-	// Wait for the connection to be accepted by the server. Otherwise, if
-	// Shutdown happens to run first, the server will be closed when
-	// encountering the connection, in which case it will be rejected
-	// immediately.
-	connAccepted.Wait()
-
-	shutdownRes := make(chan error, 1)
-	go func() {
-		shutdownRes <- ts.Config.Shutdown(context.Background())
-	}()
-	readRes := make(chan error, 1)
-	go func() {
-		_, err := c.Read([]byte{0})
-		readRes <- err
-	}()
+	shutdownRes := runAsync(func() (struct{}, error) {
+		return struct{}{}, ts.Config.Shutdown(context.Background())
+	})
 
 	// TODO(#59037): This timeout is hard-coded in closeIdleConnections.
 	// It is undocumented, and some users may find it surprising.
 	// Either document it, or switch to a less surprising behavior.
 	const expectTimeout = 5 * time.Second
 
-	t0 := time.Now()
-	select {
-	case got := <-shutdownRes:
-		d := time.Since(t0)
-		if got != nil {
-			t.Fatalf("shutdown error after %v: %v", d, err)
-		}
-		if d < expectTimeout/2 {
-			t.Errorf("shutdown too soon after %v", d)
-		}
-	case <-time.After(expectTimeout * 3 / 2):
-		t.Fatalf("timeout waiting for shutdown")
+	// Wait until just before the expected timeout.
+	time.Sleep(expectTimeout - 1)
+	synctest.Wait()
+	if shutdownRes.done() {
+		t.Fatal("shutdown too soon")
+	}
+	if c.IsClosedByPeer() {
+		t.Fatal("connection was closed by server too soon")
 	}
 
-	// Wait for c.Read to unblock; should be already done at this point,
-	// or within a few milliseconds.
-	if err := <-readRes; err == nil {
-		t.Error("expected error from Read")
+	// closeIdleConnections isn't precise about its actual shutdown time.
+	// Wait long enough for it to definitely have shut down.
+	//
+	// (It would be good to make closeIdleConnections less sloppy.)
+	time.Sleep(2 * time.Second)
+	synctest.Wait()
+	if _, err := shutdownRes.result(); err != nil {
+		t.Fatalf("Shutdown() = %v, want complete", err)
+	}
+	if !c.IsClosedByPeer() {
+		t.Fatalf("connection was not closed by server after shutdown")
 	}
 }
 
diff --git a/src/net/http/server.go b/src/net/http/server.go
index 1ff72a04..1e8e1437 100644
--- a/src/net/http/server.go
+++ b/src/net/http/server.go
@@ -611,7 +611,7 @@ func (w *response) ReadFrom(src io.Reader) (n int64, err error) {
 	w.cw.flush() // make sure Header is written; flush data to rwc
 
 	// Now that cw has been flushed, its chunking field is guaranteed initialized.
-	if !w.cw.chunking && w.bodyAllowed() {
+	if !w.cw.chunking && w.bodyAllowed() && w.req.Method != "HEAD" {
 		n0, err := rf.ReadFrom(src)
 		n += n0
 		w.written += n0
@@ -628,9 +628,9 @@ func (w *response) ReadFrom(src io.Reader) (n int64, err error) {
 const debugServerConnections = false
 
 // Create new connection from rwc.
-func (srv *Server) newConn(rwc net.Conn) *conn {
+func (s *Server) newConn(rwc net.Conn) *conn {
 	c := &conn{
-		server: srv,
+		server: s,
 		rwc:    rwc,
 	}
 	if debugServerConnections {
@@ -915,15 +915,15 @@ func putBufioWriter(bw *bufio.Writer) {
 // This can be overridden by setting [Server.MaxHeaderBytes].
 const DefaultMaxHeaderBytes = 1 << 20 // 1 MB
 
-func (srv *Server) maxHeaderBytes() int {
-	if srv.MaxHeaderBytes > 0 {
-		return srv.MaxHeaderBytes
+func (s *Server) maxHeaderBytes() int {
+	if s.MaxHeaderBytes > 0 {
+		return s.MaxHeaderBytes
 	}
 	return DefaultMaxHeaderBytes
 }
 
-func (srv *Server) initialReadLimitSize() int64 {
-	return int64(srv.maxHeaderBytes()) + 4096 // bufio slop
+func (s *Server) initialReadLimitSize() int64 {
+	return int64(s.maxHeaderBytes()) + 4096 // bufio slop
 }
 
 // tlsHandshakeTimeout returns the time limit permitted for the TLS
@@ -931,12 +931,12 @@ func (srv *Server) initialReadLimitSize() int64 {
 //
 // It returns the minimum of any positive ReadHeaderTimeout,
 // ReadTimeout, or WriteTimeout.
-func (srv *Server) tlsHandshakeTimeout() time.Duration {
+func (s *Server) tlsHandshakeTimeout() time.Duration {
 	var ret time.Duration
 	for _, v := range [...]time.Duration{
-		srv.ReadHeaderTimeout,
-		srv.ReadTimeout,
-		srv.WriteTimeout,
+		s.ReadHeaderTimeout,
+		s.ReadTimeout,
+		s.WriteTimeout,
 	} {
 		if v <= 0 {
 			continue
@@ -2013,6 +2013,16 @@ func (c *conn) serve(ctx context.Context) {
 	c.bufr = newBufioReader(c.r)
 	c.bufw = newBufioWriterSize(checkConnErrorWriter{c}, 4<<10)
 
+	protos := c.server.protocols()
+	if c.tlsState == nil && protos.UnencryptedHTTP2() {
+		if c.maybeServeUnencryptedHTTP2(ctx) {
+			return
+		}
+	}
+	if !protos.HTTP1() {
+		return
+	}
+
 	for {
 		w, err := c.readRequest(ctx)
 		if c.r.remain != c.server.initialReadLimitSize() {
@@ -2132,6 +2142,70 @@ func (c *conn) serve(ctx context.Context) {
 	}
 }
 
+// unencryptedHTTP2Request is an HTTP handler that initializes
+// certain uninitialized fields in its *Request.
+//
+// It's the unencrypted version of initALPNRequest.
+type unencryptedHTTP2Request struct {
+	ctx context.Context
+	c   net.Conn
+	h   serverHandler
+}
+
+func (h unencryptedHTTP2Request) BaseContext() context.Context { return h.ctx }
+
+func (h unencryptedHTTP2Request) ServeHTTP(rw ResponseWriter, req *Request) {
+	if req.Body == nil {
+		req.Body = NoBody
+	}
+	if req.RemoteAddr == "" {
+		req.RemoteAddr = h.c.RemoteAddr().String()
+	}
+	h.h.ServeHTTP(rw, req)
+}
+
+// unencryptedNetConnInTLSConn is used to pass an unencrypted net.Conn to
+// functions that only accept a *tls.Conn.
+type unencryptedNetConnInTLSConn struct {
+	net.Conn // panic on all net.Conn methods
+	conn     net.Conn
+}
+
+func (c unencryptedNetConnInTLSConn) UnencryptedNetConn() net.Conn {
+	return c.conn
+}
+
+func unencryptedTLSConn(c net.Conn) *tls.Conn {
+	return tls.Client(unencryptedNetConnInTLSConn{conn: c}, nil)
+}
+
+// TLSNextProto key to use for unencrypted HTTP/2 connections.
+// Not actually a TLS-negotiated protocol.
+const nextProtoUnencryptedHTTP2 = "unencrypted_http2"
+
+func (c *conn) maybeServeUnencryptedHTTP2(ctx context.Context) bool {
+	fn, ok := c.server.TLSNextProto[nextProtoUnencryptedHTTP2]
+	if !ok {
+		return false
+	}
+	hasPreface := func(c *conn, preface []byte) bool {
+		c.r.setReadLimit(int64(len(preface)) - int64(c.bufr.Buffered()))
+		got, err := c.bufr.Peek(len(preface))
+		c.r.setInfiniteReadLimit()
+		return err == nil && bytes.Equal(got, preface)
+	}
+	if !hasPreface(c, []byte("PRI * HTTP/2.0")) {
+		return false
+	}
+	if !hasPreface(c, []byte("PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n")) {
+		return false
+	}
+	c.setState(c.rwc, StateActive, skipHooks)
+	h := unencryptedHTTP2Request{ctx, c.rwc, serverHandler{c.server}}
+	fn(c.server, unencryptedTLSConn(c.rwc), h)
+	return true
+}
+
 func (w *response) sendExpectationFailed() {
 	// TODO(bradfitz): let ServeHTTP handlers handle
 	// requests with non-standard expectation[s]? Seems
@@ -2480,6 +2554,8 @@ func RedirectHandler(url string, code int) Handler {
 // ServeMux also takes care of sanitizing the URL request path and the Host
 // header, stripping the port number and redirecting any request containing . or
 // .. segments or repeated slashes to an equivalent, cleaner URL.
+// Escaped path elements such as "%2e" for "." and "%2f" for "/" are preserved
+// and aren't considered separators for request routing.
 //
 // # Compatibility
 //
@@ -2503,11 +2579,10 @@ func RedirectHandler(url string, code int) Handler {
 //     This change mostly affects how paths with %2F escapes adjacent to slashes are treated.
 //     See https://go.dev/issue/21955 for details.
 type ServeMux struct {
-	mu       sync.RWMutex
-	tree     routingNode
-	index    routingIndex
-	patterns []*pattern  // TODO(jba): remove if possible
-	mux121   serveMux121 // used only when GODEBUG=httpmuxgo121=1
+	mu     sync.RWMutex
+	tree   routingNode
+	index  routingIndex
+	mux121 serveMux121 // used only when GODEBUG=httpmuxgo121=1
 }
 
 // NewServeMux allocates and returns a new [ServeMux].
@@ -2838,7 +2913,6 @@ func (mux *ServeMux) registerErr(patstr string, handler Handler) error {
 	}
 	mux.tree.addPattern(pat, handler)
 	mux.index.addPattern(pat)
-	mux.patterns = append(mux.patterns, pat)
 	return nil
 }
 
@@ -2973,6 +3047,23 @@ type Server struct {
 	// value.
 	ConnContext func(ctx context.Context, c net.Conn) context.Context
 
+	// HTTP2 configures HTTP/2 connections.
+	//
+	// This field does not yet have any effect.
+	// See https://go.dev/issue/67813.
+	HTTP2 *HTTP2Config
+
+	// Protocols is the set of protocols accepted by the server.
+	//
+	// If Protocols includes UnencryptedHTTP2, the server will accept
+	// unencrypted HTTP/2 connections. The server can serve both
+	// HTTP/1 and unencrypted HTTP/2 on the same address and port.
+	//
+	// If Protocols is nil, the default is usually HTTP/1 and HTTP/2.
+	// If TLSNextProto is non-nil and does not contain an "h2" entry,
+	// the default is HTTP/1 only.
+	Protocols *Protocols
+
 	inShutdown atomic.Bool // true when server is in shutdown
 
 	disableKeepAlives atomic.Bool
@@ -2996,23 +3087,23 @@ type Server struct {
 //
 // Close returns any error returned from closing the [Server]'s
 // underlying Listener(s).
-func (srv *Server) Close() error {
-	srv.inShutdown.Store(true)
-	srv.mu.Lock()
-	defer srv.mu.Unlock()
-	err := srv.closeListenersLocked()
+func (s *Server) Close() error {
+	s.inShutdown.Store(true)
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	err := s.closeListenersLocked()
 
-	// Unlock srv.mu while waiting for listenerGroup.
-	// The group Add and Done calls are made with srv.mu held,
+	// Unlock s.mu while waiting for listenerGroup.
+	// The group Add and Done calls are made with s.mu held,
 	// to avoid adding a new listener in the window between
 	// us setting inShutdown above and waiting here.
-	srv.mu.Unlock()
-	srv.listenerGroup.Wait()
-	srv.mu.Lock()
+	s.mu.Unlock()
+	s.listenerGroup.Wait()
+	s.mu.Lock()
 
-	for c := range srv.activeConn {
+	for c := range s.activeConn {
 		c.rwc.Close()
-		delete(srv.activeConn, c)
+		delete(s.activeConn, c)
 	}
 	return err
 }
@@ -3046,16 +3137,16 @@ const shutdownPollIntervalMax = 500 * time.Millisecond
 //
 // Once Shutdown has been called on a server, it may not be reused;
 // future calls to methods such as Serve will return ErrServerClosed.
-func (srv *Server) Shutdown(ctx context.Context) error {
-	srv.inShutdown.Store(true)
+func (s *Server) Shutdown(ctx context.Context) error {
+	s.inShutdown.Store(true)
 
-	srv.mu.Lock()
-	lnerr := srv.closeListenersLocked()
-	for _, f := range srv.onShutdown {
+	s.mu.Lock()
+	lnerr := s.closeListenersLocked()
+	for _, f := range s.onShutdown {
 		go f()
 	}
-	srv.mu.Unlock()
-	srv.listenerGroup.Wait()
+	s.mu.Unlock()
+	s.listenerGroup.Wait()
 
 	pollIntervalBase := time.Millisecond
 	nextPollInterval := func() time.Duration {
@@ -3072,7 +3163,7 @@ func (srv *Server) Shutdown(ctx context.Context) error {
 	timer := time.NewTimer(nextPollInterval())
 	defer timer.Stop()
 	for {
-		if srv.closeIdleConns() {
+		if s.closeIdleConns() {
 			return lnerr
 		}
 		select {
@@ -3089,10 +3180,10 @@ func (srv *Server) Shutdown(ctx context.Context) error {
 // undergone ALPN protocol upgrade or that have been hijacked.
 // This function should start protocol-specific graceful shutdown,
 // but should not wait for shutdown to complete.
-func (srv *Server) RegisterOnShutdown(f func()) {
-	srv.mu.Lock()
-	srv.onShutdown = append(srv.onShutdown, f)
-	srv.mu.Unlock()
+func (s *Server) RegisterOnShutdown(f func()) {
+	s.mu.Lock()
+	s.onShutdown = append(s.onShutdown, f)
+	s.mu.Unlock()
 }
 
 // closeIdleConns closes all idle connections and reports whether the
@@ -3236,19 +3327,19 @@ func AllowQuerySemicolons(h Handler) Handler {
 	})
 }
 
-// ListenAndServe listens on the TCP network address srv.Addr and then
+// ListenAndServe listens on the TCP network address s.Addr and then
 // calls [Serve] to handle requests on incoming connections.
 // Accepted connections are configured to enable TCP keep-alives.
 //
-// If srv.Addr is blank, ":http" is used.
+// If s.Addr is blank, ":http" is used.
 //
 // ListenAndServe always returns a non-nil error. After [Server.Shutdown] or [Server.Close],
 // the returned error is [ErrServerClosed].
-func (srv *Server) ListenAndServe() error {
-	if srv.shuttingDown() {
+func (s *Server) ListenAndServe() error {
+	if s.shuttingDown() {
 		return ErrServerClosed
 	}
-	addr := srv.Addr
+	addr := s.Addr
 	if addr == "" {
 		addr = ":http"
 	}
@@ -3256,23 +3347,26 @@ func (srv *Server) ListenAndServe() error {
 	if err != nil {
 		return err
 	}
-	return srv.Serve(ln)
+	return s.Serve(ln)
 }
 
 var testHookServerServe func(*Server, net.Listener) // used if non-nil
 
 // shouldConfigureHTTP2ForServe reports whether Server.Serve should configure
-// automatic HTTP/2. (which sets up the srv.TLSNextProto map)
-func (srv *Server) shouldConfigureHTTP2ForServe() bool {
-	if srv.TLSConfig == nil {
+// automatic HTTP/2. (which sets up the s.TLSNextProto map)
+func (s *Server) shouldConfigureHTTP2ForServe() bool {
+	if s.TLSConfig == nil {
 		// Compatibility with Go 1.6:
 		// If there's no TLSConfig, it's possible that the user just
 		// didn't set it on the http.Server, but did pass it to
 		// tls.NewListener and passed that listener to Serve.
-		// So we should configure HTTP/2 (to set up srv.TLSNextProto)
+		// So we should configure HTTP/2 (to set up s.TLSNextProto)
 		// in case the listener returns an "h2" *tls.Conn.
 		return true
 	}
+	if s.protocols().UnencryptedHTTP2() {
+		return true
+	}
 	// The user specified a TLSConfig on their http.Server.
 	// In this, case, only configure HTTP/2 if their tls.Config
 	// explicitly mentions "h2". Otherwise http2.ConfigureServer
@@ -3280,7 +3374,7 @@ func (srv *Server) shouldConfigureHTTP2ForServe() bool {
 	// passed this tls.Config to tls.NewListener. And if they did,
 	// it's too late anyway to fix it. It would only be potentially racy.
 	// See Issue 15908.
-	return slices.Contains(srv.TLSConfig.NextProtos, http2NextProtoTLS)
+	return slices.Contains(s.TLSConfig.NextProtos, http2NextProtoTLS)
 }
 
 // ErrServerClosed is returned by the [Server.Serve], [ServeTLS], [ListenAndServe],
@@ -3289,7 +3383,7 @@ var ErrServerClosed = errors.New("http: Server closed")
 
 // Serve accepts incoming connections on the Listener l, creating a
 // new service goroutine for each. The service goroutines read requests and
-// then call srv.Handler to reply to them.
+// then call s.Handler to reply to them.
 //
 // HTTP/2 support is only enabled if the Listener returns [*tls.Conn]
 // connections and they were configured with "h2" in the TLS
@@ -3297,27 +3391,27 @@ var ErrServerClosed = errors.New("http: Server closed")
 //
 // Serve always returns a non-nil error and closes l.
 // After [Server.Shutdown] or [Server.Close], the returned error is [ErrServerClosed].
-func (srv *Server) Serve(l net.Listener) error {
+func (s *Server) Serve(l net.Listener) error {
 	if fn := testHookServerServe; fn != nil {
-		fn(srv, l) // call hook with unwrapped listener
+		fn(s, l) // call hook with unwrapped listener
 	}
 
 	origListener := l
 	l = &onceCloseListener{Listener: l}
 	defer l.Close()
 
-	if err := srv.setupHTTP2_Serve(); err != nil {
+	if err := s.setupHTTP2_Serve(); err != nil {
 		return err
 	}
 
-	if !srv.trackListener(&l, true) {
+	if !s.trackListener(&l, true) {
 		return ErrServerClosed
 	}
-	defer srv.trackListener(&l, false)
+	defer s.trackListener(&l, false)
 
 	baseCtx := context.Background()
-	if srv.BaseContext != nil {
-		baseCtx = srv.BaseContext(origListener)
+	if s.BaseContext != nil {
+		baseCtx = s.BaseContext(origListener)
 		if baseCtx == nil {
 			panic("BaseContext returned a nil context")
 		}
@@ -3325,11 +3419,11 @@ func (srv *Server) Serve(l net.Listener) error {
 
 	var tempDelay time.Duration // how long to sleep on accept failure
 
-	ctx := context.WithValue(baseCtx, ServerContextKey, srv)
+	ctx := context.WithValue(baseCtx, ServerContextKey, s)
 	for {
 		rw, err := l.Accept()
 		if err != nil {
-			if srv.shuttingDown() {
+			if s.shuttingDown() {
 				return ErrServerClosed
 			}
 			if ne, ok := err.(net.Error); ok && ne.Temporary() {
@@ -3341,21 +3435,21 @@ func (srv *Server) Serve(l net.Listener) error {
 				if max := 1 * time.Second; tempDelay > max {
 					tempDelay = max
 				}
-				srv.logf("http: Accept error: %v; retrying in %v", err, tempDelay)
+				s.logf("http: Accept error: %v; retrying in %v", err, tempDelay)
 				time.Sleep(tempDelay)
 				continue
 			}
 			return err
 		}
 		connCtx := ctx
-		if cc := srv.ConnContext; cc != nil {
+		if cc := s.ConnContext; cc != nil {
 			connCtx = cc(connCtx, rw)
 			if connCtx == nil {
 				panic("ConnContext returned nil")
 			}
 		}
 		tempDelay = 0
-		c := srv.newConn(rw)
+		c := s.newConn(rw)
 		c.setState(c.rwc, StateNew, runHooks) // before Serve can return
 		go c.serve(connCtx)
 	}
@@ -3363,7 +3457,7 @@ func (srv *Server) Serve(l net.Listener) error {
 
 // ServeTLS accepts incoming connections on the Listener l, creating a
 // new service goroutine for each. The service goroutines perform TLS
-// setup and then read requests, calling srv.Handler to reply to them.
+// setup and then read requests, calling s.Handler to reply to them.
 //
 // Files containing a certificate and matching private key for the
 // server must be provided if neither the [Server]'s
@@ -3375,17 +3469,15 @@ func (srv *Server) Serve(l net.Listener) error {
 //
 // ServeTLS always returns a non-nil error. After [Server.Shutdown] or [Server.Close], the
 // returned error is [ErrServerClosed].
-func (srv *Server) ServeTLS(l net.Listener, certFile, keyFile string) error {
-	// Setup HTTP/2 before srv.Serve, to initialize srv.TLSConfig
+func (s *Server) ServeTLS(l net.Listener, certFile, keyFile string) error {
+	// Setup HTTP/2 before s.Serve, to initialize s.TLSConfig
 	// before we clone it and create the TLS Listener.
-	if err := srv.setupHTTP2_ServeTLS(); err != nil {
+	if err := s.setupHTTP2_ServeTLS(); err != nil {
 		return err
 	}
 
-	config := cloneTLSConfig(srv.TLSConfig)
-	if !slices.Contains(config.NextProtos, "http/1.1") {
-		config.NextProtos = append(config.NextProtos, "http/1.1")
-	}
+	config := cloneTLSConfig(s.TLSConfig)
+	config.NextProtos = adjustNextProtos(config.NextProtos, s.protocols())
 
 	configHasCert := len(config.Certificates) > 0 || config.GetCertificate != nil || config.GetConfigForClient != nil
 	if !configHasCert || certFile != "" || keyFile != "" {
@@ -3398,7 +3490,60 @@ func (srv *Server) ServeTLS(l net.Listener, certFile, keyFile string) error {
 	}
 
 	tlsListener := tls.NewListener(l, config)
-	return srv.Serve(tlsListener)
+	return s.Serve(tlsListener)
+}
+
+func (s *Server) protocols() Protocols {
+	if s.Protocols != nil {
+		return *s.Protocols // user-configured set
+	}
+
+	// The historic way of disabling HTTP/2 is to set TLSNextProto to
+	// a non-nil map with no "h2" entry.
+	_, hasH2 := s.TLSNextProto["h2"]
+	http2Disabled := s.TLSNextProto != nil && !hasH2
+
+	// If GODEBUG=http2server=0, then HTTP/2 is disabled unless
+	// the user has manually added an "h2" entry to TLSNextProto
+	// (probably by using x/net/http2 directly).
+	if http2server.Value() == "0" && !hasH2 {
+		http2Disabled = true
+	}
+
+	var p Protocols
+	p.SetHTTP1(true) // default always includes HTTP/1
+	if !http2Disabled {
+		p.SetHTTP2(true)
+	}
+	return p
+}
+
+// adjustNextProtos adds or removes "http/1.1" and "h2" entries from
+// a tls.Config.NextProtos list, according to the set of protocols in protos.
+func adjustNextProtos(nextProtos []string, protos Protocols) []string {
+	var have Protocols
+	nextProtos = slices.DeleteFunc(nextProtos, func(s string) bool {
+		switch s {
+		case "http/1.1":
+			if !protos.HTTP1() {
+				return true
+			}
+			have.SetHTTP1(true)
+		case "h2":
+			if !protos.HTTP2() {
+				return true
+			}
+			have.SetHTTP2(true)
+		}
+		return false
+	})
+	if protos.HTTP2() && !have.HTTP2() {
+		nextProtos = append(nextProtos, "h2")
+	}
+	if protos.HTTP1() && !have.HTTP1() {
+		nextProtos = append(nextProtos, "http/1.1")
+	}
+	return nextProtos
 }
 
 // trackListener adds or removes a net.Listener to the set of tracked
@@ -3469,15 +3614,15 @@ func (s *Server) shuttingDown() bool {
 // By default, keep-alives are always enabled. Only very
 // resource-constrained environments or servers in the process of
 // shutting down should disable them.
-func (srv *Server) SetKeepAlivesEnabled(v bool) {
+func (s *Server) SetKeepAlivesEnabled(v bool) {
 	if v {
-		srv.disableKeepAlives.Store(false)
+		s.disableKeepAlives.Store(false)
 		return
 	}
-	srv.disableKeepAlives.Store(true)
+	s.disableKeepAlives.Store(true)
 
 	// Close idle HTTP/1 conns:
-	srv.closeIdleConns()
+	s.closeIdleConns()
 
 	// TODO: Issue 26303: close HTTP/2 conns as soon as they become idle.
 }
@@ -3524,7 +3669,7 @@ func ListenAndServeTLS(addr, certFile, keyFile string, handler Handler) error {
 	return server.ListenAndServeTLS(certFile, keyFile)
 }
 
-// ListenAndServeTLS listens on the TCP network address srv.Addr and
+// ListenAndServeTLS listens on the TCP network address s.Addr and
 // then calls [ServeTLS] to handle requests on incoming TLS connections.
 // Accepted connections are configured to enable TCP keep-alives.
 //
@@ -3535,15 +3680,15 @@ func ListenAndServeTLS(addr, certFile, keyFile string, handler Handler) error {
 // concatenation of the server's certificate, any intermediates, and
 // the CA's certificate.
 //
-// If srv.Addr is blank, ":https" is used.
+// If s.Addr is blank, ":https" is used.
 //
 // ListenAndServeTLS always returns a non-nil error. After [Server.Shutdown] or
 // [Server.Close], the returned error is [ErrServerClosed].
-func (srv *Server) ListenAndServeTLS(certFile, keyFile string) error {
-	if srv.shuttingDown() {
+func (s *Server) ListenAndServeTLS(certFile, keyFile string) error {
+	if s.shuttingDown() {
 		return ErrServerClosed
 	}
-	addr := srv.Addr
+	addr := s.Addr
 	if addr == "" {
 		addr = ":https"
 	}
@@ -3555,55 +3700,61 @@ func (srv *Server) ListenAndServeTLS(certFile, keyFile string) error {
 
 	defer ln.Close()
 
-	return srv.ServeTLS(ln, certFile, keyFile)
+	return s.ServeTLS(ln, certFile, keyFile)
 }
 
 // setupHTTP2_ServeTLS conditionally configures HTTP/2 on
-// srv and reports whether there was an error setting it up. If it is
+// s and reports whether there was an error setting it up. If it is
 // not configured for policy reasons, nil is returned.
-func (srv *Server) setupHTTP2_ServeTLS() error {
-	srv.nextProtoOnce.Do(srv.onceSetNextProtoDefaults)
-	return srv.nextProtoErr
+func (s *Server) setupHTTP2_ServeTLS() error {
+	s.nextProtoOnce.Do(s.onceSetNextProtoDefaults)
+	return s.nextProtoErr
 }
 
 // setupHTTP2_Serve is called from (*Server).Serve and conditionally
-// configures HTTP/2 on srv using a more conservative policy than
+// configures HTTP/2 on s using a more conservative policy than
 // setupHTTP2_ServeTLS because Serve is called after tls.Listen,
 // and may be called concurrently. See shouldConfigureHTTP2ForServe.
 //
 // The tests named TestTransportAutomaticHTTP2* and
 // TestConcurrentServerServe in server_test.go demonstrate some
 // of the supported use cases and motivations.
-func (srv *Server) setupHTTP2_Serve() error {
-	srv.nextProtoOnce.Do(srv.onceSetNextProtoDefaults_Serve)
-	return srv.nextProtoErr
+func (s *Server) setupHTTP2_Serve() error {
+	s.nextProtoOnce.Do(s.onceSetNextProtoDefaults_Serve)
+	return s.nextProtoErr
 }
 
-func (srv *Server) onceSetNextProtoDefaults_Serve() {
-	if srv.shouldConfigureHTTP2ForServe() {
-		srv.onceSetNextProtoDefaults()
+func (s *Server) onceSetNextProtoDefaults_Serve() {
+	if s.shouldConfigureHTTP2ForServe() {
+		s.onceSetNextProtoDefaults()
 	}
 }
 
 var http2server = godebug.New("http2server")
 
 // onceSetNextProtoDefaults configures HTTP/2, if the user hasn't
-// configured otherwise. (by setting srv.TLSNextProto non-nil)
-// It must only be called via srv.nextProtoOnce (use srv.setupHTTP2_*).
-func (srv *Server) onceSetNextProtoDefaults() {
+// configured otherwise. (by setting s.TLSNextProto non-nil)
+// It must only be called via s.nextProtoOnce (use s.setupHTTP2_*).
+func (s *Server) onceSetNextProtoDefaults() {
 	if omitBundledHTTP2 {
 		return
 	}
+	p := s.protocols()
+	if !p.HTTP2() && !p.UnencryptedHTTP2() {
+		return
+	}
 	if http2server.Value() == "0" {
 		http2server.IncNonDefault()
 		return
 	}
-	// Enable HTTP/2 by default if the user hasn't otherwise
-	// configured their TLSNextProto map.
-	if srv.TLSNextProto == nil {
-		conf := &http2Server{}
-		srv.nextProtoErr = http2ConfigureServer(srv, conf)
+	if _, ok := s.TLSNextProto["h2"]; ok {
+		// TLSNextProto already contains an HTTP/2 implementation.
+		// The user probably called golang.org/x/net/http2.ConfigureServer
+		// to add it.
+		return
 	}
+	conf := &http2Server{}
+	s.nextProtoErr = http2ConfigureServer(s, conf)
 }
 
 // TimeoutHandler returns a [Handler] that runs h with the given time limit.
@@ -3677,9 +3828,7 @@ func (h *timeoutHandler) ServeHTTP(w ResponseWriter, r *Request) {
 		tw.mu.Lock()
 		defer tw.mu.Unlock()
 		dst := w.Header()
-		for k, vv := range tw.h {
-			dst[k] = vv
-		}
+		maps.Copy(dst, tw.h)
 		if !tw.wroteHeader {
 			tw.code = StatusOK
 		}
diff --git a/src/net/http/sniff_test.go b/src/net/http/sniff_test.go
index d6ef4090..68c8a6af 100644
--- a/src/net/http/sniff_test.go
+++ b/src/net/http/sniff_test.go
@@ -10,7 +10,7 @@ import (
 	"io"
 	"log"
 	. "net/http"
-	"reflect"
+	"slices"
 	"strconv"
 	"strings"
 	"testing"
@@ -144,7 +144,7 @@ func testServerIssue5953(t *testing.T, mode testMode) {
 
 	got := resp.Header["Content-Type"]
 	want := []string{""}
-	if !reflect.DeepEqual(got, want) {
+	if !slices.Equal(got, want) {
 		t.Errorf("Content-Type = %q; want %q", got, want)
 	}
 	resp.Body.Close()
diff --git a/src/net/http/transfer.go b/src/net/http/transfer.go
index 5a3c6cef..67555128 100644
--- a/src/net/http/transfer.go
+++ b/src/net/http/transfer.go
@@ -11,6 +11,7 @@ import (
 	"fmt"
 	"internal/godebug"
 	"io"
+	"maps"
 	"net/http/httptrace"
 	"net/http/internal"
 	"net/http/internal/ascii"
@@ -350,7 +351,7 @@ func (t *transferWriter) writeBody(w io.Writer) (err error) {
 	// nopCloser or readTrackingBody. This is to ensure that we can take advantage of
 	// OS-level optimizations in the event that the body is an
 	// *os.File.
-	if t.Body != nil {
+	if !t.ResponseToHEAD && t.Body != nil {
 		var body = t.unwrapBody()
 		if chunked(t.TransferEncoding) {
 			if bw, ok := w.(*bufio.Writer); ok && !t.IsResponse {
@@ -392,7 +393,7 @@ func (t *transferWriter) writeBody(w io.Writer) (err error) {
 			t.ContentLength, ncopy)
 	}
 
-	if chunked(t.TransferEncoding) {
+	if !t.ResponseToHEAD && chunked(t.TransferEncoding) {
 		// Write Trailer header
 		if t.Trailer != nil {
 			if err := t.Trailer.Write(w); err != nil {
@@ -954,9 +955,7 @@ func mergeSetHeader(dst *Header, src Header) {
 		*dst = src
 		return
 	}
-	for k, vv := range src {
-		(*dst)[k] = vv
-	}
+	maps.Copy(*dst, src)
 }
 
 // unreadDataSizeLocked returns the number of bytes of unread input.
diff --git a/src/net/http/transport.go b/src/net/http/transport.go
index da9163a2..41e67418 100644
--- a/src/net/http/transport.go
+++ b/src/net/http/transport.go
@@ -20,6 +20,7 @@ import (
 	"internal/godebug"
 	"io"
 	"log"
+	"maps"
 	"net"
 	"net/http/httptrace"
 	"net/http/internal/ascii"
@@ -75,8 +76,7 @@ const DefaultMaxIdleConnsPerHost = 2
 // Transport uses HTTP/1.1 for HTTP URLs and either HTTP/1.1 or HTTP/2
 // for HTTPS URLs, depending on whether the server supports HTTP/2,
 // and how the Transport is configured. The [DefaultTransport] supports HTTP/2.
-// To explicitly enable HTTP/2 on a transport, use golang.org/x/net/http2
-// and call ConfigureTransport. See the package docs for more about HTTP/2.
+// To explicitly enable HTTP/2 on a transport, set [Transport.Protocols].
 //
 // Responses with status codes in the 1xx range are either handled
 // automatically (100 expect-continue) or ignored. The one
@@ -293,6 +293,22 @@ type Transport struct {
 	// To use a custom dialer or TLS config and still attempt HTTP/2
 	// upgrades, set this to true.
 	ForceAttemptHTTP2 bool
+
+	// HTTP2 configures HTTP/2 connections.
+	//
+	// This field does not yet have any effect.
+	// See https://go.dev/issue/67813.
+	HTTP2 *HTTP2Config
+
+	// Protocols is the set of protocols supported by the transport.
+	//
+	// If Protocols includes UnencryptedHTTP2 and does not include HTTP1,
+	// the transport will use unencrypted HTTP/2 for requests for http:// URLs.
+	//
+	// If Protocols is nil, the default is usually HTTP/1 only.
+	// If ForceAttemptHTTP2 is true, or if TLSNextProto contains an "h2" entry,
+	// the default is HTTP/1 and HTTP/2.
+	Protocols *Protocols
 }
 
 func (t *Transport) writeBufferSize() int {
@@ -338,10 +354,18 @@ func (t *Transport) Clone() *Transport {
 	if t.TLSClientConfig != nil {
 		t2.TLSClientConfig = t.TLSClientConfig.Clone()
 	}
+	if t.HTTP2 != nil {
+		t2.HTTP2 = &HTTP2Config{}
+		*t2.HTTP2 = *t.HTTP2
+	}
+	if t.Protocols != nil {
+		t2.Protocols = &Protocols{}
+		*t2.Protocols = *t.Protocols
+	}
 	if !t.tlsNextProtoWasNil {
-		npm := map[string]func(authority string, c *tls.Conn) RoundTripper{}
-		for k, v := range t.TLSNextProto {
-			npm[k] = v
+		npm := maps.Clone(t.TLSNextProto)
+		if npm == nil {
+			npm = make(map[string]func(authority string, c *tls.Conn) RoundTripper)
 		}
 		t2.TLSNextProto = npm
 	}
@@ -388,18 +412,12 @@ func (t *Transport) onceSetNextProtoDefaults() {
 		}
 	}
 
-	if t.TLSNextProto != nil {
-		// This is the documented way to disable http2 on a
-		// Transport.
+	if _, ok := t.TLSNextProto["h2"]; ok {
+		// There's an existing HTTP/2 implementation installed.
 		return
 	}
-	if !t.ForceAttemptHTTP2 && (t.TLSClientConfig != nil || t.Dial != nil || t.DialContext != nil || t.hasCustomTLSDialer()) {
-		// Be conservative and don't automatically enable
-		// http2 if they've specified a custom TLS config or
-		// custom dialers. Let them opt-in themselves via
-		// http2.ConfigureTransport so we don't surprise them
-		// by modifying their tls.Config. Issue 14275.
-		// However, if ForceAttemptHTTP2 is true, it overrides the above checks.
+	protocols := t.protocols()
+	if !protocols.HTTP2() && !protocols.UnencryptedHTTP2() {
 		return
 	}
 	if omitBundledHTTP2 {
@@ -426,6 +444,40 @@ func (t *Transport) onceSetNextProtoDefaults() {
 			t2.MaxHeaderListSize = uint32(limit1)
 		}
 	}
+
+	// Server.ServeTLS clones the tls.Config before modifying it.
+	// Transport doesn't. We may want to make the two consistent some day.
+	//
+	// http2configureTransport will have already set NextProtos, but adjust it again
+	// here to remove HTTP/1.1 if the user has disabled it.
+	t.TLSClientConfig.NextProtos = adjustNextProtos(t.TLSClientConfig.NextProtos, protocols)
+}
+
+func (t *Transport) protocols() Protocols {
+	if t.Protocols != nil {
+		return *t.Protocols // user-configured set
+	}
+	var p Protocols
+	p.SetHTTP1(true) // default always includes HTTP/1
+	switch {
+	case t.TLSNextProto != nil:
+		// Setting TLSNextProto to an empty map is a documented way
+		// to disable HTTP/2 on a Transport.
+		if t.TLSNextProto["h2"] != nil {
+			p.SetHTTP2(true)
+		}
+	case !t.ForceAttemptHTTP2 && (t.TLSClientConfig != nil || t.Dial != nil || t.DialContext != nil || t.hasCustomTLSDialer()):
+		// Be conservative and don't automatically enable
+		// http2 if they've specified a custom TLS config or
+		// custom dialers. Let them opt-in themselves via
+		// Transport.Protocols.SetHTTP2(true) so we don't surprise them
+		// by modifying their tls.Config. Issue 14275.
+		// However, if ForceAttemptHTTP2 is true, it overrides the above checks.
+	case http2client.Value() == "0":
+	default:
+		p.SetHTTP2(true)
+	}
+	return p
 }
 
 // ProxyFromEnvironment returns the URL of the proxy to use for a
@@ -820,9 +872,9 @@ func (t *Transport) RegisterProtocol(scheme string, rt RoundTripper) {
 	if _, exists := oldMap[scheme]; exists {
 		panic("protocol " + scheme + " already registered")
 	}
-	newMap := make(map[string]RoundTripper)
-	for k, v := range oldMap {
-		newMap[k] = v
+	newMap := maps.Clone(oldMap)
+	if newMap == nil {
+		newMap = make(map[string]RoundTripper)
 	}
 	newMap[scheme] = rt
 	t.altProto.Store(newMap)
@@ -1857,6 +1909,24 @@ func (t *Transport) dialConn(ctx context.Context, cm connectMethod) (pconn *pers
 		}
 	}
 
+	// Possible unencrypted HTTP/2 with prior knowledge.
+	unencryptedHTTP2 := pconn.tlsState == nil &&
+		t.Protocols != nil &&
+		t.Protocols.UnencryptedHTTP2() &&
+		!t.Protocols.HTTP1()
+	if unencryptedHTTP2 {
+		next, ok := t.TLSNextProto[nextProtoUnencryptedHTTP2]
+		if !ok {
+			return nil, errors.New("http: Transport does not support unencrypted HTTP/2")
+		}
+		alt := next(cm.targetAddr, unencryptedTLSConn(pconn.conn))
+		if e, ok := alt.(erringRoundTripper); ok {
+			// pconn.conn was closed by next (http2configureTransports.upgradeFn).
+			return nil, e.RoundTripErr()
+		}
+		return &persistConn{t: t, cacheKey: pconn.cacheKey, alt: alt}, nil
+	}
+
 	if s := pconn.tlsState; s != nil && s.NegotiatedProtocolIsMutual && s.NegotiatedProtocol != "" {
 		if next, ok := t.TLSNextProto[s.NegotiatedProtocol]; ok {
 			alt := next(cm.targetAddr, pconn.conn.(*tls.Conn))
@@ -2387,8 +2457,6 @@ func (pc *persistConn) readResponse(rc requestAndChan, trace *httptrace.ClientTr
 			trace.GotFirstResponseByte()
 		}
 	}
-	num1xx := 0               // number of informational 1xx headers received
-	const max1xxResponses = 5 // arbitrary bound on number of informational responses
 
 	continueCh := rc.continueCh
 	for {
@@ -2408,15 +2476,18 @@ func (pc *persistConn) readResponse(rc requestAndChan, trace *httptrace.ClientTr
 		// treat 101 as a terminal status, see issue 26161
 		is1xxNonTerminal := is1xx && resCode != StatusSwitchingProtocols
 		if is1xxNonTerminal {
-			num1xx++
-			if num1xx > max1xxResponses {
-				return nil, errors.New("net/http: too many 1xx informational responses")
-			}
-			pc.readLimit = pc.maxHeaderResponseSize() // reset the limit
 			if trace != nil && trace.Got1xxResponse != nil {
 				if err := trace.Got1xxResponse(resCode, textproto.MIMEHeader(resp.Header)); err != nil {
 					return nil, err
 				}
+				// If the 1xx response was delivered to the user,
+				// then they're responsible for limiting the number of
+				// responses. Reset the header limit.
+				//
+				// If the user didn't examine the 1xx response, then we
+				// limit the size of all headers (including both 1xx
+				// and the final response) to maxHeaderResponseSize.
+				pc.readLimit = pc.maxHeaderResponseSize() // reset the limit
 			}
 			continue
 		}
diff --git a/src/net/http/transport_test.go b/src/net/http/transport_test.go
index ae7159da..a454db5e 100644
--- a/src/net/http/transport_test.go
+++ b/src/net/http/transport_test.go
@@ -22,6 +22,7 @@ import (
 	"fmt"
 	"go/token"
 	"internal/nettrace"
+	"internal/synctest"
 	"io"
 	"log"
 	mrand "math/rand"
@@ -36,6 +37,7 @@ import (
 	"os"
 	"reflect"
 	"runtime"
+	"slices"
 	"strconv"
 	"strings"
 	"sync"
@@ -2585,8 +2587,8 @@ func runCancelTestTransport(t *testing.T, mode testMode, f func(t *testing.T, te
 
 // runCancelTestChannel uses Request.Cancel.
 func runCancelTestChannel(t *testing.T, mode testMode, f func(t *testing.T, test cancelTest)) {
-	var cancelOnce sync.Once
 	cancelc := make(chan struct{})
+	cancelOnce := sync.OnceFunc(func() { close(cancelc) })
 	f(t, cancelTest{
 		mode: mode,
 		newReq: func(req *Request) *Request {
@@ -2594,9 +2596,7 @@ func runCancelTestChannel(t *testing.T, mode testMode, f func(t *testing.T, test
 			return req
 		},
 		cancel: func(tr *Transport, req *Request) {
-			cancelOnce.Do(func() {
-				close(cancelc)
-			})
+			cancelOnce()
 		},
 		checkErr: func(when string, err error) {
 			if !errors.Is(err, ExportErrRequestCanceled) && !errors.Is(err, ExportErrRequestCanceledConn) {
@@ -3259,29 +3259,68 @@ func testTransportIgnore1xxResponses(t *testing.T, mode testMode) {
 	}
 }
 
-func TestTransportLimits1xxResponses(t *testing.T) {
-	run(t, testTransportLimits1xxResponses, []testMode{http1Mode})
-}
+func TestTransportLimits1xxResponses(t *testing.T) { run(t, testTransportLimits1xxResponses) }
 func testTransportLimits1xxResponses(t *testing.T, mode testMode) {
 	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
-		conn, buf, _ := w.(Hijacker).Hijack()
+		w.Header().Add("X-Header", strings.Repeat("a", 100))
 		for i := 0; i < 10; i++ {
-			buf.Write([]byte("HTTP/1.1 123 OneTwoThree\r\n\r\n"))
+			w.WriteHeader(123)
 		}
-		buf.Write([]byte("HTTP/1.1 204 No Content\r\n\r\n"))
-		buf.Flush()
-		conn.Close()
+		w.WriteHeader(204)
 	}))
 	cst.tr.DisableKeepAlives = true // prevent log spam; our test server is hanging up anyway
+	cst.tr.MaxResponseHeaderBytes = 1000
 
 	res, err := cst.c.Get(cst.ts.URL)
-	if res != nil {
-		defer res.Body.Close()
+	if err == nil {
+		res.Body.Close()
+		t.Fatalf("RoundTrip succeeded; want error")
 	}
-	got := fmt.Sprint(err)
-	wantSub := "too many 1xx informational responses"
-	if !strings.Contains(got, wantSub) {
-		t.Errorf("Get error = %v; want substring %q", err, wantSub)
+	for _, want := range []string{
+		"response headers exceeded",
+		"too many 1xx",
+		"header list too large",
+	} {
+		if strings.Contains(err.Error(), want) {
+			return
+		}
+	}
+	t.Errorf(`got error %q; want "response headers exceeded" or "too many 1xx"`, err)
+}
+
+func TestTransportDoesNotLimitDelivered1xxResponses(t *testing.T) {
+	run(t, testTransportDoesNotLimitDelivered1xxResponses)
+}
+func testTransportDoesNotLimitDelivered1xxResponses(t *testing.T, mode testMode) {
+	if mode == http2Mode {
+		t.Skip("skip until x/net/http2 updated")
+	}
+	const num1xx = 10
+	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
+		w.Header().Add("X-Header", strings.Repeat("a", 100))
+		for i := 0; i < 10; i++ {
+			w.WriteHeader(123)
+		}
+		w.WriteHeader(204)
+	}))
+	cst.tr.DisableKeepAlives = true // prevent log spam; our test server is hanging up anyway
+	cst.tr.MaxResponseHeaderBytes = 1000
+
+	got1xx := 0
+	ctx := httptrace.WithClientTrace(context.Background(), &httptrace.ClientTrace{
+		Got1xxResponse: func(code int, header textproto.MIMEHeader) error {
+			got1xx++
+			return nil
+		},
+	})
+	req, _ := NewRequestWithContext(ctx, "GET", cst.ts.URL, nil)
+	res, err := cst.c.Do(req)
+	if err != nil {
+		t.Fatal(err)
+	}
+	res.Body.Close()
+	if got1xx != num1xx {
+		t.Errorf("Got %v 1xx responses, want %x", got1xx, num1xx)
 	}
 }
 
@@ -4181,53 +4220,175 @@ func TestTransportTraceGotConnH2IdleConns(t *testing.T) {
 	wantIdle("after round trip", 1)
 }
 
-func TestTransportRemovesH2ConnsAfterIdle(t *testing.T) {
-	run(t, testTransportRemovesH2ConnsAfterIdle, []testMode{http2Mode})
+// https://go.dev/issue/70515
+//
+// When the first request on a new connection fails, we do not retry the request.
+// If the first request on a connection races with IdleConnTimeout,
+// we should not fail the request.
+func TestTransportIdleConnRacesRequest(t *testing.T) {
+	// Use unencrypted HTTP/2, since the *tls.Conn interfers with our ability to
+	// block the connection closing.
+	runSynctest(t, testTransportIdleConnRacesRequest, []testMode{http1Mode, http2UnencryptedMode})
 }
-func testTransportRemovesH2ConnsAfterIdle(t *testing.T, mode testMode) {
+func testTransportIdleConnRacesRequest(t testing.TB, mode testMode) {
+	if mode == http2UnencryptedMode {
+		t.Skip("remove skip when #70515 is fixed")
+	}
+	timeout := 1 * time.Millisecond
+	trFunc := func(tr *Transport) {
+		tr.IdleConnTimeout = timeout
+	}
+	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
+	}), trFunc, optFakeNet)
+	cst.li.trackConns = true
+
+	// We want to put a connection into the pool which has never had a request made on it.
+	//
+	// Make a request and cancel it before the dial completes.
+	// Then complete the dial.
+	dialc := make(chan struct{})
+	cst.li.onDial = func() {
+		<-dialc
+	}
+	ctx, cancel := context.WithCancel(context.Background())
+	req1c := make(chan error)
+	go func() {
+		req, _ := NewRequestWithContext(ctx, "GET", cst.ts.URL, nil)
+		resp, err := cst.c.Do(req)
+		if err == nil {
+			resp.Body.Close()
+		}
+		req1c <- err
+	}()
+	// Wait for the connection attempt to start.
+	synctest.Wait()
+	// Cancel the request.
+	cancel()
+	synctest.Wait()
+	if err := <-req1c; err == nil {
+		t.Fatal("expected request to fail, but it succeeded")
+	}
+	// Unblock the dial, placing a new, unused connection into the Transport's pool.
+	close(dialc)
+
+	// We want IdleConnTimeout to race with a new request.
+	//
+	// There's no perfect way to do this, but the following exercises the bug in #70515:
+	// Block net.Conn.Close, wait until IdleConnTimeout occurs, and make a request while
+	// the connection close is still blocked.
+	//
+	// First: Wait for IdleConnTimeout. The net.Conn.Close blocks.
+	synctest.Wait()
+	closec := make(chan struct{})
+	cst.li.conns[0].peer.onClose = func() {
+		<-closec
+	}
+	time.Sleep(timeout)
+	synctest.Wait()
+	// Make a request, which will use a new connection (since the existing one is closing).
+	req2c := make(chan error)
+	go func() {
+		resp, err := cst.c.Get(cst.ts.URL)
+		if err == nil {
+			resp.Body.Close()
+		}
+		req2c <- err
+	}()
+	// Don't synctest.Wait here: The HTTP/1 transport closes the idle conn
+	// with a mutex held, and we'll end up in a deadlock.
+	close(closec)
+	if err := <-req2c; err != nil {
+		t.Fatalf("Get: %v", err)
+	}
+}
+
+func TestTransportRemovesConnsAfterIdle(t *testing.T) {
+	runSynctest(t, testTransportRemovesConnsAfterIdle)
+}
+func testTransportRemovesConnsAfterIdle(t testing.TB, mode testMode) {
 	if testing.Short() {
 		t.Skip("skipping in short mode")
 	}
 
-	timeout := 1 * time.Millisecond
-	retry := true
-	for retry {
-		trFunc := func(tr *Transport) {
-			tr.MaxConnsPerHost = 1
-			tr.MaxIdleConnsPerHost = 1
-			tr.IdleConnTimeout = timeout
-		}
-		cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {}), trFunc)
+	timeout := 1 * time.Second
+	trFunc := func(tr *Transport) {
+		tr.MaxConnsPerHost = 1
+		tr.MaxIdleConnsPerHost = 1
+		tr.IdleConnTimeout = timeout
+	}
+	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
+		w.Header().Set("X-Addr", r.RemoteAddr)
+	}), trFunc, optFakeNet)
 
-		retry = false
-		tooShort := func(err error) bool {
-			if err == nil || !strings.Contains(err.Error(), "use of closed network connection") {
-				return false
-			}
-			if !retry {
-				t.Helper()
-				t.Logf("idle conn timeout %v may be too short; retrying with longer", timeout)
-				timeout *= 2
-				retry = true
-				cst.close()
-			}
-			return true
-		}
-
-		if _, err := cst.c.Get(cst.ts.URL); err != nil {
-			if tooShort(err) {
-				continue
-			}
+	// makeRequest returns the local address a request was made from
+	// (unique for each connection).
+	makeRequest := func() string {
+		resp, err := cst.c.Get(cst.ts.URL)
+		if err != nil {
 			t.Fatalf("got error: %s", err)
 		}
+		resp.Body.Close()
+		return resp.Header.Get("X-Addr")
+	}
 
-		time.Sleep(10 * timeout)
-		if _, err := cst.c.Get(cst.ts.URL); err != nil {
-			if tooShort(err) {
-				continue
-			}
+	addr1 := makeRequest()
+
+	time.Sleep(timeout / 2)
+	synctest.Wait()
+	addr2 := makeRequest()
+	if addr1 != addr2 {
+		t.Fatalf("two requests made within IdleConnTimeout should have used the same conn, but used %v, %v", addr1, addr2)
+	}
+
+	time.Sleep(timeout)
+	synctest.Wait()
+	addr3 := makeRequest()
+	if addr1 == addr3 {
+		t.Fatalf("two requests made more than IdleConnTimeout apart should have used different conns, but used %v, %v", addr1, addr3)
+	}
+}
+
+func TestTransportRemovesConnsAfterBroken(t *testing.T) {
+	runSynctest(t, testTransportRemovesConnsAfterBroken)
+}
+func testTransportRemovesConnsAfterBroken(t testing.TB, mode testMode) {
+	if testing.Short() {
+		t.Skip("skipping in short mode")
+	}
+
+	trFunc := func(tr *Transport) {
+		tr.MaxConnsPerHost = 1
+		tr.MaxIdleConnsPerHost = 1
+	}
+	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
+		w.Header().Set("X-Addr", r.RemoteAddr)
+	}), trFunc, optFakeNet)
+	cst.li.trackConns = true
+
+	// makeRequest returns the local address a request was made from
+	// (unique for each connection).
+	makeRequest := func() string {
+		resp, err := cst.c.Get(cst.ts.URL)
+		if err != nil {
 			t.Fatalf("got error: %s", err)
 		}
+		resp.Body.Close()
+		return resp.Header.Get("X-Addr")
+	}
+
+	addr1 := makeRequest()
+	addr2 := makeRequest()
+	if addr1 != addr2 {
+		t.Fatalf("successive requests should have used the same conn, but used %v, %v", addr1, addr2)
+	}
+
+	// The connection breaks.
+	synctest.Wait()
+	cst.li.conns[0].peer.Close()
+	synctest.Wait()
+	addr3 := makeRequest()
+	if addr1 == addr3 {
+		t.Fatalf("successive requests made with conn broken between should have used different conns, but used %v, %v", addr1, addr3)
 	}
 }
 
@@ -4453,7 +4614,7 @@ func TestTransportFlushesBodyChunks(t *testing.T) {
 		"5\r\nnum2\n\r\n",
 		"0\r\n\r\n",
 	}
-	if !reflect.DeepEqual(lw.writes, want) {
+	if !slices.Equal(lw.writes, want) {
 		t.Errorf("Writes differed.\n Got: %q\nWant: %q\n", lw.writes, want)
 	}
 }
@@ -5113,20 +5274,16 @@ func testTransportEventTraceTLSVerify(t *testing.T, mode testMode) {
 	}
 }
 
-var (
-	isDNSHijackedOnce sync.Once
-	isDNSHijacked     bool
-)
+var isDNSHijacked = sync.OnceValue(func() bool {
+	addrs, _ := net.LookupHost("dns-should-not-resolve.golang")
+	return len(addrs) != 0
+})
 
 func skipIfDNSHijacked(t *testing.T) {
 	// Skip this test if the user is using a shady/ISP
 	// DNS server hijacking queries.
 	// See issues 16732, 16716.
-	isDNSHijackedOnce.Do(func() {
-		addrs, _ := net.LookupHost("dns-should-not-resolve.golang")
-		isDNSHijacked = len(addrs) != 0
-	})
-	if isDNSHijacked {
+	if isDNSHijacked() {
 		t.Skip("skipping; test requires non-hijacking DNS server")
 	}
 }
@@ -5284,7 +5441,7 @@ func testTransportMaxIdleConns(t *testing.T, mode testMode) {
 		"|http|host-2.dns-is-faked.golang:" + port,
 		"|http|host-3.dns-is-faked.golang:" + port,
 	}
-	if got := tr.IdleConnKeysForTesting(); !reflect.DeepEqual(got, want) {
+	if got := tr.IdleConnKeysForTesting(); !slices.Equal(got, want) {
 		t.Fatalf("idle conn keys mismatch.\n got: %q\nwant: %q\n", got, want)
 	}
 
@@ -5296,7 +5453,7 @@ func testTransportMaxIdleConns(t *testing.T, mode testMode) {
 		"|http|host-3.dns-is-faked.golang:" + port,
 		"|http|host-4.dns-is-faked.golang:" + port,
 	}
-	if got := tr.IdleConnKeysForTesting(); !reflect.DeepEqual(got, want) {
+	if got := tr.IdleConnKeysForTesting(); !slices.Equal(got, want) {
 		t.Fatalf("idle conn keys mismatch after 5th host.\n got: %q\nwant: %q\n", got, want)
 	}
 }
@@ -5343,7 +5500,9 @@ timeoutLoop:
 					return false
 				}
 			}
-			res.Body.Close()
+			if err == nil {
+				res.Body.Close()
+			}
 			conns := idleConns()
 			if len(conns) != 1 {
 				if len(conns) == 0 {
@@ -5462,7 +5621,7 @@ func TestTransportReturnsPeekError(t *testing.T) {
 	errValue := errors.New("specific error value")
 
 	wrote := make(chan struct{})
-	var wroteOnce sync.Once
+	wroteOnce := sync.OnceFunc(func() { close(wrote) })
 
 	tr := &Transport{
 		Dial: func(network, addr string) (net.Conn, error) {
@@ -5472,7 +5631,7 @@ func TestTransportReturnsPeekError(t *testing.T) {
 					return 0, errValue
 				},
 				write: func(p []byte) (int, error) {
-					wroteOnce.Do(func() { close(wrote) })
+					wroteOnce()
 					return len(p), nil
 				},
 			}
@@ -6327,12 +6486,16 @@ func TestTransportClone(t *testing.T) {
 		GetProxyConnectHeader:  func(context.Context, *url.URL, string) (Header, error) { return nil, nil },
 		MaxResponseHeaderBytes: 1,
 		ForceAttemptHTTP2:      true,
+		HTTP2:                  &HTTP2Config{MaxConcurrentStreams: 1},
+		Protocols:              &Protocols{},
 		TLSNextProto: map[string]func(authority string, c *tls.Conn) RoundTripper{
 			"foo": func(authority string, c *tls.Conn) RoundTripper { panic("") },
 		},
 		ReadBufferSize:  1,
 		WriteBufferSize: 1,
 	}
+	tr.Protocols.SetHTTP1(true)
+	tr.Protocols.SetHTTP2(true)
 	tr2 := tr.Clone()
 	rv := reflect.ValueOf(tr2).Elem()
 	rt := rv.Type()
@@ -7133,3 +7296,266 @@ func testValidateClientRequestTrailers(t *testing.T, mode testMode) {
 		})
 	}
 }
+
+func TestTransportServerProtocols(t *testing.T) {
+	CondSkipHTTP2(t)
+	DefaultTransport.(*Transport).CloseIdleConnections()
+
+	cert, err := tls.X509KeyPair(testcert.LocalhostCert, testcert.LocalhostKey)
+	if err != nil {
+		t.Fatal(err)
+	}
+	leafCert, err := x509.ParseCertificate(cert.Certificate[0])
+	if err != nil {
+		t.Fatal(err)
+	}
+	certpool := x509.NewCertPool()
+	certpool.AddCert(leafCert)
+
+	for _, test := range []struct {
+		name      string
+		scheme    string
+		setup     func(t *testing.T)
+		transport func(*Transport)
+		server    func(*Server)
+		want      string
+	}{{
+		name:   "http default",
+		scheme: "http",
+		want:   "HTTP/1.1",
+	}, {
+		name:   "https default",
+		scheme: "https",
+		transport: func(tr *Transport) {
+			// Transport default is HTTP/1.
+		},
+		want: "HTTP/1.1",
+	}, {
+		name:   "https transport protocols include HTTP2",
+		scheme: "https",
+		transport: func(tr *Transport) {
+			// Server default is to support HTTP/2, so if the Transport enables
+			// HTTP/2 we get it.
+			tr.Protocols = &Protocols{}
+			tr.Protocols.SetHTTP1(true)
+			tr.Protocols.SetHTTP2(true)
+		},
+		want: "HTTP/2.0",
+	}, {
+		name:   "https transport protocols only include HTTP1",
+		scheme: "https",
+		transport: func(tr *Transport) {
+			// Explicitly enable only HTTP/1.
+			tr.Protocols = &Protocols{}
+			tr.Protocols.SetHTTP1(true)
+		},
+		want: "HTTP/1.1",
+	}, {
+		name:   "https transport ForceAttemptHTTP2",
+		scheme: "https",
+		transport: func(tr *Transport) {
+			// Pre-Protocols-field way of enabling HTTP/2.
+			tr.ForceAttemptHTTP2 = true
+		},
+		want: "HTTP/2.0",
+	}, {
+		name:   "https transport protocols override TLSNextProto",
+		scheme: "https",
+		transport: func(tr *Transport) {
+			// Setting TLSNextProto to an empty map is the historical way
+			// of disabling HTTP/2. Explicitly enabling HTTP2 in the Protocols
+			// field takes precedence.
+			tr.Protocols = &Protocols{}
+			tr.Protocols.SetHTTP1(true)
+			tr.Protocols.SetHTTP2(true)
+			tr.TLSNextProto = map[string]func(string, *tls.Conn) RoundTripper{}
+		},
+		want: "HTTP/2.0",
+	}, {
+		name:   "https server disables HTTP2 with TLSNextProto",
+		scheme: "https",
+		server: func(srv *Server) {
+			// Disable HTTP/2 on the server with TLSNextProto,
+			// use default Protocols value.
+			srv.TLSNextProto = map[string]func(*Server, *tls.Conn, Handler){}
+		},
+		want: "HTTP/1.1",
+	}, {
+		name:   "https server Protocols overrides empty TLSNextProto",
+		scheme: "https",
+		server: func(srv *Server) {
+			// Explicitly enabling HTTP2 in the Protocols field takes precedence
+			// over setting an empty TLSNextProto.
+			srv.Protocols = &Protocols{}
+			srv.Protocols.SetHTTP1(true)
+			srv.Protocols.SetHTTP2(true)
+			srv.TLSNextProto = map[string]func(*Server, *tls.Conn, Handler){}
+		},
+		want: "HTTP/2.0",
+	}, {
+		name:   "https server protocols only include HTTP1",
+		scheme: "https",
+		server: func(srv *Server) {
+			srv.Protocols = &Protocols{}
+			srv.Protocols.SetHTTP1(true)
+		},
+		want: "HTTP/1.1",
+	}, {
+		name:   "https server protocols include HTTP2",
+		scheme: "https",
+		server: func(srv *Server) {
+			srv.Protocols = &Protocols{}
+			srv.Protocols.SetHTTP1(true)
+			srv.Protocols.SetHTTP2(true)
+		},
+		want: "HTTP/2.0",
+	}, {
+		name:   "GODEBUG disables HTTP2 client",
+		scheme: "https",
+		setup: func(t *testing.T) {
+			t.Setenv("GODEBUG", "http2client=0")
+		},
+		transport: func(tr *Transport) {
+			// Server default is to support HTTP/2, so if the Transport enables
+			// HTTP/2 we get it.
+			tr.Protocols = &Protocols{}
+			tr.Protocols.SetHTTP1(true)
+			tr.Protocols.SetHTTP2(true)
+		},
+		want: "HTTP/1.1",
+	}, {
+		name:   "GODEBUG disables HTTP2 server",
+		scheme: "https",
+		setup: func(t *testing.T) {
+			t.Setenv("GODEBUG", "http2server=0")
+		},
+		transport: func(tr *Transport) {
+			// Server default is to support HTTP/2, so if the Transport enables
+			// HTTP/2 we get it.
+			tr.Protocols = &Protocols{}
+			tr.Protocols.SetHTTP1(true)
+			tr.Protocols.SetHTTP2(true)
+		},
+		want: "HTTP/1.1",
+	}, {
+		name:   "unencrypted HTTP2 with prior knowledge",
+		scheme: "http",
+		transport: func(tr *Transport) {
+			tr.Protocols = &Protocols{}
+			tr.Protocols.SetUnencryptedHTTP2(true)
+		},
+		server: func(srv *Server) {
+			srv.Protocols = &Protocols{}
+			srv.Protocols.SetHTTP1(true)
+			srv.Protocols.SetUnencryptedHTTP2(true)
+		},
+		want: "HTTP/2.0",
+	}, {
+		name:   "unencrypted HTTP2 only on server",
+		scheme: "http",
+		transport: func(tr *Transport) {
+			tr.Protocols = &Protocols{}
+			tr.Protocols.SetUnencryptedHTTP2(true)
+		},
+		server: func(srv *Server) {
+			srv.Protocols = &Protocols{}
+			srv.Protocols.SetUnencryptedHTTP2(true)
+		},
+		want: "HTTP/2.0",
+	}, {
+		name:   "unencrypted HTTP2 with no server support",
+		scheme: "http",
+		transport: func(tr *Transport) {
+			tr.Protocols = &Protocols{}
+			tr.Protocols.SetUnencryptedHTTP2(true)
+		},
+		server: func(srv *Server) {
+			srv.Protocols = &Protocols{}
+			srv.Protocols.SetHTTP1(true)
+		},
+		want: "error",
+	}, {
+		name:   "HTTP1 with no server support",
+		scheme: "http",
+		transport: func(tr *Transport) {
+			tr.Protocols = &Protocols{}
+			tr.Protocols.SetHTTP1(true)
+		},
+		server: func(srv *Server) {
+			srv.Protocols = &Protocols{}
+			srv.Protocols.SetUnencryptedHTTP2(true)
+		},
+		want: "error",
+	}, {
+		name:   "HTTPS1 with no server support",
+		scheme: "https",
+		transport: func(tr *Transport) {
+			tr.Protocols = &Protocols{}
+			tr.Protocols.SetHTTP1(true)
+		},
+		server: func(srv *Server) {
+			srv.Protocols = &Protocols{}
+			srv.Protocols.SetHTTP2(true)
+		},
+		want: "error",
+	}} {
+		t.Run(test.name, func(t *testing.T) {
+			// We don't use httptest here because it makes its own decisions
+			// about how to enable/disable HTTP/2.
+			srv := &Server{
+				TLSConfig: &tls.Config{
+					Certificates: []tls.Certificate{cert},
+				},
+				Handler: HandlerFunc(func(w ResponseWriter, req *Request) {
+					w.Header().Set("X-Proto", req.Proto)
+				}),
+			}
+			tr := &Transport{
+				TLSClientConfig: &tls.Config{
+					RootCAs: certpool,
+				},
+			}
+
+			if test.setup != nil {
+				test.setup(t)
+			}
+			if test.server != nil {
+				test.server(srv)
+			}
+			if test.transport != nil {
+				test.transport(tr)
+			} else {
+				tr.Protocols = &Protocols{}
+				tr.Protocols.SetHTTP1(true)
+				tr.Protocols.SetHTTP2(true)
+			}
+
+			listener := newLocalListener(t)
+			srvc := make(chan error, 1)
+			go func() {
+				switch test.scheme {
+				case "http":
+					srvc <- srv.Serve(listener)
+				case "https":
+					srvc <- srv.ServeTLS(listener, "", "")
+				}
+			}()
+			t.Cleanup(func() {
+				srv.Close()
+				<-srvc
+			})
+
+			client := &Client{Transport: tr}
+			resp, err := client.Get(test.scheme + "://" + listener.Addr().String())
+			if err != nil {
+				if test.want == "error" {
+					return
+				}
+				t.Fatal(err)
+			}
+			if got := resp.Header.Get("X-Proto"); got != test.want {
+				t.Fatalf("request proto %q, want %q", got, test.want)
+			}
+		})
+	}
+}
diff --git a/src/net/interface_linux.go b/src/net/interface_linux.go
index 9112ecc8..7856dae8 100644
--- a/src/net/interface_linux.go
+++ b/src/net/interface_linux.go
@@ -129,22 +129,14 @@ func interfaceAddrTable(ifi *Interface) ([]Addr, error) {
 	if err != nil {
 		return nil, os.NewSyscallError("parsenetlinkmessage", err)
 	}
-	var ift []Interface
-	if ifi == nil {
-		var err error
-		ift, err = interfaceTable(0)
-		if err != nil {
-			return nil, err
-		}
-	}
-	ifat, err := addrTable(ift, ifi, msgs)
+	ifat, err := addrTable(ifi, msgs)
 	if err != nil {
 		return nil, err
 	}
 	return ifat, nil
 }
 
-func addrTable(ift []Interface, ifi *Interface, msgs []syscall.NetlinkMessage) ([]Addr, error) {
+func addrTable(ifi *Interface, msgs []syscall.NetlinkMessage) ([]Addr, error) {
 	var ifat []Addr
 loop:
 	for _, m := range msgs {
@@ -153,14 +145,7 @@ loop:
 			break loop
 		case syscall.RTM_NEWADDR:
 			ifam := (*syscall.IfAddrmsg)(unsafe.Pointer(&m.Data[0]))
-			if len(ift) != 0 || ifi.Index == int(ifam.Index) {
-				if len(ift) != 0 {
-					var err error
-					ifi, err = interfaceByIndex(ift, int(ifam.Index))
-					if err != nil {
-						return nil, err
-					}
-				}
+			if ifi == nil || ifi.Index == int(ifam.Index) {
 				attrs, err := syscall.ParseNetlinkRouteAttr(&m)
 				if err != nil {
 					return nil, os.NewSyscallError("parsenetlinkrouteattr", err)
diff --git a/src/net/internal/cgotest/resstate.go b/src/net/internal/cgotest/resstate.go
index 1b487110..62cfa24e 100644
--- a/src/net/internal/cgotest/resstate.go
+++ b/src/net/internal/cgotest/resstate.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build cgo && darwin
+//go:build !netgo && cgo && darwin
 
 package cgotest
 
diff --git a/src/net/ip.go b/src/net/ip.go
index 3e0e85e1..e3ee6ca7 100644
--- a/src/net/ip.go
+++ b/src/net/ip.go
@@ -301,11 +301,18 @@ func (ip IP) String() string {
 	if len(ip) != IPv4len && len(ip) != IPv6len {
 		return "?" + hexString(ip)
 	}
-	// If IPv4, use dotted notation.
-	if p4 := ip.To4(); len(p4) == IPv4len {
-		return netip.AddrFrom4([4]byte(p4)).String()
+
+	var buf []byte
+	switch len(ip) {
+	case IPv4len:
+		const maxCap = len("255.255.255.255")
+		buf = make([]byte, 0, maxCap)
+	case IPv6len:
+		const maxCap = len("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff")
+		buf = make([]byte, 0, maxCap)
 	}
-	return netip.AddrFrom16([16]byte(ip)).String()
+	buf = ip.appendTo(buf)
+	return string(buf)
 }
 
 func hexString(b []byte) string {
@@ -325,17 +332,41 @@ func ipEmptyString(ip IP) string {
 	return ip.String()
 }
 
+// appendTo appends the string representation of ip to b and returns the expanded b
+// If len(ip) != IPv4len or IPv6len, it appends nothing.
+func (ip IP) appendTo(b []byte) []byte {
+	// If IPv4, use dotted notation.
+	if p4 := ip.To4(); len(p4) == IPv4len {
+		ip = p4
+	}
+	addr, _ := netip.AddrFromSlice(ip)
+	return addr.AppendTo(b)
+}
+
+// AppendText implements the [encoding.TextAppender] interface.
+// The encoding is the same as returned by [IP.String], with one exception:
+// When len(ip) is zero, it appends nothing.
+func (ip IP) AppendText(b []byte) ([]byte, error) {
+	if len(ip) == 0 {
+		return b, nil
+	}
+	if len(ip) != IPv4len && len(ip) != IPv6len {
+		return b, &AddrError{Err: "invalid IP address", Addr: hexString(ip)}
+	}
+
+	return ip.appendTo(b), nil
+}
+
 // MarshalText implements the [encoding.TextMarshaler] interface.
 // The encoding is the same as returned by [IP.String], with one exception:
 // When len(ip) is zero, it returns an empty slice.
 func (ip IP) MarshalText() ([]byte, error) {
-	if len(ip) == 0 {
-		return []byte(""), nil
+	// 24 is satisfied with all IPv4 addresses and short IPv6 addresses
+	b, err := ip.AppendText(make([]byte, 0, 24))
+	if err != nil {
+		return nil, err
 	}
-	if len(ip) != IPv4len && len(ip) != IPv6len {
-		return nil, &AddrError{Err: "invalid IP address", Addr: hexString(ip)}
-	}
-	return []byte(ip.String()), nil
+	return b, nil
 }
 
 // UnmarshalText implements the [encoding.TextUnmarshaler] interface.
diff --git a/src/net/ip_test.go b/src/net/ip_test.go
index 11c0b752..55c66fdf 100644
--- a/src/net/ip_test.go
+++ b/src/net/ip_test.go
@@ -149,6 +149,15 @@ func TestMarshalEmptyIP(t *testing.T) {
 	if !reflect.DeepEqual(got, []byte("")) {
 		t.Errorf(`got %#v, want []byte("")`, got)
 	}
+
+	buf := make([]byte, 4)
+	got, err = ip.AppendText(buf)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !reflect.DeepEqual(got, []byte("\x00\x00\x00\x00")) {
+		t.Errorf(`got %#v, want []byte("\x00\x00\x00\x00")`, got)
+	}
 }
 
 var ipStringTests = []*struct {
@@ -266,9 +275,54 @@ func TestIPString(t *testing.T) {
 		if out, err := tt.in.MarshalText(); !bytes.Equal(out, tt.byt) || !reflect.DeepEqual(err, tt.error) {
 			t.Errorf("IP.MarshalText(%v) = %v, %v, want %v, %v", tt.in, out, err, tt.byt, tt.error)
 		}
+		buf := make([]byte, 4, 32)
+		if out, err := tt.in.AppendText(buf); !bytes.Equal(out[4:], tt.byt) || !reflect.DeepEqual(err, tt.error) {
+			t.Errorf("IP.AppendText(%v) = %v, %v, want %v, %v", tt.in, out[4:], err, tt.byt, tt.error)
+		}
 	}
 }
 
+func TestIPAppendTextNoAllocs(t *testing.T) {
+	// except the invalid IP
+	for _, tt := range ipStringTests[:len(ipStringTests)-1] {
+		allocs := int(testing.AllocsPerRun(1000, func() {
+			buf := make([]byte, 0, 64)
+			_, _ = tt.in.AppendText(buf)
+		}))
+		if allocs != 0 {
+			t.Errorf("IP(%q) AppendText allocs: %d times, want 0", tt.in, allocs)
+		}
+	}
+}
+
+func BenchmarkIPMarshalText(b *testing.B) {
+	b.Run("IPv4", func(b *testing.B) {
+		b.ReportAllocs()
+		b.ResetTimer()
+		ip := IP{192, 0, 2, 1}
+		for range b.N {
+			_, _ = ip.MarshalText()
+		}
+	})
+	b.Run("IPv6", func(b *testing.B) {
+		b.ReportAllocs()
+		b.ResetTimer()
+		ip := IP{0x20, 0x1, 0xd, 0xb8, 0, 0, 0, 0, 0, 0xa, 0, 0xb, 0, 0xc, 0, 0xd}
+		for range b.N {
+			_, _ = ip.MarshalText()
+		}
+	})
+	b.Run("IPv6_long", func(b *testing.B) {
+		b.ReportAllocs()
+		b.ResetTimer()
+		// fd7a:115c:a1e0:ab12:4843:cd96:626b:430b
+		ip := IP{253, 122, 17, 92, 161, 224, 171, 18, 72, 67, 205, 150, 98, 107, 67, 11}
+		for range b.N {
+			_, _ = ip.MarshalText()
+		}
+	})
+}
+
 var sink string
 
 func BenchmarkIPString(b *testing.B) {
diff --git a/src/net/lookup.go b/src/net/lookup.go
index b04dfa23..f94fd8ce 100644
--- a/src/net/lookup.go
+++ b/src/net/lookup.go
@@ -614,6 +614,9 @@ func (r *Resolver) LookupNS(ctx context.Context, name string) ([]*NS, error) {
 
 // LookupTXT returns the DNS TXT records for the given domain name.
 //
+// If a DNS TXT record holds multiple strings, they are concatenated as a
+// single string.
+//
 // LookupTXT uses [context.Background] internally; to specify the context, use
 // [Resolver.LookupTXT].
 func LookupTXT(name string) ([]string, error) {
@@ -621,6 +624,9 @@ func LookupTXT(name string) ([]string, error) {
 }
 
 // LookupTXT returns the DNS TXT records for the given domain name.
+//
+// If a DNS TXT record holds multiple strings, they are concatenated as a
+// single string.
 func (r *Resolver) LookupTXT(ctx context.Context, name string) ([]string, error) {
 	return r.lookupTXT(ctx, name)
 }
diff --git a/src/net/lookup_test.go b/src/net/lookup_test.go
index 7052f3c9..514cbd09 100644
--- a/src/net/lookup_test.go
+++ b/src/net/lookup_test.go
@@ -246,14 +246,10 @@ func TestLookupGmailTXT(t *testing.T) {
 		if len(txts) == 0 {
 			t.Error("got no record")
 		}
-		found := false
-		for _, txt := range txts {
-			if strings.Contains(txt, tt.txt) && (strings.HasSuffix(txt, tt.host) || strings.HasSuffix(txt, tt.host+".")) {
-				found = true
-				break
-			}
-		}
-		if !found {
+
+		if !slices.ContainsFunc(txts, func(txt string) bool {
+			return strings.Contains(txt, tt.txt) && (strings.HasSuffix(txt, tt.host) || strings.HasSuffix(txt, tt.host+"."))
+		}) {
 			t.Errorf("got %v; want a record containing %s, %s", txts, tt.txt, tt.host)
 		}
 	}
@@ -302,14 +298,7 @@ func TestLookupIPv6LinkLocalAddr(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	found := false
-	for _, addr := range addrs {
-		if addr == "fe80::1%lo0" {
-			found = true
-			break
-		}
-	}
-	if !found {
+	if !slices.Contains(addrs, "fe80::1%lo0") {
 		t.Skipf("not supported on %s", runtime.GOOS)
 	}
 	if _, err := LookupAddr("fe80::1%lo0"); err != nil {
@@ -433,7 +422,7 @@ func TestLookupLongTXT(t *testing.T) {
 		strings.Repeat("abcdefghijklmnopqrstuvwxyABCDEFGHJIKLMNOPQRSTUVWXY", 10),
 		"gophers rule",
 	}
-	if !reflect.DeepEqual(txts, want) {
+	if !slices.Equal(txts, want) {
 		t.Fatalf("LookupTXT golang.rsc.io incorrect\nhave %q\nwant %q", txts, want)
 	}
 }
diff --git a/src/net/lookup_windows_test.go b/src/net/lookup_windows_test.go
index 8f6e4b23..4f287901 100644
--- a/src/net/lookup_windows_test.go
+++ b/src/net/lookup_windows_test.go
@@ -144,7 +144,7 @@ func TestNSLookupTXT(t *testing.T) {
 		}
 		slices.Sort(expected)
 		slices.Sort(txt)
-		if !reflect.DeepEqual(expected, txt) {
+		if !slices.Equal(expected, txt) {
 			t.Errorf("different results %s:\texp:%v\tgot:%v", server, toJson(expected), toJson(txt))
 		}
 	})
@@ -170,7 +170,7 @@ func TestLookupLocalPTR(t *testing.T) {
 	}
 	slices.Sort(expected)
 	slices.Sort(names)
-	if !reflect.DeepEqual(expected, names) {
+	if !slices.Equal(expected, names) {
 		t.Errorf("different results %s:\texp:%v\tgot:%v", addr, toJson(expected), toJson(names))
 	}
 }
@@ -201,7 +201,7 @@ func TestLookupPTR(t *testing.T) {
 		}
 		slices.Sort(expected)
 		slices.Sort(names)
-		if !reflect.DeepEqual(expected, names) {
+		if !slices.Equal(expected, names) {
 			t.Errorf("different results %s:\texp:%v\tgot:%v", addr, toJson(expected), toJson(names))
 		}
 	}
diff --git a/src/net/mail/example_test.go b/src/net/mail/example_test.go
index d325dc79..9fadda24 100644
--- a/src/net/mail/example_test.go
+++ b/src/net/mail/example_test.go
@@ -10,6 +10,7 @@ import (
 	"log"
 	"net/mail"
 	"strings"
+	"time"
 )
 
 func ExampleParseAddressList() {
@@ -75,3 +76,17 @@ Message body
 	// Subject: Gophers at Gophercon
 	// Message body
 }
+
+func ExampleParseDate() {
+	dateStr := "Wed, 09 Oct 2024 09:55:06 -0700"
+
+	t, err := mail.ParseDate(dateStr)
+	if err != nil {
+		log.Fatalf("Failed to parse date: %v", err)
+	}
+
+	fmt.Println(t.Format(time.RFC3339))
+
+	// Output:
+	// 2024-10-09T09:55:06-07:00
+}
diff --git a/src/net/mail/message_test.go b/src/net/mail/message_test.go
index 012d51c3..dad9c367 100644
--- a/src/net/mail/message_test.go
+++ b/src/net/mail/message_test.go
@@ -9,6 +9,7 @@ import (
 	"io"
 	"mime"
 	"reflect"
+	"slices"
 	"strings"
 	"testing"
 	"time"
@@ -115,7 +116,7 @@ func headerEq(a, b Header) bool {
 		if !ok {
 			return false
 		}
-		if !reflect.DeepEqual(as, bs) {
+		if !slices.Equal(as, bs) {
 			return false
 		}
 	}
diff --git a/src/net/mptcpsock_linux.go b/src/net/mptcpsock_linux.go
index b2ac3ee7..42230904 100644
--- a/src/net/mptcpsock_linux.go
+++ b/src/net/mptcpsock_linux.go
@@ -16,7 +16,7 @@ import (
 var (
 	mptcpOnce      sync.Once
 	mptcpAvailable bool
-	hasSOLMPTCP    bool
+	hasSOLMPTCP    bool // only valid if mptcpAvailable is true
 )
 
 // These constants aren't in the syscall package, which is frozen
@@ -34,10 +34,17 @@ func supportsMultipathTCP() bool {
 // Check that MPTCP is supported by attempting to create an MPTCP socket and by
 // looking at the returned error if any.
 func initMPTCPavailable() {
-	s, err := sysSocket(syscall.AF_INET, syscall.SOCK_STREAM, _IPPROTO_MPTCP)
+	family := syscall.AF_INET
+	if !supportsIPv4() {
+		family = syscall.AF_INET6
+	}
+	s, err := sysSocket(family, syscall.SOCK_STREAM, _IPPROTO_MPTCP)
+
 	switch {
 	case errors.Is(err, syscall.EPROTONOSUPPORT): // Not supported: >= v5.6
+		return
 	case errors.Is(err, syscall.EINVAL): // Not supported: < v5.6
+		return
 	case err == nil: // Supported and no error
 		poll.CloseFunc(s)
 		fallthrough
@@ -119,6 +126,10 @@ func isUsingMPTCPProto(fd *netFD) bool {
 // Please look at the description of hasFallenBack (kernel >=5.16) and
 // isUsingMPTCPProto methods for more details about what is being checked here.
 func isUsingMultipathTCP(fd *netFD) bool {
+	if !supportsMultipathTCP() {
+		return false
+	}
+
 	if hasSOLMPTCP {
 		return !hasFallenBack(fd)
 	}
diff --git a/src/net/net.go b/src/net/net.go
index f8b5834a..82dc222d 100644
--- a/src/net/net.go
+++ b/src/net/net.go
@@ -68,6 +68,11 @@ GODEBUG environment variable (see package runtime) to go or cgo, as in:
 
 The decision can also be forced while building the Go source tree
 by setting the netgo or netcgo build tag.
+The netgo build tag disables entirely the use of the native (CGO) resolver,
+meaning the Go resolver is the only one that can be used.
+With the netcgo build tag the native and the pure Go resolver are compiled into the binary,
+but the native (CGO) resolver is preferred over the Go resolver.
+With netcgo, the Go resolver can still be forced at runtime with GODEBUG=netdns=go.
 
 A numeric netdns setting, as in GODEBUG=netdns=1, causes the resolver
 to print debugging information about its decisions.
diff --git a/src/net/netip/netip.go b/src/net/netip/netip.go
index a1e93cb2..35abfd32 100644
--- a/src/net/netip/netip.go
+++ b/src/net/netip/netip.go
@@ -102,8 +102,8 @@ func AddrFrom4(addr [4]byte) Addr {
 func AddrFrom16(addr [16]byte) Addr {
 	return Addr{
 		addr: uint128{
-			byteorder.BeUint64(addr[:8]),
-			byteorder.BeUint64(addr[8:]),
+			byteorder.BEUint64(addr[:8]),
+			byteorder.BEUint64(addr[8:]),
 		},
 		z: z6noz,
 	}
@@ -462,7 +462,9 @@ func (ip Addr) Is4() bool {
 	return ip.z == z4
 }
 
-// Is4In6 reports whether ip is an IPv4-mapped IPv6 address.
+// Is4In6 reports whether ip is an "IPv4-mapped IPv6 address"
+// as defined by RFC 4291.
+// That is, it reports whether ip is in ::ffff:0:0/96.
 func (ip Addr) Is4In6() bool {
 	return ip.Is6() && ip.addr.hi == 0 && ip.addr.lo>>32 == 0xffff
 }
@@ -700,8 +702,8 @@ func (ip Addr) Prefix(b int) (Prefix, error) {
 // [Addr.Zone] method to get it).
 // The ip zero value returns all zeroes.
 func (ip Addr) As16() (a16 [16]byte) {
-	byteorder.BePutUint64(a16[:8], ip.addr.hi)
-	byteorder.BePutUint64(a16[8:], ip.addr.lo)
+	byteorder.BEPutUint64(a16[:8], ip.addr.hi)
+	byteorder.BEPutUint64(a16[8:], ip.addr.lo)
 	return a16
 }
 
@@ -710,7 +712,7 @@ func (ip Addr) As16() (a16 [16]byte) {
 // Note that 0.0.0.0 is not the zero Addr.
 func (ip Addr) As4() (a4 [4]byte) {
 	if ip.z == z4 || ip.Is4In6() {
-		byteorder.BePutUint32(a4[:], uint32(ip.addr.lo))
+		byteorder.BEPutUint32(a4[:], uint32(ip.addr.lo))
 		return a4
 	}
 	if ip.z == z0 {
@@ -726,12 +728,12 @@ func (ip Addr) AsSlice() []byte {
 		return nil
 	case z4:
 		var ret [4]byte
-		byteorder.BePutUint32(ret[:], uint32(ip.addr.lo))
+		byteorder.BEPutUint32(ret[:], uint32(ip.addr.lo))
 		return ret[:]
 	default:
 		var ret [16]byte
-		byteorder.BePutUint64(ret[:8], ip.addr.hi)
-		byteorder.BePutUint64(ret[8:], ip.addr.lo)
+		byteorder.BEPutUint64(ret[:8], ip.addr.hi)
+		byteorder.BEPutUint64(ret[8:], ip.addr.lo)
 		return ret[:]
 	}
 }
@@ -966,27 +968,32 @@ func (ip Addr) StringExpanded() string {
 	return string(ret)
 }
 
+// AppendText implements the [encoding.TextAppender] interface,
+// It is the same as [Addr.AppendTo].
+func (ip Addr) AppendText(b []byte) ([]byte, error) {
+	return ip.AppendTo(b), nil
+}
+
 // MarshalText implements the [encoding.TextMarshaler] interface,
 // The encoding is the same as returned by [Addr.String], with one exception:
 // If ip is the zero [Addr], the encoding is the empty string.
 func (ip Addr) MarshalText() ([]byte, error) {
+	buf := []byte{}
 	switch ip.z {
 	case z0:
-		return []byte(""), nil
 	case z4:
-		max := len("255.255.255.255")
-		b := make([]byte, 0, max)
-		return ip.appendTo4(b), nil
+		const maxCap = len("255.255.255.255")
+		buf = make([]byte, 0, maxCap)
 	default:
 		if ip.Is4In6() {
-			max := len("::ffff:255.255.255.255%enp5s0")
-			b := make([]byte, 0, max)
-			return ip.appendTo4In6(b), nil
+			const maxCap = len("::ffff:255.255.255.255%enp5s0")
+			buf = make([]byte, 0, maxCap)
+			break
 		}
-		max := len("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff%enp5s0")
-		b := make([]byte, 0, max)
-		return ip.appendTo6(b), nil
+		const maxCap = len("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff%enp5s0")
+		buf = make([]byte, 0, maxCap)
 	}
+	return ip.AppendText(buf)
 }
 
 // UnmarshalText implements the encoding.TextUnmarshaler interface.
@@ -1004,22 +1011,29 @@ func (ip *Addr) UnmarshalText(text []byte) error {
 	return err
 }
 
-func (ip Addr) marshalBinaryWithTrailingBytes(trailingBytes int) []byte {
-	var b []byte
+// AppendBinary implements the [encoding.BinaryAppender] interface.
+func (ip Addr) AppendBinary(b []byte) ([]byte, error) {
 	switch ip.z {
 	case z0:
-		b = make([]byte, trailingBytes)
 	case z4:
-		b = make([]byte, 4+trailingBytes)
-		byteorder.BePutUint32(b, uint32(ip.addr.lo))
+		b = byteorder.BEAppendUint32(b, uint32(ip.addr.lo))
 	default:
-		z := ip.Zone()
-		b = make([]byte, 16+len(z)+trailingBytes)
-		byteorder.BePutUint64(b[:8], ip.addr.hi)
-		byteorder.BePutUint64(b[8:], ip.addr.lo)
-		copy(b[16:], z)
+		b = byteorder.BEAppendUint64(b, ip.addr.hi)
+		b = byteorder.BEAppendUint64(b, ip.addr.lo)
+		b = append(b, ip.Zone()...)
+	}
+	return b, nil
+}
+
+func (ip Addr) marshalBinarySize() int {
+	switch ip.z {
+	case z0:
+		return 0
+	case z4:
+		return 4
+	default:
+		return 16 + len(ip.Zone())
 	}
-	return b
 }
 
 // MarshalBinary implements the [encoding.BinaryMarshaler] interface.
@@ -1027,7 +1041,7 @@ func (ip Addr) marshalBinaryWithTrailingBytes(trailingBytes int) []byte {
 // the 4-byte form for an IPv4 address,
 // and the 16-byte form with zone appended for an IPv6 address.
 func (ip Addr) MarshalBinary() ([]byte, error) {
-	return ip.marshalBinaryWithTrailingBytes(0), nil
+	return ip.AppendBinary(make([]byte, 0, ip.marshalBinarySize()))
 }
 
 // UnmarshalBinary implements the [encoding.BinaryUnmarshaler] interface.
@@ -1198,21 +1212,27 @@ func (p AddrPort) AppendTo(b []byte) []byte {
 	return b
 }
 
+// AppendText implements the [encoding.TextAppender] interface. The
+// encoding is the same as returned by [AddrPort.AppendTo].
+func (p AddrPort) AppendText(b []byte) ([]byte, error) {
+	return p.AppendTo(b), nil
+}
+
 // MarshalText implements the [encoding.TextMarshaler] interface. The
 // encoding is the same as returned by [AddrPort.String], with one exception: if
 // p.Addr() is the zero [Addr], the encoding is the empty string.
 func (p AddrPort) MarshalText() ([]byte, error) {
-	var max int
+	buf := []byte{}
 	switch p.ip.z {
 	case z0:
 	case z4:
-		max = len("255.255.255.255:65535")
+		const maxCap = len("255.255.255.255:65535")
+		buf = make([]byte, 0, maxCap)
 	default:
-		max = len("[ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff%enp5s0]:65535")
+		const maxCap = len("[ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff%enp5s0]:65535")
+		buf = make([]byte, 0, maxCap)
 	}
-	b := make([]byte, 0, max)
-	b = p.AppendTo(b)
-	return b, nil
+	return p.AppendText(buf)
 }
 
 // UnmarshalText implements the encoding.TextUnmarshaler
@@ -1228,13 +1248,22 @@ func (p *AddrPort) UnmarshalText(text []byte) error {
 	return err
 }
 
+// AppendBinary implements the [encoding.BinaryAppendler] interface.
+// It returns [Addr.AppendBinary] with an additional two bytes appended
+// containing the port in little-endian.
+func (p AddrPort) AppendBinary(b []byte) ([]byte, error) {
+	b, err := p.Addr().AppendBinary(b)
+	if err != nil {
+		return nil, err
+	}
+	return byteorder.LEAppendUint16(b, p.Port()), nil
+}
+
 // MarshalBinary implements the [encoding.BinaryMarshaler] interface.
 // It returns [Addr.MarshalBinary] with an additional two bytes appended
 // containing the port in little-endian.
 func (p AddrPort) MarshalBinary() ([]byte, error) {
-	b := p.Addr().marshalBinaryWithTrailingBytes(2)
-	byteorder.LePutUint16(b[len(b)-2:], p.Port())
-	return b, nil
+	return p.AppendBinary(make([]byte, 0, p.Addr().marshalBinarySize()+2))
 }
 
 // UnmarshalBinary implements the [encoding.BinaryUnmarshaler] interface.
@@ -1248,7 +1277,7 @@ func (p *AddrPort) UnmarshalBinary(b []byte) error {
 	if err != nil {
 		return err
 	}
-	*p = AddrPortFrom(addr, byteorder.LeUint16(b[len(b)-2:]))
+	*p = AddrPortFrom(addr, byteorder.LEUint16(b[len(b)-2:]))
 	return nil
 }
 
@@ -1487,21 +1516,27 @@ func (p Prefix) AppendTo(b []byte) []byte {
 	return b
 }
 
+// AppendText implements the [encoding.TextAppender] interface.
+// It is the same as [Prefix.AppendTo].
+func (p Prefix) AppendText(b []byte) ([]byte, error) {
+	return p.AppendTo(b), nil
+}
+
 // MarshalText implements the [encoding.TextMarshaler] interface,
 // The encoding is the same as returned by [Prefix.String], with one exception:
 // If p is the zero value, the encoding is the empty string.
 func (p Prefix) MarshalText() ([]byte, error) {
-	var max int
+	buf := []byte{}
 	switch p.ip.z {
 	case z0:
 	case z4:
-		max = len("255.255.255.255/32")
+		const maxCap = len("255.255.255.255/32")
+		buf = make([]byte, 0, maxCap)
 	default:
-		max = len("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff%enp5s0/128")
+		const maxCap = len("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff%enp5s0/128")
+		buf = make([]byte, 0, maxCap)
 	}
-	b := make([]byte, 0, max)
-	b = p.AppendTo(b)
-	return b, nil
+	return p.AppendText(buf)
 }
 
 // UnmarshalText implements the encoding.TextUnmarshaler interface.
@@ -1517,13 +1552,23 @@ func (p *Prefix) UnmarshalText(text []byte) error {
 	return err
 }
 
+// AppendBinary implements the [encoding.AppendMarshaler] interface.
+// It returns [Addr.AppendBinary] with an additional byte appended
+// containing the prefix bits.
+func (p Prefix) AppendBinary(b []byte) ([]byte, error) {
+	b, err := p.Addr().withoutZone().AppendBinary(b)
+	if err != nil {
+		return nil, err
+	}
+	return append(b, uint8(p.Bits())), nil
+}
+
 // MarshalBinary implements the [encoding.BinaryMarshaler] interface.
 // It returns [Addr.MarshalBinary] with an additional byte appended
 // containing the prefix bits.
 func (p Prefix) MarshalBinary() ([]byte, error) {
-	b := p.Addr().withoutZone().marshalBinaryWithTrailingBytes(1)
-	b[len(b)-1] = uint8(p.Bits())
-	return b, nil
+	// without the zone the max length is 16, plus an additional byte is 17
+	return p.AppendBinary(make([]byte, 0, p.Addr().withoutZone().marshalBinarySize()+1))
 }
 
 // UnmarshalBinary implements the [encoding.BinaryUnmarshaler] interface.
diff --git a/src/net/netip/netip_test.go b/src/net/netip/netip_test.go
index e1a0a83f..ea03f9a9 100644
--- a/src/net/netip/netip_test.go
+++ b/src/net/netip/netip_test.go
@@ -9,6 +9,7 @@ import (
 	"encoding/json"
 	"flag"
 	"fmt"
+	"internal/asan"
 	"internal/testenv"
 	"net"
 	. "net/netip"
@@ -351,6 +352,32 @@ func TestIPv4Constructors(t *testing.T) {
 	}
 }
 
+func TestAddrAppendText(t *testing.T) {
+	tests := []struct {
+		ip   Addr
+		want string
+	}{
+		{Addr{}, ""}, // zero IP
+		{mustIP("1.2.3.4"), "1.2.3.4"},
+		{mustIP("fd7a:115c:a1e0:ab12:4843:cd96:626b:430b"), "fd7a:115c:a1e0:ab12:4843:cd96:626b:430b"},
+		{mustIP("::ffff:192.168.140.255"), "::ffff:192.168.140.255"},
+		{mustIP("::ffff:192.168.140.255%en0"), "::ffff:192.168.140.255%en0"},
+	}
+	for i, tc := range tests {
+		ip := tc.ip
+
+		mtAppend := make([]byte, 4, 32)
+		mtAppend, err := ip.AppendText(mtAppend)
+		mtAppend = mtAppend[4:]
+		if err != nil {
+			t.Fatal(err)
+		}
+		if string(mtAppend) != tc.want {
+			t.Errorf("%d. for (%v) AppendText = %q; want %q", i, ip, mtAppend, tc.want)
+		}
+	}
+}
+
 func TestAddrMarshalUnmarshalBinary(t *testing.T) {
 	tests := []struct {
 		ip       string
@@ -381,6 +408,23 @@ func TestAddrMarshalUnmarshalBinary(t *testing.T) {
 		if ip != ip2 {
 			t.Fatalf("got %v; want %v", ip2, ip)
 		}
+
+		bAppend := make([]byte, 4, 32)
+		bAppend, err = ip.AppendBinary(bAppend)
+		bAppend = bAppend[4:]
+		if err != nil {
+			t.Fatal(err)
+		}
+		if len(bAppend) != tc.wantSize {
+			t.Fatalf("%q encoded to size %d; want %d", tc.ip, len(bAppend), tc.wantSize)
+		}
+		var ip3 Addr
+		if err := ip3.UnmarshalBinary(bAppend); err != nil {
+			t.Fatal(err)
+		}
+		if ip != ip3 {
+			t.Fatalf("got %v; want %v", ip3, ip)
+		}
 	}
 
 	// Cannot unmarshal from unexpected IP length.
@@ -416,6 +460,17 @@ func TestAddrPortMarshalTextString(t *testing.T) {
 		if string(mt) != tt.want {
 			t.Errorf("%d. for (%v, %v) MarshalText = %q; want %q", i, tt.in.Addr(), tt.in.Port(), mt, tt.want)
 		}
+
+		mtAppend := make([]byte, 4, 32)
+		mtAppend, err = tt.in.AppendText(mtAppend)
+		mtAppend = mtAppend[4:]
+		if err != nil {
+			t.Errorf("%d. for (%v, %v) AppendText error: %v", i, tt.in.Addr(), tt.in.Port(), err)
+			continue
+		}
+		if string(mtAppend) != tt.want {
+			t.Errorf("%d. for (%v, %v) AppendText = %q; want %q", i, tt.in.Addr(), tt.in.Port(), mtAppend, tt.want)
+		}
 	}
 }
 
@@ -448,6 +503,23 @@ func TestAddrPortMarshalUnmarshalBinary(t *testing.T) {
 		if ipport != ipport2 {
 			t.Fatalf("got %v; want %v", ipport2, ipport)
 		}
+
+		bAppend := make([]byte, 4, 32)
+		bAppend, err = ipport.AppendBinary(bAppend)
+		bAppend = bAppend[4:]
+		if err != nil {
+			t.Fatal(err)
+		}
+		if len(bAppend) != tc.wantSize {
+			t.Fatalf("%q encoded to size %d; want %d", tc.ipport, len(bAppend), tc.wantSize)
+		}
+		var ipport3 AddrPort
+		if err := ipport3.UnmarshalBinary(bAppend); err != nil {
+			t.Fatal(err)
+		}
+		if ipport != ipport3 {
+			t.Fatalf("got %v; want %v", ipport3, ipport)
+		}
 	}
 
 	// Cannot unmarshal from unexpected lengths.
@@ -482,6 +554,17 @@ func TestPrefixMarshalTextString(t *testing.T) {
 		if string(mt) != tt.want {
 			t.Errorf("%d. for %v MarshalText = %q; want %q", i, tt.in, mt, tt.want)
 		}
+
+		mtAppend := make([]byte, 4, 64)
+		mtAppend, err = tt.in.AppendText(mtAppend)
+		mtAppend = mtAppend[4:]
+		if err != nil {
+			t.Errorf("%d. for %v AppendText error: %v", i, tt.in, err)
+			continue
+		}
+		if string(mtAppend) != tt.want {
+			t.Errorf("%d. for %v AppendText = %q; want %q", i, tt.in, mtAppend, tt.want)
+		}
 	}
 }
 
@@ -515,6 +598,23 @@ func TestPrefixMarshalUnmarshalBinary(t *testing.T) {
 		if prefix != prefix2 {
 			t.Fatalf("got %v; want %v", prefix2, prefix)
 		}
+
+		bAppend := make([]byte, 4, 32)
+		bAppend, err = prefix.AppendBinary(bAppend)
+		bAppend = bAppend[4:]
+		if err != nil {
+			t.Fatal(err)
+		}
+		if len(bAppend) != tc.wantSize {
+			t.Fatalf("%q encoded to size %d; want %d", tc.prefix, len(bAppend), tc.wantSize)
+		}
+		var prefix3 Prefix
+		if err := prefix3.UnmarshalBinary(bAppend); err != nil {
+			t.Fatal(err)
+		}
+		if prefix != prefix3 {
+			t.Fatalf("got %v; want %v", prefix3, prefix)
+		}
 	}
 
 	// Cannot unmarshal from unexpected lengths.
@@ -2033,6 +2133,10 @@ var (
 )
 
 func TestNoAllocs(t *testing.T) {
+	if asan.Enabled {
+		t.Skip("test allocates more with -asan; see #70079")
+	}
+
 	// Wrappers that panic on error, to prove that our alloc-free
 	// methods are returning successfully.
 	panicIP := func(ip Addr, err error) Addr {
@@ -2179,11 +2283,14 @@ func TestPrefixString(t *testing.T) {
 	}
 }
 
-func TestInvalidAddrPortString(t *testing.T) {
+func TestAddrPortString(t *testing.T) {
 	tests := []struct {
 		ipp  AddrPort
 		want string
 	}{
+		{MustParseAddrPort("127.0.0.1:80"), "127.0.0.1:80"},
+		{MustParseAddrPort("[0000::0]:8080"), "[::]:8080"},
+		{MustParseAddrPort("[FFFF::1]:8080"), "[ffff::1]:8080"},
 		{AddrPort{}, "invalid AddrPort"},
 		{AddrPortFrom(Addr{}, 80), "invalid AddrPort"},
 	}
diff --git a/src/net/resolverdialfunc_test.go b/src/net/resolverdialfunc_test.go
index 9b45cdbc..3e8d7752 100644
--- a/src/net/resolverdialfunc_test.go
+++ b/src/net/resolverdialfunc_test.go
@@ -59,7 +59,7 @@ func TestResolverDialFunc(t *testing.T) {
 		if err != nil {
 			t.Fatal(err)
 		}
-		if got, want := sortedIPStrings(ips), []string{"0:200::e00", "1.2.3.4", "1::f", "5.6.7.8"}; !reflect.DeepEqual(got, want) {
+		if got, want := sortedIPStrings(ips), []string{"0:200::e00", "1.2.3.4", "1::f", "5.6.7.8"}; !slices.Equal(got, want) {
 			t.Errorf("LookupIP wrong.\n got: %q\nwant: %q\n", got, want)
 		}
 	})
diff --git a/src/net/sendfile_linux.go b/src/net/sendfile_linux.go
index f8a7bec8..75af6174 100644
--- a/src/net/sendfile_linux.go
+++ b/src/net/sendfile_linux.go
@@ -20,7 +20,7 @@ const supportsSendfile = true
 //
 // if handled == false, sendFile performed no work.
 func sendFile(c *netFD, r io.Reader) (written int64, err error, handled bool) {
-	var remain int64 = 1<<63 - 1 // by default, copy until EOF
+	var remain int64 = 0 // 0 indicates sending until EOF
 
 	lr, ok := r.(*io.LimitedReader)
 	if ok {
diff --git a/src/net/sendfile_test.go b/src/net/sendfile_test.go
index 4f341156..8f98352e 100644
--- a/src/net/sendfile_test.go
+++ b/src/net/sendfile_test.go
@@ -13,6 +13,7 @@ import (
 	"fmt"
 	"internal/poll"
 	"io"
+	"math/rand"
 	"os"
 	"runtime"
 	"strconv"
@@ -46,6 +47,7 @@ func expectSendfile(t *testing.T, wantConn Conn, f func()) {
 		called     bool
 		gotHandled bool
 		gotFD      *poll.FD
+		gotErr     error
 	)
 	poll.TestHookDidSendFile = func(dstFD *poll.FD, src int, written int64, err error, handled bool) {
 		if called {
@@ -54,6 +56,7 @@ func expectSendfile(t *testing.T, wantConn Conn, f func()) {
 		called = true
 		gotHandled = handled
 		gotFD = dstFD
+		gotErr = err
 	}
 	f()
 	if !called {
@@ -61,7 +64,7 @@ func expectSendfile(t *testing.T, wantConn Conn, f func()) {
 		return
 	}
 	if !gotHandled {
-		t.Error("internal/poll.SendFile did not handle the write, want it to")
+		t.Error("internal/poll.SendFile did not handle the write, want it to, error:", gotErr)
 		return
 	}
 	if &wantConn.(*TCPConn).fd.pfd != gotFD {
@@ -69,7 +72,33 @@ func expectSendfile(t *testing.T, wantConn Conn, f func()) {
 	}
 }
 
-func TestSendfile(t *testing.T) {
+func TestSendfile(t *testing.T) { testSendfile(t, newton, newtonSHA256, newtonLen, 0) }
+func TestSendfileWithExactLimit(t *testing.T) {
+	testSendfile(t, newton, newtonSHA256, newtonLen, newtonLen)
+}
+func TestSendfileWithLimitLargerThanFile(t *testing.T) {
+	testSendfile(t, newton, newtonSHA256, newtonLen, newtonLen*2)
+}
+func TestSendfileWithLargeFile(t *testing.T) {
+	// Some platforms are not capable of handling large files with sendfile
+	// due to limited system resource, so we only run this test on amd64 and
+	// arm64 for the moment.
+	if runtime.GOARCH != "amd64" && runtime.GOARCH != "arm64" {
+		t.Skip("skipping on non-amd64 and non-arm64 platforms")
+	}
+	// Also skip it during short testing.
+	if testing.Short() {
+		t.Skip("Skip it during short testing")
+	}
+
+	// We're using 1<<31 - 1 as the chunk size for sendfile currently,
+	// make an edge case file that is 1 byte bigger than that.
+	f := createTempFile(t, 1<<31)
+	// For big file like this, only verify the transmission of the file,
+	// skip the content check.
+	testSendfile(t, f.Name(), "", 1<<31, 0)
+}
+func testSendfile(t *testing.T, filePath, fileHash string, size, limit int64) {
 	ln := newLocalListener(t, "tcp")
 	defer ln.Close()
 
@@ -87,7 +116,7 @@ func TestSendfile(t *testing.T) {
 			defer close(errc)
 			defer conn.Close()
 
-			f, err := os.Open(newton)
+			f, err := os.Open(filePath)
 			if err != nil {
 				errc <- err
 				return
@@ -104,7 +133,14 @@ func TestSendfile(t *testing.T) {
 				sbytes, err = io.Copy(conn, f)
 			default:
 				expectSendfile(t, conn, func() {
-					sbytes, err = io.Copy(conn, f)
+					if limit > 0 {
+						sbytes, err = io.CopyN(conn, f, limit)
+						if err == io.EOF && limit > size {
+							err = nil
+						}
+					} else {
+						sbytes, err = io.Copy(conn, f)
+					}
 				})
 			}
 			if err != nil {
@@ -112,8 +148,8 @@ func TestSendfile(t *testing.T) {
 				return
 			}
 
-			if sbytes != newtonLen {
-				errc <- fmt.Errorf("sent %d bytes; expected %d", sbytes, newtonLen)
+			if sbytes != size {
+				errc <- fmt.Errorf("sent %d bytes; expected %d", sbytes, size)
 				return
 			}
 		}()
@@ -133,11 +169,11 @@ func TestSendfile(t *testing.T) {
 		t.Error(err)
 	}
 
-	if rbytes != newtonLen {
-		t.Errorf("received %d bytes; expected %d", rbytes, newtonLen)
+	if rbytes != size {
+		t.Errorf("received %d bytes; expected %d", rbytes, size)
 	}
 
-	if res := hex.EncodeToString(h.Sum(nil)); res != newtonSHA256 {
+	if len(fileHash) > 0 && hex.EncodeToString(h.Sum(nil)) != newtonSHA256 {
 		t.Error("retrieved data hash did not match")
 	}
 
@@ -542,7 +578,7 @@ type sendFileBench struct {
 
 func (bench sendFileBench) benchSendFile(b *testing.B) {
 	fileSize := b.N * bench.chunkSize
-	f := createTempFile(b, fileSize)
+	f := createTempFile(b, int64(fileSize))
 
 	client, server := spawnTestSocketPair(b, bench.proto)
 	defer server.Close()
@@ -568,25 +604,27 @@ func (bench sendFileBench) benchSendFile(b *testing.B) {
 	}
 }
 
-func createTempFile(b *testing.B, size int) *os.File {
-	f, err := os.CreateTemp(b.TempDir(), "sendfile-bench")
+func createTempFile(tb testing.TB, size int64) *os.File {
+	f, err := os.CreateTemp(tb.TempDir(), "sendfile-bench")
 	if err != nil {
-		b.Fatalf("failed to create temporary file: %v", err)
+		tb.Fatalf("failed to create temporary file: %v", err)
 	}
-	b.Cleanup(func() {
+	tb.Cleanup(func() {
 		f.Close()
 	})
 
-	data := make([]byte, size)
-	if _, err := f.Write(data); err != nil {
-		b.Fatalf("failed to create and feed the file: %v", err)
-	}
-	if err := f.Sync(); err != nil {
-		b.Fatalf("failed to save the file: %v", err)
+	if _, err := io.CopyN(f, newRandReader(tb), size); err != nil {
+		tb.Fatalf("failed to fill the file with random data: %v", err)
 	}
 	if _, err := f.Seek(0, io.SeekStart); err != nil {
-		b.Fatalf("failed to rewind the file: %v", err)
+		tb.Fatalf("failed to rewind the file: %v", err)
 	}
 
 	return f
 }
+
+func newRandReader(tb testing.TB) io.Reader {
+	seed := time.Now().UnixNano()
+	tb.Logf("Deterministic RNG seed based on timestamp: 0x%x", seed)
+	return rand.New(rand.NewSource(seed))
+}
diff --git a/src/net/sendfile_unix_alt.go b/src/net/sendfile_unix_alt.go
index 4056856f..db788753 100644
--- a/src/net/sendfile_unix_alt.go
+++ b/src/net/sendfile_unix_alt.go
@@ -9,7 +9,6 @@ package net
 import (
 	"internal/poll"
 	"io"
-	"io/fs"
 	"syscall"
 )
 
@@ -23,13 +22,7 @@ const supportsSendfile = true
 //
 // if handled == false, sendFile performed no work.
 func sendFile(c *netFD, r io.Reader) (written int64, err error, handled bool) {
-	// Darwin, FreeBSD, DragonFly and Solaris use 0 as the "until EOF" value.
-	// If you pass in more bytes than the file contains, it will
-	// loop back to the beginning ad nauseam until it's sent
-	// exactly the number of bytes told to. As such, we need to
-	// know exactly how many bytes to send.
-	var remain int64 = 0
-
+	var remain int64 = 0 // 0 writes the entire file
 	lr, ok := r.(*io.LimitedReader)
 	if ok {
 		remain, r = lr.N, lr.R
@@ -39,37 +32,11 @@ func sendFile(c *netFD, r io.Reader) (written int64, err error, handled bool) {
 	}
 	// r might be an *os.File or an os.fileWithoutWriteTo.
 	// Type assert to an interface rather than *os.File directly to handle the latter case.
-	f, ok := r.(interface {
-		fs.File
-		io.Seeker
-		syscall.Conn
-	})
+	f, ok := r.(syscall.Conn)
 	if !ok {
 		return 0, nil, false
 	}
 
-	if remain == 0 {
-		fi, err := f.Stat()
-		if err != nil {
-			return 0, err, false
-		}
-		if fi.Mode()&(fs.ModeSymlink|fs.ModeDevice|fs.ModeCharDevice|fs.ModeIrregular) != 0 {
-			return 0, nil, false
-		}
-
-		remain = fi.Size()
-	}
-
-	// The other quirk with Darwin/FreeBSD/DragonFly/Solaris's sendfile
-	// implementation is that it doesn't use the current position
-	// of the file -- if you pass it offset 0, it starts from
-	// offset 0. There's no way to tell it "start from current
-	// position", so we have to manage that explicitly.
-	pos, err := f.Seek(0, io.SeekCurrent)
-	if err != nil {
-		return 0, err, false
-	}
-
 	sc, err := f.SyscallConn()
 	if err != nil {
 		return 0, nil, false
@@ -77,7 +44,7 @@ func sendFile(c *netFD, r io.Reader) (written int64, err error, handled bool) {
 
 	var werr error
 	err = sc.Read(func(fd uintptr) bool {
-		written, werr, handled = poll.SendFile(&c.pfd, int(fd), pos, remain)
+		written, werr, handled = poll.SendFile(&c.pfd, int(fd), remain)
 		return true
 	})
 	if err == nil {
@@ -88,10 +55,5 @@ func sendFile(c *netFD, r io.Reader) (written int64, err error, handled bool) {
 		lr.N = remain - written
 	}
 
-	_, err1 := f.Seek(written, io.SeekCurrent)
-	if err1 != nil && err == nil {
-		return written, err1, handled
-	}
-
 	return written, wrapSyscallError("sendfile", err), handled
 }
diff --git a/src/net/smtp/smtp.go b/src/net/smtp/smtp.go
index d750a285..522d80e4 100644
--- a/src/net/smtp/smtp.go
+++ b/src/net/smtp/smtp.go
@@ -413,9 +413,7 @@ func (c *Client) Noop() error {
 
 // Quit sends the QUIT command and closes the connection to the server.
 func (c *Client) Quit() error {
-	if err := c.hello(); err != nil {
-		return err
-	}
+	c.hello() // ignore error; we're quitting anyhow
 	_, _, err := c.cmd(221, "QUIT")
 	if err != nil {
 		return err
diff --git a/src/net/smtp/smtp_test.go b/src/net/smtp/smtp_test.go
index c91c99b1..389eda9a 100644
--- a/src/net/smtp/smtp_test.go
+++ b/src/net/smtp/smtp_test.go
@@ -288,6 +288,37 @@ Goodbye.
 QUIT
 `
 
+func TestHELOFailed(t *testing.T) {
+	serverLines := `502 EH?
+502 EH?
+221 OK
+`
+	clientLines := `EHLO localhost
+HELO localhost
+QUIT
+`
+
+	server := strings.Join(strings.Split(serverLines, "\n"), "\r\n")
+	client := strings.Join(strings.Split(clientLines, "\n"), "\r\n")
+	var cmdbuf strings.Builder
+	bcmdbuf := bufio.NewWriter(&cmdbuf)
+	var fake faker
+	fake.ReadWriter = bufio.NewReadWriter(bufio.NewReader(strings.NewReader(server)), bcmdbuf)
+	c := &Client{Text: textproto.NewConn(fake), localName: "localhost"}
+
+	if err := c.Hello("localhost"); err == nil {
+		t.Fatal("expected EHLO to fail")
+	}
+	if err := c.Quit(); err != nil {
+		t.Errorf("QUIT failed: %s", err)
+	}
+	bcmdbuf.Flush()
+	actual := cmdbuf.String()
+	if client != actual {
+		t.Errorf("Got:\n%s\nWant:\n%s", actual, client)
+	}
+}
+
 func TestExtensions(t *testing.T) {
 	fake := func(server string) (c *Client, bcmdbuf *bufio.Writer, cmdbuf *strings.Builder) {
 		server = strings.Join(strings.Split(server, "\n"), "\r\n")
diff --git a/src/net/tcpsock.go b/src/net/tcpsock.go
index f5df502f..92966b70 100644
--- a/src/net/tcpsock.go
+++ b/src/net/tcpsock.go
@@ -324,7 +324,15 @@ func DialTCP(network string, laddr, raddr *TCPAddr) (*TCPConn, error) {
 		return nil, &OpError{Op: "dial", Net: network, Source: laddr.opAddr(), Addr: nil, Err: errMissingAddress}
 	}
 	sd := &sysDialer{network: network, address: raddr.String()}
-	c, err := sd.dialTCP(context.Background(), laddr, raddr)
+	var (
+		c   *TCPConn
+		err error
+	)
+	if sd.MultipathTCP() {
+		c, err = sd.dialMPTCP(context.Background(), laddr, raddr)
+	} else {
+		c, err = sd.dialTCP(context.Background(), laddr, raddr)
+	}
 	if err != nil {
 		return nil, &OpError{Op: "dial", Net: network, Source: laddr.opAddr(), Addr: raddr.opAddr(), Err: err}
 	}
@@ -439,7 +447,15 @@ func ListenTCP(network string, laddr *TCPAddr) (*TCPListener, error) {
 		laddr = &TCPAddr{}
 	}
 	sl := &sysListener{network: network, address: laddr.String()}
-	ln, err := sl.listenTCP(context.Background(), laddr)
+	var (
+		ln  *TCPListener
+		err error
+	)
+	if sl.MultipathTCP() {
+		ln, err = sl.listenMPTCP(context.Background(), laddr)
+	} else {
+		ln, err = sl.listenTCP(context.Background(), laddr)
+	}
 	if err != nil {
 		return nil, &OpError{Op: "listen", Net: network, Source: nil, Addr: laddr.opAddr(), Err: err}
 	}
diff --git a/src/net/textproto/reader_test.go b/src/net/textproto/reader_test.go
index f794879b..d510f9b3 100644
--- a/src/net/textproto/reader_test.go
+++ b/src/net/textproto/reader_test.go
@@ -11,6 +11,7 @@ import (
 	"net"
 	"reflect"
 	"runtime"
+	"slices"
 	"strings"
 	"sync"
 	"testing"
@@ -95,13 +96,13 @@ func TestReadDotLines(t *testing.T) {
 	r := reader("dotlines\r\n.foo\r\n..bar\n...baz\nquux\r\n\r\n.\r\nanother\n")
 	s, err := r.ReadDotLines()
 	want := []string{"dotlines", "foo", ".bar", "..baz", "quux", ""}
-	if !reflect.DeepEqual(s, want) || err != nil {
+	if !slices.Equal(s, want) || err != nil {
 		t.Fatalf("ReadDotLines: %v, %v", s, err)
 	}
 
 	s, err = r.ReadDotLines()
 	want = []string{"another"}
-	if !reflect.DeepEqual(s, want) || err != io.ErrUnexpectedEOF {
+	if !slices.Equal(s, want) || err != io.ErrUnexpectedEOF {
 		t.Fatalf("ReadDotLines2: %v, %v", s, err)
 	}
 }
@@ -110,13 +111,13 @@ func TestReadDotBytes(t *testing.T) {
 	r := reader("dotlines\r\n.foo\r\n..bar\n...baz\nquux\r\n\r\n.\r\nanot.her\r\n")
 	b, err := r.ReadDotBytes()
 	want := []byte("dotlines\nfoo\n.bar\n..baz\nquux\n\n")
-	if !reflect.DeepEqual(b, want) || err != nil {
+	if !slices.Equal(b, want) || err != nil {
 		t.Fatalf("ReadDotBytes: %q, %v", b, err)
 	}
 
 	b, err = r.ReadDotBytes()
 	want = []byte("anot.her\n")
-	if !reflect.DeepEqual(b, want) || err != io.ErrUnexpectedEOF {
+	if !slices.Equal(b, want) || err != io.ErrUnexpectedEOF {
 		t.Fatalf("ReadDotBytes2: %q, %v", b, err)
 	}
 }
diff --git a/src/net/udpsock.go b/src/net/udpsock.go
index 4f8acb7f..56aabffa 100644
--- a/src/net/udpsock.go
+++ b/src/net/udpsock.go
@@ -27,7 +27,7 @@ type UDPAddr struct {
 	Zone string // IPv6 scoped addressing zone
 }
 
-// AddrPort returns the UDPAddr a as a netip.AddrPort.
+// AddrPort returns the [UDPAddr] a as a [netip.AddrPort].
 //
 // If a.Port does not fit in a uint16, it's silently truncated.
 //
@@ -82,7 +82,7 @@ func (a *UDPAddr) opAddr() Addr {
 // recommended, because it will return at most one of the host name's
 // IP addresses.
 //
-// See func Dial for a description of the network and address
+// See func [Dial] for a description of the network and address
 // parameters.
 func ResolveUDPAddr(network, address string) (*UDPAddr, error) {
 	switch network {
@@ -99,7 +99,7 @@ func ResolveUDPAddr(network, address string) (*UDPAddr, error) {
 	return addrs.forResolve(network, address).(*UDPAddr), nil
 }
 
-// UDPAddrFromAddrPort returns addr as a UDPAddr. If addr.IsValid() is false,
+// UDPAddrFromAddrPort returns addr as a [UDPAddr]. If addr.IsValid() is false,
 // then the returned UDPAddr will contain a nil IP field, indicating an
 // address family-agnostic unspecified address.
 func UDPAddrFromAddrPort(addr netip.AddrPort) *UDPAddr {
@@ -117,14 +117,14 @@ type addrPortUDPAddr struct {
 
 func (addrPortUDPAddr) Network() string { return "udp" }
 
-// UDPConn is the implementation of the Conn and PacketConn interfaces
+// UDPConn is the implementation of the [Conn] and [PacketConn] interfaces
 // for UDP network connections.
 type UDPConn struct {
 	conn
 }
 
 // SyscallConn returns a raw network connection.
-// This implements the syscall.Conn interface.
+// This implements the [syscall.Conn] interface.
 func (c *UDPConn) SyscallConn() (syscall.RawConn, error) {
 	if !c.ok() {
 		return nil, syscall.EINVAL
@@ -132,7 +132,7 @@ func (c *UDPConn) SyscallConn() (syscall.RawConn, error) {
 	return newRawConn(c.fd), nil
 }
 
-// ReadFromUDP acts like ReadFrom but returns a UDPAddr.
+// ReadFromUDP acts like [UDPConn.ReadFrom] but returns a UDPAddr.
 func (c *UDPConn) ReadFromUDP(b []byte) (n int, addr *UDPAddr, err error) {
 	// This function is designed to allow the caller to control the lifetime
 	// of the returned *UDPAddr and thereby prevent an allocation.
@@ -153,7 +153,7 @@ func (c *UDPConn) readFromUDP(b []byte, addr *UDPAddr) (int, *UDPAddr, error) {
 	return n, addr, err
 }
 
-// ReadFrom implements the PacketConn ReadFrom method.
+// ReadFrom implements the [PacketConn] ReadFrom method.
 func (c *UDPConn) ReadFrom(b []byte) (int, Addr, error) {
 	n, addr, err := c.readFromUDP(b, &UDPAddr{})
 	if addr == nil {
@@ -163,11 +163,11 @@ func (c *UDPConn) ReadFrom(b []byte) (int, Addr, error) {
 	return n, addr, err
 }
 
-// ReadFromUDPAddrPort acts like ReadFrom but returns a netip.AddrPort.
+// ReadFromUDPAddrPort acts like ReadFrom but returns a [netip.AddrPort].
 //
 // If c is bound to an unspecified address, the returned
 // netip.AddrPort's address might be an IPv4-mapped IPv6 address.
-// Use netip.Addr.Unmap to get the address without the IPv6 prefix.
+// Use [netip.Addr.Unmap] to get the address without the IPv6 prefix.
 func (c *UDPConn) ReadFromUDPAddrPort(b []byte) (n int, addr netip.AddrPort, err error) {
 	if !c.ok() {
 		return 0, netip.AddrPort{}, syscall.EINVAL
@@ -184,7 +184,7 @@ func (c *UDPConn) ReadFromUDPAddrPort(b []byte) (n int, addr netip.AddrPort, err
 // bytes copied into b, the number of bytes copied into oob, the flags
 // that were set on the message and the source address of the message.
 //
-// The packages golang.org/x/net/ipv4 and golang.org/x/net/ipv6 can be
+// The packages [golang.org/x/net/ipv4] and [golang.org/x/net/ipv6] can be
 // used to manipulate IP-level socket options in oob.
 func (c *UDPConn) ReadMsgUDP(b, oob []byte) (n, oobn, flags int, addr *UDPAddr, err error) {
 	var ap netip.AddrPort
@@ -195,7 +195,7 @@ func (c *UDPConn) ReadMsgUDP(b, oob []byte) (n, oobn, flags int, addr *UDPAddr,
 	return
 }
 
-// ReadMsgUDPAddrPort is like ReadMsgUDP but returns an netip.AddrPort instead of a UDPAddr.
+// ReadMsgUDPAddrPort is like [UDPConn.ReadMsgUDP] but returns an [netip.AddrPort] instead of a [UDPAddr].
 func (c *UDPConn) ReadMsgUDPAddrPort(b, oob []byte) (n, oobn, flags int, addr netip.AddrPort, err error) {
 	if !c.ok() {
 		return 0, 0, 0, netip.AddrPort{}, syscall.EINVAL
@@ -207,7 +207,7 @@ func (c *UDPConn) ReadMsgUDPAddrPort(b, oob []byte) (n, oobn, flags int, addr ne
 	return
 }
 
-// WriteToUDP acts like WriteTo but takes a UDPAddr.
+// WriteToUDP acts like [UDPConn.WriteTo] but takes a [UDPAddr].
 func (c *UDPConn) WriteToUDP(b []byte, addr *UDPAddr) (int, error) {
 	if !c.ok() {
 		return 0, syscall.EINVAL
@@ -219,7 +219,7 @@ func (c *UDPConn) WriteToUDP(b []byte, addr *UDPAddr) (int, error) {
 	return n, err
 }
 
-// WriteToUDPAddrPort acts like WriteTo but takes a netip.AddrPort.
+// WriteToUDPAddrPort acts like [UDPConn.WriteTo] but takes a [netip.AddrPort].
 func (c *UDPConn) WriteToUDPAddrPort(b []byte, addr netip.AddrPort) (int, error) {
 	if !c.ok() {
 		return 0, syscall.EINVAL
@@ -231,7 +231,7 @@ func (c *UDPConn) WriteToUDPAddrPort(b []byte, addr netip.AddrPort) (int, error)
 	return n, err
 }
 
-// WriteTo implements the PacketConn WriteTo method.
+// WriteTo implements the [PacketConn] WriteTo method.
 func (c *UDPConn) WriteTo(b []byte, addr Addr) (int, error) {
 	if !c.ok() {
 		return 0, syscall.EINVAL
@@ -253,7 +253,7 @@ func (c *UDPConn) WriteTo(b []byte, addr Addr) (int, error) {
 // data is copied from oob. It returns the number of payload and
 // out-of-band bytes written.
 //
-// The packages golang.org/x/net/ipv4 and golang.org/x/net/ipv6 can be
+// The packages [golang.org/x/net/ipv4] and [golang.org/x/net/ipv6] can be
 // used to manipulate IP-level socket options in oob.
 func (c *UDPConn) WriteMsgUDP(b, oob []byte, addr *UDPAddr) (n, oobn int, err error) {
 	if !c.ok() {
@@ -266,7 +266,7 @@ func (c *UDPConn) WriteMsgUDP(b, oob []byte, addr *UDPAddr) (n, oobn int, err er
 	return
 }
 
-// WriteMsgUDPAddrPort is like WriteMsgUDP but takes a netip.AddrPort instead of a UDPAddr.
+// WriteMsgUDPAddrPort is like [UDPConn.WriteMsgUDP] but takes a [netip.AddrPort] instead of a [UDPAddr].
 func (c *UDPConn) WriteMsgUDPAddrPort(b, oob []byte, addr netip.AddrPort) (n, oobn int, err error) {
 	if !c.ok() {
 		return 0, 0, syscall.EINVAL
@@ -280,9 +280,9 @@ func (c *UDPConn) WriteMsgUDPAddrPort(b, oob []byte, addr netip.AddrPort) (n, oo
 
 func newUDPConn(fd *netFD) *UDPConn { return &UDPConn{conn{fd}} }
 
-// DialUDP acts like Dial for UDP networks.
+// DialUDP acts like [Dial] for UDP networks.
 //
-// The network must be a UDP network name; see func Dial for details.
+// The network must be a UDP network name; see func [Dial] for details.
 //
 // If laddr is nil, a local address is automatically chosen.
 // If the IP field of raddr is nil or an unspecified IP address, the
@@ -304,9 +304,9 @@ func DialUDP(network string, laddr, raddr *UDPAddr) (*UDPConn, error) {
 	return c, nil
 }
 
-// ListenUDP acts like ListenPacket for UDP networks.
+// ListenUDP acts like [ListenPacket] for UDP networks.
 //
-// The network must be a UDP network name; see func Dial for details.
+// The network must be a UDP network name; see func [Dial] for details.
 //
 // If the IP field of laddr is nil or an unspecified IP address,
 // ListenUDP listens on all available IP addresses of the local system
@@ -330,10 +330,10 @@ func ListenUDP(network string, laddr *UDPAddr) (*UDPConn, error) {
 	return c, nil
 }
 
-// ListenMulticastUDP acts like ListenPacket for UDP networks but
+// ListenMulticastUDP acts like [ListenPacket] for UDP networks but
 // takes a group address on a specific network interface.
 //
-// The network must be a UDP network name; see func Dial for details.
+// The network must be a UDP network name; see func [Dial] for details.
 //
 // ListenMulticastUDP listens on all available IP addresses of the
 // local system including the group, multicast IP address.
@@ -345,8 +345,8 @@ func ListenUDP(network string, laddr *UDPAddr) (*UDPConn, error) {
 // chosen.
 //
 // ListenMulticastUDP is just for convenience of simple, small
-// applications. There are golang.org/x/net/ipv4 and
-// golang.org/x/net/ipv6 packages for general purpose uses.
+// applications. There are [golang.org/x/net/ipv4] and
+// [golang.org/x/net/ipv6] packages for general purpose uses.
 //
 // Note that ListenMulticastUDP will set the IP_MULTICAST_LOOP socket option
 // to 0 under IPPROTO_IP, to disable loopback of multicast packets.
diff --git a/src/net/udpsock_test.go b/src/net/udpsock_test.go
index 8a21aa73..6dacc81d 100644
--- a/src/net/udpsock_test.go
+++ b/src/net/udpsock_test.go
@@ -7,6 +7,7 @@ package net
 import (
 	"errors"
 	"fmt"
+	"internal/asan"
 	"internal/testenv"
 	"net/netip"
 	"os"
@@ -340,7 +341,7 @@ func TestUDPZeroBytePayload(t *testing.T) {
 	switch runtime.GOOS {
 	case "plan9":
 		t.Skipf("not supported on %s", runtime.GOOS)
-	case "darwin", "ios":
+	case "ios":
 		testenv.SkipFlaky(t, 29225)
 	}
 	if !testableNetwork("udp") {
@@ -493,6 +494,9 @@ func TestAllocs(t *testing.T) {
 	if !testableNetwork("udp4") {
 		t.Skipf("skipping: udp4 not available")
 	}
+	if asan.Enabled {
+		t.Skip("test allocates more with -asan; see #70079")
+	}
 
 	// Optimizations are required to remove the allocs.
 	testenv.SkipIfOptimizationOff(t)
diff --git a/src/net/url/example_test.go b/src/net/url/example_test.go
index a1913508..311ba5c3 100644
--- a/src/net/url/example_test.go
+++ b/src/net/url/example_test.go
@@ -253,6 +253,18 @@ func ExampleURL_IsAbs() {
 	// true
 }
 
+func ExampleURL_JoinPath() {
+	u, err := url.Parse("https://example.com/foo/bar")
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	fmt.Println(u.JoinPath("baz", "qux"))
+
+	// Output:
+	// https://example.com/foo/bar/baz/qux
+}
+
 func ExampleURL_MarshalBinary() {
 	u, _ := url.Parse("https://example.org")
 	b, err := u.MarshalBinary()
diff --git a/src/net/url/url.go b/src/net/url/url.go
index 7beaef1b..8a8de1c6 100644
--- a/src/net/url/url.go
+++ b/src/net/url/url.go
@@ -13,6 +13,7 @@ package url
 import (
 	"errors"
 	"fmt"
+	"maps"
 	"path"
 	"slices"
 	"strconv"
@@ -1004,12 +1005,7 @@ func (v Values) Encode() string {
 		return ""
 	}
 	var buf strings.Builder
-	keys := make([]string, 0, len(v))
-	for k := range v {
-		keys = append(keys, k)
-	}
-	slices.Sort(keys)
-	for _, k := range keys {
+	for _, k := range slices.Sorted(maps.Keys(v)) {
 		vs := v[k]
 		keyEscaped := QueryEscape(k)
 		for _, v := range vs {
@@ -1219,7 +1215,11 @@ func splitHostPort(hostPort string) (host, port string) {
 // Would like to implement MarshalText/UnmarshalText but that will change the JSON representation of URLs.
 
 func (u *URL) MarshalBinary() (text []byte, err error) {
-	return []byte(u.String()), nil
+	return u.AppendBinary(nil)
+}
+
+func (u *URL) AppendBinary(b []byte) ([]byte, error) {
+	return append(b, u.String()...), nil
 }
 
 func (u *URL) UnmarshalBinary(text []byte) error {
diff --git a/src/net/url/url_test.go b/src/net/url/url_test.go
index 68219c3d..16e08b63 100644
--- a/src/net/url/url_test.go
+++ b/src/net/url/url_test.go
@@ -1866,6 +1866,7 @@ func TestURLHostnameAndPort(t *testing.T) {
 
 var _ encodingPkg.BinaryMarshaler = (*URL)(nil)
 var _ encodingPkg.BinaryUnmarshaler = (*URL)(nil)
+var _ encodingPkg.BinaryAppender = (*URL)(nil)
 
 func TestJSON(t *testing.T) {
 	u, err := Parse("https://www.google.com/x?y=z")
diff --git a/src/os/copy_test.go b/src/os/copy_test.go
index 82346ca4..6fe7f6e5 100644
--- a/src/os/copy_test.go
+++ b/src/os/copy_test.go
@@ -7,6 +7,7 @@ package os_test
 import (
 	"bytes"
 	"errors"
+	"fmt"
 	"io"
 	"math/rand/v2"
 	"net"
@@ -70,28 +71,135 @@ func TestLargeCopyViaNetwork(t *testing.T) {
 	}
 }
 
+func TestCopyFileToFile(t *testing.T) {
+	const size = 1 * 1024 * 1024
+	dir := t.TempDir()
+
+	src, err := os.Create(dir + "/src")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer src.Close()
+	if _, err := io.CopyN(src, newRandReader(), size); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := src.Seek(0, 0); err != nil {
+		t.Fatal(err)
+	}
+
+	mustSeek := func(f *os.File, offset int64, whence int) int64 {
+		ret, err := f.Seek(offset, whence)
+		if err != nil {
+			t.Fatal(err)
+		}
+		return ret
+	}
+
+	for _, srcStart := range []int64{0, 100, size} {
+		remaining := size - srcStart
+		for _, dstStart := range []int64{0, 200} {
+			for _, limit := range []int64{remaining, remaining - 100, size * 2, 0} {
+				if limit < 0 {
+					continue
+				}
+				name := fmt.Sprintf("srcStart=%v/dstStart=%v/limit=%v", srcStart, dstStart, limit)
+				t.Run(name, func(t *testing.T) {
+					dst, err := os.CreateTemp(dir, "dst")
+					if err != nil {
+						t.Fatal(err)
+					}
+					defer dst.Close()
+					defer os.Remove(dst.Name())
+
+					mustSeek(src, srcStart, io.SeekStart)
+					if _, err := io.CopyN(dst, zeroReader{}, dstStart); err != nil {
+						t.Fatal(err)
+					}
+
+					var copied int64
+					if limit == 0 {
+						copied, err = io.Copy(dst, src)
+					} else {
+						copied, err = io.CopyN(dst, src, limit)
+					}
+					if limit > remaining {
+						if err != io.EOF {
+							t.Errorf("Copy: %v; want io.EOF", err)
+						}
+					} else {
+						if err != nil {
+							t.Errorf("Copy: %v; want nil", err)
+						}
+					}
+
+					wantCopied := remaining
+					if limit != 0 {
+						wantCopied = min(limit, wantCopied)
+					}
+					if copied != wantCopied {
+						t.Errorf("copied %v bytes, want %v", copied, wantCopied)
+					}
+
+					srcPos := mustSeek(src, 0, io.SeekCurrent)
+					wantSrcPos := srcStart + wantCopied
+					if srcPos != wantSrcPos {
+						t.Errorf("source position = %v, want %v", srcPos, wantSrcPos)
+					}
+
+					dstPos := mustSeek(dst, 0, io.SeekCurrent)
+					wantDstPos := dstStart + wantCopied
+					if dstPos != wantDstPos {
+						t.Errorf("destination position = %v, want %v", dstPos, wantDstPos)
+					}
+
+					mustSeek(dst, 0, io.SeekStart)
+					rr := newRandReader()
+					io.CopyN(io.Discard, rr, srcStart)
+					wantReader := io.MultiReader(
+						io.LimitReader(zeroReader{}, dstStart),
+						io.LimitReader(rr, wantCopied),
+					)
+					if err := compareReaders(dst, wantReader); err != nil {
+						t.Fatal(err)
+					}
+				})
+
+			}
+		}
+	}
+}
+
 func compareReaders(a, b io.Reader) error {
 	bufa := make([]byte, 4096)
 	bufb := make([]byte, 4096)
+	off := 0
 	for {
 		na, erra := io.ReadFull(a, bufa)
-		if erra != nil && erra != io.EOF {
+		if erra != nil && erra != io.EOF && erra != io.ErrUnexpectedEOF {
 			return erra
 		}
 		nb, errb := io.ReadFull(b, bufb)
-		if errb != nil && errb != io.EOF {
+		if errb != nil && errb != io.EOF && errb != io.ErrUnexpectedEOF {
 			return errb
 		}
 		if !bytes.Equal(bufa[:na], bufb[:nb]) {
 			return errors.New("contents mismatch")
 		}
-		if erra == io.EOF && errb == io.EOF {
+		if erra != nil && errb != nil {
 			break
 		}
+		off += len(bufa)
 	}
 	return nil
 }
 
+type zeroReader struct{}
+
+func (r zeroReader) Read(p []byte) (int, error) {
+	clear(p)
+	return len(p), nil
+}
+
 type randReader struct {
 	rand *rand.Rand
 }
@@ -101,16 +209,8 @@ func newRandReader() *randReader {
 }
 
 func (r *randReader) Read(p []byte) (int, error) {
-	var v uint64
-	var n int
 	for i := range p {
-		if n == 0 {
-			v = r.rand.Uint64()
-			n = 8
-		}
-		p[i] = byte(v & 0xff)
-		v >>= 8
-		n--
+		p[i] = byte(r.rand.Uint32() & 0xff)
 	}
 	return len(p), nil
 }
diff --git a/src/os/dir.go b/src/os/dir.go
index 04392193..939b208d 100644
--- a/src/os/dir.go
+++ b/src/os/dir.go
@@ -145,6 +145,9 @@ func ReadDir(name string) ([]DirEntry, error) {
 //
 // Symbolic links in dir are followed.
 //
+// New files added to fsys (including if dir is a subdirectory of fsys)
+// while CopyFS is running are not guaranteed to be copied.
+//
 // Copying stops at and returns the first error encountered.
 func CopyFS(dir string, fsys fs.FS) error {
 	return fs.WalkDir(fsys, ".", func(path string, d fs.DirEntry, err error) error {
diff --git a/src/os/dir_unix.go b/src/os/dir_unix.go
index d8b4faa0..eadc1660 100644
--- a/src/os/dir_unix.go
+++ b/src/os/dir_unix.go
@@ -175,11 +175,11 @@ func readIntBE(b []byte, size uintptr) uint64 {
 	case 1:
 		return uint64(b[0])
 	case 2:
-		return uint64(byteorder.BeUint16(b))
+		return uint64(byteorder.BEUint16(b))
 	case 4:
-		return uint64(byteorder.BeUint32(b))
+		return uint64(byteorder.BEUint32(b))
 	case 8:
-		return uint64(byteorder.BeUint64(b))
+		return uint64(byteorder.BEUint64(b))
 	default:
 		panic("syscall: readInt with unsupported size")
 	}
@@ -190,11 +190,11 @@ func readIntLE(b []byte, size uintptr) uint64 {
 	case 1:
 		return uint64(b[0])
 	case 2:
-		return uint64(byteorder.LeUint16(b))
+		return uint64(byteorder.LEUint16(b))
 	case 4:
-		return uint64(byteorder.LeUint32(b))
+		return uint64(byteorder.LEUint32(b))
 	case 8:
-		return uint64(byteorder.LeUint64(b))
+		return uint64(byteorder.LEUint64(b))
 	default:
 		panic("syscall: readInt with unsupported size")
 	}
diff --git a/src/os/eloop_netbsd.go b/src/os/eloop_netbsd.go
new file mode 100644
index 00000000..670c88a8
--- /dev/null
+++ b/src/os/eloop_netbsd.go
@@ -0,0 +1,19 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build netbsd
+
+package os
+
+import "syscall"
+
+// isNoFollowErr reports whether err may result from O_NOFOLLOW blocking an open operation.
+func isNoFollowErr(err error) bool {
+	// NetBSD returns EFTYPE, but check the other possibilities as well.
+	switch err {
+	case syscall.ELOOP, syscall.EMLINK, syscall.EFTYPE:
+		return true
+	}
+	return false
+}
diff --git a/src/os/eloop_other.go b/src/os/eloop_other.go
new file mode 100644
index 00000000..aace57bd
--- /dev/null
+++ b/src/os/eloop_other.go
@@ -0,0 +1,27 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build aix || darwin || dragonfly || freebsd || linux || openbsd || solaris || wasip1
+
+package os
+
+import (
+	"runtime"
+	"syscall"
+)
+
+// isNoFollowErr reports whether err may result from O_NOFOLLOW blocking an open operation.
+func isNoFollowErr(err error) bool {
+	switch err {
+	case syscall.ELOOP, syscall.EMLINK:
+		return true
+	}
+	if runtime.GOOS == "dragonfly" {
+		// Dragonfly appears to return EINVAL from openat in this case.
+		if err == syscall.EINVAL {
+			return true
+		}
+	}
+	return false
+}
diff --git a/src/os/env_test.go b/src/os/env_test.go
index 5809f4b8..e3de6419 100644
--- a/src/os/env_test.go
+++ b/src/os/env_test.go
@@ -6,7 +6,7 @@ package os_test
 
 import (
 	. "os"
-	"reflect"
+	"slices"
 	"strings"
 	"testing"
 )
@@ -91,7 +91,7 @@ func TestConsistentEnviron(t *testing.T) {
 	e0 := Environ()
 	for i := 0; i < 10; i++ {
 		e1 := Environ()
-		if !reflect.DeepEqual(e0, e1) {
+		if !slices.Equal(e0, e1) {
 			t.Fatalf("environment changed")
 		}
 	}
diff --git a/src/os/error_errno.go b/src/os/error_errno.go
index c8140461..66225833 100644
--- a/src/os/error_errno.go
+++ b/src/os/error_errno.go
@@ -9,3 +9,9 @@ package os
 import "syscall"
 
 type syscallErrorType = syscall.Errno
+
+const (
+	errENOSYS = syscall.ENOSYS
+	errERANGE = syscall.ERANGE
+	errENOMEM = syscall.ENOMEM
+)
diff --git a/src/os/error_plan9.go b/src/os/error_plan9.go
index af6065db..35026554 100644
--- a/src/os/error_plan9.go
+++ b/src/os/error_plan9.go
@@ -7,3 +7,7 @@ package os
 import "syscall"
 
 type syscallErrorType = syscall.ErrorString
+
+var errENOSYS = syscall.NewError("function not implemented")
+var errERANGE = syscall.NewError("out of range")
+var errENOMEM = syscall.NewError("cannot allocate memory")
diff --git a/src/os/exec/dot_test.go b/src/os/exec/dot_test.go
index ed4bad23..1bf0d9c7 100644
--- a/src/os/exec/dot_test.go
+++ b/src/os/exec/dot_test.go
@@ -38,8 +38,7 @@ func TestLookPath(t *testing.T) {
 	if err := os.WriteFile(filepath.Join(tmpDir, executable), []byte{1, 2, 3}, 0777); err != nil {
 		t.Fatal(err)
 	}
-	chdir(t, tmpDir)
-	t.Setenv("PWD", tmpDir)
+	t.Chdir(tmpDir)
 	t.Logf(". is %#q", tmpDir)
 
 	origPath := os.Getenv(pathVar)
diff --git a/src/os/exec/env_test.go b/src/os/exec/env_test.go
index ea06af38..9fd022b2 100644
--- a/src/os/exec/env_test.go
+++ b/src/os/exec/env_test.go
@@ -5,7 +5,7 @@
 package exec
 
 import (
-	"reflect"
+	"slices"
 	"testing"
 )
 
@@ -60,7 +60,7 @@ func TestDedupEnv(t *testing.T) {
 	}
 	for _, tt := range tests {
 		got, err := dedupEnvCase(tt.noCase, tt.nulOK, tt.in)
-		if !reflect.DeepEqual(got, tt.want) || (err != nil) != tt.wantErr {
+		if !slices.Equal(got, tt.want) || (err != nil) != tt.wantErr {
 			t.Errorf("Dedup(%v, %q) = %q, %v; want %q, error:%v", tt.noCase, tt.in, got, err, tt.want, tt.wantErr)
 		}
 	}
diff --git a/src/os/exec/exec.go b/src/os/exec/exec.go
index da9f68fe..fecfc97d 100644
--- a/src/os/exec/exec.go
+++ b/src/os/exec/exec.go
@@ -166,11 +166,27 @@ type Cmd struct {
 	// value in the slice for each duplicate key is used.
 	// As a special case on Windows, SYSTEMROOT is always added if
 	// missing and not explicitly set to the empty string.
+	//
+	// See also the Dir field, which may set PWD in the environment.
 	Env []string
 
 	// Dir specifies the working directory of the command.
 	// If Dir is the empty string, Run runs the command in the
 	// calling process's current directory.
+	//
+	// On Unix systems, the value of Dir also determines the
+	// child process's PWD environment variable if not otherwise
+	// specified. A Unix process represents its working directory
+	// not by name but as an implicit reference to a node in the
+	// file tree. So, if the child process obtains its working
+	// directory by calling a function such as C's getcwd, which
+	// computes the canonical name by walking up the file tree, it
+	// will not recover the original value of Dir if that value
+	// was an alias involving symbolic links. However, if the
+	// child process calls Go's [os.Getwd] or GNU C's
+	// get_current_dir_name, and the value of PWD is an alias for
+	// the current directory, those functions will return the
+	// value of PWD, which matches the value of Dir.
 	Dir string
 
 	// Stdin specifies the process's standard input.
@@ -984,7 +1000,9 @@ func (c *Cmd) awaitGoroutines(timer *time.Timer) error {
 
 // Output runs the command and returns its standard output.
 // Any returned error will usually be of type [*ExitError].
-// If c.Stderr was nil, Output populates [ExitError.Stderr].
+// If c.Stderr was nil and the returned error is of type
+// [*ExitError], Output populates the Stderr field of the
+// returned error.
 func (c *Cmd) Output() ([]byte, error) {
 	if c.Stdout != nil {
 		return nil, errors.New("exec: Stdout already set")
diff --git a/src/os/exec/exec_posix_test.go b/src/os/exec/exec_posix_test.go
index 5d828b34..45604203 100644
--- a/src/os/exec/exec_posix_test.go
+++ b/src/os/exec/exec_posix_test.go
@@ -13,8 +13,8 @@ import (
 	"os"
 	"os/user"
 	"path/filepath"
-	"reflect"
 	"runtime"
+	"slices"
 	"strconv"
 	"strings"
 	"syscall"
@@ -184,7 +184,7 @@ func TestImplicitPWD(t *testing.T) {
 					wantPWDs = nil
 				}
 			}
-			if !reflect.DeepEqual(pwds, wantPWDs) {
+			if !slices.Equal(pwds, wantPWDs) {
 				t.Errorf("PWD entries in cmd.Environ():\n\t%s\nwant:\n\t%s", strings.Join(pwds, "\n\t"), strings.Join(wantPWDs, "\n\t"))
 			}
 
@@ -257,7 +257,7 @@ func TestExplicitPWD(t *testing.T) {
 			}
 
 			wantPWDs := []string{tc.pwd}
-			if !reflect.DeepEqual(pwds, wantPWDs) {
+			if !slices.Equal(pwds, wantPWDs) {
 				t.Errorf("PWD entries in cmd.Environ():\n\t%s\nwant:\n\t%s", strings.Join(pwds, "\n\t"), strings.Join(wantPWDs, "\n\t"))
 			}
 
diff --git a/src/os/exec/exec_test.go b/src/os/exec/exec_test.go
index a0bb89e2..8c623871 100644
--- a/src/os/exec/exec_test.go
+++ b/src/os/exec/exec_test.go
@@ -159,64 +159,16 @@ func helperCommandContext(t *testing.T, ctx context.Context, name string, args .
 	helperCommandUsed.LoadOrStore(name, true)
 
 	t.Helper()
-	testenv.MustHaveExec(t)
-
+	exe := testenv.Executable(t)
 	cs := append([]string{name}, args...)
 	if ctx != nil {
-		cmd = exec.CommandContext(ctx, exePath(t), cs...)
+		cmd = exec.CommandContext(ctx, exe, cs...)
 	} else {
-		cmd = exec.Command(exePath(t), cs...)
+		cmd = exec.Command(exe, cs...)
 	}
 	return cmd
 }
 
-// exePath returns the path to the running executable.
-func exePath(t testing.TB) string {
-	exeOnce.Do(func() {
-		// Use os.Executable instead of os.Args[0] in case the caller modifies
-		// cmd.Dir: if the test binary is invoked like "./exec.test", it should
-		// not fail spuriously.
-		exeOnce.path, exeOnce.err = os.Executable()
-	})
-
-	if exeOnce.err != nil {
-		if t == nil {
-			panic(exeOnce.err)
-		}
-		t.Fatal(exeOnce.err)
-	}
-
-	return exeOnce.path
-}
-
-var exeOnce struct {
-	path string
-	err  error
-	sync.Once
-}
-
-func chdir(t *testing.T, dir string) {
-	t.Helper()
-
-	prev, err := os.Getwd()
-	if err != nil {
-		t.Fatal(err)
-	}
-	if err := os.Chdir(dir); err != nil {
-		t.Fatal(err)
-	}
-	t.Logf("Chdir(%#q)", dir)
-
-	t.Cleanup(func() {
-		if err := os.Chdir(prev); err != nil {
-			// Couldn't chdir back to the original working directory.
-			// panic instead of t.Fatal so that we don't run other tests
-			// in an unexpected location.
-			panic("couldn't restore working directory: " + err.Error())
-		}
-	})
-}
-
 var helperCommandUsed sync.Map
 
 var helperCommands = map[string]func(...string){
@@ -1201,7 +1153,7 @@ func cmdHang(args ...string) {
 	pid := os.Getpid()
 
 	if *subsleep != 0 {
-		cmd := exec.Command(exePath(nil), "hang", subsleep.String(), "-read=true", "-probe="+probe.String())
+		cmd := exec.Command(testenv.Executable(nil), "hang", subsleep.String(), "-read=true", "-probe="+probe.String())
 		cmd.Stdin = os.Stdin
 		cmd.Stderr = os.Stderr
 		out, err := cmd.StdoutPipe()
diff --git a/src/os/exec/lp_unix_test.go b/src/os/exec/lp_unix_test.go
index 1503ddae..ea7ec11c 100644
--- a/src/os/exec/lp_unix_test.go
+++ b/src/os/exec/lp_unix_test.go
@@ -16,7 +16,7 @@ func TestLookPathUnixEmptyPath(t *testing.T) {
 	// Not parallel: uses Chdir and Setenv.
 
 	tmp := t.TempDir()
-	chdir(t, tmp)
+	t.Chdir(tmp)
 
 	f, err := os.OpenFile("exec_me", os.O_CREATE|os.O_EXCL, 0700)
 	if err != nil {
diff --git a/src/os/exec/lp_windows.go b/src/os/exec/lp_windows.go
index 0e058d41..12256743 100644
--- a/src/os/exec/lp_windows.go
+++ b/src/os/exec/lp_windows.go
@@ -10,7 +10,6 @@ import (
 	"os"
 	"path/filepath"
 	"strings"
-	"syscall"
 )
 
 // ErrNotFound is the error resulting if a path search failed to find an executable file.
@@ -154,7 +153,7 @@ func lookPath(file string, exts []string) (string, error) {
 		dotf   string
 		dotErr error
 	)
-	if _, found := syscall.Getenv("NoDefaultCurrentDirectoryInExePath"); !found {
+	if _, found := os.LookupEnv("NoDefaultCurrentDirectoryInExePath"); !found {
 		if f, err := findExecutable(filepath.Join(".", file), exts); err == nil {
 			if execerrdot.Value() == "0" {
 				execerrdot.IncNonDefault()
diff --git a/src/os/exec/lp_windows_test.go b/src/os/exec/lp_windows_test.go
index a92a2979..01eda04c 100644
--- a/src/os/exec/lp_windows_test.go
+++ b/src/os/exec/lp_windows_test.go
@@ -25,13 +25,8 @@ func init() {
 	registerHelperCommand("printpath", cmdPrintPath)
 }
 
-func cmdPrintPath(args ...string) {
-	exe, err := os.Executable()
-	if err != nil {
-		fmt.Fprintf(os.Stderr, "Executable: %v\n", err)
-		os.Exit(1)
-	}
-	fmt.Println(exe)
+func cmdPrintPath(_ ...string) {
+	fmt.Println(testenv.Executable(nil))
 }
 
 // makePATH returns a PATH variable referring to the
@@ -82,7 +77,7 @@ func installProgs(t *testing.T, root string, files []string) {
 // (We use a copy instead of just a symlink to ensure that os.Executable
 // always reports an unambiguous path, regardless of how it is implemented.)
 func installExe(t *testing.T, dstPath string) {
-	src, err := os.Open(exePath(t))
+	src, err := os.Open(testenv.Executable(t))
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -319,7 +314,7 @@ func TestLookPathWindows(t *testing.T) {
 			t.Setenv("PATH", pathVar)
 			t.Logf("set PATH=%s", pathVar)
 
-			chdir(t, root)
+			t.Chdir(root)
 
 			if !testing.Short() && !(tt.skipCmdExeCheck || errors.Is(tt.wantErr, exec.ErrDot)) {
 				// Check that cmd.exe, which is our source of ground truth,
@@ -554,7 +549,7 @@ func TestCommand(t *testing.T) {
 			t.Setenv("PATH", pathVar)
 			t.Logf("set PATH=%s", pathVar)
 
-			chdir(t, root)
+			t.Chdir(root)
 
 			cmd := exec.Command(tt.arg0, "printpath")
 			cmd.Dir = filepath.Join(root, tt.dir)
diff --git a/src/os/exec_unix.go b/src/os/exec_unix.go
index ba6146ad..34467ac7 100644
--- a/src/os/exec_unix.go
+++ b/src/os/exec_unix.go
@@ -63,17 +63,12 @@ func (p *Process) pidWait() (*ProcessState, error) {
 	var (
 		status syscall.WaitStatus
 		rusage syscall.Rusage
-		pid1   int
-		e      error
 	)
-	for {
-		pid1, e = syscall.Wait4(p.Pid, &status, 0, &rusage)
-		if e != syscall.EINTR {
-			break
-		}
-	}
-	if e != nil {
-		return nil, NewSyscallError("wait", e)
+	pid1, err := ignoringEINTR2(func() (int, error) {
+		return syscall.Wait4(p.Pid, &status, 0, &rusage)
+	})
+	if err != nil {
+		return nil, NewSyscallError("wait", err)
 	}
 	p.pidDeactivate(statusDone)
 	return &ProcessState{
diff --git a/src/os/exec_windows.go b/src/os/exec_windows.go
index a2d7d343..f5e3a4ff 100644
--- a/src/os/exec_windows.go
+++ b/src/os/exec_windows.go
@@ -54,7 +54,7 @@ func (p *Process) wait() (ps *ProcessState, err error) {
 	if !isWin10AndAbove {
 		defer time.Sleep(5 * time.Millisecond)
 	}
-	
+
 	defer p.Release()
 	return &ProcessState{p.Pid, syscall.WaitStatus{ExitCode: ec}, &u}, nil
 }
diff --git a/src/os/executable_dragonfly.go b/src/os/executable_dragonfly.go
index 19c2ae89..939c6f6e 100644
--- a/src/os/executable_dragonfly.go
+++ b/src/os/executable_dragonfly.go
@@ -10,3 +10,5 @@ const (
 	_KERN_PROC          = 14
 	_KERN_PROC_PATHNAME = 9
 )
+
+var executableMIB = [4]int32{_CTL_KERN, _KERN_PROC, _KERN_PROC_PATHNAME, -1}
diff --git a/src/os/executable_freebsd.go b/src/os/executable_freebsd.go
index 95f1a93c..da40fcb3 100644
--- a/src/os/executable_freebsd.go
+++ b/src/os/executable_freebsd.go
@@ -10,3 +10,5 @@ const (
 	_KERN_PROC          = 14
 	_KERN_PROC_PATHNAME = 12
 )
+
+var executableMIB = [4]int32{_CTL_KERN, _KERN_PROC, _KERN_PROC_PATHNAME, -1}
diff --git a/src/os/executable_netbsd.go b/src/os/executable_netbsd.go
new file mode 100644
index 00000000..fd075390
--- /dev/null
+++ b/src/os/executable_netbsd.go
@@ -0,0 +1,14 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package os
+
+// From NetBSD's 
+const (
+	_CTL_KERN           = 1
+	_KERN_PROC_ARGS     = 48
+	_KERN_PROC_PATHNAME = 5
+)
+
+var executableMIB = [4]int32{_CTL_KERN, _KERN_PROC_ARGS, -1, _KERN_PROC_PATHNAME}
diff --git a/src/os/executable_procfs.go b/src/os/executable_procfs.go
index 6a2cd10b..a52631c0 100644
--- a/src/os/executable_procfs.go
+++ b/src/os/executable_procfs.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build linux || netbsd
+//go:build linux
 
 package os
 
@@ -19,8 +19,6 @@ func executable() (string, error) {
 		return "", errors.New("Executable not implemented for " + runtime.GOOS)
 	case "linux", "android":
 		procfn = "/proc/self/exe"
-	case "netbsd":
-		procfn = "/proc/curproc/exe"
 	}
 	path, err := Readlink(procfn)
 
diff --git a/src/os/executable_sysctl.go b/src/os/executable_sysctl.go
index 3c2aeacf..8b52e92c 100644
--- a/src/os/executable_sysctl.go
+++ b/src/os/executable_sysctl.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build freebsd || dragonfly
+//go:build freebsd || dragonfly || netbsd
 
 package os
 
@@ -12,11 +12,9 @@ import (
 )
 
 func executable() (string, error) {
-	mib := [4]int32{_CTL_KERN, _KERN_PROC, _KERN_PROC_PATHNAME, -1}
-
 	n := uintptr(0)
 	// get length
-	_, _, err := syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Pointer(&mib[0])), 4, 0, uintptr(unsafe.Pointer(&n)), 0, 0)
+	_, _, err := syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Pointer(&executableMIB[0])), 4, 0, uintptr(unsafe.Pointer(&n)), 0, 0)
 	if err != 0 {
 		return "", err
 	}
@@ -24,7 +22,7 @@ func executable() (string, error) {
 		return "", nil
 	}
 	buf := make([]byte, n)
-	_, _, err = syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Pointer(&mib[0])), 4, uintptr(unsafe.Pointer(&buf[0])), uintptr(unsafe.Pointer(&n)), 0, 0)
+	_, _, err = syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Pointer(&executableMIB[0])), 4, uintptr(unsafe.Pointer(&buf[0])), uintptr(unsafe.Pointer(&n)), 0, 0)
 	if err != 0 {
 		return "", err
 	}
diff --git a/src/os/executable_test.go b/src/os/executable_test.go
index 98b72d7d..1770843c 100644
--- a/src/os/executable_test.go
+++ b/src/os/executable_test.go
@@ -13,16 +13,30 @@ import (
 	"testing"
 )
 
-const executable_EnvVar = "OSTEST_OUTPUT_EXECPATH"
-
 func TestExecutable(t *testing.T) {
-	testenv.MustHaveExec(t)
-	t.Parallel()
+	const helperEnvVar = "OSTEST_OUTPUT_EXECPATH"
 
-	ep, err := os.Executable()
-	if err != nil {
-		t.Fatalf("Executable failed: %v", err)
+	if os.Getenv(helperEnvVar) != "" {
+		// First chdir to another path.
+		dir := "/"
+		if runtime.GOOS == "windows" {
+			cwd, err := os.Getwd()
+			if err != nil {
+				panic(err)
+			}
+			dir = filepath.VolumeName(cwd)
+		}
+		os.Chdir(dir)
+		if ep, err := os.Executable(); err != nil {
+			fmt.Fprint(os.Stderr, "ERROR: ", err)
+		} else {
+			fmt.Fprint(os.Stderr, ep)
+		}
+		os.Exit(0)
 	}
+
+	t.Parallel()
+	ep := testenv.Executable(t)
 	// we want fn to be of the form "dir/prog"
 	dir := filepath.Dir(filepath.Dir(ep))
 	fn, err := filepath.Rel(dir, ep)
@@ -30,7 +44,7 @@ func TestExecutable(t *testing.T) {
 		t.Fatalf("filepath.Rel: %v", err)
 	}
 
-	cmd := testenv.Command(t, fn, "-test.run=^$")
+	cmd := testenv.Command(t, fn, "-test.run=^"+t.Name()+"$")
 	// make child start with a relative program path
 	cmd.Dir = dir
 	cmd.Path = fn
@@ -41,7 +55,7 @@ func TestExecutable(t *testing.T) {
 		// get real path of the executable without influenced by argv[0].
 		cmd.Args[0] = "-"
 	}
-	cmd.Env = append(cmd.Environ(), fmt.Sprintf("%s=1", executable_EnvVar))
+	cmd.Env = append(cmd.Environ(), fmt.Sprintf("%s=1", helperEnvVar))
 	out, err := cmd.CombinedOutput()
 	if err != nil {
 		t.Fatalf("exec(self) failed: %v", err)
@@ -67,27 +81,6 @@ func sameFile(fn1, fn2 string) bool {
 	return os.SameFile(fi1, fi2)
 }
 
-func init() {
-	if e := os.Getenv(executable_EnvVar); e != "" {
-		// first chdir to another path
-		dir := "/"
-		if runtime.GOOS == "windows" {
-			cwd, err := os.Getwd()
-			if err != nil {
-				panic(err)
-			}
-			dir = filepath.VolumeName(cwd)
-		}
-		os.Chdir(dir)
-		if ep, err := os.Executable(); err != nil {
-			fmt.Fprint(os.Stderr, "ERROR: ", err)
-		} else {
-			fmt.Fprint(os.Stderr, ep)
-		}
-		os.Exit(0)
-	}
-}
-
 func TestExecutableDeleted(t *testing.T) {
 	testenv.MustHaveGoBuild(t)
 	switch runtime.GOOS {
diff --git a/src/os/export_freebsd_test.go b/src/os/export_freebsd_test.go
new file mode 100644
index 00000000..56bfcc6c
--- /dev/null
+++ b/src/os/export_freebsd_test.go
@@ -0,0 +1,9 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package os
+
+var (
+	PollCopyFileRangeP = &pollCopyFileRange
+)
diff --git a/src/os/fifo_test.go b/src/os/fifo_test.go
index 3b7e5eac..111dd2aa 100644
--- a/src/os/fifo_test.go
+++ b/src/os/fifo_test.go
@@ -161,10 +161,7 @@ func TestNonPollable(t *testing.T) {
 
 // Issue 60211.
 func TestOpenFileNonBlocking(t *testing.T) {
-	exe, err := os.Executable()
-	if err != nil {
-		t.Skipf("can't find executable: %v", err)
-	}
+	exe := testenv.Executable(t)
 	f, err := os.OpenFile(exe, os.O_RDONLY|syscall.O_NONBLOCK, 0666)
 	if err != nil {
 		t.Fatal(err)
diff --git a/src/os/file.go b/src/os/file.go
index ad869fc4..a5063680 100644
--- a/src/os/file.go
+++ b/src/os/file.go
@@ -344,8 +344,13 @@ func Chdir(dir string) error {
 		return &PathError{Op: "chdir", Path: dir, Err: e}
 	}
 	if runtime.GOOS == "windows" {
+		abs := filepathlite.IsAbs(dir)
 		getwdCache.Lock()
-		getwdCache.dir = dir
+		if abs {
+			getwdCache.dir = dir
+		} else {
+			getwdCache.dir = ""
+		}
 		getwdCache.Unlock()
 	}
 	if log := testlog.Logger(); log != nil {
@@ -369,6 +374,7 @@ func Open(name string) (*File, error) {
 // it is truncated. If the file does not exist, it is created with mode 0o666
 // (before umask). If successful, methods on the returned File can
 // be used for I/O; the associated file descriptor has mode O_RDWR.
+// The directory containing the file must already exist.
 // If there is an error, it will be of type *PathError.
 func Create(name string) (*File, error) {
 	return OpenFile(name, O_RDWR|O_CREATE|O_TRUNC, 0666)
@@ -377,7 +383,8 @@ func Create(name string) (*File, error) {
 // OpenFile is the generalized open call; most users will use Open
 // or Create instead. It opens the named file with specified flag
 // (O_RDONLY etc.). If the file does not exist, and the O_CREATE flag
-// is passed, it is created with mode perm (before umask). If successful,
+// is passed, it is created with mode perm (before umask);
+// the containing directory must exist. If successful,
 // methods on the returned File can be used for I/O.
 // If there is an error, it will be of type *PathError.
 func OpenFile(name string, flag int, perm FileMode) (*File, error) {
@@ -391,6 +398,8 @@ func OpenFile(name string, flag int, perm FileMode) (*File, error) {
 	return f, nil
 }
 
+var errPathEscapes = errors.New("path escapes from parent")
+
 // openDir opens a file which is assumed to be a directory. As such, it skips
 // the syscalls that make the file descriptor non-blocking as these take time
 // and will fail on file descriptors for directories.
@@ -404,6 +413,7 @@ var lstat = Lstat
 
 // Rename renames (moves) oldpath to newpath.
 // If newpath already exists and is not a directory, Rename replaces it.
+// If newpath already exists and is a directory, Rename returns an error.
 // OS-specific restrictions may apply when oldpath and newpath are in different directories.
 // Even within the same directory, on non-Unix platforms Rename is not an atomic operation.
 // If there is an error, it will be of type *LinkError.
@@ -472,8 +482,8 @@ func TempDir() string {
 // On Windows, it returns %LocalAppData%.
 // On Plan 9, it returns $home/lib/cache.
 //
-// If the location cannot be determined (for example, $HOME is not defined),
-// then it will return an error.
+// If the location cannot be determined (for example, $HOME is not defined) or
+// the path in $XDG_CACHE_HOME is relative, then it will return an error.
 func UserCacheDir() (string, error) {
 	var dir string
 
@@ -506,6 +516,8 @@ func UserCacheDir() (string, error) {
 				return "", errors.New("neither $XDG_CACHE_HOME nor $HOME are defined")
 			}
 			dir += "/.cache"
+		} else if !filepathlite.IsAbs(dir) {
+			return "", errors.New("path in $XDG_CACHE_HOME is relative")
 		}
 	}
 
@@ -523,8 +535,8 @@ func UserCacheDir() (string, error) {
 // On Windows, it returns %AppData%.
 // On Plan 9, it returns $home/lib.
 //
-// If the location cannot be determined (for example, $HOME is not defined),
-// then it will return an error.
+// If the location cannot be determined (for example, $HOME is not defined) or
+// the path in $XDG_CONFIG_HOME is relative, then it will return an error.
 func UserConfigDir() (string, error) {
 	var dir string
 
@@ -557,6 +569,8 @@ func UserConfigDir() (string, error) {
 				return "", errors.New("neither $XDG_CONFIG_HOME nor $HOME are defined")
 			}
 			dir += "/.config"
+		} else if !filepathlite.IsAbs(dir) {
+			return "", errors.New("path in $XDG_CONFIG_HOME is relative")
 		}
 	}
 
@@ -682,6 +696,8 @@ func (f *File) SyscallConn() (syscall.RawConn, error) {
 // a general substitute for a chroot-style security mechanism when the directory tree
 // contains arbitrary content.
 //
+// Use [Root.FS] to obtain a fs.FS that prevents escapes from the tree via symbolic links.
+//
 // The directory dir must not be "".
 //
 // The result implements [io/fs.StatFS], [io/fs.ReadFileFS] and
@@ -786,7 +802,10 @@ func ReadFile(name string) ([]byte, error) {
 		return nil, err
 	}
 	defer f.Close()
+	return readFileContents(f)
+}
 
+func readFileContents(f *File) ([]byte, error) {
 	var size int
 	if info, err := f.Stat(); err == nil {
 		size64 := info.Size()
diff --git a/src/os/file_plan9.go b/src/os/file_plan9.go
index ef277dec..c123fe69 100644
--- a/src/os/file_plan9.go
+++ b/src/os/file_plan9.go
@@ -617,3 +617,7 @@ func newRawConn(file *File) (*rawConn, error) {
 func ignoringEINTR(fn func() error) error {
 	return fn()
 }
+
+func ignoringEINTR2[T any](fn func() (T, error)) (T, error) {
+	return fn()
+}
diff --git a/src/os/file_posix.go b/src/os/file_posix.go
index 8ff0ada4..f0cdfdae 100644
--- a/src/os/file_posix.go
+++ b/src/os/file_posix.go
@@ -254,3 +254,13 @@ func ignoringEINTR(fn func() error) error {
 		}
 	}
 }
+
+// ignoringEINTR2 is ignoringEINTR, but returning an additional value.
+func ignoringEINTR2[T any](fn func() (T, error)) (T, error) {
+	for {
+		v, err := fn()
+		if err != syscall.EINTR {
+			return v, err
+		}
+	}
+}
diff --git a/src/os/file_unix.go b/src/os/file_unix.go
index 37bfaa1a..b5c0baf3 100644
--- a/src/os/file_unix.go
+++ b/src/os/file_unix.go
@@ -306,7 +306,7 @@ func openDirNolog(name string) (*File, error) {
 		e error
 	)
 	ignoringEINTR(func() error {
-		r, s, e = open(name, O_RDONLY|syscall.O_CLOEXEC, 0)
+		r, s, e = open(name, O_RDONLY|syscall.O_CLOEXEC|syscall.O_DIRECTORY, 0)
 		return e
 	})
 	if e != nil {
@@ -446,22 +446,15 @@ func Symlink(oldname, newname string) error {
 func readlink(name string) (string, error) {
 	for len := 128; ; len *= 2 {
 		b := make([]byte, len)
-		var (
-			n int
-			e error
-		)
-		for {
-			n, e = fixCount(syscall.Readlink(name, b))
-			if e != syscall.EINTR {
-				break
-			}
-		}
+		n, err := ignoringEINTR2(func() (int, error) {
+			return fixCount(syscall.Readlink(name, b))
+		})
 		// buffer too small
-		if (runtime.GOOS == "aix" || runtime.GOOS == "wasip1") && e == syscall.ERANGE {
+		if (runtime.GOOS == "aix" || runtime.GOOS == "wasip1") && err == syscall.ERANGE {
 			continue
 		}
-		if e != nil {
-			return "", &PathError{Op: "readlink", Path: name, Err: e}
+		if err != nil {
+			return "", &PathError{Op: "readlink", Path: name, Err: err}
 		}
 		if n < len {
 			return string(b[0:n]), nil
diff --git a/src/os/file_windows.go b/src/os/file_windows.go
index cf652ca1..2160f1e6 100644
--- a/src/os/file_windows.go
+++ b/src/os/file_windows.go
@@ -103,20 +103,9 @@ func openFileNolog(name string, flag int, perm FileMode) (*File, error) {
 		return nil, &PathError{Op: "open", Path: name, Err: syscall.ENOENT}
 	}
 	path := fixLongPath(name)
-	r, e := syscall.Open(path, flag|syscall.O_CLOEXEC, syscallMode(perm))
-	if e != nil {
-		// We should return EISDIR when we are trying to open a directory with write access.
-		if e == syscall.ERROR_ACCESS_DENIED && (flag&O_WRONLY != 0 || flag&O_RDWR != 0) {
-			pathp, e1 := syscall.UTF16PtrFromString(path)
-			if e1 == nil {
-				var fa syscall.Win32FileAttributeData
-				e1 = syscall.GetFileAttributesEx(pathp, syscall.GetFileExInfoStandard, (*byte)(unsafe.Pointer(&fa)))
-				if e1 == nil && fa.FileAttributes&syscall.FILE_ATTRIBUTE_DIRECTORY != 0 {
-					e = syscall.EISDIR
-				}
-			}
-		}
-		return nil, &PathError{Op: "open", Path: name, Err: e}
+	r, err := syscall.Open(path, flag|syscall.O_CLOEXEC, syscallMode(perm))
+	if err != nil {
+		return nil, &PathError{Op: "open", Path: name, Err: err}
 	}
 	return newFile(r, name, "file"), nil
 }
@@ -234,17 +223,13 @@ func Pipe() (r *File, w *File, err error) {
 	return newFile(p[0], "|0", "pipe"), newFile(p[1], "|1", "pipe"), nil
 }
 
-var (
-	useGetTempPath2Once sync.Once
-	useGetTempPath2     bool
-)
+var useGetTempPath2 = sync.OnceValue(func() bool {
+	return windows.ErrorLoadingGetTempPath2() == nil
+})
 
 func tempDir() string {
-	useGetTempPath2Once.Do(func() {
-		useGetTempPath2 = (windows.ErrorLoadingGetTempPath2() == nil)
-	})
 	getTempPath := syscall.GetTempPath
-	if useGetTempPath2 {
+	if useGetTempPath2() {
 		getTempPath = windows.GetTempPath2
 	}
 	n := uint32(syscall.MAX_PATH)
@@ -430,10 +415,13 @@ func readReparseLink(path string) (string, error) {
 		return "", err
 	}
 	defer syscall.CloseHandle(h)
+	return readReparseLinkHandle(h)
+}
 
+func readReparseLinkHandle(h syscall.Handle) (string, error) {
 	rdbbuf := make([]byte, syscall.MAXIMUM_REPARSE_DATA_BUFFER_SIZE)
 	var bytesReturned uint32
-	err = syscall.DeviceIoControl(h, syscall.FSCTL_GET_REPARSE_POINT, nil, 0, &rdbbuf[0], uint32(len(rdbbuf)), &bytesReturned, nil)
+	err := syscall.DeviceIoControl(h, syscall.FSCTL_GET_REPARSE_POINT, nil, 0, &rdbbuf[0], uint32(len(rdbbuf)), &bytesReturned, nil)
 	if err != nil {
 		return "", err
 	}
diff --git a/src/os/getwd.go b/src/os/getwd.go
index 90604cf2..5ce948fa 100644
--- a/src/os/getwd.go
+++ b/src/os/getwd.go
@@ -15,45 +15,61 @@ var getwdCache struct {
 	dir string
 }
 
-// Getwd returns a rooted path name corresponding to the
+// Getwd returns an absolute path name corresponding to the
 // current directory. If the current directory can be
 // reached via multiple paths (due to symbolic links),
 // Getwd may return any one of them.
+//
+// On Unix platforms, if the environment variable PWD
+// provides an absolute name, and it is a name of the
+// current directory, it is returned.
 func Getwd() (dir string, err error) {
 	if runtime.GOOS == "windows" || runtime.GOOS == "plan9" {
-		return syscall.Getwd()
+		// Use syscall.Getwd directly for
+		//   - plan9: see reasons in CL 89575;
+		//   - windows: syscall implementation is sufficient,
+		//     and we should not rely on $PWD.
+		dir, err = syscall.Getwd()
+		return dir, NewSyscallError("getwd", err)
 	}
 
 	// Clumsy but widespread kludge:
 	// if $PWD is set and matches ".", use it.
-	dot, err := statNolog(".")
-	if err != nil {
-		return "", err
-	}
+	var dot FileInfo
 	dir = Getenv("PWD")
 	if len(dir) > 0 && dir[0] == '/' {
+		dot, err = statNolog(".")
+		if err != nil {
+			return "", err
+		}
 		d, err := statNolog(dir)
 		if err == nil && SameFile(dot, d) {
 			return dir, nil
 		}
+		// If err is ENAMETOOLONG here, the syscall.Getwd below will
+		// fail with the same error, too, but let's give it a try
+		// anyway as the fallback code is much slower.
 	}
 
 	// If the operating system provides a Getwd call, use it.
-	// Otherwise, we're trying to find our way back to ".".
 	if syscall.ImplementsGetwd {
-		var (
-			s string
-			e error
-		)
-		for {
-			s, e = syscall.Getwd()
-			if e != syscall.EINTR {
-				break
-			}
+		dir, err = ignoringEINTR2(syscall.Getwd)
+		// Linux returns ENAMETOOLONG if the result is too long.
+		// Some BSD systems appear to return EINVAL.
+		// FreeBSD systems appear to use ENOMEM
+		// Solaris appears to use ERANGE.
+		if err != syscall.ENAMETOOLONG && err != syscall.EINVAL && err != errERANGE && err != errENOMEM {
+			return dir, NewSyscallError("getwd", err)
 		}
-		return s, NewSyscallError("getwd", e)
 	}
 
+	// We're trying to find our way back to ".".
+	if dot == nil {
+		dot, err = statNolog(".")
+		if err != nil {
+			return "", err
+		}
+	}
 	// Apply same kludge but to cached dir instead of $PWD.
 	getwdCache.Lock()
 	dir = getwdCache.dir
@@ -82,9 +98,9 @@ func Getwd() (dir string, err error) {
 	dir = ""
 	for parent := ".."; ; parent = "../" + parent {
 		if len(parent) >= 1024 { // Sanity check
-			return "", syscall.ENAMETOOLONG
+			return "", NewSyscallError("getwd", syscall.ENAMETOOLONG)
 		}
-		fd, err := openFileNolog(parent, O_RDONLY, 0)
+		fd, err := openDirNolog(parent)
 		if err != nil {
 			return "", err
 		}
@@ -93,7 +109,14 @@ func Getwd() (dir string, err error) {
 			names, err := fd.Readdirnames(100)
 			if err != nil {
 				fd.Close()
-				return "", err
+				// Readdirnames can return io.EOF or other error.
+				// In any case, we're here because syscall.Getwd
+				// is not implemented or failed with ENAMETOOLONG,
+				// so return the most sensible error.
+				if syscall.ImplementsGetwd {
+					return "", NewSyscallError("getwd", syscall.ENAMETOOLONG)
+				}
+				return "", NewSyscallError("getwd", errENOSYS)
 			}
 			for _, name := range names {
 				d, _ := lstatNolog(parent + "/" + name)
diff --git a/src/os/getwd_unix_test.go b/src/os/getwd_unix_test.go
new file mode 100644
index 00000000..3f3067b5
--- /dev/null
+++ b/src/os/getwd_unix_test.go
@@ -0,0 +1,113 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build unix
+
+package os_test
+
+import (
+	"errors"
+	. "os"
+	"path/filepath"
+	"runtime"
+	"strings"
+	"syscall"
+	"testing"
+)
+
+func TestGetwdDeep(t *testing.T) {
+	testGetwdDeep(t, false)
+}
+
+func TestGetwdDeepWithPWDSet(t *testing.T) {
+	testGetwdDeep(t, true)
+}
+
+// testGetwdDeep checks that os.Getwd is able to return paths
+// longer than syscall.PathMax (with or without PWD set).
+func testGetwdDeep(t *testing.T, setPWD bool) {
+	tempDir := t.TempDir()
+
+	dir := tempDir
+	t.Chdir(dir)
+
+	if setPWD {
+		t.Setenv("PWD", dir)
+	} else {
+		// When testing os.Getwd, setting PWD to empty string
+		// is the same as unsetting it, but the latter would
+		// be more complicated since we don't have t.Unsetenv.
+		t.Setenv("PWD", "")
+	}
+
+	name := strings.Repeat("a", 200)
+	for {
+		if err := Mkdir(name, 0o700); err != nil {
+			t.Fatal(err)
+		}
+		if err := Chdir(name); err != nil {
+			t.Fatal(err)
+		}
+		if setPWD {
+			dir += "/" + name
+			if err := Setenv("PWD", dir); err != nil {
+				t.Fatal(err)
+			}
+			t.Logf(" $PWD len: %d", len(dir))
+		}
+
+		wd, err := Getwd()
+		t.Logf("Getwd len: %d", len(wd))
+		if err != nil {
+			// We can get an EACCES error if we can't read up
+			// to root, which happens on the Android builders.
+			if errors.Is(err, syscall.EACCES) {
+				t.Logf("ignoring EACCES error: %v", err)
+				break
+			}
+			t.Fatal(err)
+		}
+		if setPWD && wd != dir {
+			// It's possible for the stat of PWD to fail
+			// with ENAMETOOLONG, and for getwd to fail for
+			// the same reason, and it's possible for $TMPDIR
+			// to contain a symlink. In that case the fallback
+			// code will not return the same directory.
+			if len(dir) > 1000 {
+				symDir, err := filepath.EvalSymlinks(tempDir)
+				if err == nil && symDir != tempDir {
+					t.Logf("EvalSymlinks(%q) = %q", tempDir, symDir)
+					if strings.Replace(dir, tempDir, symDir, 1) == wd {
+						// Symlink confusion is OK.
+						break
+					}
+				}
+			}
+
+			t.Fatalf("Getwd: got %q, want same value as $PWD: %q", wd, dir)
+		}
+		// Ideally the success criterion should be len(wd) > syscall.PathMax,
+		// but the latter is not public for some platforms, so use Stat(wd).
+		// When it fails with ENAMETOOLONG, it means:
+		//  - wd is longer than PathMax;
+		//  - Getwd have used the slow fallback code.
+		//
+		// To avoid an endless loop here in case Stat keeps working,
+		// check if len(wd) is above the largest known PathMax among
+		// all Unix platforms (4096, on Linux).
+		if _, err := Stat(wd); err != nil || len(wd) > 4096 {
+			t.Logf("Done; len(wd)=%d", len(wd))
+			// Most systems return ENAMETOOLONG.
+			// Dragonfly returns EFAULT.
+			switch {
+			case err == nil:
+			case errors.Is(err, syscall.ENAMETOOLONG):
+			case runtime.GOOS == "dragonfly" && errors.Is(err, syscall.EFAULT):
+			default:
+				t.Fatalf("unexpected Stat error: %v", err)
+			}
+			break
+		}
+	}
+}
diff --git a/src/os/os_test.go b/src/os/os_test.go
index f1755dfa..1e2db94d 100644
--- a/src/os/os_test.go
+++ b/src/os/os_test.go
@@ -16,7 +16,6 @@ import (
 	. "os"
 	"os/exec"
 	"path/filepath"
-	"reflect"
 	"runtime"
 	"runtime/debug"
 	"slices"
@@ -196,7 +195,7 @@ func TestStat(t *testing.T) {
 }
 
 func TestStatError(t *testing.T) {
-	defer chtmpdir(t)()
+	t.Chdir(t.TempDir())
 
 	path := "no-such-file"
 
@@ -233,8 +232,7 @@ func TestStatError(t *testing.T) {
 
 func TestStatSymlinkLoop(t *testing.T) {
 	testenv.MustHaveSymlink(t)
-
-	defer chtmpdir(t)()
+	t.Chdir(t.TempDir())
 
 	err := Symlink("x", "y")
 	if err != nil {
@@ -805,13 +803,13 @@ func TestReaddirStatFailures(t *testing.T) {
 	}
 
 	if got, want := names(mustReadDir("initial readdir")),
-		[]string{"good1", "good2", "x"}; !reflect.DeepEqual(got, want) {
+		[]string{"good1", "good2", "x"}; !slices.Equal(got, want) {
 		t.Errorf("initial readdir got %q; want %q", got, want)
 	}
 
 	xerr = ErrNotExist
 	if got, want := names(mustReadDir("with x disappearing")),
-		[]string{"good1", "good2"}; !reflect.DeepEqual(got, want) {
+		[]string{"good1", "good2"}; !slices.Equal(got, want) {
 		t.Errorf("with x disappearing, got %q; want %q", got, want)
 	}
 
@@ -852,8 +850,8 @@ func TestReaddirOfFile(t *testing.T) {
 
 func TestHardLink(t *testing.T) {
 	testenv.MustHaveLink(t)
+	t.Chdir(t.TempDir())
 
-	defer chtmpdir(t)()
 	from, to := "hardlinktestfrom", "hardlinktestto"
 	file, err := Create(to)
 	if err != nil {
@@ -908,32 +906,10 @@ func TestHardLink(t *testing.T) {
 	}
 }
 
-// chtmpdir changes the working directory to a new temporary directory and
-// provides a cleanup function.
-func chtmpdir(t *testing.T) func() {
-	oldwd, err := Getwd()
-	if err != nil {
-		t.Fatalf("chtmpdir: %v", err)
-	}
-	d, err := MkdirTemp("", "test")
-	if err != nil {
-		t.Fatalf("chtmpdir: %v", err)
-	}
-	if err := Chdir(d); err != nil {
-		t.Fatalf("chtmpdir: %v", err)
-	}
-	return func() {
-		if err := Chdir(oldwd); err != nil {
-			t.Fatalf("chtmpdir: %v", err)
-		}
-		RemoveAll(d)
-	}
-}
-
 func TestSymlink(t *testing.T) {
 	testenv.MustHaveSymlink(t)
+	t.Chdir(t.TempDir())
 
-	defer chtmpdir(t)()
 	from, to := "symlinktestfrom", "symlinktestto"
 	file, err := Create(to)
 	if err != nil {
@@ -993,8 +969,8 @@ func TestSymlink(t *testing.T) {
 
 func TestLongSymlink(t *testing.T) {
 	testenv.MustHaveSymlink(t)
+	t.Chdir(t.TempDir())
 
-	defer chtmpdir(t)()
 	s := "0123456789abcdef"
 	// Long, but not too long: a common limit is 255.
 	s = s + s + s + s + s + s + s + s + s + s + s + s + s + s + s
@@ -1013,7 +989,7 @@ func TestLongSymlink(t *testing.T) {
 }
 
 func TestRename(t *testing.T) {
-	defer chtmpdir(t)()
+	t.Chdir(t.TempDir())
 	from, to := "renamefrom", "renameto"
 
 	file, err := Create(from)
@@ -1034,7 +1010,7 @@ func TestRename(t *testing.T) {
 }
 
 func TestRenameOverwriteDest(t *testing.T) {
-	defer chtmpdir(t)()
+	t.Chdir(t.TempDir())
 	from, to := "renamefrom", "renameto"
 
 	toData := []byte("to")
@@ -1071,7 +1047,7 @@ func TestRenameOverwriteDest(t *testing.T) {
 }
 
 func TestRenameFailed(t *testing.T) {
-	defer chtmpdir(t)()
+	t.Chdir(t.TempDir())
 	from, to := "renamefrom", "renameto"
 
 	err := Rename(from, to)
@@ -1094,7 +1070,7 @@ func TestRenameFailed(t *testing.T) {
 }
 
 func TestRenameNotExisting(t *testing.T) {
-	defer chtmpdir(t)()
+	t.Chdir(t.TempDir())
 	from, to := "doesnt-exist", "dest"
 
 	Mkdir(to, 0777)
@@ -1105,7 +1081,7 @@ func TestRenameNotExisting(t *testing.T) {
 }
 
 func TestRenameToDirFailed(t *testing.T) {
-	defer chtmpdir(t)()
+	t.Chdir(t.TempDir())
 	from, to := "renamefrom", "renameto"
 
 	Mkdir(from, 0777)
@@ -1150,7 +1126,7 @@ func TestRenameCaseDifference(pt *testing.T) {
 
 	for _, test := range tests {
 		pt.Run(test.name, func(t *testing.T) {
-			defer chtmpdir(t)()
+			t.Chdir(t.TempDir())
 
 			if err := test.create(); err != nil {
 				t.Fatalf("failed to create test file: %s", err)
@@ -1530,10 +1506,10 @@ func testChtimes(t *testing.T, name string) {
 				t.Log(errormsg)
 				t.Log("Known NetBSD issue (atime not changed on fs mounted with noatime); ignoring.")
 			} else {
-				t.Errorf(errormsg)
+				t.Error(errormsg)
 			}
 		default:
-			t.Errorf(errormsg)
+			t.Error(errormsg)
 		}
 	}
 
@@ -1572,7 +1548,7 @@ func TestFileChdir(t *testing.T) {
 	if err != nil {
 		t.Fatalf("Getwd: %s", err)
 	}
-	defer Chdir(wd)
+	t.Chdir(".") // Ensure wd is restored after the test.
 
 	fd, err := Open(".")
 	if err != nil {
@@ -1607,10 +1583,8 @@ func TestFileChdir(t *testing.T) {
 }
 
 func TestChdirAndGetwd(t *testing.T) {
-	fd, err := Open(".")
-	if err != nil {
-		t.Fatalf("Open .: %s", err)
-	}
+	t.Chdir(t.TempDir()) // Ensure wd is restored after the test.
+
 	// These are chosen carefully not to be symlinks on a Mac
 	// (unlike, say, /var, /etc), except /tmp, which we handle below.
 	dirs := []string{"/", "/usr/bin", "/tmp"}
@@ -1624,16 +1598,16 @@ func TestChdirAndGetwd(t *testing.T) {
 		dirs = nil
 		for _, dir := range []string{t.TempDir(), t.TempDir()} {
 			// Expand symlinks so path equality tests work.
-			dir, err = filepath.EvalSymlinks(dir)
+			dir, err := filepath.EvalSymlinks(dir)
 			if err != nil {
 				t.Fatalf("EvalSymlinks: %v", err)
 			}
 			dirs = append(dirs, dir)
 		}
 	}
-	oldwd := Getenv("PWD")
 	for mode := 0; mode < 2; mode++ {
 		for _, d := range dirs {
+			var err error
 			if mode == 0 {
 				err = Chdir(d)
 			} else {
@@ -1649,30 +1623,17 @@ func TestChdirAndGetwd(t *testing.T) {
 				Setenv("PWD", "/tmp")
 			}
 			pwd, err1 := Getwd()
-			Setenv("PWD", oldwd)
-			err2 := fd.Chdir()
-			if err2 != nil {
-				// We changed the current directory and cannot go back.
-				// Don't let the tests continue; they'll scribble
-				// all over some other directory.
-				fmt.Fprintf(Stderr, "fchdir back to dot failed: %s\n", err2)
-				Exit(1)
-			}
 			if err != nil {
-				fd.Close()
 				t.Fatalf("Chdir %s: %s", d, err)
 			}
 			if err1 != nil {
-				fd.Close()
 				t.Fatalf("Getwd in %s: %s", d, err1)
 			}
 			if !equal(pwd, d) {
-				fd.Close()
 				t.Fatalf("Getwd returned %q want %q", pwd, d)
 			}
 		}
 	}
-	fd.Close()
 }
 
 // Test that Chdir+Getwd is program-wide.
@@ -1683,17 +1644,7 @@ func TestProgWideChdir(t *testing.T) {
 	done := make(chan struct{})
 
 	d := t.TempDir()
-	oldwd, err := Getwd()
-	if err != nil {
-		t.Fatalf("Getwd: %v", err)
-	}
-	defer func() {
-		if err := Chdir(oldwd); err != nil {
-			// It's not safe to continue with tests if we can't get back to
-			// the original working directory.
-			panic(err)
-		}
-	}()
+	t.Chdir(d)
 
 	// Note the deferred Wait must be called after the deferred close(done),
 	// to ensure the N goroutines have been released even if the main goroutine
@@ -1748,6 +1699,7 @@ func TestProgWideChdir(t *testing.T) {
 			}
 		}(i)
 	}
+	var err error
 	if err = Chdir(d); err != nil {
 		t.Fatalf("Chdir: %v", err)
 	}
@@ -1793,13 +1745,6 @@ func TestSeek(t *testing.T) {
 	for i, tt := range tests {
 		off, err := f.Seek(tt.in, tt.whence)
 		if off != tt.out || err != nil {
-			if e, ok := err.(*PathError); ok && e.Err == syscall.EINVAL && tt.out > 1<<32 && runtime.GOOS == "linux" {
-				mounts, _ := ReadFile("/proc/mounts")
-				if strings.Contains(string(mounts), "reiserfs") {
-					// Reiserfs rejects the big seeks.
-					t.Skipf("skipping test known to fail on reiserfs; https://golang.org/issue/91")
-				}
-			}
 			t.Errorf("#%d: Seek(%v, %v) = %v, %v want %v, nil", i, tt.in, tt.whence, off, err, tt.out)
 		}
 	}
@@ -1832,43 +1777,62 @@ func TestSeekError(t *testing.T) {
 	}
 }
 
-type openErrorTest struct {
-	path  string
-	mode  int
-	error error
-}
-
-var openErrorTests = []openErrorTest{
-	{
-		sfdir + "/no-such-file",
-		O_RDONLY,
-		syscall.ENOENT,
-	},
-	{
-		sfdir,
-		O_WRONLY,
-		syscall.EISDIR,
-	},
-	{
-		sfdir + "/" + sfname + "/no-such-file",
-		O_WRONLY,
-		syscall.ENOTDIR,
-	},
-}
-
 func TestOpenError(t *testing.T) {
 	t.Parallel()
-
-	for _, tt := range openErrorTests {
-		f, err := OpenFile(tt.path, tt.mode, 0)
+	dir := makefs(t, []string{
+		"is-a-file",
+		"is-a-dir/",
+	})
+	t.Run("NoRoot", func(t *testing.T) { testOpenError(t, dir, false) })
+	t.Run("InRoot", func(t *testing.T) { testOpenError(t, dir, true) })
+}
+func testOpenError(t *testing.T, dir string, rooted bool) {
+	t.Parallel()
+	var r *Root
+	if rooted {
+		var err error
+		r, err = OpenRoot(dir)
+		if err != nil {
+			t.Fatal(err)
+		}
+		defer r.Close()
+	}
+	for _, tt := range []struct {
+		path  string
+		mode  int
+		error error
+	}{{
+		"no-such-file",
+		O_RDONLY,
+		syscall.ENOENT,
+	}, {
+		"is-a-dir",
+		O_WRONLY,
+		syscall.EISDIR,
+	}, {
+		"is-a-file/no-such-file",
+		O_WRONLY,
+		syscall.ENOTDIR,
+	}} {
+		var f *File
+		var err error
+		var name string
+		if rooted {
+			name = fmt.Sprintf("Root(%q).OpenFile(%q, %d)", dir, tt.path, tt.mode)
+			f, err = r.OpenFile(tt.path, tt.mode, 0)
+		} else {
+			path := filepath.Join(dir, tt.path)
+			name = fmt.Sprintf("OpenFile(%q, %d)", path, tt.mode)
+			f, err = OpenFile(path, tt.mode, 0)
+		}
 		if err == nil {
-			t.Errorf("Open(%q, %d) succeeded", tt.path, tt.mode)
+			t.Errorf("%v succeeded", name)
 			f.Close()
 			continue
 		}
 		perr, ok := err.(*PathError)
 		if !ok {
-			t.Errorf("Open(%q, %d) returns error of %T type; want *PathError", tt.path, tt.mode, err)
+			t.Errorf("%v returns error of %T type; want *PathError", name, err)
 		}
 		if perr.Err != tt.error {
 			if runtime.GOOS == "plan9" {
@@ -1876,12 +1840,14 @@ func TestOpenError(t *testing.T) {
 				expectedErrStr := strings.Replace(tt.error.Error(), "file ", "", 1)
 				if !strings.HasSuffix(syscallErrStr, expectedErrStr) {
 					// Some Plan 9 file servers incorrectly return
-					// EACCES rather than EISDIR when a directory is
+					// EPERM or EACCES rather than EISDIR when a directory is
 					// opened for write.
-					if tt.error == syscall.EISDIR && strings.HasSuffix(syscallErrStr, syscall.EACCES.Error()) {
+					if tt.error == syscall.EISDIR &&
+						(strings.HasSuffix(syscallErrStr, syscall.EPERM.Error()) ||
+							strings.HasSuffix(syscallErrStr, syscall.EACCES.Error())) {
 						continue
 					}
-					t.Errorf("Open(%q, %d) = _, %q; want suffix %q", tt.path, tt.mode, syscallErrStr, expectedErrStr)
+					t.Errorf("%v = _, %q; want suffix %q", name, syscallErrStr, expectedErrStr)
 				}
 				continue
 			}
@@ -1892,7 +1858,7 @@ func TestOpenError(t *testing.T) {
 					continue
 				}
 			}
-			t.Errorf("Open(%q, %d) = _, %q; want %q", tt.path, tt.mode, perr.Err.Error(), tt.error.Error())
+			t.Errorf("%v = _, %q; want %q", name, perr.Err.Error(), tt.error.Error())
 		}
 	}
 }
@@ -2111,7 +2077,7 @@ func TestWriteAtNegativeOffset(t *testing.T) {
 
 // Verify that WriteAt doesn't work in append mode.
 func TestWriteAtInAppendMode(t *testing.T) {
-	defer chtmpdir(t)()
+	t.Chdir(t.TempDir())
 	f, err := OpenFile("write_at_in_append_mode.txt", O_APPEND|O_CREATE, 0666)
 	if err != nil {
 		t.Fatalf("OpenFile: %v", err)
@@ -2124,8 +2090,15 @@ func TestWriteAtInAppendMode(t *testing.T) {
 	}
 }
 
-func writeFile(t *testing.T, fname string, flag int, text string) string {
-	f, err := OpenFile(fname, flag, 0666)
+func writeFile(t *testing.T, r *Root, fname string, flag int, text string) string {
+	t.Helper()
+	var f *File
+	var err error
+	if r == nil {
+		f, err = OpenFile(fname, flag, 0666)
+	} else {
+		f, err = r.OpenFile(fname, flag, 0666)
+	}
 	if err != nil {
 		t.Fatalf("Open: %v", err)
 	}
@@ -2142,35 +2115,180 @@ func writeFile(t *testing.T, fname string, flag int, text string) string {
 }
 
 func TestAppend(t *testing.T) {
-	defer chtmpdir(t)()
-	const f = "append.txt"
-	s := writeFile(t, f, O_CREATE|O_TRUNC|O_RDWR, "new")
-	if s != "new" {
-		t.Fatalf("writeFile: have %q want %q", s, "new")
+	testMaybeRooted(t, func(t *testing.T, r *Root) {
+		const f = "append.txt"
+		s := writeFile(t, r, f, O_CREATE|O_TRUNC|O_RDWR, "new")
+		if s != "new" {
+			t.Fatalf("writeFile: have %q want %q", s, "new")
+		}
+		s = writeFile(t, r, f, O_APPEND|O_RDWR, "|append")
+		if s != "new|append" {
+			t.Fatalf("writeFile: have %q want %q", s, "new|append")
+		}
+		s = writeFile(t, r, f, O_CREATE|O_APPEND|O_RDWR, "|append")
+		if s != "new|append|append" {
+			t.Fatalf("writeFile: have %q want %q", s, "new|append|append")
+		}
+		err := Remove(f)
+		if err != nil {
+			t.Fatalf("Remove: %v", err)
+		}
+		s = writeFile(t, r, f, O_CREATE|O_APPEND|O_RDWR, "new&append")
+		if s != "new&append" {
+			t.Fatalf("writeFile: after append have %q want %q", s, "new&append")
+		}
+		s = writeFile(t, r, f, O_CREATE|O_RDWR, "old")
+		if s != "old&append" {
+			t.Fatalf("writeFile: after create have %q want %q", s, "old&append")
+		}
+		s = writeFile(t, r, f, O_CREATE|O_TRUNC|O_RDWR, "new")
+		if s != "new" {
+			t.Fatalf("writeFile: after truncate have %q want %q", s, "new")
+		}
+	})
+}
+
+// TestFilePermissions tests setting Unix permission bits on file creation.
+func TestFilePermissions(t *testing.T) {
+	if Getuid() == 0 {
+		t.Skip("skipping test when running as root")
 	}
-	s = writeFile(t, f, O_APPEND|O_RDWR, "|append")
-	if s != "new|append" {
-		t.Fatalf("writeFile: have %q want %q", s, "new|append")
+	for _, test := range []struct {
+		name string
+		mode FileMode
+	}{
+		{"r", 0o444},
+		{"w", 0o222},
+		{"rw", 0o666},
+	} {
+		t.Run(test.name, func(t *testing.T) {
+			switch runtime.GOOS {
+			case "windows":
+				if test.mode&0444 == 0 {
+					t.Skip("write-only files not supported on " + runtime.GOOS)
+				}
+			case "wasip1":
+				t.Skip("file permissions not supported on " + runtime.GOOS)
+			}
+			testMaybeRooted(t, func(t *testing.T, r *Root) {
+				const filename = "f"
+				var f *File
+				var err error
+				if r == nil {
+					f, err = OpenFile(filename, O_RDWR|O_CREATE|O_EXCL, test.mode)
+				} else {
+					f, err = r.OpenFile(filename, O_RDWR|O_CREATE|O_EXCL, test.mode)
+				}
+				if err != nil {
+					t.Fatal(err)
+				}
+				f.Close()
+				b, err := ReadFile(filename)
+				if test.mode&0o444 != 0 {
+					if err != nil {
+						t.Errorf("ReadFile = %v; want success", err)
+					}
+				} else {
+					if err == nil {
+						t.Errorf("ReadFile = %q, ; want failure", string(b))
+					}
+				}
+				_, err = Stat(filename)
+				if err != nil {
+					t.Errorf("Stat = %v; want success", err)
+				}
+				err = WriteFile(filename, nil, 0666)
+				if test.mode&0o222 != 0 {
+					if err != nil {
+						t.Errorf("WriteFile = %v; want success", err)
+						b, err := ReadFile(filename)
+						t.Errorf("ReadFile: %v", err)
+						t.Errorf("file contents: %q", b)
+					}
+				} else {
+					if err == nil {
+						t.Errorf("WriteFile(%q) = ; want failure", filename)
+						st, err := Stat(filename)
+						if err == nil {
+							t.Errorf("mode: %s", st.Mode())
+						}
+						b, err := ReadFile(filename)
+						t.Errorf("ReadFile: %v", err)
+						t.Errorf("file contents: %q", b)
+					}
+				}
+			})
+		})
 	}
-	s = writeFile(t, f, O_CREATE|O_APPEND|O_RDWR, "|append")
-	if s != "new|append|append" {
-		t.Fatalf("writeFile: have %q want %q", s, "new|append|append")
-	}
-	err := Remove(f)
-	if err != nil {
-		t.Fatalf("Remove: %v", err)
-	}
-	s = writeFile(t, f, O_CREATE|O_APPEND|O_RDWR, "new&append")
-	if s != "new&append" {
-		t.Fatalf("writeFile: after append have %q want %q", s, "new&append")
-	}
-	s = writeFile(t, f, O_CREATE|O_RDWR, "old")
-	if s != "old&append" {
-		t.Fatalf("writeFile: after create have %q want %q", s, "old&append")
-	}
-	s = writeFile(t, f, O_CREATE|O_TRUNC|O_RDWR, "new")
-	if s != "new" {
-		t.Fatalf("writeFile: after truncate have %q want %q", s, "new")
+
+}
+
+// TestFileRDWRFlags tests the O_RDONLY, O_WRONLY, and O_RDWR flags.
+func TestFileRDWRFlags(t *testing.T) {
+	for _, test := range []struct {
+		name string
+		flag int
+	}{
+		{"O_RDONLY", O_RDONLY},
+		{"O_WRONLY", O_WRONLY},
+		{"O_RDWR", O_RDWR},
+	} {
+		t.Run(test.name, func(t *testing.T) {
+			testMaybeRooted(t, func(t *testing.T, r *Root) {
+				const filename = "f"
+				content := []byte("content")
+				if err := WriteFile(filename, content, 0666); err != nil {
+					t.Fatal(err)
+				}
+				var f *File
+				var err error
+				if r == nil {
+					f, err = OpenFile(filename, test.flag, 0)
+				} else {
+					f, err = r.OpenFile(filename, test.flag, 0)
+				}
+				if err != nil {
+					t.Fatal(err)
+				}
+				defer f.Close()
+				got, err := io.ReadAll(f)
+				if test.flag == O_WRONLY {
+					if err == nil {
+						t.Errorf("read file: %q, %v; want error", got, err)
+					}
+				} else {
+					if err != nil || !bytes.Equal(got, content) {
+						t.Errorf("read file: %q, %v; want %q, ", got, err, content)
+					}
+				}
+				if _, err := f.Seek(0, 0); err != nil {
+					t.Fatalf("f.Seek: %v", err)
+				}
+				newcontent := []byte("CONTENT")
+				_, err = f.Write(newcontent)
+				if test.flag == O_RDONLY {
+					if err == nil {
+						t.Errorf("write file: succeeded, want error")
+					}
+				} else {
+					if err != nil {
+						t.Errorf("write file: %v, want success", err)
+					}
+				}
+				f.Close()
+				got, err = ReadFile(filename)
+				if err != nil {
+					t.Fatal(err)
+				}
+				want := content
+				if test.flag != O_RDONLY {
+					want = newcontent
+				}
+				if !bytes.Equal(got, want) {
+					t.Fatalf("after write, file contains %q, want %q", got, want)
+				}
+			})
+		})
 	}
 }
 
@@ -2201,7 +2319,7 @@ func TestNilProcessStateString(t *testing.T) {
 }
 
 func TestSameFile(t *testing.T) {
-	defer chtmpdir(t)()
+	t.Chdir(t.TempDir())
 	fa, err := Create("a")
 	if err != nil {
 		t.Fatalf("Create(a): %v", err)
@@ -2344,13 +2462,8 @@ func TestStatStdin(t *testing.T) {
 		Exit(0)
 	}
 
-	exe, err := Executable()
-	if err != nil {
-		t.Skipf("can't find executable: %v", err)
-	}
-
-	testenv.MustHaveExec(t)
 	t.Parallel()
+	exe := testenv.Executable(t)
 
 	fi, err := Stdin.Stat()
 	if err != nil {
@@ -2516,11 +2629,10 @@ func TestLongPath(t *testing.T) {
 }
 
 func testKillProcess(t *testing.T, processKiller func(p *Process)) {
-	testenv.MustHaveExec(t)
 	t.Parallel()
 
 	// Re-exec the test binary to start a process that hangs until stdin is closed.
-	cmd := testenv.Command(t, Args[0])
+	cmd := testenv.Command(t, testenv.Executable(t))
 	cmd.Env = append(cmd.Environ(), "GO_OS_TEST_DRAIN_STDIN=1")
 	stdout, err := cmd.StdoutPipe()
 	if err != nil {
@@ -2569,10 +2681,9 @@ func TestGetppid(t *testing.T) {
 		Exit(0)
 	}
 
-	testenv.MustHaveExec(t)
 	t.Parallel()
 
-	cmd := testenv.Command(t, Args[0], "-test.run=^TestGetppid$")
+	cmd := testenv.Command(t, testenv.Executable(t), "-test.run=^TestGetppid$")
 	cmd.Env = append(Environ(), "GO_WANT_HELPER_PROCESS=1")
 
 	// verify that Getppid() from the forked process reports our process id
@@ -2665,10 +2776,7 @@ func TestRemoveAllRace(t *testing.T) {
 
 	n := runtime.GOMAXPROCS(16)
 	defer runtime.GOMAXPROCS(n)
-	root, err := MkdirTemp("", "issue")
-	if err != nil {
-		t.Fatal(err)
-	}
+	root := t.TempDir()
 	mkdirTree(t, root, 1, 6)
 	hold := make(chan struct{})
 	var wg sync.WaitGroup
@@ -2690,6 +2798,8 @@ func TestRemoveAllRace(t *testing.T) {
 // Test that reading from a pipe doesn't use up a thread.
 func TestPipeThreads(t *testing.T) {
 	switch runtime.GOOS {
+	case "aix":
+		t.Skip("skipping on aix; issue 70131")
 	case "illumos", "solaris":
 		t.Skip("skipping on Solaris and illumos; issue 19111")
 	case "windows":
@@ -2704,11 +2814,6 @@ func TestPipeThreads(t *testing.T) {
 
 	threads := 100
 
-	// OpenBSD has a low default for max number of files.
-	if runtime.GOOS == "openbsd" {
-		threads = 50
-	}
-
 	r := make([]*File, threads)
 	w := make([]*File, threads)
 	for i := 0; i < threads; i++ {
@@ -2813,6 +2918,33 @@ func TestUserCacheDir(t *testing.T) {
 	}
 }
 
+func TestUserCacheDirXDGConfigDirEnvVar(t *testing.T) {
+	switch runtime.GOOS {
+	case "windows", "darwin", "plan9":
+		t.Skip("$XDG_CACHE_HOME is effective only on Unix systems")
+	}
+
+	wd, err := Getwd()
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Setenv("XDG_CACHE_HOME", wd)
+
+	dir, err := UserCacheDir()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if dir != wd {
+		t.Fatalf("UserCacheDir returned %q; want the value of $XDG_CACHE_HOME %q", dir, wd)
+	}
+
+	t.Setenv("XDG_CACHE_HOME", "some-dir")
+	_, err = UserCacheDir()
+	if err == nil {
+		t.Fatal("UserCacheDir succeeded though $XDG_CACHE_HOME contains a relative path")
+	}
+}
+
 func TestUserConfigDir(t *testing.T) {
 	t.Parallel()
 
@@ -2837,6 +2969,33 @@ func TestUserConfigDir(t *testing.T) {
 	}
 }
 
+func TestUserConfigDirXDGConfigDirEnvVar(t *testing.T) {
+	switch runtime.GOOS {
+	case "windows", "darwin", "plan9":
+		t.Skip("$XDG_CONFIG_HOME is effective only on Unix systems")
+	}
+
+	wd, err := Getwd()
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Setenv("XDG_CONFIG_HOME", wd)
+
+	dir, err := UserConfigDir()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if dir != wd {
+		t.Fatalf("UserConfigDir returned %q; want the value of $XDG_CONFIG_HOME %q", dir, wd)
+	}
+
+	t.Setenv("XDG_CONFIG_HOME", "some-dir")
+	_, err = UserConfigDir()
+	if err == nil {
+		t.Fatal("UserConfigDir succeeded though $XDG_CONFIG_HOME contains a relative path")
+	}
+}
+
 func TestUserHomeDir(t *testing.T) {
 	t.Parallel()
 
@@ -2950,6 +3109,22 @@ func isDeadlineExceeded(err error) bool {
 
 // Test that opening a file does not change its permissions.  Issue 38225.
 func TestOpenFileKeepsPermissions(t *testing.T) {
+	t.Run("OpenFile", func(t *testing.T) {
+		testOpenFileKeepsPermissions(t, OpenFile)
+	})
+	t.Run("RootOpenFile", func(t *testing.T) {
+		testOpenFileKeepsPermissions(t, func(name string, flag int, perm FileMode) (*File, error) {
+			dir, file := filepath.Split(name)
+			r, err := OpenRoot(dir)
+			if err != nil {
+				return nil, err
+			}
+			defer r.Close()
+			return r.OpenFile(file, flag, perm)
+		})
+	})
+}
+func testOpenFileKeepsPermissions(t *testing.T, openf func(name string, flag int, perm FileMode) (*File, error)) {
 	t.Parallel()
 
 	dir := t.TempDir()
@@ -2961,7 +3136,7 @@ func TestOpenFileKeepsPermissions(t *testing.T) {
 	if err := f.Close(); err != nil {
 		t.Error(err)
 	}
-	f, err = OpenFile(name, O_WRONLY|O_CREATE|O_TRUNC, 0)
+	f, err = openf(name, O_WRONLY|O_CREATE|O_TRUNC, 0)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -3015,10 +3190,21 @@ func forceMFTUpdateOnWindows(t *testing.T, path string) {
 
 func TestDirFS(t *testing.T) {
 	t.Parallel()
+	testDirFS(t, DirFS("./testdata/dirfs"))
+}
 
+func TestRootDirFS(t *testing.T) {
+	t.Parallel()
+	r, err := OpenRoot("./testdata/dirfs")
+	if err != nil {
+		t.Fatal(err)
+	}
+	testDirFS(t, r.FS())
+}
+
+func testDirFS(t *testing.T, fsys fs.FS) {
 	forceMFTUpdateOnWindows(t, "./testdata/dirfs")
 
-	fsys := DirFS("./testdata/dirfs")
 	if err := fstest.TestFS(fsys, "a", "b", "dir/x"); err != nil {
 		t.Fatal(err)
 	}
@@ -3333,24 +3519,7 @@ func TestCopyFS(t *testing.T) {
 	if err := fstest.TestFS(tmpFsys, "a", "b", "dir/x"); err != nil {
 		t.Fatal("TestFS:", err)
 	}
-	if err := fs.WalkDir(fsys, ".", func(path string, d fs.DirEntry, err error) error {
-		if d.IsDir() {
-			return nil
-		}
-
-		data, err := fs.ReadFile(fsys, path)
-		if err != nil {
-			return err
-		}
-		newData, err := fs.ReadFile(tmpFsys, path)
-		if err != nil {
-			return err
-		}
-		if !bytes.Equal(data, newData) {
-			return errors.New("file " + path + " contents differ")
-		}
-		return nil
-	}); err != nil {
+	if err := verifyCopyFS(t, fsys, tmpFsys); err != nil {
 		t.Fatal("comparing two directories:", err)
 	}
 
@@ -3379,24 +3548,7 @@ func TestCopyFS(t *testing.T) {
 	if err := fstest.TestFS(tmpFsys, "william", "carl", "daVinci", "einstein", "dir/newton"); err != nil {
 		t.Fatal("TestFS:", err)
 	}
-	if err := fs.WalkDir(fsys, ".", func(path string, d fs.DirEntry, err error) error {
-		if d.IsDir() {
-			return nil
-		}
-
-		data, err := fs.ReadFile(fsys, path)
-		if err != nil {
-			return err
-		}
-		newData, err := fs.ReadFile(tmpFsys, path)
-		if err != nil {
-			return err
-		}
-		if !bytes.Equal(data, newData) {
-			return errors.New("file " + path + " contents differ")
-		}
-		return nil
-	}); err != nil {
+	if err := verifyCopyFS(t, fsys, tmpFsys); err != nil {
 		t.Fatal("comparing two directories:", err)
 	}
 
@@ -3409,15 +3561,109 @@ func TestCopyFS(t *testing.T) {
 	}
 }
 
+// verifyCopyFS checks the content and permission of each file inside copied FS to ensure
+// the copied files satisfy the convention stipulated in CopyFS.
+func verifyCopyFS(t *testing.T, originFS, copiedFS fs.FS) error {
+	testDir := filepath.Join(t.TempDir(), "test")
+	// umask doesn't apply to the wasip and windows and there is no general way to get masked perm,
+	// so create a dir and a file to compare the permission after umask if any
+	if err := Mkdir(testDir, ModePerm); err != nil {
+		return fmt.Errorf("mkdir %q failed: %v", testDir, err)
+	}
+	dirStat, err := Stat(testDir)
+	if err != nil {
+		return fmt.Errorf("stat dir %q failed: %v", testDir, err)
+	}
+	wantDirMode := dirStat.Mode()
+
+	f, err := Create(filepath.Join(testDir, "tmp"))
+	if err != nil {
+		return fmt.Errorf("open %q failed: %v", filepath.Join(testDir, "tmp"), err)
+	}
+	defer f.Close()
+	wantFileRWStat, err := f.Stat()
+	if err != nil {
+		return fmt.Errorf("stat file %q failed: %v", f.Name(), err)
+	}
+	wantFileRWMode := wantFileRWStat.Mode()
+
+	return fs.WalkDir(originFS, ".", func(path string, d fs.DirEntry, err error) error {
+		if d.IsDir() {
+			// the dir . is not the dir created by CopyFS so skip checking its permission
+			if d.Name() == "." {
+				return nil
+			}
+
+			dinfo, err := fs.Stat(copiedFS, path)
+			if err != nil {
+				return err
+			}
+
+			if dinfo.Mode() != wantDirMode {
+				return fmt.Errorf("dir %q mode is %v, want %v",
+					d.Name(), dinfo.Mode(), wantDirMode)
+			}
+			return nil
+		}
+
+		fInfo, err := originFS.Open(path)
+		if err != nil {
+			return err
+		}
+		defer fInfo.Close()
+		copiedInfo, err := copiedFS.Open(path)
+		if err != nil {
+			return err
+		}
+		defer copiedInfo.Close()
+
+		// verify the file contents are the same
+		data, err := io.ReadAll(fInfo)
+		if err != nil {
+			return err
+		}
+		newData, err := io.ReadAll(copiedInfo)
+		if err != nil {
+			return err
+		}
+		if !bytes.Equal(data, newData) {
+			return fmt.Errorf("file %q content is %s, want %s", path, newData, data)
+		}
+
+		fStat, err := fInfo.Stat()
+		if err != nil {
+			return err
+		}
+		copiedStat, err := copiedInfo.Stat()
+		if err != nil {
+			return err
+		}
+
+		// check whether the execute permission is inherited from original FS
+
+		if copiedStat.Mode()&0111&wantFileRWMode != fStat.Mode()&0111&wantFileRWMode {
+			return fmt.Errorf("file %q execute mode is %v, want %v",
+				path, copiedStat.Mode()&0111, fStat.Mode()&0111)
+		}
+
+		rwMode := copiedStat.Mode() &^ 0111 // unset the executable permission from file mode
+		if rwMode != wantFileRWMode {
+			return fmt.Errorf("file %q rw mode is %v, want %v",
+				path, rwMode, wantFileRWStat.Mode())
+		}
+		return nil
+	})
+}
+
 func TestCopyFSWithSymlinks(t *testing.T) {
 	// Test it with absolute and relative symlinks that point inside and outside the tree.
 	testenv.MustHaveSymlink(t)
 
 	// Create a directory and file outside.
 	tmpDir := t.TempDir()
-	outsideDir, err := MkdirTemp(tmpDir, "copyfs_out_")
-	if err != nil {
-		t.Fatalf("MkdirTemp: %v", err)
+	outsideDir := filepath.Join(tmpDir, "copyfs_out")
+	if err := Mkdir(outsideDir, 0755); err != nil {
+		t.Fatalf("Mkdir: %v", err)
 	}
 	outsideFile := filepath.Join(outsideDir, "file.out.txt")
 
@@ -3426,9 +3672,9 @@ func TestCopyFSWithSymlinks(t *testing.T) {
 	}
 
 	// Create a directory and file inside.
-	insideDir, err := MkdirTemp(tmpDir, "copyfs_in_")
-	if err != nil {
-		t.Fatalf("MkdirTemp: %v", err)
+	insideDir := filepath.Join(tmpDir, "copyfs_in")
+	if err := Mkdir(insideDir, 0755); err != nil {
+		t.Fatalf("Mkdir: %v", err)
 	}
 	insideFile := filepath.Join(insideDir, "file.in.txt")
 	if err := WriteFile(insideFile, []byte("Testing CopyFS inside"), 0644); err != nil {
@@ -3474,9 +3720,9 @@ func TestCopyFSWithSymlinks(t *testing.T) {
 	// Copy the directory tree and verify.
 	forceMFTUpdateOnWindows(t, insideDir)
 	fsys := DirFS(insideDir)
-	tmpDupDir, err := MkdirTemp(tmpDir, "copyfs_dup_")
-	if err != nil {
-		t.Fatalf("MkdirTemp: %v", err)
+	tmpDupDir := filepath.Join(tmpDir, "copyfs_dup")
+	if err := Mkdir(tmpDupDir, 0755); err != nil {
+		t.Fatalf("Mkdir: %v", err)
 	}
 
 	// TODO(panjf2000): symlinks are currently not supported, and a specific error
@@ -3548,3 +3794,57 @@ func TestCopyFSWithSymlinks(t *testing.T) {
 		t.Fatal("comparing two directories:", err)
 	}
 }
+
+func TestAppendDoesntOverwrite(t *testing.T) {
+	testMaybeRooted(t, func(t *testing.T, r *Root) {
+		name := "file"
+		if err := WriteFile(name, []byte("hello"), 0666); err != nil {
+			t.Fatal(err)
+		}
+		var f *File
+		var err error
+		if r == nil {
+			f, err = OpenFile(name, O_APPEND|O_WRONLY, 0)
+		} else {
+			f, err = r.OpenFile(name, O_APPEND|O_WRONLY, 0)
+		}
+		if err != nil {
+			t.Fatal(err)
+		}
+		if _, err := f.Write([]byte(" world")); err != nil {
+			f.Close()
+			t.Fatal(err)
+		}
+		if err := f.Close(); err != nil {
+			t.Fatal(err)
+		}
+		got, err := ReadFile(name)
+		if err != nil {
+			t.Fatal(err)
+		}
+		want := "hello world"
+		if string(got) != want {
+			t.Fatalf("got %q, want %q", got, want)
+		}
+	})
+}
+
+func TestRemoveReadOnlyFile(t *testing.T) {
+	testMaybeRooted(t, func(t *testing.T, r *Root) {
+		if err := WriteFile("file", []byte("1"), 0); err != nil {
+			t.Fatal(err)
+		}
+		var err error
+		if r == nil {
+			err = Remove("file")
+		} else {
+			err = r.Remove("file")
+		}
+		if err != nil {
+			t.Fatalf("Remove read-only file: %v", err)
+		}
+		if _, err := Stat("file"); !IsNotExist(err) {
+			t.Fatalf("Stat read-only file after removal: %v (want IsNotExist)", err)
+		}
+	})
+}
diff --git a/src/os/os_unix_test.go b/src/os/os_unix_test.go
index fcc75e5e..7e728195 100644
--- a/src/os/os_unix_test.go
+++ b/src/os/os_unix_test.go
@@ -233,7 +233,9 @@ func TestMkdirStickyUmask(t *testing.T) {
 	if runtime.GOOS == "wasip1" {
 		t.Skip("file permissions not supported on " + runtime.GOOS)
 	}
-	t.Parallel()
+	// Issue #69788: This test temporarily changes the umask for testing purposes,
+	// so it shouldn't be run in parallel with other test cases
+	// to avoid other tests (e.g., TestCopyFS) creating files with an unintended umask.
 
 	const umask = 0077
 	dir := t.TempDir()
@@ -372,7 +374,7 @@ func TestSplitPath(t *testing.T) {
 //
 // Regression test for go.dev/issue/60181
 func TestIssue60181(t *testing.T) {
-	defer chtmpdir(t)()
+	t.Chdir(t.TempDir())
 
 	want := "hello gopher"
 
diff --git a/src/os/os_windows_test.go b/src/os/os_windows_test.go
index caff0111..31c37901 100644
--- a/src/os/os_windows_test.go
+++ b/src/os/os_windows_test.go
@@ -17,7 +17,6 @@ import (
 	"os"
 	"os/exec"
 	"path/filepath"
-	"reflect"
 	"runtime"
 	"slices"
 	"strings"
@@ -33,28 +32,8 @@ var winreadlinkvolume = godebug.New("winreadlinkvolume")
 // For TestRawConnReadWrite.
 type syscallDescriptor = syscall.Handle
 
-// chdir changes the current working directory to the named directory,
-// and then restore the original working directory at the end of the test.
-func chdir(t *testing.T, dir string) {
-	olddir, err := os.Getwd()
-	if err != nil {
-		t.Fatalf("chdir: %v", err)
-	}
-	if err := os.Chdir(dir); err != nil {
-		t.Fatalf("chdir %s: %v", dir, err)
-	}
-
-	t.Cleanup(func() {
-		if err := os.Chdir(olddir); err != nil {
-			t.Errorf("chdir to original working directory %s: %v", olddir, err)
-			os.Exit(1)
-		}
-	})
-}
-
 func TestSameWindowsFile(t *testing.T) {
-	temp := t.TempDir()
-	chdir(t, temp)
+	t.Chdir(t.TempDir())
 
 	f, err := os.Create("a")
 	if err != nil {
@@ -100,7 +79,7 @@ type dirLinkTest struct {
 
 func testDirLinks(t *testing.T, tests []dirLinkTest) {
 	tmpdir := t.TempDir()
-	chdir(t, tmpdir)
+	t.Chdir(tmpdir)
 
 	dir := filepath.Join(tmpdir, "dir")
 	err := os.Mkdir(dir, 0777)
@@ -459,7 +438,7 @@ func TestNetworkSymbolicLink(t *testing.T) {
 	const _NERR_ServerNotStarted = syscall.Errno(2114)
 
 	dir := t.TempDir()
-	chdir(t, dir)
+	t.Chdir(dir)
 
 	pid := os.Getpid()
 	shareName := fmt.Sprintf("GoSymbolicLinkTestShare%d", pid)
@@ -562,8 +541,7 @@ func TestStatLxSymLink(t *testing.T) {
 		t.Skip("skipping: WSL not detected")
 	}
 
-	temp := t.TempDir()
-	chdir(t, temp)
+	t.Chdir(t.TempDir())
 
 	const target = "target"
 	const link = "link"
@@ -630,7 +608,7 @@ func TestBadNetPathError(t *testing.T) {
 }
 
 func TestStatDir(t *testing.T) {
-	defer chtmpdir(t)()
+	t.Chdir(t.TempDir())
 
 	f, err := os.Open(".")
 	if err != nil {
@@ -660,7 +638,7 @@ func TestStatDir(t *testing.T) {
 
 func TestOpenVolumeName(t *testing.T) {
 	tmpdir := t.TempDir()
-	chdir(t, tmpdir)
+	t.Chdir(tmpdir)
 
 	want := []string{"file1", "file2", "file3", "gopher.txt"}
 	slices.Sort(want)
@@ -778,7 +756,7 @@ func TestReadStdin(t *testing.T) {
 					for len(want) < 5 {
 						want = append(want, "")
 					}
-					if !reflect.DeepEqual(all, want) {
+					if !slices.Equal(all, want) {
 						t.Errorf("reading %q:\nhave %x\nwant %x", s, all, want)
 					}
 				})
@@ -953,7 +931,9 @@ func findOneDriveDir() (string, error) {
 		return "", fmt.Errorf("reading UserFolder failed: %v", err)
 	}
 
-	if valtype == registry.EXPAND_SZ {
+	// REG_SZ values may also contain environment variables that need to be expanded.
+	// It's recommended but not required to use REG_EXPAND_SZ for paths that contain environment variables.
+	if valtype == registry.EXPAND_SZ || valtype == registry.SZ {
 		expanded, err := registry.ExpandString(path)
 		if err != nil {
 			return "", fmt.Errorf("expanding UserFolder failed: %v", err)
@@ -1012,6 +992,8 @@ func TestFileStatNUL(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
+	defer f.Close()
+
 	fi, err := f.Stat()
 	if err != nil {
 		t.Fatal(err)
@@ -1037,8 +1019,8 @@ func TestStatNUL(t *testing.T) {
 // works on Windows when developer mode is active.
 // This is supported starting Windows 10 (1703, v10.0.14972).
 func TestSymlinkCreation(t *testing.T) {
-	if !testenv.HasSymlink() && !isWindowsDeveloperModeActive() {
-		t.Skip("Windows developer mode is not active")
+	if !testenv.HasSymlink() {
+		t.Skip("skipping test; no symlink support")
 	}
 	t.Parallel()
 
@@ -1054,23 +1036,6 @@ func TestSymlinkCreation(t *testing.T) {
 	}
 }
 
-// isWindowsDeveloperModeActive checks whether or not the developer mode is active on Windows 10.
-// Returns false for prior Windows versions.
-// see https://docs.microsoft.com/en-us/windows/uwp/get-started/enable-your-device-for-development
-func isWindowsDeveloperModeActive() bool {
-	key, err := registry.OpenKey(registry.LOCAL_MACHINE, "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\AppModelUnlock", registry.READ)
-	if err != nil {
-		return false
-	}
-
-	val, _, err := key.GetIntegerValue("AllowDevelopmentWithoutDevLicense")
-	if err != nil {
-		return false
-	}
-
-	return val != 0
-}
-
 // TestRootRelativeDirSymlink verifies that symlinks to paths relative to the
 // drive root (beginning with "\" but no volume name) are created with the
 // correct symlink type.
@@ -1130,14 +1095,7 @@ func TestWorkingDirectoryRelativeSymlink(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	defer func() {
-		if err := os.Chdir(oldwd); err != nil {
-			t.Fatal(err)
-		}
-	}()
-	if err := os.Chdir(temp); err != nil {
-		t.Fatal(err)
-	}
+	t.Chdir(temp)
 	t.Logf("Chdir(%#q)", temp)
 
 	wdRelDir := filepath.VolumeName(temp) + `dir\sub` // no backslash after volume.
@@ -1222,10 +1180,7 @@ func TestRootDirAsTemp(t *testing.T) {
 	testenv.MustHaveExec(t)
 	t.Parallel()
 
-	exe, err := os.Executable()
-	if err != nil {
-		t.Fatal(err)
-	}
+	exe := testenv.Executable(t)
 
 	newtmp, err := findUnusedDriveLetter()
 	if err != nil {
@@ -1301,6 +1256,9 @@ func TestReadlink(t *testing.T) {
 		}
 
 		t.Run(name, func(t *testing.T) {
+			if !tt.junction {
+				testenv.MustHaveSymlink(t)
+			}
 			if !tt.relative {
 				t.Parallel()
 			}
@@ -1328,7 +1286,7 @@ func TestReadlink(t *testing.T) {
 				} else {
 					want = relTarget
 				}
-				chdir(t, tmpdir)
+				t.Chdir(tmpdir)
 				link = filepath.Base(link)
 				target = relTarget
 			} else {
diff --git a/src/os/path_windows_test.go b/src/os/path_windows_test.go
index 0b5d7099..3fa02e2a 100644
--- a/src/os/path_windows_test.go
+++ b/src/os/path_windows_test.go
@@ -224,7 +224,7 @@ func TestRemoveAllLongPathRelative(t *testing.T) {
 	// Test that RemoveAll doesn't hang with long relative paths.
 	// See go.dev/issue/36375.
 	tmp := t.TempDir()
-	chdir(t, tmp)
+	t.Chdir(tmp)
 	dir := filepath.Join(tmp, "foo", "bar", strings.Repeat("a", 150), strings.Repeat("b", 150))
 	err := os.MkdirAll(dir, 0755)
 	if err != nil {
@@ -265,7 +265,7 @@ func TestLongPathAbs(t *testing.T) {
 }
 
 func TestLongPathRel(t *testing.T) {
-	chdir(t, t.TempDir())
+	t.Chdir(t.TempDir())
 
 	target := strings.Repeat("b\\", 300)
 	testLongPathAbs(t, target)
diff --git a/src/os/pidfd_linux.go b/src/os/pidfd_linux.go
index 0bfef775..fe4a743c 100644
--- a/src/os/pidfd_linux.go
+++ b/src/os/pidfd_linux.go
@@ -21,7 +21,7 @@ import (
 	"runtime"
 	"sync"
 	"syscall"
-	"unsafe"
+	_ "unsafe" // for linkname
 )
 
 // ensurePidfd initializes the PidFD field in sysAttr if it is not already set.
@@ -78,9 +78,6 @@ func pidfdFind(pid int) (uintptr, error) {
 	return h, nil
 }
 
-// _P_PIDFD is used as idtype argument to waitid syscall.
-const _P_PIDFD = 3
-
 func (p *Process) pidfdWait() (*ProcessState, error) {
 	// When pidfd is used, there is no wait/kill race (described in CL 23967)
 	// because the PID recycle issue doesn't exist (IOW, pidfd, unlike PID,
@@ -104,16 +101,12 @@ func (p *Process) pidfdWait() (*ProcessState, error) {
 	var (
 		info   unix.SiginfoChild
 		rusage syscall.Rusage
-		e      syscall.Errno
 	)
-	for {
-		_, _, e = syscall.Syscall6(syscall.SYS_WAITID, _P_PIDFD, handle, uintptr(unsafe.Pointer(&info)), syscall.WEXITED, uintptr(unsafe.Pointer(&rusage)), 0)
-		if e != syscall.EINTR {
-			break
-		}
-	}
-	if e != 0 {
-		return nil, NewSyscallError("waitid", e)
+	err := ignoringEINTR(func() error {
+		return unix.Waitid(unix.P_PIDFD, int(handle), &info, syscall.WEXITED, &rusage)
+	})
+	if err != nil {
+		return nil, NewSyscallError("waitid", err)
 	}
 	// Release the Process' handle reference, in addition to the reference
 	// we took above.
@@ -168,12 +161,9 @@ func checkPidfd() error {
 	defer syscall.Close(int(fd))
 
 	// Check waitid(P_PIDFD) works.
-	for {
-		_, _, err = syscall.Syscall6(syscall.SYS_WAITID, _P_PIDFD, fd, 0, syscall.WEXITED, 0, 0)
-		if err != syscall.EINTR {
-			break
-		}
-	}
+	err = ignoringEINTR(func() error {
+		return unix.Waitid(unix.P_PIDFD, int(fd), nil, syscall.WEXITED, nil)
+	})
 	// Expect ECHILD from waitid since we're not our own parent.
 	if err != syscall.ECHILD {
 		return NewSyscallError("pidfd_wait", err)
diff --git a/src/os/pidfd_linux_test.go b/src/os/pidfd_linux_test.go
index c1f41d02..6b10798d 100644
--- a/src/os/pidfd_linux_test.go
+++ b/src/os/pidfd_linux_test.go
@@ -93,11 +93,7 @@ func TestStartProcessWithPidfd(t *testing.T) {
 
 // Issue #69284
 func TestPidfdLeak(t *testing.T) {
-	testenv.MustHaveExec(t)
-	exe, err := os.Executable()
-	if err != nil {
-		t.Fatal(err)
-	}
+	exe := testenv.Executable(t)
 
 	// Find the next 10 descriptors.
 	// We need to get more than one descriptor in practice;
diff --git a/src/os/pidfd_other.go b/src/os/pidfd_other.go
index ba9cbcb9..7a282307 100644
--- a/src/os/pidfd_other.go
+++ b/src/os/pidfd_other.go
@@ -20,8 +20,6 @@ func pidfdFind(_ int) (uintptr, error) {
 	return 0, syscall.ENOSYS
 }
 
-func (p *Process) pidfdRelease() {}
-
 func (_ *Process) pidfdWait() (*ProcessState, error) {
 	panic("unreachable")
 }
diff --git a/src/os/read_test.go b/src/os/read_test.go
index 1f79e89b..4659191d 100644
--- a/src/os/read_test.go
+++ b/src/os/read_test.go
@@ -78,16 +78,11 @@ func TestReadOnlyWriteFile(t *testing.T) {
 	t.Parallel()
 
 	// We don't want to use CreateTemp directly, since that opens a file for us as 0600.
-	tempDir, err := MkdirTemp("", t.Name())
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer RemoveAll(tempDir)
-	filename := filepath.Join(tempDir, "blurp.txt")
+	filename := filepath.Join(t.TempDir(), "blurp.txt")
 
 	shmorp := []byte("shmorp")
 	florp := []byte("florp")
-	err = WriteFile(filename, shmorp, 0444)
+	err := WriteFile(filename, shmorp, 0444)
 	if err != nil {
 		t.Fatalf("WriteFile %s: %v", filename, err)
 	}
diff --git a/src/os/readfrom_freebsd_test.go b/src/os/readfrom_freebsd_test.go
new file mode 100644
index 00000000..18604995
--- /dev/null
+++ b/src/os/readfrom_freebsd_test.go
@@ -0,0 +1,57 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package os_test
+
+import (
+	"internal/poll"
+	. "os"
+	"testing"
+)
+
+var (
+	copyFileTests = []copyFileTestFunc{newCopyFileRangeTest}
+	copyFileHooks = []copyFileTestHook{hookCopyFileRange}
+)
+
+func testCopyFiles(t *testing.T, size, limit int64) {
+	testCopyFileRange(t, size, limit)
+}
+
+func testCopyFileRange(t *testing.T, size int64, limit int64) {
+	dst, src, data, hook, name := newCopyFileRangeTest(t, size)
+	testCopyFile(t, dst, src, data, hook, limit, name)
+}
+
+// newCopyFileRangeTest initializes a new test for copy_file_range.
+// It hooks package os' call to poll.CopyFileRange and returns the hook,
+// so it can be inspected.
+func newCopyFileRangeTest(t *testing.T, size int64) (dst, src *File, data []byte, hook *copyFileHook, name string) {
+	t.Helper()
+
+	name = "newCopyFileRangeTest"
+
+	dst, src, data = newCopyFileTest(t, size)
+	hook, _ = hookCopyFileRange(t)
+
+	return
+}
+
+func hookCopyFileRange(t *testing.T) (hook *copyFileHook, name string) {
+	name = "hookCopyFileRange"
+
+	hook = new(copyFileHook)
+	orig := *PollCopyFileRangeP
+	t.Cleanup(func() {
+		*PollCopyFileRangeP = orig
+	})
+	*PollCopyFileRangeP = func(dst, src *poll.FD, remain int64) (int64, bool, error) {
+		hook.called = true
+		hook.dstfd = dst.Sysfd
+		hook.srcfd = src.Sysfd
+		hook.written, hook.handled, hook.err = orig(dst, src, remain)
+		return hook.written, hook.handled, hook.err
+	}
+	return
+}
diff --git a/src/os/readfrom_linux_test.go b/src/os/readfrom_linux_test.go
index 45867477..d33f9cf9 100644
--- a/src/os/readfrom_linux_test.go
+++ b/src/os/readfrom_linux_test.go
@@ -15,247 +15,12 @@ import (
 	. "os"
 	"path/filepath"
 	"strconv"
-	"strings"
 	"sync"
 	"syscall"
 	"testing"
 	"time"
 )
 
-func TestCopyFileRange(t *testing.T) {
-	sizes := []int{
-		1,
-		42,
-		1025,
-		syscall.Getpagesize() + 1,
-		32769,
-	}
-	t.Run("Basic", func(t *testing.T) {
-		for _, size := range sizes {
-			t.Run(strconv.Itoa(size), func(t *testing.T) {
-				testCopyFileRange(t, int64(size), -1)
-			})
-		}
-	})
-	t.Run("Limited", func(t *testing.T) {
-		t.Run("OneLess", func(t *testing.T) {
-			for _, size := range sizes {
-				t.Run(strconv.Itoa(size), func(t *testing.T) {
-					testCopyFileRange(t, int64(size), int64(size)-1)
-				})
-			}
-		})
-		t.Run("Half", func(t *testing.T) {
-			for _, size := range sizes {
-				t.Run(strconv.Itoa(size), func(t *testing.T) {
-					testCopyFileRange(t, int64(size), int64(size)/2)
-				})
-			}
-		})
-		t.Run("More", func(t *testing.T) {
-			for _, size := range sizes {
-				t.Run(strconv.Itoa(size), func(t *testing.T) {
-					testCopyFileRange(t, int64(size), int64(size)+7)
-				})
-			}
-		})
-	})
-	t.Run("DoesntTryInAppendMode", func(t *testing.T) {
-		dst, src, data, hook := newCopyFileRangeTest(t, 42)
-
-		dst2, err := OpenFile(dst.Name(), O_RDWR|O_APPEND, 0755)
-		if err != nil {
-			t.Fatal(err)
-		}
-		defer dst2.Close()
-
-		if _, err := io.Copy(dst2, src); err != nil {
-			t.Fatal(err)
-		}
-		if hook.called {
-			t.Fatal("called poll.CopyFileRange for destination in O_APPEND mode")
-		}
-		mustSeekStart(t, dst2)
-		mustContainData(t, dst2, data) // through traditional means
-	})
-	t.Run("CopyFileItself", func(t *testing.T) {
-		hook := hookCopyFileRange(t)
-
-		f, err := CreateTemp("", "file-readfrom-itself-test")
-		if err != nil {
-			t.Fatalf("failed to create tmp file: %v", err)
-		}
-		t.Cleanup(func() {
-			f.Close()
-			Remove(f.Name())
-		})
-
-		data := []byte("hello world!")
-		if _, err := f.Write(data); err != nil {
-			t.Fatalf("failed to create and feed the file: %v", err)
-		}
-
-		if err := f.Sync(); err != nil {
-			t.Fatalf("failed to save the file: %v", err)
-		}
-
-		// Rewind it.
-		if _, err := f.Seek(0, io.SeekStart); err != nil {
-			t.Fatalf("failed to rewind the file: %v", err)
-		}
-
-		// Read data from the file itself.
-		if _, err := io.Copy(f, f); err != nil {
-			t.Fatalf("failed to read from the file: %v", err)
-		}
-
-		if !hook.called || hook.written != 0 || hook.handled || hook.err != nil {
-			t.Fatalf("poll.CopyFileRange should be called and return the EINVAL error, but got hook.called=%t, hook.err=%v", hook.called, hook.err)
-		}
-
-		// Rewind it.
-		if _, err := f.Seek(0, io.SeekStart); err != nil {
-			t.Fatalf("failed to rewind the file: %v", err)
-		}
-
-		data2, err := io.ReadAll(f)
-		if err != nil {
-			t.Fatalf("failed to read from the file: %v", err)
-		}
-
-		// It should wind up a double of the original data.
-		if strings.Repeat(string(data), 2) != string(data2) {
-			t.Fatalf("data mismatch: %s != %s", string(data), string(data2))
-		}
-	})
-	t.Run("NotRegular", func(t *testing.T) {
-		t.Run("BothPipes", func(t *testing.T) {
-			hook := hookCopyFileRange(t)
-
-			pr1, pw1, err := Pipe()
-			if err != nil {
-				t.Fatal(err)
-			}
-			defer pr1.Close()
-			defer pw1.Close()
-
-			pr2, pw2, err := Pipe()
-			if err != nil {
-				t.Fatal(err)
-			}
-			defer pr2.Close()
-			defer pw2.Close()
-
-			// The pipe is empty, and PIPE_BUF is large enough
-			// for this, by (POSIX) definition, so there is no
-			// need for an additional goroutine.
-			data := []byte("hello")
-			if _, err := pw1.Write(data); err != nil {
-				t.Fatal(err)
-			}
-			pw1.Close()
-
-			n, err := io.Copy(pw2, pr1)
-			if err != nil {
-				t.Fatal(err)
-			}
-			if n != int64(len(data)) {
-				t.Fatalf("transferred %d, want %d", n, len(data))
-			}
-			if !hook.called {
-				t.Fatalf("should have called poll.CopyFileRange")
-			}
-			pw2.Close()
-			mustContainData(t, pr2, data)
-		})
-		t.Run("DstPipe", func(t *testing.T) {
-			dst, src, data, hook := newCopyFileRangeTest(t, 255)
-			dst.Close()
-
-			pr, pw, err := Pipe()
-			if err != nil {
-				t.Fatal(err)
-			}
-			defer pr.Close()
-			defer pw.Close()
-
-			n, err := io.Copy(pw, src)
-			if err != nil {
-				t.Fatal(err)
-			}
-			if n != int64(len(data)) {
-				t.Fatalf("transferred %d, want %d", n, len(data))
-			}
-			if !hook.called {
-				t.Fatalf("should have called poll.CopyFileRange")
-			}
-			pw.Close()
-			mustContainData(t, pr, data)
-		})
-		t.Run("SrcPipe", func(t *testing.T) {
-			dst, src, data, hook := newCopyFileRangeTest(t, 255)
-			src.Close()
-
-			pr, pw, err := Pipe()
-			if err != nil {
-				t.Fatal(err)
-			}
-			defer pr.Close()
-			defer pw.Close()
-
-			// The pipe is empty, and PIPE_BUF is large enough
-			// for this, by (POSIX) definition, so there is no
-			// need for an additional goroutine.
-			if _, err := pw.Write(data); err != nil {
-				t.Fatal(err)
-			}
-			pw.Close()
-
-			n, err := io.Copy(dst, pr)
-			if err != nil {
-				t.Fatal(err)
-			}
-			if n != int64(len(data)) {
-				t.Fatalf("transferred %d, want %d", n, len(data))
-			}
-			if !hook.called {
-				t.Fatalf("should have called poll.CopyFileRange")
-			}
-			mustSeekStart(t, dst)
-			mustContainData(t, dst, data)
-		})
-	})
-	t.Run("Nil", func(t *testing.T) {
-		var nilFile *File
-		anyFile, err := CreateTemp("", "")
-		if err != nil {
-			t.Fatal(err)
-		}
-		defer Remove(anyFile.Name())
-		defer anyFile.Close()
-
-		if _, err := io.Copy(nilFile, nilFile); err != ErrInvalid {
-			t.Errorf("io.Copy(nilFile, nilFile) = %v, want %v", err, ErrInvalid)
-		}
-		if _, err := io.Copy(anyFile, nilFile); err != ErrInvalid {
-			t.Errorf("io.Copy(anyFile, nilFile) = %v, want %v", err, ErrInvalid)
-		}
-		if _, err := io.Copy(nilFile, anyFile); err != ErrInvalid {
-			t.Errorf("io.Copy(nilFile, anyFile) = %v, want %v", err, ErrInvalid)
-		}
-
-		if _, err := nilFile.ReadFrom(nilFile); err != ErrInvalid {
-			t.Errorf("nilFile.ReadFrom(nilFile) = %v, want %v", err, ErrInvalid)
-		}
-		if _, err := anyFile.ReadFrom(nilFile); err != ErrInvalid {
-			t.Errorf("anyFile.ReadFrom(nilFile) = %v, want %v", err, ErrInvalid)
-		}
-		if _, err := nilFile.ReadFrom(anyFile); err != ErrInvalid {
-			t.Errorf("nilFile.ReadFrom(anyFile) = %v, want %v", err, ErrInvalid)
-		}
-	})
-}
-
 func TestSpliceFile(t *testing.T) {
 	sizes := []int{
 		1,
@@ -476,110 +241,33 @@ func testSpliceToTTY(t *testing.T, proto string, size int64) {
 	}
 }
 
+var (
+	copyFileTests = []copyFileTestFunc{newCopyFileRangeTest}
+	copyFileHooks = []copyFileTestHook{hookCopyFileRange}
+)
+
+func testCopyFiles(t *testing.T, size, limit int64) {
+	testCopyFileRange(t, size, limit)
+}
+
 func testCopyFileRange(t *testing.T, size int64, limit int64) {
-	dst, src, data, hook := newCopyFileRangeTest(t, size)
-
-	// If we have a limit, wrap the reader.
-	var (
-		realsrc io.Reader
-		lr      *io.LimitedReader
-	)
-	if limit >= 0 {
-		lr = &io.LimitedReader{N: limit, R: src}
-		realsrc = lr
-		if limit < int64(len(data)) {
-			data = data[:limit]
-		}
-	} else {
-		realsrc = src
-	}
-
-	// Now call ReadFrom (through io.Copy), which will hopefully call
-	// poll.CopyFileRange.
-	n, err := io.Copy(dst, realsrc)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	// If we didn't have a limit, we should have called poll.CopyFileRange
-	// with the right file descriptor arguments.
-	if limit > 0 && !hook.called {
-		t.Fatal("never called poll.CopyFileRange")
-	}
-	if hook.called && hook.dstfd != int(dst.Fd()) {
-		t.Fatalf("wrong destination file descriptor: got %d, want %d", hook.dstfd, dst.Fd())
-	}
-	if hook.called && hook.srcfd != int(src.Fd()) {
-		t.Fatalf("wrong source file descriptor: got %d, want %d", hook.srcfd, src.Fd())
-	}
-
-	// Check that the offsets after the transfer make sense, that the size
-	// of the transfer was reported correctly, and that the destination
-	// file contains exactly the bytes we expect it to contain.
-	dstoff, err := dst.Seek(0, io.SeekCurrent)
-	if err != nil {
-		t.Fatal(err)
-	}
-	srcoff, err := src.Seek(0, io.SeekCurrent)
-	if err != nil {
-		t.Fatal(err)
-	}
-	if dstoff != srcoff {
-		t.Errorf("offsets differ: dstoff = %d, srcoff = %d", dstoff, srcoff)
-	}
-	if dstoff != int64(len(data)) {
-		t.Errorf("dstoff = %d, want %d", dstoff, len(data))
-	}
-	if n != int64(len(data)) {
-		t.Errorf("short ReadFrom: wrote %d bytes, want %d", n, len(data))
-	}
-	mustSeekStart(t, dst)
-	mustContainData(t, dst, data)
-
-	// If we had a limit, check that it was updated.
-	if lr != nil {
-		if want := limit - n; lr.N != want {
-			t.Fatalf("didn't update limit correctly: got %d, want %d", lr.N, want)
-		}
-	}
+	dst, src, data, hook, name := newCopyFileRangeTest(t, size)
+	testCopyFile(t, dst, src, data, hook, limit, name)
 }
 
 // newCopyFileRangeTest initializes a new test for copy_file_range.
 //
-// It creates source and destination files, and populates the source file
-// with random data of the specified size. It also hooks package os' call
-// to poll.CopyFileRange and returns the hook so it can be inspected.
-func newCopyFileRangeTest(t *testing.T, size int64) (dst, src *File, data []byte, hook *copyFileRangeHook) {
+// It hooks package os' call to poll.CopyFileRange and returns the hook,
+// so it can be inspected.
+func newCopyFileRangeTest(t *testing.T, size int64) (dst, src *File, data []byte, hook *copyFileHook, name string) {
 	t.Helper()
 
-	hook = hookCopyFileRange(t)
-	tmp := t.TempDir()
+	name = "newCopyFileRangeTest"
 
-	src, err := Create(filepath.Join(tmp, "src"))
-	if err != nil {
-		t.Fatal(err)
-	}
-	t.Cleanup(func() { src.Close() })
+	dst, src, data = newCopyFileTest(t, size)
+	hook, _ = hookCopyFileRange(t)
 
-	dst, err = Create(filepath.Join(tmp, "dst"))
-	if err != nil {
-		t.Fatal(err)
-	}
-	t.Cleanup(func() { dst.Close() })
-
-	// Populate the source file with data, then rewind it, so it can be
-	// consumed by copy_file_range(2).
-	prng := rand.New(rand.NewSource(time.Now().Unix()))
-	data = make([]byte, size)
-	prng.Read(data)
-	if _, err := src.Write(data); err != nil {
-		t.Fatal(err)
-	}
-	if _, err := src.Seek(0, io.SeekStart); err != nil {
-		t.Fatal(err)
-	}
-
-	return dst, src, data, hook
+	return
 }
 
 // newSpliceFileTest initializes a new test for splice.
@@ -616,63 +304,22 @@ func newSpliceFileTest(t *testing.T, proto string, size int64) (*File, net.Conn,
 	return dst, server, data, hook, func() { <-done }
 }
 
-// mustContainData ensures that the specified file contains exactly the
-// specified data.
-func mustContainData(t *testing.T, f *File, data []byte) {
-	t.Helper()
+func hookCopyFileRange(t *testing.T) (hook *copyFileHook, name string) {
+	name = "hookCopyFileRange"
 
-	got := make([]byte, len(data))
-	if _, err := io.ReadFull(f, got); err != nil {
-		t.Fatal(err)
-	}
-	if !bytes.Equal(got, data) {
-		t.Fatalf("didn't get the same data back from %s", f.Name())
-	}
-	if _, err := f.Read(make([]byte, 1)); err != io.EOF {
-		t.Fatalf("not at EOF")
-	}
-}
-
-func mustSeekStart(t *testing.T, f *File) {
-	if _, err := f.Seek(0, io.SeekStart); err != nil {
-		t.Fatal(err)
-	}
-}
-
-func hookCopyFileRange(t *testing.T) *copyFileRangeHook {
-	h := new(copyFileRangeHook)
-	h.install()
-	t.Cleanup(h.uninstall)
-	return h
-}
-
-type copyFileRangeHook struct {
-	called bool
-	dstfd  int
-	srcfd  int
-	remain int64
-
-	written int64
-	handled bool
-	err     error
-
-	original func(dst, src *poll.FD, remain int64) (int64, bool, error)
-}
-
-func (h *copyFileRangeHook) install() {
-	h.original = *PollCopyFileRangeP
+	hook = new(copyFileHook)
+	orig := *PollCopyFileRangeP
+	t.Cleanup(func() {
+		*PollCopyFileRangeP = orig
+	})
 	*PollCopyFileRangeP = func(dst, src *poll.FD, remain int64) (int64, bool, error) {
-		h.called = true
-		h.dstfd = dst.Sysfd
-		h.srcfd = src.Sysfd
-		h.remain = remain
-		h.written, h.handled, h.err = h.original(dst, src, remain)
-		return h.written, h.handled, h.err
+		hook.called = true
+		hook.dstfd = dst.Sysfd
+		hook.srcfd = src.Sysfd
+		hook.written, hook.handled, hook.err = orig(dst, src, remain)
+		return hook.written, hook.handled, hook.err
 	}
-}
-
-func (h *copyFileRangeHook) uninstall() {
-	*PollCopyFileRangeP = h.original
+	return
 }
 
 func hookSpliceFile(t *testing.T) *spliceFileHook {
diff --git a/src/os/readfrom_sendfile_test.go b/src/os/readfrom_sendfile_test.go
new file mode 100644
index 00000000..86ef71ee
--- /dev/null
+++ b/src/os/readfrom_sendfile_test.go
@@ -0,0 +1,55 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build solaris
+
+package os_test
+
+import (
+	"io"
+	. "os"
+	"testing"
+)
+
+func BenchmarkSendFile(b *testing.B) {
+	hook := hookSendFileTB(b)
+
+	// 1 GiB file size for copy.
+	const fileSize = 1 << 30
+
+	src, _ := createTempFile(b, "benchmark-sendfile-src", int64(fileSize))
+	dst, err := CreateTemp(b.TempDir(), "benchmark-sendfile-dst")
+	if err != nil {
+		b.Fatalf("failed to create temporary file of destination: %v", err)
+	}
+	b.Cleanup(func() {
+		dst.Close()
+	})
+
+	b.ReportAllocs()
+	b.SetBytes(int64(fileSize))
+	b.ResetTimer()
+
+	for i := 0; i <= b.N; i++ {
+		sent, err := io.Copy(dst, src)
+
+		if err != nil {
+			b.Fatalf("failed to copy data: %v", err)
+		}
+		if !hook.called {
+			b.Fatalf("should have called the sendfile(2)")
+		}
+		if sent != int64(fileSize) {
+			b.Fatalf("sent %d bytes, want %d", sent, fileSize)
+		}
+
+		// Rewind the files for the next iteration.
+		if _, err := src.Seek(0, io.SeekStart); err != nil {
+			b.Fatalf("failed to rewind the source file: %v", err)
+		}
+		if _, err := dst.Seek(0, io.SeekStart); err != nil {
+			b.Fatalf("failed to rewind the destination file: %v", err)
+		}
+	}
+}
diff --git a/src/os/readfrom_solaris_test.go b/src/os/readfrom_solaris_test.go
new file mode 100644
index 00000000..b11fbef0
--- /dev/null
+++ b/src/os/readfrom_solaris_test.go
@@ -0,0 +1,60 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package os_test
+
+import (
+	"internal/poll"
+	. "os"
+	"testing"
+)
+
+var (
+	copyFileTests = []copyFileTestFunc{newSendfileTest}
+	copyFileHooks = []copyFileTestHook{hookSendFile}
+)
+
+func testCopyFiles(t *testing.T, size, limit int64) {
+	testSendfile(t, size, limit)
+}
+
+func testSendfile(t *testing.T, size int64, limit int64) {
+	dst, src, data, hook, name := newSendfileTest(t, size)
+	testCopyFile(t, dst, src, data, hook, limit, name)
+}
+
+// newSendFileTest initializes a new test for sendfile over copy_file_range.
+// It hooks package os' call to poll.SendFile and returns the hook,
+// so it can be inspected.
+func newSendfileTest(t *testing.T, size int64) (dst, src *File, data []byte, hook *copyFileHook, name string) {
+	t.Helper()
+
+	name = "newSendfileTest"
+
+	dst, src, data = newCopyFileTest(t, size)
+	hook, _ = hookSendFile(t)
+
+	return
+}
+
+func hookSendFile(t *testing.T) (*copyFileHook, string) {
+	return hookSendFileTB(t), "hookSendFile"
+}
+
+func hookSendFileTB(tb testing.TB) *copyFileHook {
+	hook := new(copyFileHook)
+	orig := poll.TestHookDidSendFile
+	tb.Cleanup(func() {
+		poll.TestHookDidSendFile = orig
+	})
+	poll.TestHookDidSendFile = func(dstFD *poll.FD, src int, written int64, err error, handled bool) {
+		hook.called = true
+		hook.dstfd = dstFD.Sysfd
+		hook.srcfd = src
+		hook.written = written
+		hook.err = err
+		hook.handled = handled
+	}
+	return hook
+}
diff --git a/src/os/readfrom_unix_test.go b/src/os/readfrom_unix_test.go
new file mode 100644
index 00000000..dbe2b683
--- /dev/null
+++ b/src/os/readfrom_unix_test.go
@@ -0,0 +1,467 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build freebsd || linux || solaris
+
+package os_test
+
+import (
+	"bytes"
+	"io"
+	"math/rand"
+	. "os"
+	"runtime"
+	"strconv"
+	"strings"
+	"syscall"
+	"testing"
+	"time"
+)
+
+type (
+	copyFileTestFunc func(*testing.T, int64) (*File, *File, []byte, *copyFileHook, string)
+	copyFileTestHook func(*testing.T) (*copyFileHook, string)
+)
+
+func TestCopyFile(t *testing.T) {
+	sizes := []int{
+		1,
+		42,
+		1025,
+		syscall.Getpagesize() + 1,
+		32769,
+	}
+	t.Run("Basic", func(t *testing.T) {
+		for _, size := range sizes {
+			t.Run(strconv.Itoa(size), func(t *testing.T) {
+				testCopyFiles(t, int64(size), -1)
+			})
+		}
+	})
+	t.Run("Limited", func(t *testing.T) {
+		t.Run("OneLess", func(t *testing.T) {
+			for _, size := range sizes {
+				t.Run(strconv.Itoa(size), func(t *testing.T) {
+					testCopyFiles(t, int64(size), int64(size)-1)
+				})
+			}
+		})
+		t.Run("Half", func(t *testing.T) {
+			for _, size := range sizes {
+				t.Run(strconv.Itoa(size), func(t *testing.T) {
+					testCopyFiles(t, int64(size), int64(size)/2)
+				})
+			}
+		})
+		t.Run("More", func(t *testing.T) {
+			for _, size := range sizes {
+				t.Run(strconv.Itoa(size), func(t *testing.T) {
+					testCopyFiles(t, int64(size), int64(size)+7)
+				})
+			}
+		})
+	})
+	t.Run("DoesntTryInAppendMode", func(t *testing.T) {
+		for _, newTest := range copyFileTests {
+			dst, src, data, hook, testName := newTest(t, 42)
+
+			dst2, err := OpenFile(dst.Name(), O_RDWR|O_APPEND, 0755)
+			if err != nil {
+				t.Fatalf("%s: %v", testName, err)
+			}
+			defer dst2.Close()
+
+			if _, err := io.Copy(dst2, src); err != nil {
+				t.Fatalf("%s: %v", testName, err)
+			}
+			switch runtime.GOOS {
+			case "illumos", "solaris": // sendfile() on SunOS allows target file with O_APPEND set.
+				if !hook.called {
+					t.Fatalf("%s: should have called the hook even with destination in O_APPEND mode", testName)
+				}
+			default:
+				if hook.called {
+					t.Fatalf("%s: hook shouldn't be called with destination in O_APPEND mode", testName)
+				}
+			}
+			mustSeekStart(t, dst2)
+			mustContainData(t, dst2, data) // through traditional means
+		}
+	})
+	t.Run("CopyFileItself", func(t *testing.T) {
+		for _, hookFunc := range copyFileHooks {
+			hook, testName := hookFunc(t)
+
+			f, err := CreateTemp("", "file-readfrom-itself-test")
+			if err != nil {
+				t.Fatalf("%s: failed to create tmp file: %v", testName, err)
+			}
+			t.Cleanup(func() {
+				f.Close()
+				Remove(f.Name())
+			})
+
+			data := []byte("hello world!")
+			if _, err := f.Write(data); err != nil {
+				t.Fatalf("%s: failed to create and feed the file: %v", testName, err)
+			}
+
+			if err := f.Sync(); err != nil {
+				t.Fatalf("%s: failed to save the file: %v", testName, err)
+			}
+
+			// Rewind it.
+			if _, err := f.Seek(0, io.SeekStart); err != nil {
+				t.Fatalf("%s: failed to rewind the file: %v", testName, err)
+			}
+
+			// Read data from the file itself.
+			if _, err := io.Copy(f, f); err != nil {
+				t.Fatalf("%s: failed to read from the file: %v", testName, err)
+			}
+
+			if hook.written != 0 || hook.handled || hook.err != nil {
+				t.Fatalf("%s: File.readFrom is expected not to use any zero-copy techniques when copying itself."+
+					"got hook.written=%d, hook.handled=%t, hook.err=%v; expected hook.written=0, hook.handled=false, hook.err=nil",
+					testName, hook.written, hook.handled, hook.err)
+			}
+
+			switch testName {
+			case "hookCopyFileRange":
+				// For copy_file_range(2), it fails and returns EINVAL when the source and target
+				// refer to the same file and their ranges overlap. The hook should be called to
+				// get the returned error and fall back to generic copy.
+				if !hook.called {
+					t.Fatalf("%s: should have called the hook", testName)
+				}
+			case "hookSendFile", "hookSendFileOverCopyFileRange":
+				// For sendfile(2), it allows the source and target to refer to the same file and overlap.
+				// The hook should not be called and just fall back to generic copy directly.
+				if hook.called {
+					t.Fatalf("%s: shouldn't have called the hook", testName)
+				}
+			default:
+				t.Fatalf("%s: unexpected test", testName)
+			}
+
+			// Rewind it.
+			if _, err := f.Seek(0, io.SeekStart); err != nil {
+				t.Fatalf("%s: failed to rewind the file: %v", testName, err)
+			}
+
+			data2, err := io.ReadAll(f)
+			if err != nil {
+				t.Fatalf("%s: failed to read from the file: %v", testName, err)
+			}
+
+			// It should wind up a double of the original data.
+			if s := strings.Repeat(string(data), 2); s != string(data2) {
+				t.Fatalf("%s: file contained %s, expected %s", testName, data2, s)
+			}
+		}
+	})
+	t.Run("NotRegular", func(t *testing.T) {
+		t.Run("BothPipes", func(t *testing.T) {
+			for _, hookFunc := range copyFileHooks {
+				hook, testName := hookFunc(t)
+
+				pr1, pw1, err := Pipe()
+				if err != nil {
+					t.Fatalf("%s: %v", testName, err)
+				}
+				defer pr1.Close()
+				defer pw1.Close()
+
+				pr2, pw2, err := Pipe()
+				if err != nil {
+					t.Fatalf("%s: %v", testName, err)
+				}
+				defer pr2.Close()
+				defer pw2.Close()
+
+				// The pipe is empty, and PIPE_BUF is large enough
+				// for this, by (POSIX) definition, so there is no
+				// need for an additional goroutine.
+				data := []byte("hello")
+				if _, err := pw1.Write(data); err != nil {
+					t.Fatalf("%s: %v", testName, err)
+				}
+				pw1.Close()
+
+				n, err := io.Copy(pw2, pr1)
+				if err != nil {
+					t.Fatalf("%s: %v", testName, err)
+				}
+				if n != int64(len(data)) {
+					t.Fatalf("%s: transferred %d, want %d", testName, n, len(data))
+				}
+				switch runtime.GOOS {
+				case "illumos", "solaris":
+					// On solaris, We rely on File.Stat to get the size of the source file,
+					// which doesn't work for pipe.
+					// On illumos, We skip anything other than regular files conservatively
+					// for the target file, therefore the hook shouldn't have been called.
+					if hook.called {
+						t.Fatalf("%s: shouldn't have called the hook with a source or a destination of pipe", testName)
+					}
+				default:
+					if !hook.called {
+						t.Fatalf("%s: should have called the hook with both source and destination of pipe", testName)
+					}
+				}
+				pw2.Close()
+				mustContainData(t, pr2, data)
+			}
+		})
+		t.Run("DstPipe", func(t *testing.T) {
+			for _, newTest := range copyFileTests {
+				dst, src, data, hook, testName := newTest(t, 255)
+				dst.Close()
+
+				pr, pw, err := Pipe()
+				if err != nil {
+					t.Fatalf("%s: %v", testName, err)
+				}
+				defer pr.Close()
+				defer pw.Close()
+
+				n, err := io.Copy(pw, src)
+				if err != nil {
+					t.Fatalf("%s: %v", testName, err)
+				}
+				if n != int64(len(data)) {
+					t.Fatalf("%s: transferred %d, want %d", testName, n, len(data))
+				}
+				switch runtime.GOOS {
+				case "illumos":
+					// On illumos, We skip anything other than regular files conservatively
+					// for the target file, therefore the hook shouldn't have been called.
+					if hook.called {
+						t.Fatalf("%s: shouldn't have called the hook with a destination of pipe", testName)
+					}
+				default:
+					if !hook.called {
+						t.Fatalf("%s: should have called the hook with a destination of pipe", testName)
+					}
+				}
+				pw.Close()
+				mustContainData(t, pr, data)
+			}
+		})
+		t.Run("SrcPipe", func(t *testing.T) {
+			for _, newTest := range copyFileTests {
+				dst, src, data, hook, testName := newTest(t, 255)
+				src.Close()
+
+				pr, pw, err := Pipe()
+				if err != nil {
+					t.Fatalf("%s: %v", testName, err)
+				}
+				defer pr.Close()
+				defer pw.Close()
+
+				// The pipe is empty, and PIPE_BUF is large enough
+				// for this, by (POSIX) definition, so there is no
+				// need for an additional goroutine.
+				if _, err := pw.Write(data); err != nil {
+					t.Fatalf("%s: %v", testName, err)
+				}
+				pw.Close()
+
+				n, err := io.Copy(dst, pr)
+				if err != nil {
+					t.Fatalf("%s: %v", testName, err)
+				}
+				if n != int64(len(data)) {
+					t.Fatalf("%s: transferred %d, want %d", testName, n, len(data))
+				}
+				switch runtime.GOOS {
+				case "illumos", "solaris":
+					// On SunOS, We rely on File.Stat to get the size of the source file,
+					// which doesn't work for pipe.
+					if hook.called {
+						t.Fatalf("%s: shouldn't have called the hook with a source of pipe", testName)
+					}
+				default:
+					if !hook.called {
+						t.Fatalf("%s: should have called the hook with a source of pipe", testName)
+					}
+				}
+				mustSeekStart(t, dst)
+				mustContainData(t, dst, data)
+			}
+		})
+	})
+	t.Run("Nil", func(t *testing.T) {
+		var nilFile *File
+		anyFile, err := CreateTemp("", "")
+		if err != nil {
+			t.Fatal(err)
+		}
+		defer Remove(anyFile.Name())
+		defer anyFile.Close()
+
+		if _, err := io.Copy(nilFile, nilFile); err != ErrInvalid {
+			t.Errorf("io.Copy(nilFile, nilFile) = %v, want %v", err, ErrInvalid)
+		}
+		if _, err := io.Copy(anyFile, nilFile); err != ErrInvalid {
+			t.Errorf("io.Copy(anyFile, nilFile) = %v, want %v", err, ErrInvalid)
+		}
+		if _, err := io.Copy(nilFile, anyFile); err != ErrInvalid {
+			t.Errorf("io.Copy(nilFile, anyFile) = %v, want %v", err, ErrInvalid)
+		}
+
+		if _, err := nilFile.ReadFrom(nilFile); err != ErrInvalid {
+			t.Errorf("nilFile.ReadFrom(nilFile) = %v, want %v", err, ErrInvalid)
+		}
+		if _, err := anyFile.ReadFrom(nilFile); err != ErrInvalid {
+			t.Errorf("anyFile.ReadFrom(nilFile) = %v, want %v", err, ErrInvalid)
+		}
+		if _, err := nilFile.ReadFrom(anyFile); err != ErrInvalid {
+			t.Errorf("nilFile.ReadFrom(anyFile) = %v, want %v", err, ErrInvalid)
+		}
+	})
+}
+
+func testCopyFile(t *testing.T, dst, src *File, data []byte, hook *copyFileHook, limit int64, testName string) {
+	// If we have a limit, wrap the reader.
+	var (
+		realsrc io.Reader
+		lr      *io.LimitedReader
+	)
+	if limit >= 0 {
+		lr = &io.LimitedReader{N: limit, R: src}
+		realsrc = lr
+		if limit < int64(len(data)) {
+			data = data[:limit]
+		}
+	} else {
+		realsrc = src
+	}
+
+	// Now call ReadFrom (through io.Copy), which will hopefully call
+	// poll.CopyFileRange or poll.SendFile.
+	n, err := io.Copy(dst, realsrc)
+	if err != nil {
+		t.Fatalf("%s: %v", testName, err)
+	}
+
+	// If we didn't have a limit or had a positive limit, we should have called
+	// poll.CopyFileRange or poll.SendFile with the right file descriptor arguments.
+	if limit != 0 && !hook.called {
+		t.Fatalf("%s: never called the hook", testName)
+	}
+	if hook.called && hook.dstfd != int(dst.Fd()) {
+		t.Fatalf("%s: wrong destination file descriptor: got %d, want %d", testName, hook.dstfd, dst.Fd())
+	}
+	if hook.called && hook.srcfd != int(src.Fd()) {
+		t.Fatalf("%s: wrong source file descriptor: got %d, want %d", testName, hook.srcfd, src.Fd())
+	}
+
+	// Check that the offsets after the transfer make sense, that the size
+	// of the transfer was reported correctly, and that the destination
+	// file contains exactly the bytes we expect it to contain.
+	dstoff, err := dst.Seek(0, io.SeekCurrent)
+	if err != nil {
+		t.Fatalf("%s: %v", testName, err)
+	}
+	srcoff, err := src.Seek(0, io.SeekCurrent)
+	if err != nil {
+		t.Fatalf("%s: %v", testName, err)
+	}
+	if dstoff != srcoff {
+		t.Errorf("%s: offsets differ: dstoff = %d, srcoff = %d", testName, dstoff, srcoff)
+	}
+	if dstoff != int64(len(data)) {
+		t.Errorf("%s: dstoff = %d, want %d", testName, dstoff, len(data))
+	}
+	if n != int64(len(data)) {
+		t.Errorf("%s: short ReadFrom: wrote %d bytes, want %d", testName, n, len(data))
+	}
+	mustSeekStart(t, dst)
+	mustContainData(t, dst, data)
+
+	// If we had a limit, check that it was updated.
+	if lr != nil {
+		if want := limit - n; lr.N != want {
+			t.Fatalf("%s: didn't update limit correctly: got %d, want %d", testName, lr.N, want)
+		}
+	}
+}
+
+// mustContainData ensures that the specified file contains exactly the
+// specified data.
+func mustContainData(t *testing.T, f *File, data []byte) {
+	t.Helper()
+
+	got := make([]byte, len(data))
+	if _, err := io.ReadFull(f, got); err != nil {
+		t.Fatal(err)
+	}
+	if !bytes.Equal(got, data) {
+		t.Fatalf("didn't get the same data back from %s", f.Name())
+	}
+	if _, err := f.Read(make([]byte, 1)); err != io.EOF {
+		t.Fatalf("not at EOF")
+	}
+}
+
+func mustSeekStart(t *testing.T, f *File) {
+	if _, err := f.Seek(0, io.SeekStart); err != nil {
+		t.Fatal(err)
+	}
+}
+
+// newCopyFileTest initializes a new test for copying data between files.
+// It creates source and destination files, and populates the source file
+// with random data of the specified size, then rewind it, so it can be
+// consumed by copy_file_range(2) or sendfile(2).
+func newCopyFileTest(t *testing.T, size int64) (dst, src *File, data []byte) {
+	src, data = createTempFile(t, "test-copy-file-src", size)
+
+	dst, err := CreateTemp(t.TempDir(), "test-copy-file-dst")
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(func() { dst.Close() })
+
+	return
+}
+
+type copyFileHook struct {
+	called bool
+	dstfd  int
+	srcfd  int
+
+	written int64
+	handled bool
+	err     error
+}
+
+func createTempFile(tb testing.TB, name string, size int64) (*File, []byte) {
+	f, err := CreateTemp(tb.TempDir(), name)
+	if err != nil {
+		tb.Fatalf("failed to create temporary file: %v", err)
+	}
+	tb.Cleanup(func() {
+		f.Close()
+	})
+
+	randSeed := time.Now().Unix()
+	tb.Logf("random data seed: %d\n", randSeed)
+	prng := rand.New(rand.NewSource(randSeed))
+	data := make([]byte, size)
+	prng.Read(data)
+	if _, err := f.Write(data); err != nil {
+		tb.Fatalf("failed to create and feed the file: %v", err)
+	}
+	if err := f.Sync(); err != nil {
+		tb.Fatalf("failed to save the file: %v", err)
+	}
+	if _, err := f.Seek(0, io.SeekStart); err != nil {
+		tb.Fatalf("failed to rewind the file: %v", err)
+	}
+
+	return f, data
+}
diff --git a/src/os/removeall_at.go b/src/os/removeall_at.go
index cc254e00..f52f6213 100644
--- a/src/os/removeall_at.go
+++ b/src/os/removeall_at.go
@@ -166,20 +166,11 @@ func removeAllFrom(parent *File, base string) error {
 // we are going to (try to) remove the file.
 // The contents of this file are not relevant for test caching.
 func openDirAt(dirfd int, name string) (*File, error) {
-	var r int
-	for {
-		var e error
-		r, e = unix.Openat(dirfd, name, O_RDONLY|syscall.O_CLOEXEC|syscall.O_DIRECTORY|syscall.O_NOFOLLOW, 0)
-		if e == nil {
-			break
-		}
-
-		// See comment in openFileNolog.
-		if e == syscall.EINTR {
-			continue
-		}
-
-		return nil, e
+	r, err := ignoringEINTR2(func() (int, error) {
+		return unix.Openat(dirfd, name, O_RDONLY|syscall.O_CLOEXEC|syscall.O_DIRECTORY|syscall.O_NOFOLLOW, 0)
+	})
+	if err != nil {
+		return nil, err
 	}
 
 	if !supportsCloseOnExec {
diff --git a/src/os/removeall_test.go b/src/os/removeall_test.go
index 6aca9802..474db2ca 100644
--- a/src/os/removeall_test.go
+++ b/src/os/removeall_test.go
@@ -159,40 +159,25 @@ func TestRemoveAllLongPath(t *testing.T) {
 		t.Skip("skipping for not implemented platforms")
 	}
 
-	prevDir, err := Getwd()
-	if err != nil {
-		t.Fatalf("Could not get wd: %s", err)
-	}
+	startPath := t.TempDir()
+	t.Chdir(startPath)
 
-	startPath, err := MkdirTemp("", "TestRemoveAllLongPath-")
-	if err != nil {
-		t.Fatalf("Could not create TempDir: %s", err)
-	}
-	defer RemoveAll(startPath)
-
-	err = Chdir(startPath)
-	if err != nil {
-		t.Fatalf("Could not chdir %s: %s", startPath, err)
-	}
-
-	// Removing paths with over 4096 chars commonly fails
+	// Removing paths with over 4096 chars commonly fails.
+	name := strings.Repeat("a", 100)
 	for i := 0; i < 41; i++ {
-		name := strings.Repeat("a", 100)
-
-		err = Mkdir(name, 0755)
-		if err != nil {
+		if err := Mkdir(name, 0755); err != nil {
 			t.Fatalf("Could not mkdir %s: %s", name, err)
 		}
-
-		err = Chdir(name)
-		if err != nil {
+		if err := Chdir(name); err != nil {
 			t.Fatalf("Could not chdir %s: %s", name, err)
 		}
 	}
 
-	err = Chdir(prevDir)
+	// Chdir out of startPath before attempting to remove it,
+	// otherwise RemoveAll fails on aix, illumos and solaris.
+	err := Chdir(filepath.Join(startPath, ".."))
 	if err != nil {
-		t.Fatalf("Could not chdir %s: %s", prevDir, err)
+		t.Fatalf("Could not chdir: %s", err)
 	}
 
 	err = RemoveAll(startPath)
@@ -202,30 +187,11 @@ func TestRemoveAllLongPath(t *testing.T) {
 }
 
 func TestRemoveAllDot(t *testing.T) {
-	prevDir, err := Getwd()
-	if err != nil {
-		t.Fatalf("Could not get wd: %s", err)
-	}
-	tempDir, err := MkdirTemp("", "TestRemoveAllDot-")
-	if err != nil {
-		t.Fatalf("Could not create TempDir: %s", err)
-	}
-	defer RemoveAll(tempDir)
+	t.Chdir(t.TempDir())
 
-	err = Chdir(tempDir)
-	if err != nil {
-		t.Fatalf("Could not chdir to tempdir: %s", err)
-	}
-
-	err = RemoveAll(".")
-	if err == nil {
+	if err := RemoveAll("."); err == nil {
 		t.Errorf("RemoveAll succeed to remove .")
 	}
-
-	err = Chdir(prevDir)
-	if err != nil {
-		t.Fatalf("Could not chdir %s: %s", prevDir, err)
-	}
 }
 
 func TestRemoveAllDotDot(t *testing.T) {
diff --git a/src/os/root.go b/src/os/root.go
new file mode 100644
index 00000000..f91c0f75
--- /dev/null
+++ b/src/os/root.go
@@ -0,0 +1,323 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package os
+
+import (
+	"errors"
+	"internal/bytealg"
+	"internal/stringslite"
+	"internal/testlog"
+	"io/fs"
+	"runtime"
+	"slices"
+)
+
+// OpenInRoot opens the file name in the directory dir.
+// It is equivalent to OpenRoot(dir) followed by opening the file in the root.
+//
+// OpenInRoot returns an error if any component of the name
+// references a location outside of dir.
+//
+// See [Root] for details and limitations.
+func OpenInRoot(dir, name string) (*File, error) {
+	r, err := OpenRoot(dir)
+	if err != nil {
+		return nil, err
+	}
+	defer r.Close()
+	return r.Open(name)
+}
+
+// Root may be used to only access files within a single directory tree.
+//
+// Methods on Root can only access files and directories beneath a root directory.
+// If any component of a file name passed to a method of Root references a location
+// outside the root, the method returns an error.
+// File names may reference the directory itself (.).
+//
+// Methods on Root will follow symbolic links, but symbolic links may not
+// reference a location outside the root.
+// Symbolic links must not be absolute.
+//
+// Methods on Root do not prohibit traversal of filesystem boundaries,
+// Linux bind mounts, /proc special files, or access to Unix device files.
+//
+// Methods on Root are safe to be used from multiple goroutines simultaneously.
+//
+// On most platforms, creating a Root opens a file descriptor or handle referencing
+// the directory. If the directory is moved, methods on Root reference the original
+// directory in its new location.
+//
+// Root's behavior differs on some platforms:
+//
+//   - When GOOS=windows, file names may not reference Windows reserved device names
+//     such as NUL and COM1.
+//   - When GOOS=js, Root is vulnerable to TOCTOU (time-of-check-time-of-use)
+//     attacks in symlink validation, and cannot ensure that operations will not
+//     escape the root.
+//   - When GOOS=plan9 or GOOS=js, Root does not track directories across renames.
+//     On these platforms, a Root references a directory name, not a file descriptor.
+type Root struct {
+	root *root
+}
+
+const (
+	// Maximum number of symbolic links we will follow when resolving a file in a root.
+	// 8 is __POSIX_SYMLOOP_MAX (the minimum allowed value for SYMLOOP_MAX),
+	// and a common limit.
+	rootMaxSymlinks = 8
+)
+
+// OpenRoot opens the named directory.
+// If there is an error, it will be of type *PathError.
+func OpenRoot(name string) (*Root, error) {
+	testlog.Open(name)
+	return openRootNolog(name)
+}
+
+// Name returns the name of the directory presented to OpenRoot.
+//
+// It is safe to call Name after [Close].
+func (r *Root) Name() string {
+	return r.root.Name()
+}
+
+// Close closes the Root.
+// After Close is called, methods on Root return errors.
+func (r *Root) Close() error {
+	return r.root.Close()
+}
+
+// Open opens the named file in the root for reading.
+// See [Open] for more details.
+func (r *Root) Open(name string) (*File, error) {
+	return r.OpenFile(name, O_RDONLY, 0)
+}
+
+// Create creates or truncates the named file in the root.
+// See [Create] for more details.
+func (r *Root) Create(name string) (*File, error) {
+	return r.OpenFile(name, O_RDWR|O_CREATE|O_TRUNC, 0666)
+}
+
+// OpenFile opens the named file in the root.
+// See [OpenFile] for more details.
+//
+// If perm contains bits other than the nine least-significant bits (0o777),
+// OpenFile returns an error.
+func (r *Root) OpenFile(name string, flag int, perm FileMode) (*File, error) {
+	if perm&0o777 != perm {
+		return nil, &PathError{Op: "openat", Path: name, Err: errors.New("unsupported file mode")}
+	}
+	r.logOpen(name)
+	rf, err := rootOpenFileNolog(r, name, flag, perm)
+	if err != nil {
+		return nil, err
+	}
+	rf.appendMode = flag&O_APPEND != 0
+	return rf, nil
+}
+
+// OpenRoot opens the named directory in the root.
+// If there is an error, it will be of type *PathError.
+func (r *Root) OpenRoot(name string) (*Root, error) {
+	r.logOpen(name)
+	return openRootInRoot(r, name)
+}
+
+// Mkdir creates a new directory in the root
+// with the specified name and permission bits (before umask).
+// See [Mkdir] for more details.
+//
+// If perm contains bits other than the nine least-significant bits (0o777),
+// OpenFile returns an error.
+func (r *Root) Mkdir(name string, perm FileMode) error {
+	if perm&0o777 != perm {
+		return &PathError{Op: "mkdirat", Path: name, Err: errors.New("unsupported file mode")}
+	}
+	return rootMkdir(r, name, perm)
+}
+
+// Remove removes the named file or (empty) directory in the root.
+// See [Remove] for more details.
+func (r *Root) Remove(name string) error {
+	return rootRemove(r, name)
+}
+
+// Stat returns a [FileInfo] describing the named file in the root.
+// See [Stat] for more details.
+func (r *Root) Stat(name string) (FileInfo, error) {
+	r.logStat(name)
+	return rootStat(r, name, false)
+}
+
+// Lstat returns a [FileInfo] describing the named file in the root.
+// If the file is a symbolic link, the returned FileInfo
+// describes the symbolic link.
+// See [Lstat] for more details.
+func (r *Root) Lstat(name string) (FileInfo, error) {
+	r.logStat(name)
+	return rootStat(r, name, true)
+}
+
+func (r *Root) logOpen(name string) {
+	if log := testlog.Logger(); log != nil {
+		// This won't be right if r's name has changed since it was opened,
+		// but it's the best we can do.
+		log.Open(joinPath(r.Name(), name))
+	}
+}
+
+func (r *Root) logStat(name string) {
+	if log := testlog.Logger(); log != nil {
+		// This won't be right if r's name has changed since it was opened,
+		// but it's the best we can do.
+		log.Stat(joinPath(r.Name(), name))
+	}
+}
+
+// splitPathInRoot splits a path into components
+// and joins it with the given prefix and suffix.
+//
+// The path is relative to a Root, and must not be
+// absolute, volume-relative, or "".
+//
+// "." components are removed, except in the last component.
+//
+// Path separators following the last component are preserved.
+func splitPathInRoot(s string, prefix, suffix []string) (_ []string, err error) {
+	if len(s) == 0 {
+		return nil, errors.New("empty path")
+	}
+	if IsPathSeparator(s[0]) {
+		return nil, errPathEscapes
+	}
+
+	if runtime.GOOS == "windows" {
+		// Windows cleans paths before opening them.
+		s, err = rootCleanPath(s, prefix, suffix)
+		if err != nil {
+			return nil, err
+		}
+		prefix = nil
+		suffix = nil
+	}
+
+	parts := append([]string{}, prefix...)
+	i, j := 0, 1
+	for {
+		if j < len(s) && !IsPathSeparator(s[j]) {
+			// Keep looking for the end of this component.
+			j++
+			continue
+		}
+		parts = append(parts, s[i:j])
+		// Advance to the next component, or end of the path.
+		for j < len(s) && IsPathSeparator(s[j]) {
+			j++
+		}
+		if j == len(s) {
+			// If this is the last path component,
+			// preserve any trailing path separators.
+			parts[len(parts)-1] = s[i:]
+			break
+		}
+		if parts[len(parts)-1] == "." {
+			// Remove "." components, except at the end.
+			parts = parts[:len(parts)-1]
+		}
+		i = j
+	}
+	if len(suffix) > 0 && len(parts) > 0 && parts[len(parts)-1] == "." {
+		// Remove a trailing "." component if we're joining to a suffix.
+		parts = parts[:len(parts)-1]
+	}
+	parts = append(parts, suffix...)
+	return parts, nil
+}
+
+// FS returns a file system (an fs.FS) for the tree of files in the root.
+//
+// The result implements [io/fs.StatFS], [io/fs.ReadFileFS] and
+// [io/fs.ReadDirFS].
+func (r *Root) FS() fs.FS {
+	return (*rootFS)(r)
+}
+
+type rootFS Root
+
+func (rfs *rootFS) Open(name string) (fs.File, error) {
+	r := (*Root)(rfs)
+	if !isValidRootFSPath(name) {
+		return nil, &PathError{Op: "open", Path: name, Err: ErrInvalid}
+	}
+	f, err := r.Open(name)
+	if err != nil {
+		return nil, err
+	}
+	return f, nil
+}
+
+func (rfs *rootFS) ReadDir(name string) ([]DirEntry, error) {
+	r := (*Root)(rfs)
+	if !isValidRootFSPath(name) {
+		return nil, &PathError{Op: "readdir", Path: name, Err: ErrInvalid}
+	}
+
+	// This isn't efficient: We just open a regular file and ReadDir it.
+	// Ideally, we would skip creating a *File entirely and operate directly
+	// on the file descriptor, but that will require some extensive reworking
+	// of directory reading in general.
+	//
+	// This suffices for the moment.
+	f, err := r.Open(name)
+	if err != nil {
+		return nil, err
+	}
+	defer f.Close()
+	dirs, err := f.ReadDir(-1)
+	slices.SortFunc(dirs, func(a, b DirEntry) int {
+		return bytealg.CompareString(a.Name(), b.Name())
+	})
+	return dirs, err
+}
+
+func (rfs *rootFS) ReadFile(name string) ([]byte, error) {
+	r := (*Root)(rfs)
+	if !isValidRootFSPath(name) {
+		return nil, &PathError{Op: "readfile", Path: name, Err: ErrInvalid}
+	}
+	f, err := r.Open(name)
+	if err != nil {
+		return nil, err
+	}
+	defer f.Close()
+	return readFileContents(f)
+}
+
+func (rfs *rootFS) Stat(name string) (FileInfo, error) {
+	r := (*Root)(rfs)
+	if !isValidRootFSPath(name) {
+		return nil, &PathError{Op: "stat", Path: name, Err: ErrInvalid}
+	}
+	return r.Stat(name)
+}
+
+// isValidRootFSPath reprots whether name is a valid filename to pass a Root.FS method.
+func isValidRootFSPath(name string) bool {
+	if !fs.ValidPath(name) {
+		return false
+	}
+	if runtime.GOOS == "windows" {
+		// fs.FS paths are /-separated.
+		// On Windows, reject the path if it contains any \ separators.
+		// Other forms of invalid path (for example, "NUL") are handled by
+		// Root's usual file lookup mechanisms.
+		if stringslite.IndexByte(name, '\\') >= 0 {
+			return false
+		}
+	}
+	return true
+}
diff --git a/src/os/root_js.go b/src/os/root_js.go
new file mode 100644
index 00000000..70aa5f9c
--- /dev/null
+++ b/src/os/root_js.go
@@ -0,0 +1,100 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build js && wasm
+
+package os
+
+import (
+	"errors"
+	"slices"
+	"syscall"
+)
+
+// checkPathEscapes reports whether name escapes the root.
+//
+// Due to the lack of openat, checkPathEscapes is subject to TOCTOU races
+// when symlinks change during the resolution process.
+func checkPathEscapes(r *Root, name string) error {
+	return checkPathEscapesInternal(r, name, false)
+}
+
+// checkPathEscapesLstat reports whether name escapes the root.
+// It does not resolve symlinks in the final path component.
+//
+// Due to the lack of openat, checkPathEscapes is subject to TOCTOU races
+// when symlinks change during the resolution process.
+func checkPathEscapesLstat(r *Root, name string) error {
+	return checkPathEscapesInternal(r, name, true)
+}
+
+func checkPathEscapesInternal(r *Root, name string, lstat bool) error {
+	if r.root.closed.Load() {
+		return ErrClosed
+	}
+	parts, err := splitPathInRoot(name, nil, nil)
+	if err != nil {
+		return err
+	}
+
+	i := 0
+	symlinks := 0
+	base := r.root.name
+	for i < len(parts) {
+		if parts[i] == ".." {
+			// Resolve one or more parent ("..") path components.
+			end := i + 1
+			for end < len(parts) && parts[end] == ".." {
+				end++
+			}
+			count := end - i
+			if count > i {
+				return errPathEscapes
+			}
+			parts = slices.Delete(parts, i-count, end)
+			i -= count
+			base = r.root.name
+			for j := range i {
+				base = joinPath(base, parts[j])
+			}
+			continue
+		}
+
+		if lstat && i == len(parts)-1 {
+			break
+		}
+
+		next := joinPath(base, parts[i])
+		fi, err := Lstat(next)
+		if err != nil {
+			if IsNotExist(err) {
+				return nil
+			}
+			return underlyingError(err)
+		}
+		if fi.Mode()&ModeSymlink != 0 {
+			link, err := Readlink(next)
+			if err != nil {
+				return errPathEscapes
+			}
+			symlinks++
+			if symlinks > rootMaxSymlinks {
+				return errors.New("too many symlinks")
+			}
+			newparts, err := splitPathInRoot(link, parts[:i], parts[i+1:])
+			if err != nil {
+				return err
+			}
+			parts = newparts
+			continue
+		}
+		if !fi.IsDir() && i < len(parts)-1 {
+			return syscall.ENOTDIR
+		}
+
+		base = next
+		i++
+	}
+	return nil
+}
diff --git a/src/cmd/vendor/golang.org/x/tools/internal/versions/toolchain_go120.go b/src/os/root_nonwindows.go
similarity index 56%
rename from src/cmd/vendor/golang.org/x/tools/internal/versions/toolchain_go120.go
rename to src/os/root_nonwindows.go
index 1a9efa12..e40ce4d7 100644
--- a/src/cmd/vendor/golang.org/x/tools/internal/versions/toolchain_go120.go
+++ b/src/os/root_nonwindows.go
@@ -2,13 +2,10 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build go1.20
-// +build go1.20
+//go:build !windows
 
-package versions
+package os
 
-func init() {
-	if Compare(toolchain, Go1_20) < 0 {
-		toolchain = Go1_20
-	}
+func rootCleanPath(s string, prefix, suffix []string) (string, error) {
+	return s, nil
 }
diff --git a/src/os/root_noopenat.go b/src/os/root_noopenat.go
new file mode 100644
index 00000000..8be55a02
--- /dev/null
+++ b/src/os/root_noopenat.go
@@ -0,0 +1,116 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build (js && wasm) || plan9
+
+package os
+
+import (
+	"errors"
+	"sync/atomic"
+)
+
+// root implementation for platforms with no openat.
+// Currently plan9 and js.
+type root struct {
+	name   string
+	closed atomic.Bool
+}
+
+// openRootNolog is OpenRoot.
+func openRootNolog(name string) (*Root, error) {
+	r, err := newRoot(name)
+	if err != nil {
+		return nil, &PathError{Op: "open", Path: name, Err: err}
+	}
+	return r, nil
+}
+
+// openRootInRoot is Root.OpenRoot.
+func openRootInRoot(r *Root, name string) (*Root, error) {
+	if err := checkPathEscapes(r, name); err != nil {
+		return nil, &PathError{Op: "openat", Path: name, Err: err}
+	}
+	r, err := newRoot(joinPath(r.root.name, name))
+	if err != nil {
+		return nil, &PathError{Op: "openat", Path: name, Err: err}
+	}
+	return r, nil
+}
+
+// newRoot returns a new Root.
+// If fd is not a directory, it closes it and returns an error.
+func newRoot(name string) (*Root, error) {
+	fi, err := Stat(name)
+	if err != nil {
+		return nil, err.(*PathError).Err
+	}
+	if !fi.IsDir() {
+		return nil, errors.New("not a directory")
+	}
+	return &Root{&root{name: name}}, nil
+}
+
+func (r *root) Close() error {
+	// For consistency with platforms where Root.Close closes a handle,
+	// mark the Root as closed and return errors from future calls.
+	r.closed.Store(true)
+	return nil
+}
+
+func (r *root) Name() string {
+	return r.name
+}
+
+// rootOpenFileNolog is Root.OpenFile.
+func rootOpenFileNolog(r *Root, name string, flag int, perm FileMode) (*File, error) {
+	if err := checkPathEscapes(r, name); err != nil {
+		return nil, &PathError{Op: "openat", Path: name, Err: err}
+	}
+	f, err := openFileNolog(joinPath(r.root.name, name), flag, perm)
+	if err != nil {
+		return nil, &PathError{Op: "openat", Path: name, Err: underlyingError(err)}
+	}
+	return f, nil
+}
+
+func rootStat(r *Root, name string, lstat bool) (FileInfo, error) {
+	var fi FileInfo
+	var err error
+	if lstat {
+		err = checkPathEscapesLstat(r, name)
+		if err == nil {
+			fi, err = Lstat(joinPath(r.root.name, name))
+		}
+	} else {
+		err = checkPathEscapes(r, name)
+		if err == nil {
+			fi, err = Stat(joinPath(r.root.name, name))
+		}
+	}
+	if err != nil {
+		return nil, &PathError{Op: "statat", Path: name, Err: underlyingError(err)}
+	}
+	return fi, nil
+}
+
+func rootMkdir(r *Root, name string, perm FileMode) error {
+	if err := checkPathEscapes(r, name); err != nil {
+		return &PathError{Op: "mkdirat", Path: name, Err: err}
+	}
+	if err := Mkdir(joinPath(r.root.name, name), perm); err != nil {
+		return &PathError{Op: "mkdirat", Path: name, Err: underlyingError(err)}
+	}
+	return nil
+}
+
+func rootRemove(r *Root, name string) error {
+	if err := checkPathEscapesLstat(r, name); err != nil {
+		return &PathError{Op: "removeat", Path: name, Err: err}
+	}
+	if err := Remove(joinPath(r.root.name, name)); err != nil {
+		return &PathError{Op: "removeat", Path: name, Err: underlyingError(err)}
+	}
+	return nil
+}
diff --git a/src/os/root_openat.go b/src/os/root_openat.go
new file mode 100644
index 00000000..a03208b4
--- /dev/null
+++ b/src/os/root_openat.go
@@ -0,0 +1,209 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris || windows || wasip1
+
+package os
+
+import (
+	"runtime"
+	"slices"
+	"sync"
+	"syscall"
+)
+
+// root implementation for platforms with a function to open a file
+// relative to a directory.
+type root struct {
+	name string
+
+	// refs is incremented while an operation is using fd.
+	// closed is set when Close is called.
+	// fd is closed when closed is true and refs is 0.
+	mu     sync.Mutex
+	fd     sysfdType
+	refs   int  // number of active operations
+	closed bool // set when closed
+}
+
+func (r *root) Close() error {
+	r.mu.Lock()
+	defer r.mu.Unlock()
+	if !r.closed && r.refs == 0 {
+		syscall.Close(r.fd)
+	}
+	r.closed = true
+	runtime.SetFinalizer(r, nil) // no need for a finalizer any more
+	return nil
+}
+
+func (r *root) incref() error {
+	r.mu.Lock()
+	defer r.mu.Unlock()
+	if r.closed {
+		return ErrClosed
+	}
+	r.refs++
+	return nil
+}
+
+func (r *root) decref() {
+	r.mu.Lock()
+	defer r.mu.Unlock()
+	if r.refs <= 0 {
+		panic("bad Root refcount")
+	}
+	r.refs--
+	if r.closed && r.refs == 0 {
+		syscall.Close(r.fd)
+	}
+}
+
+func (r *root) Name() string {
+	return r.name
+}
+
+func rootMkdir(r *Root, name string, perm FileMode) error {
+	_, err := doInRoot(r, name, func(parent sysfdType, name string) (struct{}, error) {
+		return struct{}{}, mkdirat(parent, name, perm)
+	})
+	if err != nil {
+		return &PathError{Op: "mkdirat", Path: name, Err: err}
+	}
+	return err
+}
+
+func rootRemove(r *Root, name string) error {
+	_, err := doInRoot(r, name, func(parent sysfdType, name string) (struct{}, error) {
+		return struct{}{}, removeat(parent, name)
+	})
+	if err != nil {
+		return &PathError{Op: "removeat", Path: name, Err: err}
+	}
+	return err
+}
+
+// doInRoot performs an operation on a path in a Root.
+//
+// It opens the directory containing the final element of the path,
+// and calls f with the directory FD and name of the final element.
+//
+// If the path refers to a symlink which should be followed,
+// then f must return errSymlink.
+// doInRoot will follow the symlink and call f again.
+func doInRoot[T any](r *Root, name string, f func(parent sysfdType, name string) (T, error)) (ret T, err error) {
+	if err := r.root.incref(); err != nil {
+		return ret, err
+	}
+	defer r.root.decref()
+
+	parts, err := splitPathInRoot(name, nil, nil)
+	if err != nil {
+		return ret, err
+	}
+
+	rootfd := r.root.fd
+	dirfd := rootfd
+	defer func() {
+		if dirfd != rootfd {
+			syscall.Close(dirfd)
+		}
+	}()
+
+	// When resolving .. path components, we restart path resolution from the root.
+	// (We can't openat(dir, "..") to move up to the parent directory,
+	// because dir may have moved since we opened it.)
+	// To limit how many opens a malicious path can cause us to perform, we set
+	// a limit on the total number of path steps and the total number of restarts
+	// caused by .. components. If *both* limits are exceeded, we halt the operation.
+	const maxSteps = 255
+	const maxRestarts = 8
+
+	i := 0
+	steps := 0
+	restarts := 0
+	symlinks := 0
+	for {
+		steps++
+		if steps > maxSteps && restarts > maxRestarts {
+			return ret, syscall.ENAMETOOLONG
+		}
+
+		if parts[i] == ".." {
+			// Resolve one or more parent ("..") path components.
+			//
+			// Rewrite the original path,
+			// removing the elements eliminated by ".." components,
+			// and start over from the beginning.
+			restarts++
+			end := i + 1
+			for end < len(parts) && parts[end] == ".." {
+				end++
+			}
+			count := end - i
+			if count > i {
+				return ret, errPathEscapes
+			}
+			parts = slices.Delete(parts, i-count, end)
+			i = 0
+			if dirfd != rootfd {
+				syscall.Close(dirfd)
+			}
+			dirfd = rootfd
+			continue
+		}
+
+		if i == len(parts)-1 {
+			// This is the last path element.
+			// Call f to decide what to do with it.
+			// If f returns errSymlink, this element is a symlink
+			// which should be followed.
+			ret, err = f(dirfd, parts[i])
+			if _, ok := err.(errSymlink); !ok {
+				return ret, err
+			}
+		} else {
+			var fd sysfdType
+			fd, err = rootOpenDir(dirfd, parts[i])
+			if err == nil {
+				if dirfd != rootfd {
+					syscall.Close(dirfd)
+				}
+				dirfd = fd
+			} else if _, ok := err.(errSymlink); !ok {
+				return ret, err
+			}
+		}
+
+		if e, ok := err.(errSymlink); ok {
+			symlinks++
+			if symlinks > rootMaxSymlinks {
+				return ret, syscall.ELOOP
+			}
+			newparts, err := splitPathInRoot(string(e), parts[:i], parts[i+1:])
+			if err != nil {
+				return ret, err
+			}
+			if len(newparts) < i || !slices.Equal(parts[:i], newparts[:i]) {
+				// Some component in the path which we have already traversed
+				// has changed. We need to restart parsing from the root.
+				i = 0
+				if dirfd != rootfd {
+					syscall.Close(dirfd)
+				}
+				dirfd = rootfd
+			}
+			parts = newparts
+			continue
+		}
+
+		i++
+	}
+}
+
+// errSymlink reports that a file being operated on is actually a symlink,
+// and the target of that symlink.
+type errSymlink string
+
+func (errSymlink) Error() string { panic("errSymlink is not user-visible") }
diff --git a/src/os/root_plan9.go b/src/os/root_plan9.go
new file mode 100644
index 00000000..08005acc
--- /dev/null
+++ b/src/os/root_plan9.go
@@ -0,0 +1,25 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build plan9
+
+package os
+
+import (
+	"internal/filepathlite"
+)
+
+func checkPathEscapes(r *Root, name string) error {
+	if r.root.closed.Load() {
+		return ErrClosed
+	}
+	if !filepathlite.IsLocal(name) {
+		return errPathEscapes
+	}
+	return nil
+}
+
+func checkPathEscapesLstat(r *Root, name string) error {
+	return checkPathEscapes(r, name)
+}
diff --git a/src/os/root_test.go b/src/os/root_test.go
new file mode 100644
index 00000000..cbb985b2
--- /dev/null
+++ b/src/os/root_test.go
@@ -0,0 +1,1200 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package os_test
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"io"
+	"io/fs"
+	"net"
+	"os"
+	"path"
+	"path/filepath"
+	"runtime"
+	"slices"
+	"strings"
+	"testing"
+	"time"
+)
+
+// testMaybeRooted calls f in two subtests,
+// one with a Root and one with a nil r.
+func testMaybeRooted(t *testing.T, f func(t *testing.T, r *os.Root)) {
+	t.Run("NoRoot", func(t *testing.T) {
+		t.Chdir(t.TempDir())
+		f(t, nil)
+	})
+	t.Run("InRoot", func(t *testing.T) {
+		t.Chdir(t.TempDir())
+		r, err := os.OpenRoot(".")
+		if err != nil {
+			t.Fatal(err)
+		}
+		defer r.Close()
+		f(t, r)
+	})
+}
+
+// makefs creates a test filesystem layout and returns the path to its root.
+//
+// Each entry in the slice is a file, directory, or symbolic link to create:
+//
+//   - "d/": directory d
+//   - "f": file f with contents f
+//   - "a => b": symlink a with target b
+//
+// The directory containing the filesystem is always named ROOT.
+// $ABS is replaced with the absolute path of the directory containing the filesystem.
+//
+// Parent directories are automatically created as needed.
+//
+// makefs calls t.Skip if the layout contains features not supported by the current GOOS.
+func makefs(t *testing.T, fs []string) string {
+	root := path.Join(t.TempDir(), "ROOT")
+	if err := os.Mkdir(root, 0o777); err != nil {
+		t.Fatal(err)
+	}
+	for _, ent := range fs {
+		ent = strings.ReplaceAll(ent, "$ABS", root)
+		base, link, isLink := strings.Cut(ent, " => ")
+		if isLink {
+			if runtime.GOOS == "wasip1" && path.IsAbs(link) {
+				t.Skip("absolute link targets not supported on " + runtime.GOOS)
+			}
+			if runtime.GOOS == "plan9" {
+				t.Skip("symlinks not supported on " + runtime.GOOS)
+			}
+			ent = base
+		}
+		if err := os.MkdirAll(path.Join(root, path.Dir(base)), 0o777); err != nil {
+			t.Fatal(err)
+		}
+		if isLink {
+			if err := os.Symlink(link, path.Join(root, base)); err != nil {
+				t.Fatal(err)
+			}
+		} else if strings.HasSuffix(ent, "/") {
+			if err := os.MkdirAll(path.Join(root, ent), 0o777); err != nil {
+				t.Fatal(err)
+			}
+		} else {
+			if err := os.WriteFile(path.Join(root, ent), []byte(ent), 0o666); err != nil {
+				t.Fatal(err)
+			}
+		}
+	}
+	return root
+}
+
+// A rootTest is a test case for os.Root.
+type rootTest struct {
+	name string
+
+	// fs is the test filesystem layout. See makefs above.
+	fs []string
+
+	// open is the filename to access in the test.
+	open string
+
+	// target is the filename that we expect to be accessed, after resolving all symlinks.
+	// For test cases where the operation fails due to an escaping path such as ../ROOT/x,
+	// the target is the filename that should not have been opened.
+	target string
+
+	// ltarget is the filename that we expect to accessed, after resolving all symlinks
+	// except the last one. This is the file we expect to be removed by Remove or statted
+	// by Lstat.
+	//
+	// If the last path component in open is not a symlink, ltarget should be "".
+	ltarget string
+
+	// wantError is true if accessing the file should fail.
+	wantError bool
+
+	// alwaysFails is true if the open operation is expected to fail
+	// even when using non-openat operations.
+	//
+	// This lets us check that tests that are expected to fail because (for example)
+	// a path escapes the directory root will succeed when the escaping checks are not
+	// performed.
+	alwaysFails bool
+}
+
+// run sets up the test filesystem layout, os.OpenDirs the root, and calls f.
+func (test *rootTest) run(t *testing.T, f func(t *testing.T, target string, d *os.Root)) {
+	t.Run(test.name, func(t *testing.T) {
+		root := makefs(t, test.fs)
+		d, err := os.OpenRoot(root)
+		if err != nil {
+			t.Fatal(err)
+		}
+		defer d.Close()
+		// The target is a file that will be accessed,
+		// or a file that should not be accessed
+		// (because doing so escapes the root).
+		target := test.target
+		if test.target != "" {
+			target = filepath.Join(root, test.target)
+		}
+		f(t, target, d)
+	})
+}
+
+// errEndsTest checks the error result of a test,
+// verifying that it succeeded or failed as expected.
+//
+// It returns true if the test is done due to encountering an expected error.
+// false if the test should continue.
+func errEndsTest(t *testing.T, err error, wantError bool, format string, args ...any) bool {
+	t.Helper()
+	if wantError {
+		if err == nil {
+			op := fmt.Sprintf(format, args...)
+			t.Fatalf("%v = nil; want error", op)
+		}
+		return true
+	} else {
+		if err != nil {
+			op := fmt.Sprintf(format, args...)
+			t.Fatalf("%v = %v; want success", op, err)
+		}
+		return false
+	}
+}
+
+var rootTestCases = []rootTest{{
+	name:   "plain path",
+	fs:     []string{},
+	open:   "target",
+	target: "target",
+}, {
+	name: "path in directory",
+	fs: []string{
+		"a/b/c/",
+	},
+	open:   "a/b/c/target",
+	target: "a/b/c/target",
+}, {
+	name: "symlink",
+	fs: []string{
+		"link => target",
+	},
+	open:    "link",
+	target:  "target",
+	ltarget: "link",
+}, {
+	name: "symlink chain",
+	fs: []string{
+		"link => a/b/c/target",
+		"a/b => e",
+		"a/e => ../f",
+		"f => g/h/i",
+		"g/h/i => ..",
+		"g/c/",
+	},
+	open:    "link",
+	target:  "g/c/target",
+	ltarget: "link",
+}, {
+	name: "path with dot",
+	fs: []string{
+		"a/b/",
+	},
+	open:   "./a/./b/./target",
+	target: "a/b/target",
+}, {
+	name: "path with dotdot",
+	fs: []string{
+		"a/b/",
+	},
+	open:   "a/../a/b/../../a/b/../b/target",
+	target: "a/b/target",
+}, {
+	name: "dotdot no symlink",
+	fs: []string{
+		"a/",
+	},
+	open:   "a/../target",
+	target: "target",
+}, {
+	name: "dotdot after symlink",
+	fs: []string{
+		"a => b/c",
+		"b/c/",
+	},
+	open: "a/../target",
+	target: func() string {
+		if runtime.GOOS == "windows" {
+			// On Windows, the path is cleaned before symlink resolution.
+			return "target"
+		}
+		return "b/target"
+	}(),
+}, {
+	name: "dotdot before symlink",
+	fs: []string{
+		"a => b/c",
+		"b/c/",
+	},
+	open:   "b/../a/target",
+	target: "b/c/target",
+}, {
+	name: "symlink ends in dot",
+	fs: []string{
+		"a => b/.",
+		"b/",
+	},
+	open:   "a/target",
+	target: "b/target",
+}, {
+	name:        "directory does not exist",
+	fs:          []string{},
+	open:        "a/file",
+	wantError:   true,
+	alwaysFails: true,
+}, {
+	name:        "empty path",
+	fs:          []string{},
+	open:        "",
+	wantError:   true,
+	alwaysFails: true,
+}, {
+	name: "symlink cycle",
+	fs: []string{
+		"a => a",
+	},
+	open:        "a",
+	ltarget:     "a",
+	wantError:   true,
+	alwaysFails: true,
+}, {
+	name:      "path escapes",
+	fs:        []string{},
+	open:      "../ROOT/target",
+	target:    "target",
+	wantError: true,
+}, {
+	name: "long path escapes",
+	fs: []string{
+		"a/",
+	},
+	open:      "a/../../ROOT/target",
+	target:    "target",
+	wantError: true,
+}, {
+	name: "absolute symlink",
+	fs: []string{
+		"link => $ABS/target",
+	},
+	open:      "link",
+	ltarget:   "link",
+	target:    "target",
+	wantError: true,
+}, {
+	name: "relative symlink",
+	fs: []string{
+		"link => ../ROOT/target",
+	},
+	open:      "link",
+	target:    "target",
+	ltarget:   "link",
+	wantError: true,
+}, {
+	name: "symlink chain escapes",
+	fs: []string{
+		"link => a/b/c/target",
+		"a/b => e",
+		"a/e => ../../ROOT",
+		"c/",
+	},
+	open:      "link",
+	target:    "c/target",
+	ltarget:   "link",
+	wantError: true,
+}}
+
+func TestRootOpen_File(t *testing.T) {
+	want := []byte("target")
+	for _, test := range rootTestCases {
+		test.run(t, func(t *testing.T, target string, root *os.Root) {
+			if target != "" {
+				if err := os.WriteFile(target, want, 0o666); err != nil {
+					t.Fatal(err)
+				}
+			}
+			f, err := root.Open(test.open)
+			if errEndsTest(t, err, test.wantError, "root.Open(%q)", test.open) {
+				return
+			}
+			defer f.Close()
+			got, err := io.ReadAll(f)
+			if err != nil || !bytes.Equal(got, want) {
+				t.Errorf(`Dir.Open(%q): read content %q, %v; want %q`, test.open, string(got), err, string(want))
+			}
+		})
+	}
+}
+
+func TestRootOpen_Directory(t *testing.T) {
+	for _, test := range rootTestCases {
+		test.run(t, func(t *testing.T, target string, root *os.Root) {
+			if target != "" {
+				if err := os.Mkdir(target, 0o777); err != nil {
+					t.Fatal(err)
+				}
+				if err := os.WriteFile(target+"/found", nil, 0o666); err != nil {
+					t.Fatal(err)
+				}
+			}
+			f, err := root.Open(test.open)
+			if errEndsTest(t, err, test.wantError, "root.Open(%q)", test.open) {
+				return
+			}
+			defer f.Close()
+			got, err := f.Readdirnames(-1)
+			if err != nil {
+				t.Errorf(`Dir.Open(%q).Readdirnames: %v`, test.open, err)
+			}
+			if want := []string{"found"}; !slices.Equal(got, want) {
+				t.Errorf(`Dir.Open(%q).Readdirnames: %q, want %q`, test.open, got, want)
+			}
+		})
+	}
+}
+
+func TestRootCreate(t *testing.T) {
+	want := []byte("target")
+	for _, test := range rootTestCases {
+		test.run(t, func(t *testing.T, target string, root *os.Root) {
+			f, err := root.Create(test.open)
+			if errEndsTest(t, err, test.wantError, "root.Create(%q)", test.open) {
+				return
+			}
+			if _, err := f.Write(want); err != nil {
+				t.Fatal(err)
+			}
+			f.Close()
+			got, err := os.ReadFile(target)
+			if err != nil {
+				t.Fatalf(`reading file created with root.Create(%q): %v`, test.open, err)
+			}
+			if !bytes.Equal(got, want) {
+				t.Fatalf(`reading file created with root.Create(%q): got %q; want %q`, test.open, got, want)
+			}
+		})
+	}
+}
+
+func TestRootMkdir(t *testing.T) {
+	for _, test := range rootTestCases {
+		test.run(t, func(t *testing.T, target string, root *os.Root) {
+			wantError := test.wantError
+			if !wantError {
+				fi, err := os.Lstat(filepath.Join(root.Name(), test.open))
+				if err == nil && fi.Mode().Type() == fs.ModeSymlink {
+					// This case is trying to mkdir("some symlink"),
+					// which is an error.
+					wantError = true
+				}
+			}
+
+			err := root.Mkdir(test.open, 0o777)
+			if errEndsTest(t, err, wantError, "root.Create(%q)", test.open) {
+				return
+			}
+			fi, err := os.Lstat(target)
+			if err != nil {
+				t.Fatalf(`stat file created with Root.Mkdir(%q): %v`, test.open, err)
+			}
+			if !fi.IsDir() {
+				t.Fatalf(`stat file created with Root.Mkdir(%q): not a directory`, test.open)
+			}
+		})
+	}
+}
+
+func TestRootOpenRoot(t *testing.T) {
+	for _, test := range rootTestCases {
+		test.run(t, func(t *testing.T, target string, root *os.Root) {
+			if target != "" {
+				if err := os.Mkdir(target, 0o777); err != nil {
+					t.Fatal(err)
+				}
+				if err := os.WriteFile(target+"/f", nil, 0o666); err != nil {
+					t.Fatal(err)
+				}
+			}
+			rr, err := root.OpenRoot(test.open)
+			if errEndsTest(t, err, test.wantError, "root.OpenRoot(%q)", test.open) {
+				return
+			}
+			defer rr.Close()
+			f, err := rr.Open("f")
+			if err != nil {
+				t.Fatalf(`root.OpenRoot(%q).Open("f") = %v`, test.open, err)
+			}
+			f.Close()
+		})
+	}
+}
+
+func TestRootRemoveFile(t *testing.T) {
+	for _, test := range rootTestCases {
+		test.run(t, func(t *testing.T, target string, root *os.Root) {
+			wantError := test.wantError
+			if test.ltarget != "" {
+				// Remove doesn't follow symlinks in the final path component,
+				// so it will successfully remove ltarget.
+				wantError = false
+				target = filepath.Join(root.Name(), test.ltarget)
+			} else if target != "" {
+				if err := os.WriteFile(target, nil, 0o666); err != nil {
+					t.Fatal(err)
+				}
+			}
+
+			err := root.Remove(test.open)
+			if errEndsTest(t, err, wantError, "root.Remove(%q)", test.open) {
+				return
+			}
+			_, err = os.Lstat(target)
+			if !errors.Is(err, os.ErrNotExist) {
+				t.Fatalf(`stat file removed with Root.Remove(%q): %v, want ErrNotExist`, test.open, err)
+			}
+		})
+	}
+}
+
+func TestRootRemoveDirectory(t *testing.T) {
+	for _, test := range rootTestCases {
+		test.run(t, func(t *testing.T, target string, root *os.Root) {
+			wantError := test.wantError
+			if test.ltarget != "" {
+				// Remove doesn't follow symlinks in the final path component,
+				// so it will successfully remove ltarget.
+				wantError = false
+				target = filepath.Join(root.Name(), test.ltarget)
+			} else if target != "" {
+				if err := os.Mkdir(target, 0o777); err != nil {
+					t.Fatal(err)
+				}
+			}
+
+			err := root.Remove(test.open)
+			if errEndsTest(t, err, wantError, "root.Remove(%q)", test.open) {
+				return
+			}
+			_, err = os.Lstat(target)
+			if !errors.Is(err, os.ErrNotExist) {
+				t.Fatalf(`stat file removed with Root.Remove(%q): %v, want ErrNotExist`, test.open, err)
+			}
+		})
+	}
+}
+
+func TestRootOpenFileAsRoot(t *testing.T) {
+	dir := t.TempDir()
+	target := filepath.Join(dir, "target")
+	if err := os.WriteFile(target, nil, 0o666); err != nil {
+		t.Fatal(err)
+	}
+	_, err := os.OpenRoot(target)
+	if err == nil {
+		t.Fatal("os.OpenRoot(file) succeeded; want failure")
+	}
+	r, err := os.OpenRoot(dir)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer r.Close()
+	_, err = r.OpenRoot("target")
+	if err == nil {
+		t.Fatal("Root.OpenRoot(file) succeeded; want failure")
+	}
+}
+
+func TestRootStat(t *testing.T) {
+	for _, test := range rootTestCases {
+		test.run(t, func(t *testing.T, target string, root *os.Root) {
+			const content = "content"
+			if target != "" {
+				if err := os.WriteFile(target, []byte(content), 0o666); err != nil {
+					t.Fatal(err)
+				}
+			}
+
+			fi, err := root.Stat(test.open)
+			if errEndsTest(t, err, test.wantError, "root.Stat(%q)", test.open) {
+				return
+			}
+			if got, want := fi.Name(), filepath.Base(test.open); got != want {
+				t.Errorf("root.Stat(%q).Name() = %q, want %q", test.open, got, want)
+			}
+			if got, want := fi.Size(), int64(len(content)); got != want {
+				t.Errorf("root.Stat(%q).Size() = %v, want %v", test.open, got, want)
+			}
+		})
+	}
+}
+
+func TestRootLstat(t *testing.T) {
+	for _, test := range rootTestCases {
+		test.run(t, func(t *testing.T, target string, root *os.Root) {
+			const content = "content"
+			wantError := test.wantError
+			if test.ltarget != "" {
+				// Lstat will stat the final link, rather than following it.
+				wantError = false
+			} else if target != "" {
+				if err := os.WriteFile(target, []byte(content), 0o666); err != nil {
+					t.Fatal(err)
+				}
+			}
+
+			fi, err := root.Lstat(test.open)
+			if errEndsTest(t, err, wantError, "root.Stat(%q)", test.open) {
+				return
+			}
+			if got, want := fi.Name(), filepath.Base(test.open); got != want {
+				t.Errorf("root.Stat(%q).Name() = %q, want %q", test.open, got, want)
+			}
+			if test.ltarget == "" {
+				if got := fi.Mode(); got&os.ModeSymlink != 0 {
+					t.Errorf("root.Stat(%q).Mode() = %v, want non-symlink", test.open, got)
+				}
+				if got, want := fi.Size(), int64(len(content)); got != want {
+					t.Errorf("root.Stat(%q).Size() = %v, want %v", test.open, got, want)
+				}
+			} else {
+				if got := fi.Mode(); got&os.ModeSymlink == 0 {
+					t.Errorf("root.Stat(%q).Mode() = %v, want symlink", test.open, got)
+				}
+			}
+		})
+	}
+}
+
+// A rootConsistencyTest is a test case comparing os.Root behavior with
+// the corresponding non-Root function.
+//
+// These tests verify that, for example, Root.Open("file/./") and os.Open("file/./")
+// have the same result, although the specific result may vary by platform.
+type rootConsistencyTest struct {
+	name string
+
+	// fs is the test filesystem layout. See makefs above.
+	// fsFunc is called to modify the test filesystem, or replace it.
+	fs     []string
+	fsFunc func(t *testing.T, dir string) string
+
+	// open is the filename to access in the test.
+	open string
+
+	// detailedErrorMismatch indicates that os.Root and the corresponding non-Root
+	// function return different errors for this test.
+	detailedErrorMismatch func(t *testing.T) bool
+}
+
+var rootConsistencyTestCases = []rootConsistencyTest{{
+	name: "file",
+	fs: []string{
+		"target",
+	},
+	open: "target",
+}, {
+	name: "dir slash dot",
+	fs: []string{
+		"target/file",
+	},
+	open: "target/.",
+}, {
+	name: "dot",
+	fs: []string{
+		"file",
+	},
+	open: ".",
+}, {
+	name: "file slash dot",
+	fs: []string{
+		"target",
+	},
+	open: "target/.",
+	detailedErrorMismatch: func(t *testing.T) bool {
+		// FreeBSD returns EPERM in the non-Root case.
+		return runtime.GOOS == "freebsd" && strings.HasPrefix(t.Name(), "TestRootConsistencyRemove")
+	},
+}, {
+	name: "dir slash",
+	fs: []string{
+		"target/file",
+	},
+	open: "target/",
+}, {
+	name: "dot slash",
+	fs: []string{
+		"file",
+	},
+	open: "./",
+}, {
+	name: "file slash",
+	fs: []string{
+		"target",
+	},
+	open: "target/",
+	detailedErrorMismatch: func(t *testing.T) bool {
+		// os.Create returns ENOTDIR or EISDIR depending on the platform.
+		return runtime.GOOS == "js"
+	},
+}, {
+	name: "file in path",
+	fs: []string{
+		"file",
+	},
+	open: "file/target",
+}, {
+	name: "directory in path missing",
+	open: "dir/target",
+}, {
+	name: "target does not exist",
+	open: "target",
+}, {
+	name: "symlink slash",
+	fs: []string{
+		"target/file",
+		"link => target",
+	},
+	open: "link/",
+}, {
+	name: "symlink slash dot",
+	fs: []string{
+		"target/file",
+		"link => target",
+	},
+	open: "link/.",
+}, {
+	name: "file symlink slash",
+	fs: []string{
+		"target",
+		"link => target",
+	},
+	open: "link/",
+	detailedErrorMismatch: func(t *testing.T) bool {
+		// os.Create returns ENOTDIR or EISDIR depending on the platform.
+		return runtime.GOOS == "js"
+	},
+}, {
+	name: "unresolved symlink",
+	fs: []string{
+		"link => target",
+	},
+	open: "link",
+}, {
+	name: "resolved symlink",
+	fs: []string{
+		"link => target",
+		"target",
+	},
+	open: "link",
+}, {
+	name: "dotdot in path after symlink",
+	fs: []string{
+		"a => b/c",
+		"b/c/",
+		"b/target",
+	},
+	open: "a/../target",
+}, {
+	name: "long file name",
+	open: strings.Repeat("a", 500),
+}, {
+	name: "unreadable directory",
+	fs: []string{
+		"dir/target",
+	},
+	fsFunc: func(t *testing.T, dir string) string {
+		os.Chmod(filepath.Join(dir, "dir"), 0)
+		t.Cleanup(func() {
+			os.Chmod(filepath.Join(dir, "dir"), 0o700)
+		})
+		return dir
+	},
+	open: "dir/target",
+}, {
+	name: "unix domain socket target",
+	fsFunc: func(t *testing.T, dir string) string {
+		return tempDirWithUnixSocket(t, "a")
+	},
+	open: "a",
+}, {
+	name: "unix domain socket in path",
+	fsFunc: func(t *testing.T, dir string) string {
+		return tempDirWithUnixSocket(t, "a")
+	},
+	open: "a/b",
+	detailedErrorMismatch: func(t *testing.T) bool {
+		// On Windows, os.Root.Open returns "The directory name is invalid."
+		// and os.Open returns "The file cannot be accessed by the system.".
+		return runtime.GOOS == "windows"
+	},
+}, {
+	name: "question mark",
+	open: "?",
+}, {
+	name: "nul byte",
+	open: "\x00",
+}}
+
+func tempDirWithUnixSocket(t *testing.T, name string) string {
+	dir, err := os.MkdirTemp("", "")
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(func() {
+		if err := os.RemoveAll(dir); err != nil {
+			t.Error(err)
+		}
+	})
+	addr, err := net.ResolveUnixAddr("unix", filepath.Join(dir, name))
+	if err != nil {
+		t.Skipf("net.ResolveUnixAddr: %v", err)
+	}
+	conn, err := net.ListenUnix("unix", addr)
+	if err != nil {
+		t.Skipf("net.ListenUnix: %v", err)
+	}
+	t.Cleanup(func() {
+		conn.Close()
+	})
+	return dir
+}
+
+func (test rootConsistencyTest) run(t *testing.T, f func(t *testing.T, path string, r *os.Root) (string, error)) {
+	if runtime.GOOS == "wasip1" {
+		// On wasip, non-Root functions clean paths before opening them,
+		// resulting in inconsistent behavior.
+		// https://go.dev/issue/69509
+		t.Skip("#69509: inconsistent results on wasip1")
+	}
+
+	t.Run(test.name, func(t *testing.T) {
+		dir1 := makefs(t, test.fs)
+		dir2 := makefs(t, test.fs)
+		if test.fsFunc != nil {
+			dir1 = test.fsFunc(t, dir1)
+			dir2 = test.fsFunc(t, dir2)
+		}
+
+		r, err := os.OpenRoot(dir1)
+		if err != nil {
+			t.Fatal(err)
+		}
+		defer r.Close()
+
+		res1, err1 := f(t, test.open, r)
+		res2, err2 := f(t, dir2+"/"+test.open, nil)
+
+		if res1 != res2 || ((err1 == nil) != (err2 == nil)) {
+			t.Errorf("with root:    res=%v", res1)
+			t.Errorf("              err=%v", err1)
+			t.Errorf("without root: res=%v", res2)
+			t.Errorf("              err=%v", err2)
+			t.Errorf("want consistent results, got mismatch")
+		}
+
+		if err1 != nil || err2 != nil {
+			e1, ok := err1.(*os.PathError)
+			if !ok {
+				t.Fatalf("with root, expected PathError; got: %v", err1)
+			}
+			e2, ok := err2.(*os.PathError)
+			if !ok {
+				t.Fatalf("without root, expected PathError; got: %v", err1)
+			}
+			detailedErrorMismatch := false
+			if f := test.detailedErrorMismatch; f != nil {
+				detailedErrorMismatch = f(t)
+			}
+			if runtime.GOOS == "plan9" {
+				// Plan9 syscall errors aren't comparable.
+				detailedErrorMismatch = true
+			}
+			if !detailedErrorMismatch && e1.Err != e2.Err {
+				t.Errorf("with root:    err=%v", e1.Err)
+				t.Errorf("without root: err=%v", e2.Err)
+				t.Errorf("want consistent results, got mismatch")
+			}
+		}
+	})
+}
+
+func TestRootConsistencyOpen(t *testing.T) {
+	for _, test := range rootConsistencyTestCases {
+		test.run(t, func(t *testing.T, path string, r *os.Root) (string, error) {
+			var f *os.File
+			var err error
+			if r == nil {
+				f, err = os.Open(path)
+			} else {
+				f, err = r.Open(path)
+			}
+			if err != nil {
+				return "", err
+			}
+			defer f.Close()
+			fi, err := f.Stat()
+			if err == nil && !fi.IsDir() {
+				b, err := io.ReadAll(f)
+				return string(b), err
+			} else {
+				names, err := f.Readdirnames(-1)
+				slices.Sort(names)
+				return fmt.Sprintf("%q", names), err
+			}
+		})
+	}
+}
+
+func TestRootConsistencyCreate(t *testing.T) {
+	for _, test := range rootConsistencyTestCases {
+		test.run(t, func(t *testing.T, path string, r *os.Root) (string, error) {
+			var f *os.File
+			var err error
+			if r == nil {
+				f, err = os.Create(path)
+			} else {
+				f, err = r.Create(path)
+			}
+			if err == nil {
+				f.Write([]byte("file contents"))
+				f.Close()
+			}
+			return "", err
+		})
+	}
+}
+
+func TestRootConsistencyMkdir(t *testing.T) {
+	for _, test := range rootConsistencyTestCases {
+		test.run(t, func(t *testing.T, path string, r *os.Root) (string, error) {
+			var err error
+			if r == nil {
+				err = os.Mkdir(path, 0o777)
+			} else {
+				err = r.Mkdir(path, 0o777)
+			}
+			return "", err
+		})
+	}
+}
+
+func TestRootConsistencyRemove(t *testing.T) {
+	for _, test := range rootConsistencyTestCases {
+		if test.open == "." || test.open == "./" {
+			continue // can't remove the root itself
+		}
+		test.run(t, func(t *testing.T, path string, r *os.Root) (string, error) {
+			var err error
+			if r == nil {
+				err = os.Remove(path)
+			} else {
+				err = r.Remove(path)
+			}
+			return "", err
+		})
+	}
+}
+
+func TestRootConsistencyStat(t *testing.T) {
+	for _, test := range rootConsistencyTestCases {
+		test.run(t, func(t *testing.T, path string, r *os.Root) (string, error) {
+			var fi os.FileInfo
+			var err error
+			if r == nil {
+				fi, err = os.Stat(path)
+			} else {
+				fi, err = r.Stat(path)
+			}
+			if err != nil {
+				return "", err
+			}
+			return fmt.Sprintf("name:%q size:%v mode:%v isdir:%v", fi.Name(), fi.Size(), fi.Mode(), fi.IsDir()), nil
+		})
+	}
+}
+
+func TestRootConsistencyLstat(t *testing.T) {
+	for _, test := range rootConsistencyTestCases {
+		test.run(t, func(t *testing.T, path string, r *os.Root) (string, error) {
+			var fi os.FileInfo
+			var err error
+			if r == nil {
+				fi, err = os.Lstat(path)
+			} else {
+				fi, err = r.Lstat(path)
+			}
+			if err != nil {
+				return "", err
+			}
+			return fmt.Sprintf("name:%q size:%v mode:%v isdir:%v", fi.Name(), fi.Size(), fi.Mode(), fi.IsDir()), nil
+		})
+	}
+}
+
+func TestRootRenameAfterOpen(t *testing.T) {
+	switch runtime.GOOS {
+	case "windows":
+		t.Skip("renaming open files not supported on " + runtime.GOOS)
+	case "js", "plan9":
+		t.Skip("openat not supported on " + runtime.GOOS)
+	case "wasip1":
+		if os.Getenv("GOWASIRUNTIME") == "wazero" {
+			t.Skip("wazero does not track renamed directories")
+		}
+	}
+
+	dir := t.TempDir()
+
+	// Create directory "a" and open it.
+	if err := os.Mkdir(filepath.Join(dir, "a"), 0o777); err != nil {
+		t.Fatal(err)
+	}
+	dirf, err := os.OpenRoot(filepath.Join(dir, "a"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer dirf.Close()
+
+	// Rename "a" => "b", and create "b/f".
+	if err := os.Rename(filepath.Join(dir, "a"), filepath.Join(dir, "b")); err != nil {
+		t.Fatal(err)
+	}
+	if err := os.WriteFile(filepath.Join(dir, "b/f"), []byte("hello"), 0o666); err != nil {
+		t.Fatal(err)
+	}
+
+	// Open "f", and confirm that we see it.
+	f, err := dirf.OpenFile("f", os.O_RDONLY, 0)
+	if err != nil {
+		t.Fatalf("reading file after renaming parent: %v", err)
+	}
+	defer f.Close()
+	b, err := io.ReadAll(f)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if got, want := string(b), "hello"; got != want {
+		t.Fatalf("file contents: %q, want %q", got, want)
+	}
+
+	// f.Name reflects the original path we opened the directory under (".../a"), not "b".
+	if got, want := f.Name(), dirf.Name()+string(os.PathSeparator)+"f"; got != want {
+		t.Errorf("f.Name() = %q, want %q", got, want)
+	}
+}
+
+func TestRootNonPermissionMode(t *testing.T) {
+	r, err := os.OpenRoot(t.TempDir())
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer r.Close()
+	if _, err := r.OpenFile("file", os.O_RDWR|os.O_CREATE, 0o1777); err == nil {
+		t.Errorf("r.OpenFile(file, O_RDWR|O_CREATE, 0o1777) succeeded; want error")
+	}
+	if err := r.Mkdir("file", 0o1777); err == nil {
+		t.Errorf("r.Mkdir(file, 0o1777) succeeded; want error")
+	}
+}
+
+func TestRootUseAfterClose(t *testing.T) {
+	r, err := os.OpenRoot(t.TempDir())
+	if err != nil {
+		t.Fatal(err)
+	}
+	r.Close()
+	for _, test := range []struct {
+		name string
+		f    func(r *os.Root, filename string) error
+	}{{
+		name: "Open",
+		f: func(r *os.Root, filename string) error {
+			_, err := r.Open(filename)
+			return err
+		},
+	}, {
+		name: "Create",
+		f: func(r *os.Root, filename string) error {
+			_, err := r.Create(filename)
+			return err
+		},
+	}, {
+		name: "OpenFile",
+		f: func(r *os.Root, filename string) error {
+			_, err := r.OpenFile(filename, os.O_RDWR, 0o666)
+			return err
+		},
+	}, {
+		name: "OpenRoot",
+		f: func(r *os.Root, filename string) error {
+			_, err := r.OpenRoot(filename)
+			return err
+		},
+	}, {
+		name: "Mkdir",
+		f: func(r *os.Root, filename string) error {
+			return r.Mkdir(filename, 0o777)
+		},
+	}} {
+		err := test.f(r, "target")
+		pe, ok := err.(*os.PathError)
+		if !ok || pe.Path != "target" || pe.Err != os.ErrClosed {
+			t.Errorf(`r.%v = %v; want &PathError{Path: "target", Err: ErrClosed}`, test.name, err)
+		}
+	}
+}
+
+func TestRootConcurrentClose(t *testing.T) {
+	r, err := os.OpenRoot(t.TempDir())
+	if err != nil {
+		t.Fatal(err)
+	}
+	ch := make(chan error, 1)
+	go func() {
+		defer close(ch)
+		first := true
+		for {
+			f, err := r.OpenFile("file", os.O_RDWR|os.O_CREATE, 0o666)
+			if err != nil {
+				ch <- err
+				return
+			}
+			if first {
+				ch <- nil
+				first = false
+			}
+			f.Close()
+			if runtime.GOARCH == "wasm" {
+				// TODO(go.dev/issue/71134) can lead to goroutine starvation.
+				runtime.Gosched()
+			}
+		}
+	}()
+	if err := <-ch; err != nil {
+		t.Errorf("OpenFile: %v, want success", err)
+	}
+	r.Close()
+	if err := <-ch; !errors.Is(err, os.ErrClosed) {
+		t.Errorf("OpenFile: %v, want ErrClosed", err)
+	}
+}
+
+// TestRootRaceRenameDir attempts to escape a Root by renaming a path component mid-parse.
+//
+// We create a deeply nested directory:
+//
+//	base/a/a/a/a/ [...] /a
+//
+// And a path that descends into the tree, then returns to the top using ..:
+//
+//	base/a/a/a/a/ [...] /a/../../../ [..] /../a/f
+//
+// While opening this file, we rename base/a/a to base/b.
+// A naive lookup operation will resolve the path to base/f.
+func TestRootRaceRenameDir(t *testing.T) {
+	dir := t.TempDir()
+	r, err := os.OpenRoot(dir)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer r.Close()
+
+	const depth = 4
+
+	os.MkdirAll(dir+"/base/"+strings.Repeat("/a", depth), 0o777)
+
+	path := "base/" + strings.Repeat("a/", depth) + strings.Repeat("../", depth) + "a/f"
+	os.WriteFile(dir+"/f", []byte("secret"), 0o666)
+	os.WriteFile(dir+"/base/a/f", []byte("public"), 0o666)
+
+	// Compute how long it takes to open the path in the common case.
+	const tries = 10
+	var total time.Duration
+	for range tries {
+		start := time.Now()
+		f, err := r.Open(path)
+		if err != nil {
+			t.Fatal(err)
+		}
+		b, err := io.ReadAll(f)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if string(b) != "public" {
+			t.Fatalf("read %q, want %q", b, "public")
+		}
+		f.Close()
+		total += time.Since(start)
+	}
+	avg := total / tries
+
+	// We're trying to exploit a race, so try this a number of times.
+	for range 100 {
+		// Start a goroutine to open the file.
+		gotc := make(chan []byte)
+		go func() {
+			f, err := r.Open(path)
+			if err != nil {
+				gotc <- nil
+			}
+			defer f.Close()
+			b, _ := io.ReadAll(f)
+			gotc <- b
+		}()
+
+		// Wait for the open operation to partially complete,
+		// and then rename a directory near the root.
+		time.Sleep(avg / 4)
+		if err := os.Rename(dir+"/base/a", dir+"/b"); err != nil {
+			// Windows and Plan9 won't let us rename a directory if we have
+			// an open handle for it, so an error here is expected.
+			switch runtime.GOOS {
+			case "windows", "plan9":
+			default:
+				t.Fatal(err)
+			}
+		}
+
+		got := <-gotc
+		os.Rename(dir+"/b", dir+"/base/a")
+		if len(got) > 0 && string(got) != "public" {
+			t.Errorf("read file: %q; want error or 'public'", got)
+		}
+	}
+}
+
+func TestOpenInRoot(t *testing.T) {
+	dir := makefs(t, []string{
+		"file",
+		"link => ../ROOT/file",
+	})
+	f, err := os.OpenInRoot(dir, "file")
+	if err != nil {
+		t.Fatalf("OpenInRoot(`file`) = %v, want success", err)
+	}
+	f.Close()
+	for _, name := range []string{
+		"link",
+		"../ROOT/file",
+		dir + "/file",
+	} {
+		f, err := os.OpenInRoot(dir, name)
+		if err == nil {
+			f.Close()
+			t.Fatalf("OpenInRoot(%q) = nil, want error", name)
+		}
+	}
+}
diff --git a/src/os/root_unix.go b/src/os/root_unix.go
new file mode 100644
index 00000000..02d3b4bd
--- /dev/null
+++ b/src/os/root_unix.go
@@ -0,0 +1,198 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris || wasip1
+
+package os
+
+import (
+	"errors"
+	"internal/syscall/unix"
+	"runtime"
+	"syscall"
+)
+
+type sysfdType = int
+
+// openRootNolog is OpenRoot.
+func openRootNolog(name string) (*Root, error) {
+	var fd int
+	err := ignoringEINTR(func() error {
+		var err error
+		fd, _, err = open(name, syscall.O_CLOEXEC, 0)
+		return err
+	})
+	if err != nil {
+		return nil, &PathError{Op: "open", Path: name, Err: err}
+	}
+	return newRoot(fd, name)
+}
+
+// newRoot returns a new Root.
+// If fd is not a directory, it closes it and returns an error.
+func newRoot(fd int, name string) (*Root, error) {
+	var fs fileStat
+	err := ignoringEINTR(func() error {
+		return syscall.Fstat(fd, &fs.sys)
+	})
+	fillFileStatFromSys(&fs, name)
+	if err == nil && !fs.IsDir() {
+		syscall.Close(fd)
+		return nil, &PathError{Op: "open", Path: name, Err: errors.New("not a directory")}
+	}
+
+	// There's a race here with fork/exec, which we are
+	// content to live with. See ../syscall/exec_unix.go.
+	if !supportsCloseOnExec {
+		syscall.CloseOnExec(fd)
+	}
+
+	r := &Root{&root{
+		fd:   fd,
+		name: name,
+	}}
+	runtime.SetFinalizer(r.root, (*root).Close)
+	return r, nil
+}
+
+// openRootInRoot is Root.OpenRoot.
+func openRootInRoot(r *Root, name string) (*Root, error) {
+	fd, err := doInRoot(r, name, func(parent int, name string) (fd int, err error) {
+		ignoringEINTR(func() error {
+			fd, err = unix.Openat(parent, name, syscall.O_NOFOLLOW|syscall.O_CLOEXEC, 0)
+			if isNoFollowErr(err) {
+				err = checkSymlink(parent, name, err)
+			}
+			return err
+		})
+		return fd, err
+	})
+	if err != nil {
+		return nil, &PathError{Op: "openat", Path: name, Err: err}
+	}
+	return newRoot(fd, name)
+}
+
+// rootOpenFileNolog is Root.OpenFile.
+func rootOpenFileNolog(root *Root, name string, flag int, perm FileMode) (*File, error) {
+	fd, err := doInRoot(root, name, func(parent int, name string) (fd int, err error) {
+		ignoringEINTR(func() error {
+			fd, err = unix.Openat(parent, name, syscall.O_NOFOLLOW|syscall.O_CLOEXEC|flag, uint32(perm))
+			if isNoFollowErr(err) || err == syscall.ENOTDIR {
+				err = checkSymlink(parent, name, err)
+			}
+			return err
+		})
+		return fd, err
+	})
+	if err != nil {
+		return nil, &PathError{Op: "openat", Path: name, Err: err}
+	}
+	f := newFile(fd, joinPath(root.Name(), name), kindOpenFile, unix.HasNonblockFlag(flag))
+	return f, nil
+}
+
+func rootOpenDir(parent int, name string) (int, error) {
+	var (
+		fd  int
+		err error
+	)
+	ignoringEINTR(func() error {
+		fd, err = unix.Openat(parent, name, syscall.O_NOFOLLOW|syscall.O_CLOEXEC|syscall.O_DIRECTORY, 0)
+		if isNoFollowErr(err) || err == syscall.ENOTDIR {
+			err = checkSymlink(parent, name, err)
+		} else if err == syscall.ENOTSUP || err == syscall.EOPNOTSUPP {
+			// ENOTSUP and EOPNOTSUPP are often, but not always, the same errno.
+			// Translate both to ENOTDIR, since this indicates a non-terminal
+			// path component was not a directory.
+			err = syscall.ENOTDIR
+		}
+		return err
+	})
+	return fd, err
+}
+
+func rootStat(r *Root, name string, lstat bool) (FileInfo, error) {
+	fi, err := doInRoot(r, name, func(parent sysfdType, n string) (FileInfo, error) {
+		var fs fileStat
+		if err := unix.Fstatat(parent, n, &fs.sys, unix.AT_SYMLINK_NOFOLLOW); err != nil {
+			return nil, err
+		}
+		fillFileStatFromSys(&fs, name)
+		if !lstat && fs.Mode()&ModeSymlink != 0 {
+			return nil, checkSymlink(parent, n, syscall.ELOOP)
+		}
+		return &fs, nil
+	})
+	if err != nil {
+		return nil, &PathError{Op: "statat", Path: name, Err: err}
+	}
+	return fi, nil
+}
+
+func mkdirat(fd int, name string, perm FileMode) error {
+	return ignoringEINTR(func() error {
+		return unix.Mkdirat(fd, name, syscallMode(perm))
+	})
+}
+
+func removeat(fd int, name string) error {
+	// The system call interface forces us to know whether
+	// we are removing a file or directory. Try both.
+	e := ignoringEINTR(func() error {
+		return unix.Unlinkat(fd, name, 0)
+	})
+	if e == nil {
+		return nil
+	}
+	e1 := ignoringEINTR(func() error {
+		return unix.Unlinkat(fd, name, unix.AT_REMOVEDIR)
+	})
+	if e1 == nil {
+		return nil
+	}
+	// Both failed. See comment in Remove for how we decide which error to return.
+	if e1 != syscall.ENOTDIR {
+		return e1
+	}
+	return e
+}
+
+// checkSymlink resolves the symlink name in parent,
+// and returns errSymlink with the link contents.
+//
+// If name is not a symlink, return origError.
+func checkSymlink(parent int, name string, origError error) error {
+	link, err := readlinkat(parent, name)
+	if err != nil {
+		return origError
+	}
+	return errSymlink(link)
+}
+
+func readlinkat(fd int, name string) (string, error) {
+	for len := 128; ; len *= 2 {
+		b := make([]byte, len)
+		var (
+			n int
+			e error
+		)
+		ignoringEINTR(func() error {
+			n, e = unix.Readlinkat(fd, name, b)
+			return e
+		})
+		if e == syscall.ERANGE {
+			continue
+		}
+		if e != nil {
+			return "", e
+		}
+		if n < 0 {
+			n = 0
+		}
+		if n < len {
+			return string(b[0:n]), nil
+		}
+	}
+}
diff --git a/src/os/root_windows.go b/src/os/root_windows.go
new file mode 100644
index 00000000..32dfa070
--- /dev/null
+++ b/src/os/root_windows.go
@@ -0,0 +1,241 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build windows
+
+package os
+
+import (
+	"errors"
+	"internal/filepathlite"
+	"internal/stringslite"
+	"internal/syscall/windows"
+	"runtime"
+	"syscall"
+	"unsafe"
+)
+
+// rootCleanPath uses GetFullPathName to perform lexical path cleaning.
+//
+// On Windows, file names are lexically cleaned at the start of a file operation.
+// For example, on Windows the path `a\..\b` is exactly equivalent to `b` alone,
+// even if `a` does not exist or is not a directory.
+//
+// We use the Windows API function GetFullPathName to perform this cleaning.
+// We could do this ourselves, but there are a number of subtle behaviors here,
+// and deferring to the OS maintains consistency.
+// (For example, `a\.\` cleans to `a\`.)
+//
+// GetFullPathName operates on absolute paths, and our input path is relative.
+// We make the path absolute by prepending a fixed prefix of \\?\?\.
+//
+// We want to detect paths which use .. components to escape the root.
+// We do this by ensuring the cleaned path still begins with \\?\?\.
+// We catch the corner case of a path which includes a ..\?\. component
+// by rejecting any input paths which contain a ?, which is not a valid character
+// in a Windows filename.
+func rootCleanPath(s string, prefix, suffix []string) (string, error) {
+	// Reject paths which include a ? component (see above).
+	if stringslite.IndexByte(s, '?') >= 0 {
+		return "", windows.ERROR_INVALID_NAME
+	}
+
+	const fixedPrefix = `\\?\?`
+	buf := []byte(fixedPrefix)
+	for _, p := range prefix {
+		buf = append(buf, '\\')
+		buf = append(buf, []byte(p)...)
+	}
+	buf = append(buf, '\\')
+	buf = append(buf, []byte(s)...)
+	for _, p := range suffix {
+		buf = append(buf, '\\')
+		buf = append(buf, []byte(p)...)
+	}
+	s = string(buf)
+
+	s, err := syscall.FullPath(s)
+	if err != nil {
+		return "", err
+	}
+
+	s, ok := stringslite.CutPrefix(s, fixedPrefix)
+	if !ok {
+		return "", errPathEscapes
+	}
+	s = stringslite.TrimPrefix(s, `\`)
+	if s == "" {
+		s = "."
+	}
+
+	if !filepathlite.IsLocal(s) {
+		return "", errPathEscapes
+	}
+
+	return s, nil
+}
+
+type sysfdType = syscall.Handle
+
+// openRootNolog is OpenRoot.
+func openRootNolog(name string) (*Root, error) {
+	if name == "" {
+		return nil, &PathError{Op: "open", Path: name, Err: syscall.ENOENT}
+	}
+	path := fixLongPath(name)
+	fd, err := syscall.Open(path, syscall.O_RDONLY|syscall.O_CLOEXEC, 0)
+	if err != nil {
+		return nil, &PathError{Op: "open", Path: name, Err: err}
+	}
+	return newRoot(fd, name)
+}
+
+// newRoot returns a new Root.
+// If fd is not a directory, it closes it and returns an error.
+func newRoot(fd syscall.Handle, name string) (*Root, error) {
+	// Check that this is a directory.
+	//
+	// If we get any errors here, ignore them; worst case we create a Root
+	// which returns errors when you try to use it.
+	var fi syscall.ByHandleFileInformation
+	err := syscall.GetFileInformationByHandle(fd, &fi)
+	if err == nil && fi.FileAttributes&syscall.FILE_ATTRIBUTE_DIRECTORY == 0 {
+		syscall.CloseHandle(fd)
+		return nil, &PathError{Op: "open", Path: name, Err: errors.New("not a directory")}
+	}
+
+	r := &Root{&root{
+		fd:   fd,
+		name: name,
+	}}
+	runtime.SetFinalizer(r.root, (*root).Close)
+	return r, nil
+}
+
+// openRootInRoot is Root.OpenRoot.
+func openRootInRoot(r *Root, name string) (*Root, error) {
+	fd, err := doInRoot(r, name, rootOpenDir)
+	if err != nil {
+		return nil, &PathError{Op: "openat", Path: name, Err: err}
+	}
+	return newRoot(fd, name)
+}
+
+// rootOpenFileNolog is Root.OpenFile.
+func rootOpenFileNolog(root *Root, name string, flag int, perm FileMode) (*File, error) {
+	fd, err := doInRoot(root, name, func(parent syscall.Handle, name string) (syscall.Handle, error) {
+		return openat(parent, name, flag, perm)
+	})
+	if err != nil {
+		return nil, &PathError{Op: "openat", Path: name, Err: err}
+	}
+	return newFile(fd, joinPath(root.Name(), name), "file"), nil
+}
+
+func openat(dirfd syscall.Handle, name string, flag int, perm FileMode) (syscall.Handle, error) {
+	h, err := windows.Openat(dirfd, name, flag|syscall.O_CLOEXEC|windows.O_NOFOLLOW_ANY, syscallMode(perm))
+	if err == syscall.ELOOP || err == syscall.ENOTDIR {
+		if link, err := readReparseLinkAt(dirfd, name); err == nil {
+			return syscall.InvalidHandle, errSymlink(link)
+		}
+	}
+	return h, err
+}
+
+func readReparseLinkAt(dirfd syscall.Handle, name string) (string, error) {
+	objectName, err := windows.NewNTUnicodeString(name)
+	if err != nil {
+		return "", err
+	}
+	objAttrs := &windows.OBJECT_ATTRIBUTES{
+		ObjectName: objectName,
+	}
+	if dirfd != syscall.InvalidHandle {
+		objAttrs.RootDirectory = dirfd
+	}
+	objAttrs.Length = uint32(unsafe.Sizeof(*objAttrs))
+	var h syscall.Handle
+	err = windows.NtCreateFile(
+		&h,
+		windows.FILE_GENERIC_READ,
+		objAttrs,
+		&windows.IO_STATUS_BLOCK{},
+		nil,
+		uint32(syscall.FILE_ATTRIBUTE_NORMAL),
+		syscall.FILE_SHARE_READ|syscall.FILE_SHARE_WRITE|syscall.FILE_SHARE_DELETE,
+		windows.FILE_OPEN,
+		windows.FILE_SYNCHRONOUS_IO_NONALERT|windows.FILE_OPEN_REPARSE_POINT,
+		0,
+		0,
+	)
+	if err != nil {
+		return "", err
+	}
+	defer syscall.CloseHandle(h)
+	return readReparseLinkHandle(h)
+}
+
+func rootOpenDir(parent syscall.Handle, name string) (syscall.Handle, error) {
+	h, err := openat(parent, name, syscall.O_RDONLY|syscall.O_CLOEXEC|windows.O_DIRECTORY, 0)
+	if err == syscall.ERROR_FILE_NOT_FOUND {
+		// Windows returns:
+		//   - ERROR_PATH_NOT_FOUND if any path compoenent before the leaf
+		//     does not exist or is not a directory.
+		//   - ERROR_FILE_NOT_FOUND if the leaf does not exist.
+		//
+		// This differs from Unix behavior, which is:
+		//   - ENOENT if any path component does not exist, including the leaf.
+		//   - ENOTDIR if any path component before the leaf is not a directory.
+		//
+		// We map syscall.ENOENT to ERROR_FILE_NOT_FOUND and syscall.ENOTDIR
+		// to ERROR_PATH_NOT_FOUND, but the Windows errors don't quite match.
+		//
+		// For consistency with os.Open, convert ERROR_FILE_NOT_FOUND here into
+		// ERROR_PATH_NOT_FOUND, since we're opening a non-leaf path component.
+		err = syscall.ERROR_PATH_NOT_FOUND
+	}
+	return h, err
+}
+
+func rootStat(r *Root, name string, lstat bool) (FileInfo, error) {
+	if len(name) > 0 && IsPathSeparator(name[len(name)-1]) {
+		// When a filename ends with a path separator,
+		// Lstat behaves like Stat.
+		//
+		// This behavior is not based on a principled decision here,
+		// merely the empirical evidence that Lstat behaves this way.
+		lstat = false
+	}
+	fi, err := doInRoot(r, name, func(parent syscall.Handle, n string) (FileInfo, error) {
+		fd, err := openat(parent, n, windows.O_OPEN_REPARSE, 0)
+		if err != nil {
+			return nil, err
+		}
+		defer syscall.CloseHandle(fd)
+		fi, err := statHandle(name, fd)
+		if err != nil {
+			return nil, err
+		}
+		if !lstat && fi.(*fileStat).isReparseTagNameSurrogate() {
+			link, err := readReparseLinkHandle(fd)
+			if err != nil {
+				return nil, err
+			}
+			return nil, errSymlink(link)
+		}
+		return fi, nil
+	})
+	if err != nil {
+		return nil, &PathError{Op: "statat", Path: name, Err: err}
+	}
+	return fi, nil
+}
+
+func mkdirat(dirfd syscall.Handle, name string, perm FileMode) error {
+	return windows.Mkdirat(dirfd, name, syscallMode(perm))
+}
+
+func removeat(dirfd syscall.Handle, name string) error {
+	return windows.Deleteat(dirfd, name)
+}
diff --git a/src/os/root_windows_test.go b/src/os/root_windows_test.go
new file mode 100644
index 00000000..62e20971
--- /dev/null
+++ b/src/os/root_windows_test.go
@@ -0,0 +1,53 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build windows
+
+package os_test
+
+import (
+	"errors"
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+// Verify that Root.Open rejects Windows reserved names.
+func TestRootWindowsDeviceNames(t *testing.T) {
+	r, err := os.OpenRoot(t.TempDir())
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer r.Close()
+	if f, err := r.Open("NUL"); err == nil {
+		t.Errorf(`r.Open("NUL") succeeded; want error"`)
+		f.Close()
+	}
+}
+
+// Verify that Root.Open is case-insensitive.
+// (The wrong options to NtOpenFile could make operations case-sensitive,
+// so this is worth checking.)
+func TestRootWindowsCaseInsensitivity(t *testing.T) {
+	dir := t.TempDir()
+	if err := os.WriteFile(filepath.Join(dir, "file"), nil, 0666); err != nil {
+		t.Fatal(err)
+	}
+	r, err := os.OpenRoot(dir)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer r.Close()
+	f, err := r.Open("FILE")
+	if err != nil {
+		t.Fatal(err)
+	}
+	f.Close()
+	if err := r.Remove("FILE"); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := os.Stat(filepath.Join(dir, "file")); !errors.Is(err, os.ErrNotExist) {
+		t.Fatalf("os.Stat(file) after deletion: %v, want ErrNotFound", err)
+	}
+}
diff --git a/src/os/signal/signal.go b/src/os/signal/signal.go
index 9a4cd64f..b9fe16ba 100644
--- a/src/os/signal/signal.go
+++ b/src/os/signal/signal.go
@@ -7,6 +7,7 @@ package signal
 import (
 	"context"
 	"os"
+	"slices"
 	"sync"
 )
 
@@ -217,7 +218,7 @@ func Stop(c chan<- os.Signal) {
 
 	for i, s := range handlers.stopping {
 		if s.c == c {
-			handlers.stopping = append(handlers.stopping[:i], handlers.stopping[i+1:]...)
+			handlers.stopping = slices.Delete(handlers.stopping, i, i+1)
 			break
 		}
 	}
diff --git a/src/os/stat_wasip1.go b/src/os/stat_wasip1.go
index 85a36498..dcf2e38d 100644
--- a/src/os/stat_wasip1.go
+++ b/src/os/stat_wasip1.go
@@ -15,7 +15,6 @@ import (
 func fillFileStatFromSys(fs *fileStat, name string) {
 	fs.name = filepathlite.Base(name)
 	fs.size = int64(fs.sys.Size)
-	fs.mode = FileMode(fs.sys.Mode)
 	fs.modTime = time.Unix(0, int64(fs.sys.Mtime))
 
 	switch fs.sys.Filetype {
@@ -32,6 +31,15 @@ func fillFileStatFromSys(fs *fileStat, name string) {
 	case syscall.FILETYPE_SYMBOLIC_LINK:
 		fs.mode |= ModeSymlink
 	}
+
+	// WASI does not support unix-like permissions, but Go programs are likely
+	// to expect the permission bits to not be zero so we set defaults to help
+	// avoid breaking applications that are migrating to WASM.
+	if fs.sys.Filetype == syscall.FILETYPE_DIRECTORY {
+		fs.mode |= 0700
+	} else {
+		fs.mode |= 0600
+	}
 }
 
 // For testing.
diff --git a/src/os/tempfile_test.go b/src/os/tempfile_test.go
index 82f0aabd..f2b4ffa7 100644
--- a/src/os/tempfile_test.go
+++ b/src/os/tempfile_test.go
@@ -17,13 +17,7 @@ import (
 func TestCreateTemp(t *testing.T) {
 	t.Parallel()
 
-	dir, err := MkdirTemp("", "TestCreateTempBadDir")
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer RemoveAll(dir)
-
-	nonexistentDir := filepath.Join(dir, "_not_exists_")
+	nonexistentDir := filepath.Join(t.TempDir(), "_not_exists_")
 	f, err := CreateTemp(nonexistentDir, "foo")
 	if f != nil || err == nil {
 		t.Errorf("CreateTemp(%q, `foo`) = %v, %v", nonexistentDir, f, err)
@@ -57,11 +51,7 @@ func TestCreateTempPattern(t *testing.T) {
 func TestCreateTempBadPattern(t *testing.T) {
 	t.Parallel()
 
-	tmpDir, err := MkdirTemp("", t.Name())
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer RemoveAll(tmpDir)
+	tmpDir := t.TempDir()
 
 	const sep = string(PathSeparator)
 	tests := []struct {
@@ -152,14 +142,8 @@ func TestMkdirTemp(t *testing.T) {
 func TestMkdirTempBadDir(t *testing.T) {
 	t.Parallel()
 
-	dir, err := MkdirTemp("", "MkdirTempBadDir")
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer RemoveAll(dir)
-
-	badDir := filepath.Join(dir, "not-exist")
-	_, err = MkdirTemp(badDir, "foo")
+	badDir := filepath.Join(t.TempDir(), "not-exist")
+	_, err := MkdirTemp(badDir, "foo")
 	if pe, ok := err.(*fs.PathError); !ok || !IsNotExist(err) || pe.Path != badDir {
 		t.Errorf("TempDir error = %#v; want PathError for path %q satisfying IsNotExist", err, badDir)
 	}
@@ -168,11 +152,7 @@ func TestMkdirTempBadDir(t *testing.T) {
 func TestMkdirTempBadPattern(t *testing.T) {
 	t.Parallel()
 
-	tmpDir, err := MkdirTemp("", t.Name())
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer RemoveAll(tmpDir)
+	tmpDir := t.TempDir()
 
 	const sep = string(PathSeparator)
 	tests := []struct {
diff --git a/src/os/testdata/dirfs/dir/x b/src/os/testdata/dirfs/dir/x
old mode 100644
new mode 100755
diff --git a/src/os/user/lookup_windows.go b/src/os/user/lookup_windows.go
index a48fc897..e0e77f3e 100644
--- a/src/os/user/lookup_windows.go
+++ b/src/os/user/lookup_windows.go
@@ -5,9 +5,11 @@
 package user
 
 import (
+	"errors"
 	"fmt"
 	"internal/syscall/windows"
 	"internal/syscall/windows/registry"
+	"runtime"
 	"syscall"
 	"unsafe"
 )
@@ -84,16 +86,73 @@ func getProfilesDirectory() (string, error) {
 	}
 }
 
+func isServiceAccount(sid *syscall.SID) bool {
+	if !windows.IsValidSid(sid) {
+		// We don't accept SIDs from the public API, so this should never happen.
+		// Better be on the safe side and validate anyway.
+		return false
+	}
+	// The following RIDs are considered service user accounts as per
+	// https://learn.microsoft.com/en-us/windows/win32/secauthz/well-known-sids and
+	// https://learn.microsoft.com/en-us/windows/win32/services/service-user-accounts:
+	// - "S-1-5-18": LocalSystem
+	// - "S-1-5-19": LocalService
+	// - "S-1-5-20": NetworkService
+	if windows.GetSidSubAuthorityCount(sid) != windows.SID_REVISION ||
+		windows.GetSidIdentifierAuthority(sid) != windows.SECURITY_NT_AUTHORITY {
+		return false
+	}
+	switch windows.GetSidSubAuthority(sid, 0) {
+	case windows.SECURITY_LOCAL_SYSTEM_RID,
+		windows.SECURITY_LOCAL_SERVICE_RID,
+		windows.SECURITY_NETWORK_SERVICE_RID:
+		return true
+	}
+	return false
+}
+
+func isValidUserAccountType(sid *syscall.SID, sidType uint32) bool {
+	switch sidType {
+	case syscall.SidTypeUser:
+		return true
+	case syscall.SidTypeWellKnownGroup:
+		return isServiceAccount(sid)
+	}
+	return false
+}
+
+func isValidGroupAccountType(sidType uint32) bool {
+	switch sidType {
+	case syscall.SidTypeGroup:
+		return true
+	case syscall.SidTypeWellKnownGroup:
+		// Some well-known groups are also considered service accounts,
+		// so isValidUserAccountType would return true for them.
+		// We have historically allowed them in LookupGroup and LookupGroupId,
+		// so don't treat them as invalid here.
+		return true
+	case syscall.SidTypeAlias:
+		// https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-samr/7b2aeb27-92fc-41f6-8437-deb65d950921#gt_0387e636-5654-4910-9519-1f8326cf5ec0
+		// SidTypeAlias should also be treated as a group type next to SidTypeGroup
+		// and SidTypeWellKnownGroup:
+		// "alias object -> resource group: A group object..."
+		//
+		// Tests show that "Administrators" can be considered of type SidTypeAlias.
+		return true
+	}
+	return false
+}
+
 // lookupUsernameAndDomain obtains the username and domain for usid.
-func lookupUsernameAndDomain(usid *syscall.SID) (username, domain string, e error) {
-	username, domain, t, e := usid.LookupAccount("")
+func lookupUsernameAndDomain(usid *syscall.SID) (username, domain string, sidType uint32, e error) {
+	username, domain, sidType, e = usid.LookupAccount("")
 	if e != nil {
-		return "", "", e
+		return "", "", 0, e
 	}
-	if t != syscall.SidTypeUser {
-		return "", "", fmt.Errorf("user: should be user account type, not %d", t)
+	if !isValidUserAccountType(usid, sidType) {
+		return "", "", 0, fmt.Errorf("user: should be user account type, not %d", sidType)
 	}
-	return username, domain, nil
+	return username, domain, sidType, nil
 }
 
 // findHomeDirInRegistry finds the user home path based on the uid.
@@ -116,13 +175,7 @@ func lookupGroupName(groupname string) (string, error) {
 	if e != nil {
 		return "", e
 	}
-	// https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-samr/7b2aeb27-92fc-41f6-8437-deb65d950921#gt_0387e636-5654-4910-9519-1f8326cf5ec0
-	// SidTypeAlias should also be treated as a group type next to SidTypeGroup
-	// and SidTypeWellKnownGroup:
-	// "alias object -> resource group: A group object..."
-	//
-	// Tests show that "Administrators" can be considered of type SidTypeAlias.
-	if t != syscall.SidTypeGroup && t != syscall.SidTypeWellKnownGroup && t != syscall.SidTypeAlias {
+	if !isValidGroupAccountType(t) {
 		return "", fmt.Errorf("lookupGroupName: should be group account type, not %d", t)
 	}
 	return sid.String()
@@ -149,17 +202,13 @@ func listGroupsForUsernameAndDomain(username, domain string) ([]string, error) {
 	// NetUserGetLocalGroups() would return a list of LocalGroupUserInfo0
 	// elements which hold the names of local groups where the user participates.
 	// The list does not follow any sorting order.
-	//
-	// If no groups can be found for this user, NetUserGetLocalGroups() should
-	// always return the SID of a single group called "None", which
-	// also happens to be the primary group for the local user.
 	err = windows.NetUserGetLocalGroups(nil, q, 0, windows.LG_INCLUDE_INDIRECT, &p0, windows.MAX_PREFERRED_LENGTH, &entriesRead, &totalEntries)
 	if err != nil {
 		return nil, err
 	}
 	defer syscall.NetApiBufferFree(p0)
 	if entriesRead == 0 {
-		return nil, fmt.Errorf("listGroupsForUsernameAndDomain: NetUserGetLocalGroups() returned an empty list for domain: %s, username: %s", domain, username)
+		return nil, nil
 	}
 	entries := (*[1024]windows.LocalGroupUserInfo0)(unsafe.Pointer(p0))[:entriesRead:entriesRead]
 	var sids []string
@@ -200,36 +249,103 @@ var (
 )
 
 func current() (*User, error) {
-	t, e := syscall.OpenCurrentProcessToken()
-	if e != nil {
-		return nil, e
+	// Use runAsProcessOwner to ensure that we can access the process token
+	// when calling syscall.OpenCurrentProcessToken if the current thread
+	// is impersonating a different user. See https://go.dev/issue/68647.
+	var usr *User
+	err := runAsProcessOwner(func() error {
+		t, e := syscall.OpenCurrentProcessToken()
+		if e != nil {
+			return e
+		}
+		defer t.Close()
+		u, e := t.GetTokenUser()
+		if e != nil {
+			return e
+		}
+		pg, e := t.GetTokenPrimaryGroup()
+		if e != nil {
+			return e
+		}
+		uid, e := u.User.Sid.String()
+		if e != nil {
+			return e
+		}
+		gid, e := pg.PrimaryGroup.String()
+		if e != nil {
+			return e
+		}
+		dir, e := t.GetUserProfileDirectory()
+		if e != nil {
+			return e
+		}
+		username, e := windows.GetUserName(syscall.NameSamCompatible)
+		if e != nil {
+			return e
+		}
+		displayName, e := windows.GetUserName(syscall.NameDisplay)
+		if e != nil {
+			// Historically, the username is used as fallback
+			// when the display name can't be retrieved.
+			displayName = username
+		}
+		usr = &User{
+			Uid:      uid,
+			Gid:      gid,
+			Username: username,
+			Name:     displayName,
+			HomeDir:  dir,
+		}
+		return nil
+	})
+	return usr, err
+}
+
+// runAsProcessOwner runs f in the context of the current process owner,
+// that is, removing any impersonation that may be in effect before calling f,
+// and restoring the impersonation afterwards.
+func runAsProcessOwner(f func() error) error {
+	var impersonationRollbackErr error
+	runtime.LockOSThread()
+	defer func() {
+		// If impersonation failed, the thread is running with the wrong token,
+		// so it's better to terminate it.
+		// This is achieved by not calling runtime.UnlockOSThread.
+		if impersonationRollbackErr != nil {
+			println("os/user: failed to revert to previous token:", impersonationRollbackErr.Error())
+			runtime.Goexit()
+		} else {
+			runtime.UnlockOSThread()
+		}
+	}()
+	prevToken, isProcessToken, err := getCurrentToken()
+	if err != nil {
+		return fmt.Errorf("os/user: failed to get current token: %w", err)
 	}
-	defer t.Close()
-	u, e := t.GetTokenUser()
-	if e != nil {
-		return nil, e
+	defer prevToken.Close()
+	if !isProcessToken {
+		if err = windows.RevertToSelf(); err != nil {
+			return fmt.Errorf("os/user: failed to revert to self: %w", err)
+		}
+		defer func() {
+			impersonationRollbackErr = windows.ImpersonateLoggedOnUser(prevToken)
+		}()
 	}
-	pg, e := t.GetTokenPrimaryGroup()
-	if e != nil {
-		return nil, e
+	return f()
+}
+
+// getCurrentToken returns the current thread token, or
+// the process token if the thread doesn't have a token.
+func getCurrentToken() (t syscall.Token, isProcessToken bool, err error) {
+	thread, _ := windows.GetCurrentThread()
+	// Need TOKEN_DUPLICATE and TOKEN_IMPERSONATE to use the token in ImpersonateLoggedOnUser.
+	err = windows.OpenThreadToken(thread, syscall.TOKEN_QUERY|syscall.TOKEN_DUPLICATE|syscall.TOKEN_IMPERSONATE, true, &t)
+	if errors.Is(err, windows.ERROR_NO_TOKEN) {
+		// Not impersonating, use the process token.
+		isProcessToken = true
+		t, err = syscall.OpenCurrentProcessToken()
 	}
-	uid, e := u.User.Sid.String()
-	if e != nil {
-		return nil, e
-	}
-	gid, e := pg.PrimaryGroup.String()
-	if e != nil {
-		return nil, e
-	}
-	dir, e := t.GetUserProfileDirectory()
-	if e != nil {
-		return nil, e
-	}
-	username, domain, e := lookupUsernameAndDomain(u.User.Sid)
-	if e != nil {
-		return nil, e
-	}
-	return newUser(uid, gid, dir, username, domain)
+	return t, isProcessToken, err
 }
 
 // lookupUserPrimaryGroup obtains the primary group SID for a user using this method:
@@ -290,11 +406,7 @@ func lookupUserPrimaryGroup(username, domain string) (string, error) {
 }
 
 func newUserFromSid(usid *syscall.SID) (*User, error) {
-	username, domain, e := lookupUsernameAndDomain(usid)
-	if e != nil {
-		return nil, e
-	}
-	gid, e := lookupUserPrimaryGroup(username, domain)
+	username, domain, sidType, e := lookupUsernameAndDomain(usid)
 	if e != nil {
 		return nil, e
 	}
@@ -302,6 +414,19 @@ func newUserFromSid(usid *syscall.SID) (*User, error) {
 	if e != nil {
 		return nil, e
 	}
+	var gid string
+	if sidType == syscall.SidTypeWellKnownGroup {
+		// The SID does not contain a domain; this function's domain variable has
+		// been populated with the SID's identifier authority. This happens with
+		// special service user accounts such as "NT AUTHORITY\LocalSystem".
+		// In this case, gid is the same as the user SID.
+		gid = uid
+	} else {
+		gid, e = lookupUserPrimaryGroup(username, domain)
+		if e != nil {
+			return nil, e
+		}
+	}
 	// If this user has logged in at least once their home path should be stored
 	// in the registry under the specified SID. References:
 	// https://social.technet.microsoft.com/wiki/contents/articles/13895.how-to-remove-a-corrupted-user-profile-from-the-registry.aspx
@@ -331,7 +456,7 @@ func lookupUser(username string) (*User, error) {
 	if e != nil {
 		return nil, e
 	}
-	if t != syscall.SidTypeUser {
+	if !isValidUserAccountType(sid, t) {
 		return nil, fmt.Errorf("user: should be user account type, not %d", t)
 	}
 	return newUserFromSid(sid)
@@ -362,24 +487,52 @@ func lookupGroupId(gid string) (*Group, error) {
 	if err != nil {
 		return nil, err
 	}
-	if t != syscall.SidTypeGroup && t != syscall.SidTypeWellKnownGroup && t != syscall.SidTypeAlias {
+	if !isValidGroupAccountType(t) {
 		return nil, fmt.Errorf("lookupGroupId: should be group account type, not %d", t)
 	}
 	return &Group{Name: groupname, Gid: gid}, nil
 }
 
 func listGroups(user *User) ([]string, error) {
-	sid, err := syscall.StringToSid(user.Uid)
-	if err != nil {
-		return nil, err
-	}
-	username, domain, err := lookupUsernameAndDomain(sid)
-	if err != nil {
-		return nil, err
-	}
-	sids, err := listGroupsForUsernameAndDomain(username, domain)
-	if err != nil {
-		return nil, err
+	var sids []string
+	if u, err := Current(); err == nil && u.Uid == user.Uid {
+		// It is faster and more reliable to get the groups
+		// of the current user from the current process token.
+		err := runAsProcessOwner(func() error {
+			t, err := syscall.OpenCurrentProcessToken()
+			if err != nil {
+				return err
+			}
+			defer t.Close()
+			groups, err := windows.GetTokenGroups(t)
+			if err != nil {
+				return err
+			}
+			for _, g := range groups.AllGroups() {
+				sid, err := g.Sid.String()
+				if err != nil {
+					return err
+				}
+				sids = append(sids, sid)
+			}
+			return nil
+		})
+		if err != nil {
+			return nil, err
+		}
+	} else {
+		sid, err := syscall.StringToSid(user.Uid)
+		if err != nil {
+			return nil, err
+		}
+		username, domain, _, err := lookupUsernameAndDomain(sid)
+		if err != nil {
+			return nil, err
+		}
+		sids, err = listGroupsForUsernameAndDomain(username, domain)
+		if err != nil {
+			return nil, err
+		}
 	}
 	// Add the primary group of the user to the list if it is not already there.
 	// This is done only to comply with the POSIX concept of a primary group.
diff --git a/src/os/user/user_test.go b/src/os/user/user_test.go
index fa597b78..31486aed 100644
--- a/src/os/user/user_test.go
+++ b/src/os/user/user_test.go
@@ -45,8 +45,9 @@ func TestCurrent(t *testing.T) {
 }
 
 func BenchmarkCurrent(b *testing.B) {
+	// Benchmark current instead of Current because Current caches the result.
 	for i := 0; i < b.N; i++ {
-		Current()
+		current()
 	}
 }
 
diff --git a/src/os/user/user_windows_test.go b/src/os/user/user_windows_test.go
new file mode 100644
index 00000000..c7150337
--- /dev/null
+++ b/src/os/user/user_windows_test.go
@@ -0,0 +1,279 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package user
+
+import (
+	"crypto/rand"
+	"encoding/base64"
+	"errors"
+	"fmt"
+	"internal/syscall/windows"
+	"internal/testenv"
+	"os"
+	"os/exec"
+	"runtime"
+	"strconv"
+	"syscall"
+	"testing"
+	"unsafe"
+)
+
+// windowsTestAccount creates a test user and returns a token for that user.
+// If the user already exists, it will be deleted and recreated.
+// The caller is responsible for closing the token.
+func windowsTestAccount(t *testing.T) (syscall.Token, *User) {
+	if testenv.Builder() == "" {
+		// Adding and deleting users requires special permissions.
+		// Even if we have them, we don't want to create users on
+		// on dev machines, as they may not be cleaned up.
+		// See https://dev.go/issue/70396.
+		t.Skip("skipping non-hermetic test outside of Go builders")
+	}
+	const testUserName = "GoStdTestUser01"
+	var password [33]byte
+	rand.Read(password[:])
+	// Add special chars to ensure it satisfies password requirements.
+	pwd := base64.StdEncoding.EncodeToString(password[:]) + "_-As@!%*(1)4#2"
+	name, err := syscall.UTF16PtrFromString(testUserName)
+	if err != nil {
+		t.Fatal(err)
+	}
+	pwd16, err := syscall.UTF16PtrFromString(pwd)
+	if err != nil {
+		t.Fatal(err)
+	}
+	userInfo := windows.UserInfo1{
+		Name:     name,
+		Password: pwd16,
+		Priv:     windows.USER_PRIV_USER,
+	}
+	// Create user.
+	err = windows.NetUserAdd(nil, 1, (*byte)(unsafe.Pointer(&userInfo)), nil)
+	if errors.Is(err, syscall.ERROR_ACCESS_DENIED) {
+		t.Skip("skipping test; don't have permission to create user")
+	}
+	if errors.Is(err, windows.NERR_UserExists) {
+		// User already exists, delete and recreate.
+		if err = windows.NetUserDel(nil, name); err != nil {
+			t.Fatal(err)
+		}
+		if err = windows.NetUserAdd(nil, 1, (*byte)(unsafe.Pointer(&userInfo)), nil); err != nil {
+			t.Fatal(err)
+		}
+	} else if err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(func() {
+		if err = windows.NetUserDel(nil, name); err != nil {
+			if !errors.Is(err, windows.NERR_UserNotFound) {
+				t.Fatal(err)
+			}
+		}
+	})
+	domain, err := syscall.UTF16PtrFromString(".")
+	if err != nil {
+		t.Fatal(err)
+	}
+	const LOGON32_PROVIDER_DEFAULT = 0
+	const LOGON32_LOGON_INTERACTIVE = 2
+	var token syscall.Token
+	if err = windows.LogonUser(name, domain, pwd16, LOGON32_LOGON_INTERACTIVE, LOGON32_PROVIDER_DEFAULT, &token); err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(func() {
+		token.Close()
+	})
+	usr, err := Lookup(testUserName)
+	if err != nil {
+		t.Fatal(err)
+	}
+	return token, usr
+}
+
+func TestImpersonatedSelf(t *testing.T) {
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	want, err := current()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	levels := []uint32{
+		windows.SecurityAnonymous,
+		windows.SecurityIdentification,
+		windows.SecurityImpersonation,
+		windows.SecurityDelegation,
+	}
+	for _, level := range levels {
+		t.Run(strconv.Itoa(int(level)), func(t *testing.T) {
+			if err = windows.ImpersonateSelf(level); err != nil {
+				t.Fatal(err)
+			}
+			defer windows.RevertToSelf()
+
+			got, err := current()
+			if level == windows.SecurityAnonymous {
+				// We can't get the process token when using an anonymous token,
+				// so we expect an error here.
+				if err == nil {
+					t.Fatal("expected error")
+				}
+				return
+			}
+			if err != nil {
+				t.Fatal(err)
+			}
+			compare(t, want, got)
+		})
+	}
+}
+
+func TestImpersonated(t *testing.T) {
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	want, err := current()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// Create a test user and log in as that user.
+	token, _ := windowsTestAccount(t)
+
+	// Impersonate the test user.
+	if err = windows.ImpersonateLoggedOnUser(token); err != nil {
+		t.Fatal(err)
+	}
+	defer func() {
+		err = windows.RevertToSelf()
+		if err != nil {
+			// If we can't revert to self, we can't continue testing.
+			panic(err)
+		}
+	}()
+
+	got, err := current()
+	if err != nil {
+		t.Fatal(err)
+	}
+	compare(t, want, got)
+}
+
+func TestCurrentNetapi32(t *testing.T) {
+	if os.Getenv("GO_WANT_HELPER_PROCESS") == "1" {
+		// Test that Current does not load netapi32.dll.
+		// First call Current.
+		Current()
+
+		// Then check if netapi32.dll is loaded.
+		netapi32, err := syscall.UTF16PtrFromString("netapi32.dll")
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "error: %s\n", err.Error())
+			os.Exit(9)
+			return
+		}
+		mod, _ := windows.GetModuleHandle(netapi32)
+		if mod != 0 {
+			fmt.Fprintf(os.Stderr, "netapi32.dll is loaded\n")
+			os.Exit(9)
+			return
+		}
+		os.Exit(0)
+		return
+	}
+	exe := testenv.Executable(t)
+	cmd := testenv.CleanCmdEnv(exec.Command(exe, "-test.run=^TestCurrentNetapi32$"))
+	cmd.Env = append(cmd.Env, "GO_WANT_HELPER_PROCESS=1")
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		t.Fatalf("%v\n%s", err, out)
+	}
+}
+
+func TestGroupIdsTestUser(t *testing.T) {
+	// Create a test user and log in as that user.
+	_, user := windowsTestAccount(t)
+
+	gids, err := user.GroupIds()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if err != nil {
+		t.Fatalf("%+v.GroupIds(): %v", user, err)
+	}
+	if !containsID(gids, user.Gid) {
+		t.Errorf("%+v.GroupIds() = %v; does not contain user GID %s", user, gids, user.Gid)
+	}
+}
+
+var serviceAccounts = []struct {
+	sid  string
+	name string
+}{
+	{"S-1-5-18", "NT AUTHORITY\\SYSTEM"},
+	{"S-1-5-19", "NT AUTHORITY\\LOCAL SERVICE"},
+	{"S-1-5-20", "NT AUTHORITY\\NETWORK SERVICE"},
+}
+
+func TestLookupServiceAccount(t *testing.T) {
+	t.Parallel()
+	for _, tt := range serviceAccounts {
+		u, err := Lookup(tt.name)
+		if err != nil {
+			t.Errorf("Lookup(%q): %v", tt.name, err)
+			continue
+		}
+		if u.Uid != tt.sid {
+			t.Errorf("unexpected uid for %q; got %q, want %q", u.Name, u.Uid, tt.sid)
+		}
+	}
+}
+
+func TestLookupIdServiceAccount(t *testing.T) {
+	t.Parallel()
+	for _, tt := range serviceAccounts {
+		u, err := LookupId(tt.sid)
+		if err != nil {
+			t.Errorf("LookupId(%q): %v", tt.sid, err)
+			continue
+		}
+		if u.Gid != tt.sid {
+			t.Errorf("unexpected gid for %q; got %q, want %q", u.Name, u.Gid, tt.sid)
+		}
+		if u.Username != tt.name {
+			t.Errorf("unexpected user name for %q; got %q, want %q", u.Gid, u.Username, tt.name)
+		}
+	}
+}
+
+func TestLookupGroupServiceAccount(t *testing.T) {
+	t.Parallel()
+	for _, tt := range serviceAccounts {
+		u, err := LookupGroup(tt.name)
+		if err != nil {
+			t.Errorf("LookupGroup(%q): %v", tt.name, err)
+			continue
+		}
+		if u.Gid != tt.sid {
+			t.Errorf("unexpected gid for %q; got %q, want %q", u.Name, u.Gid, tt.sid)
+		}
+	}
+}
+
+func TestLookupGroupIdServiceAccount(t *testing.T) {
+	t.Parallel()
+	for _, tt := range serviceAccounts {
+		u, err := LookupGroupId(tt.sid)
+		if err != nil {
+			t.Errorf("LookupGroupId(%q): %v", tt.sid, err)
+			continue
+		}
+		if u.Gid != tt.sid {
+			t.Errorf("unexpected gid for %q; got %q, want %q", u.Name, u.Gid, tt.sid)
+		}
+	}
+}
diff --git a/src/os/wait_wait6.go b/src/os/wait_wait6.go
index 10314288..113535e5 100644
--- a/src/os/wait_wait6.go
+++ b/src/os/wait_wait6.go
@@ -15,18 +15,18 @@ import (
 // succeed immediately, and reports whether it has done so.
 // It does not actually call p.Wait.
 func (p *Process) blockUntilWaitable() (bool, error) {
-	var errno syscall.Errno
-	for {
-		_, errno = wait6(_P_PID, p.Pid, syscall.WEXITED|syscall.WNOWAIT)
-		if errno != syscall.EINTR {
-			break
+	err := ignoringEINTR(func() error {
+		_, errno := wait6(_P_PID, p.Pid, syscall.WEXITED|syscall.WNOWAIT)
+		if errno != 0 {
+			return errno
 		}
-	}
+		return nil
+	})
 	runtime.KeepAlive(p)
-	if errno == syscall.ENOSYS {
+	if err == syscall.ENOSYS {
 		return false, nil
-	} else if errno != 0 {
-		return false, NewSyscallError("wait6", errno)
+	} else if err != nil {
+		return false, NewSyscallError("wait6", err)
 	}
 	return true, nil
 }
diff --git a/src/os/wait_waitid.go b/src/os/wait_waitid.go
index cd078f35..832dbe90 100644
--- a/src/os/wait_waitid.go
+++ b/src/os/wait_waitid.go
@@ -10,39 +10,28 @@
 package os
 
 import (
+	"internal/syscall/unix"
 	"runtime"
 	"syscall"
-	"unsafe"
 )
 
-const _P_PID = 1
-
 // blockUntilWaitable attempts to block until a call to p.Wait will
 // succeed immediately, and reports whether it has done so.
 // It does not actually call p.Wait.
 func (p *Process) blockUntilWaitable() (bool, error) {
-	// The waitid system call expects a pointer to a siginfo_t,
-	// which is 128 bytes on all Linux systems.
-	// On darwin/amd64, it requires 104 bytes.
-	// We don't care about the values it returns.
-	var siginfo [16]uint64
-	psig := &siginfo[0]
-	var e syscall.Errno
-	for {
-		_, _, e = syscall.Syscall6(syscall.SYS_WAITID, _P_PID, uintptr(p.Pid), uintptr(unsafe.Pointer(psig)), syscall.WEXITED|syscall.WNOWAIT, 0, 0)
-		if e != syscall.EINTR {
-			break
-		}
-	}
+	var info unix.SiginfoChild
+	err := ignoringEINTR(func() error {
+		return unix.Waitid(unix.P_PID, p.Pid, &info, syscall.WEXITED|syscall.WNOWAIT, nil)
+	})
 	runtime.KeepAlive(p)
-	if e != 0 {
+	if err != nil {
 		// waitid has been available since Linux 2.6.9, but
 		// reportedly is not available in Ubuntu on Windows.
 		// See issue 16610.
-		if e == syscall.ENOSYS {
+		if err == syscall.ENOSYS {
 			return false, nil
 		}
-		return false, NewSyscallError("waitid", e)
+		return false, NewSyscallError("waitid", err)
 	}
 	return true, nil
 }
diff --git a/src/os/writeto_linux_test.go b/src/os/writeto_linux_test.go
index e3900631..59caecd0 100644
--- a/src/os/writeto_linux_test.go
+++ b/src/os/writeto_linux_test.go
@@ -8,13 +8,11 @@ import (
 	"bytes"
 	"internal/poll"
 	"io"
-	"math/rand"
 	"net"
 	. "os"
 	"strconv"
 	"syscall"
 	"testing"
-	"time"
 )
 
 func TestSendFile(t *testing.T) {
@@ -102,7 +100,7 @@ func newSendFileTest(t *testing.T, proto string, size int64) (net.Conn, *File, n
 	hook := hookSendFile(t)
 
 	client, server := createSocketPair(t, proto)
-	tempFile, data := createTempFile(t, size)
+	tempFile, data := createTempFile(t, "writeto-sendfile-to-socket", size)
 
 	return client, tempFile, server, data, hook
 }
@@ -133,30 +131,3 @@ type sendFileHook struct {
 	handled bool
 	err     error
 }
-
-func createTempFile(t *testing.T, size int64) (*File, []byte) {
-	f, err := CreateTemp(t.TempDir(), "writeto-sendfile-to-socket")
-	if err != nil {
-		t.Fatalf("failed to create temporary file: %v", err)
-	}
-	t.Cleanup(func() {
-		f.Close()
-	})
-
-	randSeed := time.Now().Unix()
-	t.Logf("random data seed: %d\n", randSeed)
-	prng := rand.New(rand.NewSource(randSeed))
-	data := make([]byte, size)
-	prng.Read(data)
-	if _, err := f.Write(data); err != nil {
-		t.Fatalf("failed to create and feed the file: %v", err)
-	}
-	if err := f.Sync(); err != nil {
-		t.Fatalf("failed to save the file: %v", err)
-	}
-	if _, err := f.Seek(0, io.SeekStart); err != nil {
-		t.Fatalf("failed to rewind the file: %v", err)
-	}
-
-	return f, data
-}
diff --git a/src/os/zero_copy_freebsd.go b/src/os/zero_copy_freebsd.go
new file mode 100644
index 00000000..aacfe861
--- /dev/null
+++ b/src/os/zero_copy_freebsd.go
@@ -0,0 +1,57 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package os
+
+import (
+	"internal/poll"
+	"io"
+)
+
+var pollCopyFileRange = poll.CopyFileRange
+
+func (f *File) writeTo(w io.Writer) (written int64, handled bool, err error) {
+	return 0, false, nil
+}
+
+func (f *File) readFrom(r io.Reader) (written int64, handled bool, err error) {
+	// copy_file_range(2) doesn't support destinations opened with
+	// O_APPEND, so don't bother to try zero-copy with these system calls.
+	//
+	// Visit https://man.freebsd.org/cgi/man.cgi?copy_file_range(2)#ERRORS for details.
+	if f.appendMode {
+		return 0, false, nil
+	}
+
+	var (
+		remain int64
+		lr     *io.LimitedReader
+	)
+	if lr, r, remain = tryLimitedReader(r); remain <= 0 {
+		return 0, true, nil
+	}
+
+	var src *File
+	switch v := r.(type) {
+	case *File:
+		src = v
+	case fileWithoutWriteTo:
+		src = v.File
+	default:
+		return 0, false, nil
+	}
+
+	if src.checkValid("ReadFrom") != nil {
+		// Avoid returning the error as we report handled as false,
+		// leave further error handling as the responsibility of the caller.
+		return 0, false, nil
+	}
+
+	written, handled, err = pollCopyFileRange(&f.pfd, &src.pfd, remain)
+	if lr != nil {
+		lr.N -= written
+	}
+
+	return written, handled, wrapSyscallError("copy_file_range", err)
+}
diff --git a/src/os/zero_copy_linux.go b/src/os/zero_copy_linux.go
index 0afc19e1..9d666a3c 100644
--- a/src/os/zero_copy_linux.go
+++ b/src/os/zero_copy_linux.go
@@ -15,15 +15,6 @@ var (
 	pollSplice        = poll.Splice
 )
 
-// wrapSyscallError takes an error and a syscall name. If the error is
-// a syscall.Errno, it wraps it in an os.SyscallError using the syscall name.
-func wrapSyscallError(name string, err error) error {
-	if _, ok := err.(syscall.Errno); ok {
-		err = NewSyscallError(name, err)
-	}
-	return err
-}
-
 func (f *File) writeTo(w io.Writer) (written int64, handled bool, err error) {
 	pfd, network := getPollFDAndNetwork(w)
 	// TODO(panjf2000): same as File.spliceToFile.
@@ -37,7 +28,7 @@ func (f *File) writeTo(w io.Writer) (written int64, handled bool, err error) {
 	}
 
 	rerr := sc.Read(func(fd uintptr) (done bool) {
-		written, err, handled = poll.SendFile(pfd, int(fd), 1<<63-1)
+		written, err, handled = poll.SendFile(pfd, int(fd), 0)
 		return true
 	})
 
@@ -149,21 +140,6 @@ func getPollFDAndNetwork(i any) (*poll.FD, poll.String) {
 	return irc.PollFD(), irc.Network()
 }
 
-// tryLimitedReader tries to assert the io.Reader to io.LimitedReader, it returns the io.LimitedReader,
-// the underlying io.Reader and the remaining amount of bytes if the assertion succeeds,
-// otherwise it just returns the original io.Reader and the theoretical unlimited remaining amount of bytes.
-func tryLimitedReader(r io.Reader) (*io.LimitedReader, io.Reader, int64) {
-	var remain int64 = 1<<63 - 1 // by default, copy until EOF
-
-	lr, ok := r.(*io.LimitedReader)
-	if !ok {
-		return nil, r, remain
-	}
-
-	remain = lr.N
-	return lr, lr.R, remain
-}
-
 func isUnixOrTCP(network string) bool {
 	switch network {
 	case "tcp", "tcp4", "tcp6", "unix":
diff --git a/src/os/zero_copy_posix.go b/src/os/zero_copy_posix.go
new file mode 100644
index 00000000..161144fe
--- /dev/null
+++ b/src/os/zero_copy_posix.go
@@ -0,0 +1,36 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build unix || js || wasip1 || windows
+
+package os
+
+import (
+	"io"
+	"syscall"
+)
+
+// wrapSyscallError takes an error and a syscall name. If the error is
+// a syscall.Errno, it wraps it in an os.SyscallError using the syscall name.
+func wrapSyscallError(name string, err error) error {
+	if _, ok := err.(syscall.Errno); ok {
+		err = NewSyscallError(name, err)
+	}
+	return err
+}
+
+// tryLimitedReader tries to assert the io.Reader to io.LimitedReader, it returns the io.LimitedReader,
+// the underlying io.Reader and the remaining amount of bytes if the assertion succeeds,
+// otherwise it just returns the original io.Reader and the theoretical unlimited remaining amount of bytes.
+func tryLimitedReader(r io.Reader) (*io.LimitedReader, io.Reader, int64) {
+	var remain int64 = 1<<63 - 1 // by default, copy until EOF
+
+	lr, ok := r.(*io.LimitedReader)
+	if !ok {
+		return nil, r, remain
+	}
+
+	remain = lr.N
+	return lr, lr.R, remain
+}
diff --git a/src/os/zero_copy_solaris.go b/src/os/zero_copy_solaris.go
new file mode 100644
index 00000000..94a8de60
--- /dev/null
+++ b/src/os/zero_copy_solaris.go
@@ -0,0 +1,92 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package os
+
+import (
+	"internal/poll"
+	"io"
+	"runtime"
+	"syscall"
+)
+
+func (f *File) writeTo(w io.Writer) (written int64, handled bool, err error) {
+	return 0, false, nil
+}
+
+// readFrom is basically a refactor of net.sendFile, but adapted to work for the target of *File.
+func (f *File) readFrom(r io.Reader) (written int64, handled bool, err error) {
+	var remain int64 = 0 // 0 indicates sending until EOF
+	lr, ok := r.(*io.LimitedReader)
+	if ok {
+		remain, r = lr.N, lr.R
+		if remain <= 0 {
+			return 0, true, nil
+		}
+	}
+
+	var src *File
+	switch v := r.(type) {
+	case *File:
+		src = v
+	case fileWithoutWriteTo:
+		src = v.File
+	default:
+		return 0, false, nil
+	}
+
+	if src.checkValid("ReadFrom") != nil {
+		// Avoid returning the error as we report handled as false,
+		// leave further error handling as the responsibility of the caller.
+		return 0, false, nil
+	}
+
+	// If fd_in and fd_out refer to the same file and the source and target ranges overlap,
+	// sendfile(2) on SunOS will allow this kind of overlapping and work like a memmove,
+	// in this case the file content remains the same after copying, which is not what we want.
+	// Thus, we just bail out here and leave it to generic copy when it's a file copying itself.
+	if f.pfd.Sysfd == src.pfd.Sysfd {
+		return 0, false, nil
+	}
+
+	// sendfile() on illumos seems to incur intermittent failures when the
+	// target file is a standard stream (stdout/stderr), we hereby skip any
+	// anything other than regular files conservatively and leave them to generic copy.
+	// Check out https://go.dev/issue/68863 for more details.
+	if runtime.GOOS == "illumos" {
+		fi, err := f.Stat()
+		if err != nil {
+			return 0, false, nil
+		}
+		st, ok := fi.Sys().(*syscall.Stat_t)
+		if !ok {
+			return 0, false, nil
+		}
+		if typ := st.Mode & syscall.S_IFMT; typ != syscall.S_IFREG {
+			return 0, false, nil
+		}
+	}
+
+	sc, err := src.SyscallConn()
+	if err != nil {
+		return
+	}
+
+	// System call sendfile()s on Solaris and illumos support file-to-file copying.
+	// Check out https://docs.oracle.com/cd/E86824_01/html/E54768/sendfile-3ext.html and
+	// https://docs.oracle.com/cd/E88353_01/html/E37843/sendfile-3c.html and
+	// https://illumos.org/man/3EXT/sendfile for more details.
+	rerr := sc.Read(func(fd uintptr) bool {
+		written, err, handled = poll.SendFile(&f.pfd, int(fd), remain)
+		return true
+	})
+	if lr != nil {
+		lr.N = remain - written
+	}
+	if err == nil {
+		err = rerr
+	}
+
+	return written, handled, wrapSyscallError("sendfile", err)
+}
diff --git a/src/os/zero_copy_stub.go b/src/os/zero_copy_stub.go
index 9ec58081..0470a205 100644
--- a/src/os/zero_copy_stub.go
+++ b/src/os/zero_copy_stub.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build !linux
+//go:build !freebsd && !linux && !solaris
 
 package os
 
diff --git a/src/path/filepath/match_test.go b/src/path/filepath/match_test.go
index c6b1c505..f415b040 100644
--- a/src/path/filepath/match_test.go
+++ b/src/path/filepath/match_test.go
@@ -9,7 +9,6 @@ import (
 	"internal/testenv"
 	"os"
 	. "path/filepath"
-	"reflect"
 	"runtime"
 	"slices"
 	"strings"
@@ -327,20 +326,7 @@ func TestWindowsGlob(t *testing.T) {
 	}
 
 	// test relative paths
-	wd, err := os.Getwd()
-	if err != nil {
-		t.Fatal(err)
-	}
-	err = os.Chdir(tmpDir)
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer func() {
-		err := os.Chdir(wd)
-		if err != nil {
-			t.Fatal(err)
-		}
-	}()
+	t.Chdir(tmpDir)
 	for _, test := range tests {
 		err := test.globRel("")
 		if err != nil {
@@ -367,7 +353,7 @@ func TestNonWindowsGlobEscape(t *testing.T) {
 	if err != nil {
 		t.Fatalf("Glob error for %q: %s", pattern, err)
 	}
-	if !reflect.DeepEqual(matches, want) {
+	if !slices.Equal(matches, want) {
 		t.Fatalf("Glob(%#q) = %v want %v", pattern, matches, want)
 	}
 }
diff --git a/src/path/filepath/path_test.go b/src/path/filepath/path_test.go
index b24f39c5..e9cd82d6 100644
--- a/src/path/filepath/path_test.go
+++ b/src/path/filepath/path_test.go
@@ -364,7 +364,7 @@ func TestSplitList(t *testing.T) {
 		tests = append(tests, winsplitlisttests...)
 	}
 	for _, test := range tests {
-		if l := filepath.SplitList(test.list); !reflect.DeepEqual(l, test.result) {
+		if l := filepath.SplitList(test.list); !slices.Equal(l, test.result) {
 			t.Errorf("SplitList(%#q) = %#q, want %#q", test.list, l, test.result)
 		}
 	}
@@ -597,45 +597,6 @@ func mark(d fs.DirEntry, err error, errors *[]error, clear bool) error {
 	return nil
 }
 
-// chdir changes the current working directory to the named directory,
-// and then restore the original working directory at the end of the test.
-func chdir(t *testing.T, dir string) {
-	olddir, err := os.Getwd()
-	if err != nil {
-		t.Fatalf("getwd %s: %v", dir, err)
-	}
-	if err := os.Chdir(dir); err != nil {
-		t.Fatalf("chdir %s: %v", dir, err)
-	}
-
-	t.Cleanup(func() {
-		if err := os.Chdir(olddir); err != nil {
-			t.Errorf("restore original working directory %s: %v", olddir, err)
-			os.Exit(1)
-		}
-	})
-}
-
-func chtmpdir(t *testing.T) (restore func()) {
-	oldwd, err := os.Getwd()
-	if err != nil {
-		t.Fatalf("chtmpdir: %v", err)
-	}
-	d, err := os.MkdirTemp("", "test")
-	if err != nil {
-		t.Fatalf("chtmpdir: %v", err)
-	}
-	if err := os.Chdir(d); err != nil {
-		t.Fatalf("chtmpdir: %v", err)
-	}
-	return func() {
-		if err := os.Chdir(oldwd); err != nil {
-			t.Fatalf("chtmpdir: %v", err)
-		}
-		os.RemoveAll(d)
-	}
-}
-
 // tempDirCanonical returns a temporary directory for the test to use, ensuring
 // that the returned path does not contain symlinks.
 func tempDirCanonical(t *testing.T) string {
@@ -663,21 +624,7 @@ func TestWalkDir(t *testing.T) {
 }
 
 func testWalk(t *testing.T, walk func(string, fs.WalkDirFunc) error, errVisit int) {
-	if runtime.GOOS == "ios" {
-		restore := chtmpdir(t)
-		defer restore()
-	}
-
-	tmpDir := t.TempDir()
-
-	origDir, err := os.Getwd()
-	if err != nil {
-		t.Fatal("finding working dir:", err)
-	}
-	if err = os.Chdir(tmpDir); err != nil {
-		t.Fatal("entering temp dir:", err)
-	}
-	defer os.Chdir(origDir)
+	t.Chdir(t.TempDir())
 
 	makeTree(t)
 	errors := make([]error, 0, 10)
@@ -686,7 +633,7 @@ func testWalk(t *testing.T, walk func(string, fs.WalkDirFunc) error, errVisit in
 		return mark(d, err, &errors, clear)
 	}
 	// Expect no errors.
-	err = walk(tree.name, markFn)
+	err := walk(tree.name, markFn)
 	if err != nil {
 		t.Fatalf("no error expected, found: %s", err)
 	}
@@ -1004,7 +951,7 @@ func TestWalkSymlinkRoot(t *testing.T) {
 				t.Fatal(err)
 			}
 
-			if !reflect.DeepEqual(walked, tt.want) {
+			if !slices.Equal(walked, tt.want) {
 				t.Logf("Walk(%#q) visited %#q; want %#q", tt.root, walked, tt.want)
 				if slices.Contains(tt.buggyGOOS, runtime.GOOS) {
 					t.Logf("(ignoring known bug on %v)", runtime.GOOS)
@@ -1225,22 +1172,7 @@ func testEvalSymlinks(t *testing.T, path, want string) {
 }
 
 func testEvalSymlinksAfterChdir(t *testing.T, wd, path, want string) {
-	cwd, err := os.Getwd()
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer func() {
-		err := os.Chdir(cwd)
-		if err != nil {
-			t.Fatal(err)
-		}
-	}()
-
-	err = os.Chdir(wd)
-	if err != nil {
-		t.Fatal(err)
-	}
-
+	t.Chdir(wd)
 	have, err := filepath.EvalSymlinks(path)
 	if err != nil {
 		t.Errorf("EvalSymlinks(%q) in %q directory error: %v", path, wd, err)
@@ -1314,8 +1246,7 @@ func TestEvalSymlinks(t *testing.T) {
 
 func TestEvalSymlinksIsNotExist(t *testing.T) {
 	testenv.MustHaveSymlink(t)
-
-	defer chtmpdir(t)()
+	t.Chdir(t.TempDir())
 
 	_, err := filepath.EvalSymlinks("notexist")
 	if !os.IsNotExist(err) {
@@ -1396,10 +1327,10 @@ func TestIssue13582(t *testing.T) {
 // Issue 57905.
 func TestRelativeSymlinkToAbsolute(t *testing.T) {
 	testenv.MustHaveSymlink(t)
-	// Not parallel: uses os.Chdir.
+	// Not parallel: uses t.Chdir.
 
 	tmpDir := t.TempDir()
-	chdir(t, tmpDir)
+	t.Chdir(tmpDir)
 
 	// Create "link" in the current working directory as a symlink to an arbitrary
 	// absolute path. On macOS, this path is likely to begin with a symlink
@@ -1452,18 +1383,10 @@ var absTests = []string{
 
 func TestAbs(t *testing.T) {
 	root := t.TempDir()
-	wd, err := os.Getwd()
-	if err != nil {
-		t.Fatal("getwd failed: ", err)
-	}
-	err = os.Chdir(root)
-	if err != nil {
-		t.Fatal("chdir failed: ", err)
-	}
-	defer os.Chdir(wd)
+	t.Chdir(root)
 
 	for _, dir := range absTestDirs {
-		err = os.Mkdir(dir, 0777)
+		err := os.Mkdir(dir, 0777)
 		if err != nil {
 			t.Fatal("Mkdir failed: ", err)
 		}
@@ -1485,7 +1408,7 @@ func TestAbs(t *testing.T) {
 		tests = append(slices.Clip(tests), extra...)
 	}
 
-	err = os.Chdir(absTestDirs[0])
+	err := os.Chdir(absTestDirs[0])
 	if err != nil {
 		t.Fatal("chdir failed: ", err)
 	}
@@ -1521,16 +1444,7 @@ func TestAbs(t *testing.T) {
 // a valid path, so it can't be used with os.Stat.
 func TestAbsEmptyString(t *testing.T) {
 	root := t.TempDir()
-
-	wd, err := os.Getwd()
-	if err != nil {
-		t.Fatal("getwd failed: ", err)
-	}
-	err = os.Chdir(root)
-	if err != nil {
-		t.Fatal("chdir failed: ", err)
-	}
-	defer os.Chdir(wd)
+	t.Chdir(root)
 
 	info, err := os.Stat(root)
 	if err != nil {
@@ -1757,19 +1671,9 @@ func TestBug3486(t *testing.T) { // https://golang.org/issue/3486
 
 func testWalkSymlink(t *testing.T, mklink func(target, link string) error) {
 	tmpdir := t.TempDir()
+	t.Chdir(tmpdir)
 
-	wd, err := os.Getwd()
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.Chdir(wd)
-
-	err = os.Chdir(tmpdir)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	err = mklink(tmpdir, "link")
+	err := mklink(tmpdir, "link")
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -1882,13 +1786,7 @@ func TestEvalSymlinksAboveRoot(t *testing.T) {
 // Issue 30520 part 2.
 func TestEvalSymlinksAboveRootChdir(t *testing.T) {
 	testenv.MustHaveSymlink(t)
-
-	tmpDir, err := os.MkdirTemp("", "TestEvalSymlinksAboveRootChdir")
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.RemoveAll(tmpDir)
-	chdir(t, tmpDir)
+	t.Chdir(t.TempDir())
 
 	subdir := filepath.Join("a", "b")
 	if err := os.MkdirAll(subdir, 0777); err != nil {
@@ -1950,18 +1848,17 @@ func TestIssue51617(t *testing.T) {
 		t.Fatal(err)
 	}
 	want := []string{".", "a", filepath.Join("a", "bad"), filepath.Join("a", "next")}
-	if !reflect.DeepEqual(saw, want) {
+	if !slices.Equal(saw, want) {
 		t.Errorf("got directories %v, want %v", saw, want)
 	}
 }
 
 func TestEscaping(t *testing.T) {
-	dir1 := t.TempDir()
-	dir2 := t.TempDir()
-	chdir(t, dir1)
+	dir := t.TempDir()
+	t.Chdir(t.TempDir())
 
 	for _, p := range []string{
-		filepath.Join(dir2, "x"),
+		filepath.Join(dir, "x"),
 	} {
 		if !filepath.IsLocal(p) {
 			continue
@@ -1970,7 +1867,7 @@ func TestEscaping(t *testing.T) {
 		if err != nil {
 			f.Close()
 		}
-		ents, err := os.ReadDir(dir2)
+		ents, err := os.ReadDir(dir)
 		if err != nil {
 			t.Fatal(err)
 		}
diff --git a/src/path/filepath/path_windows.go b/src/path/filepath/path_windows.go
index d53f87f1..d0eb42c5 100644
--- a/src/path/filepath/path_windows.go
+++ b/src/path/filepath/path_windows.go
@@ -1,3 +1,7 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
 package filepath
 
 import (
diff --git a/src/path/filepath/path_windows_test.go b/src/path/filepath/path_windows_test.go
index 2862f390..d60903f6 100644
--- a/src/path/filepath/path_windows_test.go
+++ b/src/path/filepath/path_windows_test.go
@@ -13,8 +13,8 @@ import (
 	"os"
 	"os/exec"
 	"path/filepath"
-	"reflect"
 	"runtime/debug"
+	"slices"
 	"strings"
 	"testing"
 )
@@ -83,7 +83,7 @@ func testWinSplitListTestIsValid(t *testing.T, ti int, tt SplitListTest,
 		case err != nil:
 			t.Errorf("%d,%d: execution error %v\n%q", ti, i, err, out)
 			return
-		case !reflect.DeepEqual(out, exp):
+		case !slices.Equal(out, exp):
 			t.Errorf("%d,%d: expected %#q, got %#q", ti, i, exp, out)
 			return
 		default:
@@ -408,12 +408,7 @@ func TestToNorm(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	defer func() {
-		err := os.Chdir(cwd)
-		if err != nil {
-			t.Fatal(err)
-		}
-	}()
+	t.Chdir(".") // Ensure cwd is restored after the test.
 
 	tmpVol := filepath.VolumeName(ctmp)
 	if len(tmpVol) != 2 {
diff --git a/src/plugin/plugin.go b/src/plugin/plugin.go
index b4b1697b..a4ff694e 100644
--- a/src/plugin/plugin.go
+++ b/src/plugin/plugin.go
@@ -29,6 +29,10 @@
 //     macOS, making them unsuitable for applications intended to be
 //     portable.
 //
+//   - Plugins are poorly supported by the Go race detector. Even simple
+//     race conditions may not be automatically detected. See
+//     https://go.dev/issue/24245 for more information.
+//
 //   - Applications that use plugins may require careful configuration
 //     to ensure that the various parts of the program be made available
 //     in the correct location in the file system (or container image).
diff --git a/src/reflect/all_test.go b/src/reflect/all_test.go
index a57f17f8..b2f70c13 100644
--- a/src/reflect/all_test.go
+++ b/src/reflect/all_test.go
@@ -10,8 +10,9 @@ import (
 	"flag"
 	"fmt"
 	"go/token"
-	"internal/abi"
+	"internal/asan"
 	"internal/goarch"
+	"internal/goexperiment"
 	"internal/testenv"
 	"io"
 	"math"
@@ -22,6 +23,7 @@ import (
 	"reflect/internal/example1"
 	"reflect/internal/example2"
 	"runtime"
+	"runtime/debug"
 	"slices"
 	"strconv"
 	"strings"
@@ -32,8 +34,6 @@ import (
 	"unsafe"
 )
 
-const bucketCount = abi.MapBucketCount
-
 var sink any
 
 func TestBool(t *testing.T) {
@@ -1134,13 +1134,15 @@ var deepEqualTests = []DeepEqualTest{
 }
 
 func TestDeepEqual(t *testing.T) {
-	for _, test := range deepEqualTests {
-		if test.b == (self{}) {
-			test.b = test.a
-		}
-		if r := DeepEqual(test.a, test.b); r != test.eq {
-			t.Errorf("DeepEqual(%#v, %#v) = %v, want %v", test.a, test.b, r, test.eq)
-		}
+	for i, test := range deepEqualTests {
+		t.Run(fmt.Sprint(i), func(t *testing.T) {
+			if test.b == (self{}) {
+				test.b = test.a
+			}
+			if r := DeepEqual(test.a, test.b); r != test.eq {
+				t.Errorf("DeepEqual(%#v, %#v) = %v, want %v", test.a, test.b, r, test.eq)
+			}
+		})
 	}
 }
 
@@ -1273,6 +1275,14 @@ var deepEqualPerfTests = []struct {
 }
 
 func TestDeepEqualAllocs(t *testing.T) {
+	// TODO(prattmic): maps on stack
+	if goexperiment.SwissMap {
+		t.Skipf("Maps on stack not yet implemented")
+	}
+	if asan.Enabled {
+		t.Skip("test allocates more with -asan; see #70079")
+	}
+
 	for _, tt := range deepEqualPerfTests {
 		t.Run(ValueOf(tt.x).Type().String(), func(t *testing.T) {
 			got := testing.AllocsPerRun(100, func() {
@@ -3533,6 +3543,14 @@ func TestAllocations(t *testing.T) {
 			panic("wrong result")
 		}
 	})
+	if runtime.GOOS != "js" && runtime.GOOS != "wasip1" {
+		typ := TypeFor[struct{ f int }]()
+		noAlloc(t, 100, func(int) {
+			if typ.Field(0).Index[0] != 0 {
+				panic("wrong field index")
+			}
+		})
+	}
 }
 
 func TestSmallNegativeInt(t *testing.T) {
@@ -6291,6 +6309,32 @@ func TestMapOfGCKeys(t *testing.T) {
 	}
 }
 
+// Test assignment and access to a map with keys larger than word size.
+func TestMapOfGCBigKey(t *testing.T) {
+	type KV struct {
+		i int64
+		j int64
+	}
+
+	kvTyp := TypeFor[KV]()
+	mt := MapOf(kvTyp, kvTyp)
+
+	const n = 100
+	m := MakeMap(mt)
+	for i := 0; i < n; i++ {
+		kv := KV{int64(i), int64(i+1)}
+		m.SetMapIndex(ValueOf(kv), ValueOf(kv))
+	}
+
+	for i := 0; i < n; i++ {
+		kv := KV{int64(i), int64(i+1)}
+		elem := m.MapIndex(ValueOf(kv)).Interface().(KV)
+		if elem != kv {
+			t.Errorf("lost m[%v] = %v, want %v", kv, elem, kv)
+		}
+	}
+}
+
 func TestMapOfGCValues(t *testing.T) {
 	type T *uintptr
 	tt := TypeOf(T(nil))
@@ -6823,7 +6867,7 @@ func TestInvalid(t *testing.T) {
 }
 
 // Issue 8917.
-func TestLargeGCProg(t *testing.T) {
+func TestLarge(t *testing.T) {
 	fv := ValueOf(func([256]*byte) {})
 	fv.Call([]Value{ValueOf([256]*byte{})})
 }
@@ -6863,6 +6907,25 @@ func TestTypeFieldOutOfRangePanic(t *testing.T) {
 	}
 }
 
+func TestTypeFieldReadOnly(t *testing.T) {
+	if runtime.GOOS == "js" || runtime.GOOS == "wasip1" {
+		// This is OK because we don't use the optimization
+		// for js or wasip1.
+		t.Skip("test does not fault on GOOS=js")
+	}
+
+	// It's important that changing one StructField.Index
+	// value not affect other StructField.Index values.
+	// Right now StructField.Index is read-only;
+	// that saves allocations but is otherwise not important.
+	typ := TypeFor[struct{ f int }]()
+	f := typ.Field(0)
+	defer debug.SetPanicOnFault(debug.SetPanicOnFault(true))
+	shouldPanic("", func() {
+		f.Index[0] = 1
+	})
+}
+
 // Issue 9179.
 func TestCallGC(t *testing.T) {
 	f := func(a, b, c, d, e string) {
@@ -7144,60 +7207,61 @@ func verifyGCBitsSlice(t *testing.T, typ Type, cap int, bits []byte) {
 	t.Errorf("line %d: heapBits incorrect for make(%v, 0, %v)\nhave %v\nwant %v", line, typ, cap, heapBits, bits)
 }
 
-func TestGCBits(t *testing.T) {
-	verifyGCBits(t, TypeOf((*byte)(nil)), []byte{1})
+// Building blocks for types seen by the compiler (like [2]Xscalar).
+// The compiler will create the type structures for the derived types,
+// including their GC metadata.
+type Xscalar struct{ x uintptr }
+type Xptr struct{ x *byte }
+type Xptrscalar struct {
+	*byte
+	uintptr
+}
+type Xscalarptr struct {
+	uintptr
+	*byte
+}
+type Xbigptrscalar struct {
+	_ [100]*byte
+	_ [100]uintptr
+}
 
-	// Building blocks for types seen by the compiler (like [2]Xscalar).
-	// The compiler will create the type structures for the derived types,
-	// including their GC metadata.
-	type Xscalar struct{ x uintptr }
-	type Xptr struct{ x *byte }
-	type Xptrscalar struct {
+var Tscalar, Tint64, Tptr, Tscalarptr, Tptrscalar, Tbigptrscalar Type
+
+func init() {
+	// Building blocks for types constructed by reflect.
+	// This code is in a separate block so that code below
+	// cannot accidentally refer to these.
+	// The compiler must NOT see types derived from these
+	// (for example, [2]Scalar must NOT appear in the program),
+	// or else reflect will use it instead of having to construct one.
+	// The goal is to test the construction.
+	type Scalar struct{ x uintptr }
+	type Ptr struct{ x *byte }
+	type Ptrscalar struct {
 		*byte
 		uintptr
 	}
-	type Xscalarptr struct {
+	type Scalarptr struct {
 		uintptr
 		*byte
 	}
-	type Xbigptrscalar struct {
+	type Bigptrscalar struct {
 		_ [100]*byte
 		_ [100]uintptr
 	}
+	type Int64 int64
+	Tscalar = TypeOf(Scalar{})
+	Tint64 = TypeOf(Int64(0))
+	Tptr = TypeOf(Ptr{})
+	Tscalarptr = TypeOf(Scalarptr{})
+	Tptrscalar = TypeOf(Ptrscalar{})
+	Tbigptrscalar = TypeOf(Bigptrscalar{})
+}
 
-	var Tscalar, Tint64, Tptr, Tscalarptr, Tptrscalar, Tbigptrscalar Type
-	{
-		// Building blocks for types constructed by reflect.
-		// This code is in a separate block so that code below
-		// cannot accidentally refer to these.
-		// The compiler must NOT see types derived from these
-		// (for example, [2]Scalar must NOT appear in the program),
-		// or else reflect will use it instead of having to construct one.
-		// The goal is to test the construction.
-		type Scalar struct{ x uintptr }
-		type Ptr struct{ x *byte }
-		type Ptrscalar struct {
-			*byte
-			uintptr
-		}
-		type Scalarptr struct {
-			uintptr
-			*byte
-		}
-		type Bigptrscalar struct {
-			_ [100]*byte
-			_ [100]uintptr
-		}
-		type Int64 int64
-		Tscalar = TypeOf(Scalar{})
-		Tint64 = TypeOf(Int64(0))
-		Tptr = TypeOf(Ptr{})
-		Tscalarptr = TypeOf(Scalarptr{})
-		Tptrscalar = TypeOf(Ptrscalar{})
-		Tbigptrscalar = TypeOf(Bigptrscalar{})
-	}
+var empty = []byte{}
 
-	empty := []byte{}
+func TestGCBits(t *testing.T) {
+	verifyGCBits(t, TypeOf((*byte)(nil)), []byte{1})
 
 	verifyGCBits(t, TypeOf(Xscalar{}), empty)
 	verifyGCBits(t, Tscalar, empty)
@@ -7277,47 +7341,7 @@ func TestGCBits(t *testing.T) {
 	verifyGCBits(t, TypeOf(([][10000]Xscalar)(nil)), lit(1))
 	verifyGCBits(t, SliceOf(ArrayOf(10000, Tscalar)), lit(1))
 
-	hdr := make([]byte, bucketCount/goarch.PtrSize)
-
-	verifyMapBucket := func(t *testing.T, k, e Type, m any, want []byte) {
-		verifyGCBits(t, MapBucketOf(k, e), want)
-		verifyGCBits(t, CachedBucketOf(TypeOf(m)), want)
-	}
-	verifyMapBucket(t,
-		Tscalar, Tptr,
-		map[Xscalar]Xptr(nil),
-		join(hdr, rep(bucketCount, lit(0)), rep(bucketCount, lit(1)), lit(1)))
-	verifyMapBucket(t,
-		Tscalarptr, Tptr,
-		map[Xscalarptr]Xptr(nil),
-		join(hdr, rep(bucketCount, lit(0, 1)), rep(bucketCount, lit(1)), lit(1)))
-	verifyMapBucket(t, Tint64, Tptr,
-		map[int64]Xptr(nil),
-		join(hdr, rep(bucketCount, rep(8/goarch.PtrSize, lit(0))), rep(bucketCount, lit(1)), lit(1)))
-	verifyMapBucket(t,
-		Tscalar, Tscalar,
-		map[Xscalar]Xscalar(nil),
-		empty)
-	verifyMapBucket(t,
-		ArrayOf(2, Tscalarptr), ArrayOf(3, Tptrscalar),
-		map[[2]Xscalarptr][3]Xptrscalar(nil),
-		join(hdr, rep(bucketCount*2, lit(0, 1)), rep(bucketCount*3, lit(1, 0)), lit(1)))
-	verifyMapBucket(t,
-		ArrayOf(64/goarch.PtrSize, Tscalarptr), ArrayOf(64/goarch.PtrSize, Tptrscalar),
-		map[[64 / goarch.PtrSize]Xscalarptr][64 / goarch.PtrSize]Xptrscalar(nil),
-		join(hdr, rep(bucketCount*64/goarch.PtrSize, lit(0, 1)), rep(bucketCount*64/goarch.PtrSize, lit(1, 0)), lit(1)))
-	verifyMapBucket(t,
-		ArrayOf(64/goarch.PtrSize+1, Tscalarptr), ArrayOf(64/goarch.PtrSize, Tptrscalar),
-		map[[64/goarch.PtrSize + 1]Xscalarptr][64 / goarch.PtrSize]Xptrscalar(nil),
-		join(hdr, rep(bucketCount, lit(1)), rep(bucketCount*64/goarch.PtrSize, lit(1, 0)), lit(1)))
-	verifyMapBucket(t,
-		ArrayOf(64/goarch.PtrSize, Tscalarptr), ArrayOf(64/goarch.PtrSize+1, Tptrscalar),
-		map[[64 / goarch.PtrSize]Xscalarptr][64/goarch.PtrSize + 1]Xptrscalar(nil),
-		join(hdr, rep(bucketCount*64/goarch.PtrSize, lit(0, 1)), rep(bucketCount, lit(1)), lit(1)))
-	verifyMapBucket(t,
-		ArrayOf(64/goarch.PtrSize+1, Tscalarptr), ArrayOf(64/goarch.PtrSize+1, Tptrscalar),
-		map[[64/goarch.PtrSize + 1]Xscalarptr][64/goarch.PtrSize + 1]Xptrscalar(nil),
-		join(hdr, rep(bucketCount, lit(1)), rep(bucketCount, lit(1)), lit(1)))
+	testGCBitsMap(t)
 }
 
 func rep(n int, b []byte) []byte { return bytes.Repeat(b, n) }
@@ -7359,6 +7383,9 @@ func TestPtrToMethods(t *testing.T) {
 }
 
 func TestMapAlloc(t *testing.T) {
+	if asan.Enabled {
+		t.Skip("test allocates more with -asan; see #70079")
+	}
 	m := ValueOf(make(map[int]int, 10))
 	k := ValueOf(5)
 	v := ValueOf(7)
@@ -7389,6 +7416,9 @@ func TestMapAlloc(t *testing.T) {
 }
 
 func TestChanAlloc(t *testing.T) {
+	if asan.Enabled {
+		t.Skip("test allocates more with -asan; see #70079")
+	}
 	// Note: for a chan int, the return Value must be allocated, so we
 	// use a chan *int instead.
 	c := ValueOf(make(chan *int, 1))
@@ -7751,11 +7781,14 @@ func TestMapIterReset(t *testing.T) {
 	}
 
 	// Reset should not allocate.
+	//
+	// Except with -asan, where there are additional allocations.
+	// See #70079.
 	n := int(testing.AllocsPerRun(10, func() {
 		iter.Reset(ValueOf(m2))
 		iter.Reset(Value{})
 	}))
-	if n > 0 {
+	if !asan.Enabled && n > 0 {
 		t.Errorf("MapIter.Reset allocated %d times", n)
 	}
 }
@@ -8603,3 +8636,48 @@ func TestSliceAt(t *testing.T) {
 	// _ = SliceAt(typ, unsafe.Pointer(last), 1)
 	shouldPanic("", func() { _ = SliceAt(typ, unsafe.Pointer(last), 2) })
 }
+
+// Test that maps created with MapOf properly updates keys on overwrite as
+// expected (i.e., it sets the key update flag in the map).
+//
+// This test is based on runtime.TestNegativeZero.
+func TestMapOfKeyUpdate(t *testing.T) {
+	m := MakeMap(MapOf(TypeFor[float64](), TypeFor[bool]()))
+
+	zero := float64(0.0)
+	negZero := math.Copysign(zero, -1.0)
+
+	m.SetMapIndex(ValueOf(zero), ValueOf(true))
+	m.SetMapIndex(ValueOf(negZero), ValueOf(true))
+
+	if m.Len() != 1 {
+		t.Errorf("map length got %d want 1", m.Len())
+	}
+
+	iter := m.MapRange()
+	for iter.Next() {
+		k := iter.Key().Float()
+		if math.Copysign(1.0, k) > 0 {
+			t.Errorf("map key %f has positive sign", k)
+		}
+	}
+}
+
+// Test that maps created with MapOf properly panic on unhashable keys, even if
+// the map is empty. (i.e., it sets the hash might panic flag in the map).
+//
+// This test is a simplified version of runtime.TestEmptyMapWithInterfaceKey
+// for reflect.
+func TestMapOfKeyPanic(t *testing.T) {
+	defer func() {
+		r := recover()
+		if r == nil {
+			t.Errorf("didn't panic")
+		}
+	}()
+
+	m := MakeMap(MapOf(TypeFor[any](), TypeFor[bool]()))
+
+	var slice []int
+	m.MapIndex(ValueOf(slice))
+}
diff --git a/src/reflect/deepequal.go b/src/reflect/deepequal.go
index 502ea9f1..041c3e1f 100644
--- a/src/reflect/deepequal.go
+++ b/src/reflect/deepequal.go
@@ -41,7 +41,7 @@ func deepValueEqual(v1, v2 Value, visited map[visit]bool) bool {
 		case Pointer:
 			if !v1.typ().Pointers() {
 				// not-in-heap pointers can't be cyclic.
-				// At least, all of our current uses of runtime/internal/sys.NotInHeap
+				// At least, all of our current uses of internal/runtime/sys.NotInHeap
 				// have that property. The runtime ones aren't cyclic (and we don't use
 				// DeepEqual on them anyway), and the cgo-generated ones are
 				// all empty structs.
diff --git a/src/reflect/export_noswiss_test.go b/src/reflect/export_noswiss_test.go
new file mode 100644
index 00000000..34e5e920
--- /dev/null
+++ b/src/reflect/export_noswiss_test.go
@@ -0,0 +1,25 @@
+// Copyright 2024 Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build !goexperiment.swissmap
+
+package reflect
+
+import (
+	"internal/abi"
+	"unsafe"
+)
+
+func MapBucketOf(x, y Type) Type {
+	return toType(bucketOf(x.common(), y.common()))
+}
+
+func CachedBucketOf(m Type) Type {
+	t := m.(*rtype)
+	if Kind(t.t.Kind_&abi.KindMask) != Map {
+		panic("not map")
+	}
+	tt := (*mapType)(unsafe.Pointer(t))
+	return toType(tt.Bucket)
+}
diff --git a/src/reflect/export_swiss_test.go b/src/reflect/export_swiss_test.go
new file mode 100644
index 00000000..ac3cd0ad
--- /dev/null
+++ b/src/reflect/export_swiss_test.go
@@ -0,0 +1,12 @@
+// Copyright 2024 Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build goexperiment.swissmap
+
+package reflect
+
+func MapGroupOf(x, y Type) Type {
+	grp, _ := groupAndSlotOf(x, y)
+	return grp
+}
diff --git a/src/reflect/export_test.go b/src/reflect/export_test.go
index 30a0e823..eedd063f 100644
--- a/src/reflect/export_test.go
+++ b/src/reflect/export_test.go
@@ -58,9 +58,6 @@ func FuncLayout(t Type, rcvr Type) (frametype Type, argSize, retOffset uintptr,
 		inReg = append(inReg, bool2byte(abid.inRegPtrs.Get(i)))
 		outReg = append(outReg, bool2byte(abid.outRegPtrs.Get(i)))
 	}
-	if ft.Kind_&abi.KindGCProg != 0 {
-		panic("can't handle gc programs")
-	}
 
 	// Expand frame type's GC bitmap into byte-map.
 	ptrs = ft.Pointers()
@@ -91,19 +88,6 @@ var GCBits = gcbits
 
 func gcbits(any) []byte // provided by runtime
 
-func MapBucketOf(x, y Type) Type {
-	return toType(bucketOf(x.common(), y.common()))
-}
-
-func CachedBucketOf(m Type) Type {
-	t := m.(*rtype)
-	if Kind(t.t.Kind_&abi.KindMask) != Map {
-		panic("not map")
-	}
-	tt := (*mapType)(unsafe.Pointer(t))
-	return toType(tt.Bucket)
-}
-
 type EmbedWithUnexpMeth struct{}
 
 func (EmbedWithUnexpMeth) f() {}
diff --git a/src/reflect/iter_test.go b/src/reflect/iter_test.go
index 9b78fcf7..00ae521a 100644
--- a/src/reflect/iter_test.go
+++ b/src/reflect/iter_test.go
@@ -114,10 +114,10 @@ func TestValueSeq(t *testing.T) {
 		}},
 		{"string", ValueOf("12语言"), func(t *testing.T, s iter.Seq[Value]) {
 			i := int64(0)
-			indexs := []int64{0, 1, 2, 5}
+			indexes := []int64{0, 1, 2, 5}
 			for v := range s {
-				if v.Int() != indexs[i] {
-					t.Fatalf("got %d, want %d", v.Int(), indexs[i])
+				if v.Int() != indexes[i] {
+					t.Fatalf("got %d, want %d", v.Int(), indexes[i])
 				}
 				i++
 			}
@@ -126,14 +126,12 @@ func TestValueSeq(t *testing.T) {
 			}
 		}},
 		{"map[string]int", ValueOf(m), func(t *testing.T, s iter.Seq[Value]) {
-			i := int64(0)
 			copy := maps.Clone(m)
 			for v := range s {
 				if _, ok := copy[v.String()]; !ok {
 					t.Fatalf("unexpected %v", v.Interface())
 				}
 				delete(copy, v.String())
-				i++
 			}
 			if len(copy) != 0 {
 				t.Fatalf("should loop four times")
@@ -240,11 +238,10 @@ func TestValueSeq2(t *testing.T) {
 			}
 		}},
 		{"string", ValueOf("12语言"), func(t *testing.T, s iter.Seq2[Value, Value]) {
-			i := int64(0)
-			str := "12语言"
 			next, stop := iter.Pull2(s)
 			defer stop()
-			for j, s := range str {
+			i := int64(0)
+			for j, s := range "12语言" {
 				v1, v2, ok := next()
 				if !ok {
 					t.Fatalf("should loop four times")
diff --git a/src/reflect/map_noswiss.go b/src/reflect/map_noswiss.go
new file mode 100644
index 00000000..19696a4f
--- /dev/null
+++ b/src/reflect/map_noswiss.go
@@ -0,0 +1,484 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build !goexperiment.swissmap
+
+package reflect
+
+import (
+	"internal/abi"
+	"internal/goarch"
+	"unsafe"
+)
+
+// mapType represents a map type.
+type mapType struct {
+	abi.OldMapType
+}
+
+// Pushed from runtime.
+
+//go:noescape
+func mapiterinit(t *abi.Type, m unsafe.Pointer, it *hiter)
+
+//go:noescape
+func mapiternext(it *hiter)
+
+func (t *rtype) Key() Type {
+	if t.Kind() != Map {
+		panic("reflect: Key of non-map type " + t.String())
+	}
+	tt := (*mapType)(unsafe.Pointer(t))
+	return toType(tt.Key)
+}
+
+// MapOf returns the map type with the given key and element types.
+// For example, if k represents int and e represents string,
+// MapOf(k, e) represents map[int]string.
+//
+// If the key type is not a valid map key type (that is, if it does
+// not implement Go's == operator), MapOf panics.
+func MapOf(key, elem Type) Type {
+	ktyp := key.common()
+	etyp := elem.common()
+
+	if ktyp.Equal == nil {
+		panic("reflect.MapOf: invalid key type " + stringFor(ktyp))
+	}
+
+	// Look in cache.
+	ckey := cacheKey{Map, ktyp, etyp, 0}
+	if mt, ok := lookupCache.Load(ckey); ok {
+		return mt.(Type)
+	}
+
+	// Look in known types.
+	s := "map[" + stringFor(ktyp) + "]" + stringFor(etyp)
+	for _, tt := range typesByString(s) {
+		mt := (*mapType)(unsafe.Pointer(tt))
+		if mt.Key == ktyp && mt.Elem == etyp {
+			ti, _ := lookupCache.LoadOrStore(ckey, toRType(tt))
+			return ti.(Type)
+		}
+	}
+
+	// Make a map type.
+	// Note: flag values must match those used in the TMAP case
+	// in ../cmd/compile/internal/reflectdata/reflect.go:writeType.
+	var imap any = (map[unsafe.Pointer]unsafe.Pointer)(nil)
+	mt := **(**mapType)(unsafe.Pointer(&imap))
+	mt.Str = resolveReflectName(newName(s, "", false, false))
+	mt.TFlag = 0
+	mt.Hash = fnv1(etyp.Hash, 'm', byte(ktyp.Hash>>24), byte(ktyp.Hash>>16), byte(ktyp.Hash>>8), byte(ktyp.Hash))
+	mt.Key = ktyp
+	mt.Elem = etyp
+	mt.Bucket = bucketOf(ktyp, etyp)
+	mt.Hasher = func(p unsafe.Pointer, seed uintptr) uintptr {
+		return typehash(ktyp, p, seed)
+	}
+	mt.Flags = 0
+	if ktyp.Size_ > abi.OldMapMaxKeyBytes {
+		mt.KeySize = uint8(goarch.PtrSize)
+		mt.Flags |= 1 // indirect key
+	} else {
+		mt.KeySize = uint8(ktyp.Size_)
+	}
+	if etyp.Size_ > abi.OldMapMaxElemBytes {
+		mt.ValueSize = uint8(goarch.PtrSize)
+		mt.Flags |= 2 // indirect value
+	} else {
+		mt.ValueSize = uint8(etyp.Size_)
+	}
+	mt.BucketSize = uint16(mt.Bucket.Size_)
+	if isReflexive(ktyp) {
+		mt.Flags |= 4
+	}
+	if needKeyUpdate(ktyp) {
+		mt.Flags |= 8
+	}
+	if hashMightPanic(ktyp) {
+		mt.Flags |= 16
+	}
+	mt.PtrToThis = 0
+
+	ti, _ := lookupCache.LoadOrStore(ckey, toRType(&mt.Type))
+	return ti.(Type)
+}
+
+func bucketOf(ktyp, etyp *abi.Type) *abi.Type {
+	if ktyp.Size_ > abi.OldMapMaxKeyBytes {
+		ktyp = ptrTo(ktyp)
+	}
+	if etyp.Size_ > abi.OldMapMaxElemBytes {
+		etyp = ptrTo(etyp)
+	}
+
+	// Prepare GC data if any.
+	// A bucket is at most bucketSize*(1+maxKeySize+maxValSize)+ptrSize bytes,
+	// or 2064 bytes, or 258 pointer-size words, or 33 bytes of pointer bitmap.
+	// Note that since the key and value are known to be <= 128 bytes,
+	// they're guaranteed to have bitmaps instead of GC programs.
+	var gcdata *byte
+	var ptrdata uintptr
+
+	size := abi.OldMapBucketCount*(1+ktyp.Size_+etyp.Size_) + goarch.PtrSize
+	if size&uintptr(ktyp.Align_-1) != 0 || size&uintptr(etyp.Align_-1) != 0 {
+		panic("reflect: bad size computation in MapOf")
+	}
+
+	if ktyp.Pointers() || etyp.Pointers() {
+		nptr := (abi.OldMapBucketCount*(1+ktyp.Size_+etyp.Size_) + goarch.PtrSize) / goarch.PtrSize
+		n := (nptr + 7) / 8
+
+		// Runtime needs pointer masks to be a multiple of uintptr in size.
+		n = (n + goarch.PtrSize - 1) &^ (goarch.PtrSize - 1)
+		mask := make([]byte, n)
+		base := uintptr(abi.OldMapBucketCount / goarch.PtrSize)
+
+		if ktyp.Pointers() {
+			emitGCMask(mask, base, ktyp, abi.OldMapBucketCount)
+		}
+		base += abi.OldMapBucketCount * ktyp.Size_ / goarch.PtrSize
+
+		if etyp.Pointers() {
+			emitGCMask(mask, base, etyp, abi.OldMapBucketCount)
+		}
+		base += abi.OldMapBucketCount * etyp.Size_ / goarch.PtrSize
+
+		word := base
+		mask[word/8] |= 1 << (word % 8)
+		gcdata = &mask[0]
+		ptrdata = (word + 1) * goarch.PtrSize
+
+		// overflow word must be last
+		if ptrdata != size {
+			panic("reflect: bad layout computation in MapOf")
+		}
+	}
+
+	b := &abi.Type{
+		Align_:   goarch.PtrSize,
+		Size_:    size,
+		Kind_:    abi.Struct,
+		PtrBytes: ptrdata,
+		GCData:   gcdata,
+	}
+	s := "bucket(" + stringFor(ktyp) + "," + stringFor(etyp) + ")"
+	b.Str = resolveReflectName(newName(s, "", false, false))
+	return b
+}
+
+var stringType = rtypeOf("")
+
+// MapIndex returns the value associated with key in the map v.
+// It panics if v's Kind is not [Map].
+// It returns the zero Value if key is not found in the map or if v represents a nil map.
+// As in Go, the key's value must be assignable to the map's key type.
+func (v Value) MapIndex(key Value) Value {
+	v.mustBe(Map)
+	tt := (*mapType)(unsafe.Pointer(v.typ()))
+
+	// Do not require key to be exported, so that DeepEqual
+	// and other programs can use all the keys returned by
+	// MapKeys as arguments to MapIndex. If either the map
+	// or the key is unexported, though, the result will be
+	// considered unexported. This is consistent with the
+	// behavior for structs, which allow read but not write
+	// of unexported fields.
+
+	var e unsafe.Pointer
+	if (tt.Key == stringType || key.kind() == String) && tt.Key == key.typ() && tt.Elem.Size() <= abi.OldMapMaxElemBytes {
+		k := *(*string)(key.ptr)
+		e = mapaccess_faststr(v.typ(), v.pointer(), k)
+	} else {
+		key = key.assignTo("reflect.Value.MapIndex", tt.Key, nil)
+		var k unsafe.Pointer
+		if key.flag&flagIndir != 0 {
+			k = key.ptr
+		} else {
+			k = unsafe.Pointer(&key.ptr)
+		}
+		e = mapaccess(v.typ(), v.pointer(), k)
+	}
+	if e == nil {
+		return Value{}
+	}
+	typ := tt.Elem
+	fl := (v.flag | key.flag).ro()
+	fl |= flag(typ.Kind())
+	return copyVal(typ, fl, e)
+}
+
+// MapKeys returns a slice containing all the keys present in the map,
+// in unspecified order.
+// It panics if v's Kind is not [Map].
+// It returns an empty slice if v represents a nil map.
+func (v Value) MapKeys() []Value {
+	v.mustBe(Map)
+	tt := (*mapType)(unsafe.Pointer(v.typ()))
+	keyType := tt.Key
+
+	fl := v.flag.ro() | flag(keyType.Kind())
+
+	m := v.pointer()
+	mlen := int(0)
+	if m != nil {
+		mlen = maplen(m)
+	}
+	var it hiter
+	mapiterinit(v.typ(), m, &it)
+	a := make([]Value, mlen)
+	var i int
+	for i = 0; i < len(a); i++ {
+		key := it.key
+		if key == nil {
+			// Someone deleted an entry from the map since we
+			// called maplen above. It's a data race, but nothing
+			// we can do about it.
+			break
+		}
+		a[i] = copyVal(keyType, fl, key)
+		mapiternext(&it)
+	}
+	return a[:i]
+}
+
+// hiter's structure matches runtime.hiter's structure.
+// Having a clone here allows us to embed a map iterator
+// inside type MapIter so that MapIters can be re-used
+// without doing any allocations.
+type hiter struct {
+	key         unsafe.Pointer
+	elem        unsafe.Pointer
+	t           unsafe.Pointer
+	h           unsafe.Pointer
+	buckets     unsafe.Pointer
+	bptr        unsafe.Pointer
+	overflow    *[]unsafe.Pointer
+	oldoverflow *[]unsafe.Pointer
+	startBucket uintptr
+	offset      uint8
+	wrapped     bool
+	B           uint8
+	i           uint8
+	bucket      uintptr
+	checkBucket uintptr
+	clearSeq    uint64
+}
+
+func (h *hiter) initialized() bool {
+	return h.t != nil
+}
+
+// A MapIter is an iterator for ranging over a map.
+// See [Value.MapRange].
+type MapIter struct {
+	m     Value
+	hiter hiter
+}
+
+// Key returns the key of iter's current map entry.
+func (iter *MapIter) Key() Value {
+	if !iter.hiter.initialized() {
+		panic("MapIter.Key called before Next")
+	}
+	iterkey := iter.hiter.key
+	if iterkey == nil {
+		panic("MapIter.Key called on exhausted iterator")
+	}
+
+	t := (*mapType)(unsafe.Pointer(iter.m.typ()))
+	ktype := t.Key
+	return copyVal(ktype, iter.m.flag.ro()|flag(ktype.Kind()), iterkey)
+}
+
+// SetIterKey assigns to v the key of iter's current map entry.
+// It is equivalent to v.Set(iter.Key()), but it avoids allocating a new Value.
+// As in Go, the key must be assignable to v's type and
+// must not be derived from an unexported field.
+// It panics if [Value.CanSet] returns false.
+func (v Value) SetIterKey(iter *MapIter) {
+	if !iter.hiter.initialized() {
+		panic("reflect: Value.SetIterKey called before Next")
+	}
+	iterkey := iter.hiter.key
+	if iterkey == nil {
+		panic("reflect: Value.SetIterKey called on exhausted iterator")
+	}
+
+	v.mustBeAssignable()
+	var target unsafe.Pointer
+	if v.kind() == Interface {
+		target = v.ptr
+	}
+
+	t := (*mapType)(unsafe.Pointer(iter.m.typ()))
+	ktype := t.Key
+
+	iter.m.mustBeExported() // do not let unexported m leak
+	key := Value{ktype, iterkey, iter.m.flag | flag(ktype.Kind()) | flagIndir}
+	key = key.assignTo("reflect.MapIter.SetKey", v.typ(), target)
+	typedmemmove(v.typ(), v.ptr, key.ptr)
+}
+
+// Value returns the value of iter's current map entry.
+func (iter *MapIter) Value() Value {
+	if !iter.hiter.initialized() {
+		panic("MapIter.Value called before Next")
+	}
+	iterelem := iter.hiter.elem
+	if iterelem == nil {
+		panic("MapIter.Value called on exhausted iterator")
+	}
+
+	t := (*mapType)(unsafe.Pointer(iter.m.typ()))
+	vtype := t.Elem
+	return copyVal(vtype, iter.m.flag.ro()|flag(vtype.Kind()), iterelem)
+}
+
+// SetIterValue assigns to v the value of iter's current map entry.
+// It is equivalent to v.Set(iter.Value()), but it avoids allocating a new Value.
+// As in Go, the value must be assignable to v's type and
+// must not be derived from an unexported field.
+// It panics if [Value.CanSet] returns false.
+func (v Value) SetIterValue(iter *MapIter) {
+	if !iter.hiter.initialized() {
+		panic("reflect: Value.SetIterValue called before Next")
+	}
+	iterelem := iter.hiter.elem
+	if iterelem == nil {
+		panic("reflect: Value.SetIterValue called on exhausted iterator")
+	}
+
+	v.mustBeAssignable()
+	var target unsafe.Pointer
+	if v.kind() == Interface {
+		target = v.ptr
+	}
+
+	t := (*mapType)(unsafe.Pointer(iter.m.typ()))
+	vtype := t.Elem
+
+	iter.m.mustBeExported() // do not let unexported m leak
+	elem := Value{vtype, iterelem, iter.m.flag | flag(vtype.Kind()) | flagIndir}
+	elem = elem.assignTo("reflect.MapIter.SetValue", v.typ(), target)
+	typedmemmove(v.typ(), v.ptr, elem.ptr)
+}
+
+// Next advances the map iterator and reports whether there is another
+// entry. It returns false when iter is exhausted; subsequent
+// calls to [MapIter.Key], [MapIter.Value], or [MapIter.Next] will panic.
+func (iter *MapIter) Next() bool {
+	if !iter.m.IsValid() {
+		panic("MapIter.Next called on an iterator that does not have an associated map Value")
+	}
+	if !iter.hiter.initialized() {
+		mapiterinit(iter.m.typ(), iter.m.pointer(), &iter.hiter)
+	} else {
+		if iter.hiter.key == nil {
+			panic("MapIter.Next called on exhausted iterator")
+		}
+		mapiternext(&iter.hiter)
+	}
+	return iter.hiter.key != nil
+}
+
+// Reset modifies iter to iterate over v.
+// It panics if v's Kind is not [Map] and v is not the zero Value.
+// Reset(Value{}) causes iter to not to refer to any map,
+// which may allow the previously iterated-over map to be garbage collected.
+func (iter *MapIter) Reset(v Value) {
+	if v.IsValid() {
+		v.mustBe(Map)
+	}
+	iter.m = v
+	iter.hiter = hiter{}
+}
+
+// MapRange returns a range iterator for a map.
+// It panics if v's Kind is not [Map].
+//
+// Call [MapIter.Next] to advance the iterator, and [MapIter.Key]/[MapIter.Value] to access each entry.
+// [MapIter.Next] returns false when the iterator is exhausted.
+// MapRange follows the same iteration semantics as a range statement.
+//
+// Example:
+//
+//	iter := reflect.ValueOf(m).MapRange()
+//	for iter.Next() {
+//		k := iter.Key()
+//		v := iter.Value()
+//		...
+//	}
+func (v Value) MapRange() *MapIter {
+	// This is inlinable to take advantage of "function outlining".
+	// The allocation of MapIter can be stack allocated if the caller
+	// does not allow it to escape.
+	// See https://blog.filippo.io/efficient-go-apis-with-the-inliner/
+	if v.kind() != Map {
+		v.panicNotMap()
+	}
+	return &MapIter{m: v}
+}
+
+// SetMapIndex sets the element associated with key in the map v to elem.
+// It panics if v's Kind is not [Map].
+// If elem is the zero Value, SetMapIndex deletes the key from the map.
+// Otherwise if v holds a nil map, SetMapIndex will panic.
+// As in Go, key's elem must be assignable to the map's key type,
+// and elem's value must be assignable to the map's elem type.
+func (v Value) SetMapIndex(key, elem Value) {
+	v.mustBe(Map)
+	v.mustBeExported()
+	key.mustBeExported()
+	tt := (*mapType)(unsafe.Pointer(v.typ()))
+
+	if (tt.Key == stringType || key.kind() == String) && tt.Key == key.typ() && tt.Elem.Size() <= abi.OldMapMaxElemBytes {
+		k := *(*string)(key.ptr)
+		if elem.typ() == nil {
+			mapdelete_faststr(v.typ(), v.pointer(), k)
+			return
+		}
+		elem.mustBeExported()
+		elem = elem.assignTo("reflect.Value.SetMapIndex", tt.Elem, nil)
+		var e unsafe.Pointer
+		if elem.flag&flagIndir != 0 {
+			e = elem.ptr
+		} else {
+			e = unsafe.Pointer(&elem.ptr)
+		}
+		mapassign_faststr(v.typ(), v.pointer(), k, e)
+		return
+	}
+
+	key = key.assignTo("reflect.Value.SetMapIndex", tt.Key, nil)
+	var k unsafe.Pointer
+	if key.flag&flagIndir != 0 {
+		k = key.ptr
+	} else {
+		k = unsafe.Pointer(&key.ptr)
+	}
+	if elem.typ() == nil {
+		mapdelete(v.typ(), v.pointer(), k)
+		return
+	}
+	elem.mustBeExported()
+	elem = elem.assignTo("reflect.Value.SetMapIndex", tt.Elem, nil)
+	var e unsafe.Pointer
+	if elem.flag&flagIndir != 0 {
+		e = elem.ptr
+	} else {
+		e = unsafe.Pointer(&elem.ptr)
+	}
+	mapassign(v.typ(), v.pointer(), k, e)
+}
+
+// Force slow panicking path not inlined, so it won't add to the
+// inlining budget of the caller.
+// TODO: undo when the inliner is no longer bottom-up only.
+//
+//go:noinline
+func (f flag) panicNotMap() {
+	f.mustBe(Map)
+}
diff --git a/src/reflect/map_noswiss_test.go b/src/reflect/map_noswiss_test.go
new file mode 100644
index 00000000..52fcf895
--- /dev/null
+++ b/src/reflect/map_noswiss_test.go
@@ -0,0 +1,60 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build !goexperiment.swissmap
+
+package reflect_test
+
+import (
+	"internal/abi"
+	"internal/goarch"
+	. "reflect"
+	"testing"
+)
+
+func testGCBitsMap(t *testing.T) {
+	const bucketCount = abi.OldMapBucketCount
+
+	hdr := make([]byte, bucketCount/goarch.PtrSize)
+
+	verifyMapBucket := func(t *testing.T, k, e Type, m any, want []byte) {
+		verifyGCBits(t, MapBucketOf(k, e), want)
+		verifyGCBits(t, CachedBucketOf(TypeOf(m)), want)
+	}
+	verifyMapBucket(t,
+		Tscalar, Tptr,
+		map[Xscalar]Xptr(nil),
+		join(hdr, rep(bucketCount, lit(0)), rep(bucketCount, lit(1)), lit(1)))
+	verifyMapBucket(t,
+		Tscalarptr, Tptr,
+		map[Xscalarptr]Xptr(nil),
+		join(hdr, rep(bucketCount, lit(0, 1)), rep(bucketCount, lit(1)), lit(1)))
+	verifyMapBucket(t, Tint64, Tptr,
+		map[int64]Xptr(nil),
+		join(hdr, rep(bucketCount, rep(8/goarch.PtrSize, lit(0))), rep(bucketCount, lit(1)), lit(1)))
+	verifyMapBucket(t,
+		Tscalar, Tscalar,
+		map[Xscalar]Xscalar(nil),
+		empty)
+	verifyMapBucket(t,
+		ArrayOf(2, Tscalarptr), ArrayOf(3, Tptrscalar),
+		map[[2]Xscalarptr][3]Xptrscalar(nil),
+		join(hdr, rep(bucketCount*2, lit(0, 1)), rep(bucketCount*3, lit(1, 0)), lit(1)))
+	verifyMapBucket(t,
+		ArrayOf(64/goarch.PtrSize, Tscalarptr), ArrayOf(64/goarch.PtrSize, Tptrscalar),
+		map[[64 / goarch.PtrSize]Xscalarptr][64 / goarch.PtrSize]Xptrscalar(nil),
+		join(hdr, rep(bucketCount*64/goarch.PtrSize, lit(0, 1)), rep(bucketCount*64/goarch.PtrSize, lit(1, 0)), lit(1)))
+	verifyMapBucket(t,
+		ArrayOf(64/goarch.PtrSize+1, Tscalarptr), ArrayOf(64/goarch.PtrSize, Tptrscalar),
+		map[[64/goarch.PtrSize + 1]Xscalarptr][64 / goarch.PtrSize]Xptrscalar(nil),
+		join(hdr, rep(bucketCount, lit(1)), rep(bucketCount*64/goarch.PtrSize, lit(1, 0)), lit(1)))
+	verifyMapBucket(t,
+		ArrayOf(64/goarch.PtrSize, Tscalarptr), ArrayOf(64/goarch.PtrSize+1, Tptrscalar),
+		map[[64 / goarch.PtrSize]Xscalarptr][64/goarch.PtrSize + 1]Xptrscalar(nil),
+		join(hdr, rep(bucketCount*64/goarch.PtrSize, lit(0, 1)), rep(bucketCount, lit(1)), lit(1)))
+	verifyMapBucket(t,
+		ArrayOf(64/goarch.PtrSize+1, Tscalarptr), ArrayOf(64/goarch.PtrSize+1, Tptrscalar),
+		map[[64/goarch.PtrSize + 1]Xscalarptr][64/goarch.PtrSize + 1]Xptrscalar(nil),
+		join(hdr, rep(bucketCount, lit(1)), rep(bucketCount, lit(1)), lit(1)))
+}
diff --git a/src/reflect/map_swiss.go b/src/reflect/map_swiss.go
new file mode 100644
index 00000000..2eac51e5
--- /dev/null
+++ b/src/reflect/map_swiss.go
@@ -0,0 +1,460 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build goexperiment.swissmap
+
+package reflect
+
+import (
+	"internal/abi"
+	"internal/race"
+	"internal/runtime/maps"
+	"internal/runtime/sys"
+	"unsafe"
+)
+
+// mapType represents a map type.
+//
+// TODO(prattmic): Only used within this file, could be cleaned up.
+type mapType = abi.SwissMapType
+
+func (t *rtype) Key() Type {
+	if t.Kind() != Map {
+		panic("reflect: Key of non-map type " + t.String())
+	}
+	tt := (*mapType)(unsafe.Pointer(t))
+	return toType(tt.Key)
+}
+
+// MapOf returns the map type with the given key and element types.
+// For example, if k represents int and e represents string,
+// MapOf(k, e) represents map[int]string.
+//
+// If the key type is not a valid map key type (that is, if it does
+// not implement Go's == operator), MapOf panics.
+func MapOf(key, elem Type) Type {
+	ktyp := key.common()
+	etyp := elem.common()
+
+	if ktyp.Equal == nil {
+		panic("reflect.MapOf: invalid key type " + stringFor(ktyp))
+	}
+
+	// Look in cache.
+	ckey := cacheKey{Map, ktyp, etyp, 0}
+	if mt, ok := lookupCache.Load(ckey); ok {
+		return mt.(Type)
+	}
+
+	// Look in known types.
+	s := "map[" + stringFor(ktyp) + "]" + stringFor(etyp)
+	for _, tt := range typesByString(s) {
+		mt := (*mapType)(unsafe.Pointer(tt))
+		if mt.Key == ktyp && mt.Elem == etyp {
+			ti, _ := lookupCache.LoadOrStore(ckey, toRType(tt))
+			return ti.(Type)
+		}
+	}
+
+	group, slot := groupAndSlotOf(key, elem)
+
+	// Make a map type.
+	// Note: flag values must match those used in the TMAP case
+	// in ../cmd/compile/internal/reflectdata/reflect.go:writeType.
+	var imap any = (map[unsafe.Pointer]unsafe.Pointer)(nil)
+	mt := **(**mapType)(unsafe.Pointer(&imap))
+	mt.Str = resolveReflectName(newName(s, "", false, false))
+	mt.TFlag = 0
+	mt.Hash = fnv1(etyp.Hash, 'm', byte(ktyp.Hash>>24), byte(ktyp.Hash>>16), byte(ktyp.Hash>>8), byte(ktyp.Hash))
+	mt.Key = ktyp
+	mt.Elem = etyp
+	mt.Group = group.common()
+	mt.Hasher = func(p unsafe.Pointer, seed uintptr) uintptr {
+		return typehash(ktyp, p, seed)
+	}
+	mt.GroupSize = mt.Group.Size()
+	mt.SlotSize = slot.Size()
+	mt.ElemOff = slot.Field(1).Offset
+	mt.Flags = 0
+	if needKeyUpdate(ktyp) {
+		mt.Flags |= abi.SwissMapNeedKeyUpdate
+	}
+	if hashMightPanic(ktyp) {
+		mt.Flags |= abi.SwissMapHashMightPanic
+	}
+	if ktyp.Size_ > abi.SwissMapMaxKeyBytes {
+		mt.Flags |= abi.SwissMapIndirectKey
+	}
+	if etyp.Size_ > abi.SwissMapMaxKeyBytes {
+		mt.Flags |= abi.SwissMapIndirectElem
+	}
+	mt.PtrToThis = 0
+
+	ti, _ := lookupCache.LoadOrStore(ckey, toRType(&mt.Type))
+	return ti.(Type)
+}
+
+func groupAndSlotOf(ktyp, etyp Type) (Type, Type) {
+	// type group struct {
+	//     ctrl uint64
+	//     slots [abi.SwissMapGroupSlots]struct {
+	//         key  keyType
+	//         elem elemType
+	//     }
+	// }
+
+	if ktyp.Size() > abi.SwissMapMaxKeyBytes {
+		ktyp = PointerTo(ktyp)
+	}
+	if etyp.Size() > abi.SwissMapMaxElemBytes {
+		etyp = PointerTo(etyp)
+	}
+
+	fields := []StructField{
+		{
+			Name: "Key",
+			Type: ktyp,
+		},
+		{
+			Name: "Elem",
+			Type: etyp,
+		},
+	}
+	slot := StructOf(fields)
+
+	fields = []StructField{
+		{
+			Name: "Ctrl",
+			Type: TypeFor[uint64](),
+		},
+		{
+			Name: "Slots",
+			Type: ArrayOf(abi.SwissMapGroupSlots, slot),
+		},
+	}
+	group := StructOf(fields)
+	return group, slot
+}
+
+var stringType = rtypeOf("")
+
+// MapIndex returns the value associated with key in the map v.
+// It panics if v's Kind is not [Map].
+// It returns the zero Value if key is not found in the map or if v represents a nil map.
+// As in Go, the key's value must be assignable to the map's key type.
+func (v Value) MapIndex(key Value) Value {
+	v.mustBe(Map)
+	tt := (*mapType)(unsafe.Pointer(v.typ()))
+
+	// Do not require key to be exported, so that DeepEqual
+	// and other programs can use all the keys returned by
+	// MapKeys as arguments to MapIndex. If either the map
+	// or the key is unexported, though, the result will be
+	// considered unexported. This is consistent with the
+	// behavior for structs, which allow read but not write
+	// of unexported fields.
+
+	var e unsafe.Pointer
+	if (tt.Key == stringType || key.kind() == String) && tt.Key == key.typ() && tt.Elem.Size() <= abi.SwissMapMaxElemBytes {
+		k := *(*string)(key.ptr)
+		e = mapaccess_faststr(v.typ(), v.pointer(), k)
+	} else {
+		key = key.assignTo("reflect.Value.MapIndex", tt.Key, nil)
+		var k unsafe.Pointer
+		if key.flag&flagIndir != 0 {
+			k = key.ptr
+		} else {
+			k = unsafe.Pointer(&key.ptr)
+		}
+		e = mapaccess(v.typ(), v.pointer(), k)
+	}
+	if e == nil {
+		return Value{}
+	}
+	typ := tt.Elem
+	fl := (v.flag | key.flag).ro()
+	fl |= flag(typ.Kind())
+	return copyVal(typ, fl, e)
+}
+
+// Equivalent to runtime.mapIterStart.
+//
+//go:noinline
+func mapIterStart(t *abi.SwissMapType, m *maps.Map, it *maps.Iter) {
+	if race.Enabled && m != nil {
+		callerpc := sys.GetCallerPC()
+		race.ReadPC(unsafe.Pointer(m), callerpc, abi.FuncPCABIInternal(mapIterStart))
+	}
+
+	it.Init(t, m)
+	it.Next()
+}
+
+// Equivalent to runtime.mapIterNext.
+//
+//go:noinline
+func mapIterNext(it *maps.Iter) {
+	if race.Enabled {
+		callerpc := sys.GetCallerPC()
+		race.ReadPC(unsafe.Pointer(it.Map()), callerpc, abi.FuncPCABIInternal(mapIterNext))
+	}
+
+	it.Next()
+}
+
+// MapKeys returns a slice containing all the keys present in the map,
+// in unspecified order.
+// It panics if v's Kind is not [Map].
+// It returns an empty slice if v represents a nil map.
+func (v Value) MapKeys() []Value {
+	v.mustBe(Map)
+	tt := (*mapType)(unsafe.Pointer(v.typ()))
+	keyType := tt.Key
+
+	fl := v.flag.ro() | flag(keyType.Kind())
+
+	// Escape analysis can't see that the map doesn't escape. It sees an
+	// escape from maps.IterStart, via assignment into it, even though it
+	// doesn't escape this function.
+	mptr := abi.NoEscape(v.pointer())
+	m := (*maps.Map)(mptr)
+	mlen := int(0)
+	if m != nil {
+		mlen = maplen(mptr)
+	}
+	var it maps.Iter
+	mapIterStart(tt, m, &it)
+	a := make([]Value, mlen)
+	var i int
+	for i = 0; i < len(a); i++ {
+		key := it.Key()
+		if key == nil {
+			// Someone deleted an entry from the map since we
+			// called maplen above. It's a data race, but nothing
+			// we can do about it.
+			break
+		}
+		a[i] = copyVal(keyType, fl, key)
+		mapIterNext(&it)
+	}
+	return a[:i]
+}
+
+// A MapIter is an iterator for ranging over a map.
+// See [Value.MapRange].
+type MapIter struct {
+	m     Value
+	hiter maps.Iter
+}
+
+// TODO(prattmic): only for sharing the linkname declarations with old maps.
+// Remove with old maps.
+type hiter = maps.Iter
+
+// Key returns the key of iter's current map entry.
+func (iter *MapIter) Key() Value {
+	if !iter.hiter.Initialized() {
+		panic("MapIter.Key called before Next")
+	}
+	iterkey := iter.hiter.Key()
+	if iterkey == nil {
+		panic("MapIter.Key called on exhausted iterator")
+	}
+
+	t := (*mapType)(unsafe.Pointer(iter.m.typ()))
+	ktype := t.Key
+	return copyVal(ktype, iter.m.flag.ro()|flag(ktype.Kind()), iterkey)
+}
+
+// SetIterKey assigns to v the key of iter's current map entry.
+// It is equivalent to v.Set(iter.Key()), but it avoids allocating a new Value.
+// As in Go, the key must be assignable to v's type and
+// must not be derived from an unexported field.
+// It panics if [Value.CanSet] returns false.
+func (v Value) SetIterKey(iter *MapIter) {
+	if !iter.hiter.Initialized() {
+		panic("reflect: Value.SetIterKey called before Next")
+	}
+	iterkey := iter.hiter.Key()
+	if iterkey == nil {
+		panic("reflect: Value.SetIterKey called on exhausted iterator")
+	}
+
+	v.mustBeAssignable()
+	var target unsafe.Pointer
+	if v.kind() == Interface {
+		target = v.ptr
+	}
+
+	t := (*mapType)(unsafe.Pointer(iter.m.typ()))
+	ktype := t.Key
+
+	iter.m.mustBeExported() // do not let unexported m leak
+	key := Value{ktype, iterkey, iter.m.flag | flag(ktype.Kind()) | flagIndir}
+	key = key.assignTo("reflect.MapIter.SetKey", v.typ(), target)
+	typedmemmove(v.typ(), v.ptr, key.ptr)
+}
+
+// Value returns the value of iter's current map entry.
+func (iter *MapIter) Value() Value {
+	if !iter.hiter.Initialized() {
+		panic("MapIter.Value called before Next")
+	}
+	iterelem := iter.hiter.Elem()
+	if iterelem == nil {
+		panic("MapIter.Value called on exhausted iterator")
+	}
+
+	t := (*mapType)(unsafe.Pointer(iter.m.typ()))
+	vtype := t.Elem
+	return copyVal(vtype, iter.m.flag.ro()|flag(vtype.Kind()), iterelem)
+}
+
+// SetIterValue assigns to v the value of iter's current map entry.
+// It is equivalent to v.Set(iter.Value()), but it avoids allocating a new Value.
+// As in Go, the value must be assignable to v's type and
+// must not be derived from an unexported field.
+// It panics if [Value.CanSet] returns false.
+func (v Value) SetIterValue(iter *MapIter) {
+	if !iter.hiter.Initialized() {
+		panic("reflect: Value.SetIterValue called before Next")
+	}
+	iterelem := iter.hiter.Elem()
+	if iterelem == nil {
+		panic("reflect: Value.SetIterValue called on exhausted iterator")
+	}
+
+	v.mustBeAssignable()
+	var target unsafe.Pointer
+	if v.kind() == Interface {
+		target = v.ptr
+	}
+
+	t := (*mapType)(unsafe.Pointer(iter.m.typ()))
+	vtype := t.Elem
+
+	iter.m.mustBeExported() // do not let unexported m leak
+	elem := Value{vtype, iterelem, iter.m.flag | flag(vtype.Kind()) | flagIndir}
+	elem = elem.assignTo("reflect.MapIter.SetValue", v.typ(), target)
+	typedmemmove(v.typ(), v.ptr, elem.ptr)
+}
+
+// Next advances the map iterator and reports whether there is another
+// entry. It returns false when iter is exhausted; subsequent
+// calls to [MapIter.Key], [MapIter.Value], or [MapIter.Next] will panic.
+func (iter *MapIter) Next() bool {
+	if !iter.m.IsValid() {
+		panic("MapIter.Next called on an iterator that does not have an associated map Value")
+	}
+	if !iter.hiter.Initialized() {
+		t := (*mapType)(unsafe.Pointer(iter.m.typ()))
+		m := (*maps.Map)(iter.m.pointer())
+		mapIterStart(t, m, &iter.hiter)
+	} else {
+		if iter.hiter.Key() == nil {
+			panic("MapIter.Next called on exhausted iterator")
+		}
+		mapIterNext(&iter.hiter)
+	}
+	return iter.hiter.Key() != nil
+}
+
+// Reset modifies iter to iterate over v.
+// It panics if v's Kind is not [Map] and v is not the zero Value.
+// Reset(Value{}) causes iter to not to refer to any map,
+// which may allow the previously iterated-over map to be garbage collected.
+func (iter *MapIter) Reset(v Value) {
+	if v.IsValid() {
+		v.mustBe(Map)
+	}
+	iter.m = v
+	iter.hiter = maps.Iter{}
+}
+
+// MapRange returns a range iterator for a map.
+// It panics if v's Kind is not [Map].
+//
+// Call [MapIter.Next] to advance the iterator, and [MapIter.Key]/[MapIter.Value] to access each entry.
+// [MapIter.Next] returns false when the iterator is exhausted.
+// MapRange follows the same iteration semantics as a range statement.
+//
+// Example:
+//
+//	iter := reflect.ValueOf(m).MapRange()
+//	for iter.Next() {
+//		k := iter.Key()
+//		v := iter.Value()
+//		...
+//	}
+func (v Value) MapRange() *MapIter {
+	// This is inlinable to take advantage of "function outlining".
+	// The allocation of MapIter can be stack allocated if the caller
+	// does not allow it to escape.
+	// See https://blog.filippo.io/efficient-go-apis-with-the-inliner/
+	if v.kind() != Map {
+		v.panicNotMap()
+	}
+	return &MapIter{m: v}
+}
+
+// SetMapIndex sets the element associated with key in the map v to elem.
+// It panics if v's Kind is not [Map].
+// If elem is the zero Value, SetMapIndex deletes the key from the map.
+// Otherwise if v holds a nil map, SetMapIndex will panic.
+// As in Go, key's elem must be assignable to the map's key type,
+// and elem's value must be assignable to the map's elem type.
+func (v Value) SetMapIndex(key, elem Value) {
+	v.mustBe(Map)
+	v.mustBeExported()
+	key.mustBeExported()
+	tt := (*mapType)(unsafe.Pointer(v.typ()))
+
+	if (tt.Key == stringType || key.kind() == String) && tt.Key == key.typ() && tt.Elem.Size() <= abi.SwissMapMaxElemBytes {
+		k := *(*string)(key.ptr)
+		if elem.typ() == nil {
+			mapdelete_faststr(v.typ(), v.pointer(), k)
+			return
+		}
+		elem.mustBeExported()
+		elem = elem.assignTo("reflect.Value.SetMapIndex", tt.Elem, nil)
+		var e unsafe.Pointer
+		if elem.flag&flagIndir != 0 {
+			e = elem.ptr
+		} else {
+			e = unsafe.Pointer(&elem.ptr)
+		}
+		mapassign_faststr(v.typ(), v.pointer(), k, e)
+		return
+	}
+
+	key = key.assignTo("reflect.Value.SetMapIndex", tt.Key, nil)
+	var k unsafe.Pointer
+	if key.flag&flagIndir != 0 {
+		k = key.ptr
+	} else {
+		k = unsafe.Pointer(&key.ptr)
+	}
+	if elem.typ() == nil {
+		mapdelete(v.typ(), v.pointer(), k)
+		return
+	}
+	elem.mustBeExported()
+	elem = elem.assignTo("reflect.Value.SetMapIndex", tt.Elem, nil)
+	var e unsafe.Pointer
+	if elem.flag&flagIndir != 0 {
+		e = elem.ptr
+	} else {
+		e = unsafe.Pointer(&elem.ptr)
+	}
+	mapassign(v.typ(), v.pointer(), k, e)
+}
+
+// Force slow panicking path not inlined, so it won't add to the
+// inlining budget of the caller.
+// TODO: undo when the inliner is no longer bottom-up only.
+//
+//go:noinline
+func (f flag) panicNotMap() {
+	f.mustBe(Map)
+}
diff --git a/src/reflect/map_swiss_test.go b/src/reflect/map_swiss_test.go
new file mode 100644
index 00000000..621140aa
--- /dev/null
+++ b/src/reflect/map_swiss_test.go
@@ -0,0 +1,30 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build goexperiment.swissmap
+
+package reflect_test
+
+import (
+	"reflect"
+	"testing"
+)
+
+func testGCBitsMap(t *testing.T) {
+	// Unlike old maps, we don't manually construct GC data for swiss maps,
+	// instead using the public reflect API in groupAndSlotOf.
+}
+
+// See also runtime_test.TestGroupSizeZero.
+func TestGroupSizeZero(t *testing.T) {
+	st := reflect.TypeFor[struct{}]()
+	grp := reflect.MapGroupOf(st, st)
+
+	// internal/runtime/maps when create pointers to slots, even if slots
+	// are size 0. We should have reserved an extra word to ensure that
+	// pointers to the zero-size type at the end of group are valid.
+	if grp.Size() <= 8 {
+		t.Errorf("Group size got %d want >8", grp.Size())
+	}
+}
diff --git a/src/reflect/type.go b/src/reflect/type.go
index 07e2bf16..0e41a6db 100644
--- a/src/reflect/type.go
+++ b/src/reflect/type.go
@@ -18,6 +18,7 @@ package reflect
 import (
 	"internal/abi"
 	"internal/goarch"
+	"runtime"
 	"strconv"
 	"sync"
 	"unicode"
@@ -262,7 +263,7 @@ type Type interface {
 /*
  * These data structures are known to the compiler (../cmd/compile/internal/reflectdata/reflect.go).
  * A few are known to ../runtime/type.go to convey to debuggers.
- * They are also known to ../runtime/type.go.
+ * They are also known to ../internal/abi/type.go.
  */
 
 // A Kind represents the specific kind of type that a [Type] represents.
@@ -388,11 +389,6 @@ func (t *interfaceType) uncommon() *abi.UncommonType {
 	return t.Uncommon()
 }
 
-// mapType represents a map type.
-type mapType struct {
-	abi.MapType
-}
-
 // ptrType represents a pointer type.
 type ptrType struct {
 	abi.PtrType
@@ -773,14 +769,6 @@ func (t *rtype) FieldByNameFunc(match func(string) bool) (StructField, bool) {
 	return tt.FieldByNameFunc(match)
 }
 
-func (t *rtype) Key() Type {
-	if t.Kind() != Map {
-		panic("reflect: Key of non-map type " + t.String())
-	}
-	tt := (*mapType)(unsafe.Pointer(t))
-	return toType(tt.Key)
-}
-
 func (t *rtype) Len() int {
 	if t.Kind() != Array {
 		panic("reflect: Len of non-array type " + t.String())
@@ -1127,17 +1115,35 @@ func (t *structType) Field(i int) (f StructField) {
 	}
 	f.Offset = p.Offset
 
-	// NOTE(rsc): This is the only allocation in the interface
-	// presented by a reflect.Type. It would be nice to avoid,
-	// at least in the common cases, but we need to make sure
-	// that misbehaving clients of reflect cannot affect other
-	// uses of reflect. One possibility is CL 5371098, but we
-	// postponed that ugliness until there is a demonstrated
-	// need for the performance. This is issue 2320.
-	f.Index = []int{i}
+	// We can't safely use this optimization on js or wasi,
+	// which do not appear to support read-only data.
+	if i < 256 && runtime.GOOS != "js" && runtime.GOOS != "wasip1" {
+		staticuint64s := getStaticuint64s()
+		p := unsafe.Pointer(&(*staticuint64s)[i])
+		if unsafe.Sizeof(int(0)) == 4 && goarch.BigEndian {
+			p = unsafe.Add(p, 4)
+		}
+		f.Index = unsafe.Slice((*int)(p), 1)
+	} else {
+		// NOTE(rsc): This is the only allocation in the interface
+		// presented by a reflect.Type. It would be nice to avoid,
+		// but we need to make sure that misbehaving clients of
+		// reflect cannot affect other uses of reflect.
+		// One possibility is CL 5371098, but we postponed that
+		// ugliness until there is a demonstrated
+		// need for the performance. This is issue 2320.
+		f.Index = []int{i}
+	}
 	return
 }
 
+// getStaticuint64s returns a pointer to an array of 256 uint64 values,
+// defined in the runtime package in read-only memory.
+// staticuint64s[0] == 0, staticuint64s[1] == 1, and so forth.
+//
+//go:linkname getStaticuint64s runtime.getStaticuint64s
+func getStaticuint64s() *[256]uint64
+
 // TODO(gri): Should there be an error/bool indicator if the index
 // is wrong for FieldByIndex?
 
@@ -1801,79 +1807,6 @@ func ChanOf(dir ChanDir, t Type) Type {
 	return ti.(Type)
 }
 
-// MapOf returns the map type with the given key and element types.
-// For example, if k represents int and e represents string,
-// MapOf(k, e) represents map[int]string.
-//
-// If the key type is not a valid map key type (that is, if it does
-// not implement Go's == operator), MapOf panics.
-func MapOf(key, elem Type) Type {
-	ktyp := key.common()
-	etyp := elem.common()
-
-	if ktyp.Equal == nil {
-		panic("reflect.MapOf: invalid key type " + stringFor(ktyp))
-	}
-
-	// Look in cache.
-	ckey := cacheKey{Map, ktyp, etyp, 0}
-	if mt, ok := lookupCache.Load(ckey); ok {
-		return mt.(Type)
-	}
-
-	// Look in known types.
-	s := "map[" + stringFor(ktyp) + "]" + stringFor(etyp)
-	for _, tt := range typesByString(s) {
-		mt := (*mapType)(unsafe.Pointer(tt))
-		if mt.Key == ktyp && mt.Elem == etyp {
-			ti, _ := lookupCache.LoadOrStore(ckey, toRType(tt))
-			return ti.(Type)
-		}
-	}
-
-	// Make a map type.
-	// Note: flag values must match those used in the TMAP case
-	// in ../cmd/compile/internal/reflectdata/reflect.go:writeType.
-	var imap any = (map[unsafe.Pointer]unsafe.Pointer)(nil)
-	mt := **(**mapType)(unsafe.Pointer(&imap))
-	mt.Str = resolveReflectName(newName(s, "", false, false))
-	mt.TFlag = 0
-	mt.Hash = fnv1(etyp.Hash, 'm', byte(ktyp.Hash>>24), byte(ktyp.Hash>>16), byte(ktyp.Hash>>8), byte(ktyp.Hash))
-	mt.Key = ktyp
-	mt.Elem = etyp
-	mt.Bucket = bucketOf(ktyp, etyp)
-	mt.Hasher = func(p unsafe.Pointer, seed uintptr) uintptr {
-		return typehash(ktyp, p, seed)
-	}
-	mt.Flags = 0
-	if ktyp.Size_ > abi.MapMaxKeyBytes {
-		mt.KeySize = uint8(goarch.PtrSize)
-		mt.Flags |= 1 // indirect key
-	} else {
-		mt.KeySize = uint8(ktyp.Size_)
-	}
-	if etyp.Size_ > abi.MapMaxElemBytes {
-		mt.ValueSize = uint8(goarch.PtrSize)
-		mt.Flags |= 2 // indirect value
-	} else {
-		mt.MapType.ValueSize = uint8(etyp.Size_)
-	}
-	mt.MapType.BucketSize = uint16(mt.Bucket.Size_)
-	if isReflexive(ktyp) {
-		mt.Flags |= 4
-	}
-	if needKeyUpdate(ktyp) {
-		mt.Flags |= 8
-	}
-	if hashMightPanic(ktyp) {
-		mt.Flags |= 16
-	}
-	mt.PtrToThis = 0
-
-	ti, _ := lookupCache.LoadOrStore(ckey, toRType(&mt.Type))
-	return ti.(Type)
-}
-
 var funcTypes []Type
 var funcTypesMutex sync.Mutex
 
@@ -2106,79 +2039,9 @@ func hashMightPanic(t *abi.Type) bool {
 	}
 }
 
-func bucketOf(ktyp, etyp *abi.Type) *abi.Type {
-	if ktyp.Size_ > abi.MapMaxKeyBytes {
-		ktyp = ptrTo(ktyp)
-	}
-	if etyp.Size_ > abi.MapMaxElemBytes {
-		etyp = ptrTo(etyp)
-	}
-
-	// Prepare GC data if any.
-	// A bucket is at most bucketSize*(1+maxKeySize+maxValSize)+ptrSize bytes,
-	// or 2064 bytes, or 258 pointer-size words, or 33 bytes of pointer bitmap.
-	// Note that since the key and value are known to be <= 128 bytes,
-	// they're guaranteed to have bitmaps instead of GC programs.
-	var gcdata *byte
-	var ptrdata uintptr
-
-	size := abi.MapBucketCount*(1+ktyp.Size_+etyp.Size_) + goarch.PtrSize
-	if size&uintptr(ktyp.Align_-1) != 0 || size&uintptr(etyp.Align_-1) != 0 {
-		panic("reflect: bad size computation in MapOf")
-	}
-
-	if ktyp.Pointers() || etyp.Pointers() {
-		nptr := (abi.MapBucketCount*(1+ktyp.Size_+etyp.Size_) + goarch.PtrSize) / goarch.PtrSize
-		n := (nptr + 7) / 8
-
-		// Runtime needs pointer masks to be a multiple of uintptr in size.
-		n = (n + goarch.PtrSize - 1) &^ (goarch.PtrSize - 1)
-		mask := make([]byte, n)
-		base := uintptr(abi.MapBucketCount / goarch.PtrSize)
-
-		if ktyp.Pointers() {
-			emitGCMask(mask, base, ktyp, abi.MapBucketCount)
-		}
-		base += abi.MapBucketCount * ktyp.Size_ / goarch.PtrSize
-
-		if etyp.Pointers() {
-			emitGCMask(mask, base, etyp, abi.MapBucketCount)
-		}
-		base += abi.MapBucketCount * etyp.Size_ / goarch.PtrSize
-
-		word := base
-		mask[word/8] |= 1 << (word % 8)
-		gcdata = &mask[0]
-		ptrdata = (word + 1) * goarch.PtrSize
-
-		// overflow word must be last
-		if ptrdata != size {
-			panic("reflect: bad layout computation in MapOf")
-		}
-	}
-
-	b := &abi.Type{
-		Align_:   goarch.PtrSize,
-		Size_:    size,
-		Kind_:    abi.Struct,
-		PtrBytes: ptrdata,
-		GCData:   gcdata,
-	}
-	s := "bucket(" + stringFor(ktyp) + "," + stringFor(etyp) + ")"
-	b.Str = resolveReflectName(newName(s, "", false, false))
-	return b
-}
-
-func (t *rtype) gcSlice(begin, end uintptr) []byte {
-	return (*[1 << 30]byte)(unsafe.Pointer(t.t.GCData))[begin:end:end]
-}
-
 // emitGCMask writes the GC mask for [n]typ into out, starting at bit
 // offset base.
 func emitGCMask(out []byte, base uintptr, typ *abi.Type, n uintptr) {
-	if typ.Kind_&abi.KindGCProg != 0 {
-		panic("reflect: unexpected GC program")
-	}
 	ptrs := typ.PtrBytes / goarch.PtrSize
 	words := typ.Size_ / goarch.PtrSize
 	mask := typ.GcSlice(0, (ptrs+7)/8)
@@ -2192,32 +2055,6 @@ func emitGCMask(out []byte, base uintptr, typ *abi.Type, n uintptr) {
 	}
 }
 
-// appendGCProg appends the GC program for the first ptrdata bytes of
-// typ to dst and returns the extended slice.
-func appendGCProg(dst []byte, typ *abi.Type) []byte {
-	if typ.Kind_&abi.KindGCProg != 0 {
-		// Element has GC program; emit one element.
-		n := uintptr(*(*uint32)(unsafe.Pointer(typ.GCData)))
-		prog := typ.GcSlice(4, 4+n-1)
-		return append(dst, prog...)
-	}
-
-	// Element is small with pointer mask; use as literal bits.
-	ptrs := typ.PtrBytes / goarch.PtrSize
-	mask := typ.GcSlice(0, (ptrs+7)/8)
-
-	// Emit 120-bit chunks of full bytes (max is 127 but we avoid using partial bytes).
-	for ; ptrs > 120; ptrs -= 120 {
-		dst = append(dst, 120)
-		dst = append(dst, mask[:15]...)
-		mask = mask[15:]
-	}
-
-	dst = append(dst, byte(ptrs))
-	dst = append(dst, mask...)
-	return dst
-}
-
 // SliceOf returns the slice type with element type t.
 // For example, if t represents int, SliceOf(t) represents []int.
 func SliceOf(t Type) Type {
@@ -2356,8 +2193,6 @@ func StructOf(fields []StructField) Type {
 		fs   = make([]structField, len(fields))
 		repr = make([]byte, 0, 64)
 		fset = map[string]struct{}{} // fields' names
-
-		hasGCProg = false // records whether a struct-field type has a GCProg
 	)
 
 	lastzero := uintptr(0)
@@ -2375,9 +2210,6 @@ func StructOf(fields []StructField) Type {
 		}
 		f, fpkgpath := runtimeStructField(field)
 		ft := f.Typ
-		if ft.Kind_&abi.KindGCProg != 0 {
-			hasGCProg = true
-		}
 		if fpkgpath != "" {
 			if pkgpath == "" {
 				pkgpath = fpkgpath
@@ -2648,51 +2480,19 @@ func StructOf(fields []StructField) Type {
 		typ.TFlag |= abi.TFlagUncommon
 	}
 
-	if hasGCProg {
-		lastPtrField := 0
-		for i, ft := range fs {
-			if ft.Typ.Pointers() {
-				lastPtrField = i
-			}
-		}
-		prog := []byte{0, 0, 0, 0} // will be length of prog
-		var off uintptr
-		for i, ft := range fs {
-			if i > lastPtrField {
-				// gcprog should not include anything for any field after
-				// the last field that contains pointer data
-				break
-			}
-			if !ft.Typ.Pointers() {
-				// Ignore pointerless fields.
-				continue
-			}
-			// Pad to start of this field with zeros.
-			if ft.Offset > off {
-				n := (ft.Offset - off) / goarch.PtrSize
-				prog = append(prog, 0x01, 0x00) // emit a 0 bit
-				if n > 1 {
-					prog = append(prog, 0x81)      // repeat previous bit
-					prog = appendVarint(prog, n-1) // n-1 times
-				}
-				off = ft.Offset
-			}
-
-			prog = appendGCProg(prog, ft.Typ)
-			off += ft.Typ.PtrBytes
-		}
-		prog = append(prog, 0)
-		*(*uint32)(unsafe.Pointer(&prog[0])) = uint32(len(prog) - 4)
-		typ.Kind_ |= abi.KindGCProg
-		typ.GCData = &prog[0]
-	} else {
-		typ.Kind_ &^= abi.KindGCProg
+	if typ.PtrBytes == 0 {
+		typ.GCData = nil
+	} else if typ.PtrBytes <= abi.MaxPtrmaskBytes*8*goarch.PtrSize {
 		bv := new(bitVector)
 		addTypeBits(bv, 0, &typ.Type)
-		if len(bv.data) > 0 {
-			typ.GCData = &bv.data[0]
-		}
+		typ.GCData = &bv.data[0]
+	} else {
+		// Runtime will build the mask if needed. We just need to allocate
+		// space to store it.
+		typ.TFlag |= abi.TFlagGCMaskOnDemand
+		typ.GCData = (*byte)(unsafe.Pointer(new(uintptr)))
 	}
+
 	typ.Equal = nil
 	if comparable {
 		typ.Equal = func(p, q unsafe.Pointer) bool {
@@ -2824,6 +2624,8 @@ func ArrayOf(length int, elem Type) Type {
 	array.Size_ = typ.Size_ * uintptr(length)
 	if length > 0 && typ.Pointers() {
 		array.PtrBytes = typ.Size_*uintptr(length-1) + typ.PtrBytes
+	} else {
+		array.PtrBytes = 0
 	}
 	array.Align_ = typ.Align_
 	array.FieldAlign_ = typ.FieldAlign_
@@ -2831,21 +2633,18 @@ func ArrayOf(length int, elem Type) Type {
 	array.Slice = &(SliceOf(elem).(*rtype).t)
 
 	switch {
-	case !typ.Pointers() || array.Size_ == 0:
+	case array.PtrBytes == 0:
 		// No pointers.
 		array.GCData = nil
-		array.PtrBytes = 0
 
 	case length == 1:
 		// In memory, 1-element array looks just like the element.
-		array.Kind_ |= typ.Kind_ & abi.KindGCProg
+		// We share the bitmask with the element type.
+		array.TFlag |= typ.TFlag & abi.TFlagGCMaskOnDemand
 		array.GCData = typ.GCData
-		array.PtrBytes = typ.PtrBytes
 
-	case typ.Kind_&abi.KindGCProg == 0 && array.Size_ <= abi.MaxPtrmaskBytes*8*goarch.PtrSize:
-		// Element is small with pointer mask; array is still small.
-		// Create direct pointer mask by turning each 1 bit in elem
-		// into length 1 bits in larger mask.
+	case array.PtrBytes <= abi.MaxPtrmaskBytes*8*goarch.PtrSize:
+		// Create pointer mask by repeating the element bitmask Len times.
 		n := (array.PtrBytes/goarch.PtrSize + 7) / 8
 		// Runtime needs pointer masks to be a multiple of uintptr in size.
 		n = (n + goarch.PtrSize - 1) &^ (goarch.PtrSize - 1)
@@ -2854,34 +2653,10 @@ func ArrayOf(length int, elem Type) Type {
 		array.GCData = &mask[0]
 
 	default:
-		// Create program that emits one element
-		// and then repeats to make the array.
-		prog := []byte{0, 0, 0, 0} // will be length of prog
-		prog = appendGCProg(prog, typ)
-		// Pad from ptrdata to size.
-		elemPtrs := typ.PtrBytes / goarch.PtrSize
-		elemWords := typ.Size_ / goarch.PtrSize
-		if elemPtrs < elemWords {
-			// Emit literal 0 bit, then repeat as needed.
-			prog = append(prog, 0x01, 0x00)
-			if elemPtrs+1 < elemWords {
-				prog = append(prog, 0x81)
-				prog = appendVarint(prog, elemWords-elemPtrs-1)
-			}
-		}
-		// Repeat length-1 times.
-		if elemWords < 0x80 {
-			prog = append(prog, byte(elemWords|0x80))
-		} else {
-			prog = append(prog, 0x80)
-			prog = appendVarint(prog, elemWords)
-		}
-		prog = appendVarint(prog, uintptr(length)-1)
-		prog = append(prog, 0)
-		*(*uint32)(unsafe.Pointer(&prog[0])) = uint32(len(prog) - 4)
-		array.Kind_ |= abi.KindGCProg
-		array.GCData = &prog[0]
-		array.PtrBytes = array.Size_ // overestimate but ok; must match program
+		// Runtime will build the mask if needed. We just need to allocate
+		// space to store it.
+		array.TFlag |= abi.TFlagGCMaskOnDemand
+		array.GCData = (*byte)(unsafe.Pointer(new(uintptr)))
 	}
 
 	etyp := typ
diff --git a/src/reflect/value.go b/src/reflect/value.go
index 0854371e..ba5b106c 100644
--- a/src/reflect/value.go
+++ b/src/reflect/value.go
@@ -1779,265 +1779,6 @@ func (v Value) lenNonSlice() int {
 	panic(&ValueError{"reflect.Value.Len", v.kind()})
 }
 
-var stringType = rtypeOf("")
-
-// MapIndex returns the value associated with key in the map v.
-// It panics if v's Kind is not [Map].
-// It returns the zero Value if key is not found in the map or if v represents a nil map.
-// As in Go, the key's value must be assignable to the map's key type.
-func (v Value) MapIndex(key Value) Value {
-	v.mustBe(Map)
-	tt := (*mapType)(unsafe.Pointer(v.typ()))
-
-	// Do not require key to be exported, so that DeepEqual
-	// and other programs can use all the keys returned by
-	// MapKeys as arguments to MapIndex. If either the map
-	// or the key is unexported, though, the result will be
-	// considered unexported. This is consistent with the
-	// behavior for structs, which allow read but not write
-	// of unexported fields.
-
-	var e unsafe.Pointer
-	if (tt.Key == stringType || key.kind() == String) && tt.Key == key.typ() && tt.Elem.Size() <= abi.MapMaxElemBytes {
-		k := *(*string)(key.ptr)
-		e = mapaccess_faststr(v.typ(), v.pointer(), k)
-	} else {
-		key = key.assignTo("reflect.Value.MapIndex", tt.Key, nil)
-		var k unsafe.Pointer
-		if key.flag&flagIndir != 0 {
-			k = key.ptr
-		} else {
-			k = unsafe.Pointer(&key.ptr)
-		}
-		e = mapaccess(v.typ(), v.pointer(), k)
-	}
-	if e == nil {
-		return Value{}
-	}
-	typ := tt.Elem
-	fl := (v.flag | key.flag).ro()
-	fl |= flag(typ.Kind())
-	return copyVal(typ, fl, e)
-}
-
-// MapKeys returns a slice containing all the keys present in the map,
-// in unspecified order.
-// It panics if v's Kind is not [Map].
-// It returns an empty slice if v represents a nil map.
-func (v Value) MapKeys() []Value {
-	v.mustBe(Map)
-	tt := (*mapType)(unsafe.Pointer(v.typ()))
-	keyType := tt.Key
-
-	fl := v.flag.ro() | flag(keyType.Kind())
-
-	m := v.pointer()
-	mlen := int(0)
-	if m != nil {
-		mlen = maplen(m)
-	}
-	var it hiter
-	mapiterinit(v.typ(), m, &it)
-	a := make([]Value, mlen)
-	var i int
-	for i = 0; i < len(a); i++ {
-		key := mapiterkey(&it)
-		if key == nil {
-			// Someone deleted an entry from the map since we
-			// called maplen above. It's a data race, but nothing
-			// we can do about it.
-			break
-		}
-		a[i] = copyVal(keyType, fl, key)
-		mapiternext(&it)
-	}
-	return a[:i]
-}
-
-// hiter's structure matches runtime.hiter's structure.
-// Having a clone here allows us to embed a map iterator
-// inside type MapIter so that MapIters can be re-used
-// without doing any allocations.
-type hiter struct {
-	key         unsafe.Pointer
-	elem        unsafe.Pointer
-	t           unsafe.Pointer
-	h           unsafe.Pointer
-	buckets     unsafe.Pointer
-	bptr        unsafe.Pointer
-	overflow    *[]unsafe.Pointer
-	oldoverflow *[]unsafe.Pointer
-	startBucket uintptr
-	offset      uint8
-	wrapped     bool
-	B           uint8
-	i           uint8
-	bucket      uintptr
-	checkBucket uintptr
-}
-
-func (h *hiter) initialized() bool {
-	return h.t != nil
-}
-
-// A MapIter is an iterator for ranging over a map.
-// See [Value.MapRange].
-type MapIter struct {
-	m     Value
-	hiter hiter
-}
-
-// Key returns the key of iter's current map entry.
-func (iter *MapIter) Key() Value {
-	if !iter.hiter.initialized() {
-		panic("MapIter.Key called before Next")
-	}
-	iterkey := mapiterkey(&iter.hiter)
-	if iterkey == nil {
-		panic("MapIter.Key called on exhausted iterator")
-	}
-
-	t := (*mapType)(unsafe.Pointer(iter.m.typ()))
-	ktype := t.Key
-	return copyVal(ktype, iter.m.flag.ro()|flag(ktype.Kind()), iterkey)
-}
-
-// SetIterKey assigns to v the key of iter's current map entry.
-// It is equivalent to v.Set(iter.Key()), but it avoids allocating a new Value.
-// As in Go, the key must be assignable to v's type and
-// must not be derived from an unexported field.
-func (v Value) SetIterKey(iter *MapIter) {
-	if !iter.hiter.initialized() {
-		panic("reflect: Value.SetIterKey called before Next")
-	}
-	iterkey := mapiterkey(&iter.hiter)
-	if iterkey == nil {
-		panic("reflect: Value.SetIterKey called on exhausted iterator")
-	}
-
-	v.mustBeAssignable()
-	var target unsafe.Pointer
-	if v.kind() == Interface {
-		target = v.ptr
-	}
-
-	t := (*mapType)(unsafe.Pointer(iter.m.typ()))
-	ktype := t.Key
-
-	iter.m.mustBeExported() // do not let unexported m leak
-	key := Value{ktype, iterkey, iter.m.flag | flag(ktype.Kind()) | flagIndir}
-	key = key.assignTo("reflect.MapIter.SetKey", v.typ(), target)
-	typedmemmove(v.typ(), v.ptr, key.ptr)
-}
-
-// Value returns the value of iter's current map entry.
-func (iter *MapIter) Value() Value {
-	if !iter.hiter.initialized() {
-		panic("MapIter.Value called before Next")
-	}
-	iterelem := mapiterelem(&iter.hiter)
-	if iterelem == nil {
-		panic("MapIter.Value called on exhausted iterator")
-	}
-
-	t := (*mapType)(unsafe.Pointer(iter.m.typ()))
-	vtype := t.Elem
-	return copyVal(vtype, iter.m.flag.ro()|flag(vtype.Kind()), iterelem)
-}
-
-// SetIterValue assigns to v the value of iter's current map entry.
-// It is equivalent to v.Set(iter.Value()), but it avoids allocating a new Value.
-// As in Go, the value must be assignable to v's type and
-// must not be derived from an unexported field.
-func (v Value) SetIterValue(iter *MapIter) {
-	if !iter.hiter.initialized() {
-		panic("reflect: Value.SetIterValue called before Next")
-	}
-	iterelem := mapiterelem(&iter.hiter)
-	if iterelem == nil {
-		panic("reflect: Value.SetIterValue called on exhausted iterator")
-	}
-
-	v.mustBeAssignable()
-	var target unsafe.Pointer
-	if v.kind() == Interface {
-		target = v.ptr
-	}
-
-	t := (*mapType)(unsafe.Pointer(iter.m.typ()))
-	vtype := t.Elem
-
-	iter.m.mustBeExported() // do not let unexported m leak
-	elem := Value{vtype, iterelem, iter.m.flag | flag(vtype.Kind()) | flagIndir}
-	elem = elem.assignTo("reflect.MapIter.SetValue", v.typ(), target)
-	typedmemmove(v.typ(), v.ptr, elem.ptr)
-}
-
-// Next advances the map iterator and reports whether there is another
-// entry. It returns false when iter is exhausted; subsequent
-// calls to [MapIter.Key], [MapIter.Value], or [MapIter.Next] will panic.
-func (iter *MapIter) Next() bool {
-	if !iter.m.IsValid() {
-		panic("MapIter.Next called on an iterator that does not have an associated map Value")
-	}
-	if !iter.hiter.initialized() {
-		mapiterinit(iter.m.typ(), iter.m.pointer(), &iter.hiter)
-	} else {
-		if mapiterkey(&iter.hiter) == nil {
-			panic("MapIter.Next called on exhausted iterator")
-		}
-		mapiternext(&iter.hiter)
-	}
-	return mapiterkey(&iter.hiter) != nil
-}
-
-// Reset modifies iter to iterate over v.
-// It panics if v's Kind is not [Map] and v is not the zero Value.
-// Reset(Value{}) causes iter to not to refer to any map,
-// which may allow the previously iterated-over map to be garbage collected.
-func (iter *MapIter) Reset(v Value) {
-	if v.IsValid() {
-		v.mustBe(Map)
-	}
-	iter.m = v
-	iter.hiter = hiter{}
-}
-
-// MapRange returns a range iterator for a map.
-// It panics if v's Kind is not [Map].
-//
-// Call [MapIter.Next] to advance the iterator, and [MapIter.Key]/[MapIter.Value] to access each entry.
-// [MapIter.Next] returns false when the iterator is exhausted.
-// MapRange follows the same iteration semantics as a range statement.
-//
-// Example:
-//
-//	iter := reflect.ValueOf(m).MapRange()
-//	for iter.Next() {
-//		k := iter.Key()
-//		v := iter.Value()
-//		...
-//	}
-func (v Value) MapRange() *MapIter {
-	// This is inlinable to take advantage of "function outlining".
-	// The allocation of MapIter can be stack allocated if the caller
-	// does not allow it to escape.
-	// See https://blog.filippo.io/efficient-go-apis-with-the-inliner/
-	if v.kind() != Map {
-		v.panicNotMap()
-	}
-	return &MapIter{m: v}
-}
-
-// Force slow panicking path not inlined, so it won't add to the
-// inlining budget of the caller.
-// TODO: undo when the inliner is no longer bottom-up only.
-//
-//go:noinline
-func (f flag) panicNotMap() {
-	f.mustBe(Map)
-}
-
 // copyVal returns a Value containing the map key or value at ptr,
 // allocating a new variable as needed.
 func copyVal(typ *abi.Type, fl flag, ptr unsafe.Pointer) Value {
@@ -2331,7 +2072,8 @@ func (v Value) SetBool(x bool) {
 }
 
 // SetBytes sets v's underlying value.
-// It panics if v's underlying value is not a slice of bytes.
+// It panics if v's underlying value is not a slice of bytes
+// or if [Value.CanSet] returns false.
 func (v Value) SetBytes(x []byte) {
 	v.mustBeAssignable()
 	v.mustBe(Slice)
@@ -2342,7 +2084,8 @@ func (v Value) SetBytes(x []byte) {
 }
 
 // setRunes sets v's underlying value.
-// It panics if v's underlying value is not a slice of runes (int32s).
+// It panics if v's underlying value is not a slice of runes (int32s)
+// or if [Value.CanSet] returns false.
 func (v Value) setRunes(x []rune) {
 	v.mustBeAssignable()
 	v.mustBe(Slice)
@@ -2353,7 +2096,8 @@ func (v Value) setRunes(x []rune) {
 }
 
 // SetComplex sets v's underlying value to x.
-// It panics if v's Kind is not [Complex64] or [Complex128], or if [Value.CanSet] returns false.
+// It panics if v's Kind is not [Complex64] or [Complex128],
+// or if [Value.CanSet] returns false.
 func (v Value) SetComplex(x complex128) {
 	v.mustBeAssignable()
 	switch k := v.kind(); k {
@@ -2367,7 +2111,8 @@ func (v Value) SetComplex(x complex128) {
 }
 
 // SetFloat sets v's underlying value to x.
-// It panics if v's Kind is not [Float32] or [Float64], or if [Value.CanSet] returns false.
+// It panics if v's Kind is not [Float32] or [Float64],
+// or if [Value.CanSet] returns false.
 func (v Value) SetFloat(x float64) {
 	v.mustBeAssignable()
 	switch k := v.kind(); k {
@@ -2381,7 +2126,8 @@ func (v Value) SetFloat(x float64) {
 }
 
 // SetInt sets v's underlying value to x.
-// It panics if v's Kind is not [Int], [Int8], [Int16], [Int32], or [Int64], or if [Value.CanSet] returns false.
+// It panics if v's Kind is not [Int], [Int8], [Int16], [Int32], or [Int64],
+// or if [Value.CanSet] returns false.
 func (v Value) SetInt(x int64) {
 	v.mustBeAssignable()
 	switch k := v.kind(); k {
@@ -2401,8 +2147,9 @@ func (v Value) SetInt(x int64) {
 }
 
 // SetLen sets v's length to n.
-// It panics if v's Kind is not [Slice] or if n is negative or
-// greater than the capacity of the slice.
+// It panics if v's Kind is not [Slice], or if n is negative or
+// greater than the capacity of the slice,
+// or if [Value.CanSet] returns false.
 func (v Value) SetLen(n int) {
 	v.mustBeAssignable()
 	v.mustBe(Slice)
@@ -2414,8 +2161,9 @@ func (v Value) SetLen(n int) {
 }
 
 // SetCap sets v's capacity to n.
-// It panics if v's Kind is not [Slice] or if n is smaller than the length or
-// greater than the capacity of the slice.
+// It panics if v's Kind is not [Slice], or if n is smaller than the length or
+// greater than the capacity of the slice,
+// or if [Value.CanSet] returns false.
 func (v Value) SetCap(n int) {
 	v.mustBeAssignable()
 	v.mustBe(Slice)
@@ -2426,60 +2174,9 @@ func (v Value) SetCap(n int) {
 	s.Cap = n
 }
 
-// SetMapIndex sets the element associated with key in the map v to elem.
-// It panics if v's Kind is not [Map].
-// If elem is the zero Value, SetMapIndex deletes the key from the map.
-// Otherwise if v holds a nil map, SetMapIndex will panic.
-// As in Go, key's elem must be assignable to the map's key type,
-// and elem's value must be assignable to the map's elem type.
-func (v Value) SetMapIndex(key, elem Value) {
-	v.mustBe(Map)
-	v.mustBeExported()
-	key.mustBeExported()
-	tt := (*mapType)(unsafe.Pointer(v.typ()))
-
-	if (tt.Key == stringType || key.kind() == String) && tt.Key == key.typ() && tt.Elem.Size() <= abi.MapMaxElemBytes {
-		k := *(*string)(key.ptr)
-		if elem.typ() == nil {
-			mapdelete_faststr(v.typ(), v.pointer(), k)
-			return
-		}
-		elem.mustBeExported()
-		elem = elem.assignTo("reflect.Value.SetMapIndex", tt.Elem, nil)
-		var e unsafe.Pointer
-		if elem.flag&flagIndir != 0 {
-			e = elem.ptr
-		} else {
-			e = unsafe.Pointer(&elem.ptr)
-		}
-		mapassign_faststr(v.typ(), v.pointer(), k, e)
-		return
-	}
-
-	key = key.assignTo("reflect.Value.SetMapIndex", tt.Key, nil)
-	var k unsafe.Pointer
-	if key.flag&flagIndir != 0 {
-		k = key.ptr
-	} else {
-		k = unsafe.Pointer(&key.ptr)
-	}
-	if elem.typ() == nil {
-		mapdelete(v.typ(), v.pointer(), k)
-		return
-	}
-	elem.mustBeExported()
-	elem = elem.assignTo("reflect.Value.SetMapIndex", tt.Elem, nil)
-	var e unsafe.Pointer
-	if elem.flag&flagIndir != 0 {
-		e = elem.ptr
-	} else {
-		e = unsafe.Pointer(&elem.ptr)
-	}
-	mapassign(v.typ(), v.pointer(), k, e)
-}
-
 // SetUint sets v's underlying value to x.
-// It panics if v's Kind is not [Uint], [Uintptr], [Uint8], [Uint16], [Uint32], or [Uint64], or if [Value.CanSet] returns false.
+// It panics if v's Kind is not [Uint], [Uintptr], [Uint8], [Uint16], [Uint32], or [Uint64],
+// or if [Value.CanSet] returns false.
 func (v Value) SetUint(x uint64) {
 	v.mustBeAssignable()
 	switch k := v.kind(); k {
@@ -2501,7 +2198,8 @@ func (v Value) SetUint(x uint64) {
 }
 
 // SetPointer sets the [unsafe.Pointer] value v to x.
-// It panics if v's Kind is not [UnsafePointer].
+// It panics if v's Kind is not [UnsafePointer]
+// or if [Value.CanSet] returns false.
 func (v Value) SetPointer(x unsafe.Pointer) {
 	v.mustBeAssignable()
 	v.mustBe(UnsafePointer)
@@ -2677,7 +2375,7 @@ func (v Value) TrySend(x Value) bool {
 // Type returns v's type.
 func (v Value) Type() Type {
 	if v.flag != 0 && v.flag&flagMethod == 0 {
-		return (*rtype)(noescape(unsafe.Pointer(v.typ_))) // inline of toRType(v.typ()), for own inlining in inline test
+		return (*rtype)(abi.NoEscape(unsafe.Pointer(v.typ_))) // inline of toRType(v.typ()), for own inlining in inline test
 	}
 	return v.typeSlow()
 }
@@ -2869,8 +2567,8 @@ func arrayAt(p unsafe.Pointer, i int, eltSize uintptr, whySafe string) unsafe.Po
 // another n elements. After Grow(n), at least n elements can be appended
 // to the slice without another allocation.
 //
-// It panics if v's Kind is not a [Slice] or if n is negative or too large to
-// allocate the memory.
+// It panics if v's Kind is not a [Slice], or if n is negative or too large to
+// allocate the memory, or if [Value.CanSet] returns false.
 func (v Value) Grow(n int) {
 	v.mustBeAssignable()
 	v.mustBe(Slice)
@@ -2958,6 +2656,7 @@ func AppendSlice(s, t Value) Value {
 // It returns the number of elements copied.
 // Dst and src each must have kind [Slice] or [Array], and
 // dst and src must have the same element type.
+// It dst is an [Array], it panics if [Value.CanSet] returns false.
 //
 // As a special case, src can have kind [String] if the element type of dst is kind [Uint8].
 func Copy(dst, src Value) int {
@@ -3904,18 +3603,6 @@ func mapdelete(t *abi.Type, m unsafe.Pointer, key unsafe.Pointer)
 //go:noescape
 func mapdelete_faststr(t *abi.Type, m unsafe.Pointer, key string)
 
-//go:noescape
-func mapiterinit(t *abi.Type, m unsafe.Pointer, it *hiter)
-
-//go:noescape
-func mapiterkey(it *hiter) (key unsafe.Pointer)
-
-//go:noescape
-func mapiterelem(it *hiter) (elem unsafe.Pointer)
-
-//go:noescape
-func mapiternext(it *hiter)
-
 //go:noescape
 func maplen(m unsafe.Pointer) int
 
@@ -4018,13 +3705,3 @@ func contentEscapes(x unsafe.Pointer) {
 		escapes(*(*any)(x)) // the dereference may not always be safe, but never executed
 	}
 }
-
-// This is just a wrapper around abi.NoEscape. The inlining heuristics are
-// finnicky and for whatever reason treat the local call to noescape as much
-// lower cost with respect to the inliner budget. (That is, replacing calls to
-// noescape with abi.NoEscape will cause inlining tests to fail.)
-//
-//go:nosplit
-func noescape(p unsafe.Pointer) unsafe.Pointer {
-	return abi.NoEscape(p)
-}
diff --git a/src/regexp/all_test.go b/src/regexp/all_test.go
index c9c046b6..ead184d2 100644
--- a/src/regexp/all_test.go
+++ b/src/regexp/all_test.go
@@ -965,6 +965,21 @@ func TestUnmarshalText(t *testing.T) {
 		if unmarshaled.String() != goodRe[i] {
 			t.Errorf("UnmarshalText returned unexpected value: %s", unmarshaled.String())
 		}
+
+		buf := make([]byte, 4, 32)
+		marshalAppend, err := re.AppendText(buf)
+		if err != nil {
+			t.Errorf("regexp %#q failed to marshal: %s", re, err)
+			continue
+		}
+		marshalAppend = marshalAppend[4:]
+		if err := unmarshaled.UnmarshalText(marshalAppend); err != nil {
+			t.Errorf("regexp %#q failed to unmarshal: %s", re, err)
+			continue
+		}
+		if unmarshaled.String() != goodRe[i] {
+			t.Errorf("UnmarshalText returned unexpected value: %s", unmarshaled.String())
+		}
 	}
 	t.Run("invalid pattern", func(t *testing.T) {
 		re := new(Regexp)
diff --git a/src/regexp/onepass.go b/src/regexp/onepass.go
index 53cbd958..96e36066 100644
--- a/src/regexp/onepass.go
+++ b/src/regexp/onepass.go
@@ -465,12 +465,20 @@ func compileOnePass(prog *syntax.Prog) (p *onePassProg) {
 		syntax.EmptyOp(prog.Inst[prog.Start].Arg)&syntax.EmptyBeginText != syntax.EmptyBeginText {
 		return nil
 	}
-	// every instruction leading to InstMatch must be EmptyEndText
+	hasAlt := false
+	for _, inst := range prog.Inst {
+		if inst.Op == syntax.InstAlt || inst.Op == syntax.InstAltMatch {
+			hasAlt = true
+			break
+		}
+	}
+	// If we have alternates, every instruction leading to InstMatch must be EmptyEndText.
+	// Also, any match on empty text must be $.
 	for _, inst := range prog.Inst {
 		opOut := prog.Inst[inst.Out].Op
 		switch inst.Op {
 		default:
-			if opOut == syntax.InstMatch {
+			if opOut == syntax.InstMatch && hasAlt {
 				return nil
 			}
 		case syntax.InstAlt, syntax.InstAltMatch:
diff --git a/src/regexp/onepass_test.go b/src/regexp/onepass_test.go
index 3f44dc7b..70eba1f5 100644
--- a/src/regexp/onepass_test.go
+++ b/src/regexp/onepass_test.go
@@ -142,6 +142,7 @@ var onePassTests = []struct {
 	{`^(?:(a)|(?:a*))$`, false},
 	{`^(?:(?:(?:.(?:$))?))$`, true},
 	{`^abcd$`, true},
+	{`^abcd`, true},
 	{`^(?:(?:a{0,})*?)$`, false},
 	{`^(?:(?:a+)*)$`, true},
 	{`^(?:(?:a|(?:aa)))$`, true},
@@ -154,6 +155,7 @@ var onePassTests = []struct {
 	{`^(?:(?:aa)|a)$`, true},
 	{`^[a-c]*`, false},
 	{`^...$`, true},
+	{`^...`, true},
 	{`^(?:a|(?:aa))$`, true},
 	{`^a((b))c$`, true},
 	{`^a.[l-nA-Cg-j]?e$`, true},
diff --git a/src/regexp/regexp.go b/src/regexp/regexp.go
index e0609942..253415fb 100644
--- a/src/regexp/regexp.go
+++ b/src/regexp/regexp.go
@@ -1277,14 +1277,22 @@ func (re *Regexp) Split(s string, n int) []string {
 	return strings
 }
 
-// MarshalText implements [encoding.TextMarshaler]. The output
+// AppendText implements [encoding.TextAppender]. The output
 // matches that of calling the [Regexp.String] method.
 //
 // Note that the output is lossy in some cases: This method does not indicate
 // POSIX regular expressions (i.e. those compiled by calling [CompilePOSIX]), or
 // those for which the [Regexp.Longest] method has been called.
+func (re *Regexp) AppendText(b []byte) ([]byte, error) {
+	return append(b, re.String()...), nil
+}
+
+// MarshalText implements [encoding.TextMarshaler]. The output
+// matches that of calling the [Regexp.AppendText] method.
+//
+// See [Regexp.AppendText] for more information.
 func (re *Regexp) MarshalText() ([]byte, error) {
-	return []byte(re.String()), nil
+	return re.AppendText(nil)
 }
 
 // UnmarshalText implements [encoding.TextUnmarshaler] by calling
diff --git a/src/regexp/syntax/parse.go b/src/regexp/syntax/parse.go
index 26242902..ed239daf 100644
--- a/src/regexp/syntax/parse.go
+++ b/src/regexp/syntax/parse.go
@@ -621,7 +621,7 @@ func (p *parser) factor(sub []*Regexp) []*Regexp {
 		}
 
 		// Found end of a run with common leading literal string:
-		// sub[start:i] all begin with str[0:len(str)], but sub[i]
+		// sub[start:i] all begin with str[:len(str)], but sub[i]
 		// does not even begin with str[0].
 		//
 		// Factor out common string and append factored expression to out.
diff --git a/src/runtime/HACKING.md b/src/runtime/HACKING.md
index e1a43ba8..f0c60f3a 100644
--- a/src/runtime/HACKING.md
+++ b/src/runtime/HACKING.md
@@ -235,7 +235,7 @@ There are three mechanisms for allocating unmanaged memory:
   objects of the same type.
 
 In general, types that are allocated using any of these should be
-marked as not in heap by embedding `runtime/internal/sys.NotInHeap`.
+marked as not in heap by embedding `internal/runtime/sys.NotInHeap`.
 
 Objects that are allocated in unmanaged memory **must not** contain
 heap pointers unless the following rules are also obeyed:
diff --git a/src/runtime/alg.go b/src/runtime/alg.go
index bfb9fa1d..07c115f7 100644
--- a/src/runtime/alg.go
+++ b/src/runtime/alg.go
@@ -8,6 +8,7 @@ import (
 	"internal/abi"
 	"internal/cpu"
 	"internal/goarch"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
@@ -34,7 +35,7 @@ func memhash128(p unsafe.Pointer, h uintptr) uintptr {
 
 //go:nosplit
 func memhash_varlen(p unsafe.Pointer, h uintptr) uintptr {
-	ptr := getclosureptr()
+	ptr := sys.GetClosurePtr()
 	size := *(*uintptr)(unsafe.Pointer(ptr + unsafe.Sizeof(h)))
 	return memhash(p, h, size)
 }
@@ -56,8 +57,6 @@ var useAeshash bool
 //   - github.com/outcaste-io/ristretto
 //   - github.com/puzpuzpuz/xsync/v2
 //   - github.com/puzpuzpuz/xsync/v3
-//   - github.com/segmentio/parquet-go
-//   - github.com/parquet-go/parquet-go
 //   - github.com/authzed/spicedb
 //   - github.com/pingcap/badger
 //
@@ -67,28 +66,8 @@ var useAeshash bool
 //go:linkname memhash
 func memhash(p unsafe.Pointer, h, s uintptr) uintptr
 
-// memhash32 should be an internal detail,
-// but widely used packages access it using linkname.
-// Notable members of the hall of shame include:
-//   - github.com/segmentio/parquet-go
-//   - github.com/parquet-go/parquet-go
-//
-// Do not remove or change the type signature.
-// See go.dev/issue/67401.
-//
-//go:linkname memhash32
 func memhash32(p unsafe.Pointer, h uintptr) uintptr
 
-// memhash64 should be an internal detail,
-// but widely used packages access it using linkname.
-// Notable members of the hall of shame include:
-//   - github.com/segmentio/parquet-go
-//   - github.com/parquet-go/parquet-go
-//
-// Do not remove or change the type signature.
-// See go.dev/issue/67401.
-//
-//go:linkname memhash64
 func memhash64(p unsafe.Pointer, h uintptr) uintptr
 
 // strhash should be an internal detail,
@@ -97,7 +76,6 @@ func memhash64(p unsafe.Pointer, h uintptr) uintptr
 //   - github.com/aristanetworks/goarista
 //   - github.com/bytedance/sonic
 //   - github.com/bytedance/go-tagexpr/v2
-//   - github.com/cloudwego/frugal
 //   - github.com/cloudwego/dynamicgo
 //   - github.com/v2fly/v2ray-core/v5
 //
diff --git a/src/runtime/arena.go b/src/runtime/arena.go
index cd9a9dfa..0ffc74e8 100644
--- a/src/runtime/arena.go
+++ b/src/runtime/arena.go
@@ -86,8 +86,8 @@ import (
 	"internal/abi"
 	"internal/goarch"
 	"internal/runtime/atomic"
-	"runtime/internal/math"
-	"runtime/internal/sys"
+	"internal/runtime/math"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
@@ -554,13 +554,7 @@ func userArenaHeapBitsSetType(typ *_type, ptr unsafe.Pointer, s *mspan) {
 	base := s.base()
 	h := s.writeUserArenaHeapBits(uintptr(ptr))
 
-	p := typ.GCData // start of 1-bit pointer mask (or GC program)
-	var gcProgBits uintptr
-	if typ.Kind_&abi.KindGCProg != 0 {
-		// Expand gc program, using the object itself for storage.
-		gcProgBits = runGCProg(addb(p, 4), (*byte)(ptr))
-		p = (*byte)(ptr)
-	}
+	p := getGCMask(typ) // start of 1-bit pointer mask
 	nb := typ.PtrBytes / goarch.PtrSize
 
 	for i := uintptr(0); i < nb; i += ptrBits {
@@ -585,11 +579,6 @@ func userArenaHeapBitsSetType(typ *_type, ptr unsafe.Pointer, s *mspan) {
 	h = h.pad(s, typ.Size_-typ.PtrBytes)
 	h.flush(s, uintptr(ptr), typ.Size_)
 
-	if typ.Kind_&abi.KindGCProg != 0 {
-		// Zero out temporary ptrmask buffer inside object.
-		memclrNoHeapPointers(ptr, (gcProgBits+7)/8)
-	}
-
 	// Update the PtrBytes value in the type information. After this
 	// point, the GC will observe the new bitmap.
 	s.largeType.PtrBytes = uintptr(ptr) - base + typ.PtrBytes
@@ -798,11 +787,8 @@ func newUserArenaChunk() (unsafe.Pointer, *mspan) {
 
 	if asanenabled {
 		// TODO(mknyszek): Track individual objects.
-		rzSize := computeRZlog(span.elemsize)
-		span.elemsize -= rzSize
-		span.largeType.Size_ = span.elemsize
+		// N.B. span.elemsize includes a redzone already.
 		rzStart := span.base() + span.elemsize
-		span.userArenaChunkFree = makeAddrRange(span.base(), rzStart)
 		asanpoison(unsafe.Pointer(rzStart), span.limit-rzStart)
 		asanunpoison(unsafe.Pointer(span.base()), span.elemsize)
 	}
@@ -813,8 +799,8 @@ func newUserArenaChunk() (unsafe.Pointer, *mspan) {
 			throw("newUserArenaChunk called without a P or outside bootstrapping")
 		}
 		// Note cache c only valid while m acquired; see #47302
-		if rate != 1 && userArenaChunkBytes < c.nextSample {
-			c.nextSample -= userArenaChunkBytes
+		if rate != 1 && int64(userArenaChunkBytes) < c.nextSample {
+			c.nextSample -= int64(userArenaChunkBytes)
 		} else {
 			profilealloc(mp, unsafe.Pointer(span.base()), userArenaChunkBytes)
 		}
@@ -1067,6 +1053,11 @@ func (h *mheap) allocUserArenaChunk() *mspan {
 	s.freeindex = 1
 	s.allocCount = 1
 
+	// Adjust size to include redzone.
+	if asanenabled {
+		s.elemsize -= redZoneSize(s.elemsize)
+	}
+
 	// Account for this new arena chunk memory.
 	gcController.heapInUse.add(int64(userArenaChunkBytes))
 	gcController.heapReleased.add(-int64(userArenaChunkBytes))
@@ -1088,7 +1079,7 @@ func (h *mheap) allocUserArenaChunk() *mspan {
 
 	// This must clear the entire heap bitmap so that it's safe
 	// to allocate noscan data without writing anything out.
-	s.initHeapBits(true)
+	s.initHeapBits()
 
 	// Clear the span preemptively. It's an arena chunk, so let's assume
 	// everything is going to be used.
diff --git a/src/runtime/asan.go b/src/runtime/asan.go
index d79637a3..6fb1d00c 100644
--- a/src/runtime/asan.go
+++ b/src/runtime/asan.go
@@ -7,19 +7,20 @@
 package runtime
 
 import (
+	"internal/runtime/sys"
 	"unsafe"
 )
 
 // Public address sanitizer API.
 func ASanRead(addr unsafe.Pointer, len int) {
-	sp := getcallersp()
-	pc := getcallerpc()
+	sp := sys.GetCallerSP()
+	pc := sys.GetCallerPC()
 	doasanread(addr, uintptr(len), sp, pc)
 }
 
 func ASanWrite(addr unsafe.Pointer, len int) {
-	sp := getcallersp()
-	pc := getcallerpc()
+	sp := sys.GetCallerSP()
+	pc := sys.GetCallerPC()
 	doasanwrite(addr, uintptr(len), sp, pc)
 }
 
@@ -32,16 +33,16 @@ const asanenabled = true
 //go:linkname asanread
 //go:nosplit
 func asanread(addr unsafe.Pointer, sz uintptr) {
-	sp := getcallersp()
-	pc := getcallerpc()
+	sp := sys.GetCallerSP()
+	pc := sys.GetCallerPC()
 	doasanread(addr, sz, sp, pc)
 }
 
 //go:linkname asanwrite
 //go:nosplit
 func asanwrite(addr unsafe.Pointer, sz uintptr) {
-	sp := getcallersp()
-	pc := getcallerpc()
+	sp := sys.GetCallerSP()
+	pc := sys.GetCallerPC()
 	doasanwrite(addr, sz, sp, pc)
 }
 
diff --git a/src/runtime/asm_loong64.s b/src/runtime/asm_loong64.s
index c16b27a0..1c5ced45 100644
--- a/src/runtime/asm_loong64.s
+++ b/src/runtime/asm_loong64.s
@@ -69,6 +69,10 @@ nocgo:
 	// start this M
 	JAL	runtime·mstart(SB)
 
+	// Prevent dead-code elimination of debugCallV2, which is
+	// intended to be called by debuggers.
+	MOVV	$runtime·debugCallV2(SB), R0
+
 	MOVV	R0, 1(R0)
 	RET
 
@@ -87,9 +91,8 @@ TEXT runtime·mstart(SB),NOSPLIT|TOPFRAME,$0
 	RET // not reached
 
 // func cputicks() int64
-TEXT runtime·cputicks(SB),NOSPLIT,$0-8
+TEXT runtime·cputicks(SB),NOSPLIT,$0-8
 	RDTIMED	R0, R4
-	MOVV	R4, ret+0(FP)
 	RET
 
 /*
@@ -209,19 +212,19 @@ noswitch:
 	JMP	(R4)
 
 // func switchToCrashStack0(fn func())
-TEXT runtime·switchToCrashStack0(SB), NOSPLIT, $0-8
-	MOVV	fn+0(FP), REGCTXT	// context register
-	MOVV	g_m(g), R4	// curm
+TEXT runtime·switchToCrashStack0(SB),NOSPLIT,$0-8
+	MOVV	R4, REGCTXT	// context register
+	MOVV	g_m(g), R5	// curm
 
 	// set g to gcrash
 	MOVV	$runtime·gcrash(SB), g	// g = &gcrash
 	JAL	runtime·save_g(SB)
-	MOVV	R4, g_m(g)	// g.m = curm
-	MOVV	g, m_g0(R4)	// curm.g0 = g
+	MOVV	R5, g_m(g)	// g.m = curm
+	MOVV	g, m_g0(R5)	// curm.g0 = g
 
 	// switch to crashstack
-	MOVV	(g_stack+stack_hi)(g), R4
-	ADDV	$(-4*8), R4, R3
+	MOVV	(g_stack+stack_hi)(g), R5
+	ADDV	$(-4*8), R5, R3
 
 	// call target function
 	MOVV	0(REGCTXT), R6
@@ -344,32 +347,65 @@ TEXT NAME(SB), WRAPPER, $MAXSIZE-48;		\
 	NO_LOCAL_POINTERS;			\
 	/* copy arguments to stack */		\
 	MOVV	arg+16(FP), R4;			\
-	MOVWU	argsize+24(FP), R5;			\
-	MOVV	R3, R12;				\
+	MOVWU	argsize+24(FP), R5;		\
+	MOVV	R3, R12;			\
+	MOVV	$16, R13;			\
 	ADDV	$8, R12;			\
-	ADDV	R12, R5;				\
-	BEQ	R12, R5, 6(PC);				\
-	MOVBU	(R4), R6;			\
-	ADDV	$1, R4;			\
-	MOVBU	R6, (R12);			\
-	ADDV	$1, R12;			\
-	JMP	-5(PC);				\
+	BLT	R5, R13, check8;		\
+	/* copy 16 bytes a time */		\
+	MOVBU	internal∕cpu·Loong64+const_offsetLOONG64HasLSX(SB), R16;	\
+	BEQ	R16, copy16_again;		\
+loop16:;					\
+	VMOVQ	(R4), V0;			\
+	ADDV	$16, R4;			\
+	ADDV	$-16, R5;			\
+	VMOVQ	V0, (R12);			\
+	ADDV	$16, R12;			\
+	BGE	R5, R13, loop16;		\
+	JMP	check8;				\
+copy16_again:;					\
+	MOVV	(R4), R14;			\
+	MOVV	8(R4), R15;			\
+	ADDV	$16, R4;			\
+	ADDV	$-16, R5;			\
+	MOVV	R14, (R12);			\
+	MOVV	R15, 8(R12);			\
+	ADDV	$16, R12;			\
+	BGE	R5, R13, copy16_again;		\
+check8:;					\
+	/* R13 = 8 */;				\
+	SRLV	$1, R13;			\
+	BLT	R5, R13, 6(PC);			\
+	/* copy 8 bytes a time */		\
+	MOVV	(R4), R14;			\
+	ADDV	$8, R4;				\
+	ADDV	$-8, R5;			\
+	MOVV	R14, (R12);			\
+	ADDV	$8, R12;			\
+	BEQ     R5, R0, 7(PC);  		\
+	/* copy 1 byte a time for the rest */	\
+	MOVBU   (R4), R14;      		\
+	ADDV    $1, R4;         		\
+	ADDV    $-1, R5;        		\
+	MOVBU   R14, (R12);     		\
+	ADDV    $1, R12;        		\
+	JMP     -6(PC);         		\
 	/* set up argument registers */		\
 	MOVV	regArgs+40(FP), R25;		\
 	JAL	·unspillArgs(SB);		\
 	/* call function */			\
-	MOVV	f+8(FP), REGCTXT;			\
+	MOVV	f+8(FP), REGCTXT;		\
 	MOVV	(REGCTXT), R25;			\
 	PCDATA  $PCDATA_StackMapIndex, $0;	\
 	JAL	(R25);				\
 	/* copy return values back */		\
 	MOVV	regArgs+40(FP), R25;		\
-	JAL	·spillArgs(SB);		\
+	JAL	·spillArgs(SB);			\
 	MOVV	argtype+0(FP), R7;		\
 	MOVV	arg+16(FP), R4;			\
 	MOVWU	n+24(FP), R5;			\
 	MOVWU	retoffset+28(FP), R6;		\
-	ADDV	$8, R3, R12;				\
+	ADDV	$8, R3, R12;			\
 	ADDV	R6, R12; 			\
 	ADDV	R6, R4;				\
 	SUBVU	R6, R5;				\
@@ -882,6 +918,229 @@ TEXT runtime·gcWriteBarrier8(SB),NOSPLIT,$0
 	MOVV	$64, R29
 	JMP	gcWriteBarrier<>(SB)
 
+DATA	debugCallFrameTooLarge<>+0x00(SB)/20, $"call frame too large"
+GLOBL	debugCallFrameTooLarge<>(SB), RODATA, $20	// Size duplicated below
+
+// debugCallV2 is the entry point for debugger-injected function
+// calls on running goroutines. It informs the runtime that a
+// debug call has been injected and creates a call frame for the
+// debugger to fill in.
+//
+// To inject a function call, a debugger should:
+// 1. Check that the goroutine is in state _Grunning and that
+//    there are at least 280 bytes free on the stack.
+// 2. Set SP as SP-8.
+// 3. Store the current LR in (SP) (using the SP after step 2).
+// 4. Store the current PC in the LR register.
+// 5. Write the desired argument frame size at SP-8
+// 6. Save all machine registers so they can be restored later by the debugger.
+// 7. Set the PC to debugCallV2 and resume execution.
+//
+// If the goroutine is in state _Grunnable, then it's not generally
+// safe to inject a call because it may return out via other runtime
+// operations. Instead, the debugger should unwind the stack to find
+// the return to non-runtime code, add a temporary breakpoint there,
+// and inject the call once that breakpoint is hit.
+//
+// If the goroutine is in any other state, it's not safe to inject a call.
+//
+// This function communicates back to the debugger by setting R19 and
+// invoking BREAK to raise a breakpoint signal. Note that the signal PC of
+// the signal triggered by the BREAK instruction is the PC where the signal
+// is trapped, not the next PC, so to resume execution, the debugger needs
+// to set the signal PC to PC+4. See the comments in the implementation for
+// the protocol the debugger is expected to follow. InjectDebugCall in the
+// runtime tests demonstrates this protocol.
+//
+// The debugger must ensure that any pointers passed to the function
+// obey escape analysis requirements. Specifically, it must not pass
+// a stack pointer to an escaping argument. debugCallV2 cannot check
+// this invariant.
+//
+// This is ABIInternal because Go code injects its PC directly into new
+// goroutine stacks.
+TEXT runtime·debugCallV2(SB),NOSPLIT|NOFRAME,$0-0
+	MOVV    R1, -272(R3)
+	ADDV    $-272, R3
+
+	// We can't do anything that might clobber any of these
+	// registers before this.
+	MOVV    R2, (4*8)(R3)
+	MOVV    R4, (5*8)(R3)
+	MOVV    R5, (6*8)(R3)
+	MOVV    R6, (7*8)(R3)
+	MOVV    R7, (8*8)(R3)
+	MOVV    R8, (9*8)(R3)
+	MOVV    R9, (10*8)(R3)
+	MOVV    R10, (11*8)(R3)
+	MOVV    R11, (12*8)(R3)
+	MOVV    R12, (13*8)(R3)
+	MOVV    R13, (14*8)(R3)
+	MOVV    R14, (15*8)(R3)
+	MOVV    R15, (16*8)(R3)
+	MOVV    R16, (17*8)(R3)
+	MOVV    R17, (18*8)(R3)
+	MOVV    R18, (19*8)(R3)
+	MOVV    R19, (20*8)(R3)
+	MOVV    R20, (21*8)(R3)
+	MOVV    R21, (22*8)(R3)
+	MOVV    g, (23*8)(R3)
+	MOVV    R23, (24*8)(R3)
+	MOVV    R24, (25*8)(R3)
+	MOVV    R25, (26*8)(R3)
+	MOVV    R26, (27*8)(R3)
+	MOVV    R27, (28*8)(R3)
+	MOVV    R28, (29*8)(R3)
+	MOVV    R29, (30*8)(R3)
+	MOVV    R30, (31*8)(R3)
+	MOVV    R31, (32*8)(R3)
+
+	// Perform a safe-point check.
+	MOVV    R1, 8(R3)
+	CALL    runtime·debugCallCheck(SB)
+	MOVV    16(R3), R30
+	BEQ R30, good
+
+	// The safety check failed. Put the reason string at the top
+	// of the stack.
+	MOVV    R30, 8(R3)
+
+	MOVV    24(R3), R30
+	MOVV    R30, 16(R3)
+
+	MOVV    $8, R19
+	BREAK
+	JMP restore
+
+good:
+	// Registers are saved and it's safe to make a call.
+	// Open up a call frame, moving the stack if necessary.
+	//
+	// Once the frame is allocated, this will set R19 to 0 and
+	// invoke BREAK. The debugger should write the argument
+	// frame for the call at SP+8, set up argument registers,
+	// set the LR as the signal PC + 4, set the PC to the function
+	// to call, set R29 to point to the closure (if a closure call),
+	// and resume execution.
+	//
+	// If the function returns, this will set R19 to 1 and invoke
+	// BREAK. The debugger can then inspect any return value saved
+	// on the stack at SP+8 and in registers. To resume execution,
+	// the debugger should restore the LR from (SP).
+	//
+	// If the function panics, this will set R19 to 2 and invoke BREAK.
+	// The interface{} value of the panic will be at SP+8. The debugger
+	// can inspect the panic value and resume execution again.
+#define DEBUG_CALL_DISPATCH(NAME,MAXSIZE)	\
+	MOVV    $MAXSIZE, R27;         \
+	BLT R27, R30, 5(PC);            \
+	MOVV    $NAME(SB), R28;			\
+	MOVV    R28, 8(R3);			\
+	CALL    runtime·debugCallWrap(SB);	\
+	JMP restore
+
+	MOVV    264(R3), R30 // the argument frame size
+	DEBUG_CALL_DISPATCH(debugCall32<>, 32)
+	DEBUG_CALL_DISPATCH(debugCall64<>, 64)
+	DEBUG_CALL_DISPATCH(debugCall128<>, 128)
+	DEBUG_CALL_DISPATCH(debugCall256<>, 256)
+	DEBUG_CALL_DISPATCH(debugCall512<>, 512)
+	DEBUG_CALL_DISPATCH(debugCall1024<>, 1024)
+	DEBUG_CALL_DISPATCH(debugCall2048<>, 2048)
+	DEBUG_CALL_DISPATCH(debugCall4096<>, 4096)
+	DEBUG_CALL_DISPATCH(debugCall8192<>, 8192)
+	DEBUG_CALL_DISPATCH(debugCall16384<>, 16384)
+	DEBUG_CALL_DISPATCH(debugCall32768<>, 32768)
+	DEBUG_CALL_DISPATCH(debugCall65536<>, 65536)
+	// The frame size is too large. Report the error.
+	MOVV    $debugCallFrameTooLarge<>(SB), R30
+	MOVV    R30, 8(R3)
+	MOVV    $20, R30
+	MOVV    R30, 16(R3) // length of debugCallFrameTooLarge string
+	MOVV    $8, R19
+	BREAK
+	JMP restore
+
+restore:
+	// Calls and failures resume here.
+	//
+	// Set R19 to 16 and invoke BREAK. The debugger should restore
+	// all registers except for PC and SP and resume execution.
+	MOVV    $16, R19
+	BREAK
+	// We must not modify flags after this point.
+
+	// Restore pointer-containing registers, which may have been
+	// modified from the debugger's copy by stack copying.
+	MOVV    (4*8)(R3), R2
+	MOVV    (5*8)(R3), R4
+	MOVV    (6*8)(R3), R5
+	MOVV    (7*8)(R3), R6
+	MOVV    (8*8)(R3), R7
+	MOVV    (9*8)(R3), R8
+	MOVV    (10*8)(R3), R9
+	MOVV    (11*8)(R3), R10
+	MOVV    (12*8)(R3), R11
+	MOVV    (13*8)(R3), R12
+	MOVV    (14*8)(R3), R13
+	MOVV    (15*8)(R3), R14
+	MOVV    (16*8)(R3), R15
+	MOVV    (17*8)(R3), R16
+	MOVV    (18*8)(R3), R17
+	MOVV    (19*8)(R3), R18
+	MOVV    (20*8)(R3), R19
+	MOVV    (21*8)(R3), R20
+	MOVV    (22*8)(R3), R21
+	MOVV    (23*8)(R3), g
+	MOVV    (24*8)(R3), R23
+	MOVV    (25*8)(R3), R24
+	MOVV    (26*8)(R3), R25
+	MOVV    (27*8)(R3), R26
+	MOVV    (28*8)(R3), R27
+	MOVV    (29*8)(R3), R28
+	MOVV    (30*8)(R3), R29
+	MOVV    (31*8)(R3), R30
+	MOVV    (32*8)(R3), R31
+
+	MOVV    0(R3), R30
+	ADDV    $280, R3 // Add 8 more bytes, see saveSigContext
+	MOVV    -8(R3), R1
+	JMP (R30)
+
+// runtime.debugCallCheck assumes that functions defined with the
+// DEBUG_CALL_FN macro are safe points to inject calls.
+#define DEBUG_CALL_FN(NAME,MAXSIZE)		\
+TEXT NAME(SB),WRAPPER,$MAXSIZE-0;		\
+	NO_LOCAL_POINTERS;		\
+	MOVV    $0, R19;		\
+	BREAK;		\
+	MOVV    $1, R19;		\
+	BREAK;		\
+	RET
+DEBUG_CALL_FN(debugCall32<>, 32)
+DEBUG_CALL_FN(debugCall64<>, 64)
+DEBUG_CALL_FN(debugCall128<>, 128)
+DEBUG_CALL_FN(debugCall256<>, 256)
+DEBUG_CALL_FN(debugCall512<>, 512)
+DEBUG_CALL_FN(debugCall1024<>, 1024)
+DEBUG_CALL_FN(debugCall2048<>, 2048)
+DEBUG_CALL_FN(debugCall4096<>, 4096)
+DEBUG_CALL_FN(debugCall8192<>, 8192)
+DEBUG_CALL_FN(debugCall16384<>, 16384)
+DEBUG_CALL_FN(debugCall32768<>, 32768)
+DEBUG_CALL_FN(debugCall65536<>, 65536)
+
+// func debugCallPanicked(val interface{})
+TEXT runtime·debugCallPanicked(SB),NOSPLIT,$16-16
+	// Copy the panic value to the top of stack at SP+8.
+	MOVV    val_type+0(FP), R30
+	MOVV    R30, 8(R3)
+	MOVV    val_data+8(FP), R30
+	MOVV    R30, 16(R3)
+	MOVV    $2, R19
+	BREAK
+	RET
+
 // Note: these functions use a special calling convention to save generated code space.
 // Arguments are passed in registers, but the space for those arguments are allocated
 // in the caller's stack frame. These stubs write the args into that stack space and
diff --git a/src/runtime/asm_riscv64.h b/src/runtime/asm_riscv64.h
new file mode 100644
index 00000000..d4deb093
--- /dev/null
+++ b/src/runtime/asm_riscv64.h
@@ -0,0 +1,12 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Define features that are guaranteed to be supported by setting the GORISCV64 variable.
+// If a feature is supported, there's no need to check it at runtime every time.
+
+#ifdef GORISCV64_rva22u64
+#define hasZba
+#define hasZbb
+#define hasZbs
+#endif
diff --git a/src/runtime/asm_riscv64.s b/src/runtime/asm_riscv64.s
index 491635b1..ef654a3a 100644
--- a/src/runtime/asm_riscv64.s
+++ b/src/runtime/asm_riscv64.s
@@ -80,12 +80,11 @@ TEXT setg_gcc<>(SB),NOSPLIT,$0-0
 	RET
 
 // func cputicks() int64
-TEXT runtime·cputicks(SB),NOSPLIT,$0-8
+TEXT runtime·cputicks(SB),NOSPLIT,$0-0
 	// RDTIME to emulate cpu ticks
 	// RDCYCLE reads counter that is per HART(core) based
 	// according to the riscv manual, see issue 46737
-	RDTIME	A0
-	MOV	A0, ret+0(FP)
+	RDTIME	X10
 	RET
 
 // systemstack_switch is a dummy routine that systemstack leaves at the bottom
diff --git a/src/runtime/asm_wasm.s b/src/runtime/asm_wasm.s
index b44a4f7d..69da583a 100644
--- a/src/runtime/asm_wasm.s
+++ b/src/runtime/asm_wasm.s
@@ -554,5 +554,73 @@ TEXT wasm_pc_f_loop(SB),NOSPLIT,$0
 
 	Return
 
+// wasm_pc_f_loop_export is like wasm_pc_f_loop, except that this takes an
+// argument (on Wasm stack) that is a PC_F, and the loop stops when we get
+// to that PC in a normal return (not unwinding).
+// This is for handling an wasmexport function when it needs to switch the
+// stack.
+TEXT wasm_pc_f_loop_export(SB),NOSPLIT,$0
+	Get PAUSE
+	I32Eqz
+outer:
+	If
+		// R1 is whether a function return normally (0) or unwinding (1).
+		// Start with unwinding.
+		I32Const $1
+		Set R1
+	loop:
+		Loop
+			// Get PC_F & PC_B from -8(SP)
+			Get SP
+			I32Const $8
+			I32Sub
+			I32Load16U $2 // PC_F
+			Tee R2
+
+			Get R0
+			I32Eq
+			If // PC_F == R0, we're at the stop PC
+				Get R1
+				I32Eqz
+				// Break if it is a normal return
+				BrIf outer // actually jump to after the corresponding End
+			End
+
+			Get SP
+			I32Const $8
+			I32Sub
+			I32Load16U $0 // PC_B
+
+			Get R2 // PC_F
+			CallIndirect $0
+			Set R1 // save return/unwinding state for next iteration
+
+			Get PAUSE
+			I32Eqz
+			BrIf loop
+		End
+	End
+
+	I32Const $0
+	Set PAUSE
+
+	Return
+
 TEXT wasm_export_lib(SB),NOSPLIT,$0
 	UNDEF
+
+TEXT runtime·pause(SB), NOSPLIT, $0-8
+	MOVD newsp+0(FP), SP
+	I32Const $1
+	Set PAUSE
+	RETUNWIND
+
+// Called if a wasmexport function is called before runtime initialization
+TEXT runtime·notInitialized(SB), NOSPLIT, $0
+	MOVD $runtime·wasmStack+(m0Stack__size-16-8)(SB), SP
+	I32Const $0 // entry PC_B
+	Call runtime·notInitialized1(SB)
+	Drop
+	I32Const $0 // entry PC_B
+	Call runtime·abort(SB)
+	UNDEF
diff --git a/src/runtime/atomic_loong64.s b/src/runtime/atomic_loong64.s
index 4818a827..5332d36f 100644
--- a/src/runtime/atomic_loong64.s
+++ b/src/runtime/atomic_loong64.s
@@ -5,5 +5,5 @@
 #include "textflag.h"
 
 TEXT ·publicationBarrier(SB),NOSPLIT|NOFRAME,$0-0
-	DBAR
+	DBAR	$0x1A // StoreStore barrier
 	RET
diff --git a/src/runtime/bitcursor_test.go b/src/runtime/bitcursor_test.go
new file mode 100644
index 00000000..3a4c7d0f
--- /dev/null
+++ b/src/runtime/bitcursor_test.go
@@ -0,0 +1,49 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package runtime_test
+
+import (
+	. "runtime"
+	"testing"
+)
+
+func TestBitCursor(t *testing.T) {
+	ones := [5]byte{0xff, 0xff, 0xff, 0xff, 0xff}
+	zeros := [5]byte{0, 0, 0, 0, 0}
+
+	for start := uintptr(0); start < 16; start++ {
+		for end := start + 1; end < 32; end++ {
+			buf := zeros
+			NewBitCursor(&buf[0]).Offset(start).Write(&ones[0], end-start)
+
+			for i := uintptr(0); i < uintptr(len(buf)*8); i++ {
+				bit := buf[i/8] >> (i % 8) & 1
+				if bit == 0 && i >= start && i < end {
+					t.Errorf("bit %d not set in [%d:%d]", i, start, end)
+				}
+				if bit == 1 && (i < start || i >= end) {
+					t.Errorf("bit %d is set outside [%d:%d]", i, start, end)
+				}
+			}
+		}
+	}
+
+	for start := uintptr(0); start < 16; start++ {
+		for end := start + 1; end < 32; end++ {
+			buf := ones
+			NewBitCursor(&buf[0]).Offset(start).Write(&zeros[0], end-start)
+
+			for i := uintptr(0); i < uintptr(len(buf)*8); i++ {
+				bit := buf[i/8] >> (i % 8) & 1
+				if bit == 1 && i >= start && i < end {
+					t.Errorf("bit %d not cleared in [%d:%d]", i, start, end)
+				}
+				if bit == 0 && (i < start || i >= end) {
+					t.Errorf("bit %d cleared outside [%d:%d]", i, start, end)
+				}
+			}
+		}
+	}
+}
diff --git a/src/runtime/callers_test.go b/src/runtime/callers_test.go
index 49a1d5a6..9429442f 100644
--- a/src/runtime/callers_test.go
+++ b/src/runtime/callers_test.go
@@ -5,8 +5,8 @@
 package runtime_test
 
 import (
-	"reflect"
 	"runtime"
+	"slices"
 	"strings"
 	"testing"
 )
@@ -80,7 +80,7 @@ func testCallersEqual(t *testing.T, pcs []uintptr, want []string) {
 		}
 		got = append(got, frame.Function)
 	}
-	if !reflect.DeepEqual(want, got) {
+	if !slices.Equal(want, got) {
 		t.Fatalf("wanted %v, got %v", want, got)
 	}
 }
diff --git a/src/runtime/cgo.go b/src/runtime/cgo.go
index 8285d87f..eca905ba 100644
--- a/src/runtime/cgo.go
+++ b/src/runtime/cgo.go
@@ -72,11 +72,20 @@ var cgoHasExtraM bool
 // cgoUse should not actually be called (see cgoAlwaysFalse).
 func cgoUse(any) { throw("cgoUse should not be called") }
 
+// cgoKeepAlive is called by cgo-generated code (using go:linkname to get at
+// an unexported name). This call keeps its argument alive until the call site;
+// cgo emits the call after the last possible use of the argument by C code.
+// cgoKeepAlive is marked in the cgo-generated code as //go:noescape, so
+// unlike cgoUse it does not force the argument to escape to the heap.
+// This is used to implement the #cgo noescape directive.
+func cgoKeepAlive(any) { throw("cgoKeepAlive should not be called") }
+
 // cgoAlwaysFalse is a boolean value that is always false.
-// The cgo-generated code says if cgoAlwaysFalse { cgoUse(p) }.
+// The cgo-generated code says if cgoAlwaysFalse { cgoUse(p) },
+// or if cgoAlwaysFalse { cgoKeepAlive(p) }.
 // The compiler cannot see that cgoAlwaysFalse is always false,
 // so it emits the test and keeps the call, giving the desired
-// escape analysis result. The test is cheaper than the call.
+// escape/alive analysis result. The test is cheaper than the call.
 var cgoAlwaysFalse bool
 
 var cgo_yield = &_cgo_yield
diff --git a/src/runtime/cgo/cgo.go b/src/runtime/cgo/cgo.go
index 1e3a5029..c37135fb 100644
--- a/src/runtime/cgo/cgo.go
+++ b/src/runtime/cgo/cgo.go
@@ -32,7 +32,7 @@ package cgo
 */
 import "C"
 
-import "runtime/internal/sys"
+import "internal/runtime/sys"
 
 // Incomplete is used specifically for the semantics of incomplete C types.
 type Incomplete struct {
diff --git a/src/runtime/cgo/gcc_darwin_amd64.c b/src/runtime/cgo/gcc_darwin_amd64.c
index 5b5e369f..1ffbbd75 100644
--- a/src/runtime/cgo/gcc_darwin_amd64.c
+++ b/src/runtime/cgo/gcc_darwin_amd64.c
@@ -34,6 +34,7 @@ _cgo_sys_thread_start(ThreadStart *ts)
 	size = pthread_get_stacksize_np(pthread_self());
 	pthread_attr_init(&attr);
 	pthread_attr_setstacksize(&attr, size);
+	pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
 	// Leave stacklo=0 and set stackhi=size; mstart will do the rest.
 	ts->g->stackhi = size;
 	err = _cgo_try_pthread_create(&p, &attr, threadentry, ts);
diff --git a/src/runtime/cgo/gcc_darwin_arm64.c b/src/runtime/cgo/gcc_darwin_arm64.c
index f1344de8..4b346929 100644
--- a/src/runtime/cgo/gcc_darwin_arm64.c
+++ b/src/runtime/cgo/gcc_darwin_arm64.c
@@ -39,6 +39,7 @@ _cgo_sys_thread_start(ThreadStart *ts)
 	size = pthread_get_stacksize_np(pthread_self());
 	pthread_attr_init(&attr);
 	pthread_attr_setstacksize(&attr, size);
+	pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
 	// Leave stacklo=0 and set stackhi=size; mstart will do the rest.
 	ts->g->stackhi = size;
 	err = _cgo_try_pthread_create(&p, &attr, threadentry, ts);
diff --git a/src/runtime/cgo/gcc_dragonfly_amd64.c b/src/runtime/cgo/gcc_dragonfly_amd64.c
index 009d4b4f..646e9e65 100644
--- a/src/runtime/cgo/gcc_dragonfly_amd64.c
+++ b/src/runtime/cgo/gcc_dragonfly_amd64.c
@@ -33,6 +33,7 @@ _cgo_sys_thread_start(ThreadStart *ts)
 	pthread_sigmask(SIG_SETMASK, &ign, &oset);
 
 	pthread_attr_init(&attr);
+	pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
 	pthread_attr_getstacksize(&attr, &size);
 
 	// Leave stacklo=0 and set stackhi=size; mstart will do the rest.
diff --git a/src/runtime/cgo/gcc_freebsd.c b/src/runtime/cgo/gcc_freebsd.c
index a9412113..1cc582a3 100644
--- a/src/runtime/cgo/gcc_freebsd.c
+++ b/src/runtime/cgo/gcc_freebsd.c
@@ -45,6 +45,7 @@ _cgo_sys_thread_start(ThreadStart *ts)
 	pthread_sigmask(SIG_SETMASK, &ign, &oset);
 
 	pthread_attr_init(&attr);
+	pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
 	pthread_attr_getstacksize(&attr, &size);
 	// Leave stacklo=0 and set stackhi=size; mstart will do the rest.
 	ts->g->stackhi = size;
diff --git a/src/runtime/cgo/gcc_freebsd_amd64.c b/src/runtime/cgo/gcc_freebsd_amd64.c
index 31905f2a..ec23a00f 100644
--- a/src/runtime/cgo/gcc_freebsd_amd64.c
+++ b/src/runtime/cgo/gcc_freebsd_amd64.c
@@ -43,6 +43,7 @@ _cgo_sys_thread_start(ThreadStart *ts)
 	pthread_sigmask(SIG_SETMASK, &ign, &oset);
 
 	pthread_attr_init(&attr);
+	pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
 	pthread_attr_getstacksize(&attr, &size);
 	// Leave stacklo=0 and set stackhi=size; mstart will do the rest.
 	ts->g->stackhi = size;
diff --git a/src/runtime/cgo/gcc_libinit.c b/src/runtime/cgo/gcc_libinit.c
index 33a9ff93..2fe76e43 100644
--- a/src/runtime/cgo/gcc_libinit.c
+++ b/src/runtime/cgo/gcc_libinit.c
@@ -37,8 +37,12 @@ static void (*cgo_context_function)(struct context_arg*);
 
 void
 x_cgo_sys_thread_create(void* (*func)(void*), void* arg) {
+	pthread_attr_t attr;
 	pthread_t p;
-	int err = _cgo_try_pthread_create(&p, NULL, func, arg);
+
+	pthread_attr_init(&attr);
+	pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
+	int err = _cgo_try_pthread_create(&p, &attr, func, arg);
 	if (err != 0) {
 		fprintf(stderr, "pthread_create failed: %s", strerror(err));
 		abort();
@@ -153,7 +157,6 @@ _cgo_try_pthread_create(pthread_t* thread, const pthread_attr_t* attr, void* (*p
 	for (tries = 0; tries < 20; tries++) {
 		err = pthread_create(thread, attr, pfn, arg);
 		if (err == 0) {
-			pthread_detach(*thread);
 			return 0;
 		}
 		if (err != EAGAIN) {
diff --git a/src/runtime/cgo/gcc_libinit_windows.c b/src/runtime/cgo/gcc_libinit_windows.c
index 9a8c65ea..ddc0ad70 100644
--- a/src/runtime/cgo/gcc_libinit_windows.c
+++ b/src/runtime/cgo/gcc_libinit_windows.c
@@ -2,6 +2,12 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+# ifdef __CYGWIN__
+#error "don't use the cygwin compiler to build native Windows programs; use MinGW instead"
+#else
+// Exclude the following code from Cygwin builds.
+// Cygwin doesn't implement process.h nor does it support _beginthread.
+
 #define WIN32_LEAN_AND_MEAN
 #include 
 #include 
@@ -156,3 +162,5 @@ void _cgo_beginthread(void (*func)(void*), void* arg) {
 	fprintf(stderr, "runtime: failed to create new OS thread (%d)\n", errno);
 	abort();
 }
+
+#endif // __CYGWIN__
\ No newline at end of file
diff --git a/src/runtime/cgo/gcc_linux.c b/src/runtime/cgo/gcc_linux.c
index 9624df59..fbdb5e65 100644
--- a/src/runtime/cgo/gcc_linux.c
+++ b/src/runtime/cgo/gcc_linux.c
@@ -40,6 +40,7 @@ _cgo_sys_thread_start(ThreadStart *ts)
 	pthread_sigmask(SIG_SETMASK, &ign, &oset);
 
 	pthread_attr_init(&attr);
+	pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
 	pthread_attr_getstacksize(&attr, &size);
 	// Leave stacklo=0 and set stackhi=size; mstart will do the rest.
 	ts->g->stackhi = size;
diff --git a/src/runtime/cgo/gcc_linux_amd64.c b/src/runtime/cgo/gcc_linux_amd64.c
index dcb596e2..c81fde28 100644
--- a/src/runtime/cgo/gcc_linux_amd64.c
+++ b/src/runtime/cgo/gcc_linux_amd64.c
@@ -63,6 +63,7 @@ _cgo_sys_thread_start(ThreadStart *ts)
 	pthread_sigmask(SIG_SETMASK, &ign, &oset);
 
 	pthread_attr_init(&attr);
+	pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
 	pthread_attr_getstacksize(&attr, &size);
 	// Leave stacklo=0 and set stackhi=size; mstart will do the rest.
 	ts->g->stackhi = size;
diff --git a/src/runtime/cgo/gcc_linux_arm64.c b/src/runtime/cgo/gcc_linux_arm64.c
index 0dcff2c0..ce46804b 100644
--- a/src/runtime/cgo/gcc_linux_arm64.c
+++ b/src/runtime/cgo/gcc_linux_arm64.c
@@ -28,6 +28,7 @@ _cgo_sys_thread_start(ThreadStart *ts)
 	pthread_sigmask(SIG_SETMASK, &ign, &oset);
 
 	pthread_attr_init(&attr);
+	pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
 	pthread_attr_getstacksize(&attr, &size);
 	// Leave stacklo=0 and set stackhi=size; mstart will do the rest.
 	ts->g->stackhi = size;
diff --git a/src/runtime/cgo/gcc_linux_s390x.c b/src/runtime/cgo/gcc_linux_s390x.c
index 4b9f76c3..1fae4e7d 100644
--- a/src/runtime/cgo/gcc_linux_s390x.c
+++ b/src/runtime/cgo/gcc_linux_s390x.c
@@ -33,6 +33,7 @@ _cgo_sys_thread_start(ThreadStart *ts)
 	pthread_sigmask(SIG_SETMASK, &ign, &oset);
 
 	pthread_attr_init(&attr);
+	pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
 	pthread_attr_getstacksize(&attr, &size);
 	// Leave stacklo=0 and set stackhi=size; mstart will do the rest.
 	ts->g->stackhi = size;
diff --git a/src/runtime/cgo/gcc_netbsd.c b/src/runtime/cgo/gcc_netbsd.c
index 16819ce8..98b629e8 100644
--- a/src/runtime/cgo/gcc_netbsd.c
+++ b/src/runtime/cgo/gcc_netbsd.c
@@ -35,6 +35,7 @@ _cgo_sys_thread_start(ThreadStart *ts)
 	pthread_sigmask(SIG_SETMASK, &ign, &oset);
 
 	pthread_attr_init(&attr);
+	pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
 	pthread_attr_getstacksize(&attr, &size);
 	// Leave stacklo=0 and set stackhi=size; mstart will do the rest.
 	ts->g->stackhi = size;
diff --git a/src/runtime/cgo/gcc_openbsd.c b/src/runtime/cgo/gcc_openbsd.c
index 3a4e5454..b31c312f 100644
--- a/src/runtime/cgo/gcc_openbsd.c
+++ b/src/runtime/cgo/gcc_openbsd.c
@@ -34,6 +34,7 @@ _cgo_sys_thread_start(ThreadStart *ts)
 	pthread_sigmask(SIG_SETMASK, &ign, &oset);
 
 	pthread_attr_init(&attr);
+	pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
 	pthread_attr_getstacksize(&attr, &size);
 
 	// Leave stacklo=0 and set stackhi=size; mstart will do the rest.
diff --git a/src/runtime/cgo/gcc_ppc64x.c b/src/runtime/cgo/gcc_ppc64x.c
index 98a65495..e1a5c14f 100644
--- a/src/runtime/cgo/gcc_ppc64x.c
+++ b/src/runtime/cgo/gcc_ppc64x.c
@@ -35,6 +35,7 @@ _cgo_sys_thread_start(ThreadStart *ts)
 	pthread_sigmask(SIG_SETMASK, &ign, &oset);
 
 	pthread_attr_init(&attr);
+	pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
 	pthread_attr_getstacksize(&attr, &size);
 	// Leave stacklo=0 and set stackhi=size; mstart will do the rest.
 	ts->g->stackhi = size;
diff --git a/src/runtime/cgo/gcc_stack_unix.c b/src/runtime/cgo/gcc_stack_unix.c
index df0049a4..9550cd78 100644
--- a/src/runtime/cgo/gcc_stack_unix.c
+++ b/src/runtime/cgo/gcc_stack_unix.c
@@ -21,7 +21,7 @@ x_cgo_getstackbound(uintptr bounds[2])
 	// Needed before pthread_getattr_np, too, since before glibc 2.32
 	// it did not call pthread_attr_init in all cases (see #65625).
 	pthread_attr_init(&attr);
-#if defined(__GLIBC__) || (defined(__sun) && !defined(__illumos__))
+#if defined(__GLIBC__) || defined(__BIONIC__) || (defined(__sun) && !defined(__illumos__))
 	// pthread_getattr_np is a GNU extension supported in glibc.
 	// Solaris is not glibc but does support pthread_getattr_np
 	// (and the fallback doesn't work...). Illumos does not.
diff --git a/src/runtime/cgocall.go b/src/runtime/cgocall.go
index 972de4fe..326674cd 100644
--- a/src/runtime/cgocall.go
+++ b/src/runtime/cgocall.go
@@ -88,7 +88,7 @@ import (
 	"internal/abi"
 	"internal/goarch"
 	"internal/goexperiment"
-	"runtime/internal/sys"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
@@ -425,6 +425,13 @@ func cgocallbackg1(fn, frame unsafe.Pointer, ctxt uintptr) {
 	restore := true
 	defer unwindm(&restore)
 
+	var ditAlreadySet bool
+	if debug.dataindependenttiming == 1 && gp.m.isextra {
+		// We only need to enable DIT for threads that were created by C, as it
+		// should already by enabled on threads that were created by Go.
+		ditAlreadySet = sys.EnableDIT()
+	}
+
 	if raceenabled {
 		raceacquire(unsafe.Pointer(&racecgosync))
 	}
@@ -440,6 +447,11 @@ func cgocallbackg1(fn, frame unsafe.Pointer, ctxt uintptr) {
 		racereleasemerge(unsafe.Pointer(&racecgosync))
 	}
 
+	if debug.dataindependenttiming == 1 && !ditAlreadySet {
+		// Only unset DIT if it wasn't already enabled when cgocallback was called.
+		sys.DisableDIT()
+	}
+
 	// Do not unwind m->g0->sched.sp.
 	// Our caller, cgocallback, will do that.
 	restore = false
@@ -558,6 +570,17 @@ func cgoCheckPointer(ptr any, arg any) {
 			ep = aep
 			t = ep._type
 			top = false
+		case abi.Pointer:
+			// The Go code is indexing into a pointer to an array,
+			// and we have been passed the pointer-to-array.
+			// Check the array rather than the pointer.
+			pt := (*abi.PtrType)(unsafe.Pointer(aep._type))
+			t = pt.Elem
+			if t.Kind_&abi.KindMask != abi.Array {
+				throw("can't happen")
+			}
+			ep = aep
+			top = false
 		default:
 			throw("can't happen")
 		}
diff --git a/src/runtime/cgocheck.go b/src/runtime/cgocheck.go
index 3f2c2719..ab804a5a 100644
--- a/src/runtime/cgocheck.go
+++ b/src/runtime/cgocheck.go
@@ -8,7 +8,6 @@
 package runtime
 
 import (
-	"internal/abi"
 	"internal/goarch"
 	"unsafe"
 )
@@ -142,52 +141,7 @@ func cgoCheckTypedBlock(typ *_type, src unsafe.Pointer, off, size uintptr) {
 		size = ptrdataSize
 	}
 
-	if typ.Kind_&abi.KindGCProg == 0 {
-		cgoCheckBits(src, typ.GCData, off, size)
-		return
-	}
-
-	// The type has a GC program. Try to find GC bits somewhere else.
-	for _, datap := range activeModules() {
-		if cgoInRange(src, datap.data, datap.edata) {
-			doff := uintptr(src) - datap.data
-			cgoCheckBits(add(src, -doff), datap.gcdatamask.bytedata, off+doff, size)
-			return
-		}
-		if cgoInRange(src, datap.bss, datap.ebss) {
-			boff := uintptr(src) - datap.bss
-			cgoCheckBits(add(src, -boff), datap.gcbssmask.bytedata, off+boff, size)
-			return
-		}
-	}
-
-	s := spanOfUnchecked(uintptr(src))
-	if s.state.get() == mSpanManual {
-		// There are no heap bits for value stored on the stack.
-		// For a channel receive src might be on the stack of some
-		// other goroutine, so we can't unwind the stack even if
-		// we wanted to.
-		// We can't expand the GC program without extra storage
-		// space we can't easily get.
-		// Fortunately we have the type information.
-		systemstack(func() {
-			cgoCheckUsingType(typ, src, off, size)
-		})
-		return
-	}
-
-	// src must be in the regular heap.
-	tp := s.typePointersOf(uintptr(src), size)
-	for {
-		var addr uintptr
-		if tp, addr = tp.next(uintptr(src) + size); addr == 0 {
-			break
-		}
-		v := *(*unsafe.Pointer)(unsafe.Pointer(addr))
-		if cgoIsGoPointer(v) && !isPinned(v) {
-			throw(cgoWriteBarrierFail)
-		}
-	}
+	cgoCheckBits(src, getGCMask(typ), off, size)
 }
 
 // cgoCheckBits checks the block of memory at src, for up to size
@@ -245,48 +199,5 @@ func cgoCheckUsingType(typ *_type, src unsafe.Pointer, off, size uintptr) {
 		size = ptrdataSize
 	}
 
-	if typ.Kind_&abi.KindGCProg == 0 {
-		cgoCheckBits(src, typ.GCData, off, size)
-		return
-	}
-	switch typ.Kind_ & abi.KindMask {
-	default:
-		throw("can't happen")
-	case abi.Array:
-		at := (*arraytype)(unsafe.Pointer(typ))
-		for i := uintptr(0); i < at.Len; i++ {
-			if off < at.Elem.Size_ {
-				cgoCheckUsingType(at.Elem, src, off, size)
-			}
-			src = add(src, at.Elem.Size_)
-			skipped := off
-			if skipped > at.Elem.Size_ {
-				skipped = at.Elem.Size_
-			}
-			checked := at.Elem.Size_ - skipped
-			off -= skipped
-			if size <= checked {
-				return
-			}
-			size -= checked
-		}
-	case abi.Struct:
-		st := (*structtype)(unsafe.Pointer(typ))
-		for _, f := range st.Fields {
-			if off < f.Typ.Size_ {
-				cgoCheckUsingType(f.Typ, src, off, size)
-			}
-			src = add(src, f.Typ.Size_)
-			skipped := off
-			if skipped > f.Typ.Size_ {
-				skipped = f.Typ.Size_
-			}
-			checked := f.Typ.Size_ - skipped
-			off -= skipped
-			if size <= checked {
-				return
-			}
-			size -= checked
-		}
-	}
+	cgoCheckBits(src, getGCMask(typ), off, size)
 }
diff --git a/src/runtime/chan.go b/src/runtime/chan.go
index f1cd74a3..8e096537 100644
--- a/src/runtime/chan.go
+++ b/src/runtime/chan.go
@@ -20,7 +20,8 @@ package runtime
 import (
 	"internal/abi"
 	"internal/runtime/atomic"
-	"runtime/internal/math"
+	"internal/runtime/math"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
@@ -35,6 +36,7 @@ type hchan struct {
 	dataqsiz uint           // size of the circular queue
 	buf      unsafe.Pointer // points to an array of dataqsiz elements
 	elemsize uint16
+	synctest bool // true if created in a synctest bubble
 	closed   uint32
 	timer    *timer // timer feeding this chan
 	elemtype *_type // element type
@@ -111,6 +113,9 @@ func makechan(t *chantype, size int) *hchan {
 	c.elemsize = uint16(elem.Size_)
 	c.elemtype = elem
 	c.dataqsiz = uint(size)
+	if getg().syncGroup != nil {
+		c.synctest = true
+	}
 	lockInit(&c.lock, lockRankHchan)
 
 	if debugChan {
@@ -153,7 +158,7 @@ func full(c *hchan) bool {
 //
 //go:nosplit
 func chansend1(c *hchan, elem unsafe.Pointer) {
-	chansend(c, elem, true, getcallerpc())
+	chansend(c, elem, true, sys.GetCallerPC())
 }
 
 /*
@@ -185,6 +190,10 @@ func chansend(c *hchan, ep unsafe.Pointer, block bool, callerpc uintptr) bool {
 		racereadpc(c.raceaddr(), callerpc, abi.FuncPCABIInternal(chansend))
 	}
 
+	if c.synctest && getg().syncGroup == nil {
+		panic(plainError("send on synctest channel from outside bubble"))
+	}
+
 	// Fast path: check for failed non-blocking operation without acquiring the lock.
 	//
 	// After observing that the channel is not closed, we observe that the channel is
@@ -267,7 +276,11 @@ func chansend(c *hchan, ep unsafe.Pointer, block bool, callerpc uintptr) bool {
 	// changes and when we set gp.activeStackChans is not safe for
 	// stack shrinking.
 	gp.parkingOnChan.Store(true)
-	gopark(chanparkcommit, unsafe.Pointer(&c.lock), waitReasonChanSend, traceBlockChanSend, 2)
+	reason := waitReasonChanSend
+	if c.synctest {
+		reason = waitReasonSynctestChanSend
+	}
+	gopark(chanparkcommit, unsafe.Pointer(&c.lock), reason, traceBlockChanSend, 2)
 	// Ensure the value being sent is kept alive until the
 	// receiver copies it out. The sudog has a pointer to the
 	// stack object, but sudogs aren't considered as roots of the
@@ -303,6 +316,10 @@ func chansend(c *hchan, ep unsafe.Pointer, block bool, callerpc uintptr) bool {
 // sg must already be dequeued from c.
 // ep must be non-nil and point to the heap or the caller's stack.
 func send(c *hchan, sg *sudog, ep unsafe.Pointer, unlockf func(), skip int) {
+	if c.synctest && sg.g.syncGroup != getg().syncGroup {
+		unlockf()
+		panic(plainError("send on synctest channel from outside bubble"))
+	}
 	if raceenabled {
 		if c.dataqsiz == 0 {
 			racesync(c, sg)
@@ -406,7 +423,7 @@ func closechan(c *hchan) {
 	}
 
 	if raceenabled {
-		callerpc := getcallerpc()
+		callerpc := sys.GetCallerPC()
 		racewritepc(c.raceaddr(), callerpc, abi.FuncPCABIInternal(closechan))
 		racerelease(c.raceaddr())
 	}
@@ -517,6 +534,10 @@ func chanrecv(c *hchan, ep unsafe.Pointer, block bool) (selected, received bool)
 		throw("unreachable")
 	}
 
+	if c.synctest && getg().syncGroup == nil {
+		panic(plainError("receive on synctest channel from outside bubble"))
+	}
+
 	if c.timer != nil {
 		c.timer.maybeRunChan()
 	}
@@ -636,7 +657,11 @@ func chanrecv(c *hchan, ep unsafe.Pointer, block bool) (selected, received bool)
 	// changes and when we set gp.activeStackChans is not safe for
 	// stack shrinking.
 	gp.parkingOnChan.Store(true)
-	gopark(chanparkcommit, unsafe.Pointer(&c.lock), waitReasonChanReceive, traceBlockChanRecv, 2)
+	reason := waitReasonChanReceive
+	if c.synctest {
+		reason = waitReasonSynctestChanReceive
+	}
+	gopark(chanparkcommit, unsafe.Pointer(&c.lock), reason, traceBlockChanRecv, 2)
 
 	// someone woke us up
 	if mysg != gp.waiting {
@@ -672,6 +697,10 @@ func chanrecv(c *hchan, ep unsafe.Pointer, block bool) (selected, received bool)
 // sg must already be dequeued from c.
 // A non-nil ep must point to the heap or the caller's stack.
 func recv(c *hchan, sg *sudog, ep unsafe.Pointer, unlockf func(), skip int) {
+	if c.synctest && sg.g.syncGroup != getg().syncGroup {
+		unlockf()
+		panic(plainError("receive on synctest channel from outside bubble"))
+	}
 	if c.dataqsiz == 0 {
 		if raceenabled {
 			racesync(c, sg)
@@ -750,7 +779,7 @@ func chanparkcommit(gp *g, chanLock unsafe.Pointer) bool {
 //		... bar
 //	}
 func selectnbsend(c *hchan, elem unsafe.Pointer) (selected bool) {
-	return chansend(c, elem, false, getcallerpc())
+	return chansend(c, elem, false, sys.GetCallerPC())
 }
 
 // compiler implements
@@ -775,7 +804,7 @@ func selectnbrecv(elem unsafe.Pointer, c *hchan) (selected, received bool) {
 
 //go:linkname reflect_chansend reflect.chansend0
 func reflect_chansend(c *hchan, elem unsafe.Pointer, nb bool) (selected bool) {
-	return chansend(c, elem, !nb, getcallerpc())
+	return chansend(c, elem, !nb, sys.GetCallerPC())
 }
 
 //go:linkname reflect_chanrecv reflect.chanrecv
@@ -875,8 +904,11 @@ func (q *waitq) dequeue() *sudog {
 		// We use a flag in the G struct to tell us when someone
 		// else has won the race to signal this goroutine but the goroutine
 		// hasn't removed itself from the queue yet.
-		if sgp.isSelect && !sgp.g.selectDone.CompareAndSwap(0, 1) {
-			continue
+		if sgp.isSelect {
+			if !sgp.g.selectDone.CompareAndSwap(0, 1) {
+				// We lost the race to wake this goroutine.
+				continue
+			}
 		}
 
 		return sgp
diff --git a/src/runtime/coro.go b/src/runtime/coro.go
index d93817f9..f2eb8c98 100644
--- a/src/runtime/coro.go
+++ b/src/runtime/coro.go
@@ -4,7 +4,10 @@
 
 package runtime
 
-import "unsafe"
+import (
+	"internal/runtime/sys"
+	"unsafe"
+)
 
 // A coro represents extra concurrency without extra parallelism,
 // as would be needed for a coroutine implementation.
@@ -39,7 +42,7 @@ type coro struct {
 func newcoro(f func(*coro)) *coro {
 	c := new(coro)
 	c.f = f
-	pc := getcallerpc()
+	pc := sys.GetCallerPC()
 	gp := getg()
 	systemstack(func() {
 		mp := gp.m
@@ -134,6 +137,16 @@ func coroswitch_m(gp *g) {
 	// emitting an event for every single transition.
 	trace := traceAcquire()
 
+	canCAS := true
+	sg := gp.syncGroup
+	if sg != nil {
+		// If we're in a synctest group, always use casgstatus (which tracks
+		// group idleness) rather than directly CASing. Mark the group as active
+		// while we're in the process of transferring control.
+		canCAS = false
+		sg.incActive()
+	}
+
 	if locked {
 		// Detach the goroutine from the thread; we'll attach to the goroutine we're
 		// switching to before returning.
@@ -152,7 +165,7 @@ func coroswitch_m(gp *g) {
 		// If we can CAS ourselves directly from running to waiting, so do,
 		// keeping the control transfer as lightweight as possible.
 		gp.waitreason = waitReasonCoroutine
-		if !gp.atomicstatus.CompareAndSwap(_Grunning, _Gwaiting) {
+		if !canCAS || !gp.atomicstatus.CompareAndSwap(_Grunning, _Gwaiting) {
 			// The CAS failed: use casgstatus, which will take care of
 			// coordinating with the garbage collector about the state change.
 			casgstatus(gp, _Grunning, _Gwaiting)
@@ -220,7 +233,7 @@ func coroswitch_m(gp *g) {
 		tryRecordGoroutineProfile(gnext, nil, osyield)
 	}
 
-	if !gnext.atomicstatus.CompareAndSwap(_Gwaiting, _Grunning) {
+	if !canCAS || !gnext.atomicstatus.CompareAndSwap(_Gwaiting, _Grunning) {
 		// The CAS failed: use casgstatus, which will take care of
 		// coordinating with the garbage collector about the state change.
 		casgstatus(gnext, _Gwaiting, _Grunnable)
@@ -238,6 +251,10 @@ func coroswitch_m(gp *g) {
 		traceRelease(trace)
 	}
 
+	if sg != nil {
+		sg.decActive()
+	}
+
 	// Switch to gnext. Does not return.
 	gogo(&gnext.sched)
 }
diff --git a/src/runtime/coverage/coverage.go b/src/runtime/coverage/coverage.go
index 6b99a0bc..c9f725e3 100644
--- a/src/runtime/coverage/coverage.go
+++ b/src/runtime/coverage/coverage.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// Package coverage contains APIs for writing coverage profile data at runtime
+// from long-running and/or server programs that do not terminate via [os.Exit].
 package coverage
 
 import (
diff --git a/src/runtime/cpuflags.go b/src/runtime/cpuflags.go
index bbe93c5b..e81e50f5 100644
--- a/src/runtime/cpuflags.go
+++ b/src/runtime/cpuflags.go
@@ -19,6 +19,8 @@ const (
 	offsetARMHasIDIVA = unsafe.Offsetof(cpu.ARM.HasIDIVA)
 
 	offsetMIPS64XHasMSA = unsafe.Offsetof(cpu.MIPS64X.HasMSA)
+
+	offsetLOONG64HasLSX = unsafe.Offsetof(cpu.Loong64.HasLSX)
 )
 
 var (
@@ -31,4 +33,8 @@ var (
 	armHasVFPv4 bool
 
 	arm64HasATOMICS bool
+
+	loong64HasLAMCAS bool
+	loong64HasLAM_BH bool
+	loong64HasLSX    bool
 )
diff --git a/src/runtime/cpuflags_amd64.go b/src/runtime/cpuflags_amd64.go
index 8cca4bca..b6d8c6c1 100644
--- a/src/runtime/cpuflags_amd64.go
+++ b/src/runtime/cpuflags_amd64.go
@@ -8,17 +8,31 @@ import (
 	"internal/cpu"
 )
 
-var useAVXmemmove bool
+var memmoveBits uint8
+
+const (
+	// avxSupported indicates that the CPU supports AVX instructions.
+	avxSupported = 1 << 0
+
+	// repmovsPreferred indicates that REP MOVSx instruction is more
+	// efficient on the CPU.
+	repmovsPreferred = 1 << 1
+)
 
 func init() {
-	// Let's remove stepping and reserved fields
-	processor := processorVersionInfo & 0x0FFF3FF0
-
-	isIntelBridgeFamily := isIntel &&
-		processor == 0x206A0 ||
-		processor == 0x206D0 ||
-		processor == 0x306A0 ||
-		processor == 0x306E0
-
-	useAVXmemmove = cpu.X86.HasAVX && !isIntelBridgeFamily
+	// Here we assume that on modern CPUs with both FSRM and ERMS features,
+	// copying data blocks of 2KB or larger using the REP MOVSB instruction
+	// will be more efficient to avoid having to keep up with CPU generations.
+	// Therefore, we may retain a BlockList mechanism to ensure that microarchitectures
+	// that do not fit this case may appear in the future.
+	// We enable it on Intel CPUs first, and we may support more platforms
+	// in the future.
+	isERMSNiceCPU := isIntel
+	useREPMOV := isERMSNiceCPU && cpu.X86.HasERMS && cpu.X86.HasFSRM
+	if cpu.X86.HasAVX {
+		memmoveBits |= avxSupported
+	}
+	if useREPMOV {
+		memmoveBits |= repmovsPreferred
+	}
 }
diff --git a/src/runtime/cpuprof.go b/src/runtime/cpuprof.go
index 100a7825..ea4d3a8c 100644
--- a/src/runtime/cpuprof.go
+++ b/src/runtime/cpuprof.go
@@ -14,7 +14,7 @@ package runtime
 
 import (
 	"internal/abi"
-	"runtime/internal/sys"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
diff --git a/src/runtime/crash_cgo_test.go b/src/runtime/crash_cgo_test.go
index f9fbdd8f..e9b449ab 100644
--- a/src/runtime/crash_cgo_test.go
+++ b/src/runtime/crash_cgo_test.go
@@ -65,10 +65,6 @@ func TestCgoCallbackGC(t *testing.T) {
 			t.Skip("too slow for mips64x builders")
 		}
 	}
-	if testenv.Builder() == "darwin-amd64-10_14" {
-		// TODO(#23011): When the 10.14 builders are gone, remove this skip.
-		t.Skip("skipping due to platform bug on macOS 10.14; see https://golang.org/issue/43926")
-	}
 	got := runTestProg(t, "testprogcgo", "CgoCallbackGC")
 	want := "OK\n"
 	if got != want {
@@ -754,7 +750,6 @@ func TestNeedmDeadlock(t *testing.T) {
 }
 
 func TestCgoNoCallback(t *testing.T) {
-	t.Skip("TODO(#56378): enable in Go 1.23")
 	got := runTestProg(t, "testprogcgo", "CgoNoCallback")
 	want := "function marked with #cgo nocallback called back into Go"
 	if !strings.Contains(got, want) {
@@ -763,7 +758,6 @@ func TestCgoNoCallback(t *testing.T) {
 }
 
 func TestCgoNoEscape(t *testing.T) {
-	t.Skip("TODO(#56378): enable in Go 1.23")
 	got := runTestProg(t, "testprogcgo", "CgoNoEscape")
 	want := "OK\n"
 	if got != want {
@@ -771,6 +765,15 @@ func TestCgoNoEscape(t *testing.T) {
 	}
 }
 
+// Issue #63739.
+func TestCgoEscapeWithMultiplePointers(t *testing.T) {
+	got := runTestProg(t, "testprogcgo", "CgoEscapeWithMultiplePointers")
+	want := "OK\n"
+	if got != want {
+		t.Fatalf("output is %s; want %s", got, want)
+	}
+}
+
 func TestCgoTracebackGoroutineProfile(t *testing.T) {
 	output := runTestProg(t, "testprogcgo", "GoroutineProfile")
 	want := "OK\n"
@@ -856,3 +859,13 @@ func TestStackSwitchCallback(t *testing.T) {
 		t.Errorf("expected %q, got %v", want, got)
 	}
 }
+
+func TestCgoToGoCallGoexit(t *testing.T) {
+	if runtime.GOOS == "plan9" || runtime.GOOS == "windows" {
+		t.Skipf("no pthreads on %s", runtime.GOOS)
+	}
+	output := runTestProg(t, "testprogcgo", "CgoToGoCallGoexit")
+	if !strings.Contains(output, "runtime.Goexit called in a thread that was not created by the Go runtime") {
+		t.Fatalf("output should contain %s, got %s", "runtime.Goexit called in a thread that was not created by the Go runtime", output)
+	}
+}
diff --git a/src/runtime/crash_test.go b/src/runtime/crash_test.go
index 69e1034f..236c32ea 100644
--- a/src/runtime/crash_test.go
+++ b/src/runtime/crash_test.go
@@ -32,8 +32,11 @@ const entrypointVar = "RUNTIME_TEST_ENTRYPOINT"
 
 func TestMain(m *testing.M) {
 	switch entrypoint := os.Getenv(entrypointVar); entrypoint {
-	case "crash":
-		crash()
+	case "panic":
+		crashViaPanic()
+		panic("unreachable")
+	case "trap":
+		crashViaTrap()
 		panic("unreachable")
 	default:
 		log.Fatalf("invalid %s: %q", entrypointVar, entrypoint)
@@ -621,8 +624,11 @@ func TestConcurrentMapWrites(t *testing.T) {
 	}
 	testenv.MustHaveGoRun(t)
 	output := runTestProg(t, "testprog", "concurrentMapWrites")
-	want := "fatal error: concurrent map writes"
-	if !strings.HasPrefix(output, want) {
+	want := "fatal error: concurrent map writes\n"
+	// Concurrent writes can corrupt the map in a way that we
+	// detect with a separate throw.
+	want2 := "fatal error: small map with no empty slot (concurrent map writes?)\n"
+	if !strings.HasPrefix(output, want) && !strings.HasPrefix(output, want2) {
 		t.Fatalf("output does not start with %q:\n%s", want, output)
 	}
 }
@@ -632,8 +638,11 @@ func TestConcurrentMapReadWrite(t *testing.T) {
 	}
 	testenv.MustHaveGoRun(t)
 	output := runTestProg(t, "testprog", "concurrentMapReadWrite")
-	want := "fatal error: concurrent map read and map write"
-	if !strings.HasPrefix(output, want) {
+	want := "fatal error: concurrent map read and map write\n"
+	// Concurrent writes can corrupt the map in a way that we
+	// detect with a separate throw.
+	want2 := "fatal error: small map with no empty slot (concurrent map writes?)\n"
+	if !strings.HasPrefix(output, want) && !strings.HasPrefix(output, want2) {
 		t.Fatalf("output does not start with %q:\n%s", want, output)
 	}
 }
@@ -643,12 +652,42 @@ func TestConcurrentMapIterateWrite(t *testing.T) {
 	}
 	testenv.MustHaveGoRun(t)
 	output := runTestProg(t, "testprog", "concurrentMapIterateWrite")
-	want := "fatal error: concurrent map iteration and map write"
-	if !strings.HasPrefix(output, want) {
+	want := "fatal error: concurrent map iteration and map write\n"
+	// Concurrent writes can corrupt the map in a way that we
+	// detect with a separate throw.
+	want2 := "fatal error: small map with no empty slot (concurrent map writes?)\n"
+	if !strings.HasPrefix(output, want) && !strings.HasPrefix(output, want2) {
 		t.Fatalf("output does not start with %q:\n%s", want, output)
 	}
 }
 
+func TestConcurrentMapWritesIssue69447(t *testing.T) {
+	testenv.MustHaveGoRun(t)
+	exe, err := buildTestProg(t, "testprog")
+	if err != nil {
+		t.Fatal(err)
+	}
+	for i := 0; i < 200; i++ {
+		output := runBuiltTestProg(t, exe, "concurrentMapWrites")
+		if output == "" {
+			// If we didn't detect an error, that's ok.
+			// This case makes this test not flaky like
+			// the other ones above.
+			// (More correctly, this case makes this test flaky
+			// in the other direction, in that it might not
+			// detect a problem even if there is one.)
+			continue
+		}
+		want := "fatal error: concurrent map writes\n"
+		// Concurrent writes can corrupt the map in a way that we
+		// detect with a separate throw.
+		want2 := "fatal error: small map with no empty slot (concurrent map writes?)\n"
+		if !strings.HasPrefix(output, want) && !strings.HasPrefix(output, want2) {
+			t.Fatalf("output does not start with %q:\n%s", want, output)
+		}
+	}
+}
+
 type point struct {
 	x, y *int
 }
diff --git a/src/runtime/debug/mod.go b/src/runtime/debug/mod.go
index a4705605..53bbf1d8 100644
--- a/src/runtime/debug/mod.go
+++ b/src/runtime/debug/mod.go
@@ -101,6 +101,7 @@ func quoteValue(value string) bool {
 	return strings.ContainsAny(value, " \t\r\n\"`")
 }
 
+// String returns a string representation of a [BuildInfo].
 func (bi *BuildInfo) String() string {
 	buf := new(strings.Builder)
 	if bi.GoVersion != "" {
@@ -146,6 +147,12 @@ func (bi *BuildInfo) String() string {
 	return buf.String()
 }
 
+// ParseBuildInfo parses the string returned by [*BuildInfo.String],
+// restoring the original BuildInfo,
+// except that the GoVersion field is not set.
+// Programs should normally not call this function,
+// but instead call [ReadBuildInfo], [debug/buildinfo.ReadFile],
+// or [debug/buildinfo.Read].
 func ParseBuildInfo(data string) (bi *BuildInfo, err error) {
 	lineNum := 1
 	defer func() {
@@ -154,7 +161,7 @@ func ParseBuildInfo(data string) (bi *BuildInfo, err error) {
 		}
 	}()
 
-	var (
+	const (
 		pathLine  = "path\t"
 		modLine   = "mod\t"
 		depLine   = "dep\t"
@@ -195,7 +202,7 @@ func ParseBuildInfo(data string) (bi *BuildInfo, err error) {
 		switch {
 		case strings.HasPrefix(line, pathLine):
 			elem := line[len(pathLine):]
-			bi.Path = string(elem)
+			bi.Path = elem
 		case strings.HasPrefix(line, modLine):
 			elem := strings.Split(line[len(modLine):], tab)
 			last = &bi.Main
@@ -220,9 +227,9 @@ func ParseBuildInfo(data string) (bi *BuildInfo, err error) {
 				return nil, fmt.Errorf("replacement with no module on previous line")
 			}
 			last.Replace = &Module{
-				Path:    string(elem[0]),
-				Version: string(elem[1]),
-				Sum:     string(elem[2]),
+				Path:    elem[0],
+				Version: elem[1],
+				Sum:     elem[2],
 			}
 			last = nil
 		case strings.HasPrefix(line, buildLine):
diff --git a/src/runtime/debug/stack.go b/src/runtime/debug/stack.go
index d7a860b7..c4c3be14 100644
--- a/src/runtime/debug/stack.go
+++ b/src/runtime/debug/stack.go
@@ -52,7 +52,7 @@ func SetCrashOutput(f *os.File, opts CrashOptions) error {
 		// The runtime will write to this file descriptor from
 		// low-level routines during a panic, possibly without
 		// a G, so we must call f.Fd() eagerly. This creates a
-		// danger that that the file descriptor is no longer
+		// danger that the file descriptor is no longer
 		// valid at the time of the write, because the caller
 		// (incorrectly) called f.Close() and the kernel
 		// reissued the fd in a later call to open(2), leading
diff --git a/src/runtime/debug_test.go b/src/runtime/debug_test.go
index 1c00d2fb..37093cd8 100644
--- a/src/runtime/debug_test.go
+++ b/src/runtime/debug_test.go
@@ -9,13 +9,15 @@
 // spends all of its time in the race runtime, which isn't a safe
 // point.
 
-//go:build (amd64 || arm64 || ppc64le) && linux && !race
+//go:build (amd64 || arm64 || loong64 || ppc64le) && linux && !race
 
 package runtime_test
 
 import (
 	"fmt"
 	"internal/abi"
+	"internal/asan"
+	"internal/msan"
 	"math"
 	"os"
 	"regexp"
@@ -32,6 +34,14 @@ func startDebugCallWorker(t *testing.T) (g *runtime.G, after func()) {
 	// a debugger.
 	skipUnderDebugger(t)
 
+	// asan/msan instrumentation interferes with tests since we might
+	// inject debugCallV2 while in the asan/msan runtime. This is a
+	// problem for doing things like running the GC or taking stack
+	// traces. Not sure why this is happening yet, but skip for now.
+	if msan.Enabled || asan.Enabled {
+		t.Skip("debugCallV2 is injected erroneously during asan/msan runtime calls; skipping")
+	}
+
 	// This can deadlock if there aren't enough threads or if a GC
 	// tries to interrupt an atomic loop (see issue #10958). Execute
 	// an extra GC to ensure even the sweep phase is done (out of
diff --git a/src/runtime/debugcall.go b/src/runtime/debugcall.go
index fee4116a..e6554475 100644
--- a/src/runtime/debugcall.go
+++ b/src/runtime/debugcall.go
@@ -5,12 +5,13 @@
 // Though the debug call function feature is not enabled on
 // ppc64, inserted ppc64 to avoid missing Go declaration error
 // for debugCallPanicked while building runtime.test
-//go:build amd64 || arm64 || ppc64le || ppc64
+//go:build amd64 || arm64 || loong64 || ppc64le || ppc64
 
 package runtime
 
 import (
 	"internal/abi"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
@@ -34,7 +35,7 @@ func debugCallCheck(pc uintptr) string {
 	if getg() != getg().m.curg {
 		return debugCallSystemStack
 	}
-	if sp := getcallersp(); !(getg().stack.lo < sp && sp <= getg().stack.hi) {
+	if sp := sys.GetCallerSP(); !(getg().stack.lo < sp && sp <= getg().stack.hi) {
 		// Fast syscalls (nanotime) and racecall switch to the
 		// g0 stack without switching g. We can't safely make
 		// a call in this state. (We can't even safely
@@ -106,7 +107,7 @@ func debugCallCheck(pc uintptr) string {
 //go:nosplit
 func debugCallWrap(dispatch uintptr) {
 	var lockedExt uint32
-	callerpc := getcallerpc()
+	callerpc := sys.GetCallerPC()
 	gp := getg()
 
 	// Lock ourselves to the OS thread.
diff --git a/src/runtime/debuglog.go b/src/runtime/debuglog.go
index 695cd204..ad33ef8b 100644
--- a/src/runtime/debuglog.go
+++ b/src/runtime/debuglog.go
@@ -12,13 +12,23 @@
 //
 // This facility can be enabled by passing -tags debuglog when
 // building. Without this tag, dlog calls compile to nothing.
+//
+// Implementation notes
+//
+// There are two implementations of the dlog interface: dloggerImpl and
+// dloggerFake. dloggerFake is a no-op implementation. dlogger is type-aliased
+// to one or the other depending on the debuglog build tag. However, both types
+// always exist and are always built. This helps ensure we compile as much of
+// the implementation as possible in the default build configuration, while also
+// enabling us to achieve good test coverage of the real debuglog implementation
+// even when the debuglog build tag is not set.
 
 package runtime
 
 import (
 	"internal/abi"
 	"internal/runtime/atomic"
-	"runtime/internal/sys"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
@@ -48,11 +58,20 @@ const debugLogStringLimit = debugLogBytes / 8
 //
 //go:nosplit
 //go:nowritebarrierrec
-func dlog() *dlogger {
-	if !dlogEnabled {
-		return nil
-	}
+func dlog() dlogger {
+	// dlog1 is defined to either dlogImpl or dlogFake.
+	return dlog1()
+}
 
+//go:nosplit
+//go:nowritebarrierrec
+func dlogFake() dloggerFake {
+	return dloggerFake{}
+}
+
+//go:nosplit
+//go:nowritebarrierrec
+func dlogImpl() *dloggerImpl {
 	// Get the time.
 	tick, nano := uint64(cputicks()), uint64(nanotime())
 
@@ -63,7 +82,7 @@ func dlog() *dlogger {
 	// global pool.
 	if l == nil {
 		allp := (*uintptr)(unsafe.Pointer(&allDloggers))
-		all := (*dlogger)(unsafe.Pointer(atomic.Loaduintptr(allp)))
+		all := (*dloggerImpl)(unsafe.Pointer(atomic.Loaduintptr(allp)))
 		for l1 := all; l1 != nil; l1 = l1.allLink {
 			if l1.owned.Load() == 0 && l1.owned.CompareAndSwap(0, 1) {
 				l = l1
@@ -76,7 +95,7 @@ func dlog() *dlogger {
 	if l == nil {
 		// Use sysAllocOS instead of sysAlloc because we want to interfere
 		// with the runtime as little as possible, and sysAlloc updates accounting.
-		l = (*dlogger)(sysAllocOS(unsafe.Sizeof(dlogger{})))
+		l = (*dloggerImpl)(sysAllocOS(unsafe.Sizeof(dloggerImpl{})))
 		if l == nil {
 			throw("failed to allocate debug log")
 		}
@@ -87,7 +106,7 @@ func dlog() *dlogger {
 		headp := (*uintptr)(unsafe.Pointer(&allDloggers))
 		for {
 			head := atomic.Loaduintptr(headp)
-			l.allLink = (*dlogger)(unsafe.Pointer(head))
+			l.allLink = (*dloggerImpl)(unsafe.Pointer(head))
 			if atomic.Casuintptr(headp, head, uintptr(unsafe.Pointer(l))) {
 				break
 			}
@@ -119,16 +138,16 @@ func dlog() *dlogger {
 	return l
 }
 
-// A dlogger writes to the debug log.
+// A dloggerImpl writes to the debug log.
 //
-// To obtain a dlogger, call dlog(). When done with the dlogger, call
+// To obtain a dloggerImpl, call dlog(). When done with the dloggerImpl, call
 // end().
-type dlogger struct {
+type dloggerImpl struct {
 	_ sys.NotInHeap
 	w debugLogWriter
 
 	// allLink is the next dlogger in the allDloggers list.
-	allLink *dlogger
+	allLink *dloggerImpl
 
 	// owned indicates that this dlogger is owned by an M. This is
 	// accessed atomically.
@@ -138,14 +157,16 @@ type dlogger struct {
 // allDloggers is a list of all dloggers, linked through
 // dlogger.allLink. This is accessed atomically. This is prepend only,
 // so it doesn't need to protect against ABA races.
-var allDloggers *dlogger
+var allDloggers *dloggerImpl
+
+// A dloggerFake is a no-op implementation of dlogger.
+type dloggerFake struct{}
 
 //go:nosplit
-func (l *dlogger) end() {
-	if !dlogEnabled {
-		return
-	}
+func (l dloggerFake) end() {}
 
+//go:nosplit
+func (l *dloggerImpl) end() {
 	// Fill in framing header.
 	size := l.w.write - l.w.r.end
 	if !l.w.writeFrameAt(l.w.r.end, size) {
@@ -181,10 +202,10 @@ const (
 )
 
 //go:nosplit
-func (l *dlogger) b(x bool) *dlogger {
-	if !dlogEnabled {
-		return l
-	}
+func (l dloggerFake) b(x bool) dloggerFake { return l }
+
+//go:nosplit
+func (l *dloggerImpl) b(x bool) *dloggerImpl {
 	if x {
 		l.w.byte(debugLogBoolTrue)
 	} else {
@@ -194,85 +215,112 @@ func (l *dlogger) b(x bool) *dlogger {
 }
 
 //go:nosplit
-func (l *dlogger) i(x int) *dlogger {
+func (l dloggerFake) i(x int) dloggerFake { return l }
+
+//go:nosplit
+func (l *dloggerImpl) i(x int) *dloggerImpl {
 	return l.i64(int64(x))
 }
 
 //go:nosplit
-func (l *dlogger) i8(x int8) *dlogger {
+func (l dloggerFake) i8(x int8) dloggerFake { return l }
+
+//go:nosplit
+func (l *dloggerImpl) i8(x int8) *dloggerImpl {
 	return l.i64(int64(x))
 }
 
 //go:nosplit
-func (l *dlogger) i16(x int16) *dlogger {
+func (l dloggerFake) i16(x int16) dloggerFake { return l }
+
+//go:nosplit
+func (l *dloggerImpl) i16(x int16) *dloggerImpl {
 	return l.i64(int64(x))
 }
 
 //go:nosplit
-func (l *dlogger) i32(x int32) *dlogger {
+func (l dloggerFake) i32(x int32) dloggerFake { return l }
+
+//go:nosplit
+func (l *dloggerImpl) i32(x int32) *dloggerImpl {
 	return l.i64(int64(x))
 }
 
 //go:nosplit
-func (l *dlogger) i64(x int64) *dlogger {
-	if !dlogEnabled {
-		return l
-	}
+func (l dloggerFake) i64(x int64) dloggerFake { return l }
+
+//go:nosplit
+func (l *dloggerImpl) i64(x int64) *dloggerImpl {
 	l.w.byte(debugLogInt)
 	l.w.varint(x)
 	return l
 }
 
 //go:nosplit
-func (l *dlogger) u(x uint) *dlogger {
+func (l dloggerFake) u(x uint) dloggerFake { return l }
+
+//go:nosplit
+func (l *dloggerImpl) u(x uint) *dloggerImpl {
 	return l.u64(uint64(x))
 }
 
 //go:nosplit
-func (l *dlogger) uptr(x uintptr) *dlogger {
+func (l dloggerFake) uptr(x uintptr) dloggerFake { return l }
+
+//go:nosplit
+func (l *dloggerImpl) uptr(x uintptr) *dloggerImpl {
 	return l.u64(uint64(x))
 }
 
 //go:nosplit
-func (l *dlogger) u8(x uint8) *dlogger {
+func (l dloggerFake) u8(x uint8) dloggerFake { return l }
+
+//go:nosplit
+func (l *dloggerImpl) u8(x uint8) *dloggerImpl {
 	return l.u64(uint64(x))
 }
 
 //go:nosplit
-func (l *dlogger) u16(x uint16) *dlogger {
+func (l dloggerFake) u16(x uint16) dloggerFake { return l }
+
+//go:nosplit
+func (l *dloggerImpl) u16(x uint16) *dloggerImpl {
 	return l.u64(uint64(x))
 }
 
 //go:nosplit
-func (l *dlogger) u32(x uint32) *dlogger {
+func (l dloggerFake) u32(x uint32) dloggerFake { return l }
+
+//go:nosplit
+func (l *dloggerImpl) u32(x uint32) *dloggerImpl {
 	return l.u64(uint64(x))
 }
 
 //go:nosplit
-func (l *dlogger) u64(x uint64) *dlogger {
-	if !dlogEnabled {
-		return l
-	}
+func (l dloggerFake) u64(x uint64) dloggerFake { return l }
+
+//go:nosplit
+func (l *dloggerImpl) u64(x uint64) *dloggerImpl {
 	l.w.byte(debugLogUint)
 	l.w.uvarint(x)
 	return l
 }
 
 //go:nosplit
-func (l *dlogger) hex(x uint64) *dlogger {
-	if !dlogEnabled {
-		return l
-	}
+func (l dloggerFake) hex(x uint64) dloggerFake { return l }
+
+//go:nosplit
+func (l *dloggerImpl) hex(x uint64) *dloggerImpl {
 	l.w.byte(debugLogHex)
 	l.w.uvarint(x)
 	return l
 }
 
 //go:nosplit
-func (l *dlogger) p(x any) *dlogger {
-	if !dlogEnabled {
-		return l
-	}
+func (l dloggerFake) p(x any) dloggerFake { return l }
+
+//go:nosplit
+func (l *dloggerImpl) p(x any) *dloggerImpl {
 	l.w.byte(debugLogPtr)
 	if x == nil {
 		l.w.uvarint(0)
@@ -289,11 +337,10 @@ func (l *dlogger) p(x any) *dlogger {
 }
 
 //go:nosplit
-func (l *dlogger) s(x string) *dlogger {
-	if !dlogEnabled {
-		return l
-	}
+func (l dloggerFake) s(x string) dloggerFake { return l }
 
+//go:nosplit
+func (l *dloggerImpl) s(x string) *dloggerImpl {
 	strData := unsafe.StringData(x)
 	datap := &firstmoduledata
 	if len(x) > 4 && datap.etext <= uintptr(unsafe.Pointer(strData)) && uintptr(unsafe.Pointer(strData)) < datap.end {
@@ -325,20 +372,20 @@ func (l *dlogger) s(x string) *dlogger {
 }
 
 //go:nosplit
-func (l *dlogger) pc(x uintptr) *dlogger {
-	if !dlogEnabled {
-		return l
-	}
+func (l dloggerFake) pc(x uintptr) dloggerFake { return l }
+
+//go:nosplit
+func (l *dloggerImpl) pc(x uintptr) *dloggerImpl {
 	l.w.byte(debugLogPC)
 	l.w.uvarint(uint64(x))
 	return l
 }
 
 //go:nosplit
-func (l *dlogger) traceback(x []uintptr) *dlogger {
-	if !dlogEnabled {
-		return l
-	}
+func (l dloggerFake) traceback(x []uintptr) dloggerFake { return l }
+
+//go:nosplit
+func (l *dloggerImpl) traceback(x []uintptr) *dloggerImpl {
 	l.w.byte(debugLogTraceback)
 	l.w.uvarint(uint64(len(x)))
 	for _, pc := range x {
@@ -693,10 +740,12 @@ func (r *debugLogReader) printVal() bool {
 
 // printDebugLog prints the debug log.
 func printDebugLog() {
-	if !dlogEnabled {
-		return
+	if dlogEnabled {
+		printDebugLogImpl()
 	}
+}
 
+func printDebugLogImpl() {
 	// This function should not panic or throw since it is used in
 	// the fatal panic path and this may deadlock.
 
@@ -704,7 +753,7 @@ func printDebugLog() {
 
 	// Get the list of all debug logs.
 	allp := (*uintptr)(unsafe.Pointer(&allDloggers))
-	all := (*dlogger)(unsafe.Pointer(atomic.Loaduintptr(allp)))
+	all := (*dloggerImpl)(unsafe.Pointer(atomic.Loaduintptr(allp)))
 
 	// Count the logs.
 	n := 0
diff --git a/src/runtime/debuglog_off.go b/src/runtime/debuglog_off.go
index fa3be39c..4eb59fa6 100644
--- a/src/runtime/debuglog_off.go
+++ b/src/runtime/debuglog_off.go
@@ -8,12 +8,18 @@ package runtime
 
 const dlogEnabled = false
 
+type dlogger = dloggerFake
+
+func dlog1() dloggerFake {
+	return dlogFake()
+}
+
 type dlogPerM struct{}
 
-func getCachedDlogger() *dlogger {
+func getCachedDlogger() *dloggerImpl {
 	return nil
 }
 
-func putCachedDlogger(l *dlogger) bool {
+func putCachedDlogger(l *dloggerImpl) bool {
 	return false
 }
diff --git a/src/runtime/debuglog_on.go b/src/runtime/debuglog_on.go
index b8150202..99773129 100644
--- a/src/runtime/debuglog_on.go
+++ b/src/runtime/debuglog_on.go
@@ -8,21 +8,32 @@ package runtime
 
 const dlogEnabled = true
 
+// dlogger is the underlying implementation of the dlogger interface, selected
+// at build time.
+//
+// We use a type alias instead of struct embedding so that the dlogger type is
+// identical to the type returned by method chaining on the methods of this type.
+type dlogger = *dloggerImpl
+
+func dlog1() *dloggerImpl {
+	return dlogImpl()
+}
+
 // dlogPerM is the per-M debug log data. This is embedded in the m
 // struct.
 type dlogPerM struct {
-	dlogCache *dlogger
+	dlogCache *dloggerImpl
 }
 
 // getCachedDlogger returns a cached dlogger if it can do so
 // efficiently, or nil otherwise. The returned dlogger will be owned.
-func getCachedDlogger() *dlogger {
+func getCachedDlogger() *dloggerImpl {
 	mp := acquirem()
 	// We don't return a cached dlogger if we're running on the
 	// signal stack in case the signal arrived while in
 	// get/putCachedDlogger. (Too bad we don't have non-atomic
 	// exchange!)
-	var l *dlogger
+	var l *dloggerImpl
 	if getg() != mp.gsignal {
 		l = mp.dlogCache
 		mp.dlogCache = nil
@@ -33,7 +44,7 @@ func getCachedDlogger() *dlogger {
 
 // putCachedDlogger attempts to return l to the local cache. It
 // returns false if this fails.
-func putCachedDlogger(l *dlogger) bool {
+func putCachedDlogger(l *dloggerImpl) bool {
 	mp := acquirem()
 	if getg() != mp.gsignal && mp.dlogCache == nil {
 		mp.dlogCache = l
diff --git a/src/runtime/debuglog_test.go b/src/runtime/debuglog_test.go
index 18c54a81..d958c037 100644
--- a/src/runtime/debuglog_test.go
+++ b/src/runtime/debuglog_test.go
@@ -24,18 +24,16 @@ package runtime_test
 
 import (
 	"fmt"
-	"internal/testenv"
 	"regexp"
 	"runtime"
 	"strings"
 	"sync"
-	"sync/atomic"
 	"testing"
 )
 
 func skipDebugLog(t *testing.T) {
-	if !runtime.DlogEnabled {
-		t.Skip("debug log disabled (rebuild with -tags debuglog)")
+	if runtime.DlogEnabled {
+		t.Skip("debug log tests disabled to avoid collisions with real debug logs")
 	}
 }
 
@@ -83,28 +81,63 @@ func TestDebugLogSym(t *testing.T) {
 func TestDebugLogInterleaving(t *testing.T) {
 	skipDebugLog(t)
 	runtime.ResetDebugLog()
-	var wg sync.WaitGroup
-	done := int32(0)
-	wg.Add(1)
-	go func() {
-		// Encourage main goroutine to move around to
-		// different Ms and Ps.
-		for atomic.LoadInt32(&done) == 0 {
-			runtime.Gosched()
-		}
-		wg.Done()
-	}()
-	var want strings.Builder
-	for i := 0; i < 1000; i++ {
-		runtime.Dlog().I(i).End()
-		fmt.Fprintf(&want, "[] %d\n", i)
-		runtime.Gosched()
-	}
-	atomic.StoreInt32(&done, 1)
-	wg.Wait()
 
+	n1 := runtime.CountDebugLog()
+	t.Logf("number of log shards at start: %d", n1)
+
+	const limit = 1000
+	const concurrency = 10
+
+	// Start several goroutines writing to the log simultaneously.
+	var wg sync.WaitGroup
+	i := 0
+	chans := make([]chan bool, concurrency)
+	for gid := range concurrency {
+		chans[gid] = make(chan bool)
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			var log *runtime.Dlogger
+			for {
+				<-chans[gid]
+				if log != nil {
+					log.End()
+				}
+				next := chans[(gid+1)%len(chans)]
+				if i >= limit {
+					close(next)
+					break
+				}
+				// Log an entry, but *don't* release the log shard until its our
+				// turn again. This should result in at least n=concurrency log
+				// shards.
+				log = runtime.Dlog().I(i)
+				i++
+				// Wake up the next logger goroutine.
+				next <- true
+			}
+		}()
+	}
+	// Start the chain reaction.
+	chans[0] <- true
+
+	// Wait for them to finish and get the log.
+	wg.Wait()
 	gotFull := runtime.DumpDebugLog()
 	got := dlogCanonicalize(gotFull)
+
+	n2 := runtime.CountDebugLog()
+	t.Logf("number of log shards at end: %d", n2)
+	if n2 < concurrency {
+		t.Errorf("created %d log shards, expected >= %d", n2, concurrency)
+	}
+
+	// Construct the desired output.
+	var want strings.Builder
+	for i := 0; i < limit; i++ {
+		fmt.Fprintf(&want, "[] %d\n", i)
+	}
+
 	if got != want.String() {
 		// Since the timestamps are useful in understand
 		// failures of this test, we print the uncanonicalized
@@ -156,14 +189,3 @@ func TestDebugLogLongString(t *testing.T) {
 		t.Fatalf("want %q, got %q", want, got)
 	}
 }
-
-// TestDebugLogBuild verifies that the runtime builds with -tags=debuglog.
-func TestDebugLogBuild(t *testing.T) {
-	testenv.MustHaveGoBuild(t)
-
-	// It doesn't matter which program we build, anything will rebuild the
-	// runtime.
-	if _, err := buildTestProg(t, "testprog", "-tags=debuglog"); err != nil {
-		t.Fatal(err)
-	}
-}
diff --git a/src/runtime/defer_test.go b/src/runtime/defer_test.go
index d73202ae..e3d0d077 100644
--- a/src/runtime/defer_test.go
+++ b/src/runtime/defer_test.go
@@ -5,8 +5,8 @@
 package runtime_test
 
 import (
-	"reflect"
 	"runtime"
+	"slices"
 	"testing"
 )
 
@@ -83,7 +83,7 @@ func TestConditionalDefers(t *testing.T) {
 			t.Fatal("expected panic")
 		}
 		want := []int{4, 2, 1}
-		if !reflect.DeepEqual(want, list) {
+		if !slices.Equal(want, list) {
 			t.Fatalf("wanted %v, got %v", want, list)
 		}
 
diff --git a/src/runtime/defs_linux_loong64.go b/src/runtime/defs_linux_loong64.go
index 692d8c78..b9837251 100644
--- a/src/runtime/defs_linux_loong64.go
+++ b/src/runtime/defs_linux_loong64.go
@@ -184,6 +184,7 @@ type sigcontext struct {
 	sc_pc         uint64
 	sc_regs       [32]uint64
 	sc_flags      uint32
+	sc_pad0       [1]uint32
 	sc_extcontext [0]uint64
 }
 
diff --git a/src/runtime/error.go b/src/runtime/error.go
index 406f36ca..9017c043 100644
--- a/src/runtime/error.go
+++ b/src/runtime/error.go
@@ -7,6 +7,7 @@ package runtime
 import (
 	"internal/abi"
 	"internal/bytealg"
+	"internal/runtime/sys"
 )
 
 // The Error interface identifies a run time error.
@@ -329,7 +330,7 @@ func printindented(s string) {
 //
 // It is called from the generated wrapper code.
 func panicwrap() {
-	pc := getcallerpc()
+	pc := sys.GetCallerPC()
 	name := funcNameForPrint(funcname(findfunc(pc)))
 	// name is something like "main.(*T).F".
 	// We want to extract pkg ("main"), typ ("T"), and meth ("F").
diff --git a/src/runtime/example_test.go b/src/runtime/example_test.go
index dcb8f779..eae9dbd7 100644
--- a/src/runtime/example_test.go
+++ b/src/runtime/example_test.go
@@ -32,15 +32,14 @@ func ExampleFrames() {
 		for {
 			frame, more := frames.Next()
 
-			// Process this frame.
-			//
-			// To keep this example's output stable
-			// even if there are changes in the testing package,
-			// stop unwinding when we leave package runtime.
-			if !strings.Contains(frame.File, "runtime/") {
+			// Canonicalize function name and skip callers of this function
+			// for predictable example output.
+			// You probably don't need this in your own code.
+			function := strings.ReplaceAll(frame.Function, "main.main", "runtime_test.ExampleFrames")
+			fmt.Printf("- more:%v | %s\n", more, function)
+			if function == "runtime_test.ExampleFrames" {
 				break
 			}
-			fmt.Printf("- more:%v | %s\n", more, frame.Function)
 
 			// Check whether there are more frames to process after this one.
 			if !more {
diff --git a/src/runtime/export_debug_loong64_test.go b/src/runtime/export_debug_loong64_test.go
new file mode 100644
index 00000000..eaaf3598
--- /dev/null
+++ b/src/runtime/export_debug_loong64_test.go
@@ -0,0 +1,227 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build loong64 && linux
+
+package runtime
+
+import (
+	"internal/abi"
+	"internal/goarch"
+	"unsafe"
+)
+
+type sigContext struct {
+	savedRegs sigcontext
+}
+
+func sigctxtSetContextRegister(ctxt *sigctxt, x uint64) {
+	ctxt.regs().sc_regs[29] = x
+}
+
+func sigctxtAtTrapInstruction(ctxt *sigctxt) bool {
+	return *(*uint32)(unsafe.Pointer(ctxt.sigpc())) == 0x002a0000 // BREAK 0
+}
+
+func sigctxtStatus(ctxt *sigctxt) uint64 {
+	return ctxt.r19()
+}
+
+func (h *debugCallHandler) saveSigContext(ctxt *sigctxt) {
+	sp := ctxt.sp()
+	sp -= goarch.PtrSize
+	ctxt.set_sp(sp)
+	*(*uint64)(unsafe.Pointer(uintptr(sp))) = ctxt.link() // save the current lr
+	ctxt.set_link(ctxt.pc())                              // set new lr to the current pc
+	// Write the argument frame size.
+	*(*uintptr)(unsafe.Pointer(uintptr(sp - 8))) = h.argSize
+	// Save current registers.
+	h.sigCtxt.savedRegs = *ctxt.regs()
+}
+
+// case 0
+func (h *debugCallHandler) debugCallRun(ctxt *sigctxt) {
+	sp := ctxt.sp()
+	memmove(unsafe.Pointer(uintptr(sp)+8), h.argp, h.argSize)
+	if h.regArgs != nil {
+		storeRegArgs(ctxt.regs(), h.regArgs)
+	}
+	// Push return PC, which should be the signal PC+4, because
+	// the signal PC is the PC of the trap instruction itself.
+	ctxt.set_link(ctxt.pc() + 4)
+	// Set PC to call and context register.
+	ctxt.set_pc(uint64(h.fv.fn))
+	sigctxtSetContextRegister(ctxt, uint64(uintptr(unsafe.Pointer(h.fv))))
+}
+
+// case 1
+func (h *debugCallHandler) debugCallReturn(ctxt *sigctxt) {
+	sp := ctxt.sp()
+	memmove(h.argp, unsafe.Pointer(uintptr(sp)+8), h.argSize)
+	if h.regArgs != nil {
+		loadRegArgs(h.regArgs, ctxt.regs())
+	}
+	// Restore the old lr from *sp
+	olr := *(*uint64)(unsafe.Pointer(uintptr(sp)))
+	ctxt.set_link(olr)
+	pc := ctxt.pc()
+	ctxt.set_pc(pc + 4) // step to next instruction
+}
+
+// case 2
+func (h *debugCallHandler) debugCallPanicOut(ctxt *sigctxt) {
+	sp := ctxt.sp()
+	memmove(unsafe.Pointer(&h.panic), unsafe.Pointer(uintptr(sp)+8), 2*goarch.PtrSize)
+	ctxt.set_pc(ctxt.pc() + 4)
+}
+
+// case 8
+func (h *debugCallHandler) debugCallUnsafe(ctxt *sigctxt) {
+	sp := ctxt.sp()
+	reason := *(*string)(unsafe.Pointer(uintptr(sp) + 8))
+	h.err = plainError(reason)
+	ctxt.set_pc(ctxt.pc() + 4)
+}
+
+// case 16
+func (h *debugCallHandler) restoreSigContext(ctxt *sigctxt) {
+	// Restore all registers except for pc and sp
+	pc, sp := ctxt.pc(), ctxt.sp()
+	*ctxt.regs() = h.sigCtxt.savedRegs
+	ctxt.set_pc(pc + 4)
+	ctxt.set_sp(sp)
+}
+
+func getVal32(base uintptr, off uintptr) uint32 {
+	return *(*uint32)(unsafe.Pointer(base + off))
+}
+
+func getVal64(base uintptr, off uintptr) uint64 {
+	return *(*uint64)(unsafe.Pointer(base + off))
+}
+
+func setVal64(base uintptr, off uintptr, val uint64) {
+	*(*uint64)(unsafe.Pointer(base + off)) = val
+}
+
+// Layout for sigcontext on linux/loong64: arch/loongarch/include/uapi/asm/sigcontext.h
+//
+//  sc_extcontext |  sctx_info
+// ------------------------------------------
+//                |  {fpu,lsx,lasx}_context
+//                ---------------------------
+//                |  sctx_info
+//                ---------------------------
+//                |  lbt_context
+//
+
+const (
+	INVALID_MAGIC  uint32 = 0
+	FPU_CTX_MAGIC         = 0x46505501
+	LSX_CTX_MAGIC         = 0x53580001
+	LASX_CTX_MAGIC        = 0x41535801
+	LBT_CTX_MAGIC         = 0x42540001
+)
+
+const (
+	SCTX_INFO_SIZE = 4 + 4 + 8
+	FPU_CTX_SIZE   = 8*32 + 8 + 4  // fpu context size
+	LSX_CTX_SIZE   = 8*64 + 8 + 4  // lsx context size
+	LASX_CTX_SIZE  = 8*128 + 8 + 4 // lasx context size
+	LBT_CTX_SIZE   = 8*4 + 4 + 4   // lbt context size
+)
+
+// storeRegArgs sets up argument registers in the signal context state
+// from an abi.RegArgs.
+//
+// Both src and dst must be non-nil.
+func storeRegArgs(dst *sigcontext, src *abi.RegArgs) {
+	// R4..R19 are used to pass int arguments in registers on loong64
+	for i := 0; i < abi.IntArgRegs; i++ {
+		dst.sc_regs[i+4] = (uint64)(src.Ints[i])
+	}
+
+	// F0..F15 are used to pass float arguments in registers on loong64
+	offset := (uintptr)(0)
+	baseAddr := (uintptr)(unsafe.Pointer(&dst.sc_extcontext))
+
+	for {
+		magic := getVal32(baseAddr, offset)
+		size := getVal32(baseAddr, offset+4)
+
+		switch magic {
+		case INVALID_MAGIC:
+			return
+
+		case FPU_CTX_MAGIC:
+			offset += SCTX_INFO_SIZE
+			for i := 0; i < abi.FloatArgRegs; i++ {
+				setVal64(baseAddr, ((uintptr)(i*8) + offset), src.Floats[i])
+			}
+			return
+
+		case LSX_CTX_MAGIC:
+			offset += SCTX_INFO_SIZE
+			for i := 0; i < abi.FloatArgRegs; i++ {
+				setVal64(baseAddr, ((uintptr)(i*16) + offset), src.Floats[i])
+			}
+			return
+
+		case LASX_CTX_MAGIC:
+			offset += SCTX_INFO_SIZE
+			for i := 0; i < abi.FloatArgRegs; i++ {
+				setVal64(baseAddr, ((uintptr)(i*32) + offset), src.Floats[i])
+			}
+			return
+
+		case LBT_CTX_MAGIC:
+			offset += uintptr(size)
+		}
+	}
+}
+
+func loadRegArgs(dst *abi.RegArgs, src *sigcontext) {
+	// R4..R19 are used to pass int arguments in registers on loong64
+	for i := 0; i < abi.IntArgRegs; i++ {
+		dst.Ints[i] = uintptr(src.sc_regs[i+4])
+	}
+
+	// F0..F15 are used to pass float arguments in registers on loong64
+	offset := (uintptr)(0)
+	baseAddr := (uintptr)(unsafe.Pointer(&src.sc_extcontext))
+
+	for {
+		magic := getVal32(baseAddr, offset)
+		size := getVal32(baseAddr, (offset + 4))
+
+		switch magic {
+		case INVALID_MAGIC:
+			return
+
+		case FPU_CTX_MAGIC:
+			offset += SCTX_INFO_SIZE
+			for i := 0; i < abi.FloatArgRegs; i++ {
+				dst.Floats[i] = getVal64(baseAddr, (uintptr(i*8) + offset))
+			}
+			return
+
+		case LSX_CTX_MAGIC:
+			offset += SCTX_INFO_SIZE
+			for i := 0; i < abi.FloatArgRegs; i++ {
+				dst.Floats[i] = getVal64(baseAddr, (uintptr(i*16) + offset))
+			}
+			return
+
+		case LASX_CTX_MAGIC:
+			offset += SCTX_INFO_SIZE
+			for i := 0; i < abi.FloatArgRegs; i++ {
+				dst.Floats[i] = getVal64(baseAddr, (uintptr(i*32) + offset))
+			}
+			return
+
+		case LBT_CTX_MAGIC:
+			offset += uintptr(size)
+		}
+	}
+}
diff --git a/src/runtime/export_debug_test.go b/src/runtime/export_debug_test.go
index 4e0a4ef9..96f6fd9e 100644
--- a/src/runtime/export_debug_test.go
+++ b/src/runtime/export_debug_test.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build (amd64 || arm64 || ppc64le) && linux
+//go:build (amd64 || arm64 || loong64 || ppc64le) && linux
 
 package runtime
 
diff --git a/src/runtime/export_debuglog_test.go b/src/runtime/export_debuglog_test.go
index 04ac79f3..c370a793 100644
--- a/src/runtime/export_debuglog_test.go
+++ b/src/runtime/export_debuglog_test.go
@@ -12,22 +12,26 @@ const DebugLogBytes = debugLogBytes
 
 const DebugLogStringLimit = debugLogStringLimit
 
-var Dlog = dlog
+type Dlogger = dloggerImpl
 
-func (l *dlogger) End()                  { l.end() }
-func (l *dlogger) B(x bool) *dlogger     { return l.b(x) }
-func (l *dlogger) I(x int) *dlogger      { return l.i(x) }
-func (l *dlogger) I16(x int16) *dlogger  { return l.i16(x) }
-func (l *dlogger) U64(x uint64) *dlogger { return l.u64(x) }
-func (l *dlogger) Hex(x uint64) *dlogger { return l.hex(x) }
-func (l *dlogger) P(x any) *dlogger      { return l.p(x) }
-func (l *dlogger) S(x string) *dlogger   { return l.s(x) }
-func (l *dlogger) PC(x uintptr) *dlogger { return l.pc(x) }
+func Dlog() *Dlogger {
+	return dlogImpl()
+}
+
+func (l *dloggerImpl) End()                      { l.end() }
+func (l *dloggerImpl) B(x bool) *dloggerImpl     { return l.b(x) }
+func (l *dloggerImpl) I(x int) *dloggerImpl      { return l.i(x) }
+func (l *dloggerImpl) I16(x int16) *dloggerImpl  { return l.i16(x) }
+func (l *dloggerImpl) U64(x uint64) *dloggerImpl { return l.u64(x) }
+func (l *dloggerImpl) Hex(x uint64) *dloggerImpl { return l.hex(x) }
+func (l *dloggerImpl) P(x any) *dloggerImpl      { return l.p(x) }
+func (l *dloggerImpl) S(x string) *dloggerImpl   { return l.s(x) }
+func (l *dloggerImpl) PC(x uintptr) *dloggerImpl { return l.pc(x) }
 
 func DumpDebugLog() string {
 	gp := getg()
 	gp.writebuf = make([]byte, 0, 1<<20)
-	printDebugLog()
+	printDebugLogImpl()
 	buf := gp.writebuf
 	gp.writebuf = nil
 
@@ -44,3 +48,13 @@ func ResetDebugLog() {
 	}
 	startTheWorld(stw)
 }
+
+func CountDebugLog() int {
+	stw := stopTheWorld(stwForTestResetDebugLog)
+	i := 0
+	for l := allDloggers; l != nil; l = l.allLink {
+		i++
+	}
+	startTheWorld(stw)
+	return i
+}
diff --git a/src/runtime/export_map_noswiss_test.go b/src/runtime/export_map_noswiss_test.go
new file mode 100644
index 00000000..4638afa6
--- /dev/null
+++ b/src/runtime/export_map_noswiss_test.go
@@ -0,0 +1,64 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build !goexperiment.swissmap
+
+package runtime
+
+import (
+	"internal/abi"
+	"unsafe"
+)
+
+const RuntimeHmapSize = unsafe.Sizeof(hmap{})
+
+func OverLoadFactor(count int, B uint8) bool {
+	return overLoadFactor(count, B)
+}
+
+func MapBucketsCount(m map[int]int) int {
+	h := *(**hmap)(unsafe.Pointer(&m))
+	return 1 << h.B
+}
+
+func MapBucketsPointerIsNil(m map[int]int) bool {
+	h := *(**hmap)(unsafe.Pointer(&m))
+	return h.buckets == nil
+}
+
+func MapTombstoneCheck(m map[int]int) {
+	// Make sure emptyOne and emptyRest are distributed correctly.
+	// We should have a series of filled and emptyOne cells, followed by
+	// a series of emptyRest cells.
+	h := *(**hmap)(unsafe.Pointer(&m))
+	i := any(m)
+	t := *(**maptype)(unsafe.Pointer(&i))
+
+	for x := 0; x < 1<= n && b.tophash[i] != emptyRest {
+					panic("late non-emptyRest")
+				}
+				if k == n-1 && b.tophash[i] == emptyOne {
+					panic("last non-emptyRest entry is emptyOne")
+				}
+				k++
+			}
+		}
+	}
+}
diff --git a/src/runtime/export_map_swiss_test.go b/src/runtime/export_map_swiss_test.go
new file mode 100644
index 00000000..55a7d6ff
--- /dev/null
+++ b/src/runtime/export_map_swiss_test.go
@@ -0,0 +1,11 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build goexperiment.swissmap
+
+package runtime
+
+func MapTombstoneCheck(m map[int]int) {
+	// TODO
+}
diff --git a/src/runtime/export_test.go b/src/runtime/export_test.go
index 4502fa72..79d83b3a 100644
--- a/src/runtime/export_test.go
+++ b/src/runtime/export_test.go
@@ -11,7 +11,7 @@ import (
 	"internal/goarch"
 	"internal/goos"
 	"internal/runtime/atomic"
-	"runtime/internal/sys"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
@@ -94,9 +94,9 @@ func Netpoll(delta int64) {
 	})
 }
 
-func GCMask(x any) (ret []byte) {
+func PointerMask(x any) (ret []byte) {
 	systemstack(func() {
-		ret = getgcmask(x)
+		ret = pointerMask(x)
 	})
 	return
 }
@@ -481,22 +481,6 @@ func (rw *RWMutex) Unlock() {
 	rw.rw.unlock()
 }
 
-const RuntimeHmapSize = unsafe.Sizeof(hmap{})
-
-func MapBucketsCount(m map[int]int) int {
-	h := *(**hmap)(unsafe.Pointer(&m))
-	return 1 << h.B
-}
-
-func MapBucketsPointerIsNil(m map[int]int) bool {
-	h := *(**hmap)(unsafe.Pointer(&m))
-	return h.buckets == nil
-}
-
-func OverLoadFactor(count int, B uint8) bool {
-	return overLoadFactor(count, B)
-}
-
 func LockOSCounts() (external, internal uint32) {
 	gp := getg()
 	if gp.m.lockedExt+gp.m.lockedInt == 0 {
@@ -514,7 +498,7 @@ func LockOSCounts() (external, internal uint32) {
 //go:noinline
 func TracebackSystemstack(stk []uintptr, i int) int {
 	if i == 0 {
-		pc, sp := getcallerpc(), getcallersp()
+		pc, sp := sys.GetCallerPC(), sys.GetCallerSP()
 		var u unwinder
 		u.initAt(pc, sp, 0, getg(), unwindJumpStack) // Don't ignore errors, for testing
 		return tracebackPCs(&u, 0, stk)
@@ -597,7 +581,7 @@ func unexportedPanicForTesting(b []byte, i int) byte {
 func G0StackOverflow() {
 	systemstack(func() {
 		g0 := getg()
-		sp := getcallersp()
+		sp := sys.GetCallerSP()
 		// The stack bounds for g0 stack is not always precise.
 		// Use an artificially small stack, to trigger a stack overflow
 		// without actually run out of the system stack (which may seg fault).
@@ -614,42 +598,6 @@ func stackOverflow(x *byte) {
 	stackOverflow(&buf[0])
 }
 
-func MapTombstoneCheck(m map[int]int) {
-	// Make sure emptyOne and emptyRest are distributed correctly.
-	// We should have a series of filled and emptyOne cells, followed by
-	// a series of emptyRest cells.
-	h := *(**hmap)(unsafe.Pointer(&m))
-	i := any(m)
-	t := *(**maptype)(unsafe.Pointer(&i))
-
-	for x := 0; x < 1<= n && b.tophash[i] != emptyRest {
-					panic("late non-emptyRest")
-				}
-				if k == n-1 && b.tophash[i] == emptyOne {
-					panic("last non-emptyRest entry is emptyOne")
-				}
-				k++
-			}
-		}
-	}
-}
-
 func RunGetgThreadSwitchTest() {
 	// Test that getg works correctly with thread switch.
 	// With gccgo, if we generate getg inlined, the backend
@@ -1223,6 +1171,9 @@ func PageCachePagesLeaked() (leaked uintptr) {
 	return
 }
 
+var ProcYield = procyield
+var OSYield = osyield
+
 type Mutex = mutex
 
 var Lock = lock
@@ -1313,7 +1264,7 @@ const (
 
 type TimeHistogram timeHistogram
 
-// Counts returns the counts for the given bucket, subBucket indices.
+// Count returns the counts for the given bucket, subBucket indices.
 // Returns true if the bucket was valid, otherwise returns the counts
 // for the overflow bucket if bucket > 0 or the underflow bucket if
 // bucket < 0, and false.
@@ -1913,3 +1864,18 @@ func GCMarkDoneResetRestartFlag() {
 	gcDebugMarkDone.restartedDueTo27993 = false
 	releasem(mp)
 }
+
+type BitCursor struct {
+	b bitCursor
+}
+
+func NewBitCursor(buf *byte) BitCursor {
+	return BitCursor{b: bitCursor{ptr: buf, n: 0}}
+}
+
+func (b BitCursor) Write(data *byte, cnt uintptr) {
+	b.b.write(data, cnt)
+}
+func (b BitCursor) Offset(cnt uintptr) BitCursor {
+	return BitCursor{b: b.b.offset(cnt)}
+}
diff --git a/src/runtime/export_windows_test.go b/src/runtime/export_windows_test.go
index 8bfff0bc..5ff52292 100644
--- a/src/runtime/export_windows_test.go
+++ b/src/runtime/export_windows_test.go
@@ -6,7 +6,10 @@
 
 package runtime
 
-import "unsafe"
+import (
+	"internal/runtime/sys"
+	"unsafe"
+)
 
 const MaxArgs = maxArgs
 
@@ -31,8 +34,8 @@ func (c ContextStub) GetPC() uintptr {
 
 func NewContextStub() *ContextStub {
 	var ctx context
-	ctx.set_ip(getcallerpc())
-	ctx.set_sp(getcallersp())
+	ctx.set_ip(sys.GetCallerPC())
+	ctx.set_sp(sys.GetCallerSP())
 	ctx.set_fp(getcallerfp())
 	return &ContextStub{ctx}
 }
diff --git a/src/runtime/extern.go b/src/runtime/extern.go
index 2019be4d..fad19b94 100644
--- a/src/runtime/extern.go
+++ b/src/runtime/extern.go
@@ -294,10 +294,11 @@ import (
 
 // Caller reports file and line number information about function invocations on
 // the calling goroutine's stack. The argument skip is the number of stack frames
-// to ascend, with 0 identifying the caller of Caller.  (For historical reasons the
-// meaning of skip differs between Caller and [Callers].) The return values report the
-// program counter, file name, and line number within the file of the corresponding
-// call. The boolean ok is false if it was not possible to recover the information.
+// to ascend, with 0 identifying the caller of Caller. (For historical reasons the
+// meaning of skip differs between Caller and [Callers].) The return values report
+// the program counter, the file name (using forward slashes as path separator, even
+// on Windows), and the line number within the file of the corresponding call.
+// The boolean ok is false if it was not possible to recover the information.
 func Caller(skip int) (pc uintptr, file string, line int, ok bool) {
 	rpc := make([]uintptr, 1)
 	n := callers(skip+1, rpc)
@@ -336,6 +337,11 @@ var defaultGOROOT string // set by cmd/link
 // GOROOT returns the root of the Go tree. It uses the
 // GOROOT environment variable, if set at process start,
 // or else the root used during the Go build.
+//
+// Deprecated: The root used during the Go build will not be
+// meaningful if the binary is copied to another machine.
+// Use the system path to locate the “go” binary, and use
+// “go env GOROOT” to find its GOROOT.
 func GOROOT() string {
 	s := gogetenv("GOROOT")
 	if s != "" {
diff --git a/src/runtime/gc_test.go b/src/runtime/gc_test.go
index 4b92b200..00280ed1 100644
--- a/src/runtime/gc_test.go
+++ b/src/runtime/gc_test.go
@@ -6,8 +6,8 @@ package runtime_test
 
 import (
 	"fmt"
+	"internal/asan"
 	"internal/testenv"
-	"internal/weak"
 	"math/bits"
 	"math/rand"
 	"os"
@@ -21,6 +21,7 @@ import (
 	"testing"
 	"time"
 	"unsafe"
+	"weak"
 )
 
 func TestGcSys(t *testing.T) {
@@ -210,6 +211,9 @@ func TestGcZombieReporting(t *testing.T) {
 }
 
 func TestGCTestMoveStackOnNextCall(t *testing.T) {
+	if asan.Enabled {
+		t.Skip("extra allocations with -asan causes this to fail; see #70079")
+	}
 	t.Parallel()
 	var onStack int
 	// GCTestMoveStackOnNextCall can fail in rare cases if there's
@@ -300,6 +304,9 @@ var pointerClassBSS *int
 var pointerClassData = 42
 
 func TestGCTestPointerClass(t *testing.T) {
+	if asan.Enabled {
+		t.Skip("extra allocations cause this test to fail; see #70079")
+	}
 	t.Parallel()
 	check := func(p unsafe.Pointer, want string) {
 		t.Helper()
@@ -736,7 +743,7 @@ func BenchmarkMSpanCountAlloc(b *testing.B) {
 	// always rounded up 8 bytes.
 	for _, n := range []int{8, 16, 32, 64, 128} {
 		b.Run(fmt.Sprintf("bits=%d", n*8), func(b *testing.B) {
-			// Initialize a new byte slice with pseduo-random data.
+			// Initialize a new byte slice with pseudo-random data.
 			bits := make([]byte, n)
 			rand.Read(bits)
 
@@ -819,7 +826,7 @@ func TestWeakToStrongMarkTermination(t *testing.T) {
 
 	// Start a GC, and wait a little bit to get something spinning in mark termination.
 	// Simultaneously, fire off another goroutine to disable spinning. If everything's
-	// working correctly, then weak.Strong will block, so we need to make sure something
+	// working correctly, then weak.Value will block, so we need to make sure something
 	// prevents the GC from continuing to spin.
 	done := make(chan struct{})
 	go func() {
@@ -827,7 +834,11 @@ func TestWeakToStrongMarkTermination(t *testing.T) {
 		done <- struct{}{}
 	}()
 	go func() {
-		time.Sleep(100 * time.Millisecond)
+		// Usleep here instead of time.Sleep. time.Sleep
+		// can allocate, and if we get unlucky, then it
+		// can end up stuck in gcMarkDone with nothing to
+		// wake it.
+		runtime.Usleep(100000) // 100ms
 
 		// Let mark termination continue.
 		runtime.SetSpinInGCMarkDone(false)
@@ -840,7 +851,7 @@ func TestWeakToStrongMarkTermination(t *testing.T) {
 		wg.Add(1)
 		go func() {
 			defer wg.Done()
-			wp.Strong()
+			wp.Value()
 		}()
 	}
 
diff --git a/src/runtime/gcinfo_test.go b/src/runtime/gcinfo_test.go
index 5f72caf0..02457f68 100644
--- a/src/runtime/gcinfo_test.go
+++ b/src/runtime/gcinfo_test.go
@@ -90,7 +90,7 @@ func TestGCInfo(t *testing.T) {
 }
 
 func verifyGCInfo(t *testing.T, name string, p any, mask0 []byte) {
-	mask := runtime.GCMask(p)
+	mask := runtime.PointerMask(p)
 	if bytes.HasPrefix(mask, mask0) {
 		// Just the prefix matching is OK.
 		//
diff --git a/src/runtime/hash64.go b/src/runtime/hash64.go
index 05cdb811..124bb7d7 100644
--- a/src/runtime/hash64.go
+++ b/src/runtime/hash64.go
@@ -10,7 +10,7 @@
 package runtime
 
 import (
-	"runtime/internal/math"
+	"internal/runtime/math"
 	"unsafe"
 )
 
diff --git a/src/runtime/heapdump.go b/src/runtime/heapdump.go
index 95fb62dc..8f2ae34f 100644
--- a/src/runtime/heapdump.go
+++ b/src/runtime/heapdump.go
@@ -205,7 +205,7 @@ func dumptype(t *_type) {
 		dwritebyte('.')
 		dwrite(unsafe.Pointer(unsafe.StringData(name)), uintptr(len(name)))
 	}
-	dumpbool(t.Kind_&abi.KindDirectIface == 0 || t.PtrBytes != 0)
+	dumpbool(t.Kind_&abi.KindDirectIface == 0 || t.Pointers())
 }
 
 // dump an object.
diff --git a/src/runtime/histogram.go b/src/runtime/histogram.go
index 95230d1f..920a9561 100644
--- a/src/runtime/histogram.go
+++ b/src/runtime/histogram.go
@@ -6,7 +6,7 @@ package runtime
 
 import (
 	"internal/runtime/atomic"
-	"runtime/internal/sys"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
diff --git a/src/runtime/iface.go b/src/runtime/iface.go
index 41a10ae0..99866864 100644
--- a/src/runtime/iface.go
+++ b/src/runtime/iface.go
@@ -8,7 +8,7 @@ import (
 	"internal/abi"
 	"internal/goarch"
 	"internal/runtime/atomic"
-	"runtime/internal/sys"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
@@ -333,7 +333,7 @@ var (
 // be used as the second word of an interface value.
 func convT(t *_type, v unsafe.Pointer) unsafe.Pointer {
 	if raceenabled {
-		raceReadObjectPC(t, v, getcallerpc(), abi.FuncPCABIInternal(convT))
+		raceReadObjectPC(t, v, sys.GetCallerPC(), abi.FuncPCABIInternal(convT))
 	}
 	if msanenabled {
 		msanread(v, t.Size_)
@@ -348,7 +348,7 @@ func convT(t *_type, v unsafe.Pointer) unsafe.Pointer {
 func convTnoptr(t *_type, v unsafe.Pointer) unsafe.Pointer {
 	// TODO: maybe take size instead of type?
 	if raceenabled {
-		raceReadObjectPC(t, v, getcallerpc(), abi.FuncPCABIInternal(convTnoptr))
+		raceReadObjectPC(t, v, sys.GetCallerPC(), abi.FuncPCABIInternal(convTnoptr))
 	}
 	if msanenabled {
 		msanread(v, t.Size_)
@@ -692,39 +692,16 @@ func iterate_itabs(fn func(*itab)) {
 }
 
 // staticuint64s is used to avoid allocating in convTx for small integer values.
-var staticuint64s = [...]uint64{
-	0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
-	0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
-	0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
-	0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
-	0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
-	0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
-	0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
-	0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
-	0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
-	0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
-	0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
-	0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
-	0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
-	0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
-	0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
-	0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f,
-	0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
-	0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
-	0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
-	0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
-	0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
-	0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf,
-	0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7,
-	0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf,
-	0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7,
-	0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf,
-	0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7,
-	0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf,
-	0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
-	0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,
-	0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
-	0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff,
+// staticuint64s[0] == 0, staticuint64s[1] == 1, and so forth.
+// It is defined in assembler code so that it is read-only.
+var staticuint64s [256]uint64
+
+// getStaticuint64s is called by the reflect package to get a pointer
+// to the read-only array.
+//
+//go:linkname getStaticuint64s
+func getStaticuint64s() *[256]uint64 {
+	return &staticuint64s
 }
 
 // The linker redirects a reference of a method that it determined
diff --git a/src/runtime/ints.s b/src/runtime/ints.s
new file mode 100644
index 00000000..b816a2fb
--- /dev/null
+++ b/src/runtime/ints.s
@@ -0,0 +1,264 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "textflag.h"
+
+DATA ·staticuint64s+0x000(SB)/8, $0
+DATA ·staticuint64s+0x008(SB)/8, $1
+DATA ·staticuint64s+0x010(SB)/8, $2
+DATA ·staticuint64s+0x018(SB)/8, $3
+DATA ·staticuint64s+0x020(SB)/8, $4
+DATA ·staticuint64s+0x028(SB)/8, $5
+DATA ·staticuint64s+0x030(SB)/8, $6
+DATA ·staticuint64s+0x038(SB)/8, $7
+DATA ·staticuint64s+0x040(SB)/8, $8
+DATA ·staticuint64s+0x048(SB)/8, $9
+DATA ·staticuint64s+0x050(SB)/8, $10
+DATA ·staticuint64s+0x058(SB)/8, $11
+DATA ·staticuint64s+0x060(SB)/8, $12
+DATA ·staticuint64s+0x068(SB)/8, $13
+DATA ·staticuint64s+0x070(SB)/8, $14
+DATA ·staticuint64s+0x078(SB)/8, $15
+DATA ·staticuint64s+0x080(SB)/8, $16
+DATA ·staticuint64s+0x088(SB)/8, $17
+DATA ·staticuint64s+0x090(SB)/8, $18
+DATA ·staticuint64s+0x098(SB)/8, $19
+DATA ·staticuint64s+0x0a0(SB)/8, $20
+DATA ·staticuint64s+0x0a8(SB)/8, $21
+DATA ·staticuint64s+0x0b0(SB)/8, $22
+DATA ·staticuint64s+0x0b8(SB)/8, $23
+DATA ·staticuint64s+0x0c0(SB)/8, $24
+DATA ·staticuint64s+0x0c8(SB)/8, $25
+DATA ·staticuint64s+0x0d0(SB)/8, $26
+DATA ·staticuint64s+0x0d8(SB)/8, $27
+DATA ·staticuint64s+0x0e0(SB)/8, $28
+DATA ·staticuint64s+0x0e8(SB)/8, $29
+DATA ·staticuint64s+0x0f0(SB)/8, $30
+DATA ·staticuint64s+0x0f8(SB)/8, $31
+DATA ·staticuint64s+0x100(SB)/8, $32
+DATA ·staticuint64s+0x108(SB)/8, $33
+DATA ·staticuint64s+0x110(SB)/8, $34
+DATA ·staticuint64s+0x118(SB)/8, $35
+DATA ·staticuint64s+0x120(SB)/8, $36
+DATA ·staticuint64s+0x128(SB)/8, $37
+DATA ·staticuint64s+0x130(SB)/8, $38
+DATA ·staticuint64s+0x138(SB)/8, $39
+DATA ·staticuint64s+0x140(SB)/8, $40
+DATA ·staticuint64s+0x148(SB)/8, $41
+DATA ·staticuint64s+0x150(SB)/8, $42
+DATA ·staticuint64s+0x158(SB)/8, $43
+DATA ·staticuint64s+0x160(SB)/8, $44
+DATA ·staticuint64s+0x168(SB)/8, $45
+DATA ·staticuint64s+0x170(SB)/8, $46
+DATA ·staticuint64s+0x178(SB)/8, $47
+DATA ·staticuint64s+0x180(SB)/8, $48
+DATA ·staticuint64s+0x188(SB)/8, $49
+DATA ·staticuint64s+0x190(SB)/8, $50
+DATA ·staticuint64s+0x198(SB)/8, $51
+DATA ·staticuint64s+0x1a0(SB)/8, $52
+DATA ·staticuint64s+0x1a8(SB)/8, $53
+DATA ·staticuint64s+0x1b0(SB)/8, $54
+DATA ·staticuint64s+0x1b8(SB)/8, $55
+DATA ·staticuint64s+0x1c0(SB)/8, $56
+DATA ·staticuint64s+0x1c8(SB)/8, $57
+DATA ·staticuint64s+0x1d0(SB)/8, $58
+DATA ·staticuint64s+0x1d8(SB)/8, $59
+DATA ·staticuint64s+0x1e0(SB)/8, $60
+DATA ·staticuint64s+0x1e8(SB)/8, $61
+DATA ·staticuint64s+0x1f0(SB)/8, $62
+DATA ·staticuint64s+0x1f8(SB)/8, $63
+DATA ·staticuint64s+0x200(SB)/8, $64
+DATA ·staticuint64s+0x208(SB)/8, $65
+DATA ·staticuint64s+0x210(SB)/8, $66
+DATA ·staticuint64s+0x218(SB)/8, $67
+DATA ·staticuint64s+0x220(SB)/8, $68
+DATA ·staticuint64s+0x228(SB)/8, $69
+DATA ·staticuint64s+0x230(SB)/8, $70
+DATA ·staticuint64s+0x238(SB)/8, $71
+DATA ·staticuint64s+0x240(SB)/8, $72
+DATA ·staticuint64s+0x248(SB)/8, $73
+DATA ·staticuint64s+0x250(SB)/8, $74
+DATA ·staticuint64s+0x258(SB)/8, $75
+DATA ·staticuint64s+0x260(SB)/8, $76
+DATA ·staticuint64s+0x268(SB)/8, $77
+DATA ·staticuint64s+0x270(SB)/8, $78
+DATA ·staticuint64s+0x278(SB)/8, $79
+DATA ·staticuint64s+0x280(SB)/8, $80
+DATA ·staticuint64s+0x288(SB)/8, $81
+DATA ·staticuint64s+0x290(SB)/8, $82
+DATA ·staticuint64s+0x298(SB)/8, $83
+DATA ·staticuint64s+0x2a0(SB)/8, $84
+DATA ·staticuint64s+0x2a8(SB)/8, $85
+DATA ·staticuint64s+0x2b0(SB)/8, $86
+DATA ·staticuint64s+0x2b8(SB)/8, $87
+DATA ·staticuint64s+0x2c0(SB)/8, $88
+DATA ·staticuint64s+0x2c8(SB)/8, $89
+DATA ·staticuint64s+0x2d0(SB)/8, $90
+DATA ·staticuint64s+0x2d8(SB)/8, $91
+DATA ·staticuint64s+0x2e0(SB)/8, $92
+DATA ·staticuint64s+0x2e8(SB)/8, $93
+DATA ·staticuint64s+0x2f0(SB)/8, $94
+DATA ·staticuint64s+0x2f8(SB)/8, $95
+DATA ·staticuint64s+0x300(SB)/8, $96
+DATA ·staticuint64s+0x308(SB)/8, $97
+DATA ·staticuint64s+0x310(SB)/8, $98
+DATA ·staticuint64s+0x318(SB)/8, $99
+DATA ·staticuint64s+0x320(SB)/8, $100
+DATA ·staticuint64s+0x328(SB)/8, $101
+DATA ·staticuint64s+0x330(SB)/8, $102
+DATA ·staticuint64s+0x338(SB)/8, $103
+DATA ·staticuint64s+0x340(SB)/8, $104
+DATA ·staticuint64s+0x348(SB)/8, $105
+DATA ·staticuint64s+0x350(SB)/8, $106
+DATA ·staticuint64s+0x358(SB)/8, $107
+DATA ·staticuint64s+0x360(SB)/8, $108
+DATA ·staticuint64s+0x368(SB)/8, $109
+DATA ·staticuint64s+0x370(SB)/8, $110
+DATA ·staticuint64s+0x378(SB)/8, $111
+DATA ·staticuint64s+0x380(SB)/8, $112
+DATA ·staticuint64s+0x388(SB)/8, $113
+DATA ·staticuint64s+0x390(SB)/8, $114
+DATA ·staticuint64s+0x398(SB)/8, $115
+DATA ·staticuint64s+0x3a0(SB)/8, $116
+DATA ·staticuint64s+0x3a8(SB)/8, $117
+DATA ·staticuint64s+0x3b0(SB)/8, $118
+DATA ·staticuint64s+0x3b8(SB)/8, $119
+DATA ·staticuint64s+0x3c0(SB)/8, $120
+DATA ·staticuint64s+0x3c8(SB)/8, $121
+DATA ·staticuint64s+0x3d0(SB)/8, $122
+DATA ·staticuint64s+0x3d8(SB)/8, $123
+DATA ·staticuint64s+0x3e0(SB)/8, $124
+DATA ·staticuint64s+0x3e8(SB)/8, $125
+DATA ·staticuint64s+0x3f0(SB)/8, $126
+DATA ·staticuint64s+0x3f8(SB)/8, $127
+DATA ·staticuint64s+0x400(SB)/8, $128
+DATA ·staticuint64s+0x408(SB)/8, $129
+DATA ·staticuint64s+0x410(SB)/8, $130
+DATA ·staticuint64s+0x418(SB)/8, $131
+DATA ·staticuint64s+0x420(SB)/8, $132
+DATA ·staticuint64s+0x428(SB)/8, $133
+DATA ·staticuint64s+0x430(SB)/8, $134
+DATA ·staticuint64s+0x438(SB)/8, $135
+DATA ·staticuint64s+0x440(SB)/8, $136
+DATA ·staticuint64s+0x448(SB)/8, $137
+DATA ·staticuint64s+0x450(SB)/8, $138
+DATA ·staticuint64s+0x458(SB)/8, $139
+DATA ·staticuint64s+0x460(SB)/8, $140
+DATA ·staticuint64s+0x468(SB)/8, $141
+DATA ·staticuint64s+0x470(SB)/8, $142
+DATA ·staticuint64s+0x478(SB)/8, $143
+DATA ·staticuint64s+0x480(SB)/8, $144
+DATA ·staticuint64s+0x488(SB)/8, $145
+DATA ·staticuint64s+0x490(SB)/8, $146
+DATA ·staticuint64s+0x498(SB)/8, $147
+DATA ·staticuint64s+0x4a0(SB)/8, $148
+DATA ·staticuint64s+0x4a8(SB)/8, $149
+DATA ·staticuint64s+0x4b0(SB)/8, $150
+DATA ·staticuint64s+0x4b8(SB)/8, $151
+DATA ·staticuint64s+0x4c0(SB)/8, $152
+DATA ·staticuint64s+0x4c8(SB)/8, $153
+DATA ·staticuint64s+0x4d0(SB)/8, $154
+DATA ·staticuint64s+0x4d8(SB)/8, $155
+DATA ·staticuint64s+0x4e0(SB)/8, $156
+DATA ·staticuint64s+0x4e8(SB)/8, $157
+DATA ·staticuint64s+0x4f0(SB)/8, $158
+DATA ·staticuint64s+0x4f8(SB)/8, $159
+DATA ·staticuint64s+0x500(SB)/8, $160
+DATA ·staticuint64s+0x508(SB)/8, $161
+DATA ·staticuint64s+0x510(SB)/8, $162
+DATA ·staticuint64s+0x518(SB)/8, $163
+DATA ·staticuint64s+0x520(SB)/8, $164
+DATA ·staticuint64s+0x528(SB)/8, $165
+DATA ·staticuint64s+0x530(SB)/8, $166
+DATA ·staticuint64s+0x538(SB)/8, $167
+DATA ·staticuint64s+0x540(SB)/8, $168
+DATA ·staticuint64s+0x548(SB)/8, $169
+DATA ·staticuint64s+0x550(SB)/8, $170
+DATA ·staticuint64s+0x558(SB)/8, $171
+DATA ·staticuint64s+0x560(SB)/8, $172
+DATA ·staticuint64s+0x568(SB)/8, $173
+DATA ·staticuint64s+0x570(SB)/8, $174
+DATA ·staticuint64s+0x578(SB)/8, $175
+DATA ·staticuint64s+0x580(SB)/8, $176
+DATA ·staticuint64s+0x588(SB)/8, $177
+DATA ·staticuint64s+0x590(SB)/8, $178
+DATA ·staticuint64s+0x598(SB)/8, $179
+DATA ·staticuint64s+0x5a0(SB)/8, $180
+DATA ·staticuint64s+0x5a8(SB)/8, $181
+DATA ·staticuint64s+0x5b0(SB)/8, $182
+DATA ·staticuint64s+0x5b8(SB)/8, $183
+DATA ·staticuint64s+0x5c0(SB)/8, $184
+DATA ·staticuint64s+0x5c8(SB)/8, $185
+DATA ·staticuint64s+0x5d0(SB)/8, $186
+DATA ·staticuint64s+0x5d8(SB)/8, $187
+DATA ·staticuint64s+0x5e0(SB)/8, $188
+DATA ·staticuint64s+0x5e8(SB)/8, $189
+DATA ·staticuint64s+0x5f0(SB)/8, $190
+DATA ·staticuint64s+0x5f8(SB)/8, $191
+DATA ·staticuint64s+0x600(SB)/8, $192
+DATA ·staticuint64s+0x608(SB)/8, $193
+DATA ·staticuint64s+0x610(SB)/8, $194
+DATA ·staticuint64s+0x618(SB)/8, $195
+DATA ·staticuint64s+0x620(SB)/8, $196
+DATA ·staticuint64s+0x628(SB)/8, $197
+DATA ·staticuint64s+0x630(SB)/8, $198
+DATA ·staticuint64s+0x638(SB)/8, $199
+DATA ·staticuint64s+0x640(SB)/8, $200
+DATA ·staticuint64s+0x648(SB)/8, $201
+DATA ·staticuint64s+0x650(SB)/8, $202
+DATA ·staticuint64s+0x658(SB)/8, $203
+DATA ·staticuint64s+0x660(SB)/8, $204
+DATA ·staticuint64s+0x668(SB)/8, $205
+DATA ·staticuint64s+0x670(SB)/8, $206
+DATA ·staticuint64s+0x678(SB)/8, $207
+DATA ·staticuint64s+0x680(SB)/8, $208
+DATA ·staticuint64s+0x688(SB)/8, $209
+DATA ·staticuint64s+0x690(SB)/8, $210
+DATA ·staticuint64s+0x698(SB)/8, $211
+DATA ·staticuint64s+0x6a0(SB)/8, $212
+DATA ·staticuint64s+0x6a8(SB)/8, $213
+DATA ·staticuint64s+0x6b0(SB)/8, $214
+DATA ·staticuint64s+0x6b8(SB)/8, $215
+DATA ·staticuint64s+0x6c0(SB)/8, $216
+DATA ·staticuint64s+0x6c8(SB)/8, $217
+DATA ·staticuint64s+0x6d0(SB)/8, $218
+DATA ·staticuint64s+0x6d8(SB)/8, $219
+DATA ·staticuint64s+0x6e0(SB)/8, $220
+DATA ·staticuint64s+0x6e8(SB)/8, $221
+DATA ·staticuint64s+0x6f0(SB)/8, $222
+DATA ·staticuint64s+0x6f8(SB)/8, $223
+DATA ·staticuint64s+0x700(SB)/8, $224
+DATA ·staticuint64s+0x708(SB)/8, $225
+DATA ·staticuint64s+0x710(SB)/8, $226
+DATA ·staticuint64s+0x718(SB)/8, $227
+DATA ·staticuint64s+0x720(SB)/8, $228
+DATA ·staticuint64s+0x728(SB)/8, $229
+DATA ·staticuint64s+0x730(SB)/8, $230
+DATA ·staticuint64s+0x738(SB)/8, $231
+DATA ·staticuint64s+0x740(SB)/8, $232
+DATA ·staticuint64s+0x748(SB)/8, $233
+DATA ·staticuint64s+0x750(SB)/8, $234
+DATA ·staticuint64s+0x758(SB)/8, $235
+DATA ·staticuint64s+0x760(SB)/8, $236
+DATA ·staticuint64s+0x768(SB)/8, $237
+DATA ·staticuint64s+0x770(SB)/8, $238
+DATA ·staticuint64s+0x778(SB)/8, $239
+DATA ·staticuint64s+0x780(SB)/8, $240
+DATA ·staticuint64s+0x788(SB)/8, $241
+DATA ·staticuint64s+0x790(SB)/8, $242
+DATA ·staticuint64s+0x798(SB)/8, $243
+DATA ·staticuint64s+0x7a0(SB)/8, $244
+DATA ·staticuint64s+0x7a8(SB)/8, $245
+DATA ·staticuint64s+0x7b0(SB)/8, $246
+DATA ·staticuint64s+0x7b8(SB)/8, $247
+DATA ·staticuint64s+0x7c0(SB)/8, $248
+DATA ·staticuint64s+0x7c8(SB)/8, $249
+DATA ·staticuint64s+0x7d0(SB)/8, $250
+DATA ·staticuint64s+0x7d8(SB)/8, $251
+DATA ·staticuint64s+0x7e0(SB)/8, $252
+DATA ·staticuint64s+0x7e8(SB)/8, $253
+DATA ·staticuint64s+0x7f0(SB)/8, $254
+DATA ·staticuint64s+0x7f8(SB)/8, $255
+
+GLOBL ·staticuint64s(SB), RODATA, $0x800
diff --git a/src/runtime/linkname.go b/src/runtime/linkname.go
index dd7f6742..eec190c3 100644
--- a/src/runtime/linkname.go
+++ b/src/runtime/linkname.go
@@ -13,6 +13,7 @@ import _ "unsafe"
 //go:linkname _cgo_panic_internal
 //go:linkname cgoAlwaysFalse
 //go:linkname cgoUse
+//go:linkname cgoKeepAlive
 //go:linkname cgoCheckPointer
 //go:linkname cgoCheckResult
 //go:linkname cgoNoCallback
diff --git a/src/runtime/linkname_swiss.go b/src/runtime/linkname_swiss.go
new file mode 100644
index 00000000..1be72447
--- /dev/null
+++ b/src/runtime/linkname_swiss.go
@@ -0,0 +1,211 @@
+// Copyright 2025 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build goexperiment.swissmap
+
+package runtime
+
+import (
+	"internal/abi"
+	"internal/runtime/maps"
+	"internal/runtime/sys"
+	"unsafe"
+)
+
+// Legacy //go:linkname compatibility shims
+//
+// The functions below are unused by the toolchain, and exist only for
+// compatibility with existing //go:linkname use in the ecosystem (and in
+// map_noswiss.go for normal use via GOEXPERIMENT=noswissmap).
+
+// linknameIter is the it argument to mapiterinit and mapiternext.
+//
+// Callers of mapiterinit allocate their own iter structure, which has the
+// layout of the pre-Go 1.24 hiter structure, shown here for posterity:
+//
+//	type hiter struct {
+//		key         unsafe.Pointer
+//		elem        unsafe.Pointer
+//		t           *maptype
+//		h           *hmap
+//		buckets     unsafe.Pointer
+//		bptr        *bmap
+//		overflow    *[]*bmap
+//		oldoverflow *[]*bmap
+//		startBucket uintptr
+//		offset      uint8
+//		wrapped     bool
+//		B           uint8
+//		i           uint8
+//		bucket      uintptr
+//		checkBucket uintptr
+//	}
+//
+// Our structure must maintain compatibility with the old structure. This
+// means:
+//
+//   - Our structure must be the same size or smaller than hiter. Otherwise we
+//     may write outside the caller's hiter allocation.
+//   - Our structure must have the same pointer layout as hiter, so that the GC
+//     tracks pointers properly.
+//
+// Based on analysis of the "hall of shame" users of these linknames:
+//
+//   - The key and elem fields must be kept up to date with the current key/elem.
+//     Some users directly access the key and elem fields rather than calling
+//     reflect.mapiterkey/reflect.mapiterelem.
+//   - The t field must be non-nil after mapiterinit. gonum.org/v1/gonum uses
+//     this to verify the iterator is initialized.
+//   - github.com/segmentio/encoding and github.com/RomiChan/protobuf check if h
+//     is non-nil, but the code has no effect. Thus the value of h does not
+//     matter. See internal/runtime_reflect/map.go.
+type linknameIter struct {
+	// Fields from hiter.
+	key  unsafe.Pointer
+	elem unsafe.Pointer
+	typ  *abi.SwissMapType
+
+	// The real iterator.
+	it *maps.Iter
+}
+
+// mapiterinit is a compatibility wrapper for map iterator for users of
+// //go:linkname from before Go 1.24. It is not used by Go itself. New users
+// should use reflect or the maps package.
+//
+// mapiterinit should be an internal detail,
+// but widely used packages access it using linkname.
+// Notable members of the hall of shame include:
+//   - github.com/bytedance/sonic
+//   - github.com/goccy/go-json
+//   - github.com/RomiChan/protobuf
+//   - github.com/segmentio/encoding
+//   - github.com/ugorji/go/codec
+//   - github.com/wI2L/jettison
+//
+// Do not remove or change the type signature.
+// See go.dev/issue/67401.
+//
+//go:linkname mapiterinit
+func mapiterinit(t *abi.SwissMapType, m *maps.Map, it *linknameIter) {
+	if raceenabled && m != nil {
+		callerpc := sys.GetCallerPC()
+		racereadpc(unsafe.Pointer(m), callerpc, abi.FuncPCABIInternal(mapiterinit))
+	}
+
+	it.typ = t
+
+	it.it = new(maps.Iter)
+	it.it.Init(t, m)
+	it.it.Next()
+
+	it.key = it.it.Key()
+	it.elem = it.it.Elem()
+}
+
+// reflect_mapiterinit is a compatibility wrapper for map iterator for users of
+// //go:linkname from before Go 1.24. It is not used by Go itself. New users
+// should use reflect or the maps package.
+//
+// reflect_mapiterinit should be an internal detail,
+// but widely used packages access it using linkname.
+// Notable members of the hall of shame include:
+//   - github.com/modern-go/reflect2
+//   - gitee.com/quant1x/gox
+//   - github.com/v2pro/plz
+//   - github.com/wI2L/jettison
+//
+// Do not remove or change the type signature.
+// See go.dev/issue/67401.
+//
+//go:linkname reflect_mapiterinit reflect.mapiterinit
+func reflect_mapiterinit(t *abi.SwissMapType, m *maps.Map, it *linknameIter) {
+	mapiterinit(t, m, it)
+}
+
+// mapiternext is a compatibility wrapper for map iterator for users of
+// //go:linkname from before Go 1.24. It is not used by Go itself. New users
+// should use reflect or the maps package.
+//
+// mapiternext should be an internal detail,
+// but widely used packages access it using linkname.
+// Notable members of the hall of shame include:
+//   - github.com/bytedance/sonic
+//   - github.com/RomiChan/protobuf
+//   - github.com/segmentio/encoding
+//   - github.com/ugorji/go/codec
+//   - gonum.org/v1/gonum
+//
+// Do not remove or change the type signature.
+// See go.dev/issue/67401.
+//
+//go:linkname mapiternext
+func mapiternext(it *linknameIter) {
+	if raceenabled {
+		callerpc := sys.GetCallerPC()
+		racereadpc(unsafe.Pointer(it.it.Map()), callerpc, abi.FuncPCABIInternal(mapiternext))
+	}
+
+	it.it.Next()
+
+	it.key = it.it.Key()
+	it.elem = it.it.Elem()
+}
+
+// reflect_mapiternext is a compatibility wrapper for map iterator for users of
+// //go:linkname from before Go 1.24. It is not used by Go itself. New users
+// should use reflect or the maps package.
+//
+// reflect_mapiternext is for package reflect,
+// but widely used packages access it using linkname.
+// Notable members of the hall of shame include:
+//   - gitee.com/quant1x/gox
+//   - github.com/modern-go/reflect2
+//   - github.com/goccy/go-json
+//   - github.com/v2pro/plz
+//   - github.com/wI2L/jettison
+//
+// Do not remove or change the type signature.
+// See go.dev/issue/67401.
+//
+//go:linkname reflect_mapiternext reflect.mapiternext
+func reflect_mapiternext(it *linknameIter) {
+	mapiternext(it)
+}
+
+// reflect_mapiterkey is a compatibility wrapper for map iterator for users of
+// //go:linkname from before Go 1.24. It is not used by Go itself. New users
+// should use reflect or the maps package.
+//
+// reflect_mapiterkey should be an internal detail,
+// but widely used packages access it using linkname.
+// Notable members of the hall of shame include:
+//   - github.com/goccy/go-json
+//   - gonum.org/v1/gonum
+//
+// Do not remove or change the type signature.
+// See go.dev/issue/67401.
+//
+//go:linkname reflect_mapiterkey reflect.mapiterkey
+func reflect_mapiterkey(it *linknameIter) unsafe.Pointer {
+	return it.it.Key()
+}
+
+// reflect_mapiterelem is a compatibility wrapper for map iterator for users of
+// //go:linkname from before Go 1.24. It is not used by Go itself. New users
+// should use reflect or the maps package.
+//
+// reflect_mapiterelem should be an internal detail,
+// but widely used packages access it using linkname.
+// Notable members of the hall of shame include:
+//   - github.com/goccy/go-json
+//   - gonum.org/v1/gonum
+//
+// Do not remove or change the type signature.
+// See go.dev/issue/67401.
+//
+//go:linkname reflect_mapiterelem reflect.mapiterelem
+func reflect_mapiterelem(it *linknameIter) unsafe.Pointer {
+	return it.it.Elem()
+}
diff --git a/src/runtime/lock_futex.go b/src/runtime/lock_futex.go
index 58690e45..1cf146b4 100644
--- a/src/runtime/lock_futex.go
+++ b/src/runtime/lock_futex.go
@@ -11,32 +11,6 @@ import (
 	"unsafe"
 )
 
-// This implementation depends on OS-specific implementations of
-//
-//	futexsleep(addr *uint32, val uint32, ns int64)
-//		Atomically,
-//			if *addr == val { sleep }
-//		Might be woken up spuriously; that's allowed.
-//		Don't sleep longer than ns; ns < 0 means forever.
-//
-//	futexwakeup(addr *uint32, cnt uint32)
-//		If any procs are sleeping on addr, wake up at most cnt.
-
-const (
-	mutex_unlocked = 0
-	mutex_locked   = 1
-	mutex_sleeping = 2
-
-	active_spin     = 4
-	active_spin_cnt = 30
-	passive_spin    = 1
-)
-
-// Possible lock states are mutex_unlocked, mutex_locked and mutex_sleeping.
-// mutex_sleeping means that there is presumably at least one sleeping thread.
-// Note that there can be spinning threads during all states - they do not
-// affect mutex's state.
-
 // We use the uintptr mutex.key and note.key as a uint32.
 //
 //go:nosplit
@@ -44,103 +18,6 @@ func key32(p *uintptr) *uint32 {
 	return (*uint32)(unsafe.Pointer(p))
 }
 
-func mutexContended(l *mutex) bool {
-	return atomic.Load(key32(&l.key)) > mutex_locked
-}
-
-func lock(l *mutex) {
-	lockWithRank(l, getLockRank(l))
-}
-
-func lock2(l *mutex) {
-	gp := getg()
-
-	if gp.m.locks < 0 {
-		throw("runtime·lock: lock count")
-	}
-	gp.m.locks++
-
-	// Speculative grab for lock.
-	v := atomic.Xchg(key32(&l.key), mutex_locked)
-	if v == mutex_unlocked {
-		return
-	}
-
-	// wait is either MUTEX_LOCKED or MUTEX_SLEEPING
-	// depending on whether there is a thread sleeping
-	// on this mutex. If we ever change l->key from
-	// MUTEX_SLEEPING to some other value, we must be
-	// careful to change it back to MUTEX_SLEEPING before
-	// returning, to ensure that the sleeping thread gets
-	// its wakeup call.
-	wait := v
-
-	timer := &lockTimer{lock: l}
-	timer.begin()
-	// On uniprocessors, no point spinning.
-	// On multiprocessors, spin for ACTIVE_SPIN attempts.
-	spin := 0
-	if ncpu > 1 {
-		spin = active_spin
-	}
-	for {
-		// Try for lock, spinning.
-		for i := 0; i < spin; i++ {
-			for l.key == mutex_unlocked {
-				if atomic.Cas(key32(&l.key), mutex_unlocked, wait) {
-					timer.end()
-					return
-				}
-			}
-			procyield(active_spin_cnt)
-		}
-
-		// Try for lock, rescheduling.
-		for i := 0; i < passive_spin; i++ {
-			for l.key == mutex_unlocked {
-				if atomic.Cas(key32(&l.key), mutex_unlocked, wait) {
-					timer.end()
-					return
-				}
-			}
-			osyield()
-		}
-
-		// Sleep.
-		v = atomic.Xchg(key32(&l.key), mutex_sleeping)
-		if v == mutex_unlocked {
-			timer.end()
-			return
-		}
-		wait = mutex_sleeping
-		futexsleep(key32(&l.key), mutex_sleeping, -1)
-	}
-}
-
-func unlock(l *mutex) {
-	unlockWithRank(l)
-}
-
-func unlock2(l *mutex) {
-	v := atomic.Xchg(key32(&l.key), mutex_unlocked)
-	if v == mutex_unlocked {
-		throw("unlock of unlocked lock")
-	}
-	if v == mutex_sleeping {
-		futexwakeup(key32(&l.key), 1)
-	}
-
-	gp := getg()
-	gp.m.mLockProfile.recordUnlock(l)
-	gp.m.locks--
-	if gp.m.locks < 0 {
-		throw("runtime·unlock: lock count")
-	}
-	if gp.m.locks == 0 && gp.preempt { // restore the preemption request in case we've cleared it in newstack
-		gp.stackguard0 = stackPreempt
-	}
-}
-
 // One-time notifications.
 func noteclear(n *note) {
 	n.key = 0
@@ -254,3 +131,33 @@ func beforeIdle(int64, int64) (*g, bool) {
 }
 
 func checkTimeouts() {}
+
+//go:nosplit
+func semacreate(mp *m) {}
+
+//go:nosplit
+func semasleep(ns int64) int32 {
+	mp := getg().m
+
+	for v := atomic.Xadd(&mp.waitsema, -1); ; v = atomic.Load(&mp.waitsema) {
+		if int32(v) >= 0 {
+			return 0
+		}
+		futexsleep(&mp.waitsema, v, ns)
+		if ns >= 0 {
+			if int32(v) >= 0 {
+				return 0
+			} else {
+				return -1
+			}
+		}
+	}
+}
+
+//go:nosplit
+func semawakeup(mp *m) {
+	v := atomic.Xadd(&mp.waitsema, 1)
+	if v == 0 {
+		futexwakeup(&mp.waitsema, 1)
+	}
+}
diff --git a/src/runtime/lock_futex_tristate.go b/src/runtime/lock_futex_tristate.go
new file mode 100644
index 00000000..b7df18c8
--- /dev/null
+++ b/src/runtime/lock_futex_tristate.go
@@ -0,0 +1,138 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build (dragonfly || freebsd || linux) && !goexperiment.spinbitmutex
+
+package runtime
+
+import (
+	"internal/runtime/atomic"
+)
+
+// This implementation depends on OS-specific implementations of
+//
+//	futexsleep(addr *uint32, val uint32, ns int64)
+//		Atomically,
+//			if *addr == val { sleep }
+//		Might be woken up spuriously; that's allowed.
+//		Don't sleep longer than ns; ns < 0 means forever.
+//
+//	futexwakeup(addr *uint32, cnt uint32)
+//		If any procs are sleeping on addr, wake up at most cnt.
+
+const (
+	mutex_unlocked = 0
+	mutex_locked   = 1
+	mutex_sleeping = 2
+
+	active_spin     = 4
+	active_spin_cnt = 30
+	passive_spin    = 1
+)
+
+// Possible lock states are mutex_unlocked, mutex_locked and mutex_sleeping.
+// mutex_sleeping means that there is presumably at least one sleeping thread.
+// Note that there can be spinning threads during all states - they do not
+// affect mutex's state.
+
+type mWaitList struct{}
+
+func lockVerifyMSize() {}
+
+func mutexContended(l *mutex) bool {
+	return atomic.Load(key32(&l.key)) > mutex_locked
+}
+
+func lock(l *mutex) {
+	lockWithRank(l, getLockRank(l))
+}
+
+func lock2(l *mutex) {
+	gp := getg()
+
+	if gp.m.locks < 0 {
+		throw("runtime·lock: lock count")
+	}
+	gp.m.locks++
+
+	// Speculative grab for lock.
+	v := atomic.Xchg(key32(&l.key), mutex_locked)
+	if v == mutex_unlocked {
+		return
+	}
+
+	// wait is either MUTEX_LOCKED or MUTEX_SLEEPING
+	// depending on whether there is a thread sleeping
+	// on this mutex. If we ever change l->key from
+	// MUTEX_SLEEPING to some other value, we must be
+	// careful to change it back to MUTEX_SLEEPING before
+	// returning, to ensure that the sleeping thread gets
+	// its wakeup call.
+	wait := v
+
+	timer := &lockTimer{lock: l}
+	timer.begin()
+	// On uniprocessors, no point spinning.
+	// On multiprocessors, spin for ACTIVE_SPIN attempts.
+	spin := 0
+	if ncpu > 1 {
+		spin = active_spin
+	}
+	for {
+		// Try for lock, spinning.
+		for i := 0; i < spin; i++ {
+			for l.key == mutex_unlocked {
+				if atomic.Cas(key32(&l.key), mutex_unlocked, wait) {
+					timer.end()
+					return
+				}
+			}
+			procyield(active_spin_cnt)
+		}
+
+		// Try for lock, rescheduling.
+		for i := 0; i < passive_spin; i++ {
+			for l.key == mutex_unlocked {
+				if atomic.Cas(key32(&l.key), mutex_unlocked, wait) {
+					timer.end()
+					return
+				}
+			}
+			osyield()
+		}
+
+		// Sleep.
+		v = atomic.Xchg(key32(&l.key), mutex_sleeping)
+		if v == mutex_unlocked {
+			timer.end()
+			return
+		}
+		wait = mutex_sleeping
+		futexsleep(key32(&l.key), mutex_sleeping, -1)
+	}
+}
+
+func unlock(l *mutex) {
+	unlockWithRank(l)
+}
+
+func unlock2(l *mutex) {
+	v := atomic.Xchg(key32(&l.key), mutex_unlocked)
+	if v == mutex_unlocked {
+		throw("unlock of unlocked lock")
+	}
+	if v == mutex_sleeping {
+		futexwakeup(key32(&l.key), 1)
+	}
+
+	gp := getg()
+	gp.m.mLockProfile.recordUnlock(l)
+	gp.m.locks--
+	if gp.m.locks < 0 {
+		throw("runtime·unlock: lock count")
+	}
+	if gp.m.locks == 0 && gp.preempt { // restore the preemption request in case we've cleared it in newstack
+		gp.stackguard0 = stackPreempt
+	}
+}
diff --git a/src/runtime/lock_js.go b/src/runtime/lock_js.go
index b6ee5ec7..a40e3010 100644
--- a/src/runtime/lock_js.go
+++ b/src/runtime/lock_js.go
@@ -6,7 +6,10 @@
 
 package runtime
 
-import _ "unsafe" // for go:linkname
+import (
+	"internal/runtime/sys"
+	_ "unsafe" // for go:linkname
+)
 
 // js/wasm has no support for threads yet. There is no preemption.
 
@@ -23,6 +26,10 @@ const (
 	passive_spin    = 1
 )
 
+type mWaitList struct{}
+
+func lockVerifyMSize() {}
+
 func mutexContended(l *mutex) bool {
 	return false
 }
@@ -63,29 +70,21 @@ func unlock2(l *mutex) {
 
 // One-time notifications.
 
-type noteWithTimeout struct {
-	gp       *g
-	deadline int64
-}
-
-var (
-	notes            = make(map[*note]*g)
-	notesWithTimeout = make(map[*note]noteWithTimeout)
-)
+// Linked list of notes with a deadline.
+var allDeadlineNotes *note
 
 func noteclear(n *note) {
-	n.key = note_cleared
+	n.status = note_cleared
 }
 
 func notewakeup(n *note) {
-	// gp := getg()
-	if n.key == note_woken {
+	if n.status == note_woken {
 		throw("notewakeup - double wakeup")
 	}
-	cleared := n.key == note_cleared
-	n.key = note_woken
+	cleared := n.status == note_cleared
+	n.status = note_woken
 	if cleared {
-		goready(notes[n], 1)
+		goready(n.gp, 1)
 	}
 }
 
@@ -113,48 +112,50 @@ func notetsleepg(n *note, ns int64) bool {
 		}
 
 		id := scheduleTimeoutEvent(delay)
-		mp := acquirem()
-		notes[n] = gp
-		notesWithTimeout[n] = noteWithTimeout{gp: gp, deadline: deadline}
-		releasem(mp)
+
+		n.gp = gp
+		n.deadline = deadline
+		if allDeadlineNotes != nil {
+			allDeadlineNotes.allprev = n
+		}
+		n.allnext = allDeadlineNotes
+		allDeadlineNotes = n
 
 		gopark(nil, nil, waitReasonSleep, traceBlockSleep, 1)
 
 		clearTimeoutEvent(id) // note might have woken early, clear timeout
 
-		mp = acquirem()
-		delete(notes, n)
-		delete(notesWithTimeout, n)
-		releasem(mp)
+		n.gp = nil
+		n.deadline = 0
+		if n.allprev != nil {
+			n.allprev.allnext = n.allnext
+		}
+		if allDeadlineNotes == n {
+			allDeadlineNotes = n.allnext
+		}
+		n.allprev = nil
+		n.allnext = nil
 
-		return n.key == note_woken
+		return n.status == note_woken
 	}
 
-	for n.key != note_woken {
-		mp := acquirem()
-		notes[n] = gp
-		releasem(mp)
+	for n.status != note_woken {
+		n.gp = gp
 
 		gopark(nil, nil, waitReasonZero, traceBlockGeneric, 1)
 
-		mp = acquirem()
-		delete(notes, n)
-		releasem(mp)
+		n.gp = nil
 	}
 	return true
 }
 
 // checkTimeouts resumes goroutines that are waiting on a note which has reached its deadline.
-// TODO(drchase): need to understand if write barriers are really okay in this context.
-//
-//go:yeswritebarrierrec
 func checkTimeouts() {
 	now := nanotime()
-	// TODO: map iteration has the write barriers in it; is that okay?
-	for n, nt := range notesWithTimeout {
-		if n.key == note_cleared && now >= nt.deadline {
-			n.key = note_timeout
-			goready(nt.gp, 1)
+	for n := allDeadlineNotes; n != nil; n = n.allnext {
+		if n.status == note_cleared && n.deadline != 0 && now >= n.deadline {
+			n.status = note_timeout
+			goready(n.gp, 1)
 		}
 	}
 }
@@ -250,7 +251,7 @@ var idleStart int64
 
 func handleAsyncEvent() {
 	idleStart = nanotime()
-	pause(getcallersp() - 16)
+	pause(sys.GetCallerSP() - 16)
 }
 
 // clearIdleTimeout clears our record of the timeout started by beforeIdle.
@@ -259,9 +260,6 @@ func clearIdleTimeout() {
 	idleTimeout = nil
 }
 
-// pause sets SP to newsp and pauses the execution of Go's WebAssembly code until an event is triggered.
-func pause(newsp uintptr)
-
 // scheduleTimeoutEvent tells the WebAssembly environment to trigger an event after ms milliseconds.
 // It returns a timer id that can be used with clearTimeoutEvent.
 //
@@ -300,7 +298,7 @@ func handleEvent() {
 
 	// return execution to JavaScript
 	idleStart = nanotime()
-	pause(getcallersp() - 16)
+	pause(sys.GetCallerSP() - 16)
 }
 
 // eventHandler retrieves and executes handlers for pending JavaScript events.
diff --git a/src/runtime/lock_sema.go b/src/runtime/lock_sema.go
index 32d2235a..3e1b07b9 100644
--- a/src/runtime/lock_sema.go
+++ b/src/runtime/lock_sema.go
@@ -11,131 +11,10 @@ import (
 	"unsafe"
 )
 
-// This implementation depends on OS-specific implementations of
-//
-//	func semacreate(mp *m)
-//		Create a semaphore for mp, if it does not already have one.
-//
-//	func semasleep(ns int64) int32
-//		If ns < 0, acquire m's semaphore and return 0.
-//		If ns >= 0, try to acquire m's semaphore for at most ns nanoseconds.
-//		Return 0 if the semaphore was acquired, -1 if interrupted or timed out.
-//
-//	func semawakeup(mp *m)
-//		Wake up mp, which is or will soon be sleeping on its semaphore.
 const (
 	locked uintptr = 1
-
-	active_spin     = 4
-	active_spin_cnt = 30
-	passive_spin    = 1
 )
 
-func mutexContended(l *mutex) bool {
-	return atomic.Loaduintptr(&l.key) > locked
-}
-
-func lock(l *mutex) {
-	lockWithRank(l, getLockRank(l))
-}
-
-func lock2(l *mutex) {
-	gp := getg()
-	if gp.m.locks < 0 {
-		throw("runtime·lock: lock count")
-	}
-	gp.m.locks++
-
-	// Speculative grab for lock.
-	if atomic.Casuintptr(&l.key, 0, locked) {
-		return
-	}
-	semacreate(gp.m)
-
-	timer := &lockTimer{lock: l}
-	timer.begin()
-	// On uniprocessor's, no point spinning.
-	// On multiprocessors, spin for ACTIVE_SPIN attempts.
-	spin := 0
-	if ncpu > 1 {
-		spin = active_spin
-	}
-Loop:
-	for i := 0; ; i++ {
-		v := atomic.Loaduintptr(&l.key)
-		if v&locked == 0 {
-			// Unlocked. Try to lock.
-			if atomic.Casuintptr(&l.key, v, v|locked) {
-				timer.end()
-				return
-			}
-			i = 0
-		}
-		if i < spin {
-			procyield(active_spin_cnt)
-		} else if i < spin+passive_spin {
-			osyield()
-		} else {
-			// Someone else has it.
-			// l->waitm points to a linked list of M's waiting
-			// for this lock, chained through m->nextwaitm.
-			// Queue this M.
-			for {
-				gp.m.nextwaitm = muintptr(v &^ locked)
-				if atomic.Casuintptr(&l.key, v, uintptr(unsafe.Pointer(gp.m))|locked) {
-					break
-				}
-				v = atomic.Loaduintptr(&l.key)
-				if v&locked == 0 {
-					continue Loop
-				}
-			}
-			if v&locked != 0 {
-				// Queued. Wait.
-				semasleep(-1)
-				i = 0
-			}
-		}
-	}
-}
-
-func unlock(l *mutex) {
-	unlockWithRank(l)
-}
-
-// We might not be holding a p in this code.
-//
-//go:nowritebarrier
-func unlock2(l *mutex) {
-	gp := getg()
-	var mp *m
-	for {
-		v := atomic.Loaduintptr(&l.key)
-		if v == locked {
-			if atomic.Casuintptr(&l.key, locked, 0) {
-				break
-			}
-		} else {
-			// Other M's are waiting for the lock.
-			// Dequeue an M.
-			mp = muintptr(v &^ locked).ptr()
-			if atomic.Casuintptr(&l.key, v, uintptr(mp.nextwaitm)) {
-				// Dequeued an M.  Wake it.
-				semawakeup(mp)
-				break
-			}
-		}
-	}
-	gp.m.mLockProfile.recordUnlock(l)
-	gp.m.locks--
-	if gp.m.locks < 0 {
-		throw("runtime·unlock: lock count")
-	}
-	if gp.m.locks == 0 && gp.preempt { // restore the preemption request in case we've cleared it in newstack
-		gp.stackguard0 = stackPreempt
-	}
-}
-
 // One-time notifications.
 func noteclear(n *note) {
 	n.key = 0
diff --git a/src/runtime/lock_sema_tristate.go b/src/runtime/lock_sema_tristate.go
new file mode 100644
index 00000000..4375791d
--- /dev/null
+++ b/src/runtime/lock_sema_tristate.go
@@ -0,0 +1,148 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build (aix || darwin || netbsd || openbsd || plan9 || solaris || windows) && !goexperiment.spinbitmutex
+
+package runtime
+
+import (
+	"internal/runtime/atomic"
+	"unsafe"
+)
+
+// This implementation depends on OS-specific implementations of
+//
+//	func semacreate(mp *m)
+//		Create a semaphore for mp, if it does not already have one.
+//
+//	func semasleep(ns int64) int32
+//		If ns < 0, acquire m's semaphore and return 0.
+//		If ns >= 0, try to acquire m's semaphore for at most ns nanoseconds.
+//		Return 0 if the semaphore was acquired, -1 if interrupted or timed out.
+//
+//	func semawakeup(mp *m)
+//		Wake up mp, which is or will soon be sleeping on its semaphore.
+const (
+	active_spin     = 4
+	active_spin_cnt = 30
+	passive_spin    = 1
+)
+
+// mWaitList is part of the M struct, and holds the list of Ms that are waiting
+// for a particular runtime.mutex.
+//
+// When an M is unable to immediately obtain a lock, it adds itself to the list
+// of Ms waiting for the lock. It does that via this struct's next field,
+// forming a singly-linked list with the mutex's key field pointing to the head
+// of the list.
+type mWaitList struct {
+	next muintptr // next m waiting for lock
+}
+
+func lockVerifyMSize() {}
+
+func mutexContended(l *mutex) bool {
+	return atomic.Loaduintptr(&l.key) > locked
+}
+
+func lock(l *mutex) {
+	lockWithRank(l, getLockRank(l))
+}
+
+func lock2(l *mutex) {
+	gp := getg()
+	if gp.m.locks < 0 {
+		throw("runtime·lock: lock count")
+	}
+	gp.m.locks++
+
+	// Speculative grab for lock.
+	if atomic.Casuintptr(&l.key, 0, locked) {
+		return
+	}
+	semacreate(gp.m)
+
+	timer := &lockTimer{lock: l}
+	timer.begin()
+	// On uniprocessor's, no point spinning.
+	// On multiprocessors, spin for ACTIVE_SPIN attempts.
+	spin := 0
+	if ncpu > 1 {
+		spin = active_spin
+	}
+Loop:
+	for i := 0; ; i++ {
+		v := atomic.Loaduintptr(&l.key)
+		if v&locked == 0 {
+			// Unlocked. Try to lock.
+			if atomic.Casuintptr(&l.key, v, v|locked) {
+				timer.end()
+				return
+			}
+			i = 0
+		}
+		if i < spin {
+			procyield(active_spin_cnt)
+		} else if i < spin+passive_spin {
+			osyield()
+		} else {
+			// Someone else has it.
+			// l.key points to a linked list of M's waiting
+			// for this lock, chained through m.mWaitList.next.
+			// Queue this M.
+			for {
+				gp.m.mWaitList.next = muintptr(v &^ locked)
+				if atomic.Casuintptr(&l.key, v, uintptr(unsafe.Pointer(gp.m))|locked) {
+					break
+				}
+				v = atomic.Loaduintptr(&l.key)
+				if v&locked == 0 {
+					continue Loop
+				}
+			}
+			if v&locked != 0 {
+				// Queued. Wait.
+				semasleep(-1)
+				i = 0
+			}
+		}
+	}
+}
+
+func unlock(l *mutex) {
+	unlockWithRank(l)
+}
+
+// We might not be holding a p in this code.
+//
+//go:nowritebarrier
+func unlock2(l *mutex) {
+	gp := getg()
+	var mp *m
+	for {
+		v := atomic.Loaduintptr(&l.key)
+		if v == locked {
+			if atomic.Casuintptr(&l.key, locked, 0) {
+				break
+			}
+		} else {
+			// Other M's are waiting for the lock.
+			// Dequeue an M.
+			mp = muintptr(v &^ locked).ptr()
+			if atomic.Casuintptr(&l.key, v, uintptr(mp.mWaitList.next)) {
+				// Dequeued an M.  Wake it.
+				semawakeup(mp) // no use of mp after this point; it's awake
+				break
+			}
+		}
+	}
+	gp.m.mLockProfile.recordUnlock(l)
+	gp.m.locks--
+	if gp.m.locks < 0 {
+		throw("runtime·unlock: lock count")
+	}
+	if gp.m.locks == 0 && gp.preempt { // restore the preemption request in case we've cleared it in newstack
+		gp.stackguard0 = stackPreempt
+	}
+}
diff --git a/src/runtime/lock_spinbit.go b/src/runtime/lock_spinbit.go
new file mode 100644
index 00000000..7e84f3e1
--- /dev/null
+++ b/src/runtime/lock_spinbit.go
@@ -0,0 +1,372 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build (aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || plan9 || solaris || windows) && goexperiment.spinbitmutex
+
+package runtime
+
+import (
+	"internal/goarch"
+	"internal/runtime/atomic"
+	"unsafe"
+)
+
+// This implementation depends on OS-specific implementations of
+//
+//	func semacreate(mp *m)
+//		Create a semaphore for mp, if it does not already have one.
+//
+//	func semasleep(ns int64) int32
+//		If ns < 0, acquire m's semaphore and return 0.
+//		If ns >= 0, try to acquire m's semaphore for at most ns nanoseconds.
+//		Return 0 if the semaphore was acquired, -1 if interrupted or timed out.
+//
+//	func semawakeup(mp *m)
+//		Wake up mp, which is or will soon be sleeping on its semaphore.
+
+// The mutex state consists of four flags and a pointer. The flag at bit 0,
+// mutexLocked, represents the lock itself. Bit 1, mutexSleeping, is a hint that
+// the pointer is non-nil. The fast paths for locking and unlocking the mutex
+// are based on atomic 8-bit swap operations on the low byte; bits 2 through 7
+// are unused.
+//
+// Bit 8, mutexSpinning, is a try-lock that grants a waiting M permission to
+// spin on the state word. Most other Ms must attempt to spend their time
+// sleeping to reduce traffic on the cache line. This is the "spin bit" for
+// which the implementation is named. (The anti-starvation mechanism also grants
+// temporary permission for an M to spin.)
+//
+// Bit 9, mutexStackLocked, is a try-lock that grants an unlocking M permission
+// to inspect the list of waiting Ms and to pop an M off of that stack.
+//
+// The upper bits hold a (partial) pointer to the M that most recently went to
+// sleep. The sleeping Ms form a stack linked by their mWaitList.next fields.
+// Because the fast paths use an 8-bit swap on the low byte of the state word,
+// we'll need to reconstruct the full M pointer from the bits we have. Most Ms
+// are allocated on the heap, and have a known alignment and base offset. (The
+// offset is due to mallocgc's allocation headers.) The main program thread uses
+// a static M value, m0. We check for m0 specifically and add a known offset
+// otherwise.
+
+const (
+	active_spin     = 4  // referenced in proc.go for sync.Mutex implementation
+	active_spin_cnt = 30 // referenced in proc.go for sync.Mutex implementation
+)
+
+const (
+	mutexLocked      = 0x001
+	mutexSleeping    = 0x002
+	mutexSpinning    = 0x100
+	mutexStackLocked = 0x200
+	mutexMMask       = 0x3FF
+	mutexMOffset     = mallocHeaderSize // alignment of heap-allocated Ms (those other than m0)
+
+	mutexActiveSpinCount  = 4
+	mutexActiveSpinSize   = 30
+	mutexPassiveSpinCount = 1
+
+	mutexTailWakePeriod = 16
+)
+
+//go:nosplit
+func key8(p *uintptr) *uint8 {
+	if goarch.BigEndian {
+		return &(*[8]uint8)(unsafe.Pointer(p))[goarch.PtrSize/1-1]
+	}
+	return &(*[8]uint8)(unsafe.Pointer(p))[0]
+}
+
+// mWaitList is part of the M struct, and holds the list of Ms that are waiting
+// for a particular runtime.mutex.
+//
+// When an M is unable to immediately obtain a lock, it adds itself to the list
+// of Ms waiting for the lock. It does that via this struct's next field,
+// forming a singly-linked list with the mutex's key field pointing to the head
+// of the list.
+type mWaitList struct {
+	next muintptr // next m waiting for lock
+}
+
+// lockVerifyMSize confirms that we can recreate the low bits of the M pointer.
+func lockVerifyMSize() {
+	size := roundupsize(unsafe.Sizeof(m{}), false) + mallocHeaderSize
+	if size&mutexMMask != 0 {
+		print("M structure uses sizeclass ", size, "/", hex(size), " bytes; ",
+			"incompatible with mutex flag mask ", hex(mutexMMask), "\n")
+		throw("runtime.m memory alignment too small for spinbit mutex")
+	}
+}
+
+// mutexWaitListHead recovers a full muintptr that was missing its low bits.
+// With the exception of the static m0 value, it requires allocating runtime.m
+// values in a size class with a particular minimum alignment. The 2048-byte
+// size class allows recovering the full muintptr value even after overwriting
+// the low 11 bits with flags. We can use those 11 bits as 3 flags and an
+// atomically-swapped byte.
+//
+//go:nosplit
+func mutexWaitListHead(v uintptr) muintptr {
+	if highBits := v &^ mutexMMask; highBits == 0 {
+		return 0
+	} else if m0bits := muintptr(unsafe.Pointer(&m0)); highBits == uintptr(m0bits)&^mutexMMask {
+		return m0bits
+	} else {
+		return muintptr(highBits + mutexMOffset)
+	}
+}
+
+// mutexPreferLowLatency reports if this mutex prefers low latency at the risk
+// of performance collapse. If so, we can allow all waiting threads to spin on
+// the state word rather than go to sleep.
+//
+// TODO: We could have the waiting Ms each spin on their own private cache line,
+// especially if we can put a bound on the on-CPU time that would consume.
+//
+// TODO: If there's a small set of mutex values with special requirements, they
+// could make use of a more specialized lock2/unlock2 implementation. Otherwise,
+// we're constrained to what we can fit within a single uintptr with no
+// additional storage on the M for each lock held.
+//
+//go:nosplit
+func mutexPreferLowLatency(l *mutex) bool {
+	switch l {
+	default:
+		return false
+	case &sched.lock:
+		// We often expect sched.lock to pass quickly between Ms in a way that
+		// each M has unique work to do: for instance when we stop-the-world
+		// (bringing each P to idle) or add new netpoller-triggered work to the
+		// global run queue.
+		return true
+	}
+}
+
+func mutexContended(l *mutex) bool {
+	return atomic.Loaduintptr(&l.key) > mutexLocked
+}
+
+func lock(l *mutex) {
+	lockWithRank(l, getLockRank(l))
+}
+
+func lock2(l *mutex) {
+	gp := getg()
+	if gp.m.locks < 0 {
+		throw("runtime·lock: lock count")
+	}
+	gp.m.locks++
+
+	k8 := key8(&l.key)
+
+	// Speculative grab for lock.
+	v8 := atomic.Xchg8(k8, mutexLocked)
+	if v8&mutexLocked == 0 {
+		if v8&mutexSleeping != 0 {
+			atomic.Or8(k8, mutexSleeping)
+		}
+		return
+	}
+	semacreate(gp.m)
+
+	timer := &lockTimer{lock: l}
+	timer.begin()
+	// On uniprocessors, no point spinning.
+	// On multiprocessors, spin for mutexActiveSpinCount attempts.
+	spin := 0
+	if ncpu > 1 {
+		spin = mutexActiveSpinCount
+	}
+
+	var weSpin, atTail bool
+	v := atomic.Loaduintptr(&l.key)
+tryAcquire:
+	for i := 0; ; i++ {
+		if v&mutexLocked == 0 {
+			if weSpin {
+				next := (v &^ mutexSpinning) | mutexSleeping | mutexLocked
+				if next&^mutexMMask == 0 {
+					// The fast-path Xchg8 may have cleared mutexSleeping. Fix
+					// the hint so unlock2 knows when to use its slow path.
+					next = next &^ mutexSleeping
+				}
+				if atomic.Casuintptr(&l.key, v, next) {
+					timer.end()
+					return
+				}
+			} else {
+				prev8 := atomic.Xchg8(k8, mutexLocked|mutexSleeping)
+				if prev8&mutexLocked == 0 {
+					timer.end()
+					return
+				}
+			}
+			v = atomic.Loaduintptr(&l.key)
+			continue tryAcquire
+		}
+
+		if !weSpin && v&mutexSpinning == 0 && atomic.Casuintptr(&l.key, v, v|mutexSpinning) {
+			v |= mutexSpinning
+			weSpin = true
+		}
+
+		if weSpin || atTail || mutexPreferLowLatency(l) {
+			if i < spin {
+				procyield(mutexActiveSpinSize)
+				v = atomic.Loaduintptr(&l.key)
+				continue tryAcquire
+			} else if i < spin+mutexPassiveSpinCount {
+				osyield() // TODO: Consider removing this step. See https://go.dev/issue/69268.
+				v = atomic.Loaduintptr(&l.key)
+				continue tryAcquire
+			}
+		}
+
+		// Go to sleep
+		if v&mutexLocked == 0 {
+			throw("runtime·lock: sleeping while lock is available")
+		}
+
+		// Store the current head of the list of sleeping Ms in our gp.m.mWaitList.next field
+		gp.m.mWaitList.next = mutexWaitListHead(v)
+
+		// Pack a (partial) pointer to this M with the current lock state bits
+		next := (uintptr(unsafe.Pointer(gp.m)) &^ mutexMMask) | v&mutexMMask | mutexSleeping
+		if weSpin { // If we were spinning, prepare to retire
+			next = next &^ mutexSpinning
+		}
+
+		if atomic.Casuintptr(&l.key, v, next) {
+			weSpin = false
+			// We've pushed ourselves onto the stack of waiters. Wait.
+			semasleep(-1)
+			atTail = gp.m.mWaitList.next == 0 // we were at risk of starving
+			i = 0
+		}
+
+		gp.m.mWaitList.next = 0
+		v = atomic.Loaduintptr(&l.key)
+	}
+}
+
+func unlock(l *mutex) {
+	unlockWithRank(l)
+}
+
+// We might not be holding a p in this code.
+//
+//go:nowritebarrier
+func unlock2(l *mutex) {
+	gp := getg()
+
+	prev8 := atomic.Xchg8(key8(&l.key), 0)
+	if prev8&mutexLocked == 0 {
+		throw("unlock of unlocked lock")
+	}
+
+	if prev8&mutexSleeping != 0 {
+		unlock2Wake(l)
+	}
+
+	gp.m.mLockProfile.recordUnlock(l)
+	gp.m.locks--
+	if gp.m.locks < 0 {
+		throw("runtime·unlock: lock count")
+	}
+	if gp.m.locks == 0 && gp.preempt { // restore the preemption request in case we've cleared it in newstack
+		gp.stackguard0 = stackPreempt
+	}
+}
+
+// unlock2Wake updates the list of Ms waiting on l, waking an M if necessary.
+//
+//go:nowritebarrier
+func unlock2Wake(l *mutex) {
+	v := atomic.Loaduintptr(&l.key)
+
+	// On occasion, seek out and wake the M at the bottom of the stack so it
+	// doesn't starve.
+	antiStarve := cheaprandn(mutexTailWakePeriod) == 0
+	if !(antiStarve || // avoiding starvation may require a wake
+		v&mutexSpinning == 0 || // no spinners means we must wake
+		mutexPreferLowLatency(l)) { // prefer waiters be awake as much as possible
+		return
+	}
+
+	for {
+		if v&^mutexMMask == 0 || v&mutexStackLocked != 0 {
+			// No waiting Ms means nothing to do.
+			//
+			// If the stack lock is unavailable, its owner would make the same
+			// wake decisions that we would, so there's nothing for us to do.
+			//
+			// Although: This thread may have a different call stack, which
+			// would result in a different entry in the mutex contention profile
+			// (upon completion of go.dev/issue/66999). That could lead to weird
+			// results if a slow critical section ends but another thread
+			// quickly takes the lock, finishes its own critical section,
+			// releases the lock, and then grabs the stack lock. That quick
+			// thread would then take credit (blame) for the delay that this
+			// slow thread caused. The alternative is to have more expensive
+			// atomic operations (a CAS) on the critical path of unlock2.
+			return
+		}
+		// Other M's are waiting for the lock.
+		// Obtain the stack lock, and pop off an M.
+		next := v | mutexStackLocked
+		if atomic.Casuintptr(&l.key, v, next) {
+			break
+		}
+		v = atomic.Loaduintptr(&l.key)
+	}
+
+	// We own the mutexStackLocked flag. New Ms may push themselves onto the
+	// stack concurrently, but we're now the only thread that can remove or
+	// modify the Ms that are sleeping in the list.
+
+	var committed *m // If we choose an M within the stack, we've made a promise to wake it
+	for {
+		headM := v &^ mutexMMask
+		flags := v & (mutexMMask &^ mutexStackLocked) // preserve low bits, but release stack lock
+
+		mp := mutexWaitListHead(v).ptr()
+		wakem := committed
+		if committed == nil {
+			if v&mutexSpinning == 0 || mutexPreferLowLatency(l) {
+				wakem = mp
+			}
+			if antiStarve {
+				// Wake the M at the bottom of the stack of waiters. (This is
+				// O(N) with the number of waiters.)
+				wakem = mp
+				prev := mp
+				for {
+					next := wakem.mWaitList.next.ptr()
+					if next == nil {
+						break
+					}
+					prev, wakem = wakem, next
+				}
+				if wakem != mp {
+					prev.mWaitList.next = wakem.mWaitList.next
+					committed = wakem
+				}
+			}
+		}
+
+		if wakem == mp {
+			headM = uintptr(mp.mWaitList.next) &^ mutexMMask
+		}
+
+		next := headM | flags
+		if atomic.Casuintptr(&l.key, v, next) {
+			if wakem != nil {
+				// Claimed an M. Wake it.
+				semawakeup(wakem)
+			}
+			break
+		}
+
+		v = atomic.Loaduintptr(&l.key)
+	}
+}
diff --git a/src/runtime/lock_wasip1.go b/src/runtime/lock_wasip1.go
index acfc62ac..55153c3a 100644
--- a/src/runtime/lock_wasip1.go
+++ b/src/runtime/lock_wasip1.go
@@ -19,6 +19,10 @@ const (
 	active_spin_cnt = 30
 )
 
+type mWaitList struct{}
+
+func lockVerifyMSize() {}
+
 func mutexContended(l *mutex) bool {
 	return false
 }
diff --git a/src/runtime/lockrank.go b/src/runtime/lockrank.go
index 37383833..7a5a6185 100644
--- a/src/runtime/lockrank.go
+++ b/src/runtime/lockrank.go
@@ -43,6 +43,7 @@ const (
 	lockRankRoot
 	lockRankItab
 	lockRankReflectOffs
+	lockRankSynctest
 	lockRankUserArenaState
 	// TRACEGLOBAL
 	lockRankTraceBuf
@@ -116,6 +117,7 @@ var lockNames = []string{
 	lockRankRoot:                "root",
 	lockRankItab:                "itab",
 	lockRankReflectOffs:         "reflectOffs",
+	lockRankSynctest:            "synctest",
 	lockRankUserArenaState:      "userArenaState",
 	lockRankTraceBuf:            "traceBuf",
 	lockRankTraceStrings:        "traceStrings",
@@ -196,6 +198,7 @@ var lockPartialOrder [][]lockRank = [][]lockRank{
 	lockRankRoot:                {},
 	lockRankItab:                {},
 	lockRankReflectOffs:         {lockRankItab},
+	lockRankSynctest:            {lockRankSysmon, lockRankScavenge, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankNotifyList, lockRankTimers, lockRankTimer, lockRankRoot, lockRankItab, lockRankReflectOffs},
 	lockRankUserArenaState:      {},
 	lockRankTraceBuf:            {lockRankSysmon, lockRankScavenge},
 	lockRankTraceStrings:        {lockRankSysmon, lockRankScavenge, lockRankTraceBuf},
@@ -208,16 +211,16 @@ var lockPartialOrder [][]lockRank = [][]lockRank{
 	lockRankProfBlock:           {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankTimers, lockRankTimer, lockRankItab, lockRankReflectOffs, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings},
 	lockRankProfMemActive:       {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankTimers, lockRankTimer, lockRankItab, lockRankReflectOffs, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings},
 	lockRankProfMemFuture:       {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankTimers, lockRankTimer, lockRankItab, lockRankReflectOffs, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankProfMemActive},
-	lockRankGscan:               {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankTimers, lockRankTimer, lockRankNetpollInit, lockRankRoot, lockRankItab, lockRankReflectOffs, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankFin, lockRankSpanSetSpine, lockRankMspanSpecial, lockRankGcBitsArenas, lockRankProfInsert, lockRankProfBlock, lockRankProfMemActive, lockRankProfMemFuture},
-	lockRankStackpool:           {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankTimers, lockRankTimer, lockRankNetpollInit, lockRankRoot, lockRankItab, lockRankReflectOffs, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankFin, lockRankSpanSetSpine, lockRankMspanSpecial, lockRankGcBitsArenas, lockRankProfInsert, lockRankProfBlock, lockRankProfMemActive, lockRankProfMemFuture, lockRankGscan},
-	lockRankStackLarge:          {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankTimers, lockRankTimer, lockRankNetpollInit, lockRankRoot, lockRankItab, lockRankReflectOffs, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankFin, lockRankSpanSetSpine, lockRankMspanSpecial, lockRankGcBitsArenas, lockRankProfInsert, lockRankProfBlock, lockRankProfMemActive, lockRankProfMemFuture, lockRankGscan},
-	lockRankHchanLeaf:           {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankTimers, lockRankTimer, lockRankNetpollInit, lockRankRoot, lockRankItab, lockRankReflectOffs, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankFin, lockRankSpanSetSpine, lockRankMspanSpecial, lockRankGcBitsArenas, lockRankProfInsert, lockRankProfBlock, lockRankProfMemActive, lockRankProfMemFuture, lockRankGscan, lockRankHchanLeaf},
-	lockRankWbufSpans:           {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankDefer, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollCache, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankSudog, lockRankTimers, lockRankTimer, lockRankNetpollInit, lockRankRoot, lockRankItab, lockRankReflectOffs, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankFin, lockRankSpanSetSpine, lockRankMspanSpecial, lockRankGcBitsArenas, lockRankProfInsert, lockRankProfBlock, lockRankProfMemActive, lockRankProfMemFuture, lockRankGscan},
-	lockRankMheap:               {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankDefer, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollCache, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankSudog, lockRankTimers, lockRankTimer, lockRankNetpollInit, lockRankRoot, lockRankItab, lockRankReflectOffs, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankFin, lockRankSpanSetSpine, lockRankMspanSpecial, lockRankGcBitsArenas, lockRankProfInsert, lockRankProfBlock, lockRankProfMemActive, lockRankProfMemFuture, lockRankGscan, lockRankStackpool, lockRankStackLarge, lockRankWbufSpans},
-	lockRankMheapSpecial:        {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankDefer, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollCache, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankSudog, lockRankTimers, lockRankTimer, lockRankNetpollInit, lockRankRoot, lockRankItab, lockRankReflectOffs, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankFin, lockRankSpanSetSpine, lockRankMspanSpecial, lockRankGcBitsArenas, lockRankProfInsert, lockRankProfBlock, lockRankProfMemActive, lockRankProfMemFuture, lockRankGscan, lockRankStackpool, lockRankStackLarge, lockRankWbufSpans, lockRankMheap},
-	lockRankGlobalAlloc:         {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankDefer, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollCache, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankSudog, lockRankTimers, lockRankTimer, lockRankNetpollInit, lockRankRoot, lockRankItab, lockRankReflectOffs, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankFin, lockRankSpanSetSpine, lockRankMspanSpecial, lockRankGcBitsArenas, lockRankProfInsert, lockRankProfBlock, lockRankProfMemActive, lockRankProfMemFuture, lockRankGscan, lockRankStackpool, lockRankStackLarge, lockRankWbufSpans, lockRankMheap, lockRankMheapSpecial},
-	lockRankTrace:               {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankDefer, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollCache, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankSudog, lockRankTimers, lockRankTimer, lockRankNetpollInit, lockRankRoot, lockRankItab, lockRankReflectOffs, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankFin, lockRankSpanSetSpine, lockRankMspanSpecial, lockRankGcBitsArenas, lockRankProfInsert, lockRankProfBlock, lockRankProfMemActive, lockRankProfMemFuture, lockRankGscan, lockRankStackpool, lockRankStackLarge, lockRankWbufSpans, lockRankMheap},
-	lockRankTraceStackTab:       {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankDefer, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollCache, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankSudog, lockRankTimers, lockRankTimer, lockRankNetpollInit, lockRankRoot, lockRankItab, lockRankReflectOffs, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankFin, lockRankSpanSetSpine, lockRankMspanSpecial, lockRankGcBitsArenas, lockRankProfInsert, lockRankProfBlock, lockRankProfMemActive, lockRankProfMemFuture, lockRankGscan, lockRankStackpool, lockRankStackLarge, lockRankWbufSpans, lockRankMheap, lockRankTrace},
+	lockRankGscan:               {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankTimers, lockRankTimer, lockRankNetpollInit, lockRankRoot, lockRankItab, lockRankReflectOffs, lockRankSynctest, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankFin, lockRankSpanSetSpine, lockRankMspanSpecial, lockRankGcBitsArenas, lockRankProfInsert, lockRankProfBlock, lockRankProfMemActive, lockRankProfMemFuture},
+	lockRankStackpool:           {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankTimers, lockRankTimer, lockRankNetpollInit, lockRankRoot, lockRankItab, lockRankReflectOffs, lockRankSynctest, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankFin, lockRankSpanSetSpine, lockRankMspanSpecial, lockRankGcBitsArenas, lockRankProfInsert, lockRankProfBlock, lockRankProfMemActive, lockRankProfMemFuture, lockRankGscan},
+	lockRankStackLarge:          {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankTimers, lockRankTimer, lockRankNetpollInit, lockRankRoot, lockRankItab, lockRankReflectOffs, lockRankSynctest, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankFin, lockRankSpanSetSpine, lockRankMspanSpecial, lockRankGcBitsArenas, lockRankProfInsert, lockRankProfBlock, lockRankProfMemActive, lockRankProfMemFuture, lockRankGscan},
+	lockRankHchanLeaf:           {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankTimers, lockRankTimer, lockRankNetpollInit, lockRankRoot, lockRankItab, lockRankReflectOffs, lockRankSynctest, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankFin, lockRankSpanSetSpine, lockRankMspanSpecial, lockRankGcBitsArenas, lockRankProfInsert, lockRankProfBlock, lockRankProfMemActive, lockRankProfMemFuture, lockRankGscan, lockRankHchanLeaf},
+	lockRankWbufSpans:           {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankDefer, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollCache, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankSudog, lockRankTimers, lockRankTimer, lockRankNetpollInit, lockRankRoot, lockRankItab, lockRankReflectOffs, lockRankSynctest, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankFin, lockRankSpanSetSpine, lockRankMspanSpecial, lockRankGcBitsArenas, lockRankProfInsert, lockRankProfBlock, lockRankProfMemActive, lockRankProfMemFuture, lockRankGscan},
+	lockRankMheap:               {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankDefer, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollCache, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankSudog, lockRankTimers, lockRankTimer, lockRankNetpollInit, lockRankRoot, lockRankItab, lockRankReflectOffs, lockRankSynctest, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankFin, lockRankSpanSetSpine, lockRankMspanSpecial, lockRankGcBitsArenas, lockRankProfInsert, lockRankProfBlock, lockRankProfMemActive, lockRankProfMemFuture, lockRankGscan, lockRankStackpool, lockRankStackLarge, lockRankWbufSpans},
+	lockRankMheapSpecial:        {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankDefer, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollCache, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankSudog, lockRankTimers, lockRankTimer, lockRankNetpollInit, lockRankRoot, lockRankItab, lockRankReflectOffs, lockRankSynctest, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankFin, lockRankSpanSetSpine, lockRankMspanSpecial, lockRankGcBitsArenas, lockRankProfInsert, lockRankProfBlock, lockRankProfMemActive, lockRankProfMemFuture, lockRankGscan, lockRankStackpool, lockRankStackLarge, lockRankWbufSpans, lockRankMheap},
+	lockRankGlobalAlloc:         {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankDefer, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollCache, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankSudog, lockRankTimers, lockRankTimer, lockRankNetpollInit, lockRankRoot, lockRankItab, lockRankReflectOffs, lockRankSynctest, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankFin, lockRankSpanSetSpine, lockRankMspanSpecial, lockRankGcBitsArenas, lockRankProfInsert, lockRankProfBlock, lockRankProfMemActive, lockRankProfMemFuture, lockRankGscan, lockRankStackpool, lockRankStackLarge, lockRankWbufSpans, lockRankMheap, lockRankMheapSpecial},
+	lockRankTrace:               {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankDefer, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollCache, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankSudog, lockRankTimers, lockRankTimer, lockRankNetpollInit, lockRankRoot, lockRankItab, lockRankReflectOffs, lockRankSynctest, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankFin, lockRankSpanSetSpine, lockRankMspanSpecial, lockRankGcBitsArenas, lockRankProfInsert, lockRankProfBlock, lockRankProfMemActive, lockRankProfMemFuture, lockRankGscan, lockRankStackpool, lockRankStackLarge, lockRankWbufSpans, lockRankMheap},
+	lockRankTraceStackTab:       {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankDefer, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollCache, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankSudog, lockRankTimers, lockRankTimer, lockRankNetpollInit, lockRankRoot, lockRankItab, lockRankReflectOffs, lockRankSynctest, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankFin, lockRankSpanSetSpine, lockRankMspanSpecial, lockRankGcBitsArenas, lockRankProfInsert, lockRankProfBlock, lockRankProfMemActive, lockRankProfMemFuture, lockRankGscan, lockRankStackpool, lockRankStackLarge, lockRankWbufSpans, lockRankMheap, lockRankTrace},
 	lockRankPanic:               {},
 	lockRankDeadlock:            {lockRankPanic, lockRankDeadlock},
 	lockRankRaceFini:            {lockRankPanic},
diff --git a/src/runtime/malloc.go b/src/runtime/malloc.go
index b92a2132..73d663f7 100644
--- a/src/runtime/malloc.go
+++ b/src/runtime/malloc.go
@@ -104,8 +104,8 @@ import (
 	"internal/goarch"
 	"internal/goos"
 	"internal/runtime/atomic"
-	"runtime/internal/math"
-	"runtime/internal/sys"
+	"internal/runtime/math"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
@@ -227,7 +227,7 @@ const (
 	// --------------  ---------  ----------  ----------  -----------
 	//       */64-bit         48        64MB           1    4M (32MB)
 	// windows/64-bit         48         4MB          64    1M  (8MB)
-	//      ios/arm64         33         4MB           1  2048  (8KB)
+	//      ios/arm64         40         4MB           1  256K  (2MB)
 	//       */32-bit         32         4MB           1  1024  (4KB)
 	//     */mips(le)         31         4MB           1   512  (2KB)
 
@@ -427,8 +427,15 @@ func mallocinit() {
 	// Check that the minimum size (exclusive) for a malloc header is also
 	// a size class boundary. This is important to making sure checks align
 	// across different parts of the runtime.
+	//
+	// While we're here, also check to make sure all these size classes'
+	// span sizes are one page. Some code relies on this.
 	minSizeForMallocHeaderIsSizeClass := false
+	sizeClassesUpToMinSizeForMallocHeaderAreOnePage := true
 	for i := 0; i < len(class_to_size); i++ {
+		if class_to_allocnpages[i] > 1 {
+			sizeClassesUpToMinSizeForMallocHeaderAreOnePage = false
+		}
 		if minSizeForMallocHeader == uintptr(class_to_size[i]) {
 			minSizeForMallocHeaderIsSizeClass = true
 			break
@@ -437,6 +444,9 @@ func mallocinit() {
 	if !minSizeForMallocHeaderIsSizeClass {
 		throw("min size of malloc header is not a size class boundary")
 	}
+	if !sizeClassesUpToMinSizeForMallocHeaderAreOnePage {
+		throw("expected all size classes up to min size for malloc header to fit in one-page spans")
+	}
 	// Check that the pointer bitmap for all small sizes without a malloc header
 	// fits in a word.
 	if minSizeForMallocHeader/goarch.PtrSize > 8*goarch.PtrSize {
@@ -444,7 +454,7 @@ func mallocinit() {
 	}
 
 	if minTagBits > taggedPointerBits {
-		throw("taggedPointerbits too small")
+		throw("taggedPointerBits too small")
 	}
 
 	// Initialize the heap.
@@ -460,7 +470,10 @@ func mallocinit() {
 	lockInit(&globalAlloc.mutex, lockRankGlobalAlloc)
 
 	// Create initial arena growth hints.
-	if goarch.PtrSize == 8 {
+	if isSbrkPlatform {
+		// Don't generate hints on sbrk platforms. We can
+		// only grow the break sequentially.
+	} else if goarch.PtrSize == 8 {
 		// On a 64-bit machine, we pick the following hints
 		// because:
 		//
@@ -818,6 +831,12 @@ mapped:
 // aligned to align bytes. It may reserve either n or n+align bytes,
 // so it returns the size that was reserved.
 func sysReserveAligned(v unsafe.Pointer, size, align uintptr) (unsafe.Pointer, uintptr) {
+	if isSbrkPlatform {
+		if v != nil {
+			throw("unexpected heap arena hint on sbrk platform")
+		}
+		return sysReserveAlignedSbrk(size, align)
+	}
 	// Since the alignment is rather large in uses of this
 	// function, we're not likely to get it by chance, so we ask
 	// for a larger region and remove the parts we don't need.
@@ -932,9 +951,9 @@ func nextFreeFast(s *mspan) gclinkptr {
 //
 // Must run in a non-preemptible context since otherwise the owner of
 // c could change.
-func (c *mcache) nextFree(spc spanClass) (v gclinkptr, s *mspan, shouldhelpgc bool) {
+func (c *mcache) nextFree(spc spanClass) (v gclinkptr, s *mspan, checkGCTrigger bool) {
 	s = c.alloc[spc]
-	shouldhelpgc = false
+	checkGCTrigger = false
 	freeIndex := s.nextFreeIndex()
 	if freeIndex == s.nelems {
 		// The span is full.
@@ -943,7 +962,7 @@ func (c *mcache) nextFree(spc spanClass) (v gclinkptr, s *mspan, shouldhelpgc bo
 			throw("s.allocCount != s.nelems && freeIndex == s.nelems")
 		}
 		c.refill(spc)
-		shouldhelpgc = true
+		checkGCTrigger = true
 		s = c.alloc[spc]
 
 		freeIndex = s.nextFreeIndex()
@@ -962,6 +981,14 @@ func (c *mcache) nextFree(spc spanClass) (v gclinkptr, s *mspan, shouldhelpgc bo
 	return
 }
 
+// doubleCheckMalloc enables a bunch of extra checks to malloc to double-check
+// that various invariants are upheld.
+//
+// We might consider turning these on by default; many of them previously were.
+// They account for a few % of mallocgc's cost though, which does matter somewhat
+// at scale.
+const doubleCheckMalloc = false
+
 // Allocate an object of size bytes.
 // Small objects are allocated from the per-P cache's free lists.
 // Large objects (> 32 kB) are allocated straight from the heap.
@@ -981,215 +1008,181 @@ func (c *mcache) nextFree(spc spanClass) (v gclinkptr, s *mspan, shouldhelpgc bo
 //
 //go:linkname mallocgc
 func mallocgc(size uintptr, typ *_type, needzero bool) unsafe.Pointer {
-	if gcphase == _GCmarktermination {
-		throw("mallocgc called with gcphase == _GCmarktermination")
+	if doubleCheckMalloc {
+		if gcphase == _GCmarktermination {
+			throw("mallocgc called with gcphase == _GCmarktermination")
+		}
 	}
 
+	// Short-circuit zero-sized allocation requests.
 	if size == 0 {
 		return unsafe.Pointer(&zerobase)
 	}
 
 	// It's possible for any malloc to trigger sweeping, which may in
 	// turn queue finalizers. Record this dynamic lock edge.
+	// N.B. Compiled away if lockrank experiment is not enabled.
 	lockRankMayQueueFinalizer()
 
-	userSize := size
-	if asanenabled {
-		// Refer to ASAN runtime library, the malloc() function allocates extra memory,
-		// the redzone, around the user requested memory region. And the redzones are marked
-		// as unaddressable. We perform the same operations in Go to detect the overflows or
-		// underflows.
-		size += computeRZlog(size)
-	}
-
+	// Pre-malloc debug hooks.
 	if debug.malloc {
-		if debug.sbrk != 0 {
-			align := uintptr(16)
-			if typ != nil {
-				// TODO(austin): This should be just
-				//   align = uintptr(typ.align)
-				// but that's only 4 on 32-bit platforms,
-				// even if there's a uint64 field in typ (see #599).
-				// This causes 64-bit atomic accesses to panic.
-				// Hence, we use stricter alignment that matches
-				// the normal allocator better.
-				if size&7 == 0 {
-					align = 8
-				} else if size&3 == 0 {
-					align = 4
-				} else if size&1 == 0 {
-					align = 2
-				} else {
-					align = 1
-				}
-			}
-			return persistentalloc(size, align, &memstats.other_sys)
-		}
-
-		if inittrace.active && inittrace.id == getg().goid {
-			// Init functions are executed sequentially in a single goroutine.
-			inittrace.allocs += 1
+		if x := preMallocgcDebug(size, typ); x != nil {
+			return x
 		}
 	}
 
-	// assistG is the G to charge for this allocation, or nil if
-	// GC is not currently active.
-	assistG := deductAssistCredit(size)
+	// For ASAN, we allocate extra memory around each allocation called the "redzone."
+	// These "redzones" are marked as unaddressable.
+	var asanRZ uintptr
+	if asanenabled {
+		asanRZ = redZoneSize(size)
+		size += asanRZ
+	}
 
+	// Assist the GC if needed.
+	if gcBlackenEnabled != 0 {
+		deductAssistCredit(size)
+	}
+
+	// Actually do the allocation.
+	var x unsafe.Pointer
+	var elemsize uintptr
+	if size <= maxSmallSize-mallocHeaderSize {
+		if typ == nil || !typ.Pointers() {
+			if size < maxTinySize {
+				x, elemsize = mallocgcTiny(size, typ, needzero)
+			} else {
+				x, elemsize = mallocgcSmallNoscan(size, typ, needzero)
+			}
+		} else if heapBitsInSpan(size) {
+			x, elemsize = mallocgcSmallScanNoHeader(size, typ, needzero)
+		} else {
+			x, elemsize = mallocgcSmallScanHeader(size, typ, needzero)
+		}
+	} else {
+		x, elemsize = mallocgcLarge(size, typ, needzero)
+	}
+
+	// Notify sanitizers, if enabled.
+	if raceenabled {
+		racemalloc(x, size-asanRZ)
+	}
+	if msanenabled {
+		msanmalloc(x, size-asanRZ)
+	}
+	if asanenabled {
+		// Poison the space between the end of the requested size of x
+		// and the end of the slot. Unpoison the requested allocation.
+		frag := elemsize - size
+		if typ != nil && typ.Pointers() && !heapBitsInSpan(elemsize) && size <= maxSmallSize-mallocHeaderSize {
+			frag -= mallocHeaderSize
+		}
+		asanpoison(unsafe.Add(x, size-asanRZ), asanRZ)
+		asanunpoison(x, size-asanRZ)
+	}
+
+	// Adjust our GC assist debt to account for internal fragmentation.
+	if gcBlackenEnabled != 0 && elemsize != 0 {
+		if assistG := getg().m.curg; assistG != nil {
+			assistG.gcAssistBytes -= int64(elemsize - size)
+		}
+	}
+
+	// Post-malloc debug hooks.
+	if debug.malloc {
+		postMallocgcDebug(x, elemsize, typ)
+	}
+	return x
+}
+
+func mallocgcTiny(size uintptr, typ *_type, needzero bool) (unsafe.Pointer, uintptr) {
 	// Set mp.mallocing to keep from being preempted by GC.
 	mp := acquirem()
-	if mp.mallocing != 0 {
-		throw("malloc deadlock")
-	}
-	if mp.gsignal == getg() {
-		throw("malloc during signal")
+	if doubleCheckMalloc {
+		if mp.mallocing != 0 {
+			throw("malloc deadlock")
+		}
+		if mp.gsignal == getg() {
+			throw("malloc during signal")
+		}
+		if typ != nil && typ.Pointers() {
+			throw("expected noscan for tiny alloc")
+		}
 	}
 	mp.mallocing = 1
 
-	shouldhelpgc := false
-	dataSize := userSize
-	c := getMCache(mp)
-	if c == nil {
-		throw("mallocgc called without a P or outside bootstrapping")
-	}
-	var span *mspan
-	var header **_type
-	var x unsafe.Pointer
-	noscan := typ == nil || !typ.Pointers()
-	// In some cases block zeroing can profitably (for latency reduction purposes)
-	// be delayed till preemption is possible; delayedZeroing tracks that state.
-	delayedZeroing := false
-	// Determine if it's a 'small' object that goes into a size-classed span.
+	// Tiny allocator.
 	//
-	// Note: This comparison looks a little strange, but it exists to smooth out
-	// the crossover between the largest size class and large objects that have
-	// their own spans. The small window of object sizes between maxSmallSize-mallocHeaderSize
-	// and maxSmallSize will be considered large, even though they might fit in
-	// a size class. In practice this is completely fine, since the largest small
-	// size class has a single object in it already, precisely to make the transition
-	// to large objects smooth.
-	if size <= maxSmallSize-mallocHeaderSize {
-		if noscan && size < maxTinySize {
-			// Tiny allocator.
-			//
-			// Tiny allocator combines several tiny allocation requests
-			// into a single memory block. The resulting memory block
-			// is freed when all subobjects are unreachable. The subobjects
-			// must be noscan (don't have pointers), this ensures that
-			// the amount of potentially wasted memory is bounded.
-			//
-			// Size of the memory block used for combining (maxTinySize) is tunable.
-			// Current setting is 16 bytes, which relates to 2x worst case memory
-			// wastage (when all but one subobjects are unreachable).
-			// 8 bytes would result in no wastage at all, but provides less
-			// opportunities for combining.
-			// 32 bytes provides more opportunities for combining,
-			// but can lead to 4x worst case wastage.
-			// The best case winning is 8x regardless of block size.
-			//
-			// Objects obtained from tiny allocator must not be freed explicitly.
-			// So when an object will be freed explicitly, we ensure that
-			// its size >= maxTinySize.
-			//
-			// SetFinalizer has a special case for objects potentially coming
-			// from tiny allocator, it such case it allows to set finalizers
-			// for an inner byte of a memory block.
-			//
-			// The main targets of tiny allocator are small strings and
-			// standalone escaping variables. On a json benchmark
-			// the allocator reduces number of allocations by ~12% and
-			// reduces heap size by ~20%.
-			off := c.tinyoffset
-			// Align tiny pointer for required (conservative) alignment.
-			if size&7 == 0 {
-				off = alignUp(off, 8)
-			} else if goarch.PtrSize == 4 && size == 12 {
-				// Conservatively align 12-byte objects to 8 bytes on 32-bit
-				// systems so that objects whose first field is a 64-bit
-				// value is aligned to 8 bytes and does not cause a fault on
-				// atomic access. See issue 37262.
-				// TODO(mknyszek): Remove this workaround if/when issue 36606
-				// is resolved.
-				off = alignUp(off, 8)
-			} else if size&3 == 0 {
-				off = alignUp(off, 4)
-			} else if size&1 == 0 {
-				off = alignUp(off, 2)
-			}
-			if off+size <= maxTinySize && c.tiny != 0 {
-				// The object fits into existing tiny block.
-				x = unsafe.Pointer(c.tiny + off)
-				c.tinyoffset = off + size
-				c.tinyAllocs++
-				mp.mallocing = 0
-				releasem(mp)
-				return x
-			}
-			// Allocate a new maxTinySize block.
-			span = c.alloc[tinySpanClass]
-			v := nextFreeFast(span)
-			if v == 0 {
-				v, span, shouldhelpgc = c.nextFree(tinySpanClass)
-			}
-			x = unsafe.Pointer(v)
-			(*[2]uint64)(x)[0] = 0
-			(*[2]uint64)(x)[1] = 0
-			// See if we need to replace the existing tiny block with the new one
-			// based on amount of remaining free space.
-			if !raceenabled && (size < c.tinyoffset || c.tiny == 0) {
-				// Note: disabled when race detector is on, see comment near end of this function.
-				c.tiny = uintptr(x)
-				c.tinyoffset = size
-			}
-			size = maxTinySize
-		} else {
-			hasHeader := !noscan && !heapBitsInSpan(size)
-			if hasHeader {
-				size += mallocHeaderSize
-			}
-			var sizeclass uint8
-			if size <= smallSizeMax-8 {
-				sizeclass = size_to_class8[divRoundUp(size, smallSizeDiv)]
-			} else {
-				sizeclass = size_to_class128[divRoundUp(size-smallSizeMax, largeSizeDiv)]
-			}
-			size = uintptr(class_to_size[sizeclass])
-			spc := makeSpanClass(sizeclass, noscan)
-			span = c.alloc[spc]
-			v := nextFreeFast(span)
-			if v == 0 {
-				v, span, shouldhelpgc = c.nextFree(spc)
-			}
-			x = unsafe.Pointer(v)
-			if needzero && span.needzero != 0 {
-				memclrNoHeapPointers(x, size)
-			}
-			if hasHeader {
-				header = (**_type)(x)
-				x = add(x, mallocHeaderSize)
-				size -= mallocHeaderSize
-			}
-		}
-	} else {
-		shouldhelpgc = true
-		// For large allocations, keep track of zeroed state so that
-		// bulk zeroing can be happen later in a preemptible context.
-		span = c.allocLarge(size, noscan)
-		span.freeindex = 1
-		span.allocCount = 1
-		size = span.elemsize
-		x = unsafe.Pointer(span.base())
-		if needzero && span.needzero != 0 {
-			delayedZeroing = true
-		}
-		if !noscan {
-			// Tell the GC not to look at this yet.
-			span.largeType = nil
-			header = &span.largeType
-		}
+	// Tiny allocator combines several tiny allocation requests
+	// into a single memory block. The resulting memory block
+	// is freed when all subobjects are unreachable. The subobjects
+	// must be noscan (don't have pointers), this ensures that
+	// the amount of potentially wasted memory is bounded.
+	//
+	// Size of the memory block used for combining (maxTinySize) is tunable.
+	// Current setting is 16 bytes, which relates to 2x worst case memory
+	// wastage (when all but one subobjects are unreachable).
+	// 8 bytes would result in no wastage at all, but provides less
+	// opportunities for combining.
+	// 32 bytes provides more opportunities for combining,
+	// but can lead to 4x worst case wastage.
+	// The best case winning is 8x regardless of block size.
+	//
+	// Objects obtained from tiny allocator must not be freed explicitly.
+	// So when an object will be freed explicitly, we ensure that
+	// its size >= maxTinySize.
+	//
+	// SetFinalizer has a special case for objects potentially coming
+	// from tiny allocator, it such case it allows to set finalizers
+	// for an inner byte of a memory block.
+	//
+	// The main targets of tiny allocator are small strings and
+	// standalone escaping variables. On a json benchmark
+	// the allocator reduces number of allocations by ~12% and
+	// reduces heap size by ~20%.
+	c := getMCache(mp)
+	off := c.tinyoffset
+	// Align tiny pointer for required (conservative) alignment.
+	if size&7 == 0 {
+		off = alignUp(off, 8)
+	} else if goarch.PtrSize == 4 && size == 12 {
+		// Conservatively align 12-byte objects to 8 bytes on 32-bit
+		// systems so that objects whose first field is a 64-bit
+		// value is aligned to 8 bytes and does not cause a fault on
+		// atomic access. See issue 37262.
+		// TODO(mknyszek): Remove this workaround if/when issue 36606
+		// is resolved.
+		off = alignUp(off, 8)
+	} else if size&3 == 0 {
+		off = alignUp(off, 4)
+	} else if size&1 == 0 {
+		off = alignUp(off, 2)
 	}
-	if !noscan && !delayedZeroing {
-		c.scanAlloc += heapSetType(uintptr(x), dataSize, typ, header, span)
+	if off+size <= maxTinySize && c.tiny != 0 {
+		// The object fits into existing tiny block.
+		x := unsafe.Pointer(c.tiny + off)
+		c.tinyoffset = off + size
+		c.tinyAllocs++
+		mp.mallocing = 0
+		releasem(mp)
+		return x, 0
+	}
+	// Allocate a new maxTinySize block.
+	checkGCTrigger := false
+	span := c.alloc[tinySpanClass]
+	v := nextFreeFast(span)
+	if v == 0 {
+		v, span, checkGCTrigger = c.nextFree(tinySpanClass)
+	}
+	x := unsafe.Pointer(v)
+	(*[2]uint64)(x)[0] = 0
+	(*[2]uint64)(x)[1] = 0
+	// See if we need to replace the existing tiny block with the new one
+	// based on amount of remaining free space.
+	if !raceenabled && (size < c.tinyoffset || c.tiny == 0) {
+		// Note: disabled when race detector is on, see comment near end of this function.
+		c.tiny = uintptr(x)
+		c.tinyoffset = size
 	}
 
 	// Ensure that the stores above that initialize x to
@@ -1214,98 +1207,33 @@ func mallocgc(size uintptr, typ *_type, needzero bool) unsafe.Pointer {
 	// All slots hold nil so no scanning is needed.
 	// This may be racing with GC so do it atomically if there can be
 	// a race marking the bit.
-	if gcphase != _GCoff {
+	if writeBarrier.enabled {
 		gcmarknewobject(span, uintptr(x))
 	}
 
-	if raceenabled {
-		racemalloc(x, size)
-	}
-
-	if msanenabled {
-		msanmalloc(x, size)
-	}
-
-	if asanenabled {
-		// We should only read/write the memory with the size asked by the user.
-		// The rest of the allocated memory should be poisoned, so that we can report
-		// errors when accessing poisoned memory.
-		// The allocated memory is larger than required userSize, it will also include
-		// redzone and some other padding bytes.
-		rzBeg := unsafe.Add(x, userSize)
-		asanpoison(rzBeg, size-userSize)
-		asanunpoison(x, userSize)
-	}
-
+	// Note cache c only valid while m acquired; see #47302
+	//
+	// N.B. Use the full size because that matches how the GC
+	// will update the mem profile on the "free" side.
+	//
 	// TODO(mknyszek): We should really count the header as part
 	// of gc_sys or something. The code below just pretends it is
 	// internal fragmentation and matches the GC's accounting by
 	// using the whole allocation slot.
-	fullSize := span.elemsize
-	if rate := MemProfileRate; rate > 0 {
-		// Note cache c only valid while m acquired; see #47302
-		//
-		// N.B. Use the full size because that matches how the GC
-		// will update the mem profile on the "free" side.
-		if rate != 1 && fullSize < c.nextSample {
-			c.nextSample -= fullSize
-		} else {
-			profilealloc(mp, x, fullSize)
-		}
+	c.nextSample -= int64(span.elemsize)
+	if c.nextSample < 0 || MemProfileRate != c.memProfRate {
+		profilealloc(mp, x, span.elemsize)
 	}
 	mp.mallocing = 0
 	releasem(mp)
 
-	// Objects can be zeroed late in a context where preemption can occur.
-	// If the object contains pointers, its pointer data must be cleared
-	// or otherwise indicate that the GC shouldn't scan it.
-	// x will keep the memory alive.
-	if delayedZeroing {
-		// N.B. size == fullSize always in this case.
-		memclrNoHeapPointersChunked(size, x) // This is a possible preemption point: see #47302
-
-		// Finish storing the type information for this case.
-		if !noscan {
-			mp := acquirem()
-			getMCache(mp).scanAlloc += heapSetType(uintptr(x), dataSize, typ, header, span)
-
-			// Publish the type information with the zeroed memory.
-			publicationBarrier()
-			releasem(mp)
-		}
-	}
-
-	if debug.malloc {
-		if inittrace.active && inittrace.id == getg().goid {
-			// Init functions are executed sequentially in a single goroutine.
-			inittrace.bytes += uint64(fullSize)
-		}
-
-		if traceAllocFreeEnabled() {
-			trace := traceAcquire()
-			if trace.ok() {
-				trace.HeapObjectAlloc(uintptr(x), typ)
-				traceRelease(trace)
-			}
-		}
-	}
-
-	if assistG != nil {
-		// Account for internal fragmentation in the assist
-		// debt now that we know it.
-		//
-		// N.B. Use the full size because that's how the rest
-		// of the GC accounts for bytes marked.
-		assistG.gcAssistBytes -= int64(fullSize - dataSize)
-	}
-
-	if shouldhelpgc {
+	if checkGCTrigger {
 		if t := (gcTrigger{kind: gcTriggerHeap}); t.test() {
 			gcStart(t)
 		}
 	}
 
-	if raceenabled && noscan && dataSize < maxTinySize {
+	if raceenabled {
 		// Pad tinysize allocations so they are aligned with the end
 		// of the tinyalloc region. This ensures that any arithmetic
 		// that goes off the top end of the object will be detectable
@@ -1318,10 +1246,414 @@ func mallocgc(size uintptr, typ *_type, needzero bool) unsafe.Pointer {
 		// TODO: enable this padding for all allocations, not just
 		// tinyalloc ones. It's tricky because of pointer maps.
 		// Maybe just all noscan objects?
-		x = add(x, size-dataSize)
+		x = add(x, span.elemsize-size)
+	}
+	return x, span.elemsize
+}
+
+func mallocgcSmallNoscan(size uintptr, typ *_type, needzero bool) (unsafe.Pointer, uintptr) {
+	// Set mp.mallocing to keep from being preempted by GC.
+	mp := acquirem()
+	if doubleCheckMalloc {
+		if mp.mallocing != 0 {
+			throw("malloc deadlock")
+		}
+		if mp.gsignal == getg() {
+			throw("malloc during signal")
+		}
+		if typ != nil && typ.Pointers() {
+			throw("expected noscan type for noscan alloc")
+		}
+	}
+	mp.mallocing = 1
+
+	checkGCTrigger := false
+	c := getMCache(mp)
+	var sizeclass uint8
+	if size <= smallSizeMax-8 {
+		sizeclass = size_to_class8[divRoundUp(size, smallSizeDiv)]
+	} else {
+		sizeclass = size_to_class128[divRoundUp(size-smallSizeMax, largeSizeDiv)]
+	}
+	size = uintptr(class_to_size[sizeclass])
+	spc := makeSpanClass(sizeclass, true)
+	span := c.alloc[spc]
+	v := nextFreeFast(span)
+	if v == 0 {
+		v, span, checkGCTrigger = c.nextFree(spc)
+	}
+	x := unsafe.Pointer(v)
+	if needzero && span.needzero != 0 {
+		memclrNoHeapPointers(x, size)
 	}
 
-	return x
+	// Ensure that the stores above that initialize x to
+	// type-safe memory and set the heap bits occur before
+	// the caller can make x observable to the garbage
+	// collector. Otherwise, on weakly ordered machines,
+	// the garbage collector could follow a pointer to x,
+	// but see uninitialized memory or stale heap bits.
+	publicationBarrier()
+	// As x and the heap bits are initialized, update
+	// freeIndexForScan now so x is seen by the GC
+	// (including conservative scan) as an allocated object.
+	// While this pointer can't escape into user code as a
+	// _live_ pointer until we return, conservative scanning
+	// may find a dead pointer that happens to point into this
+	// object. Delaying this update until now ensures that
+	// conservative scanning considers this pointer dead until
+	// this point.
+	span.freeIndexForScan = span.freeindex
+
+	// Allocate black during GC.
+	// All slots hold nil so no scanning is needed.
+	// This may be racing with GC so do it atomically if there can be
+	// a race marking the bit.
+	if writeBarrier.enabled {
+		gcmarknewobject(span, uintptr(x))
+	}
+
+	// Note cache c only valid while m acquired; see #47302
+	//
+	// N.B. Use the full size because that matches how the GC
+	// will update the mem profile on the "free" side.
+	//
+	// TODO(mknyszek): We should really count the header as part
+	// of gc_sys or something. The code below just pretends it is
+	// internal fragmentation and matches the GC's accounting by
+	// using the whole allocation slot.
+	c.nextSample -= int64(size)
+	if c.nextSample < 0 || MemProfileRate != c.memProfRate {
+		profilealloc(mp, x, size)
+	}
+	mp.mallocing = 0
+	releasem(mp)
+
+	if checkGCTrigger {
+		if t := (gcTrigger{kind: gcTriggerHeap}); t.test() {
+			gcStart(t)
+		}
+	}
+	return x, size
+}
+
+func mallocgcSmallScanNoHeader(size uintptr, typ *_type, needzero bool) (unsafe.Pointer, uintptr) {
+	// Set mp.mallocing to keep from being preempted by GC.
+	mp := acquirem()
+	if doubleCheckMalloc {
+		if mp.mallocing != 0 {
+			throw("malloc deadlock")
+		}
+		if mp.gsignal == getg() {
+			throw("malloc during signal")
+		}
+		if typ == nil || !typ.Pointers() {
+			throw("noscan allocated in scan-only path")
+		}
+		if !heapBitsInSpan(size) {
+			throw("heap bits in not in span for non-header-only path")
+		}
+	}
+	mp.mallocing = 1
+
+	checkGCTrigger := false
+	c := getMCache(mp)
+	sizeclass := size_to_class8[divRoundUp(size, smallSizeDiv)]
+	spc := makeSpanClass(sizeclass, false)
+	span := c.alloc[spc]
+	v := nextFreeFast(span)
+	if v == 0 {
+		v, span, checkGCTrigger = c.nextFree(spc)
+	}
+	x := unsafe.Pointer(v)
+	if needzero && span.needzero != 0 {
+		memclrNoHeapPointers(x, size)
+	}
+	if goarch.PtrSize == 8 && sizeclass == 1 {
+		// initHeapBits already set the pointer bits for the 8-byte sizeclass
+		// on 64-bit platforms.
+		c.scanAlloc += 8
+	} else {
+		c.scanAlloc += heapSetTypeNoHeader(uintptr(x), size, typ, span)
+	}
+	size = uintptr(class_to_size[sizeclass])
+
+	// Ensure that the stores above that initialize x to
+	// type-safe memory and set the heap bits occur before
+	// the caller can make x observable to the garbage
+	// collector. Otherwise, on weakly ordered machines,
+	// the garbage collector could follow a pointer to x,
+	// but see uninitialized memory or stale heap bits.
+	publicationBarrier()
+	// As x and the heap bits are initialized, update
+	// freeIndexForScan now so x is seen by the GC
+	// (including conservative scan) as an allocated object.
+	// While this pointer can't escape into user code as a
+	// _live_ pointer until we return, conservative scanning
+	// may find a dead pointer that happens to point into this
+	// object. Delaying this update until now ensures that
+	// conservative scanning considers this pointer dead until
+	// this point.
+	span.freeIndexForScan = span.freeindex
+
+	// Allocate black during GC.
+	// All slots hold nil so no scanning is needed.
+	// This may be racing with GC so do it atomically if there can be
+	// a race marking the bit.
+	if writeBarrier.enabled {
+		gcmarknewobject(span, uintptr(x))
+	}
+
+	// Note cache c only valid while m acquired; see #47302
+	//
+	// N.B. Use the full size because that matches how the GC
+	// will update the mem profile on the "free" side.
+	//
+	// TODO(mknyszek): We should really count the header as part
+	// of gc_sys or something. The code below just pretends it is
+	// internal fragmentation and matches the GC's accounting by
+	// using the whole allocation slot.
+	c.nextSample -= int64(size)
+	if c.nextSample < 0 || MemProfileRate != c.memProfRate {
+		profilealloc(mp, x, size)
+	}
+	mp.mallocing = 0
+	releasem(mp)
+
+	if checkGCTrigger {
+		if t := (gcTrigger{kind: gcTriggerHeap}); t.test() {
+			gcStart(t)
+		}
+	}
+	return x, size
+}
+
+func mallocgcSmallScanHeader(size uintptr, typ *_type, needzero bool) (unsafe.Pointer, uintptr) {
+	// Set mp.mallocing to keep from being preempted by GC.
+	mp := acquirem()
+	if doubleCheckMalloc {
+		if mp.mallocing != 0 {
+			throw("malloc deadlock")
+		}
+		if mp.gsignal == getg() {
+			throw("malloc during signal")
+		}
+		if typ == nil || !typ.Pointers() {
+			throw("noscan allocated in scan-only path")
+		}
+		if heapBitsInSpan(size) {
+			throw("heap bits in span for header-only path")
+		}
+	}
+	mp.mallocing = 1
+
+	checkGCTrigger := false
+	c := getMCache(mp)
+	size += mallocHeaderSize
+	var sizeclass uint8
+	if size <= smallSizeMax-8 {
+		sizeclass = size_to_class8[divRoundUp(size, smallSizeDiv)]
+	} else {
+		sizeclass = size_to_class128[divRoundUp(size-smallSizeMax, largeSizeDiv)]
+	}
+	size = uintptr(class_to_size[sizeclass])
+	spc := makeSpanClass(sizeclass, false)
+	span := c.alloc[spc]
+	v := nextFreeFast(span)
+	if v == 0 {
+		v, span, checkGCTrigger = c.nextFree(spc)
+	}
+	x := unsafe.Pointer(v)
+	if needzero && span.needzero != 0 {
+		memclrNoHeapPointers(x, size)
+	}
+	header := (**_type)(x)
+	x = add(x, mallocHeaderSize)
+	c.scanAlloc += heapSetTypeSmallHeader(uintptr(x), size-mallocHeaderSize, typ, header, span)
+
+	// Ensure that the stores above that initialize x to
+	// type-safe memory and set the heap bits occur before
+	// the caller can make x observable to the garbage
+	// collector. Otherwise, on weakly ordered machines,
+	// the garbage collector could follow a pointer to x,
+	// but see uninitialized memory or stale heap bits.
+	publicationBarrier()
+	// As x and the heap bits are initialized, update
+	// freeIndexForScan now so x is seen by the GC
+	// (including conservative scan) as an allocated object.
+	// While this pointer can't escape into user code as a
+	// _live_ pointer until we return, conservative scanning
+	// may find a dead pointer that happens to point into this
+	// object. Delaying this update until now ensures that
+	// conservative scanning considers this pointer dead until
+	// this point.
+	span.freeIndexForScan = span.freeindex
+
+	// Allocate black during GC.
+	// All slots hold nil so no scanning is needed.
+	// This may be racing with GC so do it atomically if there can be
+	// a race marking the bit.
+	if writeBarrier.enabled {
+		gcmarknewobject(span, uintptr(x))
+	}
+
+	// Note cache c only valid while m acquired; see #47302
+	//
+	// N.B. Use the full size because that matches how the GC
+	// will update the mem profile on the "free" side.
+	//
+	// TODO(mknyszek): We should really count the header as part
+	// of gc_sys or something. The code below just pretends it is
+	// internal fragmentation and matches the GC's accounting by
+	// using the whole allocation slot.
+	c.nextSample -= int64(size)
+	if c.nextSample < 0 || MemProfileRate != c.memProfRate {
+		profilealloc(mp, x, size)
+	}
+	mp.mallocing = 0
+	releasem(mp)
+
+	if checkGCTrigger {
+		if t := (gcTrigger{kind: gcTriggerHeap}); t.test() {
+			gcStart(t)
+		}
+	}
+	return x, size
+}
+
+func mallocgcLarge(size uintptr, typ *_type, needzero bool) (unsafe.Pointer, uintptr) {
+	// Set mp.mallocing to keep from being preempted by GC.
+	mp := acquirem()
+	if doubleCheckMalloc {
+		if mp.mallocing != 0 {
+			throw("malloc deadlock")
+		}
+		if mp.gsignal == getg() {
+			throw("malloc during signal")
+		}
+	}
+	mp.mallocing = 1
+
+	c := getMCache(mp)
+	// For large allocations, keep track of zeroed state so that
+	// bulk zeroing can be happen later in a preemptible context.
+	span := c.allocLarge(size, typ == nil || !typ.Pointers())
+	span.freeindex = 1
+	span.allocCount = 1
+	span.largeType = nil // Tell the GC not to look at this yet.
+	size = span.elemsize
+	x := unsafe.Pointer(span.base())
+
+	// Ensure that the stores above that initialize x to
+	// type-safe memory and set the heap bits occur before
+	// the caller can make x observable to the garbage
+	// collector. Otherwise, on weakly ordered machines,
+	// the garbage collector could follow a pointer to x,
+	// but see uninitialized memory or stale heap bits.
+	publicationBarrier()
+	// As x and the heap bits are initialized, update
+	// freeIndexForScan now so x is seen by the GC
+	// (including conservative scan) as an allocated object.
+	// While this pointer can't escape into user code as a
+	// _live_ pointer until we return, conservative scanning
+	// may find a dead pointer that happens to point into this
+	// object. Delaying this update until now ensures that
+	// conservative scanning considers this pointer dead until
+	// this point.
+	span.freeIndexForScan = span.freeindex
+
+	// Allocate black during GC.
+	// All slots hold nil so no scanning is needed.
+	// This may be racing with GC so do it atomically if there can be
+	// a race marking the bit.
+	if writeBarrier.enabled {
+		gcmarknewobject(span, uintptr(x))
+	}
+
+	// Note cache c only valid while m acquired; see #47302
+	//
+	// N.B. Use the full size because that matches how the GC
+	// will update the mem profile on the "free" side.
+	//
+	// TODO(mknyszek): We should really count the header as part
+	// of gc_sys or something. The code below just pretends it is
+	// internal fragmentation and matches the GC's accounting by
+	// using the whole allocation slot.
+	c.nextSample -= int64(size)
+	if c.nextSample < 0 || MemProfileRate != c.memProfRate {
+		profilealloc(mp, x, size)
+	}
+	mp.mallocing = 0
+	releasem(mp)
+
+	// Check to see if we need to trigger the GC.
+	if t := (gcTrigger{kind: gcTriggerHeap}); t.test() {
+		gcStart(t)
+	}
+
+	// Objects can be zeroed late in a context where preemption can occur.
+	// If the object contains pointers, its pointer data must be cleared
+	// or otherwise indicate that the GC shouldn't scan it.
+	// x will keep the memory alive.
+	if noscan := typ == nil || !typ.Pointers(); !noscan || (needzero && span.needzero != 0) {
+		// N.B. size == fullSize always in this case.
+		memclrNoHeapPointersChunked(size, x) // This is a possible preemption point: see #47302
+
+		// Finish storing the type information for this case.
+		mp := acquirem()
+		if !noscan {
+			getMCache(mp).scanAlloc += heapSetTypeLarge(uintptr(x), size, typ, span)
+		}
+		// Publish the object with the now-zeroed memory.
+		publicationBarrier()
+		releasem(mp)
+	}
+	return x, size
+}
+
+func preMallocgcDebug(size uintptr, typ *_type) unsafe.Pointer {
+	if debug.sbrk != 0 {
+		align := uintptr(16)
+		if typ != nil {
+			// TODO(austin): This should be just
+			//   align = uintptr(typ.align)
+			// but that's only 4 on 32-bit platforms,
+			// even if there's a uint64 field in typ (see #599).
+			// This causes 64-bit atomic accesses to panic.
+			// Hence, we use stricter alignment that matches
+			// the normal allocator better.
+			if size&7 == 0 {
+				align = 8
+			} else if size&3 == 0 {
+				align = 4
+			} else if size&1 == 0 {
+				align = 2
+			} else {
+				align = 1
+			}
+		}
+		return persistentalloc(size, align, &memstats.other_sys)
+	}
+	if inittrace.active && inittrace.id == getg().goid {
+		// Init functions are executed sequentially in a single goroutine.
+		inittrace.allocs += 1
+	}
+	return nil
+}
+
+func postMallocgcDebug(x unsafe.Pointer, elemsize uintptr, typ *_type) {
+	if inittrace.active && inittrace.id == getg().goid {
+		// Init functions are executed sequentially in a single goroutine.
+		inittrace.bytes += uint64(elemsize)
+	}
+
+	if traceAllocFreeEnabled() {
+		trace := traceAcquire()
+		if trace.ok() {
+			trace.HeapObjectAlloc(uintptr(x), typ)
+			traceRelease(trace)
+		}
+	}
 }
 
 // deductAssistCredit reduces the current G's assist credit
@@ -1330,26 +1662,22 @@ func mallocgc(size uintptr, typ *_type, needzero bool) unsafe.Pointer {
 // Caller must be preemptible.
 //
 // Returns the G for which the assist credit was accounted.
-func deductAssistCredit(size uintptr) *g {
-	var assistG *g
-	if gcBlackenEnabled != 0 {
-		// Charge the current user G for this allocation.
-		assistG = getg()
-		if assistG.m.curg != nil {
-			assistG = assistG.m.curg
-		}
-		// Charge the allocation against the G. We'll account
-		// for internal fragmentation at the end of mallocgc.
-		assistG.gcAssistBytes -= int64(size)
-
-		if assistG.gcAssistBytes < 0 {
-			// This G is in debt. Assist the GC to correct
-			// this before allocating. This must happen
-			// before disabling preemption.
-			gcAssistAlloc(assistG)
-		}
+func deductAssistCredit(size uintptr) {
+	// Charge the current user G for this allocation.
+	assistG := getg()
+	if assistG.m.curg != nil {
+		assistG = assistG.m.curg
+	}
+	// Charge the allocation against the G. We'll account
+	// for internal fragmentation at the end of mallocgc.
+	assistG.gcAssistBytes -= int64(size)
+
+	if assistG.gcAssistBytes < 0 {
+		// This G is in debt. Assist the GC to correct
+		// this before allocating. This must happen
+		// before disabling preemption.
+		gcAssistAlloc(assistG)
 	}
-	return assistG
 }
 
 // memclrNoHeapPointersChunked repeatedly calls memclrNoHeapPointers
@@ -1386,6 +1714,11 @@ func newobject(typ *_type) unsafe.Pointer {
 	return mallocgc(typ.Size_, typ, true)
 }
 
+//go:linkname maps_newobject internal/runtime/maps.newobject
+func maps_newobject(typ *_type) unsafe.Pointer {
+	return newobject(typ)
+}
+
 // reflect_unsafe_New is meant for package reflect,
 // but widely used packages access it using linkname.
 // Notable members of the hall of shame include:
@@ -1450,11 +1783,21 @@ func reflect_unsafe_NewArray(typ *_type, n int) unsafe.Pointer {
 	return newarray(typ, n)
 }
 
+//go:linkname maps_newarray internal/runtime/maps.newarray
+func maps_newarray(typ *_type, n int) unsafe.Pointer {
+	return newarray(typ, n)
+}
+
+// profilealloc resets the current mcache's nextSample counter and
+// records a memory profile sample.
+//
+// The caller must be non-preemptible and have a P.
 func profilealloc(mp *m, x unsafe.Pointer, size uintptr) {
 	c := getMCache(mp)
 	if c == nil {
 		throw("profilealloc called without a P or outside bootstrapping")
 	}
+	c.memProfRate = MemProfileRate
 	c.nextSample = nextSample()
 	mProf_Malloc(mp, x, size)
 }
@@ -1466,12 +1809,13 @@ func profilealloc(mp *m, x unsafe.Pointer, size uintptr) {
 // processes, the distance between two samples follows the exponential
 // distribution (exp(MemProfileRate)), so the best return value is a random
 // number taken from an exponential distribution whose mean is MemProfileRate.
-func nextSample() uintptr {
+func nextSample() int64 {
+	if MemProfileRate == 0 {
+		// Basically never sample.
+		return maxInt64
+	}
 	if MemProfileRate == 1 {
-		// Callers assign our return value to
-		// mcache.next_sample, but next_sample is not used
-		// when the rate is 1. So avoid the math below and
-		// just return something.
+		// Sample immediately.
 		return 0
 	}
 	if GOOS == "plan9" {
@@ -1481,7 +1825,7 @@ func nextSample() uintptr {
 		}
 	}
 
-	return uintptr(fastexprand(MemProfileRate))
+	return int64(fastexprand(MemProfileRate))
 }
 
 // fastexprand returns a random number from an exponential distribution with
@@ -1516,14 +1860,14 @@ func fastexprand(mean int) int32 {
 
 // nextSampleNoFP is similar to nextSample, but uses older,
 // simpler code to avoid floating point.
-func nextSampleNoFP() uintptr {
+func nextSampleNoFP() int64 {
 	// Set first allocation sample size.
 	rate := MemProfileRate
 	if rate > 0x3fffffff { // make 2*rate not overflow
 		rate = 0x3fffffff
 	}
 	if rate != 0 {
-		return uintptr(cheaprandn(uint32(2 * rate)))
+		return int64(cheaprandn(uint32(2 * rate)))
 	}
 	return 0
 }
@@ -1555,7 +1899,11 @@ var persistentChunks *notInHeap
 // sysStat must be non-nil.
 //
 // Consider marking persistentalloc'd types not in heap by embedding
-// runtime/internal/sys.NotInHeap.
+// internal/runtime/sys.NotInHeap.
+//
+// nosplit because it is used during write barriers and must not be preempted.
+//
+//go:nosplit
 func persistentalloc(size, align uintptr, sysStat *sysMemStat) unsafe.Pointer {
 	var p *notInHeap
 	systemstack(func() {
@@ -1697,7 +2045,7 @@ func (l *linearAlloc) alloc(size, align uintptr, sysStat *sysMemStat) unsafe.Poi
 // like sysAlloc or persistentAlloc.
 //
 // In general, it's better to use real types which embed
-// runtime/internal/sys.NotInHeap, but this serves as a generic type
+// internal/runtime/sys.NotInHeap, but this serves as a generic type
 // for situations where that isn't possible (like in the allocators).
 //
 // TODO: Use this as the return type of sysAlloc, persistentAlloc, etc?
@@ -1707,9 +2055,9 @@ func (p *notInHeap) add(bytes uintptr) *notInHeap {
 	return (*notInHeap)(unsafe.Pointer(uintptr(unsafe.Pointer(p)) + bytes))
 }
 
-// computeRZlog computes the size of the redzone.
+// redZoneSize computes the size of the redzone for a given allocation.
 // Refer to the implementation of the compiler-rt.
-func computeRZlog(userSize uintptr) uintptr {
+func redZoneSize(userSize uintptr) uintptr {
 	switch {
 	case userSize <= (64 - 16):
 		return 16 << 0
diff --git a/src/runtime/malloc_test.go b/src/runtime/malloc_test.go
index 8c162fbe..67bceef2 100644
--- a/src/runtime/malloc_test.go
+++ b/src/runtime/malloc_test.go
@@ -7,6 +7,7 @@ package runtime_test
 import (
 	"flag"
 	"fmt"
+	"internal/asan"
 	"internal/race"
 	"internal/testenv"
 	"os"
@@ -157,6 +158,9 @@ func TestTinyAlloc(t *testing.T) {
 	if runtime.Raceenabled {
 		t.Skip("tinyalloc suppressed when running in race mode")
 	}
+	if asan.Enabled {
+		t.Skip("tinyalloc suppressed when running in asan mode due to redzone")
+	}
 	const N = 16
 	var v [N]unsafe.Pointer
 	for i := range v {
@@ -182,6 +186,9 @@ func TestTinyAllocIssue37262(t *testing.T) {
 	if runtime.Raceenabled {
 		t.Skip("tinyalloc suppressed when running in race mode")
 	}
+	if asan.Enabled {
+		t.Skip("tinyalloc suppressed when running in asan mode due to redzone")
+	}
 	// Try to cause an alignment access fault
 	// by atomically accessing the first 64-bit
 	// value of a tiny-allocated object.
diff --git a/src/runtime/map_benchmark_test.go b/src/runtime/map_benchmark_test.go
index 43d1accb..43c8f0bb 100644
--- a/src/runtime/map_benchmark_test.go
+++ b/src/runtime/map_benchmark_test.go
@@ -5,13 +5,20 @@
 package runtime_test
 
 import (
+	"encoding/binary"
+	"flag"
 	"fmt"
 	"math/rand"
+	"runtime"
+	"slices"
 	"strconv"
 	"strings"
 	"testing"
+	"unsafe"
 )
 
+var mapbench = flag.Bool("mapbench", false, "enable the full set of map benchmark variants")
+
 const size = 10
 
 func BenchmarkHashStringSpeed(b *testing.B) {
@@ -189,10 +196,12 @@ func BenchmarkSmallStrMap(b *testing.B) {
 	}
 }
 
-func BenchmarkMapStringKeysEight_16(b *testing.B) { benchmarkMapStringKeysEight(b, 16) }
-func BenchmarkMapStringKeysEight_32(b *testing.B) { benchmarkMapStringKeysEight(b, 32) }
-func BenchmarkMapStringKeysEight_64(b *testing.B) { benchmarkMapStringKeysEight(b, 64) }
-func BenchmarkMapStringKeysEight_1M(b *testing.B) { benchmarkMapStringKeysEight(b, 1<<20) }
+func BenchmarkMapStringKeysEight_16(b *testing.B)  { benchmarkMapStringKeysEight(b, 16) }
+func BenchmarkMapStringKeysEight_32(b *testing.B)  { benchmarkMapStringKeysEight(b, 32) }
+func BenchmarkMapStringKeysEight_64(b *testing.B)  { benchmarkMapStringKeysEight(b, 64) }
+func BenchmarkMapStringKeysEight_128(b *testing.B) { benchmarkMapStringKeysEight(b, 128) }
+func BenchmarkMapStringKeysEight_256(b *testing.B) { benchmarkMapStringKeysEight(b, 256) }
+func BenchmarkMapStringKeysEight_1M(b *testing.B)  { benchmarkMapStringKeysEight(b, 1<<20) }
 
 func benchmarkMapStringKeysEight(b *testing.B, keySize int) {
 	m := make(map[string]bool)
@@ -206,17 +215,6 @@ func benchmarkMapStringKeysEight(b *testing.B, keySize int) {
 	}
 }
 
-func BenchmarkIntMap(b *testing.B) {
-	m := make(map[int]bool)
-	for i := 0; i < 8; i++ {
-		m[i] = true
-	}
-	b.ResetTimer()
-	for i := 0; i < b.N; i++ {
-		_, _ = m[7]
-	}
-}
-
 func BenchmarkMapFirst(b *testing.B) {
 	for n := 1; n <= 16; n++ {
 		b.Run(fmt.Sprintf("%d", n), func(b *testing.B) {
@@ -260,12 +258,41 @@ func BenchmarkMapLast(b *testing.B) {
 	}
 }
 
+func cyclicPermutation(n int) []int {
+	// From https://crypto.stackexchange.com/questions/51787/creating-single-cycle-permutations
+	p := rand.New(rand.NewSource(1)).Perm(n)
+	inc := make([]int, n)
+	pInv := make([]int, n)
+	for i := 0; i < n; i++ {
+		inc[i] = (i + 1) % n
+		pInv[p[i]] = i
+	}
+	res := make([]int, n)
+	for i := 0; i < n; i++ {
+		res[i] = pInv[inc[p[i]]]
+	}
+
+	// Test result.
+	j := 0
+	for i := 0; i < n-1; i++ {
+		j = res[j]
+		if j == 0 {
+			panic("got back to 0 too early")
+		}
+	}
+	j = res[j]
+	if j != 0 {
+		panic("didn't get back to 0")
+	}
+	return res
+}
+
 func BenchmarkMapCycle(b *testing.B) {
 	// Arrange map entries to be a permutation, so that
 	// we hit all entries, and one lookup is data dependent
 	// on the previous lookup.
 	const N = 3127
-	p := rand.New(rand.NewSource(1)).Perm(N)
+	p := cyclicPermutation(N)
 	m := map[int]int{}
 	for i := 0; i < N; i++ {
 		m[i] = p[i]
@@ -333,27 +360,6 @@ func BenchmarkNewSmallMap(b *testing.B) {
 	}
 }
 
-func BenchmarkMapIter(b *testing.B) {
-	m := make(map[int]bool)
-	for i := 0; i < 8; i++ {
-		m[i] = true
-	}
-	b.ResetTimer()
-	for i := 0; i < b.N; i++ {
-		for range m {
-		}
-	}
-}
-
-func BenchmarkMapIterEmpty(b *testing.B) {
-	m := make(map[int]bool)
-	b.ResetTimer()
-	for i := 0; i < b.N; i++ {
-		for range m {
-		}
-	}
-}
-
 func BenchmarkSameLengthMap(b *testing.B) {
 	// long strings, same length, differ in first few
 	// and last few bytes.
@@ -368,28 +374,6 @@ func BenchmarkSameLengthMap(b *testing.B) {
 	}
 }
 
-type BigKey [3]int64
-
-func BenchmarkBigKeyMap(b *testing.B) {
-	m := make(map[BigKey]bool)
-	k := BigKey{3, 4, 5}
-	m[k] = true
-	for i := 0; i < b.N; i++ {
-		_ = m[k]
-	}
-}
-
-type BigVal [3]int64
-
-func BenchmarkBigValMap(b *testing.B) {
-	m := make(map[BigKey]BigVal)
-	k := BigKey{3, 4, 5}
-	m[k] = BigVal{6, 7, 8}
-	for i := 0; i < b.N; i++ {
-		_ = m[k]
-	}
-}
-
 func BenchmarkSmallKeyMap(b *testing.B) {
 	m := make(map[int16]bool)
 	m[5] = true
@@ -538,3 +522,669 @@ func BenchmarkNewEmptyMapHintGreaterThan8(b *testing.B) {
 		_ = make(map[int]int, hintGreaterThan8)
 	}
 }
+
+func benchSizes(f func(b *testing.B, n int)) func(*testing.B) {
+	var cases = []int{
+		0,
+		6,
+		12,
+		18,
+		24,
+		30,
+		64,
+		128,
+		256,
+		512,
+		1024,
+		2048,
+		4096,
+		8192,
+		1 << 16,
+		1 << 18,
+		1 << 20,
+		1 << 22,
+	}
+
+	// Cases enabled by default. Set -mapbench for the remainder.
+	//
+	// With the other type combinations, there are literally thousands of
+	// variations. It take too long to run all of these as part of
+	// builders.
+	byDefault := map[int]bool{
+		6:       true,
+		64:      true,
+		1 << 16: true,
+	}
+
+	return func(b *testing.B) {
+		for _, n := range cases {
+			b.Run("len="+strconv.Itoa(n), func(b *testing.B) {
+				if !*mapbench && !byDefault[n] {
+					b.Skip("Skipped because -mapbench=false")
+				}
+
+				f(b, n)
+			})
+		}
+	}
+}
+func smallBenchSizes(f func(b *testing.B, n int)) func(*testing.B) {
+	return func(b *testing.B) {
+		for n := 1; n <= 8; n++ {
+			b.Run("len="+strconv.Itoa(n), func(b *testing.B) {
+				f(b, n)
+			})
+		}
+	}
+}
+
+// A 16 byte type.
+type smallType [16]byte
+
+// A 512 byte type.
+type mediumType [1 << 9]byte
+
+// A 4KiB type.
+type bigType [1 << 12]byte
+
+type mapBenchmarkKeyType interface {
+	int32 | int64 | string | smallType | mediumType | bigType | *int32
+}
+
+type mapBenchmarkElemType interface {
+	mapBenchmarkKeyType | []int32
+}
+
+func genIntValues[T int | int32 | int64](start, end int) []T {
+	vals := make([]T, 0, end-start)
+	for i := start; i < end; i++ {
+		vals = append(vals, T(i))
+	}
+	return vals
+}
+
+func genStringValues(start, end int) []string {
+	vals := make([]string, 0, end-start)
+	for i := start; i < end; i++ {
+		vals = append(vals, strconv.Itoa(i))
+	}
+	return vals
+}
+
+func genSmallValues(start, end int) []smallType {
+	vals := make([]smallType, 0, end-start)
+	for i := start; i < end; i++ {
+		var v smallType
+		binary.NativeEndian.PutUint64(v[:], uint64(i))
+		vals = append(vals, v)
+	}
+	return vals
+}
+
+func genMediumValues(start, end int) []mediumType {
+	vals := make([]mediumType, 0, end-start)
+	for i := start; i < end; i++ {
+		var v mediumType
+		binary.NativeEndian.PutUint64(v[:], uint64(i))
+		vals = append(vals, v)
+	}
+	return vals
+}
+
+func genBigValues(start, end int) []bigType {
+	vals := make([]bigType, 0, end-start)
+	for i := start; i < end; i++ {
+		var v bigType
+		binary.NativeEndian.PutUint64(v[:], uint64(i))
+		vals = append(vals, v)
+	}
+	return vals
+}
+
+func genPtrValues[T any](start, end int) []*T {
+	// Start and end don't mean much. Each pointer by definition has a
+	// unique identity.
+	vals := make([]*T, 0, end-start)
+	for i := start; i < end; i++ {
+		v := new(T)
+		vals = append(vals, v)
+	}
+	return vals
+}
+
+func genIntSliceValues[T int | int32 | int64](start, end int) [][]T {
+	vals := make([][]T, 0, end-start)
+	for i := start; i < end; i++ {
+		vals = append(vals, []T{T(i)})
+	}
+	return vals
+}
+
+func genValues[T mapBenchmarkElemType](start, end int) []T {
+	var t T
+	switch any(t).(type) {
+	case int32:
+		return any(genIntValues[int32](start, end)).([]T)
+	case int64:
+		return any(genIntValues[int64](start, end)).([]T)
+	case string:
+		return any(genStringValues(start, end)).([]T)
+	case smallType:
+		return any(genSmallValues(start, end)).([]T)
+	case mediumType:
+		return any(genMediumValues(start, end)).([]T)
+	case bigType:
+		return any(genBigValues(start, end)).([]T)
+	case *int32:
+		return any(genPtrValues[int32](start, end)).([]T)
+	case []int32:
+		return any(genIntSliceValues[int32](start, end)).([]T)
+	default:
+		panic("unreachable")
+	}
+}
+
+// Avoid inlining to force a heap allocation.
+//
+//go:noinline
+func newSink[T mapBenchmarkElemType]() *T {
+	return new(T)
+}
+
+// Return a new maps filled with keys and elems. Both slices must be the same length.
+func fillMap[K mapBenchmarkKeyType, E mapBenchmarkElemType](keys []K, elems []E) map[K]E {
+	m := make(map[K]E, len(keys))
+	for i := range keys {
+		m[keys[i]] = elems[i]
+	}
+	return m
+}
+
+func iterCount(b *testing.B, n int) int {
+	// Divide b.N by n so that the ns/op reports time per element,
+	// not time per full map iteration. This makes benchmarks of
+	// different map sizes more comparable.
+	//
+	// If size is zero we still need to do iterations.
+	if n == 0 {
+		return b.N
+	}
+	return b.N / n
+}
+
+func checkAllocSize[K, E any](b *testing.B, n int) {
+	var k K
+	size := uint64(n) * uint64(unsafe.Sizeof(k))
+	var e E
+	size += uint64(n) * uint64(unsafe.Sizeof(e))
+
+	if size >= 1<<30 {
+		b.Skipf("Total key+elem size %d exceeds 1GiB", size)
+	}
+}
+
+func benchmarkMapIter[K mapBenchmarkKeyType, E mapBenchmarkElemType](b *testing.B, n int) {
+	checkAllocSize[K, E](b, n)
+	k := genValues[K](0, n)
+	e := genValues[E](0, n)
+	m := fillMap(k, e)
+	iterations := iterCount(b, n)
+	sinkK := newSink[K]()
+	sinkE := newSink[E]()
+	b.ResetTimer()
+
+	for i := 0; i < iterations; i++ {
+		for k, e := range m {
+			*sinkK = k
+			*sinkE = e
+		}
+	}
+}
+
+func BenchmarkMapIter(b *testing.B) {
+	b.Run("Key=int32/Elem=int32", benchSizes(benchmarkMapIter[int32, int32]))
+	b.Run("Key=int64/Elem=int64", benchSizes(benchmarkMapIter[int64, int64]))
+	b.Run("Key=string/Elem=string", benchSizes(benchmarkMapIter[string, string]))
+	b.Run("Key=smallType/Elem=int32", benchSizes(benchmarkMapIter[smallType, int32]))
+	b.Run("Key=mediumType/Elem=int32", benchSizes(benchmarkMapIter[mediumType, int32]))
+	b.Run("Key=bigType/Elem=int32", benchSizes(benchmarkMapIter[bigType, int32]))
+	b.Run("Key=bigType/Elem=bigType", benchSizes(benchmarkMapIter[bigType, bigType]))
+	b.Run("Key=int32/Elem=bigType", benchSizes(benchmarkMapIter[int32, bigType]))
+	b.Run("Key=*int32/Elem=int32", benchSizes(benchmarkMapIter[*int32, int32]))
+	b.Run("Key=int32/Elem=*int32", benchSizes(benchmarkMapIter[int32, *int32]))
+}
+
+func benchmarkMapIterLowLoad[K mapBenchmarkKeyType, E mapBenchmarkElemType](b *testing.B, n int) {
+	// Only insert one entry regardless of map size.
+	k := genValues[K](0, 1)
+	e := genValues[E](0, 1)
+
+	m := make(map[K]E, n)
+	for i := range k {
+		m[k[i]] = e[i]
+	}
+
+	iterations := iterCount(b, n)
+	sinkK := newSink[K]()
+	sinkE := newSink[E]()
+	b.ResetTimer()
+
+	for i := 0; i < iterations; i++ {
+		for k, e := range m {
+			*sinkK = k
+			*sinkE = e
+		}
+	}
+}
+
+func BenchmarkMapIterLowLoad(b *testing.B) {
+	b.Run("Key=int32/Elem=int32", benchSizes(benchmarkMapIterLowLoad[int32, int32]))
+	b.Run("Key=int64/Elem=int64", benchSizes(benchmarkMapIterLowLoad[int64, int64]))
+	b.Run("Key=string/Elem=string", benchSizes(benchmarkMapIterLowLoad[string, string]))
+	b.Run("Key=smallType/Elem=int32", benchSizes(benchmarkMapIterLowLoad[smallType, int32]))
+	b.Run("Key=mediumType/Elem=int32", benchSizes(benchmarkMapIterLowLoad[mediumType, int32]))
+	b.Run("Key=bigType/Elem=int32", benchSizes(benchmarkMapIterLowLoad[bigType, int32]))
+	b.Run("Key=bigType/Elem=bigType", benchSizes(benchmarkMapIterLowLoad[bigType, bigType]))
+	b.Run("Key=int32/Elem=bigType", benchSizes(benchmarkMapIterLowLoad[int32, bigType]))
+	b.Run("Key=*int32/Elem=int32", benchSizes(benchmarkMapIterLowLoad[*int32, int32]))
+	b.Run("Key=int32/Elem=*int32", benchSizes(benchmarkMapIterLowLoad[int32, *int32]))
+}
+
+func benchmarkMapAccessHit[K mapBenchmarkKeyType, E mapBenchmarkElemType](b *testing.B, n int) {
+	if n == 0 {
+		b.Skip("can't access empty map")
+	}
+	checkAllocSize[K, E](b, n)
+	k := genValues[K](0, n)
+	e := genValues[E](0, n)
+	m := fillMap(k, e)
+	sink := newSink[E]()
+	b.ResetTimer()
+
+	for i := 0; i < b.N; i++ {
+		*sink = m[k[i%n]]
+	}
+}
+
+func BenchmarkMapAccessHit(b *testing.B) {
+	b.Run("Key=int32/Elem=int32", benchSizes(benchmarkMapAccessHit[int32, int32]))
+	b.Run("Key=int64/Elem=int64", benchSizes(benchmarkMapAccessHit[int64, int64]))
+	b.Run("Key=string/Elem=string", benchSizes(benchmarkMapAccessHit[string, string]))
+	b.Run("Key=smallType/Elem=int32", benchSizes(benchmarkMapAccessHit[smallType, int32]))
+	b.Run("Key=mediumType/Elem=int32", benchSizes(benchmarkMapAccessHit[mediumType, int32]))
+	b.Run("Key=bigType/Elem=int32", benchSizes(benchmarkMapAccessHit[bigType, int32]))
+	b.Run("Key=bigType/Elem=bigType", benchSizes(benchmarkMapAccessHit[bigType, bigType]))
+	b.Run("Key=int32/Elem=bigType", benchSizes(benchmarkMapAccessHit[int32, bigType]))
+	b.Run("Key=*int32/Elem=int32", benchSizes(benchmarkMapAccessHit[*int32, int32]))
+	b.Run("Key=int32/Elem=*int32", benchSizes(benchmarkMapAccessHit[int32, *int32]))
+}
+
+var sinkOK bool
+
+func benchmarkMapAccessMiss[K mapBenchmarkKeyType, E mapBenchmarkElemType](b *testing.B, n int) {
+	checkAllocSize[K, E](b, n)
+	k := genValues[K](0, n)
+	e := genValues[E](0, n)
+	m := fillMap(k, e)
+	if n == 0 { // Create a lookup values for empty maps.
+		n = 1
+	}
+	w := genValues[K](n, 2*n)
+	b.ResetTimer()
+
+	var ok bool
+	for i := 0; i < b.N; i++ {
+		_, ok = m[w[i%n]]
+	}
+
+	sinkOK = ok
+}
+
+func BenchmarkMapAccessMiss(b *testing.B) {
+	b.Run("Key=int32/Elem=int32", benchSizes(benchmarkMapAccessMiss[int32, int32]))
+	b.Run("Key=int64/Elem=int64", benchSizes(benchmarkMapAccessMiss[int64, int64]))
+	b.Run("Key=string/Elem=string", benchSizes(benchmarkMapAccessMiss[string, string]))
+	b.Run("Key=smallType/Elem=int32", benchSizes(benchmarkMapAccessMiss[smallType, int32]))
+	b.Run("Key=mediumType/Elem=int32", benchSizes(benchmarkMapAccessMiss[mediumType, int32]))
+	b.Run("Key=bigType/Elem=int32", benchSizes(benchmarkMapAccessMiss[bigType, int32]))
+	b.Run("Key=bigType/Elem=bigType", benchSizes(benchmarkMapAccessMiss[bigType, bigType]))
+	b.Run("Key=int32/Elem=bigType", benchSizes(benchmarkMapAccessMiss[int32, bigType]))
+	b.Run("Key=*int32/Elem=int32", benchSizes(benchmarkMapAccessMiss[*int32, int32]))
+	b.Run("Key=int32/Elem=*int32", benchSizes(benchmarkMapAccessMiss[int32, *int32]))
+}
+
+// Assign to a key that already exists.
+func benchmarkMapAssignExists[K mapBenchmarkKeyType, E mapBenchmarkElemType](b *testing.B, n int) {
+	if n == 0 {
+		b.Skip("can't assign to existing keys in empty map")
+	}
+	checkAllocSize[K, E](b, n)
+	k := genValues[K](0, n)
+	e := genValues[E](0, n)
+	m := fillMap(k, e)
+	b.ResetTimer()
+
+	for i := 0; i < b.N; i++ {
+		m[k[i%n]] = e[i%n]
+	}
+}
+
+func BenchmarkMapAssignExists(b *testing.B) {
+	b.Run("Key=int32/Elem=int32", benchSizes(benchmarkMapAssignExists[int32, int32]))
+	b.Run("Key=int64/Elem=int64", benchSizes(benchmarkMapAssignExists[int64, int64]))
+	b.Run("Key=string/Elem=string", benchSizes(benchmarkMapAssignExists[string, string]))
+	b.Run("Key=smallType/Elem=int32", benchSizes(benchmarkMapAssignExists[smallType, int32]))
+	b.Run("Key=mediumType/Elem=int32", benchSizes(benchmarkMapAssignExists[mediumType, int32]))
+	b.Run("Key=bigType/Elem=int32", benchSizes(benchmarkMapAssignExists[bigType, int32]))
+	b.Run("Key=bigType/Elem=bigType", benchSizes(benchmarkMapAssignExists[bigType, bigType]))
+	b.Run("Key=int32/Elem=bigType", benchSizes(benchmarkMapAssignExists[int32, bigType]))
+	b.Run("Key=*int32/Elem=int32", benchSizes(benchmarkMapAssignExists[*int32, int32]))
+	b.Run("Key=int32/Elem=*int32", benchSizes(benchmarkMapAssignExists[int32, *int32]))
+}
+
+// Fill a map of size n with no hint. Time is per-key. A new map is created
+// every n assignments.
+//
+// TODO(prattmic): Results don't make much sense if b.N < n.
+// TODO(prattmic): Measure distribution of assign time to reveal the grow
+// latency.
+func benchmarkMapAssignFillNoHint[K mapBenchmarkKeyType, E mapBenchmarkElemType](b *testing.B, n int) {
+	if n == 0 {
+		b.Skip("can't create empty map via assignment")
+	}
+	checkAllocSize[K, E](b, n)
+	k := genValues[K](0, n)
+	e := genValues[E](0, n)
+	b.ResetTimer()
+
+	var m map[K]E
+	for i := 0; i < b.N; i++ {
+		if i%n == 0 {
+			m = make(map[K]E)
+		}
+		m[k[i%n]] = e[i%n]
+	}
+}
+
+func BenchmarkMapAssignFillNoHint(b *testing.B) {
+	b.Run("Key=int32/Elem=int32", benchSizes(benchmarkMapAssignFillNoHint[int32, int32]))
+	b.Run("Key=int64/Elem=int64", benchSizes(benchmarkMapAssignFillNoHint[int64, int64]))
+	b.Run("Key=string/Elem=string", benchSizes(benchmarkMapAssignFillNoHint[string, string]))
+	b.Run("Key=smallType/Elem=int32", benchSizes(benchmarkMapAssignFillNoHint[smallType, int32]))
+	b.Run("Key=mediumType/Elem=int32", benchSizes(benchmarkMapAssignFillNoHint[mediumType, int32]))
+	b.Run("Key=bigType/Elem=int32", benchSizes(benchmarkMapAssignFillNoHint[bigType, int32]))
+	b.Run("Key=bigType/Elem=bigType", benchSizes(benchmarkMapAssignFillNoHint[bigType, bigType]))
+	b.Run("Key=int32/Elem=bigType", benchSizes(benchmarkMapAssignFillNoHint[int32, bigType]))
+	b.Run("Key=*int32/Elem=int32", benchSizes(benchmarkMapAssignFillNoHint[*int32, int32]))
+	b.Run("Key=int32/Elem=*int32", benchSizes(benchmarkMapAssignFillNoHint[int32, *int32]))
+}
+
+// Identical to benchmarkMapAssignFillNoHint, but additionally measures the
+// latency of each mapassign to report tail latency due to map grow.
+func benchmarkMapAssignGrowLatency[K mapBenchmarkKeyType, E mapBenchmarkElemType](b *testing.B, n int) {
+	if n == 0 {
+		b.Skip("can't create empty map via assignment")
+	}
+	checkAllocSize[K, E](b, n)
+	k := genValues[K](0, n)
+	e := genValues[E](0, n)
+
+	// Store the run time of each mapassign. Keeping the full data rather
+	// than a histogram provides higher precision. b.N tends to be <10M, so
+	// the memory requirement isn't too bad.
+	sample := make([]int64, b.N)
+
+	b.ResetTimer()
+
+	var m map[K]E
+	for i := 0; i < b.N; i++ {
+		if i%n == 0 {
+			m = make(map[K]E)
+		}
+		start := runtime.Nanotime()
+		m[k[i%n]] = e[i%n]
+		end := runtime.Nanotime()
+		sample[i] = end - start
+	}
+
+	b.StopTimer()
+
+	slices.Sort(sample)
+	// TODO(prattmic): Grow is so rare that even p99.99 often doesn't
+	// display a grow case. Switch to a more direct measure of grow cases
+	// only?
+	b.ReportMetric(float64(sample[int(float64(len(sample))*0.5)]), "p50-ns/op")
+	b.ReportMetric(float64(sample[int(float64(len(sample))*0.99)]), "p99-ns/op")
+	b.ReportMetric(float64(sample[int(float64(len(sample))*0.999)]), "p99.9-ns/op")
+	b.ReportMetric(float64(sample[int(float64(len(sample))*0.9999)]), "p99.99-ns/op")
+	b.ReportMetric(float64(sample[len(sample)-1]), "p100-ns/op")
+}
+
+func BenchmarkMapAssignGrowLatency(b *testing.B) {
+	b.Run("Key=int32/Elem=int32", benchSizes(benchmarkMapAssignGrowLatency[int32, int32]))
+	b.Run("Key=int64/Elem=int64", benchSizes(benchmarkMapAssignGrowLatency[int64, int64]))
+	b.Run("Key=string/Elem=string", benchSizes(benchmarkMapAssignGrowLatency[string, string]))
+	b.Run("Key=smallType/Elem=int32", benchSizes(benchmarkMapAssignGrowLatency[smallType, int32]))
+	b.Run("Key=mediumType/Elem=int32", benchSizes(benchmarkMapAssignGrowLatency[mediumType, int32]))
+	b.Run("Key=bigType/Elem=int32", benchSizes(benchmarkMapAssignGrowLatency[bigType, int32]))
+	b.Run("Key=bigType/Elem=bigType", benchSizes(benchmarkMapAssignGrowLatency[bigType, bigType]))
+	b.Run("Key=int32/Elem=bigType", benchSizes(benchmarkMapAssignGrowLatency[int32, bigType]))
+	b.Run("Key=*int32/Elem=int32", benchSizes(benchmarkMapAssignGrowLatency[*int32, int32]))
+	b.Run("Key=int32/Elem=*int32", benchSizes(benchmarkMapAssignGrowLatency[int32, *int32]))
+}
+
+// Fill a map of size n with size hint. Time is per-key. A new map is created
+// every n assignments.
+//
+// TODO(prattmic): Results don't make much sense if b.N < n.
+func benchmarkMapAssignFillHint[K mapBenchmarkKeyType, E mapBenchmarkElemType](b *testing.B, n int) {
+	if n == 0 {
+		b.Skip("can't create empty map via assignment")
+	}
+	checkAllocSize[K, E](b, n)
+	k := genValues[K](0, n)
+	e := genValues[E](0, n)
+	b.ResetTimer()
+
+	var m map[K]E
+	for i := 0; i < b.N; i++ {
+		if i%n == 0 {
+			m = make(map[K]E, n)
+		}
+		m[k[i%n]] = e[i%n]
+	}
+}
+
+func BenchmarkMapAssignFillHint(b *testing.B) {
+	b.Run("Key=int32/Elem=int32", benchSizes(benchmarkMapAssignFillHint[int32, int32]))
+	b.Run("Key=int64/Elem=int64", benchSizes(benchmarkMapAssignFillHint[int64, int64]))
+	b.Run("Key=string/Elem=string", benchSizes(benchmarkMapAssignFillHint[string, string]))
+	b.Run("Key=smallType/Elem=int32", benchSizes(benchmarkMapAssignFillHint[smallType, int32]))
+	b.Run("Key=mediumType/Elem=int32", benchSizes(benchmarkMapAssignFillHint[mediumType, int32]))
+	b.Run("Key=bigType/Elem=int32", benchSizes(benchmarkMapAssignFillHint[bigType, int32]))
+	b.Run("Key=bigType/Elem=bigType", benchSizes(benchmarkMapAssignFillHint[bigType, bigType]))
+	b.Run("Key=int32/Elem=bigType", benchSizes(benchmarkMapAssignFillHint[int32, bigType]))
+	b.Run("Key=*int32/Elem=int32", benchSizes(benchmarkMapAssignFillHint[*int32, int32]))
+	b.Run("Key=int32/Elem=*int32", benchSizes(benchmarkMapAssignFillHint[int32, *int32]))
+}
+
+// Fill a map of size n, reusing the same map. Time is per-key. The map is
+// cleared every n assignments.
+//
+// TODO(prattmic): Results don't make much sense if b.N < n.
+func benchmarkMapAssignFillClear[K mapBenchmarkKeyType, E mapBenchmarkElemType](b *testing.B, n int) {
+	if n == 0 {
+		b.Skip("can't create empty map via assignment")
+	}
+	checkAllocSize[K, E](b, n)
+	k := genValues[K](0, n)
+	e := genValues[E](0, n)
+	m := fillMap(k, e)
+	b.ResetTimer()
+
+	for i := 0; i < b.N; i++ {
+		if i%n == 0 {
+			clear(m)
+		}
+		m[k[i%n]] = e[i%n]
+	}
+}
+
+func BenchmarkMapAssignFillClear(b *testing.B) {
+	b.Run("Key=int32/Elem=int32", benchSizes(benchmarkMapAssignFillClear[int32, int32]))
+	b.Run("Key=int64/Elem=int64", benchSizes(benchmarkMapAssignFillClear[int64, int64]))
+	b.Run("Key=string/Elem=string", benchSizes(benchmarkMapAssignFillClear[string, string]))
+	b.Run("Key=smallType/Elem=int32", benchSizes(benchmarkMapAssignFillClear[smallType, int32]))
+	b.Run("Key=mediumType/Elem=int32", benchSizes(benchmarkMapAssignFillClear[mediumType, int32]))
+	b.Run("Key=bigType/Elem=int32", benchSizes(benchmarkMapAssignFillClear[bigType, int32]))
+	b.Run("Key=bigType/Elem=bigType", benchSizes(benchmarkMapAssignFillClear[bigType, bigType]))
+	b.Run("Key=int32/Elem=bigType", benchSizes(benchmarkMapAssignFillClear[int32, bigType]))
+	b.Run("Key=*int32/Elem=int32", benchSizes(benchmarkMapAssignFillClear[*int32, int32]))
+	b.Run("Key=int32/Elem=*int32", benchSizes(benchmarkMapAssignFillClear[int32, *int32]))
+}
+
+// Modify values using +=.
+func benchmarkMapAssignAddition[K mapBenchmarkKeyType, E int32 | int64 | string](b *testing.B, n int) {
+	if n == 0 {
+		b.Skip("can't modify empty map via assignment")
+	}
+	checkAllocSize[K, E](b, n)
+	k := genValues[K](0, n)
+	e := genValues[E](0, n)
+	m := fillMap(k, e)
+	b.ResetTimer()
+
+	for i := 0; i < b.N; i++ {
+		m[k[i%n]] += e[i%n]
+	}
+}
+
+func BenchmarkMapAssignAddition(b *testing.B) {
+	b.Run("Key=int32/Elem=int32", benchSizes(benchmarkMapAssignAddition[int32, int32]))
+	b.Run("Key=int64/Elem=int64", benchSizes(benchmarkMapAssignAddition[int64, int64]))
+	b.Run("Key=string/Elem=string", benchSizes(benchmarkMapAssignAddition[string, string]))
+	b.Run("Key=smallType/Elem=int32", benchSizes(benchmarkMapAssignAddition[smallType, int32]))
+	b.Run("Key=mediumType/Elem=int32", benchSizes(benchmarkMapAssignAddition[mediumType, int32]))
+	b.Run("Key=bigType/Elem=int32", benchSizes(benchmarkMapAssignAddition[bigType, int32]))
+}
+
+// Modify values append.
+func benchmarkMapAssignAppend[K mapBenchmarkKeyType](b *testing.B, n int) {
+	if n == 0 {
+		b.Skip("can't modify empty map via append")
+	}
+	checkAllocSize[K, []int32](b, n)
+	k := genValues[K](0, n)
+	e := genValues[[]int32](0, n)
+	m := fillMap(k, e)
+	b.ResetTimer()
+
+	for i := 0; i < b.N; i++ {
+		m[k[i%n]] = append(m[k[i%n]], e[i%n][0])
+	}
+}
+
+func BenchmarkMapAssignAppend(b *testing.B) {
+	b.Run("Key=int32/Elem=[]int32", benchSizes(benchmarkMapAssignAppend[int32]))
+	b.Run("Key=int64/Elem=[]int32", benchSizes(benchmarkMapAssignAppend[int64]))
+	b.Run("Key=string/Elem=[]int32", benchSizes(benchmarkMapAssignAppend[string]))
+}
+
+func benchmarkMapDelete[K mapBenchmarkKeyType, E mapBenchmarkElemType](b *testing.B, n int) {
+	if n == 0 {
+		b.Skip("can't delete from empty map")
+	}
+	checkAllocSize[K, E](b, n)
+	k := genValues[K](0, n)
+	e := genValues[E](0, n)
+	m := fillMap(k, e)
+	b.ResetTimer()
+
+	for i := 0; i < b.N; i++ {
+		if len(m) == 0 {
+			// We'd like to StopTimer while refilling the map, but
+			// it is way too expensive and thus makes the benchmark
+			// take a long time. See https://go.dev/issue/20875.
+			for j := range k {
+				m[k[j]] = e[j]
+			}
+		}
+		delete(m, k[i%n])
+	}
+}
+
+func BenchmarkMapDelete(b *testing.B) {
+	b.Run("Key=int32/Elem=int32", benchSizes(benchmarkMapDelete[int32, int32]))
+	b.Run("Key=int64/Elem=int64", benchSizes(benchmarkMapDelete[int64, int64]))
+	b.Run("Key=string/Elem=string", benchSizes(benchmarkMapDelete[string, string]))
+	b.Run("Key=smallType/Elem=int32", benchSizes(benchmarkMapDelete[smallType, int32]))
+	b.Run("Key=mediumType/Elem=int32", benchSizes(benchmarkMapDelete[mediumType, int32]))
+	b.Run("Key=bigType/Elem=int32", benchSizes(benchmarkMapDelete[bigType, int32]))
+	b.Run("Key=bigType/Elem=bigType", benchSizes(benchmarkMapDelete[bigType, bigType]))
+	b.Run("Key=int32/Elem=bigType", benchSizes(benchmarkMapDelete[int32, bigType]))
+	b.Run("Key=*int32/Elem=int32", benchSizes(benchmarkMapDelete[*int32, int32]))
+	b.Run("Key=int32/Elem=*int32", benchSizes(benchmarkMapDelete[int32, *int32]))
+}
+
+// Use iterator to pop an element. We want this to be fast, see
+// https://go.dev/issue/8412.
+func benchmarkMapPop[K mapBenchmarkKeyType, E mapBenchmarkElemType](b *testing.B, n int) {
+	if n == 0 {
+		b.Skip("can't delete from empty map")
+	}
+	checkAllocSize[K, E](b, n)
+	k := genValues[K](0, n)
+	e := genValues[E](0, n)
+	m := fillMap(k, e)
+	b.ResetTimer()
+
+	for i := 0; i < b.N; i++ {
+		if len(m) == 0 {
+			// We'd like to StopTimer while refilling the map, but
+			// it is way too expensive and thus makes the benchmark
+			// take a long time. See https://go.dev/issue/20875.
+			for j := range k {
+				m[k[j]] = e[j]
+			}
+		}
+		for key := range m {
+			delete(m, key)
+			break
+		}
+	}
+}
+
+func BenchmarkMapPop(b *testing.B) {
+	b.Run("Key=int32/Elem=int32", benchSizes(benchmarkMapPop[int32, int32]))
+	b.Run("Key=int64/Elem=int64", benchSizes(benchmarkMapPop[int64, int64]))
+	b.Run("Key=string/Elem=string", benchSizes(benchmarkMapPop[string, string]))
+	b.Run("Key=smallType/Elem=int32", benchSizes(benchmarkMapPop[smallType, int32]))
+	b.Run("Key=mediumType/Elem=int32", benchSizes(benchmarkMapPop[mediumType, int32]))
+	b.Run("Key=bigType/Elem=int32", benchSizes(benchmarkMapPop[bigType, int32]))
+	b.Run("Key=bigType/Elem=bigType", benchSizes(benchmarkMapPop[bigType, bigType]))
+	b.Run("Key=int32/Elem=bigType", benchSizes(benchmarkMapPop[int32, bigType]))
+	b.Run("Key=*int32/Elem=int32", benchSizes(benchmarkMapPop[*int32, int32]))
+	b.Run("Key=int32/Elem=*int32", benchSizes(benchmarkMapPop[int32, *int32]))
+}
+
+func BenchmarkMapDeleteLargeKey(b *testing.B) {
+	m := map[string]int{}
+	for i := range 9 {
+		m[fmt.Sprintf("%d", i)] = i
+	}
+	key := strings.Repeat("*", 10000)
+	for range b.N {
+		delete(m, key)
+	}
+}
+
+func BenchmarkMapSmallAccessHit(b *testing.B) {
+	b.Run("Key=int32/Elem=int32", smallBenchSizes(benchmarkMapAccessHit[int32, int32]))
+	b.Run("Key=int64/Elem=int64", smallBenchSizes(benchmarkMapAccessHit[int64, int64]))
+	b.Run("Key=string/Elem=string", smallBenchSizes(benchmarkMapAccessHit[string, string]))
+}
+func BenchmarkMapSmallAccessMiss(b *testing.B) {
+	b.Run("Key=int32/Elem=int32", smallBenchSizes(benchmarkMapAccessMiss[int32, int32]))
+	b.Run("Key=int64/Elem=int64", smallBenchSizes(benchmarkMapAccessMiss[int64, int64]))
+	b.Run("Key=string/Elem=string", smallBenchSizes(benchmarkMapAccessMiss[string, string]))
+}
diff --git a/src/runtime/map_fast32.go b/src/runtime/map_fast32_noswiss.go
similarity index 87%
rename from src/runtime/map_fast32.go
rename to src/runtime/map_fast32_noswiss.go
index 0eb8562f..751717b6 100644
--- a/src/runtime/map_fast32.go
+++ b/src/runtime/map_fast32_noswiss.go
@@ -2,17 +2,20 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build !goexperiment.swissmap
+
 package runtime
 
 import (
 	"internal/abi"
 	"internal/goarch"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
 func mapaccess1_fast32(t *maptype, h *hmap, key uint32) unsafe.Pointer {
 	if raceenabled && h != nil {
-		callerpc := getcallerpc()
+		callerpc := sys.GetCallerPC()
 		racereadpc(unsafe.Pointer(h), callerpc, abi.FuncPCABIInternal(mapaccess1_fast32))
 	}
 	if h == nil || h.count == 0 {
@@ -41,9 +44,9 @@ func mapaccess1_fast32(t *maptype, h *hmap, key uint32) unsafe.Pointer {
 		}
 	}
 	for ; b != nil; b = b.overflow(t) {
-		for i, k := uintptr(0), b.keys(); i < abi.MapBucketCount; i, k = i+1, add(k, 4) {
+		for i, k := uintptr(0), b.keys(); i < abi.OldMapBucketCount; i, k = i+1, add(k, 4) {
 			if *(*uint32)(k) == key && !isEmpty(b.tophash[i]) {
-				return add(unsafe.Pointer(b), dataOffset+abi.MapBucketCount*4+i*uintptr(t.ValueSize))
+				return add(unsafe.Pointer(b), dataOffset+abi.OldMapBucketCount*4+i*uintptr(t.ValueSize))
 			}
 		}
 	}
@@ -61,7 +64,7 @@ func mapaccess1_fast32(t *maptype, h *hmap, key uint32) unsafe.Pointer {
 //go:linkname mapaccess2_fast32
 func mapaccess2_fast32(t *maptype, h *hmap, key uint32) (unsafe.Pointer, bool) {
 	if raceenabled && h != nil {
-		callerpc := getcallerpc()
+		callerpc := sys.GetCallerPC()
 		racereadpc(unsafe.Pointer(h), callerpc, abi.FuncPCABIInternal(mapaccess2_fast32))
 	}
 	if h == nil || h.count == 0 {
@@ -90,9 +93,9 @@ func mapaccess2_fast32(t *maptype, h *hmap, key uint32) (unsafe.Pointer, bool) {
 		}
 	}
 	for ; b != nil; b = b.overflow(t) {
-		for i, k := uintptr(0), b.keys(); i < abi.MapBucketCount; i, k = i+1, add(k, 4) {
+		for i, k := uintptr(0), b.keys(); i < abi.OldMapBucketCount; i, k = i+1, add(k, 4) {
 			if *(*uint32)(k) == key && !isEmpty(b.tophash[i]) {
-				return add(unsafe.Pointer(b), dataOffset+abi.MapBucketCount*4+i*uintptr(t.ValueSize)), true
+				return add(unsafe.Pointer(b), dataOffset+abi.OldMapBucketCount*4+i*uintptr(t.ValueSize)), true
 			}
 		}
 	}
@@ -103,7 +106,6 @@ func mapaccess2_fast32(t *maptype, h *hmap, key uint32) (unsafe.Pointer, bool) {
 // but widely used packages access it using linkname.
 // Notable members of the hall of shame include:
 //   - github.com/bytedance/sonic
-//   - github.com/cloudwego/frugal
 //   - github.com/ugorji/go/codec
 //
 // Do not remove or change the type signature.
@@ -115,7 +117,7 @@ func mapassign_fast32(t *maptype, h *hmap, key uint32) unsafe.Pointer {
 		panic(plainError("assignment to entry in nil map"))
 	}
 	if raceenabled {
-		callerpc := getcallerpc()
+		callerpc := sys.GetCallerPC()
 		racewritepc(unsafe.Pointer(h), callerpc, abi.FuncPCABIInternal(mapassign_fast32))
 	}
 	if h.flags&hashWriting != 0 {
@@ -143,7 +145,7 @@ again:
 
 bucketloop:
 	for {
-		for i := uintptr(0); i < abi.MapBucketCount; i++ {
+		for i := uintptr(0); i < abi.OldMapBucketCount; i++ {
 			if isEmpty(b.tophash[i]) {
 				if insertb == nil {
 					inserti = i
@@ -183,7 +185,7 @@ bucketloop:
 		insertb = h.newoverflow(t, b)
 		inserti = 0 // not necessary, but avoids needlessly spilling inserti
 	}
-	insertb.tophash[inserti&(abi.MapBucketCount-1)] = tophash(hash) // mask inserti to avoid bounds checks
+	insertb.tophash[inserti&(abi.OldMapBucketCount-1)] = tophash(hash) // mask inserti to avoid bounds checks
 
 	insertk = add(unsafe.Pointer(insertb), dataOffset+inserti*4)
 	// store new key at insert position
@@ -192,7 +194,7 @@ bucketloop:
 	h.count++
 
 done:
-	elem := add(unsafe.Pointer(insertb), dataOffset+abi.MapBucketCount*4+inserti*uintptr(t.ValueSize))
+	elem := add(unsafe.Pointer(insertb), dataOffset+abi.OldMapBucketCount*4+inserti*uintptr(t.ValueSize))
 	if h.flags&hashWriting == 0 {
 		fatal("concurrent map writes")
 	}
@@ -214,7 +216,7 @@ func mapassign_fast32ptr(t *maptype, h *hmap, key unsafe.Pointer) unsafe.Pointer
 		panic(plainError("assignment to entry in nil map"))
 	}
 	if raceenabled {
-		callerpc := getcallerpc()
+		callerpc := sys.GetCallerPC()
 		racewritepc(unsafe.Pointer(h), callerpc, abi.FuncPCABIInternal(mapassign_fast32))
 	}
 	if h.flags&hashWriting != 0 {
@@ -242,7 +244,7 @@ again:
 
 bucketloop:
 	for {
-		for i := uintptr(0); i < abi.MapBucketCount; i++ {
+		for i := uintptr(0); i < abi.OldMapBucketCount; i++ {
 			if isEmpty(b.tophash[i]) {
 				if insertb == nil {
 					inserti = i
@@ -282,7 +284,7 @@ bucketloop:
 		insertb = h.newoverflow(t, b)
 		inserti = 0 // not necessary, but avoids needlessly spilling inserti
 	}
-	insertb.tophash[inserti&(abi.MapBucketCount-1)] = tophash(hash) // mask inserti to avoid bounds checks
+	insertb.tophash[inserti&(abi.OldMapBucketCount-1)] = tophash(hash) // mask inserti to avoid bounds checks
 
 	insertk = add(unsafe.Pointer(insertb), dataOffset+inserti*4)
 	// store new key at insert position
@@ -291,7 +293,7 @@ bucketloop:
 	h.count++
 
 done:
-	elem := add(unsafe.Pointer(insertb), dataOffset+abi.MapBucketCount*4+inserti*uintptr(t.ValueSize))
+	elem := add(unsafe.Pointer(insertb), dataOffset+abi.OldMapBucketCount*4+inserti*uintptr(t.ValueSize))
 	if h.flags&hashWriting == 0 {
 		fatal("concurrent map writes")
 	}
@@ -301,7 +303,7 @@ done:
 
 func mapdelete_fast32(t *maptype, h *hmap, key uint32) {
 	if raceenabled && h != nil {
-		callerpc := getcallerpc()
+		callerpc := sys.GetCallerPC()
 		racewritepc(unsafe.Pointer(h), callerpc, abi.FuncPCABIInternal(mapdelete_fast32))
 	}
 	if h == nil || h.count == 0 {
@@ -324,7 +326,7 @@ func mapdelete_fast32(t *maptype, h *hmap, key uint32) {
 	bOrig := b
 search:
 	for ; b != nil; b = b.overflow(t) {
-		for i, k := uintptr(0), b.keys(); i < abi.MapBucketCount; i, k = i+1, add(k, 4) {
+		for i, k := uintptr(0), b.keys(); i < abi.OldMapBucketCount; i, k = i+1, add(k, 4) {
 			if key != *(*uint32)(k) || isEmpty(b.tophash[i]) {
 				continue
 			}
@@ -336,7 +338,7 @@ search:
 				// 32 bits wide and the key is 32 bits wide also.
 				*(*unsafe.Pointer)(k) = nil
 			}
-			e := add(unsafe.Pointer(b), dataOffset+abi.MapBucketCount*4+i*uintptr(t.ValueSize))
+			e := add(unsafe.Pointer(b), dataOffset+abi.OldMapBucketCount*4+i*uintptr(t.ValueSize))
 			if t.Elem.Pointers() {
 				memclrHasPointers(e, t.Elem.Size_)
 			} else {
@@ -345,7 +347,7 @@ search:
 			b.tophash[i] = emptyOne
 			// If the bucket now ends in a bunch of emptyOne states,
 			// change those to emptyRest states.
-			if i == abi.MapBucketCount-1 {
+			if i == abi.OldMapBucketCount-1 {
 				if b.overflow(t) != nil && b.overflow(t).tophash[0] != emptyRest {
 					goto notLast
 				}
@@ -364,7 +366,7 @@ search:
 					c := b
 					for b = bOrig; b.overflow(t) != c; b = b.overflow(t) {
 					}
-					i = abi.MapBucketCount - 1
+					i = abi.OldMapBucketCount - 1
 				} else {
 					i--
 				}
@@ -412,7 +414,7 @@ func evacuate_fast32(t *maptype, h *hmap, oldbucket uintptr) {
 		x := &xy[0]
 		x.b = (*bmap)(add(h.buckets, oldbucket*uintptr(t.BucketSize)))
 		x.k = add(unsafe.Pointer(x.b), dataOffset)
-		x.e = add(x.k, abi.MapBucketCount*4)
+		x.e = add(x.k, abi.OldMapBucketCount*4)
 
 		if !h.sameSizeGrow() {
 			// Only calculate y pointers if we're growing bigger.
@@ -420,13 +422,13 @@ func evacuate_fast32(t *maptype, h *hmap, oldbucket uintptr) {
 			y := &xy[1]
 			y.b = (*bmap)(add(h.buckets, (oldbucket+newbit)*uintptr(t.BucketSize)))
 			y.k = add(unsafe.Pointer(y.b), dataOffset)
-			y.e = add(y.k, abi.MapBucketCount*4)
+			y.e = add(y.k, abi.OldMapBucketCount*4)
 		}
 
 		for ; b != nil; b = b.overflow(t) {
 			k := add(unsafe.Pointer(b), dataOffset)
-			e := add(k, abi.MapBucketCount*4)
-			for i := 0; i < abi.MapBucketCount; i, k, e = i+1, add(k, 4), add(e, uintptr(t.ValueSize)) {
+			e := add(k, abi.OldMapBucketCount*4)
+			for i := 0; i < abi.OldMapBucketCount; i, k, e = i+1, add(k, 4), add(e, uintptr(t.ValueSize)) {
 				top := b.tophash[i]
 				if isEmpty(top) {
 					b.tophash[i] = evacuatedEmpty
@@ -448,13 +450,13 @@ func evacuate_fast32(t *maptype, h *hmap, oldbucket uintptr) {
 				b.tophash[i] = evacuatedX + useY // evacuatedX + 1 == evacuatedY, enforced in makemap
 				dst := &xy[useY]                 // evacuation destination
 
-				if dst.i == abi.MapBucketCount {
+				if dst.i == abi.OldMapBucketCount {
 					dst.b = h.newoverflow(t, dst.b)
 					dst.i = 0
 					dst.k = add(unsafe.Pointer(dst.b), dataOffset)
-					dst.e = add(dst.k, abi.MapBucketCount*4)
+					dst.e = add(dst.k, abi.OldMapBucketCount*4)
 				}
-				dst.b.tophash[dst.i&(abi.MapBucketCount-1)] = top // mask dst.i as an optimization, to avoid a bounds check
+				dst.b.tophash[dst.i&(abi.OldMapBucketCount-1)] = top // mask dst.i as an optimization, to avoid a bounds check
 
 				// Copy key.
 				if goarch.PtrSize == 4 && t.Key.Pointers() && writeBarrier.enabled {
diff --git a/src/runtime/map_fast32_swiss.go b/src/runtime/map_fast32_swiss.go
new file mode 100644
index 00000000..0a241d37
--- /dev/null
+++ b/src/runtime/map_fast32_swiss.go
@@ -0,0 +1,55 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build goexperiment.swissmap
+
+package runtime
+
+import (
+	"internal/abi"
+	"internal/runtime/maps"
+	"unsafe"
+)
+
+// Functions below pushed from internal/runtime/maps.
+
+//go:linkname mapaccess1_fast32
+func mapaccess1_fast32(t *abi.SwissMapType, m *maps.Map, key uint32) unsafe.Pointer
+
+// mapaccess2_fast32 should be an internal detail,
+// but widely used packages access it using linkname.
+// Notable members of the hall of shame include:
+//   - github.com/ugorji/go/codec
+//
+// Do not remove or change the type signature.
+// See go.dev/issue/67401.
+//
+//go:linkname mapaccess2_fast32
+func mapaccess2_fast32(t *abi.SwissMapType, m *maps.Map, key uint32) (unsafe.Pointer, bool)
+
+// mapassign_fast32 should be an internal detail,
+// but widely used packages access it using linkname.
+// Notable members of the hall of shame include:
+//   - github.com/bytedance/sonic
+//   - github.com/ugorji/go/codec
+//
+// Do not remove or change the type signature.
+// See go.dev/issue/67401.
+//
+//go:linkname mapassign_fast32
+func mapassign_fast32(t *abi.SwissMapType, m *maps.Map, key uint32) unsafe.Pointer
+
+// mapassign_fast32ptr should be an internal detail,
+// but widely used packages access it using linkname.
+// Notable members of the hall of shame include:
+//   - github.com/ugorji/go/codec
+//
+// Do not remove or change the type signature.
+// See go.dev/issue/67401.
+//
+//go:linkname mapassign_fast32ptr
+func mapassign_fast32ptr(t *abi.SwissMapType, m *maps.Map, key unsafe.Pointer) unsafe.Pointer
+
+//go:linkname mapdelete_fast32
+func mapdelete_fast32(t *abi.SwissMapType, m *maps.Map, key uint32)
diff --git a/src/runtime/map_fast64.go b/src/runtime/map_fast64_noswiss.go
similarity index 87%
rename from src/runtime/map_fast64.go
rename to src/runtime/map_fast64_noswiss.go
index aca60eb2..abb272d2 100644
--- a/src/runtime/map_fast64.go
+++ b/src/runtime/map_fast64_noswiss.go
@@ -2,17 +2,20 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build !goexperiment.swissmap
+
 package runtime
 
 import (
 	"internal/abi"
 	"internal/goarch"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
 func mapaccess1_fast64(t *maptype, h *hmap, key uint64) unsafe.Pointer {
 	if raceenabled && h != nil {
-		callerpc := getcallerpc()
+		callerpc := sys.GetCallerPC()
 		racereadpc(unsafe.Pointer(h), callerpc, abi.FuncPCABIInternal(mapaccess1_fast64))
 	}
 	if h == nil || h.count == 0 {
@@ -41,9 +44,9 @@ func mapaccess1_fast64(t *maptype, h *hmap, key uint64) unsafe.Pointer {
 		}
 	}
 	for ; b != nil; b = b.overflow(t) {
-		for i, k := uintptr(0), b.keys(); i < abi.MapBucketCount; i, k = i+1, add(k, 8) {
+		for i, k := uintptr(0), b.keys(); i < abi.OldMapBucketCount; i, k = i+1, add(k, 8) {
 			if *(*uint64)(k) == key && !isEmpty(b.tophash[i]) {
-				return add(unsafe.Pointer(b), dataOffset+abi.MapBucketCount*8+i*uintptr(t.ValueSize))
+				return add(unsafe.Pointer(b), dataOffset+abi.OldMapBucketCount*8+i*uintptr(t.ValueSize))
 			}
 		}
 	}
@@ -61,7 +64,7 @@ func mapaccess1_fast64(t *maptype, h *hmap, key uint64) unsafe.Pointer {
 //go:linkname mapaccess2_fast64
 func mapaccess2_fast64(t *maptype, h *hmap, key uint64) (unsafe.Pointer, bool) {
 	if raceenabled && h != nil {
-		callerpc := getcallerpc()
+		callerpc := sys.GetCallerPC()
 		racereadpc(unsafe.Pointer(h), callerpc, abi.FuncPCABIInternal(mapaccess2_fast64))
 	}
 	if h == nil || h.count == 0 {
@@ -90,9 +93,9 @@ func mapaccess2_fast64(t *maptype, h *hmap, key uint64) (unsafe.Pointer, bool) {
 		}
 	}
 	for ; b != nil; b = b.overflow(t) {
-		for i, k := uintptr(0), b.keys(); i < abi.MapBucketCount; i, k = i+1, add(k, 8) {
+		for i, k := uintptr(0), b.keys(); i < abi.OldMapBucketCount; i, k = i+1, add(k, 8) {
 			if *(*uint64)(k) == key && !isEmpty(b.tophash[i]) {
-				return add(unsafe.Pointer(b), dataOffset+abi.MapBucketCount*8+i*uintptr(t.ValueSize)), true
+				return add(unsafe.Pointer(b), dataOffset+abi.OldMapBucketCount*8+i*uintptr(t.ValueSize)), true
 			}
 		}
 	}
@@ -103,7 +106,6 @@ func mapaccess2_fast64(t *maptype, h *hmap, key uint64) (unsafe.Pointer, bool) {
 // but widely used packages access it using linkname.
 // Notable members of the hall of shame include:
 //   - github.com/bytedance/sonic
-//   - github.com/cloudwego/frugal
 //   - github.com/ugorji/go/codec
 //
 // Do not remove or change the type signature.
@@ -115,7 +117,7 @@ func mapassign_fast64(t *maptype, h *hmap, key uint64) unsafe.Pointer {
 		panic(plainError("assignment to entry in nil map"))
 	}
 	if raceenabled {
-		callerpc := getcallerpc()
+		callerpc := sys.GetCallerPC()
 		racewritepc(unsafe.Pointer(h), callerpc, abi.FuncPCABIInternal(mapassign_fast64))
 	}
 	if h.flags&hashWriting != 0 {
@@ -143,7 +145,7 @@ again:
 
 bucketloop:
 	for {
-		for i := uintptr(0); i < abi.MapBucketCount; i++ {
+		for i := uintptr(0); i < abi.OldMapBucketCount; i++ {
 			if isEmpty(b.tophash[i]) {
 				if insertb == nil {
 					insertb = b
@@ -183,7 +185,7 @@ bucketloop:
 		insertb = h.newoverflow(t, b)
 		inserti = 0 // not necessary, but avoids needlessly spilling inserti
 	}
-	insertb.tophash[inserti&(abi.MapBucketCount-1)] = tophash(hash) // mask inserti to avoid bounds checks
+	insertb.tophash[inserti&(abi.OldMapBucketCount-1)] = tophash(hash) // mask inserti to avoid bounds checks
 
 	insertk = add(unsafe.Pointer(insertb), dataOffset+inserti*8)
 	// store new key at insert position
@@ -192,7 +194,7 @@ bucketloop:
 	h.count++
 
 done:
-	elem := add(unsafe.Pointer(insertb), dataOffset+abi.MapBucketCount*8+inserti*uintptr(t.ValueSize))
+	elem := add(unsafe.Pointer(insertb), dataOffset+abi.OldMapBucketCount*8+inserti*uintptr(t.ValueSize))
 	if h.flags&hashWriting == 0 {
 		fatal("concurrent map writes")
 	}
@@ -204,7 +206,6 @@ done:
 // but widely used packages access it using linkname.
 // Notable members of the hall of shame include:
 //   - github.com/bytedance/sonic
-//   - github.com/cloudwego/frugal
 //   - github.com/ugorji/go/codec
 //
 // Do not remove or change the type signature.
@@ -216,7 +217,7 @@ func mapassign_fast64ptr(t *maptype, h *hmap, key unsafe.Pointer) unsafe.Pointer
 		panic(plainError("assignment to entry in nil map"))
 	}
 	if raceenabled {
-		callerpc := getcallerpc()
+		callerpc := sys.GetCallerPC()
 		racewritepc(unsafe.Pointer(h), callerpc, abi.FuncPCABIInternal(mapassign_fast64))
 	}
 	if h.flags&hashWriting != 0 {
@@ -244,7 +245,7 @@ again:
 
 bucketloop:
 	for {
-		for i := uintptr(0); i < abi.MapBucketCount; i++ {
+		for i := uintptr(0); i < abi.OldMapBucketCount; i++ {
 			if isEmpty(b.tophash[i]) {
 				if insertb == nil {
 					insertb = b
@@ -284,7 +285,7 @@ bucketloop:
 		insertb = h.newoverflow(t, b)
 		inserti = 0 // not necessary, but avoids needlessly spilling inserti
 	}
-	insertb.tophash[inserti&(abi.MapBucketCount-1)] = tophash(hash) // mask inserti to avoid bounds checks
+	insertb.tophash[inserti&(abi.OldMapBucketCount-1)] = tophash(hash) // mask inserti to avoid bounds checks
 
 	insertk = add(unsafe.Pointer(insertb), dataOffset+inserti*8)
 	// store new key at insert position
@@ -293,7 +294,7 @@ bucketloop:
 	h.count++
 
 done:
-	elem := add(unsafe.Pointer(insertb), dataOffset+abi.MapBucketCount*8+inserti*uintptr(t.ValueSize))
+	elem := add(unsafe.Pointer(insertb), dataOffset+abi.OldMapBucketCount*8+inserti*uintptr(t.ValueSize))
 	if h.flags&hashWriting == 0 {
 		fatal("concurrent map writes")
 	}
@@ -303,7 +304,7 @@ done:
 
 func mapdelete_fast64(t *maptype, h *hmap, key uint64) {
 	if raceenabled && h != nil {
-		callerpc := getcallerpc()
+		callerpc := sys.GetCallerPC()
 		racewritepc(unsafe.Pointer(h), callerpc, abi.FuncPCABIInternal(mapdelete_fast64))
 	}
 	if h == nil || h.count == 0 {
@@ -326,7 +327,7 @@ func mapdelete_fast64(t *maptype, h *hmap, key uint64) {
 	bOrig := b
 search:
 	for ; b != nil; b = b.overflow(t) {
-		for i, k := uintptr(0), b.keys(); i < abi.MapBucketCount; i, k = i+1, add(k, 8) {
+		for i, k := uintptr(0), b.keys(); i < abi.OldMapBucketCount; i, k = i+1, add(k, 8) {
 			if key != *(*uint64)(k) || isEmpty(b.tophash[i]) {
 				continue
 			}
@@ -340,7 +341,7 @@ search:
 					memclrHasPointers(k, 8)
 				}
 			}
-			e := add(unsafe.Pointer(b), dataOffset+abi.MapBucketCount*8+i*uintptr(t.ValueSize))
+			e := add(unsafe.Pointer(b), dataOffset+abi.OldMapBucketCount*8+i*uintptr(t.ValueSize))
 			if t.Elem.Pointers() {
 				memclrHasPointers(e, t.Elem.Size_)
 			} else {
@@ -349,7 +350,7 @@ search:
 			b.tophash[i] = emptyOne
 			// If the bucket now ends in a bunch of emptyOne states,
 			// change those to emptyRest states.
-			if i == abi.MapBucketCount-1 {
+			if i == abi.OldMapBucketCount-1 {
 				if b.overflow(t) != nil && b.overflow(t).tophash[0] != emptyRest {
 					goto notLast
 				}
@@ -368,7 +369,7 @@ search:
 					c := b
 					for b = bOrig; b.overflow(t) != c; b = b.overflow(t) {
 					}
-					i = abi.MapBucketCount - 1
+					i = abi.OldMapBucketCount - 1
 				} else {
 					i--
 				}
@@ -416,7 +417,7 @@ func evacuate_fast64(t *maptype, h *hmap, oldbucket uintptr) {
 		x := &xy[0]
 		x.b = (*bmap)(add(h.buckets, oldbucket*uintptr(t.BucketSize)))
 		x.k = add(unsafe.Pointer(x.b), dataOffset)
-		x.e = add(x.k, abi.MapBucketCount*8)
+		x.e = add(x.k, abi.OldMapBucketCount*8)
 
 		if !h.sameSizeGrow() {
 			// Only calculate y pointers if we're growing bigger.
@@ -424,13 +425,13 @@ func evacuate_fast64(t *maptype, h *hmap, oldbucket uintptr) {
 			y := &xy[1]
 			y.b = (*bmap)(add(h.buckets, (oldbucket+newbit)*uintptr(t.BucketSize)))
 			y.k = add(unsafe.Pointer(y.b), dataOffset)
-			y.e = add(y.k, abi.MapBucketCount*8)
+			y.e = add(y.k, abi.OldMapBucketCount*8)
 		}
 
 		for ; b != nil; b = b.overflow(t) {
 			k := add(unsafe.Pointer(b), dataOffset)
-			e := add(k, abi.MapBucketCount*8)
-			for i := 0; i < abi.MapBucketCount; i, k, e = i+1, add(k, 8), add(e, uintptr(t.ValueSize)) {
+			e := add(k, abi.OldMapBucketCount*8)
+			for i := 0; i < abi.OldMapBucketCount; i, k, e = i+1, add(k, 8), add(e, uintptr(t.ValueSize)) {
 				top := b.tophash[i]
 				if isEmpty(top) {
 					b.tophash[i] = evacuatedEmpty
@@ -452,13 +453,13 @@ func evacuate_fast64(t *maptype, h *hmap, oldbucket uintptr) {
 				b.tophash[i] = evacuatedX + useY // evacuatedX + 1 == evacuatedY, enforced in makemap
 				dst := &xy[useY]                 // evacuation destination
 
-				if dst.i == abi.MapBucketCount {
+				if dst.i == abi.OldMapBucketCount {
 					dst.b = h.newoverflow(t, dst.b)
 					dst.i = 0
 					dst.k = add(unsafe.Pointer(dst.b), dataOffset)
-					dst.e = add(dst.k, abi.MapBucketCount*8)
+					dst.e = add(dst.k, abi.OldMapBucketCount*8)
 				}
-				dst.b.tophash[dst.i&(abi.MapBucketCount-1)] = top // mask dst.i as an optimization, to avoid a bounds check
+				dst.b.tophash[dst.i&(abi.OldMapBucketCount-1)] = top // mask dst.i as an optimization, to avoid a bounds check
 
 				// Copy key.
 				if t.Key.Pointers() && writeBarrier.enabled {
diff --git a/src/runtime/map_fast64_swiss.go b/src/runtime/map_fast64_swiss.go
new file mode 100644
index 00000000..8b7fcf88
--- /dev/null
+++ b/src/runtime/map_fast64_swiss.go
@@ -0,0 +1,56 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build goexperiment.swissmap
+
+package runtime
+
+import (
+	"internal/abi"
+	"internal/runtime/maps"
+	"unsafe"
+)
+
+// Functions below pushed from internal/runtime/maps.
+
+//go:linkname mapaccess1_fast64
+func mapaccess1_fast64(t *abi.SwissMapType, m *maps.Map, key uint64) unsafe.Pointer
+
+// mapaccess2_fast64 should be an internal detail,
+// but widely used packages access it using linkname.
+// Notable members of the hall of shame include:
+//   - github.com/ugorji/go/codec
+//
+// Do not remove or change the type signature.
+// See go.dev/issue/67401.
+//
+//go:linkname mapaccess2_fast64
+func mapaccess2_fast64(t *abi.SwissMapType, m *maps.Map, key uint64) (unsafe.Pointer, bool)
+
+// mapassign_fast64 should be an internal detail,
+// but widely used packages access it using linkname.
+// Notable members of the hall of shame include:
+//   - github.com/bytedance/sonic
+//   - github.com/ugorji/go/codec
+//
+// Do not remove or change the type signature.
+// See go.dev/issue/67401.
+//
+//go:linkname mapassign_fast64
+func mapassign_fast64(t *abi.SwissMapType, m *maps.Map, key uint64) unsafe.Pointer
+
+// mapassign_fast64ptr should be an internal detail,
+// but widely used packages access it using linkname.
+// Notable members of the hall of shame include:
+//   - github.com/bytedance/sonic
+//   - github.com/ugorji/go/codec
+//
+// Do not remove or change the type signature.
+// See go.dev/issue/67401.
+//
+//go:linkname mapassign_fast64ptr
+func mapassign_fast64ptr(t *abi.SwissMapType, m *maps.Map, key unsafe.Pointer) unsafe.Pointer
+
+//go:linkname mapdelete_fast64
+func mapdelete_fast64(t *abi.SwissMapType, m *maps.Map, key uint64)
diff --git a/src/runtime/map_faststr.go b/src/runtime/map_faststr_noswiss.go
similarity index 80%
rename from src/runtime/map_faststr.go
rename to src/runtime/map_faststr_noswiss.go
index 5461a9f8..e8b6a3f1 100644
--- a/src/runtime/map_faststr.go
+++ b/src/runtime/map_faststr_noswiss.go
@@ -2,17 +2,20 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build !goexperiment.swissmap
+
 package runtime
 
 import (
 	"internal/abi"
 	"internal/goarch"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
 func mapaccess1_faststr(t *maptype, h *hmap, ky string) unsafe.Pointer {
 	if raceenabled && h != nil {
-		callerpc := getcallerpc()
+		callerpc := sys.GetCallerPC()
 		racereadpc(unsafe.Pointer(h), callerpc, abi.FuncPCABIInternal(mapaccess1_faststr))
 	}
 	if h == nil || h.count == 0 {
@@ -27,7 +30,7 @@ func mapaccess1_faststr(t *maptype, h *hmap, ky string) unsafe.Pointer {
 		b := (*bmap)(h.buckets)
 		if key.len < 32 {
 			// short key, doing lots of comparisons is ok
-			for i, kptr := uintptr(0), b.keys(); i < abi.MapBucketCount; i, kptr = i+1, add(kptr, 2*goarch.PtrSize) {
+			for i, kptr := uintptr(0), b.keys(); i < abi.OldMapBucketCount; i, kptr = i+1, add(kptr, 2*goarch.PtrSize) {
 				k := (*stringStruct)(kptr)
 				if k.len != key.len || isEmpty(b.tophash[i]) {
 					if b.tophash[i] == emptyRest {
@@ -36,14 +39,14 @@ func mapaccess1_faststr(t *maptype, h *hmap, ky string) unsafe.Pointer {
 					continue
 				}
 				if k.str == key.str || memequal(k.str, key.str, uintptr(key.len)) {
-					return add(unsafe.Pointer(b), dataOffset+abi.MapBucketCount*2*goarch.PtrSize+i*uintptr(t.ValueSize))
+					return add(unsafe.Pointer(b), dataOffset+abi.OldMapBucketCount*2*goarch.PtrSize+i*uintptr(t.ValueSize))
 				}
 			}
 			return unsafe.Pointer(&zeroVal[0])
 		}
 		// long key, try not to do more comparisons than necessary
-		keymaybe := uintptr(abi.MapBucketCount)
-		for i, kptr := uintptr(0), b.keys(); i < abi.MapBucketCount; i, kptr = i+1, add(kptr, 2*goarch.PtrSize) {
+		keymaybe := uintptr(abi.OldMapBucketCount)
+		for i, kptr := uintptr(0), b.keys(); i < abi.OldMapBucketCount; i, kptr = i+1, add(kptr, 2*goarch.PtrSize) {
 			k := (*stringStruct)(kptr)
 			if k.len != key.len || isEmpty(b.tophash[i]) {
 				if b.tophash[i] == emptyRest {
@@ -52,7 +55,7 @@ func mapaccess1_faststr(t *maptype, h *hmap, ky string) unsafe.Pointer {
 				continue
 			}
 			if k.str == key.str {
-				return add(unsafe.Pointer(b), dataOffset+abi.MapBucketCount*2*goarch.PtrSize+i*uintptr(t.ValueSize))
+				return add(unsafe.Pointer(b), dataOffset+abi.OldMapBucketCount*2*goarch.PtrSize+i*uintptr(t.ValueSize))
 			}
 			// check first 4 bytes
 			if *((*[4]byte)(key.str)) != *((*[4]byte)(k.str)) {
@@ -62,16 +65,16 @@ func mapaccess1_faststr(t *maptype, h *hmap, ky string) unsafe.Pointer {
 			if *((*[4]byte)(add(key.str, uintptr(key.len)-4))) != *((*[4]byte)(add(k.str, uintptr(key.len)-4))) {
 				continue
 			}
-			if keymaybe != abi.MapBucketCount {
+			if keymaybe != abi.OldMapBucketCount {
 				// Two keys are potential matches. Use hash to distinguish them.
 				goto dohash
 			}
 			keymaybe = i
 		}
-		if keymaybe != abi.MapBucketCount {
+		if keymaybe != abi.OldMapBucketCount {
 			k := (*stringStruct)(add(unsafe.Pointer(b), dataOffset+keymaybe*2*goarch.PtrSize))
 			if memequal(k.str, key.str, uintptr(key.len)) {
-				return add(unsafe.Pointer(b), dataOffset+abi.MapBucketCount*2*goarch.PtrSize+keymaybe*uintptr(t.ValueSize))
+				return add(unsafe.Pointer(b), dataOffset+abi.OldMapBucketCount*2*goarch.PtrSize+keymaybe*uintptr(t.ValueSize))
 			}
 		}
 		return unsafe.Pointer(&zeroVal[0])
@@ -92,13 +95,13 @@ dohash:
 	}
 	top := tophash(hash)
 	for ; b != nil; b = b.overflow(t) {
-		for i, kptr := uintptr(0), b.keys(); i < abi.MapBucketCount; i, kptr = i+1, add(kptr, 2*goarch.PtrSize) {
+		for i, kptr := uintptr(0), b.keys(); i < abi.OldMapBucketCount; i, kptr = i+1, add(kptr, 2*goarch.PtrSize) {
 			k := (*stringStruct)(kptr)
 			if k.len != key.len || b.tophash[i] != top {
 				continue
 			}
 			if k.str == key.str || memequal(k.str, key.str, uintptr(key.len)) {
-				return add(unsafe.Pointer(b), dataOffset+abi.MapBucketCount*2*goarch.PtrSize+i*uintptr(t.ValueSize))
+				return add(unsafe.Pointer(b), dataOffset+abi.OldMapBucketCount*2*goarch.PtrSize+i*uintptr(t.ValueSize))
 			}
 		}
 	}
@@ -116,7 +119,7 @@ dohash:
 //go:linkname mapaccess2_faststr
 func mapaccess2_faststr(t *maptype, h *hmap, ky string) (unsafe.Pointer, bool) {
 	if raceenabled && h != nil {
-		callerpc := getcallerpc()
+		callerpc := sys.GetCallerPC()
 		racereadpc(unsafe.Pointer(h), callerpc, abi.FuncPCABIInternal(mapaccess2_faststr))
 	}
 	if h == nil || h.count == 0 {
@@ -131,7 +134,7 @@ func mapaccess2_faststr(t *maptype, h *hmap, ky string) (unsafe.Pointer, bool) {
 		b := (*bmap)(h.buckets)
 		if key.len < 32 {
 			// short key, doing lots of comparisons is ok
-			for i, kptr := uintptr(0), b.keys(); i < abi.MapBucketCount; i, kptr = i+1, add(kptr, 2*goarch.PtrSize) {
+			for i, kptr := uintptr(0), b.keys(); i < abi.OldMapBucketCount; i, kptr = i+1, add(kptr, 2*goarch.PtrSize) {
 				k := (*stringStruct)(kptr)
 				if k.len != key.len || isEmpty(b.tophash[i]) {
 					if b.tophash[i] == emptyRest {
@@ -140,14 +143,14 @@ func mapaccess2_faststr(t *maptype, h *hmap, ky string) (unsafe.Pointer, bool) {
 					continue
 				}
 				if k.str == key.str || memequal(k.str, key.str, uintptr(key.len)) {
-					return add(unsafe.Pointer(b), dataOffset+abi.MapBucketCount*2*goarch.PtrSize+i*uintptr(t.ValueSize)), true
+					return add(unsafe.Pointer(b), dataOffset+abi.OldMapBucketCount*2*goarch.PtrSize+i*uintptr(t.ValueSize)), true
 				}
 			}
 			return unsafe.Pointer(&zeroVal[0]), false
 		}
 		// long key, try not to do more comparisons than necessary
-		keymaybe := uintptr(abi.MapBucketCount)
-		for i, kptr := uintptr(0), b.keys(); i < abi.MapBucketCount; i, kptr = i+1, add(kptr, 2*goarch.PtrSize) {
+		keymaybe := uintptr(abi.OldMapBucketCount)
+		for i, kptr := uintptr(0), b.keys(); i < abi.OldMapBucketCount; i, kptr = i+1, add(kptr, 2*goarch.PtrSize) {
 			k := (*stringStruct)(kptr)
 			if k.len != key.len || isEmpty(b.tophash[i]) {
 				if b.tophash[i] == emptyRest {
@@ -156,7 +159,7 @@ func mapaccess2_faststr(t *maptype, h *hmap, ky string) (unsafe.Pointer, bool) {
 				continue
 			}
 			if k.str == key.str {
-				return add(unsafe.Pointer(b), dataOffset+abi.MapBucketCount*2*goarch.PtrSize+i*uintptr(t.ValueSize)), true
+				return add(unsafe.Pointer(b), dataOffset+abi.OldMapBucketCount*2*goarch.PtrSize+i*uintptr(t.ValueSize)), true
 			}
 			// check first 4 bytes
 			if *((*[4]byte)(key.str)) != *((*[4]byte)(k.str)) {
@@ -166,16 +169,16 @@ func mapaccess2_faststr(t *maptype, h *hmap, ky string) (unsafe.Pointer, bool) {
 			if *((*[4]byte)(add(key.str, uintptr(key.len)-4))) != *((*[4]byte)(add(k.str, uintptr(key.len)-4))) {
 				continue
 			}
-			if keymaybe != abi.MapBucketCount {
+			if keymaybe != abi.OldMapBucketCount {
 				// Two keys are potential matches. Use hash to distinguish them.
 				goto dohash
 			}
 			keymaybe = i
 		}
-		if keymaybe != abi.MapBucketCount {
+		if keymaybe != abi.OldMapBucketCount {
 			k := (*stringStruct)(add(unsafe.Pointer(b), dataOffset+keymaybe*2*goarch.PtrSize))
 			if memequal(k.str, key.str, uintptr(key.len)) {
-				return add(unsafe.Pointer(b), dataOffset+abi.MapBucketCount*2*goarch.PtrSize+keymaybe*uintptr(t.ValueSize)), true
+				return add(unsafe.Pointer(b), dataOffset+abi.OldMapBucketCount*2*goarch.PtrSize+keymaybe*uintptr(t.ValueSize)), true
 			}
 		}
 		return unsafe.Pointer(&zeroVal[0]), false
@@ -196,13 +199,13 @@ dohash:
 	}
 	top := tophash(hash)
 	for ; b != nil; b = b.overflow(t) {
-		for i, kptr := uintptr(0), b.keys(); i < abi.MapBucketCount; i, kptr = i+1, add(kptr, 2*goarch.PtrSize) {
+		for i, kptr := uintptr(0), b.keys(); i < abi.OldMapBucketCount; i, kptr = i+1, add(kptr, 2*goarch.PtrSize) {
 			k := (*stringStruct)(kptr)
 			if k.len != key.len || b.tophash[i] != top {
 				continue
 			}
 			if k.str == key.str || memequal(k.str, key.str, uintptr(key.len)) {
-				return add(unsafe.Pointer(b), dataOffset+abi.MapBucketCount*2*goarch.PtrSize+i*uintptr(t.ValueSize)), true
+				return add(unsafe.Pointer(b), dataOffset+abi.OldMapBucketCount*2*goarch.PtrSize+i*uintptr(t.ValueSize)), true
 			}
 		}
 	}
@@ -213,7 +216,6 @@ dohash:
 // but widely used packages access it using linkname.
 // Notable members of the hall of shame include:
 //   - github.com/bytedance/sonic
-//   - github.com/cloudwego/frugal
 //   - github.com/ugorji/go/codec
 //
 // Do not remove or change the type signature.
@@ -225,7 +227,7 @@ func mapassign_faststr(t *maptype, h *hmap, s string) unsafe.Pointer {
 		panic(plainError("assignment to entry in nil map"))
 	}
 	if raceenabled {
-		callerpc := getcallerpc()
+		callerpc := sys.GetCallerPC()
 		racewritepc(unsafe.Pointer(h), callerpc, abi.FuncPCABIInternal(mapassign_faststr))
 	}
 	if h.flags&hashWriting != 0 {
@@ -255,7 +257,7 @@ again:
 
 bucketloop:
 	for {
-		for i := uintptr(0); i < abi.MapBucketCount; i++ {
+		for i := uintptr(0); i < abi.OldMapBucketCount; i++ {
 			if b.tophash[i] != top {
 				if isEmpty(b.tophash[i]) && insertb == nil {
 					insertb = b
@@ -302,7 +304,7 @@ bucketloop:
 		insertb = h.newoverflow(t, b)
 		inserti = 0 // not necessary, but avoids needlessly spilling inserti
 	}
-	insertb.tophash[inserti&(abi.MapBucketCount-1)] = top // mask inserti to avoid bounds checks
+	insertb.tophash[inserti&(abi.OldMapBucketCount-1)] = top // mask inserti to avoid bounds checks
 
 	insertk = add(unsafe.Pointer(insertb), dataOffset+inserti*2*goarch.PtrSize)
 	// store new key at insert position
@@ -310,7 +312,7 @@ bucketloop:
 	h.count++
 
 done:
-	elem := add(unsafe.Pointer(insertb), dataOffset+abi.MapBucketCount*2*goarch.PtrSize+inserti*uintptr(t.ValueSize))
+	elem := add(unsafe.Pointer(insertb), dataOffset+abi.OldMapBucketCount*2*goarch.PtrSize+inserti*uintptr(t.ValueSize))
 	if h.flags&hashWriting == 0 {
 		fatal("concurrent map writes")
 	}
@@ -320,7 +322,7 @@ done:
 
 func mapdelete_faststr(t *maptype, h *hmap, ky string) {
 	if raceenabled && h != nil {
-		callerpc := getcallerpc()
+		callerpc := sys.GetCallerPC()
 		racewritepc(unsafe.Pointer(h), callerpc, abi.FuncPCABIInternal(mapdelete_faststr))
 	}
 	if h == nil || h.count == 0 {
@@ -345,7 +347,7 @@ func mapdelete_faststr(t *maptype, h *hmap, ky string) {
 	top := tophash(hash)
 search:
 	for ; b != nil; b = b.overflow(t) {
-		for i, kptr := uintptr(0), b.keys(); i < abi.MapBucketCount; i, kptr = i+1, add(kptr, 2*goarch.PtrSize) {
+		for i, kptr := uintptr(0), b.keys(); i < abi.OldMapBucketCount; i, kptr = i+1, add(kptr, 2*goarch.PtrSize) {
 			k := (*stringStruct)(kptr)
 			if k.len != key.len || b.tophash[i] != top {
 				continue
@@ -355,7 +357,7 @@ search:
 			}
 			// Clear key's pointer.
 			k.str = nil
-			e := add(unsafe.Pointer(b), dataOffset+abi.MapBucketCount*2*goarch.PtrSize+i*uintptr(t.ValueSize))
+			e := add(unsafe.Pointer(b), dataOffset+abi.OldMapBucketCount*2*goarch.PtrSize+i*uintptr(t.ValueSize))
 			if t.Elem.Pointers() {
 				memclrHasPointers(e, t.Elem.Size_)
 			} else {
@@ -364,7 +366,7 @@ search:
 			b.tophash[i] = emptyOne
 			// If the bucket now ends in a bunch of emptyOne states,
 			// change those to emptyRest states.
-			if i == abi.MapBucketCount-1 {
+			if i == abi.OldMapBucketCount-1 {
 				if b.overflow(t) != nil && b.overflow(t).tophash[0] != emptyRest {
 					goto notLast
 				}
@@ -383,7 +385,7 @@ search:
 					c := b
 					for b = bOrig; b.overflow(t) != c; b = b.overflow(t) {
 					}
-					i = abi.MapBucketCount - 1
+					i = abi.OldMapBucketCount - 1
 				} else {
 					i--
 				}
@@ -431,7 +433,7 @@ func evacuate_faststr(t *maptype, h *hmap, oldbucket uintptr) {
 		x := &xy[0]
 		x.b = (*bmap)(add(h.buckets, oldbucket*uintptr(t.BucketSize)))
 		x.k = add(unsafe.Pointer(x.b), dataOffset)
-		x.e = add(x.k, abi.MapBucketCount*2*goarch.PtrSize)
+		x.e = add(x.k, abi.OldMapBucketCount*2*goarch.PtrSize)
 
 		if !h.sameSizeGrow() {
 			// Only calculate y pointers if we're growing bigger.
@@ -439,13 +441,13 @@ func evacuate_faststr(t *maptype, h *hmap, oldbucket uintptr) {
 			y := &xy[1]
 			y.b = (*bmap)(add(h.buckets, (oldbucket+newbit)*uintptr(t.BucketSize)))
 			y.k = add(unsafe.Pointer(y.b), dataOffset)
-			y.e = add(y.k, abi.MapBucketCount*2*goarch.PtrSize)
+			y.e = add(y.k, abi.OldMapBucketCount*2*goarch.PtrSize)
 		}
 
 		for ; b != nil; b = b.overflow(t) {
 			k := add(unsafe.Pointer(b), dataOffset)
-			e := add(k, abi.MapBucketCount*2*goarch.PtrSize)
-			for i := 0; i < abi.MapBucketCount; i, k, e = i+1, add(k, 2*goarch.PtrSize), add(e, uintptr(t.ValueSize)) {
+			e := add(k, abi.OldMapBucketCount*2*goarch.PtrSize)
+			for i := 0; i < abi.OldMapBucketCount; i, k, e = i+1, add(k, 2*goarch.PtrSize), add(e, uintptr(t.ValueSize)) {
 				top := b.tophash[i]
 				if isEmpty(top) {
 					b.tophash[i] = evacuatedEmpty
@@ -467,13 +469,13 @@ func evacuate_faststr(t *maptype, h *hmap, oldbucket uintptr) {
 				b.tophash[i] = evacuatedX + useY // evacuatedX + 1 == evacuatedY, enforced in makemap
 				dst := &xy[useY]                 // evacuation destination
 
-				if dst.i == abi.MapBucketCount {
+				if dst.i == abi.OldMapBucketCount {
 					dst.b = h.newoverflow(t, dst.b)
 					dst.i = 0
 					dst.k = add(unsafe.Pointer(dst.b), dataOffset)
-					dst.e = add(dst.k, abi.MapBucketCount*2*goarch.PtrSize)
+					dst.e = add(dst.k, abi.OldMapBucketCount*2*goarch.PtrSize)
 				}
-				dst.b.tophash[dst.i&(abi.MapBucketCount-1)] = top // mask dst.i as an optimization, to avoid a bounds check
+				dst.b.tophash[dst.i&(abi.OldMapBucketCount-1)] = top // mask dst.i as an optimization, to avoid a bounds check
 
 				// Copy key.
 				*(*string)(dst.k) = *(*string)(k)
diff --git a/src/runtime/map_faststr_swiss.go b/src/runtime/map_faststr_swiss.go
new file mode 100644
index 00000000..23f6c1e8
--- /dev/null
+++ b/src/runtime/map_faststr_swiss.go
@@ -0,0 +1,44 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build goexperiment.swissmap
+
+package runtime
+
+import (
+	"internal/abi"
+	"internal/runtime/maps"
+	"unsafe"
+)
+
+// Functions below pushed from internal/runtime/maps.
+
+//go:linkname mapaccess1_faststr
+func mapaccess1_faststr(t *abi.SwissMapType, m *maps.Map, ky string) unsafe.Pointer
+
+// mapaccess2_faststr should be an internal detail,
+// but widely used packages access it using linkname.
+// Notable members of the hall of shame include:
+//   - github.com/ugorji/go/codec
+//
+// Do not remove or change the type signature.
+// See go.dev/issue/67401.
+//
+//go:linkname mapaccess2_faststr
+func mapaccess2_faststr(t *abi.SwissMapType, m *maps.Map, ky string) (unsafe.Pointer, bool)
+
+// mapassign_faststr should be an internal detail,
+// but widely used packages access it using linkname.
+// Notable members of the hall of shame include:
+//   - github.com/bytedance/sonic
+//   - github.com/ugorji/go/codec
+//
+// Do not remove or change the type signature.
+// See go.dev/issue/67401.
+//
+//go:linkname mapassign_faststr
+func mapassign_faststr(t *abi.SwissMapType, m *maps.Map, s string) unsafe.Pointer
+
+//go:linkname mapdelete_faststr
+func mapdelete_faststr(t *abi.SwissMapType, m *maps.Map, ky string)
diff --git a/src/runtime/map.go b/src/runtime/map_noswiss.go
similarity index 91%
rename from src/runtime/map.go
rename to src/runtime/map_noswiss.go
index 52d56fb5..327f0c81 100644
--- a/src/runtime/map.go
+++ b/src/runtime/map_noswiss.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build !goexperiment.swissmap
+
 package runtime
 
 // This file contains the implementation of Go's map type.
@@ -57,19 +59,22 @@ import (
 	"internal/abi"
 	"internal/goarch"
 	"internal/runtime/atomic"
-	"runtime/internal/math"
+	"internal/runtime/math"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
+type maptype = abi.OldMapType
+
 const (
 	// Maximum number of key/elem pairs a bucket can hold.
-	bucketCntBits = abi.MapBucketCountBits
+	bucketCntBits = abi.OldMapBucketCountBits
 
 	// Maximum average load of a bucket that triggers growth is bucketCnt*13/16 (about 80% full)
 	// Because of minimum alignment rules, bucketCnt is known to be at least 8.
 	// Represent as loadFactorNum/loadFactorDen, to allow integer math.
 	loadFactorDen = 2
-	loadFactorNum = loadFactorDen * abi.MapBucketCount * 13 / 16
+	loadFactorNum = loadFactorDen * abi.OldMapBucketCount * 13 / 16
 
 	// data offset should be the size of the bmap struct, but needs to be
 	// aligned correctly. For amd64p32 this means 64-bit alignment
@@ -118,6 +123,7 @@ type hmap struct {
 	buckets    unsafe.Pointer // array of 2^B Buckets. may be nil if count==0.
 	oldbuckets unsafe.Pointer // previous bucket array of half the size, non-nil only when growing
 	nevacuate  uintptr        // progress counter for evacuation (buckets less than this have been evacuated)
+	clearSeq   uint64
 
 	extra *mapextra // optional fields
 }
@@ -144,7 +150,7 @@ type bmap struct {
 	// tophash generally contains the top byte of the hash value
 	// for each key in this bucket. If tophash[0] < minTopHash,
 	// tophash[0] is a bucket evacuation state instead.
-	tophash [abi.MapBucketCount]uint8
+	tophash [abi.OldMapBucketCount]uint8
 	// Followed by bucketCnt keys and then bucketCnt elems.
 	// NOTE: packing all the keys together and then all the elems together makes the
 	// code a bit more complicated than alternating key/elem/key/elem/... but it allows
@@ -171,6 +177,7 @@ type hiter struct {
 	i           uint8
 	bucket      uintptr
 	checkBucket uintptr
+	clearSeq    uint64
 }
 
 // bucketShift returns 1<> h.B & (abi.MapBucketCount - 1))
+	it.offset = uint8(r >> h.B & (abi.OldMapBucketCount - 1))
 
 	// iterator state
 	it.bucket = it.startBucket
@@ -924,7 +929,6 @@ func mapiterinit(t *maptype, h *hmap, it *hiter) {
 // but widely used packages access it using linkname.
 // Notable members of the hall of shame include:
 //   - github.com/bytedance/sonic
-//   - github.com/cloudwego/frugal
 //   - github.com/RomiChan/protobuf
 //   - github.com/segmentio/encoding
 //   - github.com/ugorji/go/codec
@@ -937,7 +941,7 @@ func mapiterinit(t *maptype, h *hmap, it *hiter) {
 func mapiternext(it *hiter) {
 	h := it.h
 	if raceenabled {
-		callerpc := getcallerpc()
+		callerpc := sys.GetCallerPC()
 		racereadpc(unsafe.Pointer(h), callerpc, abi.FuncPCABIInternal(mapiternext))
 	}
 	if h.flags&hashWriting != 0 {
@@ -981,8 +985,8 @@ next:
 		}
 		i = 0
 	}
-	for ; i < abi.MapBucketCount; i++ {
-		offi := (i + it.offset) & (abi.MapBucketCount - 1)
+	for ; i < abi.OldMapBucketCount; i++ {
+		offi := (i + it.offset) & (abi.OldMapBucketCount - 1)
 		if isEmpty(b.tophash[offi]) || b.tophash[offi] == evacuatedEmpty {
 			// TODO: emptyRest is hard to use here, as we start iterating
 			// in the middle of a bucket. It's feasible, just tricky.
@@ -992,7 +996,7 @@ next:
 		if t.IndirectKey() {
 			k = *((*unsafe.Pointer)(k))
 		}
-		e := add(unsafe.Pointer(b), dataOffset+abi.MapBucketCount*uintptr(t.KeySize)+uintptr(offi)*uintptr(t.ValueSize))
+		e := add(unsafe.Pointer(b), dataOffset+abi.OldMapBucketCount*uintptr(t.KeySize)+uintptr(offi)*uintptr(t.ValueSize))
 		if checkBucket != noCheck && !h.sameSizeGrow() {
 			// Special case: iterator was started during a grow to a larger size
 			// and the grow is not done yet. We're working on a bucket whose
@@ -1021,8 +1025,9 @@ next:
 				}
 			}
 		}
-		if (b.tophash[offi] != evacuatedX && b.tophash[offi] != evacuatedY) ||
-			!(t.ReflexiveKey() || t.Key.Equal(k, k)) {
+		if it.clearSeq == h.clearSeq &&
+			((b.tophash[offi] != evacuatedX && b.tophash[offi] != evacuatedY) ||
+				!(t.ReflexiveKey() || t.Key.Equal(k, k))) {
 			// This is the golden data, we can return it.
 			// OR
 			// key!=key, so the entry can't be deleted or updated, so we can just return it.
@@ -1062,19 +1067,9 @@ next:
 
 // mapclear deletes all keys from a map.
 // It is called by the compiler.
-//
-// mapclear should be an internal detail,
-// but widely used packages access it using linkname.
-// Notable members of the hall of shame include:
-//   - github.com/cloudwego/frugal
-//
-// Do not remove or change the type signature.
-// See go.dev/issue/67401.
-//
-//go:linkname mapclear
 func mapclear(t *maptype, h *hmap) {
 	if raceenabled && h != nil {
-		callerpc := getcallerpc()
+		callerpc := sys.GetCallerPC()
 		pc := abi.FuncPCABIInternal(mapclear)
 		racewritepc(unsafe.Pointer(h), callerpc, pc)
 	}
@@ -1088,28 +1083,12 @@ func mapclear(t *maptype, h *hmap) {
 	}
 
 	h.flags ^= hashWriting
-
-	// Mark buckets empty, so existing iterators can be terminated, see issue #59411.
-	markBucketsEmpty := func(bucket unsafe.Pointer, mask uintptr) {
-		for i := uintptr(0); i <= mask; i++ {
-			b := (*bmap)(add(bucket, i*uintptr(t.BucketSize)))
-			for ; b != nil; b = b.overflow(t) {
-				for i := uintptr(0); i < abi.MapBucketCount; i++ {
-					b.tophash[i] = emptyRest
-				}
-			}
-		}
-	}
-	markBucketsEmpty(h.buckets, bucketMask(h.B))
-	if oldBuckets := h.oldbuckets; oldBuckets != nil {
-		markBucketsEmpty(oldBuckets, h.oldbucketmask())
-	}
-
 	h.flags &^= sameSizeGrow
 	h.oldbuckets = nil
 	h.nevacuate = 0
 	h.noverflow = 0
 	h.count = 0
+	h.clearSeq++
 
 	// Reset the hash seed to make it more difficult for attackers to
 	// repeatedly trigger hash collisions. See issue 25237.
@@ -1181,7 +1160,7 @@ func hashGrow(t *maptype, h *hmap) {
 
 // overLoadFactor reports whether count items placed in 1< abi.MapBucketCount && uintptr(count) > loadFactorNum*(bucketShift(B)/loadFactorDen)
+	return count > abi.OldMapBucketCount && uintptr(count) > loadFactorNum*(bucketShift(B)/loadFactorDen)
 }
 
 // tooManyOverflowBuckets reports whether noverflow buckets is too many for a map with 1< abi.MapMaxKeyBytes && (!t.IndirectKey() || t.KeySize != uint8(goarch.PtrSize)) ||
-		t.Key.Size_ <= abi.MapMaxKeyBytes && (t.IndirectKey() || t.KeySize != uint8(t.Key.Size_)) {
+	if t.Key.Size_ > abi.OldMapMaxKeyBytes && (!t.IndirectKey() || t.KeySize != uint8(goarch.PtrSize)) ||
+		t.Key.Size_ <= abi.OldMapMaxKeyBytes && (t.IndirectKey() || t.KeySize != uint8(t.Key.Size_)) {
 		throw("key size wrong")
 	}
-	if t.Elem.Size_ > abi.MapMaxElemBytes && (!t.IndirectElem() || t.ValueSize != uint8(goarch.PtrSize)) ||
-		t.Elem.Size_ <= abi.MapMaxElemBytes && (t.IndirectElem() || t.ValueSize != uint8(t.Elem.Size_)) {
+	if t.Elem.Size_ > abi.OldMapMaxElemBytes && (!t.IndirectElem() || t.ValueSize != uint8(goarch.PtrSize)) ||
+		t.Elem.Size_ <= abi.OldMapMaxElemBytes && (t.IndirectElem() || t.ValueSize != uint8(t.Elem.Size_)) {
 		throw("elem size wrong")
 	}
-	if t.Key.Align_ > abi.MapBucketCount {
+	if t.Key.Align_ > abi.OldMapBucketCount {
 		throw("key align too big")
 	}
-	if t.Elem.Align_ > abi.MapBucketCount {
+	if t.Elem.Align_ > abi.OldMapBucketCount {
 		throw("elem align too big")
 	}
 	if t.Key.Size_%uintptr(t.Key.Align_) != 0 {
@@ -1431,7 +1410,7 @@ func reflect_makemap(t *maptype, cap int) *hmap {
 	if t.Elem.Size_%uintptr(t.Elem.Align_) != 0 {
 		throw("elem size not a multiple of elem align")
 	}
-	if abi.MapBucketCount < 8 {
+	if abi.OldMapBucketCount < 8 {
 		throw("bucketsize too small for proper alignment")
 	}
 	if dataOffset%uintptr(t.Key.Align_) != 0 {
@@ -1537,7 +1516,7 @@ func reflect_mapiternext(it *hiter) {
 	mapiternext(it)
 }
 
-// reflect_mapiterkey is for package reflect,
+// reflect_mapiterkey was for package reflect,
 // but widely used packages access it using linkname.
 // Notable members of the hall of shame include:
 //   - github.com/goccy/go-json
@@ -1551,7 +1530,7 @@ func reflect_mapiterkey(it *hiter) unsafe.Pointer {
 	return it.key
 }
 
-// reflect_mapiterelem is for package reflect,
+// reflect_mapiterelem was for package reflect,
 // but widely used packages access it using linkname.
 // Notable members of the hall of shame include:
 //   - github.com/goccy/go-json
@@ -1580,7 +1559,7 @@ func reflect_maplen(h *hmap) int {
 		return 0
 	}
 	if raceenabled {
-		callerpc := getcallerpc()
+		callerpc := sys.GetCallerPC()
 		racereadpc(unsafe.Pointer(h), callerpc, abi.FuncPCABIInternal(reflect_maplen))
 	}
 	return h.count
@@ -1597,7 +1576,7 @@ func reflectlite_maplen(h *hmap) int {
 		return 0
 	}
 	if raceenabled {
-		callerpc := getcallerpc()
+		callerpc := sys.GetCallerPC()
 		racereadpc(unsafe.Pointer(h), callerpc, abi.FuncPCABIInternal(reflect_maplen))
 	}
 	return h.count
@@ -1622,26 +1601,26 @@ func mapclone(m any) any {
 // moveToBmap moves a bucket from src to dst. It returns the destination bucket or new destination bucket if it overflows
 // and the pos that the next key/value will be written, if pos == bucketCnt means needs to written in overflow bucket.
 func moveToBmap(t *maptype, h *hmap, dst *bmap, pos int, src *bmap) (*bmap, int) {
-	for i := 0; i < abi.MapBucketCount; i++ {
+	for i := 0; i < abi.OldMapBucketCount; i++ {
 		if isEmpty(src.tophash[i]) {
 			continue
 		}
 
-		for ; pos < abi.MapBucketCount; pos++ {
+		for ; pos < abi.OldMapBucketCount; pos++ {
 			if isEmpty(dst.tophash[pos]) {
 				break
 			}
 		}
 
-		if pos == abi.MapBucketCount {
+		if pos == abi.OldMapBucketCount {
 			dst = h.newoverflow(t, dst)
 			pos = 0
 		}
 
 		srcK := add(unsafe.Pointer(src), dataOffset+uintptr(i)*uintptr(t.KeySize))
-		srcEle := add(unsafe.Pointer(src), dataOffset+abi.MapBucketCount*uintptr(t.KeySize)+uintptr(i)*uintptr(t.ValueSize))
+		srcEle := add(unsafe.Pointer(src), dataOffset+abi.OldMapBucketCount*uintptr(t.KeySize)+uintptr(i)*uintptr(t.ValueSize))
 		dstK := add(unsafe.Pointer(dst), dataOffset+uintptr(pos)*uintptr(t.KeySize))
-		dstEle := add(unsafe.Pointer(dst), dataOffset+abi.MapBucketCount*uintptr(t.KeySize)+uintptr(pos)*uintptr(t.ValueSize))
+		dstEle := add(unsafe.Pointer(dst), dataOffset+abi.OldMapBucketCount*uintptr(t.KeySize)+uintptr(pos)*uintptr(t.ValueSize))
 
 		dst.tophash[pos] = src.tophash[i]
 		if t.IndirectKey() {
@@ -1754,7 +1733,7 @@ func mapclone2(t *maptype, src *hmap) *hmap {
 		// Process entries one at a time.
 		for srcBmap != nil {
 			// move from oldBlucket to new bucket
-			for i := uintptr(0); i < abi.MapBucketCount; i++ {
+			for i := uintptr(0); i < abi.OldMapBucketCount; i++ {
 				if isEmpty(srcBmap.tophash[i]) {
 					continue
 				}
@@ -1768,7 +1747,7 @@ func mapclone2(t *maptype, src *hmap) *hmap {
 					srcK = *((*unsafe.Pointer)(srcK))
 				}
 
-				srcEle := add(unsafe.Pointer(srcBmap), dataOffset+abi.MapBucketCount*uintptr(t.KeySize)+i*uintptr(t.ValueSize))
+				srcEle := add(unsafe.Pointer(srcBmap), dataOffset+abi.OldMapBucketCount*uintptr(t.KeySize)+i*uintptr(t.ValueSize))
 				if t.IndirectElem() {
 					srcEle = *((*unsafe.Pointer)(srcEle))
 				}
@@ -1794,7 +1773,7 @@ func keys(m any, p unsafe.Pointer) {
 	}
 	s := (*slice)(p)
 	r := int(rand())
-	offset := uint8(r >> h.B & (abi.MapBucketCount - 1))
+	offset := uint8(r >> h.B & (abi.OldMapBucketCount - 1))
 	if h.B == 0 {
 		copyKeys(t, h, (*bmap)(h.buckets), s, offset)
 		return
@@ -1823,8 +1802,8 @@ func keys(m any, p unsafe.Pointer) {
 
 func copyKeys(t *maptype, h *hmap, b *bmap, s *slice, offset uint8) {
 	for b != nil {
-		for i := uintptr(0); i < abi.MapBucketCount; i++ {
-			offi := (i + uintptr(offset)) & (abi.MapBucketCount - 1)
+		for i := uintptr(0); i < abi.OldMapBucketCount; i++ {
+			offi := (i + uintptr(offset)) & (abi.OldMapBucketCount - 1)
 			if isEmpty(b.tophash[offi]) {
 				continue
 			}
@@ -1857,7 +1836,7 @@ func values(m any, p unsafe.Pointer) {
 	}
 	s := (*slice)(p)
 	r := int(rand())
-	offset := uint8(r >> h.B & (abi.MapBucketCount - 1))
+	offset := uint8(r >> h.B & (abi.OldMapBucketCount - 1))
 	if h.B == 0 {
 		copyValues(t, h, (*bmap)(h.buckets), s, offset)
 		return
@@ -1886,8 +1865,8 @@ func values(m any, p unsafe.Pointer) {
 
 func copyValues(t *maptype, h *hmap, b *bmap, s *slice, offset uint8) {
 	for b != nil {
-		for i := uintptr(0); i < abi.MapBucketCount; i++ {
-			offi := (i + uintptr(offset)) & (abi.MapBucketCount - 1)
+		for i := uintptr(0); i < abi.OldMapBucketCount; i++ {
+			offi := (i + uintptr(offset)) & (abi.OldMapBucketCount - 1)
 			if isEmpty(b.tophash[offi]) {
 				continue
 			}
@@ -1896,7 +1875,7 @@ func copyValues(t *maptype, h *hmap, b *bmap, s *slice, offset uint8) {
 				fatal("concurrent map read and map write")
 			}
 
-			ele := add(unsafe.Pointer(b), dataOffset+abi.MapBucketCount*uintptr(t.KeySize)+offi*uintptr(t.ValueSize))
+			ele := add(unsafe.Pointer(b), dataOffset+abi.OldMapBucketCount*uintptr(t.KeySize)+offi*uintptr(t.ValueSize))
 			if t.IndirectElem() {
 				ele = *((*unsafe.Pointer)(ele))
 			}
diff --git a/src/runtime/map_noswiss_test.go b/src/runtime/map_noswiss_test.go
new file mode 100644
index 00000000..5af7b7b8
--- /dev/null
+++ b/src/runtime/map_noswiss_test.go
@@ -0,0 +1,214 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build !goexperiment.swissmap
+
+package runtime_test
+
+import (
+	"internal/abi"
+	"internal/goarch"
+	"runtime"
+	"slices"
+	"testing"
+)
+
+func TestHmapSize(t *testing.T) {
+	// The structure of hmap is defined in runtime/map.go
+	// and in cmd/compile/internal/reflectdata/map.go and must be in sync.
+	// The size of hmap should be 56 bytes on 64 bit and 36 bytes on 32 bit platforms.
+	var hmapSize = uintptr(2*8 + 5*goarch.PtrSize)
+	if runtime.RuntimeHmapSize != hmapSize {
+		t.Errorf("sizeof(runtime.hmap{})==%d, want %d", runtime.RuntimeHmapSize, hmapSize)
+	}
+}
+
+func TestLoadFactor(t *testing.T) {
+	for b := uint8(0); b < 20; b++ {
+		count := 13 * (1 << b) / 2 // 6.5
+		if b == 0 {
+			count = 8
+		}
+		if runtime.OverLoadFactor(count, b) {
+			t.Errorf("OverLoadFactor(%d,%d)=true, want false", count, b)
+		}
+		if !runtime.OverLoadFactor(count+1, b) {
+			t.Errorf("OverLoadFactor(%d,%d)=false, want true", count+1, b)
+		}
+	}
+}
+
+func TestMapIterOrder(t *testing.T) {
+	sizes := []int{3, 7, 9, 15}
+	if abi.OldMapBucketCountBits >= 5 {
+		// it gets flaky (often only one iteration order) at size 3 when abi.MapBucketCountBits >=5.
+		t.Fatalf("This test becomes flaky if abi.MapBucketCountBits(=%d) is 5 or larger", abi.OldMapBucketCountBits)
+	}
+	for _, n := range sizes {
+		for i := 0; i < 1000; i++ {
+			// Make m be {0: true, 1: true, ..., n-1: true}.
+			m := make(map[int]bool)
+			for i := 0; i < n; i++ {
+				m[i] = true
+			}
+			// Check that iterating over the map produces at least two different orderings.
+			ord := func() []int {
+				var s []int
+				for key := range m {
+					s = append(s, key)
+				}
+				return s
+			}
+			first := ord()
+			ok := false
+			for try := 0; try < 100; try++ {
+				if !slices.Equal(first, ord()) {
+					ok = true
+					break
+				}
+			}
+			if !ok {
+				t.Errorf("Map with n=%d elements had consistent iteration order: %v", n, first)
+				break
+			}
+		}
+	}
+}
+
+const bs = abi.OldMapBucketCount
+
+// belowOverflow should be a pretty-full pair of buckets;
+// atOverflow is 1/8 bs larger = 13/8 buckets or two buckets
+// that are 13/16 full each, which is the overflow boundary.
+// Adding one to that should ensure overflow to the next higher size.
+const (
+	belowOverflow = bs * 3 / 2           // 1.5 bs = 2 buckets @ 75%
+	atOverflow    = belowOverflow + bs/8 // 2 buckets at 13/16 fill.
+)
+
+var mapBucketTests = [...]struct {
+	n        int // n is the number of map elements
+	noescape int // number of expected buckets for non-escaping map
+	escape   int // number of expected buckets for escaping map
+}{
+	{-(1 << 30), 1, 1},
+	{-1, 1, 1},
+	{0, 1, 1},
+	{1, 1, 1},
+	{bs, 1, 1},
+	{bs + 1, 2, 2},
+	{belowOverflow, 2, 2},  // 1.5 bs = 2 buckets @ 75%
+	{atOverflow + 1, 4, 4}, // 13/8 bs + 1 == overflow to 4
+
+	{2 * belowOverflow, 4, 4}, // 3 bs = 4 buckets @75%
+	{2*atOverflow + 1, 8, 8},  // 13/4 bs + 1 = overflow to 8
+
+	{4 * belowOverflow, 8, 8},  // 6 bs = 8 buckets @ 75%
+	{4*atOverflow + 1, 16, 16}, // 13/2 bs + 1 = overflow to 16
+}
+
+func TestMapBuckets(t *testing.T) {
+	// Test that maps of different sizes have the right number of buckets.
+	// Non-escaping maps with small buckets (like map[int]int) never
+	// have a nil bucket pointer due to starting with preallocated buckets
+	// on the stack. Escaping maps start with a non-nil bucket pointer if
+	// hint size is above bucketCnt and thereby have more than one bucket.
+	// These tests depend on bucketCnt and loadFactor* in map.go.
+	t.Run("mapliteral", func(t *testing.T) {
+		for _, tt := range mapBucketTests {
+			localMap := map[int]int{}
+			if runtime.MapBucketsPointerIsNil(localMap) {
+				t.Errorf("no escape: buckets pointer is nil for non-escaping map")
+			}
+			for i := 0; i < tt.n; i++ {
+				localMap[i] = i
+			}
+			if got := runtime.MapBucketsCount(localMap); got != tt.noescape {
+				t.Errorf("no escape: n=%d want %d buckets, got %d", tt.n, tt.noescape, got)
+			}
+			escapingMap := runtime.Escape(map[int]int{})
+			if count := runtime.MapBucketsCount(escapingMap); count > 1 && runtime.MapBucketsPointerIsNil(escapingMap) {
+				t.Errorf("escape: buckets pointer is nil for n=%d buckets", count)
+			}
+			for i := 0; i < tt.n; i++ {
+				escapingMap[i] = i
+			}
+			if got := runtime.MapBucketsCount(escapingMap); got != tt.escape {
+				t.Errorf("escape n=%d want %d buckets, got %d", tt.n, tt.escape, got)
+			}
+		}
+	})
+	t.Run("nohint", func(t *testing.T) {
+		for _, tt := range mapBucketTests {
+			localMap := make(map[int]int)
+			if runtime.MapBucketsPointerIsNil(localMap) {
+				t.Errorf("no escape: buckets pointer is nil for non-escaping map")
+			}
+			for i := 0; i < tt.n; i++ {
+				localMap[i] = i
+			}
+			if got := runtime.MapBucketsCount(localMap); got != tt.noescape {
+				t.Errorf("no escape: n=%d want %d buckets, got %d", tt.n, tt.noescape, got)
+			}
+			escapingMap := runtime.Escape(make(map[int]int))
+			if count := runtime.MapBucketsCount(escapingMap); count > 1 && runtime.MapBucketsPointerIsNil(escapingMap) {
+				t.Errorf("escape: buckets pointer is nil for n=%d buckets", count)
+			}
+			for i := 0; i < tt.n; i++ {
+				escapingMap[i] = i
+			}
+			if got := runtime.MapBucketsCount(escapingMap); got != tt.escape {
+				t.Errorf("escape: n=%d want %d buckets, got %d", tt.n, tt.escape, got)
+			}
+		}
+	})
+	t.Run("makemap", func(t *testing.T) {
+		for _, tt := range mapBucketTests {
+			localMap := make(map[int]int, tt.n)
+			if runtime.MapBucketsPointerIsNil(localMap) {
+				t.Errorf("no escape: buckets pointer is nil for non-escaping map")
+			}
+			for i := 0; i < tt.n; i++ {
+				localMap[i] = i
+			}
+			if got := runtime.MapBucketsCount(localMap); got != tt.noescape {
+				t.Errorf("no escape: n=%d want %d buckets, got %d", tt.n, tt.noescape, got)
+			}
+			escapingMap := runtime.Escape(make(map[int]int, tt.n))
+			if count := runtime.MapBucketsCount(escapingMap); count > 1 && runtime.MapBucketsPointerIsNil(escapingMap) {
+				t.Errorf("escape: buckets pointer is nil for n=%d buckets", count)
+			}
+			for i := 0; i < tt.n; i++ {
+				escapingMap[i] = i
+			}
+			if got := runtime.MapBucketsCount(escapingMap); got != tt.escape {
+				t.Errorf("escape: n=%d want %d buckets, got %d", tt.n, tt.escape, got)
+			}
+		}
+	})
+	t.Run("makemap64", func(t *testing.T) {
+		for _, tt := range mapBucketTests {
+			localMap := make(map[int]int, int64(tt.n))
+			if runtime.MapBucketsPointerIsNil(localMap) {
+				t.Errorf("no escape: buckets pointer is nil for non-escaping map")
+			}
+			for i := 0; i < tt.n; i++ {
+				localMap[i] = i
+			}
+			if got := runtime.MapBucketsCount(localMap); got != tt.noescape {
+				t.Errorf("no escape: n=%d want %d buckets, got %d", tt.n, tt.noescape, got)
+			}
+			escapingMap := runtime.Escape(make(map[int]int, tt.n))
+			if count := runtime.MapBucketsCount(escapingMap); count > 1 && runtime.MapBucketsPointerIsNil(escapingMap) {
+				t.Errorf("escape: buckets pointer is nil for n=%d buckets", count)
+			}
+			for i := 0; i < tt.n; i++ {
+				escapingMap[i] = i
+			}
+			if got := runtime.MapBucketsCount(escapingMap); got != tt.escape {
+				t.Errorf("escape: n=%d want %d buckets, got %d", tt.n, tt.escape, got)
+			}
+		}
+	})
+}
diff --git a/src/runtime/map_swiss.go b/src/runtime/map_swiss.go
new file mode 100644
index 00000000..a8fe8725
--- /dev/null
+++ b/src/runtime/map_swiss.go
@@ -0,0 +1,363 @@
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build goexperiment.swissmap
+
+package runtime
+
+import (
+	"internal/abi"
+	"internal/runtime/maps"
+	"internal/runtime/sys"
+	"unsafe"
+)
+
+const (
+	// TODO: remove? These are used by tests but not the actual map
+	loadFactorNum = 7
+	loadFactorDen = 8
+)
+
+type maptype = abi.SwissMapType
+
+//go:linkname maps_errNilAssign internal/runtime/maps.errNilAssign
+var maps_errNilAssign error = plainError("assignment to entry in nil map")
+
+//go:linkname maps_mapKeyError internal/runtime/maps.mapKeyError
+func maps_mapKeyError(t *abi.SwissMapType, p unsafe.Pointer) error {
+	return mapKeyError(t, p)
+}
+
+func makemap64(t *abi.SwissMapType, hint int64, m *maps.Map) *maps.Map {
+	if int64(int(hint)) != hint {
+		hint = 0
+	}
+	return makemap(t, int(hint), m)
+}
+
+// makemap_small implements Go map creation for make(map[k]v) and
+// make(map[k]v, hint) when hint is known to be at most abi.SwissMapGroupSlots
+// at compile time and the map needs to be allocated on the heap.
+//
+// makemap_small should be an internal detail,
+// but widely used packages access it using linkname.
+// Notable members of the hall of shame include:
+//   - github.com/bytedance/sonic
+//
+// Do not remove or change the type signature.
+// See go.dev/issue/67401.
+//
+//go:linkname makemap_small
+func makemap_small() *maps.Map {
+	return maps.NewEmptyMap()
+}
+
+// makemap implements Go map creation for make(map[k]v, hint).
+// If the compiler has determined that the map or the first group
+// can be created on the stack, m and optionally m.dirPtr may be non-nil.
+// If m != nil, the map can be created directly in m.
+// If m.dirPtr != nil, it points to a group usable for a small map.
+//
+// makemap should be an internal detail,
+// but widely used packages access it using linkname.
+// Notable members of the hall of shame include:
+//   - github.com/ugorji/go/codec
+//
+// Do not remove or change the type signature.
+// See go.dev/issue/67401.
+//
+//go:linkname makemap
+func makemap(t *abi.SwissMapType, hint int, m *maps.Map) *maps.Map {
+	if hint < 0 {
+		hint = 0
+	}
+
+	return maps.NewMap(t, uintptr(hint), m, maxAlloc)
+}
+
+// mapaccess1 returns a pointer to h[key].  Never returns nil, instead
+// it will return a reference to the zero object for the elem type if
+// the key is not in the map.
+// NOTE: The returned pointer may keep the whole map live, so don't
+// hold onto it for very long.
+//
+// mapaccess1 is pushed from internal/runtime/maps. We could just call it, but
+// we want to avoid one layer of call.
+//
+//go:linkname mapaccess1
+func mapaccess1(t *abi.SwissMapType, m *maps.Map, key unsafe.Pointer) unsafe.Pointer
+
+// mapaccess2 should be an internal detail,
+// but widely used packages access it using linkname.
+// Notable members of the hall of shame include:
+//   - github.com/ugorji/go/codec
+//
+// Do not remove or change the type signature.
+// See go.dev/issue/67401.
+//
+//go:linkname mapaccess2
+func mapaccess2(t *abi.SwissMapType, m *maps.Map, key unsafe.Pointer) (unsafe.Pointer, bool)
+
+func mapaccess1_fat(t *abi.SwissMapType, m *maps.Map, key, zero unsafe.Pointer) unsafe.Pointer {
+	e := mapaccess1(t, m, key)
+	if e == unsafe.Pointer(&zeroVal[0]) {
+		return zero
+	}
+	return e
+}
+
+func mapaccess2_fat(t *abi.SwissMapType, m *maps.Map, key, zero unsafe.Pointer) (unsafe.Pointer, bool) {
+	e := mapaccess1(t, m, key)
+	if e == unsafe.Pointer(&zeroVal[0]) {
+		return zero, false
+	}
+	return e, true
+}
+
+// mapassign is pushed from internal/runtime/maps. We could just call it, but
+// we want to avoid one layer of call.
+//
+// mapassign should be an internal detail,
+// but widely used packages access it using linkname.
+// Notable members of the hall of shame include:
+//   - github.com/bytedance/sonic
+//   - github.com/RomiChan/protobuf
+//   - github.com/segmentio/encoding
+//   - github.com/ugorji/go/codec
+//
+// Do not remove or change the type signature.
+// See go.dev/issue/67401.
+//
+//go:linkname mapassign
+func mapassign(t *abi.SwissMapType, m *maps.Map, key unsafe.Pointer) unsafe.Pointer
+
+// mapdelete should be an internal detail,
+// but widely used packages access it using linkname.
+// Notable members of the hall of shame include:
+//   - github.com/ugorji/go/codec
+//
+// Do not remove or change the type signature.
+// See go.dev/issue/67401.
+//
+//go:linkname mapdelete
+func mapdelete(t *abi.SwissMapType, m *maps.Map, key unsafe.Pointer) {
+	if raceenabled && m != nil {
+		callerpc := sys.GetCallerPC()
+		pc := abi.FuncPCABIInternal(mapdelete)
+		racewritepc(unsafe.Pointer(m), callerpc, pc)
+		raceReadObjectPC(t.Key, key, callerpc, pc)
+	}
+	if msanenabled && m != nil {
+		msanread(key, t.Key.Size_)
+	}
+	if asanenabled && m != nil {
+		asanread(key, t.Key.Size_)
+	}
+
+	m.Delete(t, key)
+}
+
+// mapIterStart initializes the Iter struct used for ranging over maps and
+// performs the first step of iteration. The Iter struct pointed to by 'it' is
+// allocated on the stack by the compilers order pass or on the heap by
+// reflect. Both need to have zeroed it since the struct contains pointers.
+func mapIterStart(t *abi.SwissMapType, m *maps.Map, it *maps.Iter) {
+	if raceenabled && m != nil {
+		callerpc := sys.GetCallerPC()
+		racereadpc(unsafe.Pointer(m), callerpc, abi.FuncPCABIInternal(mapIterStart))
+	}
+
+	it.Init(t, m)
+	it.Next()
+}
+
+// mapIterNext performs the next step of iteration. Afterwards, the next
+// key/elem are in it.Key()/it.Elem().
+func mapIterNext(it *maps.Iter) {
+	if raceenabled {
+		callerpc := sys.GetCallerPC()
+		racereadpc(unsafe.Pointer(it.Map()), callerpc, abi.FuncPCABIInternal(mapIterNext))
+	}
+
+	it.Next()
+}
+
+// mapclear deletes all keys from a map.
+func mapclear(t *abi.SwissMapType, m *maps.Map) {
+	if raceenabled && m != nil {
+		callerpc := sys.GetCallerPC()
+		pc := abi.FuncPCABIInternal(mapclear)
+		racewritepc(unsafe.Pointer(m), callerpc, pc)
+	}
+
+	m.Clear(t)
+}
+
+// Reflect stubs. Called from ../reflect/asm_*.s
+
+// reflect_makemap is for package reflect,
+// but widely used packages access it using linkname.
+// Notable members of the hall of shame include:
+//   - gitee.com/quant1x/gox
+//   - github.com/modern-go/reflect2
+//   - github.com/goccy/go-json
+//   - github.com/RomiChan/protobuf
+//   - github.com/segmentio/encoding
+//   - github.com/v2pro/plz
+//
+// Do not remove or change the type signature.
+// See go.dev/issue/67401.
+//
+//go:linkname reflect_makemap reflect.makemap
+func reflect_makemap(t *abi.SwissMapType, cap int) *maps.Map {
+	// Check invariants and reflects math.
+	if t.Key.Equal == nil {
+		throw("runtime.reflect_makemap: unsupported map key type")
+	}
+	// TODO: other checks
+
+	return makemap(t, cap, nil)
+}
+
+// reflect_mapaccess is for package reflect,
+// but widely used packages access it using linkname.
+// Notable members of the hall of shame include:
+//   - gitee.com/quant1x/gox
+//   - github.com/modern-go/reflect2
+//   - github.com/v2pro/plz
+//
+// Do not remove or change the type signature.
+// See go.dev/issue/67401.
+//
+//go:linkname reflect_mapaccess reflect.mapaccess
+func reflect_mapaccess(t *abi.SwissMapType, m *maps.Map, key unsafe.Pointer) unsafe.Pointer {
+	elem, ok := mapaccess2(t, m, key)
+	if !ok {
+		// reflect wants nil for a missing element
+		elem = nil
+	}
+	return elem
+}
+
+//go:linkname reflect_mapaccess_faststr reflect.mapaccess_faststr
+func reflect_mapaccess_faststr(t *abi.SwissMapType, m *maps.Map, key string) unsafe.Pointer {
+	elem, ok := mapaccess2_faststr(t, m, key)
+	if !ok {
+		// reflect wants nil for a missing element
+		elem = nil
+	}
+	return elem
+}
+
+// reflect_mapassign is for package reflect,
+// but widely used packages access it using linkname.
+// Notable members of the hall of shame include:
+//   - gitee.com/quant1x/gox
+//   - github.com/v2pro/plz
+//
+// Do not remove or change the type signature.
+//
+//go:linkname reflect_mapassign reflect.mapassign0
+func reflect_mapassign(t *abi.SwissMapType, m *maps.Map, key unsafe.Pointer, elem unsafe.Pointer) {
+	p := mapassign(t, m, key)
+	typedmemmove(t.Elem, p, elem)
+}
+
+//go:linkname reflect_mapassign_faststr reflect.mapassign_faststr0
+func reflect_mapassign_faststr(t *abi.SwissMapType, m *maps.Map, key string, elem unsafe.Pointer) {
+	p := mapassign_faststr(t, m, key)
+	typedmemmove(t.Elem, p, elem)
+}
+
+//go:linkname reflect_mapdelete reflect.mapdelete
+func reflect_mapdelete(t *abi.SwissMapType, m *maps.Map, key unsafe.Pointer) {
+	mapdelete(t, m, key)
+}
+
+//go:linkname reflect_mapdelete_faststr reflect.mapdelete_faststr
+func reflect_mapdelete_faststr(t *abi.SwissMapType, m *maps.Map, key string) {
+	mapdelete_faststr(t, m, key)
+}
+
+// reflect_maplen is for package reflect,
+// but widely used packages access it using linkname.
+// Notable members of the hall of shame include:
+//   - github.com/goccy/go-json
+//   - github.com/wI2L/jettison
+//
+// Do not remove or change the type signature.
+// See go.dev/issue/67401.
+//
+//go:linkname reflect_maplen reflect.maplen
+func reflect_maplen(m *maps.Map) int {
+	if m == nil {
+		return 0
+	}
+	if raceenabled {
+		callerpc := sys.GetCallerPC()
+		racereadpc(unsafe.Pointer(m), callerpc, abi.FuncPCABIInternal(reflect_maplen))
+	}
+	return int(m.Used())
+}
+
+//go:linkname reflect_mapclear reflect.mapclear
+func reflect_mapclear(t *abi.SwissMapType, m *maps.Map) {
+	mapclear(t, m)
+}
+
+//go:linkname reflectlite_maplen internal/reflectlite.maplen
+func reflectlite_maplen(m *maps.Map) int {
+	if m == nil {
+		return 0
+	}
+	if raceenabled {
+		callerpc := sys.GetCallerPC()
+		racereadpc(unsafe.Pointer(m), callerpc, abi.FuncPCABIInternal(reflect_maplen))
+	}
+	return int(m.Used())
+}
+
+// mapinitnoop is a no-op function known the Go linker; if a given global
+// map (of the right size) is determined to be dead, the linker will
+// rewrite the relocation (from the package init func) from the outlined
+// map init function to this symbol. Defined in assembly so as to avoid
+// complications with instrumentation (coverage, etc).
+func mapinitnoop()
+
+// mapclone for implementing maps.Clone
+//
+//go:linkname mapclone maps.clone
+func mapclone(m any) any {
+	e := efaceOf(&m)
+	e.data = unsafe.Pointer(mapclone2((*abi.SwissMapType)(unsafe.Pointer(e._type)), (*maps.Map)(e.data)))
+	return m
+}
+
+func mapclone2(t *abi.SwissMapType, src *maps.Map) *maps.Map {
+	dst := makemap(t, int(src.Used()), nil)
+
+	var iter maps.Iter
+	iter.Init(t, src)
+	for iter.Next(); iter.Key() != nil; iter.Next() {
+		dst.Put(t, iter.Key(), iter.Elem())
+	}
+
+	return dst
+}
+
+// keys for implementing maps.keys
+//
+//go:linkname keys maps.keys
+func keys(m any, p unsafe.Pointer) {
+	// Currently unused in the maps package.
+	panic("unimplemented")
+}
+
+// values for implementing maps.values
+//
+//go:linkname values maps.values
+func values(m any, p unsafe.Pointer) {
+	// Currently unused in the maps package.
+	panic("unimplemented")
+}
diff --git a/src/runtime/map_swiss_test.go b/src/runtime/map_swiss_test.go
new file mode 100644
index 00000000..d5c9fdbe
--- /dev/null
+++ b/src/runtime/map_swiss_test.go
@@ -0,0 +1,75 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build goexperiment.swissmap
+
+package runtime_test
+
+import (
+	"internal/abi"
+	"internal/goarch"
+	"internal/runtime/maps"
+	"slices"
+	"testing"
+	"unsafe"
+)
+
+func TestHmapSize(t *testing.T) {
+	// The structure of Map is defined in internal/runtime/maps/map.go
+	// and in cmd/compile/internal/reflectdata/map_swiss.go and must be in sync.
+	// The size of Map should be 48 bytes on 64 bit and 32 bytes on 32 bit platforms.
+	wantSize := uintptr(2*8 + 4*goarch.PtrSize)
+	gotSize := unsafe.Sizeof(maps.Map{})
+	if gotSize != wantSize {
+		t.Errorf("sizeof(maps.Map{})==%d, want %d", gotSize, wantSize)
+	}
+}
+
+// See also reflect_test.TestGroupSizeZero.
+func TestGroupSizeZero(t *testing.T) {
+	var m map[struct{}]struct{}
+	mTyp := abi.TypeOf(m)
+	mt := (*abi.SwissMapType)(unsafe.Pointer(mTyp))
+
+	// internal/runtime/maps when create pointers to slots, even if slots
+	// are size 0. The compiler should have reserved an extra word to
+	// ensure that pointers to the zero-size type at the end of group are
+	// valid.
+	if mt.Group.Size() <= 8 {
+		t.Errorf("Group size got %d want >8", mt.Group.Size())
+	}
+}
+
+func TestMapIterOrder(t *testing.T) {
+	sizes := []int{3, 7, 9, 15}
+	for _, n := range sizes {
+		for i := 0; i < 1000; i++ {
+			// Make m be {0: true, 1: true, ..., n-1: true}.
+			m := make(map[int]bool)
+			for i := 0; i < n; i++ {
+				m[i] = true
+			}
+			// Check that iterating over the map produces at least two different orderings.
+			ord := func() []int {
+				var s []int
+				for key := range m {
+					s = append(s, key)
+				}
+				return s
+			}
+			first := ord()
+			ok := false
+			for try := 0; try < 100; try++ {
+				if !slices.Equal(first, ord()) {
+					ok = true
+					break
+				}
+			}
+			if !ok {
+				t.Errorf("Map with n=%d elements had consistent iteration order: %v", n, first)
+				break
+			}
+		}
+	}
+}
diff --git a/src/runtime/map_test.go b/src/runtime/map_test.go
index 13624e09..c522c44a 100644
--- a/src/runtime/map_test.go
+++ b/src/runtime/map_test.go
@@ -6,8 +6,7 @@ package runtime_test
 
 import (
 	"fmt"
-	"internal/abi"
-	"internal/goarch"
+	"internal/goexperiment"
 	"internal/testenv"
 	"math"
 	"os"
@@ -21,17 +20,6 @@ import (
 	"unsafe"
 )
 
-func TestHmapSize(t *testing.T) {
-	// The structure of hmap is defined in runtime/map.go
-	// and in cmd/compile/internal/gc/reflect.go and must be in sync.
-	// The size of hmap should be 48 bytes on 64 bit and 28 bytes on 32 bit platforms.
-	var hmapSize = uintptr(8 + 5*goarch.PtrSize)
-	if runtime.RuntimeHmapSize != hmapSize {
-		t.Errorf("sizeof(runtime.hmap{})==%d, want %d", runtime.RuntimeHmapSize, hmapSize)
-	}
-
-}
-
 // negative zero is a good test because:
 //  1. 0 and -0 are equal, yet have distinct representations.
 //  2. 0 is represented as all zeros, -0 isn't.
@@ -144,7 +132,7 @@ func TestMapAppendAssignment(t *testing.T) {
 	m[0] = append(m[0], a...)
 
 	want := []int{12345, 67890, 123, 456, 7, 8, 9, 0}
-	if got := m[0]; !reflect.DeepEqual(got, want) {
+	if got := m[0]; !slices.Equal(got, want) {
 		t.Errorf("got %v, want %v", got, want)
 	}
 }
@@ -431,6 +419,12 @@ func TestEmptyKeyAndValue(t *testing.T) {
 	if len(a) != 1 {
 		t.Errorf("empty value insert problem")
 	}
+	if len(b) != 1 {
+		t.Errorf("empty key insert problem")
+	}
+	if len(c) != 1 {
+		t.Errorf("empty key+value insert problem")
+	}
 	if b[empty{}] != 1 {
 		t.Errorf("empty key returned wrong value")
 	}
@@ -509,43 +503,6 @@ func TestMapNanGrowIterator(t *testing.T) {
 	}
 }
 
-func TestMapIterOrder(t *testing.T) {
-	sizes := []int{3, 7, 9, 15}
-	if abi.MapBucketCountBits >= 5 {
-		// it gets flaky (often only one iteration order) at size 3 when abi.MapBucketCountBits >=5.
-		t.Fatalf("This test becomes flaky if abi.MapBucketCountBits(=%d) is 5 or larger", abi.MapBucketCountBits)
-	}
-	for _, n := range sizes {
-		for i := 0; i < 1000; i++ {
-			// Make m be {0: true, 1: true, ..., n-1: true}.
-			m := make(map[int]bool)
-			for i := 0; i < n; i++ {
-				m[i] = true
-			}
-			// Check that iterating over the map produces at least two different orderings.
-			ord := func() []int {
-				var s []int
-				for key := range m {
-					s = append(s, key)
-				}
-				return s
-			}
-			first := ord()
-			ok := false
-			for try := 0; try < 100; try++ {
-				if !reflect.DeepEqual(first, ord()) {
-					ok = true
-					break
-				}
-			}
-			if !ok {
-				t.Errorf("Map with n=%d elements had consistent iteration order: %v", n, first)
-				break
-			}
-		}
-	}
-}
-
 // Issue 8410
 func TestMapSparseIterOrder(t *testing.T) {
 	// Run several rounds to increase the probability
@@ -582,6 +539,38 @@ NextRound:
 	}
 }
 
+// Map iteration must not return duplicate entries.
+func TestMapIterDuplicate(t *testing.T) {
+	// Run several rounds to increase the probability
+	// of failure. One is not enough.
+	for range 1000 {
+		m := make(map[int]bool)
+		// Add 1000 items, remove 980.
+		for i := 0; i < 1000; i++ {
+			m[i] = true
+		}
+		for i := 20; i < 1000; i++ {
+			delete(m, i)
+		}
+
+		var want []int
+		for i := 0; i < 20; i++ {
+			want = append(want, i)
+		}
+
+		var got []int
+		for i := range m {
+			got = append(got, i)
+		}
+
+		slices.Sort(got)
+
+		if !reflect.DeepEqual(got, want) {
+			t.Errorf("iteration got %v want %v\n", got, want)
+		}
+	}
+}
+
 func TestMapStringBytesLookup(t *testing.T) {
 	// Use large string keys to avoid small-allocation coalescing,
 	// which can cause AllocsPerRun to report lower counts than it should.
@@ -682,165 +671,6 @@ func TestIgnoreBogusMapHint(t *testing.T) {
 	}
 }
 
-const bs = abi.MapBucketCount
-
-// belowOverflow should be a pretty-full pair of buckets;
-// atOverflow is 1/8 bs larger = 13/8 buckets or two buckets
-// that are 13/16 full each, which is the overflow boundary.
-// Adding one to that should ensure overflow to the next higher size.
-const (
-	belowOverflow = bs * 3 / 2           // 1.5 bs = 2 buckets @ 75%
-	atOverflow    = belowOverflow + bs/8 // 2 buckets at 13/16 fill.
-)
-
-var mapBucketTests = [...]struct {
-	n        int // n is the number of map elements
-	noescape int // number of expected buckets for non-escaping map
-	escape   int // number of expected buckets for escaping map
-}{
-	{-(1 << 30), 1, 1},
-	{-1, 1, 1},
-	{0, 1, 1},
-	{1, 1, 1},
-	{bs, 1, 1},
-	{bs + 1, 2, 2},
-	{belowOverflow, 2, 2},  // 1.5 bs = 2 buckets @ 75%
-	{atOverflow + 1, 4, 4}, // 13/8 bs + 1 == overflow to 4
-
-	{2 * belowOverflow, 4, 4}, // 3 bs = 4 buckets @75%
-	{2*atOverflow + 1, 8, 8},  // 13/4 bs + 1 = overflow to 8
-
-	{4 * belowOverflow, 8, 8},  // 6 bs = 8 buckets @ 75%
-	{4*atOverflow + 1, 16, 16}, // 13/2 bs + 1 = overflow to 16
-}
-
-func TestMapBuckets(t *testing.T) {
-	// Test that maps of different sizes have the right number of buckets.
-	// Non-escaping maps with small buckets (like map[int]int) never
-	// have a nil bucket pointer due to starting with preallocated buckets
-	// on the stack. Escaping maps start with a non-nil bucket pointer if
-	// hint size is above bucketCnt and thereby have more than one bucket.
-	// These tests depend on bucketCnt and loadFactor* in map.go.
-	t.Run("mapliteral", func(t *testing.T) {
-		for _, tt := range mapBucketTests {
-			localMap := map[int]int{}
-			if runtime.MapBucketsPointerIsNil(localMap) {
-				t.Errorf("no escape: buckets pointer is nil for non-escaping map")
-			}
-			for i := 0; i < tt.n; i++ {
-				localMap[i] = i
-			}
-			if got := runtime.MapBucketsCount(localMap); got != tt.noescape {
-				t.Errorf("no escape: n=%d want %d buckets, got %d", tt.n, tt.noescape, got)
-			}
-			escapingMap := runtime.Escape(map[int]int{})
-			if count := runtime.MapBucketsCount(escapingMap); count > 1 && runtime.MapBucketsPointerIsNil(escapingMap) {
-				t.Errorf("escape: buckets pointer is nil for n=%d buckets", count)
-			}
-			for i := 0; i < tt.n; i++ {
-				escapingMap[i] = i
-			}
-			if got := runtime.MapBucketsCount(escapingMap); got != tt.escape {
-				t.Errorf("escape n=%d want %d buckets, got %d", tt.n, tt.escape, got)
-			}
-		}
-	})
-	t.Run("nohint", func(t *testing.T) {
-		for _, tt := range mapBucketTests {
-			localMap := make(map[int]int)
-			if runtime.MapBucketsPointerIsNil(localMap) {
-				t.Errorf("no escape: buckets pointer is nil for non-escaping map")
-			}
-			for i := 0; i < tt.n; i++ {
-				localMap[i] = i
-			}
-			if got := runtime.MapBucketsCount(localMap); got != tt.noescape {
-				t.Errorf("no escape: n=%d want %d buckets, got %d", tt.n, tt.noescape, got)
-			}
-			escapingMap := runtime.Escape(make(map[int]int))
-			if count := runtime.MapBucketsCount(escapingMap); count > 1 && runtime.MapBucketsPointerIsNil(escapingMap) {
-				t.Errorf("escape: buckets pointer is nil for n=%d buckets", count)
-			}
-			for i := 0; i < tt.n; i++ {
-				escapingMap[i] = i
-			}
-			if got := runtime.MapBucketsCount(escapingMap); got != tt.escape {
-				t.Errorf("escape: n=%d want %d buckets, got %d", tt.n, tt.escape, got)
-			}
-		}
-	})
-	t.Run("makemap", func(t *testing.T) {
-		for _, tt := range mapBucketTests {
-			localMap := make(map[int]int, tt.n)
-			if runtime.MapBucketsPointerIsNil(localMap) {
-				t.Errorf("no escape: buckets pointer is nil for non-escaping map")
-			}
-			for i := 0; i < tt.n; i++ {
-				localMap[i] = i
-			}
-			if got := runtime.MapBucketsCount(localMap); got != tt.noescape {
-				t.Errorf("no escape: n=%d want %d buckets, got %d", tt.n, tt.noescape, got)
-			}
-			escapingMap := runtime.Escape(make(map[int]int, tt.n))
-			if count := runtime.MapBucketsCount(escapingMap); count > 1 && runtime.MapBucketsPointerIsNil(escapingMap) {
-				t.Errorf("escape: buckets pointer is nil for n=%d buckets", count)
-			}
-			for i := 0; i < tt.n; i++ {
-				escapingMap[i] = i
-			}
-			if got := runtime.MapBucketsCount(escapingMap); got != tt.escape {
-				t.Errorf("escape: n=%d want %d buckets, got %d", tt.n, tt.escape, got)
-			}
-		}
-	})
-	t.Run("makemap64", func(t *testing.T) {
-		for _, tt := range mapBucketTests {
-			localMap := make(map[int]int, int64(tt.n))
-			if runtime.MapBucketsPointerIsNil(localMap) {
-				t.Errorf("no escape: buckets pointer is nil for non-escaping map")
-			}
-			for i := 0; i < tt.n; i++ {
-				localMap[i] = i
-			}
-			if got := runtime.MapBucketsCount(localMap); got != tt.noescape {
-				t.Errorf("no escape: n=%d want %d buckets, got %d", tt.n, tt.noescape, got)
-			}
-			escapingMap := runtime.Escape(make(map[int]int, tt.n))
-			if count := runtime.MapBucketsCount(escapingMap); count > 1 && runtime.MapBucketsPointerIsNil(escapingMap) {
-				t.Errorf("escape: buckets pointer is nil for n=%d buckets", count)
-			}
-			for i := 0; i < tt.n; i++ {
-				escapingMap[i] = i
-			}
-			if got := runtime.MapBucketsCount(escapingMap); got != tt.escape {
-				t.Errorf("escape: n=%d want %d buckets, got %d", tt.n, tt.escape, got)
-			}
-		}
-	})
-
-}
-
-func benchmarkMapPop(b *testing.B, n int) {
-	m := map[int]int{}
-	for i := 0; i < b.N; i++ {
-		for j := 0; j < n; j++ {
-			m[j] = j
-		}
-		for j := 0; j < n; j++ {
-			// Use iterator to pop an element.
-			// We want this to be fast, see issue 8412.
-			for k := range m {
-				delete(m, k)
-				break
-			}
-		}
-	}
-}
-
-func BenchmarkMapPop100(b *testing.B)   { benchmarkMapPop(b, 100) }
-func BenchmarkMapPop1000(b *testing.B)  { benchmarkMapPop(b, 1000) }
-func BenchmarkMapPop10000(b *testing.B) { benchmarkMapPop(b, 10000) }
-
 var testNonEscapingMapVariable int = 8
 
 func TestNonEscapingMap(t *testing.T) {
@@ -849,224 +679,32 @@ func TestNonEscapingMap(t *testing.T) {
 		m[0] = 0
 	})
 	if n != 0 {
-		t.Fatalf("mapliteral: want 0 allocs, got %v", n)
+		t.Errorf("mapliteral: want 0 allocs, got %v", n)
 	}
 	n = testing.AllocsPerRun(1000, func() {
 		m := make(map[int]int)
 		m[0] = 0
 	})
 	if n != 0 {
-		t.Fatalf("no hint: want 0 allocs, got %v", n)
+		t.Errorf("no hint: want 0 allocs, got %v", n)
 	}
 	n = testing.AllocsPerRun(1000, func() {
 		m := make(map[int]int, 8)
 		m[0] = 0
 	})
 	if n != 0 {
-		t.Fatalf("with small hint: want 0 allocs, got %v", n)
+		t.Errorf("with small hint: want 0 allocs, got %v", n)
 	}
 	n = testing.AllocsPerRun(1000, func() {
 		m := make(map[int]int, testNonEscapingMapVariable)
 		m[0] = 0
 	})
 	if n != 0 {
-		t.Fatalf("with variable hint: want 0 allocs, got %v", n)
+		t.Errorf("with variable hint: want 0 allocs, got %v", n)
 	}
 
 }
 
-func benchmarkMapAssignInt32(b *testing.B, n int) {
-	a := make(map[int32]int)
-	for i := 0; i < b.N; i++ {
-		a[int32(i&(n-1))] = i
-	}
-}
-
-func benchmarkMapOperatorAssignInt32(b *testing.B, n int) {
-	a := make(map[int32]int)
-	for i := 0; i < b.N; i++ {
-		a[int32(i&(n-1))] += i
-	}
-}
-
-func benchmarkMapAppendAssignInt32(b *testing.B, n int) {
-	a := make(map[int32][]int)
-	b.ReportAllocs()
-	b.ResetTimer()
-	for i := 0; i < b.N; i++ {
-		key := int32(i & (n - 1))
-		a[key] = append(a[key], i)
-	}
-}
-
-func benchmarkMapDeleteInt32(b *testing.B, n int) {
-	a := make(map[int32]int, n)
-	b.ResetTimer()
-	for i := 0; i < b.N; i++ {
-		if len(a) == 0 {
-			b.StopTimer()
-			for j := i; j < i+n; j++ {
-				a[int32(j)] = j
-			}
-			b.StartTimer()
-		}
-		delete(a, int32(i))
-	}
-}
-
-func benchmarkMapAssignInt64(b *testing.B, n int) {
-	a := make(map[int64]int)
-	for i := 0; i < b.N; i++ {
-		a[int64(i&(n-1))] = i
-	}
-}
-
-func benchmarkMapOperatorAssignInt64(b *testing.B, n int) {
-	a := make(map[int64]int)
-	for i := 0; i < b.N; i++ {
-		a[int64(i&(n-1))] += i
-	}
-}
-
-func benchmarkMapAppendAssignInt64(b *testing.B, n int) {
-	a := make(map[int64][]int)
-	b.ReportAllocs()
-	b.ResetTimer()
-	for i := 0; i < b.N; i++ {
-		key := int64(i & (n - 1))
-		a[key] = append(a[key], i)
-	}
-}
-
-func benchmarkMapDeleteInt64(b *testing.B, n int) {
-	a := make(map[int64]int, n)
-	b.ResetTimer()
-	for i := 0; i < b.N; i++ {
-		if len(a) == 0 {
-			b.StopTimer()
-			for j := i; j < i+n; j++ {
-				a[int64(j)] = j
-			}
-			b.StartTimer()
-		}
-		delete(a, int64(i))
-	}
-}
-
-func benchmarkMapAssignStr(b *testing.B, n int) {
-	k := make([]string, n)
-	for i := 0; i < len(k); i++ {
-		k[i] = strconv.Itoa(i)
-	}
-	b.ResetTimer()
-	a := make(map[string]int)
-	for i := 0; i < b.N; i++ {
-		a[k[i&(n-1)]] = i
-	}
-}
-
-func benchmarkMapOperatorAssignStr(b *testing.B, n int) {
-	k := make([]string, n)
-	for i := 0; i < len(k); i++ {
-		k[i] = strconv.Itoa(i)
-	}
-	b.ResetTimer()
-	a := make(map[string]string)
-	for i := 0; i < b.N; i++ {
-		key := k[i&(n-1)]
-		a[key] += key
-	}
-}
-
-func benchmarkMapAppendAssignStr(b *testing.B, n int) {
-	k := make([]string, n)
-	for i := 0; i < len(k); i++ {
-		k[i] = strconv.Itoa(i)
-	}
-	a := make(map[string][]string)
-	b.ReportAllocs()
-	b.ResetTimer()
-	for i := 0; i < b.N; i++ {
-		key := k[i&(n-1)]
-		a[key] = append(a[key], key)
-	}
-}
-
-func benchmarkMapDeleteStr(b *testing.B, n int) {
-	i2s := make([]string, n)
-	for i := 0; i < n; i++ {
-		i2s[i] = strconv.Itoa(i)
-	}
-	a := make(map[string]int, n)
-	b.ResetTimer()
-	k := 0
-	for i := 0; i < b.N; i++ {
-		if len(a) == 0 {
-			b.StopTimer()
-			for j := 0; j < n; j++ {
-				a[i2s[j]] = j
-			}
-			k = i
-			b.StartTimer()
-		}
-		delete(a, i2s[i-k])
-	}
-}
-
-func benchmarkMapDeletePointer(b *testing.B, n int) {
-	i2p := make([]*int, n)
-	for i := 0; i < n; i++ {
-		i2p[i] = new(int)
-	}
-	a := make(map[*int]int, n)
-	b.ResetTimer()
-	k := 0
-	for i := 0; i < b.N; i++ {
-		if len(a) == 0 {
-			b.StopTimer()
-			for j := 0; j < n; j++ {
-				a[i2p[j]] = j
-			}
-			k = i
-			b.StartTimer()
-		}
-		delete(a, i2p[i-k])
-	}
-}
-
-func runWith(f func(*testing.B, int), v ...int) func(*testing.B) {
-	return func(b *testing.B) {
-		for _, n := range v {
-			b.Run(strconv.Itoa(n), func(b *testing.B) { f(b, n) })
-		}
-	}
-}
-
-func BenchmarkMapAssign(b *testing.B) {
-	b.Run("Int32", runWith(benchmarkMapAssignInt32, 1<<8, 1<<16))
-	b.Run("Int64", runWith(benchmarkMapAssignInt64, 1<<8, 1<<16))
-	b.Run("Str", runWith(benchmarkMapAssignStr, 1<<8, 1<<16))
-}
-
-func BenchmarkMapOperatorAssign(b *testing.B) {
-	b.Run("Int32", runWith(benchmarkMapOperatorAssignInt32, 1<<8, 1<<16))
-	b.Run("Int64", runWith(benchmarkMapOperatorAssignInt64, 1<<8, 1<<16))
-	b.Run("Str", runWith(benchmarkMapOperatorAssignStr, 1<<8, 1<<16))
-}
-
-func BenchmarkMapAppendAssign(b *testing.B) {
-	b.Run("Int32", runWith(benchmarkMapAppendAssignInt32, 1<<8, 1<<16))
-	b.Run("Int64", runWith(benchmarkMapAppendAssignInt64, 1<<8, 1<<16))
-	b.Run("Str", runWith(benchmarkMapAppendAssignStr, 1<<8, 1<<16))
-}
-
-func BenchmarkMapDelete(b *testing.B) {
-	b.Run("Int32", runWith(benchmarkMapDeleteInt32, 100, 1000, 10000))
-	b.Run("Int64", runWith(benchmarkMapDeleteInt64, 100, 1000, 10000))
-	b.Run("Str", runWith(benchmarkMapDeleteStr, 100, 1000, 10000))
-	b.Run("Pointer", runWith(benchmarkMapDeletePointer, 100, 1000, 10000))
-}
-
 func TestDeferDeleteSlow(t *testing.T) {
 	ks := []complex128{0, 1, 2, 3}
 
@@ -1422,22 +1060,11 @@ func TestEmptyMapWithInterfaceKey(t *testing.T) {
 	})
 }
 
-func TestLoadFactor(t *testing.T) {
-	for b := uint8(0); b < 20; b++ {
-		count := 13 * (1 << b) / 2 // 6.5
-		if b == 0 {
-			count = 8
-		}
-		if runtime.OverLoadFactor(count, b) {
-			t.Errorf("OverLoadFactor(%d,%d)=true, want false", count, b)
-		}
-		if !runtime.OverLoadFactor(count+1, b) {
-			t.Errorf("OverLoadFactor(%d,%d)=false, want true", count+1, b)
-		}
-	}
-}
-
 func TestMapKeys(t *testing.T) {
+	if goexperiment.SwissMap {
+		t.Skip("mapkeys not implemented for swissmaps")
+	}
+
 	type key struct {
 		s   string
 		pad [128]byte // sizeof(key) > abi.MapMaxKeyBytes
@@ -1453,6 +1080,10 @@ func TestMapKeys(t *testing.T) {
 }
 
 func TestMapValues(t *testing.T) {
+	if goexperiment.SwissMap {
+		t.Skip("mapvalues not implemented for swissmaps")
+	}
+
 	type val struct {
 		s   string
 		pad [128]byte // sizeof(val) > abi.MapMaxElemBytes
@@ -1544,3 +1175,30 @@ func TestMemHashGlobalSeed(t *testing.T) {
 		}
 	})
 }
+
+func TestMapIterDeleteReplace(t *testing.T) {
+	inc := 1
+	if testing.Short() {
+		inc = 100
+	}
+	for i := 0; i < 10000; i += inc {
+		t.Run(fmt.Sprint(i), func(t *testing.T) {
+			m := make(map[int]bool)
+			for j := range i {
+				m[j] = false
+			}
+
+			// Delete and replace all entries.
+			for k := range m {
+				delete(m, k)
+				m[k] = true
+			}
+
+			for k, v := range m {
+				if !v {
+					t.Errorf("m[%d] got false want true", k)
+				}
+			}
+		})
+	}
+}
diff --git a/src/runtime/mbarrier.go b/src/runtime/mbarrier.go
index 7dc8a1a5..a582a204 100644
--- a/src/runtime/mbarrier.go
+++ b/src/runtime/mbarrier.go
@@ -17,6 +17,7 @@ import (
 	"internal/abi"
 	"internal/goarch"
 	"internal/goexperiment"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
@@ -91,19 +92,6 @@ import (
 // barriers, which will slow down both the mutator and the GC, we always grey
 // the ptr object regardless of the slot's color.
 //
-// Another place where we intentionally omit memory barriers is when
-// accessing mheap_.arena_used to check if a pointer points into the
-// heap. On relaxed memory machines, it's possible for a mutator to
-// extend the size of the heap by updating arena_used, allocate an
-// object from this new region, and publish a pointer to that object,
-// but for tracing running on another processor to observe the pointer
-// but use the old value of arena_used. In this case, tracing will not
-// mark the object, even though it's reachable. However, the mutator
-// is guaranteed to execute a write barrier when it publishes the
-// pointer, so it will take care of marking the object. A general
-// consequence of this is that the garbage collector may cache the
-// value of mheap_.arena_used. (See issue #9984.)
-//
 //
 // Stack writes:
 //
@@ -224,8 +212,8 @@ func wbMove(typ *_type, dst, src unsafe.Pointer) {
 //go:linkname reflect_typedmemmove reflect.typedmemmove
 func reflect_typedmemmove(typ *_type, dst, src unsafe.Pointer) {
 	if raceenabled {
-		raceWriteObjectPC(typ, dst, getcallerpc(), abi.FuncPCABIInternal(reflect_typedmemmove))
-		raceReadObjectPC(typ, src, getcallerpc(), abi.FuncPCABIInternal(reflect_typedmemmove))
+		raceWriteObjectPC(typ, dst, sys.GetCallerPC(), abi.FuncPCABIInternal(reflect_typedmemmove))
+		raceReadObjectPC(typ, src, sys.GetCallerPC(), abi.FuncPCABIInternal(reflect_typedmemmove))
 	}
 	if msanenabled {
 		msanwrite(dst, typ.Size_)
@@ -243,6 +231,11 @@ func reflectlite_typedmemmove(typ *_type, dst, src unsafe.Pointer) {
 	reflect_typedmemmove(typ, dst, src)
 }
 
+//go:linkname maps_typedmemmove internal/runtime/maps.typedmemmove
+func maps_typedmemmove(typ *_type, dst, src unsafe.Pointer) {
+	typedmemmove(typ, dst, src)
+}
+
 // reflectcallmove is invoked by reflectcall to copy the return values
 // out of the stack and into the heap, invoking the necessary write
 // barriers. dst, src, and size describe the return value area to
@@ -294,7 +287,7 @@ func typedslicecopy(typ *_type, dstPtr unsafe.Pointer, dstLen int, srcPtr unsafe
 	// assignment operations, it's not instrumented in the calling
 	// code and needs its own instrumentation.
 	if raceenabled {
-		callerpc := getcallerpc()
+		callerpc := sys.GetCallerPC()
 		pc := abi.FuncPCABIInternal(slicecopy)
 		racewriterangepc(dstPtr, uintptr(n)*typ.Size_, callerpc, pc)
 		racereadrangepc(srcPtr, uintptr(n)*typ.Size_, callerpc, pc)
@@ -375,7 +368,7 @@ func typedmemclr(typ *_type, ptr unsafe.Pointer) {
 	memclrNoHeapPointers(ptr, typ.Size_)
 }
 
-// reflect_typedslicecopy is meant for package reflect,
+// reflect_typedmemclr is meant for package reflect,
 // but widely used packages access it using linkname.
 // Notable members of the hall of shame include:
 //   - github.com/ugorji/go/codec
@@ -388,6 +381,11 @@ func reflect_typedmemclr(typ *_type, ptr unsafe.Pointer) {
 	typedmemclr(typ, ptr)
 }
 
+//go:linkname maps_typedmemclr internal/runtime/maps.typedmemclr
+func maps_typedmemclr(typ *_type, ptr unsafe.Pointer) {
+	typedmemclr(typ, ptr)
+}
+
 //go:linkname reflect_typedmemclrpartial reflect.typedmemclrpartial
 func reflect_typedmemclrpartial(typ *_type, ptr unsafe.Pointer, off, size uintptr) {
 	if writeBarrier.enabled && typ.Pointers() {
diff --git a/src/runtime/mbitmap.go b/src/runtime/mbitmap.go
index 689fac10..148b2d78 100644
--- a/src/runtime/mbitmap.go
+++ b/src/runtime/mbitmap.go
@@ -59,7 +59,7 @@ import (
 	"internal/abi"
 	"internal/goarch"
 	"internal/runtime/atomic"
-	"runtime/internal/sys"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
@@ -197,15 +197,14 @@ func (span *mspan) typePointersOfUnchecked(addr uintptr) typePointers {
 			return typePointers{}
 		}
 	}
-	gcdata := typ.GCData
-	return typePointers{elem: addr, addr: addr, mask: readUintptr(gcdata), typ: typ}
+	gcmask := getGCMask(typ)
+	return typePointers{elem: addr, addr: addr, mask: readUintptr(gcmask), typ: typ}
 }
 
 // typePointersOfType is like typePointersOf, but assumes addr points to one or more
-// contiguous instances of the provided type. The provided type must not be nil and
-// it must not have its type metadata encoded as a gcprog.
+// contiguous instances of the provided type. The provided type must not be nil.
 //
-// It returns an iterator that tiles typ.GCData starting from addr. It's the caller's
+// It returns an iterator that tiles typ's gcmask starting from addr. It's the caller's
 // responsibility to limit iteration.
 //
 // nosplit because its callers are nosplit and require all their callees to be nosplit.
@@ -213,15 +212,15 @@ func (span *mspan) typePointersOfUnchecked(addr uintptr) typePointers {
 //go:nosplit
 func (span *mspan) typePointersOfType(typ *abi.Type, addr uintptr) typePointers {
 	const doubleCheck = false
-	if doubleCheck && (typ == nil || typ.Kind_&abi.KindGCProg != 0) {
+	if doubleCheck && typ == nil {
 		throw("bad type passed to typePointersOfType")
 	}
 	if span.spanclass.noscan() {
 		return typePointers{}
 	}
 	// Since we have the type, pretend we have a header.
-	gcdata := typ.GCData
-	return typePointers{elem: addr, addr: addr, mask: readUintptr(gcdata), typ: typ}
+	gcmask := getGCMask(typ)
+	return typePointers{elem: addr, addr: addr, mask: readUintptr(gcmask), typ: typ}
 }
 
 // nextFast is the fast path of next. nextFast is written to be inlineable and,
@@ -295,7 +294,7 @@ func (tp typePointers) next(limit uintptr) (typePointers, uintptr) {
 		}
 
 		// Grab more bits and try again.
-		tp.mask = readUintptr(addb(tp.typ.GCData, (tp.addr-tp.elem)/goarch.PtrSize/8))
+		tp.mask = readUintptr(addb(getGCMask(tp.typ), (tp.addr-tp.elem)/goarch.PtrSize/8))
 		if tp.addr+goarch.PtrSize*ptrBits > limit {
 			bits := (tp.addr + goarch.PtrSize*ptrBits - limit) / goarch.PtrSize
 			tp.mask &^= ((1 << (bits)) - 1) << (ptrBits - bits)
@@ -345,7 +344,7 @@ func (tp typePointers) fastForward(n, limit uintptr) typePointers {
 		// Move up to the next element.
 		tp.elem += tp.typ.Size_
 		tp.addr = tp.elem
-		tp.mask = readUintptr(tp.typ.GCData)
+		tp.mask = readUintptr(getGCMask(tp.typ))
 
 		// We may have exceeded the limit after this. Bail just like next does.
 		if tp.addr >= limit {
@@ -354,7 +353,7 @@ func (tp typePointers) fastForward(n, limit uintptr) typePointers {
 	} else {
 		// Grab the mask, but then clear any bits before the target address and any
 		// bits over the limit.
-		tp.mask = readUintptr(addb(tp.typ.GCData, (tp.addr-tp.elem)/goarch.PtrSize/8))
+		tp.mask = readUintptr(addb(getGCMask(tp.typ), (tp.addr-tp.elem)/goarch.PtrSize/8))
 		tp.mask &^= (1 << ((target - tp.addr) / goarch.PtrSize)) - 1
 	}
 	if tp.addr+goarch.PtrSize*ptrBits > limit {
@@ -457,7 +456,7 @@ func bulkBarrierPreWrite(dst, src, size uintptr, typ *abi.Type) {
 	}
 
 	var tp typePointers
-	if typ != nil && typ.Kind_&abi.KindGCProg == 0 {
+	if typ != nil {
 		tp = s.typePointersOfType(typ, dst)
 	} else {
 		tp = s.typePointersOf(dst, size)
@@ -518,7 +517,7 @@ func bulkBarrierPreWriteSrcOnly(dst, src, size uintptr, typ *abi.Type) {
 	}
 
 	var tp typePointers
-	if typ != nil && typ.Kind_&abi.KindGCProg == 0 {
+	if typ != nil {
 		tp = s.typePointersOfType(typ, dst)
 	} else {
 		tp = s.typePointersOf(dst, size)
@@ -535,12 +534,13 @@ func bulkBarrierPreWriteSrcOnly(dst, src, size uintptr, typ *abi.Type) {
 }
 
 // initHeapBits initializes the heap bitmap for a span.
-//
-// TODO(mknyszek): This should set the heap bits for single pointer
-// allocations eagerly to avoid calling heapSetType at allocation time,
-// just to write one bit.
-func (s *mspan) initHeapBits(forceClear bool) {
-	if (!s.spanclass.noscan() && heapBitsInSpan(s.elemsize)) || s.isUserArenaChunk {
+func (s *mspan) initHeapBits() {
+	if goarch.PtrSize == 8 && !s.spanclass.noscan() && s.spanclass.sizeclass() == 1 {
+		b := s.heapBits()
+		for i := range b {
+			b[i] = ^uintptr(0)
+		}
+	} else if (!s.spanclass.noscan() && heapBitsInSpan(s.elemsize)) || s.isUserArenaChunk {
 		b := s.heapBits()
 		clear(b)
 	}
@@ -640,37 +640,50 @@ func (span *mspan) heapBitsSmallForAddr(addr uintptr) uintptr {
 //go:nosplit
 func (span *mspan) writeHeapBitsSmall(x, dataSize uintptr, typ *_type) (scanSize uintptr) {
 	// The objects here are always really small, so a single load is sufficient.
-	src0 := readUintptr(typ.GCData)
+	src0 := readUintptr(getGCMask(typ))
 
-	// Create repetitions of the bitmap if we have a small array.
-	bits := span.elemsize / goarch.PtrSize
+	// Create repetitions of the bitmap if we have a small slice backing store.
 	scanSize = typ.PtrBytes
 	src := src0
-	switch typ.Size_ {
-	case goarch.PtrSize:
+	if typ.Size_ == goarch.PtrSize {
 		src = (1 << (dataSize / goarch.PtrSize)) - 1
-	default:
+	} else {
+		// N.B. We rely on dataSize being an exact multiple of the type size.
+		// The alternative is to be defensive and mask out src to the length
+		// of dataSize. The purpose is to save on one additional masking operation.
+		if doubleCheckHeapSetType && !asanenabled && dataSize%typ.Size_ != 0 {
+			throw("runtime: (*mspan).writeHeapBitsSmall: dataSize is not a multiple of typ.Size_")
+		}
 		for i := typ.Size_; i < dataSize; i += typ.Size_ {
 			src |= src0 << (i / goarch.PtrSize)
 			scanSize += typ.Size_
 		}
+		if asanenabled {
+			// Mask src down to dataSize. dataSize is going to be a strange size because of
+			// the redzone required for allocations when asan is enabled.
+			src &= (1 << (dataSize / goarch.PtrSize)) - 1
+		}
 	}
 
 	// Since we're never writing more than one uintptr's worth of bits, we're either going
 	// to do one or two writes.
-	dst := span.heapBits()
+	dst := unsafe.Pointer(span.base() + pageSize - pageSize/goarch.PtrSize/8)
 	o := (x - span.base()) / goarch.PtrSize
 	i := o / ptrBits
 	j := o % ptrBits
+	bits := span.elemsize / goarch.PtrSize
 	if j+bits > ptrBits {
 		// Two writes.
 		bits0 := ptrBits - j
 		bits1 := bits - bits0
-		dst[i+0] = dst[i+0]&(^uintptr(0)>>bits0) | (src << j)
-		dst[i+1] = dst[i+1]&^((1<> bits0)
+		dst0 := (*uintptr)(add(dst, (i+0)*goarch.PtrSize))
+		dst1 := (*uintptr)(add(dst, (i+1)*goarch.PtrSize))
+		*dst0 = (*dst0)&(^uintptr(0)>>bits0) | (src << j)
+		*dst1 = (*dst1)&^((1<> bits0)
 	} else {
 		// One write.
-		dst[i] = (dst[i] &^ (((1 << bits) - 1) << j)) | (src << j)
+		dst := (*uintptr)(add(dst, i*goarch.PtrSize))
+		*dst = (*dst)&^(((1< x+maxIterBytes {
-			size = x + maxIterBytes - interior
-		}
-		doubleCheckHeapPointersInterior(x, interior, size, dataSize, gctyp, header, span)
+	off := alignUp(uintptr(cheaprand())%dataSize, goarch.PtrSize)
+	size := dataSize - off
+	if size == 0 {
+		off -= goarch.PtrSize
+		size += goarch.PtrSize
 	}
-	return
+	interior := x + off
+	size -= alignDown(uintptr(cheaprand())%size, goarch.PtrSize)
+	if size == 0 {
+		size = goarch.PtrSize
+	}
+	// Round up the type to the size of the type.
+	size = (size + gctyp.Size_ - 1) / gctyp.Size_ * gctyp.Size_
+	if interior+size > x+maxIterBytes {
+		size = x + maxIterBytes - interior
+	}
+	doubleCheckHeapPointersInterior(x, interior, size, dataSize, gctyp, header, span)
 }
 
 func doubleCheckHeapPointers(x, dataSize uintptr, typ *_type, header **_type, span *mspan) {
@@ -794,7 +791,7 @@ func doubleCheckHeapPointers(x, dataSize uintptr, typ *_type, header **_type, sp
 			off := i % typ.Size_
 			if off < typ.PtrBytes {
 				j := off / goarch.PtrSize
-				want = *addb(typ.GCData, j/8)>>(j%8)&1 != 0
+				want = *addb(getGCMask(typ), j/8)>>(j%8)&1 != 0
 			}
 		}
 		if want {
@@ -817,7 +814,7 @@ func doubleCheckHeapPointers(x, dataSize uintptr, typ *_type, header **_type, sp
 		}
 		println("runtime: extra pointer:", hex(addr))
 	}
-	print("runtime: hasHeader=", header != nil, " typ.Size_=", typ.Size_, " hasGCProg=", typ.Kind_&abi.KindGCProg != 0, "\n")
+	print("runtime: hasHeader=", header != nil, " typ.Size_=", typ.Size_, " TFlagGCMaskOnDemaind=", typ.TFlag&abi.TFlagGCMaskOnDemand != 0, "\n")
 	print("runtime: x=", hex(x), " dataSize=", dataSize, " elemsize=", span.elemsize, "\n")
 	print("runtime: typ=", unsafe.Pointer(typ), " typ.PtrBytes=", typ.PtrBytes, "\n")
 	print("runtime: limit=", hex(x+span.elemsize), "\n")
@@ -851,7 +848,7 @@ func doubleCheckHeapPointersInterior(x, interior, size, dataSize uintptr, typ *_
 			off := i % typ.Size_
 			if off < typ.PtrBytes {
 				j := off / goarch.PtrSize
-				want = *addb(typ.GCData, j/8)>>(j%8)&1 != 0
+				want = *addb(getGCMask(typ), j/8)>>(j%8)&1 != 0
 			}
 		}
 		if want {
@@ -899,7 +896,7 @@ func doubleCheckHeapPointersInterior(x, interior, size, dataSize uintptr, typ *_
 			off := i % typ.Size_
 			if off < typ.PtrBytes {
 				j := off / goarch.PtrSize
-				want = *addb(typ.GCData, j/8)>>(j%8)&1 != 0
+				want = *addb(getGCMask(typ), j/8)>>(j%8)&1 != 0
 			}
 		}
 		if want {
@@ -915,7 +912,7 @@ func doubleCheckHeapPointersInterior(x, interior, size, dataSize uintptr, typ *_
 
 //go:nosplit
 func doubleCheckTypePointersOfType(s *mspan, typ *_type, addr, size uintptr) {
-	if typ == nil || typ.Kind_&abi.KindGCProg != 0 {
+	if typ == nil {
 		return
 	}
 	if typ.Kind_&abi.KindMask == abi.Interface {
@@ -1365,9 +1362,6 @@ func bulkBarrierBitmap(dst, src, size, maskOffset uintptr, bits *uint8) {
 //
 // The type typ must correspond exactly to [src, src+size) and [dst, dst+size).
 // dst, src, and size must be pointer-aligned.
-// The type typ must have a plain bitmap, not a GC program.
-// The only use of this function is in channel sends, and the
-// 64 kB channel element limit takes care of this for us.
 //
 // Must not be preempted because it typically runs right before memmove,
 // and the GC must observe them as an atomic action.
@@ -1383,14 +1377,10 @@ func typeBitsBulkBarrier(typ *_type, dst, src, size uintptr) {
 		println("runtime: typeBitsBulkBarrier with type ", toRType(typ).string(), " of size ", typ.Size_, " but memory size", size)
 		throw("runtime: invalid typeBitsBulkBarrier")
 	}
-	if typ.Kind_&abi.KindGCProg != 0 {
-		println("runtime: typeBitsBulkBarrier with type ", toRType(typ).string(), " with GC prog")
-		throw("runtime: invalid typeBitsBulkBarrier")
-	}
 	if !writeBarrier.enabled {
 		return
 	}
-	ptrmask := typ.GCData
+	ptrmask := getGCMask(typ)
 	buf := &getg().m.p.ptr().wbBuf
 	var bits uint32
 	for i := uintptr(0); i < typ.PtrBytes; i += goarch.PtrSize {
@@ -1475,6 +1465,9 @@ func progToPointerMask(prog *byte, size uintptr) bitvector {
 //	0nnnnnnn: emit n bits copied from the next (n+7)/8 bytes
 //	10000000 n c: repeat the previous n bits c times; n, c are varints
 //	1nnnnnnn c: repeat the previous n bits c times; c is a varint
+//
+// Currently, gc programs are only used for describing data and bss
+// sections of the binary.
 
 // runGCProg returns the number of 1-bit entries written to memory.
 func runGCProg(prog, dst *byte) uintptr {
@@ -1671,24 +1664,6 @@ Run:
 	return totalBits
 }
 
-// materializeGCProg allocates space for the (1-bit) pointer bitmask
-// for an object of size ptrdata.  Then it fills that space with the
-// pointer bitmask specified by the program prog.
-// The bitmask starts at s.startAddr.
-// The result must be deallocated with dematerializeGCProg.
-func materializeGCProg(ptrdata uintptr, prog *byte) *mspan {
-	// Each word of ptrdata needs one bit in the bitmap.
-	bitmapBytes := divRoundUp(ptrdata, 8*goarch.PtrSize)
-	// Compute the number of pages needed for bitmapBytes.
-	pages := divRoundUp(bitmapBytes, pageSize)
-	s := mheap_.allocManual(pages, spanAllocPtrScalarBits)
-	runGCProg(addb(prog, 4), (*byte)(unsafe.Pointer(s.startAddr)))
-	return s
-}
-func dematerializeGCProg(s *mspan) {
-	mheap_.freeManual(s, spanAllocPtrScalarBits)
-}
-
 func dumpGCProg(p *byte) {
 	nptr := 0
 	for {
@@ -1741,13 +1716,13 @@ func dumpGCProg(p *byte) {
 //
 //go:linkname reflect_gcbits reflect.gcbits
 func reflect_gcbits(x any) []byte {
-	return getgcmask(x)
+	return pointerMask(x)
 }
 
 // Returns GC type info for the pointer stored in ep for testing.
 // If ep points to the stack, only static live information will be returned
 // (i.e. not for objects which are only dynamically live stack objects).
-func getgcmask(ep any) (mask []byte) {
+func pointerMask(ep any) (mask []byte) {
 	e := *efaceOf(&ep)
 	p := e.data
 	t := e._type
@@ -1823,50 +1798,48 @@ func getgcmask(ep any) (mask []byte) {
 			maskFromHeap = maskFromHeap[:len(maskFromHeap)-1]
 		}
 
-		if et.Kind_&abi.KindGCProg == 0 {
-			// Unroll again, but this time from the type information.
-			maskFromType := make([]byte, (limit-base)/goarch.PtrSize)
-			tp = s.typePointersOfType(et, base)
-			for {
-				var addr uintptr
-				if tp, addr = tp.next(limit); addr == 0 {
-					break
-				}
-				maskFromType[(addr-base)/goarch.PtrSize] = 1
+		// Unroll again, but this time from the type information.
+		maskFromType := make([]byte, (limit-base)/goarch.PtrSize)
+		tp = s.typePointersOfType(et, base)
+		for {
+			var addr uintptr
+			if tp, addr = tp.next(limit); addr == 0 {
+				break
 			}
+			maskFromType[(addr-base)/goarch.PtrSize] = 1
+		}
 
-			// Validate that the prefix of maskFromType is equal to
-			// maskFromHeap. maskFromType may contain more pointers than
-			// maskFromHeap produces because maskFromHeap may be able to
-			// get exact type information for certain classes of objects.
-			// With maskFromType, we're always just tiling the type bitmap
-			// through to the elemsize.
-			//
-			// It's OK if maskFromType has pointers in elemsize that extend
-			// past the actual populated space; we checked above that all
-			// that space is zeroed, so just the GC will just see nil pointers.
-			differs := false
-			for i := range maskFromHeap {
-				if maskFromHeap[i] != maskFromType[i] {
-					differs = true
-					break
-				}
+		// Validate that the prefix of maskFromType is equal to
+		// maskFromHeap. maskFromType may contain more pointers than
+		// maskFromHeap produces because maskFromHeap may be able to
+		// get exact type information for certain classes of objects.
+		// With maskFromType, we're always just tiling the type bitmap
+		// through to the elemsize.
+		//
+		// It's OK if maskFromType has pointers in elemsize that extend
+		// past the actual populated space; we checked above that all
+		// that space is zeroed, so just the GC will just see nil pointers.
+		differs := false
+		for i := range maskFromHeap {
+			if maskFromHeap[i] != maskFromType[i] {
+				differs = true
+				break
 			}
+		}
 
-			if differs {
-				print("runtime: heap mask=")
-				for _, b := range maskFromHeap {
-					print(b)
-				}
-				println()
-				print("runtime: type mask=")
-				for _, b := range maskFromType {
-					print(b)
-				}
-				println()
-				print("runtime: type=", toRType(et).string(), "\n")
-				throw("found two different masks from two different methods")
+		if differs {
+			print("runtime: heap mask=")
+			for _, b := range maskFromHeap {
+				print(b)
 			}
+			println()
+			print("runtime: type mask=")
+			for _, b := range maskFromType {
+				print(b)
+			}
+			println()
+			print("runtime: type=", toRType(et).string(), "\n")
+			throw("found two different masks from two different methods")
 		}
 
 		// Select the heap mask to return. We may not have a type mask.
diff --git a/src/runtime/mcache.go b/src/runtime/mcache.go
index e8da133a..44d737b1 100644
--- a/src/runtime/mcache.go
+++ b/src/runtime/mcache.go
@@ -6,7 +6,7 @@ package runtime
 
 import (
 	"internal/runtime/atomic"
-	"runtime/internal/sys"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
@@ -21,8 +21,9 @@ type mcache struct {
 
 	// The following members are accessed on every malloc,
 	// so they are grouped here for better caching.
-	nextSample uintptr // trigger heap sample after allocating this many bytes
-	scanAlloc  uintptr // bytes of scannable heap allocated
+	nextSample  int64   // trigger heap sample after allocating this many bytes
+	memProfRate int     // cached mem profile rate, used to detect changes
+	scanAlloc   uintptr // bytes of scannable heap allocated
 
 	// Allocator cache for tiny objects w/o pointers.
 	// See "Tiny allocator" comment in malloc.go.
@@ -252,7 +253,7 @@ func (c *mcache) allocLarge(size uintptr, noscan bool) *mspan {
 	// visible to the background sweeper.
 	mheap_.central[spc].mcentral.fullSwept(mheap_.sweepgen).push(s)
 	s.limit = s.base() + size
-	s.initHeapBits(false)
+	s.initHeapBits()
 	return s
 }
 
diff --git a/src/runtime/mcentral.go b/src/runtime/mcentral.go
index bf597e19..08ff0a5c 100644
--- a/src/runtime/mcentral.go
+++ b/src/runtime/mcentral.go
@@ -14,7 +14,7 @@ package runtime
 
 import (
 	"internal/runtime/atomic"
-	"runtime/internal/sys"
+	"internal/runtime/sys"
 )
 
 // Central list of free objects of a given size.
@@ -260,6 +260,6 @@ func (c *mcentral) grow() *mspan {
 	// n := (npages << _PageShift) / size
 	n := s.divideByElemSize(npages << _PageShift)
 	s.limit = s.base() + size*n
-	s.initHeapBits(false)
+	s.initHeapBits()
 	return s
 }
diff --git a/src/runtime/mcheckmark.go b/src/runtime/mcheckmark.go
index 258f8892..f5560cf5 100644
--- a/src/runtime/mcheckmark.go
+++ b/src/runtime/mcheckmark.go
@@ -15,7 +15,7 @@ package runtime
 import (
 	"internal/goarch"
 	"internal/runtime/atomic"
-	"runtime/internal/sys"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
diff --git a/src/runtime/mcleanup.go b/src/runtime/mcleanup.go
new file mode 100644
index 00000000..972532d4
--- /dev/null
+++ b/src/runtime/mcleanup.go
@@ -0,0 +1,191 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package runtime
+
+import (
+	"internal/abi"
+	"unsafe"
+)
+
+// AddCleanup attaches a cleanup function to ptr. Some time after ptr is no longer
+// reachable, the runtime will call cleanup(arg) in a separate goroutine.
+//
+// A typical use is that ptr is an object wrapping an underlying resource (e.g.,
+// a File object wrapping an OS file descriptor), arg is the underlying resource
+// (e.g., the OS file descriptor), and the cleanup function releases the underlying
+// resource (e.g., by calling the close system call).
+//
+// There are few constraints on ptr. In particular, multiple cleanups may be
+// attached to the same pointer, or to different pointers within the same
+// allocation.
+//
+// If ptr is reachable from cleanup or arg, ptr will never be collected
+// and the cleanup will never run. As a protection against simple cases of this,
+// AddCleanup panics if arg is equal to ptr.
+//
+// There is no specified order in which cleanups will run.
+// In particular, if several objects point to each other and all become
+// unreachable at the same time, their cleanups all become eligible to run
+// and can run in any order. This is true even if the objects form a cycle.
+//
+// A single goroutine runs all cleanup calls for a program, sequentially. If a
+// cleanup function must run for a long time, it should create a new goroutine.
+//
+// If ptr has both a cleanup and a finalizer, the cleanup will only run once
+// it has been finalized and becomes unreachable without an associated finalizer.
+//
+// The cleanup(arg) call is not always guaranteed to run; in particular it is not
+// guaranteed to run before program exit.
+//
+// Cleanups are not guaranteed to run if the size of T is zero bytes, because
+// it may share same address with other zero-size objects in memory. See
+// https://go.dev/ref/spec#Size_and_alignment_guarantees.
+//
+// It is not guaranteed that a cleanup will run for objects allocated
+// in initializers for package-level variables. Such objects may be
+// linker-allocated, not heap-allocated.
+//
+// Note that because cleanups may execute arbitrarily far into the future
+// after an object is no longer referenced, the runtime is allowed to perform
+// a space-saving optimization that batches objects together in a single
+// allocation slot. The cleanup for an unreferenced object in such an
+// allocation may never run if it always exists in the same batch as a
+// referenced object. Typically, this batching only happens for tiny
+// (on the order of 16 bytes or less) and pointer-free objects.
+//
+// A cleanup may run as soon as an object becomes unreachable.
+// In order to use cleanups correctly, the program must ensure that
+// the object is reachable until it is safe to run its cleanup.
+// Objects stored in global variables, or that can be found by tracing
+// pointers from a global variable, are reachable. A function argument or
+// receiver may become unreachable at the last point where the function
+// mentions it. To ensure a cleanup does not get called prematurely,
+// pass the object to the [KeepAlive] function after the last point
+// where the object must remain reachable.
+func AddCleanup[T, S any](ptr *T, cleanup func(S), arg S) Cleanup {
+	// Explicitly force ptr to escape to the heap.
+	ptr = abi.Escape(ptr)
+
+	// The pointer to the object must be valid.
+	if ptr == nil {
+		panic("runtime.AddCleanup: ptr is nil")
+	}
+	usptr := uintptr(unsafe.Pointer(ptr))
+
+	// Check that arg is not equal to ptr.
+	if kind := abi.TypeOf(arg).Kind(); kind == abi.Pointer || kind == abi.UnsafePointer {
+		if unsafe.Pointer(ptr) == *((*unsafe.Pointer)(unsafe.Pointer(&arg))) {
+			panic("runtime.AddCleanup: ptr is equal to arg, cleanup will never run")
+		}
+	}
+	if inUserArenaChunk(usptr) {
+		// Arena-allocated objects are not eligible for cleanup.
+		panic("runtime.AddCleanup: ptr is arena-allocated")
+	}
+	if debug.sbrk != 0 {
+		// debug.sbrk never frees memory, so no cleanup will ever run
+		// (and we don't have the data structures to record them).
+		// Return a noop cleanup.
+		return Cleanup{}
+	}
+
+	fn := func() {
+		cleanup(arg)
+	}
+	// Closure must escape.
+	fv := *(**funcval)(unsafe.Pointer(&fn))
+	fv = abi.Escape(fv)
+
+	// Find the containing object.
+	base, _, _ := findObject(usptr, 0, 0)
+	if base == 0 {
+		if isGoPointerWithoutSpan(unsafe.Pointer(ptr)) {
+			// Cleanup is a noop.
+			return Cleanup{}
+		}
+		panic("runtime.AddCleanup: ptr not in allocated block")
+	}
+
+	// Ensure we have a finalizer processing goroutine running.
+	createfing()
+
+	id := addCleanup(unsafe.Pointer(ptr), fv)
+	return Cleanup{
+		id:  id,
+		ptr: usptr,
+	}
+}
+
+// Cleanup is a handle to a cleanup call for a specific object.
+type Cleanup struct {
+	// id is the unique identifier for the cleanup within the arena.
+	id uint64
+	// ptr contains the pointer to the object.
+	ptr uintptr
+}
+
+// Stop cancels the cleanup call. Stop will have no effect if the cleanup call
+// has already been queued for execution (because ptr became unreachable).
+// To guarantee that Stop removes the cleanup function, the caller must ensure
+// that the pointer that was passed to AddCleanup is reachable across the call to Stop.
+func (c Cleanup) Stop() {
+	if c.id == 0 {
+		// id is set to zero when the cleanup is a noop.
+		return
+	}
+
+	// The following block removes the Special record of type cleanup for the object c.ptr.
+	span := spanOfHeap(uintptr(unsafe.Pointer(c.ptr)))
+	if span == nil {
+		return
+	}
+	// Ensure that the span is swept.
+	// Sweeping accesses the specials list w/o locks, so we have
+	// to synchronize with it. And it's just much safer.
+	mp := acquirem()
+	span.ensureSwept()
+
+	offset := uintptr(unsafe.Pointer(c.ptr)) - span.base()
+
+	var found *special
+	lock(&span.speciallock)
+
+	iter, exists := span.specialFindSplicePoint(offset, _KindSpecialCleanup)
+	if exists {
+		for {
+			s := *iter
+			if s == nil {
+				// Reached the end of the linked list. Stop searching at this point.
+				break
+			}
+			if offset == uintptr(s.offset) && _KindSpecialCleanup == s.kind &&
+				(*specialCleanup)(unsafe.Pointer(s)).id == c.id {
+				// The special is a cleanup and contains a matching cleanup id.
+				*iter = s.next
+				found = s
+				break
+			}
+			if offset < uintptr(s.offset) || (offset == uintptr(s.offset) && _KindSpecialCleanup < s.kind) {
+				// The special is outside the region specified for that kind of
+				// special. The specials are sorted by kind.
+				break
+			}
+			// Try the next special.
+			iter = &s.next
+		}
+	}
+	if span.specials == nil {
+		spanHasNoSpecials(span)
+	}
+	unlock(&span.speciallock)
+	releasem(mp)
+
+	if found == nil {
+		return
+	}
+	lock(&mheap_.speciallock)
+	mheap_.specialCleanupAlloc.free(unsafe.Pointer(found))
+	unlock(&mheap_.speciallock)
+}
diff --git a/src/runtime/mcleanup_test.go b/src/runtime/mcleanup_test.go
new file mode 100644
index 00000000..d62356fe
--- /dev/null
+++ b/src/runtime/mcleanup_test.go
@@ -0,0 +1,298 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package runtime_test
+
+import (
+	"runtime"
+	"testing"
+	"unsafe"
+)
+
+func TestCleanup(t *testing.T) {
+	ch := make(chan bool, 1)
+	done := make(chan bool, 1)
+	want := 97531
+	go func() {
+		// allocate struct with pointer to avoid hitting tinyalloc.
+		// Otherwise we can't be sure when the allocation will
+		// be freed.
+		type T struct {
+			v int
+			p unsafe.Pointer
+		}
+		v := &new(T).v
+		*v = 97531
+		cleanup := func(x int) {
+			if x != want {
+				t.Errorf("cleanup %d, want %d", x, want)
+			}
+			ch <- true
+		}
+		runtime.AddCleanup(v, cleanup, 97531)
+		v = nil
+		done <- true
+	}()
+	<-done
+	runtime.GC()
+	<-ch
+}
+
+func TestCleanupMultiple(t *testing.T) {
+	ch := make(chan bool, 3)
+	done := make(chan bool, 1)
+	want := 97531
+	go func() {
+		// allocate struct with pointer to avoid hitting tinyalloc.
+		// Otherwise we can't be sure when the allocation will
+		// be freed.
+		type T struct {
+			v int
+			p unsafe.Pointer
+		}
+		v := &new(T).v
+		*v = 97531
+		cleanup := func(x int) {
+			if x != want {
+				t.Errorf("cleanup %d, want %d", x, want)
+			}
+			ch <- true
+		}
+		runtime.AddCleanup(v, cleanup, 97531)
+		runtime.AddCleanup(v, cleanup, 97531)
+		runtime.AddCleanup(v, cleanup, 97531)
+		v = nil
+		done <- true
+	}()
+	<-done
+	runtime.GC()
+	<-ch
+	<-ch
+	<-ch
+}
+
+func TestCleanupZeroSizedStruct(t *testing.T) {
+	type Z struct{}
+	z := new(Z)
+	runtime.AddCleanup(z, func(s string) {}, "foo")
+}
+
+func TestCleanupAfterFinalizer(t *testing.T) {
+	ch := make(chan int, 2)
+	done := make(chan bool, 1)
+	want := 97531
+	go func() {
+		// allocate struct with pointer to avoid hitting tinyalloc.
+		// Otherwise we can't be sure when the allocation will
+		// be freed.
+		type T struct {
+			v int
+			p unsafe.Pointer
+		}
+		v := &new(T).v
+		*v = 97531
+		finalizer := func(x *int) {
+			ch <- 1
+		}
+		cleanup := func(x int) {
+			if x != want {
+				t.Errorf("cleanup %d, want %d", x, want)
+			}
+			ch <- 2
+		}
+		runtime.AddCleanup(v, cleanup, 97531)
+		runtime.SetFinalizer(v, finalizer)
+		v = nil
+		done <- true
+	}()
+	<-done
+	runtime.GC()
+	var result int
+	result = <-ch
+	if result != 1 {
+		t.Errorf("result %d, want 1", result)
+	}
+	runtime.GC()
+	result = <-ch
+	if result != 2 {
+		t.Errorf("result %d, want 2", result)
+	}
+}
+
+func TestCleanupInteriorPointer(t *testing.T) {
+	ch := make(chan bool, 3)
+	done := make(chan bool, 1)
+	want := 97531
+	go func() {
+		// Allocate struct with pointer to avoid hitting tinyalloc.
+		// Otherwise we can't be sure when the allocation will
+		// be freed.
+		type T struct {
+			p unsafe.Pointer
+			i int
+			a int
+			b int
+			c int
+		}
+		ts := new(T)
+		ts.a = 97531
+		ts.b = 97531
+		ts.c = 97531
+		cleanup := func(x int) {
+			if x != want {
+				t.Errorf("cleanup %d, want %d", x, want)
+			}
+			ch <- true
+		}
+		runtime.AddCleanup(&ts.a, cleanup, 97531)
+		runtime.AddCleanup(&ts.b, cleanup, 97531)
+		runtime.AddCleanup(&ts.c, cleanup, 97531)
+		ts = nil
+		done <- true
+	}()
+	<-done
+	runtime.GC()
+	<-ch
+	<-ch
+	<-ch
+}
+
+func TestCleanupStop(t *testing.T) {
+	done := make(chan bool, 1)
+	go func() {
+		// allocate struct with pointer to avoid hitting tinyalloc.
+		// Otherwise we can't be sure when the allocation will
+		// be freed.
+		type T struct {
+			v int
+			p unsafe.Pointer
+		}
+		v := &new(T).v
+		*v = 97531
+		cleanup := func(x int) {
+			t.Error("cleanup called, want no cleanup called")
+		}
+		c := runtime.AddCleanup(v, cleanup, 97531)
+		c.Stop()
+		v = nil
+		done <- true
+	}()
+	<-done
+	runtime.GC()
+}
+
+func TestCleanupStopMultiple(t *testing.T) {
+	done := make(chan bool, 1)
+	go func() {
+		// allocate struct with pointer to avoid hitting tinyalloc.
+		// Otherwise we can't be sure when the allocation will
+		// be freed.
+		type T struct {
+			v int
+			p unsafe.Pointer
+		}
+		v := &new(T).v
+		*v = 97531
+		cleanup := func(x int) {
+			t.Error("cleanup called, want no cleanup called")
+		}
+		c := runtime.AddCleanup(v, cleanup, 97531)
+		c.Stop()
+		c.Stop()
+		c.Stop()
+		v = nil
+		done <- true
+	}()
+	<-done
+	runtime.GC()
+}
+
+func TestCleanupStopinterleavedMultiple(t *testing.T) {
+	ch := make(chan bool, 3)
+	done := make(chan bool, 1)
+	go func() {
+		// allocate struct with pointer to avoid hitting tinyalloc.
+		// Otherwise we can't be sure when the allocation will
+		// be freed.
+		type T struct {
+			v int
+			p unsafe.Pointer
+		}
+		v := &new(T).v
+		*v = 97531
+		cleanup := func(x int) {
+			if x != 1 {
+				t.Error("cleanup called, want no cleanup called")
+			}
+			ch <- true
+		}
+		runtime.AddCleanup(v, cleanup, 1)
+		runtime.AddCleanup(v, cleanup, 2).Stop()
+		runtime.AddCleanup(v, cleanup, 1)
+		runtime.AddCleanup(v, cleanup, 2).Stop()
+		runtime.AddCleanup(v, cleanup, 1)
+		v = nil
+		done <- true
+	}()
+	<-done
+	runtime.GC()
+	<-ch
+	<-ch
+	<-ch
+}
+
+func TestCleanupStopAfterCleanupRuns(t *testing.T) {
+	ch := make(chan bool, 1)
+	done := make(chan bool, 1)
+	var stop func()
+	go func() {
+		// Allocate struct with pointer to avoid hitting tinyalloc.
+		// Otherwise we can't be sure when the allocation will
+		// be freed.
+		type T struct {
+			v int
+			p unsafe.Pointer
+		}
+		v := &new(T).v
+		*v = 97531
+		cleanup := func(x int) {
+			ch <- true
+		}
+		cl := runtime.AddCleanup(v, cleanup, 97531)
+		v = nil
+		stop = cl.Stop
+		done <- true
+	}()
+	<-done
+	runtime.GC()
+	<-ch
+	stop()
+}
+
+func TestCleanupPointerEqualsArg(t *testing.T) {
+	// See go.dev/issue/71316
+	defer func() {
+		want := "runtime.AddCleanup: ptr is equal to arg, cleanup will never run"
+		if r := recover(); r == nil {
+			t.Error("want panic, test did not panic")
+		} else if r == want {
+			// do nothing
+		} else {
+			t.Errorf("wrong panic: want=%q, got=%q", want, r)
+		}
+	}()
+
+	// allocate struct with pointer to avoid hitting tinyalloc.
+	// Otherwise we can't be sure when the allocation will
+	// be freed.
+	type T struct {
+		v int
+		p unsafe.Pointer
+	}
+	v := &new(T).v
+	*v = 97531
+	runtime.AddCleanup(v, func(x *int) {}, v)
+	v = nil
+	runtime.GC()
+}
diff --git a/src/runtime/mem_nonsbrk.go b/src/runtime/mem_nonsbrk.go
new file mode 100644
index 00000000..41b7260e
--- /dev/null
+++ b/src/runtime/mem_nonsbrk.go
@@ -0,0 +1,15 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build !plan9 && !wasm
+
+package runtime
+
+import "unsafe"
+
+const isSbrkPlatform = false
+
+func sysReserveAlignedSbrk(size, align uintptr) (unsafe.Pointer, uintptr) {
+	panic("unreachable")
+}
diff --git a/src/runtime/mem_sbrk.go b/src/runtime/mem_sbrk.go
index dc0a764a..cfca8910 100644
--- a/src/runtime/mem_sbrk.go
+++ b/src/runtime/mem_sbrk.go
@@ -8,10 +8,32 @@ package runtime
 
 import "unsafe"
 
+const isSbrkPlatform = true
+
 const memDebug = false
 
-var bloc uintptr
-var blocMax uintptr
+// Memory management on sbrk systems (including the linear memory
+// on Wasm).
+
+// bloc is the runtime's sense of the break, which can go up or
+// down. blocMax is the system's break, also the high water mark
+// of bloc. The runtime uses memory up to bloc. The memory
+// between bloc and blocMax is allocated by the OS but not used
+// by the runtime.
+//
+// When the runtime needs to grow the heap address range, it
+// increases bloc. When it needs to grow beyond blocMax, it calls
+// the system sbrk to allocate more memory (and therefore
+// increase blocMax).
+//
+// When the runtime frees memory at the end of the address space,
+// it decreases bloc, but does not reduces the system break (as
+// the OS doesn't support it). When the runtime frees memory in
+// the middle of the address space, the memory goes to a free
+// list.
+
+var bloc uintptr    // The runtime's sense of break. Can go up or down.
+var blocMax uintptr // The break of the OS. Only increase.
 var memlock mutex
 
 type memHdr struct {
@@ -27,6 +49,13 @@ func (p memHdrPtr) ptr() *memHdr   { return (*memHdr)(unsafe.Pointer(p)) }
 func (p *memHdrPtr) set(x *memHdr) { *p = memHdrPtr(unsafe.Pointer(x)) }
 
 func memAlloc(n uintptr) unsafe.Pointer {
+	if p := memAllocNoGrow(n); p != nil {
+		return p
+	}
+	return sbrk(n)
+}
+
+func memAllocNoGrow(n uintptr) unsafe.Pointer {
 	n = memRound(n)
 	var prevp *memHdr
 	for p := memFreelist.ptr(); p != nil; p = p.next.ptr() {
@@ -46,7 +75,7 @@ func memAlloc(n uintptr) unsafe.Pointer {
 		}
 		prevp = p
 	}
-	return sbrk(n)
+	return nil
 }
 
 func memFree(ap unsafe.Pointer, n uintptr) {
@@ -187,3 +216,34 @@ func sysReserveOS(v unsafe.Pointer, n uintptr) unsafe.Pointer {
 	unlock(&memlock)
 	return p
 }
+
+func sysReserveAlignedSbrk(size, align uintptr) (unsafe.Pointer, uintptr) {
+	lock(&memlock)
+	if p := memAllocNoGrow(size + align); p != nil {
+		// We can satisfy the reservation from the free list.
+		// Trim off the unaligned parts.
+		pAligned := alignUp(uintptr(p), align)
+		if startLen := pAligned - uintptr(p); startLen > 0 {
+			memFree(p, startLen)
+		}
+		end := pAligned + size
+		if endLen := (uintptr(p) + size + align) - end; endLen > 0 {
+			memFree(unsafe.Pointer(end), endLen)
+		}
+		memCheck()
+		return unsafe.Pointer(pAligned), size
+	}
+
+	// Round up bloc to align, then allocate size.
+	p := alignUp(bloc, align)
+	r := sbrk(p + size - bloc)
+	if r == nil {
+		p, size = 0, 0
+	} else if l := p - uintptr(r); l > 0 {
+		// Free the area we skipped over for alignment.
+		memFree(r, l)
+		memCheck()
+	}
+	unlock(&memlock)
+	return unsafe.Pointer(p), size
+}
diff --git a/src/runtime/mem_wasm.go b/src/runtime/mem_wasm.go
index d9d32705..76de88ac 100644
--- a/src/runtime/mem_wasm.go
+++ b/src/runtime/mem_wasm.go
@@ -7,14 +7,21 @@ package runtime
 import "unsafe"
 
 func sbrk(n uintptr) unsafe.Pointer {
-	grow := divRoundUp(n, physPageSize)
-	size := growMemory(int32(grow))
-	if size < 0 {
-		return nil
+	bl := bloc
+	n = memRound(n)
+	if bl+n > blocMax {
+		grow := (bl + n - blocMax) / physPageSize
+		size := growMemory(int32(grow))
+		if size < 0 {
+			return nil
+		}
+		resetMemoryDataView()
+		blocMax = bl + n
 	}
-	resetMemoryDataView()
-	return unsafe.Pointer(uintptr(size) * physPageSize)
+	bloc += n
+	return unsafe.Pointer(bl)
 }
 
 // Implemented in src/runtime/sys_wasm.s
 func growMemory(pages int32) int32
+func currentMemory() int32
diff --git a/src/runtime/memclr_arm64.s b/src/runtime/memclr_arm64.s
index 1c35dfe0..3e49f7fc 100644
--- a/src/runtime/memclr_arm64.s
+++ b/src/runtime/memclr_arm64.s
@@ -82,6 +82,7 @@ last16:
 last_end:
 	RET
 
+	PCALIGN	$16
 no_zva:
 	SUB	$16, R0, R0
 	SUB	$64, R1, R1
@@ -98,6 +99,7 @@ loop_64:
 	BNE	tail63
 	RET
 
+	PCALIGN	$16
 try_zva:
 	// Try using the ZVA feature to zero entire cache lines
 	// It is not meaningful to use ZVA if the block size is less than 64,
@@ -124,6 +126,7 @@ try_zva:
 	MOVW	R5, block_size<>(SB)
 	B	no_zva
 
+	PCALIGN	$16
 init:
 	MOVW	$4, R9
 	ANDW	$15, R3, R5
@@ -134,6 +137,7 @@ init:
 	// Block size is less than 64.
 	BNE	no_zva
 
+	PCALIGN	$16
 zero_by_line:
 	CMP	R5, R1
 	// Not enough memory to reach alignment
@@ -170,6 +174,7 @@ loop_zva_prolog:
 aligned:
 	SUB	R5, R1, R1
 
+	PCALIGN	$16
 loop_zva:
 	WORD	$0xd50b7420 // DC ZVA, R0
 	ADD	R5, R0, R0
diff --git a/src/runtime/memclr_loong64.s b/src/runtime/memclr_loong64.s
index 1d45e82d..346b210c 100644
--- a/src/runtime/memclr_loong64.s
+++ b/src/runtime/memclr_loong64.s
@@ -5,36 +5,131 @@
 #include "go_asm.h"
 #include "textflag.h"
 
+// Register map
+//
+// R4: ptr
+// R5: n
+// R6: ptrend
+// R7: tmp
+
+// Algorithm:
+//
+// 1. when count <= 64 bytes, memory alignment check is omitted.
+// The handling is divided into distinct cases based on the size
+// of count: clr_0, clr_1, clr_2, clr_3, clr_4, clr_5through7,
+// clr_8, clr_9through16, clr_17through32, and clr_33through64.
+//
+// 2. when count > 64 bytes, memory alignment check is performed.
+// Unaligned bytes are processed first (that is, 8-(ptr&7)), and
+// then a 64-byte loop is executed to zero out memory.
+// When the number of remaining bytes not cleared is n < 64 bytes,
+// a tail processing is performed, invoking the corresponding case
+// based on the size of n.
+//
+//    ptr           newptr                           ptrend
+//     |               |<----count after correction---->|
+//     |<-------------count before correction---------->|
+//     |<--8-(ptr&7)-->|               |<---64 bytes--->|
+//     +------------------------------------------------+
+//     |   Head        |      Body     |      Tail      |
+//     +---------------+---------------+----------------+
+//    newptr = ptr - (ptr & 7) + 8
+//    count = count - 8 + (ptr & 7)
+
 // func memclrNoHeapPointers(ptr unsafe.Pointer, n uintptr)
 TEXT runtime·memclrNoHeapPointers(SB),NOSPLIT,$0-16
+	BEQ	R5, clr_0
 	ADDV	R4, R5, R6
 
-	// if less than 8 bytes, do one byte at a time
-	SGTU	$8, R5, R8
-	BNE	R8, out
+tail:
+	// <=64 bytes, clear directly, not check aligned
+	SGTU	$2, R5, R7
+	BNE	R7, clr_1
+	SGTU	$3, R5, R7
+	BNE	R7, clr_2
+	SGTU	$4, R5, R7
+	BNE	R7, clr_3
+	SGTU	$5, R5, R7
+	BNE	R7, clr_4
+	SGTU	$8, R5, R7
+	BNE	R7, clr_5through7
+	SGTU	$9, R5, R7
+	BNE	R7, clr_8
+	SGTU	$17, R5, R7
+	BNE	R7, clr_9through16
+	SGTU	$33, R5, R7
+	BNE	R7, clr_17through32
+	SGTU	$65, R5, R7
+	BNE	R7, clr_33through64
 
-	// do one byte at a time until 8-aligned
-	AND	$7, R4, R8
-	BEQ	R8, words
-	MOVB	R0, (R4)
-	ADDV	$1, R4
-	JMP	-4(PC)
+	// n > 64 bytes, check aligned
+	AND	$7, R4, R7
+	BEQ	R7, body
 
-words:
-	// do 8 bytes at a time if there is room
-	ADDV	$-7, R6, R5
-
-	PCALIGN	$16
-	SGTU	R5, R4, R8
-	BEQ	R8, out
+head:
 	MOVV	R0, (R4)
-	ADDV	$8, R4
-	JMP	-4(PC)
+	SUBV	R7, R4
+	ADDV	R7, R5
+	ADDV	$8, R4	// newptr = ptr + (8 - (ptr & 7))
+	SUBV	$8, R5	// newn = n - (8 - (ptr & 7))
+	SGTU	$65, R5, R7
+	BNE	R7, clr_33through64
 
-out:
-	BEQ	R4, R6, done
-	MOVB	R0, (R4)
-	ADDV	$1, R4
-	JMP	-3(PC)
-done:
+body:
+	MOVV	R0, (R4)
+	MOVV	R0, 8(R4)
+	MOVV	R0, 16(R4)
+	MOVV	R0, 24(R4)
+	MOVV	R0, 32(R4)
+	MOVV	R0, 40(R4)
+	MOVV	R0, 48(R4)
+	MOVV	R0, 56(R4)
+	ADDV	$-64, R5
+	ADDV	$64, R4
+	SGTU	$65, R5, R7
+	BEQ	R7, body
+	BEQ	R5, clr_0
+	JMP	tail
+
+clr_0:
+	RET
+clr_1:
+	MOVB	R0, (R4)
+	RET
+clr_2:
+	MOVH	R0, (R4)
+	RET
+clr_3:
+	MOVH	R0, (R4)
+	MOVB	R0, 2(R4)
+	RET
+clr_4:
+	MOVW	R0, (R4)
+	RET
+clr_5through7:
+	MOVW	R0, (R4)
+	MOVW	R0, -4(R6)
+	RET
+clr_8:
+	MOVV	R0, (R4)
+	RET
+clr_9through16:
+	MOVV	R0, (R4)
+	MOVV	R0, -8(R6)
+	RET
+clr_17through32:
+	MOVV	R0, (R4)
+	MOVV	R0, 8(R4)
+	MOVV	R0, -16(R6)
+	MOVV	R0, -8(R6)
+	RET
+clr_33through64:
+	MOVV	R0, (R4)
+	MOVV	R0, 8(R4)
+	MOVV	R0, 16(R4)
+	MOVV	R0, 24(R4)
+	MOVV	R0, -32(R6)
+	MOVV	R0, -24(R6)
+	MOVV	R0, -16(R6)
+	MOVV	R0, -8(R6)
 	RET
diff --git a/src/runtime/memclr_ppc64x.s b/src/runtime/memclr_ppc64x.s
index bc4b3fc2..ffe40e12 100644
--- a/src/runtime/memclr_ppc64x.s
+++ b/src/runtime/memclr_ppc64x.s
@@ -19,7 +19,7 @@ check:
 	SRD   $3, R4, R6  // R6: double words to clear
 	CMP   R6, $0, CR1 // CR1[EQ] set if no double words
 
-	BC    12, 6, nozerolarge // only single bytes
+	BEQ   CR1, nozerolarge // only single bytes
 	CMP   R4, $512
 	BLT   under512           // special case for < 512
 	ANDCC $127, R3, R8       // check for 128 alignment of address
@@ -104,7 +104,7 @@ lt16gt8:
 #endif
 nozerolarge:
 	ANDCC $7, R4, R5 // any remaining bytes
-	BC    4, 1, LR   // ble lr
+	BLE    CR0, LR   // ble lr
 #ifdef GOPPC64_power10
 	XXLXOR  VS32, VS32, VS32 // clear VS32 (V0)
 	SLD	$56, R5, R7
@@ -124,7 +124,7 @@ next2:
 	ADD   $-2, R5
 next1:
 	CMP   R5, $0
-	BC    12, 2, LR      // beqlr
+	BEQ   CR0, LR      // beqlr
 	MOVB  R0, 0(R3)
 	RET
 #endif
diff --git a/src/runtime/memmove_amd64.s b/src/runtime/memmove_amd64.s
index 018bb0b1..8883b55e 100644
--- a/src/runtime/memmove_amd64.s
+++ b/src/runtime/memmove_amd64.s
@@ -72,9 +72,10 @@ tail:
 	CMPQ	BX, $256
 	JBE	move_129through256
 
-	TESTB	$1, runtime·useAVXmemmove(SB)
-	JNZ	avxUnaligned
-
+	MOVB	runtime·memmoveBits(SB), AX
+	// We have AVX but we don't want to use REP MOVSx.
+	CMPB	AX, $const_avxSupported
+	JEQ	avxUnaligned
 /*
  * check and set for backwards
  */
@@ -82,16 +83,23 @@ tail:
 	JLS	back
 
 /*
- * forward copy loop
- */
+* forward copy loop
+*/
 forward:
+	CMPQ	BX, $2048
+	JL	check_avx
+	// REP MOVSx is slow if destination address is unaligned.
+	TESTQ	$15,DI
+	JNZ	check_avx
+	TESTB	$const_repmovsPreferred, AX
+	JNZ	fwdBy8
+	// For backward copy, REP MOVSx performs worse than avx.
+check_avx:
+	TESTB	$const_avxSupported, AX
+	JNZ	avxUnaligned
+
 	CMPQ	BX, $2048
 	JLS	move_256through2048
-
-	// If REP MOVSB isn't fast, don't use it
-	CMPB	internal∕cpu·X86+const_offsetX86HasERMS(SB), $1 // enhanced REP MOVSB/STOSB
-	JNE	fwdBy8
-
 	// Check alignment
 	MOVL	SI, AX
 	ORL	DI, AX
@@ -104,12 +112,16 @@ forward:
 	RET
 
 fwdBy8:
+	// Loading the last (possibly partially overlapping) word and writing
+	// it at the end.
+	MOVQ	-8(SI)(BX*1), AX
+	LEAQ	-8(DI)(BX*1), DX
 	// Do 8 bytes at a time
-	MOVQ	BX, CX
+	LEAQ 	-1(BX),CX
 	SHRQ	$3, CX
-	ANDQ	$7, BX
 	REP;	MOVSQ
-	JMP	tail
+	MOVQ	AX, (DX)
+	RET
 
 back:
 /*
@@ -119,6 +131,9 @@ back:
 	ADDQ	BX, CX
 	CMPQ	CX, DI
 	JLS	forward
+
+	TESTB	$const_avxSupported, AX
+	JNZ	avxUnaligned
 /*
  * whole thing backwards has
  * adjusted addresses
diff --git a/src/runtime/memmove_linux_amd64_test.go b/src/runtime/memmove_linux_amd64_test.go
index 5f900623..c5588115 100644
--- a/src/runtime/memmove_linux_amd64_test.go
+++ b/src/runtime/memmove_linux_amd64_test.go
@@ -5,6 +5,7 @@
 package runtime_test
 
 import (
+	"internal/asan"
 	"os"
 	"syscall"
 	"testing"
@@ -14,6 +15,10 @@ import (
 // TestMemmoveOverflow maps 3GB of memory and calls memmove on
 // the corresponding slice.
 func TestMemmoveOverflow(t *testing.T) {
+	if asan.Enabled {
+		t.Skip("appears to break asan and causes spurious failures")
+	}
+
 	t.Parallel()
 	// Create a temporary file.
 	tmp, err := os.CreateTemp("", "go-memmovetest")
diff --git a/src/runtime/memmove_loong64.s b/src/runtime/memmove_loong64.s
index a94cf999..8827ca07 100644
--- a/src/runtime/memmove_loong64.s
+++ b/src/runtime/memmove_loong64.s
@@ -6,99 +6,266 @@
 
 // See memmove Go doc for important implementation constraints.
 
+// Register map
+//
+// to		R4
+// from		R5
+// n(aka count)	R6
+// to-end	R7
+// from-end	R8
+// data		R11-R18
+// tmp		R9
+
+// Algorithm:
+//
+// Memory alignment check is only performed for copy size greater
+// than 64 bytes to minimize overhead.
+//
+// when copy size <= 64 bytes, jump to label tail, according to the
+// copy size to select the appropriate case and copy directly.
+// Based on the common memory access instructions of loong64, the
+// currently implemented cases are:
+// move_0, move_1, move_2, move_3, move_4, move_5through7, move_8,
+// move_9through16, move_17through32, move_33through64
+//
+// when copy size > 64 bytes, use the destination-aligned copying,
+// adopt the following strategy to copy in 3 parts:
+// 1. Head: do the memory alignment
+// 2. Body: a 64-byte loop structure
+// 3. Tail: processing of the remaining part (<= 64 bytes)
+//
+// forward:
+//
+//    Dst           NewDst                           Dstend
+//     |               |<----count after correction---->|
+//     |<-------------count before correction---------->|
+//     |<--8-(Dst&7)-->|               |<---64 bytes--->|
+//     +------------------------------------------------+
+//     |   Head        |      Body     |      Tail      |
+//     +---------------+---------------+----------------+
+//    NewDst = Dst - (Dst & 7) + 8
+//    count = count - 8 + (Dst & 7)
+//    Src = Src - (Dst & 7) + 8
+//
+// backward:
+//
+//    Dst                             NewDstend          Dstend
+//     |<-----count after correction------>|                |
+//     |<------------count before correction--------------->|
+//     |<---64 bytes--->|                  |<---Dstend&7--->|
+//     +----------------------------------------------------+
+//     |   Tail         |      Body        |      Head      |
+//     +----------------+------------------+----------------+
+//    NewDstend = Dstend - (Dstend & 7)
+//    count = count - (Dstend & 7)
+//    Srcend = Srcend - (Dstend & 7)
+
 // func memmove(to, from unsafe.Pointer, n uintptr)
 TEXT runtime·memmove(SB), NOSPLIT|NOFRAME, $0-24
-	BNE	R6, check
-	RET
+	BEQ	R4, R5, move_0
+	BEQ	R6, move_0
 
-check:
-	SGTU	R4, R5, R7
-	BNE	R7, backward
+	ADDV	R4, R6, R7 // to-end pointer
+	ADDV	R5, R6, R8 // from-end pointer
 
-	ADDV	R4, R6, R9 // end pointer
+tail:
+	//copy size <= 64 bytes, copy directly, not check aligned
 
-	// if the two pointers are not of same alignments, do byte copying
-	SUBVU	R5, R4, R7
-	AND	$7, R7
-	BNE	R7, out
+	// < 2 bytes
+	SGTU	$2, R6, R9
+	BNE	R9, move_1
 
-	// if less than 8 bytes, do byte copying
-	SGTU	$8, R6, R7
-	BNE	R7, out
+	// < 3 bytes
+	SGTU	$3, R6, R9
+	BNE	R9, move_2
 
-	// do one byte at a time until 8-aligned
-	AND	$7, R4, R8
-	BEQ	R8, words
-	MOVB	(R5), R7
+	// < 4 bytes
+	SGTU	$4, R6, R9
+	BNE	R9, move_3
+
+	// < 5 bytes
+	SGTU	$5, R6, R9
+	BNE	R9, move_4
+
+	// >= 5 bytes and < 8 bytes
+	SGTU	$8, R6, R9
+	BNE	R9, move_5through7
+
+	// < 9 bytes
+	SGTU	$9, R6, R9
+	BNE	R9, move_8
+
+	// >= 9 bytes and < 17 bytes
+	SGTU	$17, R6, R9
+	BNE	R9, move_9through16
+
+	// >= 17 bytes and < 33 bytes
+	SGTU	$33, R6, R9
+	BNE	R9, move_17through32
+
+	// >= 33 bytes and < 65 bytes
+	SGTU	$65, R6, R9
+	BNE	R9, move_33through64
+
+	// if (dst > src) && (dst < src + count), regarded as memory
+	// overlap, jump to backward
+	// else, jump to forward
+	BGEU	R5, R4, forward
+	ADDV	R5, R6, R10
+	BLTU	R4, R10, backward
+
+forward:
+	AND	$7, R4, R9	// dst & 7
+	BEQ	R9, body
+head:
+	MOVV	$8, R10
+	SUBV	R9, R10		// head = 8 - (dst & 7)
+	MOVB	(R5), R11
+	SUBV	$1, R10
 	ADDV	$1, R5
-	MOVB	R7, (R4)
+	MOVB	R11, (R4)
 	ADDV	$1, R4
-	JMP	-6(PC)
+	BNE	R10, -5(PC)
+	ADDV	R9, R6
+	ADDV	$-8, R6		// newcount = count + (dst & 7) - 8
+	// if newcount < 65 bytes, use move_33through64 to copy is enough
+	SGTU	$65, R6, R9
+	BNE	R9, move_33through64
 
-words:
-	// do 8 bytes at a time if there is room
-	ADDV	$-7, R9, R6 // R6 is end pointer-7
-
-	PCALIGN	$16
-	SGTU	R6, R4, R8
-	BEQ	R8, out
-	MOVV	(R5), R7
-	ADDV	$8, R5
-	MOVV	R7, (R4)
-	ADDV	$8, R4
-	JMP	-6(PC)
-
-out:
-	BEQ	R4, R9, done
-	MOVB	(R5), R7
-	ADDV	$1, R5
-	MOVB	R7, (R4)
-	ADDV	$1, R4
-	JMP	-5(PC)
-done:
-	RET
+body:
+	MOVV	(R5), R11
+	MOVV	8(R5), R12
+	MOVV	16(R5), R13
+	MOVV	24(R5), R14
+	MOVV	32(R5), R15
+	MOVV	40(R5), R16
+	MOVV	48(R5), R17
+	MOVV	56(R5), R18
+	MOVV	R11, (R4)
+	MOVV	R12, 8(R4)
+	MOVV	R13, 16(R4)
+	MOVV	R14, 24(R4)
+	MOVV	R15, 32(R4)
+	MOVV	R16, 40(R4)
+	MOVV	R17, 48(R4)
+	MOVV	R18, 56(R4)
+	ADDV	$-64, R6
+	ADDV	$64, R4
+	ADDV	$64, R5
+	SGTU	$64, R6, R9
+	// if the remaining part >= 64 bytes, jmp to body
+	BEQ	R9, body
+	// if the remaining part == 0 bytes, use move_0 to return
+	BEQ	R6, move_0
+	// if the remaining part in (0, 63] bytes, jmp to tail
+	JMP	tail
 
+// The backward copy algorithm is the same as the forward copy,
+// except for the direction.
 backward:
-	ADDV	R6, R5 // from-end pointer
-	ADDV	R4, R6, R9 // to-end pointer
+	AND	$7, R7, R9	 // dstend & 7
+	BEQ	R9, b_body
+b_head:
+	MOVV	-8(R8), R11
+	SUBV	R9, R6		// newcount = count - (dstend & 7)
+	SUBV	R9, R8		// newsrcend = srcend - (dstend & 7)
+	MOVV	-8(R8), R12
+ 	MOVV	R11, -8(R7)
+	SUBV	R9, R7		// newdstend = dstend - (dstend & 7)
+ 	MOVV	R12, -8(R7)
+	SUBV	$8, R6
+	SUBV	$8, R7
+	SUBV	$8, R8
+	SGTU    $65, R6, R9
+	BNE     R9, move_33through64
 
-	// if the two pointers are not of same alignments, do byte copying
-	SUBVU	R9, R5, R7
-	AND	$7, R7
-	BNE	R7, out1
+b_body:
+	MOVV	-8(R8), R11
+	MOVV	-16(R8), R12
+	MOVV	-24(R8), R13
+	MOVV	-32(R8), R14
+	MOVV	-40(R8), R15
+	MOVV	-48(R8), R16
+	MOVV	-56(R8), R17
+	MOVV	-64(R8), R18
+	MOVV	R11, -8(R7)
+	MOVV	R12, -16(R7)
+	MOVV	R13, -24(R7)
+	MOVV	R14, -32(R7)
+	MOVV	R15, -40(R7)
+	MOVV	R16, -48(R7)
+	MOVV	R17, -56(R7)
+	MOVV	R18, -64(R7)
+	ADDV	$-64, R6
+	ADDV	$-64, R7
+	ADDV	$-64, R8
+	SGTU	$64, R6, R9
+	BEQ	R9, b_body
+	BEQ	R6, move_0
+	JMP	tail
 
-	// if less than 8 bytes, do byte copying
-	SGTU	$8, R6, R7
-	BNE	R7, out1
-
-	// do one byte at a time until 8-aligned
-	AND	$7, R9, R8
-	BEQ	R8, words1
-	ADDV	$-1, R5
-	MOVB	(R5), R7
-	ADDV	$-1, R9
-	MOVB	R7, (R9)
-	JMP	-6(PC)
-
-words1:
-	// do 8 bytes at a time if there is room
-	ADDV	$7, R4, R6 // R6 is start pointer+7
-
-	PCALIGN	$16
-	SGTU	R9, R6, R8
-	BEQ	R8, out1
-	ADDV	$-8, R5
-	MOVV	(R5), R7
-	ADDV	$-8, R9
-	MOVV	R7, (R9)
-	JMP	-6(PC)
-
-out1:
-	BEQ	R4, R9, done1
-	ADDV	$-1, R5
-	MOVB	(R5), R7
-	ADDV	$-1, R9
-	MOVB	R7, (R9)
-	JMP	-5(PC)
-done1:
+move_0:
+	RET
+
+move_1:
+	MOVB	(R5), R11
+	MOVB	R11, (R4)
+	RET
+move_2:
+	MOVH	(R5), R11
+	MOVH	R11, (R4)
+	RET
+move_3:
+	MOVH	(R5), R11
+	MOVB	-1(R8), R12
+	MOVH	R11, (R4)
+	MOVB	R12, -1(R7)
+	RET
+move_4:
+	MOVW	(R5), R11
+	MOVW	R11, (R4)
+	RET
+move_5through7:
+	MOVW	(R5), R11
+	MOVW	-4(R8), R12
+	MOVW	R11, (R4)
+	MOVW	R12, -4(R7)
+	RET
+move_8:
+	MOVV	(R5), R11
+	MOVV	R11, (R4)
+	RET
+move_9through16:
+	MOVV	(R5), R11
+	MOVV	-8(R8), R12
+	MOVV	R11, (R4)
+	MOVV	R12, -8(R7)
+	RET
+move_17through32:
+	MOVV	(R5), R11
+	MOVV	8(R5), R12
+	MOVV	-16(R8), R13
+	MOVV	-8(R8), R14
+	MOVV	R11, (R4)
+	MOVV	R12, 8(R4)
+	MOVV	R13, -16(R7)
+	MOVV	R14, -8(R7)
+	RET
+move_33through64:
+	MOVV	(R5), R11
+	MOVV	8(R5), R12
+	MOVV	16(R5), R13
+	MOVV	24(R5), R14
+	MOVV	-32(R8), R15
+	MOVV	-24(R8), R16
+	MOVV	-16(R8), R17
+	MOVV	-8(R8), R18
+	MOVV	R11, (R4)
+	MOVV	R12, 8(R4)
+	MOVV	R13, 16(R4)
+	MOVV	R14, 24(R4)
+	MOVV	R15, -32(R7)
+	MOVV	R16, -24(R7)
+	MOVV	R17, -16(R7)
+	MOVV	R18, -8(R7)
 	RET
diff --git a/src/runtime/memmove_ppc64x.s b/src/runtime/memmove_ppc64x.s
index 18b9c850..9892028d 100644
--- a/src/runtime/memmove_ppc64x.s
+++ b/src/runtime/memmove_ppc64x.s
@@ -60,11 +60,11 @@ mcopy:
 
 	SUB	SRC, TGT, TMP	// dest - src
 	CMPU	TMP, LEN, CR2	// < len?
-	BC	12, 8, backward // BLT CR2 backward
+	BLT	CR2, backward
 
 	// Copying forward if no overlap.
 
-	BC	12, 6, checkbytes	// BEQ CR1, checkbytes
+	BEQ	CR1, checkbytes
 	SRDCC	$3, DWORDS, OCTWORDS	// 64 byte chunks?
 	MOVD	$16, IDX16
 	BEQ	lt64gt8			// < 64 bytes
@@ -132,7 +132,7 @@ lt16:	// Move 8 bytes if possible
 	MOVD    TMP, 0(TGT)
 	ADD     $8, TGT
 checkbytes:
-	BC	12, 14, LR		// BEQ lr
+	BEQ	CR3, LR
 #ifdef GOPPC64_power10
 	SLD	$56, BYTES, TMP
 	LXVL	SRC, TMP, V0
@@ -157,7 +157,7 @@ lt4:	// Move halfword if possible
 	ADD $2, TGT
 lt2:	// Move last byte if 1 left
 	CMP BYTES, $1
-	BC 12, 0, LR	// ble lr
+	BLT CR0, LR
 	MOVBZ 0(SRC), TMP
 	MOVBZ TMP, 0(TGT)
 	RET
@@ -182,7 +182,7 @@ backwardtailloop:
 	BDNZ	backwardtailloop
 
 nobackwardtail:
-	BC	4, 5, LR		// blelr cr1, return if DWORDS == 0
+	BLE	CR1, LR                 // return if DWORDS == 0
 	SRDCC	$2,DWORDS,QWORDS	// Compute number of 32B blocks and compare to 0
 	BNE	backward32setup		// If QWORDS != 0, start the 32B copy loop.
 
@@ -190,16 +190,16 @@ backward24:
 	// DWORDS is a value between 1-3.
 	CMP	DWORDS, $2
 
-	MOVD 	-8(SRC), TMP
-	MOVD 	TMP, -8(TGT)
-	BC	12, 0, LR		// bltlr, return if DWORDS == 1
+	MOVD	-8(SRC), TMP
+	MOVD	TMP, -8(TGT)
+	BLT	CR0, LR                 // return if DWORDS == 1
 
-	MOVD 	-16(SRC), TMP
-	MOVD 	TMP, -16(TGT)
-	BC	12, 2, LR		// beqlr, return if DWORDS == 2
+	MOVD	-16(SRC), TMP
+	MOVD	TMP, -16(TGT)
+	BEQ	CR0, LR                 // return if DWORDS == 2
 
-	MOVD 	-24(SRC), TMP
-	MOVD 	TMP, -24(TGT)
+	MOVD	-24(SRC), TMP
+	MOVD	TMP, -24(TGT)
 	RET
 
 backward32setup:
@@ -216,5 +216,5 @@ backward32loop:
 	STXVD2X	VS32, (R0)(TGT)		// store 16x2 bytes
 	STXVD2X	VS33, (IDX16)(TGT)
 	BDNZ	backward32loop
-	BC	12, 2, LR		// beqlr, return if DWORDS == 0
+	BEQ	CR0, LR                 // return if DWORDS == 0
 	BR	backward24
diff --git a/src/runtime/metrics/description_test.go b/src/runtime/metrics/description_test.go
index 4fc65236..0ee9ea16 100644
--- a/src/runtime/metrics/description_test.go
+++ b/src/runtime/metrics/description_test.go
@@ -18,7 +18,7 @@ import (
 	"os"
 	"regexp"
 	"runtime/metrics"
-	"sort"
+	"slices"
 	"strings"
 	"testing"
 	_ "unsafe"
@@ -43,7 +43,7 @@ func TestNames(t *testing.T) {
 	}
 
 	names := runtime_readMetricNames()
-	sort.Strings(names)
+	slices.Sort(names)
 	samples := make([]metrics.Sample, len(names))
 	for i, name := range names {
 		samples[i].Name = name
diff --git a/src/runtime/metrics/doc.go b/src/runtime/metrics/doc.go
index da3d956d..563ddf4c 100644
--- a/src/runtime/metrics/doc.go
+++ b/src/runtime/metrics/doc.go
@@ -250,6 +250,11 @@ Below is the full list of supported metrics, ordered lexicographically.
 		The number of non-default behaviors executed by the cmd/go
 		package due to a non-default GODEBUG=gocacheverify=... setting.
 
+	/godebug/non-default-behavior/gotestjsonbuildtext:events
+		The number of non-default behaviors executed by the cmd/go
+		package due to a non-default GODEBUG=gotestjsonbuildtext=...
+		setting.
+
 	/godebug/non-default-behavior/gotypesalias:events
 		The number of non-default behaviors executed by the go/types
 		package due to a non-default GODEBUG=gotypesalias=... setting.
@@ -306,6 +311,14 @@ Below is the full list of supported metrics, ordered lexicographically.
 		The number of non-default behaviors executed by the math/rand
 		package due to a non-default GODEBUG=randautoseed=... setting.
 
+	/godebug/non-default-behavior/randseednop:events
+		The number of non-default behaviors executed by the math/rand
+		package due to a non-default GODEBUG=randseednop=... setting.
+
+	/godebug/non-default-behavior/rsa1024min:events
+		The number of non-default behaviors executed by the crypto/rsa
+		package due to a non-default GODEBUG=rsa1024min=... setting.
+
 	/godebug/non-default-behavior/tarinsecurepath:events
 		The number of non-default behaviors executed by the archive/tar
 		package due to a non-default GODEBUG=tarinsecurepath=...
@@ -349,9 +362,9 @@ Below is the full list of supported metrics, ordered lexicographically.
 		package due to a non-default GODEBUG=x509negativeserial=...
 		setting.
 
-	/godebug/non-default-behavior/x509sha1:events
+	/godebug/non-default-behavior/x509rsacrt:events
 		The number of non-default behaviors executed by the crypto/x509
-		package due to a non-default GODEBUG=x509sha1=... setting.
+		package due to a non-default GODEBUG=x509rsacrt=... setting.
 
 	/godebug/non-default-behavior/x509usefallbackroots:events
 		The number of non-default behaviors executed by the crypto/x509
diff --git a/src/runtime/metrics_test.go b/src/runtime/metrics_test.go
index ebbf0e4f..9191d86d 100644
--- a/src/runtime/metrics_test.go
+++ b/src/runtime/metrics_test.go
@@ -201,10 +201,10 @@ func TestReadMetrics(t *testing.T) {
 	checkUint64(t, "/gc/heap/frees:objects", frees, mstats.Frees-tinyAllocs)
 
 	// Verify that /gc/pauses:seconds is a copy of /sched/pauses/total/gc:seconds
-	if !reflect.DeepEqual(gcPauses.Buckets, schedPausesTotalGC.Buckets) {
+	if !slices.Equal(gcPauses.Buckets, schedPausesTotalGC.Buckets) {
 		t.Errorf("/gc/pauses:seconds buckets %v do not match /sched/pauses/total/gc:seconds buckets %v", gcPauses.Buckets, schedPausesTotalGC.Counts)
 	}
-	if !reflect.DeepEqual(gcPauses.Counts, schedPausesTotalGC.Counts) {
+	if !slices.Equal(gcPauses.Counts, schedPausesTotalGC.Counts) {
 		t.Errorf("/gc/pauses:seconds counts %v do not match /sched/pauses/total/gc:seconds counts %v", gcPauses.Counts, schedPausesTotalGC.Counts)
 	}
 }
diff --git a/src/runtime/mfinal.go b/src/runtime/mfinal.go
index 78313fb7..4962a63a 100644
--- a/src/runtime/mfinal.go
+++ b/src/runtime/mfinal.go
@@ -10,7 +10,7 @@ import (
 	"internal/abi"
 	"internal/goarch"
 	"internal/runtime/atomic"
-	"runtime/internal/sys"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
@@ -40,11 +40,14 @@ const (
 	fingWake
 )
 
-var finlock mutex  // protects the following variables
-var fing *g        // goroutine that runs finalizers
-var finq *finblock // list of finalizers that are to be executed
-var finc *finblock // cache of free blocks
-var finptrmask [_FinBlockSize / goarch.PtrSize / 8]byte
+// This runs durring the GC sweep phase. Heap memory can't be allocated while sweep is running.
+var (
+	finlock    mutex     // protects the following variables
+	fing       *g        // goroutine that runs finalizers
+	finq       *finblock // list of finalizers that are to be executed
+	finc       *finblock // cache of free blocks
+	finptrmask [_FinBlockSize / goarch.PtrSize / 8]byte
+)
 
 var allfin *finblock // list of all blocks
 
@@ -172,7 +175,7 @@ func finalizercommit(gp *g, lock unsafe.Pointer) bool {
 	return true
 }
 
-// This is the goroutine that runs all of the finalizers.
+// This is the goroutine that runs all of the finalizers and cleanups.
 func runfinq() {
 	var (
 		frame    unsafe.Pointer
@@ -202,6 +205,22 @@ func runfinq() {
 			for i := fb.cnt; i > 0; i-- {
 				f := &fb.fin[i-1]
 
+				// arg will only be nil when a cleanup has been queued.
+				if f.arg == nil {
+					var cleanup func()
+					fn := unsafe.Pointer(f.fn)
+					cleanup = *(*func())(unsafe.Pointer(&fn))
+					fingStatus.Or(fingRunningFinalizer)
+					cleanup()
+					fingStatus.And(^fingRunningFinalizer)
+
+					f.fn = nil
+					f.arg = nil
+					f.ot = nil
+					atomic.Store(&fb.cnt, i-1)
+					continue
+				}
+
 				var regs abi.RegArgs
 				// The args may be passed in registers or on stack. Even for
 				// the register case, we still need the spill slots.
@@ -220,7 +239,8 @@ func runfinq() {
 					frame = mallocgc(framesz, nil, true)
 					framecap = framesz
 				}
-
+				// cleanups also have a nil fint. Cleanups should have been processed before
+				// reaching this point.
 				if f.fint == nil {
 					throw("missing type in runfinq")
 				}
@@ -330,6 +350,9 @@ func blockUntilEmptyFinalizerQueue(timeout int64) bool {
 //
 // SetFinalizer(obj, nil) clears any finalizer associated with obj.
 //
+// New Go code should consider using [AddCleanup] instead, which is much
+// less error-prone than SetFinalizer.
+//
 // The argument obj must be a pointer to an object allocated by calling
 // new, by taking the address of a composite literal, or by taking the
 // address of a local variable.
@@ -409,11 +432,6 @@ func blockUntilEmptyFinalizerQueue(timeout int64) bool {
 // need to use appropriate synchronization, such as mutexes or atomic updates,
 // to avoid read-write races.
 func SetFinalizer(obj any, finalizer any) {
-	if debug.sbrk != 0 {
-		// debug.sbrk never frees memory, so no finalizers run
-		// (and we don't have the data structures to record them).
-		return
-	}
 	e := efaceOf(&obj)
 	etyp := e._type
 	if etyp == nil {
@@ -426,11 +444,15 @@ func SetFinalizer(obj any, finalizer any) {
 	if ot.Elem == nil {
 		throw("nil elem type!")
 	}
-
 	if inUserArenaChunk(uintptr(e.data)) {
 		// Arena-allocated objects are not eligible for finalizers.
 		throw("runtime.SetFinalizer: first argument was allocated into an arena")
 	}
+	if debug.sbrk != 0 {
+		// debug.sbrk never frees memory, so no finalizers run
+		// (and we don't have the data structures to record them).
+		return
+	}
 
 	// find the containing object
 	base, span, _ := findObject(uintptr(e.data), 0, 0)
diff --git a/src/runtime/mfinal_test.go b/src/runtime/mfinal_test.go
index 87d31c47..5c93c74c 100644
--- a/src/runtime/mfinal_test.go
+++ b/src/runtime/mfinal_test.go
@@ -5,6 +5,7 @@
 package runtime_test
 
 import (
+	"internal/asan"
 	"runtime"
 	"testing"
 	"time"
@@ -165,6 +166,9 @@ func adjChunks() (*objtype, *objtype) {
 
 // Make sure an empty slice on the stack doesn't pin the next object in memory.
 func TestEmptySlice(t *testing.T) {
+	if asan.Enabled {
+		t.Skip("skipping with -asan: test assumes exact size class alignment, but asan redzone breaks that assumption")
+	}
 	x, y := adjChunks()
 
 	// the pointer inside xs points to y.
@@ -194,6 +198,9 @@ func adjStringChunk() (string, *objtype) {
 
 // Make sure an empty string on the stack doesn't pin the next object in memory.
 func TestEmptyString(t *testing.T) {
+	if asan.Enabled {
+		t.Skip("skipping with -asan: test assumes exact size class alignment, but asan redzone breaks that assumption")
+	}
 	x, y := adjStringChunk()
 
 	ss := x[objsize:] // change objsize to objsize-1 and the test passes
diff --git a/src/runtime/mfixalloc.go b/src/runtime/mfixalloc.go
index 7760ada3..be977af7 100644
--- a/src/runtime/mfixalloc.go
+++ b/src/runtime/mfixalloc.go
@@ -9,7 +9,7 @@
 package runtime
 
 import (
-	"runtime/internal/sys"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
@@ -27,7 +27,7 @@ import (
 // smashed by freeing and reallocating.
 //
 // Consider marking fixalloc'd types not in heap by embedding
-// runtime/internal/sys.NotInHeap.
+// internal/runtime/sys.NotInHeap.
 type fixalloc struct {
 	size   uintptr
 	first  func(arg, p unsafe.Pointer) // called first time p is returned
diff --git a/src/runtime/mgc.go b/src/runtime/mgc.go
index f72edc2a..48001cfd 100644
--- a/src/runtime/mgc.go
+++ b/src/runtime/mgc.go
@@ -221,7 +221,6 @@ var gcphase uint32
 // but widely used packages access it using linkname.
 // Notable members of the hall of shame include:
 //   - github.com/bytedance/sonic
-//   - github.com/cloudwego/frugal
 //
 // Do not remove or change the type signature.
 // See go.dev/issue/67401.
@@ -336,11 +335,12 @@ type workType struct {
 
 	// bytesMarked is the number of bytes marked this cycle. This
 	// includes bytes blackened in scanned objects, noscan objects
-	// that go straight to black, and permagrey objects scanned by
-	// markroot during the concurrent scan phase. This is updated
-	// atomically during the cycle. Updates may be batched
-	// arbitrarily, since the value is only read at the end of the
-	// cycle.
+	// that go straight to black, objects allocated as black during
+	// the cycle, and permagrey objects scanned by markroot during
+	// the concurrent scan phase.
+	//
+	// This is updated atomically during the cycle. Updates may be batched
+	// arbitrarily, since the value is only read at the end of the cycle.
 	//
 	// Because of benign races during marking, this number may not
 	// be the exact number of marked bytes, but it should be very
@@ -639,6 +639,17 @@ func gcStart(trigger gcTrigger) {
 	releasem(mp)
 	mp = nil
 
+	if gp := getg(); gp.syncGroup != nil {
+		// Disassociate the G from its synctest bubble while allocating.
+		// This is less elegant than incrementing the group's active count,
+		// but avoids any contamination between GC and synctest.
+		sg := gp.syncGroup
+		gp.syncGroup = nil
+		defer func() {
+			gp.syncGroup = sg
+		}()
+	}
+
 	// Pick up the remaining unswept/not being swept spans concurrently
 	//
 	// This shouldn't happen if we're being invoked in background
@@ -1774,8 +1785,12 @@ func boring_registerCache(p unsafe.Pointer) {
 
 //go:linkname unique_runtime_registerUniqueMapCleanup unique.runtime_registerUniqueMapCleanup
 func unique_runtime_registerUniqueMapCleanup(f func()) {
+	// Create the channel on the system stack so it doesn't inherit the current G's
+	// synctest bubble (if any).
+	systemstack(func() {
+		uniqueMapCleanup = make(chan struct{}, 1)
+	})
 	// Start the goroutine in the runtime so it's counted as a system goroutine.
-	uniqueMapCleanup = make(chan struct{}, 1)
 	go func(cleanup func()) {
 		for {
 			<-uniqueMapCleanup
@@ -1908,7 +1923,7 @@ func gcTestIsReachable(ptrs ...unsafe.Pointer) (mask uint64) {
 		s := (*specialReachable)(mheap_.specialReachableAlloc.alloc())
 		unlock(&mheap_.speciallock)
 		s.special.kind = _KindSpecialReachable
-		if !addspecial(p, &s.special) {
+		if !addspecial(p, &s.special, false) {
 			throw("already have a reachable special (duplicate pointer?)")
 		}
 		specials[i] = s
diff --git a/src/runtime/mgcmark.go b/src/runtime/mgcmark.go
index 61e917df..823b2bd7 100644
--- a/src/runtime/mgcmark.go
+++ b/src/runtime/mgcmark.go
@@ -10,7 +10,7 @@ import (
 	"internal/abi"
 	"internal/goarch"
 	"internal/runtime/atomic"
-	"runtime/internal/sys"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
@@ -178,6 +178,8 @@ func markroot(gcw *gcWork, i uint32, flushBgCredit bool) int64 {
 	case i == fixedRootFinalizers:
 		for fb := allfin; fb != nil; fb = fb.alllink {
 			cnt := uintptr(atomic.Load(&fb.cnt))
+			// Finalizers that contain cleanups only have fn set. None of the other
+			// fields are necessary.
 			scanblock(uintptr(unsafe.Pointer(&fb.fin[0])), cnt*unsafe.Sizeof(fb.fin[0]), &finptrmask[0], gcw, nil)
 		}
 
@@ -401,6 +403,10 @@ func markrootSpans(gcw *gcWork, shard int) {
 					// The special itself is a root.
 					spw := (*specialWeakHandle)(unsafe.Pointer(sp))
 					scanblock(uintptr(unsafe.Pointer(&spw.handle)), goarch.PtrSize, &oneptrmask[0], gcw, nil)
+				case _KindSpecialCleanup:
+					spc := (*specialCleanup)(unsafe.Pointer(sp))
+					// The special itself is a root.
+					scanblock(uintptr(unsafe.Pointer(&spc.fn)), goarch.PtrSize, &oneptrmask[0], gcw, nil)
 				}
 			}
 			unlock(&s.speciallock)
@@ -422,6 +428,17 @@ func gcAssistAlloc(gp *g) {
 		return
 	}
 
+	if gp := getg(); gp.syncGroup != nil {
+		// Disassociate the G from its synctest bubble while allocating.
+		// This is less elegant than incrementing the group's active count,
+		// but avoids any contamination between GC assist and synctest.
+		sg := gp.syncGroup
+		gp.syncGroup = nil
+		defer func() {
+			gp.syncGroup = sg
+		}()
+	}
+
 	// This extremely verbose boolean indicates whether we've
 	// entered mark assist from the perspective of the tracer.
 	//
@@ -945,31 +962,12 @@ func scanstack(gp *g, gcw *gcWork) int64 {
 			println()
 			printunlock()
 		}
-		gcdata := r.gcdata()
-		var s *mspan
-		if r.useGCProg() {
-			// This path is pretty unlikely, an object large enough
-			// to have a GC program allocated on the stack.
-			// We need some space to unpack the program into a straight
-			// bitmask, which we allocate/free here.
-			// TODO: it would be nice if there were a way to run a GC
-			// program without having to store all its bits. We'd have
-			// to change from a Lempel-Ziv style program to something else.
-			// Or we can forbid putting objects on stacks if they require
-			// a gc program (see issue 27447).
-			s = materializeGCProg(r.ptrdata(), gcdata)
-			gcdata = (*byte)(unsafe.Pointer(s.startAddr))
-		}
-
+		ptrBytes, gcData := r.gcdata()
 		b := state.stack.lo + uintptr(obj.off)
 		if conservative {
-			scanConservative(b, r.ptrdata(), gcdata, gcw, &state)
+			scanConservative(b, ptrBytes, gcData, gcw, &state)
 		} else {
-			scanblock(b, r.ptrdata(), gcdata, gcw, &state)
-		}
-
-		if s != nil {
-			dematerializeGCProg(s)
+			scanblock(b, ptrBytes, gcData, gcw, &state)
 		}
 	}
 
@@ -1694,6 +1692,10 @@ func gcmarknewobject(span *mspan, obj uintptr) {
 	if useCheckmark { // The world should be stopped so this should not happen.
 		throw("gcmarknewobject called while doing checkmark")
 	}
+	if gcphase == _GCmarktermination {
+		// Check this here instead of on the hot path.
+		throw("mallocgc called with gcphase == _GCmarktermination")
+	}
 
 	// Mark object.
 	objIndex := span.objIndex(obj)
diff --git a/src/runtime/mgcpacer.go b/src/runtime/mgcpacer.go
index cda87fe9..3e80fae4 100644
--- a/src/runtime/mgcpacer.go
+++ b/src/runtime/mgcpacer.go
@@ -752,6 +752,17 @@ func (c *gcControllerState) findRunnableGCWorker(pp *p, now int64) (*g, int64) {
 		return nil, now
 	}
 
+	if c.dedicatedMarkWorkersNeeded.Load() <= 0 && c.fractionalUtilizationGoal == 0 {
+		// No current need for dedicated workers, and no need at all for
+		// fractional workers. Check before trying to acquire a worker; when
+		// GOMAXPROCS is large, that can be expensive and is often unnecessary.
+		//
+		// When a dedicated worker stops running, the gcBgMarkWorker loop notes
+		// the need for the worker before returning it to the pool. If we don't
+		// see the need now, we wouldn't have found it in the pool anyway.
+		return nil, now
+	}
+
 	// Grab a worker before we commit to running below.
 	node := (*gcBgMarkWorkerNode)(gcBgMarkWorkerPool.pop())
 	if node == nil {
diff --git a/src/runtime/mgcscavenge.go b/src/runtime/mgcscavenge.go
index 4f0bd9c2..3d869ecd 100644
--- a/src/runtime/mgcscavenge.go
+++ b/src/runtime/mgcscavenge.go
@@ -93,7 +93,7 @@ package runtime
 import (
 	"internal/goos"
 	"internal/runtime/atomic"
-	"runtime/internal/sys"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
diff --git a/src/runtime/mgcstack.go b/src/runtime/mgcstack.go
index f4a83f5f..bc5911f1 100644
--- a/src/runtime/mgcstack.go
+++ b/src/runtime/mgcstack.go
@@ -96,7 +96,7 @@ package runtime
 
 import (
 	"internal/goarch"
-	"runtime/internal/sys"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
diff --git a/src/runtime/mgcsweep.go b/src/runtime/mgcsweep.go
index f53330a5..b6890bac 100644
--- a/src/runtime/mgcsweep.go
+++ b/src/runtime/mgcsweep.go
@@ -25,7 +25,6 @@
 package runtime
 
 import (
-	"internal/abi"
 	"internal/runtime/atomic"
 	"unsafe"
 )
@@ -565,7 +564,7 @@ func (sl *sweepLocked) sweep(preserve bool) bool {
 			}
 			if hasFinAndRevived {
 				// Pass 2: queue all finalizers and clear any weak handles. Weak handles are cleared
-				// before finalization as specified by the internal/weak package. See the documentation
+				// before finalization as specified by the weak package. See the documentation
 				// for that package for more details.
 				for siter.valid() && uintptr(siter.s.offset) < endOffset {
 					// Find the exact byte for which the special was setup
@@ -818,18 +817,6 @@ func (sl *sweepLocked) sweep(preserve bool) bool {
 			} else {
 				mheap_.freeSpan(s)
 			}
-			if s.largeType != nil && s.largeType.TFlag&abi.TFlagUnrolledBitmap != 0 {
-				// The unrolled GCProg bitmap is allocated separately.
-				// Free the space for the unrolled bitmap.
-				systemstack(func() {
-					s := spanOf(uintptr(unsafe.Pointer(s.largeType)))
-					mheap_.freeManual(s, spanAllocPtrScalarBits)
-				})
-				// Make sure to zero this pointer without putting the old
-				// value in a write buffer, as the old value might be an
-				// invalid pointer. See arena.go:(*mheap).allocUserArenaChunk.
-				*(*uintptr)(unsafe.Pointer(&s.largeType)) = 0
-			}
 			return true
 		}
 
@@ -855,7 +842,7 @@ func (sl *sweepLocked) sweep(preserve bool) bool {
 // pointer to that object and marked it.
 func (s *mspan) reportZombies() {
 	printlock()
-	print("runtime: marked free object in span ", s, ", elemsize=", s.elemsize, " freeindex=", s.freeindex, " (bad use of unsafe.Pointer? try -d=checkptr)\n")
+	print("runtime: marked free object in span ", s, ", elemsize=", s.elemsize, " freeindex=", s.freeindex, " (bad use of unsafe.Pointer or having race conditions? try -d=checkptr or -race)\n")
 	mbits := s.markBitsForBase()
 	abits := s.allocBitsForIndex(0)
 	for i := uintptr(0); i < uintptr(s.nelems); i++ {
diff --git a/src/runtime/mgcwork.go b/src/runtime/mgcwork.go
index b91a6bd4..2d66fa40 100644
--- a/src/runtime/mgcwork.go
+++ b/src/runtime/mgcwork.go
@@ -7,7 +7,7 @@ package runtime
 import (
 	"internal/goarch"
 	"internal/runtime/atomic"
-	"runtime/internal/sys"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
diff --git a/src/runtime/mheap.go b/src/runtime/mheap.go
index bfca2d10..e058dd84 100644
--- a/src/runtime/mheap.go
+++ b/src/runtime/mheap.go
@@ -12,7 +12,7 @@ import (
 	"internal/cpu"
 	"internal/goarch"
 	"internal/runtime/atomic"
-	"runtime/internal/sys"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
@@ -204,6 +204,7 @@ type mheap struct {
 	spanalloc              fixalloc // allocator for span*
 	cachealloc             fixalloc // allocator for mcache*
 	specialfinalizeralloc  fixalloc // allocator for specialfinalizer*
+	specialCleanupAlloc    fixalloc // allocator for specialcleanup*
 	specialprofilealloc    fixalloc // allocator for specialprofile*
 	specialReachableAlloc  fixalloc // allocator for specialReachable
 	specialPinCounterAlloc fixalloc // allocator for specialPinCounter
@@ -230,6 +231,12 @@ type mheap struct {
 		readyList mSpanList
 	}
 
+	// cleanupID is a counter which is incremented each time a cleanup special is added
+	// to a span. It's used to create globally unique identifiers for individual cleanup.
+	// cleanupID is protected by mheap_.lock. It should only be incremented while holding
+	// the lock.
+	cleanupID uint64
+
 	unused *specialfinalizer // never set, just here to force the specialfinalizer type into DWARF
 }
 
@@ -743,6 +750,7 @@ func (h *mheap) init() {
 	h.spanalloc.init(unsafe.Sizeof(mspan{}), recordspan, unsafe.Pointer(h), &memstats.mspan_sys)
 	h.cachealloc.init(unsafe.Sizeof(mcache{}), nil, nil, &memstats.mcache_sys)
 	h.specialfinalizeralloc.init(unsafe.Sizeof(specialfinalizer{}), nil, nil, &memstats.other_sys)
+	h.specialCleanupAlloc.init(unsafe.Sizeof(specialCleanup{}), nil, nil, &memstats.other_sys)
 	h.specialprofilealloc.init(unsafe.Sizeof(specialprofile{}), nil, nil, &memstats.other_sys)
 	h.specialReachableAlloc.init(unsafe.Sizeof(specialReachable{}), nil, nil, &memstats.other_sys)
 	h.specialPinCounterAlloc.init(unsafe.Sizeof(specialPinCounter{}), nil, nil, &memstats.other_sys)
@@ -1368,7 +1376,7 @@ HaveSpan:
 
 	// Trace the span alloc.
 	if traceAllocFreeEnabled() {
-		trace := traceTryAcquire()
+		trace := traceAcquire()
 		if trace.ok() {
 			trace.SpanAlloc(s)
 			traceRelease(trace)
@@ -1556,7 +1564,7 @@ func (h *mheap) freeSpan(s *mspan) {
 	systemstack(func() {
 		// Trace the span free.
 		if traceAllocFreeEnabled() {
-			trace := traceTryAcquire()
+			trace := traceAcquire()
 			if trace.ok() {
 				trace.SpanFree(s)
 				traceRelease(trace)
@@ -1595,7 +1603,7 @@ func (h *mheap) freeSpan(s *mspan) {
 func (h *mheap) freeManual(s *mspan, typ spanAllocType) {
 	// Trace the span free.
 	if traceAllocFreeEnabled() {
-		trace := traceTryAcquire()
+		trace := traceAcquire()
 		if trace.ok() {
 			trace.SpanFree(s)
 			traceRelease(trace)
@@ -1824,12 +1832,14 @@ const (
 	// _KindSpecialPinCounter is a special used for objects that are pinned
 	// multiple times
 	_KindSpecialPinCounter = 5
+	// _KindSpecialCleanup is for tracking cleanups.
+	_KindSpecialCleanup = 6
 )
 
 type special struct {
 	_      sys.NotInHeap
 	next   *special // linked list in span
-	offset uint16   // span offset of object
+	offset uintptr  // span offset of object
 	kind   byte     // kind of special
 }
 
@@ -1849,13 +1859,13 @@ func spanHasNoSpecials(s *mspan) {
 	atomic.And8(&ha.pageSpecials[arenaPage/8], ^(uint8(1) << (arenaPage % 8)))
 }
 
-// Adds the special record s to the list of special records for
+// addspecial adds the special record s to the list of special records for
 // the object p. All fields of s should be filled in except for
 // offset & next, which this routine will fill in.
 // Returns true if the special was successfully added, false otherwise.
 // (The add will fail only if a record with the same p and s->kind
-// already exists.)
-func addspecial(p unsafe.Pointer, s *special) bool {
+// already exists unless force is set to true.)
+func addspecial(p unsafe.Pointer, s *special, force bool) bool {
 	span := spanOfHeap(uintptr(p))
 	if span == nil {
 		throw("addspecial on invalid pointer")
@@ -1874,9 +1884,9 @@ func addspecial(p unsafe.Pointer, s *special) bool {
 
 	// Find splice point, check for existing record.
 	iter, exists := span.specialFindSplicePoint(offset, kind)
-	if !exists {
+	if !exists || force {
 		// Splice in record, fill in offset.
-		s.offset = uint16(offset)
+		s.offset = offset
 		s.next = *iter
 		*iter = s
 		spanHasSpecials(span)
@@ -1884,7 +1894,10 @@ func addspecial(p unsafe.Pointer, s *special) bool {
 
 	unlock(&span.speciallock)
 	releasem(mp)
-	return !exists // already exists
+	// We're converting p to a uintptr and looking it up, and we
+	// don't want it to die and get swept while we're doing so.
+	KeepAlive(p)
+	return !exists || force // already exists or addition was forced
 }
 
 // Removes the Special record of the given kind for the object p.
@@ -1968,7 +1981,7 @@ func addfinalizer(p unsafe.Pointer, f *funcval, nret uintptr, fint *_type, ot *p
 	s.nret = nret
 	s.fint = fint
 	s.ot = ot
-	if addspecial(p, &s.special) {
+	if addspecial(p, &s.special, false) {
 		// This is responsible for maintaining the same
 		// GC-related invariants as markrootSpans in any
 		// situation where it's possible that markrootSpans
@@ -2008,6 +2021,50 @@ func removefinalizer(p unsafe.Pointer) {
 	unlock(&mheap_.speciallock)
 }
 
+// The described object has a cleanup set for it.
+type specialCleanup struct {
+	_       sys.NotInHeap
+	special special
+	fn      *funcval
+	// Globally unique ID for the cleanup, obtained from mheap_.cleanupID.
+	id uint64
+}
+
+// addCleanup attaches a cleanup function to the object. Multiple
+// cleanups are allowed on an object, and even the same pointer.
+// A cleanup id is returned which can be used to uniquely identify
+// the cleanup.
+func addCleanup(p unsafe.Pointer, f *funcval) uint64 {
+	lock(&mheap_.speciallock)
+	s := (*specialCleanup)(mheap_.specialCleanupAlloc.alloc())
+	mheap_.cleanupID++
+	id := mheap_.cleanupID
+	unlock(&mheap_.speciallock)
+	s.special.kind = _KindSpecialCleanup
+	s.fn = f
+	s.id = id
+
+	mp := acquirem()
+	addspecial(p, &s.special, true)
+	// This is responsible for maintaining the same
+	// GC-related invariants as markrootSpans in any
+	// situation where it's possible that markrootSpans
+	// has already run but mark termination hasn't yet.
+	if gcphase != _GCoff {
+		gcw := &mp.p.ptr().gcw
+		// Mark the cleanup itself, since the
+		// special isn't part of the GC'd heap.
+		scanblock(uintptr(unsafe.Pointer(&s.fn)), goarch.PtrSize, &oneptrmask[0], gcw, nil)
+	}
+	releasem(mp)
+	// Keep f alive. There's a window in this function where it's
+	// only reachable via the special while the special hasn't been
+	// added to the specials list yet. This is similar to a bug
+	// discovered for weak handles, see #70455.
+	KeepAlive(f)
+	return id
+}
+
 // The described object has a weak pointer.
 //
 // Weak pointers in the GC have the following invariants:
@@ -2040,12 +2097,12 @@ type specialWeakHandle struct {
 	handle *atomic.Uintptr
 }
 
-//go:linkname internal_weak_runtime_registerWeakPointer internal/weak.runtime_registerWeakPointer
+//go:linkname internal_weak_runtime_registerWeakPointer weak.runtime_registerWeakPointer
 func internal_weak_runtime_registerWeakPointer(p unsafe.Pointer) unsafe.Pointer {
 	return unsafe.Pointer(getOrAddWeakHandle(unsafe.Pointer(p)))
 }
 
-//go:linkname internal_weak_runtime_makeStrongFromWeak internal/weak.runtime_makeStrongFromWeak
+//go:linkname internal_weak_runtime_makeStrongFromWeak weak.runtime_makeStrongFromWeak
 func internal_weak_runtime_makeStrongFromWeak(u unsafe.Pointer) unsafe.Pointer {
 	handle := (*atomic.Uintptr)(u)
 
@@ -2156,7 +2213,7 @@ func getOrAddWeakHandle(p unsafe.Pointer) *atomic.Uintptr {
 	s.special.kind = _KindSpecialWeakHandle
 	s.handle = handle
 	handle.Store(uintptr(p))
-	if addspecial(p, &s.special) {
+	if addspecial(p, &s.special, false) {
 		// This is responsible for maintaining the same
 		// GC-related invariants as markrootSpans in any
 		// situation where it's possible that markrootSpans
@@ -2251,7 +2308,7 @@ func setprofilebucket(p unsafe.Pointer, b *bucket) {
 	unlock(&mheap_.speciallock)
 	s.special.kind = _KindSpecialProfile
 	s.b = b
-	if !addspecial(p, &s.special) {
+	if !addspecial(p, &s.special, false) {
 		throw("setprofilebucket: profile already set")
 	}
 }
@@ -2328,6 +2385,15 @@ func freeSpecial(s *special, p unsafe.Pointer, size uintptr) {
 		lock(&mheap_.speciallock)
 		mheap_.specialPinCounterAlloc.free(unsafe.Pointer(s))
 		unlock(&mheap_.speciallock)
+	case _KindSpecialCleanup:
+		sc := (*specialCleanup)(unsafe.Pointer(s))
+		// Cleanups, unlike finalizers, do not resurrect the objects
+		// they're attached to, so we only need to pass the cleanup
+		// function, not the object.
+		queuefinalizer(nil, sc.fn, 0, nil, nil)
+		lock(&mheap_.speciallock)
+		mheap_.specialCleanupAlloc.free(unsafe.Pointer(sc))
+		unlock(&mheap_.speciallock)
 	default:
 		throw("bad special kind")
 		panic("not reached")
diff --git a/src/runtime/mklockrank.go b/src/runtime/mklockrank.go
index 3391afc6..e4a749dd 100644
--- a/src/runtime/mklockrank.go
+++ b/src/runtime/mklockrank.go
@@ -95,6 +95,9 @@ NONE
 < itab
 < reflectOffs;
 
+# Synctest
+hchan, root, timers, timer, notifyList, reflectOffs < synctest;
+
 # User arena state
 NONE < userArenaState;
 
@@ -145,6 +148,7 @@ gcBitsArenas,
   profInsert,
   profMemFuture,
   spanSetSpine,
+  synctest,
   fin,
   root
 # Anything that can grow the stack can acquire STACKGROW.
diff --git a/src/runtime/mkpreempt.go b/src/runtime/mkpreempt.go
index 17544d6b..08500a90 100644
--- a/src/runtime/mkpreempt.go
+++ b/src/runtime/mkpreempt.go
@@ -264,19 +264,6 @@ func genAMD64() {
 
 	l.save()
 
-	// Apparently, the signal handling code path in darwin kernel leaves
-	// the upper bits of Y registers in a dirty state, which causes
-	// many SSE operations (128-bit and narrower) become much slower.
-	// Clear the upper bits to get to a clean state. See issue #37174.
-	// It is safe here as Go code don't use the upper bits of Y registers.
-	p("#ifdef GOOS_darwin")
-	p("#ifndef hasAVX")
-	p("CMPB internal∕cpu·X86+const_offsetX86HasAVX(SB), $0")
-	p("JE 2(PC)")
-	p("#endif")
-	p("VZEROUPPER")
-	p("#endif")
-
 	lSSE.save()
 	p("CALL ·asyncPreempt2(SB)")
 	lSSE.restore()
diff --git a/src/runtime/mpagecache.go b/src/runtime/mpagecache.go
index 245b0cbf..0ed3e80c 100644
--- a/src/runtime/mpagecache.go
+++ b/src/runtime/mpagecache.go
@@ -5,7 +5,7 @@
 package runtime
 
 import (
-	"runtime/internal/sys"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
diff --git a/src/runtime/mpallocbits.go b/src/runtime/mpallocbits.go
index d8a9d257..e8e70f36 100644
--- a/src/runtime/mpallocbits.go
+++ b/src/runtime/mpallocbits.go
@@ -5,7 +5,7 @@
 package runtime
 
 import (
-	"runtime/internal/sys"
+	"internal/runtime/sys"
 )
 
 // pageBits is a bitmap representing one bit per page in a palloc chunk.
diff --git a/src/runtime/mprof.go b/src/runtime/mprof.go
index ee3e59a9..3cf8dc81 100644
--- a/src/runtime/mprof.go
+++ b/src/runtime/mprof.go
@@ -12,7 +12,7 @@ import (
 	"internal/goarch"
 	"internal/profilerecord"
 	"internal/runtime/atomic"
-	"runtime/internal/sys"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
@@ -49,7 +49,7 @@ const (
 	// desired maximum number of frames after expansion.
 	// This should be at least as large as the largest skip value
 	// used for profiling; otherwise stacks may be truncated inconsistently
-	maxSkip = 5
+	maxSkip = 6
 
 	// maxProfStackDepth is the highest valid value for debug.profstackdepth.
 	// It's used for the bucket.stk func.
@@ -242,7 +242,7 @@ func newBucket(typ bucketType, nstk int) *bucket {
 	return b
 }
 
-// stk returns the slice in b holding the stack. The caller can asssume that the
+// stk returns the slice in b holding the stack. The caller can assume that the
 // backing array is immutable.
 func (b *bucket) stk() []uintptr {
 	stk := (*[maxProfStackDepth]uintptr)(add(unsafe.Pointer(b), unsafe.Sizeof(*b)))
@@ -444,7 +444,7 @@ func mProf_Malloc(mp *m, p unsafe.Pointer, size uintptr) {
 	}
 	// Only use the part of mp.profStack we need and ignore the extra space
 	// reserved for delayed inline expansion with frame pointer unwinding.
-	nstk := callers(4, mp.profStack[:debug.profstackdepth])
+	nstk := callers(5, mp.profStack[:debug.profstackdepth])
 	index := (mProfCycle.read() + 2) % uint32(len(memRecord{}.future))
 
 	b := stkbucket(memProfile, size, mp.profStack[:nstk], true)
@@ -718,12 +718,13 @@ type mLockProfile struct {
 	pending    uintptr      // *mutex that experienced contention (to be traceback-ed)
 	cycles     int64        // cycles attributable to "pending" (if set), otherwise to "stack"
 	cyclesLost int64        // contention for which we weren't able to record a call stack
+	haveStack  bool         // stack and cycles are to be added to the mutex profile
 	disabled   bool         // attribute all time to "lost"
 }
 
 func (prof *mLockProfile) recordLock(cycles int64, l *mutex) {
-	if cycles <= 0 {
-		return
+	if cycles < 0 {
+		cycles = 0
 	}
 
 	if prof.disabled {
@@ -745,6 +746,9 @@ func (prof *mLockProfile) recordLock(cycles int64, l *mutex) {
 		// We can only store one call stack for runtime-internal lock contention
 		// on this M, and we've already got one. Decide which should stay, and
 		// add the other to the report for runtime._LostContendedRuntimeLock.
+		if cycles == 0 {
+			return
+		}
 		prevScore := uint64(cheaprand64()) % uint64(prev)
 		thisScore := uint64(cheaprand64()) % uint64(cycles)
 		if prevScore > thisScore {
@@ -769,7 +773,7 @@ func (prof *mLockProfile) recordUnlock(l *mutex) {
 	if uintptr(unsafe.Pointer(l)) == prof.pending {
 		prof.captureStack()
 	}
-	if gp := getg(); gp.m.locks == 1 && gp.m.mLockProfile.cycles != 0 {
+	if gp := getg(); gp.m.locks == 1 && gp.m.mLockProfile.haveStack {
 		prof.store()
 	}
 }
@@ -795,6 +799,7 @@ func (prof *mLockProfile) captureStack() {
 		skip += 1 // runtime.unlockWithRank.func1
 	}
 	prof.pending = 0
+	prof.haveStack = true
 
 	prof.stack[0] = logicalStackSentinel
 	if debug.runtimeContentionStacks.Load() == 0 {
@@ -805,8 +810,8 @@ func (prof *mLockProfile) captureStack() {
 
 	var nstk int
 	gp := getg()
-	sp := getcallersp()
-	pc := getcallerpc()
+	sp := sys.GetCallerSP()
+	pc := sys.GetCallerPC()
 	systemstack(func() {
 		var u unwinder
 		u.initAt(pc, sp, 0, gp, unwindSilentErrors|unwindJumpStack)
@@ -835,6 +840,7 @@ func (prof *mLockProfile) store() {
 
 	cycles, lost := prof.cycles, prof.cyclesLost
 	prof.cycles, prof.cyclesLost = 0, 0
+	prof.haveStack = false
 
 	rate := int64(atomic.Load64(&mutexprofilerate))
 	saveBlockEventStack(cycles, rate, prof.stack[:nstk], mutexProfile)
@@ -1074,7 +1080,7 @@ func copyMemProfileRecord(dst *MemProfileRecord, src profilerecord.MemProfileRec
 	dst.AllocObjects = src.AllocObjects
 	dst.FreeObjects = src.FreeObjects
 	if raceenabled {
-		racewriterangepc(unsafe.Pointer(&dst.Stack0[0]), unsafe.Sizeof(dst.Stack0), getcallerpc(), abi.FuncPCABIInternal(MemProfile))
+		racewriterangepc(unsafe.Pointer(&dst.Stack0[0]), unsafe.Sizeof(dst.Stack0), sys.GetCallerPC(), abi.FuncPCABIInternal(MemProfile))
 	}
 	if msanenabled {
 		msanwrite(unsafe.Pointer(&dst.Stack0[0]), unsafe.Sizeof(dst.Stack0))
@@ -1188,7 +1194,7 @@ func copyBlockProfileRecord(dst *BlockProfileRecord, src profilerecord.BlockProf
 	dst.Count = src.Count
 	dst.Cycles = src.Cycles
 	if raceenabled {
-		racewriterangepc(unsafe.Pointer(&dst.Stack0[0]), unsafe.Sizeof(dst.Stack0), getcallerpc(), abi.FuncPCABIInternal(BlockProfile))
+		racewriterangepc(unsafe.Pointer(&dst.Stack0[0]), unsafe.Sizeof(dst.Stack0), sys.GetCallerPC(), abi.FuncPCABIInternal(BlockProfile))
 	}
 	if msanenabled {
 		msanwrite(unsafe.Pointer(&dst.Stack0[0]), unsafe.Sizeof(dst.Stack0))
@@ -1397,8 +1403,8 @@ func goroutineProfileWithLabelsConcurrent(p []profilerecord.StackRecord, labels
 	}
 
 	// Save current goroutine.
-	sp := getcallersp()
-	pc := getcallerpc()
+	sp := sys.GetCallerSP()
+	pc := sys.GetCallerPC()
 	systemstack(func() {
 		saveg(pc, sp, ourg, &p[0], pcbuf)
 	})
@@ -1593,8 +1599,8 @@ func goroutineProfileWithLabelsSync(p []profilerecord.StackRecord, labels []unsa
 		r, lbl := p, labels
 
 		// Save current goroutine.
-		sp := getcallersp()
-		pc := getcallerpc()
+		sp := sys.GetCallerSP()
+		pc := sys.GetCallerPC()
 		systemstack(func() {
 			saveg(pc, sp, gp, &r[0], pcbuf)
 		})
@@ -1696,8 +1702,8 @@ func Stack(buf []byte, all bool) int {
 	n := 0
 	if len(buf) > 0 {
 		gp := getg()
-		sp := getcallersp()
-		pc := getcallerpc()
+		sp := sys.GetCallerSP()
+		pc := sys.GetCallerPC()
 		systemstack(func() {
 			g0 := getg()
 			// Force traceback=1 to override GOTRACEBACK setting,
diff --git a/src/runtime/netpoll.go b/src/runtime/netpoll.go
index 7b37d91b..8d65a81e 100644
--- a/src/runtime/netpoll.go
+++ b/src/runtime/netpoll.go
@@ -8,7 +8,7 @@ package runtime
 
 import (
 	"internal/runtime/atomic"
-	"runtime/internal/sys"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
@@ -31,7 +31,7 @@ import (
 //     poll without blocking. If delta > 0, block for up to delta nanoseconds.
 //     Return a list of goroutines built by calling netpollready,
 //     and a delta to add to netpollWaiters when all goroutines are ready.
-//     This will never return an empty list with a non-zero delta.
+//     This must never return an empty list with a non-zero delta.
 //
 // func netpollBreak()
 //     Wake up the network poller, assumed to be blocked in netpoll.
@@ -714,7 +714,7 @@ func (c *pollCache) alloc() *pollDesc {
 // makeArg converts pd to an interface{}.
 // makeArg does not do any allocation. Normally, such
 // a conversion requires an allocation because pointers to
-// types which embed runtime/internal/sys.NotInHeap (which pollDesc is)
+// types which embed internal/runtime/sys.NotInHeap (which pollDesc is)
 // must be stored in interfaces indirectly. See issue 42076.
 func (pd *pollDesc) makeArg() (i any) {
 	x := (*eface)(unsafe.Pointer(&i))
diff --git a/src/runtime/netpoll_aix.go b/src/runtime/netpoll_aix.go
index 2df5a571..4cf34d1c 100644
--- a/src/runtime/netpoll_aix.go
+++ b/src/runtime/netpoll_aix.go
@@ -148,7 +148,10 @@ func netpollBreak() {
 }
 
 // netpoll checks for ready network connections.
-// Returns list of goroutines that become runnable.
+// Returns a list of goroutines that become runnable,
+// and a delta to add to netpollWaiters.
+// This must never return an empty list with a non-zero delta.
+//
 // delay < 0: blocks indefinitely
 // delay == 0: does not block, just polls
 // delay > 0: block for up to that many nanoseconds
diff --git a/src/runtime/netpoll_epoll.go b/src/runtime/netpoll_epoll.go
index ff6e0b5f..c43bab08 100644
--- a/src/runtime/netpoll_epoll.go
+++ b/src/runtime/netpoll_epoll.go
@@ -89,7 +89,10 @@ func netpollBreak() {
 }
 
 // netpoll checks for ready network connections.
-// Returns list of goroutines that become runnable.
+// Returns a list of goroutines that become runnable,
+// and a delta to add to netpollWaiters.
+// This must never return an empty list with a non-zero delta.
+//
 // delay < 0: blocks indefinitely
 // delay == 0: does not block, just polls
 // delay > 0: block for up to that many nanoseconds
diff --git a/src/runtime/netpoll_kqueue.go b/src/runtime/netpoll_kqueue.go
index 6cd80d5c..db4dddc2 100644
--- a/src/runtime/netpoll_kqueue.go
+++ b/src/runtime/netpoll_kqueue.go
@@ -80,7 +80,10 @@ func netpollBreak() {
 }
 
 // netpoll checks for ready network connections.
-// Returns list of goroutines that become runnable.
+// Returns a list of goroutines that become runnable,
+// and a delta to add to netpollWaiters.
+// This must never return an empty list with a non-zero delta.
+//
 // delay < 0: blocks indefinitely
 // delay == 0: does not block, just polls
 // delay > 0: block for up to that many nanoseconds
@@ -126,10 +129,11 @@ retry:
 		ev := &events[i]
 
 		if isWakeup(ev) {
-			if delay != 0 {
+			isBlocking := delay != 0
+			processWakeupEvent(kq, isBlocking)
+			if isBlocking {
 				// netpollBreak could be picked up by a nonblocking poll.
-				// Only call drainWakeupEvent and reset the netpollWakeSig if blocking.
-				drainWakeupEvent(kq)
+				// Only reset the netpollWakeSig if blocking.
 				netpollWakeSig.Store(0)
 			}
 			continue
diff --git a/src/runtime/netpoll_kqueue_event.go b/src/runtime/netpoll_kqueue_event.go
index d5f783e6..852a00a5 100644
--- a/src/runtime/netpoll_kqueue_event.go
+++ b/src/runtime/netpoll_kqueue_event.go
@@ -16,7 +16,7 @@ func addWakeupEvent(kq int32) {
 	ev := keventt{
 		ident:  kqIdent,
 		filter: _EVFILT_USER,
-		flags:  _EV_ADD,
+		flags:  _EV_ADD | _EV_CLEAR,
 	}
 	for {
 		n := kevent(kq, &ev, 1, nil, 0, nil)
@@ -38,7 +38,6 @@ func wakeNetpoll(kq int32) {
 	ev := keventt{
 		ident:  kqIdent,
 		filter: _EVFILT_USER,
-		flags:  _EV_ENABLE,
 		fflags: _NOTE_TRIGGER,
 	}
 	for {
@@ -66,13 +65,11 @@ func isWakeup(ev *keventt) bool {
 	return false
 }
 
-func drainWakeupEvent(kq int32) {
-	ev := keventt{
-		ident:  kqIdent,
-		filter: _EVFILT_USER,
-		flags:  _EV_DISABLE,
+func processWakeupEvent(kq int32, isBlocking bool) {
+	if !isBlocking {
+		// Got a wrong thread, relay
+		wakeNetpoll(kq)
 	}
-	kevent(kq, &ev, 1, nil, 0, nil)
 }
 
 func netpollIsPollDescriptor(fd uintptr) bool {
diff --git a/src/runtime/netpoll_kqueue_pipe.go b/src/runtime/netpoll_kqueue_pipe.go
index 98f73e84..cf1e2afa 100644
--- a/src/runtime/netpoll_kqueue_pipe.go
+++ b/src/runtime/netpoll_kqueue_pipe.go
@@ -63,7 +63,11 @@ func isWakeup(ev *keventt) bool {
 	return false
 }
 
-func drainWakeupEvent(_ int32) {
+func processWakeupEvent(_ int32, isBlocking bool) {
+	// Only drain if blocking.
+	if !isBlocking {
+		return
+	}
 	var buf [16]byte
 	read(int32(netpollBreakRd), noescape(unsafe.Pointer(&buf[0])), int32(len(buf)))
 }
diff --git a/src/runtime/netpoll_solaris.go b/src/runtime/netpoll_solaris.go
index fddc2900..90459c08 100644
--- a/src/runtime/netpoll_solaris.go
+++ b/src/runtime/netpoll_solaris.go
@@ -215,7 +215,10 @@ func netpollBreak() {
 }
 
 // netpoll checks for ready network connections.
-// Returns list of goroutines that become runnable.
+// Returns a list of goroutines that become runnable,
+// and a delta to add to netpollWaiters.
+// This must never return an empty list with a non-zero delta.
+//
 // delay < 0: blocks indefinitely
 // delay == 0: does not block, just polls
 // delay > 0: block for up to that many nanoseconds
diff --git a/src/runtime/netpoll_stub.go b/src/runtime/netpoll_stub.go
index c1bda3fa..dc5d708b 100644
--- a/src/runtime/netpoll_stub.go
+++ b/src/runtime/netpoll_stub.go
@@ -32,7 +32,9 @@ func netpollBreak() {
 }
 
 // Polls for ready network connections.
-// Returns list of goroutines that become runnable.
+// Returns a list of goroutines that become runnable,
+// and a delta to add to netpollWaiters.
+// This must never return an empty list with a non-zero delta.
 func netpoll(delay int64) (gList, int32) {
 	// Implementation for platforms that do not support
 	// integrated network poller.
diff --git a/src/runtime/netpoll_wasip1.go b/src/runtime/netpoll_wasip1.go
index e6b299a2..c7e66a64 100644
--- a/src/runtime/netpoll_wasip1.go
+++ b/src/runtime/netpoll_wasip1.go
@@ -209,7 +209,7 @@ func netpoll(delay int64) (gList, int32) {
 
 retry:
 	var nevents size
-	errno := poll_oneoff(unsafe.Pointer(&pollsubs[0]), unsafe.Pointer(&evts[0]), uint32(len(pollsubs)), unsafe.Pointer(&nevents))
+	errno := poll_oneoff(&pollsubs[0], &evts[0], uint32(len(pollsubs)), &nevents)
 	if errno != 0 {
 		if errno != _EINTR {
 			println("errno=", errno, " len(pollsubs)=", len(pollsubs))
diff --git a/src/runtime/netpoll_windows.go b/src/runtime/netpoll_windows.go
index c3c10af7..fb35d41c 100644
--- a/src/runtime/netpoll_windows.go
+++ b/src/runtime/netpoll_windows.go
@@ -144,7 +144,10 @@ func netpollBreak() {
 }
 
 // netpoll checks for ready network connections.
-// Returns list of goroutines that become runnable.
+// Returns a list of goroutines that become runnable,
+// and a delta to add to netpollWaiters.
+// This must never return an empty list with a non-zero delta.
+//
 // delay < 0: blocks indefinitely
 // delay == 0: does not block, just polls
 // delay > 0: block for up to that many nanoseconds
diff --git a/src/runtime/norace_linux_test.go b/src/runtime/nosan_linux_test.go
similarity index 76%
rename from src/runtime/norace_linux_test.go
rename to src/runtime/nosan_linux_test.go
index 3521b246..5c99591a 100644
--- a/src/runtime/norace_linux_test.go
+++ b/src/runtime/nosan_linux_test.go
@@ -2,9 +2,9 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// The file contains tests that cannot run under race detector for some reason.
+// The file contains tests that cannot run under race detector (or asan or msan) for some reason.
 //
-//go:build !race
+//go:build !race && !asan && !msan
 
 package runtime_test
 
@@ -23,7 +23,7 @@ func newOSProcCreated() {
 	newOSProcDone = true
 }
 
-// Can't be run with -race because it inserts calls into newOSProcCreated()
+// Can't be run with -race, -asan, or -msan because it inserts calls into newOSProcCreated()
 // that require a valid G/M.
 func TestNewOSProc0(t *testing.T) {
 	runtime.NewOSProc0(0x800000, unsafe.Pointer(abi.FuncPCABIInternal(newOSProcCreated)))
diff --git a/src/runtime/note_js.go b/src/runtime/note_js.go
new file mode 100644
index 00000000..be43fa42
--- /dev/null
+++ b/src/runtime/note_js.go
@@ -0,0 +1,40 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package runtime
+
+// sleep and wakeup on one-time events.
+// before any calls to notesleep or notewakeup,
+// must call noteclear to initialize the Note.
+// then, exactly one thread can call notesleep
+// and exactly one thread can call notewakeup (once).
+// once notewakeup has been called, the notesleep
+// will return.  future notesleep will return immediately.
+// subsequent noteclear must be called only after
+// previous notesleep has returned, e.g. it's disallowed
+// to call noteclear straight after notewakeup.
+//
+// notetsleep is like notesleep but wakes up after
+// a given number of nanoseconds even if the event
+// has not yet happened.  if a goroutine uses notetsleep to
+// wake up early, it must wait to call noteclear until it
+// can be sure that no other goroutine is calling
+// notewakeup.
+//
+// notesleep/notetsleep are generally called on g0,
+// notetsleepg is similar to notetsleep but is called on user g.
+type note struct {
+	status int32
+
+	// The G waiting on this note.
+	gp *g
+
+	// Deadline, if any. 0 indicates no timeout.
+	deadline int64
+
+	// allprev and allnext are used to form the allDeadlineNotes linked
+	// list. These are unused if there is no deadline.
+	allprev *note
+	allnext *note
+}
diff --git a/src/runtime/note_other.go b/src/runtime/note_other.go
new file mode 100644
index 00000000..7f62c1c6
--- /dev/null
+++ b/src/runtime/note_other.go
@@ -0,0 +1,33 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build !js
+
+package runtime
+
+// sleep and wakeup on one-time events.
+// before any calls to notesleep or notewakeup,
+// must call noteclear to initialize the Note.
+// then, exactly one thread can call notesleep
+// and exactly one thread can call notewakeup (once).
+// once notewakeup has been called, the notesleep
+// will return.  future notesleep will return immediately.
+// subsequent noteclear must be called only after
+// previous notesleep has returned, e.g. it's disallowed
+// to call noteclear straight after notewakeup.
+//
+// notetsleep is like notesleep but wakes up after
+// a given number of nanoseconds even if the event
+// has not yet happened.  if a goroutine uses notetsleep to
+// wake up early, it must wait to call noteclear until it
+// can be sure that no other goroutine is calling
+// notewakeup.
+//
+// notesleep/notetsleep are generally called on g0,
+// notetsleepg is similar to notetsleep but is called on user g.
+type note struct {
+	// Futex-based impl treats it as uint32 key,
+	// while sema-based impl as M* waitm.
+	key uintptr
+}
diff --git a/src/runtime/os2_aix.go b/src/runtime/os2_aix.go
index 0d200792..51758bd3 100644
--- a/src/runtime/os2_aix.go
+++ b/src/runtime/os2_aix.go
@@ -11,6 +11,7 @@
 package runtime
 
 import (
+	"internal/runtime/sys"
 	"unsafe"
 )
 
@@ -182,10 +183,10 @@ func syscall0(fn *libFunc) (r, err uintptr) {
 	resetLibcall := true
 	if mp.libcallsp == 0 {
 		mp.libcallg.set(gp)
-		mp.libcallpc = getcallerpc()
+		mp.libcallpc = sys.GetCallerPC()
 		// sp must be the last, because once async cpu profiler finds
 		// all three values to be non-zero, it will use them
-		mp.libcallsp = getcallersp()
+		mp.libcallsp = sys.GetCallerSP()
 	} else {
 		resetLibcall = false // See comment in sys_darwin.go:libcCall
 	}
@@ -213,10 +214,10 @@ func syscall1(fn *libFunc, a0 uintptr) (r, err uintptr) {
 	resetLibcall := true
 	if mp.libcallsp == 0 {
 		mp.libcallg.set(gp)
-		mp.libcallpc = getcallerpc()
+		mp.libcallpc = sys.GetCallerPC()
 		// sp must be the last, because once async cpu profiler finds
 		// all three values to be non-zero, it will use them
-		mp.libcallsp = getcallersp()
+		mp.libcallsp = sys.GetCallerSP()
 	} else {
 		resetLibcall = false // See comment in sys_darwin.go:libcCall
 	}
@@ -245,10 +246,10 @@ func syscall2(fn *libFunc, a0, a1 uintptr) (r, err uintptr) {
 	resetLibcall := true
 	if mp.libcallsp == 0 {
 		mp.libcallg.set(gp)
-		mp.libcallpc = getcallerpc()
+		mp.libcallpc = sys.GetCallerPC()
 		// sp must be the last, because once async cpu profiler finds
 		// all three values to be non-zero, it will use them
-		mp.libcallsp = getcallersp()
+		mp.libcallsp = sys.GetCallerSP()
 	} else {
 		resetLibcall = false // See comment in sys_darwin.go:libcCall
 	}
@@ -277,10 +278,10 @@ func syscall3(fn *libFunc, a0, a1, a2 uintptr) (r, err uintptr) {
 	resetLibcall := true
 	if mp.libcallsp == 0 {
 		mp.libcallg.set(gp)
-		mp.libcallpc = getcallerpc()
+		mp.libcallpc = sys.GetCallerPC()
 		// sp must be the last, because once async cpu profiler finds
 		// all three values to be non-zero, it will use them
-		mp.libcallsp = getcallersp()
+		mp.libcallsp = sys.GetCallerSP()
 	} else {
 		resetLibcall = false // See comment in sys_darwin.go:libcCall
 	}
@@ -309,10 +310,10 @@ func syscall4(fn *libFunc, a0, a1, a2, a3 uintptr) (r, err uintptr) {
 	resetLibcall := true
 	if mp.libcallsp == 0 {
 		mp.libcallg.set(gp)
-		mp.libcallpc = getcallerpc()
+		mp.libcallpc = sys.GetCallerPC()
 		// sp must be the last, because once async cpu profiler finds
 		// all three values to be non-zero, it will use them
-		mp.libcallsp = getcallersp()
+		mp.libcallsp = sys.GetCallerSP()
 	} else {
 		resetLibcall = false // See comment in sys_darwin.go:libcCall
 	}
@@ -341,10 +342,10 @@ func syscall5(fn *libFunc, a0, a1, a2, a3, a4 uintptr) (r, err uintptr) {
 	resetLibcall := true
 	if mp.libcallsp == 0 {
 		mp.libcallg.set(gp)
-		mp.libcallpc = getcallerpc()
+		mp.libcallpc = sys.GetCallerPC()
 		// sp must be the last, because once async cpu profiler finds
 		// all three values to be non-zero, it will use them
-		mp.libcallsp = getcallersp()
+		mp.libcallsp = sys.GetCallerSP()
 	} else {
 		resetLibcall = false // See comment in sys_darwin.go:libcCall
 	}
@@ -373,10 +374,10 @@ func syscall6(fn *libFunc, a0, a1, a2, a3, a4, a5 uintptr) (r, err uintptr) {
 	resetLibcall := true
 	if mp.libcallsp == 0 {
 		mp.libcallg.set(gp)
-		mp.libcallpc = getcallerpc()
+		mp.libcallpc = sys.GetCallerPC()
 		// sp must be the last, because once async cpu profiler finds
 		// all three values to be non-zero, it will use them
-		mp.libcallsp = getcallersp()
+		mp.libcallsp = sys.GetCallerSP()
 	} else {
 		resetLibcall = false // See comment in sys_darwin.go:libcCall
 	}
diff --git a/src/runtime/os_darwin.go b/src/runtime/os_darwin.go
index 430d1865..0ecbea7a 100644
--- a/src/runtime/os_darwin.go
+++ b/src/runtime/os_darwin.go
@@ -6,6 +6,7 @@ package runtime
 
 import (
 	"internal/abi"
+	"internal/stringslite"
 	"unsafe"
 )
 
@@ -191,14 +192,10 @@ func getPageSize() uintptr {
 	return 0
 }
 
-var urandom_dev = []byte("/dev/urandom\x00")
-
 //go:nosplit
 func readRandom(r []byte) int {
-	fd := open(&urandom_dev[0], 0 /* O_RDONLY */, 0)
-	n := read(fd, unsafe.Pointer(&r[0]), int32(len(r)))
-	closefd(fd)
-	return int(n)
+	arc4random_buf(unsafe.Pointer(&r[0]), int32(len(r)))
+	return len(r)
 }
 
 func goenvs() {
@@ -465,10 +462,7 @@ func sysargs(argc int32, argv **byte) {
 	executablePath = gostringnocopy(argv_index(argv, n+1))
 
 	// strip "executable_path=" prefix if available, it's added after OS X 10.11.
-	const prefix = "executable_path="
-	if len(executablePath) > len(prefix) && executablePath[:len(prefix)] == prefix {
-		executablePath = executablePath[len(prefix):]
-	}
+	executablePath = stringslite.TrimPrefix(executablePath, "executable_path=")
 }
 
 func signalM(mp *m, sig int) {
diff --git a/src/runtime/os_dragonfly.go b/src/runtime/os_dragonfly.go
index 2aeea177..a02696eb 100644
--- a/src/runtime/os_dragonfly.go
+++ b/src/runtime/os_dragonfly.go
@@ -19,7 +19,9 @@ const (
 	_SIG_SETMASK = 3
 )
 
-type mOS struct{}
+type mOS struct {
+	waitsema uint32 // semaphore for parking on locks
+}
 
 //go:noescape
 func lwp_create(param *lwpparams) int32
diff --git a/src/runtime/os_freebsd.go b/src/runtime/os_freebsd.go
index d0d6f14f..3187317a 100644
--- a/src/runtime/os_freebsd.go
+++ b/src/runtime/os_freebsd.go
@@ -10,7 +10,9 @@ import (
 	"unsafe"
 )
 
-type mOS struct{}
+type mOS struct {
+	waitsema uint32 // semaphore for parking on locks
+}
 
 //go:noescape
 func thr_new(param *thrparam, size int32) int32
diff --git a/src/runtime/os_linux.go b/src/runtime/os_linux.go
index e80d390e..8b3c4d0e 100644
--- a/src/runtime/os_linux.go
+++ b/src/runtime/os_linux.go
@@ -31,6 +31,12 @@ type mOS struct {
 	// needPerThreadSyscall indicates that a per-thread syscall is required
 	// for doAllThreadsSyscall.
 	needPerThreadSyscall atomic.Uint8
+
+	// This is a pointer to a chunk of memory allocated with a special
+	// mmap invocation in vgetrandomGetState().
+	vgetrandomState uintptr
+
+	waitsema uint32 // semaphore for parking on locks
 }
 
 //go:noescape
@@ -292,13 +298,19 @@ func sysargs(argc int32, argv **byte) {
 var secureMode bool
 
 func sysauxv(auxv []uintptr) (pairs int) {
+	// Process the auxiliary vector entries provided by the kernel when the
+	// program is executed. See getauxval(3).
 	var i int
 	for ; auxv[i] != _AT_NULL; i += 2 {
 		tag, val := auxv[i], auxv[i+1]
 		switch tag {
 		case _AT_RANDOM:
-			// The kernel provides a pointer to 16-bytes
-			// worth of random data.
+			// The kernel provides a pointer to 16 bytes of cryptographically
+			// random data. Note that in cgo programs this value may have
+			// already been used by libc at this point, and in particular glibc
+			// and musl use the value as-is for stack and pointer protector
+			// cookies from libc_start_main and/or dl_start. Also, cgo programs
+			// may use the value after we do.
 			startupRand = (*[16]byte)(unsafe.Pointer(val))[:]
 
 		case _AT_PAGESZ:
@@ -344,11 +356,14 @@ func osinit() {
 	ncpu = getproccount()
 	physHugePageSize = getHugePageSize()
 	osArchInit()
+	vgetrandomInit()
 }
 
 var urandom_dev = []byte("/dev/urandom\x00")
 
 func readRandom(r []byte) int {
+	// Note that all supported Linux kernels should provide AT_RANDOM which
+	// populates startupRand, so this fallback should be unreachable.
 	fd := open(&urandom_dev[0], 0 /* O_RDONLY */, 0)
 	n := read(fd, unsafe.Pointer(&r[0]), int32(len(r)))
 	closefd(fd)
@@ -400,6 +415,10 @@ func unminit() {
 // Called from exitm, but not from drop, to undo the effect of thread-owned
 // resources in minit, semacreate, or elsewhere. Do not take locks after calling this.
 func mdestroy(mp *m) {
+	if mp.vgetrandomState != 0 {
+		vgetrandomPutState(mp.vgetrandomState)
+		mp.vgetrandomState = 0
+	}
 }
 
 // #ifdef GOARCH_386
@@ -636,7 +655,7 @@ func setThreadCPUProfiler(hz int32) {
 	// spend shows up as a 10% chance of one sample (for an expected value of
 	// 0.1 samples), and so that "two and six tenths" periods of CPU spend show
 	// up as a 60% chance of 3 samples and a 40% chance of 2 samples (for an
-	// expected value of 2.6). Set the initial delay to a value in the unifom
+	// expected value of 2.6). Set the initial delay to a value in the uniform
 	// random distribution between 0 and the desired period. And because "0"
 	// means "disable timer", add 1 so the half-open interval [0,period) turns
 	// into (0,period].
diff --git a/src/runtime/os_linux_loong64.go b/src/runtime/os_linux_loong64.go
index 61213dad..03926feb 100644
--- a/src/runtime/os_linux_loong64.go
+++ b/src/runtime/os_linux_loong64.go
@@ -6,6 +6,13 @@
 
 package runtime
 
-func archauxv(tag, val uintptr) {}
+import "internal/cpu"
+
+func archauxv(tag, val uintptr) {
+	switch tag {
+	case _AT_HWCAP:
+		cpu.HWCap = uint(val)
+	}
+}
 
 func osArchInit() {}
diff --git a/src/runtime/os_openbsd.go b/src/runtime/os_openbsd.go
index 9a21d6a8..574bfa8b 100644
--- a/src/runtime/os_openbsd.go
+++ b/src/runtime/os_openbsd.go
@@ -139,6 +139,9 @@ func osinit() {
 	physPageSize = getPageSize()
 }
 
+// TODO(#69781): set startupRand using the .openbsd.randomdata ELF section.
+// See SPECS.randomdata.
+
 var urandom_dev = []byte("/dev/urandom\x00")
 
 //go:nosplit
diff --git a/src/runtime/os_solaris.go b/src/runtime/os_solaris.go
index bc00698c..5f6163f1 100644
--- a/src/runtime/os_solaris.go
+++ b/src/runtime/os_solaris.go
@@ -4,7 +4,10 @@
 
 package runtime
 
-import "unsafe"
+import (
+	"internal/runtime/sys"
+	"unsafe"
+)
 
 type mts struct {
 	tv_sec  int64
@@ -42,10 +45,10 @@ func sysvicall0(fn *libcFunc) uintptr {
 	}
 	if mp != nil && mp.libcallsp == 0 {
 		mp.libcallg.set(gp)
-		mp.libcallpc = getcallerpc()
+		mp.libcallpc = sys.GetCallerPC()
 		// sp must be the last, because once async cpu profiler finds
 		// all three values to be non-zero, it will use them
-		mp.libcallsp = getcallersp()
+		mp.libcallsp = sys.GetCallerSP()
 	} else {
 		mp = nil // See comment in sys_darwin.go:libcCall
 	}
@@ -80,10 +83,10 @@ func sysvicall1Err(fn *libcFunc, a1 uintptr) (r1, err uintptr) {
 	}
 	if mp != nil && mp.libcallsp == 0 {
 		mp.libcallg.set(gp)
-		mp.libcallpc = getcallerpc()
+		mp.libcallpc = sys.GetCallerPC()
 		// sp must be the last, because once async cpu profiler finds
 		// all three values to be non-zero, it will use them
-		mp.libcallsp = getcallersp()
+		mp.libcallsp = sys.GetCallerSP()
 	} else {
 		mp = nil
 	}
@@ -120,10 +123,10 @@ func sysvicall2Err(fn *libcFunc, a1, a2 uintptr) (uintptr, uintptr) {
 	}
 	if mp != nil && mp.libcallsp == 0 {
 		mp.libcallg.set(gp)
-		mp.libcallpc = getcallerpc()
+		mp.libcallpc = sys.GetCallerPC()
 		// sp must be the last, because once async cpu profiler finds
 		// all three values to be non-zero, it will use them
-		mp.libcallsp = getcallersp()
+		mp.libcallsp = sys.GetCallerSP()
 	} else {
 		mp = nil
 	}
@@ -159,10 +162,10 @@ func sysvicall3Err(fn *libcFunc, a1, a2, a3 uintptr) (r1, err uintptr) {
 	}
 	if mp != nil && mp.libcallsp == 0 {
 		mp.libcallg.set(gp)
-		mp.libcallpc = getcallerpc()
+		mp.libcallpc = sys.GetCallerPC()
 		// sp must be the last, because once async cpu profiler finds
 		// all three values to be non-zero, it will use them
-		mp.libcallsp = getcallersp()
+		mp.libcallsp = sys.GetCallerSP()
 	} else {
 		mp = nil
 	}
@@ -189,10 +192,10 @@ func sysvicall4(fn *libcFunc, a1, a2, a3, a4 uintptr) uintptr {
 	}
 	if mp != nil && mp.libcallsp == 0 {
 		mp.libcallg.set(gp)
-		mp.libcallpc = getcallerpc()
+		mp.libcallpc = sys.GetCallerPC()
 		// sp must be the last, because once async cpu profiler finds
 		// all three values to be non-zero, it will use them
-		mp.libcallsp = getcallersp()
+		mp.libcallsp = sys.GetCallerSP()
 	} else {
 		mp = nil
 	}
@@ -219,10 +222,10 @@ func sysvicall5(fn *libcFunc, a1, a2, a3, a4, a5 uintptr) uintptr {
 	}
 	if mp != nil && mp.libcallsp == 0 {
 		mp.libcallg.set(gp)
-		mp.libcallpc = getcallerpc()
+		mp.libcallpc = sys.GetCallerPC()
 		// sp must be the last, because once async cpu profiler finds
 		// all three values to be non-zero, it will use them
-		mp.libcallsp = getcallersp()
+		mp.libcallsp = sys.GetCallerSP()
 	} else {
 		mp = nil
 	}
@@ -249,10 +252,10 @@ func sysvicall6(fn *libcFunc, a1, a2, a3, a4, a5, a6 uintptr) uintptr {
 	}
 	if mp != nil && mp.libcallsp == 0 {
 		mp.libcallg.set(gp)
-		mp.libcallpc = getcallerpc()
+		mp.libcallpc = sys.GetCallerPC()
 		// sp must be the last, because once async cpu profiler finds
 		// all three values to be non-zero, it will use them
-		mp.libcallsp = getcallersp()
+		mp.libcallsp = sys.GetCallerSP()
 	} else {
 		mp = nil
 	}
diff --git a/src/runtime/os_wasip1.go b/src/runtime/os_wasip1.go
index acac2b3f..ed4f646a 100644
--- a/src/runtime/os_wasip1.go
+++ b/src/runtime/os_wasip1.go
@@ -6,7 +6,10 @@
 
 package runtime
 
-import "unsafe"
+import (
+	"structs"
+	"unsafe"
+)
 
 // GOARCH=wasm currently has 64 bits pointers, but the WebAssembly host expects
 // pointers to be 32 bits so we use this type alias to represent pointers in
@@ -48,31 +51,31 @@ func exit(code int32)
 
 //go:wasmimport wasi_snapshot_preview1 args_get
 //go:noescape
-func args_get(argv, argvBuf unsafe.Pointer) errno
+func args_get(argv *uintptr32, argvBuf *byte) errno
 
 //go:wasmimport wasi_snapshot_preview1 args_sizes_get
 //go:noescape
-func args_sizes_get(argc, argvBufLen unsafe.Pointer) errno
+func args_sizes_get(argc, argvBufLen *size) errno
 
 //go:wasmimport wasi_snapshot_preview1 clock_time_get
 //go:noescape
-func clock_time_get(clock_id clockid, precision timestamp, time unsafe.Pointer) errno
+func clock_time_get(clock_id clockid, precision timestamp, time *timestamp) errno
 
 //go:wasmimport wasi_snapshot_preview1 environ_get
 //go:noescape
-func environ_get(environ, environBuf unsafe.Pointer) errno
+func environ_get(environ *uintptr32, environBuf *byte) errno
 
 //go:wasmimport wasi_snapshot_preview1 environ_sizes_get
 //go:noescape
-func environ_sizes_get(environCount, environBufLen unsafe.Pointer) errno
+func environ_sizes_get(environCount, environBufLen *size) errno
 
 //go:wasmimport wasi_snapshot_preview1 fd_write
 //go:noescape
-func fd_write(fd int32, iovs unsafe.Pointer, iovsLen size, nwritten unsafe.Pointer) errno
+func fd_write(fd int32, iovs unsafe.Pointer, iovsLen size, nwritten *size) errno
 
 //go:wasmimport wasi_snapshot_preview1 random_get
 //go:noescape
-func random_get(buf unsafe.Pointer, bufLen size) errno
+func random_get(buf *byte, bufLen size) errno
 
 type eventtype = uint8
 
@@ -99,6 +102,7 @@ type userdata = uint64
 // struct size because errno is declared as a 32 bits type, so we declare the
 // error field as a plain uint16.
 type event struct {
+	_           structs.HostLayout
 	userdata    userdata
 	error       uint16
 	typ         eventtype
@@ -106,6 +110,7 @@ type event struct {
 }
 
 type eventFdReadwrite struct {
+	_      structs.HostLayout
 	nbytes filesize
 	flags  eventrwflags
 }
@@ -117,6 +122,7 @@ const (
 )
 
 type subscriptionClock struct {
+	_         structs.HostLayout
 	id        clockid
 	timeout   timestamp
 	precision timestamp
@@ -124,10 +130,12 @@ type subscriptionClock struct {
 }
 
 type subscriptionFdReadwrite struct {
+	_  structs.HostLayout
 	fd int32
 }
 
 type subscription struct {
+	_        structs.HostLayout
 	userdata userdata
 	u        subscriptionUnion
 }
@@ -148,7 +156,7 @@ func (u *subscriptionUnion) subscriptionFdReadwrite() *subscriptionFdReadwrite {
 
 //go:wasmimport wasi_snapshot_preview1 poll_oneoff
 //go:noescape
-func poll_oneoff(in, out unsafe.Pointer, nsubscriptions size, nevents unsafe.Pointer) errno
+func poll_oneoff(in *subscription, out *event, nsubscriptions size, nevents *size) errno
 
 func write1(fd uintptr, p unsafe.Pointer, n int32) int32 {
 	iov := iovec{
@@ -156,7 +164,7 @@ func write1(fd uintptr, p unsafe.Pointer, n int32) int32 {
 		bufLen: size(n),
 	}
 	var nwritten size
-	if fd_write(int32(fd), unsafe.Pointer(&iov), 1, unsafe.Pointer(&nwritten)) != 0 {
+	if fd_write(int32(fd), unsafe.Pointer(&iov), 1, &nwritten) != 0 {
 		throw("fd_write failed")
 	}
 	return int32(nwritten)
@@ -175,13 +183,13 @@ func usleep(usec uint32) {
 	subscription.timeout = timestamp(usec) * 1e3
 	subscription.precision = 1e3
 
-	if poll_oneoff(unsafe.Pointer(&in), unsafe.Pointer(&out), 1, unsafe.Pointer(&nevents)) != 0 {
+	if poll_oneoff(&in, &out, 1, &nevents) != 0 {
 		throw("wasi_snapshot_preview1.poll_oneoff")
 	}
 }
 
 func readRandom(r []byte) int {
-	if random_get(unsafe.Pointer(&r[0]), size(len(r))) != 0 {
+	if random_get(&r[0], size(len(r))) != 0 {
 		return 0
 	}
 	return len(r)
@@ -191,7 +199,7 @@ func goenvs() {
 	// arguments
 	var argc size
 	var argvBufLen size
-	if args_sizes_get(unsafe.Pointer(&argc), unsafe.Pointer(&argvBufLen)) != 0 {
+	if args_sizes_get(&argc, &argvBufLen) != 0 {
 		throw("args_sizes_get failed")
 	}
 
@@ -199,7 +207,7 @@ func goenvs() {
 	if argc > 0 {
 		argv := make([]uintptr32, argc)
 		argvBuf := make([]byte, argvBufLen)
-		if args_get(unsafe.Pointer(&argv[0]), unsafe.Pointer(&argvBuf[0])) != 0 {
+		if args_get(&argv[0], &argvBuf[0]) != 0 {
 			throw("args_get failed")
 		}
 
@@ -216,7 +224,7 @@ func goenvs() {
 	// environment
 	var environCount size
 	var environBufLen size
-	if environ_sizes_get(unsafe.Pointer(&environCount), unsafe.Pointer(&environBufLen)) != 0 {
+	if environ_sizes_get(&environCount, &environBufLen) != 0 {
 		throw("environ_sizes_get failed")
 	}
 
@@ -224,7 +232,7 @@ func goenvs() {
 	if environCount > 0 {
 		environ := make([]uintptr32, environCount)
 		environBuf := make([]byte, environBufLen)
-		if environ_get(unsafe.Pointer(&environ[0]), unsafe.Pointer(&environBuf[0])) != 0 {
+		if environ_get(&environ[0], &environBuf[0]) != 0 {
 			throw("environ_get failed")
 		}
 
@@ -245,7 +253,7 @@ func walltime() (sec int64, nsec int32) {
 
 func walltime1() (sec int64, nsec int32) {
 	var time timestamp
-	if clock_time_get(clockRealtime, 0, unsafe.Pointer(&time)) != 0 {
+	if clock_time_get(clockRealtime, 0, &time) != 0 {
 		throw("clock_time_get failed")
 	}
 	return int64(time / 1000000000), int32(time % 1000000000)
@@ -253,7 +261,7 @@ func walltime1() (sec int64, nsec int32) {
 
 func nanotime1() int64 {
 	var time timestamp
-	if clock_time_get(clockMonotonic, 0, unsafe.Pointer(&time)) != 0 {
+	if clock_time_get(clockMonotonic, 0, &time) != 0 {
 		throw("clock_time_get failed")
 	}
 	return int64(time)
diff --git a/src/runtime/os_wasm.go b/src/runtime/os_wasm.go
index fbafc319..8046caf4 100644
--- a/src/runtime/os_wasm.go
+++ b/src/runtime/os_wasm.go
@@ -13,6 +13,7 @@ func osinit() {
 	// https://webassembly.github.io/spec/core/exec/runtime.html#memory-instances
 	physPageSize = 64 * 1024
 	initBloc()
+	blocMax = uintptr(currentMemory()) * physPageSize // record the initial linear memory size
 	ncpu = 1
 	getg().m.procid = 2
 }
@@ -96,7 +97,7 @@ func signame(sig uint32) string {
 }
 
 func crash() {
-	*(*int32)(nil) = 0
+	abort()
 }
 
 func initsig(preinit bool) {
@@ -109,10 +110,10 @@ func newosproc(mp *m) {
 	throw("newosproc: not implemented")
 }
 
+// Do nothing on WASM platform, always return EPIPE to caller.
+//
 //go:linkname os_sigpipe os.sigpipe
-func os_sigpipe() {
-	throw("too many writes on closed pipe")
-}
+func os_sigpipe() {}
 
 //go:linkname syscall_now syscall.now
 func syscall_now() (sec int64, nsec int32) {
diff --git a/src/runtime/os_windows.go b/src/runtime/os_windows.go
index c76df9da..c85fab7b 100644
--- a/src/runtime/os_windows.go
+++ b/src/runtime/os_windows.go
@@ -8,6 +8,7 @@ import (
 	"internal/abi"
 	"internal/goarch"
 	"internal/runtime/atomic"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
@@ -1025,10 +1026,10 @@ func stdcall(fn stdFunction) uintptr {
 	if mp.profilehz != 0 && mp.libcallsp == 0 {
 		// leave pc/sp for cpu profiler
 		mp.libcallg.set(gp)
-		mp.libcallpc = getcallerpc()
+		mp.libcallpc = sys.GetCallerPC()
 		// sp must be the last, because once async cpu profiler finds
 		// all three values to be non-zero, it will use them
-		mp.libcallsp = getcallersp()
+		mp.libcallsp = sys.GetCallerSP()
 		resetLibcall = true // See comment in sys_darwin.go:libcCall
 	}
 	asmcgocall(asmstdcallAddr, unsafe.Pointer(&mp.libcall))
diff --git a/src/runtime/panic.go b/src/runtime/panic.go
index 98e96b12..3ffb3966 100644
--- a/src/runtime/panic.go
+++ b/src/runtime/panic.go
@@ -8,8 +8,8 @@ import (
 	"internal/abi"
 	"internal/goarch"
 	"internal/runtime/atomic"
+	"internal/runtime/sys"
 	"internal/stringslite"
-	"runtime/internal/sys"
 	"unsafe"
 )
 
@@ -111,13 +111,13 @@ func panicCheck2(err string) {
 //
 //go:yeswritebarrierrec
 func goPanicIndex(x int, y int) {
-	panicCheck1(getcallerpc(), "index out of range")
+	panicCheck1(sys.GetCallerPC(), "index out of range")
 	panic(boundsError{x: int64(x), signed: true, y: y, code: boundsIndex})
 }
 
 //go:yeswritebarrierrec
 func goPanicIndexU(x uint, y int) {
-	panicCheck1(getcallerpc(), "index out of range")
+	panicCheck1(sys.GetCallerPC(), "index out of range")
 	panic(boundsError{x: int64(x), signed: false, y: y, code: boundsIndex})
 }
 
@@ -125,25 +125,25 @@ func goPanicIndexU(x uint, y int) {
 //
 //go:yeswritebarrierrec
 func goPanicSliceAlen(x int, y int) {
-	panicCheck1(getcallerpc(), "slice bounds out of range")
+	panicCheck1(sys.GetCallerPC(), "slice bounds out of range")
 	panic(boundsError{x: int64(x), signed: true, y: y, code: boundsSliceAlen})
 }
 
 //go:yeswritebarrierrec
 func goPanicSliceAlenU(x uint, y int) {
-	panicCheck1(getcallerpc(), "slice bounds out of range")
+	panicCheck1(sys.GetCallerPC(), "slice bounds out of range")
 	panic(boundsError{x: int64(x), signed: false, y: y, code: boundsSliceAlen})
 }
 
 //go:yeswritebarrierrec
 func goPanicSliceAcap(x int, y int) {
-	panicCheck1(getcallerpc(), "slice bounds out of range")
+	panicCheck1(sys.GetCallerPC(), "slice bounds out of range")
 	panic(boundsError{x: int64(x), signed: true, y: y, code: boundsSliceAcap})
 }
 
 //go:yeswritebarrierrec
 func goPanicSliceAcapU(x uint, y int) {
-	panicCheck1(getcallerpc(), "slice bounds out of range")
+	panicCheck1(sys.GetCallerPC(), "slice bounds out of range")
 	panic(boundsError{x: int64(x), signed: false, y: y, code: boundsSliceAcap})
 }
 
@@ -151,57 +151,57 @@ func goPanicSliceAcapU(x uint, y int) {
 //
 //go:yeswritebarrierrec
 func goPanicSliceB(x int, y int) {
-	panicCheck1(getcallerpc(), "slice bounds out of range")
+	panicCheck1(sys.GetCallerPC(), "slice bounds out of range")
 	panic(boundsError{x: int64(x), signed: true, y: y, code: boundsSliceB})
 }
 
 //go:yeswritebarrierrec
 func goPanicSliceBU(x uint, y int) {
-	panicCheck1(getcallerpc(), "slice bounds out of range")
+	panicCheck1(sys.GetCallerPC(), "slice bounds out of range")
 	panic(boundsError{x: int64(x), signed: false, y: y, code: boundsSliceB})
 }
 
 // failures in the comparisons for s[::x], 0 <= x <= y (y == len(s) or cap(s))
 func goPanicSlice3Alen(x int, y int) {
-	panicCheck1(getcallerpc(), "slice bounds out of range")
+	panicCheck1(sys.GetCallerPC(), "slice bounds out of range")
 	panic(boundsError{x: int64(x), signed: true, y: y, code: boundsSlice3Alen})
 }
 func goPanicSlice3AlenU(x uint, y int) {
-	panicCheck1(getcallerpc(), "slice bounds out of range")
+	panicCheck1(sys.GetCallerPC(), "slice bounds out of range")
 	panic(boundsError{x: int64(x), signed: false, y: y, code: boundsSlice3Alen})
 }
 func goPanicSlice3Acap(x int, y int) {
-	panicCheck1(getcallerpc(), "slice bounds out of range")
+	panicCheck1(sys.GetCallerPC(), "slice bounds out of range")
 	panic(boundsError{x: int64(x), signed: true, y: y, code: boundsSlice3Acap})
 }
 func goPanicSlice3AcapU(x uint, y int) {
-	panicCheck1(getcallerpc(), "slice bounds out of range")
+	panicCheck1(sys.GetCallerPC(), "slice bounds out of range")
 	panic(boundsError{x: int64(x), signed: false, y: y, code: boundsSlice3Acap})
 }
 
 // failures in the comparisons for s[:x:y], 0 <= x <= y
 func goPanicSlice3B(x int, y int) {
-	panicCheck1(getcallerpc(), "slice bounds out of range")
+	panicCheck1(sys.GetCallerPC(), "slice bounds out of range")
 	panic(boundsError{x: int64(x), signed: true, y: y, code: boundsSlice3B})
 }
 func goPanicSlice3BU(x uint, y int) {
-	panicCheck1(getcallerpc(), "slice bounds out of range")
+	panicCheck1(sys.GetCallerPC(), "slice bounds out of range")
 	panic(boundsError{x: int64(x), signed: false, y: y, code: boundsSlice3B})
 }
 
 // failures in the comparisons for s[x:y:], 0 <= x <= y
 func goPanicSlice3C(x int, y int) {
-	panicCheck1(getcallerpc(), "slice bounds out of range")
+	panicCheck1(sys.GetCallerPC(), "slice bounds out of range")
 	panic(boundsError{x: int64(x), signed: true, y: y, code: boundsSlice3C})
 }
 func goPanicSlice3CU(x uint, y int) {
-	panicCheck1(getcallerpc(), "slice bounds out of range")
+	panicCheck1(sys.GetCallerPC(), "slice bounds out of range")
 	panic(boundsError{x: int64(x), signed: false, y: y, code: boundsSlice3C})
 }
 
 // failures in the conversion ([x]T)(s) or (*[x]T)(s), 0 <= x <= y, y == len(s)
 func goPanicSliceConvert(x int, y int) {
-	panicCheck1(getcallerpc(), "slice length too short to convert to array or pointer to array")
+	panicCheck1(sys.GetCallerPC(), "slice length too short to convert to array or pointer to array")
 	panic(boundsError{x: int64(x), signed: true, y: y, code: boundsConvert})
 }
 
@@ -229,7 +229,7 @@ var shiftError = error(errorString("negative shift amount"))
 
 //go:yeswritebarrierrec
 func panicshift() {
-	panicCheck1(getcallerpc(), "negative shift amount")
+	panicCheck1(sys.GetCallerPC(), "negative shift amount")
 	panic(shiftError)
 }
 
@@ -280,11 +280,11 @@ func deferproc(fn func()) {
 	d.link = gp._defer
 	gp._defer = d
 	d.fn = fn
-	d.pc = getcallerpc()
-	// We must not be preempted between calling getcallersp and
-	// storing it to d.sp because getcallersp's result is a
+	d.pc = sys.GetCallerPC()
+	// We must not be preempted between calling GetCallerSP and
+	// storing it to d.sp because GetCallerSP's result is a
 	// uintptr stack pointer.
-	d.sp = getcallersp()
+	d.sp = sys.GetCallerSP()
 
 	// deferproc returns 0 normally.
 	// a deferred func that stops a panic
@@ -394,11 +394,11 @@ func deferrangefunc() any {
 	d := newdefer()
 	d.link = gp._defer
 	gp._defer = d
-	d.pc = getcallerpc()
-	// We must not be preempted between calling getcallersp and
-	// storing it to d.sp because getcallersp's result is a
+	d.pc = sys.GetCallerPC()
+	// We must not be preempted between calling GetCallerSP and
+	// storing it to d.sp because GetCallerSP's result is a
 	// uintptr stack pointer.
-	d.sp = getcallersp()
+	d.sp = sys.GetCallerSP()
 
 	d.rangefunc = true
 	d.head = new(atomic.Pointer[_defer])
@@ -416,7 +416,7 @@ func badDefer() *_defer {
 func deferprocat(fn func(), frame any) {
 	head := frame.(*atomic.Pointer[_defer])
 	if raceenabled {
-		racewritepc(unsafe.Pointer(head), getcallerpc(), abi.FuncPCABIInternal(deferprocat))
+		racewritepc(unsafe.Pointer(head), sys.GetCallerPC(), abi.FuncPCABIInternal(deferprocat))
 	}
 	d1 := newdefer()
 	d1.fn = fn
@@ -440,7 +440,7 @@ func deferprocat(fn func(), frame any) {
 func deferconvert(d0 *_defer) {
 	head := d0.head
 	if raceenabled {
-		racereadpc(unsafe.Pointer(head), getcallerpc(), abi.FuncPCABIInternal(deferconvert))
+		racereadpc(unsafe.Pointer(head), sys.GetCallerPC(), abi.FuncPCABIInternal(deferconvert))
 	}
 	tail := d0.link
 	d0.rangefunc = false
@@ -484,8 +484,8 @@ func deferprocStack(d *_defer) {
 	// are initialized here.
 	d.heap = false
 	d.rangefunc = false
-	d.sp = getcallersp()
-	d.pc = getcallerpc()
+	d.sp = sys.GetCallerSP()
+	d.pc = sys.GetCallerPC()
 	// The lines below implement:
 	//   d.panic = nil
 	//   d.fd = nil
@@ -596,7 +596,7 @@ func deferreturn() {
 	var p _panic
 	p.deferreturn = true
 
-	p.start(getcallerpc(), unsafe.Pointer(getcallersp()))
+	p.start(sys.GetCallerPC(), unsafe.Pointer(sys.GetCallerSP()))
 	for {
 		fn, ok := p.nextDefer()
 		if !ok {
@@ -614,13 +614,15 @@ func deferreturn() {
 // without func main returning. Since func main has not returned,
 // the program continues execution of other goroutines.
 // If all other goroutines exit, the program crashes.
+//
+// It crashes if called from a thread not created by the Go runtime.
 func Goexit() {
 	// Create a panic object for Goexit, so we can recognize when it might be
 	// bypassed by a recover().
 	var p _panic
 	p.goexit = true
 
-	p.start(getcallerpc(), unsafe.Pointer(getcallersp()))
+	p.start(sys.GetCallerPC(), unsafe.Pointer(sys.GetCallerSP()))
 	for {
 		fn, ok := p.nextDefer()
 		if !ok {
@@ -776,7 +778,7 @@ func gopanic(e any) {
 
 	runningPanicDefers.Add(1)
 
-	p.start(getcallerpc(), unsafe.Pointer(getcallersp()))
+	p.start(sys.GetCallerPC(), unsafe.Pointer(sys.GetCallerSP()))
 	for {
 		fn, ok := p.nextDefer()
 		if !ok {
@@ -815,8 +817,8 @@ func (p *_panic) start(pc uintptr, sp unsafe.Pointer) {
 	// that have been recovered. Also, so that if p is from Goexit, we
 	// can restart its defer processing loop if a recovered panic tries
 	// to jump past it.
-	p.startPC = getcallerpc()
-	p.startSP = unsafe.Pointer(getcallersp())
+	p.startPC = sys.GetCallerPC()
+	p.startSP = unsafe.Pointer(sys.GetCallerSP())
 
 	if p.deferreturn {
 		p.sp = sp
@@ -1031,14 +1033,41 @@ func sync_fatal(s string) {
 	fatal(s)
 }
 
+//go:linkname rand_fatal crypto/rand.fatal
+func rand_fatal(s string) {
+	fatal(s)
+}
+
+//go:linkname sysrand_fatal crypto/internal/sysrand.fatal
+func sysrand_fatal(s string) {
+	fatal(s)
+}
+
+//go:linkname fips_fatal crypto/internal/fips140.fatal
+func fips_fatal(s string) {
+	fatal(s)
+}
+
+//go:linkname maps_fatal internal/runtime/maps.fatal
+func maps_fatal(s string) {
+	fatal(s)
+}
+
+//go:linkname internal_sync_throw internal/sync.throw
+func internal_sync_throw(s string) {
+	throw(s)
+}
+
+//go:linkname internal_sync_fatal internal/sync.fatal
+func internal_sync_fatal(s string) {
+	fatal(s)
+}
+
 // throw triggers a fatal error that dumps a stack trace and exits.
 //
 // throw should be used for runtime-internal fatal errors where Go itself,
 // rather than user code, may be at fault for the failure.
 //
-// NOTE: temporarily marked "go:noinline" pending investigation/fix of
-// issue #67274, so as to fix longtest builders.
-//
 // throw should be an internal detail,
 // but widely used packages access it using linkname.
 // Notable members of the hall of shame include:
@@ -1079,6 +1108,7 @@ func throw(s string) {
 func fatal(s string) {
 	// Everything fatal does should be recursively nosplit so it
 	// can be called even when it's unsafe to grow the stack.
+	printlock() // Prevent multiple interleaved fatal reports. See issue 69447.
 	systemstack(func() {
 		print("fatal error: ")
 		printindented(s) // logically printpanicval(s), but avoids convTstring write barrier
@@ -1086,6 +1116,7 @@ func fatal(s string) {
 	})
 
 	fatalthrow(throwTypeUser)
+	printunlock()
 }
 
 // runningPanicDefers is non-zero while running deferred functions for panic.
@@ -1121,7 +1152,7 @@ func recovery(gp *g) {
 		// frames that we've already processed.
 		//
 		// There's a similar issue with nested panics, when the inner
-		// panic supercedes the outer panic. Again, we end up needing to
+		// panic supersedes the outer panic. Again, we end up needing to
 		// walk the same stack frames.
 		//
 		// These are probably pretty rare occurrences in practice, and
@@ -1225,8 +1256,8 @@ func recovery(gp *g) {
 //
 //go:nosplit
 func fatalthrow(t throwType) {
-	pc := getcallerpc()
-	sp := getcallersp()
+	pc := sys.GetCallerPC()
+	sp := sys.GetCallerSP()
 	gp := getg()
 
 	if gp.m.throwing == throwTypeNone {
@@ -1261,8 +1292,8 @@ func fatalthrow(t throwType) {
 //
 //go:nosplit
 func fatalpanic(msgs *_panic) {
-	pc := getcallerpc()
-	sp := getcallersp()
+	pc := sys.GetCallerPC()
+	sp := sys.GetCallerSP()
 	gp := getg()
 	var docrash bool
 	// Switch to the system stack to avoid any stack growth, which
diff --git a/src/runtime/panic32.go b/src/runtime/panic32.go
index fa3f2bf2..cd34485a 100644
--- a/src/runtime/panic32.go
+++ b/src/runtime/panic32.go
@@ -6,82 +6,86 @@
 
 package runtime
 
+import (
+	"internal/runtime/sys"
+)
+
 // Additional index/slice error paths for 32-bit platforms.
 // Used when the high word of a 64-bit index is not zero.
 
 // failures in the comparisons for s[x], 0 <= x < y (y == len(s))
 func goPanicExtendIndex(hi int, lo uint, y int) {
-	panicCheck1(getcallerpc(), "index out of range")
+	panicCheck1(sys.GetCallerPC(), "index out of range")
 	panic(boundsError{x: int64(hi)<<32 + int64(lo), signed: true, y: y, code: boundsIndex})
 }
 func goPanicExtendIndexU(hi uint, lo uint, y int) {
-	panicCheck1(getcallerpc(), "index out of range")
+	panicCheck1(sys.GetCallerPC(), "index out of range")
 	panic(boundsError{x: int64(hi)<<32 + int64(lo), signed: false, y: y, code: boundsIndex})
 }
 
 // failures in the comparisons for s[:x], 0 <= x <= y (y == len(s) or cap(s))
 func goPanicExtendSliceAlen(hi int, lo uint, y int) {
-	panicCheck1(getcallerpc(), "slice bounds out of range")
+	panicCheck1(sys.GetCallerPC(), "slice bounds out of range")
 	panic(boundsError{x: int64(hi)<<32 + int64(lo), signed: true, y: y, code: boundsSliceAlen})
 }
 func goPanicExtendSliceAlenU(hi uint, lo uint, y int) {
-	panicCheck1(getcallerpc(), "slice bounds out of range")
+	panicCheck1(sys.GetCallerPC(), "slice bounds out of range")
 	panic(boundsError{x: int64(hi)<<32 + int64(lo), signed: false, y: y, code: boundsSliceAlen})
 }
 func goPanicExtendSliceAcap(hi int, lo uint, y int) {
-	panicCheck1(getcallerpc(), "slice bounds out of range")
+	panicCheck1(sys.GetCallerPC(), "slice bounds out of range")
 	panic(boundsError{x: int64(hi)<<32 + int64(lo), signed: true, y: y, code: boundsSliceAcap})
 }
 func goPanicExtendSliceAcapU(hi uint, lo uint, y int) {
-	panicCheck1(getcallerpc(), "slice bounds out of range")
+	panicCheck1(sys.GetCallerPC(), "slice bounds out of range")
 	panic(boundsError{x: int64(hi)<<32 + int64(lo), signed: false, y: y, code: boundsSliceAcap})
 }
 
 // failures in the comparisons for s[x:y], 0 <= x <= y
 func goPanicExtendSliceB(hi int, lo uint, y int) {
-	panicCheck1(getcallerpc(), "slice bounds out of range")
+	panicCheck1(sys.GetCallerPC(), "slice bounds out of range")
 	panic(boundsError{x: int64(hi)<<32 + int64(lo), signed: true, y: y, code: boundsSliceB})
 }
 func goPanicExtendSliceBU(hi uint, lo uint, y int) {
-	panicCheck1(getcallerpc(), "slice bounds out of range")
+	panicCheck1(sys.GetCallerPC(), "slice bounds out of range")
 	panic(boundsError{x: int64(hi)<<32 + int64(lo), signed: false, y: y, code: boundsSliceB})
 }
 
 // failures in the comparisons for s[::x], 0 <= x <= y (y == len(s) or cap(s))
 func goPanicExtendSlice3Alen(hi int, lo uint, y int) {
-	panicCheck1(getcallerpc(), "slice bounds out of range")
+	panicCheck1(sys.GetCallerPC(), "slice bounds out of range")
 	panic(boundsError{x: int64(hi)<<32 + int64(lo), signed: true, y: y, code: boundsSlice3Alen})
 }
 func goPanicExtendSlice3AlenU(hi uint, lo uint, y int) {
-	panicCheck1(getcallerpc(), "slice bounds out of range")
+	panicCheck1(sys.GetCallerPC(), "slice bounds out of range")
 	panic(boundsError{x: int64(hi)<<32 + int64(lo), signed: false, y: y, code: boundsSlice3Alen})
 }
 func goPanicExtendSlice3Acap(hi int, lo uint, y int) {
-	panicCheck1(getcallerpc(), "slice bounds out of range")
+	panicCheck1(sys.GetCallerPC(), "slice bounds out of range")
 	panic(boundsError{x: int64(hi)<<32 + int64(lo), signed: true, y: y, code: boundsSlice3Acap})
 }
 func goPanicExtendSlice3AcapU(hi uint, lo uint, y int) {
-	panicCheck1(getcallerpc(), "slice bounds out of range")
+	panicCheck1(sys.GetCallerPC(), "slice bounds out of range")
 	panic(boundsError{x: int64(hi)<<32 + int64(lo), signed: false, y: y, code: boundsSlice3Acap})
 }
 
 // failures in the comparisons for s[:x:y], 0 <= x <= y
 func goPanicExtendSlice3B(hi int, lo uint, y int) {
-	panicCheck1(getcallerpc(), "slice bounds out of range")
+	panicCheck1(sys.GetCallerPC(), "slice bounds out of range")
 	panic(boundsError{x: int64(hi)<<32 + int64(lo), signed: true, y: y, code: boundsSlice3B})
 }
 func goPanicExtendSlice3BU(hi uint, lo uint, y int) {
-	panicCheck1(getcallerpc(), "slice bounds out of range")
+	panicCheck1(sys.GetCallerPC(), "slice bounds out of range")
 	panic(boundsError{x: int64(hi)<<32 + int64(lo), signed: false, y: y, code: boundsSlice3B})
 }
 
 // failures in the comparisons for s[x:y:], 0 <= x <= y
 func goPanicExtendSlice3C(hi int, lo uint, y int) {
-	panicCheck1(getcallerpc(), "slice bounds out of range")
+	panicCheck1(sys.GetCallerPC(), "slice bounds out of range")
 	panic(boundsError{x: int64(hi)<<32 + int64(lo), signed: true, y: y, code: boundsSlice3C})
 }
 func goPanicExtendSlice3CU(hi uint, lo uint, y int) {
-	panicCheck1(getcallerpc(), "slice bounds out of range")
+	panicCheck1(sys.GetCallerPC(), "slice bounds out of range")
 	panic(boundsError{x: int64(hi)<<32 + int64(lo), signed: false, y: y, code: boundsSlice3C})
 }
 
diff --git a/src/runtime/pinner.go b/src/runtime/pinner.go
index 7a9c3815..543bfdb7 100644
--- a/src/runtime/pinner.go
+++ b/src/runtime/pinner.go
@@ -331,7 +331,7 @@ func (span *mspan) incPinCounter(offset uintptr) {
 		rec = (*specialPinCounter)(mheap_.specialPinCounterAlloc.alloc())
 		unlock(&mheap_.speciallock)
 		// splice in record, fill in offset.
-		rec.special.offset = uint16(offset)
+		rec.special.offset = offset
 		rec.special.kind = _KindSpecialPinCounter
 		rec.special.next = *ref
 		*ref = (*special)(unsafe.Pointer(rec))
diff --git a/src/runtime/pprof/label.go b/src/runtime/pprof/label.go
index 41eece2f..4c1d8d38 100644
--- a/src/runtime/pprof/label.go
+++ b/src/runtime/pprof/label.go
@@ -27,7 +27,7 @@ type labelContextKey struct{}
 func labelValue(ctx context.Context) labelMap {
 	labels, _ := ctx.Value(labelContextKey{}).(*labelMap)
 	if labels == nil {
-		return labelMap(nil)
+		return labelMap{}
 	}
 	return *labels
 }
@@ -35,7 +35,9 @@ func labelValue(ctx context.Context) labelMap {
 // labelMap is the representation of the label set held in the context type.
 // This is an initial implementation, but it will be replaced with something
 // that admits incremental immutable modification more efficiently.
-type labelMap map[string]string
+type labelMap struct {
+	LabelSet
+}
 
 // String satisfies Stringer and returns key, value pairs in a consistent
 // order.
@@ -43,14 +45,13 @@ func (l *labelMap) String() string {
 	if l == nil {
 		return ""
 	}
-	keyVals := make([]string, 0, len(*l))
+	keyVals := make([]string, 0, len(l.list))
 
-	for k, v := range *l {
-		keyVals = append(keyVals, fmt.Sprintf("%q:%q", k, v))
+	for _, lbl := range l.list {
+		keyVals = append(keyVals, fmt.Sprintf("%q:%q", lbl.key, lbl.value))
 	}
 
 	slices.Sort(keyVals)
-
 	return "{" + strings.Join(keyVals, ", ") + "}"
 }
 
@@ -58,17 +59,38 @@ func (l *labelMap) String() string {
 // A label overwrites a prior label with the same key.
 func WithLabels(ctx context.Context, labels LabelSet) context.Context {
 	parentLabels := labelValue(ctx)
-	childLabels := make(labelMap, len(parentLabels))
-	// TODO(matloob): replace the map implementation with something
-	// more efficient so creating a child context WithLabels doesn't need
-	// to clone the map.
-	for k, v := range parentLabels {
-		childLabels[k] = v
+	return context.WithValue(ctx, labelContextKey{}, &labelMap{mergeLabelSets(parentLabels.LabelSet, labels)})
+}
+
+func mergeLabelSets(left, right LabelSet) LabelSet {
+	if len(left.list) == 0 {
+		return right
+	} else if len(right.list) == 0 {
+		return left
 	}
-	for _, label := range labels.list {
-		childLabels[label.key] = label.value
+
+	l, r := 0, 0
+	result := make([]label, 0, len(right.list))
+	for l < len(left.list) && r < len(right.list) {
+		switch strings.Compare(left.list[l].key, right.list[r].key) {
+		case -1: // left key < right key
+			result = append(result, left.list[l])
+			l++
+		case 1: // right key < left key
+			result = append(result, right.list[r])
+			r++
+		case 0: // keys are equal, right value overwrites left value
+			result = append(result, right.list[r])
+			l++
+			r++
+		}
 	}
-	return context.WithValue(ctx, labelContextKey{}, &childLabels)
+
+	// Append the remaining elements
+	result = append(result, left.list[l:]...)
+	result = append(result, right.list[r:]...)
+
+	return LabelSet{list: result}
 }
 
 // Labels takes an even number of strings representing key-value pairs
@@ -82,8 +104,25 @@ func Labels(args ...string) LabelSet {
 		panic("uneven number of arguments to pprof.Labels")
 	}
 	list := make([]label, 0, len(args)/2)
+	sortedNoDupes := true
 	for i := 0; i+1 < len(args); i += 2 {
 		list = append(list, label{key: args[i], value: args[i+1]})
+		sortedNoDupes = sortedNoDupes && (i < 2 || args[i] > args[i-2])
+	}
+	if !sortedNoDupes {
+		// slow path: keys are unsorted, contain duplicates, or both
+		slices.SortStableFunc(list, func(a, b label) int {
+			return strings.Compare(a.key, b.key)
+		})
+		deduped := make([]label, 0, len(list))
+		for i, lbl := range list {
+			if i == 0 || lbl.key != list[i-1].key {
+				deduped = append(deduped, lbl)
+			} else {
+				deduped[len(deduped)-1] = lbl
+			}
+		}
+		list = deduped
 	}
 	return LabelSet{list: list}
 }
@@ -92,16 +131,20 @@ func Labels(args ...string) LabelSet {
 // whether that label exists.
 func Label(ctx context.Context, key string) (string, bool) {
 	ctxLabels := labelValue(ctx)
-	v, ok := ctxLabels[key]
-	return v, ok
+	for _, lbl := range ctxLabels.list {
+		if lbl.key == key {
+			return lbl.value, true
+		}
+	}
+	return "", false
 }
 
 // ForLabels invokes f with each label set on the context.
 // The function f should return true to continue iteration or false to stop iteration early.
 func ForLabels(ctx context.Context, f func(key, value string) bool) {
 	ctxLabels := labelValue(ctx)
-	for k, v := range ctxLabels {
-		if !f(k, v) {
+	for _, lbl := range ctxLabels.list {
+		if !f(lbl.key, lbl.value) {
 			break
 		}
 	}
diff --git a/src/runtime/pprof/label_test.go b/src/runtime/pprof/label_test.go
index cefd9a53..3018693c 100644
--- a/src/runtime/pprof/label_test.go
+++ b/src/runtime/pprof/label_test.go
@@ -6,8 +6,10 @@ package pprof
 
 import (
 	"context"
+	"fmt"
 	"reflect"
-	"sort"
+	"slices"
+	"strings"
 	"testing"
 )
 
@@ -17,16 +19,10 @@ func labelsSorted(ctx context.Context) []label {
 		ls = append(ls, label{key, value})
 		return true
 	})
-	sort.Sort(labelSorter(ls))
+	slices.SortFunc(ls, func(a, b label) int { return strings.Compare(a.key, b.key) })
 	return ls
 }
 
-type labelSorter []label
-
-func (s labelSorter) Len() int           { return len(s) }
-func (s labelSorter) Swap(i, j int)      { s[i], s[j] = s[j], s[i] }
-func (s labelSorter) Less(i, j int) bool { return s[i].key < s[j].key }
-
 func TestContextLabels(t *testing.T) {
 	// Background context starts with no labels.
 	ctx := context.Background()
@@ -97,16 +93,18 @@ func TestLabelMapStringer(t *testing.T) {
 			expected: "{}",
 		}, {
 			m: labelMap{
-				"foo": "bar",
+				Labels("foo", "bar"),
 			},
 			expected: `{"foo":"bar"}`,
 		}, {
 			m: labelMap{
-				"foo":             "bar",
-				"key1":            "value1",
-				"key2":            "value2",
-				"key3":            "value3",
-				"key4WithNewline": "\nvalue4",
+				Labels(
+					"foo", "bar",
+					"key1", "value1",
+					"key2", "value2",
+					"key3", "value3",
+					"key4WithNewline", "\nvalue4",
+				),
 			},
 			expected: `{"foo":"bar", "key1":"value1", "key2":"value2", "key3":"value3", "key4WithNewline":"\nvalue4"}`,
 		},
@@ -116,3 +114,75 @@ func TestLabelMapStringer(t *testing.T) {
 		}
 	}
 }
+
+func BenchmarkLabels(b *testing.B) {
+	b.Run("set-one", func(b *testing.B) {
+		b.ReportAllocs()
+		b.ResetTimer()
+		for i := 0; i < b.N; i++ {
+			Do(context.Background(), Labels("key", "value"), func(context.Context) {})
+		}
+	})
+
+	b.Run("merge-one", func(b *testing.B) {
+		ctx := WithLabels(context.Background(), Labels("key1", "val1"))
+
+		b.ReportAllocs()
+		b.ResetTimer()
+		for i := 0; i < b.N; i++ {
+			Do(ctx, Labels("key2", "value2"), func(context.Context) {})
+		}
+	})
+
+	b.Run("overwrite-one", func(b *testing.B) {
+		ctx := WithLabels(context.Background(), Labels("key", "val"))
+
+		b.ReportAllocs()
+		b.ResetTimer()
+		for i := 0; i < b.N; i++ {
+			Do(ctx, Labels("key", "value"), func(context.Context) {})
+		}
+	})
+
+	for _, scenario := range []string{"ordered", "unordered"} {
+		var labels []string
+		for i := 0; i < 10; i++ {
+			labels = append(labels, fmt.Sprintf("key%03d", i), fmt.Sprintf("value%03d", i))
+		}
+		if scenario == "unordered" {
+			labels[0], labels[len(labels)-1] = labels[len(labels)-1], labels[0]
+		}
+
+		b.Run(scenario, func(b *testing.B) {
+			b.Run("set-many", func(b *testing.B) {
+				b.ReportAllocs()
+				b.ResetTimer()
+				for i := 0; i < b.N; i++ {
+					Do(context.Background(), Labels(labels...), func(context.Context) {})
+				}
+			})
+
+			b.Run("merge-many", func(b *testing.B) {
+				ctx := WithLabels(context.Background(), Labels(labels[:len(labels)/2]...))
+
+				b.ResetTimer()
+				b.ReportAllocs()
+				for i := 0; i < b.N; i++ {
+					Do(ctx, Labels(labels[len(labels)/2:]...), func(context.Context) {})
+				}
+			})
+
+			b.Run("overwrite-many", func(b *testing.B) {
+				ctx := WithLabels(context.Background(), Labels(labels...))
+
+				b.ReportAllocs()
+				b.ResetTimer()
+				for i := 0; i < b.N; i++ {
+					Do(ctx, Labels(labels...), func(context.Context) {})
+				}
+			})
+		})
+	}
+
+	// TODO: hit slow path in Labels
+}
diff --git a/src/runtime/pprof/mprof_test.go b/src/runtime/pprof/mprof_test.go
index ef373b36..7c4a37e3 100644
--- a/src/runtime/pprof/mprof_test.go
+++ b/src/runtime/pprof/mprof_test.go
@@ -9,6 +9,7 @@ package pprof
 import (
 	"bytes"
 	"fmt"
+	"internal/asan"
 	"internal/profile"
 	"reflect"
 	"regexp"
@@ -63,6 +64,10 @@ func allocateReflect() {
 var memoryProfilerRun = 0
 
 func TestMemoryProfiler(t *testing.T) {
+	if asan.Enabled {
+		t.Skip("extra allocations with -asan throw off the test; see #70079")
+	}
+
 	// Disable sampling, otherwise it's difficult to assert anything.
 	oldRate := runtime.MemProfileRate
 	runtime.MemProfileRate = 1
@@ -93,31 +98,31 @@ func TestMemoryProfiler(t *testing.T) {
 	}{{
 		stk: []string{"runtime/pprof.allocatePersistent1K", "runtime/pprof.TestMemoryProfiler"},
 		legacy: fmt.Sprintf(`%v: %v \[%v: %v\] @ 0x[0-9,a-f]+ 0x[0-9,a-f]+ 0x[0-9,a-f]+ 0x[0-9,a-f]+
-#	0x[0-9,a-f]+	runtime/pprof\.allocatePersistent1K\+0x[0-9,a-f]+	.*runtime/pprof/mprof_test\.go:47
-#	0x[0-9,a-f]+	runtime/pprof\.TestMemoryProfiler\+0x[0-9,a-f]+	.*runtime/pprof/mprof_test\.go:82
+#	0x[0-9,a-f]+	runtime/pprof\.allocatePersistent1K\+0x[0-9,a-f]+	.*runtime/pprof/mprof_test\.go:48
+#	0x[0-9,a-f]+	runtime/pprof\.TestMemoryProfiler\+0x[0-9,a-f]+	.*runtime/pprof/mprof_test\.go:87
 `, 32*memoryProfilerRun, 1024*memoryProfilerRun, 32*memoryProfilerRun, 1024*memoryProfilerRun),
 	}, {
 		stk: []string{"runtime/pprof.allocateTransient1M", "runtime/pprof.TestMemoryProfiler"},
 		legacy: fmt.Sprintf(`0: 0 \[%v: %v\] @ 0x[0-9,a-f]+ 0x[0-9,a-f]+ 0x[0-9,a-f]+ 0x[0-9,a-f]+
-#	0x[0-9,a-f]+	runtime/pprof\.allocateTransient1M\+0x[0-9,a-f]+	.*runtime/pprof/mprof_test.go:24
-#	0x[0-9,a-f]+	runtime/pprof\.TestMemoryProfiler\+0x[0-9,a-f]+	.*runtime/pprof/mprof_test.go:79
+#	0x[0-9,a-f]+	runtime/pprof\.allocateTransient1M\+0x[0-9,a-f]+	.*runtime/pprof/mprof_test.go:25
+#	0x[0-9,a-f]+	runtime/pprof\.TestMemoryProfiler\+0x[0-9,a-f]+	.*runtime/pprof/mprof_test.go:84
 `, (1<<10)*memoryProfilerRun, (1<<20)*memoryProfilerRun),
 	}, {
 		stk: []string{"runtime/pprof.allocateTransient2M", "runtime/pprof.TestMemoryProfiler"},
 		legacy: fmt.Sprintf(`0: 0 \[%v: %v\] @ 0x[0-9,a-f]+ 0x[0-9,a-f]+ 0x[0-9,a-f]+ 0x[0-9,a-f]+
-#	0x[0-9,a-f]+	runtime/pprof\.allocateTransient2M\+0x[0-9,a-f]+	.*runtime/pprof/mprof_test.go:30
-#	0x[0-9,a-f]+	runtime/pprof\.TestMemoryProfiler\+0x[0-9,a-f]+	.*runtime/pprof/mprof_test.go:80
+#	0x[0-9,a-f]+	runtime/pprof\.allocateTransient2M\+0x[0-9,a-f]+	.*runtime/pprof/mprof_test.go:31
+#	0x[0-9,a-f]+	runtime/pprof\.TestMemoryProfiler\+0x[0-9,a-f]+	.*runtime/pprof/mprof_test.go:85
 `, memoryProfilerRun, (2<<20)*memoryProfilerRun),
 	}, {
 		stk: []string{"runtime/pprof.allocateTransient2MInline", "runtime/pprof.TestMemoryProfiler"},
 		legacy: fmt.Sprintf(`0: 0 \[%v: %v\] @ 0x[0-9,a-f]+ 0x[0-9,a-f]+ 0x[0-9,a-f]+ 0x[0-9,a-f]+
-#	0x[0-9,a-f]+	runtime/pprof\.allocateTransient2MInline\+0x[0-9,a-f]+	.*runtime/pprof/mprof_test.go:34
-#	0x[0-9,a-f]+	runtime/pprof\.TestMemoryProfiler\+0x[0-9,a-f]+	.*runtime/pprof/mprof_test.go:81
+#	0x[0-9,a-f]+	runtime/pprof\.allocateTransient2MInline\+0x[0-9,a-f]+	.*runtime/pprof/mprof_test.go:35
+#	0x[0-9,a-f]+	runtime/pprof\.TestMemoryProfiler\+0x[0-9,a-f]+	.*runtime/pprof/mprof_test.go:86
 `, memoryProfilerRun, (2<<20)*memoryProfilerRun),
 	}, {
 		stk: []string{"runtime/pprof.allocateReflectTransient"},
 		legacy: fmt.Sprintf(`0: 0 \[%v: %v\] @( 0x[0-9,a-f]+)+
-#	0x[0-9,a-f]+	runtime/pprof\.allocateReflectTransient\+0x[0-9,a-f]+	.*runtime/pprof/mprof_test.go:55
+#	0x[0-9,a-f]+	runtime/pprof\.allocateReflectTransient\+0x[0-9,a-f]+	.*runtime/pprof/mprof_test.go:56
 `, memoryProfilerRun, (2<<20)*memoryProfilerRun),
 	}}
 
diff --git a/src/runtime/pprof/pprof.go b/src/runtime/pprof/pprof.go
index 4b7a9f63..b7680a13 100644
--- a/src/runtime/pprof/pprof.go
+++ b/src/runtime/pprof/pprof.go
@@ -44,7 +44,10 @@
 //	        }
 //	        defer f.Close() // error handling omitted for example
 //	        runtime.GC() // get up-to-date statistics
-//	        if err := pprof.WriteHeapProfile(f); err != nil {
+//	        // Lookup("allocs") creates a profile similar to go test -memprofile.
+//	        // Alternatively, use Lookup("heap") for a profile
+//	        // that has inuse_space as the default index.
+//	        if err := pprof.Lookup("allocs").WriteTo(f, 0); err != nil {
 //	            log.Fatal("could not write memory profile: ", err)
 //	        }
 //	    }
@@ -513,8 +516,8 @@ func printCountProfile(w io.Writer, debug int, name string, p countProfile) erro
 		var labels func()
 		if p.Label(idx) != nil {
 			labels = func() {
-				for k, v := range *p.Label(idx) {
-					b.pbLabel(tagSample_Label, k, v, 0)
+				for _, lbl := range p.Label(idx).list {
+					b.pbLabel(tagSample_Label, lbl.key, lbl.value, 0)
 				}
 			}
 		}
@@ -552,7 +555,7 @@ func printStackRecord(w io.Writer, stk []uintptr, allFrames bool) {
 		if name == "" {
 			show = true
 			fmt.Fprintf(w, "#\t%#x\n", frame.PC)
-		} else if name != "runtime.goexit" && (show || !strings.HasPrefix(name, "runtime.")) {
+		} else if name != "runtime.goexit" && (show || !(strings.HasPrefix(name, "runtime.") || strings.HasPrefix(name, "internal/runtime/"))) {
 			// Hide runtime.goexit and any runtime functions at the beginning.
 			// This is useful mainly for allocation traces.
 			show = true
diff --git a/src/runtime/pprof/pprof_test.go b/src/runtime/pprof/pprof_test.go
index da4ad17d..bba66ba4 100644
--- a/src/runtime/pprof/pprof_test.go
+++ b/src/runtime/pprof/pprof_test.go
@@ -22,6 +22,7 @@ import (
 	"regexp"
 	"runtime"
 	"runtime/debug"
+	"slices"
 	"strconv"
 	"strings"
 	"sync"
@@ -521,15 +522,6 @@ func diffCPUTime(t *testing.T, f func()) (user, system time.Duration) {
 	return 0, 0
 }
 
-func contains(slice []string, s string) bool {
-	for i := range slice {
-		if slice[i] == s {
-			return true
-		}
-	}
-	return false
-}
-
 // stackContains matches if a function named spec appears anywhere in the stack trace.
 func stackContains(spec string, count uintptr, stk []*profile.Location, labels map[string][]string) bool {
 	for _, loc := range stk {
@@ -1237,7 +1229,7 @@ func blockFrequentShort(rate int) {
 	}
 }
 
-// blockFrequentShort produces 10000 block events with an average duration of
+// blockInfrequentLong produces 10000 block events with an average duration of
 // rate.
 func blockInfrequentLong(rate int) {
 	for i := 0; i < 10000; i++ {
@@ -1410,7 +1402,7 @@ func TestMutexProfileRateAdjust(t *testing.T) {
 
 	blockMutex(t)
 	contentions, delay := readProfile()
-	if contentions == 0 || delay == 0 {
+	if contentions == 0 { // low-resolution timers can have delay of 0 in mutex profile
 		t.Fatal("did not see expected function in profile")
 	}
 	runtime.SetMutexProfileFraction(0)
@@ -1490,11 +1482,11 @@ func TestGoroutineCounts(t *testing.T) {
 	goroutineProf.WriteTo(&w, 1)
 	prof := w.String()
 
-	labels := labelMap{"label": "value"}
+	labels := labelMap{Labels("label", "value")}
 	labelStr := "\n# labels: " + labels.String()
-	selfLabel := labelMap{"self-label": "self-value"}
+	selfLabel := labelMap{Labels("self-label", "self-value")}
 	selfLabelStr := "\n# labels: " + selfLabel.String()
-	fingLabel := labelMap{"fing-label": "fing-value"}
+	fingLabel := labelMap{Labels("fing-label", "fing-value")}
 	fingLabelStr := "\n# labels: " + fingLabel.String()
 	orderedPrefix := []string{
 		"\n50 @ ",
@@ -1960,7 +1952,7 @@ func stackContainsLabeled(spec string, count uintptr, stk []*profile.Location, l
 	if !ok {
 		panic("missing = in key/value spec")
 	}
-	if !contains(labels[k], v) {
+	if !slices.Contains(labels[k], v) {
 		return false
 	}
 	return stackContains(base, count, stk, labels)
@@ -2077,7 +2069,7 @@ func TestLabelSystemstack(t *testing.T) {
 	// * labelHog should always be labeled.
 	// * The label should _only_ appear on labelHog and the Do call above.
 	for _, s := range p.Sample {
-		isLabeled := s.Label != nil && contains(s.Label["key"], "value")
+		isLabeled := s.Label != nil && slices.Contains(s.Label["key"], "value")
 		var (
 			mayBeLabeled     bool
 			mustBeLabeled    string
@@ -2553,19 +2545,34 @@ func TestProfilerStackDepth(t *testing.T) {
 			t.Logf("Profile = %v", p)
 
 			stks := profileStacks(p)
-			var stk []string
-			for _, s := range stks {
-				if hasPrefix(s, test.prefix) {
-					stk = s
-					break
+			var matchedStacks [][]string
+			for _, stk := range stks {
+				if !hasPrefix(stk, test.prefix) {
+					continue
 				}
+				// We may get multiple stacks which contain the prefix we want, but
+				// which might not have enough frames, e.g. if the profiler hides
+				// some leaf frames that would count against the stack depth limit.
+				// Check for at least one match
+				matchedStacks = append(matchedStacks, stk)
+				if len(stk) != depth {
+					continue
+				}
+				if rootFn, wantFn := stk[depth-1], "runtime/pprof.produceProfileEvents"; rootFn != wantFn {
+					continue
+				}
+				// Found what we wanted
+				return
 			}
-			if len(stk) != depth {
-				t.Fatalf("want stack depth = %d, got %d", depth, len(stk))
-			}
+			for _, stk := range matchedStacks {
+				t.Logf("matched stack=%s", stk)
+				if len(stk) != depth {
+					t.Errorf("want stack depth = %d, got %d", depth, len(stk))
+				}
 
-			if rootFn, wantFn := stk[depth-1], "runtime/pprof.produceProfileEvents"; rootFn != wantFn {
-				t.Fatalf("want stack stack root %s, got %v", wantFn, rootFn)
+				if rootFn, wantFn := stk[depth-1], "runtime/pprof.produceProfileEvents"; rootFn != wantFn {
+					t.Errorf("want stack stack root %s, got %v", wantFn, rootFn)
+				}
 			}
 		})
 	}
diff --git a/src/runtime/pprof/proto.go b/src/runtime/pprof/proto.go
index 5214374b..a664fdc6 100644
--- a/src/runtime/pprof/proto.go
+++ b/src/runtime/pprof/proto.go
@@ -367,8 +367,8 @@ func (b *profileBuilder) build() {
 		var labels func()
 		if e.tag != nil {
 			labels = func() {
-				for k, v := range *(*labelMap)(e.tag) {
-					b.pbLabel(tagSample_Label, k, v, 0)
+				for _, lbl := range (*labelMap)(e.tag).list {
+					b.pbLabel(tagSample_Label, lbl.key, lbl.value, 0)
 				}
 			}
 		}
@@ -404,6 +404,7 @@ func (b *profileBuilder) appendLocsForStack(locs []uint64, stk []uintptr) (newLo
 	b.deck.reset()
 
 	// The last frame might be truncated. Recover lost inline frames.
+	origStk := stk
 	stk = runtime_expandFinalInlineFrame(stk)
 
 	for len(stk) > 0 {
@@ -440,6 +441,9 @@ func (b *profileBuilder) appendLocsForStack(locs []uint64, stk []uintptr) (newLo
 			// Even if stk was truncated due to the stack depth
 			// limit, expandFinalInlineFrame above has already
 			// fixed the truncation, ensuring it is long enough.
+			if len(l.pcs) > len(stk) {
+				panic(fmt.Sprintf("stack too short to match cached location; stk = %#x, l.pcs = %#x, original stk = %#x", stk, l.pcs, origStk))
+			}
 			stk = stk[len(l.pcs):]
 			continue
 		}
diff --git a/src/runtime/pprof/protomem.go b/src/runtime/pprof/protomem.go
index ab3550f4..72aad82b 100644
--- a/src/runtime/pprof/protomem.go
+++ b/src/runtime/pprof/protomem.go
@@ -36,7 +36,7 @@ func writeHeapProto(w io.Writer, p []profilerecord.MemProfileRecord, rate int64,
 			// what appendLocsForStack expects.
 			if hideRuntime {
 				for i, addr := range stk {
-					if f := runtime.FuncForPC(addr); f != nil && strings.HasPrefix(f.Name(), "runtime.") {
+					if f := runtime.FuncForPC(addr); f != nil && (strings.HasPrefix(f.Name(), "runtime.") || strings.HasPrefix(f.Name(), "internal/runtime/")) {
 						continue
 					}
 					// Found non-runtime. Show any runtime uses above it.
diff --git a/src/runtime/pprof/protomem_test.go b/src/runtime/pprof/protomem_test.go
index 8e9732a3..4d08e67d 100644
--- a/src/runtime/pprof/protomem_test.go
+++ b/src/runtime/pprof/protomem_test.go
@@ -7,6 +7,7 @@ package pprof
 import (
 	"bytes"
 	"fmt"
+	"internal/asan"
 	"internal/profile"
 	"internal/profilerecord"
 	"internal/testenv"
@@ -117,8 +118,11 @@ func locationToStrings(loc *profile.Location, funcs []string) []string {
 	return funcs
 }
 
-// This is a regression test for https://go.dev/issue/64528 .
+// This is a regression test for https://go.dev/issue/64528.
 func TestGenericsHashKeyInPprofBuilder(t *testing.T) {
+	if asan.Enabled {
+		t.Skip("extra allocations with -asan throw off the test; see #70079")
+	}
 	previousRate := runtime.MemProfileRate
 	runtime.MemProfileRate = 1
 	defer func() {
@@ -178,6 +182,9 @@ func nonRecursiveGenericAllocFunction[CurrentOp any, OtherOp any](alloc bool) {
 }
 
 func TestGenericsInlineLocations(t *testing.T) {
+	if asan.Enabled {
+		t.Skip("extra allocations with -asan throw off the test; see #70079")
+	}
 	if testenv.OptimizationOff() {
 		t.Skip("skipping test with optimizations disabled")
 	}
@@ -222,3 +229,61 @@ func TestGenericsInlineLocations(t *testing.T) {
 		t.Errorf("expected a location with at least 3 functions\n%s\ngot\n%s\n", expectedLocation, actual)
 	}
 }
+
+func growMap() {
+	m := make(map[int]int)
+	for i := range 512 {
+		m[i] = i
+	}
+}
+
+// Runtime frames are hidden in heap profiles.
+// This is a regression test for https://go.dev/issue/71174.
+func TestHeapRuntimeFrames(t *testing.T) {
+	previousRate := runtime.MemProfileRate
+	runtime.MemProfileRate = 1
+	defer func() {
+		runtime.MemProfileRate = previousRate
+	}()
+
+	growMap()
+
+	runtime.GC()
+	buf := bytes.NewBuffer(nil)
+	if err := WriteHeapProfile(buf); err != nil {
+		t.Fatalf("writing profile: %v", err)
+	}
+	p, err := profile.Parse(buf)
+	if err != nil {
+		t.Fatalf("profile.Parse: %v", err)
+	}
+
+	actual := profileToStrings(p)
+
+	// We must see growMap at least once.
+	foundGrowMap := false
+	for _, l := range actual {
+		if !strings.Contains(l, "runtime/pprof.growMap") {
+			continue
+		}
+		foundGrowMap = true
+
+		// Runtime frames like mapassign and map internals should be hidden.
+		if strings.Contains(l, "runtime.") {
+			t.Errorf("Sample got %s, want no runtime frames", l)
+		}
+		if strings.Contains(l, "internal/runtime/") {
+			t.Errorf("Sample got %s, want no runtime frames", l)
+		}
+		if strings.Contains(l, "runtime/internal/") {
+			t.Errorf("Sample got %s, want no runtime frames", l)
+		}
+		if strings.Contains(l, "mapassign") { // in case mapassign moves to a package not matching above paths.
+			t.Errorf("Sample got %s, want no mapassign frames", l)
+		}
+	}
+
+	if !foundGrowMap {
+		t.Errorf("Profile got:\n%s\nwant sample in runtime/pprof.growMap", strings.Join(actual, "\n"))
+	}
+}
diff --git a/src/runtime/pprof/runtime_test.go b/src/runtime/pprof/runtime_test.go
index 0dd5324b..353ed8a3 100644
--- a/src/runtime/pprof/runtime_test.go
+++ b/src/runtime/pprof/runtime_test.go
@@ -7,7 +7,7 @@ package pprof
 import (
 	"context"
 	"fmt"
-	"reflect"
+	"maps"
 	"testing"
 )
 
@@ -15,11 +15,11 @@ func TestSetGoroutineLabels(t *testing.T) {
 	sync := make(chan struct{})
 
 	wantLabels := map[string]string{}
-	if gotLabels := getProfLabel(); !reflect.DeepEqual(gotLabels, wantLabels) {
+	if gotLabels := getProfLabel(); !maps.Equal(gotLabels, wantLabels) {
 		t.Errorf("Expected parent goroutine's profile labels to be empty before test, got %v", gotLabels)
 	}
 	go func() {
-		if gotLabels := getProfLabel(); !reflect.DeepEqual(gotLabels, wantLabels) {
+		if gotLabels := getProfLabel(); !maps.Equal(gotLabels, wantLabels) {
 			t.Errorf("Expected child goroutine's profile labels to be empty before test, got %v", gotLabels)
 		}
 		sync <- struct{}{}
@@ -29,11 +29,11 @@ func TestSetGoroutineLabels(t *testing.T) {
 	wantLabels = map[string]string{"key": "value"}
 	ctx := WithLabels(context.Background(), Labels("key", "value"))
 	SetGoroutineLabels(ctx)
-	if gotLabels := getProfLabel(); !reflect.DeepEqual(gotLabels, wantLabels) {
+	if gotLabels := getProfLabel(); !maps.Equal(gotLabels, wantLabels) {
 		t.Errorf("parent goroutine's profile labels: got %v, want %v", gotLabels, wantLabels)
 	}
 	go func() {
-		if gotLabels := getProfLabel(); !reflect.DeepEqual(gotLabels, wantLabels) {
+		if gotLabels := getProfLabel(); !maps.Equal(gotLabels, wantLabels) {
 			t.Errorf("child goroutine's profile labels: got %v, want %v", gotLabels, wantLabels)
 		}
 		sync <- struct{}{}
@@ -43,11 +43,11 @@ func TestSetGoroutineLabels(t *testing.T) {
 	wantLabels = map[string]string{}
 	ctx = context.Background()
 	SetGoroutineLabels(ctx)
-	if gotLabels := getProfLabel(); !reflect.DeepEqual(gotLabels, wantLabels) {
+	if gotLabels := getProfLabel(); !maps.Equal(gotLabels, wantLabels) {
 		t.Errorf("Expected parent goroutine's profile labels to be empty, got %v", gotLabels)
 	}
 	go func() {
-		if gotLabels := getProfLabel(); !reflect.DeepEqual(gotLabels, wantLabels) {
+		if gotLabels := getProfLabel(); !maps.Equal(gotLabels, wantLabels) {
 			t.Errorf("Expected child goroutine's profile labels to be empty, got %v", gotLabels)
 		}
 		sync <- struct{}{}
@@ -57,20 +57,20 @@ func TestSetGoroutineLabels(t *testing.T) {
 
 func TestDo(t *testing.T) {
 	wantLabels := map[string]string{}
-	if gotLabels := getProfLabel(); !reflect.DeepEqual(gotLabels, wantLabels) {
+	if gotLabels := getProfLabel(); !maps.Equal(gotLabels, wantLabels) {
 		t.Errorf("Expected parent goroutine's profile labels to be empty before Do, got %v", gotLabels)
 	}
 
 	Do(context.Background(), Labels("key1", "value1", "key2", "value2"), func(ctx context.Context) {
 		wantLabels := map[string]string{"key1": "value1", "key2": "value2"}
-		if gotLabels := getProfLabel(); !reflect.DeepEqual(gotLabels, wantLabels) {
+		if gotLabels := getProfLabel(); !maps.Equal(gotLabels, wantLabels) {
 			t.Errorf("parent goroutine's profile labels: got %v, want %v", gotLabels, wantLabels)
 		}
 
 		sync := make(chan struct{})
 		go func() {
 			wantLabels := map[string]string{"key1": "value1", "key2": "value2"}
-			if gotLabels := getProfLabel(); !reflect.DeepEqual(gotLabels, wantLabels) {
+			if gotLabels := getProfLabel(); !maps.Equal(gotLabels, wantLabels) {
 				t.Errorf("child goroutine's profile labels: got %v, want %v", gotLabels, wantLabels)
 			}
 			sync <- struct{}{}
@@ -80,7 +80,7 @@ func TestDo(t *testing.T) {
 	})
 
 	wantLabels = map[string]string{}
-	if gotLabels := getProfLabel(); !reflect.DeepEqual(gotLabels, wantLabels) {
+	if gotLabels := getProfLabel(); !maps.Equal(gotLabels, wantLabels) {
 		fmt.Printf("%#v", gotLabels)
 		fmt.Printf("%#v", wantLabels)
 		t.Errorf("Expected parent goroutine's profile labels to be empty after Do, got %v", gotLabels)
@@ -92,5 +92,9 @@ func getProfLabel() map[string]string {
 	if l == nil {
 		return map[string]string{}
 	}
-	return *l
+	m := make(map[string]string, len(l.list))
+	for _, lbl := range l.list {
+		m[lbl.key] = lbl.value
+	}
+	return m
 }
diff --git a/src/runtime/pprof/vminfo_darwin_test.go b/src/runtime/pprof/vminfo_darwin_test.go
index 64158720..6d375c5d 100644
--- a/src/runtime/pprof/vminfo_darwin_test.go
+++ b/src/runtime/pprof/vminfo_darwin_test.go
@@ -17,6 +17,7 @@ import (
 	"strconv"
 	"strings"
 	"testing"
+	"time"
 )
 
 func TestVMInfo(t *testing.T) {
@@ -56,18 +57,35 @@ func TestVMInfo(t *testing.T) {
 	}
 }
 
+type mapping struct {
+	hi, lo uint64
+	err    error
+}
+
 func useVMMapWithRetry(t *testing.T) (hi, lo uint64, err error) {
 	var retryable bool
-	for {
-		hi, lo, retryable, err = useVMMap(t)
-		if err == nil {
-			return hi, lo, nil
+	ch := make(chan mapping)
+	go func() {
+		for {
+			hi, lo, retryable, err = useVMMap(t)
+			if err == nil {
+				ch <- mapping{hi, lo, nil}
+				return
+			}
+			if !retryable {
+				ch <- mapping{0, 0, err}
+				return
+			}
+			t.Logf("retrying vmmap after error: %v", err)
 		}
-		if !retryable {
-			return 0, 0, err
-		}
-		t.Logf("retrying vmmap after error: %v", err)
+	}()
+	select {
+	case m := <-ch:
+		return m.hi, m.lo, m.err
+	case <-time.After(time.Minute):
+		t.Skip("vmmap taking too long")
 	}
+	return 0, 0, fmt.Errorf("unreachable")
 }
 
 func useVMMap(t *testing.T) (hi, lo uint64, retryable bool, err error) {
@@ -79,7 +97,7 @@ func useVMMap(t *testing.T) (hi, lo uint64, retryable bool, err error) {
 		t.Logf("vmmap output: %s", out)
 		if ee, ok := cmdErr.(*exec.ExitError); ok && len(ee.Stderr) > 0 {
 			t.Logf("%v: %v\n%s", cmd, cmdErr, ee.Stderr)
-			if testing.Short() && strings.Contains(string(ee.Stderr), "No process corpse slots currently available, waiting to get one") {
+			if testing.Short() && (strings.Contains(string(ee.Stderr), "No process corpse slots currently available, waiting to get one") || strings.Contains(string(ee.Stderr), "Failed to generate corpse from the process")) {
 				t.Skipf("Skipping knwn flake in short test mode")
 			}
 			retryable = bytes.Contains(ee.Stderr, []byte("resource shortage"))
diff --git a/src/runtime/preempt_amd64.s b/src/runtime/preempt_amd64.s
index 94a84fb7..8e3ed0d7 100644
--- a/src/runtime/preempt_amd64.s
+++ b/src/runtime/preempt_amd64.s
@@ -27,13 +27,6 @@ TEXT ·asyncPreempt(SB),NOSPLIT|NOFRAME,$0-0
 	MOVQ R13, 88(SP)
 	MOVQ R14, 96(SP)
 	MOVQ R15, 104(SP)
-	#ifdef GOOS_darwin
-	#ifndef hasAVX
-	CMPB internal∕cpu·X86+const_offsetX86HasAVX(SB), $0
-	JE 2(PC)
-	#endif
-	VZEROUPPER
-	#endif
 	MOVUPS X0, 112(SP)
 	MOVUPS X1, 128(SP)
 	MOVUPS X2, 144(SP)
diff --git a/src/runtime/proc.go b/src/runtime/proc.go
index e3cdf719..e9873e54 100644
--- a/src/runtime/proc.go
+++ b/src/runtime/proc.go
@@ -11,8 +11,8 @@ import (
 	"internal/goos"
 	"internal/runtime/atomic"
 	"internal/runtime/exithook"
+	"internal/runtime/sys"
 	"internal/stringslite"
-	"runtime/internal/sys"
 	"unsafe"
 )
 
@@ -266,6 +266,17 @@ func main() {
 	if isarchive || islibrary {
 		// A program compiled with -buildmode=c-archive or c-shared
 		// has a main, but it is not executed.
+		if GOARCH == "wasm" {
+			// On Wasm, pause makes it return to the host.
+			// Unlike cgo callbacks where Ms are created on demand,
+			// on Wasm we have only one M. So we keep this M (and this
+			// G) for callbacks.
+			// Using the caller's SP unwinds this frame and backs to
+			// goexit. The -16 is: 8 for goexit's (fake) return PC,
+			// and pause's epilogue pops 8.
+			pause(sys.GetCallerSP() - 16) // should not return
+			panic("unreachable")
+		}
 		return
 	}
 	fn := main_main // make an indirect call, as the linker doesn't know the address of the main package when laying down the runtime
@@ -739,6 +750,11 @@ func cpuinit(env string) {
 
 	case "arm64":
 		arm64HasATOMICS = cpu.ARM64.HasATOMICS
+
+	case "loong64":
+		loong64HasLAMCAS = cpu.Loong64.HasLAMCAS
+		loong64HasLAM_BH = cpu.Loong64.HasLAM_BH
+		loong64HasLSX = cpu.Loong64.HasLSX
 	}
 }
 
@@ -799,6 +815,8 @@ func schedinit() {
 	// extremely short.
 	lockInit(&memstats.heapStats.noPLock, lockRankLeafRank)
 
+	lockVerifyMSize()
+
 	// raceinit must be the first call to race detector.
 	// In particular, it must be done before mallocinit below calls racemapshadow.
 	gp := getg()
@@ -1211,6 +1229,12 @@ func casgstatus(gp *g, oldval, newval uint32) {
 		}
 	}
 
+	if gp.syncGroup != nil {
+		systemstack(func() {
+			gp.syncGroup.changegstatus(gp, oldval, newval)
+		})
+	}
+
 	if oldval == _Grunning {
 		// Track every gTrackingPeriod time a goroutine transitions out of running.
 		if casgstatusAlwaysTrack || gp.trackingSeq%gTrackingPeriod == 0 {
@@ -1293,25 +1317,6 @@ func casGToWaitingForGC(gp *g, old uint32, reason waitReason) {
 	casGToWaiting(gp, old, reason)
 }
 
-// casgstatus(gp, oldstatus, Gcopystack), assuming oldstatus is Gwaiting or Grunnable.
-// Returns old status. Cannot call casgstatus directly, because we are racing with an
-// async wakeup that might come in from netpoll. If we see Gwaiting from the readgstatus,
-// it might have become Grunnable by the time we get to the cas. If we called casgstatus,
-// it would loop waiting for the status to go back to Gwaiting, which it never will.
-//
-//go:nosplit
-func casgcopystack(gp *g) uint32 {
-	for {
-		oldstatus := readgstatus(gp) &^ _Gscan
-		if oldstatus != _Gwaiting && oldstatus != _Grunnable {
-			throw("copystack: bad status, not Gwaiting or Grunnable")
-		}
-		if gp.atomicstatus.CompareAndSwap(oldstatus, _Gcopystack) {
-			return oldstatus
-		}
-	}
-}
-
 // casGToPreemptScan transitions gp from _Grunning to _Gscan|_Gpreempted.
 //
 // TODO(austin): This is the only status operation that both changes
@@ -1323,6 +1328,12 @@ func casGToPreemptScan(gp *g, old, new uint32) {
 	acquireLockRankAndM(lockRankGscan)
 	for !gp.atomicstatus.CompareAndSwap(_Grunning, _Gscan|_Gpreempted) {
 	}
+	// We never notify gp.syncGroup that the goroutine state has moved
+	// from _Grunning to _Gpreempted. We call syncGroup.changegstatus
+	// after status changes happen, but doing so here would violate the
+	// ordering between the gscan and synctest locks. syncGroup doesn't
+	// distinguish between _Grunning and _Gpreempted anyway, so not
+	// notifying it is fine.
 }
 
 // casGFromPreempted attempts to transition gp from _Gpreempted to
@@ -1333,7 +1344,13 @@ func casGFromPreempted(gp *g, old, new uint32) bool {
 		throw("bad g transition")
 	}
 	gp.waitreason = waitReasonPreempted
-	return gp.atomicstatus.CompareAndSwap(_Gpreempted, _Gwaiting)
+	if !gp.atomicstatus.CompareAndSwap(_Gpreempted, _Gwaiting) {
+		return false
+	}
+	if sg := gp.syncGroup; sg != nil {
+		sg.changegstatus(gp, _Gpreempted, _Gwaiting)
+	}
+	return true
 }
 
 // stwReason is an enumeration of reasons the world is stopping.
@@ -1800,7 +1817,7 @@ func mstart0() {
 	mexit(osStack)
 }
 
-// The go:noinline is to guarantee the getcallerpc/getcallersp below are safe,
+// The go:noinline is to guarantee the sys.GetCallerPC/sys.GetCallerSP below are safe,
 // so that we can set up g0.sched to return to the call of mstart1 above.
 //
 //go:noinline
@@ -1818,8 +1835,8 @@ func mstart1() {
 	// And goexit0 does a gogo that needs to return from mstart1
 	// and let mstart0 exit the thread.
 	gp.sched.g = guintptr(unsafe.Pointer(gp))
-	gp.sched.pc = getcallerpc()
-	gp.sched.sp = getcallersp()
+	gp.sched.pc = sys.GetCallerPC()
+	gp.sched.sp = sys.GetCallerSP()
 
 	asminit()
 	minit()
@@ -1830,6 +1847,10 @@ func mstart1() {
 		mstartm0()
 	}
 
+	if debug.dataindependenttiming == 1 {
+		sys.EnableDIT()
+	}
+
 	if fn := gp.m.mstartfn; fn != nil {
 		fn()
 	}
@@ -2318,7 +2339,7 @@ func needm(signal bool) {
 	// Install g (= m->g0) and set the stack bounds
 	// to match the current stack.
 	setg(mp.g0)
-	sp := getcallersp()
+	sp := sys.GetCallerSP()
 	callbackUpdateSystemStack(mp, sp, signal)
 
 	// Should mark we are already in Go now.
@@ -4071,6 +4092,15 @@ func park_m(gp *g) {
 
 	trace := traceAcquire()
 
+	// If g is in a synctest group, we don't want to let the group
+	// become idle until after the waitunlockf (if any) has confirmed
+	// that the park is happening.
+	// We need to record gp.syncGroup here, since waitunlockf can change it.
+	sg := gp.syncGroup
+	if sg != nil {
+		sg.incActive()
+	}
+
 	if trace.ok() {
 		// Trace the event before the transition. It may take a
 		// stack trace, but we won't own the stack after the
@@ -4093,6 +4123,9 @@ func park_m(gp *g) {
 		if !ok {
 			trace := traceAcquire()
 			casgstatus(gp, _Gwaiting, _Grunnable)
+			if sg != nil {
+				sg.decActive()
+			}
 			if trace.ok() {
 				trace.GoUnpark(gp, 2)
 				traceRelease(trace)
@@ -4100,6 +4133,11 @@ func park_m(gp *g) {
 			execute(gp, true) // Schedule it back, never returns.
 		}
 	}
+
+	if sg != nil {
+		sg.decActive()
+	}
+
 	schedule()
 }
 
@@ -4253,6 +4291,9 @@ func goyield_m(gp *g) {
 // Finishes execution of the current goroutine.
 func goexit1() {
 	if raceenabled {
+		if gp := getg(); gp.syncGroup != nil {
+			racereleasemergeg(gp, gp.syncGroup.raceaddr())
+		}
 		racegoend()
 	}
 	trace := traceAcquire()
@@ -4291,6 +4332,7 @@ func gdestroy(gp *g) {
 	gp.param = nil
 	gp.labels = nil
 	gp.timer = nil
+	gp.syncGroup = nil
 
 	if gcBlackenEnabled != 0 && gp.gcAssistBytes > 0 {
 		// Flush assist credit to the global pool. This gives
@@ -4311,6 +4353,9 @@ func gdestroy(gp *g) {
 
 	if locked && mp.lockedInt != 0 {
 		print("runtime: mp.lockedInt = ", mp.lockedInt, "\n")
+		if mp.isextra {
+			throw("runtime.Goexit called in a thread that was not created by the Go runtime")
+		}
 		throw("exited a goroutine internally locked to the OS thread")
 	}
 	gfput(pp, gp)
@@ -4483,7 +4528,7 @@ func entersyscall() {
 	// the stack. This results in exceeding the nosplit stack requirements
 	// on some platforms.
 	fp := getcallerfp()
-	reentersyscall(getcallerpc(), getcallersp(), fp)
+	reentersyscall(sys.GetCallerPC(), sys.GetCallerSP(), fp)
 }
 
 func entersyscall_sysmon() {
@@ -4548,8 +4593,8 @@ func entersyscallblock() {
 	gp.m.p.ptr().syscalltick++
 
 	// Leave SP around for GC and traceback.
-	pc := getcallerpc()
-	sp := getcallersp()
+	pc := sys.GetCallerPC()
+	sp := sys.GetCallerSP()
 	bp := getcallerfp()
 	save(pc, sp, bp)
 	gp.syscallsp = gp.sched.sp
@@ -4581,7 +4626,7 @@ func entersyscallblock() {
 	systemstack(entersyscallblock_handoff)
 
 	// Resave for traceback during blocked call.
-	save(getcallerpc(), getcallersp(), getcallerfp())
+	save(sys.GetCallerPC(), sys.GetCallerSP(), getcallerfp())
 
 	gp.m.locks--
 }
@@ -4619,7 +4664,7 @@ func exitsyscall() {
 	gp := getg()
 
 	gp.m.locks++ // see comment in entersyscall
-	if getcallersp() > gp.syscallsp {
+	if sys.GetCallerSP() > gp.syscallsp {
 		throw("exitsyscall: syscall frame is no longer valid")
 	}
 
@@ -4835,7 +4880,6 @@ func exitsyscall0(gp *g) {
 // syscall_runtime_BeforeFork is for package syscall,
 // but widely used packages access it using linkname.
 // Notable members of the hall of shame include:
-//   - github.com/containerd/containerd
 //   - gvisor.dev/gvisor
 //
 // Do not remove or change the type signature.
@@ -4865,7 +4909,6 @@ func syscall_runtime_BeforeFork() {
 // syscall_runtime_AfterFork is for package syscall,
 // but widely used packages access it using linkname.
 // Notable members of the hall of shame include:
-//   - github.com/containerd/containerd
 //   - gvisor.dev/gvisor
 //
 // Do not remove or change the type signature.
@@ -4899,7 +4942,6 @@ var inForkedChild bool
 // syscall_runtime_AfterForkInChild is for package syscall,
 // but widely used packages access it using linkname.
 // Notable members of the hall of shame include:
-//   - github.com/containerd/containerd
 //   - gvisor.dev/gvisor
 //
 // Do not remove or change the type signature.
@@ -4974,7 +5016,7 @@ func malg(stacksize int32) *g {
 // The compiler turns a go statement into a call to this.
 func newproc(fn *funcval) {
 	gp := getg()
-	pc := getcallerpc()
+	pc := sys.GetCallerPC()
 	systemstack(func() {
 		newg := newproc1(fn, gp, pc, false, waitReasonZero)
 
@@ -5037,7 +5079,8 @@ func newproc1(fn *funcval, callergp *g, callerpc uintptr, parked bool, waitreaso
 	if isSystemGoroutine(newg, false) {
 		sched.ngsys.Add(1)
 	} else {
-		// Only user goroutines inherit pprof labels.
+		// Only user goroutines inherit synctest groups and pprof labels.
+		newg.syncGroup = callergp.syncGroup
 		if mp.curg != nil {
 			newg.labels = mp.curg.labels
 		}
@@ -5064,7 +5107,6 @@ func newproc1(fn *funcval, callergp *g, callerpc uintptr, parked bool, waitreaso
 		status = _Gwaiting
 		newg.waitreason = waitreason
 	}
-	casgstatus(newg, _Gdead, status)
 	if pp.goidcache == pp.goidcacheend {
 		// Sched.goidgen is the last allocated id,
 		// this batch must be [sched.goidgen+1, sched.goidgen+GoidCacheBatch].
@@ -5074,6 +5116,7 @@ func newproc1(fn *funcval, callergp *g, callerpc uintptr, parked bool, waitreaso
 		pp.goidcacheend = pp.goidcache + _GoidCacheBatch
 	}
 	newg.goid = pp.goidcache
+	casgstatus(newg, _Gdead, status)
 	pp.goidcache++
 	newg.trace.reset()
 	if trace.ok() {
@@ -5926,7 +5969,9 @@ func checkdead() {
 	// For -buildmode=c-shared or -buildmode=c-archive it's OK if
 	// there are no running goroutines. The calling program is
 	// assumed to be running.
-	if islibrary || isarchive {
+	// One exception is Wasm, which is single-threaded. If we are
+	// in Go and all goroutines are blocked, it deadlocks.
+	if (islibrary || isarchive) && GOARCH != "wasm" {
 		return
 	}
 
@@ -7133,6 +7178,31 @@ func sync_atomic_runtime_procUnpin() {
 	procUnpin()
 }
 
+// Active spinning for sync.Mutex.
+//
+//go:linkname internal_sync_runtime_canSpin internal/sync.runtime_canSpin
+//go:nosplit
+func internal_sync_runtime_canSpin(i int) bool {
+	// sync.Mutex is cooperative, so we are conservative with spinning.
+	// Spin only few times and only if running on a multicore machine and
+	// GOMAXPROCS>1 and there is at least one other running P and local runq is empty.
+	// As opposed to runtime mutex we don't do passive spinning here,
+	// because there can be work on global runq or on other Ps.
+	if i >= active_spin || ncpu <= 1 || gomaxprocs <= sched.npidle.Load()+sched.nmspinning.Load()+1 {
+		return false
+	}
+	if p := getg().m.p.ptr(); !runqempty(p) {
+		return false
+	}
+	return true
+}
+
+//go:linkname internal_sync_runtime_doSpin internal/sync.runtime_doSpin
+//go:nosplit
+func internal_sync_runtime_doSpin() {
+	procyield(active_spin_cnt)
+}
+
 // Active spinning for sync.Mutex.
 //
 // sync_runtime_canSpin should be an internal detail,
@@ -7148,18 +7218,7 @@ func sync_atomic_runtime_procUnpin() {
 //go:linkname sync_runtime_canSpin sync.runtime_canSpin
 //go:nosplit
 func sync_runtime_canSpin(i int) bool {
-	// sync.Mutex is cooperative, so we are conservative with spinning.
-	// Spin only few times and only if running on a multicore machine and
-	// GOMAXPROCS>1 and there is at least one other running P and local runq is empty.
-	// As opposed to runtime mutex we don't do passive spinning here,
-	// because there can be work on global runq or on other Ps.
-	if i >= active_spin || ncpu <= 1 || gomaxprocs <= sched.npidle.Load()+sched.nmspinning.Load()+1 {
-		return false
-	}
-	if p := getg().m.p.ptr(); !runqempty(p) {
-		return false
-	}
-	return true
+	return internal_sync_runtime_canSpin(i)
 }
 
 // sync_runtime_doSpin should be an internal detail,
@@ -7175,7 +7234,7 @@ func sync_runtime_canSpin(i int) bool {
 //go:linkname sync_runtime_doSpin sync.runtime_doSpin
 //go:nosplit
 func sync_runtime_doSpin() {
-	procyield(active_spin_cnt)
+	internal_sync_runtime_doSpin()
 }
 
 var stealOrder randomOrder
diff --git a/src/runtime/profbuf_test.go b/src/runtime/profbuf_test.go
index dac78ffd..9050d1fa 100644
--- a/src/runtime/profbuf_test.go
+++ b/src/runtime/profbuf_test.go
@@ -5,8 +5,8 @@
 package runtime_test
 
 import (
-	"reflect"
 	. "runtime"
+	"slices"
 	"testing"
 	"time"
 	"unsafe"
@@ -20,7 +20,7 @@ func TestProfBuf(t *testing.T) {
 	}
 	read := func(t *testing.T, b *ProfBuf, data []uint64, tags []unsafe.Pointer) {
 		rdata, rtags, eof := b.Read(ProfBufNonBlocking)
-		if !reflect.DeepEqual(rdata, data) || !reflect.DeepEqual(rtags, tags) {
+		if !slices.Equal(rdata, data) || !slices.Equal(rtags, tags) {
 			t.Fatalf("unexpected profile read:\nhave data %#x\nwant data %#x\nhave tags %#x\nwant tags %#x", rdata, data, rtags, tags)
 		}
 		if eof {
@@ -32,7 +32,7 @@ func TestProfBuf(t *testing.T) {
 		go func() {
 			eof := data == nil
 			rdata, rtags, reof := b.Read(ProfBufBlocking)
-			if !reflect.DeepEqual(rdata, data) || !reflect.DeepEqual(rtags, tags) || reof != eof {
+			if !slices.Equal(rdata, data) || !slices.Equal(rtags, tags) || reof != eof {
 				// Errorf, not Fatalf, because called in goroutine.
 				t.Errorf("unexpected profile read:\nhave data %#x\nwant data %#x\nhave tags %#x\nwant tags %#x\nhave eof=%v, want %v", rdata, data, rtags, tags, reof, eof)
 			}
diff --git a/src/runtime/proflabel.go b/src/runtime/proflabel.go
index 1a5e7e5e..f9b9dd16 100644
--- a/src/runtime/proflabel.go
+++ b/src/runtime/proflabel.go
@@ -12,7 +12,6 @@ var labelSync uintptr
 // but widely used packages access it using linkname.
 // Notable members of the hall of shame include:
 //   - github.com/cloudwego/localsession
-//   - github.com/DataDog/datadog-agent
 //
 // Do not remove or change the type signature.
 // See go.dev/issue/67401.
@@ -47,7 +46,6 @@ func runtime_setProfLabel(labels unsafe.Pointer) {
 // but widely used packages access it using linkname.
 // Notable members of the hall of shame include:
 //   - github.com/cloudwego/localsession
-//   - github.com/DataDog/datadog-agent
 //
 // Do not remove or change the type signature.
 // See go.dev/issue/67401.
diff --git a/src/runtime/race.go b/src/runtime/race.go
index 7d5cbce4..6b7bbe52 100644
--- a/src/runtime/race.go
+++ b/src/runtime/race.go
@@ -14,16 +14,49 @@ import (
 // Public race detection API, present iff build with -race.
 
 func RaceRead(addr unsafe.Pointer)
+
+//go:linkname race_Read internal/race.Read
+//go:nosplit
+func race_Read(addr unsafe.Pointer) {
+	RaceRead(addr)
+}
+
 func RaceWrite(addr unsafe.Pointer)
+
+//go:linkname race_Write internal/race.Write
+//go:nosplit
+func race_Write(addr unsafe.Pointer) {
+	RaceWrite(addr)
+}
+
 func RaceReadRange(addr unsafe.Pointer, len int)
+
+//go:linkname race_ReadRange internal/race.ReadRange
+//go:nosplit
+func race_ReadRange(addr unsafe.Pointer, len int) {
+	RaceReadRange(addr, len)
+}
+
 func RaceWriteRange(addr unsafe.Pointer, len int)
 
+//go:linkname race_WriteRange internal/race.WriteRange
+//go:nosplit
+func race_WriteRange(addr unsafe.Pointer, len int) {
+	RaceWriteRange(addr, len)
+}
+
 func RaceErrors() int {
 	var n uint64
 	racecall(&__tsan_report_count, uintptr(unsafe.Pointer(&n)), 0, 0, 0)
 	return int(n)
 }
 
+//go:linkname race_Errors internal/race.Errors
+//go:nosplit
+func race_Errors() int {
+	return RaceErrors()
+}
+
 // RaceAcquire/RaceRelease/RaceReleaseMerge establish happens-before relations
 // between goroutines. These inform the race detector about actual synchronization
 // that it can't see for some reason (e.g. synchronization within RaceDisable/RaceEnable
@@ -38,6 +71,12 @@ func RaceAcquire(addr unsafe.Pointer) {
 	raceacquire(addr)
 }
 
+//go:linkname race_Acquire internal/race.Acquire
+//go:nosplit
+func race_Acquire(addr unsafe.Pointer) {
+	RaceAcquire(addr)
+}
+
 // RaceRelease performs a release operation on addr that
 // can synchronize with a later RaceAcquire on addr.
 //
@@ -49,6 +88,12 @@ func RaceRelease(addr unsafe.Pointer) {
 	racerelease(addr)
 }
 
+//go:linkname race_Release internal/race.Release
+//go:nosplit
+func race_Release(addr unsafe.Pointer) {
+	RaceRelease(addr)
+}
+
 // RaceReleaseMerge is like RaceRelease, but also establishes a happens-before
 // relation with the preceding RaceRelease or RaceReleaseMerge on addr.
 //
@@ -60,6 +105,12 @@ func RaceReleaseMerge(addr unsafe.Pointer) {
 	racereleasemerge(addr)
 }
 
+//go:linkname race_ReleaseMerge internal/race.ReleaseMerge
+//go:nosplit
+func race_ReleaseMerge(addr unsafe.Pointer) {
+	RaceReleaseMerge(addr)
+}
+
 // RaceDisable disables handling of race synchronization events in the current goroutine.
 // Handling is re-enabled with RaceEnable. RaceDisable/RaceEnable can be nested.
 // Non-synchronization events (memory accesses, function entry/exit) still affect
@@ -74,6 +125,12 @@ func RaceDisable() {
 	gp.raceignore++
 }
 
+//go:linkname race_Disable internal/race.Disable
+//go:nosplit
+func race_Disable() {
+	RaceDisable()
+}
+
 // RaceEnable re-enables handling of race events in the current goroutine.
 //
 //go:nosplit
@@ -85,6 +142,12 @@ func RaceEnable() {
 	}
 }
 
+//go:linkname race_Enable internal/race.Enable
+//go:nosplit
+func race_Enable() {
+	RaceEnable()
+}
+
 // Private interface for the runtime.
 
 const raceenabled = true
@@ -105,6 +168,11 @@ func raceReadObjectPC(t *_type, addr unsafe.Pointer, callerpc, pc uintptr) {
 	}
 }
 
+//go:linkname race_ReadObjectPC internal/race.ReadObjectPC
+func race_ReadObjectPC(t *abi.Type, addr unsafe.Pointer, callerpc, pc uintptr) {
+	raceReadObjectPC(t, addr, callerpc, pc)
+}
+
 func raceWriteObjectPC(t *_type, addr unsafe.Pointer, callerpc, pc uintptr) {
 	kind := t.Kind_ & abi.KindMask
 	if kind == abi.Array || kind == abi.Struct {
@@ -118,12 +186,27 @@ func raceWriteObjectPC(t *_type, addr unsafe.Pointer, callerpc, pc uintptr) {
 	}
 }
 
+//go:linkname race_WriteObjectPC internal/race.WriteObjectPC
+func race_WriteObjectPC(t *abi.Type, addr unsafe.Pointer, callerpc, pc uintptr) {
+	raceWriteObjectPC(t, addr, callerpc, pc)
+}
+
 //go:noescape
 func racereadpc(addr unsafe.Pointer, callpc, pc uintptr)
 
 //go:noescape
 func racewritepc(addr unsafe.Pointer, callpc, pc uintptr)
 
+//go:linkname race_ReadPC internal/race.ReadPC
+func race_ReadPC(addr unsafe.Pointer, callerpc, pc uintptr) {
+	racereadpc(addr, callerpc, pc)
+}
+
+//go:linkname race_WritePC internal/race.WritePC
+func race_WritePC(addr unsafe.Pointer, callerpc, pc uintptr) {
+	racewritepc(addr, callerpc, pc)
+}
+
 type symbolizeCodeContext struct {
 	pc   uintptr
 	fn   *byte
diff --git a/src/runtime/race/output_test.go b/src/runtime/race/output_test.go
index 0ee0f413..0d5c9096 100644
--- a/src/runtime/race/output_test.go
+++ b/src/runtime/race/output_test.go
@@ -476,5 +476,59 @@ Previous write at 0x[0-9,a-f]+ by main goroutine:
   main\.main\(\)
       .*/main.go:10 \+0x[0-9,a-f]+
 
+`}},
+	{"non_inline_array_compare", "run", "", "atexit_sleep_ms=0", `
+package main
+
+import (
+	"math/rand/v2"
+)
+
+var x = [1024]byte{}
+
+var ch = make(chan bool)
+
+func main() {
+	started := make(chan struct{})
+	go func() {
+		close(started)
+		var y = [len(x)]byte{}
+		eq := x == y
+		ch <- eq
+	}()
+	<-started
+	x[rand.IntN(len(x))]++
+	println(<-ch)
+}
+`, []string{`==================
+WARNING: DATA RACE
+`}},
+	{"non_inline_struct_compare", "run", "", "atexit_sleep_ms=0", `
+package main
+
+import "math/rand/v2"
+
+type S struct {
+	a [1024]byte
+}
+
+var x = S{a: [1024]byte{}}
+
+var ch = make(chan bool)
+
+func main() {
+	started := make(chan struct{})
+	go func() {
+		close(started)
+		var y = S{a: [len(x.a)]byte{}}
+		eq := x == y
+		ch <- eq
+	}()
+	<-started
+	x.a[rand.IntN(len(x.a))]++
+	println(<-ch)
+}
+`, []string{`==================
+WARNING: DATA RACE
 `}},
 }
diff --git a/src/runtime/race/race_test.go b/src/runtime/race/race_test.go
index 4fe61683..cbc90ea0 100644
--- a/src/runtime/race/race_test.go
+++ b/src/runtime/race/race_test.go
@@ -107,6 +107,11 @@ func processLog(testName string, tsanLog []string) string {
 			gotRace = true
 			break
 		}
+		if strings.Contains(s, "fatal error: concurrent map") {
+			// Detected by the runtime, not the race detector.
+			gotRace = true
+			break
+		}
 	}
 
 	failing := strings.Contains(testName, "Failing")
@@ -177,8 +182,11 @@ func runTests(t *testing.T) ([]byte, error) {
 	)
 	// There are races: we expect tests to fail and the exit code to be non-zero.
 	out, _ := cmd.CombinedOutput()
-	if bytes.Contains(out, []byte("fatal error:")) {
-		// But don't expect runtime to crash.
+	fatals := bytes.Count(out, []byte("fatal error:"))
+	mapFatals := bytes.Count(out, []byte("fatal error: concurrent map"))
+	if fatals > mapFatals {
+		// But don't expect runtime to crash (other than
+		// in the map concurrent access detector).
 		return out, fmt.Errorf("runtime fatal error")
 	}
 	return out, nil
diff --git a/src/runtime/race/sched_test.go b/src/runtime/race/sched_test.go
index a66860cd..edff0d5c 100644
--- a/src/runtime/race/sched_test.go
+++ b/src/runtime/race/sched_test.go
@@ -8,8 +8,8 @@ package race_test
 
 import (
 	"fmt"
-	"reflect"
 	"runtime"
+	"slices"
 	"strings"
 	"testing"
 )
@@ -35,7 +35,7 @@ func TestRandomScheduling(t *testing.T) {
 	}
 
 	for i := 0; i < N; i++ {
-		if !reflect.DeepEqual(out[0], out[i]) {
+		if !slices.Equal(out[0], out[i]) {
 			return // found a different order
 		}
 	}
diff --git a/src/runtime/race/testdata/map_test.go b/src/runtime/race/testdata/map_test.go
index 88e735ec..83f59b75 100644
--- a/src/runtime/race/testdata/map_test.go
+++ b/src/runtime/race/testdata/map_test.go
@@ -242,7 +242,7 @@ func TestRaceMapAssignMultipleReturn(t *testing.T) {
 }
 
 // BigKey and BigVal must be larger than 256 bytes,
-// so that compiler sets KindGCProg for them.
+// so that compiler stores them indirectly.
 type BigKey [1000]*int
 
 type BigVal struct {
diff --git a/src/runtime/race/testdata/mop_test.go b/src/runtime/race/testdata/mop_test.go
index 6b1069fc..0d7d879d 100644
--- a/src/runtime/race/testdata/mop_test.go
+++ b/src/runtime/race/testdata/mop_test.go
@@ -612,6 +612,8 @@ func TestNoRaceEnoughRegisters(t *testing.T) {
 }
 
 // emptyFunc should not be inlined.
+//
+//go:noinline
 func emptyFunc(x int) {
 	if false {
 		fmt.Println(x)
@@ -1176,7 +1178,7 @@ func TestNoRaceHeapReallocation(t *testing.T) {
 	// others.
 	const n = 2
 	done := make(chan bool, n)
-	empty := func(p *int) {}
+	empty := func(p *int) { _ = p }
 	for i := 0; i < n; i++ {
 		ms := i
 		go func() {
@@ -1417,7 +1419,7 @@ func TestRaceInterCall2(t *testing.T) {
 
 func TestRaceFuncCall(t *testing.T) {
 	c := make(chan bool, 1)
-	f := func(x, y int) {}
+	f := func(x, y int) { _ = y }
 	x, y := 0, 0
 	go func() {
 		y = 42
@@ -1804,6 +1806,7 @@ func TestRaceAsFunc2(t *testing.T) {
 	x := 0
 	go func() {
 		func(x int) {
+			_ = x
 		}(x)
 		c <- true
 	}()
@@ -1817,6 +1820,7 @@ func TestRaceAsFunc3(t *testing.T) {
 	x := 0
 	go func() {
 		func(x int) {
+			_ = x
 			mu.Lock()
 		}(x) // Read of x must be outside of the mutex.
 		mu.Unlock()
diff --git a/src/runtime/race_amd64.s b/src/runtime/race_amd64.s
index c4a6d493..9c563892 100644
--- a/src/runtime/race_amd64.s
+++ b/src/runtime/race_amd64.s
@@ -43,7 +43,7 @@
 // func runtime·raceread(addr uintptr)
 // Called from instrumented code.
 // Defined as ABIInternal so as to avoid introducing a wrapper,
-// which would render runtime.getcallerpc ineffective.
+// which would render sys.GetCallerPC ineffective.
 TEXT	runtime·raceread(SB), NOSPLIT, $0-8
 	MOVQ	AX, RARG1
 	MOVQ	(SP), RARG2
@@ -69,7 +69,7 @@ TEXT	runtime·racereadpc(SB), NOSPLIT, $0-24
 // func runtime·racewrite(addr uintptr)
 // Called from instrumented code.
 // Defined as ABIInternal so as to avoid introducing a wrapper,
-// which would render runtime.getcallerpc ineffective.
+// which would render sys.GetCallerPC ineffective.
 TEXT	runtime·racewrite(SB), NOSPLIT, $0-8
 	MOVQ	AX, RARG1
 	MOVQ	(SP), RARG2
@@ -95,7 +95,7 @@ TEXT	runtime·racewritepc(SB), NOSPLIT, $0-24
 // func runtime·racereadrange(addr, size uintptr)
 // Called from instrumented code.
 // Defined as ABIInternal so as to avoid introducing a wrapper,
-// which would render runtime.getcallerpc ineffective.
+// which would render sys.GetCallerPC ineffective.
 TEXT	runtime·racereadrange(SB), NOSPLIT, $0-16
 	MOVQ	AX, RARG1
 	MOVQ	BX, RARG2
@@ -122,7 +122,7 @@ TEXT	runtime·racereadrangepc1(SB), NOSPLIT, $0-24
 // func runtime·racewriterange(addr, size uintptr)
 // Called from instrumented code.
 // Defined as ABIInternal so as to avoid introducing a wrapper,
-// which would render runtime.getcallerpc ineffective.
+// which would render sys.GetCallerPC ineffective.
 TEXT	runtime·racewriterange(SB), NOSPLIT, $0-16
 	MOVQ	AX, RARG1
 	MOVQ	BX, RARG2
diff --git a/src/runtime/rand.go b/src/runtime/rand.go
index a66553fe..1739e9f8 100644
--- a/src/runtime/rand.go
+++ b/src/runtime/rand.go
@@ -7,9 +7,10 @@
 package runtime
 
 import (
+	"internal/byteorder"
 	"internal/chacha8rand"
 	"internal/goarch"
-	"runtime/internal/math"
+	"internal/runtime/math"
 	"unsafe"
 	_ "unsafe" // for go:linkname
 )
@@ -41,14 +42,15 @@ func randinit() {
 	}
 
 	seed := &globalRand.seed
-	if startupRand != nil {
+	if len(startupRand) >= 16 &&
+		// Check that at least the first two words of startupRand weren't
+		// cleared by any libc initialization.
+		!allZero(startupRand[:8]) && !allZero(startupRand[8:16]) {
 		for i, c := range startupRand {
 			seed[i%len(seed)] ^= c
 		}
-		clear(startupRand)
-		startupRand = nil
 	} else {
-		if readRandom(seed[:]) != len(seed) {
+		if readRandom(seed[:]) != len(seed) || allZero(seed[:]) {
 			// readRandom should never fail, but if it does we'd rather
 			// not make Go binaries completely unusable, so make up
 			// some random data based on the current time.
@@ -58,6 +60,25 @@ func randinit() {
 	}
 	globalRand.state.Init(*seed)
 	clear(seed[:])
+
+	if startupRand != nil {
+		// Overwrite startupRand instead of clearing it, in case cgo programs
+		// access it after we used it.
+		for len(startupRand) > 0 {
+			buf := make([]byte, 8)
+			for {
+				if x, ok := globalRand.state.Next(); ok {
+					byteorder.BEPutUint64(buf, x)
+					break
+				}
+				globalRand.state.Refill()
+			}
+			n := copy(startupRand, buf)
+			startupRand = startupRand[n:]
+		}
+		startupRand = nil
+	}
+
 	globalRand.init = true
 	unlock(&globalRand.lock)
 }
@@ -88,6 +109,14 @@ func readTimeRandom(r []byte) {
 	}
 }
 
+func allZero(b []byte) bool {
+	var acc byte
+	for _, x := range b {
+		acc |= x
+	}
+	return acc == 0
+}
+
 // bootstrapRand returns a random uint64 from the global random generator.
 func bootstrapRand() uint64 {
 	lock(&globalRand.lock)
@@ -122,6 +151,8 @@ func rand32() uint32 {
 }
 
 // rand returns a random uint64 from the per-m chacha8 state.
+// This is called from compiler-generated code.
+//
 // Do not change signature: used via linkname from other packages.
 //
 //go:nosplit
@@ -148,6 +179,11 @@ func rand() uint64 {
 	}
 }
 
+//go:linkname maps_rand internal/runtime/maps.rand
+func maps_rand() uint64 {
+	return rand()
+}
+
 // mrandinit initializes the random state of an m.
 func mrandinit(mp *m) {
 	var seed [4]uint64
diff --git a/src/runtime/rt0_js_wasm.s b/src/runtime/rt0_js_wasm.s
index 34a60474..c7a0a263 100644
--- a/src/runtime/rt0_js_wasm.s
+++ b/src/runtime/rt0_js_wasm.s
@@ -53,12 +53,6 @@ TEXT wasm_export_getsp(SB),NOSPLIT,$0
 	Get SP
 	Return
 
-TEXT runtime·pause(SB), NOSPLIT, $0-8
-	MOVD newsp+0(FP), SP
-	I32Const $1
-	Set PAUSE
-	RETUNWIND
-
 TEXT runtime·exit(SB), NOSPLIT, $0-4
 	I32Const $0
 	Call runtime·wasmExit(SB)
diff --git a/src/runtime/rt0_wasip1_wasm.s b/src/runtime/rt0_wasip1_wasm.s
index 6dc23930..a60566fe 100644
--- a/src/runtime/rt0_wasip1_wasm.s
+++ b/src/runtime/rt0_wasip1_wasm.s
@@ -14,3 +14,7 @@ TEXT _rt0_wasm_wasip1(SB),NOSPLIT,$0
 	Call wasm_pc_f_loop(SB)
 
 	Return
+
+TEXT _rt0_wasm_wasip1_lib(SB),NOSPLIT,$0
+	Call _rt0_wasm_wasip1(SB)
+	Return
diff --git a/src/runtime/runtime-gdb.py b/src/runtime/runtime-gdb.py
index 46f014fc..6d995151 100644
--- a/src/runtime/runtime-gdb.py
+++ b/src/runtime/runtime-gdb.py
@@ -160,7 +160,118 @@ class MapTypePrinter:
 		return str(self.val.type)
 
 	def children(self):
-		MapBucketCount = 8 # see internal/abi.go:MapBucketCount
+		fields = [f.name for f in self.val.type.strip_typedefs().target().fields()]
+		if 'buckets' in fields:
+			yield from self.old_map_children()
+		else:
+			yield from self.swiss_map_children()
+
+	def swiss_map_children(self):
+		SwissMapGroupSlots = 8 # see internal/abi:SwissMapGroupSlots
+
+		cnt = 0
+		# Yield keys and elements in group.
+		# group is a value of type *group[K,V]
+		def group_slots(group):
+			ctrl = group['ctrl']
+
+			for i in xrange(SwissMapGroupSlots):
+				c = (ctrl >> (8*i)) & 0xff
+				if (c & 0x80) != 0:
+					# Empty or deleted
+					continue
+
+				# Full
+				yield str(cnt), group['slots'][i]['key']
+				yield str(cnt+1), group['slots'][i]['elem']
+
+		# The linker DWARF generation
+		# (cmd/link/internal/ld.(*dwctxt).synthesizemaptypesSwiss) records
+		# dirPtr as a **table[K,V], but it may actually be two different types:
+		#
+		# For "full size" maps (dirLen > 0), dirPtr is actually a pointer to
+		# variable length array *[dirLen]*table[K,V]. In other words, dirPtr +
+		# dirLen are a deconstructed slice []*table[K,V].
+		#
+		# For "small" maps (dirLen <= 0), dirPtr is a pointer directly to a
+		# single group *group[K,V] containing the map slots.
+		#
+		# N.B. array() takes an _inclusive_ upper bound.
+
+		# table[K,V]
+		table_type = self.val['dirPtr'].type.target().target()
+
+		if self.val['dirLen'] <= 0:
+			# Small map
+
+			# We need to find the group type we'll cast to. Since dirPtr isn't
+			# actually **table[K,V], we can't use the nice API of
+			# obj['field'].type, as that actually wants to dereference obj.
+			# Instead, search only via the type API.
+			ptr_group_type = None
+			for tf in table_type.fields():
+				if tf.name != 'groups':
+					continue
+				groups_type = tf.type
+				for gf in groups_type.fields():
+					if gf.name != 'data':
+						continue
+					# *group[K,V]
+					ptr_group_type = gf.type
+
+			if ptr_group_type is None:
+				raise TypeError("unable to find table[K,V].groups.data")
+
+			# group = (*group[K,V])(dirPtr)
+			group = self.val['dirPtr'].cast(ptr_group_type)
+
+			yield from group_slots(group)
+
+			return
+
+		# Full size map.
+
+		# *table[K,V]
+		ptr_table_type = table_type.pointer()
+		# [dirLen]*table[K,V]
+		array_ptr_table_type = ptr_table_type.array(self.val['dirLen']-1)
+		# *[dirLen]*table[K,V]
+		ptr_array_ptr_table_type = array_ptr_table_type.pointer()
+		# tables = (*[dirLen]*table[K,V])(dirPtr)
+		tables = self.val['dirPtr'].cast(ptr_array_ptr_table_type)
+
+		cnt = 0
+		for t in xrange(self.val['dirLen']):
+			table = tables[t]
+			table = table.dereference()
+
+			groups = table['groups']['data']
+			length = table['groups']['lengthMask'] + 1
+
+			# The linker DWARF generation
+			# (cmd/link/internal/ld.(*dwctxt).synthesizemaptypesSwiss) records
+			# groups.data as a *group[K,V], but it is actually a pointer to
+			# variable length array *[length]group[K,V].
+			#
+			# N.B. array() takes an _inclusive_ upper bound.
+
+			# group[K,V]
+			group_type = groups.type.target()
+			# [length]group[K,V]
+			array_group_type = group_type.array(length-1)
+			# *[length]group[K,V]
+			ptr_array_group_type = array_group_type.pointer()
+			# groups = (*[length]group[K,V])(groups.data)
+			groups = groups.cast(ptr_array_group_type)
+			groups = groups.dereference()
+
+			for i in xrange(length):
+				group = groups[i]
+				yield from group_slots(group)
+
+
+	def old_map_children(self):
+		MapBucketCount = 8 # see internal/abi:OldMapBucketCount
 		B = self.val['B']
 		buckets = self.val['buckets']
 		oldbuckets = self.val['oldbuckets']
@@ -385,7 +496,7 @@ goobjfile.pretty_printers.append(ifacematcher)
 class GoLenFunc(gdb.Function):
 	"Length of strings, slices, maps or channels"
 
-	how = ((StringTypePrinter, 'len'), (SliceTypePrinter, 'len'), (MapTypePrinter, 'count'), (ChanTypePrinter, 'qcount'))
+	how = ((StringTypePrinter, 'len'), (SliceTypePrinter, 'len'), (MapTypePrinter, 'used'), (ChanTypePrinter, 'qcount'))
 
 	def __init__(self):
 		gdb.Function.__init__(self, "len")
@@ -394,6 +505,12 @@ class GoLenFunc(gdb.Function):
 		typename = str(obj.type)
 		for klass, fld in self.how:
 			if klass.pattern.match(typename) or paramtypematch(obj.type, klass.pattern):
+				if klass == MapTypePrinter:
+					fields = [f.name for f in self.val.type.strip_typedefs().target().fields()]
+					if 'buckets' in fields:
+						# Old maps.
+						fld = 'count'
+
 				return obj[fld]
 
 
diff --git a/src/runtime/runtime-gdb_test.go b/src/runtime/runtime-gdb_test.go
index 14561330..9c54d689 100644
--- a/src/runtime/runtime-gdb_test.go
+++ b/src/runtime/runtime-gdb_test.go
@@ -9,6 +9,7 @@ import (
 	"flag"
 	"fmt"
 	"internal/abi"
+	"internal/goexperiment"
 	"internal/testenv"
 	"os"
 	"os/exec"
@@ -111,6 +112,44 @@ func checkCleanBacktrace(t *testing.T, backtrace string) {
 	// TODO(mundaym): check for unknown frames (e.g. "??").
 }
 
+// checkPtraceScope checks the value of the kernel parameter ptrace_scope,
+// skips the test when gdb cannot attach to the target process via ptrace.
+// See issue 69932
+//
+// 0 - Default attach security permissions.
+// 1 - Restricted attach. Only child processes plus normal permissions.
+// 2 - Admin-only attach. Only executables with CAP_SYS_PTRACE.
+// 3 - No attach. No process may call ptrace at all. Irrevocable.
+func checkPtraceScope(t *testing.T) {
+	if runtime.GOOS != "linux" {
+		return
+	}
+
+	// If the Linux kernel does not have the YAMA module enabled,
+	// there will be no ptrace_scope file, which does not affect the tests.
+	path := "/proc/sys/kernel/yama/ptrace_scope"
+	if _, err := os.Stat(path); os.IsNotExist(err) {
+		return
+	}
+
+	data, err := os.ReadFile(path)
+	if err != nil {
+		t.Fatalf("failed to read file: %v", err)
+	}
+	value, err := strconv.Atoi(strings.TrimSpace(string(data)))
+	if err != nil {
+		t.Fatalf("failed converting value to int: %v", err)
+	}
+	switch value {
+	case 3:
+		t.Skip("skipping ptrace: Operation not permitted")
+	case 2:
+		if os.Geteuid() != 0 {
+			t.Skip("skipping ptrace: Operation not permitted with non-root user")
+		}
+	}
+}
+
 // NOTE: the maps below are allocated larger than abi.MapBucketCount
 // to ensure that they are not "optimized out".
 
@@ -118,15 +157,19 @@ var helloSource = `
 import "fmt"
 import "runtime"
 var gslice []string
+// TODO(prattmic): Stack allocated maps initialized inline appear "optimized out" in GDB.
+var smallmapvar map[string]string
 func main() {
-	mapvar := make(map[string]string, ` + strconv.FormatInt(abi.MapBucketCount+9, 10) + `)
-	slicemap := make(map[string][]string,` + strconv.FormatInt(abi.MapBucketCount+3, 10) + `)
+	smallmapvar = make(map[string]string)
+	mapvar := make(map[string]string, ` + strconv.FormatInt(abi.OldMapBucketCount+9, 10) + `)
+	slicemap := make(map[string][]string,` + strconv.FormatInt(abi.OldMapBucketCount+3, 10) + `)
     chanint := make(chan int, 10)
     chanstr := make(chan string, 10)
     chanint <- 99
 	chanint <- 11
     chanstr <- "spongepants"
     chanstr <- "squarebob"
+	smallmapvar["abc"] = "def"
 	mapvar["abc"] = "def"
 	mapvar["ghi"] = "jkl"
 	slicemap["a"] = []string{"b","c","d"}
@@ -140,6 +183,7 @@ func main() {
 	_ = ptrvar // set breakpoint here
 	gslice = slicevar
 	fmt.Printf("%v, %v, %v\n", slicemap, <-chanint, <-chanstr)
+	runtime.KeepAlive(smallmapvar)
 	runtime.KeepAlive(mapvar)
 }  // END_OF_PROGRAM
 `
@@ -193,6 +237,7 @@ func testGdbPython(t *testing.T, cgo bool) {
 	t.Parallel()
 	checkGdbVersion(t)
 	checkGdbPython(t)
+	checkPtraceScope(t)
 
 	dir := t.TempDir()
 
@@ -254,6 +299,9 @@ func testGdbPython(t *testing.T, cgo bool) {
 		"-ex", "echo BEGIN info goroutines\n",
 		"-ex", "info goroutines",
 		"-ex", "echo END\n",
+		"-ex", "echo BEGIN print smallmapvar\n",
+		"-ex", "print smallmapvar",
+		"-ex", "echo END\n",
 		"-ex", "echo BEGIN print mapvar\n",
 		"-ex", "print mapvar",
 		"-ex", "echo END\n",
@@ -306,6 +354,11 @@ func testGdbPython(t *testing.T, cgo bool) {
 		t.Fatalf("info goroutines failed: %s", bl)
 	}
 
+	printSmallMapvarRe := regexp.MustCompile(`^\$[0-9]+ = map\[string\]string = {\[(0x[0-9a-f]+\s+)?"abc"\] = (0x[0-9a-f]+\s+)?"def"}$`)
+	if bl := blocks["print smallmapvar"]; !printSmallMapvarRe.MatchString(bl) {
+		t.Fatalf("print smallmapvar failed: %s", bl)
+	}
+
 	printMapvarRe1 := regexp.MustCompile(`^\$[0-9]+ = map\[string\]string = {\[(0x[0-9a-f]+\s+)?"abc"\] = (0x[0-9a-f]+\s+)?"def", \[(0x[0-9a-f]+\s+)?"ghi"\] = (0x[0-9a-f]+\s+)?"jkl"}$`)
 	printMapvarRe2 := regexp.MustCompile(`^\$[0-9]+ = map\[string\]string = {\[(0x[0-9a-f]+\s+)?"ghi"\] = (0x[0-9a-f]+\s+)?"jkl", \[(0x[0-9a-f]+\s+)?"abc"\] = (0x[0-9a-f]+\s+)?"def"}$`)
 	if bl := blocks["print mapvar"]; !printMapvarRe1.MatchString(bl) &&
@@ -416,6 +469,7 @@ func TestGdbBacktrace(t *testing.T) {
 	checkGdbEnvironment(t)
 	t.Parallel()
 	checkGdbVersion(t)
+	checkPtraceScope(t)
 
 	dir := t.TempDir()
 
@@ -530,6 +584,7 @@ func TestGdbAutotmpTypes(t *testing.T) {
 	checkGdbEnvironment(t)
 	t.Parallel()
 	checkGdbVersion(t)
+	checkPtraceScope(t)
 
 	if runtime.GOOS == "aix" && testing.Short() {
 		t.Skip("TestGdbAutotmpTypes is too slow on aix/ppc64")
@@ -576,10 +631,21 @@ func TestGdbAutotmpTypes(t *testing.T) {
 	// Check that the backtrace matches the source code.
 	types := []string{
 		"[]main.astruct",
-		"bucket",
-		"hash",
 		"main.astruct",
-		"hash * map[string]main.astruct",
+	}
+	if goexperiment.SwissMap {
+		types = append(types, []string{
+			"groupReference",
+			"table",
+			"map",
+			"map * map[string]main.astruct",
+		}...)
+	} else {
+		types = append(types, []string{
+			"bucket",
+			"hash",
+			"hash * map[string]main.astruct",
+		}...)
 	}
 	for _, name := range types {
 		if !strings.Contains(sgot, name) {
@@ -604,6 +670,7 @@ func TestGdbConst(t *testing.T) {
 	checkGdbEnvironment(t)
 	t.Parallel()
 	checkGdbVersion(t)
+	checkPtraceScope(t)
 
 	dir := t.TempDir()
 
@@ -668,6 +735,7 @@ func TestGdbPanic(t *testing.T) {
 	checkGdbEnvironment(t)
 	t.Parallel()
 	checkGdbVersion(t)
+	checkPtraceScope(t)
 
 	if runtime.GOOS == "windows" {
 		t.Skip("no signals on windows")
@@ -747,6 +815,7 @@ func TestGdbInfCallstack(t *testing.T) {
 
 	t.Parallel()
 	checkGdbVersion(t)
+	checkPtraceScope(t)
 
 	dir := t.TempDir()
 
diff --git a/src/runtime/runtime1.go b/src/runtime/runtime1.go
index 03ef74b8..b47c5890 100644
--- a/src/runtime/runtime1.go
+++ b/src/runtime/runtime1.go
@@ -331,6 +331,7 @@ var debug struct {
 	traceadvanceperiod       int32
 	traceCheckStackOwnership int32
 	profstackdepth           int32
+	dataindependenttiming    int32
 
 	// debug.malloc is used as a combined debug check
 	// in the malloc function and should be set
@@ -367,6 +368,7 @@ var dbgvars = []*dbgVar{
 	{name: "asynctimerchan", atomic: &debug.asynctimerchan},
 	{name: "cgocheck", value: &debug.cgocheck},
 	{name: "clobberfree", value: &debug.clobberfree},
+	{name: "dataindependenttiming", value: &debug.dataindependenttiming},
 	{name: "disablethp", value: &debug.disablethp},
 	{name: "dontfreezetheworld", value: &debug.dontfreezetheworld},
 	{name: "efence", value: &debug.efence},
@@ -680,7 +682,6 @@ func reflect_resolveTypeOff(rtype unsafe.Pointer, off int32) unsafe.Pointer {
 // reflect_resolveTextOff is for package reflect,
 // but widely used packages access it using linkname.
 // Notable members of the hall of shame include:
-//   - github.com/cloudwego/frugal
 //   - github.com/agiledragon/gomonkey/v2
 //
 // Do not remove or change the type signature.
@@ -725,3 +726,13 @@ func reflect_addReflectOff(ptr unsafe.Pointer) int32 {
 	reflectOffsUnlock()
 	return id
 }
+
+//go:linkname fips_getIndicator crypto/internal/fips140.getIndicator
+func fips_getIndicator() uint8 {
+	return getg().fipsIndicator
+}
+
+//go:linkname fips_setIndicator crypto/internal/fips140.setIndicator
+func fips_setIndicator(indicator uint8) {
+	getg().fipsIndicator = indicator
+}
diff --git a/src/runtime/runtime2.go b/src/runtime/runtime2.go
index 4a1ee37a..e837c28a 100644
--- a/src/runtime/runtime2.go
+++ b/src/runtime/runtime2.go
@@ -8,8 +8,9 @@ import (
 	"internal/abi"
 	"internal/chacha8rand"
 	"internal/goarch"
+	"internal/goexperiment"
 	"internal/runtime/atomic"
-	"runtime/internal/sys"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
@@ -170,33 +171,6 @@ type mutex struct {
 	key uintptr
 }
 
-// sleep and wakeup on one-time events.
-// before any calls to notesleep or notewakeup,
-// must call noteclear to initialize the Note.
-// then, exactly one thread can call notesleep
-// and exactly one thread can call notewakeup (once).
-// once notewakeup has been called, the notesleep
-// will return.  future notesleep will return immediately.
-// subsequent noteclear must be called only after
-// previous notesleep has returned, e.g. it's disallowed
-// to call noteclear straight after notewakeup.
-//
-// notetsleep is like notesleep but wakes up after
-// a given number of nanoseconds even if the event
-// has not yet happened.  if a goroutine uses notetsleep to
-// wake up early, it must wait to call noteclear until it
-// can be sure that no other goroutine is calling
-// notewakeup.
-//
-// notesleep/notetsleep are generally called on g0,
-// notetsleepg is similar to notetsleep but is called on user g.
-type note struct {
-	// Futex-based impl treats it as uint32 key,
-	// while sema-based impl as M* waitm.
-	// Used to be a union, but unions break precise GC.
-	key uintptr
-}
-
 type funcval struct {
 	fn uintptr
 	// variable-size, fn-specific data here
@@ -493,6 +467,7 @@ type g struct {
 	trackingStamp int64 // timestamp of when the G last started being tracked
 	runnableTime  int64 // the amount of time spent runnable, cleared when running, only used when tracking
 	lockedm       muintptr
+	fipsIndicator uint8
 	sig           uint32
 	writebuf      []byte
 	sigcode0      uintptr
@@ -514,7 +489,8 @@ type g struct {
 	// current in-progress goroutine profile
 	goroutineProfiled goroutineProfileStateHolder
 
-	coroarg *coro // argument during coroutine transfers
+	coroarg   *coro // argument during coroutine transfers
+	syncGroup *synctestGroup
 
 	// Per-G tracer state.
 	trace gTraceState
@@ -597,7 +573,7 @@ type m struct {
 	createstack     [32]uintptr // stack that created this thread, it's used for StackRecord.Stack0, so it must align with it.
 	lockedExt       uint32      // tracking for external LockOSThread
 	lockedInt       uint32      // tracking for internal lockOSThread
-	nextwaitm       muintptr    // next m waiting for lock
+	mWaitList       mWaitList   // list of runtime lock waiters
 
 	mLockProfile mLockProfile // fields relating to runtime.lock contention
 	profStack    []uintptr    // used for memory/block/mutex stack traces
@@ -645,6 +621,12 @@ type m struct {
 	// Up to 10 locks held by this m, maintained by the lock ranking code.
 	locksHeldLen int
 	locksHeld    [10]heldLockInfo
+
+	// Size the runtime.m structure so it fits in the 2048-byte size class, and
+	// not in the next-smallest (1792-byte) size class. That leaves the 11 low
+	// bits of muintptr values available for flags, as required for
+	// GOEXPERIMENT=spinbitmutex.
+	_ [goexperiment.SpinbitMutexInt * 700 * (2 - goarch.PtrSize/4)]byte
 }
 
 type p struct {
@@ -1083,6 +1065,7 @@ const (
 	waitReasonSyncMutexLock                           // "sync.Mutex.Lock"
 	waitReasonSyncRWMutexRLock                        // "sync.RWMutex.RLock"
 	waitReasonSyncRWMutexLock                         // "sync.RWMutex.Lock"
+	waitReasonSyncWaitGroupWait                       // "sync.WaitGroup.Wait"
 	waitReasonTraceReaderBlocked                      // "trace reader (blocked)"
 	waitReasonWaitForGCCycle                          // "wait for GC cycle"
 	waitReasonGCWorkerIdle                            // "GC worker (idle)"
@@ -1097,6 +1080,11 @@ const (
 	waitReasonPageTraceFlush                          // "page trace flush"
 	waitReasonCoroutine                               // "coroutine"
 	waitReasonGCWeakToStrongWait                      // "GC weak to strong wait"
+	waitReasonSynctestRun                             // "synctest.Run"
+	waitReasonSynctestWait                            // "synctest.Wait"
+	waitReasonSynctestChanReceive                     // "chan receive (synctest)"
+	waitReasonSynctestChanSend                        // "chan send (synctest)"
+	waitReasonSynctestSelect                          // "select (synctest)"
 )
 
 var waitReasonStrings = [...]string{
@@ -1124,6 +1112,7 @@ var waitReasonStrings = [...]string{
 	waitReasonSyncMutexLock:         "sync.Mutex.Lock",
 	waitReasonSyncRWMutexRLock:      "sync.RWMutex.RLock",
 	waitReasonSyncRWMutexLock:       "sync.RWMutex.Lock",
+	waitReasonSyncWaitGroupWait:     "sync.WaitGroup.Wait",
 	waitReasonTraceReaderBlocked:    "trace reader (blocked)",
 	waitReasonWaitForGCCycle:        "wait for GC cycle",
 	waitReasonGCWorkerIdle:          "GC worker (idle)",
@@ -1138,6 +1127,11 @@ var waitReasonStrings = [...]string{
 	waitReasonPageTraceFlush:        "page trace flush",
 	waitReasonCoroutine:             "coroutine",
 	waitReasonGCWeakToStrongWait:    "GC weak to strong wait",
+	waitReasonSynctestRun:           "synctest.Run",
+	waitReasonSynctestWait:          "synctest.Wait",
+	waitReasonSynctestChanReceive:   "chan receive (synctest)",
+	waitReasonSynctestChanSend:      "chan send (synctest)",
+	waitReasonSynctestSelect:        "select (synctest)",
 }
 
 func (w waitReason) String() string {
@@ -1176,6 +1170,26 @@ var isWaitingForGC = [len(waitReasonStrings)]bool{
 	waitReasonFlushProcCaches:       true,
 }
 
+func (w waitReason) isIdleInSynctest() bool {
+	return isIdleInSynctest[w]
+}
+
+// isIdleInSynctest indicates that a goroutine is considered idle by synctest.Wait.
+var isIdleInSynctest = [len(waitReasonStrings)]bool{
+	waitReasonChanReceiveNilChan:  true,
+	waitReasonChanSendNilChan:     true,
+	waitReasonSelectNoCases:       true,
+	waitReasonSleep:               true,
+	waitReasonSyncCondWait:        true,
+	waitReasonSyncWaitGroupWait:   true,
+	waitReasonCoroutine:           true,
+	waitReasonSynctestRun:         true,
+	waitReasonSynctestWait:        true,
+	waitReasonSynctestChanReceive: true,
+	waitReasonSynctestChanSend:    true,
+	waitReasonSynctestSelect:      true,
+}
+
 var (
 	allm       *m
 	gomaxprocs int32
diff --git a/src/runtime/runtime_test.go b/src/runtime/runtime_test.go
index c1bf7f87..f23581ac 100644
--- a/src/runtime/runtime_test.go
+++ b/src/runtime/runtime_test.go
@@ -7,7 +7,10 @@ package runtime_test
 import (
 	"flag"
 	"fmt"
+	"internal/cpu"
+	"internal/runtime/atomic"
 	"io"
+	"math/bits"
 	. "runtime"
 	"runtime/debug"
 	"slices"
@@ -539,3 +542,280 @@ func TestTimediv(t *testing.T) {
 		})
 	}
 }
+
+func BenchmarkProcYield(b *testing.B) {
+	benchN := func(n uint32) func(*testing.B) {
+		return func(b *testing.B) {
+			for i := 0; i < b.N; i++ {
+				ProcYield(n)
+			}
+		}
+	}
+
+	b.Run("1", benchN(1))
+	b.Run("10", benchN(10))
+	b.Run("30", benchN(30)) // active_spin_cnt in lock_sema.go and lock_futex.go
+	b.Run("100", benchN(100))
+	b.Run("1000", benchN(1000))
+}
+
+func BenchmarkOSYield(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		OSYield()
+	}
+}
+
+func BenchmarkMutexContention(b *testing.B) {
+	// Measure throughput of a single mutex with all threads contending
+	//
+	// Share a single counter across all threads. Progress from any thread is
+	// progress for the benchmark as a whole. We don't measure or give points
+	// for fairness here, arbitrary delay to any given thread's progress is
+	// invisible and allowed.
+	//
+	// The cache line that holds the count value will need to move between
+	// processors, but not as often as the cache line that holds the mutex. The
+	// mutex protects access to the count value, which limits contention on that
+	// cache line. This is a simple design, but it helps to make the behavior of
+	// the benchmark clear. Most real uses of mutex will protect some number of
+	// cache lines anyway.
+
+	var state struct {
+		_     cpu.CacheLinePad
+		lock  Mutex
+		_     cpu.CacheLinePad
+		count atomic.Int64
+		_     cpu.CacheLinePad
+	}
+
+	procs := GOMAXPROCS(0)
+	var wg sync.WaitGroup
+	for range procs {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			for {
+				Lock(&state.lock)
+				ours := state.count.Add(1)
+				Unlock(&state.lock)
+				if ours >= int64(b.N) {
+					return
+				}
+			}
+		}()
+	}
+	wg.Wait()
+}
+
+func BenchmarkMutexCapture(b *testing.B) {
+
+	// Measure mutex fairness.
+	//
+	// Have several threads contend for a single mutex value. Measure how
+	// effectively a single thread is able to capture the lock and report the
+	// duration of those "streak" events. Measure how long other individual
+	// threads need to wait between their turns with the lock. Report the
+	// duration of those "starve" events.
+	//
+	// Report in terms of wall clock time (assuming a constant time per
+	// lock/unlock pair) rather than number of locks/unlocks. This keeps
+	// timekeeping overhead out of the critical path, and avoids giving an
+	// advantage to lock/unlock implementations that take less time per
+	// operation.
+
+	var state struct {
+		_     cpu.CacheLinePad
+		lock  Mutex
+		_     cpu.CacheLinePad
+		count atomic.Int64
+		_     cpu.CacheLinePad
+	}
+
+	procs := GOMAXPROCS(0)
+	var wg sync.WaitGroup
+	histograms := make(chan [2][65]int)
+	for range procs {
+		wg.Add(1)
+		go func() {
+			var (
+				prev      int64
+				streak    int64
+				histogram [2][65]int
+			)
+			for {
+				Lock(&state.lock)
+				ours := state.count.Add(1)
+				Unlock(&state.lock)
+				delta := ours - prev - 1
+				prev = ours
+				if delta == 0 {
+					streak++
+				} else {
+					histogram[0][bits.LeadingZeros64(uint64(streak))]++
+					histogram[1][bits.LeadingZeros64(uint64(delta))]++
+					streak = 1
+				}
+				if ours >= int64(b.N) {
+					wg.Done()
+					if delta == 0 {
+						histogram[0][bits.LeadingZeros64(uint64(streak))]++
+						histogram[1][bits.LeadingZeros64(uint64(delta))]++
+					}
+					histograms <- histogram
+					return
+				}
+			}
+		}()
+	}
+
+	wg.Wait()
+	b.StopTimer()
+
+	var histogram [2][65]int
+	for range procs {
+		h := <-histograms
+		for i := range h {
+			for j := range h[i] {
+				histogram[i][j] += h[i][j]
+			}
+		}
+	}
+
+	percentile := func(h [65]int, p float64) int {
+		sum := 0
+		for i, v := range h {
+			bound := uint64(1<<63) >> i
+			sum += int(bound) * v
+		}
+
+		// Imagine that the longest streak / starvation events were instead half
+		// as long but twice in number. (Note that we've pre-multiplied by the
+		// [lower] "bound" value.) Continue those splits until we meet the
+		// percentile target.
+		part := 0
+		for i, v := range h {
+			bound := uint64(1<<63) >> i
+			part += int(bound) * v
+			// have we trimmed off enough at the head to dip below the percentile goal
+			if float64(sum-part) < float64(sum)*p {
+				return int(bound)
+			}
+		}
+
+		return 0
+	}
+
+	perOp := float64(b.Elapsed().Nanoseconds()) / float64(b.N)
+	b.ReportMetric(perOp*float64(percentile(histogram[0], 1.0)), "ns/streak-p100")
+	b.ReportMetric(perOp*float64(percentile(histogram[0], 0.9)), "ns/streak-p90")
+	b.ReportMetric(perOp*float64(percentile(histogram[1], 1.0)), "ns/starve-p100")
+	b.ReportMetric(perOp*float64(percentile(histogram[1], 0.9)), "ns/starve-p90")
+}
+
+func BenchmarkMutexHandoff(b *testing.B) {
+	testcase := func(delay func(l *Mutex)) func(b *testing.B) {
+		return func(b *testing.B) {
+			if workers := 2; GOMAXPROCS(0) < workers {
+				b.Skipf("requires GOMAXPROCS >= %d", workers)
+			}
+
+			// Measure latency of mutex handoff between threads.
+			//
+			// Hand off a runtime.mutex between two threads, one running a
+			// "coordinator" goroutine and the other running a "worker"
+			// goroutine. We don't override the runtime's typical
+			// goroutine/thread mapping behavior.
+			//
+			// Measure the latency, starting when the coordinator enters a call
+			// to runtime.unlock and ending when the worker's call to
+			// runtime.lock returns. The benchmark can specify a "delay"
+			// function to simulate the length of the mutex-holder's critical
+			// section, including to arrange for the worker's thread to be in
+			// either the "spinning" or "sleeping" portions of the runtime.lock2
+			// implementation. Measurement starts after any such "delay".
+			//
+			// The two threads' goroutines communicate their current position to
+			// each other in a non-blocking way via the "turn" state.
+
+			var state struct {
+				_    cpu.CacheLinePad
+				lock Mutex
+				_    cpu.CacheLinePad
+				turn atomic.Int64
+				_    cpu.CacheLinePad
+			}
+
+			var delta atomic.Int64
+			var wg sync.WaitGroup
+
+			// coordinator:
+			//  - acquire the mutex
+			//  - set the turn to 2 mod 4, instructing the worker to begin its Lock call
+			//  - wait until the mutex is contended
+			//  - wait a bit more so the worker can commit to its sleep
+			//  - release the mutex and wait for it to be our turn (0 mod 4) again
+			wg.Add(1)
+			go func() {
+				defer wg.Done()
+				var t int64
+				for range b.N {
+					Lock(&state.lock)
+					state.turn.Add(2)
+					delay(&state.lock)
+					t -= Nanotime() // start the timer
+					Unlock(&state.lock)
+					for state.turn.Load()&0x2 != 0 {
+					}
+				}
+				state.turn.Add(1)
+				delta.Add(t)
+			}()
+
+			// worker:
+			//  - wait until its our turn (2 mod 4)
+			//  - acquire and release the mutex
+			//  - switch the turn counter back to the coordinator (0 mod 4)
+			wg.Add(1)
+			go func() {
+				defer wg.Done()
+				var t int64
+				for {
+					switch state.turn.Load() & 0x3 {
+					case 0:
+					case 1, 3:
+						delta.Add(t)
+						return
+					case 2:
+						Lock(&state.lock)
+						t += Nanotime() // stop the timer
+						Unlock(&state.lock)
+						state.turn.Add(2)
+					}
+				}
+			}()
+
+			wg.Wait()
+			b.ReportMetric(float64(delta.Load())/float64(b.N), "ns/op")
+		}
+	}
+
+	b.Run("Solo", func(b *testing.B) {
+		var lock Mutex
+		for range b.N {
+			Lock(&lock)
+			Unlock(&lock)
+		}
+	})
+
+	b.Run("FastPingPong", testcase(func(l *Mutex) {}))
+	b.Run("SlowPingPong", testcase(func(l *Mutex) {
+		// Wait for the worker to stop spinning and prepare to sleep
+		for !MutexContended(l) {
+		}
+		// Wait a bit longer so the OS can finish committing the worker to its
+		// sleep. Balance consistency against getting enough iterations.
+		const extraNs = 10e3
+		for t0 := Nanotime(); Nanotime()-t0 < extraNs; {
+		}
+	}))
+}
diff --git a/src/runtime/select.go b/src/runtime/select.go
index 17c49d74..0b1d1449 100644
--- a/src/runtime/select.go
+++ b/src/runtime/select.go
@@ -8,6 +8,7 @@ package runtime
 
 import (
 	"internal/abi"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
@@ -27,7 +28,7 @@ var (
 )
 
 func selectsetpc(pc *uintptr) {
-	*pc = getcallerpc()
+	*pc = sys.GetCallerPC()
 }
 
 func sellock(scases []scase, lockorder []uint16) {
@@ -119,6 +120,7 @@ func block() {
 // Also, if the chosen scase was a receive operation, it reports whether
 // a value was received.
 func selectgo(cas0 *scase, order0 *uint16, pc0 *uintptr, nsends, nrecvs int, block bool) (int, bool) {
+	gp := getg()
 	if debugSelect {
 		print("select: cas0=", cas0, "\n")
 	}
@@ -164,6 +166,7 @@ func selectgo(cas0 *scase, order0 *uint16, pc0 *uintptr, nsends, nrecvs int, blo
 
 	// generate permuted order
 	norder := 0
+	allSynctest := true
 	for i := range scases {
 		cas := &scases[i]
 
@@ -173,6 +176,14 @@ func selectgo(cas0 *scase, order0 *uint16, pc0 *uintptr, nsends, nrecvs int, blo
 			continue
 		}
 
+		if cas.c.synctest {
+			if getg().syncGroup == nil {
+				panic(plainError("select on synctest channel from outside bubble"))
+			}
+		} else {
+			allSynctest = false
+		}
+
 		if cas.c.timer != nil {
 			cas.c.timer.maybeRunChan()
 		}
@@ -185,6 +196,13 @@ func selectgo(cas0 *scase, order0 *uint16, pc0 *uintptr, nsends, nrecvs int, blo
 	pollorder = pollorder[:norder]
 	lockorder = lockorder[:norder]
 
+	waitReason := waitReasonSelect
+	if gp.syncGroup != nil && allSynctest {
+		// Every channel selected on is in a synctest bubble,
+		// so this goroutine will count as idle while selecting.
+		waitReason = waitReasonSynctestSelect
+	}
+
 	// sort the cases by Hchan address to get the locking order.
 	// simple heap sort, to guarantee n log n time and constant stack footprint.
 	for i := range lockorder {
@@ -234,7 +252,6 @@ func selectgo(cas0 *scase, order0 *uint16, pc0 *uintptr, nsends, nrecvs int, blo
 	sellock(scases, lockorder)
 
 	var (
-		gp     *g
 		sg     *sudog
 		c      *hchan
 		k      *scase
@@ -290,7 +307,6 @@ func selectgo(cas0 *scase, order0 *uint16, pc0 *uintptr, nsends, nrecvs int, blo
 	}
 
 	// pass 2 - enqueue on all chans
-	gp = getg()
 	if gp.waiting != nil {
 		throw("gp.waiting != nil")
 	}
@@ -332,7 +348,7 @@ func selectgo(cas0 *scase, order0 *uint16, pc0 *uintptr, nsends, nrecvs int, blo
 	// changes and when we set gp.activeStackChans is not safe for
 	// stack shrinking.
 	gp.parkingOnChan.Store(true)
-	gopark(selparkcommit, nil, waitReasonSelect, traceBlockSelect, 1)
+	gopark(selparkcommit, nil, waitReason, traceBlockSelect, 1)
 	gp.activeStackChans = false
 
 	sellock(scases, lockorder)
diff --git a/src/runtime/sema.go b/src/runtime/sema.go
index f6b1b84f..18ada5a6 100644
--- a/src/runtime/sema.go
+++ b/src/runtime/sema.go
@@ -90,8 +90,8 @@ func sync_runtime_Semrelease(addr *uint32, handoff bool, skipframes int) {
 	semrelease1(addr, handoff, skipframes)
 }
 
-//go:linkname sync_runtime_SemacquireMutex sync.runtime_SemacquireMutex
-func sync_runtime_SemacquireMutex(addr *uint32, lifo bool, skipframes int) {
+//go:linkname internal_sync_runtime_SemacquireMutex internal/sync.runtime_SemacquireMutex
+func internal_sync_runtime_SemacquireMutex(addr *uint32, lifo bool, skipframes int) {
 	semacquire1(addr, lifo, semaBlockProfile|semaMutexProfile, skipframes, waitReasonSyncMutexLock)
 }
 
@@ -105,11 +105,21 @@ func sync_runtime_SemacquireRWMutex(addr *uint32, lifo bool, skipframes int) {
 	semacquire1(addr, lifo, semaBlockProfile|semaMutexProfile, skipframes, waitReasonSyncRWMutexLock)
 }
 
+//go:linkname sync_runtime_SemacquireWaitGroup sync.runtime_SemacquireWaitGroup
+func sync_runtime_SemacquireWaitGroup(addr *uint32) {
+	semacquire1(addr, false, semaBlockProfile, 0, waitReasonSyncWaitGroupWait)
+}
+
 //go:linkname poll_runtime_Semrelease internal/poll.runtime_Semrelease
 func poll_runtime_Semrelease(addr *uint32) {
 	semrelease(addr)
 }
 
+//go:linkname internal_sync_runtime_Semrelease internal/sync.runtime_Semrelease
+func internal_sync_runtime_Semrelease(addr *uint32, handoff bool, skipframes int) {
+	semrelease1(addr, handoff, skipframes)
+}
+
 func readyWithTime(s *sudog, traceskip int) {
 	if s.releasetime != 0 {
 		s.releasetime = cputicks()
@@ -619,6 +629,10 @@ func notifyListNotifyAll(l *notifyList) {
 	for s != nil {
 		next := s.next
 		s.next = nil
+		if s.g.syncGroup != nil && getg().syncGroup != s.g.syncGroup {
+			println("semaphore wake of synctest goroutine", s.g.goid, "from outside bubble")
+			panic("semaphore wake of synctest goroutine from outside bubble")
+		}
 		readyWithTime(s, 4)
 		s = next
 	}
@@ -672,6 +686,10 @@ func notifyListNotifyOne(l *notifyList) {
 			}
 			unlock(&l.lock)
 			s.next = nil
+			if s.g.syncGroup != nil && getg().syncGroup != s.g.syncGroup {
+				println("semaphore wake of synctest goroutine", s.g.goid, "from outside bubble")
+				panic("semaphore wake of synctest goroutine from outside bubble")
+			}
 			readyWithTime(s, 4)
 			return
 		}
@@ -687,7 +705,7 @@ func notifyListCheck(sz uintptr) {
 	}
 }
 
-//go:linkname sync_nanotime sync.runtime_nanotime
-func sync_nanotime() int64 {
+//go:linkname internal_sync_nanotime internal/sync.runtime_nanotime
+func internal_sync_nanotime() int64 {
 	return nanotime()
 }
diff --git a/src/runtime/signal_arm64.go b/src/runtime/signal_arm64.go
index 4a96b3c2..af7d29f9 100644
--- a/src/runtime/signal_arm64.go
+++ b/src/runtime/signal_arm64.go
@@ -9,7 +9,7 @@ package runtime
 import (
 	"internal/abi"
 	"internal/goarch"
-	"runtime/internal/sys"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
diff --git a/src/runtime/signal_linux_s390x.go b/src/runtime/signal_linux_s390x.go
index 18c3b115..54e9d1fb 100644
--- a/src/runtime/signal_linux_s390x.go
+++ b/src/runtime/signal_linux_s390x.go
@@ -7,7 +7,7 @@ package runtime
 import (
 	"internal/abi"
 	"internal/goarch"
-	"runtime/internal/sys"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
diff --git a/src/runtime/signal_loong64.go b/src/runtime/signal_loong64.go
index ac842c0c..970af01c 100644
--- a/src/runtime/signal_loong64.go
+++ b/src/runtime/signal_loong64.go
@@ -53,9 +53,10 @@ func dumpregs(c *sigctxt) {
 //go:nowritebarrierrec
 func (c *sigctxt) sigpc() uintptr { return uintptr(c.pc()) }
 
-func (c *sigctxt) sigsp() uintptr { return uintptr(c.sp()) }
-func (c *sigctxt) siglr() uintptr { return uintptr(c.link()) }
-func (c *sigctxt) fault() uintptr { return uintptr(c.sigaddr()) }
+func (c *sigctxt) setsigpc(x uint64) { c.set_pc(x) }
+func (c *sigctxt) sigsp() uintptr    { return uintptr(c.sp()) }
+func (c *sigctxt) siglr() uintptr    { return uintptr(c.link()) }
+func (c *sigctxt) fault() uintptr    { return uintptr(c.sigaddr()) }
 
 // preparePanic sets up the stack to look like a call to sigpanic.
 func (c *sigctxt) preparePanic(sig uint32, gp *g) {
diff --git a/src/runtime/signal_mipsx.go b/src/runtime/signal_mipsx.go
index ba926551..924e654c 100644
--- a/src/runtime/signal_mipsx.go
+++ b/src/runtime/signal_mipsx.go
@@ -8,7 +8,7 @@ package runtime
 
 import (
 	"internal/abi"
-	"runtime/internal/sys"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
diff --git a/src/runtime/signal_ppc64x.go b/src/runtime/signal_ppc64x.go
index b5722f99..20f874c2 100644
--- a/src/runtime/signal_ppc64x.go
+++ b/src/runtime/signal_ppc64x.go
@@ -8,7 +8,7 @@ package runtime
 
 import (
 	"internal/abi"
-	"runtime/internal/sys"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
diff --git a/src/runtime/signal_unix.go b/src/runtime/signal_unix.go
index 6f40f440..96628d6b 100644
--- a/src/runtime/signal_unix.go
+++ b/src/runtime/signal_unix.go
@@ -9,7 +9,7 @@ package runtime
 import (
 	"internal/abi"
 	"internal/runtime/atomic"
-	"runtime/internal/sys"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
@@ -405,7 +405,7 @@ func sigFetchG(c *sigctxt) *g {
 			// bottom of the signal stack. Fetch from there.
 			// TODO: in efence mode, stack is sysAlloc'd, so this wouldn't
 			// work.
-			sp := getcallersp()
+			sp := sys.GetCallerSP()
 			s := spanOf(sp)
 			if s != nil && s.state.get() == mSpanManual && s.base() < sp && sp < s.limit {
 				gp := *(**g)(unsafe.Pointer(s.base()))
@@ -479,7 +479,7 @@ func sigtrampgo(sig uint32, info *siginfo, ctx unsafe.Pointer) {
 	var gsignalStack gsignalStack
 	setStack := adjustSignalStack(sig, gp.m, &gsignalStack)
 	if setStack {
-		gp.m.gsignal.stktopsp = getcallersp()
+		gp.m.gsignal.stktopsp = sys.GetCallerSP()
 	}
 
 	if gp.stackguard0 == stackFork {
@@ -584,15 +584,23 @@ func adjustSignalStack(sig uint32, mp *m, gsigStack *gsignalStack) bool {
 	}
 
 	// sp is not within gsignal stack, g0 stack, or sigaltstack. Bad.
+	// Call indirectly to avoid nosplit stack overflow on OpenBSD.
+	adjustSignalStack2Indirect(sig, sp, mp, st.ss_flags&_SS_DISABLE != 0)
+	return false
+}
+
+var adjustSignalStack2Indirect = adjustSignalStack2
+
+//go:nosplit
+func adjustSignalStack2(sig uint32, sp uintptr, mp *m, ssDisable bool) {
 	setg(nil)
 	needm(true)
-	if st.ss_flags&_SS_DISABLE != 0 {
+	if ssDisable {
 		noSignalStack(sig)
 	} else {
 		sigNotOnStack(sig, sp, mp)
 	}
 	dropm()
-	return false
 }
 
 // crashing is the number of m's we have waited for when implementing
diff --git a/src/runtime/signal_windows.go b/src/runtime/signal_windows.go
index 4b7960c1..b0c653ee 100644
--- a/src/runtime/signal_windows.go
+++ b/src/runtime/signal_windows.go
@@ -6,7 +6,7 @@ package runtime
 
 import (
 	"internal/abi"
-	"runtime/internal/sys"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
diff --git a/src/runtime/sizeof_test.go b/src/runtime/sizeof_test.go
index 43aba98d..a5dc8aed 100644
--- a/src/runtime/sizeof_test.go
+++ b/src/runtime/sizeof_test.go
@@ -20,7 +20,7 @@ func TestSizeof(t *testing.T) {
 		_32bit uintptr // size on 32bit platforms
 		_64bit uintptr // size on 64bit platforms
 	}{
-		{runtime.G{}, 272, 432},   // g, but exported for testing
+		{runtime.G{}, 280, 440},   // g, but exported for testing
 		{runtime.Sudog{}, 56, 88}, // sudog, but exported for testing
 	}
 
diff --git a/src/runtime/slice.go b/src/runtime/slice.go
index 78475735..79d3f6c0 100644
--- a/src/runtime/slice.go
+++ b/src/runtime/slice.go
@@ -7,8 +7,8 @@ package runtime
 import (
 	"internal/abi"
 	"internal/goarch"
-	"runtime/internal/math"
-	"runtime/internal/sys"
+	"internal/runtime/math"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
@@ -18,7 +18,7 @@ type slice struct {
 	cap   int
 }
 
-// A notInHeapSlice is a slice backed by runtime/internal/sys.NotInHeap memory.
+// A notInHeapSlice is a slice backed by internal/runtime/sys.NotInHeap memory.
 type notInHeapSlice struct {
 	array *notInHeap
 	len   int
@@ -73,7 +73,7 @@ func makeslicecopy(et *_type, tolen int, fromlen int, from unsafe.Pointer) unsaf
 	}
 
 	if raceenabled {
-		callerpc := getcallerpc()
+		callerpc := sys.GetCallerPC()
 		pc := abi.FuncPCABIInternal(makeslicecopy)
 		racereadrangepc(from, copymem, callerpc, pc)
 	}
@@ -177,7 +177,7 @@ func makeslice64(et *_type, len64, cap64 int64) unsafe.Pointer {
 func growslice(oldPtr unsafe.Pointer, newLen, oldCap, num int, et *_type) slice {
 	oldLen := newLen - num
 	if raceenabled {
-		callerpc := getcallerpc()
+		callerpc := sys.GetCallerPC()
 		racereadrangepc(oldPtr, uintptr(oldLen*int(et.Size_)), callerpc, abi.FuncPCABIInternal(growslice))
 	}
 	if msanenabled {
@@ -368,7 +368,7 @@ func slicecopy(toPtr unsafe.Pointer, toLen int, fromPtr unsafe.Pointer, fromLen
 
 	size := uintptr(n) * width
 	if raceenabled {
-		callerpc := getcallerpc()
+		callerpc := sys.GetCallerPC()
 		pc := abi.FuncPCABIInternal(slicecopy)
 		racereadrangepc(fromPtr, size, callerpc, pc)
 		racewriterangepc(toPtr, size, callerpc, pc)
diff --git a/src/runtime/stack.go b/src/runtime/stack.go
index d43c6ace..8f11f54c 100644
--- a/src/runtime/stack.go
+++ b/src/runtime/stack.go
@@ -10,7 +10,7 @@ import (
 	"internal/goarch"
 	"internal/goos"
 	"internal/runtime/atomic"
-	"runtime/internal/sys"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
@@ -416,7 +416,7 @@ func stackalloc(n uint32) stack {
 	}
 
 	if traceAllocFreeEnabled() {
-		trace := traceTryAcquire()
+		trace := traceAcquire()
 		if trace.ok() {
 			trace.GoroutineStackAlloc(uintptr(v), uintptr(n))
 			traceRelease(trace)
@@ -466,7 +466,7 @@ func stackfree(stk stack) {
 		return
 	}
 	if traceAllocFreeEnabled() {
-		trace := traceTryAcquire()
+		trace := traceAcquire()
 		if trace.ok() {
 			trace.GoroutineStackFree(uintptr(v))
 			traceRelease(trace)
@@ -722,22 +722,12 @@ func adjustframe(frame *stkframe, adjinfo *adjustinfo) {
 				// we call into morestack.)
 				continue
 			}
-			ptrdata := obj.ptrdata()
-			gcdata := obj.gcdata()
-			var s *mspan
-			if obj.useGCProg() {
-				// See comments in mgcmark.go:scanstack
-				s = materializeGCProg(ptrdata, gcdata)
-				gcdata = (*byte)(unsafe.Pointer(s.startAddr))
-			}
-			for i := uintptr(0); i < ptrdata; i += goarch.PtrSize {
-				if *addb(gcdata, i/(8*goarch.PtrSize))>>(i/goarch.PtrSize&7)&1 != 0 {
+			ptrBytes, gcData := obj.gcdata()
+			for i := uintptr(0); i < ptrBytes; i += goarch.PtrSize {
+				if *addb(gcData, i/(8*goarch.PtrSize))>>(i/goarch.PtrSize&7)&1 != 0 {
 					adjustpointer(adjinfo, unsafe.Pointer(p+i))
 				}
 			}
-			if s != nil {
-				dematerializeGCProg(s)
-			}
 		}
 	}
 }
@@ -1288,24 +1278,14 @@ type stackObjectRecord struct {
 	// if non-negative, offset from argp
 	off       int32
 	size      int32
-	_ptrdata  int32  // ptrdata, or -ptrdata is GC prog is used
+	ptrBytes  int32
 	gcdataoff uint32 // offset to gcdata from moduledata.rodata
 }
 
-func (r *stackObjectRecord) useGCProg() bool {
-	return r._ptrdata < 0
-}
-
-func (r *stackObjectRecord) ptrdata() uintptr {
-	x := r._ptrdata
-	if x < 0 {
-		return uintptr(-x)
-	}
-	return uintptr(x)
-}
-
-// gcdata returns pointer map or GC prog of the type.
-func (r *stackObjectRecord) gcdata() *byte {
+// gcdata returns the number of bytes that contain pointers, and
+// a ptr/nonptr bitmask covering those bytes.
+// Note that this bitmask might be larger than internal/abi.MaxPtrmaskBytes.
+func (r *stackObjectRecord) gcdata() (uintptr, *byte) {
 	ptr := uintptr(unsafe.Pointer(r))
 	var mod *moduledata
 	for datap := &firstmoduledata; datap != nil; datap = datap.next {
@@ -1318,7 +1298,7 @@ func (r *stackObjectRecord) gcdata() *byte {
 	// you may have made a copy of a stackObjectRecord.
 	// You must use the original pointer.
 	res := mod.rodata + uintptr(r.gcdataoff)
-	return (*byte)(unsafe.Pointer(res))
+	return uintptr(r.ptrBytes), (*byte)(unsafe.Pointer(res))
 }
 
 // This is exported as ABI0 via linkname so obj can call it.
diff --git a/src/runtime/stkframe.go b/src/runtime/stkframe.go
index 42b69477..819b7f6c 100644
--- a/src/runtime/stkframe.go
+++ b/src/runtime/stkframe.go
@@ -7,7 +7,7 @@ package runtime
 import (
 	"internal/abi"
 	"internal/goarch"
-	"runtime/internal/sys"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
@@ -264,9 +264,6 @@ var methodValueCallFrameObjs [1]stackObjectRecord // initialized in stackobjecti
 func stkobjinit() {
 	var abiRegArgsEface any = abi.RegArgs{}
 	abiRegArgsType := efaceOf(&abiRegArgsEface)._type
-	if abiRegArgsType.Kind_&abi.KindGCProg != 0 {
-		throw("abiRegArgsType needs GC Prog, update methodValueCallFrameObjs")
-	}
 	// Set methodValueCallFrameObjs[0].gcdataoff so that
 	// stackObjectRecord.gcdata() will work correctly with it.
 	ptr := uintptr(unsafe.Pointer(&methodValueCallFrameObjs[0]))
@@ -283,7 +280,7 @@ func stkobjinit() {
 	methodValueCallFrameObjs[0] = stackObjectRecord{
 		off:       -int32(alignUp(abiRegArgsType.Size_, 8)), // It's always the highest address local.
 		size:      int32(abiRegArgsType.Size_),
-		_ptrdata:  int32(abiRegArgsType.PtrBytes),
-		gcdataoff: uint32(uintptr(unsafe.Pointer(abiRegArgsType.GCData)) - mod.rodata),
+		ptrBytes:  int32(abiRegArgsType.PtrBytes),
+		gcdataoff: uint32(uintptr(unsafe.Pointer(getGCMask(abiRegArgsType))) - mod.rodata),
 	}
 }
diff --git a/src/runtime/string.go b/src/runtime/string.go
index 5bdb25b9..e43f4cca 100644
--- a/src/runtime/string.go
+++ b/src/runtime/string.go
@@ -8,6 +8,7 @@ import (
 	"internal/abi"
 	"internal/bytealg"
 	"internal/goarch"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
@@ -50,8 +51,8 @@ func concatstrings(buf *tmpBuf, a []string) string {
 	}
 	s, b := rawstringtmp(buf, l)
 	for _, x := range a {
-		copy(b, x)
-		b = b[len(x):]
+		n := copy(b, x)
+		b = b[n:]
 	}
 	return s
 }
@@ -72,22 +73,55 @@ func concatstring5(buf *tmpBuf, a0, a1, a2, a3, a4 string) string {
 	return concatstrings(buf, []string{a0, a1, a2, a3, a4})
 }
 
+// concatbytes implements a Go string concatenation x+y+z+... returning a slice
+// of bytes.
+// The operands are passed in the slice a.
+func concatbytes(a []string) []byte {
+	l := 0
+	for _, x := range a {
+		n := len(x)
+		if l+n < l {
+			throw("string concatenation too long")
+		}
+		l += n
+	}
+	if l == 0 {
+		// This is to match the return type of the non-optimized concatenation.
+		return []byte{}
+	}
+
+	b := rawbyteslice(l)
+	offset := 0
+	for _, x := range a {
+		copy(b[offset:], x)
+		offset += len(x)
+	}
+
+	return b
+}
+
+func concatbyte2(a0, a1 string) []byte {
+	return concatbytes([]string{a0, a1})
+}
+
+func concatbyte3(a0, a1, a2 string) []byte {
+	return concatbytes([]string{a0, a1, a2})
+}
+
+func concatbyte4(a0, a1, a2, a3 string) []byte {
+	return concatbytes([]string{a0, a1, a2, a3})
+}
+
+func concatbyte5(a0, a1, a2, a3, a4 string) []byte {
+	return concatbytes([]string{a0, a1, a2, a3, a4})
+}
+
 // slicebytetostring converts a byte slice to a string.
 // It is inserted by the compiler into generated code.
 // ptr is a pointer to the first element of the slice;
 // n is the length of the slice.
 // Buf is a fixed-size buffer for the result,
 // it is not nil if the result does not escape.
-//
-// slicebytetostring should be an internal detail,
-// but widely used packages access it using linkname.
-// Notable members of the hall of shame include:
-//   - github.com/cloudwego/frugal
-//
-// Do not remove or change the type signature.
-// See go.dev/issue/67401.
-//
-//go:linkname slicebytetostring
 func slicebytetostring(buf *tmpBuf, ptr *byte, n int) string {
 	if n == 0 {
 		// Turns out to be a relatively common case.
@@ -98,7 +132,7 @@ func slicebytetostring(buf *tmpBuf, ptr *byte, n int) string {
 	if raceenabled {
 		racereadrangepc(unsafe.Pointer(ptr),
 			uintptr(n),
-			getcallerpc(),
+			sys.GetCallerPC(),
 			abi.FuncPCABIInternal(slicebytetostring))
 	}
 	if msanenabled {
@@ -161,7 +195,7 @@ func slicebytetostringtmp(ptr *byte, n int) string {
 	if raceenabled && n > 0 {
 		racereadrangepc(unsafe.Pointer(ptr),
 			uintptr(n),
-			getcallerpc(),
+			sys.GetCallerPC(),
 			abi.FuncPCABIInternal(slicebytetostringtmp))
 	}
 	if msanenabled && n > 0 {
@@ -213,7 +247,7 @@ func slicerunetostring(buf *tmpBuf, a []rune) string {
 	if raceenabled && len(a) > 0 {
 		racereadrangepc(unsafe.Pointer(&a[0]),
 			uintptr(len(a))*unsafe.Sizeof(a[0]),
-			getcallerpc(),
+			sys.GetCallerPC(),
 			abi.FuncPCABIInternal(slicerunetostring))
 	}
 	if msanenabled && len(a) > 0 {
diff --git a/src/runtime/stubs.go b/src/runtime/stubs.go
index 2aeb4774..55153a20 100644
--- a/src/runtime/stubs.go
+++ b/src/runtime/stubs.go
@@ -97,7 +97,6 @@ func badsystemstack() {
 // Notable members of the hall of shame include:
 //   - github.com/bytedance/sonic
 //   - github.com/chenzhuoyu/iasm
-//   - github.com/cloudwego/frugal
 //   - github.com/dgraph-io/ristretto
 //   - github.com/outcaste-io/ristretto
 //
@@ -132,7 +131,6 @@ func reflect_memclrNoHeapPointers(ptr unsafe.Pointer, n uintptr) {
 // Notable members of the hall of shame include:
 //   - github.com/bytedance/sonic
 //   - github.com/cloudwego/dynamicgo
-//   - github.com/cloudwego/frugal
 //   - github.com/ebitengine/purego
 //   - github.com/tetratelabs/wazero
 //   - github.com/ugorji/go/codec
@@ -270,7 +268,7 @@ func reflectcall(stackArgsType *_type, fn, stackArgs unsafe.Pointer, stackArgsSi
 // Notable members of the hall of shame include:
 //   - github.com/sagernet/sing-tun
 //   - github.com/slackhq/nebula
-//   - github.com/tailscale/wireguard-go
+//   - golang.zx2c4.com/wireguard
 //
 // Do not remove or change the type signature.
 // See go.dev/issue/67401.
@@ -309,71 +307,11 @@ func goexit(neverCallThisFunction)
 // data dependency ordering.
 func publicationBarrier()
 
-// getcallerpc returns the program counter (PC) of its caller's caller.
-// getcallersp returns the stack pointer (SP) of its caller's caller.
-// The implementation may be a compiler intrinsic; there is not
-// necessarily code implementing this on every platform.
-//
-// For example:
-//
-//	func f(arg1, arg2, arg3 int) {
-//		pc := getcallerpc()
-//		sp := getcallersp()
-//	}
-//
-// These two lines find the PC and SP immediately following
-// the call to f (where f will return).
-//
-// The call to getcallerpc and getcallersp must be done in the
-// frame being asked about.
-//
-// The result of getcallersp is correct at the time of the return,
-// but it may be invalidated by any subsequent call to a function
-// that might relocate the stack in order to grow or shrink it.
-// A general rule is that the result of getcallersp should be used
-// immediately and can only be passed to nosplit functions.
-
-//go:noescape
-func getcallerpc() uintptr
-
-//go:noescape
-func getcallersp() uintptr // implemented as an intrinsic on all platforms
-
-// getclosureptr returns the pointer to the current closure.
-// getclosureptr can only be used in an assignment statement
-// at the entry of a function. Moreover, go:nosplit directive
-// must be specified at the declaration of caller function,
-// so that the function prolog does not clobber the closure register.
-// for example:
-//
-//	//go:nosplit
-//	func f(arg1, arg2, arg3 int) {
-//		dx := getclosureptr()
-//	}
-//
-// The compiler rewrites calls to this function into instructions that fetch the
-// pointer from a well-known register (DX on x86 architecture, etc.) directly.
-//
-// WARNING: PGO-based devirtualization cannot detect that caller of
-// getclosureptr require closure context, and thus must maintain a list of
-// these functions, which is in
-// cmd/compile/internal/devirtualize/pgo.maybeDevirtualizeFunctionCall.
-func getclosureptr() uintptr
-
 //go:noescape
 func asmcgocall(fn, arg unsafe.Pointer) int32
 
 func morestack()
 
-// morestack_noctxt should be an internal detail,
-// but widely used packages access it using linkname.
-// Notable members of the hall of shame include:
-//   - github.com/cloudwego/frugal
-//
-// Do not remove or change the type signature.
-// See go.dev/issue/67401.
-//
-//go:linkname morestack_noctxt
 func morestack_noctxt()
 
 func rt0_go()
@@ -433,6 +371,8 @@ func alignDown(n, a uintptr) uintptr {
 }
 
 // divRoundUp returns ceil(n / a).
+//
+//go:nosplit
 func divRoundUp(n, a uintptr) uintptr {
 	// a is generally a power of two. This will get inlined and
 	// the compiler will optimize the division.
@@ -465,7 +405,6 @@ func gcWriteBarrier1()
 // but widely used packages access it using linkname.
 // Notable members of the hall of shame include:
 //   - github.com/bytedance/sonic
-//   - github.com/cloudwego/frugal
 //
 // Do not remove or change the type signature.
 // See go.dev/issue/67401.
diff --git a/src/runtime/stubs_nonwasm.go b/src/runtime/stubs_nonwasm.go
new file mode 100644
index 00000000..fa4058bc
--- /dev/null
+++ b/src/runtime/stubs_nonwasm.go
@@ -0,0 +1,10 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build !wasm
+
+package runtime
+
+// pause is only used on wasm.
+func pause(newsp uintptr) { panic("unreachable") }
diff --git a/src/runtime/stubs_wasm.go b/src/runtime/stubs_wasm.go
new file mode 100644
index 00000000..fafc923b
--- /dev/null
+++ b/src/runtime/stubs_wasm.go
@@ -0,0 +1,16 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package runtime
+
+// pause sets SP to newsp and pauses the execution of Go's WebAssembly
+// code until an event is triggered, or call back into Go.
+//
+// Note: the epilogue of pause pops 8 bytes from the stack, so when
+// returning to the host, the SP is newsp+8.
+// If we want to set the SP such that when it calls back into Go, the
+// Go function appears to be called from pause's caller's caller, then
+// call pause with newsp = internal/runtime/sys.GetCallerSP()-16 (another 8 is
+// the return PC pushed to the stack).
+func pause(newsp uintptr)
diff --git a/src/runtime/symtab.go b/src/runtime/symtab.go
index 10cdcf9c..c3bd5103 100644
--- a/src/runtime/symtab.go
+++ b/src/runtime/symtab.go
@@ -8,7 +8,7 @@ import (
 	"internal/abi"
 	"internal/goarch"
 	"internal/runtime/atomic"
-	"runtime/internal/sys"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
@@ -49,7 +49,8 @@ type Frame struct {
 	// File and Line are the file name and line number of the
 	// location in this frame. For non-leaf frames, this will be
 	// the location of a call. These may be the empty string and
-	// zero, respectively, if not known.
+	// zero, respectively, if not known. The file name uses
+	// forward slashes, even on Windows.
 	File string
 	Line int
 
@@ -117,11 +118,16 @@ func (ci *Frames) Next() (frame Frame, more bool) {
 		}
 		f := funcInfo._Func()
 		entry := f.Entry()
+		// We store the pc of the start of the instruction following
+		// the instruction in question (the call or the inline mark).
+		// This is done for historical reasons, and to make FuncForPC
+		// work correctly for entries in the result of runtime.Callers.
+		// Decrement to get back to the instruction we care about.
+		//
+		// It is not possible to get pc == entry from runtime.Callers,
+		// but if the caller does provide one, provide best-effort
+		// results by avoiding backing out of the function entirely.
 		if pc > entry {
-			// We store the pc of the start of the instruction following
-			// the instruction in question (the call or the inline mark).
-			// This is done for historical reasons, and to make FuncForPC
-			// work correctly for entries in the result of runtime.Callers.
 			pc--
 		}
 		// It's important that interpret pc non-strictly as cgoTraceback may
@@ -462,17 +468,19 @@ type modulehash struct {
 // To make sure the map isn't collected, we keep a second reference here.
 var pinnedTypemaps []map[typeOff]*_type
 
-var firstmoduledata moduledata // linker symbol
+// aixStaticDataBase (used only on AIX) holds the unrelocated address
+// of the data section, set by the linker.
+//
+// On AIX, an R_ADDR relocation from an RODATA symbol to a DATA symbol
+// does not work, as the dynamic loader can change the address of the
+// data section, and it is not possible to apply a dynamic relocation
+// to RODATA. In order to get the correct address, we need to apply
+// the delta between unrelocated and relocated data section addresses.
+// aixStaticDataBase is the unrelocated address, and moduledata.data is
+// the relocated one.
+var aixStaticDataBase uintptr // linker symbol
 
-// lastmoduledatap should be an internal detail,
-// but widely used packages access it using linkname.
-// Notable members of the hall of shame include:
-//   - github.com/cloudwego/frugal
-//
-// Do not remove or change the type signature.
-// See go.dev/issue/67401.
-//
-//go:linkname lastmoduledatap
+var firstmoduledata moduledata  // linker symbol
 var lastmoduledatap *moduledata // linker symbol
 
 var modulesSlice *[]*moduledata // see activeModules
@@ -583,15 +591,6 @@ func moduledataverify() {
 
 const debugPcln = false
 
-// moduledataverify1 should be an internal detail,
-// but widely used packages access it using linkname.
-// Notable members of the hall of shame include:
-//   - github.com/cloudwego/frugal
-//
-// Do not remove or change the type signature.
-// See go.dev/issue/67401.
-//
-//go:linkname moduledataverify1
 func moduledataverify1(datap *moduledata) {
 	// Check that the pclntab's format is valid.
 	hdr := datap.pcHeader
@@ -713,22 +712,24 @@ func (md *moduledata) funcName(nameOff int32) string {
 	return gostringnocopy(&md.funcnametab[nameOff])
 }
 
-// FuncForPC returns a *[Func] describing the function that contains the
-// given program counter address, or else nil.
-//
-// If pc represents multiple functions because of inlining, it returns
-// the *Func describing the innermost function, but with an entry of
-// the outermost function.
-//
-// For completely unclear reasons, even though they can import runtime,
-// some widely used packages access this using linkname.
+// Despite being an exported symbol,
+// FuncForPC is linknamed by widely used packages.
 // Notable members of the hall of shame include:
 //   - gitee.com/quant1x/gox
 //
 // Do not remove or change the type signature.
 // See go.dev/issue/67401.
 //
+// Note that this comment is not part of the doc comment.
+//
 //go:linkname FuncForPC
+
+// FuncForPC returns a *[Func] describing the function that contains the
+// given program counter address, or else nil.
+//
+// If pc represents multiple functions because of inlining, it returns
+// the *Func describing the innermost function, but with an entry of
+// the outermost function.
 func FuncForPC(pc uintptr) *Func {
 	f := findfunc(pc)
 	if !f.valid() {
@@ -862,7 +863,6 @@ func badFuncInfoEntry(funcInfo) uintptr
 // findfunc should be an internal detail,
 // but widely used packages access it using linkname.
 // Notable members of the hall of shame include:
-//   - github.com/cloudwego/frugal
 //   - github.com/phuslu/log
 //
 // Do not remove or change the type signature.
@@ -1196,16 +1196,6 @@ func pcdatavalue1(f funcInfo, table uint32, targetpc uintptr, strict bool) int32
 }
 
 // Like pcdatavalue, but also return the start PC of this PCData value.
-//
-// pcdatavalue2 should be an internal detail,
-// but widely used packages access it using linkname.
-// Notable members of the hall of shame include:
-//   - github.com/cloudwego/frugal
-//
-// Do not remove or change the type signature.
-// See go.dev/issue/67401.
-//
-//go:linkname pcdatavalue2
 func pcdatavalue2(f funcInfo, table uint32, targetpc uintptr) (int32, uintptr) {
 	if table >= f.npcdata {
 		return -1, 0
@@ -1234,16 +1224,6 @@ func funcdata(f funcInfo, i uint8) unsafe.Pointer {
 }
 
 // step advances to the next pc, value pair in the encoded table.
-//
-// step should be an internal detail,
-// but widely used packages access it using linkname.
-// Notable members of the hall of shame include:
-//   - github.com/cloudwego/frugal
-//
-// Do not remove or change the type signature.
-// See go.dev/issue/67401.
-//
-//go:linkname step
 func step(p []byte, pc *uintptr, val *int32, first bool) (newp []byte, ok bool) {
 	// For both uvdelta and pcdelta, the common case (~70%)
 	// is that they are a single byte. If so, avoid calling readvarint.
@@ -1289,15 +1269,6 @@ type stackmap struct {
 	bytedata [1]byte // bitmaps, each starting on a byte boundary
 }
 
-// stackmapdata should be an internal detail,
-// but widely used packages access it using linkname.
-// Notable members of the hall of shame include:
-//   - github.com/cloudwego/frugal
-//
-// Do not remove or change the type signature.
-// See go.dev/issue/67401.
-//
-//go:linkname stackmapdata
 //go:nowritebarrier
 func stackmapdata(stkmap *stackmap, n int32) bitvector {
 	// Check this invariant only when stackDebug is on at all.
diff --git a/src/runtime/symtabinl_test.go b/src/runtime/symtabinl_test.go
index 3c7cb2e5..ab58c053 100644
--- a/src/runtime/symtabinl_test.go
+++ b/src/runtime/symtabinl_test.go
@@ -6,8 +6,8 @@ package runtime
 
 import (
 	"internal/abi"
+	"internal/runtime/sys"
 	"internal/stringslite"
-	"runtime/internal/sys"
 )
 
 func XTestInlineUnwinder(t TestingT) {
@@ -107,16 +107,17 @@ func lineNumber() int {
 // Below here is the test data for XTestInlineUnwinder
 
 var tiuStart = lineNumber() // +0
-var tiu1, tiu2, tiu3 int    // +1
-func tiuInlined1() { // +2
-	tiu1++ // +3
+var tiu2, tiu3 int          // +1
+func tiuInlined1(i int) { // +2
+	tiu1[i]++ // +3
 } // +4
 func tiuInlined2() { // +5
-	tiuInlined1() // +6
-	tiu2++        // +7
+	tiuInlined1(1) // +6
+	tiu2++         // +7
 } // +8
 func tiuTest() { // +9
-	tiuInlined1() // +10
-	tiuInlined2() // +11
-	tiu3++        // +12
-} // +13
+	tiuInlined1(0) // +10
+	tiuInlined2()  // +11
+	tiu3++         // +12
+}               // +13
+var tiu1 [2]int // +14
diff --git a/src/runtime/synctest.go b/src/runtime/synctest.go
new file mode 100644
index 00000000..498c3b92
--- /dev/null
+++ b/src/runtime/synctest.go
@@ -0,0 +1,301 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package runtime
+
+import (
+	"unsafe"
+)
+
+// A synctestGroup is a group of goroutines started by synctest.Run.
+type synctestGroup struct {
+	mu      mutex
+	timers  timers
+	now     int64 // current fake time
+	root    *g    // caller of synctest.Run
+	waiter  *g    // caller of synctest.Wait
+	waiting bool  // true if a goroutine is calling synctest.Wait
+
+	// The group is active (not blocked) so long as running > 0 || active > 0.
+	//
+	// running is the number of goroutines which are not "durably blocked":
+	// Goroutines which are either running, runnable, or non-durably blocked
+	// (for example, blocked in a syscall).
+	//
+	// active is used to keep the group from becoming blocked,
+	// even if all goroutines in the group are blocked.
+	// For example, park_m can choose to immediately unpark a goroutine after parking it.
+	// It increments the active count to keep the group active until it has determined
+	// that the park operation has completed.
+	total   int // total goroutines
+	running int // non-blocked goroutines
+	active  int // other sources of activity
+}
+
+// changegstatus is called when the non-lock status of a g changes.
+// It is never called with a Gscanstatus.
+func (sg *synctestGroup) changegstatus(gp *g, oldval, newval uint32) {
+	// Determine whether this change in status affects the idleness of the group.
+	// If this isn't a goroutine starting, stopping, durably blocking,
+	// or waking up after durably blocking, then return immediately without
+	// locking sg.mu.
+	//
+	// For example, stack growth (newstack) will changegstatus
+	// from _Grunning to _Gcopystack. This is uninteresting to synctest,
+	// but if stack growth occurs while sg.mu is held, we must not recursively lock.
+	totalDelta := 0
+	wasRunning := true
+	switch oldval {
+	case _Gdead:
+		wasRunning = false
+		totalDelta++
+	case _Gwaiting:
+		if gp.waitreason.isIdleInSynctest() {
+			wasRunning = false
+		}
+	}
+	isRunning := true
+	switch newval {
+	case _Gdead:
+		isRunning = false
+		totalDelta--
+	case _Gwaiting:
+		if gp.waitreason.isIdleInSynctest() {
+			isRunning = false
+		}
+	}
+	// It's possible for wasRunning == isRunning while totalDelta != 0;
+	// for example, if a new goroutine is created in a non-running state.
+	if wasRunning == isRunning && totalDelta == 0 {
+		return
+	}
+
+	lock(&sg.mu)
+	sg.total += totalDelta
+	if wasRunning != isRunning {
+		if isRunning {
+			sg.running++
+		} else {
+			sg.running--
+			if raceenabled && newval != _Gdead {
+				racereleasemergeg(gp, sg.raceaddr())
+			}
+		}
+	}
+	if sg.total < 0 {
+		fatal("total < 0")
+	}
+	if sg.running < 0 {
+		fatal("running < 0")
+	}
+	wake := sg.maybeWakeLocked()
+	unlock(&sg.mu)
+	if wake != nil {
+		goready(wake, 0)
+	}
+}
+
+// incActive increments the active-count for the group.
+// A group does not become durably blocked while the active-count is non-zero.
+func (sg *synctestGroup) incActive() {
+	lock(&sg.mu)
+	sg.active++
+	unlock(&sg.mu)
+}
+
+// decActive decrements the active-count for the group.
+func (sg *synctestGroup) decActive() {
+	lock(&sg.mu)
+	sg.active--
+	if sg.active < 0 {
+		throw("active < 0")
+	}
+	wake := sg.maybeWakeLocked()
+	unlock(&sg.mu)
+	if wake != nil {
+		goready(wake, 0)
+	}
+}
+
+// maybeWakeLocked returns a g to wake if the group is durably blocked.
+func (sg *synctestGroup) maybeWakeLocked() *g {
+	if sg.running > 0 || sg.active > 0 {
+		return nil
+	}
+	// Increment the group active count, since we've determined to wake something.
+	// The woken goroutine will decrement the count.
+	// We can't just call goready and let it increment sg.running,
+	// since we can't call goready with sg.mu held.
+	//
+	// Incrementing the active count here is only necessary if something has gone wrong,
+	// and a goroutine that we considered durably blocked wakes up unexpectedly.
+	// Two wakes happening at the same time leads to very confusing failure modes,
+	// so we take steps to avoid it happening.
+	sg.active++
+	if gp := sg.waiter; gp != nil {
+		// A goroutine is blocked in Wait. Wake it.
+		return gp
+	}
+	// All goroutines in the group are durably blocked, and nothing has called Wait.
+	// Wake the root goroutine.
+	return sg.root
+}
+
+func (sg *synctestGroup) raceaddr() unsafe.Pointer {
+	// Address used to record happens-before relationships created by the group.
+	//
+	// Wait creates a happens-before relationship between itself and
+	// the blocking operations which caused other goroutines in the group to park.
+	return unsafe.Pointer(sg)
+}
+
+//go:linkname synctestRun internal/synctest.Run
+func synctestRun(f func()) {
+	if debug.asynctimerchan.Load() != 0 {
+		panic("synctest.Run not supported with asynctimerchan!=0")
+	}
+
+	gp := getg()
+	if gp.syncGroup != nil {
+		panic("synctest.Run called from within a synctest bubble")
+	}
+	gp.syncGroup = &synctestGroup{
+		total:   1,
+		running: 1,
+		root:    gp,
+	}
+	const synctestBaseTime = 946684800000000000 // midnight UTC 2000-01-01
+	gp.syncGroup.now = synctestBaseTime
+	gp.syncGroup.timers.syncGroup = gp.syncGroup
+	lockInit(&gp.syncGroup.mu, lockRankSynctest)
+	lockInit(&gp.syncGroup.timers.mu, lockRankTimers)
+	defer func() {
+		gp.syncGroup = nil
+	}()
+
+	fv := *(**funcval)(unsafe.Pointer(&f))
+	newproc(fv)
+
+	sg := gp.syncGroup
+	lock(&sg.mu)
+	sg.active++
+	for {
+		if raceenabled {
+			raceacquireg(gp, gp.syncGroup.raceaddr())
+		}
+		unlock(&sg.mu)
+		systemstack(func() {
+			gp.syncGroup.timers.check(gp.syncGroup.now)
+		})
+		gopark(synctestidle_c, nil, waitReasonSynctestRun, traceBlockSynctest, 0)
+		lock(&sg.mu)
+		if sg.active < 0 {
+			throw("active < 0")
+		}
+		next := sg.timers.wakeTime()
+		if next == 0 {
+			break
+		}
+		if next < sg.now {
+			throw("time went backwards")
+		}
+		sg.now = next
+	}
+
+	total := sg.total
+	unlock(&sg.mu)
+	if total != 1 {
+		panic("deadlock: all goroutines in bubble are blocked")
+	}
+	if gp.timer != nil && gp.timer.isFake {
+		// Verify that we haven't marked this goroutine's sleep timer as fake.
+		// This could happen if something in Run were to call timeSleep.
+		throw("synctest root goroutine has a fake timer")
+	}
+}
+
+func synctestidle_c(gp *g, _ unsafe.Pointer) bool {
+	lock(&gp.syncGroup.mu)
+	canIdle := true
+	if gp.syncGroup.running == 0 && gp.syncGroup.active == 1 {
+		// All goroutines in the group have blocked or exited.
+		canIdle = false
+	} else {
+		gp.syncGroup.active--
+	}
+	unlock(&gp.syncGroup.mu)
+	return canIdle
+}
+
+//go:linkname synctestWait internal/synctest.Wait
+func synctestWait() {
+	gp := getg()
+	if gp.syncGroup == nil {
+		panic("goroutine is not in a bubble")
+	}
+	lock(&gp.syncGroup.mu)
+	// We use a syncGroup.waiting bool to detect simultaneous calls to Wait rather than
+	// checking to see if syncGroup.waiter is non-nil. This avoids a race between unlocking
+	// syncGroup.mu and setting syncGroup.waiter while parking.
+	if gp.syncGroup.waiting {
+		unlock(&gp.syncGroup.mu)
+		panic("wait already in progress")
+	}
+	gp.syncGroup.waiting = true
+	unlock(&gp.syncGroup.mu)
+	gopark(synctestwait_c, nil, waitReasonSynctestWait, traceBlockSynctest, 0)
+
+	lock(&gp.syncGroup.mu)
+	gp.syncGroup.active--
+	if gp.syncGroup.active < 0 {
+		throw("active < 0")
+	}
+	gp.syncGroup.waiter = nil
+	gp.syncGroup.waiting = false
+	unlock(&gp.syncGroup.mu)
+
+	// Establish a happens-before relationship on the activity of the now-blocked
+	// goroutines in the group.
+	if raceenabled {
+		raceacquireg(gp, gp.syncGroup.raceaddr())
+	}
+}
+
+func synctestwait_c(gp *g, _ unsafe.Pointer) bool {
+	lock(&gp.syncGroup.mu)
+	if gp.syncGroup.running == 0 && gp.syncGroup.active == 0 {
+		// This shouldn't be possible, since gopark increments active during unlockf.
+		throw("running == 0 && active == 0")
+	}
+	gp.syncGroup.waiter = gp
+	unlock(&gp.syncGroup.mu)
+	return true
+}
+
+//go:linkname synctest_acquire internal/synctest.acquire
+func synctest_acquire() any {
+	if sg := getg().syncGroup; sg != nil {
+		sg.incActive()
+		return sg
+	}
+	return nil
+}
+
+//go:linkname synctest_release internal/synctest.release
+func synctest_release(sg any) {
+	sg.(*synctestGroup).decActive()
+}
+
+//go:linkname synctest_inBubble internal/synctest.inBubble
+func synctest_inBubble(sg any, f func()) {
+	gp := getg()
+	if gp.syncGroup != nil {
+		panic("goroutine is already bubbled")
+	}
+	gp.syncGroup = sg.(*synctestGroup)
+	defer func() {
+		gp.syncGroup = nil
+	}()
+	f()
+}
diff --git a/src/runtime/synctest_test.go b/src/runtime/synctest_test.go
new file mode 100644
index 00000000..0fdd032f
--- /dev/null
+++ b/src/runtime/synctest_test.go
@@ -0,0 +1,17 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package runtime_test
+
+import (
+	"testing"
+)
+
+func TestSynctest(t *testing.T) {
+	output := runTestProg(t, "testsynctest", "")
+	want := "success\n"
+	if output != want {
+		t.Fatalf("output:\n%s\n\nwanted:\n%s", output, want)
+	}
+}
diff --git a/src/runtime/sys_darwin.go b/src/runtime/sys_darwin.go
index 1e4b2ac7..5c769a71 100644
--- a/src/runtime/sys_darwin.go
+++ b/src/runtime/sys_darwin.go
@@ -571,6 +571,15 @@ func pthread_cond_signal(c *pthreadcond) int32 {
 }
 func pthread_cond_signal_trampoline()
 
+//go:nosplit
+//go:cgo_unsafe_args
+func arc4random_buf(p unsafe.Pointer, n int32) {
+	// arc4random_buf() never fails, per its man page, so it's safe to ignore the return value.
+	libcCall(unsafe.Pointer(abi.FuncPCABI0(arc4random_buf_trampoline)), unsafe.Pointer(&p))
+	KeepAlive(p)
+}
+func arc4random_buf_trampoline()
+
 // Not used on Darwin, but must be defined.
 func exitThread(wait *atomic.Uint32) {
 	throw("exitThread")
@@ -691,6 +700,7 @@ func proc_regionfilename_trampoline()
 //go:cgo_import_dynamic libc_pthread_cond_wait pthread_cond_wait "/usr/lib/libSystem.B.dylib"
 //go:cgo_import_dynamic libc_pthread_cond_timedwait_relative_np pthread_cond_timedwait_relative_np "/usr/lib/libSystem.B.dylib"
 //go:cgo_import_dynamic libc_pthread_cond_signal pthread_cond_signal "/usr/lib/libSystem.B.dylib"
+//go:cgo_import_dynamic libc_arc4random_buf arc4random_buf "/usr/lib/libSystem.B.dylib"
 
 //go:cgo_import_dynamic libc_notify_is_valid_token notify_is_valid_token "/usr/lib/libSystem.B.dylib"
 //go:cgo_import_dynamic libc_xpc_date_create_from_current xpc_date_create_from_current "/usr/lib/libSystem.B.dylib"
diff --git a/src/runtime/sys_darwin_amd64.s b/src/runtime/sys_darwin_amd64.s
index 01992d59..acf24d2f 100644
--- a/src/runtime/sys_darwin_amd64.s
+++ b/src/runtime/sys_darwin_amd64.s
@@ -500,6 +500,12 @@ TEXT runtime·osinit_hack_trampoline(SB),NOSPLIT,$0
 	CALL	libc_xpc_date_create_from_current(SB)
 	RET
 
+TEXT runtime·arc4random_buf_trampoline(SB),NOSPLIT,$0
+	MOVL	8(DI), SI	// arg 2 nbytes
+	MOVQ	0(DI), DI	// arg 1 buf
+	CALL	libc_arc4random_buf(SB)
+	RET
+
 // syscall calls a function in libc on behalf of the syscall package.
 // syscall takes a pointer to a struct like:
 // struct {
diff --git a/src/runtime/sys_darwin_arm64.s b/src/runtime/sys_darwin_arm64.s
index 32d1f95d..788fdf87 100644
--- a/src/runtime/sys_darwin_arm64.s
+++ b/src/runtime/sys_darwin_arm64.s
@@ -475,6 +475,12 @@ TEXT runtime·osinit_hack_trampoline(SB),NOSPLIT,$0
 	BL	libc_xpc_date_create_from_current(SB)
 	RET
 
+TEXT runtime·arc4random_buf_trampoline(SB),NOSPLIT,$0
+	MOVW	8(R0), R1	// arg 2 nbytes
+	MOVD	0(R0), R0	// arg 1 buf
+	BL	libc_arc4random_buf(SB)
+	RET
+
 // syscall calls a function in libc on behalf of the syscall package.
 // syscall takes a pointer to a struct like:
 // struct {
diff --git a/src/runtime/sys_libc.go b/src/runtime/sys_libc.go
index 0c6f13ca..72d89915 100644
--- a/src/runtime/sys_libc.go
+++ b/src/runtime/sys_libc.go
@@ -6,7 +6,10 @@
 
 package runtime
 
-import "unsafe"
+import (
+	"internal/runtime/sys"
+	"unsafe"
+)
 
 // Call fn with arg as its argument. Return what fn returns.
 // fn is the raw pc value of the entry point of the desired function.
@@ -23,10 +26,10 @@ func libcCall(fn, arg unsafe.Pointer) int32 {
 	}
 	if mp != nil && mp.libcallsp == 0 {
 		mp.libcallg.set(gp)
-		mp.libcallpc = getcallerpc()
+		mp.libcallpc = sys.GetCallerPC()
 		// sp must be the last, because once async cpu profiler finds
 		// all three values to be non-zero, it will use them
-		mp.libcallsp = getcallersp()
+		mp.libcallsp = sys.GetCallerSP()
 	} else {
 		// Make sure we don't reset libcallsp. This makes
 		// libcCall reentrant; We remember the g/pc/sp for the
diff --git a/src/runtime/sys_linux_amd64.s b/src/runtime/sys_linux_amd64.s
index b6c64dc0..941f70b0 100644
--- a/src/runtime/sys_linux_amd64.s
+++ b/src/runtime/sys_linux_amd64.s
@@ -704,3 +704,36 @@ TEXT runtime·sbrk0(SB),NOSPLIT,$0-8
 	SYSCALL
 	MOVQ	AX, ret+0(FP)
 	RET
+
+// func vgetrandom1(buf *byte, length uintptr, flags uint32, state uintptr, stateSize uintptr) int
+TEXT runtime·vgetrandom1(SB),NOSPLIT,$16-48
+	MOVQ	SI, R8 // stateSize
+	MOVL	CX, DX // flags
+	MOVQ	DI, CX // state
+	MOVQ	BX, SI // length
+	MOVQ	AX, DI // buf
+
+	MOVQ	SP, R12
+
+	MOVQ	runtime·vdsoGetrandomSym(SB), AX
+	MOVQ	g_m(R14), BX
+
+	MOVQ	m_vdsoPC(BX), R9
+	MOVQ	R9, 0(SP)
+	MOVQ	m_vdsoSP(BX), R9
+	MOVQ	R9, 8(SP)
+	LEAQ	buf+0(FP), R9
+	MOVQ	R9, m_vdsoSP(BX)
+	MOVQ	-8(R9), R9
+	MOVQ	R9, m_vdsoPC(BX)
+
+	ANDQ	$~15, SP
+
+	CALL	AX
+
+	MOVQ	R12, SP
+	MOVQ	8(SP), R9
+	MOVQ	R9, m_vdsoSP(BX)
+	MOVQ	0(SP), R9
+	MOVQ	R9, m_vdsoPC(BX)
+	RET
diff --git a/src/runtime/sys_linux_arm64.s b/src/runtime/sys_linux_arm64.s
index 51c87bea..7a81d547 100644
--- a/src/runtime/sys_linux_arm64.s
+++ b/src/runtime/sys_linux_arm64.s
@@ -785,3 +785,48 @@ TEXT runtime·sbrk0(SB),NOSPLIT,$0-8
 	SVC
 	MOVD	R0, ret+0(FP)
 	RET
+
+// func vgetrandom1(buf *byte, length uintptr, flags uint32, state uintptr, stateSize uintptr) int
+TEXT runtime·vgetrandom1(SB),NOSPLIT,$16-48
+	MOVD	RSP, R20
+
+	MOVD	runtime·vdsoGetrandomSym(SB), R8
+	MOVD	g_m(g), R21
+
+	MOVD	m_vdsoPC(R21), R9
+	MOVD	R9, 8(RSP)
+	MOVD	m_vdsoSP(R21), R9
+	MOVD	R9, 16(RSP)
+	MOVD	LR, m_vdsoPC(R21)
+	MOVD	$buf-8(FP), R9
+	MOVD	R9, m_vdsoSP(R21)
+
+	MOVD	RSP, R9
+	BIC	$15, R9
+	MOVD	R9, RSP
+
+	MOVBU	runtime·iscgo(SB), R9
+	CBNZ	R9, nosaveg
+	MOVD	m_gsignal(R21), R9
+	CBZ	R9, nosaveg
+	CMP	g, R9
+	BEQ	nosaveg
+	MOVD	(g_stack+stack_lo)(R9), R22
+	MOVD	g, (R22)
+
+	BL	(R8)
+
+	MOVD	ZR, (R22)
+	B	restore
+
+nosaveg:
+	BL	(R8)
+
+restore:
+	MOVD	R20, RSP
+	MOVD	16(RSP), R1
+	MOVD	R1, m_vdsoSP(R21)
+	MOVD	8(RSP), R1
+	MOVD	R1, m_vdsoPC(R21)
+	NOP	R0 // Satisfy go vet, since the return value comes from the vDSO function.
+	RET
diff --git a/src/runtime/sys_linux_loong64.s b/src/runtime/sys_linux_loong64.s
index eba8e1f2..57cee99d 100644
--- a/src/runtime/sys_linux_loong64.s
+++ b/src/runtime/sys_linux_loong64.s
@@ -431,12 +431,9 @@ TEXT runtime·sigfwd(SB),NOSPLIT,$0-32
 	JAL	(R20)
 	RET
 
+// Called from c-abi, R4: sig, R5: info, R6: cxt
 // func sigtramp(signo, ureg, ctxt unsafe.Pointer)
 TEXT runtime·sigtramp(SB),NOSPLIT|TOPFRAME,$168
-	MOVW	R4, (1*8)(R3)
-	MOVV	R5, (2*8)(R3)
-	MOVV	R6, (3*8)(R3)
-
 	// Save callee-save registers in the case of signal forwarding.
 	// Please refer to https://golang.org/issue/31827 .
 	SAVE_R22_TO_R31((4*8))
@@ -444,12 +441,13 @@ TEXT runtime·sigtramp(SB),NOSPLIT|TOPFRAME,$168
 
 	// this might be called in external code context,
 	// where g is not set.
-	MOVB	runtime·iscgo(SB), R4
-	BEQ	R4, 2(PC)
+	MOVB	runtime·iscgo(SB), R7
+	BEQ	R7, 2(PC)
 	JAL	runtime·load_g(SB)
 
-	MOVV	$runtime·sigtrampgo(SB), R4
-	JAL	(R4)
+	// R5 and R6 already contain info and ctx, respectively.
+	MOVV	$runtime·sigtrampgo(SB), R7
+	JAL	(R7)
 
 	// Restore callee-save registers.
 	RESTORE_R22_TO_R31((4*8))
@@ -657,3 +655,46 @@ TEXT runtime·socket(SB),$0-20
 	MOVV	R0, 2(R0) // unimplemented, only needed for android; declared in stubs_linux.go
 	MOVW	R0, ret+16(FP) // for vet
 	RET
+
+// func vgetrandom1(buf *byte, length uintptr, flags uint32, state uintptr, stateSize uintptr) int
+TEXT runtime·vgetrandom1(SB),NOSPLIT,$16-48
+	MOVV	R3, R23
+
+	MOVV	runtime·vdsoGetrandomSym(SB), R12
+
+	MOVV	g_m(g), R24
+
+	MOVV	m_vdsoPC(R24), R13
+	MOVV	R13, 8(R3)
+	MOVV	m_vdsoSP(R24), R13
+	MOVV	R13, 16(R3)
+	MOVV	R1, m_vdsoPC(R24)
+	MOVV    $buf-8(FP), R13
+	MOVV	R13, m_vdsoSP(R24)
+
+	AND	$~15, R3
+
+	MOVBU	runtime·iscgo(SB), R13
+	BNE	R13, nosaveg
+	MOVV	m_gsignal(R24), R13
+	BEQ	R13, nosaveg
+	BEQ	g, R13, nosaveg
+	MOVV	(g_stack+stack_lo)(R13), R25
+	MOVV	g, (R25)
+
+	JAL	(R12)
+
+	MOVV	R0, (R25)
+	JMP	restore
+
+nosaveg:
+	JAL	(R12)
+
+restore:
+	MOVV	R23, R3
+	MOVV	16(R3), R25
+	MOVV	R25, m_vdsoSP(R24)
+	MOVV	8(R3), R25
+	MOVV	R25, m_vdsoPC(R24)
+	NOP	R4 // Satisfy go vet, since the return value comes from the vDSO function.
+	RET
diff --git a/src/runtime/sys_linux_ppc64x.s b/src/runtime/sys_linux_ppc64x.s
index ba4988b7..8735b932 100644
--- a/src/runtime/sys_linux_ppc64x.s
+++ b/src/runtime/sys_linux_ppc64x.s
@@ -757,3 +757,53 @@ TEXT runtime·socket(SB),$0-20
 	MOVD	R0, 0(R0) // unimplemented, only needed for android; declared in stubs_linux.go
 	MOVW	R0, ret+16(FP) // for vet
 	RET
+
+// func vgetrandom1(buf *byte, length uintptr, flags uint32, state uintptr, stateSize uintptr) int
+TEXT runtime·vgetrandom1(SB),NOSPLIT,$16-48
+	MOVD	R1, R15
+
+	MOVD	runtime·vdsoGetrandomSym(SB), R12
+	MOVD	R12, CTR
+	MOVD	g_m(g), R21
+
+	MOVD	m_vdsoPC(R21), R22
+	MOVD	R22, 32(R1)
+	MOVD	m_vdsoSP(R21), R22
+	MOVD	R22, 40(R1)
+	MOVD	LR, m_vdsoPC(R21)
+	MOVD	$buf-FIXED_FRAME(FP), R22
+	MOVD	R22, m_vdsoSP(R21)
+
+	RLDICR  $0, R1, $59, R1
+
+	MOVBZ	runtime·iscgo(SB), R22
+	CMP	R22, $0
+	BNE	nosaveg
+	MOVD	m_gsignal(R21), R22
+	CMP	R22, $0
+	BEQ	nosaveg
+	CMP	R22, g
+	BEQ	nosaveg
+	MOVD	(g_stack+stack_lo)(R22), R22
+	MOVD	g, (R22)
+
+	BL	(CTR)
+
+	MOVD	$0, (R22)
+	JMP	restore
+
+nosaveg:
+	BL	(CTR)
+
+restore:
+	MOVD	$0, R0
+	MOVD	R15, R1
+	MOVD	40(R1), R22
+	MOVD	R22, m_vdsoSP(R21)
+	MOVD	32(R1), R22
+	MOVD	R22, m_vdsoPC(R21)
+
+	BVC	out
+	NEG	R3, R3
+out:
+	RET
diff --git a/src/runtime/sys_linux_riscv64.s b/src/runtime/sys_linux_riscv64.s
index ffec2b5b..0d4fb3b5 100644
--- a/src/runtime/sys_linux_riscv64.s
+++ b/src/runtime/sys_linux_riscv64.s
@@ -51,8 +51,7 @@
 #define SYS_write		64
 
 // func exit(code int32)
-TEXT runtime·exit(SB),NOSPLIT|NOFRAME,$0-4
-	MOVW	code+0(FP), A0
+TEXT runtime·exit(SB),NOSPLIT,$0
 	MOV	$SYS_exit_group, A7
 	ECALL
 	RET
@@ -95,23 +94,15 @@ TEXT runtime·closefd(SB),NOSPLIT|NOFRAME,$0-12
 	RET
 
 // func write1(fd uintptr, p unsafe.Pointer, n int32) int32
-TEXT runtime·write1(SB),NOSPLIT|NOFRAME,$0-28
-	MOV	fd+0(FP), A0
-	MOV	p+8(FP), A1
-	MOVW	n+16(FP), A2
+TEXT runtime·write1(SB),NOSPLIT,$0
 	MOV	$SYS_write, A7
 	ECALL
-	MOVW	A0, ret+24(FP)
 	RET
 
 // func read(fd int32, p unsafe.Pointer, n int32) int32
-TEXT runtime·read(SB),NOSPLIT|NOFRAME,$0-28
-	MOVW	fd+0(FP), A0
-	MOV	p+8(FP), A1
-	MOVW	n+16(FP), A2
+TEXT runtime·read(SB),NOSPLIT,$0
 	MOV	$SYS_read, A7
 	ECALL
-	MOVW	A0, ret+24(FP)
 	RET
 
 // func pipe2(flags int32) (r, w int32, errno int32)
@@ -140,10 +131,9 @@ TEXT runtime·usleep(SB),NOSPLIT,$24-4
 	RET
 
 // func gettid() uint32
-TEXT runtime·gettid(SB),NOSPLIT,$0-4
+TEXT runtime·gettid(SB),NOSPLIT,$0
 	MOV	$SYS_gettid, A7
 	ECALL
-	MOVW	A0, ret+0(FP)
 	RET
 
 // func raise(sig uint32)
@@ -167,67 +157,45 @@ TEXT runtime·raiseproc(SB),NOSPLIT|NOFRAME,$0
 	RET
 
 // func getpid() int
-TEXT ·getpid(SB),NOSPLIT|NOFRAME,$0-8
+TEXT ·getpid(SB),NOSPLIT,$0
 	MOV	$SYS_getpid, A7
 	ECALL
-	MOV	A0, ret+0(FP)
 	RET
 
 // func tgkill(tgid, tid, sig int)
-TEXT ·tgkill(SB),NOSPLIT|NOFRAME,$0-24
-	MOV	tgid+0(FP), A0
-	MOV	tid+8(FP), A1
-	MOV	sig+16(FP), A2
+TEXT ·tgkill(SB),NOSPLIT,$0
 	MOV	$SYS_tgkill, A7
 	ECALL
 	RET
 
 // func setitimer(mode int32, new, old *itimerval)
-TEXT runtime·setitimer(SB),NOSPLIT|NOFRAME,$0-24
-	MOVW	mode+0(FP), A0
-	MOV	new+8(FP), A1
-	MOV	old+16(FP), A2
+TEXT runtime·setitimer(SB),NOSPLIT,$0
 	MOV	$SYS_setitimer, A7
 	ECALL
 	RET
 
 // func timer_create(clockid int32, sevp *sigevent, timerid *int32) int32
-TEXT runtime·timer_create(SB),NOSPLIT,$0-28
-	MOVW	clockid+0(FP), A0
-	MOV	sevp+8(FP), A1
-	MOV	timerid+16(FP), A2
+TEXT runtime·timer_create(SB),NOSPLIT,$0
 	MOV	$SYS_timer_create, A7
 	ECALL
-	MOVW	A0, ret+24(FP)
 	RET
 
 // func timer_settime(timerid int32, flags int32, new, old *itimerspec) int32
-TEXT runtime·timer_settime(SB),NOSPLIT,$0-28
-	MOVW	timerid+0(FP), A0
-	MOVW	flags+4(FP), A1
-	MOV	new+8(FP), A2
-	MOV	old+16(FP), A3
+TEXT runtime·timer_settime(SB),NOSPLIT,$0
 	MOV	$SYS_timer_settime, A7
 	ECALL
-	MOVW	A0, ret+24(FP)
 	RET
 
 // func timer_delete(timerid int32) int32
-TEXT runtime·timer_delete(SB),NOSPLIT,$0-12
-	MOVW	timerid+0(FP), A0
+TEXT runtime·timer_delete(SB),NOSPLIT,$0
 	MOV	$SYS_timer_delete, A7
 	ECALL
-	MOVW	A0, ret+8(FP)
 	RET
 
 // func mincore(addr unsafe.Pointer, n uintptr, dst *byte) int32
-TEXT runtime·mincore(SB),NOSPLIT|NOFRAME,$0-28
-	MOV	addr+0(FP), A0
-	MOV	n+8(FP), A1
-	MOV	dst+16(FP), A2
+TEXT runtime·mincore(SB),NOSPLIT,$0
 	MOV	$SYS_mincore, A7
 	ECALL
-	MOVW	A0, ret+24(FP)
 	RET
 
 // func walltime() (sec int64, nsec int32)
@@ -393,14 +361,9 @@ TEXT runtime·rtsigprocmask(SB),NOSPLIT|NOFRAME,$0-28
 	RET
 
 // func rt_sigaction(sig uintptr, new, old *sigactiont, size uintptr) int32
-TEXT runtime·rt_sigaction(SB),NOSPLIT|NOFRAME,$0-36
-	MOV	sig+0(FP), A0
-	MOV	new+8(FP), A1
-	MOV	old+16(FP), A2
-	MOV	size+24(FP), A3
+TEXT runtime·rt_sigaction(SB),NOSPLIT,$0
 	MOV	$SYS_rt_sigaction, A7
 	ECALL
-	MOVW	A0, ret+32(FP)
 	RET
 
 // func sigfwd(fn uintptr, sig uint32, info *siginfo, ctx unsafe.Pointer)
@@ -466,26 +429,15 @@ TEXT runtime·munmap(SB),NOSPLIT|NOFRAME,$0
 	RET
 
 // func madvise(addr unsafe.Pointer, n uintptr, flags int32)
-TEXT runtime·madvise(SB),NOSPLIT|NOFRAME,$0
-	MOV	addr+0(FP), A0
-	MOV	n+8(FP), A1
-	MOVW	flags+16(FP), A2
+TEXT runtime·madvise(SB),NOSPLIT,$0
 	MOV	$SYS_madvise, A7
 	ECALL
-	MOVW	A0, ret+24(FP)
 	RET
 
 // func futex(addr unsafe.Pointer, op int32, val uint32, ts, addr2 unsafe.Pointer, val3 uint32) int32
-TEXT runtime·futex(SB),NOSPLIT|NOFRAME,$0
-	MOV	addr+0(FP), A0
-	MOVW	op+8(FP), A1
-	MOVW	val+12(FP), A2
-	MOV	ts+16(FP), A3
-	MOV	addr2+24(FP), A4
-	MOVW	val3+32(FP), A5
+TEXT runtime·futex(SB),NOSPLIT,$0
 	MOV	$SYS_futex, A7
 	ECALL
-	MOVW	A0, ret+40(FP)
 	RET
 
 // func clone(flags int32, stk, mp, gp, fn unsafe.Pointer) int32
@@ -559,26 +511,21 @@ TEXT runtime·sigaltstack(SB),NOSPLIT|NOFRAME,$0
 	RET
 
 // func osyield()
-TEXT runtime·osyield(SB),NOSPLIT|NOFRAME,$0
+TEXT runtime·osyield(SB),NOSPLIT,$0
 	MOV	$SYS_sched_yield, A7
 	ECALL
 	RET
 
 // func sched_getaffinity(pid, len uintptr, buf *uintptr) int32
-TEXT runtime·sched_getaffinity(SB),NOSPLIT|NOFRAME,$0
-	MOV	pid+0(FP), A0
-	MOV	len+8(FP), A1
-	MOV	buf+16(FP), A2
+TEXT runtime·sched_getaffinity(SB),NOSPLIT,$0
 	MOV	$SYS_sched_getaffinity, A7
 	ECALL
-	MOV	A0, ret+24(FP)
 	RET
 
 // func sbrk0() uintptr
-TEXT runtime·sbrk0(SB),NOSPLIT,$0-8
+TEXT runtime·sbrk0(SB),NOSPLIT,$0
 	// Implemented as brk(NULL).
-	MOV	$0, A0
+	MOV	ZERO, A0
 	MOV	$SYS_brk, A7
 	ECALL
-	MOVW	A0, ret+0(FP)
 	RET
diff --git a/src/runtime/sys_linux_s390x.s b/src/runtime/sys_linux_s390x.s
index adf5612c..7da4a527 100644
--- a/src/runtime/sys_linux_s390x.s
+++ b/src/runtime/sys_linux_s390x.s
@@ -604,3 +604,53 @@ TEXT runtime·socket(SB),$0-20
 	MOVD	$0, 2(R0) // unimplemented, only needed for android; declared in stubs_linux.go
 	MOVW	R0, ret+16(FP)
 	RET
+
+// func vgetrandom1(buf *byte, length uintptr, flags uint32, state uintptr, stateSize uintptr) int
+TEXT runtime·vgetrandom1(SB),NOSPLIT,$16-48
+	MOVD	buf+0(FP), R2
+	MOVD	length+8(FP), R3
+	MOVW	flags+16(FP), R4
+	MOVD	state+24(FP), R5
+	MOVD	stateSize+32(FP), R6
+
+	MOVD	R15, R7
+
+	MOVD	runtime·vdsoGetrandomSym(SB), R1
+	MOVD	g_m(g), R9
+
+	MOVD	m_vdsoPC(R9), R12
+	MOVD	R12, 8(R15)
+	MOVD	m_vdsoSP(R9), R12
+	MOVD	R12, 16(R15)
+	MOVD	R14, m_vdsoPC(R9)
+	MOVD	$buf+0(FP), R12
+	MOVD	R12, m_vdsoSP(R9)
+
+	SUB	$160, R15
+	MOVD	$~7, R12
+	AND	R12, R15
+
+	MOVB	runtime·iscgo(SB), R12
+	CMPBNE	R12, $0, nosaveg
+	MOVD	m_gsignal(R9), R12
+	CMPBEQ	R12, $0, nosaveg
+	CMPBEQ	g, R12, nosaveg
+	MOVD	(g_stack+stack_lo)(R12), R12
+	MOVD	g, (R12)
+
+	BL	R1
+
+	MOVD	$0, (R12)
+	JMP	restore
+
+nosaveg:
+	BL	R1
+
+restore:
+	MOVD	R7, R15
+	MOVD	16(R15), R12
+	MOVD	R12, m_vdsoSP(R9)
+	MOVD	8(R15), R12
+	MOVD	R12, m_vdsoPC(R9)
+	MOVD	R2, ret+40(FP)
+	RET
diff --git a/src/runtime/sys_wasm.go b/src/runtime/sys_wasm.go
index 27f9432b..6b40a8d3 100644
--- a/src/runtime/sys_wasm.go
+++ b/src/runtime/sys_wasm.go
@@ -6,7 +6,7 @@ package runtime
 
 import (
 	"internal/goarch"
-	"runtime/internal/sys"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
@@ -34,3 +34,17 @@ func gostartcall(buf *gobuf, fn, ctxt unsafe.Pointer) {
 	buf.pc = uintptr(fn)
 	buf.ctxt = ctxt
 }
+
+func notInitialized() // defined in assembly, call notInitialized1
+
+// Called if a wasmexport function is called before runtime initialization
+//
+//go:nosplit
+func notInitialized1() {
+	writeErrStr("runtime: wasmexport function called before runtime initialization\n")
+	if isarchive || islibrary {
+		writeErrStr("\tcall _initialize first\n")
+	} else {
+		writeErrStr("\tcall _start first\n")
+	}
+}
diff --git a/src/runtime/sys_wasm.s b/src/runtime/sys_wasm.s
index 1e73adad..b7965ec3 100644
--- a/src/runtime/sys_wasm.s
+++ b/src/runtime/sys_wasm.s
@@ -86,6 +86,12 @@ TEXT runtime·exitThread(SB), NOSPLIT, $0-0
 TEXT runtime·osyield(SB), NOSPLIT, $0-0
 	UNDEF
 
+TEXT runtime·currentMemory(SB), NOSPLIT, $0
+	Get SP
+	CurrentMemory
+	I32Store ret+0(FP)
+	RET
+
 TEXT runtime·growMemory(SB), NOSPLIT, $0
 	Get SP
 	I32Load pages+0(FP)
diff --git a/src/runtime/sys_windows_arm.s b/src/runtime/sys_windows_arm.s
index d194899d..99f33cf0 100644
--- a/src/runtime/sys_windows_arm.s
+++ b/src/runtime/sys_windows_arm.s
@@ -205,6 +205,7 @@ TEXT runtime·read_tls_fallback(SB),NOSPLIT,$0
 	RET
 
 TEXT runtime·nanotime1(SB),NOSPLIT,$0-8
+	MOVW	$_INTERRUPT_TIME, R3
 loop:
 	MOVW	time_hi1(R3), R1
 	DMB	MB_ISH
diff --git a/src/runtime/syscall_windows_test.go b/src/runtime/syscall_windows_test.go
index 2db5b61a..53f71108 100644
--- a/src/runtime/syscall_windows_test.go
+++ b/src/runtime/syscall_windows_test.go
@@ -673,7 +673,7 @@ func TestWindowsStackMemory(t *testing.T) {
 	if err != nil {
 		t.Fatalf("Failed to read stack usage: %v", err)
 	}
-	if expected, got := 100<<10, stackUsage; got > expected {
+	if expected, got := 128<<10, stackUsage; got > expected {
 		t.Fatalf("expected < %d bytes of memory per thread, got %d", expected, got)
 	}
 }
@@ -1111,12 +1111,6 @@ func TestDLLPreloadMitigation(t *testing.T) {
 
 	tmpdir := t.TempDir()
 
-	dir0, err := os.Getwd()
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.Chdir(dir0)
-
 	const src = `
 #include 
 #include 
@@ -1127,7 +1121,7 @@ uintptr_t cfunc(void) {
 }
 `
 	srcname := "nojack.c"
-	err = os.WriteFile(filepath.Join(tmpdir, srcname), []byte(src), 0)
+	err := os.WriteFile(filepath.Join(tmpdir, srcname), []byte(src), 0)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -1148,7 +1142,7 @@ uintptr_t cfunc(void) {
 	// ("nojack.dll") Think of this as the user double-clicking an
 	// installer from their Downloads directory where a browser
 	// silently downloaded some malicious DLLs.
-	os.Chdir(tmpdir)
+	t.Chdir(tmpdir)
 
 	// First before we can load a DLL from the current directory,
 	// loading it only as "nojack.dll", without an absolute path.
diff --git a/src/runtime/testdata/testprogcgo/callback.go b/src/runtime/testdata/testprogcgo/callback.go
index 319572fe..39993f13 100644
--- a/src/runtime/testdata/testprogcgo/callback.go
+++ b/src/runtime/testdata/testprogcgo/callback.go
@@ -38,10 +38,21 @@ import (
 
 func init() {
 	register("CgoCallbackGC", CgoCallbackGC)
+	register("CgoToGoCallGoexit", CgoToGoCallGoexit)
 }
 
+func CgoToGoCallGoexit() {
+	goexit = true
+	C.foo()
+}
+
+var goexit = false
+
 //export go_callback
 func go_callback() {
+	if goexit {
+		runtime.Goexit()
+	}
 	if e := extraMInUse.Load(); e == 0 {
 		fmt.Printf("in callback extraMInUse got %d want >0\n", e)
 		os.Exit(1)
diff --git a/src/runtime/testdata/testprogcgo/cgonocallback.go b/src/runtime/testdata/testprogcgo/cgonocallback.go
index c13bf271..8cbbfd19 100644
--- a/src/runtime/testdata/testprogcgo/cgonocallback.go
+++ b/src/runtime/testdata/testprogcgo/cgonocallback.go
@@ -8,7 +8,8 @@ package main
 // But it do callback to go in this test, Go should crash here.
 
 /*
-// TODO(#56378): #cgo nocallback runCShouldNotCallback
+#cgo nocallback runCShouldNotCallback
+
 extern void runCShouldNotCallback();
 */
 import "C"
diff --git a/src/runtime/testdata/testprogcgo/cgonoescape.go b/src/runtime/testdata/testprogcgo/cgonoescape.go
index f5eebac6..2b7c7a9c 100644
--- a/src/runtime/testdata/testprogcgo/cgonoescape.go
+++ b/src/runtime/testdata/testprogcgo/cgonoescape.go
@@ -13,7 +13,8 @@ package main
 // 2. less than 100 new allocated heap objects after invoking withoutNoEscape 100 times.
 
 /*
-// TODO(#56378): #cgo noescape runCWithNoEscape
+#cgo noescape runCWithNoEscape
+#cgo nocallback runCWithNoEscape
 
 void runCWithNoEscape(void *p) {
 }
diff --git a/src/runtime/testdata/testprogcgo/issue63739.go b/src/runtime/testdata/testprogcgo/issue63739.go
new file mode 100644
index 00000000..dbe37b6d
--- /dev/null
+++ b/src/runtime/testdata/testprogcgo/issue63739.go
@@ -0,0 +1,59 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+// This is for issue #63739.
+// Ensure that parameters are kept alive until the end of the C call. If not,
+// then a stack copy at just the right time while calling into C might think
+// that any stack pointers are not alive and fail to update them, causing the C
+// function to see the old, no longer correct, pointer values.
+
+/*
+int add_from_multiple_pointers(int *a, int *b, int *c) {
+	*a = *a + 1;
+	*b = *b + 1;
+	*c = *c + 1;
+	return *a + *b + *c;
+}
+#cgo noescape add_from_multiple_pointers
+#cgo nocallback add_from_multiple_pointers
+*/
+import "C"
+
+import (
+	"fmt"
+)
+
+const (
+	maxStack = 1024
+)
+
+func init() {
+	register("CgoEscapeWithMultiplePointers", CgoEscapeWithMultiplePointers)
+}
+
+func CgoEscapeWithMultiplePointers() {
+	stackGrow(maxStack)
+	fmt.Println("OK")
+}
+
+//go:noinline
+func testCWithMultiplePointers() {
+	var a C.int = 1
+	var b C.int = 2
+	var c C.int = 3
+	v := C.add_from_multiple_pointers(&a, &b, &c)
+	if v != 9 || a != 2 || b != 3 || c != 4 {
+		fmt.Printf("%d + %d + %d != %d\n", a, b, c, v)
+	}
+}
+
+func stackGrow(n int) {
+	if n == 0 {
+		return
+	}
+	testCWithMultiplePointers()
+	stackGrow(n - 1)
+}
diff --git a/src/runtime/testdata/testprogcgo/threadprof.go b/src/runtime/testdata/testprogcgo/threadprof.go
index 00b511d2..2d8c0f6d 100644
--- a/src/runtime/testdata/testprogcgo/threadprof.go
+++ b/src/runtime/testdata/testprogcgo/threadprof.go
@@ -36,10 +36,10 @@ __attribute__((constructor)) void issue9456() {
 	}
 }
 
-void **nullptr;
+void **nullpointer;
 
 void *crash(void *p) {
-	*nullptr = p;
+	*nullpointer = p;
 	return 0;
 }
 
diff --git a/src/runtime/testdata/testsynctest/main.go b/src/runtime/testdata/testsynctest/main.go
new file mode 100644
index 00000000..d2cbc992
--- /dev/null
+++ b/src/runtime/testdata/testsynctest/main.go
@@ -0,0 +1,67 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+import (
+	"internal/synctest"
+	"runtime"
+	"runtime/metrics"
+)
+
+// This program ensures system goroutines (GC workers, finalizer goroutine)
+// started from within a synctest bubble do not participate in that bubble.
+//
+// To ensure none of these goroutines start before synctest.Run,
+// it must have no dependencies on packages which may start system goroutines.
+// This includes the os package, which creates finalizers at init time.
+
+func numGCCycles() uint64 {
+	samples := []metrics.Sample{{Name: "/gc/cycles/total:gc-cycles"}}
+	metrics.Read(samples)
+	if samples[0].Value.Kind() == metrics.KindBad {
+		panic("metric not supported")
+	}
+	return samples[0].Value.Uint64()
+}
+
+func main() {
+	synctest.Run(func() {
+		// Start the finalizer goroutine.
+		p := new(int)
+		runtime.SetFinalizer(p, func(*int) {})
+
+		startingCycles := numGCCycles()
+		ch1 := make(chan *int)
+		ch2 := make(chan *int)
+		defer close(ch1)
+		go func() {
+			for i := range ch1 {
+				v := *i + 1
+				ch2 <- &v
+			}
+		}()
+		for {
+			// Make a lot of short-lived allocations to get the GC working.
+			for i := 0; i < 1000; i++ {
+				v := new(int)
+				*v = i
+				// Set finalizers on these values, just for added stress.
+				runtime.SetFinalizer(v, func(*int) {})
+				ch1 <- v
+				<-ch2
+			}
+
+			// If we've improperly put a GC goroutine into the synctest group,
+			// this Wait is going to hang.
+			synctest.Wait()
+
+			// End the test after a couple of GC cycles have passed.
+			if numGCCycles()-startingCycles > 1 {
+				break
+			}
+		}
+	})
+	println("success")
+}
diff --git a/src/runtime/time.go b/src/runtime/time.go
index 7b344a34..c22d39c0 100644
--- a/src/runtime/time.go
+++ b/src/runtime/time.go
@@ -9,10 +9,29 @@ package runtime
 import (
 	"internal/abi"
 	"internal/runtime/atomic"
-	"runtime/internal/sys"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
+//go:linkname time_runtimeNow time.runtimeNow
+func time_runtimeNow() (sec int64, nsec int32, mono int64) {
+	if sg := getg().syncGroup; sg != nil {
+		sec = sg.now / (1000 * 1000 * 1000)
+		nsec = int32(sg.now % (1000 * 1000 * 1000))
+		return sec, nsec, sg.now
+	}
+	return time_now()
+}
+
+//go:linkname time_runtimeNano time.runtimeNano
+func time_runtimeNano() int64 {
+	gp := getg()
+	if gp.syncGroup != nil {
+		return gp.syncGroup.now
+	}
+	return nanotime()
+}
+
 // A timer is a potentially repeating trigger for calling t.f(t.arg, t.seq).
 // Timers are allocated by client code, often as part of other data structures.
 // Each P has a heap of pointers to timers that it manages.
@@ -29,6 +48,7 @@ type timer struct {
 	astate atomic.Uint8 // atomic copy of state bits at last unlock
 	state  uint8        // state bits
 	isChan bool         // timer has a channel; immutable; can be read without lock
+	isFake bool         // timer is using fake time; immutable; can be read without lock
 
 	blocked uint32 // number of goroutines blocked on timer's channel
 
@@ -39,7 +59,7 @@ type timer struct {
 	// The arg and seq are client-specified opaque arguments passed back to f.
 	// When used from netpoll, arg and seq have meanings defined by netpoll
 	// and are completely opaque to this code; in that context, seq is a sequence
-	// number to recognize and squech stale function invocations.
+	// number to recognize and squelch stale function invocations.
 	// When used from package time, arg is a channel (for After, NewTicker)
 	// or the function to call (for AfterFunc) and seq is unused (0).
 	//
@@ -125,6 +145,8 @@ type timers struct {
 	// heap[i].when over timers with the timerModified bit set.
 	// If minWhenModified = 0, it means there are no timerModified timers in the heap.
 	minWhenModified atomic.Int64
+
+	syncGroup *synctestGroup
 }
 
 type timerWhen struct {
@@ -290,14 +312,31 @@ func timeSleep(ns int64) {
 	if t == nil {
 		t = new(timer)
 		t.init(goroutineReady, gp)
+		if gp.syncGroup != nil {
+			t.isFake = true
+		}
 		gp.timer = t
 	}
-	when := nanotime() + ns
+	var now int64
+	if sg := gp.syncGroup; sg != nil {
+		now = sg.now
+	} else {
+		now = nanotime()
+	}
+	when := now + ns
 	if when < 0 { // check for overflow.
 		when = maxWhen
 	}
 	gp.sleepWhen = when
-	gopark(resetForSleep, nil, waitReasonSleep, traceBlockSleep, 1)
+	if t.isFake {
+		// Call timer.reset in this goroutine, since it's the one in a syncGroup.
+		// We don't need to worry about the timer function running before the goroutine
+		// is parked, because time won't advance until we park.
+		resetForSleep(gp, nil)
+		gopark(nil, nil, waitReasonSleep, traceBlockSleep, 1)
+	} else {
+		gopark(resetForSleep, nil, waitReasonSleep, traceBlockSleep, 1)
+	}
 }
 
 // resetForSleep is called after the goroutine is parked for timeSleep.
@@ -337,6 +376,9 @@ func newTimer(when, period int64, f func(arg any, seq uintptr, delay int64), arg
 			throw("invalid timer channel: no capacity")
 		}
 	}
+	if gr := getg().syncGroup; gr != nil {
+		t.isFake = true
+	}
 	t.modify(when, period, f, arg, 0)
 	t.init = true
 	return t
@@ -347,6 +389,9 @@ func newTimer(when, period int64, f func(arg any, seq uintptr, delay int64), arg
 //
 //go:linkname stopTimer time.stopTimer
 func stopTimer(t *timeTimer) bool {
+	if t.isFake && getg().syncGroup == nil {
+		panic("stop of synctest timer from outside bubble")
+	}
 	return t.stop()
 }
 
@@ -359,6 +404,9 @@ func resetTimer(t *timeTimer, when, period int64) bool {
 	if raceenabled {
 		racerelease(unsafe.Pointer(&t.timer))
 	}
+	if t.isFake && getg().syncGroup == nil {
+		panic("reset of synctest timer from outside bubble")
+	}
 	return t.reset(when, period)
 }
 
@@ -582,7 +630,7 @@ func (t *timer) modify(when, period int64, f func(arg any, seq uintptr, delay in
 // t must be locked.
 func (t *timer) needsAdd() bool {
 	assertLockHeld(&t.mu)
-	need := t.state&timerHeaped == 0 && t.when > 0 && (!t.isChan || t.blocked > 0)
+	need := t.state&timerHeaped == 0 && t.when > 0 && (!t.isChan || t.isFake || t.blocked > 0)
 	if need {
 		t.trace("needsAdd+")
 	} else {
@@ -620,7 +668,16 @@ func (t *timer) maybeAdd() {
 	// Calling acquirem instead of using getg().m makes sure that
 	// we end up locking and inserting into the current P's timers.
 	mp := acquirem()
-	ts := &mp.p.ptr().timers
+	var ts *timers
+	if t.isFake {
+		sg := getg().syncGroup
+		if sg == nil {
+			throw("invalid timer: fake time but no syncgroup")
+		}
+		ts = &sg.timers
+	} else {
+		ts = &mp.p.ptr().timers
+	}
 	ts.lock()
 	ts.cleanHead()
 	t.lock()
@@ -1071,6 +1128,16 @@ func (t *timer) unlockAndRun(now int64) {
 		ts.unlock()
 	}
 
+	if ts != nil && ts.syncGroup != nil {
+		// Temporarily use the timer's synctest group for the G running this timer.
+		gp := getg()
+		if gp.syncGroup != nil {
+			throw("unexpected syncgroup set")
+		}
+		gp.syncGroup = ts.syncGroup
+		ts.syncGroup.changegstatus(gp, _Gdead, _Grunning)
+	}
+
 	if !async && t.isChan {
 		// For a timer channel, we want to make sure that no stale sends
 		// happen after a t.stop or t.modify, but we cannot hold t.mu
@@ -1112,6 +1179,12 @@ func (t *timer) unlockAndRun(now int64) {
 		unlock(&t.sendLock)
 	}
 
+	if ts != nil && ts.syncGroup != nil {
+		gp := getg()
+		ts.syncGroup.changegstatus(gp, _Grunning, _Gdead)
+		gp.syncGroup = nil
+	}
+
 	if ts != nil {
 		ts.lock()
 	}
@@ -1297,6 +1370,24 @@ func badTimer() {
 // to send a value to its associated channel. If so, it does.
 // The timer must not be locked.
 func (t *timer) maybeRunChan() {
+	if t.isFake {
+		t.lock()
+		var timerGroup *synctestGroup
+		if t.ts != nil {
+			timerGroup = t.ts.syncGroup
+		}
+		t.unlock()
+		sg := getg().syncGroup
+		if sg == nil {
+			panic(plainError("synctest timer accessed from outside bubble"))
+		}
+		if timerGroup != nil && sg != timerGroup {
+			panic(plainError("timer moved between synctest bubbles"))
+		}
+		// No need to do anything here.
+		// synctest.Run will run the timer when it advances its fake clock.
+		return
+	}
 	if t.astate.Load()&timerHeaped != 0 {
 		// If the timer is in the heap, the ordinary timer code
 		// is in charge of sending when appropriate.
@@ -1323,6 +1414,9 @@ func (t *timer) maybeRunChan() {
 // adding it if needed.
 func blockTimerChan(c *hchan) {
 	t := c.timer
+	if t.isFake {
+		return
+	}
 	t.lock()
 	t.trace("blockTimerChan")
 	if !t.isChan {
@@ -1360,6 +1454,9 @@ func blockTimerChan(c *hchan) {
 // blocked on it anymore.
 func unblockTimerChan(c *hchan) {
 	t := c.timer
+	if t.isFake {
+		return
+	}
 	t.lock()
 	t.trace("unblockTimerChan")
 	if !t.isChan || t.blocked == 0 {
diff --git a/src/runtime/time_linux_amd64.s b/src/runtime/time_linux_amd64.s
index 1416d232..fa9561b2 100644
--- a/src/runtime/time_linux_amd64.s
+++ b/src/runtime/time_linux_amd64.s
@@ -10,7 +10,7 @@
 
 #define SYS_clock_gettime	228
 
-// func time.now() (sec int64, nsec int32, mono int64)
+// func now() (sec int64, nsec int32, mono int64)
 TEXT time·now(SB),NOSPLIT,$16-24
 	MOVQ	SP, R12 // Save old SP; R12 unchanged by C code.
 
diff --git a/src/runtime/trace.go b/src/runtime/trace.go
index adf7b095..bc2978bb 100644
--- a/src/runtime/trace.go
+++ b/src/runtime/trace.go
@@ -524,10 +524,11 @@ func traceAdvance(stopTrace bool) {
 				// trace.lock needed for traceBufFlush, but also to synchronize
 				// with traceThreadDestroy, which flushes both buffers unconditionally.
 				lock(&trace.lock)
-				bufp := &mp.trace.buf[gen%2]
-				if *bufp != nil {
-					traceBufFlush(*bufp, gen)
-					*bufp = nil
+				for exp, buf := range mp.trace.buf[gen%2] {
+					if buf != nil {
+						traceBufFlush(buf, gen)
+						mp.trace.buf[gen%2][exp] = nil
+					}
 				}
 				unlock(&trace.lock)
 
diff --git a/src/runtime/trace_cgo_test.go b/src/runtime/trace_cgo_test.go
index f0db3b7f..871698f8 100644
--- a/src/runtime/trace_cgo_test.go
+++ b/src/runtime/trace_cgo_test.go
@@ -94,10 +94,9 @@ func mustFindLogV2(t *testing.T, trc io.Reader, category string) trace.Event {
 // dumpStack returns e.Stack() as a string.
 func dumpStackV2(e *trace.Event) string {
 	var buf bytes.Buffer
-	e.Stack().Frames(func(f trace.StackFrame) bool {
+	for f := range e.Stack().Frames() {
 		file := strings.TrimPrefix(f.File, runtime.GOROOT())
 		fmt.Fprintf(&buf, "%s\n\t%s:%d\n", f.Func, file, f.Line)
-		return true
-	})
+	}
 	return buf.String()
 }
diff --git a/src/runtime/traceallocfree.go b/src/runtime/traceallocfree.go
index e6a2a79c..84188a55 100644
--- a/src/runtime/traceallocfree.go
+++ b/src/runtime/traceallocfree.go
@@ -8,7 +8,7 @@ package runtime
 
 import (
 	"internal/abi"
-	"runtime/internal/sys"
+	"internal/runtime/sys"
 )
 
 // Batch type values for the alloc/free experiment.
@@ -89,17 +89,17 @@ func traceSpanTypeAndClass(s *mspan) traceArg {
 
 // SpanExists records an event indicating that the span exists.
 func (tl traceLocker) SpanExists(s *mspan) {
-	tl.eventWriter(traceGoRunning, traceProcRunning).commit(traceEvSpan, traceSpanID(s), traceArg(s.npages), traceSpanTypeAndClass(s))
+	tl.eventWriter(traceGoRunning, traceProcRunning).event(traceEvSpan, traceSpanID(s), traceArg(s.npages), traceSpanTypeAndClass(s))
 }
 
 // SpanAlloc records an event indicating that the span has just been allocated.
 func (tl traceLocker) SpanAlloc(s *mspan) {
-	tl.eventWriter(traceGoRunning, traceProcRunning).commit(traceEvSpanAlloc, traceSpanID(s), traceArg(s.npages), traceSpanTypeAndClass(s))
+	tl.eventWriter(traceGoRunning, traceProcRunning).event(traceEvSpanAlloc, traceSpanID(s), traceArg(s.npages), traceSpanTypeAndClass(s))
 }
 
 // SpanFree records an event indicating that the span is about to be freed.
 func (tl traceLocker) SpanFree(s *mspan) {
-	tl.eventWriter(traceGoRunning, traceProcRunning).commit(traceEvSpanFree, traceSpanID(s))
+	tl.eventWriter(traceGoRunning, traceProcRunning).event(traceEvSpanFree, traceSpanID(s))
 }
 
 // traceSpanID creates a trace ID for the span s for the trace.
@@ -111,19 +111,19 @@ func traceSpanID(s *mspan) traceArg {
 // The type is optional, and the size of the slot occupied the object is inferred from the
 // span containing it.
 func (tl traceLocker) HeapObjectExists(addr uintptr, typ *abi.Type) {
-	tl.eventWriter(traceGoRunning, traceProcRunning).commit(traceEvHeapObject, traceHeapObjectID(addr), tl.rtype(typ))
+	tl.eventWriter(traceGoRunning, traceProcRunning).event(traceEvHeapObject, traceHeapObjectID(addr), tl.rtype(typ))
 }
 
 // HeapObjectAlloc records that an object was newly allocated at addr with the provided type.
 // The type is optional, and the size of the slot occupied the object is inferred from the
 // span containing it.
 func (tl traceLocker) HeapObjectAlloc(addr uintptr, typ *abi.Type) {
-	tl.eventWriter(traceGoRunning, traceProcRunning).commit(traceEvHeapObjectAlloc, traceHeapObjectID(addr), tl.rtype(typ))
+	tl.eventWriter(traceGoRunning, traceProcRunning).event(traceEvHeapObjectAlloc, traceHeapObjectID(addr), tl.rtype(typ))
 }
 
 // HeapObjectFree records that an object at addr is about to be freed.
 func (tl traceLocker) HeapObjectFree(addr uintptr) {
-	tl.eventWriter(traceGoRunning, traceProcRunning).commit(traceEvHeapObjectFree, traceHeapObjectID(addr))
+	tl.eventWriter(traceGoRunning, traceProcRunning).event(traceEvHeapObjectFree, traceHeapObjectID(addr))
 }
 
 // traceHeapObjectID creates a trace ID for a heap object at address addr.
@@ -134,18 +134,18 @@ func traceHeapObjectID(addr uintptr) traceArg {
 // GoroutineStackExists records that a goroutine stack already exists at address base with the provided size.
 func (tl traceLocker) GoroutineStackExists(base, size uintptr) {
 	order := traceCompressStackSize(size)
-	tl.eventWriter(traceGoRunning, traceProcRunning).commit(traceEvGoroutineStack, traceGoroutineStackID(base), order)
+	tl.eventWriter(traceGoRunning, traceProcRunning).event(traceEvGoroutineStack, traceGoroutineStackID(base), order)
 }
 
 // GoroutineStackAlloc records that a goroutine stack was newly allocated at address base with the provided size..
 func (tl traceLocker) GoroutineStackAlloc(base, size uintptr) {
 	order := traceCompressStackSize(size)
-	tl.eventWriter(traceGoRunning, traceProcRunning).commit(traceEvGoroutineStackAlloc, traceGoroutineStackID(base), order)
+	tl.eventWriter(traceGoRunning, traceProcRunning).event(traceEvGoroutineStackAlloc, traceGoroutineStackID(base), order)
 }
 
 // GoroutineStackFree records that a goroutine stack at address base is about to be freed.
 func (tl traceLocker) GoroutineStackFree(base uintptr) {
-	tl.eventWriter(traceGoRunning, traceProcRunning).commit(traceEvGoroutineStackFree, traceGoroutineStackID(base))
+	tl.eventWriter(traceGoRunning, traceProcRunning).event(traceEvGoroutineStackFree, traceGoroutineStackID(base))
 }
 
 // traceGoroutineStackID creates a trace ID for the goroutine stack from its base address.
diff --git a/src/runtime/traceback.go b/src/runtime/traceback.go
index 03c02f77..91c0720d 100644
--- a/src/runtime/traceback.go
+++ b/src/runtime/traceback.go
@@ -8,8 +8,8 @@ import (
 	"internal/abi"
 	"internal/bytealg"
 	"internal/goarch"
+	"internal/runtime/sys"
 	"internal/stringslite"
-	"runtime/internal/sys"
 	"unsafe"
 )
 
@@ -143,7 +143,7 @@ func (u *unwinder) initAt(pc0, sp0, lr0 uintptr, gp *g, flags unwindFlags) {
 		// on another stack. That could confuse callers quite a bit.
 		// Instead, we require that initAt and any other function that
 		// accepts an sp for the current goroutine (typically obtained by
-		// calling getcallersp) must not run on that goroutine's stack but
+		// calling GetCallerSP) must not run on that goroutine's stack but
 		// instead on the g0 stack.
 		throw("cannot trace user goroutine on its own stack")
 	}
@@ -804,7 +804,7 @@ func traceback(pc, sp, lr uintptr, gp *g) {
 }
 
 // tracebacktrap is like traceback but expects that the PC and SP were obtained
-// from a trap, not from gp->sched or gp->syscallpc/gp->syscallsp or getcallerpc/getcallersp.
+// from a trap, not from gp->sched or gp->syscallpc/gp->syscallsp or GetCallerPC/GetCallerSP.
 // Because they are from a trap instead of from a saved pair,
 // the initial PC must not be rewound to the previous instruction.
 // (All the saved pairs record a PC that is a return address, so we
@@ -1090,8 +1090,8 @@ func printAncestorTracebackFuncInfo(f funcInfo, pc uintptr) {
 //
 //go:linkname callers
 func callers(skip int, pcbuf []uintptr) int {
-	sp := getcallersp()
-	pc := getcallerpc()
+	sp := sys.GetCallerSP()
+	pc := sys.GetCallerPC()
 	gp := getg()
 	var n int
 	systemstack(func() {
@@ -1149,11 +1149,10 @@ func showfuncinfo(sf srcFunc, firstFrame bool, calleeID abi.FuncID) bool {
 // It is only for runtime functions, so ASCII A-Z is fine.
 func isExportedRuntime(name string) bool {
 	// Check and remove package qualifier.
-	n := len("runtime.")
-	if len(name) <= n || name[:n] != "runtime." {
+	name, found := stringslite.CutPrefix(name, "runtime.")
+	if !found {
 		return false
 	}
-	name = name[n:]
 	rcvr := ""
 
 	// Extract receiver type, if any.
@@ -1239,6 +1238,9 @@ func goroutineheader(gp *g) {
 	if gp.lockedm != 0 {
 		print(", locked to thread")
 	}
+	if sg := gp.syncGroup; sg != nil {
+		print(", synctest group ", sg.root.goid)
+	}
 	print("]:\n")
 }
 
diff --git a/src/runtime/traceback_system_test.go b/src/runtime/traceback_system_test.go
index ece58e80..af20f54a 100644
--- a/src/runtime/traceback_system_test.go
+++ b/src/runtime/traceback_system_test.go
@@ -23,8 +23,8 @@ import (
 )
 
 // This is the entrypoint of the child process used by
-// TestTracebackSystem. It prints a crash report to stdout.
-func crash() {
+// TestTracebackSystem/panic. It prints a crash report to stdout.
+func crashViaPanic() {
 	// Ensure that we get pc=0x%x values in the traceback.
 	debug.SetTraceback("system")
 	writeSentinel(os.Stdout)
@@ -37,6 +37,21 @@ func crash() {
 	select {}
 }
 
+// This is the entrypoint of the child process used by
+// TestTracebackSystem/trap. It prints a crash report to stdout.
+func crashViaTrap() {
+	// Ensure that we get pc=0x%x values in the traceback.
+	debug.SetTraceback("system")
+	writeSentinel(os.Stdout)
+	debug.SetCrashOutput(os.Stdout, debug.CrashOptions{})
+
+	go func() {
+		// This call is typically inlined.
+		trap1()
+	}()
+	select {}
+}
+
 func child1() {
 	child2()
 }
@@ -85,6 +100,20 @@ func child7() {
 	panic("oops")
 }
 
+func trap1() {
+	trap2()
+}
+
+var sinkPtr *int
+
+func trap2() {
+	trap3(sinkPtr)
+}
+
+func trap3(i *int) {
+	*i = 42
+}
+
 // TestTracebackSystem tests that the syntax of crash reports produced
 // by GOTRACEBACK=system (see traceback2) contains a complete,
 // parseable list of program counters for the running goroutine that
@@ -100,46 +129,75 @@ func TestTracebackSystem(t *testing.T) {
 		t.Skip("Can't read source code for this file on Android")
 	}
 
-	// Fork+exec the crashing process.
-	exe, err := os.Executable()
-	if err != nil {
-		t.Fatal(err)
-	}
-	cmd := testenv.Command(t, exe)
-	cmd.Env = append(cmd.Environ(), entrypointVar+"=crash")
-	var stdout, stderr bytes.Buffer
-	cmd.Stdout = &stdout
-	cmd.Stderr = &stderr
-	cmd.Run() // expected to crash
-	t.Logf("stderr:\n%s\nstdout: %s\n", stderr.Bytes(), stdout.Bytes())
-	crash := stdout.String()
-
-	// If the only line is the sentinel, it wasn't a crash.
-	if strings.Count(crash, "\n") < 2 {
-		t.Fatalf("child process did not produce a crash report")
-	}
-
-	// Parse the PCs out of the child's crash report.
-	pcs, err := parseStackPCs(crash)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	// Unwind the stack using this executable's symbol table.
-	got := formatStack(pcs)
-	want := `redacted.go:0: runtime.gopanic
-traceback_system_test.go:85: runtime_test.child7: 	panic("oops")
-traceback_system_test.go:68: runtime_test.child6: 	child7() // appears in stack trace
-traceback_system_test.go:59: runtime_test.child5: 	child6() // appears in stack trace
-traceback_system_test.go:53: runtime_test.child4: 	child5()
-traceback_system_test.go:49: runtime_test.child3: 	child4()
-traceback_system_test.go:45: runtime_test.child2: 	child3()
-traceback_system_test.go:41: runtime_test.child1: 	child2()
-traceback_system_test.go:35: runtime_test.crash.func1: 		child1()
+	tests := []struct{
+		name string
+		want string
+	}{
+		{
+			name: "panic",
+			want: `redacted.go:0: runtime.gopanic
+traceback_system_test.go:100: runtime_test.child7: 	panic("oops")
+traceback_system_test.go:83: runtime_test.child6: 	child7() // appears in stack trace
+traceback_system_test.go:74: runtime_test.child5: 	child6() // appears in stack trace
+traceback_system_test.go:68: runtime_test.child4: 	child5()
+traceback_system_test.go:64: runtime_test.child3: 	child4()
+traceback_system_test.go:60: runtime_test.child2: 	child3()
+traceback_system_test.go:56: runtime_test.child1: 	child2()
+traceback_system_test.go:35: runtime_test.crashViaPanic.func1: 		child1()
 redacted.go:0: runtime.goexit
-`
-	if strings.TrimSpace(got) != strings.TrimSpace(want) {
-		t.Errorf("got:\n%swant:\n%s", got, want)
+`,
+		},
+		{
+			// Test panic via trap. x/telemetry is aware that trap
+			// PCs follow runtime.sigpanic and need to be
+			// incremented to offset the decrement done by
+			// CallersFrames.
+			name: "trap",
+			want: `redacted.go:0: runtime.gopanic
+redacted.go:0: runtime.panicmem
+redacted.go:0: runtime.sigpanic
+traceback_system_test.go:114: runtime_test.trap3: 	*i = 42
+traceback_system_test.go:110: runtime_test.trap2: 	trap3(sinkPtr)
+traceback_system_test.go:104: runtime_test.trap1: 	trap2()
+traceback_system_test.go:50: runtime_test.crashViaTrap.func1: 		trap1()
+redacted.go:0: runtime.goexit
+`,
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			// Fork+exec the crashing process.
+			exe, err := os.Executable()
+			if err != nil {
+				t.Fatal(err)
+			}
+			cmd := testenv.Command(t, exe)
+			cmd.Env = append(cmd.Environ(), entrypointVar+"="+tc.name)
+			var stdout, stderr bytes.Buffer
+			cmd.Stdout = &stdout
+			cmd.Stderr = &stderr
+			cmd.Run() // expected to crash
+			t.Logf("stderr:\n%s\nstdout: %s\n", stderr.Bytes(), stdout.Bytes())
+			crash := stdout.String()
+
+			// If the only line is the sentinel, it wasn't a crash.
+			if strings.Count(crash, "\n") < 2 {
+				t.Fatalf("child process did not produce a crash report")
+			}
+
+			// Parse the PCs out of the child's crash report.
+			pcs, err := parseStackPCs(crash)
+			if err != nil {
+				t.Fatal(err)
+			}
+
+			// Unwind the stack using this executable's symbol table.
+			got := formatStack(pcs)
+			if strings.TrimSpace(got) != strings.TrimSpace(tc.want) {
+				t.Errorf("got:\n%swant:\n%s", got, tc.want)
+			}
+		})
 	}
 }
 
@@ -154,6 +212,35 @@ redacted.go:0: runtime.goexit
 //
 // (Copied from golang.org/x/telemetry/crashmonitor.parseStackPCs.)
 func parseStackPCs(crash string) ([]uintptr, error) {
+	// getSymbol parses the symbol name out of a line of the form:
+	// SYMBOL(ARGS)
+	//
+	// Note: SYMBOL may contain parens "pkg.(*T).method". However, type
+	// parameters are always replaced with ..., so they cannot introduce
+	// more parens. e.g., "pkg.(*T[...]).method".
+	//
+	// ARGS can contain parens. We want the first paren that is not
+	// immediately preceded by a ".".
+	//
+	// TODO(prattmic): This is mildly complicated and is only used to find
+	// runtime.sigpanic, so perhaps simplify this by checking explicitly
+	// for sigpanic.
+	getSymbol := func(line string) (string, error) {
+		var prev rune
+		for i, c := range line {
+			if line[i] != '(' {
+				prev = c
+				continue
+			}
+			if prev == '.' {
+				prev = c
+				continue
+			}
+			return line[:i], nil
+		}
+		return "", fmt.Errorf("no symbol for stack frame: %s", line)
+	}
+
 	// getPC parses the PC out of a line of the form:
 	//     \tFILE:LINE +0xRELPC sp=... fp=... pc=...
 	getPC := func(line string) (uint64, error) {
@@ -170,6 +257,9 @@ func parseStackPCs(crash string) ([]uintptr, error) {
 		childSentinel  = sentinel()
 		on             = false // are we in the first running goroutine?
 		lines          = strings.Split(crash, "\n")
+		symLine        = true // within a goroutine, every other line is a symbol or file/line/pc location, starting with symbol.
+		currSymbol     string
+		prevSymbol     string // symbol of the most recent previous frame with a PC.
 	)
 	for i := 0; i < len(lines); i++ {
 		line := lines[i]
@@ -212,21 +302,76 @@ func parseStackPCs(crash string) ([]uintptr, error) {
 		// Note: SYMBOL may contain parens "pkg.(*T).method"
 		// The RELPC is sometimes missing.
 
-		// Skip the symbol(args) line.
-		i++
-		if i == len(lines) {
-			break
-		}
-		line = lines[i]
+		if symLine {
+			var err error
+			currSymbol, err = getSymbol(line)
+			if err != nil {
+				return nil, fmt.Errorf("error extracting symbol: %v", err)
+			}
 
-		// Parse the PC, and correct for the parent and child's
-		// different mappings of the text section.
-		pc, err := getPC(line)
-		if err != nil {
-			// Inlined frame, perhaps; skip it.
-			continue
+			symLine = false // Next line is FILE:LINE.
+		} else {
+			// Parse the PC, and correct for the parent and child's
+			// different mappings of the text section.
+			pc, err := getPC(line)
+			if err != nil {
+				// Inlined frame, perhaps; skip it.
+
+				// Done with this frame. Next line is a new frame.
+				//
+				// Don't update prevSymbol; we only want to
+				// track frames with a PC.
+				currSymbol = ""
+				symLine = true
+				continue
+			}
+
+			pc = pc-parentSentinel+childSentinel
+
+			// If the previous frame was sigpanic, then this frame
+			// was a trap (e.g., SIGSEGV).
+			//
+			// Typically all middle frames are calls, and report
+			// the "return PC". That is, the instruction following
+			// the CALL where the callee will eventually return to.
+			//
+			// runtime.CallersFrames is aware of this property and
+			// will decrement each PC by 1 to "back up" to the
+			// location of the CALL, which is the actual line
+			// number the user expects.
+			//
+			// This does not work for traps, as a trap is not a
+			// call, so the reported PC is not the return PC, but
+			// the actual PC of the trap.
+			//
+			// runtime.Callers is aware of this and will
+			// intentionally increment trap PCs in order to correct
+			// for the decrement performed by
+			// runtime.CallersFrames. See runtime.tracebackPCs and
+			// runtume.(*unwinder).symPC.
+			//
+			// We must emulate the same behavior, otherwise we will
+			// report the location of the instruction immediately
+			// prior to the trap, which may be on a different line,
+			// or even a different inlined functions.
+			//
+			// TODO(prattmic): The runtime applies the same trap
+			// behavior for other "injected calls", see injectCall
+			// in runtime.(*unwinder).next. Do we want to handle
+			// those as well? I don't believe we'd ever see
+			// runtime.asyncPreempt or runtime.debugCallV2 in a
+			// typical crash.
+			if prevSymbol == "runtime.sigpanic" {
+				pc++
+			}
+
+			pcs = append(pcs, uintptr(pc))
+
+			// Done with this frame. Next line is a new frame.
+			prevSymbol = currSymbol
+			currSymbol = ""
+			symLine = true
 		}
-		pcs = append(pcs, uintptr(pc-parentSentinel+childSentinel))
 	}
 	return pcs, nil
 }
diff --git a/src/runtime/tracebuf.go b/src/runtime/tracebuf.go
index db4adf53..0849a578 100644
--- a/src/runtime/tracebuf.go
+++ b/src/runtime/tracebuf.go
@@ -7,7 +7,7 @@
 package runtime
 
 import (
-	"runtime/internal/sys"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
@@ -24,12 +24,31 @@ const traceBytesPerNumber = 10
 // we can change it if it's deemed too error-prone.
 type traceWriter struct {
 	traceLocker
+	exp traceExperiment
 	*traceBuf
 }
 
-// write returns an a traceWriter that writes into the current M's stream.
+// writer returns an a traceWriter that writes into the current M's stream.
+//
+// Once this is called, the caller must guard against stack growth until
+// end is called on it. Therefore, it's highly recommended to use this
+// API in a "fluent" style, for example tl.writer().event(...).end().
+// Better yet, callers just looking to write events should use eventWriter
+// when possible, which is a much safer wrapper around this function.
+//
+// nosplit to allow for safe reentrant tracing from stack growth paths.
+//
+//go:nosplit
 func (tl traceLocker) writer() traceWriter {
-	return traceWriter{traceLocker: tl, traceBuf: tl.mp.trace.buf[tl.gen%2]}
+	if debugTraceReentrancy {
+		// Checks that the invariants of this function are being upheld.
+		gp := getg()
+		if gp == gp.m.curg {
+			tl.mp.trace.oldthrowsplit = gp.throwsplit
+			gp.throwsplit = true
+		}
+	}
+	return traceWriter{traceLocker: tl, traceBuf: tl.mp.trace.buf[tl.gen%2][traceNoExperiment]}
 }
 
 // unsafeTraceWriter produces a traceWriter that doesn't lock the trace.
@@ -38,33 +57,88 @@ func (tl traceLocker) writer() traceWriter {
 // - Another traceLocker is held.
 // - trace.gen is prevented from advancing.
 //
+// This does not have the same stack growth restrictions as traceLocker.writer.
+//
 // buf may be nil.
 func unsafeTraceWriter(gen uintptr, buf *traceBuf) traceWriter {
 	return traceWriter{traceLocker: traceLocker{gen: gen}, traceBuf: buf}
 }
 
+// event writes out the bytes of an event into the event stream.
+//
+// nosplit because it's part of writing an event for an M, which must not
+// have any stack growth.
+//
+//go:nosplit
+func (w traceWriter) event(ev traceEv, args ...traceArg) traceWriter {
+	// N.B. Everything in this call must be nosplit to maintain
+	// the stack growth related invariants for writing events.
+
+	// Make sure we have room.
+	w, _ = w.ensure(1 + (len(args)+1)*traceBytesPerNumber)
+
+	// Compute the timestamp diff that we'll put in the trace.
+	ts := traceClockNow()
+	if ts <= w.traceBuf.lastTime {
+		ts = w.traceBuf.lastTime + 1
+	}
+	tsDiff := uint64(ts - w.traceBuf.lastTime)
+	w.traceBuf.lastTime = ts
+
+	// Write out event.
+	w.byte(byte(ev))
+	w.varint(tsDiff)
+	for _, arg := range args {
+		w.varint(uint64(arg))
+	}
+	return w
+}
+
 // end writes the buffer back into the m.
+//
+// nosplit because it's part of writing an event for an M, which must not
+// have any stack growth.
+//
+//go:nosplit
 func (w traceWriter) end() {
 	if w.mp == nil {
 		// Tolerate a nil mp. It makes code that creates traceWriters directly
 		// less error-prone.
 		return
 	}
-	w.mp.trace.buf[w.gen%2] = w.traceBuf
+	w.mp.trace.buf[w.gen%2][w.exp] = w.traceBuf
+	if debugTraceReentrancy {
+		// The writer is no longer live, we can drop throwsplit (if it wasn't
+		// already set upon entry).
+		gp := getg()
+		if gp == gp.m.curg {
+			gp.throwsplit = w.mp.trace.oldthrowsplit
+		}
+	}
 }
 
 // ensure makes sure that at least maxSize bytes are available to write.
 //
 // Returns whether the buffer was flushed.
+//
+// nosplit because it's part of writing an event for an M, which must not
+// have any stack growth.
+//
+//go:nosplit
 func (w traceWriter) ensure(maxSize int) (traceWriter, bool) {
 	refill := w.traceBuf == nil || !w.available(maxSize)
 	if refill {
-		w = w.refill(traceNoExperiment)
+		w = w.refill()
 	}
 	return w, refill
 }
 
 // flush puts w.traceBuf on the queue of full buffers.
+//
+// nosplit because it's part of writing an event for an M, which must not
+// have any stack growth.
+//
+//go:nosplit
 func (w traceWriter) flush() traceWriter {
 	systemstack(func() {
 		lock(&trace.lock)
@@ -78,9 +152,7 @@ func (w traceWriter) flush() traceWriter {
 }
 
 // refill puts w.traceBuf on the queue of full buffers and refresh's w's buffer.
-//
-// exp indicates whether the refilled batch should be EvExperimentalBatch.
-func (w traceWriter) refill(exp traceExperiment) traceWriter {
+func (w traceWriter) refill() traceWriter {
 	systemstack(func() {
 		lock(&trace.lock)
 		if w.traceBuf != nil {
@@ -114,11 +186,11 @@ func (w traceWriter) refill(exp traceExperiment) traceWriter {
 	}
 
 	// Write the buffer's header.
-	if exp == traceNoExperiment {
+	if w.exp == traceNoExperiment {
 		w.byte(byte(traceEvEventBatch))
 	} else {
 		w.byte(byte(traceEvExperimentalBatch))
-		w.byte(byte(exp))
+		w.byte(byte(w.exp))
 	}
 	w.varint(uint64(w.gen))
 	w.varint(uint64(mID))
@@ -179,12 +251,22 @@ type traceBuf struct {
 }
 
 // byte appends v to buf.
+//
+// nosplit because it's part of writing an event for an M, which must not
+// have any stack growth.
+//
+//go:nosplit
 func (buf *traceBuf) byte(v byte) {
 	buf.arr[buf.pos] = v
 	buf.pos++
 }
 
 // varint appends v to buf in little-endian-base-128 encoding.
+//
+// nosplit because it's part of writing an event for an M, which must not
+// have any stack growth.
+//
+//go:nosplit
 func (buf *traceBuf) varint(v uint64) {
 	pos := buf.pos
 	arr := buf.arr[pos : pos+traceBytesPerNumber]
@@ -203,6 +285,11 @@ func (buf *traceBuf) varint(v uint64) {
 // varintReserve reserves enough space in buf to hold any varint.
 //
 // Space reserved this way can be filled in with the varintAt method.
+//
+// nosplit because it's part of writing an event for an M, which must not
+// have any stack growth.
+//
+//go:nosplit
 func (buf *traceBuf) varintReserve() int {
 	p := buf.pos
 	buf.pos += traceBytesPerNumber
@@ -210,10 +297,19 @@ func (buf *traceBuf) varintReserve() int {
 }
 
 // stringData appends s's data directly to buf.
+//
+// nosplit because it's part of writing an event for an M, which must not
+// have any stack growth.
+//
+//go:nosplit
 func (buf *traceBuf) stringData(s string) {
 	buf.pos += copy(buf.arr[buf.pos:], s)
 }
 
+// nosplit because it's part of writing an event for an M, which must not
+// have any stack growth.
+//
+//go:nosplit
 func (buf *traceBuf) available(size int) bool {
 	return len(buf.arr)-buf.pos >= size
 }
@@ -222,6 +318,11 @@ func (buf *traceBuf) available(size int) bool {
 // consumes traceBytesPerNumber bytes. This is intended for when the caller
 // needs to reserve space for a varint but can't populate it until later.
 // Use varintReserve to reserve this space.
+//
+// nosplit because it's part of writing an event for an M, which must not
+// have any stack growth.
+//
+//go:nosplit
 func (buf *traceBuf) varintAt(pos int, v uint64) {
 	for i := 0; i < traceBytesPerNumber; i++ {
 		if i < traceBytesPerNumber-1 {
diff --git a/src/runtime/traceevent.go b/src/runtime/traceevent.go
index 2a869fb5..51d23688 100644
--- a/src/runtime/traceevent.go
+++ b/src/runtime/traceevent.go
@@ -8,7 +8,7 @@ package runtime
 
 import (
 	"internal/abi"
-	"runtime/internal/sys"
+	"internal/runtime/sys"
 )
 
 // Event types in the trace, args are given in square brackets.
@@ -102,7 +102,7 @@ type traceArg uint64
 // See the comment on traceWriter about style for more details as to why
 // this type and its methods are structured the way they are.
 type traceEventWriter struct {
-	w traceWriter
+	tl traceLocker
 }
 
 // eventWriter creates a new traceEventWriter. It is the main entrypoint for writing trace events.
@@ -119,54 +119,18 @@ type traceEventWriter struct {
 //
 // In this case, the default status should be traceGoBad or traceProcBad to help identify bugs sooner.
 func (tl traceLocker) eventWriter(goStatus traceGoStatus, procStatus traceProcStatus) traceEventWriter {
-	w := tl.writer()
 	if pp := tl.mp.p.ptr(); pp != nil && !pp.trace.statusWasTraced(tl.gen) && pp.trace.acquireStatus(tl.gen) {
-		w = w.writeProcStatus(uint64(pp.id), procStatus, pp.trace.inSweep)
+		tl.writer().writeProcStatus(uint64(pp.id), procStatus, pp.trace.inSweep).end()
 	}
 	if gp := tl.mp.curg; gp != nil && !gp.trace.statusWasTraced(tl.gen) && gp.trace.acquireStatus(tl.gen) {
-		w = w.writeGoStatus(uint64(gp.goid), int64(tl.mp.procid), goStatus, gp.inMarkAssist, 0 /* no stack */)
+		tl.writer().writeGoStatus(uint64(gp.goid), int64(tl.mp.procid), goStatus, gp.inMarkAssist, 0 /* no stack */).end()
 	}
-	return traceEventWriter{w}
+	return traceEventWriter{tl}
 }
 
-// commit writes out a trace event and calls end. It's a helper to make the
-// common case of writing out a single event less error-prone.
-func (e traceEventWriter) commit(ev traceEv, args ...traceArg) {
-	e = e.write(ev, args...)
-	e.end()
-}
-
-// write writes an event into the trace.
-func (e traceEventWriter) write(ev traceEv, args ...traceArg) traceEventWriter {
-	e.w = e.w.event(ev, args...)
-	return e
-}
-
-// end finishes writing to the trace. The traceEventWriter must not be used after this call.
-func (e traceEventWriter) end() {
-	e.w.end()
-}
-
-// traceEventWrite is the part of traceEvent that actually writes the event.
-func (w traceWriter) event(ev traceEv, args ...traceArg) traceWriter {
-	// Make sure we have room.
-	w, _ = w.ensure(1 + (len(args)+1)*traceBytesPerNumber)
-
-	// Compute the timestamp diff that we'll put in the trace.
-	ts := traceClockNow()
-	if ts <= w.traceBuf.lastTime {
-		ts = w.traceBuf.lastTime + 1
-	}
-	tsDiff := uint64(ts - w.traceBuf.lastTime)
-	w.traceBuf.lastTime = ts
-
-	// Write out event.
-	w.byte(byte(ev))
-	w.varint(tsDiff)
-	for _, arg := range args {
-		w.varint(uint64(arg))
-	}
-	return w
+// event writes out a trace event.
+func (e traceEventWriter) event(ev traceEv, args ...traceArg) {
+	e.tl.writer().event(ev, args...).end()
 }
 
 // stack takes a stack trace skipping the provided number of frames.
diff --git a/src/runtime/traceexp.go b/src/runtime/traceexp.go
index 9fc85df5..13eec0c0 100644
--- a/src/runtime/traceexp.go
+++ b/src/runtime/traceexp.go
@@ -4,34 +4,25 @@
 
 package runtime
 
-// traceExpWriter is a wrapper around trace writer that produces traceEvExperimentalBatch
-// batches. This means that the data written to the writer need not conform to the standard
-// trace format.
-type traceExpWriter struct {
-	traceWriter
-	exp traceExperiment
+// expWriter returns a traceWriter that writes into the current M's stream for
+// the given experiment.
+func (tl traceLocker) expWriter(exp traceExperiment) traceWriter {
+	return traceWriter{traceLocker: tl, traceBuf: tl.mp.trace.buf[tl.gen%2][exp], exp: exp}
 }
 
-// unsafeTraceExpWriter produces a traceExpWriter that doesn't lock the trace.
+// unsafeTraceExpWriter produces a traceWriter for experimental trace batches
+// that doesn't lock the trace. Data written to experimental batches need not
+// conform to the standard trace format.
 //
 // It should only be used in contexts where either:
 // - Another traceLocker is held.
 // - trace.gen is prevented from advancing.
 //
-// buf may be nil.
-func unsafeTraceExpWriter(gen uintptr, buf *traceBuf, exp traceExperiment) traceExpWriter {
-	return traceExpWriter{traceWriter{traceLocker: traceLocker{gen: gen}, traceBuf: buf}, exp}
-}
-
-// ensure makes sure that at least maxSize bytes are available to write.
+// This does not have the same stack growth restrictions as traceLocker.writer.
 //
-// Returns whether the buffer was flushed.
-func (w traceExpWriter) ensure(maxSize int) (traceExpWriter, bool) {
-	refill := w.traceBuf == nil || !w.available(maxSize)
-	if refill {
-		w.traceWriter = w.traceWriter.refill(w.exp)
-	}
-	return w, refill
+// buf may be nil.
+func unsafeTraceExpWriter(gen uintptr, buf *traceBuf, exp traceExperiment) traceWriter {
+	return traceWriter{traceLocker: traceLocker{gen: gen}, traceBuf: buf, exp: exp}
 }
 
 // traceExperiment is an enumeration of the different kinds of experiments supported for tracing.
@@ -43,6 +34,10 @@ const (
 
 	// traceExperimentAllocFree is an experiment to add alloc/free events to the trace.
 	traceExperimentAllocFree
+
+	// traceNumExperiments is the number of trace experiments (and 1 higher than
+	// the highest numbered experiment).
+	traceNumExperiments
 )
 
 // Experimental events.
diff --git a/src/runtime/tracemap.go b/src/runtime/tracemap.go
index 5b2718c8..9efa325c 100644
--- a/src/runtime/tracemap.go
+++ b/src/runtime/tracemap.go
@@ -19,7 +19,7 @@ import (
 	"internal/cpu"
 	"internal/goarch"
 	"internal/runtime/atomic"
-	"runtime/internal/sys"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
diff --git a/src/runtime/traceregion.go b/src/runtime/traceregion.go
index 43eef9c9..b45093ec 100644
--- a/src/runtime/traceregion.go
+++ b/src/runtime/traceregion.go
@@ -8,7 +8,7 @@ package runtime
 
 import (
 	"internal/runtime/atomic"
-	"runtime/internal/sys"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
diff --git a/src/runtime/traceruntime.go b/src/runtime/traceruntime.go
index 7c4cb550..284e6130 100644
--- a/src/runtime/traceruntime.go
+++ b/src/runtime/traceruntime.go
@@ -24,9 +24,11 @@ func (s *gTraceState) reset() {
 
 // mTraceState is per-M state for the tracer.
 type mTraceState struct {
-	seqlock atomic.Uintptr // seqlock indicating that this M is writing to a trace buffer.
-	buf     [2]*traceBuf   // Per-M traceBuf for writing. Indexed by trace.gen%2.
-	link    *m             // Snapshot of alllink or freelink.
+	seqlock       atomic.Uintptr                    // seqlock indicating that this M is writing to a trace buffer.
+	buf           [2][traceNumExperiments]*traceBuf // Per-M traceBuf for writing. Indexed by trace.gen%2.
+	link          *m                                // Snapshot of alllink or freelink.
+	reentered     uint32                            // Whether we've reentered tracing from within tracing.
+	oldthrowsplit bool                              // gp.throwsplit upon calling traceLocker.writer. For debugging.
 }
 
 // pTraceState is per-P state for the tracer.
@@ -100,6 +102,7 @@ const (
 	traceBlockUntilGCEnds
 	traceBlockSleep
 	traceBlockGCWeakToStrongWait
+	traceBlockSynctest
 )
 
 var traceBlockReasonStrings = [...]string{
@@ -119,6 +122,7 @@ var traceBlockReasonStrings = [...]string{
 	traceBlockUntilGCEnds:        "wait until GC ends",
 	traceBlockSleep:              "sleep",
 	traceBlockGCWeakToStrongWait: "GC weak to strong wait",
+	traceBlockSynctest:           "synctest",
 }
 
 // traceGoStopReason is an enumeration of reasons a goroutine might yield.
@@ -186,22 +190,6 @@ func traceAcquire() traceLocker {
 	return traceAcquireEnabled()
 }
 
-// traceTryAcquire is like traceAcquire, but may return an invalid traceLocker even
-// if tracing is enabled. For example, it will return !ok if traceAcquire is being
-// called with an active traceAcquire on the M (reentrant locking). This exists for
-// optimistically emitting events in the few contexts where tracing is now allowed.
-//
-// nosplit for alignment with traceTryAcquire, so it can be used in the
-// same contexts.
-//
-//go:nosplit
-func traceTryAcquire() traceLocker {
-	if !traceEnabled() {
-		return traceLocker{}
-	}
-	return traceTryAcquireEnabled()
-}
-
 // traceAcquireEnabled is the traceEnabled path for traceAcquire. It's explicitly
 // broken out to make traceAcquire inlineable to keep the overhead of the tracer
 // when it's disabled low.
@@ -218,6 +206,14 @@ func traceAcquireEnabled() traceLocker {
 	// Prevent preemption.
 	mp := acquirem()
 
+	// Check if we're already tracing. It's safe to be reentrant in general,
+	// because this function (and the invariants of traceLocker.writer) ensure
+	// that it is.
+	if mp.trace.seqlock.Load()%2 == 1 {
+		mp.trace.reentered++
+		return traceLocker{mp, trace.gen.Load()}
+	}
+
 	// Acquire the trace seqlock. This prevents traceAdvance from moving forward
 	// until all Ms are observed to be outside of their seqlock critical section.
 	//
@@ -226,7 +222,7 @@ func traceAcquireEnabled() traceLocker {
 	// doing.
 	seq := mp.trace.seqlock.Add(1)
 	if debugTraceReentrancy && seq%2 != 1 {
-		throw("bad use of trace.seqlock or tracer is reentrant")
+		throw("bad use of trace.seqlock")
 	}
 
 	// N.B. This load of gen appears redundant with the one in traceEnabled.
@@ -246,26 +242,6 @@ func traceAcquireEnabled() traceLocker {
 	return traceLocker{mp, gen}
 }
 
-// traceTryAcquireEnabled is like traceAcquireEnabled but may return an invalid
-// traceLocker under some conditions. See traceTryAcquire for more details.
-//
-// nosplit for alignment with traceAcquireEnabled, so it can be used in the
-// same contexts.
-//
-//go:nosplit
-func traceTryAcquireEnabled() traceLocker {
-	// Any time we acquire a traceLocker, we may flush a trace buffer. But
-	// buffer flushes are rare. Record the lock edge even if it doesn't happen
-	// this time.
-	lockRankMayTraceFlush()
-
-	// Check if we're already locked. If so, return an invalid traceLocker.
-	if getg().m.trace.seqlock.Load()%2 == 1 {
-		return traceLocker{}
-	}
-	return traceAcquireEnabled()
-}
-
 // ok returns true if the traceLocker is valid (i.e. tracing is enabled).
 //
 // nosplit because it's called on the syscall path when stack movement is forbidden.
@@ -281,10 +257,14 @@ func (tl traceLocker) ok() bool {
 //
 //go:nosplit
 func traceRelease(tl traceLocker) {
-	seq := tl.mp.trace.seqlock.Add(1)
-	if debugTraceReentrancy && seq%2 != 0 {
-		print("runtime: seq=", seq, "\n")
-		throw("bad use of trace.seqlock")
+	if tl.mp.trace.reentered > 0 {
+		tl.mp.trace.reentered--
+	} else {
+		seq := tl.mp.trace.seqlock.Add(1)
+		if debugTraceReentrancy && seq%2 != 0 {
+			print("runtime: seq=", seq, "\n")
+			throw("bad use of trace.seqlock")
+		}
 	}
 	releasem(tl.mp)
 }
@@ -303,7 +283,7 @@ func traceExitedSyscall() {
 
 // Gomaxprocs emits a ProcsChange event.
 func (tl traceLocker) Gomaxprocs(procs int32) {
-	tl.eventWriter(traceGoRunning, traceProcRunning).commit(traceEvProcsChange, traceArg(procs), tl.stack(1))
+	tl.eventWriter(traceGoRunning, traceProcRunning).event(traceEvProcsChange, traceArg(procs), tl.stack(1))
 }
 
 // ProcStart traces a ProcStart event.
@@ -314,14 +294,14 @@ func (tl traceLocker) ProcStart() {
 	// Procs are typically started within the scheduler when there is no user goroutine. If there is a user goroutine,
 	// it must be in _Gsyscall because the only time a goroutine is allowed to have its Proc moved around from under it
 	// is during a syscall.
-	tl.eventWriter(traceGoSyscall, traceProcIdle).commit(traceEvProcStart, traceArg(pp.id), pp.trace.nextSeq(tl.gen))
+	tl.eventWriter(traceGoSyscall, traceProcIdle).event(traceEvProcStart, traceArg(pp.id), pp.trace.nextSeq(tl.gen))
 }
 
 // ProcStop traces a ProcStop event.
 func (tl traceLocker) ProcStop(pp *p) {
 	// The only time a goroutine is allowed to have its Proc moved around
 	// from under it is during a syscall.
-	tl.eventWriter(traceGoSyscall, traceProcRunning).commit(traceEvProcStop)
+	tl.eventWriter(traceGoSyscall, traceProcRunning).event(traceEvProcStop)
 }
 
 // GCActive traces a GCActive event.
@@ -329,7 +309,7 @@ func (tl traceLocker) ProcStop(pp *p) {
 // Must be emitted by an actively running goroutine on an active P. This restriction can be changed
 // easily and only depends on where it's currently called.
 func (tl traceLocker) GCActive() {
-	tl.eventWriter(traceGoRunning, traceProcRunning).commit(traceEvGCActive, traceArg(trace.seqGC))
+	tl.eventWriter(traceGoRunning, traceProcRunning).event(traceEvGCActive, traceArg(trace.seqGC))
 	// N.B. Only one GC can be running at a time, so this is naturally
 	// serialized by the caller.
 	trace.seqGC++
@@ -340,7 +320,7 @@ func (tl traceLocker) GCActive() {
 // Must be emitted by an actively running goroutine on an active P. This restriction can be changed
 // easily and only depends on where it's currently called.
 func (tl traceLocker) GCStart() {
-	tl.eventWriter(traceGoRunning, traceProcRunning).commit(traceEvGCBegin, traceArg(trace.seqGC), tl.stack(3))
+	tl.eventWriter(traceGoRunning, traceProcRunning).event(traceEvGCBegin, traceArg(trace.seqGC), tl.stack(3))
 	// N.B. Only one GC can be running at a time, so this is naturally
 	// serialized by the caller.
 	trace.seqGC++
@@ -351,7 +331,7 @@ func (tl traceLocker) GCStart() {
 // Must be emitted by an actively running goroutine on an active P. This restriction can be changed
 // easily and only depends on where it's currently called.
 func (tl traceLocker) GCDone() {
-	tl.eventWriter(traceGoRunning, traceProcRunning).commit(traceEvGCEnd, traceArg(trace.seqGC))
+	tl.eventWriter(traceGoRunning, traceProcRunning).event(traceEvGCEnd, traceArg(trace.seqGC))
 	// N.B. Only one GC can be running at a time, so this is naturally
 	// serialized by the caller.
 	trace.seqGC++
@@ -361,14 +341,14 @@ func (tl traceLocker) GCDone() {
 func (tl traceLocker) STWStart(reason stwReason) {
 	// Although the current P may be in _Pgcstop here, we model the P as running during the STW. This deviates from the
 	// runtime's state tracking, but it's more accurate and doesn't result in any loss of information.
-	tl.eventWriter(traceGoRunning, traceProcRunning).commit(traceEvSTWBegin, tl.string(reason.String()), tl.stack(2))
+	tl.eventWriter(traceGoRunning, traceProcRunning).event(traceEvSTWBegin, tl.string(reason.String()), tl.stack(2))
 }
 
 // STWDone traces a STWEnd event.
 func (tl traceLocker) STWDone() {
 	// Although the current P may be in _Pgcstop here, we model the P as running during the STW. This deviates from the
 	// runtime's state tracking, but it's more accurate and doesn't result in any loss of information.
-	tl.eventWriter(traceGoRunning, traceProcRunning).commit(traceEvSTWEnd)
+	tl.eventWriter(traceGoRunning, traceProcRunning).event(traceEvSTWEnd)
 }
 
 // GCSweepStart prepares to trace a sweep loop. This does not
@@ -400,7 +380,7 @@ func (tl traceLocker) GCSweepSpan(bytesSwept uintptr) {
 	pp := tl.mp.p.ptr()
 	if pp.trace.maySweep {
 		if pp.trace.swept == 0 {
-			tl.eventWriter(traceGoRunning, traceProcRunning).commit(traceEvGCSweepBegin, tl.stack(1))
+			tl.eventWriter(traceGoRunning, traceProcRunning).event(traceEvGCSweepBegin, tl.stack(1))
 			pp.trace.inSweep = true
 		}
 		pp.trace.swept += bytesSwept
@@ -418,7 +398,7 @@ func (tl traceLocker) GCSweepDone() {
 		throw("missing traceGCSweepStart")
 	}
 	if pp.trace.inSweep {
-		tl.eventWriter(traceGoRunning, traceProcRunning).commit(traceEvGCSweepEnd, traceArg(pp.trace.swept), traceArg(pp.trace.reclaimed))
+		tl.eventWriter(traceGoRunning, traceProcRunning).event(traceEvGCSweepEnd, traceArg(pp.trace.swept), traceArg(pp.trace.reclaimed))
 		pp.trace.inSweep = false
 	}
 	pp.trace.maySweep = false
@@ -426,12 +406,12 @@ func (tl traceLocker) GCSweepDone() {
 
 // GCMarkAssistStart emits a MarkAssistBegin event.
 func (tl traceLocker) GCMarkAssistStart() {
-	tl.eventWriter(traceGoRunning, traceProcRunning).commit(traceEvGCMarkAssistBegin, tl.stack(1))
+	tl.eventWriter(traceGoRunning, traceProcRunning).event(traceEvGCMarkAssistBegin, tl.stack(1))
 }
 
 // GCMarkAssistDone emits a MarkAssistEnd event.
 func (tl traceLocker) GCMarkAssistDone() {
-	tl.eventWriter(traceGoRunning, traceProcRunning).commit(traceEvGCMarkAssistEnd)
+	tl.eventWriter(traceGoRunning, traceProcRunning).event(traceEvGCMarkAssistEnd)
 }
 
 // GoCreate emits a GoCreate event.
@@ -441,7 +421,7 @@ func (tl traceLocker) GoCreate(newg *g, pc uintptr, blocked bool) {
 	if blocked {
 		ev = traceEvGoCreateBlocked
 	}
-	tl.eventWriter(traceGoRunning, traceProcRunning).commit(ev, traceArg(newg.goid), tl.startPC(pc), tl.stack(2))
+	tl.eventWriter(traceGoRunning, traceProcRunning).event(ev, traceArg(newg.goid), tl.startPC(pc), tl.stack(2))
 }
 
 // GoStart emits a GoStart event.
@@ -451,18 +431,17 @@ func (tl traceLocker) GoStart() {
 	gp := getg().m.curg
 	pp := gp.m.p
 	w := tl.eventWriter(traceGoRunnable, traceProcRunning)
-	w = w.write(traceEvGoStart, traceArg(gp.goid), gp.trace.nextSeq(tl.gen))
+	w.event(traceEvGoStart, traceArg(gp.goid), gp.trace.nextSeq(tl.gen))
 	if pp.ptr().gcMarkWorkerMode != gcMarkWorkerNotWorker {
-		w = w.write(traceEvGoLabel, trace.markWorkerLabels[tl.gen%2][pp.ptr().gcMarkWorkerMode])
+		w.event(traceEvGoLabel, trace.markWorkerLabels[tl.gen%2][pp.ptr().gcMarkWorkerMode])
 	}
-	w.end()
 }
 
 // GoEnd emits a GoDestroy event.
 //
 // TODO(mknyszek): Rename this to GoDestroy.
 func (tl traceLocker) GoEnd() {
-	tl.eventWriter(traceGoRunning, traceProcRunning).commit(traceEvGoDestroy)
+	tl.eventWriter(traceGoRunning, traceProcRunning).event(traceEvGoDestroy)
 }
 
 // GoSched emits a GoStop event with a GoSched reason.
@@ -477,7 +456,7 @@ func (tl traceLocker) GoPreempt() {
 
 // GoStop emits a GoStop event with the provided reason.
 func (tl traceLocker) GoStop(reason traceGoStopReason) {
-	tl.eventWriter(traceGoRunning, traceProcRunning).commit(traceEvGoStop, traceArg(trace.goStopReasons[tl.gen%2][reason]), tl.stack(1))
+	tl.eventWriter(traceGoRunning, traceProcRunning).event(traceEvGoStop, traceArg(trace.goStopReasons[tl.gen%2][reason]), tl.stack(1))
 }
 
 // GoPark emits a GoBlock event with the provided reason.
@@ -485,44 +464,38 @@ func (tl traceLocker) GoStop(reason traceGoStopReason) {
 // TODO(mknyszek): Replace traceBlockReason with waitReason. It's silly
 // that we have both, and waitReason is way more descriptive.
 func (tl traceLocker) GoPark(reason traceBlockReason, skip int) {
-	tl.eventWriter(traceGoRunning, traceProcRunning).commit(traceEvGoBlock, traceArg(trace.goBlockReasons[tl.gen%2][reason]), tl.stack(skip))
+	tl.eventWriter(traceGoRunning, traceProcRunning).event(traceEvGoBlock, traceArg(trace.goBlockReasons[tl.gen%2][reason]), tl.stack(skip))
 }
 
 // GoUnpark emits a GoUnblock event.
 func (tl traceLocker) GoUnpark(gp *g, skip int) {
 	// Emit a GoWaiting status if necessary for the unblocked goroutine.
-	w := tl.eventWriter(traceGoRunning, traceProcRunning)
-	// Careful: don't use the event writer. We never want status or in-progress events
-	// to trigger more in-progress events.
-	w.w = emitUnblockStatus(w.w, gp, tl.gen)
-	w.commit(traceEvGoUnblock, traceArg(gp.goid), gp.trace.nextSeq(tl.gen), tl.stack(skip))
+	tl.emitUnblockStatus(gp, tl.gen)
+	tl.eventWriter(traceGoRunning, traceProcRunning).event(traceEvGoUnblock, traceArg(gp.goid), gp.trace.nextSeq(tl.gen), tl.stack(skip))
 }
 
-// GoCoroswitch emits a GoSwitch event. If destroy is true, the calling goroutine
+// GoSwitch emits a GoSwitch event. If destroy is true, the calling goroutine
 // is simultaneously being destroyed.
 func (tl traceLocker) GoSwitch(nextg *g, destroy bool) {
 	// Emit a GoWaiting status if necessary for the unblocked goroutine.
+	tl.emitUnblockStatus(nextg, tl.gen)
 	w := tl.eventWriter(traceGoRunning, traceProcRunning)
-	// Careful: don't use the event writer. We never want status or in-progress events
-	// to trigger more in-progress events.
-	w.w = emitUnblockStatus(w.w, nextg, tl.gen)
 	ev := traceEvGoSwitch
 	if destroy {
 		ev = traceEvGoSwitchDestroy
 	}
-	w.commit(ev, traceArg(nextg.goid), nextg.trace.nextSeq(tl.gen))
+	w.event(ev, traceArg(nextg.goid), nextg.trace.nextSeq(tl.gen))
 }
 
 // emitUnblockStatus emits a GoStatus GoWaiting event for a goroutine about to be
 // unblocked to the trace writer.
-func emitUnblockStatus(w traceWriter, gp *g, gen uintptr) traceWriter {
+func (tl traceLocker) emitUnblockStatus(gp *g, gen uintptr) {
 	if !gp.trace.statusWasTraced(gen) && gp.trace.acquireStatus(gen) {
 		// TODO(go.dev/issue/65634): Although it would be nice to add a stack trace here of gp,
 		// we cannot safely do so. gp is in _Gwaiting and so we don't have ownership of its stack.
 		// We can fix this by acquiring the goroutine's scan bit.
-		w = w.writeGoStatus(gp.goid, -1, traceGoWaiting, gp.inMarkAssist, 0)
+		tl.writer().writeGoStatus(gp.goid, -1, traceGoWaiting, gp.inMarkAssist, 0).end()
 	}
-	return w
 }
 
 // GoSysCall emits a GoSyscallBegin event.
@@ -532,7 +505,7 @@ func (tl traceLocker) GoSysCall() {
 	// Scribble down the M that the P is currently attached to.
 	pp := tl.mp.p.ptr()
 	pp.trace.mSyscallID = int64(tl.mp.procid)
-	tl.eventWriter(traceGoRunning, traceProcRunning).commit(traceEvGoSyscallBegin, pp.trace.nextSeq(tl.gen), tl.stack(1))
+	tl.eventWriter(traceGoRunning, traceProcRunning).event(traceEvGoSyscallBegin, pp.trace.nextSeq(tl.gen), tl.stack(1))
 }
 
 // GoSysExit emits a GoSyscallEnd event, possibly along with a GoSyscallBlocked event
@@ -553,7 +526,7 @@ func (tl traceLocker) GoSysExit(lostP bool) {
 	} else {
 		tl.mp.p.ptr().trace.mSyscallID = -1
 	}
-	tl.eventWriter(traceGoSyscall, procStatus).commit(ev)
+	tl.eventWriter(traceGoSyscall, procStatus).event(ev)
 }
 
 // ProcSteal indicates that our current M stole a P from another M.
@@ -566,6 +539,17 @@ func (tl traceLocker) ProcSteal(pp *p, inSyscall bool) {
 	mStolenFrom := pp.trace.mSyscallID
 	pp.trace.mSyscallID = -1
 
+	// Emit the status of the P we're stealing. We may be just about to do this when creating the event
+	// writer but it's not guaranteed, even if inSyscall is true. Although it might seem like from a
+	// syscall context we're always stealing a P for ourselves, we may have not wired it up yet (so
+	// it wouldn't be visible to eventWriter) or we may not even intend to wire it up to ourselves
+	// at all (e.g. entersyscall_gcwait).
+	if !pp.trace.statusWasTraced(tl.gen) && pp.trace.acquireStatus(tl.gen) {
+		// Careful: don't use the event writer. We never want status or in-progress events
+		// to trigger more in-progress events.
+		tl.writer().writeProcStatus(uint64(pp.id), traceProcSyscallAbandoned, pp.trace.inSweep).end()
+	}
+
 	// The status of the proc and goroutine, if we need to emit one here, is not evident from the
 	// context of just emitting this event alone. There are two cases. Either we're trying to steal
 	// the P just to get its attention (e.g. STW or sysmon retake) or we're trying to steal a P for
@@ -578,24 +562,12 @@ func (tl traceLocker) ProcSteal(pp *p, inSyscall bool) {
 		goStatus = traceGoSyscall
 		procStatus = traceProcSyscallAbandoned
 	}
-	w := tl.eventWriter(goStatus, procStatus)
-
-	// Emit the status of the P we're stealing. We may have *just* done this when creating the event
-	// writer but it's not guaranteed, even if inSyscall is true. Although it might seem like from a
-	// syscall context we're always stealing a P for ourselves, we may have not wired it up yet (so
-	// it wouldn't be visible to eventWriter) or we may not even intend to wire it up to ourselves
-	// at all (e.g. entersyscall_gcwait).
-	if !pp.trace.statusWasTraced(tl.gen) && pp.trace.acquireStatus(tl.gen) {
-		// Careful: don't use the event writer. We never want status or in-progress events
-		// to trigger more in-progress events.
-		w.w = w.w.writeProcStatus(uint64(pp.id), traceProcSyscallAbandoned, pp.trace.inSweep)
-	}
-	w.commit(traceEvProcSteal, traceArg(pp.id), pp.trace.nextSeq(tl.gen), traceArg(mStolenFrom))
+	tl.eventWriter(goStatus, procStatus).event(traceEvProcSteal, traceArg(pp.id), pp.trace.nextSeq(tl.gen), traceArg(mStolenFrom))
 }
 
 // HeapAlloc emits a HeapAlloc event.
 func (tl traceLocker) HeapAlloc(live uint64) {
-	tl.eventWriter(traceGoRunning, traceProcRunning).commit(traceEvHeapAlloc, traceArg(live))
+	tl.eventWriter(traceGoRunning, traceProcRunning).event(traceEvHeapAlloc, traceArg(live))
 }
 
 // HeapGoal reads the current heap goal and emits a HeapGoal event.
@@ -605,7 +577,7 @@ func (tl traceLocker) HeapGoal() {
 		// Heap-based triggering is disabled.
 		heapGoal = 0
 	}
-	tl.eventWriter(traceGoRunning, traceProcRunning).commit(traceEvHeapGoal, traceArg(heapGoal))
+	tl.eventWriter(traceGoRunning, traceProcRunning).event(traceEvHeapGoal, traceArg(heapGoal))
 }
 
 // GoCreateSyscall indicates that a goroutine has transitioned from dead to GoSyscall.
@@ -618,7 +590,7 @@ func (tl traceLocker) GoCreateSyscall(gp *g) {
 	// N.B. We should never trace a status for this goroutine (which we're currently running on),
 	// since we want this to appear like goroutine creation.
 	gp.trace.setStatusTraced(tl.gen)
-	tl.eventWriter(traceGoBad, traceProcBad).commit(traceEvGoCreateSyscall, traceArg(gp.goid))
+	tl.eventWriter(traceGoBad, traceProcBad).event(traceEvGoCreateSyscall, traceArg(gp.goid))
 }
 
 // GoDestroySyscall indicates that a goroutine has transitioned from GoSyscall to dead.
@@ -630,7 +602,7 @@ func (tl traceLocker) GoCreateSyscall(gp *g) {
 func (tl traceLocker) GoDestroySyscall() {
 	// N.B. If we trace a status here, we must never have a P, and we must be on a goroutine
 	// that is in the syscall state.
-	tl.eventWriter(traceGoSyscall, traceProcBad).commit(traceEvGoDestroySyscall)
+	tl.eventWriter(traceGoSyscall, traceProcBad).event(traceEvGoDestroySyscall)
 }
 
 // To access runtime functions from runtime/trace.
@@ -645,7 +617,7 @@ func trace_userTaskCreate(id, parentID uint64, taskType string) {
 		// Need to do this check because the caller won't have it.
 		return
 	}
-	tl.eventWriter(traceGoRunning, traceProcRunning).commit(traceEvUserTaskBegin, traceArg(id), traceArg(parentID), tl.string(taskType), tl.stack(3))
+	tl.eventWriter(traceGoRunning, traceProcRunning).event(traceEvUserTaskBegin, traceArg(id), traceArg(parentID), tl.string(taskType), tl.stack(3))
 	traceRelease(tl)
 }
 
@@ -658,11 +630,11 @@ func trace_userTaskEnd(id uint64) {
 		// Need to do this check because the caller won't have it.
 		return
 	}
-	tl.eventWriter(traceGoRunning, traceProcRunning).commit(traceEvUserTaskEnd, traceArg(id), tl.stack(2))
+	tl.eventWriter(traceGoRunning, traceProcRunning).event(traceEvUserTaskEnd, traceArg(id), tl.stack(2))
 	traceRelease(tl)
 }
 
-// trace_userTaskEnd emits a UserRegionBegin or UserRegionEnd event,
+// trace_userRegion emits a UserRegionBegin or UserRegionEnd event,
 // depending on mode (0 == Begin, 1 == End).
 //
 // TODO(mknyszek): Just make this two functions.
@@ -683,11 +655,11 @@ func trace_userRegion(id, mode uint64, name string) {
 	default:
 		return
 	}
-	tl.eventWriter(traceGoRunning, traceProcRunning).commit(ev, traceArg(id), tl.string(name), tl.stack(3))
+	tl.eventWriter(traceGoRunning, traceProcRunning).event(ev, traceArg(id), tl.string(name), tl.stack(3))
 	traceRelease(tl)
 }
 
-// trace_userTaskEnd emits a UserRegionBegin or UserRegionEnd event.
+// trace_userLog emits a UserRegionBegin or UserRegionEnd event.
 //
 //go:linkname trace_userLog runtime/trace.userLog
 func trace_userLog(id uint64, category, message string) {
@@ -696,7 +668,7 @@ func trace_userLog(id uint64, category, message string) {
 		// Need to do this check because the caller won't have it.
 		return
 	}
-	tl.eventWriter(traceGoRunning, traceProcRunning).commit(traceEvUserLog, traceArg(id), tl.string(category), tl.uniqueString(message), tl.stack(3))
+	tl.eventWriter(traceGoRunning, traceProcRunning).event(traceEvUserLog, traceArg(id), tl.string(category), tl.uniqueString(message), tl.stack(3))
 	traceRelease(tl)
 }
 
@@ -718,16 +690,18 @@ func traceThreadDestroy(mp *m) {
 	// as well.
 	seq := mp.trace.seqlock.Add(1)
 	if debugTraceReentrancy && seq%2 != 1 {
-		throw("bad use of trace.seqlock or tracer is reentrant")
+		throw("bad use of trace.seqlock")
 	}
 	systemstack(func() {
 		lock(&trace.lock)
 		for i := range mp.trace.buf {
-			if mp.trace.buf[i] != nil {
-				// N.B. traceBufFlush accepts a generation, but it
-				// really just cares about gen%2.
-				traceBufFlush(mp.trace.buf[i], uintptr(i))
-				mp.trace.buf[i] = nil
+			for exp, buf := range mp.trace.buf[i] {
+				if buf != nil {
+					// N.B. traceBufFlush accepts a generation, but it
+					// really just cares about gen%2.
+					traceBufFlush(buf, uintptr(i))
+					mp.trace.buf[i][exp] = nil
+				}
 			}
 		}
 		unlock(&trace.lock)
diff --git a/src/runtime/tracestatus.go b/src/runtime/tracestatus.go
index 77ccdd13..425ac37b 100644
--- a/src/runtime/tracestatus.go
+++ b/src/runtime/tracestatus.go
@@ -46,6 +46,11 @@ const (
 )
 
 // writeGoStatus emits a GoStatus event as well as any active ranges on the goroutine.
+//
+// nosplit because it's part of writing an event for an M, which must not
+// have any stack growth.
+//
+//go:nosplit
 func (w traceWriter) writeGoStatus(goid uint64, mid int64, status traceGoStatus, markAssist bool, stackID uint64) traceWriter {
 	// The status should never be bad. Some invariant must have been violated.
 	if status == traceGoBad {
@@ -71,6 +76,11 @@ func (w traceWriter) writeGoStatus(goid uint64, mid int64, status traceGoStatus,
 //
 // The caller must fully own pp and it must be prevented from transitioning (e.g. this can be
 // called by a forEachP callback or from a STW).
+//
+// nosplit because it's part of writing an event for an M, which must not
+// have any stack growth.
+//
+//go:nosplit
 func (w traceWriter) writeProcStatusForP(pp *p, inSTW bool) traceWriter {
 	if !pp.trace.acquireStatus(w.gen) {
 		return w
@@ -106,6 +116,11 @@ func (w traceWriter) writeProcStatusForP(pp *p, inSTW bool) traceWriter {
 //
 // The caller must have taken ownership of a P's status writing, and the P must be
 // prevented from transitioning.
+//
+// nosplit because it's part of writing an event for an M, which must not
+// have any stack growth.
+//
+//go:nosplit
 func (w traceWriter) writeProcStatus(pid uint64, status traceProcStatus, inSweep bool) traceWriter {
 	// The status should never be bad. Some invariant must have been violated.
 	if status == traceProcBad {
@@ -126,6 +141,11 @@ func (w traceWriter) writeProcStatus(pid uint64, status traceProcStatus, inSweep
 // goStatusToTraceGoStatus translates the internal status to tracGoStatus.
 //
 // status must not be _Gdead or any status whose name has the suffix "_unused."
+//
+// nosplit because it's part of writing an event for an M, which must not
+// have any stack growth.
+//
+//go:nosplit
 func goStatusToTraceGoStatus(status uint32, wr waitReason) traceGoStatus {
 	// N.B. Ignore the _Gscan bit. We don't model it in the tracer.
 	var tgs traceGoStatus
@@ -177,6 +197,11 @@ type traceSchedResourceState struct {
 }
 
 // acquireStatus acquires the right to emit a Status event for the scheduling resource.
+//
+// nosplit because it's part of writing an event for an M, which must not
+// have any stack growth.
+//
+//go:nosplit
 func (r *traceSchedResourceState) acquireStatus(gen uintptr) bool {
 	if !r.statusTraced[gen%3].CompareAndSwap(0, 1) {
 		return false
diff --git a/src/runtime/tracetime.go b/src/runtime/tracetime.go
index 57101241..d5ee2b07 100644
--- a/src/runtime/tracetime.go
+++ b/src/runtime/tracetime.go
@@ -47,7 +47,8 @@ type traceTime uint64
 // the timestamp from is specific to tracing, and shouldn't be mixed with other
 // clock sources.
 //
-// nosplit because it's called from exitsyscall, which is nosplit.
+// nosplit because it's called from exitsyscall and various trace writing functions,
+// which are nosplit.
 //
 // traceClockNow is called by golang.org/x/exp/trace using linkname.
 //
diff --git a/src/runtime/tracetype.go b/src/runtime/tracetype.go
index b27a6909..d9e340f6 100644
--- a/src/runtime/tracetype.go
+++ b/src/runtime/tracetype.go
@@ -43,7 +43,7 @@ func (t *traceTypeTable) dump(gen uintptr) {
 	t.tab.reset()
 }
 
-func dumpTypesRec(node *traceMapNode, w traceExpWriter) traceExpWriter {
+func dumpTypesRec(node *traceMapNode, w traceWriter) traceWriter {
 	typ := (*abi.Type)(*(*unsafe.Pointer)(unsafe.Pointer(&node.data[0])))
 	typName := toRType(typ).string()
 
diff --git a/src/runtime/type.go b/src/runtime/type.go
index 20134075..1edf9c9d 100644
--- a/src/runtime/type.go
+++ b/src/runtime/type.go
@@ -8,6 +8,9 @@ package runtime
 
 import (
 	"internal/abi"
+	"internal/goarch"
+	"internal/goexperiment"
+	"internal/runtime/atomic"
 	"unsafe"
 )
 
@@ -72,6 +75,184 @@ func (t rtype) pkgpath() string {
 	return ""
 }
 
+// getGCMask returns the pointer/nonpointer bitmask for type t.
+//
+// nosplit because it is used during write barriers and must not be preempted.
+//
+//go:nosplit
+func getGCMask(t *_type) *byte {
+	if t.TFlag&abi.TFlagGCMaskOnDemand != 0 {
+		// Split the rest into getGCMaskOnDemand so getGCMask itself is inlineable.
+		return getGCMaskOnDemand(t)
+	}
+	return t.GCData
+}
+
+// inProgress is a byte whose address is a sentinel indicating that
+// some thread is currently building the GC bitmask for a type.
+var inProgress byte
+
+// nosplit because it is used during write barriers and must not be preempted.
+//
+//go:nosplit
+func getGCMaskOnDemand(t *_type) *byte {
+	// For large types, GCData doesn't point directly to a bitmask.
+	// Instead it points to a pointer to a bitmask, and the runtime
+	// is responsible for (on first use) creating the bitmask and
+	// storing a pointer to it in that slot.
+	// TODO: we could use &t.GCData as the slot, but types are
+	// in read-only memory currently.
+	addr := unsafe.Pointer(t.GCData)
+
+	if GOOS == "aix" {
+		addr = add(addr, firstmoduledata.data-aixStaticDataBase)
+	}
+
+	for {
+		p := (*byte)(atomic.Loadp(addr))
+		switch p {
+		default: // Already built.
+			return p
+		case &inProgress: // Someone else is currently building it.
+			// Just wait until the builder is done.
+			// We can't block here, so spinning while having
+			// the OS thread yield is about the best we can do.
+			osyield()
+			continue
+		case nil: // Not built yet.
+			// Attempt to get exclusive access to build it.
+			if !atomic.Casp1((*unsafe.Pointer)(addr), nil, unsafe.Pointer(&inProgress)) {
+				continue
+			}
+
+			// Build gcmask for this type.
+			bytes := goarch.PtrSize * divRoundUp(t.PtrBytes/goarch.PtrSize, 8*goarch.PtrSize)
+			p = (*byte)(persistentalloc(bytes, goarch.PtrSize, &memstats.other_sys))
+			systemstack(func() {
+				buildGCMask(t, bitCursor{ptr: p, n: 0})
+			})
+
+			// Store the newly-built gcmask for future callers.
+			atomic.StorepNoWB(addr, unsafe.Pointer(p))
+			return p
+		}
+	}
+}
+
+// A bitCursor is a simple cursor to memory to which we
+// can write a set of bits.
+type bitCursor struct {
+	ptr *byte   // base of region
+	n   uintptr // cursor points to bit n of region
+}
+
+// Write to b cnt bits starting at bit 0 of data.
+// Requires cnt>0.
+func (b bitCursor) write(data *byte, cnt uintptr) {
+	// Starting byte for writing.
+	p := addb(b.ptr, b.n/8)
+
+	// Note: if we're starting halfway through a byte, we load the
+	// existing lower bits so we don't clobber them.
+	n := b.n % 8                    // # of valid bits in buf
+	buf := uintptr(*p) & (1< 8 {
+		// Read 8 more bits, now buf has 8-15 valid bits in it.
+		buf |= uintptr(*data) << n
+		n += 8
+		data = addb(data, 1)
+		cnt -= 8
+		// Write 8 of the buffered bits out.
+		*p = byte(buf)
+		buf >>= 8
+		n -= 8
+		p = addb(p, 1)
+	}
+	// Read remaining bits.
+	buf |= (uintptr(*data) & (1< 8 {
+		*p = byte(buf)
+		buf >>= 8
+		n -= 8
+		p = addb(p, 1)
+	}
+	*p &^= 1< t.Size_/2 {
+				// Avoid recursive call for field type that
+				// is larger than half of the parent type.
+				// There can be only one.
+				bigField = f
+				continue
+			}
+			buildGCMask(ft, dst.offset(f.Offset/goarch.PtrSize))
+		}
+		if bigField.Typ != nil {
+			// Note: this case causes bits to be written out of order.
+			t = bigField.Typ
+			dst = dst.offset(bigField.Offset / goarch.PtrSize)
+			goto top
+		}
+	default:
+		throw("unexpected kind")
+	}
+}
+
 // reflectOffs holds type offsets defined at run time by the reflect package.
 //
 // When a type is defined at run time, its *rtype data lives on the heap.
@@ -106,15 +287,6 @@ func reflectOffsUnlock() {
 	unlock(&reflectOffs.lock)
 }
 
-// resolveNameOff should be an internal detail,
-// but widely used packages access it using linkname.
-// Notable members of the hall of shame include:
-//   - github.com/cloudwego/frugal
-//
-// Do not remove or change the type signature.
-// See go.dev/issue/67401.
-//
-//go:linkname resolveNameOff
 func resolveNameOff(ptrInModule unsafe.Pointer, off nameOff) name {
 	if off == 0 {
 		return name{}
@@ -149,15 +321,6 @@ func (t rtype) nameOff(off nameOff) name {
 	return resolveNameOff(unsafe.Pointer(t.Type), off)
 }
 
-// resolveTypeOff should be an internal detail,
-// but widely used packages access it using linkname.
-// Notable members of the hall of shame include:
-//   - github.com/cloudwego/frugal
-//
-// Do not remove or change the type signature.
-// See go.dev/issue/67401.
-//
-//go:linkname resolveTypeOff
 func resolveTypeOff(ptrInModule unsafe.Pointer, off typeOff) *_type {
 	if off == 0 || off == -1 {
 		// -1 is the sentinel value for unreachable code.
@@ -235,8 +398,6 @@ type uncommontype = abi.UncommonType
 
 type interfacetype = abi.InterfaceType
 
-type maptype = abi.MapType
-
 type arraytype = abi.ArrayType
 
 type chantype = abi.ChanType
@@ -439,8 +600,13 @@ func typesEqual(t, v *_type, seen map[_typePair]struct{}) bool {
 		}
 		return true
 	case abi.Map:
-		mt := (*maptype)(unsafe.Pointer(t))
-		mv := (*maptype)(unsafe.Pointer(v))
+		if goexperiment.SwissMap {
+			mt := (*abi.SwissMapType)(unsafe.Pointer(t))
+			mv := (*abi.SwissMapType)(unsafe.Pointer(v))
+			return typesEqual(mt.Key, mv.Key, seen) && typesEqual(mt.Elem, mv.Elem, seen)
+		}
+		mt := (*abi.OldMapType)(unsafe.Pointer(t))
+		mv := (*abi.OldMapType)(unsafe.Pointer(v))
 		return typesEqual(mt.Key, mv.Key, seen) && typesEqual(mt.Elem, mv.Elem, seen)
 	case abi.Pointer:
 		pt := (*ptrtype)(unsafe.Pointer(t))
diff --git a/src/runtime/unsafe.go b/src/runtime/unsafe.go
index ca428b56..185eae0f 100644
--- a/src/runtime/unsafe.go
+++ b/src/runtime/unsafe.go
@@ -5,7 +5,8 @@
 package runtime
 
 import (
-	"runtime/internal/math"
+	"internal/runtime/math"
+	"internal/runtime/sys"
 	"unsafe"
 )
 
@@ -52,21 +53,21 @@ func panicunsafestringnilptr() {
 // Keep this code in sync with cmd/compile/internal/walk/builtin.go:walkUnsafeSlice
 func unsafeslice(et *_type, ptr unsafe.Pointer, len int) {
 	if len < 0 {
-		panicunsafeslicelen1(getcallerpc())
+		panicunsafeslicelen1(sys.GetCallerPC())
 	}
 
 	if et.Size_ == 0 {
 		if ptr == nil && len > 0 {
-			panicunsafeslicenilptr1(getcallerpc())
+			panicunsafeslicenilptr1(sys.GetCallerPC())
 		}
 	}
 
 	mem, overflow := math.MulUintptr(et.Size_, uintptr(len))
 	if overflow || mem > -uintptr(ptr) {
 		if ptr == nil {
-			panicunsafeslicenilptr1(getcallerpc())
+			panicunsafeslicenilptr1(sys.GetCallerPC())
 		}
-		panicunsafeslicelen1(getcallerpc())
+		panicunsafeslicelen1(sys.GetCallerPC())
 	}
 }
 
@@ -74,7 +75,7 @@ func unsafeslice(et *_type, ptr unsafe.Pointer, len int) {
 func unsafeslice64(et *_type, ptr unsafe.Pointer, len64 int64) {
 	len := int(len64)
 	if int64(len) != len64 {
-		panicunsafeslicelen1(getcallerpc())
+		panicunsafeslicelen1(sys.GetCallerPC())
 	}
 	unsafeslice(et, ptr, len)
 }
@@ -92,7 +93,7 @@ func unsafeslicecheckptr(et *_type, ptr unsafe.Pointer, len64 int64) {
 func panicunsafeslicelen() {
 	// This is called only from compiler-generated code, so we can get the
 	// source of the panic.
-	panicunsafeslicelen1(getcallerpc())
+	panicunsafeslicelen1(sys.GetCallerPC())
 }
 
 //go:yeswritebarrierrec
@@ -104,7 +105,7 @@ func panicunsafeslicelen1(pc uintptr) {
 func panicunsafeslicenilptr() {
 	// This is called only from compiler-generated code, so we can get the
 	// source of the panic.
-	panicunsafeslicenilptr1(getcallerpc())
+	panicunsafeslicenilptr1(sys.GetCallerPC())
 }
 
 //go:yeswritebarrierrec
diff --git a/src/runtime/vdso_linux.go b/src/runtime/vdso_linux.go
index 45236157..72b17ce4 100644
--- a/src/runtime/vdso_linux.go
+++ b/src/runtime/vdso_linux.go
@@ -97,6 +97,8 @@ type vdsoInfo struct {
 	verdef *elfVerdef
 }
 
+var vdsoLoadStart, vdsoLoadEnd uintptr
+
 // see vdso_linux_*.go for vdsoSymbolKeys[] and vdso*Sym vars
 
 func vdsoInitFromSysinfoEhdr(info *vdsoInfo, hdr *elfEhdr) {
@@ -116,6 +118,8 @@ func vdsoInitFromSysinfoEhdr(info *vdsoInfo, hdr *elfEhdr) {
 			if !foundVaddr {
 				foundVaddr = true
 				info.loadOffset = info.loadAddr + uintptr(pt.p_offset-pt.p_vaddr)
+				vdsoLoadStart = info.loadOffset
+				vdsoLoadEnd = info.loadOffset + uintptr(pt.p_memsz)
 			}
 
 		case _PT_DYNAMIC:
@@ -285,11 +289,5 @@ func vdsoauxv(tag, val uintptr) {
 //
 //go:nosplit
 func inVDSOPage(pc uintptr) bool {
-	for _, k := range vdsoSymbolKeys {
-		if *k.ptr != 0 {
-			page := *k.ptr &^ (physPageSize - 1)
-			return pc >= page && pc < page+physPageSize
-		}
-	}
-	return false
+	return pc >= vdsoLoadStart && pc < vdsoLoadEnd
 }
diff --git a/src/runtime/vdso_linux_amd64.go b/src/runtime/vdso_linux_amd64.go
index 9c564091..8a89771c 100644
--- a/src/runtime/vdso_linux_amd64.go
+++ b/src/runtime/vdso_linux_amd64.go
@@ -17,11 +17,13 @@ var vdsoLinuxVersion = vdsoVersionKey{"LINUX_2.6", 0x3ae75f6}
 var vdsoSymbolKeys = []vdsoSymbolKey{
 	{"__vdso_gettimeofday", 0x315ca59, 0xb01bca00, &vdsoGettimeofdaySym},
 	{"__vdso_clock_gettime", 0xd35ec75, 0x6e43a318, &vdsoClockgettimeSym},
+	{"__vdso_getrandom", 0x25425d, 0x84a559bf, &vdsoGetrandomSym},
 }
 
 var (
 	vdsoGettimeofdaySym uintptr
 	vdsoClockgettimeSym uintptr
+	vdsoGetrandomSym    uintptr
 )
 
 // vdsoGettimeofdaySym is accessed from the syscall package.
diff --git a/src/runtime/vdso_linux_arm64.go b/src/runtime/vdso_linux_arm64.go
index f5959525..21f875d0 100644
--- a/src/runtime/vdso_linux_arm64.go
+++ b/src/runtime/vdso_linux_arm64.go
@@ -15,7 +15,10 @@ var vdsoLinuxVersion = vdsoVersionKey{"LINUX_2.6.39", 0x75fcb89}
 
 var vdsoSymbolKeys = []vdsoSymbolKey{
 	{"__kernel_clock_gettime", 0xb0cd725, 0xdfa941fd, &vdsoClockgettimeSym},
+	{"__kernel_getrandom", 0x9800c0d, 0x540d4e24, &vdsoGetrandomSym},
 }
 
-// initialize to fall back to syscall
-var vdsoClockgettimeSym uintptr = 0
+var (
+	vdsoClockgettimeSym uintptr
+	vdsoGetrandomSym    uintptr
+)
diff --git a/src/runtime/vdso_linux_loong64.go b/src/runtime/vdso_linux_loong64.go
index e00ef952..37ee02dc 100644
--- a/src/runtime/vdso_linux_loong64.go
+++ b/src/runtime/vdso_linux_loong64.go
@@ -19,9 +19,10 @@ var vdsoLinuxVersion = vdsoVersionKey{"LINUX_5.10", 0xae78f70}
 
 var vdsoSymbolKeys = []vdsoSymbolKey{
 	{"__vdso_clock_gettime", 0xd35ec75, 0x6e43a318, &vdsoClockgettimeSym},
+	{"__vdso_getrandom", 0x25425d, 0x84a559bf, &vdsoGetrandomSym},
 }
 
-// initialize to fall back to syscall
 var (
-	vdsoClockgettimeSym uintptr = 0
+	vdsoClockgettimeSym uintptr
+	vdsoGetrandomSym    uintptr
 )
diff --git a/src/runtime/vdso_linux_ppc64x.go b/src/runtime/vdso_linux_ppc64x.go
index 09c8d9d2..939da7b5 100644
--- a/src/runtime/vdso_linux_ppc64x.go
+++ b/src/runtime/vdso_linux_ppc64x.go
@@ -16,9 +16,10 @@ var vdsoLinuxVersion = vdsoVersionKey{"LINUX_2.6.15", 0x75fcba5}
 
 var vdsoSymbolKeys = []vdsoSymbolKey{
 	{"__kernel_clock_gettime", 0xb0cd725, 0xdfa941fd, &vdsoClockgettimeSym},
+	{"__kernel_getrandom", 0x9800c0d, 0x540d4e24, &vdsoGetrandomSym},
 }
 
-// initialize with vsyscall fallbacks
 var (
-	vdsoClockgettimeSym uintptr = 0
+	vdsoClockgettimeSym uintptr
+	vdsoGetrandomSym    uintptr
 )
diff --git a/src/runtime/vdso_linux_s390x.go b/src/runtime/vdso_linux_s390x.go
index 970ecd3c..113152ff 100644
--- a/src/runtime/vdso_linux_s390x.go
+++ b/src/runtime/vdso_linux_s390x.go
@@ -16,9 +16,10 @@ var vdsoLinuxVersion = vdsoVersionKey{"LINUX_2.6.29", 0x75fcbb9}
 
 var vdsoSymbolKeys = []vdsoSymbolKey{
 	{"__kernel_clock_gettime", 0xb0cd725, 0xdfa941fd, &vdsoClockgettimeSym},
+	{"__kernel_getrandom", 0x9800c0d, 0x540d4e24, &vdsoGetrandomSym},
 }
 
-// initialize with vsyscall fallbacks
 var (
-	vdsoClockgettimeSym uintptr = 0
+	vdsoClockgettimeSym uintptr
+	vdsoGetrandomSym    uintptr
 )
diff --git a/src/runtime/vgetrandom_linux.go b/src/runtime/vgetrandom_linux.go
new file mode 100644
index 00000000..a6ec4b70
--- /dev/null
+++ b/src/runtime/vgetrandom_linux.go
@@ -0,0 +1,112 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build linux && (amd64 || arm64 || arm64be || ppc64 || ppc64le || loong64 || s390x)
+
+package runtime
+
+import (
+	"internal/cpu"
+	"unsafe"
+)
+
+//go:noescape
+func vgetrandom1(buf *byte, length uintptr, flags uint32, state uintptr, stateSize uintptr) int
+
+var vgetrandomAlloc struct {
+	states     []uintptr
+	statesLock mutex
+	stateSize  uintptr
+	mmapProt   int32
+	mmapFlags  int32
+}
+
+func vgetrandomInit() {
+	if vdsoGetrandomSym == 0 {
+		return
+	}
+
+	var params struct {
+		SizeOfOpaqueState uint32
+		MmapProt          uint32
+		MmapFlags         uint32
+		reserved          [13]uint32
+	}
+	if vgetrandom1(nil, 0, 0, uintptr(unsafe.Pointer(¶ms)), ^uintptr(0)) != 0 {
+		return
+	}
+	vgetrandomAlloc.stateSize = uintptr(params.SizeOfOpaqueState)
+	vgetrandomAlloc.mmapProt = int32(params.MmapProt)
+	vgetrandomAlloc.mmapFlags = int32(params.MmapFlags)
+
+	lockInit(&vgetrandomAlloc.statesLock, lockRankLeafRank)
+}
+
+func vgetrandomGetState() uintptr {
+	lock(&vgetrandomAlloc.statesLock)
+	if len(vgetrandomAlloc.states) == 0 {
+		num := uintptr(ncpu) // Just a reasonable size hint to start.
+		stateSizeCacheAligned := (vgetrandomAlloc.stateSize + cpu.CacheLineSize - 1) &^ (cpu.CacheLineSize - 1)
+		allocSize := (num*stateSizeCacheAligned + physPageSize - 1) &^ (physPageSize - 1)
+		num = (physPageSize / stateSizeCacheAligned) * (allocSize / physPageSize)
+		p, err := mmap(nil, allocSize, vgetrandomAlloc.mmapProt, vgetrandomAlloc.mmapFlags, -1, 0)
+		if err != 0 {
+			unlock(&vgetrandomAlloc.statesLock)
+			return 0
+		}
+		newBlock := uintptr(p)
+		if vgetrandomAlloc.states == nil {
+			vgetrandomAlloc.states = make([]uintptr, 0, num)
+		}
+		for i := uintptr(0); i < num; i++ {
+			if (newBlock&(physPageSize-1))+vgetrandomAlloc.stateSize > physPageSize {
+				newBlock = (newBlock + physPageSize - 1) &^ (physPageSize - 1)
+			}
+			vgetrandomAlloc.states = append(vgetrandomAlloc.states, newBlock)
+			newBlock += stateSizeCacheAligned
+		}
+	}
+	state := vgetrandomAlloc.states[len(vgetrandomAlloc.states)-1]
+	vgetrandomAlloc.states = vgetrandomAlloc.states[:len(vgetrandomAlloc.states)-1]
+	unlock(&vgetrandomAlloc.statesLock)
+	return state
+}
+
+func vgetrandomPutState(state uintptr) {
+	lock(&vgetrandomAlloc.statesLock)
+	vgetrandomAlloc.states = append(vgetrandomAlloc.states, state)
+	unlock(&vgetrandomAlloc.statesLock)
+}
+
+// This is exported for use in internal/syscall/unix as well as x/sys/unix.
+//
+//go:linkname vgetrandom
+func vgetrandom(p []byte, flags uint32) (ret int, supported bool) {
+	if vgetrandomAlloc.stateSize == 0 {
+		return -1, false
+	}
+
+	// We use getg().m instead of acquirem() here, because always taking
+	// the lock is slightly more expensive than not always taking the lock.
+	// However, we *do* require that m doesn't migrate elsewhere during the
+	// execution of the vDSO. So, we exploit two details:
+	//   1) Asynchronous preemption is aborted when PC is in the runtime.
+	//   2) Most of the time, this function only calls vgetrandom1(), which
+	//      does not have a preamble that synchronously preempts.
+	// We do need to take the lock when getting a new state for m, but this
+	// is very much the slow path, in the sense that it only ever happens
+	// once over the entire lifetime of an m. So, a simple getg().m suffices.
+	mp := getg().m
+
+	if mp.vgetrandomState == 0 {
+		mp.locks++
+		state := vgetrandomGetState()
+		mp.locks--
+		if state == 0 {
+			return -1, false
+		}
+		mp.vgetrandomState = state
+	}
+	return vgetrandom1(unsafe.SliceData(p), uintptr(len(p)), flags, mp.vgetrandomState, vgetrandomAlloc.stateSize), true
+}
diff --git a/src/runtime/vgetrandom_unsupported.go b/src/runtime/vgetrandom_unsupported.go
new file mode 100644
index 00000000..070392cf
--- /dev/null
+++ b/src/runtime/vgetrandom_unsupported.go
@@ -0,0 +1,18 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build !(linux && (amd64 || arm64 || arm64be || ppc64 || ppc64le || loong64 || s390x))
+
+package runtime
+
+import _ "unsafe"
+
+//go:linkname vgetrandom
+func vgetrandom(p []byte, flags uint32) (ret int, supported bool) {
+	return -1, false
+}
+
+func vgetrandomPutState(state uintptr) {}
+
+func vgetrandomInit() {}
diff --git a/src/slices/example_test.go b/src/slices/example_test.go
index cb601ada..f775b88f 100644
--- a/src/slices/example_test.go
+++ b/src/slices/example_test.go
@@ -310,7 +310,7 @@ func ExampleSortStableFunc() {
 		{"Bob", 24},
 		{"Alice", 55},
 	}
-	// Stable sort by name, keeping age ordering of Alices intact
+	// Stable sort by name, keeping age ordering of Alice intact
 	slices.SortStableFunc(people, func(a, b Person) int {
 		return strings.Compare(a.Name, b.Name)
 	})
@@ -325,9 +325,11 @@ func ExampleClone() {
 	fmt.Println(clone)
 	clone[2] = 10
 	fmt.Println(numbers)
+	fmt.Println(clone)
 	// Output:
 	// [0 42 -10 8]
 	// [0 42 -10 8]
+	// [0 42 10 8]
 }
 
 func ExampleGrow() {
@@ -385,6 +387,133 @@ func ExampleRepeat() {
 	// [0 1 2 3 0 1 2 3]
 }
 
+func ExampleAll() {
+	names := []string{"Alice", "Bob", "Vera"}
+	for i, v := range slices.All(names) {
+		fmt.Println(i, ":", v)
+	}
+	// Output:
+	// 0 : Alice
+	// 1 : Bob
+	// 2 : Vera
+}
+
+func ExampleBackward() {
+	names := []string{"Alice", "Bob", "Vera"}
+	for i, v := range slices.Backward(names) {
+		fmt.Println(i, ":", v)
+	}
+	// Output:
+	// 2 : Vera
+	// 1 : Bob
+	// 0 : Alice
+}
+
+func ExampleValues() {
+	names := []string{"Alice", "Bob", "Vera"}
+	for v := range slices.Values(names) {
+		fmt.Println(v)
+	}
+	// Output:
+	// Alice
+	// Bob
+	// Vera
+}
+
+func ExampleAppendSeq() {
+	seq := func(yield func(int) bool) {
+		for i := 0; i < 10; i += 2 {
+			if !yield(i) {
+				return
+			}
+		}
+	}
+
+	s := slices.AppendSeq([]int{1, 2}, seq)
+	fmt.Println(s)
+	// Output:
+	// [1 2 0 2 4 6 8]
+}
+
+func ExampleCollect() {
+	seq := func(yield func(int) bool) {
+		for i := 0; i < 10; i += 2 {
+			if !yield(i) {
+				return
+			}
+		}
+	}
+
+	s := slices.Collect(seq)
+	fmt.Println(s)
+	// Output:
+	// [0 2 4 6 8]
+}
+
+func ExampleSorted() {
+	seq := func(yield func(int) bool) {
+		flag := -1
+		for i := 0; i < 10; i += 2 {
+			flag = -flag
+			if !yield(i * flag) {
+				return
+			}
+		}
+	}
+
+	s := slices.Sorted(seq)
+	fmt.Println(s)
+	fmt.Println(slices.IsSorted(s))
+	// Output:
+	// [-6 -2 0 4 8]
+	// true
+}
+
+func ExampleSortedFunc() {
+	seq := func(yield func(int) bool) {
+		flag := -1
+		for i := 0; i < 10; i += 2 {
+			flag = -flag
+			if !yield(i * flag) {
+				return
+			}
+		}
+	}
+
+	sortFunc := func(a, b int) int {
+		return cmp.Compare(b, a) // the comparison is being done in reverse
+	}
+
+	s := slices.SortedFunc(seq, sortFunc)
+	fmt.Println(s)
+	// Output:
+	// [8 4 0 -2 -6]
+}
+
+func ExampleSortedStableFunc() {
+	type Person struct {
+		Name string
+		Age  int
+	}
+
+	people := []Person{
+		{"Gopher", 13},
+		{"Alice", 20},
+		{"Bob", 5},
+		{"Vera", 24},
+		{"Zac", 20},
+	}
+
+	sortFunc := func(x, y Person) int {
+		return cmp.Compare(x.Age, y.Age)
+	}
+
+	s := slices.SortedStableFunc(slices.Values(people), sortFunc)
+	fmt.Println(s)
+	// Output:
+	// [{Bob 5} {Gopher 13} {Alice 20} {Zac 20} {Vera 24}]
+}
+
 func ExampleChunk() {
 	type Person struct {
 		Name string
diff --git a/src/slices/slices.go b/src/slices/slices.go
index b3cd4e2c..32029cd8 100644
--- a/src/slices/slices.go
+++ b/src/slices/slices.go
@@ -128,8 +128,8 @@ func ContainsFunc[S ~[]E, E any](s S, f func(E) bool) bool {
 // returning the modified slice.
 // The elements at s[i:] are shifted up to make room.
 // In the returned slice r, r[i] == v[0],
-// and r[i+len(v)] == value originally at r[i].
-// Insert panics if i is out of range.
+// and, if i < len(s), r[i+len(v)] == value originally at r[i].
+// Insert panics if i > len(s).
 // This function is O(len(s) + len(v)).
 func Insert[S ~[]E, E any](s S, i int, v ...E) S {
 	_ = s[i:] // bounds check
@@ -346,8 +346,13 @@ func Replace[S ~[]E, E any](s S, i, j int, v ...E) S {
 // The elements are copied using assignment, so this is a shallow clone.
 // The result may have additional unused capacity.
 func Clone[S ~[]E, E any](s S) S {
-	// The s[:0:0] preserves nil in case it matters.
-	return append(s[:0:0], s...)
+	// Preserve nilness in case it matters.
+	if s == nil {
+		return nil
+	}
+	// Avoid s[:0:0] as it leads to unwanted liveness when cloning a
+	// zero-length slice of a large array; see https://go.dev/issue/68488.
+	return append(S{}, s...)
 }
 
 // Compact replaces consecutive runs of equal elements with a single copy.
@@ -409,6 +414,7 @@ func Grow[S ~[]E, E any](s S, n int) S {
 		panic("cannot be negative")
 	}
 	if n -= cap(s) - len(s); n > 0 {
+		// This expression allocates only once (see test).
 		s = append(s[:cap(s)], make([]E, n)...)[:len(s)]
 	}
 	return s
@@ -434,7 +440,7 @@ func rotateRight[E any](s []E, r int) {
 	rotateLeft(s, len(s)-r)
 }
 
-// overlaps reports whether the memory ranges a[0:len(a)] and b[0:len(b)] overlap.
+// overlaps reports whether the memory ranges a[:len(a)] and b[:len(b)] overlap.
 func overlaps[E any](a, b []E) bool {
 	if len(a) == 0 || len(b) == 0 {
 		return false
@@ -444,7 +450,7 @@ func overlaps[E any](a, b []E) bool {
 		return false
 	}
 	// TODO: use a runtime/unsafe facility once one becomes available. See issue 12445.
-	// Also see crypto/internal/alias/alias.go:AnyOverlap
+	// Also see crypto/internal/fips140/alias/alias.go:AnyOverlap
 	return uintptr(unsafe.Pointer(&a[0])) <= uintptr(unsafe.Pointer(&b[len(b)-1]))+(elemSize-1) &&
 		uintptr(unsafe.Pointer(&b[0])) <= uintptr(unsafe.Pointer(&a[len(a)-1]))+(elemSize-1)
 }
@@ -478,6 +484,9 @@ func Concat[S ~[]E, E any](slices ...S) S {
 			panic("len out of range")
 		}
 	}
+	// Use Grow, not make, to round up to the size class:
+	// the extra space is otherwise unused and helps
+	// callers that append a few elements to the result.
 	newslice := Grow[S](nil, size)
 	for _, s := range slices {
 		newslice = append(newslice, s...)
@@ -496,11 +505,12 @@ func Repeat[S ~[]E, E any](x S, count int) S {
 	}
 
 	const maxInt = ^uint(0) >> 1
-	if hi, lo := bits.Mul(uint(len(x)), uint(count)); hi > 0 || lo > maxInt {
+	hi, lo := bits.Mul(uint(len(x)), uint(count))
+	if hi > 0 || lo > maxInt {
 		panic("the result of (len(x) * count) overflows")
 	}
 
-	newslice := make(S, len(x)*count)
+	newslice := make(S, int(lo)) // lo = len(x) * count
 	n := copy(newslice, x)
 	for n < len(newslice) {
 		n += copy(newslice[n:], newslice[:n])
diff --git a/src/slices/slices_test.go b/src/slices/slices_test.go
index 68c8a3ad..4ced7c07 100644
--- a/src/slices/slices_test.go
+++ b/src/slices/slices_test.go
@@ -6,12 +6,15 @@ package slices_test
 
 import (
 	"cmp"
+	"internal/asan"
+	"internal/msan"
 	"internal/race"
 	"internal/testenv"
 	"math"
 	. "slices"
 	"strings"
 	"testing"
+	"unsafe"
 )
 
 var equalIntTests = []struct {
@@ -496,7 +499,7 @@ func TestInsert(t *testing.T) {
 		}
 	}
 
-	if !testenv.OptimizationOff() && !race.Enabled {
+	if !testenv.OptimizationOff() && !race.Enabled && !asan.Enabled && !msan.Enabled {
 		// Allocations should be amortized.
 		const count = 50
 		n := testing.AllocsPerRun(10, func() {
@@ -952,7 +955,7 @@ func TestGrow(t *testing.T) {
 	}
 	if n := testing.AllocsPerRun(100, func() { _ = Grow(s2, cap(s2)-len(s2)+1) }); n != 1 {
 		errorf := t.Errorf
-		if race.Enabled || testenv.OptimizationOff() {
+		if race.Enabled || msan.Enabled || asan.Enabled || testenv.OptimizationOff() {
 			errorf = t.Logf // this allocates multiple times in race detector mode
 		}
 		errorf("Grow should allocate once when given insufficient capacity; allocated %v times", n)
@@ -1009,7 +1012,7 @@ func TestReverse(t *testing.T) {
 	singleton := []string{"one"}
 	Reverse(singleton)
 	if want := []string{"one"}; !Equal(singleton, want) {
-		t.Errorf("Reverse(singeleton) = %v, want %v", singleton, want)
+		t.Errorf("Reverse(singleton) = %v, want %v", singleton, want)
 	}
 
 	Reverse[[]string](nil)
@@ -1313,7 +1316,7 @@ func TestConcat(t *testing.T) {
 		_ = sink
 		if allocs > 1 {
 			errorf := t.Errorf
-			if testenv.OptimizationOff() || race.Enabled {
+			if testenv.OptimizationOff() || race.Enabled || asan.Enabled || msan.Enabled {
 				errorf = t.Logf
 			}
 			errorf("Concat(%v) allocated %v times; want 1", tc.s, allocs)
@@ -1450,3 +1453,12 @@ func TestRepeatPanics(t *testing.T) {
 		}
 	}
 }
+
+func TestIssue68488(t *testing.T) {
+	s := make([]int, 3)
+	clone := Clone(s[1:1])
+	switch unsafe.SliceData(clone) {
+	case &s[0], &s[1], &s[2]:
+		t.Error("clone keeps alive s due to array overlap")
+	}
+}
diff --git a/src/slices/sort.go b/src/slices/sort.go
index f713ffe0..4f66e7bb 100644
--- a/src/slices/sort.go
+++ b/src/slices/sort.go
@@ -180,8 +180,8 @@ type xorshift uint64
 
 func (r *xorshift) Next() uint64 {
 	*r ^= *r << 13
-	*r ^= *r >> 17
-	*r ^= *r << 5
+	*r ^= *r >> 7
+	*r ^= *r << 17
 	return uint64(*r)
 }
 
diff --git a/src/sort/example_keys_test.go b/src/sort/example_keys_test.go
index 648f919e..5e25f0d3 100644
--- a/src/sort/example_keys_test.go
+++ b/src/sort/example_keys_test.go
@@ -60,7 +60,7 @@ var planets = []Planet{
 	{"Mars", 0.107, 1.5},
 }
 
-// ExampleSortKeys demonstrates a technique for sorting a struct type using programmable sort criteria.
+// Example_sortKeys demonstrates a technique for sorting a struct type using programmable sort criteria.
 func Example_sortKeys() {
 	// Closures that order the Planet structure.
 	name := func(p1, p2 *Planet) bool {
diff --git a/src/sort/example_multi_test.go b/src/sort/example_multi_test.go
index 93f2d3ec..c21050b7 100644
--- a/src/sort/example_multi_test.go
+++ b/src/sort/example_multi_test.go
@@ -87,7 +87,7 @@ var changes = []Change{
 	{"gri", "Smalltalk", 80},
 }
 
-// ExampleMultiKeys demonstrates a technique for sorting a struct type using different
+// Example_sortMultiKeys demonstrates a technique for sorting a struct type using different
 // sets of multiple fields in the comparison. We chain together "Less" functions, each of
 // which compares a single field.
 func Example_sortMultiKeys() {
diff --git a/src/sort/example_search_test.go b/src/sort/example_search_test.go
index eadac9a7..f621dfb4 100644
--- a/src/sort/example_search_test.go
+++ b/src/sort/example_search_test.go
@@ -93,3 +93,20 @@ func ExampleSearchInts() {
 	// found 2 at index 1 in [1 2 3 4 6 7 8]
 	// 5 not found, can be inserted at index 4 in [1 2 3 4 6 7 8]
 }
+
+// This example demonstrates searching for string in a list sorted in ascending order.
+func ExampleSearchStrings() {
+	a := []string{"apple", "banana", "cherry", "date", "fig", "grape"}
+
+	x := "banana"
+	i := sort.SearchStrings(a, x)
+	fmt.Printf("found %s at index %d in %v\n", x, i, a)
+
+	x = "coconut"
+	i = sort.SearchStrings(a, x)
+	fmt.Printf("%s not found, can be inserted at index %d in %v\n", x, i, a)
+
+	// Output:
+	// found banana at index 1 in [apple banana cherry date fig grape]
+	// coconut not found, can be inserted at index 3 in [apple banana cherry date fig grape]
+}
diff --git a/src/sort/example_test.go b/src/sort/example_test.go
index 1f85dbcb..32eb73c8 100644
--- a/src/sort/example_test.go
+++ b/src/sort/example_test.go
@@ -86,6 +86,34 @@ func ExampleSlice() {
 	// By age: [{Gopher 7} {Vera 24} {Alice 55} {Bob 75}]
 }
 
+func ExampleSliceIsSorted() {
+	numbers := []int{1, 2, 3, 4, 5, 6}
+
+	isSortedAsc := sort.SliceIsSorted(numbers, func(i, j int) bool {
+		return numbers[i] < numbers[j]
+	})
+	fmt.Printf("%v sorted ascending: %t\n", numbers, isSortedAsc)
+
+	numbersDesc := []int{6, 5, 4, 3, 2, 1}
+
+	isSortedDesc := sort.SliceIsSorted(numbersDesc, func(i, j int) bool {
+		return numbersDesc[i] > numbersDesc[j]
+	})
+	fmt.Printf("%v sorted descending: %t\n", numbers, isSortedDesc)
+
+	unsortedNumbers := []int{1, 3, 2, 4, 5}
+
+	isSortedUnsorted := sort.SliceIsSorted(unsortedNumbers, func(i, j int) bool {
+		return unsortedNumbers[i] < unsortedNumbers[j]
+	})
+	fmt.Printf("%v unsorted slice sorted: %t\n", unsortedNumbers, isSortedUnsorted)
+
+	// Output:
+	// [1 2 3 4 5 6] sorted ascending: true
+	// [1 2 3 4 5 6] sorted descending: true
+	// [1 3 2 4 5] unsorted slice sorted: false
+}
+
 func ExampleSliceStable() {
 
 	people := []struct {
diff --git a/src/sort/sort.go b/src/sort/sort.go
index 6db161f0..b27ecabd 100644
--- a/src/sort/sort.go
+++ b/src/sort/sort.go
@@ -7,7 +7,10 @@
 // Package sort provides primitives for sorting slices and user-defined collections.
 package sort
 
-import "math/bits"
+import (
+	"math/bits"
+	"slices"
+)
 
 // An implementation of Interface can be sorted by the routines in this package.
 // The methods refer to elements of the underlying collection by integer index.
@@ -64,8 +67,8 @@ type xorshift uint64
 
 func (r *xorshift) Next() uint64 {
 	*r ^= *r << 13
-	*r ^= *r >> 17
-	*r ^= *r << 5
+	*r ^= *r >> 7
+	*r ^= *r << 17
 	return uint64(*r)
 }
 
@@ -162,34 +165,34 @@ func (x StringSlice) Sort() { Sort(x) }
 // Ints sorts a slice of ints in increasing order.
 //
 // Note: as of Go 1.22, this function simply calls [slices.Sort].
-func Ints(x []int) { intsImpl(x) }
+func Ints(x []int) { slices.Sort(x) }
 
 // Float64s sorts a slice of float64s in increasing order.
 // Not-a-number (NaN) values are ordered before other values.
 //
 // Note: as of Go 1.22, this function simply calls [slices.Sort].
-func Float64s(x []float64) { float64sImpl(x) }
+func Float64s(x []float64) { slices.Sort(x) }
 
 // Strings sorts a slice of strings in increasing order.
 //
 // Note: as of Go 1.22, this function simply calls [slices.Sort].
-func Strings(x []string) { stringsImpl(x) }
+func Strings(x []string) { slices.Sort(x) }
 
 // IntsAreSorted reports whether the slice x is sorted in increasing order.
 //
 // Note: as of Go 1.22, this function simply calls [slices.IsSorted].
-func IntsAreSorted(x []int) bool { return intsAreSortedImpl(x) }
+func IntsAreSorted(x []int) bool { return slices.IsSorted(x) }
 
 // Float64sAreSorted reports whether the slice x is sorted in increasing order,
 // with not-a-number (NaN) values before any other values.
 //
 // Note: as of Go 1.22, this function simply calls [slices.IsSorted].
-func Float64sAreSorted(x []float64) bool { return float64sAreSortedImpl(x) }
+func Float64sAreSorted(x []float64) bool { return slices.IsSorted(x) }
 
 // StringsAreSorted reports whether the slice x is sorted in increasing order.
 //
 // Note: as of Go 1.22, this function simply calls [slices.IsSorted].
-func StringsAreSorted(x []string) bool { return stringsAreSortedImpl(x) }
+func StringsAreSorted(x []string) bool { return slices.IsSorted(x) }
 
 // Notes on stable sorting:
 // The used algorithms are simple and provable correct on all input and use
diff --git a/src/sort/sort_impl_120.go b/src/sort/sort_impl_120.go
deleted file mode 100644
index 5980da67..00000000
--- a/src/sort/sort_impl_120.go
+++ /dev/null
@@ -1,15 +0,0 @@
-// Copyright 2023 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-//go:build !go1.21
-
-package sort
-
-func intsImpl(x []int)         { Sort(IntSlice(x)) }
-func float64sImpl(x []float64) { Sort(Float64Slice(x)) }
-func stringsImpl(x []string)   { Sort(StringSlice(x)) }
-
-func intsAreSortedImpl(x []int) bool         { return IsSorted(IntSlice(x)) }
-func float64sAreSortedImpl(x []float64) bool { return IsSorted(Float64Slice(x)) }
-func stringsAreSortedImpl(x []string) bool   { return IsSorted(StringSlice(x)) }
diff --git a/src/sort/sort_impl_go121.go b/src/sort/sort_impl_go121.go
deleted file mode 100644
index 0a6a6a62..00000000
--- a/src/sort/sort_impl_go121.go
+++ /dev/null
@@ -1,22 +0,0 @@
-// Copyright 2023 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-//go:build go1.21
-
-// Starting with Go 1.21, we can leverage the new generic functions from the
-// slices package to implement some `sort` functions faster. However, until
-// the bootstrap compiler uses Go 1.21 or later, we keep a fallback version
-// in sort_impl_120.go that retains the old implementation.
-
-package sort
-
-import "slices"
-
-func intsImpl(x []int)         { slices.Sort(x) }
-func float64sImpl(x []float64) { slices.Sort(x) }
-func stringsImpl(x []string)   { slices.Sort(x) }
-
-func intsAreSortedImpl(x []int) bool         { return slices.IsSorted(x) }
-func float64sAreSortedImpl(x []float64) bool { return slices.IsSorted(x) }
-func stringsAreSortedImpl(x []string) bool   { return slices.IsSorted(x) }
diff --git a/src/strconv/ftoa.go b/src/strconv/ftoa.go
index 22086989..bfe26366 100644
--- a/src/strconv/ftoa.go
+++ b/src/strconv/ftoa.go
@@ -28,14 +28,14 @@ var float64info = floatInfo{52, 11, -1023}
 // value of bitSize bits (32 for float32, 64 for float64).
 //
 // The format fmt is one of
-// 'b' (-ddddp±ddd, a binary exponent),
-// 'e' (-d.dddde±dd, a decimal exponent),
-// 'E' (-d.ddddE±dd, a decimal exponent),
-// 'f' (-ddd.dddd, no exponent),
-// 'g' ('e' for large exponents, 'f' otherwise),
-// 'G' ('E' for large exponents, 'f' otherwise),
-// 'x' (-0xd.ddddp±ddd, a hexadecimal fraction and binary exponent), or
-// 'X' (-0Xd.ddddP±ddd, a hexadecimal fraction and binary exponent).
+//   - 'b' (-ddddp±ddd, a binary exponent),
+//   - 'e' (-d.dddde±dd, a decimal exponent),
+//   - 'E' (-d.ddddE±dd, a decimal exponent),
+//   - 'f' (-ddd.dddd, no exponent),
+//   - 'g' ('e' for large exponents, 'f' otherwise),
+//   - 'G' ('E' for large exponents, 'f' otherwise),
+//   - 'x' (-0xd.ddddp±ddd, a hexadecimal fraction and binary exponent), or
+//   - 'X' (-0Xd.ddddP±ddd, a hexadecimal fraction and binary exponent).
 //
 // The precision prec controls the number of digits (excluding the exponent)
 // printed by the 'e', 'E', 'f', 'g', 'G', 'x', and 'X' formats.
@@ -44,6 +44,8 @@ var float64info = floatInfo{52, 11, -1023}
 // zeros are removed).
 // The special precision -1 uses the smallest number of digits
 // necessary such that ParseFloat will return f exactly.
+// The exponent is written as a decimal integer;
+// for all formats other than 'b', it will be at least two digits.
 func FormatFloat(f float64, fmt byte, prec, bitSize int) string {
 	return string(genericFtoa(make([]byte, 0, max(prec+4, 24)), f, fmt, prec, bitSize))
 }
diff --git a/src/strconv/itoa.go b/src/strconv/itoa.go
index 29fec41f..928b37ff 100644
--- a/src/strconv/itoa.go
+++ b/src/strconv/itoa.go
@@ -152,13 +152,7 @@ func formatBits(dst []byte, u uint64, base int, neg, append_ bool) (d []byte, s
 
 	} else if isPowerOfTwo(base) {
 		// Use shifts and masks instead of / and %.
-		// Base is a power of 2 and 2 <= base <= len(digits) where len(digits) is 36.
-		// The largest power of 2 below or equal to 36 is 32, which is 1 << 5;
-		// i.e., the largest possible shift count is 5. By &-ind that value with
-		// the constant 7 we tell the compiler that the shift count is always
-		// less than 8 which is smaller than any register width. This allows
-		// the compiler to generate better code for the shift operation.
-		shift := uint(bits.TrailingZeros(uint(base))) & 7
+		shift := uint(bits.TrailingZeros(uint(base)))
 		b := uint64(base)
 		m := uint(base) - 1 // == 1<= b {
diff --git a/src/strconv/quote.go b/src/strconv/quote.go
index d626cd08..99c292a8 100644
--- a/src/strconv/quote.go
+++ b/src/strconv/quote.go
@@ -378,7 +378,8 @@ func QuotedPrefix(s string) (string, error) {
 // or backquoted Go string literal, returning the string value
 // that s quotes.  (If s is single-quoted, it would be a Go
 // character literal; Unquote returns the corresponding
-// one-character string.)
+// one-character string. For an empty character literal
+// Unquote returns the empty string.)
 func Unquote(s string) (string, error) {
 	out, rem, err := unquote(s, true)
 	if len(rem) > 0 {
diff --git a/src/strings/builder_test.go b/src/strings/builder_test.go
index 36fd7a77..06cd3e3b 100644
--- a/src/strings/builder_test.go
+++ b/src/strings/builder_test.go
@@ -6,6 +6,7 @@ package strings_test
 
 import (
 	"bytes"
+	"internal/asan"
 	. "strings"
 	"testing"
 	"unicode/utf8"
@@ -89,6 +90,10 @@ func TestBuilderReset(t *testing.T) {
 
 func TestBuilderGrow(t *testing.T) {
 	for _, growLen := range []int{0, 100, 1000, 10000, 100000} {
+		if asan.Enabled {
+			t.Logf("skipping allocs check for growLen %d: extra allocs with -asan; see #70079", growLen)
+			continue
+		}
 		p := bytes.Repeat([]byte{'a'}, growLen)
 		allocs := testing.AllocsPerRun(100, func() {
 			var b Builder
@@ -188,6 +193,9 @@ func TestBuilderWriteByte(t *testing.T) {
 }
 
 func TestBuilderAllocs(t *testing.T) {
+	if asan.Enabled {
+		t.Skip("test allocates more with -asan; see #70079")
+	}
 	// Issue 23382; verify that copyCheck doesn't force the
 	// Builder to escape and be heap allocated.
 	n := testing.AllocsPerRun(10000, func() {
@@ -387,6 +395,9 @@ func BenchmarkBuildString_ByteBuffer(b *testing.B) {
 }
 
 func TestBuilderGrowSizeclasses(t *testing.T) {
+	if asan.Enabled {
+		t.Skip("test allocates more with -asan; see #70079")
+	}
 	s := Repeat("a", 19)
 	allocs := testing.AllocsPerRun(100, func() {
 		var b Builder
diff --git a/src/strings/example_test.go b/src/strings/example_test.go
index bdab7ae8..08efcbf6 100644
--- a/src/strings/example_test.go
+++ b/src/strings/example_test.go
@@ -328,22 +328,22 @@ func ExampleTitle() {
 	// Compare this example to the ToTitle example.
 	fmt.Println(strings.Title("her royal highness"))
 	fmt.Println(strings.Title("loud noises"))
-	fmt.Println(strings.Title("хлеб"))
+	fmt.Println(strings.Title("брат"))
 	// Output:
 	// Her Royal Highness
 	// Loud Noises
-	// Хлеб
+	// Брат
 }
 
 func ExampleToTitle() {
 	// Compare this example to the Title example.
 	fmt.Println(strings.ToTitle("her royal highness"))
 	fmt.Println(strings.ToTitle("loud noises"))
-	fmt.Println(strings.ToTitle("хлеб"))
+	fmt.Println(strings.ToTitle("брат"))
 	// Output:
 	// HER ROYAL HIGHNESS
 	// LOUD NOISES
-	// ХЛЕБ
+	// БРАТ
 }
 
 func ExampleToTitleSpecial() {
@@ -388,8 +388,8 @@ func ExampleToLower() {
 }
 
 func ExampleToLowerSpecial() {
-	fmt.Println(strings.ToLowerSpecial(unicode.TurkishCase, "Önnek İş"))
-	// Output: önnek iş
+	fmt.Println(strings.ToLowerSpecial(unicode.TurkishCase, "Örnek İş"))
+	// Output: örnek iş
 }
 
 func ExampleTrim() {
diff --git a/src/strings/iter.go b/src/strings/iter.go
new file mode 100644
index 00000000..3168e596
--- /dev/null
+++ b/src/strings/iter.go
@@ -0,0 +1,148 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package strings
+
+import (
+	"iter"
+	"unicode"
+	"unicode/utf8"
+)
+
+// Lines returns an iterator over the newline-terminated lines in the string s.
+// The lines yielded by the iterator include their terminating newlines.
+// If s is empty, the iterator yields no lines at all.
+// If s does not end in a newline, the final yielded line will not end in a newline.
+// It returns a single-use iterator.
+func Lines(s string) iter.Seq[string] {
+	return func(yield func(string) bool) {
+		for len(s) > 0 {
+			var line string
+			if i := IndexByte(s, '\n'); i >= 0 {
+				line, s = s[:i+1], s[i+1:]
+			} else {
+				line, s = s, ""
+			}
+			if !yield(line) {
+				return
+			}
+		}
+		return
+	}
+}
+
+// explodeSeq returns an iterator over the runes in s.
+func explodeSeq(s string) iter.Seq[string] {
+	return func(yield func(string) bool) {
+		for len(s) > 0 {
+			_, size := utf8.DecodeRuneInString(s)
+			if !yield(s[:size]) {
+				return
+			}
+			s = s[size:]
+		}
+	}
+}
+
+// splitSeq is SplitSeq or SplitAfterSeq, configured by how many
+// bytes of sep to include in the results (none or all).
+func splitSeq(s, sep string, sepSave int) iter.Seq[string] {
+	if len(sep) == 0 {
+		return explodeSeq(s)
+	}
+	return func(yield func(string) bool) {
+		for {
+			i := Index(s, sep)
+			if i < 0 {
+				break
+			}
+			frag := s[:i+sepSave]
+			if !yield(frag) {
+				return
+			}
+			s = s[i+len(sep):]
+		}
+		yield(s)
+	}
+}
+
+// SplitSeq returns an iterator over all substrings of s separated by sep.
+// The iterator yields the same strings that would be returned by [Split](s, sep),
+// but without constructing the slice.
+// It returns a single-use iterator.
+func SplitSeq(s, sep string) iter.Seq[string] {
+	return splitSeq(s, sep, 0)
+}
+
+// SplitAfterSeq returns an iterator over substrings of s split after each instance of sep.
+// The iterator yields the same strings that would be returned by [SplitAfter](s, sep),
+// but without constructing the slice.
+// It returns a single-use iterator.
+func SplitAfterSeq(s, sep string) iter.Seq[string] {
+	return splitSeq(s, sep, len(sep))
+}
+
+// FieldsSeq returns an iterator over substrings of s split around runs of
+// whitespace characters, as defined by [unicode.IsSpace].
+// The iterator yields the same strings that would be returned by [Fields](s),
+// but without constructing the slice.
+func FieldsSeq(s string) iter.Seq[string] {
+	return func(yield func(string) bool) {
+		start := -1
+		for i := 0; i < len(s); {
+			size := 1
+			r := rune(s[i])
+			isSpace := asciiSpace[s[i]] != 0
+			if r >= utf8.RuneSelf {
+				r, size = utf8.DecodeRuneInString(s[i:])
+				isSpace = unicode.IsSpace(r)
+			}
+			if isSpace {
+				if start >= 0 {
+					if !yield(s[start:i]) {
+						return
+					}
+					start = -1
+				}
+			} else if start < 0 {
+				start = i
+			}
+			i += size
+		}
+		if start >= 0 {
+			yield(s[start:])
+		}
+	}
+}
+
+// FieldsFuncSeq returns an iterator over substrings of s split around runs of
+// Unicode code points satisfying f(c).
+// The iterator yields the same strings that would be returned by [FieldsFunc](s),
+// but without constructing the slice.
+func FieldsFuncSeq(s string, f func(rune) bool) iter.Seq[string] {
+	return func(yield func(string) bool) {
+		start := -1
+		for i := 0; i < len(s); {
+			size := 1
+			r := rune(s[i])
+			if r >= utf8.RuneSelf {
+				r, size = utf8.DecodeRuneInString(s[i:])
+			}
+			if f(r) {
+				if start >= 0 {
+					if !yield(s[start:i]) {
+						return
+					}
+					start = -1
+				}
+			} else if start < 0 {
+				start = i
+			}
+			i += size
+		}
+		if start >= 0 {
+			yield(s[start:])
+		}
+	}
+}
diff --git a/src/strings/search_test.go b/src/strings/search_test.go
index c01a393a..03408504 100644
--- a/src/strings/search_test.go
+++ b/src/strings/search_test.go
@@ -5,7 +5,7 @@
 package strings_test
 
 import (
-	"reflect"
+	"slices"
 	. "strings"
 	"testing"
 )
@@ -83,7 +83,7 @@ func TestFinderCreation(t *testing.T) {
 			}
 		}
 
-		if !reflect.DeepEqual(good, tc.suf) {
+		if !slices.Equal(good, tc.suf) {
 			t.Errorf("boyerMoore(%q) got %v want %v", tc.pattern, good, tc.suf)
 		}
 	}
diff --git a/src/strings/strings.go b/src/strings/strings.go
index 0bd3c1c2..7eb2de63 100644
--- a/src/strings/strings.go
+++ b/src/strings/strings.go
@@ -10,6 +10,7 @@ package strings
 import (
 	"internal/bytealg"
 	"internal/stringslite"
+	"math/bits"
 	"unicode"
 	"unicode/utf8"
 )
@@ -124,6 +125,7 @@ func IndexByte(s string, c byte) int {
 // If r is [utf8.RuneError], it returns the first instance of any
 // invalid UTF-8 byte sequence.
 func IndexRune(s string, r rune) int {
+	const haveFastIndex = bytealg.MaxBruteForce > 0
 	switch {
 	case 0 <= r && r < utf8.RuneSelf:
 		return IndexByte(s, byte(r))
@@ -137,7 +139,60 @@ func IndexRune(s string, r rune) int {
 	case !utf8.ValidRune(r):
 		return -1
 	default:
-		return Index(s, string(r))
+		// Search for rune r using the last byte of its UTF-8 encoded form.
+		// The distribution of the last byte is more uniform compared to the
+		// first byte which has a 78% chance of being [240, 243, 244].
+		rs := string(r)
+		last := len(rs) - 1
+		i := last
+		fails := 0
+		for i < len(s) {
+			if s[i] != rs[last] {
+				o := IndexByte(s[i+1:], rs[last])
+				if o < 0 {
+					return -1
+				}
+				i += o + 1
+			}
+			// Step backwards comparing bytes.
+			for j := 1; j < len(rs); j++ {
+				if s[i-j] != rs[last-j] {
+					goto next
+				}
+			}
+			return i - last
+		next:
+			fails++
+			i++
+			if (haveFastIndex && fails > bytealg.Cutover(i)) && i < len(s) ||
+				(!haveFastIndex && fails >= 4+i>>4 && i < len(s)) {
+				goto fallback
+			}
+		}
+		return -1
+
+	fallback:
+		// see comment in ../bytes/bytes.go
+		if haveFastIndex {
+			if j := bytealg.IndexString(s[i-last:], string(r)); j >= 0 {
+				return i + j - last
+			}
+		} else {
+			c0 := rs[last]
+			c1 := rs[last-1]
+		loop:
+			for ; i < len(s); i++ {
+				if s[i] == c0 && s[i-1] == c1 {
+					for k := 2; k < len(rs); k++ {
+						if s[i-k] != rs[last-k] {
+							continue loop
+						}
+					}
+					return i - last
+				}
+			}
+		}
+		return -1
 	}
 }
 
@@ -568,10 +623,11 @@ func Repeat(s string, count int) string {
 	if count < 0 {
 		panic("strings: negative Repeat count")
 	}
-	if len(s) > maxInt/count {
+	hi, lo := bits.Mul(uint(len(s)), uint(count))
+	if hi > 0 || lo > uint(maxInt) {
 		panic("strings: Repeat output length overflow")
 	}
-	n := len(s) * count
+	n := int(lo) // lo = len(s) * count
 
 	if len(s) == 0 {
 		return ""
@@ -617,13 +673,7 @@ func Repeat(s string, count int) string {
 	b.Grow(n)
 	b.WriteString(s)
 	for b.Len() < n {
-		chunk := n - b.Len()
-		if chunk > b.Len() {
-			chunk = b.Len()
-		}
-		if chunk > chunkMax {
-			chunk = chunkMax
-		}
+		chunk := min(n-b.Len(), b.Len(), chunkMax)
 		b.WriteString(b.String()[:chunk])
 	}
 	return b.String()
diff --git a/src/strings/strings_test.go b/src/strings/strings_test.go
index 4bd3a3c2..80673806 100644
--- a/src/strings/strings_test.go
+++ b/src/strings/strings_test.go
@@ -8,9 +8,10 @@ import (
 	"bytes"
 	"fmt"
 	"io"
+	"iter"
 	"math"
 	"math/rand"
-	"reflect"
+	"slices"
 	"strconv"
 	. "strings"
 	"testing"
@@ -19,16 +20,35 @@ import (
 	"unsafe"
 )
 
-func eq(a, b []string) bool {
-	if len(a) != len(b) {
-		return false
+func collect(t *testing.T, seq iter.Seq[string]) []string {
+	out := slices.Collect(seq)
+	out1 := slices.Collect(seq)
+	if !slices.Equal(out, out1) {
+		t.Fatalf("inconsistent seq:\n%s\n%s", out, out1)
 	}
-	for i := 0; i < len(a); i++ {
-		if a[i] != b[i] {
-			return false
+	return out
+}
+
+type LinesTest struct {
+	a string
+	b []string
+}
+
+var linesTests = []LinesTest{
+	{a: "abc\nabc\n", b: []string{"abc\n", "abc\n"}},
+	{a: "abc\r\nabc", b: []string{"abc\r\n", "abc"}},
+	{a: "abc\r\n", b: []string{"abc\r\n"}},
+	{a: "\nabc", b: []string{"\n", "abc"}},
+	{a: "\nabc\n\n", b: []string{"\n", "abc\n", "\n"}},
+}
+
+func TestLines(t *testing.T) {
+	for _, s := range linesTests {
+		result := slices.Collect(Lines(s.a))
+		if !slices.Equal(result, s.b) {
+			t.Errorf(`slices.Collect(Lines(%q)) = %q; want %q`, s.a, result, s.b)
 		}
 	}
-	return true
 }
 
 var abcd = "abcd"
@@ -135,6 +155,11 @@ var indexTests = []IndexTest{
 	// test fallback to Rabin-Karp.
 	{"oxoxoxoxoxoxoxoxoxoxoxoy", "oy", 22},
 	{"oxoxoxoxoxoxoxoxoxoxoxox", "oy", -1},
+	// test fallback to IndexRune
+	{"oxoxoxoxoxoxoxoxoxoxox☺", "☺", 22},
+	// invalid UTF-8 byte sequence (must be longer than bytealg.MaxBruteForce to
+	// test that we don't use IndexRune)
+	{"xx0123456789012345678901234567890123456789012345678901234567890120123456789012345678901234567890123456xxx\xed\x9f\xc0", "\xed\x9f\xc0", 105},
 }
 
 var lastIndexTests = []IndexTest{
@@ -306,6 +331,37 @@ func TestIndexRune(t *testing.T) {
 		{"a☺b☻c☹d\xe2\x98�\xff�\xed\xa0\x80", -1, -1},
 		{"a☺b☻c☹d\xe2\x98�\xff�\xed\xa0\x80", 0xD800, -1}, // Surrogate pair
 		{"a☺b☻c☹d\xe2\x98�\xff�\xed\xa0\x80", utf8.MaxRune + 1, -1},
+
+		// 2 bytes
+		{"ӆ", 'ӆ', 0},
+		{"a", 'ӆ', -1},
+		{"  ӆ", 'ӆ', 2},
+		{"  a", 'ӆ', -1},
+		{Repeat("ц", 64) + "ӆ", 'ӆ', 128}, // test cutover
+		{Repeat("Ꙁ", 64) + "Ꚁ", '䚀', -1},  // 'Ꚁ' and '䚀' share the same last two bytes
+
+		// 3 bytes
+		{"Ꚁ", 'Ꚁ', 0},
+		{"a", 'Ꚁ', -1},
+		{"  Ꚁ", 'Ꚁ', 2},
+		{"  a", 'Ꚁ', -1},
+		{Repeat("Ꙁ", 64) + "Ꚁ", 'Ꚁ', 192}, // test cutover
+		{Repeat("𡋀", 64) + "𡌀", '𣌀', -1},  // '𡌀' and '𣌀' share the same last two bytes
+
+		// 4 bytes
+		{"𡌀", '𡌀', 0},
+		{"a", '𡌀', -1},
+		{"  𡌀", '𡌀', 2},
+		{"  a", '𡌀', -1},
+		{Repeat("𡋀", 64) + "𡌀", '𡌀', 256}, // test cutover
+		{Repeat("𡋀", 64), '𡌀', -1},
+
+		// Test the cutover to bytealg.IndexString when it is triggered in
+		// the middle of rune that contains consecutive runs of equal bytes.
+		{"aaaaaKKKK\U000bc104", '\U000bc104', 17}, // cutover: (n + 16) / 8
+		{"aaaaaKKKK鄄", '鄄', 17},
+		{"aaKKKKKa\U000bc104", '\U000bc104', 18}, // cutover: 4 + n>>4
+		{"aaKKKKKa鄄", '鄄', 18},
 	}
 	for _, tt := range tests {
 		if got := IndexRune(tt.in, tt.rune); got != tt.want {
@@ -313,13 +369,14 @@ func TestIndexRune(t *testing.T) {
 		}
 	}
 
-	haystack := "test世界"
+	// Make sure we trigger the cutover and string(rune) conversion.
+	haystack := "test" + Repeat("𡋀", 32) + "𡌀"
 	allocs := testing.AllocsPerRun(1000, func() {
 		if i := IndexRune(haystack, 's'); i != 2 {
 			t.Fatalf("'s' at %d; want 2", i)
 		}
-		if i := IndexRune(haystack, '世'); i != 4 {
-			t.Fatalf("'世' at %d; want 4", i)
+		if i := IndexRune(haystack, '𡌀'); i != 132 {
+			t.Fatalf("'𡌀' at %d; want 4", i)
 		}
 	})
 	if allocs != 0 && testing.CoverMode() == "" {
@@ -418,10 +475,16 @@ var splittests = []SplitTest{
 func TestSplit(t *testing.T) {
 	for _, tt := range splittests {
 		a := SplitN(tt.s, tt.sep, tt.n)
-		if !eq(a, tt.a) {
+		if !slices.Equal(a, tt.a) {
 			t.Errorf("Split(%q, %q, %d) = %v; want %v", tt.s, tt.sep, tt.n, a, tt.a)
 			continue
 		}
+		if tt.n < 0 {
+			a2 := slices.Collect(SplitSeq(tt.s, tt.sep))
+			if !slices.Equal(a2, tt.a) {
+				t.Errorf(`collect(SplitSeq(%q, %q)) = %v; want %v`, tt.s, tt.sep, a2, tt.a)
+			}
+		}
 		if tt.n == 0 {
 			continue
 		}
@@ -431,7 +494,7 @@ func TestSplit(t *testing.T) {
 		}
 		if tt.n < 0 {
 			b := Split(tt.s, tt.sep)
-			if !reflect.DeepEqual(a, b) {
+			if !slices.Equal(a, b) {
 				t.Errorf("Split disagrees with SplitN(%q, %q, %d) = %v; want %v", tt.s, tt.sep, tt.n, b, a)
 			}
 		}
@@ -457,17 +520,23 @@ var splitaftertests = []SplitTest{
 func TestSplitAfter(t *testing.T) {
 	for _, tt := range splitaftertests {
 		a := SplitAfterN(tt.s, tt.sep, tt.n)
-		if !eq(a, tt.a) {
+		if !slices.Equal(a, tt.a) {
 			t.Errorf(`Split(%q, %q, %d) = %v; want %v`, tt.s, tt.sep, tt.n, a, tt.a)
 			continue
 		}
+		if tt.n < 0 {
+			a2 := slices.Collect(SplitAfterSeq(tt.s, tt.sep))
+			if !slices.Equal(a2, tt.a) {
+				t.Errorf(`collect(SplitAfterSeq(%q, %q)) = %v; want %v`, tt.s, tt.sep, a2, tt.a)
+			}
+		}
 		s := Join(a, "")
 		if s != tt.s {
 			t.Errorf(`Join(Split(%q, %q, %d), %q) = %q`, tt.s, tt.sep, tt.n, tt.sep, s)
 		}
 		if tt.n < 0 {
 			b := SplitAfter(tt.s, tt.sep)
-			if !reflect.DeepEqual(a, b) {
+			if !slices.Equal(a, b) {
 				t.Errorf("SplitAfter disagrees with SplitAfterN(%q, %q, %d) = %v; want %v", tt.s, tt.sep, tt.n, b, a)
 			}
 		}
@@ -500,10 +569,14 @@ var fieldstests = []FieldsTest{
 func TestFields(t *testing.T) {
 	for _, tt := range fieldstests {
 		a := Fields(tt.s)
-		if !eq(a, tt.a) {
+		if !slices.Equal(a, tt.a) {
 			t.Errorf("Fields(%q) = %v; want %v", tt.s, a, tt.a)
 			continue
 		}
+		a2 := collect(t, FieldsSeq(tt.s))
+		if !slices.Equal(a2, tt.a) {
+			t.Errorf(`collect(FieldsSeq(%q)) = %v; want %v`, tt.s, a2, tt.a)
+		}
 	}
 }
 
@@ -517,7 +590,7 @@ var FieldsFuncTests = []FieldsTest{
 func TestFieldsFunc(t *testing.T) {
 	for _, tt := range fieldstests {
 		a := FieldsFunc(tt.s, unicode.IsSpace)
-		if !eq(a, tt.a) {
+		if !slices.Equal(a, tt.a) {
 			t.Errorf("FieldsFunc(%q, unicode.IsSpace) = %v; want %v", tt.s, a, tt.a)
 			continue
 		}
@@ -525,9 +598,13 @@ func TestFieldsFunc(t *testing.T) {
 	pred := func(c rune) bool { return c == 'X' }
 	for _, tt := range FieldsFuncTests {
 		a := FieldsFunc(tt.s, pred)
-		if !eq(a, tt.a) {
+		if !slices.Equal(a, tt.a) {
 			t.Errorf("FieldsFunc(%q) = %v, want %v", tt.s, a, tt.a)
 		}
+		a2 := collect(t, FieldsFuncSeq(tt.s, pred))
+		if !slices.Equal(a2, tt.a) {
+			t.Errorf(`collect(FieldsFuncSeq(%q)) = %v; want %v`, tt.s, a2, tt.a)
+		}
 	}
 }
 
diff --git a/src/sync/atomic/doc.go b/src/sync/atomic/doc.go
index 7f9d64b7..4e934047 100644
--- a/src/sync/atomic/doc.go
+++ b/src/sync/atomic/doc.go
@@ -60,29 +60,26 @@ import (
 // for 64-bit alignment of 64-bit words accessed atomically via the primitive
 // atomic functions (types [Int64] and [Uint64] are automatically aligned).
 // The first word in an allocated struct, array, or slice; in a global
-// variable; or in a local variable (because the subject of all atomic operations
-// will escape to the heap) can be relied upon to be 64-bit aligned.
+// variable; or in a local variable (because on 32-bit architectures, the
+// subject of 64-bit atomic operations will escape to the heap) can be
+// relied upon to be 64-bit aligned.
 
 // SwapInt32 atomically stores new into *addr and returns the previous *addr value.
 // Consider using the more ergonomic and less error-prone [Int32.Swap] instead.
+//
+//go:noescape
 func SwapInt32(addr *int32, new int32) (old int32)
 
-// SwapInt64 atomically stores new into *addr and returns the previous *addr value.
-// Consider using the more ergonomic and less error-prone [Int64.Swap] instead
-// (particularly if you target 32-bit platforms; see the bugs section).
-func SwapInt64(addr *int64, new int64) (old int64)
-
 // SwapUint32 atomically stores new into *addr and returns the previous *addr value.
 // Consider using the more ergonomic and less error-prone [Uint32.Swap] instead.
+//
+//go:noescape
 func SwapUint32(addr *uint32, new uint32) (old uint32)
 
-// SwapUint64 atomically stores new into *addr and returns the previous *addr value.
-// Consider using the more ergonomic and less error-prone [Uint64.Swap] instead
-// (particularly if you target 32-bit platforms; see the bugs section).
-func SwapUint64(addr *uint64, new uint64) (old uint64)
-
 // SwapUintptr atomically stores new into *addr and returns the previous *addr value.
 // Consider using the more ergonomic and less error-prone [Uintptr.Swap] instead.
+//
+//go:noescape
 func SwapUintptr(addr *uintptr, new uintptr) (old uintptr)
 
 // SwapPointer atomically stores new into *addr and returns the previous *addr value.
@@ -91,24 +88,20 @@ func SwapPointer(addr *unsafe.Pointer, new unsafe.Pointer) (old unsafe.Pointer)
 
 // CompareAndSwapInt32 executes the compare-and-swap operation for an int32 value.
 // Consider using the more ergonomic and less error-prone [Int32.CompareAndSwap] instead.
+//
+//go:noescape
 func CompareAndSwapInt32(addr *int32, old, new int32) (swapped bool)
 
-// CompareAndSwapInt64 executes the compare-and-swap operation for an int64 value.
-// Consider using the more ergonomic and less error-prone [Int64.CompareAndSwap] instead
-// (particularly if you target 32-bit platforms; see the bugs section).
-func CompareAndSwapInt64(addr *int64, old, new int64) (swapped bool)
-
 // CompareAndSwapUint32 executes the compare-and-swap operation for a uint32 value.
 // Consider using the more ergonomic and less error-prone [Uint32.CompareAndSwap] instead.
+//
+//go:noescape
 func CompareAndSwapUint32(addr *uint32, old, new uint32) (swapped bool)
 
-// CompareAndSwapUint64 executes the compare-and-swap operation for a uint64 value.
-// Consider using the more ergonomic and less error-prone [Uint64.CompareAndSwap] instead
-// (particularly if you target 32-bit platforms; see the bugs section).
-func CompareAndSwapUint64(addr *uint64, old, new uint64) (swapped bool)
-
 // CompareAndSwapUintptr executes the compare-and-swap operation for a uintptr value.
 // Consider using the more ergonomic and less error-prone [Uintptr.CompareAndSwap] instead.
+//
+//go:noescape
 func CompareAndSwapUintptr(addr *uintptr, old, new uintptr) (swapped bool)
 
 // CompareAndSwapPointer executes the compare-and-swap operation for a unsafe.Pointer value.
@@ -117,100 +110,82 @@ func CompareAndSwapPointer(addr *unsafe.Pointer, old, new unsafe.Pointer) (swapp
 
 // AddInt32 atomically adds delta to *addr and returns the new value.
 // Consider using the more ergonomic and less error-prone [Int32.Add] instead.
+//
+//go:noescape
 func AddInt32(addr *int32, delta int32) (new int32)
 
 // AddUint32 atomically adds delta to *addr and returns the new value.
 // To subtract a signed positive constant value c from x, do AddUint32(&x, ^uint32(c-1)).
 // In particular, to decrement x, do AddUint32(&x, ^uint32(0)).
 // Consider using the more ergonomic and less error-prone [Uint32.Add] instead.
+//
+//go:noescape
 func AddUint32(addr *uint32, delta uint32) (new uint32)
 
-// AddInt64 atomically adds delta to *addr and returns the new value.
-// Consider using the more ergonomic and less error-prone [Int64.Add] instead
-// (particularly if you target 32-bit platforms; see the bugs section).
-func AddInt64(addr *int64, delta int64) (new int64)
-
-// AddUint64 atomically adds delta to *addr and returns the new value.
-// To subtract a signed positive constant value c from x, do AddUint64(&x, ^uint64(c-1)).
-// In particular, to decrement x, do AddUint64(&x, ^uint64(0)).
-// Consider using the more ergonomic and less error-prone [Uint64.Add] instead
-// (particularly if you target 32-bit platforms; see the bugs section).
-func AddUint64(addr *uint64, delta uint64) (new uint64)
-
 // AddUintptr atomically adds delta to *addr and returns the new value.
 // Consider using the more ergonomic and less error-prone [Uintptr.Add] instead.
+//
+//go:noescape
 func AddUintptr(addr *uintptr, delta uintptr) (new uintptr)
 
 // AndInt32 atomically performs a bitwise AND operation on *addr using the bitmask provided as mask
 // and returns the old value.
 // Consider using the more ergonomic and less error-prone [Int32.And] instead.
+//
+//go:noescape
 func AndInt32(addr *int32, mask int32) (old int32)
 
 // AndUint32 atomically performs a bitwise AND operation on *addr using the bitmask provided as mask
 // and returns the old value.
 // Consider using the more ergonomic and less error-prone [Uint32.And] instead.
+//
+//go:noescape
 func AndUint32(addr *uint32, mask uint32) (old uint32)
 
-// AndInt64 atomically performs a bitwise AND operation on *addr using the bitmask provided as mask
-// and returns the old value.
-// Consider using the more ergonomic and less error-prone [Int64.And] instead.
-func AndInt64(addr *int64, mask int64) (old int64)
-
-// AndUint64 atomically performs a bitwise AND operation on *addr using the bitmask provided as mask
-// and returns the old.
-// Consider using the more ergonomic and less error-prone [Uint64.And] instead.
-func AndUint64(addr *uint64, mask uint64) (old uint64)
-
 // AndUintptr atomically performs a bitwise AND operation on *addr using the bitmask provided as mask
 // and returns the old value.
 // Consider using the more ergonomic and less error-prone [Uintptr.And] instead.
+//
+//go:noescape
 func AndUintptr(addr *uintptr, mask uintptr) (old uintptr)
 
 // OrInt32 atomically performs a bitwise OR operation on *addr using the bitmask provided as mask
 // and returns the old value.
 // Consider using the more ergonomic and less error-prone [Int32.Or] instead.
+//
+//go:noescape
 func OrInt32(addr *int32, mask int32) (old int32)
 
 // OrUint32 atomically performs a bitwise OR operation on *addr using the bitmask provided as mask
 // and returns the old value.
 // Consider using the more ergonomic and less error-prone [Uint32.Or] instead.
+//
+//go:noescape
 func OrUint32(addr *uint32, mask uint32) (old uint32)
 
-// OrInt64 atomically performs a bitwise OR operation on *addr using the bitmask provided as mask
-// and returns the old value.
-// Consider using the more ergonomic and less error-prone [Int64.Or] instead.
-func OrInt64(addr *int64, mask int64) (old int64)
-
-// OrUint64 atomically performs a bitwise OR operation on *addr using the bitmask provided as mask
-// and returns the old value.
-// Consider using the more ergonomic and less error-prone [Uint64.Or] instead.
-func OrUint64(addr *uint64, mask uint64) (old uint64)
-
 // OrUintptr atomically performs a bitwise OR operation on *addr using the bitmask provided as mask
 // and returns the old value.
 // Consider using the more ergonomic and less error-prone [Uintptr.Or] instead.
+//
+//go:noescape
 func OrUintptr(addr *uintptr, mask uintptr) (old uintptr)
 
 // LoadInt32 atomically loads *addr.
 // Consider using the more ergonomic and less error-prone [Int32.Load] instead.
+//
+//go:noescape
 func LoadInt32(addr *int32) (val int32)
 
-// LoadInt64 atomically loads *addr.
-// Consider using the more ergonomic and less error-prone [Int64.Load] instead
-// (particularly if you target 32-bit platforms; see the bugs section).
-func LoadInt64(addr *int64) (val int64)
-
 // LoadUint32 atomically loads *addr.
 // Consider using the more ergonomic and less error-prone [Uint32.Load] instead.
+//
+//go:noescape
 func LoadUint32(addr *uint32) (val uint32)
 
-// LoadUint64 atomically loads *addr.
-// Consider using the more ergonomic and less error-prone [Uint64.Load] instead
-// (particularly if you target 32-bit platforms; see the bugs section).
-func LoadUint64(addr *uint64) (val uint64)
-
 // LoadUintptr atomically loads *addr.
 // Consider using the more ergonomic and less error-prone [Uintptr.Load] instead.
+//
+//go:noescape
 func LoadUintptr(addr *uintptr) (val uintptr)
 
 // LoadPointer atomically loads *addr.
@@ -219,24 +194,20 @@ func LoadPointer(addr *unsafe.Pointer) (val unsafe.Pointer)
 
 // StoreInt32 atomically stores val into *addr.
 // Consider using the more ergonomic and less error-prone [Int32.Store] instead.
+//
+//go:noescape
 func StoreInt32(addr *int32, val int32)
 
-// StoreInt64 atomically stores val into *addr.
-// Consider using the more ergonomic and less error-prone [Int64.Store] instead
-// (particularly if you target 32-bit platforms; see the bugs section).
-func StoreInt64(addr *int64, val int64)
-
 // StoreUint32 atomically stores val into *addr.
 // Consider using the more ergonomic and less error-prone [Uint32.Store] instead.
+//
+//go:noescape
 func StoreUint32(addr *uint32, val uint32)
 
-// StoreUint64 atomically stores val into *addr.
-// Consider using the more ergonomic and less error-prone [Uint64.Store] instead
-// (particularly if you target 32-bit platforms; see the bugs section).
-func StoreUint64(addr *uint64, val uint64)
-
 // StoreUintptr atomically stores val into *addr.
 // Consider using the more ergonomic and less error-prone [Uintptr.Store] instead.
+//
+//go:noescape
 func StoreUintptr(addr *uintptr, val uintptr)
 
 // StorePointer atomically stores val into *addr.
diff --git a/src/sync/atomic/doc_32.go b/src/sync/atomic/doc_32.go
new file mode 100644
index 00000000..9d644f25
--- /dev/null
+++ b/src/sync/atomic/doc_32.go
@@ -0,0 +1,79 @@
+// Copyright 2023 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build 386 || arm || mips || mipsle
+
+package atomic
+
+// SwapInt64 atomically stores new into *addr and returns the previous *addr value.
+// Consider using the more ergonomic and less error-prone [Int64.Swap] instead
+// (particularly if you target 32-bit platforms; see the bugs section).
+func SwapInt64(addr *int64, new int64) (old int64)
+
+// SwapUint64 atomically stores new into *addr and returns the previous *addr value.
+// Consider using the more ergonomic and less error-prone [Uint64.Swap] instead
+// (particularly if you target 32-bit platforms; see the bugs section).
+func SwapUint64(addr *uint64, new uint64) (old uint64)
+
+// CompareAndSwapInt64 executes the compare-and-swap operation for an int64 value.
+// Consider using the more ergonomic and less error-prone [Int64.CompareAndSwap] instead
+// (particularly if you target 32-bit platforms; see the bugs section).
+func CompareAndSwapInt64(addr *int64, old, new int64) (swapped bool)
+
+// CompareAndSwapUint64 executes the compare-and-swap operation for a uint64 value.
+// Consider using the more ergonomic and less error-prone [Uint64.CompareAndSwap] instead
+// (particularly if you target 32-bit platforms; see the bugs section).
+func CompareAndSwapUint64(addr *uint64, old, new uint64) (swapped bool)
+
+// AddInt64 atomically adds delta to *addr and returns the new value.
+// Consider using the more ergonomic and less error-prone [Int64.Add] instead
+// (particularly if you target 32-bit platforms; see the bugs section).
+func AddInt64(addr *int64, delta int64) (new int64)
+
+// AddUint64 atomically adds delta to *addr and returns the new value.
+// To subtract a signed positive constant value c from x, do AddUint64(&x, ^uint64(c-1)).
+// In particular, to decrement x, do AddUint64(&x, ^uint64(0)).
+// Consider using the more ergonomic and less error-prone [Uint64.Add] instead
+// (particularly if you target 32-bit platforms; see the bugs section).
+func AddUint64(addr *uint64, delta uint64) (new uint64)
+
+// AndInt64 atomically performs a bitwise AND operation on *addr using the bitmask provided as mask
+// and returns the old value.
+// Consider using the more ergonomic and less error-prone [Int64.And] instead.
+func AndInt64(addr *int64, mask int64) (old int64)
+
+// AndUint64 atomically performs a bitwise AND operation on *addr using the bitmask provided as mask
+// and returns the old.
+// Consider using the more ergonomic and less error-prone [Uint64.And] instead.
+func AndUint64(addr *uint64, mask uint64) (old uint64)
+
+// OrInt64 atomically performs a bitwise OR operation on *addr using the bitmask provided as mask
+// and returns the old value.
+// Consider using the more ergonomic and less error-prone [Int64.Or] instead.
+func OrInt64(addr *int64, mask int64) (old int64)
+
+// OrUint64 atomically performs a bitwise OR operation on *addr using the bitmask provided as mask
+// and returns the old value.
+// Consider using the more ergonomic and less error-prone [Uint64.Or] instead.
+func OrUint64(addr *uint64, mask uint64) (old uint64)
+
+// LoadInt64 atomically loads *addr.
+// Consider using the more ergonomic and less error-prone [Int64.Load] instead
+// (particularly if you target 32-bit platforms; see the bugs section).
+func LoadInt64(addr *int64) (val int64)
+
+// LoadUint64 atomically loads *addr.
+// Consider using the more ergonomic and less error-prone [Uint64.Load] instead
+// (particularly if you target 32-bit platforms; see the bugs section).
+func LoadUint64(addr *uint64) (val uint64)
+
+// StoreInt64 atomically stores val into *addr.
+// Consider using the more ergonomic and less error-prone [Int64.Store] instead
+// (particularly if you target 32-bit platforms; see the bugs section).
+func StoreInt64(addr *int64, val int64)
+
+// StoreUint64 atomically stores val into *addr.
+// Consider using the more ergonomic and less error-prone [Uint64.Store] instead
+// (particularly if you target 32-bit platforms; see the bugs section).
+func StoreUint64(addr *uint64, val uint64)
diff --git a/src/sync/atomic/doc_64.go b/src/sync/atomic/doc_64.go
new file mode 100644
index 00000000..5fec3f4e
--- /dev/null
+++ b/src/sync/atomic/doc_64.go
@@ -0,0 +1,107 @@
+// Copyright 2023 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build !(386 || arm || mips || mipsle)
+
+package atomic
+
+// SwapInt64 atomically stores new into *addr and returns the previous *addr value.
+// Consider using the more ergonomic and less error-prone [Int64.Swap] instead
+// (particularly if you target 32-bit platforms; see the bugs section).
+//
+//go:noescape
+func SwapInt64(addr *int64, new int64) (old int64)
+
+// SwapUint64 atomically stores new into *addr and returns the previous *addr value.
+// Consider using the more ergonomic and less error-prone [Uint64.Swap] instead
+// (particularly if you target 32-bit platforms; see the bugs section).
+//
+//go:noescape
+func SwapUint64(addr *uint64, new uint64) (old uint64)
+
+// CompareAndSwapInt64 executes the compare-and-swap operation for an int64 value.
+// Consider using the more ergonomic and less error-prone [Int64.CompareAndSwap] instead
+// (particularly if you target 32-bit platforms; see the bugs section).
+//
+//go:noescape
+func CompareAndSwapInt64(addr *int64, old, new int64) (swapped bool)
+
+// CompareAndSwapUint64 executes the compare-and-swap operation for a uint64 value.
+// Consider using the more ergonomic and less error-prone [Uint64.CompareAndSwap] instead
+// (particularly if you target 32-bit platforms; see the bugs section).
+//
+//go:noescape
+func CompareAndSwapUint64(addr *uint64, old, new uint64) (swapped bool)
+
+// AddInt64 atomically adds delta to *addr and returns the new value.
+// Consider using the more ergonomic and less error-prone [Int64.Add] instead
+// (particularly if you target 32-bit platforms; see the bugs section).
+//
+//go:noescape
+func AddInt64(addr *int64, delta int64) (new int64)
+
+// AddUint64 atomically adds delta to *addr and returns the new value.
+// To subtract a signed positive constant value c from x, do AddUint64(&x, ^uint64(c-1)).
+// In particular, to decrement x, do AddUint64(&x, ^uint64(0)).
+// Consider using the more ergonomic and less error-prone [Uint64.Add] instead
+// (particularly if you target 32-bit platforms; see the bugs section).
+//
+//go:noescape
+func AddUint64(addr *uint64, delta uint64) (new uint64)
+
+// AndInt64 atomically performs a bitwise AND operation on *addr using the bitmask provided as mask
+// and returns the old value.
+// Consider using the more ergonomic and less error-prone [Int64.And] instead.
+//
+//go:noescape
+func AndInt64(addr *int64, mask int64) (old int64)
+
+// AndUint64 atomically performs a bitwise AND operation on *addr using the bitmask provided as mask
+// and returns the old.
+// Consider using the more ergonomic and less error-prone [Uint64.And] instead.
+//
+//go:noescape
+func AndUint64(addr *uint64, mask uint64) (old uint64)
+
+// OrInt64 atomically performs a bitwise OR operation on *addr using the bitmask provided as mask
+// and returns the old value.
+// Consider using the more ergonomic and less error-prone [Int64.Or] instead.
+//
+//go:noescape
+func OrInt64(addr *int64, mask int64) (old int64)
+
+// OrUint64 atomically performs a bitwise OR operation on *addr using the bitmask provided as mask
+// and returns the old value.
+// Consider using the more ergonomic and less error-prone [Uint64.Or] instead.
+//
+//go:noescape
+func OrUint64(addr *uint64, mask uint64) (old uint64)
+
+// LoadInt64 atomically loads *addr.
+// Consider using the more ergonomic and less error-prone [Int64.Load] instead
+// (particularly if you target 32-bit platforms; see the bugs section).
+//
+//go:noescape
+func LoadInt64(addr *int64) (val int64)
+
+// LoadUint64 atomically loads *addr.
+// Consider using the more ergonomic and less error-prone [Uint64.Load] instead
+// (particularly if you target 32-bit platforms; see the bugs section).
+//
+//go:noescape
+func LoadUint64(addr *uint64) (val uint64)
+
+// StoreInt64 atomically stores val into *addr.
+// Consider using the more ergonomic and less error-prone [Int64.Store] instead
+// (particularly if you target 32-bit platforms; see the bugs section).
+//
+//go:noescape
+func StoreInt64(addr *int64, val int64)
+
+// StoreUint64 atomically stores val into *addr.
+// Consider using the more ergonomic and less error-prone [Uint64.Store] instead
+// (particularly if you target 32-bit platforms; see the bugs section).
+//
+//go:noescape
+func StoreUint64(addr *uint64, val uint64)
diff --git a/src/sync/hashtriemap.go b/src/sync/hashtriemap.go
new file mode 100644
index 00000000..8df0e2b5
--- /dev/null
+++ b/src/sync/hashtriemap.go
@@ -0,0 +1,116 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build goexperiment.synchashtriemap
+
+package sync
+
+import (
+	isync "internal/sync"
+)
+
+// Map is like a Go map[any]any but is safe for concurrent use
+// by multiple goroutines without additional locking or coordination.
+// Loads, stores, and deletes run in amortized constant time.
+//
+// The Map type is specialized. Most code should use a plain Go map instead,
+// with separate locking or coordination, for better type safety and to make it
+// easier to maintain other invariants along with the map content.
+//
+// The Map type is optimized for two common use cases: (1) when the entry for a given
+// key is only ever written once but read many times, as in caches that only grow,
+// or (2) when multiple goroutines read, write, and overwrite entries for disjoint
+// sets of keys. In these two cases, use of a Map may significantly reduce lock
+// contention compared to a Go map paired with a separate [Mutex] or [RWMutex].
+//
+// The zero Map is empty and ready for use. A Map must not be copied after first use.
+//
+// In the terminology of [the Go memory model], Map arranges that a write operation
+// “synchronizes before” any read operation that observes the effect of the write, where
+// read and write operations are defined as follows.
+// [Map.Load], [Map.LoadAndDelete], [Map.LoadOrStore], [Map.Swap], [Map.CompareAndSwap],
+// and [Map.CompareAndDelete] are read operations;
+// [Map.Delete], [Map.LoadAndDelete], [Map.Store], and [Map.Swap] are write operations;
+// [Map.LoadOrStore] is a write operation when it returns loaded set to false;
+// [Map.CompareAndSwap] is a write operation when it returns swapped set to true;
+// and [Map.CompareAndDelete] is a write operation when it returns deleted set to true.
+//
+// [the Go memory model]: https://go.dev/ref/mem
+type Map struct {
+	_ noCopy
+
+	m isync.HashTrieMap[any, any]
+}
+
+// Load returns the value stored in the map for a key, or nil if no
+// value is present.
+// The ok result indicates whether value was found in the map.
+func (m *Map) Load(key any) (value any, ok bool) {
+	return m.m.Load(key)
+}
+
+// Store sets the value for a key.
+func (m *Map) Store(key, value any) {
+	m.m.Store(key, value)
+}
+
+// Clear deletes all the entries, resulting in an empty Map.
+func (m *Map) Clear() {
+	m.m.Clear()
+}
+
+// LoadOrStore returns the existing value for the key if present.
+// Otherwise, it stores and returns the given value.
+// The loaded result is true if the value was loaded, false if stored.
+func (m *Map) LoadOrStore(key, value any) (actual any, loaded bool) {
+	return m.m.LoadOrStore(key, value)
+}
+
+// LoadAndDelete deletes the value for a key, returning the previous value if any.
+// The loaded result reports whether the key was present.
+func (m *Map) LoadAndDelete(key any) (value any, loaded bool) {
+	return m.m.LoadAndDelete(key)
+}
+
+// Delete deletes the value for a key.
+func (m *Map) Delete(key any) {
+	m.m.Delete(key)
+}
+
+// Swap swaps the value for a key and returns the previous value if any.
+// The loaded result reports whether the key was present.
+func (m *Map) Swap(key, value any) (previous any, loaded bool) {
+	return m.m.Swap(key, value)
+}
+
+// CompareAndSwap swaps the old and new values for key
+// if the value stored in the map is equal to old.
+// The old value must be of a comparable type.
+func (m *Map) CompareAndSwap(key, old, new any) (swapped bool) {
+	return m.m.CompareAndSwap(key, old, new)
+}
+
+// CompareAndDelete deletes the entry for key if its value is equal to old.
+// The old value must be of a comparable type.
+//
+// If there is no current value for key in the map, CompareAndDelete
+// returns false (even if the old value is the nil interface value).
+func (m *Map) CompareAndDelete(key, old any) (deleted bool) {
+	return m.m.CompareAndDelete(key, old)
+}
+
+// Range calls f sequentially for each key and value present in the map.
+// If f returns false, range stops the iteration.
+//
+// Range does not necessarily correspond to any consistent snapshot of the Map's
+// contents: no key will be visited more than once, but if the value for any key
+// is stored or deleted concurrently (including by f), Range may reflect any
+// mapping for that key from any point during the Range call. Range does not
+// block other methods on the receiver; even f itself may call any method on m.
+//
+// Range may be O(N) with the number of elements in the map even if f returns
+// false after a constant number of calls.
+func (m *Map) Range(f func(key, value any) bool) {
+	m.m.Range(f)
+}
diff --git a/src/sync/map.go b/src/sync/map.go
index 33bc8141..25181e0c 100644
--- a/src/sync/map.go
+++ b/src/sync/map.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build !goexperiment.synchashtriemap
+
 package sync
 
 import (
@@ -36,6 +38,8 @@ import (
 //
 // [the Go memory model]: https://go.dev/ref/mem
 type Map struct {
+	_ noCopy
+
 	mu Mutex
 
 	// read contains the portion of the map's contents that are safe for
diff --git a/src/sync/map_bench_test.go b/src/sync/map_bench_test.go
index fb9eb254..f7469aed 100644
--- a/src/sync/map_bench_test.go
+++ b/src/sync/map_bench_test.go
@@ -6,6 +6,7 @@ package sync_test
 
 import (
 	"fmt"
+	isync "internal/sync"
 	"reflect"
 	"sync"
 	"sync/atomic"
@@ -18,13 +19,14 @@ type bench struct {
 }
 
 func benchMap(b *testing.B, bench bench) {
-	for _, m := range [...]mapInterface{&DeepCopyMap{}, &RWMutexMap{}, &sync.Map{}} {
+	for _, m := range [...]mapInterface{&DeepCopyMap{}, &RWMutexMap{}, &isync.HashTrieMap[any, any]{}, &sync.Map{}} {
 		b.Run(fmt.Sprintf("%T", m), func(b *testing.B) {
 			m = reflect.New(reflect.TypeOf(m).Elem()).Interface().(mapInterface)
 			if bench.setup != nil {
 				bench.setup(b, m)
 			}
 
+			b.ReportAllocs()
 			b.ResetTimer()
 
 			var i int64
@@ -36,7 +38,7 @@ func benchMap(b *testing.B, bench bench) {
 	}
 }
 
-func BenchmarkLoadMostlyHits(b *testing.B) {
+func BenchmarkMapLoadMostlyHits(b *testing.B) {
 	const hits, misses = 1023, 1
 
 	benchMap(b, bench{
@@ -58,7 +60,7 @@ func BenchmarkLoadMostlyHits(b *testing.B) {
 	})
 }
 
-func BenchmarkLoadMostlyMisses(b *testing.B) {
+func BenchmarkMapLoadMostlyMisses(b *testing.B) {
 	const hits, misses = 1, 1023
 
 	benchMap(b, bench{
@@ -80,7 +82,7 @@ func BenchmarkLoadMostlyMisses(b *testing.B) {
 	})
 }
 
-func BenchmarkLoadOrStoreBalanced(b *testing.B) {
+func BenchmarkMapLoadOrStoreBalanced(b *testing.B) {
 	const hits, misses = 128, 128
 
 	benchMap(b, bench{
@@ -114,7 +116,7 @@ func BenchmarkLoadOrStoreBalanced(b *testing.B) {
 	})
 }
 
-func BenchmarkLoadOrStoreUnique(b *testing.B) {
+func BenchmarkMapLoadOrStoreUnique(b *testing.B) {
 	benchMap(b, bench{
 		setup: func(b *testing.B, m mapInterface) {
 			if _, ok := m.(*DeepCopyMap); ok {
@@ -130,7 +132,7 @@ func BenchmarkLoadOrStoreUnique(b *testing.B) {
 	})
 }
 
-func BenchmarkLoadOrStoreCollision(b *testing.B) {
+func BenchmarkMapLoadOrStoreCollision(b *testing.B) {
 	benchMap(b, bench{
 		setup: func(_ *testing.B, m mapInterface) {
 			m.LoadOrStore(0, 0)
@@ -144,7 +146,7 @@ func BenchmarkLoadOrStoreCollision(b *testing.B) {
 	})
 }
 
-func BenchmarkLoadAndDeleteBalanced(b *testing.B) {
+func BenchmarkMapLoadAndDeleteBalanced(b *testing.B) {
 	const hits, misses = 128, 128
 
 	benchMap(b, bench{
@@ -174,7 +176,7 @@ func BenchmarkLoadAndDeleteBalanced(b *testing.B) {
 	})
 }
 
-func BenchmarkLoadAndDeleteUnique(b *testing.B) {
+func BenchmarkMapLoadAndDeleteUnique(b *testing.B) {
 	benchMap(b, bench{
 		setup: func(b *testing.B, m mapInterface) {
 			if _, ok := m.(*DeepCopyMap); ok {
@@ -190,7 +192,7 @@ func BenchmarkLoadAndDeleteUnique(b *testing.B) {
 	})
 }
 
-func BenchmarkLoadAndDeleteCollision(b *testing.B) {
+func BenchmarkMapLoadAndDeleteCollision(b *testing.B) {
 	benchMap(b, bench{
 		setup: func(_ *testing.B, m mapInterface) {
 			m.LoadOrStore(0, 0)
@@ -206,7 +208,7 @@ func BenchmarkLoadAndDeleteCollision(b *testing.B) {
 	})
 }
 
-func BenchmarkRange(b *testing.B) {
+func BenchmarkMapRange(b *testing.B) {
 	const mapSize = 1 << 10
 
 	benchMap(b, bench{
@@ -224,12 +226,12 @@ func BenchmarkRange(b *testing.B) {
 	})
 }
 
-// BenchmarkAdversarialAlloc tests performance when we store a new value
+// BenchmarkMapAdversarialAlloc tests performance when we store a new value
 // immediately whenever the map is promoted to clean and otherwise load a
 // unique, missing key.
 //
 // This forces the Load calls to always acquire the map's mutex.
-func BenchmarkAdversarialAlloc(b *testing.B) {
+func BenchmarkMapAdversarialAlloc(b *testing.B) {
 	benchMap(b, bench{
 		perG: func(b *testing.B, pb *testing.PB, i int, m mapInterface) {
 			var stores, loadsSinceStore int64
@@ -245,12 +247,12 @@ func BenchmarkAdversarialAlloc(b *testing.B) {
 	})
 }
 
-// BenchmarkAdversarialDelete tests performance when we periodically delete
+// BenchmarkMapAdversarialDelete tests performance when we periodically delete
 // one key and add a different one in a large map.
 //
 // This forces the Load calls to always acquire the map's mutex and periodically
 // makes a full copy of the map despite changing only one entry.
-func BenchmarkAdversarialDelete(b *testing.B) {
+func BenchmarkMapAdversarialDelete(b *testing.B) {
 	const mapSize = 1 << 10
 
 	benchMap(b, bench{
@@ -276,7 +278,7 @@ func BenchmarkAdversarialDelete(b *testing.B) {
 	})
 }
 
-func BenchmarkDeleteCollision(b *testing.B) {
+func BenchmarkMapDeleteCollision(b *testing.B) {
 	benchMap(b, bench{
 		setup: func(_ *testing.B, m mapInterface) {
 			m.LoadOrStore(0, 0)
@@ -290,7 +292,7 @@ func BenchmarkDeleteCollision(b *testing.B) {
 	})
 }
 
-func BenchmarkSwapCollision(b *testing.B) {
+func BenchmarkMapSwapCollision(b *testing.B) {
 	benchMap(b, bench{
 		setup: func(_ *testing.B, m mapInterface) {
 			m.LoadOrStore(0, 0)
@@ -304,7 +306,7 @@ func BenchmarkSwapCollision(b *testing.B) {
 	})
 }
 
-func BenchmarkSwapMostlyHits(b *testing.B) {
+func BenchmarkMapSwapMostlyHits(b *testing.B) {
 	const hits, misses = 1023, 1
 
 	benchMap(b, bench{
@@ -332,7 +334,7 @@ func BenchmarkSwapMostlyHits(b *testing.B) {
 	})
 }
 
-func BenchmarkSwapMostlyMisses(b *testing.B) {
+func BenchmarkMapSwapMostlyMisses(b *testing.B) {
 	const hits, misses = 1, 1023
 
 	benchMap(b, bench{
@@ -360,7 +362,7 @@ func BenchmarkSwapMostlyMisses(b *testing.B) {
 	})
 }
 
-func BenchmarkCompareAndSwapCollision(b *testing.B) {
+func BenchmarkMapCompareAndSwapCollision(b *testing.B) {
 	benchMap(b, bench{
 		setup: func(_ *testing.B, m mapInterface) {
 			m.LoadOrStore(0, 0)
@@ -376,7 +378,7 @@ func BenchmarkCompareAndSwapCollision(b *testing.B) {
 	})
 }
 
-func BenchmarkCompareAndSwapNoExistingKey(b *testing.B) {
+func BenchmarkMapCompareAndSwapNoExistingKey(b *testing.B) {
 	benchMap(b, bench{
 		perG: func(b *testing.B, pb *testing.PB, i int, m mapInterface) {
 			for ; pb.Next(); i++ {
@@ -388,7 +390,7 @@ func BenchmarkCompareAndSwapNoExistingKey(b *testing.B) {
 	})
 }
 
-func BenchmarkCompareAndSwapValueNotEqual(b *testing.B) {
+func BenchmarkMapCompareAndSwapValueNotEqual(b *testing.B) {
 	benchMap(b, bench{
 		setup: func(_ *testing.B, m mapInterface) {
 			m.Store(0, 0)
@@ -402,7 +404,7 @@ func BenchmarkCompareAndSwapValueNotEqual(b *testing.B) {
 	})
 }
 
-func BenchmarkCompareAndSwapMostlyHits(b *testing.B) {
+func BenchmarkMapCompareAndSwapMostlyHits(b *testing.B) {
 	const hits, misses = 1023, 1
 
 	benchMap(b, bench{
@@ -432,7 +434,7 @@ func BenchmarkCompareAndSwapMostlyHits(b *testing.B) {
 	})
 }
 
-func BenchmarkCompareAndSwapMostlyMisses(b *testing.B) {
+func BenchmarkMapCompareAndSwapMostlyMisses(b *testing.B) {
 	const hits, misses = 1, 1023
 
 	benchMap(b, bench{
@@ -458,7 +460,7 @@ func BenchmarkCompareAndSwapMostlyMisses(b *testing.B) {
 	})
 }
 
-func BenchmarkCompareAndDeleteCollision(b *testing.B) {
+func BenchmarkMapCompareAndDeleteCollision(b *testing.B) {
 	benchMap(b, bench{
 		setup: func(_ *testing.B, m mapInterface) {
 			m.LoadOrStore(0, 0)
@@ -474,7 +476,7 @@ func BenchmarkCompareAndDeleteCollision(b *testing.B) {
 	})
 }
 
-func BenchmarkCompareAndDeleteMostlyHits(b *testing.B) {
+func BenchmarkMapCompareAndDeleteMostlyHits(b *testing.B) {
 	const hits, misses = 1023, 1
 
 	benchMap(b, bench{
@@ -506,7 +508,7 @@ func BenchmarkCompareAndDeleteMostlyHits(b *testing.B) {
 	})
 }
 
-func BenchmarkCompareAndDeleteMostlyMisses(b *testing.B) {
+func BenchmarkMapCompareAndDeleteMostlyMisses(b *testing.B) {
 	const hits, misses = 1, 1023
 
 	benchMap(b, bench{
@@ -534,7 +536,7 @@ func BenchmarkCompareAndDeleteMostlyMisses(b *testing.B) {
 	})
 }
 
-func BenchmarkClear(b *testing.B) {
+func BenchmarkMapClear(b *testing.B) {
 	benchMap(b, bench{
 		perG: func(b *testing.B, pb *testing.PB, i int, m mapInterface) {
 			for ; pb.Next(); i++ {
diff --git a/src/sync/map_reference_test.go b/src/sync/map_reference_test.go
index 283da0f3..f98bb98b 100644
--- a/src/sync/map_reference_test.go
+++ b/src/sync/map_reference_test.go
@@ -5,6 +5,7 @@
 package sync_test
 
 import (
+	isync "internal/sync"
 	"sync"
 	"sync/atomic"
 )
@@ -28,6 +29,7 @@ type mapInterface interface {
 var (
 	_ mapInterface = &RWMutexMap{}
 	_ mapInterface = &DeepCopyMap{}
+	_ mapInterface = &isync.HashTrieMap[any, any]{}
 )
 
 // RWMutexMap is an implementation of mapInterface using a sync.RWMutex.
diff --git a/src/sync/map_test.go b/src/sync/map_test.go
index e1d03807..f12c43a2 100644
--- a/src/sync/map_test.go
+++ b/src/sync/map_test.go
@@ -5,6 +5,7 @@
 package sync_test
 
 import (
+	isync "internal/sync"
 	"internal/testenv"
 	"math/rand"
 	"reflect"
@@ -133,6 +134,10 @@ func applyDeepCopyMap(calls []mapCall) ([]mapResult, map[any]any) {
 	return applyCalls(new(DeepCopyMap), calls)
 }
 
+func applyHashTrieMap(calls []mapCall) ([]mapResult, map[any]any) {
+	return applyCalls(new(isync.HashTrieMap[any, any]), calls)
+}
+
 func TestMapMatchesRWMutex(t *testing.T) {
 	if err := quick.CheckEqual(applyMap, applyRWMutexMap, nil); err != nil {
 		t.Error(err)
@@ -145,6 +150,12 @@ func TestMapMatchesDeepCopy(t *testing.T) {
 	}
 }
 
+func TestMapMatchesHashTrieMap(t *testing.T) {
+	if err := quick.CheckEqual(applyMap, applyHashTrieMap, nil); err != nil {
+		t.Error(err)
+	}
+}
+
 func TestConcurrentRange(t *testing.T) {
 	const mapSize = 1 << 10
 
@@ -347,13 +358,13 @@ func TestConcurrentClear(t *testing.T) {
 	})
 }
 
-func TestMapClearNoAllocations(t *testing.T) {
+func TestMapClearOneAllocation(t *testing.T) {
 	testenv.SkipIfOptimizationOff(t)
 	var m sync.Map
 	allocs := testing.AllocsPerRun(10, func() {
 		m.Clear()
 	})
-	if allocs > 0 {
-		t.Errorf("AllocsPerRun of m.Clear = %v; want 0", allocs)
+	if allocs > 1 {
+		t.Errorf("AllocsPerRun of m.Clear = %v; want 1", allocs)
 	}
 }
diff --git a/src/sync/mutex.go b/src/sync/mutex.go
index e4ed47c7..133c9530 100644
--- a/src/sync/mutex.go
+++ b/src/sync/mutex.go
@@ -11,15 +11,9 @@
 package sync
 
 import (
-	"internal/race"
-	"sync/atomic"
-	"unsafe"
+	isync "internal/sync"
 )
 
-// Provided by runtime via linkname.
-func throw(string)
-func fatal(string)
-
 // A Mutex is a mutual exclusion lock.
 // The zero value for a Mutex is an unlocked mutex.
 //
@@ -34,8 +28,9 @@ func fatal(string)
 //
 // [the Go memory model]: https://go.dev/ref/mem
 type Mutex struct {
-	state int32
-	sema  uint32
+	_ noCopy
+
+	mu isync.Mutex
 }
 
 // A Locker represents an object that can be locked and unlocked.
@@ -44,52 +39,11 @@ type Locker interface {
 	Unlock()
 }
 
-const (
-	mutexLocked = 1 << iota // mutex is locked
-	mutexWoken
-	mutexStarving
-	mutexWaiterShift = iota
-
-	// Mutex fairness.
-	//
-	// Mutex can be in 2 modes of operations: normal and starvation.
-	// In normal mode waiters are queued in FIFO order, but a woken up waiter
-	// does not own the mutex and competes with new arriving goroutines over
-	// the ownership. New arriving goroutines have an advantage -- they are
-	// already running on CPU and there can be lots of them, so a woken up
-	// waiter has good chances of losing. In such case it is queued at front
-	// of the wait queue. If a waiter fails to acquire the mutex for more than 1ms,
-	// it switches mutex to the starvation mode.
-	//
-	// In starvation mode ownership of the mutex is directly handed off from
-	// the unlocking goroutine to the waiter at the front of the queue.
-	// New arriving goroutines don't try to acquire the mutex even if it appears
-	// to be unlocked, and don't try to spin. Instead they queue themselves at
-	// the tail of the wait queue.
-	//
-	// If a waiter receives ownership of the mutex and sees that either
-	// (1) it is the last waiter in the queue, or (2) it waited for less than 1 ms,
-	// it switches mutex back to normal operation mode.
-	//
-	// Normal mode has considerably better performance as a goroutine can acquire
-	// a mutex several times in a row even if there are blocked waiters.
-	// Starvation mode is important to prevent pathological cases of tail latency.
-	starvationThresholdNs = 1e6
-)
-
 // Lock locks m.
 // If the lock is already in use, the calling goroutine
 // blocks until the mutex is available.
 func (m *Mutex) Lock() {
-	// Fast path: grab unlocked mutex.
-	if atomic.CompareAndSwapInt32(&m.state, 0, mutexLocked) {
-		if race.Enabled {
-			race.Acquire(unsafe.Pointer(m))
-		}
-		return
-	}
-	// Slow path (outlined so that the fast path can be inlined)
-	m.lockSlow()
+	m.mu.Lock()
 }
 
 // TryLock tries to lock m and reports whether it succeeded.
@@ -98,111 +52,7 @@ func (m *Mutex) Lock() {
 // and use of TryLock is often a sign of a deeper problem
 // in a particular use of mutexes.
 func (m *Mutex) TryLock() bool {
-	old := m.state
-	if old&(mutexLocked|mutexStarving) != 0 {
-		return false
-	}
-
-	// There may be a goroutine waiting for the mutex, but we are
-	// running now and can try to grab the mutex before that
-	// goroutine wakes up.
-	if !atomic.CompareAndSwapInt32(&m.state, old, old|mutexLocked) {
-		return false
-	}
-
-	if race.Enabled {
-		race.Acquire(unsafe.Pointer(m))
-	}
-	return true
-}
-
-func (m *Mutex) lockSlow() {
-	var waitStartTime int64
-	starving := false
-	awoke := false
-	iter := 0
-	old := m.state
-	for {
-		// Don't spin in starvation mode, ownership is handed off to waiters
-		// so we won't be able to acquire the mutex anyway.
-		if old&(mutexLocked|mutexStarving) == mutexLocked && runtime_canSpin(iter) {
-			// Active spinning makes sense.
-			// Try to set mutexWoken flag to inform Unlock
-			// to not wake other blocked goroutines.
-			if !awoke && old&mutexWoken == 0 && old>>mutexWaiterShift != 0 &&
-				atomic.CompareAndSwapInt32(&m.state, old, old|mutexWoken) {
-				awoke = true
-			}
-			runtime_doSpin()
-			iter++
-			old = m.state
-			continue
-		}
-		new := old
-		// Don't try to acquire starving mutex, new arriving goroutines must queue.
-		if old&mutexStarving == 0 {
-			new |= mutexLocked
-		}
-		if old&(mutexLocked|mutexStarving) != 0 {
-			new += 1 << mutexWaiterShift
-		}
-		// The current goroutine switches mutex to starvation mode.
-		// But if the mutex is currently unlocked, don't do the switch.
-		// Unlock expects that starving mutex has waiters, which will not
-		// be true in this case.
-		if starving && old&mutexLocked != 0 {
-			new |= mutexStarving
-		}
-		if awoke {
-			// The goroutine has been woken from sleep,
-			// so we need to reset the flag in either case.
-			if new&mutexWoken == 0 {
-				throw("sync: inconsistent mutex state")
-			}
-			new &^= mutexWoken
-		}
-		if atomic.CompareAndSwapInt32(&m.state, old, new) {
-			if old&(mutexLocked|mutexStarving) == 0 {
-				break // locked the mutex with CAS
-			}
-			// If we were already waiting before, queue at the front of the queue.
-			queueLifo := waitStartTime != 0
-			if waitStartTime == 0 {
-				waitStartTime = runtime_nanotime()
-			}
-			runtime_SemacquireMutex(&m.sema, queueLifo, 1)
-			starving = starving || runtime_nanotime()-waitStartTime > starvationThresholdNs
-			old = m.state
-			if old&mutexStarving != 0 {
-				// If this goroutine was woken and mutex is in starvation mode,
-				// ownership was handed off to us but mutex is in somewhat
-				// inconsistent state: mutexLocked is not set and we are still
-				// accounted as waiter. Fix that.
-				if old&(mutexLocked|mutexWoken) != 0 || old>>mutexWaiterShift == 0 {
-					throw("sync: inconsistent mutex state")
-				}
-				delta := int32(mutexLocked - 1<>mutexWaiterShift == 1 {
-					// Exit starvation mode.
-					// Critical to do it here and consider wait time.
-					// Starvation mode is so inefficient, that two goroutines
-					// can go lock-step infinitely once they switch mutex
-					// to starvation mode.
-					delta -= mutexStarving
-				}
-				atomic.AddInt32(&m.state, delta)
-				break
-			}
-			awoke = true
-			iter = 0
-		} else {
-			old = m.state
-		}
-	}
-
-	if race.Enabled {
-		race.Acquire(unsafe.Pointer(m))
-	}
+	return m.mu.TryLock()
 }
 
 // Unlock unlocks m.
@@ -212,50 +62,5 @@ func (m *Mutex) lockSlow() {
 // It is allowed for one goroutine to lock a Mutex and then
 // arrange for another goroutine to unlock it.
 func (m *Mutex) Unlock() {
-	if race.Enabled {
-		_ = m.state
-		race.Release(unsafe.Pointer(m))
-	}
-
-	// Fast path: drop lock bit.
-	new := atomic.AddInt32(&m.state, -mutexLocked)
-	if new != 0 {
-		// Outlined slow path to allow inlining the fast path.
-		// To hide unlockSlow during tracing we skip one extra frame when tracing GoUnblock.
-		m.unlockSlow(new)
-	}
-}
-
-func (m *Mutex) unlockSlow(new int32) {
-	if (new+mutexLocked)&mutexLocked == 0 {
-		fatal("sync: unlock of unlocked mutex")
-	}
-	if new&mutexStarving == 0 {
-		old := new
-		for {
-			// If there are no waiters or a goroutine has already
-			// been woken or grabbed the lock, no need to wake anyone.
-			// In starvation mode ownership is directly handed off from unlocking
-			// goroutine to the next waiter. We are not part of this chain,
-			// since we did not observe mutexStarving when we unlocked the mutex above.
-			// So get off the way.
-			if old>>mutexWaiterShift == 0 || old&(mutexLocked|mutexWoken|mutexStarving) != 0 {
-				return
-			}
-			// Grab the right to wake someone.
-			new = (old - 1< 0 {
+		growStack(n - 1)
+	}
+}
+
+func TestWasmExport(t *testing.T) {
+	testExportCalled = false
+	a := int32(123)
+	b := int64(456)
+	want := int64(a) + b
+	if got := testCallExport(a, b); got != want {
+		t.Errorf("got %v, want %v", got, want)
+	}
+	if !testExportCalled {
+		t.Error("testExport not called")
+	}
+}
+
 func TestBool(t *testing.T) {
 	want := true
 	o := dummys.Get("someBool")
@@ -587,16 +632,16 @@ func TestGarbageCollection(t *testing.T) {
 // Note: All JavaScript functions return a JavaScript array, which will cause
 // one allocation to be created to track the Value.gcPtr for the Value finalizer.
 var allocTests = []struct {
-	argLen  int // The number of arguments to use for the syscall
+	argLen   int // The number of arguments to use for the syscall
 	expected int // The expected number of allocations
 }{
-	// For less than or equal to 16 arguments, we expect 1 alloction:
+	// For less than or equal to 16 arguments, we expect 1 allocation:
 	// - makeValue new(ref)
-	{0,  1},
-	{2,  1},
+	{0, 1},
+	{2, 1},
 	{15, 1},
 	{16, 1},
-	// For greater than 16 arguments, we expect 3 alloction:
+	// For greater than 16 arguments, we expect 3 allocation:
 	// - makeValue: new(ref)
 	// - makeArgSlices: argVals = make([]Value, size)
 	// - makeArgSlices: argRefs = make([]ref, size)
@@ -613,7 +658,7 @@ func TestCallAllocations(t *testing.T) {
 		tmpArray := js.Global().Get("Array").New(0)
 		numAllocs := testing.AllocsPerRun(100, func() {
 			tmpArray.Call("concat", args...)
-		});
+		})
 
 		if numAllocs != float64(test.expected) {
 			t.Errorf("got numAllocs %#v, want %#v", numAllocs, test.expected)
@@ -630,7 +675,7 @@ func TestInvokeAllocations(t *testing.T) {
 		concatFunc := tmpArray.Get("concat").Call("bind", tmpArray)
 		numAllocs := testing.AllocsPerRun(100, func() {
 			concatFunc.Invoke(args...)
-		});
+		})
 
 		if numAllocs != float64(test.expected) {
 			t.Errorf("got numAllocs %#v, want %#v", numAllocs, test.expected)
@@ -647,7 +692,7 @@ func TestNewAllocations(t *testing.T) {
 
 		numAllocs := testing.AllocsPerRun(100, func() {
 			arrayConstructor.New(args...)
-		});
+		})
 
 		if numAllocs != float64(test.expected) {
 			t.Errorf("got numAllocs %#v, want %#v", numAllocs, test.expected)
diff --git a/src/syscall/linkname_openbsd.go b/src/syscall/linkname_openbsd.go
index 5f5c517a..bbb56c10 100644
--- a/src/syscall/linkname_openbsd.go
+++ b/src/syscall/linkname_openbsd.go
@@ -12,4 +12,3 @@ import _ "unsafe"
 //go:linkname unlinkat
 //go:linkname openat
 //go:linkname fstatat
-//go:linkname getentropy
diff --git a/src/syscall/mkall.sh b/src/syscall/mkall.sh
index a3bc7676..b9a0ed3d 100755
--- a/src/syscall/mkall.sh
+++ b/src/syscall/mkall.sh
@@ -190,7 +190,7 @@ linux_amd64)
 	mktypes="GOARCH=$GOARCH go tool cgo -godefs"
 	;;
 linux_arm)
-	GOOSARCH_in="syscall_linux_arm.go syscall_linux_accept.go"
+	GOOSARCH_in="syscall_linux_arm.go"
 	mkerrors="$mkerrors"
 	mksyscall="./mksyscall.pl -l32 -arm"
 	mksysnum="curl -s 'http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/plain/arch/arm/include/uapi/asm/unistd.h' | ./mksysnum_linux.pl -"
diff --git a/src/syscall/net_wasip1.go b/src/syscall/net_wasip1.go
index 3918840a..fefd939a 100644
--- a/src/syscall/net_wasip1.go
+++ b/src/syscall/net_wasip1.go
@@ -6,8 +6,6 @@
 
 package syscall
 
-import "unsafe"
-
 const (
 	SHUT_RD   = 0x1
 	SHUT_WR   = 0x2
@@ -18,7 +16,7 @@ type sdflags = uint32
 
 //go:wasmimport wasi_snapshot_preview1 sock_accept
 //go:noescape
-func sock_accept(fd int32, flags fdflags, newfd unsafe.Pointer) Errno
+func sock_accept(fd int32, flags fdflags, newfd *int32) Errno
 
 //go:wasmimport wasi_snapshot_preview1 sock_shutdown
 //go:noescape
@@ -42,7 +40,7 @@ func Listen(fd int, backlog int) error {
 
 func Accept(fd int) (int, Sockaddr, error) {
 	var newfd int32
-	errno := sock_accept(int32(fd), 0, unsafe.Pointer(&newfd))
+	errno := sock_accept(int32(fd), 0, &newfd)
 	return int(newfd), nil, errnoErr(errno)
 }
 
diff --git a/src/syscall/rlimit.go b/src/syscall/rlimit.go
index 8184f17a..3812303f 100644
--- a/src/syscall/rlimit.go
+++ b/src/syscall/rlimit.go
@@ -29,10 +29,18 @@ var origRlimitNofile atomic.Pointer[Rlimit]
 // which Go of course has no choice but to respect.
 func init() {
 	var lim Rlimit
-	if err := Getrlimit(RLIMIT_NOFILE, &lim); err == nil && lim.Cur != lim.Max {
+	if err := Getrlimit(RLIMIT_NOFILE, &lim); err == nil && lim.Max > 0 && lim.Cur < lim.Max-1 {
 		origRlimitNofile.Store(&lim)
 		nlim := lim
-		nlim.Cur = nlim.Max
+
+		// We set Cur to Max - 1 so that we are more likely to
+		// detect cases where another process uses prlimit
+		// to change our resource limits. The theory is that
+		// using prlimit to change to Cur == Max is more likely
+		// than using prlimit to change to Cur == Max - 1.
+		// The place we check for this is in exec_linux.go.
+		nlim.Cur = nlim.Max - 1
+
 		adjustFileLimit(&nlim)
 		setrlimit(RLIMIT_NOFILE, &nlim)
 	}
diff --git a/src/syscall/syscall_aix.go b/src/syscall/syscall_aix.go
index a9bd7a37..36dfd906 100644
--- a/src/syscall/syscall_aix.go
+++ b/src/syscall/syscall_aix.go
@@ -119,11 +119,11 @@ func Getwd() (ret string, err error) {
 		b := make([]byte, len)
 		err := getcwd(&b[0], len)
 		if err == nil {
-			i := 0
-			for b[i] != 0 {
-				i++
+			n := clen(b[:])
+			if n < 1 {
+				return "", EINVAL
 			}
-			return string(b[0:i]), nil
+			return string(b[:n]), nil
 		}
 		if err != ERANGE {
 			return "", err
diff --git a/src/syscall/syscall_freebsd_386.go b/src/syscall/syscall_freebsd_386.go
index 60359e38..a217dc75 100644
--- a/src/syscall/syscall_freebsd_386.go
+++ b/src/syscall/syscall_freebsd_386.go
@@ -36,7 +36,13 @@ func sendfile(outfd int, infd int, offset *int64, count int) (written int, err e
 	var writtenOut uint64 = 0
 	_, _, e1 := Syscall9(SYS_SENDFILE, uintptr(infd), uintptr(outfd), uintptr(*offset), uintptr((*offset)>>32), uintptr(count), 0, uintptr(unsafe.Pointer(&writtenOut)), 0, 0)
 
-	written = int(writtenOut)
+	// For some reason on the freebsd-386 builder writtenOut
+	// is modified when the system call returns EINVAL.
+	// The man page says that the value is only written for
+	// success, EINTR, or EAGAIN, so only use those cases.
+	if e1 == 0 || e1 == EINTR || e1 == EAGAIN {
+		written = int(writtenOut)
+	}
 
 	if e1 != 0 {
 		err = e1
diff --git a/src/syscall/syscall_js.go b/src/syscall/syscall_js.go
index 0e529e03..c320e34f 100644
--- a/src/syscall/syscall_js.go
+++ b/src/syscall/syscall_js.go
@@ -128,12 +128,13 @@ const (
 	O_WRONLY = 1
 	O_RDWR   = 2
 
-	O_CREAT  = 0100
-	O_CREATE = O_CREAT
-	O_TRUNC  = 01000
-	O_APPEND = 02000
-	O_EXCL   = 0200
-	O_SYNC   = 010000
+	O_CREAT     = 0100
+	O_CREATE    = O_CREAT
+	O_TRUNC     = 01000
+	O_APPEND    = 02000
+	O_EXCL      = 0200
+	O_SYNC      = 010000
+	O_DIRECTORY = 020000
 
 	O_CLOEXEC = 0
 )
diff --git a/src/syscall/syscall_linux.go b/src/syscall/syscall_linux.go
index 27069735..003f7a53 100644
--- a/src/syscall/syscall_linux.go
+++ b/src/syscall/syscall_linux.go
@@ -682,6 +682,10 @@ func anyToSockaddr(rsa *RawSockaddrAny) (Sockaddr, error) {
 	return nil, EAFNOSUPPORT
 }
 
+func Accept(fd int) (nfd int, sa Sockaddr, err error) {
+	return Accept4(fd, 0)
+}
+
 func Accept4(fd int, flags int) (nfd int, sa Sockaddr, err error) {
 	var rsa RawSockaddrAny
 	var len _Socklen = SizeofSockaddrAny
@@ -1284,6 +1288,17 @@ func Munmap(b []byte) (err error) {
 //sys	Mlockall(flags int) (err error)
 //sys	Munlockall() (err error)
 
+func Getrlimit(resource int, rlim *Rlimit) (err error) {
+	// prlimit1 is the same as prlimit when newlimit == nil
+	return prlimit1(0, resource, nil, rlim)
+}
+
+// setrlimit sets a resource limit.
+// The Setrlimit function is in rlimit.go, and calls this one.
+func setrlimit(resource int, rlim *Rlimit) (err error) {
+	return prlimit1(0, resource, rlim, nil)
+}
+
 // prlimit changes a resource limit. We use a single definition so that
 // we can tell StartProcess to not restore the original NOFILE limit.
 //
diff --git a/src/syscall/syscall_linux_386.go b/src/syscall/syscall_linux_386.go
index a559f7e2..a90565a0 100644
--- a/src/syscall/syscall_linux_386.go
+++ b/src/syscall/syscall_linux_386.go
@@ -72,96 +72,6 @@ func mmap(addr uintptr, length uintptr, prot int, flags int, fd int, offset int6
 	return mmap2(addr, length, prot, flags, fd, page)
 }
 
-type rlimit32 struct {
-	Cur uint32
-	Max uint32
-}
-
-//sysnb getrlimit(resource int, rlim *rlimit32) (err error) = SYS_GETRLIMIT
-
-const rlimInf32 = ^uint32(0)
-const rlimInf64 = ^uint64(0)
-
-func Getrlimit(resource int, rlim *Rlimit) (err error) {
-	err = prlimit(0, resource, nil, rlim)
-	if err != ENOSYS {
-		return err
-	}
-
-	rl := rlimit32{}
-	err = getrlimit(resource, &rl)
-	if err != nil {
-		return
-	}
-
-	if rl.Cur == rlimInf32 {
-		rlim.Cur = rlimInf64
-	} else {
-		rlim.Cur = uint64(rl.Cur)
-	}
-
-	if rl.Max == rlimInf32 {
-		rlim.Max = rlimInf64
-	} else {
-		rlim.Max = uint64(rl.Max)
-	}
-	return
-}
-
-//sysnb setrlimit1(resource int, rlim *rlimit32) (err error) = SYS_SETRLIMIT
-
-func setrlimit(resource int, rlim *Rlimit) (err error) {
-	err = prlimit(0, resource, rlim, nil)
-	if err != ENOSYS {
-		return err
-	}
-
-	rl := rlimit32{}
-	if rlim.Cur == rlimInf64 {
-		rl.Cur = rlimInf32
-	} else if rlim.Cur < uint64(rlimInf32) {
-		rl.Cur = uint32(rlim.Cur)
-	} else {
-		return EINVAL
-	}
-	if rlim.Max == rlimInf64 {
-		rl.Max = rlimInf32
-	} else if rlim.Max < uint64(rlimInf32) {
-		rl.Max = uint32(rlim.Max)
-	} else {
-		return EINVAL
-	}
-
-	return setrlimit1(resource, &rl)
-}
-
-//go:nosplit
-func rawSetrlimit(resource int, rlim *Rlimit) Errno {
-	_, _, errno := RawSyscall6(SYS_PRLIMIT64, 0, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0, 0, 0)
-	if errno != ENOSYS {
-		return errno
-	}
-
-	rl := rlimit32{}
-	if rlim.Cur == rlimInf64 {
-		rl.Cur = rlimInf32
-	} else if rlim.Cur < uint64(rlimInf32) {
-		rl.Cur = uint32(rlim.Cur)
-	} else {
-		return EINVAL
-	}
-	if rlim.Max == rlimInf64 {
-		rl.Max = rlimInf32
-	} else if rlim.Max < uint64(rlimInf32) {
-		rl.Max = uint32(rlim.Max)
-	} else {
-		return EINVAL
-	}
-
-	_, _, errno = RawSyscall(SYS_SETRLIMIT, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0)
-	return errno
-}
-
 // Underlying system call writes to newoffset via pointer.
 // Implemented in assembly to avoid allocation.
 func seek(fd int, offset int64, whence int) (newoffset int64, err Errno)
diff --git a/src/syscall/syscall_linux_accept.go b/src/syscall/syscall_linux_accept.go
deleted file mode 100644
index 66c0f84c..00000000
--- a/src/syscall/syscall_linux_accept.go
+++ /dev/null
@@ -1,34 +0,0 @@
-// Copyright 2009 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// We require Linux kernel version 2.6.32. The accept4 system call was
-// added in version 2.6.28, so in general we can use accept4.
-// Unfortunately, for ARM only, accept4 was added in version 2.6.36.
-// Handle that case here, by using a copy of the Accept function that
-// we used in Go 1.17.
-
-//go:build linux && arm
-
-package syscall
-
-//sys	accept(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (fd int, err error)
-
-func Accept(fd int) (nfd int, sa Sockaddr, err error) {
-	var rsa RawSockaddrAny
-	var len _Socklen = SizeofSockaddrAny
-	// Try accept4 first for Android and newer kernels.
-	nfd, err = accept4(fd, &rsa, &len, 0)
-	if err == ENOSYS {
-		nfd, err = accept(fd, &rsa, &len)
-	}
-	if err != nil {
-		return
-	}
-	sa, err = anyToSockaddr(&rsa)
-	if err != nil {
-		Close(nfd)
-		nfd = 0
-	}
-	return
-}
diff --git a/src/syscall/syscall_linux_accept4.go b/src/syscall/syscall_linux_accept4.go
deleted file mode 100644
index 74898672..00000000
--- a/src/syscall/syscall_linux_accept4.go
+++ /dev/null
@@ -1,25 +0,0 @@
-// Copyright 2009 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// This file provides the Accept function used on all systems
-// other than arm. See syscall_linux_accept.go for why.
-
-//go:build linux && !arm
-
-package syscall
-
-func Accept(fd int) (nfd int, sa Sockaddr, err error) {
-	var rsa RawSockaddrAny
-	var len _Socklen = SizeofSockaddrAny
-	nfd, err = accept4(fd, &rsa, &len, 0)
-	if err != nil {
-		return
-	}
-	sa, err = anyToSockaddr(&rsa)
-	if err != nil {
-		Close(nfd)
-		nfd = 0
-	}
-	return
-}
diff --git a/src/syscall/syscall_linux_amd64.go b/src/syscall/syscall_linux_amd64.go
index ec52f8a4..725ebdba 100644
--- a/src/syscall/syscall_linux_amd64.go
+++ b/src/syscall/syscall_linux_amd64.go
@@ -4,10 +4,6 @@
 
 package syscall
 
-import (
-	"unsafe"
-)
-
 const (
 	_SYS_setgroups  = SYS_SETGROUPS
 	_SYS_clone3     = 435
@@ -23,7 +19,6 @@ const (
 //sysnb	Getegid() (egid int)
 //sysnb	Geteuid() (euid int)
 //sysnb	Getgid() (gid int)
-//sysnb	Getrlimit(resource int, rlim *Rlimit) (err error)
 //sysnb	Getuid() (uid int)
 //sysnb	InotifyInit() (fd int, err error)
 //sys	Ioperm(from int, num int, on int) (err error)
@@ -38,7 +33,6 @@ const (
 //sys	sendfile(outfd int, infd int, offset *int64, count int) (written int, err error)
 //sys	Setfsgid(gid int) (err error)
 //sys	Setfsuid(uid int) (err error)
-//sysnb	setrlimit(resource int, rlim *Rlimit) (err error) = SYS_SETRLIMIT
 //sys	Shutdown(fd int, how int) (err error)
 //sys	Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int64, err error)
 //sys	Statfs(path string, buf *Statfs_t) (err error)
@@ -103,12 +97,6 @@ func Time(t *Time_t) (tt Time_t, err error) {
 //sys	Utime(path string, buf *Utimbuf) (err error)
 //sys	utimes(path string, times *[2]Timeval) (err error)
 
-//go:nosplit
-func rawSetrlimit(resource int, rlim *Rlimit) Errno {
-	_, _, errno := RawSyscall(SYS_SETRLIMIT, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0)
-	return errno
-}
-
 func setTimespec(sec, nsec int64) Timespec {
 	return Timespec{Sec: sec, Nsec: nsec}
 }
diff --git a/src/syscall/syscall_linux_arm.go b/src/syscall/syscall_linux_arm.go
index a6d92cea..2019b151 100644
--- a/src/syscall/syscall_linux_arm.go
+++ b/src/syscall/syscall_linux_arm.go
@@ -124,96 +124,6 @@ func mmap(addr uintptr, length uintptr, prot int, flags int, fd int, offset int6
 	return mmap2(addr, length, prot, flags, fd, page)
 }
 
-type rlimit32 struct {
-	Cur uint32
-	Max uint32
-}
-
-//sysnb getrlimit(resource int, rlim *rlimit32) (err error) = SYS_GETRLIMIT
-
-const rlimInf32 = ^uint32(0)
-const rlimInf64 = ^uint64(0)
-
-func Getrlimit(resource int, rlim *Rlimit) (err error) {
-	err = prlimit(0, resource, nil, rlim)
-	if err != ENOSYS {
-		return err
-	}
-
-	rl := rlimit32{}
-	err = getrlimit(resource, &rl)
-	if err != nil {
-		return
-	}
-
-	if rl.Cur == rlimInf32 {
-		rlim.Cur = rlimInf64
-	} else {
-		rlim.Cur = uint64(rl.Cur)
-	}
-
-	if rl.Max == rlimInf32 {
-		rlim.Max = rlimInf64
-	} else {
-		rlim.Max = uint64(rl.Max)
-	}
-	return
-}
-
-//sysnb setrlimit1(resource int, rlim *rlimit32) (err error) = SYS_SETRLIMIT
-
-func setrlimit(resource int, rlim *Rlimit) (err error) {
-	err = prlimit(0, resource, rlim, nil)
-	if err != ENOSYS {
-		return err
-	}
-
-	rl := rlimit32{}
-	if rlim.Cur == rlimInf64 {
-		rl.Cur = rlimInf32
-	} else if rlim.Cur < uint64(rlimInf32) {
-		rl.Cur = uint32(rlim.Cur)
-	} else {
-		return EINVAL
-	}
-	if rlim.Max == rlimInf64 {
-		rl.Max = rlimInf32
-	} else if rlim.Max < uint64(rlimInf32) {
-		rl.Max = uint32(rlim.Max)
-	} else {
-		return EINVAL
-	}
-
-	return setrlimit1(resource, &rl)
-}
-
-//go:nosplit
-func rawSetrlimit(resource int, rlim *Rlimit) Errno {
-	_, _, errno := RawSyscall6(SYS_PRLIMIT64, 0, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0, 0, 0)
-	if errno != ENOSYS {
-		return errno
-	}
-
-	rl := rlimit32{}
-	if rlim.Cur == rlimInf64 {
-		rl.Cur = rlimInf32
-	} else if rlim.Cur < uint64(rlimInf32) {
-		rl.Cur = uint32(rlim.Cur)
-	} else {
-		return EINVAL
-	}
-	if rlim.Max == rlimInf64 {
-		rl.Max = rlimInf32
-	} else if rlim.Max < uint64(rlimInf32) {
-		rl.Max = uint32(rlim.Max)
-	} else {
-		return EINVAL
-	}
-
-	_, _, errno = RawSyscall(SYS_SETRLIMIT, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0)
-	return errno
-}
-
 func (r *PtraceRegs) PC() uint64 { return uint64(r.Uregs[15]) }
 
 func (r *PtraceRegs) SetPC(pc uint64) { r.Uregs[15] = uint32(pc) }
diff --git a/src/syscall/syscall_linux_arm64.go b/src/syscall/syscall_linux_arm64.go
index b87b51c0..fb0ecd77 100644
--- a/src/syscall/syscall_linux_arm64.go
+++ b/src/syscall/syscall_linux_arm64.go
@@ -27,7 +27,6 @@ func Fstatat(fd int, path string, stat *Stat_t, flags int) error {
 //sysnb	Getegid() (egid int)
 //sysnb	Geteuid() (euid int)
 //sysnb	Getgid() (gid int)
-//sysnb	getrlimit(resource int, rlim *Rlimit) (err error)
 //sysnb	Getuid() (uid int)
 //sys	Listen(s int, n int) (err error)
 //sys	pread(fd int, p []byte, offset int64) (n int, err error) = SYS_PREAD64
@@ -37,7 +36,6 @@ func Fstatat(fd int, path string, stat *Stat_t, flags int) error {
 //sys	sendfile(outfd int, infd int, offset *int64, count int) (written int, err error)
 //sys	Setfsgid(gid int) (err error)
 //sys	Setfsuid(uid int) (err error)
-//sysnb	setrlimit1(resource int, rlim *Rlimit) (err error) = SYS_SETRLIMIT
 //sys	Shutdown(fd int, how int) (err error)
 //sys	Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int64, err error)
 
@@ -140,34 +138,6 @@ func utimes(path string, tv *[2]Timeval) (err error) {
 	return utimensat(_AT_FDCWD, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), 0)
 }
 
-// Getrlimit prefers the prlimit64 system call. See issue 38604.
-func Getrlimit(resource int, rlim *Rlimit) error {
-	err := prlimit(0, resource, nil, rlim)
-	if err != ENOSYS {
-		return err
-	}
-	return getrlimit(resource, rlim)
-}
-
-// setrlimit prefers the prlimit64 system call. See issue 38604.
-func setrlimit(resource int, rlim *Rlimit) error {
-	err := prlimit(0, resource, rlim, nil)
-	if err != ENOSYS {
-		return err
-	}
-	return setrlimit1(resource, rlim)
-}
-
-//go:nosplit
-func rawSetrlimit(resource int, rlim *Rlimit) Errno {
-	_, _, errno := RawSyscall6(SYS_PRLIMIT64, 0, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0, 0, 0)
-	if errno != ENOSYS {
-		return errno
-	}
-	_, _, errno = RawSyscall(SYS_SETRLIMIT, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0)
-	return errno
-}
-
 func (r *PtraceRegs) PC() uint64 { return r.Pc }
 
 func (r *PtraceRegs) SetPC(pc uint64) { r.Pc = pc }
diff --git a/src/syscall/syscall_linux_loong64.go b/src/syscall/syscall_linux_loong64.go
index 634cf30c..360590d2 100644
--- a/src/syscall/syscall_linux_loong64.go
+++ b/src/syscall/syscall_linux_loong64.go
@@ -183,22 +183,6 @@ func utimes(path string, tv *[2]Timeval) (err error) {
 	return utimensat(_AT_FDCWD, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), 0)
 }
 
-// Getrlimit prefers the prlimit64 system call.
-func Getrlimit(resource int, rlim *Rlimit) error {
-	return prlimit(0, resource, nil, rlim)
-}
-
-// setrlimit prefers the prlimit64 system call.
-func setrlimit(resource int, rlim *Rlimit) error {
-	return prlimit(0, resource, rlim, nil)
-}
-
-//go:nosplit
-func rawSetrlimit(resource int, rlim *Rlimit) Errno {
-	_, _, errno := RawSyscall6(SYS_PRLIMIT64, 0, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0, 0, 0)
-	return errno
-}
-
 func (r *PtraceRegs) GetEra() uint64 { return r.Era }
 
 func (r *PtraceRegs) SetEra(era uint64) { r.Era = era }
diff --git a/src/syscall/syscall_linux_mips64x.go b/src/syscall/syscall_linux_mips64x.go
index 41106ed8..e826e086 100644
--- a/src/syscall/syscall_linux_mips64x.go
+++ b/src/syscall/syscall_linux_mips64x.go
@@ -6,10 +6,6 @@
 
 package syscall
 
-import (
-	"unsafe"
-)
-
 const (
 	_SYS_setgroups  = SYS_SETGROUPS
 	_SYS_clone3     = 5435
@@ -20,12 +16,10 @@ const (
 //sys	Dup2(oldfd int, newfd int) (err error)
 //sys	Fchown(fd int, uid int, gid int) (err error)
 //sys	Fstatfs(fd int, buf *Statfs_t) (err error)
-//sys	fstatat(dirfd int, path string, stat *Stat_t, flags int) (err error) = SYS_NEWFSTATAT
 //sys	Ftruncate(fd int, length int64) (err error)
 //sysnb	Getegid() (egid int)
 //sysnb	Geteuid() (euid int)
 //sysnb	Getgid() (gid int)
-//sysnb	Getrlimit(resource int, rlim *Rlimit) (err error)
 //sysnb	Getuid() (uid int)
 //sysnb	InotifyInit() (fd int, err error)
 //sys	Lchown(path string, uid int, gid int) (err error)
@@ -38,7 +32,6 @@ const (
 //sys	sendfile(outfd int, infd int, offset *int64, count int) (written int, err error)
 //sys	Setfsgid(gid int) (err error)
 //sys	Setfsuid(uid int) (err error)
-//sysnb	setrlimit(resource int, rlim *Rlimit) (err error) = SYS_SETRLIMIT
 //sys	Shutdown(fd int, how int) (err error)
 //sys	Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int64, err error)
 //sys	Statfs(path string, buf *Statfs_t) (err error)
@@ -94,12 +87,6 @@ func Time(t *Time_t) (tt Time_t, err error) {
 //sys	Utime(path string, buf *Utimbuf) (err error)
 //sys	utimes(path string, times *[2]Timeval) (err error)
 
-//go:nosplit
-func rawSetrlimit(resource int, rlim *Rlimit) Errno {
-	_, _, errno := RawSyscall(SYS_SETRLIMIT, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0)
-	return errno
-}
-
 func setTimespec(sec, nsec int64) Timespec {
 	return Timespec{Sec: sec, Nsec: nsec}
 }
@@ -138,10 +125,22 @@ type stat_t struct {
 	Blocks     int64
 }
 
+//sys	fstatatInternal(dirfd int, path string, stat *stat_t, flags int) (err error) = SYS_NEWFSTATAT
 //sys	fstat(fd int, st *stat_t) (err error)
 //sys	lstat(path string, st *stat_t) (err error)
 //sys	stat(path string, st *stat_t) (err error)
 
+func fstatat(fd int, path string, s *Stat_t, flags int) (err error) {
+	st := &stat_t{}
+	err = fstatatInternal(fd, path, st, flags)
+	fillStat_t(s, st)
+	return
+}
+
+func Fstatat(fd int, path string, s *Stat_t, flags int) (err error) {
+	return fstatat(fd, path, s, flags)
+}
+
 func Fstat(fd int, s *Stat_t) (err error) {
 	st := &stat_t{}
 	err = fstat(fd, st)
diff --git a/src/syscall/syscall_linux_mipsx.go b/src/syscall/syscall_linux_mipsx.go
index 7d4f8f22..aa087926 100644
--- a/src/syscall/syscall_linux_mipsx.go
+++ b/src/syscall/syscall_linux_mipsx.go
@@ -117,96 +117,6 @@ func mmap(addr uintptr, length uintptr, prot int, flags int, fd int, offset int6
 	return mmap2(addr, length, prot, flags, fd, page)
 }
 
-const rlimInf32 = ^uint32(0)
-const rlimInf64 = ^uint64(0)
-
-type rlimit32 struct {
-	Cur uint32
-	Max uint32
-}
-
-//sysnb getrlimit(resource int, rlim *rlimit32) (err error) = SYS_GETRLIMIT
-
-func Getrlimit(resource int, rlim *Rlimit) (err error) {
-	err = prlimit(0, resource, nil, rlim)
-	if err != ENOSYS {
-		return err
-	}
-
-	rl := rlimit32{}
-	err = getrlimit(resource, &rl)
-	if err != nil {
-		return
-	}
-
-	if rl.Cur == rlimInf32 {
-		rlim.Cur = rlimInf64
-	} else {
-		rlim.Cur = uint64(rl.Cur)
-	}
-
-	if rl.Max == rlimInf32 {
-		rlim.Max = rlimInf64
-	} else {
-		rlim.Max = uint64(rl.Max)
-	}
-	return
-}
-
-//sysnb setrlimit1(resource int, rlim *rlimit32) (err error) = SYS_SETRLIMIT
-
-func setrlimit(resource int, rlim *Rlimit) (err error) {
-	err = prlimit(0, resource, rlim, nil)
-	if err != ENOSYS {
-		return err
-	}
-
-	rl := rlimit32{}
-	if rlim.Cur == rlimInf64 {
-		rl.Cur = rlimInf32
-	} else if rlim.Cur < uint64(rlimInf32) {
-		rl.Cur = uint32(rlim.Cur)
-	} else {
-		return EINVAL
-	}
-	if rlim.Max == rlimInf64 {
-		rl.Max = rlimInf32
-	} else if rlim.Max < uint64(rlimInf32) {
-		rl.Max = uint32(rlim.Max)
-	} else {
-		return EINVAL
-	}
-
-	return setrlimit1(resource, &rl)
-}
-
-//go:nosplit
-func rawSetrlimit(resource int, rlim *Rlimit) Errno {
-	_, _, errno := RawSyscall6(SYS_PRLIMIT64, 0, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0, 0, 0)
-	if errno != ENOSYS {
-		return errno
-	}
-
-	rl := rlimit32{}
-	if rlim.Cur == rlimInf64 {
-		rl.Cur = rlimInf32
-	} else if rlim.Cur < uint64(rlimInf32) {
-		rl.Cur = uint32(rlim.Cur)
-	} else {
-		return EINVAL
-	}
-	if rlim.Max == rlimInf64 {
-		rl.Max = rlimInf32
-	} else if rlim.Max < uint64(rlimInf32) {
-		rl.Max = uint32(rlim.Max)
-	} else {
-		return EINVAL
-	}
-
-	_, _, errno = RawSyscall(SYS_SETRLIMIT, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0)
-	return errno
-}
-
 func (r *PtraceRegs) PC() uint64 { return uint64(r.Regs[64]) }
 
 func (r *PtraceRegs) SetPC(pc uint64) { r.Regs[64] = uint32(pc) }
diff --git a/src/syscall/syscall_linux_ppc64x.go b/src/syscall/syscall_linux_ppc64x.go
index 13c184c4..12424023 100644
--- a/src/syscall/syscall_linux_ppc64x.go
+++ b/src/syscall/syscall_linux_ppc64x.go
@@ -6,10 +6,6 @@
 
 package syscall
 
-import (
-	"unsafe"
-)
-
 const (
 	_SYS_setgroups  = SYS_SETGROUPS
 	_SYS_clone3     = 435
@@ -27,7 +23,6 @@ const (
 //sysnb	Getegid() (egid int)
 //sysnb	Geteuid() (euid int)
 //sysnb	Getgid() (gid int)
-//sysnb	Getrlimit(resource int, rlim *Rlimit) (err error) = SYS_UGETRLIMIT
 //sysnb	Getuid() (uid int)
 //sysnb	InotifyInit() (fd int, err error)
 //sys	Ioperm(from int, num int, on int) (err error)
@@ -44,7 +39,6 @@ const (
 //sys	sendfile(outfd int, infd int, offset *int64, count int) (written int, err error)
 //sys	Setfsgid(gid int) (err error)
 //sys	Setfsuid(uid int) (err error)
-//sysnb	setrlimit(resource int, rlim *Rlimit) (err error) = SYS_SETRLIMIT
 //sys	Shutdown(fd int, how int) (err error)
 //sys	Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int64, err error)
 //sys	Stat(path string, stat *Stat_t) (err error)
@@ -73,12 +67,6 @@ const (
 //sys	Utime(path string, buf *Utimbuf) (err error)
 //sys	utimes(path string, times *[2]Timeval) (err error)
 
-//go:nosplit
-func rawSetrlimit(resource int, rlim *Rlimit) Errno {
-	_, _, errno := RawSyscall(SYS_SETRLIMIT, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0)
-	return errno
-}
-
 func setTimespec(sec, nsec int64) Timespec {
 	return Timespec{Sec: sec, Nsec: nsec}
 }
diff --git a/src/syscall/syscall_linux_riscv64.go b/src/syscall/syscall_linux_riscv64.go
index 00872a74..c9159762 100644
--- a/src/syscall/syscall_linux_riscv64.go
+++ b/src/syscall/syscall_linux_riscv64.go
@@ -27,7 +27,6 @@ func Fstatat(fd int, path string, stat *Stat_t, flags int) error {
 //sysnb	Getegid() (egid int)
 //sysnb	Geteuid() (euid int)
 //sysnb	Getgid() (gid int)
-//sysnb	Getrlimit(resource int, rlim *Rlimit) (err error)
 //sysnb	Getuid() (uid int)
 //sys	Listen(s int, n int) (err error)
 //sys	pread(fd int, p []byte, offset int64) (n int, err error) = SYS_PREAD64
@@ -37,7 +36,6 @@ func Fstatat(fd int, path string, stat *Stat_t, flags int) error {
 //sys	sendfile(outfd int, infd int, offset *int64, count int) (written int, err error)
 //sys	Setfsgid(gid int) (err error)
 //sys	Setfsuid(uid int) (err error)
-//sysnb	setrlimit(resource int, rlim *Rlimit) (err error) = SYS_SETRLIMIT
 //sys	Shutdown(fd int, how int) (err error)
 //sys	Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int64, err error)
 
@@ -144,12 +142,6 @@ func utimes(path string, tv *[2]Timeval) (err error) {
 	return utimensat(_AT_FDCWD, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), 0)
 }
 
-//go:nosplit
-func rawSetrlimit(resource int, rlim *Rlimit) Errno {
-	_, _, errno := RawSyscall(SYS_SETRLIMIT, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0)
-	return errno
-}
-
 func (r *PtraceRegs) PC() uint64 { return r.Pc }
 
 func (r *PtraceRegs) SetPC(pc uint64) { r.Pc = pc }
diff --git a/src/syscall/syscall_linux_s390x.go b/src/syscall/syscall_linux_s390x.go
index ea667ec1..65c86140 100644
--- a/src/syscall/syscall_linux_s390x.go
+++ b/src/syscall/syscall_linux_s390x.go
@@ -23,7 +23,6 @@ const (
 //sysnb	Getegid() (egid int)
 //sysnb	Geteuid() (euid int)
 //sysnb	Getgid() (gid int)
-//sysnb	Getrlimit(resource int, rlim *Rlimit) (err error) = SYS_GETRLIMIT
 //sysnb	Getuid() (uid int)
 //sysnb	InotifyInit() (fd int, err error)
 //sys	Lchown(path string, uid int, gid int) (err error)
@@ -37,7 +36,6 @@ const (
 //sys	sendfile(outfd int, infd int, offset *int64, count int) (written int, err error)
 //sys	Setfsgid(gid int) (err error)
 //sys	Setfsuid(uid int) (err error)
-//sysnb	setrlimit(resource int, rlim *Rlimit) (err error) = SYS_SETRLIMIT
 //sys	Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int64, err error)
 //sys	Stat(path string, stat *Stat_t) (err error)
 //sys	Statfs(path string, buf *Statfs_t) (err error)
@@ -244,12 +242,6 @@ func Shutdown(s, how int) (err error) {
 	return
 }
 
-//go:nosplit
-func rawSetrlimit(resource int, rlim *Rlimit) Errno {
-	_, _, errno := RawSyscall(SYS_SETRLIMIT, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0)
-	return errno
-}
-
 func (r *PtraceRegs) PC() uint64 { return r.Psw.Addr }
 
 func (r *PtraceRegs) SetPC(pc uint64) { r.Psw.Addr = pc }
diff --git a/src/syscall/syscall_linux_test.go b/src/syscall/syscall_linux_test.go
index d7543ceb..c719be52 100644
--- a/src/syscall/syscall_linux_test.go
+++ b/src/syscall/syscall_linux_test.go
@@ -5,6 +5,7 @@
 package syscall_test
 
 import (
+	"context"
 	"fmt"
 	"internal/testenv"
 	"io"
@@ -22,28 +23,6 @@ import (
 	"unsafe"
 )
 
-// chtmpdir changes the working directory to a new temporary directory and
-// provides a cleanup function. Used when PWD is read-only.
-func chtmpdir(t *testing.T) func() {
-	oldwd, err := os.Getwd()
-	if err != nil {
-		t.Fatalf("chtmpdir: %v", err)
-	}
-	d, err := os.MkdirTemp("", "test")
-	if err != nil {
-		t.Fatalf("chtmpdir: %v", err)
-	}
-	if err := os.Chdir(d); err != nil {
-		t.Fatalf("chtmpdir: %v", err)
-	}
-	return func() {
-		if err := os.Chdir(oldwd); err != nil {
-			t.Fatalf("chtmpdir: %v", err)
-		}
-		os.RemoveAll(d)
-	}
-}
-
 func touch(t *testing.T, name string) {
 	f, err := os.Create(name)
 	if err != nil {
@@ -63,7 +42,7 @@ const (
 )
 
 func TestFaccessat(t *testing.T) {
-	defer chtmpdir(t)()
+	t.Chdir(t.TempDir())
 	touch(t, "file1")
 
 	err := syscall.Faccessat(_AT_FDCWD, "file1", _R_OK, 0)
@@ -115,7 +94,7 @@ func TestFaccessat(t *testing.T) {
 }
 
 func TestFchmodat(t *testing.T) {
-	defer chtmpdir(t)()
+	t.Chdir(t.TempDir())
 
 	touch(t, "file1")
 	os.Symlink("file1", "symlink1")
@@ -212,12 +191,8 @@ func TestSyscallNoError(t *testing.T) {
 	}
 
 	// Copy the test binary to a location that a non-root user can read/execute
-	// after we drop privileges
-	tempDir, err := os.MkdirTemp("", "TestSyscallNoError")
-	if err != nil {
-		t.Fatalf("cannot create temporary directory: %v", err)
-	}
-	defer os.RemoveAll(tempDir)
+	// after we drop privileges.
+	tempDir := t.TempDir()
 	os.Chmod(tempDir, 0755)
 
 	tmpBinary := filepath.Join(tempDir, filepath.Base(os.Args[0]))
@@ -524,6 +499,9 @@ func TestSetuidEtc(t *testing.T) {
 	if syscall.Getuid() != 0 {
 		t.Skip("skipping root only test")
 	}
+	if syscall.Getgid() != 0 {
+		t.Skip("skipping the test when root's gid is not default value 0")
+	}
 	if testing.Short() && testenv.Builder() != "" && os.Getenv("USER") == "swarming" {
 		// The Go build system's swarming user is known not to be root.
 		// Unfortunately, it sometimes appears as root due the current
@@ -720,3 +698,197 @@ func TestPrlimitOtherProcess(t *testing.T) {
 		t.Fatalf("origRlimitNofile got=%v, want=%v", rlimLater, rlimOrig)
 	}
 }
+
+const magicRlimitValue = 42
+
+// TestPrlimitFileLimit tests that we can start a Go program, use
+// prlimit to change its NOFILE limit, and have that updated limit be
+// seen by children. See issue #66797.
+func TestPrlimitFileLimit(t *testing.T) {
+	switch os.Getenv("GO_WANT_HELPER_PROCESS") {
+	case "prlimit1":
+		testPrlimitFileLimitHelper1(t)
+		return
+	case "prlimit2":
+		testPrlimitFileLimitHelper2(t)
+		return
+	}
+
+	origRlimitNofile := syscall.GetInternalOrigRlimitNofile()
+	defer origRlimitNofile.Store(origRlimitNofile.Load())
+
+	// Set our rlimit to magic+1/max.
+	// That will also become the rlimit of the child.
+
+	var lim syscall.Rlimit
+	if err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &lim); err != nil {
+		t.Fatal(err)
+	}
+	max := lim.Max
+
+	lim = syscall.Rlimit{
+		Cur: magicRlimitValue + 1,
+		Max: max,
+	}
+	if err := syscall.Setrlimit(syscall.RLIMIT_NOFILE, &lim); err != nil {
+		t.Fatal(err)
+	}
+
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	exe, err := os.Executable()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	r1, w1, err := os.Pipe()
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer r1.Close()
+	defer w1.Close()
+
+	r2, w2, err := os.Pipe()
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer r2.Close()
+	defer w2.Close()
+
+	var output strings.Builder
+
+	const arg = "-test.run=^TestPrlimitFileLimit$"
+	cmd := testenv.CommandContext(t, ctx, exe, arg, "-test.v")
+	cmd = testenv.CleanCmdEnv(cmd)
+	cmd.Env = append(cmd.Env, "GO_WANT_HELPER_PROCESS=prlimit1")
+	cmd.ExtraFiles = []*os.File{r1, w2}
+	cmd.Stdout = &output
+	cmd.Stderr = &output
+
+	t.Logf("running %s %s", exe, arg)
+
+	if err := cmd.Start(); err != nil {
+		t.Fatal(err)
+	}
+
+	// Wait for the child to start.
+	b := make([]byte, 1)
+	if n, err := r2.Read(b); err != nil {
+		t.Fatal(err)
+	} else if n != 1 {
+		t.Fatalf("read %d bytes, want 1", n)
+	}
+
+	// Set the child's prlimit.
+	lim = syscall.Rlimit{
+		Cur: magicRlimitValue,
+		Max: max,
+	}
+	if err := syscall.Prlimit(cmd.Process.Pid, syscall.RLIMIT_NOFILE, &lim, nil); err != nil {
+		t.Fatalf("Prlimit failed: %v", err)
+	}
+
+	// Tell the child to continue.
+	if n, err := w1.Write(b); err != nil {
+		t.Fatal(err)
+	} else if n != 1 {
+		t.Fatalf("wrote %d bytes, want 1", n)
+	}
+
+	err = cmd.Wait()
+	if output.Len() > 0 {
+		t.Logf("%s", output.String())
+	}
+
+	if err != nil {
+		t.Errorf("child failed: %v", err)
+	}
+}
+
+// testPrlimitFileLimitHelper1 is run by TestPrlimitFileLimit.
+func testPrlimitFileLimitHelper1(t *testing.T) {
+	var lim syscall.Rlimit
+	if err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &lim); err != nil {
+		t.Fatal(err)
+	}
+	t.Logf("helper1 rlimit is %v", lim)
+	t.Logf("helper1 cached rlimit is %v", syscall.OrigRlimitNofile())
+
+	// Tell the parent that we are ready.
+	b := []byte{0}
+	if n, err := syscall.Write(4, b); err != nil {
+		t.Fatal(err)
+	} else if n != 1 {
+		t.Fatalf("wrote %d bytes, want 1", n)
+	}
+
+	// Wait for the parent to tell us that prlimit was used.
+	if n, err := syscall.Read(3, b); err != nil {
+		t.Fatal(err)
+	} else if n != 1 {
+		t.Fatalf("read %d bytes, want 1", n)
+	}
+
+	if err := syscall.Close(3); err != nil {
+		t.Errorf("Close(3): %v", err)
+	}
+	if err := syscall.Close(4); err != nil {
+		t.Errorf("Close(4): %v", err)
+	}
+
+	if err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &lim); err != nil {
+		t.Fatal(err)
+	}
+	t.Logf("after prlimit helper1 rlimit is %v", lim)
+	t.Logf("after prlimit helper1 cached rlimit is %v", syscall.OrigRlimitNofile())
+
+	// Start the grandchild, which should see the rlimit
+	// set by the prlimit called by the parent.
+
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	exe, err := os.Executable()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	const arg = "-test.run=^TestPrlimitFileLimit$"
+	cmd := testenv.CommandContext(t, ctx, exe, arg, "-test.v")
+	cmd = testenv.CleanCmdEnv(cmd)
+	cmd.Env = append(cmd.Env, "GO_WANT_HELPER_PROCESS=prlimit2")
+	t.Logf("running %s %s", exe, arg)
+	out, err := cmd.CombinedOutput()
+	if len(out) > 0 {
+		t.Logf("%s", out)
+	}
+	if err != nil {
+		t.Errorf("grandchild failed: %v", err)
+	} else {
+		fmt.Println("OK")
+	}
+}
+
+// testPrlimitFileLimitHelper2 is run by testPrlimitFileLimit1.
+func testPrlimitFileLimitHelper2(t *testing.T) {
+	var lim syscall.Rlimit
+	if err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &lim); err != nil {
+		t.Fatal(err)
+	}
+
+	t.Logf("helper2 rlimit is %v", lim)
+	cached := syscall.OrigRlimitNofile()
+	t.Logf("helper2 cached rlimit is %v", cached)
+
+	// The value return by Getrlimit will have been adjusted.
+	// We should have cached the value set by prlimit called by the parent.
+
+	if cached == nil {
+		t.Fatal("no cached rlimit")
+	} else if cached.Cur != magicRlimitValue {
+		t.Fatalf("cached rlimit is %d, want %d", cached.Cur, magicRlimitValue)
+	}
+
+	fmt.Println("OK")
+}
diff --git a/src/syscall/syscall_openbsd_libc.go b/src/syscall/syscall_openbsd_libc.go
index 5dea268c..13311398 100644
--- a/src/syscall/syscall_openbsd_libc.go
+++ b/src/syscall/syscall_openbsd_libc.go
@@ -79,7 +79,6 @@ func syscall9X(fn, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2 uintptr,
 //sysnb execve(path *byte, argv **byte, envp **byte) (err error)
 //sysnb exit(res int) (err error)
 //sys   ptrace(request int, pid int, addr uintptr, data uintptr) (err error)
-//sysnb getentropy(p []byte) (err error)
 //sys   fstatat(fd int, path string, stat *Stat_t, flags int) (err error)
 //sys   unlinkat(fd int, path string, flags int) (err error)
 //sys   openat(fd int, path string, flags int, perm uint32) (fdret int, err error)
diff --git a/src/syscall/syscall_wasip1.go b/src/syscall/syscall_wasip1.go
index 84c6bddc..c9225293 100644
--- a/src/syscall/syscall_wasip1.go
+++ b/src/syscall/syscall_wasip1.go
@@ -216,12 +216,14 @@ const (
 	O_WRONLY = 1
 	O_RDWR   = 2
 
-	O_CREAT  = 0100
-	O_CREATE = O_CREAT
-	O_TRUNC  = 01000
-	O_APPEND = 02000
-	O_EXCL   = 0200
-	O_SYNC   = 010000
+	O_CREAT     = 0100
+	O_CREATE    = O_CREAT
+	O_TRUNC     = 01000
+	O_APPEND    = 02000
+	O_EXCL      = 0200
+	O_SYNC      = 010000
+	O_DIRECTORY = 020000
+	O_NOFOLLOW  = 0400
 
 	O_CLOEXEC = 0
 )
@@ -307,7 +309,7 @@ func (w WaitStatus) TrapCause() int     { return 0 }
 
 // Rusage is a placeholder to allow compilation of the [os/exec] package
 // because we need Go programs to be portable across platforms. WASI does
-// not have a mechanism to to spawn processes so there is no reason for an
+// not have a mechanism to spawn processes so there is no reason for an
 // application to take a dependency on this type.
 type Rusage struct {
 	Utime Timeval
@@ -316,7 +318,7 @@ type Rusage struct {
 
 // ProcAttr is a placeholder to allow compilation of the [os/exec] package
 // because we need Go programs to be portable across platforms. WASI does
-// not have a mechanism to to spawn processes so there is no reason for an
+// not have a mechanism to spawn processes so there is no reason for an
 // application to take a dependency on this type.
 type ProcAttr struct {
 	Dir   string
@@ -381,7 +383,7 @@ func Getppid() int {
 
 func Gettimeofday(tv *Timeval) error {
 	var time timestamp
-	if errno := clock_time_get(clockRealtime, 1e3, unsafe.Pointer(&time)); errno != 0 {
+	if errno := clock_time_get(clockRealtime, 1e3, &time); errno != 0 {
 		return errno
 	}
 	tv.setTimestamp(time)
@@ -463,7 +465,7 @@ const (
 
 //go:wasmimport wasi_snapshot_preview1 clock_time_get
 //go:noescape
-func clock_time_get(id clockid, precision timestamp, time unsafe.Pointer) Errno
+func clock_time_get(id clockid, precision timestamp, time *timestamp) Errno
 
 func SetNonblock(fd int, nonblocking bool) error {
 	flags, err := fd_fdstat_get_flags(fd)
diff --git a/src/syscall/syscall_windows.go b/src/syscall/syscall_windows.go
index d49ee522..05c29c7b 100644
--- a/src/syscall/syscall_windows.go
+++ b/src/syscall/syscall_windows.go
@@ -323,6 +323,7 @@ func NewCallbackCDecl(fn any) uintptr {
 //sys	Process32First(snapshot Handle, procEntry *ProcessEntry32) (err error) = kernel32.Process32FirstW
 //sys	Process32Next(snapshot Handle, procEntry *ProcessEntry32) (err error) = kernel32.Process32NextW
 //sys	DeviceIoControl(handle Handle, ioControlCode uint32, inBuffer *byte, inBufferSize uint32, outBuffer *byte, outBufferSize uint32, bytesReturned *uint32, overlapped *Overlapped) (err error)
+//sys	setFileInformationByHandle(handle Handle, fileInformationClass uint32, buf unsafe.Pointer, bufsize uint32) (err error) = kernel32.SetFileInformationByHandle
 // This function returns 1 byte BOOLEAN rather than the 4 byte BOOL.
 //sys	CreateSymbolicLink(symlinkfilename *uint16, targetfilename *uint16, flags uint32) (err error) [failretval&0xff==0] = CreateSymbolicLinkW
 //sys	CreateHardLink(filename *uint16, existingfilename *uint16, reserved uintptr) (err error) [failretval&0xff==0] = CreateHardLinkW
@@ -340,16 +341,16 @@ func makeInheritSa() *SecurityAttributes {
 	return &sa
 }
 
-func Open(path string, mode int, perm uint32) (fd Handle, err error) {
-	if len(path) == 0 {
+func Open(name string, flag int, perm uint32) (fd Handle, err error) {
+	if len(name) == 0 {
 		return InvalidHandle, ERROR_FILE_NOT_FOUND
 	}
-	pathp, err := UTF16PtrFromString(path)
+	namep, err := UTF16PtrFromString(name)
 	if err != nil {
 		return InvalidHandle, err
 	}
 	var access uint32
-	switch mode & (O_RDONLY | O_WRONLY | O_RDWR) {
+	switch flag & (O_RDONLY | O_WRONLY | O_RDWR) {
 	case O_RDONLY:
 		access = GENERIC_READ
 	case O_WRONLY:
@@ -357,64 +358,71 @@ func Open(path string, mode int, perm uint32) (fd Handle, err error) {
 	case O_RDWR:
 		access = GENERIC_READ | GENERIC_WRITE
 	}
-	if mode&O_CREAT != 0 {
+	if flag&O_CREAT != 0 {
 		access |= GENERIC_WRITE
 	}
-	if mode&O_APPEND != 0 {
-		access &^= GENERIC_WRITE
-		access |= FILE_APPEND_DATA
+	if flag&O_APPEND != 0 {
+		// Remove GENERIC_WRITE unless O_TRUNC is set, in which case we need it to truncate the file.
+		// We can't just remove FILE_WRITE_DATA because GENERIC_WRITE without FILE_WRITE_DATA
+		// starts appending at the beginning of the file rather than at the end.
+		if flag&O_TRUNC == 0 {
+			access &^= GENERIC_WRITE
+		}
+		// Set all access rights granted by GENERIC_WRITE except for FILE_WRITE_DATA.
+		access |= FILE_APPEND_DATA | FILE_WRITE_ATTRIBUTES | _FILE_WRITE_EA | STANDARD_RIGHTS_WRITE | SYNCHRONIZE
 	}
 	sharemode := uint32(FILE_SHARE_READ | FILE_SHARE_WRITE)
 	var sa *SecurityAttributes
-	if mode&O_CLOEXEC == 0 {
+	if flag&O_CLOEXEC == 0 {
 		sa = makeInheritSa()
 	}
+	// We don't use CREATE_ALWAYS, because when opening a file with
+	// FILE_ATTRIBUTE_READONLY these will replace an existing file
+	// with a new, read-only one. See https://go.dev/issue/38225.
+	//
+	// Instead, we ftruncate the file after opening when O_TRUNC is set.
 	var createmode uint32
 	switch {
-	case mode&(O_CREAT|O_EXCL) == (O_CREAT | O_EXCL):
+	case flag&(O_CREAT|O_EXCL) == (O_CREAT | O_EXCL):
 		createmode = CREATE_NEW
-	case mode&(O_CREAT|O_TRUNC) == (O_CREAT | O_TRUNC):
-		createmode = CREATE_ALWAYS
-	case mode&O_CREAT == O_CREAT:
+	case flag&O_CREAT == O_CREAT:
 		createmode = OPEN_ALWAYS
-	case mode&O_TRUNC == O_TRUNC:
-		createmode = TRUNCATE_EXISTING
 	default:
 		createmode = OPEN_EXISTING
 	}
 	var attrs uint32 = FILE_ATTRIBUTE_NORMAL
 	if perm&S_IWRITE == 0 {
 		attrs = FILE_ATTRIBUTE_READONLY
-		if createmode == CREATE_ALWAYS {
-			// We have been asked to create a read-only file.
-			// If the file already exists, the semantics of
-			// the Unix open system call is to preserve the
-			// existing permissions. If we pass CREATE_ALWAYS
-			// and FILE_ATTRIBUTE_READONLY to CreateFile,
-			// and the file already exists, CreateFile will
-			// change the file permissions.
-			// Avoid that to preserve the Unix semantics.
-			h, e := CreateFile(pathp, access, sharemode, sa, TRUNCATE_EXISTING, FILE_ATTRIBUTE_NORMAL, 0)
-			switch e {
-			case ERROR_FILE_NOT_FOUND, _ERROR_BAD_NETPATH, ERROR_PATH_NOT_FOUND:
-				// File does not exist. These are the same
-				// errors as Errno.Is checks for ErrNotExist.
-				// Carry on to create the file.
-			default:
-				// Success or some different error.
-				return h, e
-			}
-		}
 	}
-	if createmode == OPEN_EXISTING && access == GENERIC_READ {
-		// Necessary for opening directory handles.
+	if flag&O_WRONLY == 0 && flag&O_RDWR == 0 {
+		// We might be opening or creating a directory.
+		// CreateFile requires FILE_FLAG_BACKUP_SEMANTICS
+		// to work with directories.
 		attrs |= FILE_FLAG_BACKUP_SEMANTICS
 	}
-	if mode&O_SYNC != 0 {
+	if flag&O_SYNC != 0 {
 		const _FILE_FLAG_WRITE_THROUGH = 0x80000000
 		attrs |= _FILE_FLAG_WRITE_THROUGH
 	}
-	return CreateFile(pathp, access, sharemode, sa, createmode, attrs, 0)
+	h, err := CreateFile(namep, access, sharemode, sa, createmode, attrs, 0)
+	if err != nil {
+		if err == ERROR_ACCESS_DENIED && (flag&O_WRONLY != 0 || flag&O_RDWR != 0) {
+			// We should return EISDIR when we are trying to open a directory with write access.
+			fa, e1 := GetFileAttributes(namep)
+			if e1 == nil && fa&FILE_ATTRIBUTE_DIRECTORY != 0 {
+				err = EISDIR
+			}
+		}
+		return InvalidHandle, err
+	}
+	if flag&O_TRUNC == O_TRUNC {
+		err = Ftruncate(h, 0)
+		if err != nil {
+			CloseHandle(h)
+			return InvalidHandle, err
+		}
+	}
+	return h, nil
 }
 
 func Read(fd Handle, p []byte) (n int, err error) {
@@ -610,20 +618,13 @@ func ComputerName() (name string, err error) {
 }
 
 func Ftruncate(fd Handle, length int64) (err error) {
-	curoffset, e := Seek(fd, 0, 1)
-	if e != nil {
-		return e
+	type _FILE_END_OF_FILE_INFO struct {
+		EndOfFile int64
 	}
-	defer Seek(fd, curoffset, 0)
-	_, e = Seek(fd, length, 0)
-	if e != nil {
-		return e
-	}
-	e = SetEndOfFile(fd)
-	if e != nil {
-		return e
-	}
-	return nil
+	const FileEndOfFileInfo = 6
+	var info _FILE_END_OF_FILE_INFO
+	info.EndOfFile = length
+	return setFileInformationByHandle(fd, FileEndOfFileInfo, unsafe.Pointer(&info), uint32(unsafe.Sizeof(info)))
 }
 
 func Gettimeofday(tv *Timeval) (err error) {
diff --git a/src/syscall/syscall_windows_test.go b/src/syscall/syscall_windows_test.go
index a6c6eff3..882a2796 100644
--- a/src/syscall/syscall_windows_test.go
+++ b/src/syscall/syscall_windows_test.go
@@ -15,25 +15,40 @@ import (
 	"testing"
 )
 
-func TestOpen_Dir(t *testing.T) {
-	dir := t.TempDir()
+func TestOpen(t *testing.T) {
+	t.Parallel()
 
-	h, err := syscall.Open(dir, syscall.O_RDONLY, 0)
+	dir := t.TempDir()
+	file := filepath.Join(dir, "a")
+	f, err := os.Create(file)
 	if err != nil {
-		t.Fatalf("Open failed: %v", err)
+		t.Fatal(err)
 	}
-	syscall.CloseHandle(h)
-	h, err = syscall.Open(dir, syscall.O_RDONLY|syscall.O_TRUNC, 0)
-	if err == nil {
-		t.Error("Open should have failed")
-	} else {
-		syscall.CloseHandle(h)
+	f.Close()
+
+	tests := []struct {
+		path string
+		flag int
+		err  error
+	}{
+		{dir, syscall.O_RDONLY, nil},
+		{dir, syscall.O_CREAT, nil},
+		{dir, syscall.O_RDONLY | syscall.O_CREAT, nil},
+		{file, syscall.O_APPEND | syscall.O_WRONLY | os.O_CREATE, nil},
+		{file, syscall.O_APPEND | syscall.O_WRONLY | os.O_CREATE | os.O_TRUNC, nil},
+		{dir, syscall.O_RDONLY | syscall.O_TRUNC, syscall.ERROR_ACCESS_DENIED},
+		{dir, syscall.O_WRONLY | syscall.O_RDWR, syscall.EISDIR},
+		{dir, syscall.O_WRONLY, syscall.EISDIR},
+		{dir, syscall.O_RDWR, syscall.EISDIR},
 	}
-	h, err = syscall.Open(dir, syscall.O_RDONLY|syscall.O_CREAT, 0)
-	if err == nil {
-		t.Error("Open should have failed")
-	} else {
-		syscall.CloseHandle(h)
+	for i, tt := range tests {
+		h, err := syscall.Open(tt.path, tt.flag, 0o660)
+		if err == nil {
+			syscall.CloseHandle(h)
+		}
+		if err != tt.err {
+			t.Errorf("%d: Open got %q, want %q", i, err, tt.err)
+		}
 	}
 }
 
@@ -182,12 +197,14 @@ int main(int argc, char *argv[])
 
 func TestGetwd_DoesNotPanicWhenPathIsLong(t *testing.T) {
 	// Regression test for https://github.com/golang/go/issues/60051.
+	tmp := t.TempDir()
+	t.Chdir(tmp)
 
 	// The length of a filename is also limited, so we can't reproduce the
 	// crash by creating a single directory with a very long name; we need two
 	// layers.
 	a200 := strings.Repeat("a", 200)
-	dirname := filepath.Join(t.TempDir(), a200, a200)
+	dirname := filepath.Join(tmp, a200, a200)
 
 	err := os.MkdirAll(dirname, 0o700)
 	if err != nil {
@@ -197,9 +214,6 @@ func TestGetwd_DoesNotPanicWhenPathIsLong(t *testing.T) {
 	if err != nil {
 		t.Skipf("Chdir failed: %v", err)
 	}
-	// Change out of the temporary directory so that we don't inhibit its
-	// removal during test cleanup.
-	defer os.Chdir(`\`)
 
 	syscall.Getwd()
 }
diff --git a/src/syscall/tables_wasip1.go b/src/syscall/tables_wasip1.go
index 973a56e2..be178c1c 100644
--- a/src/syscall/tables_wasip1.go
+++ b/src/syscall/tables_wasip1.go
@@ -86,6 +86,7 @@ const (
 	ETXTBSY         Errno = 74
 	EXDEV           Errno = 75
 	ENOTCAPABLE     Errno = 76
+	EBADFD          Errno = 77
 	// needed by src/net/error_unix_test.go
 	EOPNOTSUPP = ENOTSUP
 )
@@ -100,6 +101,7 @@ var errorstr = [...]string{
 	EAGAIN:          "Try again",
 	EALREADY:        "Socket already connected",
 	EBADF:           "Bad file number",
+	EBADFD:          "file descriptor in bad state",
 	EBADMSG:         "Trying to read unreadable message",
 	EBUSY:           "Device or resource busy",
 	ECANCELED:       "Operation canceled.",
diff --git a/src/syscall/types_windows.go b/src/syscall/types_windows.go
index 37d0eff0..f08ebe01 100644
--- a/src/syscall/types_windows.go
+++ b/src/syscall/types_windows.go
@@ -34,18 +34,21 @@ const (
 
 const (
 	// Invented values to support what package os expects.
-	O_RDONLY   = 0x00000
-	O_WRONLY   = 0x00001
-	O_RDWR     = 0x00002
-	O_CREAT    = 0x00040
-	O_EXCL     = 0x00080
-	O_NOCTTY   = 0x00100
-	O_TRUNC    = 0x00200
-	O_NONBLOCK = 0x00800
-	O_APPEND   = 0x00400
-	O_SYNC     = 0x01000
-	O_ASYNC    = 0x02000
-	O_CLOEXEC  = 0x80000
+	O_RDONLY       = 0x00000
+	O_WRONLY       = 0x00001
+	O_RDWR         = 0x00002
+	O_CREAT        = 0x00040
+	O_EXCL         = 0x00080
+	O_NOCTTY       = 0x00100
+	O_TRUNC        = 0x00200
+	O_NONBLOCK     = 0x00800
+	O_APPEND       = 0x00400
+	O_SYNC         = 0x01000
+	O_ASYNC        = 0x02000
+	O_CLOEXEC      = 0x80000
+	o_DIRECTORY    = 0x100000   // used by internal/syscall/windows
+	o_NOFOLLOW_ANY = 0x20000000 // used by internal/syscall/windows
+	o_OPEN_REPARSE = 0x40000000 // used by internal/syscall/windows
 )
 
 const (
@@ -91,6 +94,7 @@ const (
 
 	FILE_LIST_DIRECTORY   = 0x00000001
 	FILE_APPEND_DATA      = 0x00000004
+	_FILE_WRITE_EA        = 0x00000010
 	FILE_WRITE_ATTRIBUTES = 0x00000100
 
 	FILE_SHARE_READ              = 0x00000001
diff --git a/src/syscall/zerrors_darwin_amd64.go b/src/syscall/zerrors_darwin_amd64.go
index ecbe89c5..bad1f889 100644
--- a/src/syscall/zerrors_darwin_amd64.go
+++ b/src/syscall/zerrors_darwin_amd64.go
@@ -1,11 +1,9 @@
 // mkerrors.sh -m64
 // Code generated by the command above; DO NOT EDIT.
 
-// Created by cgo -godefs - DO NOT EDIT
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
 // cgo -godefs -- -m64 _const.go
 
-//go:build amd64 && darwin
-
 package syscall
 
 const (
diff --git a/src/syscall/zerrors_darwin_arm64.go b/src/syscall/zerrors_darwin_arm64.go
index fa7cb845..53236ca4 100644
--- a/src/syscall/zerrors_darwin_arm64.go
+++ b/src/syscall/zerrors_darwin_arm64.go
@@ -1,11 +1,9 @@
 // mkerrors.sh -m64
 // Code generated by the command above; DO NOT EDIT.
 
-// Created by cgo -godefs - DO NOT EDIT
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
 // cgo -godefs -- -m64 _const.go
 
-//go:build arm64 && darwin
-
 package syscall
 
 const (
diff --git a/src/syscall/zerrors_dragonfly_amd64.go b/src/syscall/zerrors_dragonfly_amd64.go
index bca2f50c..d87ab132 100644
--- a/src/syscall/zerrors_dragonfly_amd64.go
+++ b/src/syscall/zerrors_dragonfly_amd64.go
@@ -1,11 +1,9 @@
 // mkerrors.sh -m64
 // Code generated by the command above; DO NOT EDIT.
 
-// Created by cgo -godefs - DO NOT EDIT
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
 // cgo -godefs -- -m64 _const.go
 
-//go:build amd64 && dragonfly
-
 package syscall
 
 const (
diff --git a/src/syscall/zerrors_freebsd_386.go b/src/syscall/zerrors_freebsd_386.go
index b1441e76..c59b7dae 100644
--- a/src/syscall/zerrors_freebsd_386.go
+++ b/src/syscall/zerrors_freebsd_386.go
@@ -1,11 +1,9 @@
 // mkerrors.sh -m32
 // Code generated by the command above; DO NOT EDIT.
 
-// Created by cgo -godefs - DO NOT EDIT
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
 // cgo -godefs -- -m32 _const.go
 
-//go:build 386 && freebsd
-
 package syscall
 
 const (
diff --git a/src/syscall/zerrors_freebsd_amd64.go b/src/syscall/zerrors_freebsd_amd64.go
index 3aed0049..305b8c66 100644
--- a/src/syscall/zerrors_freebsd_amd64.go
+++ b/src/syscall/zerrors_freebsd_amd64.go
@@ -1,11 +1,9 @@
 // mkerrors.sh -m64
 // Code generated by the command above; DO NOT EDIT.
 
-// Created by cgo -godefs - DO NOT EDIT
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
 // cgo -godefs -- -m64 _const.go
 
-//go:build amd64 && freebsd
-
 package syscall
 
 const (
diff --git a/src/syscall/zerrors_freebsd_arm.go b/src/syscall/zerrors_freebsd_arm.go
index e1f91ff8..9e082e30 100644
--- a/src/syscall/zerrors_freebsd_arm.go
+++ b/src/syscall/zerrors_freebsd_arm.go
@@ -1,11 +1,9 @@
 // mkerrors.sh
 // Code generated by the command above; DO NOT EDIT.
 
-// Created by cgo -godefs - DO NOT EDIT
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
 // cgo -godefs -- _const.go
 
-//go:build arm && freebsd
-
 package syscall
 
 const (
diff --git a/src/syscall/zerrors_freebsd_arm64.go b/src/syscall/zerrors_freebsd_arm64.go
index d0cb6c8a..305b8c66 100644
--- a/src/syscall/zerrors_freebsd_arm64.go
+++ b/src/syscall/zerrors_freebsd_arm64.go
@@ -1,8 +1,6 @@
 // mkerrors.sh -m64
 // Code generated by the command above; DO NOT EDIT.
 
-//go:build freebsd && arm64
-
 // Code generated by cmd/cgo -godefs; DO NOT EDIT.
 // cgo -godefs -- -m64 _const.go
 
diff --git a/src/syscall/zerrors_freebsd_riscv64.go b/src/syscall/zerrors_freebsd_riscv64.go
index 7aa9aa98..305b8c66 100644
--- a/src/syscall/zerrors_freebsd_riscv64.go
+++ b/src/syscall/zerrors_freebsd_riscv64.go
@@ -1,8 +1,6 @@
 // mkerrors.sh -m64
 // Code generated by the command above; DO NOT EDIT.
 
-//go:build freebsd && riscv64
-
 // Code generated by cmd/cgo -godefs; DO NOT EDIT.
 // cgo -godefs -- -m64 _const.go
 
diff --git a/src/syscall/zerrors_linux_386.go b/src/syscall/zerrors_linux_386.go
index 045a4166..9d4ecdeb 100644
--- a/src/syscall/zerrors_linux_386.go
+++ b/src/syscall/zerrors_linux_386.go
@@ -1,11 +1,9 @@
 // mkerrors.sh -m32
 // Code generated by the command above; DO NOT EDIT.
 
-// Created by cgo -godefs - DO NOT EDIT
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
 // cgo -godefs -- -m32 _const.go
 
-//go:build 386 && linux
-
 package syscall
 
 const (
diff --git a/src/syscall/zerrors_linux_amd64.go b/src/syscall/zerrors_linux_amd64.go
index 4eb44746..a8b67801 100644
--- a/src/syscall/zerrors_linux_amd64.go
+++ b/src/syscall/zerrors_linux_amd64.go
@@ -1,11 +1,9 @@
 // mkerrors.sh -m64
 // Code generated by the command above; DO NOT EDIT.
 
-// Created by cgo -godefs - DO NOT EDIT
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
 // cgo -godefs -- -m64 _const.go
 
-//go:build amd64 && linux
-
 package syscall
 
 const (
diff --git a/src/syscall/zerrors_linux_arm.go b/src/syscall/zerrors_linux_arm.go
index a5f925ec..285d26a5 100644
--- a/src/syscall/zerrors_linux_arm.go
+++ b/src/syscall/zerrors_linux_arm.go
@@ -1,11 +1,9 @@
 // mkerrors.sh
 // Code generated by the command above; DO NOT EDIT.
 
-// Created by cgo -godefs - DO NOT EDIT
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
 // cgo -godefs -- _const.go
 
-//go:build arm && linux
-
 package syscall
 
 const (
diff --git a/src/syscall/zerrors_linux_arm64.go b/src/syscall/zerrors_linux_arm64.go
index ec8ac070..d32a290a 100644
--- a/src/syscall/zerrors_linux_arm64.go
+++ b/src/syscall/zerrors_linux_arm64.go
@@ -1,11 +1,9 @@
 // mkerrors.sh
 // Code generated by the command above; DO NOT EDIT.
 
-// Created by cgo -godefs - DO NOT EDIT
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
 // cgo -godefs -- _const.go
 
-//go:build arm64 && linux
-
 package syscall
 
 const (
diff --git a/src/syscall/zerrors_linux_mips.go b/src/syscall/zerrors_linux_mips.go
index 3fe5c007..81657d1c 100644
--- a/src/syscall/zerrors_linux_mips.go
+++ b/src/syscall/zerrors_linux_mips.go
@@ -1,7 +1,7 @@
 // mkerrors.sh
 // Code generated by the command above; DO NOT EDIT.
 
-// Created by cgo -godefs - DO NOT EDIT
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
 // cgo -godefs -- _const.go
 
 package syscall
diff --git a/src/syscall/zerrors_linux_mips64.go b/src/syscall/zerrors_linux_mips64.go
index 74a1843e..6953c924 100644
--- a/src/syscall/zerrors_linux_mips64.go
+++ b/src/syscall/zerrors_linux_mips64.go
@@ -1,7 +1,7 @@
 // mkerrors.sh
 // Code generated by the command above; DO NOT EDIT.
 
-// Created by cgo -godefs - DO NOT EDIT
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
 // cgo -godefs _const.go
 
 package syscall
diff --git a/src/syscall/zerrors_linux_mips64le.go b/src/syscall/zerrors_linux_mips64le.go
index 74a1843e..6953c924 100644
--- a/src/syscall/zerrors_linux_mips64le.go
+++ b/src/syscall/zerrors_linux_mips64le.go
@@ -1,7 +1,7 @@
 // mkerrors.sh
 // Code generated by the command above; DO NOT EDIT.
 
-// Created by cgo -godefs - DO NOT EDIT
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
 // cgo -godefs _const.go
 
 package syscall
diff --git a/src/syscall/zerrors_linux_mipsle.go b/src/syscall/zerrors_linux_mipsle.go
index 3fe5c007..81657d1c 100644
--- a/src/syscall/zerrors_linux_mipsle.go
+++ b/src/syscall/zerrors_linux_mipsle.go
@@ -1,7 +1,7 @@
 // mkerrors.sh
 // Code generated by the command above; DO NOT EDIT.
 
-// Created by cgo -godefs - DO NOT EDIT
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
 // cgo -godefs -- _const.go
 
 package syscall
diff --git a/src/syscall/zerrors_linux_ppc64.go b/src/syscall/zerrors_linux_ppc64.go
index b63daea8..f0661a24 100644
--- a/src/syscall/zerrors_linux_ppc64.go
+++ b/src/syscall/zerrors_linux_ppc64.go
@@ -1,11 +1,9 @@
 // mkerrors.sh -m64
 // Code generated by the command above; DO NOT EDIT.
 
-// Created by cgo -godefs - DO NOT EDIT
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
 // cgo -godefs -- -m64 _const.go
 
-//go:build ppc64 && linux
-
 package syscall
 
 const (
diff --git a/src/syscall/zerrors_linux_ppc64le.go b/src/syscall/zerrors_linux_ppc64le.go
index 01f8adb0..73849d49 100644
--- a/src/syscall/zerrors_linux_ppc64le.go
+++ b/src/syscall/zerrors_linux_ppc64le.go
@@ -1,11 +1,9 @@
 // mkerrors.sh -m64
 // Code generated by the command above; DO NOT EDIT.
 
-// Created by cgo -godefs - DO NOT EDIT
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
 // cgo -godefs -- -m64 _const.go
 
-//go:build ppc64le && linux
-
 package syscall
 
 const (
diff --git a/src/syscall/zerrors_linux_riscv64.go b/src/syscall/zerrors_linux_riscv64.go
index f4b1d9ae..760d8742 100644
--- a/src/syscall/zerrors_linux_riscv64.go
+++ b/src/syscall/zerrors_linux_riscv64.go
@@ -1,7 +1,7 @@
 // mkerrors.sh
 // Code generated by the command above; DO NOT EDIT.
 
-// Created by cgo -godefs - DO NOT EDIT
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
 // cgo -godefs -- _const.go
 
 package syscall
diff --git a/src/syscall/zerrors_linux_s390x.go b/src/syscall/zerrors_linux_s390x.go
index 8b99a609..9abad9ed 100644
--- a/src/syscall/zerrors_linux_s390x.go
+++ b/src/syscall/zerrors_linux_s390x.go
@@ -1,7 +1,7 @@
 // mkerrors.sh -m64
 // Code generated by the command above; DO NOT EDIT.
 
-// Created by cgo -godefs - DO NOT EDIT
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
 // cgo -godefs -- -m64 _const.go
 
 package syscall
diff --git a/src/syscall/zerrors_netbsd_386.go b/src/syscall/zerrors_netbsd_386.go
index b2fcb657..6f21b562 100644
--- a/src/syscall/zerrors_netbsd_386.go
+++ b/src/syscall/zerrors_netbsd_386.go
@@ -1,11 +1,9 @@
 // mkerrors.sh -m32
 // Code generated by the command above; DO NOT EDIT.
 
-// Created by cgo -godefs - DO NOT EDIT
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
 // cgo -godefs -- -m32 _const.go
 
-//go:build 386 && netbsd
-
 package syscall
 
 const (
diff --git a/src/syscall/zerrors_netbsd_amd64.go b/src/syscall/zerrors_netbsd_amd64.go
index dc52c3ca..a404ac21 100644
--- a/src/syscall/zerrors_netbsd_amd64.go
+++ b/src/syscall/zerrors_netbsd_amd64.go
@@ -1,11 +1,9 @@
 // mkerrors.sh -m64
 // Code generated by the command above; DO NOT EDIT.
 
-// Created by cgo -godefs - DO NOT EDIT
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
 // cgo -godefs -- -m64 _const.go
 
-//go:build amd64 && netbsd
-
 package syscall
 
 const (
diff --git a/src/syscall/zerrors_netbsd_arm.go b/src/syscall/zerrors_netbsd_arm.go
index 3137e18a..fdf0ca0c 100644
--- a/src/syscall/zerrors_netbsd_arm.go
+++ b/src/syscall/zerrors_netbsd_arm.go
@@ -1,11 +1,9 @@
 // mkerrors.sh -marm
 // Code generated by the command above; DO NOT EDIT.
 
-// Created by cgo -godefs - DO NOT EDIT
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
 // cgo -godefs -- -marm _const.go
 
-//go:build arm && netbsd
-
 package syscall
 
 const (
diff --git a/src/syscall/zerrors_netbsd_arm64.go b/src/syscall/zerrors_netbsd_arm64.go
index cc1b0088..a404ac21 100644
--- a/src/syscall/zerrors_netbsd_arm64.go
+++ b/src/syscall/zerrors_netbsd_arm64.go
@@ -1,11 +1,9 @@
 // mkerrors.sh -m64
 // Code generated by the command above; DO NOT EDIT.
 
-// Created by cgo -godefs - DO NOT EDIT
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
 // cgo -godefs -- -m64 _const.go
 
-//go:build arm64 && netbsd
-
 package syscall
 
 const (
diff --git a/src/syscall/zerrors_openbsd_386.go b/src/syscall/zerrors_openbsd_386.go
index a37d6d16..4bdae34b 100644
--- a/src/syscall/zerrors_openbsd_386.go
+++ b/src/syscall/zerrors_openbsd_386.go
@@ -1,11 +1,9 @@
 // mkerrors.sh -m32
 // Code generated by the command above; DO NOT EDIT.
 
-// Created by cgo -godefs - DO NOT EDIT
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
 // cgo -godefs -- -m32 _const.go
 
-//go:build 386 && openbsd
-
 package syscall
 
 const (
diff --git a/src/syscall/zerrors_openbsd_amd64.go b/src/syscall/zerrors_openbsd_amd64.go
index 812fd950..69c68502 100644
--- a/src/syscall/zerrors_openbsd_amd64.go
+++ b/src/syscall/zerrors_openbsd_amd64.go
@@ -1,11 +1,9 @@
 // mkerrors.sh -m64
 // Code generated by the command above; DO NOT EDIT.
 
-// Created by cgo -godefs - DO NOT EDIT
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
 // cgo -godefs -- -m64 _const.go
 
-//go:build amd64 && openbsd
-
 package syscall
 
 const (
diff --git a/src/syscall/zerrors_openbsd_arm.go b/src/syscall/zerrors_openbsd_arm.go
index 2e19672b..dc6379b3 100644
--- a/src/syscall/zerrors_openbsd_arm.go
+++ b/src/syscall/zerrors_openbsd_arm.go
@@ -1,11 +1,9 @@
 // mkerrors.sh
 // Code generated by the command above; DO NOT EDIT.
 
-// Created by cgo -godefs - DO NOT EDIT
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
 // cgo -godefs -- _const.go
 
-//go:build arm && openbsd
-
 package syscall
 
 const (
diff --git a/src/syscall/zerrors_solaris_amd64.go b/src/syscall/zerrors_solaris_amd64.go
index b2c81d9a..094a78dc 100644
--- a/src/syscall/zerrors_solaris_amd64.go
+++ b/src/syscall/zerrors_solaris_amd64.go
@@ -1,11 +1,9 @@
 // mkerrors.sh -m64
 // Code generated by the command above; DO NOT EDIT.
 
-// Created by cgo -godefs - DO NOT EDIT
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
 // cgo -godefs -- -m64 _const.go
 
-//go:build amd64 && solaris
-
 package syscall
 
 const (
diff --git a/src/syscall/zsyscall_linux_386.go b/src/syscall/zsyscall_linux_386.go
index 661cfe7b..762fb007 100644
--- a/src/syscall/zsyscall_linux_386.go
+++ b/src/syscall/zsyscall_linux_386.go
@@ -1395,26 +1395,6 @@ func EpollWait(epfd int, events []EpollEvent, msec int) (n int, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func getrlimit(resource int, rlim *rlimit32) (err error) {
-	_, _, e1 := RawSyscall(SYS_GETRLIMIT, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
-func setrlimit1(resource int, rlim *rlimit32) (err error) {
-	_, _, e1 := RawSyscall(SYS_SETRLIMIT, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func futimesat(dirfd int, path string, times *[2]Timeval) (err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)
diff --git a/src/syscall/zsyscall_linux_amd64.go b/src/syscall/zsyscall_linux_amd64.go
index 9d057818..1249ff66 100644
--- a/src/syscall/zsyscall_linux_amd64.go
+++ b/src/syscall/zsyscall_linux_amd64.go
@@ -1160,16 +1160,6 @@ func Getgid() (gid int) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Getrlimit(resource int, rlim *Rlimit) (err error) {
-	_, _, e1 := RawSyscall(SYS_GETRLIMIT, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func Getuid() (uid int) {
 	r0, _ := rawSyscallNoError(SYS_GETUID, 0, 0, 0)
 	uid = int(r0)
@@ -1336,16 +1326,6 @@ func Setfsuid(uid int) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func setrlimit(resource int, rlim *Rlimit) (err error) {
-	_, _, e1 := RawSyscall(SYS_SETRLIMIT, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func Shutdown(fd int, how int) (err error) {
 	_, _, e1 := Syscall(SYS_SHUTDOWN, uintptr(fd), uintptr(how), 0)
 	if e1 != 0 {
diff --git a/src/syscall/zsyscall_linux_arm.go b/src/syscall/zsyscall_linux_arm.go
index a386120f..c359fe53 100644
--- a/src/syscall/zsyscall_linux_arm.go
+++ b/src/syscall/zsyscall_linux_arm.go
@@ -1,4 +1,4 @@
-// mksyscall.pl -l32 -arm -tags linux,arm syscall_linux.go syscall_linux_arm.go syscall_linux_accept.go
+// mksyscall.pl -l32 -arm -tags linux,arm syscall_linux.go syscall_linux_arm.go
 // Code generated by the command above; DO NOT EDIT.
 
 //go:build linux && arm
@@ -1595,34 +1595,3 @@ func EpollWait(epfd int, events []EpollEvent, msec int) (n int, err error) {
 	}
 	return
 }
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
-func getrlimit(resource int, rlim *rlimit32) (err error) {
-	_, _, e1 := RawSyscall(SYS_GETRLIMIT, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
-func setrlimit1(resource int, rlim *rlimit32) (err error) {
-	_, _, e1 := RawSyscall(SYS_SETRLIMIT, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
-func accept(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (fd int, err error) {
-	r0, _, e1 := Syscall(SYS_ACCEPT, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)))
-	fd = int(r0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
diff --git a/src/syscall/zsyscall_linux_arm64.go b/src/syscall/zsyscall_linux_arm64.go
index a1c91071..6625cddb 100644
--- a/src/syscall/zsyscall_linux_arm64.go
+++ b/src/syscall/zsyscall_linux_arm64.go
@@ -1182,16 +1182,6 @@ func Getgid() (gid int) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func getrlimit(resource int, rlim *Rlimit) (err error) {
-	_, _, e1 := RawSyscall(SYS_GETRLIMIT, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func Getuid() (uid int) {
 	r0, _ := rawSyscallNoError(SYS_GETUID, 0, 0, 0)
 	uid = int(r0)
@@ -1306,16 +1296,6 @@ func Setfsuid(uid int) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func setrlimit1(resource int, rlim *Rlimit) (err error) {
-	_, _, e1 := RawSyscall(SYS_SETRLIMIT, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func Shutdown(fd int, how int) (err error) {
 	_, _, e1 := Syscall(SYS_SHUTDOWN, uintptr(fd), uintptr(how), 0)
 	if e1 != 0 {
diff --git a/src/syscall/zsyscall_linux_mips.go b/src/syscall/zsyscall_linux_mips.go
index 7e216b04..0bd4a806 100644
--- a/src/syscall/zsyscall_linux_mips.go
+++ b/src/syscall/zsyscall_linux_mips.go
@@ -1670,23 +1670,3 @@ func mmap2(addr uintptr, length uintptr, prot int, flags int, fd int, pageOffset
 	}
 	return
 }
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
-func getrlimit(resource int, rlim *rlimit32) (err error) {
-	_, _, e1 := RawSyscall(SYS_GETRLIMIT, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
-func setrlimit1(resource int, rlim *rlimit32) (err error) {
-	_, _, e1 := RawSyscall(SYS_SETRLIMIT, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
diff --git a/src/syscall/zsyscall_linux_mips64.go b/src/syscall/zsyscall_linux_mips64.go
index 8c894b10..449088c8 100644
--- a/src/syscall/zsyscall_linux_mips64.go
+++ b/src/syscall/zsyscall_linux_mips64.go
@@ -1116,21 +1116,6 @@ func Fstatfs(fd int, buf *Statfs_t) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func fstatat(dirfd int, path string, stat *Stat_t, flags int) (err error) {
-	var _p0 *byte
-	_p0, err = BytePtrFromString(path)
-	if err != nil {
-		return
-	}
-	_, _, e1 := Syscall6(SYS_NEWFSTATAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(stat)), uintptr(flags), 0, 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func Ftruncate(fd int, length int64) (err error) {
 	_, _, e1 := Syscall(SYS_FTRUNCATE, uintptr(fd), uintptr(length), 0)
 	if e1 != 0 {
@@ -1165,16 +1150,6 @@ func Getgid() (gid int) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Getrlimit(resource int, rlim *Rlimit) (err error) {
-	_, _, e1 := RawSyscall(SYS_GETRLIMIT, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func Getuid() (uid int) {
 	r0, _ := rawSyscallNoError(SYS_GETUID, 0, 0, 0)
 	uid = int(r0)
@@ -1325,16 +1300,6 @@ func Setfsuid(uid int) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func setrlimit(resource int, rlim *Rlimit) (err error) {
-	_, _, e1 := RawSyscall(SYS_SETRLIMIT, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func Shutdown(fd int, how int) (err error) {
 	_, _, e1 := Syscall(SYS_SHUTDOWN, uintptr(fd), uintptr(how), 0)
 	if e1 != 0 {
@@ -1658,6 +1623,21 @@ func utimes(path string, times *[2]Timeval) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func fstatatInternal(dirfd int, path string, stat *stat_t, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall6(SYS_NEWFSTATAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(stat)), uintptr(flags), 0, 0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func fstat(fd int, st *stat_t) (err error) {
 	_, _, e1 := Syscall(SYS_FSTAT, uintptr(fd), uintptr(unsafe.Pointer(st)), 0)
 	if e1 != 0 {
diff --git a/src/syscall/zsyscall_linux_mips64le.go b/src/syscall/zsyscall_linux_mips64le.go
index 812a6ba8..048298a3 100644
--- a/src/syscall/zsyscall_linux_mips64le.go
+++ b/src/syscall/zsyscall_linux_mips64le.go
@@ -1116,21 +1116,6 @@ func Fstatfs(fd int, buf *Statfs_t) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func fstatat(dirfd int, path string, stat *Stat_t, flags int) (err error) {
-	var _p0 *byte
-	_p0, err = BytePtrFromString(path)
-	if err != nil {
-		return
-	}
-	_, _, e1 := Syscall6(SYS_NEWFSTATAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(stat)), uintptr(flags), 0, 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func Ftruncate(fd int, length int64) (err error) {
 	_, _, e1 := Syscall(SYS_FTRUNCATE, uintptr(fd), uintptr(length), 0)
 	if e1 != 0 {
@@ -1165,16 +1150,6 @@ func Getgid() (gid int) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Getrlimit(resource int, rlim *Rlimit) (err error) {
-	_, _, e1 := RawSyscall(SYS_GETRLIMIT, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func Getuid() (uid int) {
 	r0, _ := rawSyscallNoError(SYS_GETUID, 0, 0, 0)
 	uid = int(r0)
@@ -1325,16 +1300,6 @@ func Setfsuid(uid int) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func setrlimit(resource int, rlim *Rlimit) (err error) {
-	_, _, e1 := RawSyscall(SYS_SETRLIMIT, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func Shutdown(fd int, how int) (err error) {
 	_, _, e1 := Syscall(SYS_SHUTDOWN, uintptr(fd), uintptr(how), 0)
 	if e1 != 0 {
@@ -1658,6 +1623,21 @@ func utimes(path string, times *[2]Timeval) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func fstatatInternal(dirfd int, path string, stat *stat_t, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	_, _, e1 := Syscall6(SYS_NEWFSTATAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(stat)), uintptr(flags), 0, 0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func fstat(fd int, st *stat_t) (err error) {
 	_, _, e1 := Syscall(SYS_FSTAT, uintptr(fd), uintptr(unsafe.Pointer(st)), 0)
 	if e1 != 0 {
diff --git a/src/syscall/zsyscall_linux_mipsle.go b/src/syscall/zsyscall_linux_mipsle.go
index d32a8afa..7f880e53 100644
--- a/src/syscall/zsyscall_linux_mipsle.go
+++ b/src/syscall/zsyscall_linux_mipsle.go
@@ -1670,23 +1670,3 @@ func mmap2(addr uintptr, length uintptr, prot int, flags int, fd int, pageOffset
 	}
 	return
 }
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
-func getrlimit(resource int, rlim *rlimit32) (err error) {
-	_, _, e1 := RawSyscall(SYS_GETRLIMIT, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
-func setrlimit1(resource int, rlim *rlimit32) (err error) {
-	_, _, e1 := RawSyscall(SYS_SETRLIMIT, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
diff --git a/src/syscall/zsyscall_linux_ppc64.go b/src/syscall/zsyscall_linux_ppc64.go
index c321267b..c4ca96f2 100644
--- a/src/syscall/zsyscall_linux_ppc64.go
+++ b/src/syscall/zsyscall_linux_ppc64.go
@@ -1192,16 +1192,6 @@ func Getgid() (gid int) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Getrlimit(resource int, rlim *Rlimit) (err error) {
-	_, _, e1 := RawSyscall(SYS_UGETRLIMIT, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func Getuid() (uid int) {
 	r0, _ := rawSyscallNoError(SYS_GETUID, 0, 0, 0)
 	uid = int(r0)
@@ -1398,16 +1388,6 @@ func Setfsuid(uid int) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func setrlimit(resource int, rlim *Rlimit) (err error) {
-	_, _, e1 := RawSyscall(SYS_SETRLIMIT, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func Shutdown(fd int, how int) (err error) {
 	_, _, e1 := Syscall(SYS_SHUTDOWN, uintptr(fd), uintptr(how), 0)
 	if e1 != 0 {
diff --git a/src/syscall/zsyscall_linux_ppc64le.go b/src/syscall/zsyscall_linux_ppc64le.go
index 40475d76..a08471b4 100644
--- a/src/syscall/zsyscall_linux_ppc64le.go
+++ b/src/syscall/zsyscall_linux_ppc64le.go
@@ -1192,16 +1192,6 @@ func Getgid() (gid int) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Getrlimit(resource int, rlim *Rlimit) (err error) {
-	_, _, e1 := RawSyscall(SYS_UGETRLIMIT, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func Getuid() (uid int) {
 	r0, _ := rawSyscallNoError(SYS_GETUID, 0, 0, 0)
 	uid = int(r0)
@@ -1398,16 +1388,6 @@ func Setfsuid(uid int) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func setrlimit(resource int, rlim *Rlimit) (err error) {
-	_, _, e1 := RawSyscall(SYS_SETRLIMIT, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func Shutdown(fd int, how int) (err error) {
 	_, _, e1 := Syscall(SYS_SHUTDOWN, uintptr(fd), uintptr(how), 0)
 	if e1 != 0 {
diff --git a/src/syscall/zsyscall_linux_riscv64.go b/src/syscall/zsyscall_linux_riscv64.go
index dc74acfc..4098b790 100644
--- a/src/syscall/zsyscall_linux_riscv64.go
+++ b/src/syscall/zsyscall_linux_riscv64.go
@@ -1182,16 +1182,6 @@ func Getgid() (gid int) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Getrlimit(resource int, rlim *Rlimit) (err error) {
-	_, _, e1 := RawSyscall(SYS_GETRLIMIT, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func Getuid() (uid int) {
 	r0, _ := rawSyscallNoError(SYS_GETUID, 0, 0, 0)
 	uid = int(r0)
@@ -1306,16 +1296,6 @@ func Setfsuid(uid int) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func setrlimit(resource int, rlim *Rlimit) (err error) {
-	_, _, e1 := RawSyscall(SYS_SETRLIMIT, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func Shutdown(fd int, how int) (err error) {
 	_, _, e1 := Syscall(SYS_SHUTDOWN, uintptr(fd), uintptr(how), 0)
 	if e1 != 0 {
diff --git a/src/syscall/zsyscall_linux_s390x.go b/src/syscall/zsyscall_linux_s390x.go
index cc189d9e..81979169 100644
--- a/src/syscall/zsyscall_linux_s390x.go
+++ b/src/syscall/zsyscall_linux_s390x.go
@@ -1192,16 +1192,6 @@ func Getgid() (gid int) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Getrlimit(resource int, rlim *Rlimit) (err error) {
-	_, _, e1 := RawSyscall(SYS_GETRLIMIT, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func Getuid() (uid int) {
 	r0, _ := rawSyscallNoError(SYS_GETUID, 0, 0, 0)
 	uid = int(r0)
@@ -1368,16 +1358,6 @@ func Setfsuid(uid int) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func setrlimit(resource int, rlim *Rlimit) (err error) {
-	_, _, e1 := RawSyscall(SYS_SETRLIMIT, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int64, err error) {
 	r0, _, e1 := Syscall6(SYS_SPLICE, uintptr(rfd), uintptr(unsafe.Pointer(roff)), uintptr(wfd), uintptr(unsafe.Pointer(woff)), uintptr(len), uintptr(flags))
 	n = int64(r0)
diff --git a/src/syscall/zsyscall_openbsd_386.go b/src/syscall/zsyscall_openbsd_386.go
index d2bd3ea0..c8cf7f23 100644
--- a/src/syscall/zsyscall_openbsd_386.go
+++ b/src/syscall/zsyscall_openbsd_386.go
@@ -1854,26 +1854,6 @@ func libc_ptrace_trampoline()
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func getentropy(p []byte) (err error) {
-	var _p0 unsafe.Pointer
-	if len(p) > 0 {
-		_p0 = unsafe.Pointer(&p[0])
-	} else {
-		_p0 = unsafe.Pointer(&_zero)
-	}
-	_, _, e1 := rawSyscall(abi.FuncPCABI0(libc_getentropy_trampoline), uintptr(_p0), uintptr(len(p)), 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
-
-func libc_getentropy_trampoline()
-
-//go:cgo_import_dynamic libc_getentropy getentropy "libc.so"
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func fstatat(fd int, path string, stat *Stat_t, flags int) (err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)
diff --git a/src/syscall/zsyscall_openbsd_386.s b/src/syscall/zsyscall_openbsd_386.s
index 9a820e9f..f86ac2c0 100644
--- a/src/syscall/zsyscall_openbsd_386.s
+++ b/src/syscall/zsyscall_openbsd_386.s
@@ -227,8 +227,6 @@ TEXT ·libc_exit_trampoline(SB),NOSPLIT,$0-0
 	JMP	libc_exit(SB)
 TEXT ·libc_ptrace_trampoline(SB),NOSPLIT,$0-0
 	JMP	libc_ptrace(SB)
-TEXT ·libc_getentropy_trampoline(SB),NOSPLIT,$0-0
-	JMP	libc_getentropy(SB)
 TEXT ·libc_fstatat_trampoline(SB),NOSPLIT,$0-0
 	JMP	libc_fstatat(SB)
 TEXT ·libc_unlinkat_trampoline(SB),NOSPLIT,$0-0
diff --git a/src/syscall/zsyscall_openbsd_amd64.go b/src/syscall/zsyscall_openbsd_amd64.go
index 170a74b4..9188756a 100644
--- a/src/syscall/zsyscall_openbsd_amd64.go
+++ b/src/syscall/zsyscall_openbsd_amd64.go
@@ -1854,26 +1854,6 @@ func libc_ptrace_trampoline()
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func getentropy(p []byte) (err error) {
-	var _p0 unsafe.Pointer
-	if len(p) > 0 {
-		_p0 = unsafe.Pointer(&p[0])
-	} else {
-		_p0 = unsafe.Pointer(&_zero)
-	}
-	_, _, e1 := rawSyscall(abi.FuncPCABI0(libc_getentropy_trampoline), uintptr(_p0), uintptr(len(p)), 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
-
-func libc_getentropy_trampoline()
-
-//go:cgo_import_dynamic libc_getentropy getentropy "libc.so"
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func fstatat(fd int, path string, stat *Stat_t, flags int) (err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)
diff --git a/src/syscall/zsyscall_openbsd_amd64.s b/src/syscall/zsyscall_openbsd_amd64.s
index 9b70dc09..4ec62202 100644
--- a/src/syscall/zsyscall_openbsd_amd64.s
+++ b/src/syscall/zsyscall_openbsd_amd64.s
@@ -227,8 +227,6 @@ TEXT ·libc_exit_trampoline(SB),NOSPLIT,$0-0
 	JMP	libc_exit(SB)
 TEXT ·libc_ptrace_trampoline(SB),NOSPLIT,$0-0
 	JMP	libc_ptrace(SB)
-TEXT ·libc_getentropy_trampoline(SB),NOSPLIT,$0-0
-	JMP	libc_getentropy(SB)
 TEXT ·libc_fstatat_trampoline(SB),NOSPLIT,$0-0
 	JMP	libc_fstatat(SB)
 TEXT ·libc_unlinkat_trampoline(SB),NOSPLIT,$0-0
diff --git a/src/syscall/zsyscall_openbsd_arm.go b/src/syscall/zsyscall_openbsd_arm.go
index e75bd0b4..ecdfa636 100644
--- a/src/syscall/zsyscall_openbsd_arm.go
+++ b/src/syscall/zsyscall_openbsd_arm.go
@@ -1854,26 +1854,6 @@ func libc_ptrace_trampoline()
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func getentropy(p []byte) (err error) {
-	var _p0 unsafe.Pointer
-	if len(p) > 0 {
-		_p0 = unsafe.Pointer(&p[0])
-	} else {
-		_p0 = unsafe.Pointer(&_zero)
-	}
-	_, _, e1 := rawSyscall(abi.FuncPCABI0(libc_getentropy_trampoline), uintptr(_p0), uintptr(len(p)), 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
-
-func libc_getentropy_trampoline()
-
-//go:cgo_import_dynamic libc_getentropy getentropy "libc.so"
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func fstatat(fd int, path string, stat *Stat_t, flags int) (err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)
diff --git a/src/syscall/zsyscall_openbsd_arm.s b/src/syscall/zsyscall_openbsd_arm.s
index 0333377b..75251d03 100644
--- a/src/syscall/zsyscall_openbsd_arm.s
+++ b/src/syscall/zsyscall_openbsd_arm.s
@@ -227,8 +227,6 @@ TEXT ·libc_exit_trampoline(SB),NOSPLIT,$0-0
 	JMP	libc_exit(SB)
 TEXT ·libc_ptrace_trampoline(SB),NOSPLIT,$0-0
 	JMP	libc_ptrace(SB)
-TEXT ·libc_getentropy_trampoline(SB),NOSPLIT,$0-0
-	JMP	libc_getentropy(SB)
 TEXT ·libc_fstatat_trampoline(SB),NOSPLIT,$0-0
 	JMP	libc_fstatat(SB)
 TEXT ·libc_unlinkat_trampoline(SB),NOSPLIT,$0-0
diff --git a/src/syscall/zsyscall_openbsd_arm64.go b/src/syscall/zsyscall_openbsd_arm64.go
index bc027b44..d28d3c5e 100644
--- a/src/syscall/zsyscall_openbsd_arm64.go
+++ b/src/syscall/zsyscall_openbsd_arm64.go
@@ -1854,26 +1854,6 @@ func libc_ptrace_trampoline()
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func getentropy(p []byte) (err error) {
-	var _p0 unsafe.Pointer
-	if len(p) > 0 {
-		_p0 = unsafe.Pointer(&p[0])
-	} else {
-		_p0 = unsafe.Pointer(&_zero)
-	}
-	_, _, e1 := rawSyscall(abi.FuncPCABI0(libc_getentropy_trampoline), uintptr(_p0), uintptr(len(p)), 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
-
-func libc_getentropy_trampoline()
-
-//go:cgo_import_dynamic libc_getentropy getentropy "libc.so"
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func fstatat(fd int, path string, stat *Stat_t, flags int) (err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)
diff --git a/src/syscall/zsyscall_openbsd_arm64.s b/src/syscall/zsyscall_openbsd_arm64.s
index 654e6c69..deea88ec 100644
--- a/src/syscall/zsyscall_openbsd_arm64.s
+++ b/src/syscall/zsyscall_openbsd_arm64.s
@@ -227,8 +227,6 @@ TEXT ·libc_exit_trampoline(SB),NOSPLIT,$0-0
 	JMP	libc_exit(SB)
 TEXT ·libc_ptrace_trampoline(SB),NOSPLIT,$0-0
 	JMP	libc_ptrace(SB)
-TEXT ·libc_getentropy_trampoline(SB),NOSPLIT,$0-0
-	JMP	libc_getentropy(SB)
 TEXT ·libc_fstatat_trampoline(SB),NOSPLIT,$0-0
 	JMP	libc_fstatat(SB)
 TEXT ·libc_unlinkat_trampoline(SB),NOSPLIT,$0-0
diff --git a/src/syscall/zsyscall_openbsd_ppc64.go b/src/syscall/zsyscall_openbsd_ppc64.go
index 6808092a..0e6828bc 100644
--- a/src/syscall/zsyscall_openbsd_ppc64.go
+++ b/src/syscall/zsyscall_openbsd_ppc64.go
@@ -1854,26 +1854,6 @@ func libc_ptrace_trampoline()
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func getentropy(p []byte) (err error) {
-	var _p0 unsafe.Pointer
-	if len(p) > 0 {
-		_p0 = unsafe.Pointer(&p[0])
-	} else {
-		_p0 = unsafe.Pointer(&_zero)
-	}
-	_, _, e1 := rawSyscall(abi.FuncPCABI0(libc_getentropy_trampoline), uintptr(_p0), uintptr(len(p)), 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
-
-func libc_getentropy_trampoline()
-
-//go:cgo_import_dynamic libc_getentropy getentropy "libc.so"
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func fstatat(fd int, path string, stat *Stat_t, flags int) (err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)
diff --git a/src/syscall/zsyscall_openbsd_ppc64.s b/src/syscall/zsyscall_openbsd_ppc64.s
index 86a5745c..cc4eb952 100644
--- a/src/syscall/zsyscall_openbsd_ppc64.s
+++ b/src/syscall/zsyscall_openbsd_ppc64.s
@@ -340,9 +340,6 @@ TEXT ·libc_exit_trampoline(SB),NOSPLIT,$0-0
 TEXT ·libc_ptrace_trampoline(SB),NOSPLIT,$0-0
 	CALL	libc_ptrace(SB)
 	RET
-TEXT ·libc_getentropy_trampoline(SB),NOSPLIT,$0-0
-	CALL	libc_getentropy(SB)
-	RET
 TEXT ·libc_fstatat_trampoline(SB),NOSPLIT,$0-0
 	CALL	libc_fstatat(SB)
 	RET
diff --git a/src/syscall/zsyscall_openbsd_riscv64.go b/src/syscall/zsyscall_openbsd_riscv64.go
index 2979ff78..92014707 100644
--- a/src/syscall/zsyscall_openbsd_riscv64.go
+++ b/src/syscall/zsyscall_openbsd_riscv64.go
@@ -1854,26 +1854,6 @@ func libc_ptrace_trampoline()
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func getentropy(p []byte) (err error) {
-	var _p0 unsafe.Pointer
-	if len(p) > 0 {
-		_p0 = unsafe.Pointer(&p[0])
-	} else {
-		_p0 = unsafe.Pointer(&_zero)
-	}
-	_, _, e1 := rawSyscall(abi.FuncPCABI0(libc_getentropy_trampoline), uintptr(_p0), uintptr(len(p)), 0)
-	if e1 != 0 {
-		err = errnoErr(e1)
-	}
-	return
-}
-
-func libc_getentropy_trampoline()
-
-//go:cgo_import_dynamic libc_getentropy getentropy "libc.so"
-
-// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-
 func fstatat(fd int, path string, stat *Stat_t, flags int) (err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)
diff --git a/src/syscall/zsyscall_openbsd_riscv64.s b/src/syscall/zsyscall_openbsd_riscv64.s
index c8728190..14b7b232 100644
--- a/src/syscall/zsyscall_openbsd_riscv64.s
+++ b/src/syscall/zsyscall_openbsd_riscv64.s
@@ -227,8 +227,6 @@ TEXT ·libc_exit_trampoline(SB),NOSPLIT,$0-0
 	JMP	libc_exit(SB)
 TEXT ·libc_ptrace_trampoline(SB),NOSPLIT,$0-0
 	JMP	libc_ptrace(SB)
-TEXT ·libc_getentropy_trampoline(SB),NOSPLIT,$0-0
-	JMP	libc_getentropy(SB)
 TEXT ·libc_fstatat_trampoline(SB),NOSPLIT,$0-0
 	JMP	libc_fstatat(SB)
 TEXT ·libc_unlinkat_trampoline(SB),NOSPLIT,$0-0
diff --git a/src/syscall/zsyscall_windows.go b/src/syscall/zsyscall_windows.go
index a47b0900..e58a384a 100644
--- a/src/syscall/zsyscall_windows.go
+++ b/src/syscall/zsyscall_windows.go
@@ -152,6 +152,7 @@ var (
 	procSetEnvironmentVariableW            = modkernel32.NewProc("SetEnvironmentVariableW")
 	procSetFileAttributesW                 = modkernel32.NewProc("SetFileAttributesW")
 	procSetFileCompletionNotificationModes = modkernel32.NewProc("SetFileCompletionNotificationModes")
+	procSetFileInformationByHandle         = modkernel32.NewProc("SetFileInformationByHandle")
 	procSetFilePointer                     = modkernel32.NewProc("SetFilePointer")
 	procSetFileTime                        = modkernel32.NewProc("SetFileTime")
 	procSetHandleInformation               = modkernel32.NewProc("SetHandleInformation")
@@ -1083,6 +1084,14 @@ func SetFileCompletionNotificationModes(handle Handle, flags uint8) (err error)
 	return
 }
 
+func setFileInformationByHandle(handle Handle, fileInformationClass uint32, buf unsafe.Pointer, bufsize uint32) (err error) {
+	r1, _, e1 := Syscall6(procSetFileInformationByHandle.Addr(), 4, uintptr(handle), uintptr(fileInformationClass), uintptr(buf), uintptr(bufsize), 0, 0)
+	if r1 == 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
 func SetFilePointer(handle Handle, lowoffset int32, highoffsetptr *int32, whence uint32) (newlowoffset uint32, err error) {
 	r0, _, e1 := Syscall6(procSetFilePointer.Addr(), 4, uintptr(handle), uintptr(lowoffset), uintptr(unsafe.Pointer(highoffsetptr)), uintptr(whence), 0, 0)
 	newlowoffset = uint32(r0)
diff --git a/src/syscall/zsysnum_darwin_amd64.go b/src/syscall/zsysnum_darwin_amd64.go
index 08e003f2..dcff3ca8 100644
--- a/src/syscall/zsysnum_darwin_amd64.go
+++ b/src/syscall/zsysnum_darwin_amd64.go
@@ -1,8 +1,6 @@
 // mksysnum_darwin.pl /usr/include/sys/syscall.h
 // Code generated by the command above; DO NOT EDIT.
 
-//go:build amd64 && darwin
-
 package syscall
 
 const (
diff --git a/src/syscall/zsysnum_darwin_arm64.go b/src/syscall/zsysnum_darwin_arm64.go
index 71309bb4..d023dc3e 100644
--- a/src/syscall/zsysnum_darwin_arm64.go
+++ b/src/syscall/zsysnum_darwin_arm64.go
@@ -1,8 +1,6 @@
 // mksysnum_darwin.pl /usr/include/sys/syscall.h
 // Code generated by the command above; DO NOT EDIT.
 
-//go:build arm64 && darwin
-
 package syscall
 
 const (
diff --git a/src/syscall/zsysnum_dragonfly_amd64.go b/src/syscall/zsysnum_dragonfly_amd64.go
index 03d4b06a..b9fb1c08 100644
--- a/src/syscall/zsysnum_dragonfly_amd64.go
+++ b/src/syscall/zsysnum_dragonfly_amd64.go
@@ -1,8 +1,6 @@
 // mksysnum_dragonfly.pl
 // Code generated by the command above; DO NOT EDIT.
 
-//go:build amd64 && dragonfly
-
 package syscall
 
 const (
diff --git a/src/syscall/zsysnum_freebsd_386.go b/src/syscall/zsysnum_freebsd_386.go
index ada885e4..348bcd01 100644
--- a/src/syscall/zsysnum_freebsd_386.go
+++ b/src/syscall/zsysnum_freebsd_386.go
@@ -1,8 +1,6 @@
 // mksysnum_freebsd.pl
 // Code generated by the command above; DO NOT EDIT.
 
-//go:build 386 && freebsd
-
 package syscall
 
 const (
diff --git a/src/syscall/zsysnum_freebsd_amd64.go b/src/syscall/zsysnum_freebsd_amd64.go
index 85a50ad9..348bcd01 100644
--- a/src/syscall/zsysnum_freebsd_amd64.go
+++ b/src/syscall/zsysnum_freebsd_amd64.go
@@ -1,8 +1,6 @@
 // mksysnum_freebsd.pl
 // Code generated by the command above; DO NOT EDIT.
 
-//go:build amd64 && freebsd
-
 package syscall
 
 const (
diff --git a/src/syscall/zsysnum_freebsd_arm.go b/src/syscall/zsysnum_freebsd_arm.go
index 7f6e3fc3..348bcd01 100644
--- a/src/syscall/zsysnum_freebsd_arm.go
+++ b/src/syscall/zsysnum_freebsd_arm.go
@@ -1,8 +1,6 @@
 // mksysnum_freebsd.pl
 // Code generated by the command above; DO NOT EDIT.
 
-//go:build arm && freebsd
-
 package syscall
 
 const (
diff --git a/src/syscall/zsysnum_freebsd_arm64.go b/src/syscall/zsysnum_freebsd_arm64.go
index bde0f3bc..43870907 100644
--- a/src/syscall/zsysnum_freebsd_arm64.go
+++ b/src/syscall/zsysnum_freebsd_arm64.go
@@ -1,8 +1,6 @@
 // mksysnum_freebsd.pl
 // Code generated by the command above; DO NOT EDIT.
 
-//go:build arm64 && freebsd
-
 package syscall
 
 const (
diff --git a/src/syscall/zsysnum_freebsd_riscv64.go b/src/syscall/zsysnum_freebsd_riscv64.go
index 48e70296..43870907 100644
--- a/src/syscall/zsysnum_freebsd_riscv64.go
+++ b/src/syscall/zsysnum_freebsd_riscv64.go
@@ -1,8 +1,6 @@
 // mksysnum_freebsd.pl
 // Code generated by the command above; DO NOT EDIT.
 
-//go:build riscv64 && freebsd
-
 package syscall
 
 const (
diff --git a/src/syscall/zsysnum_linux_386.go b/src/syscall/zsysnum_linux_386.go
index 4966d2a9..e5e474fb 100644
--- a/src/syscall/zsysnum_linux_386.go
+++ b/src/syscall/zsysnum_linux_386.go
@@ -1,8 +1,6 @@
 // mksysnum_linux.pl /usr/include/asm/unistd_32.h
 // Code generated by the command above; DO NOT EDIT.
 
-//go:build 386 && linux
-
 package syscall
 
 const (
diff --git a/src/syscall/zsysnum_linux_amd64.go b/src/syscall/zsysnum_linux_amd64.go
index 576c7c36..2a78e3a0 100644
--- a/src/syscall/zsysnum_linux_amd64.go
+++ b/src/syscall/zsysnum_linux_amd64.go
@@ -1,8 +1,6 @@
 // mksysnum_linux.pl /usr/include/asm/unistd_64.h
 // Code generated by the command above; DO NOT EDIT.
 
-//go:build amd64 && linux
-
 package syscall
 
 const (
diff --git a/src/syscall/zsysnum_linux_arm.go b/src/syscall/zsysnum_linux_arm.go
index b0da97c6..58e3a781 100644
--- a/src/syscall/zsysnum_linux_arm.go
+++ b/src/syscall/zsysnum_linux_arm.go
@@ -1,8 +1,6 @@
 // mksysnum_linux.pl
 // Code generated by the command above; DO NOT EDIT.
 
-//go:build arm && linux
-
 package syscall
 
 const (
diff --git a/src/syscall/zsysnum_linux_arm64.go b/src/syscall/zsysnum_linux_arm64.go
index 0136d944..0ccb57aa 100644
--- a/src/syscall/zsysnum_linux_arm64.go
+++ b/src/syscall/zsysnum_linux_arm64.go
@@ -1,8 +1,6 @@
 // mksysnum_linux.pl /usr/include/asm-generic/unistd.h
 // Code generated by the command above; DO NOT EDIT.
 
-//go:build arm64 && linux
-
 package syscall
 
 const (
diff --git a/src/syscall/zsysnum_linux_ppc64.go b/src/syscall/zsysnum_linux_ppc64.go
index cc964c23..c2e058b2 100644
--- a/src/syscall/zsysnum_linux_ppc64.go
+++ b/src/syscall/zsysnum_linux_ppc64.go
@@ -1,8 +1,6 @@
 // mksysnum_linux.pl /usr/include/asm/unistd.h
 // Code generated by the command above; DO NOT EDIT.
 
-//go:build ppc64 && linux
-
 package syscall
 
 const (
diff --git a/src/syscall/zsysnum_linux_ppc64le.go b/src/syscall/zsysnum_linux_ppc64le.go
index 57bfb779..0c8de627 100644
--- a/src/syscall/zsysnum_linux_ppc64le.go
+++ b/src/syscall/zsysnum_linux_ppc64le.go
@@ -1,8 +1,6 @@
 // mksysnum_linux.pl /usr/include/powerpc64le-linux-gnu/asm/unistd.h
 // Code generated by the command above; DO NOT EDIT.
 
-//go:build ppc64le && linux
-
 package syscall
 
 const (
diff --git a/src/syscall/zsysnum_netbsd_386.go b/src/syscall/zsysnum_netbsd_386.go
index 5696c4be..c28d0b4e 100644
--- a/src/syscall/zsysnum_netbsd_386.go
+++ b/src/syscall/zsysnum_netbsd_386.go
@@ -1,8 +1,6 @@
 // mksysnum_netbsd.pl
 // Code generated by the command above; DO NOT EDIT.
 
-//go:build 386 && netbsd
-
 package syscall
 
 const (
diff --git a/src/syscall/zsysnum_netbsd_amd64.go b/src/syscall/zsysnum_netbsd_amd64.go
index 9fb85cdd..c28d0b4e 100644
--- a/src/syscall/zsysnum_netbsd_amd64.go
+++ b/src/syscall/zsysnum_netbsd_amd64.go
@@ -1,8 +1,6 @@
 // mksysnum_netbsd.pl
 // Code generated by the command above; DO NOT EDIT.
 
-//go:build amd64 && netbsd
-
 package syscall
 
 const (
diff --git a/src/syscall/zsysnum_netbsd_arm.go b/src/syscall/zsysnum_netbsd_arm.go
index e0e89946..c28d0b4e 100644
--- a/src/syscall/zsysnum_netbsd_arm.go
+++ b/src/syscall/zsysnum_netbsd_arm.go
@@ -1,8 +1,6 @@
 // mksysnum_netbsd.pl
 // Code generated by the command above; DO NOT EDIT.
 
-//go:build arm && netbsd
-
 package syscall
 
 const (
diff --git a/src/syscall/zsysnum_netbsd_arm64.go b/src/syscall/zsysnum_netbsd_arm64.go
index 9653364d..c28d0b4e 100644
--- a/src/syscall/zsysnum_netbsd_arm64.go
+++ b/src/syscall/zsysnum_netbsd_arm64.go
@@ -1,8 +1,6 @@
 // mksysnum_netbsd.pl
 // Code generated by the command above; DO NOT EDIT.
 
-//go:build arm64 && netbsd
-
 package syscall
 
 const (
diff --git a/src/syscall/zsysnum_openbsd_386.go b/src/syscall/zsysnum_openbsd_386.go
index 3b12639b..622efe19 100644
--- a/src/syscall/zsysnum_openbsd_386.go
+++ b/src/syscall/zsysnum_openbsd_386.go
@@ -1,8 +1,6 @@
 // mksysnum_openbsd.pl
 // Code generated by the command above; DO NOT EDIT.
 
-//go:build 386 && openbsd
-
 package syscall
 
 const (
diff --git a/src/syscall/zsysnum_openbsd_amd64.go b/src/syscall/zsysnum_openbsd_amd64.go
index bce309dc..22d2ce38 100644
--- a/src/syscall/zsysnum_openbsd_amd64.go
+++ b/src/syscall/zsysnum_openbsd_amd64.go
@@ -1,8 +1,6 @@
 // mksysnum_openbsd.pl
 // Code generated by the command above; DO NOT EDIT.
 
-//go:build amd64 && openbsd
-
 package syscall
 
 const (
diff --git a/src/syscall/zsysnum_openbsd_arm.go b/src/syscall/zsysnum_openbsd_arm.go
index 05aed707..80051fdf 100644
--- a/src/syscall/zsysnum_openbsd_arm.go
+++ b/src/syscall/zsysnum_openbsd_arm.go
@@ -1,8 +1,6 @@
 // mksysnum_openbsd.pl
 // Code generated by the command above; DO NOT EDIT.
 
-//go:build arm && openbsd
-
 package syscall
 
 const (
diff --git a/src/syscall/zsysnum_solaris_amd64.go b/src/syscall/zsysnum_solaris_amd64.go
index ea244e53..43b3d8b4 100644
--- a/src/syscall/zsysnum_solaris_amd64.go
+++ b/src/syscall/zsysnum_solaris_amd64.go
@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build amd64 && solaris
-
 package syscall
 
 // TODO(aram): remove these before Go 1.3.
diff --git a/src/syscall/ztypes_darwin_amd64.go b/src/syscall/ztypes_darwin_amd64.go
index 551edc70..8b05961b 100644
--- a/src/syscall/ztypes_darwin_amd64.go
+++ b/src/syscall/ztypes_darwin_amd64.go
@@ -1,7 +1,5 @@
-// Created by cgo -godefs - DO NOT EDIT
-// cgo -godefs types_darwin.go
-
-//go:build amd64 && darwin
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
+// cgo -godefs types_darwin.go | go run mkpost.go
 
 package syscall
 
diff --git a/src/syscall/ztypes_darwin_arm64.go b/src/syscall/ztypes_darwin_arm64.go
index 46f78a97..8b05961b 100644
--- a/src/syscall/ztypes_darwin_arm64.go
+++ b/src/syscall/ztypes_darwin_arm64.go
@@ -1,7 +1,5 @@
-// Created by cgo -godefs - DO NOT EDIT
-// cgo -godefs types_darwin.go
-
-//go:build arm64 && darwin
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
+// cgo -godefs types_darwin.go | go run mkpost.go
 
 package syscall
 
diff --git a/src/syscall/ztypes_dragonfly_amd64.go b/src/syscall/ztypes_dragonfly_amd64.go
index ec519b72..eae8221e 100644
--- a/src/syscall/ztypes_dragonfly_amd64.go
+++ b/src/syscall/ztypes_dragonfly_amd64.go
@@ -1,7 +1,5 @@
-// Created by cgo -godefs - DO NOT EDIT
-// cgo -godefs types_dragonfly.go
-
-//go:build amd64 && dragonfly
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
+// cgo -godefs types_dragonfly.go | go run mkpost.go
 
 package syscall
 
diff --git a/src/syscall/ztypes_freebsd_386.go b/src/syscall/ztypes_freebsd_386.go
index 70ae808e..bbb222e0 100644
--- a/src/syscall/ztypes_freebsd_386.go
+++ b/src/syscall/ztypes_freebsd_386.go
@@ -1,8 +1,6 @@
 // Code generated by cmd/cgo -godefs; DO NOT EDIT.
 // cgo -godefs types_freebsd.go | go run mkpost.go
 
-//go:build 386 && freebsd
-
 package syscall
 
 const (
diff --git a/src/syscall/ztypes_freebsd_amd64.go b/src/syscall/ztypes_freebsd_amd64.go
index 050432a6..3f97d1e4 100644
--- a/src/syscall/ztypes_freebsd_amd64.go
+++ b/src/syscall/ztypes_freebsd_amd64.go
@@ -1,8 +1,6 @@
 // Code generated by cmd/cgo -godefs; DO NOT EDIT.
 // cgo -godefs types_freebsd.go | go run mkpost.go
 
-//go:build amd64 && freebsd
-
 package syscall
 
 const (
diff --git a/src/syscall/ztypes_freebsd_arm.go b/src/syscall/ztypes_freebsd_arm.go
index ae5ed56c..f6b1ae4e 100644
--- a/src/syscall/ztypes_freebsd_arm.go
+++ b/src/syscall/ztypes_freebsd_arm.go
@@ -1,8 +1,6 @@
 // Code generated by cmd/cgo -godefs; DO NOT EDIT.
 // cgo -godefs -- -fsigned-char types_freebsd.go
 
-//go:build arm && freebsd
-
 package syscall
 
 const (
diff --git a/src/syscall/ztypes_freebsd_arm64.go b/src/syscall/ztypes_freebsd_arm64.go
index b3ab991f..3f97d1e4 100644
--- a/src/syscall/ztypes_freebsd_arm64.go
+++ b/src/syscall/ztypes_freebsd_arm64.go
@@ -1,8 +1,6 @@
 // Code generated by cmd/cgo -godefs; DO NOT EDIT.
 // cgo -godefs types_freebsd.go | go run mkpost.go
 
-//go:build arm64 && freebsd
-
 package syscall
 
 const (
diff --git a/src/syscall/ztypes_freebsd_riscv64.go b/src/syscall/ztypes_freebsd_riscv64.go
index 28895184..3f97d1e4 100644
--- a/src/syscall/ztypes_freebsd_riscv64.go
+++ b/src/syscall/ztypes_freebsd_riscv64.go
@@ -1,8 +1,6 @@
 // Code generated by cmd/cgo -godefs; DO NOT EDIT.
 // cgo -godefs types_freebsd.go | go run mkpost.go
 
-//go:build riscv64 && freebsd
-
 package syscall
 
 const (
diff --git a/src/syscall/ztypes_linux_386.go b/src/syscall/ztypes_linux_386.go
index 79a46a4a..3a3dfc1b 100644
--- a/src/syscall/ztypes_linux_386.go
+++ b/src/syscall/ztypes_linux_386.go
@@ -1,7 +1,5 @@
-// Created by cgo -godefs - DO NOT EDIT
-// cgo -godefs types_linux.go
-
-//go:build 386 && linux
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
+// cgo -godefs types_linux.go | go run mkpost.go
 
 package syscall
 
diff --git a/src/syscall/ztypes_linux_amd64.go b/src/syscall/ztypes_linux_amd64.go
index 3d223fe2..a3831c1e 100644
--- a/src/syscall/ztypes_linux_amd64.go
+++ b/src/syscall/ztypes_linux_amd64.go
@@ -1,7 +1,5 @@
-// Created by cgo -godefs - DO NOT EDIT
-// cgo -godefs types_linux.go
-
-//go:build amd64 && linux
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
+// cgo -godefs types_linux.go | go run mkpost.go
 
 package syscall
 
diff --git a/src/syscall/ztypes_linux_arm.go b/src/syscall/ztypes_linux_arm.go
index 9db1142c..f29c8733 100644
--- a/src/syscall/ztypes_linux_arm.go
+++ b/src/syscall/ztypes_linux_arm.go
@@ -1,7 +1,5 @@
-// Created by cgo -godefs - DO NOT EDIT
-// cgo -godefs types_linux.go
-
-//go:build arm && linux
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
+// cgo -godefs types_linux.go | go run mkpost.go
 
 package syscall
 
diff --git a/src/syscall/ztypes_linux_arm64.go b/src/syscall/ztypes_linux_arm64.go
index 996950f4..05a750bc 100644
--- a/src/syscall/ztypes_linux_arm64.go
+++ b/src/syscall/ztypes_linux_arm64.go
@@ -1,7 +1,5 @@
-// Created by cgo -godefs - DO NOT EDIT
-// cgo -godefs -- -fsigned-char types_linux.go
-
-//go:build arm64 && linux
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
+// cgo -godefs types_linux.go | go run mkpost.go
 
 package syscall
 
diff --git a/src/syscall/ztypes_linux_mips.go b/src/syscall/ztypes_linux_mips.go
index 4ce84978..dac89f4f 100644
--- a/src/syscall/ztypes_linux_mips.go
+++ b/src/syscall/ztypes_linux_mips.go
@@ -1,5 +1,5 @@
-// Created by cgo -godefs - DO NOT EDIT
-// cgo -godefs types_linux.go
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
+// cgo -godefs types_linux.go | go run mkpost.go
 
 package syscall
 
diff --git a/src/syscall/ztypes_linux_mips64.go b/src/syscall/ztypes_linux_mips64.go
index de39e732..b7e55901 100644
--- a/src/syscall/ztypes_linux_mips64.go
+++ b/src/syscall/ztypes_linux_mips64.go
@@ -1,5 +1,5 @@
-// Created by cgo -godefs - DO NOT EDIT
-// cgo -godefs types_linux.go
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
+// cgo -godefs types_linux.go | go run mkpost.go
 
 package syscall
 
diff --git a/src/syscall/ztypes_linux_mips64le.go b/src/syscall/ztypes_linux_mips64le.go
index de39e732..b7e55901 100644
--- a/src/syscall/ztypes_linux_mips64le.go
+++ b/src/syscall/ztypes_linux_mips64le.go
@@ -1,5 +1,5 @@
-// Created by cgo -godefs - DO NOT EDIT
-// cgo -godefs types_linux.go
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
+// cgo -godefs types_linux.go | go run mkpost.go
 
 package syscall
 
diff --git a/src/syscall/ztypes_linux_mipsle.go b/src/syscall/ztypes_linux_mipsle.go
index 4ce84978..dac89f4f 100644
--- a/src/syscall/ztypes_linux_mipsle.go
+++ b/src/syscall/ztypes_linux_mipsle.go
@@ -1,5 +1,5 @@
-// Created by cgo -godefs - DO NOT EDIT
-// cgo -godefs types_linux.go
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
+// cgo -godefs types_linux.go | go run mkpost.go
 
 package syscall
 
diff --git a/src/syscall/ztypes_linux_ppc64.go b/src/syscall/ztypes_linux_ppc64.go
index 717e2734..74e1435e 100644
--- a/src/syscall/ztypes_linux_ppc64.go
+++ b/src/syscall/ztypes_linux_ppc64.go
@@ -1,7 +1,5 @@
-// Created by cgo -godefs - DO NOT EDIT
-// cgo -godefs types_linux.go
-
-//go:build ppc64 && linux
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
+// cgo -godefs types_linux.go | go run mkpost.go
 
 package syscall
 
diff --git a/src/syscall/ztypes_linux_ppc64le.go b/src/syscall/ztypes_linux_ppc64le.go
index 177c1f1e..5828e9b1 100644
--- a/src/syscall/ztypes_linux_ppc64le.go
+++ b/src/syscall/ztypes_linux_ppc64le.go
@@ -1,7 +1,5 @@
-// Created by cgo -godefs - DO NOT EDIT
-// cgo -godefs types_linux.go
-
-//go:build ppc64le && linux
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
+// cgo -godefs types_linux.go | go run mkpost.go
 
 package syscall
 
diff --git a/src/syscall/ztypes_linux_riscv64.go b/src/syscall/ztypes_linux_riscv64.go
index a6c4d788..1827e5df 100644
--- a/src/syscall/ztypes_linux_riscv64.go
+++ b/src/syscall/ztypes_linux_riscv64.go
@@ -1,5 +1,5 @@
-// Created by cgo -godefs - DO NOT EDIT
-// cgo -godefs types_linux.go
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
+// cgo -godefs types_linux.go | go run mkpost.go
 
 package syscall
 
diff --git a/src/syscall/ztypes_linux_s390x.go b/src/syscall/ztypes_linux_s390x.go
index 5c5a7146..df3414db 100644
--- a/src/syscall/ztypes_linux_s390x.go
+++ b/src/syscall/ztypes_linux_s390x.go
@@ -1,4 +1,4 @@
-// Created by cgo -godefs - DO NOT EDIT
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
 // cgo -godefs types_linux.go | go run mkpost.go
 
 package syscall
diff --git a/src/syscall/ztypes_netbsd_386.go b/src/syscall/ztypes_netbsd_386.go
index 74eaa4a1..b0e76adb 100644
--- a/src/syscall/ztypes_netbsd_386.go
+++ b/src/syscall/ztypes_netbsd_386.go
@@ -1,7 +1,5 @@
-// Created by cgo -godefs - DO NOT EDIT
-// cgo -godefs types_netbsd.go
-
-//go:build 386 && netbsd
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
+// cgo -godefs types_netbsd.go | go run mkpost.go
 
 package syscall
 
diff --git a/src/syscall/ztypes_netbsd_amd64.go b/src/syscall/ztypes_netbsd_amd64.go
index fc28fc9b..68256233 100644
--- a/src/syscall/ztypes_netbsd_amd64.go
+++ b/src/syscall/ztypes_netbsd_amd64.go
@@ -1,7 +1,5 @@
-// Created by cgo -godefs - DO NOT EDIT
-// cgo -godefs types_netbsd.go
-
-//go:build amd64 && netbsd
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
+// cgo -godefs types_netbsd.go | go run mkpost.go
 
 package syscall
 
diff --git a/src/syscall/ztypes_netbsd_arm.go b/src/syscall/ztypes_netbsd_arm.go
index 1f885048..99ff41e0 100644
--- a/src/syscall/ztypes_netbsd_arm.go
+++ b/src/syscall/ztypes_netbsd_arm.go
@@ -1,7 +1,5 @@
-// Created by cgo -godefs - DO NOT EDIT
-// cgo -godefs types_netbsd.go
-
-//go:build arm && netbsd
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
+// cgo -godefs types_netbsd.go | go run mkpost.go
 
 package syscall
 
diff --git a/src/syscall/ztypes_netbsd_arm64.go b/src/syscall/ztypes_netbsd_arm64.go
index cac74693..68256233 100644
--- a/src/syscall/ztypes_netbsd_arm64.go
+++ b/src/syscall/ztypes_netbsd_arm64.go
@@ -1,7 +1,5 @@
-// Created by cgo -godefs - DO NOT EDIT
-// cgo -godefs types_netbsd.go
-
-//go:build arm64 && netbsd
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
+// cgo -godefs types_netbsd.go | go run mkpost.go
 
 package syscall
 
diff --git a/src/syscall/ztypes_openbsd_386.go b/src/syscall/ztypes_openbsd_386.go
index f9ba685e..8dfa22c2 100644
--- a/src/syscall/ztypes_openbsd_386.go
+++ b/src/syscall/ztypes_openbsd_386.go
@@ -1,7 +1,5 @@
-// Created by cgo -godefs - DO NOT EDIT
-// cgo -godefs types_openbsd.go
-
-//go:build 386 && openbsd
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
+// cgo -godefs types_openbsd.go | go run mkpost.go
 
 package syscall
 
diff --git a/src/syscall/ztypes_openbsd_amd64.go b/src/syscall/ztypes_openbsd_amd64.go
index 889b9551..9382727a 100644
--- a/src/syscall/ztypes_openbsd_amd64.go
+++ b/src/syscall/ztypes_openbsd_amd64.go
@@ -1,7 +1,5 @@
-// Created by cgo -godefs - DO NOT EDIT
-// cgo -godefs types_openbsd.go
-
-//go:build amd64 && openbsd
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
+// cgo -godefs types_openbsd.go | go run mkpost.go
 
 package syscall
 
diff --git a/src/syscall/ztypes_solaris_amd64.go b/src/syscall/ztypes_solaris_amd64.go
index d486cd00..a9f14517 100644
--- a/src/syscall/ztypes_solaris_amd64.go
+++ b/src/syscall/ztypes_solaris_amd64.go
@@ -1,7 +1,5 @@
-// Created by cgo -godefs - DO NOT EDIT
-// cgo -godefs types_solaris.go
-
-//go:build amd64 && solaris
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
+// cgo -godefs types_solaris.go | go run mkpost.go
 
 package syscall
 
diff --git a/src/testing/benchmark.go b/src/testing/benchmark.go
index 80a1b7de..3a7da9e5 100644
--- a/src/testing/benchmark.go
+++ b/src/testing/benchmark.go
@@ -5,6 +5,7 @@
 package testing
 
 import (
+	"context"
 	"flag"
 	"fmt"
 	"internal/sysinfo"
@@ -78,7 +79,7 @@ type InternalBenchmark struct {
 }
 
 // B is a type passed to [Benchmark] functions to manage benchmark
-// timing and to specify the number of iterations to run.
+// timing and control the number of iterations.
 //
 // A benchmark ends when its Benchmark function returns or calls any of the methods
 // FailNow, Fatal, Fatalf, SkipNow, Skip, or Skipf. Those methods must be called
@@ -93,7 +94,7 @@ type InternalBenchmark struct {
 type B struct {
 	common
 	importPath       string // import path of the package containing the benchmark
-	context          *benchContext
+	bstate           *benchState
 	N                int
 	previousN        int           // number of iterations in the previous run
 	previousDuration time.Duration // total duration of the previous run
@@ -113,6 +114,10 @@ type B struct {
 	netBytes  uint64
 	// Extra metrics collected by ReportMetric.
 	extra map[string]float64
+	// For Loop() to be executed in benchFunc.
+	// Loop() has its own control logic that skips the loop scaling.
+	// See issue #61515.
+	loopN int
 }
 
 // StartTimer starts timing a test. This function is called automatically
@@ -129,8 +134,7 @@ func (b *B) StartTimer() {
 }
 
 // StopTimer stops timing a test. This can be used to pause the timer
-// while performing complex initialization that you don't
-// want to measure.
+// while performing steps that you don't want to measure.
 func (b *B) StopTimer() {
 	if b.timerOn {
 		b.duration += highPrecisionTimeSince(b.start)
@@ -178,6 +182,7 @@ func (b *B) ReportAllocs() {
 func (b *B) runN(n int) {
 	benchmarkLock.Lock()
 	defer benchmarkLock.Unlock()
+	ctx, cancelCtx := context.WithCancel(context.Background())
 	defer func() {
 		b.runCleanup(normalPanic)
 		b.checkRaces()
@@ -187,6 +192,10 @@ func (b *B) runN(n int) {
 	runtime.GC()
 	b.resetRaces()
 	b.N = n
+	b.loopN = 0
+	b.ctx = ctx
+	b.cancelCtx = cancelCtx
+
 	b.parallelism = 1
 	b.ResetTimer()
 	b.StartTimer()
@@ -199,10 +208,10 @@ func (b *B) runN(n int) {
 // run1 runs the first iteration of benchFunc. It reports whether more
 // iterations of this benchmarks should be run.
 func (b *B) run1() bool {
-	if ctx := b.context; ctx != nil {
+	if bstate := b.bstate; bstate != nil {
 		// Extend maxLen, if needed.
-		if n := len(b.name) + ctx.extLen + 1; n > ctx.maxLen {
-			ctx.maxLen = n + 8 // Add additional slack to avoid too many jumps in size.
+		if n := len(b.name) + bstate.extLen + 1; n > bstate.maxLen {
+			bstate.maxLen = n + 8 // Add additional slack to avoid too many jumps in size.
 		}
 	}
 	go func() {
@@ -253,9 +262,9 @@ func (b *B) run() {
 			fmt.Fprintf(b.w, "cpu: %s\n", cpu)
 		}
 	})
-	if b.context != nil {
+	if b.bstate != nil {
 		// Running go test --test.bench
-		b.context.processBench(b) // Must call doBench.
+		b.bstate.processBench(b) // Must call doBench.
 	} else {
 		// Running func Benchmark.
 		b.doBench()
@@ -268,6 +277,29 @@ func (b *B) doBench() BenchmarkResult {
 	return b.result
 }
 
+func predictN(goalns int64, prevIters int64, prevns int64, last int64) int {
+	if prevns == 0 {
+		// Round up to dodge divide by zero. See https://go.dev/issue/70709.
+		prevns = 1
+	}
+
+	// Order of operations matters.
+	// For very fast benchmarks, prevIters ~= prevns.
+	// If you divide first, you get 0 or 1,
+	// which can hide an order of magnitude in execution time.
+	// So multiply first, then divide.
+	n := goalns * prevIters / prevns
+	// Run more iterations than we think we'll need (1.2x).
+	n += n / 5
+	// Don't grow too fast in case we had timing errors previously.
+	n = min(n, 100*last)
+	// Be sure to run at least one more than last time.
+	n = max(n, last+1)
+	// Don't run more than 1e9 times. (This also keeps n in int range on 32 bit platforms.)
+	n = min(n, 1e9)
+	return int(n)
+}
+
 // launch launches the benchmark function. It gradually increases the number
 // of benchmark iterations until the benchmark runs for the requested benchtime.
 // launch is run by the doBench function as a separate goroutine.
@@ -279,41 +311,27 @@ func (b *B) launch() {
 		b.signal <- true
 	}()
 
-	// Run the benchmark for at least the specified amount of time.
-	if b.benchTime.n > 0 {
-		// We already ran a single iteration in run1.
-		// If -benchtime=1x was requested, use that result.
-		// See https://golang.org/issue/32051.
-		if b.benchTime.n > 1 {
-			b.runN(b.benchTime.n)
-		}
-	} else {
-		d := b.benchTime.d
-		for n := int64(1); !b.failed && b.duration < d && n < 1e9; {
-			last := n
-			// Predict required iterations.
-			goalns := d.Nanoseconds()
-			prevIters := int64(b.N)
-			prevns := b.duration.Nanoseconds()
-			if prevns <= 0 {
-				// Round up, to avoid div by zero.
-				prevns = 1
+	// b.Loop does its own ramp-up logic so we just need to run it once.
+	// If b.loopN is non zero, it means b.Loop has already run.
+	if b.loopN == 0 {
+		// Run the benchmark for at least the specified amount of time.
+		if b.benchTime.n > 0 {
+			// We already ran a single iteration in run1.
+			// If -benchtime=1x was requested, use that result.
+			// See https://golang.org/issue/32051.
+			if b.benchTime.n > 1 {
+				b.runN(b.benchTime.n)
+			}
+		} else {
+			d := b.benchTime.d
+			for n := int64(1); !b.failed && b.duration < d && n < 1e9; {
+				last := n
+				// Predict required iterations.
+				goalns := d.Nanoseconds()
+				prevIters := int64(b.N)
+				n = int64(predictN(goalns, prevIters, b.duration.Nanoseconds(), last))
+				b.runN(int(n))
 			}
-			// Order of operations matters.
-			// For very fast benchmarks, prevIters ~= prevns.
-			// If you divide first, you get 0 or 1,
-			// which can hide an order of magnitude in execution time.
-			// So multiply first, then divide.
-			n = goalns * prevIters / prevns
-			// Run more iterations than we think we'll need (1.2x).
-			n += n / 5
-			// Don't grow too fast in case we had timing errors previously.
-			n = min(n, 100*last)
-			// Be sure to run at least one more than last time.
-			n = max(n, last+1)
-			// Don't run more than 1e9 times. (This also keeps n in int range on 32 bit platforms.)
-			n = min(n, 1e9)
-			b.runN(int(n))
 		}
 	}
 	b.result = BenchmarkResult{b.N, b.duration, b.bytes, b.netAllocs, b.netBytes, b.extra}
@@ -349,6 +367,86 @@ func (b *B) ReportMetric(n float64, unit string) {
 	b.extra[unit] = n
 }
 
+func (b *B) stopOrScaleBLoop() bool {
+	timeElapsed := highPrecisionTimeSince(b.start)
+	if timeElapsed >= b.benchTime.d {
+		// Stop the timer so we don't count cleanup time
+		b.StopTimer()
+		return false
+	}
+	// Loop scaling
+	goalns := b.benchTime.d.Nanoseconds()
+	prevIters := int64(b.N)
+	b.N = predictN(goalns, prevIters, timeElapsed.Nanoseconds(), prevIters)
+	b.loopN++
+	return true
+}
+
+func (b *B) loopSlowPath() bool {
+	if b.loopN == 0 {
+		// If it's the first call to b.Loop() in the benchmark function.
+		// Allows more precise measurement of benchmark loop cost counts.
+		// Also initialize b.N to 1 to kick start loop scaling.
+		b.N = 1
+		b.loopN = 1
+		b.ResetTimer()
+		return true
+	}
+	// Handles fixed iterations case
+	if b.benchTime.n > 0 {
+		if b.N < b.benchTime.n {
+			b.N = b.benchTime.n
+			b.loopN++
+			return true
+		}
+		b.StopTimer()
+		return false
+	}
+	// Handles fixed time case
+	return b.stopOrScaleBLoop()
+}
+
+// Loop returns true as long as the benchmark should continue running.
+//
+// A typical benchmark is structured like:
+//
+//	func Benchmark(b *testing.B) {
+//		... setup ...
+//		for b.Loop() {
+//			... code to measure ...
+//		}
+//		... cleanup ...
+//	}
+//
+// Loop resets the benchmark timer the first time it is called in a benchmark,
+// so any setup performed prior to starting the benchmark loop does not count
+// toward the benchmark measurement. Likewise, when it returns false, it stops
+// the timer so cleanup code is not measured.
+//
+// The compiler never optimizes away calls to functions within the body of a
+// "for b.Loop() { ... }" loop. This prevents surprises that can otherwise occur
+// if the compiler determines that the result of a benchmarked function is
+// unused. The loop must be written in exactly this form, and this only applies
+// to calls syntactically between the curly braces of the loop. Optimizations
+// are performed as usual in any functions called by the loop.
+//
+// After Loop returns false, b.N contains the total number of iterations that
+// ran, so the benchmark may use b.N to compute other average metrics.
+//
+// Prior to the introduction of Loop, benchmarks were expected to contain an
+// explicit loop from 0 to b.N. Benchmarks should either use Loop or contain a
+// loop to b.N, but not both. Loop offers more automatic management of the
+// benchmark timer, and runs each benchmark function only once per measurement,
+// whereas b.N-based benchmarks must run the benchmark function (and any
+// associated setup and cleanup) several times.
+func (b *B) Loop() bool {
+	if b.loopN != 0 && b.loopN < b.N {
+		b.loopN++
+		return true
+	}
+	return b.loopSlowPath()
+}
+
 // BenchmarkResult contains the results of a benchmark run.
 type BenchmarkResult struct {
 	N         int           // The number of iterations.
@@ -492,7 +590,7 @@ func benchmarkName(name string, n int) string {
 	return name
 }
 
-type benchContext struct {
+type benchState struct {
 	match *matcher
 
 	maxLen int // The largest recorded benchmark name.
@@ -517,17 +615,17 @@ func runBenchmarks(importPath string, matchString func(pat, str string) (bool, e
 			maxprocs = procs
 		}
 	}
-	ctx := &benchContext{
+	bstate := &benchState{
 		match:  newMatcher(matchString, *matchBenchmarks, "-test.bench", *skip),
 		extLen: len(benchmarkName("", maxprocs)),
 	}
 	var bs []InternalBenchmark
 	for _, Benchmark := range benchmarks {
-		if _, matched, _ := ctx.match.fullName(nil, Benchmark.Name); matched {
+		if _, matched, _ := bstate.match.fullName(nil, Benchmark.Name); matched {
 			bs = append(bs, Benchmark)
 			benchName := benchmarkName(Benchmark.Name, maxprocs)
-			if l := len(benchName) + ctx.extLen + 1; l > ctx.maxLen {
-				ctx.maxLen = l
+			if l := len(benchName) + bstate.extLen + 1; l > bstate.maxLen {
+				bstate.maxLen = l
 			}
 		}
 	}
@@ -544,7 +642,7 @@ func runBenchmarks(importPath string, matchString func(pat, str string) (bool, e
 			}
 		},
 		benchTime: benchTime,
-		context:   ctx,
+		bstate:    bstate,
 	}
 	if Verbose() {
 		main.chatty = newChattyPrinter(main.w)
@@ -554,7 +652,7 @@ func runBenchmarks(importPath string, matchString func(pat, str string) (bool, e
 }
 
 // processBench runs bench b for the configured CPU counts and prints the results.
-func (ctx *benchContext) processBench(b *B) {
+func (s *benchState) processBench(b *B) {
 	for i, procs := range cpuList {
 		for j := uint(0); j < *count; j++ {
 			runtime.GOMAXPROCS(procs)
@@ -562,7 +660,7 @@ func (ctx *benchContext) processBench(b *B) {
 
 			// If it's chatty, we've already printed this information.
 			if b.chatty == nil {
-				fmt.Fprintf(b.w, "%-*s\t", ctx.maxLen, benchName)
+				fmt.Fprintf(b.w, "%-*s\t", s.maxLen, benchName)
 			}
 			// Recompute the running time for all but the first iteration.
 			if i > 0 || j > 0 {
@@ -589,7 +687,7 @@ func (ctx *benchContext) processBench(b *B) {
 			}
 			results := r.String()
 			if b.chatty != nil {
-				fmt.Fprintf(b.w, "%-*s\t", ctx.maxLen, benchName)
+				fmt.Fprintf(b.w, "%-*s\t", s.maxLen, benchName)
 			}
 			if *benchmarkMemory || b.showAllocResult {
 				results += "\t" + r.MemString()
@@ -629,8 +727,8 @@ func (b *B) Run(name string, f func(b *B)) bool {
 	defer benchmarkLock.Lock()
 
 	benchName, ok, partial := b.name, true, false
-	if b.context != nil {
-		benchName, ok, partial = b.context.match.fullName(&b.common, name)
+	if b.bstate != nil {
+		benchName, ok, partial = b.bstate.match.fullName(&b.common, name)
 	}
 	if !ok {
 		return true
@@ -651,7 +749,7 @@ func (b *B) Run(name string, f func(b *B)) bool {
 		importPath: b.importPath,
 		benchFunc:  f,
 		benchTime:  b.benchTime,
-		context:    b.context,
+		bstate:     b.bstate,
 	}
 	if partial {
 		// Partial name match, like -bench=X/Y matching BenchmarkX.
diff --git a/src/testing/benchmark_test.go b/src/testing/benchmark_test.go
index 66f555d1..e2dd24c8 100644
--- a/src/testing/benchmark_test.go
+++ b/src/testing/benchmark_test.go
@@ -7,6 +7,8 @@ package testing_test
 import (
 	"bytes"
 	"cmp"
+	"context"
+	"errors"
 	"runtime"
 	"slices"
 	"strings"
@@ -127,6 +129,34 @@ func TestRunParallelSkipNow(t *testing.T) {
 	})
 }
 
+func TestBenchmarkContext(t *testing.T) {
+	testing.Benchmark(func(b *testing.B) {
+		ctx := b.Context()
+		if err := ctx.Err(); err != nil {
+			b.Fatalf("expected non-canceled context, got %v", err)
+		}
+
+		var innerCtx context.Context
+		b.Run("inner", func(b *testing.B) {
+			innerCtx = b.Context()
+			if err := innerCtx.Err(); err != nil {
+				b.Fatalf("expected inner benchmark to not inherit canceled context, got %v", err)
+			}
+		})
+		b.Run("inner2", func(b *testing.B) {
+			if !errors.Is(innerCtx.Err(), context.Canceled) {
+				t.Fatal("expected context of sibling benchmark to be canceled after its test function finished")
+			}
+		})
+
+		t.Cleanup(func() {
+			if !errors.Is(ctx.Err(), context.Canceled) {
+				t.Fatal("expected context canceled before cleanup")
+			}
+		})
+	})
+}
+
 func ExampleB_RunParallel() {
 	// Parallel benchmark for text/template.Template.Execute on a single object.
 	testing.Benchmark(func(b *testing.B) {
@@ -167,7 +197,7 @@ func ExampleB_ReportMetric() {
 	// specific algorithm (in this case, sorting).
 	testing.Benchmark(func(b *testing.B) {
 		var compares int64
-		for i := 0; i < b.N; i++ {
+		for b.Loop() {
 			s := []int{5, 4, 3, 2, 1}
 			slices.SortFunc(s, func(a, b int) int {
 				compares++
diff --git a/src/testing/example.go b/src/testing/example.go
index b14477a4..c343ae2a 100644
--- a/src/testing/example.go
+++ b/src/testing/example.go
@@ -6,6 +6,7 @@ package testing
 
 import (
 	"fmt"
+	"runtime"
 	"slices"
 	"strings"
 	"time"
@@ -66,6 +67,10 @@ func (eg *InternalExample) processRunResult(stdout string, timeSpent time.Durati
 	var fail string
 	got := strings.TrimSpace(stdout)
 	want := strings.TrimSpace(eg.Output)
+	if runtime.GOOS == "windows" {
+		got = strings.ReplaceAll(got, "\r\n", "\n")
+		want = strings.ReplaceAll(want, "\r\n", "\n")
+	}
 	if eg.Unordered {
 		if sortLines(got) != sortLines(want) && recovered == nil {
 			fail = fmt.Sprintf("got:\n%s\nwant (unordered):\n%s\n", stdout, eg.Output)
diff --git a/src/testing/example_loop_test.go b/src/testing/example_loop_test.go
new file mode 100644
index 00000000..eff8bab3
--- /dev/null
+++ b/src/testing/example_loop_test.go
@@ -0,0 +1,48 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package testing_test
+
+import (
+	"math/rand/v2"
+	"testing"
+)
+
+// ExBenchmark shows how to use b.Loop in a benchmark.
+//
+// (If this were a real benchmark, not an example, this would be named
+// BenchmarkSomething.)
+func ExBenchmark(b *testing.B) {
+	// Generate a large random slice to use as an input.
+	// Since this is done before the first call to b.Loop(),
+	// it doesn't count toward the benchmark time.
+	input := make([]int, 128<<10)
+	for i := range input {
+		input[i] = rand.Int()
+	}
+
+	// Perform the benchmark.
+	for b.Loop() {
+		// Normally, the compiler would be allowed to optimize away the call
+		// to sum because it has no side effects and the result isn't used.
+		// However, inside a b.Loop loop, the compiler ensures function calls
+		// aren't optimized away.
+		sum(input)
+	}
+
+	// Outside the loop, the timer is stopped, so we could perform
+	// cleanup if necessary without affecting the result.
+}
+
+func sum(data []int) int {
+	total := 0
+	for _, value := range data {
+		total += value
+	}
+	return total
+}
+
+func ExampleB_Loop() {
+	testing.Benchmark(ExBenchmark)
+}
diff --git a/src/testing/export_test.go b/src/testing/export_test.go
index 10a5b04a..a2dddc79 100644
--- a/src/testing/export_test.go
+++ b/src/testing/export_test.go
@@ -9,3 +9,5 @@ var PrettyPrint = prettyPrint
 type HighPrecisionTime = highPrecisionTime
 
 var HighPrecisionTimeNow = highPrecisionTimeNow
+
+const ParallelConflict = parallelConflict
diff --git a/src/testing/flag_test.go b/src/testing/flag_test.go
index 6f76c237..6a775442 100644
--- a/src/testing/flag_test.go
+++ b/src/testing/flag_test.go
@@ -28,11 +28,7 @@ func TestFlag(t *testing.T) {
 		flag := flag
 		t.Run(flag, func(t *testing.T) {
 			t.Parallel()
-			exe, err := os.Executable()
-			if err != nil {
-				exe = os.Args[0]
-			}
-			cmd := exec.Command(exe, "-test.run=^TestFlag$", "-test_flag_arg="+flag)
+			cmd := exec.Command(testenv.Executable(t), "-test.run=^TestFlag$", "-test_flag_arg="+flag)
 			if flag != "" {
 				cmd.Args = append(cmd.Args, flag)
 			}
diff --git a/src/testing/fstest/testfs.go b/src/testing/fstest/testfs.go
index 080bcdd6..affdfa64 100644
--- a/src/testing/fstest/testfs.go
+++ b/src/testing/fstest/testfs.go
@@ -10,8 +10,8 @@ import (
 	"fmt"
 	"io"
 	"io/fs"
+	"maps"
 	"path"
-	"reflect"
 	"slices"
 	"strings"
 	"testing/iotest"
@@ -72,13 +72,7 @@ func testFS(fsys fs.FS, expected ...string) error {
 	}
 	delete(found, ".")
 	if len(expected) == 0 && len(found) > 0 {
-		var list []string
-		for k := range found {
-			if k != "." {
-				list = append(list, k)
-			}
-		}
-		slices.Sort(list)
+		list := slices.Sorted(maps.Keys(found))
 		if len(list) > 15 {
 			list = append(list[:10], "...")
 		}
@@ -358,7 +352,7 @@ func (t *fsTester) checkGlob(dir string, list []fs.DirEntry) {
 		t.errorf("%s: Glob(%#q): %w", dir, glob, err)
 		return
 	}
-	if reflect.DeepEqual(want, names) {
+	if slices.Equal(want, names) {
 		return
 	}
 
@@ -576,7 +570,7 @@ func (t *fsTester) checkFileRead(file, desc string, data1, data2 []byte) {
 	}
 }
 
-// checkBadPath checks that various invalid forms of file's name cannot be opened using t.fsys.Open.
+// checkOpen validates file opening behavior by attempting to open and then close the given file path.
 func (t *fsTester) checkOpen(file string) {
 	t.checkBadPath(file, "Open", func(file string) error {
 		f, err := t.fsys.Open(file)
diff --git a/src/testing/fuzz.go b/src/testing/fuzz.go
index d561225b..dceb786a 100644
--- a/src/testing/fuzz.go
+++ b/src/testing/fuzz.go
@@ -5,6 +5,7 @@
 package testing
 
 import (
+	"context"
 	"errors"
 	"flag"
 	"fmt"
@@ -67,8 +68,8 @@ type InternalFuzzTarget struct {
 // that are allowed in the (*F).Fuzz function are (*F).Failed and (*F).Name.
 type F struct {
 	common
-	fuzzContext *fuzzContext
-	testContext *testContext
+	fstate *fuzzState
+	tstate *testState
 
 	// inFuzzFn is true when the fuzz function is running. Most F methods cannot
 	// be called when inFuzzFn is true.
@@ -244,22 +245,22 @@ func (f *F) Fuzz(ff any) {
 	// corpus and entries declared with F.Add.
 	//
 	// Don't load the seed corpus if this is a worker process; we won't use it.
-	if f.fuzzContext.mode != fuzzWorker {
+	if f.fstate.mode != fuzzWorker {
 		for _, c := range f.corpus {
-			if err := f.fuzzContext.deps.CheckCorpus(c.Values, types); err != nil {
+			if err := f.fstate.deps.CheckCorpus(c.Values, types); err != nil {
 				// TODO(#48302): Report the source location of the F.Add call.
 				f.Fatal(err)
 			}
 		}
 
 		// Load seed corpus
-		c, err := f.fuzzContext.deps.ReadCorpus(filepath.Join(corpusDir, f.name), types)
+		c, err := f.fstate.deps.ReadCorpus(filepath.Join(corpusDir, f.name), types)
 		if err != nil {
 			f.Fatal(err)
 		}
 		for i := range c {
 			c[i].IsSeed = true // these are all seed corpus values
-			if f.fuzzContext.mode == fuzzCoordinator {
+			if f.fstate.mode == fuzzCoordinator {
 				// If this is the coordinator process, zero the values, since we don't need
 				// to hold onto them.
 				c[i].Values = nil
@@ -285,14 +286,16 @@ func (f *F) Fuzz(ff any) {
 		if e.Path != "" {
 			testName = fmt.Sprintf("%s/%s", testName, filepath.Base(e.Path))
 		}
-		if f.testContext.isFuzzing {
+		if f.tstate.isFuzzing {
 			// Don't preserve subtest names while fuzzing. If fn calls T.Run,
 			// there will be a very large number of subtests with duplicate names,
 			// which will use a large amount of memory. The subtest names aren't
 			// useful since there's no way to re-run them deterministically.
-			f.testContext.match.clearSubNames()
+			f.tstate.match.clearSubNames()
 		}
 
+		ctx, cancelCtx := context.WithCancel(f.ctx)
+
 		// Record the stack trace at the point of this call so that if the subtest
 		// function - which runs in a separate stack - is marked as a helper, we can
 		// continue walking the stack into the parent test.
@@ -300,15 +303,17 @@ func (f *F) Fuzz(ff any) {
 		n := runtime.Callers(2, pc[:])
 		t := &T{
 			common: common{
-				barrier: make(chan bool),
-				signal:  make(chan bool),
-				name:    testName,
-				parent:  &f.common,
-				level:   f.level + 1,
-				creator: pc[:n],
-				chatty:  f.chatty,
+				barrier:   make(chan bool),
+				signal:    make(chan bool),
+				name:      testName,
+				parent:    &f.common,
+				level:     f.level + 1,
+				creator:   pc[:n],
+				chatty:    f.chatty,
+				ctx:       ctx,
+				cancelCtx: cancelCtx,
 			},
-			context: f.testContext,
+			tstate: f.tstate,
 		}
 		if captureOut != nil {
 			// t.parent aliases f.common.
@@ -328,9 +333,9 @@ func (f *F) Fuzz(ff any) {
 			// we make sure it is called right before the tRunner function
 			// exits, regardless of whether it was executed cleanly, panicked,
 			// or if the fuzzFn called t.Fatal.
-			if f.testContext.isFuzzing {
-				defer f.fuzzContext.deps.SnapshotCoverage()
-				f.fuzzContext.deps.ResetCoverage()
+			if f.tstate.isFuzzing {
+				defer f.fstate.deps.SnapshotCoverage()
+				f.fstate.deps.ResetCoverage()
 			}
 			fn.Call(args)
 		})
@@ -342,14 +347,14 @@ func (f *F) Fuzz(ff any) {
 		return !t.Failed()
 	}
 
-	switch f.fuzzContext.mode {
+	switch f.fstate.mode {
 	case fuzzCoordinator:
 		// Fuzzing is enabled, and this is the test process started by 'go test'.
 		// Act as the coordinator process, and coordinate workers to perform the
 		// actual fuzzing.
 		corpusTargetDir := filepath.Join(corpusDir, f.name)
 		cacheTargetDir := filepath.Join(*fuzzCacheDir, f.name)
-		err := f.fuzzContext.deps.CoordinateFuzzing(
+		err := f.fstate.deps.CoordinateFuzzing(
 			fuzzDuration.d,
 			int64(fuzzDuration.n),
 			minimizeDuration.d,
@@ -376,7 +381,7 @@ func (f *F) Fuzz(ff any) {
 	case fuzzWorker:
 		// Fuzzing is enabled, and this is a worker process. Follow instructions
 		// from the coordinator.
-		if err := f.fuzzContext.deps.RunFuzzWorker(func(e corpusEntry) error {
+		if err := f.fstate.deps.RunFuzzWorker(func(e corpusEntry) error {
 			// Don't write to f.w (which points to Stdout) if running from a
 			// fuzz worker. This would become very verbose, particularly during
 			// minimization. Return the error instead, and let the caller deal
@@ -398,7 +403,7 @@ func (f *F) Fuzz(ff any) {
 		// corpus now.
 		for _, e := range f.corpus {
 			name := fmt.Sprintf("%s/%s", f.name, filepath.Base(e.Path))
-			if _, ok, _ := f.testContext.match.fullName(nil, name); ok {
+			if _, ok, _ := f.tstate.match.fullName(nil, name); ok {
 				run(f.w, e)
 			}
 		}
@@ -451,8 +456,8 @@ type fuzzCrashError interface {
 	CrashPath() string
 }
 
-// fuzzContext holds fields common to all fuzz tests.
-type fuzzContext struct {
+// fuzzState holds fields common to all fuzz tests.
+type fuzzState struct {
 	deps testDeps
 	mode fuzzMode
 }
@@ -486,9 +491,9 @@ func runFuzzTests(deps testDeps, fuzzTests []InternalFuzzTarget, deadline time.T
 				break
 			}
 
-			tctx := newTestContext(*parallel, m)
-			tctx.deadline = deadline
-			fctx := &fuzzContext{deps: deps, mode: seedCorpusOnly}
+			tstate := newTestState(*parallel, m)
+			tstate.deadline = deadline
+			fstate := &fuzzState{deps: deps, mode: seedCorpusOnly}
 			root := common{w: os.Stdout} // gather output in one place
 			if Verbose() {
 				root.chatty = newChattyPrinter(root.w)
@@ -497,7 +502,7 @@ func runFuzzTests(deps testDeps, fuzzTests []InternalFuzzTarget, deadline time.T
 				if shouldFailFast() {
 					break
 				}
-				testName, matched, _ := tctx.match.fullName(nil, ft.Name)
+				testName, matched, _ := tstate.match.fullName(nil, ft.Name)
 				if !matched {
 					continue
 				}
@@ -508,17 +513,20 @@ func runFuzzTests(deps testDeps, fuzzTests []InternalFuzzTarget, deadline time.T
 						continue
 					}
 				}
+				ctx, cancelCtx := context.WithCancel(context.Background())
 				f := &F{
 					common: common{
-						signal:  make(chan bool),
-						barrier: make(chan bool),
-						name:    testName,
-						parent:  &root,
-						level:   root.level + 1,
-						chatty:  root.chatty,
+						signal:    make(chan bool),
+						barrier:   make(chan bool),
+						name:      testName,
+						parent:    &root,
+						level:     root.level + 1,
+						chatty:    root.chatty,
+						ctx:       ctx,
+						cancelCtx: cancelCtx,
 					},
-					testContext: tctx,
-					fuzzContext: fctx,
+					tstate: tstate,
+					fstate: fstate,
 				}
 				f.w = indenter{&f.common}
 				if f.chatty != nil {
@@ -554,17 +562,17 @@ func runFuzzing(deps testDeps, fuzzTests []InternalFuzzTarget) (ok bool) {
 		return true
 	}
 	m := newMatcher(deps.MatchString, *matchFuzz, "-test.fuzz", *skip)
-	tctx := newTestContext(1, m)
-	tctx.isFuzzing = true
-	fctx := &fuzzContext{
+	tstate := newTestState(1, m)
+	tstate.isFuzzing = true
+	fstate := &fuzzState{
 		deps: deps,
 	}
 	root := common{w: os.Stdout}
 	if *isFuzzWorker {
 		root.w = io.Discard
-		fctx.mode = fuzzWorker
+		fstate.mode = fuzzWorker
 	} else {
-		fctx.mode = fuzzCoordinator
+		fstate.mode = fuzzCoordinator
 	}
 	if Verbose() && !*isFuzzWorker {
 		root.chatty = newChattyPrinter(root.w)
@@ -573,7 +581,7 @@ func runFuzzing(deps testDeps, fuzzTests []InternalFuzzTarget) (ok bool) {
 	var testName string
 	var matched []string
 	for i := range fuzzTests {
-		name, ok, _ := tctx.match.fullName(nil, fuzzTests[i].Name)
+		name, ok, _ := tstate.match.fullName(nil, fuzzTests[i].Name)
 		if !ok {
 			continue
 		}
@@ -590,17 +598,20 @@ func runFuzzing(deps testDeps, fuzzTests []InternalFuzzTarget) (ok bool) {
 		return false
 	}
 
+	ctx, cancelCtx := context.WithCancel(context.Background())
 	f := &F{
 		common: common{
-			signal:  make(chan bool),
-			barrier: nil, // T.Parallel has no effect when fuzzing.
-			name:    testName,
-			parent:  &root,
-			level:   root.level + 1,
-			chatty:  root.chatty,
+			signal:    make(chan bool),
+			barrier:   nil, // T.Parallel has no effect when fuzzing.
+			name:      testName,
+			parent:    &root,
+			level:     root.level + 1,
+			chatty:    root.chatty,
+			ctx:       ctx,
+			cancelCtx: cancelCtx,
 		},
-		fuzzContext: fctx,
-		testContext: tctx,
+		fstate: fstate,
+		tstate: tstate,
 	}
 	f.w = indenter{&f.common}
 	if f.chatty != nil {
@@ -694,7 +705,7 @@ func fRunner(f *F, fn func(*F)) {
 			// This only affects fuzz tests run as normal tests.
 			// While fuzzing, T.Parallel has no effect, so f.sub is empty, and this
 			// branch is not taken. f.barrier is nil in that case.
-			f.testContext.release()
+			f.tstate.release()
 			close(f.barrier)
 			// Wait for the subtests to complete.
 			for _, sub := range f.sub {
diff --git a/src/testing/helper_test.go b/src/testing/helper_test.go
index da5622f8..a698e79f 100644
--- a/src/testing/helper_test.go
+++ b/src/testing/helper_test.go
@@ -23,15 +23,9 @@ func TestTBHelper(t *testing.T) {
 		return
 	}
 
-	testenv.MustHaveExec(t)
 	t.Parallel()
 
-	exe, err := os.Executable()
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	cmd := testenv.Command(t, exe, "-test.run=^TestTBHelper$")
+	cmd := testenv.Command(t, testenv.Executable(t), "-test.run=^TestTBHelper$")
 	cmd = testenv.CleanCmdEnv(cmd)
 	cmd.Env = append(cmd.Env, "GO_WANT_HELPER_PROCESS=1")
 	out, _ := cmd.CombinedOutput()
@@ -66,15 +60,9 @@ func TestTBHelperParallel(t *testing.T) {
 		return
 	}
 
-	testenv.MustHaveExec(t)
 	t.Parallel()
 
-	exe, err := os.Executable()
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	cmd := testenv.Command(t, exe, "-test.run=^TestTBHelperParallel$")
+	cmd := testenv.Command(t, testenv.Executable(t), "-test.run=^TestTBHelperParallel$")
 	cmd = testenv.CleanCmdEnv(cmd)
 	cmd.Env = append(cmd.Env, "GO_WANT_HELPER_PROCESS=1")
 	out, _ := cmd.CombinedOutput()
diff --git a/src/testing/loop_test.go b/src/testing/loop_test.go
new file mode 100644
index 00000000..7a1a93fc
--- /dev/null
+++ b/src/testing/loop_test.go
@@ -0,0 +1,57 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package testing
+
+func TestBenchmarkBLoop(t *T) {
+	var initialStart highPrecisionTime
+	var firstStart highPrecisionTime
+	var lastStart highPrecisionTime
+	var runningEnd bool
+	runs := 0
+	iters := 0
+	finalBN := 0
+	bRet := Benchmark(func(b *B) {
+		initialStart = b.start
+		runs++
+		for b.Loop() {
+			if iters == 0 {
+				firstStart = b.start
+			}
+			lastStart = b.start
+			iters++
+		}
+		finalBN = b.N
+		runningEnd = b.timerOn
+	})
+	// Verify that a b.Loop benchmark is invoked just once.
+	if runs != 1 {
+		t.Errorf("want runs == 1, got %d", runs)
+	}
+	// Verify that at least one iteration ran.
+	if iters == 0 {
+		t.Fatalf("no iterations ran")
+	}
+	// Verify that b.N, bRet.N, and the b.Loop() iteration count match.
+	if finalBN != iters || bRet.N != iters {
+		t.Errorf("benchmark iterations mismatch: %d loop iterations, final b.N=%d, bRet.N=%d", iters, finalBN, bRet.N)
+	}
+	// Make sure the benchmark ran for an appropriate amount of time.
+	if bRet.T < benchTime.d {
+		t.Fatalf("benchmark ran for %s, want >= %s", bRet.T, benchTime.d)
+	}
+	// Verify that the timer is reset on the first loop, and then left alone.
+	if firstStart == initialStart {
+		t.Errorf("b.Loop did not reset the timer")
+	}
+	if lastStart != firstStart {
+		t.Errorf("timer was reset during iteration")
+	}
+	// Verify that it stopped the timer after the last loop.
+	if runningEnd {
+		t.Errorf("timer was still running after last iteration")
+	}
+}
+
+// See also TestBenchmarkBLoop* in other files.
diff --git a/src/testing/slogtest/slogtest.go b/src/testing/slogtest/slogtest.go
index 5c3aced6..f9e2d900 100644
--- a/src/testing/slogtest/slogtest.go
+++ b/src/testing/slogtest/slogtest.go
@@ -265,7 +265,7 @@ func TestHandler(h slog.Handler, results func() []map[string]any) error {
 	if g, w := len(res), len(cases); g != w {
 		return fmt.Errorf("got %d results, want %d", g, w)
 	}
-	for i, got := range results() {
+	for i, got := range res {
 		c := cases[i]
 		for _, check := range c.checks {
 			if problem := check(got); problem != "" {
diff --git a/src/testing/sub_test.go b/src/testing/sub_test.go
index 1c23d054..82ec5809 100644
--- a/src/testing/sub_test.go
+++ b/src/testing/sub_test.go
@@ -7,9 +7,9 @@ package testing
 import (
 	"bytes"
 	"fmt"
-	"reflect"
 	"regexp"
 	"runtime"
+	"slices"
 	"strings"
 	"sync"
 	"sync/atomic"
@@ -21,12 +21,11 @@ func init() {
 	benchTime.d = 100 * time.Millisecond
 }
 
-func TestTestContext(t *T) {
+func TestTestState(t *T) {
 	const (
 		add1 = 0
 		done = 1
 	)
-	// After each of the calls are applied to the context, the
 	type call struct {
 		typ int // run or done
 		// result from applying the call
@@ -72,7 +71,7 @@ func TestTestContext(t *T) {
 		},
 	}}
 	for i, tc := range testCases {
-		ctx := &testContext{
+		tstate := &testState{
 			startParallel: make(chan bool),
 			maxParallel:   tc.max,
 		}
@@ -88,18 +87,18 @@ func TestTestContext(t *T) {
 			started := false
 			switch call.typ {
 			case add1:
-				signal := doCall(ctx.waitParallel)
+				signal := doCall(tstate.waitParallel)
 				select {
 				case <-signal:
 					started = true
-				case ctx.startParallel <- true:
+				case tstate.startParallel <- true:
 					<-signal
 				}
 			case done:
-				signal := doCall(ctx.release)
+				signal := doCall(tstate.release)
 				select {
 				case <-signal:
-				case <-ctx.startParallel:
+				case <-tstate.startParallel:
 					started = true
 					<-signal
 				}
@@ -107,11 +106,11 @@ func TestTestContext(t *T) {
 			if started != call.started {
 				t.Errorf("%d:%d:started: got %v; want %v", i, j, started, call.started)
 			}
-			if ctx.running != call.running {
-				t.Errorf("%d:%d:running: got %v; want %v", i, j, ctx.running, call.running)
+			if tstate.running != call.running {
+				t.Errorf("%d:%d:running: got %v; want %v", i, j, tstate.running, call.running)
 			}
-			if ctx.numWaiting != call.waiting {
-				t.Errorf("%d:%d:waiting: got %v; want %v", i, j, ctx.numWaiting, call.waiting)
+			if tstate.numWaiting != call.waiting {
+				t.Errorf("%d:%d:waiting: got %v; want %v", i, j, tstate.numWaiting, call.waiting)
 			}
 		}
 	}
@@ -507,7 +506,7 @@ func TestTRun(t *T) {
 	}}
 	for _, tc := range testCases {
 		t.Run(tc.desc, func(t *T) {
-			ctx := newTestContext(tc.maxPar, allMatcher())
+			tstate := newTestState(tc.maxPar, allMatcher())
 			buf := &strings.Builder{}
 			root := &T{
 				common: common{
@@ -516,14 +515,14 @@ func TestTRun(t *T) {
 					name:    "",
 					w:       buf,
 				},
-				context: ctx,
+				tstate: tstate,
 			}
 			if tc.chatty {
 				root.chatty = newChattyPrinter(root.w)
 				root.chatty.json = tc.json
 			}
 			ok := root.Run(tc.desc, tc.f)
-			ctx.release()
+			tstate.release()
 
 			if ok != tc.ok {
 				t.Errorf("%s:ok: got %v; want %v", tc.desc, ok, tc.ok)
@@ -531,8 +530,8 @@ func TestTRun(t *T) {
 			if ok != !root.Failed() {
 				t.Errorf("%s:root failed: got %v; want %v", tc.desc, !ok, root.Failed())
 			}
-			if ctx.running != 0 || ctx.numWaiting != 0 {
-				t.Errorf("%s:running and waiting non-zero: got %d and %d", tc.desc, ctx.running, ctx.numWaiting)
+			if tstate.running != 0 || tstate.numWaiting != 0 {
+				t.Errorf("%s:running and waiting non-zero: got %d and %d", tc.desc, tstate.running, tstate.numWaiting)
 			}
 			got := strings.TrimSpace(buf.String())
 			want := strings.TrimSpace(tc.output)
@@ -790,8 +789,8 @@ func TestRacyOutput(t *T) {
 	}
 
 	root := &T{
-		common:  common{w: &funcWriter{raceDetector}},
-		context: newTestContext(1, allMatcher()),
+		common: common{w: &funcWriter{raceDetector}},
+		tstate: newTestState(1, allMatcher()),
 	}
 	root.chatty = newChattyPrinter(root.w)
 	root.Run("", func(t *T) {
@@ -815,7 +814,7 @@ func TestRacyOutput(t *T) {
 
 // The late log message did not include the test name.  Issue 29388.
 func TestLogAfterComplete(t *T) {
-	ctx := newTestContext(1, allMatcher())
+	tstate := newTestState(1, allMatcher())
 	var buf bytes.Buffer
 	t1 := &T{
 		common: common{
@@ -824,7 +823,7 @@ func TestLogAfterComplete(t *T) {
 			signal: make(chan bool, 1),
 			w:      &buf,
 		},
-		context: ctx,
+		tstate: tstate,
 	}
 
 	c1 := make(chan bool)
@@ -886,7 +885,7 @@ func TestCleanup(t *T) {
 		t.Cleanup(func() { cleanups = append(cleanups, 1) })
 		t.Cleanup(func() { cleanups = append(cleanups, 2) })
 	})
-	if got, want := cleanups, []int{2, 1}; !reflect.DeepEqual(got, want) {
+	if got, want := cleanups, []int{2, 1}; !slices.Equal(got, want) {
 		t.Errorf("unexpected cleanup record; got %v want %v", got, want)
 	}
 }
diff --git a/src/testing/synctest/context_example_test.go b/src/testing/synctest/context_example_test.go
new file mode 100644
index 00000000..5f7205e5
--- /dev/null
+++ b/src/testing/synctest/context_example_test.go
@@ -0,0 +1,78 @@
+// Copyright 2025 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build goexperiment.synctest
+
+package synctest_test
+
+import (
+	"context"
+	"fmt"
+	"testing/synctest"
+	"time"
+)
+
+// This example demonstrates testing the context.AfterFunc function.
+//
+// AfterFunc registers a function to execute in a new goroutine
+// after a context is canceled.
+//
+// The test verifies that the function is not run before the context is canceled,
+// and is run after the context is canceled.
+func Example_contextAfterFunc() {
+	synctest.Run(func() {
+		// Create a context.Context which can be canceled.
+		ctx, cancel := context.WithCancel(context.Background())
+
+		// context.AfterFunc registers a function to be called
+		// when a context is canceled.
+		afterFuncCalled := false
+		context.AfterFunc(ctx, func() {
+			afterFuncCalled = true
+		})
+
+		// The context has not been canceled, so the AfterFunc is not called.
+		synctest.Wait()
+		fmt.Printf("before context is canceled: afterFuncCalled=%v\n", afterFuncCalled)
+
+		// Cancel the context and wait for the AfterFunc to finish executing.
+		// Verify that the AfterFunc ran.
+		cancel()
+		synctest.Wait()
+		fmt.Printf("after context is canceled:  afterFuncCalled=%v\n", afterFuncCalled)
+
+		// Output:
+		// before context is canceled: afterFuncCalled=false
+		// after context is canceled:  afterFuncCalled=true
+	})
+}
+
+// This example demonstrates testing the context.WithTimeout function.
+//
+// WithTimeout creates a context which is canceled after a timeout.
+//
+// The test verifies that the context is not canceled before the timeout expires,
+// and is canceled after the timeout expires.
+func Example_contextWithTimeout() {
+	synctest.Run(func() {
+		// Create a context.Context which is canceled after a timeout.
+		const timeout = 5 * time.Second
+		ctx, cancel := context.WithTimeout(context.Background(), timeout)
+		defer cancel()
+
+		// Wait just less than the timeout.
+		time.Sleep(timeout - time.Nanosecond)
+		synctest.Wait()
+		fmt.Printf("before timeout: ctx.Err() = %v\n", ctx.Err())
+
+		// Wait the rest of the way until the timeout.
+		time.Sleep(time.Nanosecond)
+		synctest.Wait()
+		fmt.Printf("after timeout:  ctx.Err() = %v\n", ctx.Err())
+
+		// Output:
+		// before timeout: ctx.Err() = 
+		// after timeout:  ctx.Err() = context deadline exceeded
+	})
+}
diff --git a/src/testing/synctest/synctest.go b/src/testing/synctest/synctest.go
new file mode 100644
index 00000000..90efc789
--- /dev/null
+++ b/src/testing/synctest/synctest.go
@@ -0,0 +1,67 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build goexperiment.synctest
+
+// Package synctest provides support for testing concurrent code.
+//
+// This package only exists when using Go compiled with GOEXPERIMENT=synctest.
+// It is experimental, and not subject to the Go 1 compatibility promise.
+package synctest
+
+import (
+	"internal/synctest"
+)
+
+// Run executes f in a new goroutine.
+//
+// The new goroutine and any goroutines transitively started by it form
+// an isolated "bubble".
+// Run waits for all goroutines in the bubble to exit before returning.
+//
+// Goroutines in the bubble use a synthetic time implementation.
+// The initial time is midnight UTC 2000-01-01.
+//
+// Time advances when every goroutine in the bubble is blocked.
+// For example, a call to time.Sleep will block until all other
+// goroutines are blocked and return after the bubble's clock has
+// advanced. See [Wait] for the specific definition of blocked.
+//
+// If every goroutine is blocked and there are no timers scheduled,
+// Run panics.
+//
+// Channels, time.Timers, and time.Tickers created within the bubble
+// are associated with it. Operating on a bubbled channel, timer, or ticker
+// from outside the bubble panics.
+func Run(f func()) {
+	synctest.Run(f)
+}
+
+// Wait blocks until every goroutine within the current bubble,
+// other than the current goroutine, is durably blocked.
+// It panics if called from a non-bubbled goroutine,
+// or if two goroutines in the same bubble call Wait at the same time.
+//
+// A goroutine is durably blocked if can only be unblocked by another
+// goroutine in its bubble. The following operations durably block
+// a goroutine:
+//   - a send or receive on a channel from within the bubble
+//   - a select statement where every case is a channel within the bubble
+//   - sync.Cond.Wait
+//   - time.Sleep
+//
+// A goroutine executing a system call or waiting for an external event
+// such as a network operation is not durably blocked.
+// For example, a goroutine blocked reading from an network connection
+// is not durably blocked even if no data is currently available on the
+// connection, because it may be unblocked by data written from outside
+// the bubble or may be in the process of receiving data from a kernel
+// network buffer.
+//
+// A goroutine is not durably blocked when blocked on a send or receive
+// on a channel that was not created within its bubble, because it may
+// be unblocked by a channel receive or send from outside its bubble.
+func Wait() {
+	synctest.Wait()
+}
diff --git a/src/testing/testing.go b/src/testing/testing.go
index 526cba39..3833bfc8 100644
--- a/src/testing/testing.go
+++ b/src/testing/testing.go
@@ -72,27 +72,24 @@
 // A sample benchmark function looks like this:
 //
 //	func BenchmarkRandInt(b *testing.B) {
-//	    for range b.N {
+//	    for b.Loop() {
 //	        rand.Int()
 //	    }
 //	}
 //
-// The benchmark function must run the target code b.N times.
-// It is called multiple times with b.N adjusted until the
-// benchmark function lasts long enough to be timed reliably.
 // The output
 //
 //	BenchmarkRandInt-8   	68453040	        17.8 ns/op
 //
-// means that the loop ran 68453040 times at a speed of 17.8 ns per loop.
+// means that the body of the loop ran 68453040 times at a speed of 17.8 ns per loop.
 //
-// If a benchmark needs some expensive setup before running, the timer
-// may be reset:
+// Only the body of the loop is timed, so benchmarks may do expensive
+// setup before calling b.Loop, which will not be counted toward the
+// benchmark measurement:
 //
 //	func BenchmarkBigLen(b *testing.B) {
 //	    big := NewBig()
-//	    b.ResetTimer()
-//	    for range b.N {
+//	    for b.Loop() {
 //	        big.Len()
 //	    }
 //	}
@@ -120,6 +117,37 @@
 // In particular, https://golang.org/x/perf/cmd/benchstat performs
 // statistically robust A/B comparisons.
 //
+// # b.N-style benchmarks
+//
+// Prior to the introduction of [B.Loop], benchmarks were written in a
+// different style using B.N. For example:
+//
+//	func BenchmarkRandInt(b *testing.B) {
+//	    for range b.N {
+//	        rand.Int()
+//	    }
+//	}
+//
+// In this style of benchmark, the benchmark function must run
+// the target code b.N times. The benchmark function is called
+// multiple times with b.N adjusted until the benchmark function
+// lasts long enough to be timed reliably. This also means any setup
+// done before the loop may be run several times.
+//
+// If a benchmark needs some expensive setup before running, the timer
+// should be explicitly reset:
+//
+//	func BenchmarkBigLen(b *testing.B) {
+//	    big := NewBig()
+//	    b.ResetTimer()
+//	    for range b.N {
+//	        big.Len()
+//	    }
+//	}
+//
+// New benchmarks should prefer using [B.Loop], which is more robust
+// and more efficient.
+//
 // # Examples
 //
 // The package also runs and verifies example code. Example functions may
@@ -371,6 +399,7 @@ package testing
 
 import (
 	"bytes"
+	"context"
 	"errors"
 	"flag"
 	"fmt"
@@ -379,6 +408,7 @@ import (
 	"io"
 	"math/rand"
 	"os"
+	"path/filepath"
 	"reflect"
 	"runtime"
 	"runtime/debug"
@@ -632,6 +662,9 @@ type common struct {
 	tempDir    string
 	tempDirErr error
 	tempDirSeq int32
+
+	ctx       context.Context
+	cancelCtx context.CancelFunc
 }
 
 // Short reports whether the -test.short flag is set.
@@ -891,11 +924,13 @@ type TB interface {
 	Logf(format string, args ...any)
 	Name() string
 	Setenv(key, value string)
+	Chdir(dir string)
 	Skip(args ...any)
 	SkipNow()
 	Skipf(format string, args ...any)
 	Skipped() bool
 	TempDir() string
+	Context() context.Context
 
 	// A private method to prevent users implementing the
 	// interface and so future additions to it will not
@@ -917,8 +952,8 @@ var _ TB = (*B)(nil)
 // may be called simultaneously from multiple goroutines.
 type T struct {
 	common
-	isEnvSet bool
-	context  *testContext // For running tests and subtests.
+	denyParallel bool
+	tstate       *testState // For running tests and subtests.
 }
 
 func (c *common) private() {}
@@ -1307,6 +1342,58 @@ func (c *common) Setenv(key, value string) {
 	}
 }
 
+// Chdir calls os.Chdir(dir) and uses Cleanup to restore the current
+// working directory to its original value after the test. On Unix, it
+// also sets PWD environment variable for the duration of the test.
+//
+// Because Chdir affects the whole process, it cannot be used
+// in parallel tests or tests with parallel ancestors.
+func (c *common) Chdir(dir string) {
+	c.checkFuzzFn("Chdir")
+	oldwd, err := os.Open(".")
+	if err != nil {
+		c.Fatal(err)
+	}
+	if err := os.Chdir(dir); err != nil {
+		c.Fatal(err)
+	}
+	// On POSIX platforms, PWD represents “an absolute pathname of the
+	// current working directory.” Since we are changing the working
+	// directory, we should also set or update PWD to reflect that.
+	switch runtime.GOOS {
+	case "windows", "plan9":
+		// Windows and Plan 9 do not use the PWD variable.
+	default:
+		if !filepath.IsAbs(dir) {
+			dir, err = os.Getwd()
+			if err != nil {
+				c.Fatal(err)
+			}
+		}
+		c.Setenv("PWD", dir)
+	}
+	c.Cleanup(func() {
+		err := oldwd.Chdir()
+		oldwd.Close()
+		if err != nil {
+			// It's not safe to continue with tests if we can't
+			// get back to the original working directory. Since
+			// we are holding a dirfd, this is highly unlikely.
+			panic("testing.Chdir: " + err.Error())
+		}
+	})
+}
+
+// Context returns a context that is canceled just before
+// Cleanup-registered functions are called.
+//
+// Cleanup functions can wait for any resources
+// that shut down on Context.Done before the test or benchmark completes.
+func (c *common) Context() context.Context {
+	c.checkFuzzFn("Context")
+	return c.ctx
+}
+
 // panicHandling controls the panic handling used by runCleanup.
 type panicHandling int
 
@@ -1339,6 +1426,10 @@ func (c *common) runCleanup(ph panicHandling) (panicVal any) {
 		}
 	}()
 
+	if c.cancelCtx != nil {
+		c.cancelCtx()
+	}
+
 	for {
 		var cleanup func()
 		c.mu.Lock()
@@ -1436,6 +1527,8 @@ func pcToName(pc uintptr) string {
 	return frame.Function
 }
 
+const parallelConflict = `testing: test using t.Setenv or t.Chdir can not use t.Parallel`
+
 // Parallel signals that this test is to be run in parallel with (and only with)
 // other parallel tests. When a test is run multiple times due to use of
 // -test.count or -test.cpu, multiple instances of a single test never run in
@@ -1444,8 +1537,8 @@ func (t *T) Parallel() {
 	if t.isParallel {
 		panic("testing: t.Parallel called multiple times")
 	}
-	if t.isEnvSet {
-		panic("testing: t.Parallel called after t.Setenv; cannot set environment variables in parallel tests")
+	if t.denyParallel {
+		panic(parallelConflict)
 	}
 	t.isParallel = true
 	if t.parent.barrier == nil {
@@ -1482,7 +1575,7 @@ func (t *T) Parallel() {
 
 	t.signal <- true   // Release calling test.
 	<-t.parent.barrier // Wait for the parent test to complete.
-	t.context.waitParallel()
+	t.tstate.waitParallel()
 
 	if t.chatty != nil {
 		t.chatty.Updatef(t.name, "=== CONT  %s\n", t.name)
@@ -1500,6 +1593,21 @@ func (t *T) Parallel() {
 	t.lastRaceErrors.Store(int64(race.Errors()))
 }
 
+func (t *T) checkParallel() {
+	// Non-parallel subtests that have parallel ancestors may still
+	// run in parallel with other tests: they are only non-parallel
+	// with respect to the other subtests of the same parent.
+	// Since calls like SetEnv or Chdir affects the whole process, we need
+	// to deny those if the current test or any parent is parallel.
+	for c := &t.common; c != nil; c = c.parent {
+		if c.isParallel {
+			panic(parallelConflict)
+		}
+	}
+
+	t.denyParallel = true
+}
+
 // Setenv calls os.Setenv(key, value) and uses Cleanup to
 // restore the environment variable to its original value
 // after the test.
@@ -1507,27 +1615,21 @@ func (t *T) Parallel() {
 // Because Setenv affects the whole process, it cannot be used
 // in parallel tests or tests with parallel ancestors.
 func (t *T) Setenv(key, value string) {
-	// Non-parallel subtests that have parallel ancestors may still
-	// run in parallel with other tests: they are only non-parallel
-	// with respect to the other subtests of the same parent.
-	// Since SetEnv affects the whole process, we need to disallow it
-	// if the current test or any parent is parallel.
-	isParallel := false
-	for c := &t.common; c != nil; c = c.parent {
-		if c.isParallel {
-			isParallel = true
-			break
-		}
-	}
-	if isParallel {
-		panic("testing: t.Setenv called after t.Parallel; cannot set environment variables in parallel tests")
-	}
-
-	t.isEnvSet = true
-
+	t.checkParallel()
 	t.common.Setenv(key, value)
 }
 
+// Chdir calls os.Chdir(dir) and uses Cleanup to restore the current
+// working directory to its original value after the test. On Unix, it
+// also sets PWD environment variable for the duration of the test.
+//
+// Because Chdir affects the whole process, it cannot be used
+// in parallel tests or tests with parallel ancestors.
+func (t *T) Chdir(dir string) {
+	t.checkParallel()
+	t.common.Chdir(dir)
+}
+
 // InternalTest is an internal type but exported because it is cross-package;
 // it is part of the implementation of the "go test" command.
 type InternalTest struct {
@@ -1583,7 +1685,7 @@ func tRunner(t *T, fn func(t *T)) {
 			}
 		}
 
-		if err != nil && t.context.isFuzzing {
+		if err != nil && t.tstate.isFuzzing {
 			prefix := "panic: "
 			if err == errNilPanicOrGoexit {
 				prefix = ""
@@ -1641,7 +1743,7 @@ func tRunner(t *T, fn func(t *T)) {
 			// Run parallel subtests.
 
 			// Decrease the running count for this test and mark it as no longer running.
-			t.context.release()
+			t.tstate.release()
 			running.Delete(t.name)
 
 			// Release the parallel subtests.
@@ -1663,12 +1765,12 @@ func tRunner(t *T, fn func(t *T)) {
 			t.checkRaces()
 			if !t.isParallel {
 				// Reacquire the count for sequential tests. See comment in Run.
-				t.context.waitParallel()
+				t.tstate.waitParallel()
 			}
 		} else if t.isParallel {
 			// Only release the count for this test if it was run as a parallel
 			// test. See comment in Run method.
-			t.context.release()
+			t.tstate.release()
 		}
 		t.report() // Report after all subtests have finished.
 
@@ -1707,7 +1809,7 @@ func (t *T) Run(name string, f func(t *T)) bool {
 	}
 
 	t.hasSub.Store(true)
-	testName, ok, _ := t.context.match.fullName(&t.common, name)
+	testName, ok, _ := t.tstate.match.fullName(&t.common, name)
 	if !ok || shouldFailFast() {
 		return true
 	}
@@ -1716,17 +1818,23 @@ func (t *T) Run(name string, f func(t *T)) bool {
 	// continue walking the stack into the parent test.
 	var pc [maxStackLen]uintptr
 	n := runtime.Callers(2, pc[:])
+
+	// There's no reason to inherit this context from parent. The user's code can't observe
+	// the difference between the background context and the one from the parent test.
+	ctx, cancelCtx := context.WithCancel(context.Background())
 	t = &T{
 		common: common{
-			barrier: make(chan bool),
-			signal:  make(chan bool, 1),
-			name:    testName,
-			parent:  &t.common,
-			level:   t.level + 1,
-			creator: pc[:n],
-			chatty:  t.chatty,
+			barrier:   make(chan bool),
+			signal:    make(chan bool, 1),
+			name:      testName,
+			parent:    &t.common,
+			level:     t.level + 1,
+			creator:   pc[:n],
+			chatty:    t.chatty,
+			ctx:       ctx,
+			cancelCtx: cancelCtx,
 		},
-		context: t.context,
+		tstate: t.tstate,
 	}
 	t.w = indenter{&t.common}
 
@@ -1765,17 +1873,17 @@ func (t *T) Run(name string, f func(t *T)) bool {
 //
 // The ok result is false if the -timeout flag indicates “no timeout” (0).
 func (t *T) Deadline() (deadline time.Time, ok bool) {
-	deadline = t.context.deadline
+	deadline = t.tstate.deadline
 	return deadline, !deadline.IsZero()
 }
 
-// testContext holds all fields that are common to all tests. This includes
+// testState holds all fields that are common to all tests. This includes
 // synchronization primitives to run at most *parallel tests.
-type testContext struct {
+type testState struct {
 	match    *matcher
 	deadline time.Time
 
-	// isFuzzing is true in the context used when generating random inputs
+	// isFuzzing is true in the state used when generating random inputs
 	// for fuzz targets. isFuzzing is false when running normal tests and
 	// when running fuzz tests as unit tests (without -fuzz or when -fuzz
 	// does not match).
@@ -1797,8 +1905,8 @@ type testContext struct {
 	maxParallel int
 }
 
-func newTestContext(maxParallel int, m *matcher) *testContext {
-	return &testContext{
+func newTestState(maxParallel int, m *matcher) *testState {
+	return &testState{
 		match:         m,
 		startParallel: make(chan bool),
 		maxParallel:   maxParallel,
@@ -1806,28 +1914,28 @@ func newTestContext(maxParallel int, m *matcher) *testContext {
 	}
 }
 
-func (c *testContext) waitParallel() {
-	c.mu.Lock()
-	if c.running < c.maxParallel {
-		c.running++
-		c.mu.Unlock()
+func (s *testState) waitParallel() {
+	s.mu.Lock()
+	if s.running < s.maxParallel {
+		s.running++
+		s.mu.Unlock()
 		return
 	}
-	c.numWaiting++
-	c.mu.Unlock()
-	<-c.startParallel
+	s.numWaiting++
+	s.mu.Unlock()
+	<-s.startParallel
 }
 
-func (c *testContext) release() {
-	c.mu.Lock()
-	if c.numWaiting == 0 {
-		c.running--
-		c.mu.Unlock()
+func (s *testState) release() {
+	s.mu.Lock()
+	if s.numWaiting == 0 {
+		s.running--
+		s.mu.Unlock()
 		return
 	}
-	c.numWaiting--
-	c.mu.Unlock()
-	c.startParallel <- true // Pick a waiting test to be run.
+	s.numWaiting--
+	s.mu.Unlock()
+	s.startParallel <- true // Pick a waiting test to be run.
 }
 
 // No one should be using func Main anymore.
@@ -2150,15 +2258,18 @@ func runTests(matchString func(pat, str string) (bool, error), tests []InternalT
 				// to keep trying.
 				break
 			}
-			ctx := newTestContext(*parallel, newMatcher(matchString, *match, "-test.run", *skip))
-			ctx.deadline = deadline
+			ctx, cancelCtx := context.WithCancel(context.Background())
+			tstate := newTestState(*parallel, newMatcher(matchString, *match, "-test.run", *skip))
+			tstate.deadline = deadline
 			t := &T{
 				common: common{
-					signal:  make(chan bool, 1),
-					barrier: make(chan bool),
-					w:       os.Stdout,
+					signal:    make(chan bool, 1),
+					barrier:   make(chan bool),
+					w:         os.Stdout,
+					ctx:       ctx,
+					cancelCtx: cancelCtx,
 				},
-				context: ctx,
+				tstate: tstate,
 			}
 			if Verbose() {
 				t.chatty = newChattyPrinter(t.w)
diff --git a/src/testing/testing_test.go b/src/testing/testing_test.go
index 4a930395..797728c7 100644
--- a/src/testing/testing_test.go
+++ b/src/testing/testing_test.go
@@ -6,6 +6,8 @@ package testing_test
 
 import (
 	"bytes"
+	"context"
+	"errors"
 	"fmt"
 	"internal/race"
 	"internal/testenv"
@@ -13,6 +15,7 @@ import (
 	"os/exec"
 	"path/filepath"
 	"regexp"
+	"runtime"
 	"slices"
 	"strings"
 	"sync"
@@ -200,64 +203,177 @@ func TestSetenv(t *testing.T) {
 	}
 }
 
-func TestSetenvWithParallelAfterSetenv(t *testing.T) {
-	defer func() {
-		want := "testing: t.Parallel called after t.Setenv; cannot set environment variables in parallel tests"
-		if got := recover(); got != want {
-			t.Fatalf("expected panic; got %#v want %q", got, want)
-		}
-	}()
+func expectParallelConflict(t *testing.T) {
+	want := testing.ParallelConflict
+	if got := recover(); got != want {
+		t.Fatalf("expected panic; got %#v want %q", got, want)
+	}
+}
 
-	t.Setenv("GO_TEST_KEY_1", "value")
+func testWithParallelAfter(t *testing.T, fn func(*testing.T)) {
+	defer expectParallelConflict(t)
 
+	fn(t)
 	t.Parallel()
 }
 
-func TestSetenvWithParallelBeforeSetenv(t *testing.T) {
-	defer func() {
-		want := "testing: t.Setenv called after t.Parallel; cannot set environment variables in parallel tests"
-		if got := recover(); got != want {
-			t.Fatalf("expected panic; got %#v want %q", got, want)
-		}
-	}()
+func testWithParallelBefore(t *testing.T, fn func(*testing.T)) {
+	defer expectParallelConflict(t)
 
 	t.Parallel()
-
-	t.Setenv("GO_TEST_KEY_1", "value")
+	fn(t)
 }
 
-func TestSetenvWithParallelParentBeforeSetenv(t *testing.T) {
+func testWithParallelParentBefore(t *testing.T, fn func(*testing.T)) {
 	t.Parallel()
 
 	t.Run("child", func(t *testing.T) {
-		defer func() {
-			want := "testing: t.Setenv called after t.Parallel; cannot set environment variables in parallel tests"
-			if got := recover(); got != want {
-				t.Fatalf("expected panic; got %#v want %q", got, want)
-			}
-		}()
+		defer expectParallelConflict(t)
 
-		t.Setenv("GO_TEST_KEY_1", "value")
+		fn(t)
 	})
 }
 
-func TestSetenvWithParallelGrandParentBeforeSetenv(t *testing.T) {
+func testWithParallelGrandParentBefore(t *testing.T, fn func(*testing.T)) {
 	t.Parallel()
 
 	t.Run("child", func(t *testing.T) {
 		t.Run("grand-child", func(t *testing.T) {
-			defer func() {
-				want := "testing: t.Setenv called after t.Parallel; cannot set environment variables in parallel tests"
-				if got := recover(); got != want {
-					t.Fatalf("expected panic; got %#v want %q", got, want)
-				}
-			}()
+			defer expectParallelConflict(t)
 
-			t.Setenv("GO_TEST_KEY_1", "value")
+			fn(t)
 		})
 	})
 }
 
+func tSetenv(t *testing.T) {
+	t.Setenv("GO_TEST_KEY_1", "value")
+}
+
+func TestSetenvWithParallelAfter(t *testing.T) {
+	testWithParallelAfter(t, tSetenv)
+}
+
+func TestSetenvWithParallelBefore(t *testing.T) {
+	testWithParallelBefore(t, tSetenv)
+}
+
+func TestSetenvWithParallelParentBefore(t *testing.T) {
+	testWithParallelParentBefore(t, tSetenv)
+}
+
+func TestSetenvWithParallelGrandParentBefore(t *testing.T) {
+	testWithParallelGrandParentBefore(t, tSetenv)
+}
+
+func tChdir(t *testing.T) {
+	t.Chdir(t.TempDir())
+}
+
+func TestChdirWithParallelAfter(t *testing.T) {
+	testWithParallelAfter(t, tChdir)
+}
+
+func TestChdirWithParallelBefore(t *testing.T) {
+	testWithParallelBefore(t, tChdir)
+}
+
+func TestChdirWithParallelParentBefore(t *testing.T) {
+	testWithParallelParentBefore(t, tChdir)
+}
+
+func TestChdirWithParallelGrandParentBefore(t *testing.T) {
+	testWithParallelGrandParentBefore(t, tChdir)
+}
+
+func TestChdir(t *testing.T) {
+	oldDir, err := os.Getwd()
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.Chdir(oldDir)
+
+	// The "relative" test case relies on tmp not being a symlink.
+	tmp, err := filepath.EvalSymlinks(t.TempDir())
+	if err != nil {
+		t.Fatal(err)
+	}
+	rel, err := filepath.Rel(oldDir, tmp)
+	if err != nil {
+		// If GOROOT is on C: volume and tmp is on the D: volume, there
+		// is no relative path between them, so skip that test case.
+		rel = "skip"
+	}
+
+	for _, tc := range []struct {
+		name, dir, pwd string
+		extraChdir     bool
+	}{
+		{
+			name: "absolute",
+			dir:  tmp,
+			pwd:  tmp,
+		},
+		{
+			name: "relative",
+			dir:  rel,
+			pwd:  tmp,
+		},
+		{
+			name: "current (absolute)",
+			dir:  oldDir,
+			pwd:  oldDir,
+		},
+		{
+			name: "current (relative) with extra os.Chdir",
+			dir:  ".",
+			pwd:  oldDir,
+
+			extraChdir: true,
+		},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			if tc.dir == "skip" {
+				t.Skipf("skipping test because there is no relative path between %s and %s", oldDir, tmp)
+			}
+			if !filepath.IsAbs(tc.pwd) {
+				t.Fatalf("Bad tc.pwd: %q (must be absolute)", tc.pwd)
+			}
+
+			t.Chdir(tc.dir)
+
+			newDir, err := os.Getwd()
+			if err != nil {
+				t.Fatal(err)
+			}
+			if newDir != tc.pwd {
+				t.Fatalf("failed to chdir to %q: getwd: got %q, want %q", tc.dir, newDir, tc.pwd)
+			}
+
+			switch runtime.GOOS {
+			case "windows", "plan9":
+				// Windows and Plan 9 do not use the PWD variable.
+			default:
+				if pwd := os.Getenv("PWD"); pwd != tc.pwd {
+					t.Fatalf("PWD: got %q, want %q", pwd, tc.pwd)
+				}
+			}
+
+			if tc.extraChdir {
+				os.Chdir("..")
+			}
+		})
+
+		newDir, err := os.Getwd()
+		if err != nil {
+			t.Fatal(err)
+		}
+		if newDir != oldDir {
+			t.Fatalf("failed to restore wd to %s: getwd: %s", oldDir, newDir)
+		}
+	}
+}
+
 // testingTrueInInit is part of TestTesting.
 var testingTrueInInit = false
 
@@ -324,12 +440,7 @@ func runTest(t *testing.T, test string) []byte {
 
 	testenv.MustHaveExec(t)
 
-	exe, err := os.Executable()
-	if err != nil {
-		t.Skipf("can't find test executable: %v", err)
-	}
-
-	cmd := testenv.Command(t, exe, "-test.run=^"+test+"$", "-test.bench="+test, "-test.v", "-test.parallel=2", "-test.benchtime=2x")
+	cmd := testenv.Command(t, testenv.Executable(t), "-test.run=^"+test+"$", "-test.bench="+test, "-test.v", "-test.parallel=2", "-test.benchtime=2x")
 	cmd = testenv.CleanCmdEnv(cmd)
 	cmd.Env = append(cmd.Env, "GO_WANT_HELPER_PROCESS=1")
 	out, err := cmd.CombinedOutput()
@@ -558,14 +669,7 @@ func TestRaceBeforeParallel(t *testing.T) {
 }
 
 func TestRaceBeforeTests(t *testing.T) {
-	testenv.MustHaveExec(t)
-
-	exe, err := os.Executable()
-	if err != nil {
-		t.Skipf("can't find test executable: %v", err)
-	}
-
-	cmd := testenv.Command(t, exe, "-test.run=^$")
+	cmd := testenv.Command(t, testenv.Executable(t), "-test.run=^$")
 	cmd = testenv.CleanCmdEnv(cmd)
 	cmd.Env = append(cmd.Env, "GO_WANT_RACE_BEFORE_TESTS=1")
 	out, _ := cmd.CombinedOutput()
@@ -596,6 +700,20 @@ func TestBenchmarkRace(t *testing.T) {
 	}
 }
 
+func TestBenchmarkRaceBLoop(t *testing.T) {
+	out := runTest(t, "BenchmarkBLoopRacy")
+	c := bytes.Count(out, []byte("race detected during execution of test"))
+
+	want := 0
+	// We should see one race detector report.
+	if race.Enabled {
+		want = 1
+	}
+	if c != want {
+		t.Errorf("got %d race reports; want %d", c, want)
+	}
+}
+
 func BenchmarkRacy(b *testing.B) {
 	if os.Getenv("GO_WANT_HELPER_PROCESS") != "1" {
 		b.Skipf("skipping intentionally-racy benchmark")
@@ -605,15 +723,25 @@ func BenchmarkRacy(b *testing.B) {
 	}
 }
 
+func BenchmarkBLoopRacy(b *testing.B) {
+	if os.Getenv("GO_WANT_HELPER_PROCESS") != "1" {
+		b.Skipf("skipping intentionally-racy benchmark")
+	}
+	for b.Loop() {
+		doRace()
+	}
+}
+
 func TestBenchmarkSubRace(t *testing.T) {
 	out := runTest(t, "BenchmarkSubRacy")
 	c := bytes.Count(out, []byte("race detected during execution of test"))
 
 	want := 0
-	// We should see two race detector reports:
-	// one in the sub-bencmark, and one in the parent afterward.
+	// We should see 3 race detector reports:
+	// one in the sub-bencmark, one in the parent afterward,
+	// and one in b.Loop.
 	if race.Enabled {
-		want = 2
+		want = 3
 	}
 	if c != want {
 		t.Errorf("got %d race reports; want %d", c, want)
@@ -639,6 +767,12 @@ func BenchmarkSubRacy(b *testing.B) {
 		}
 	})
 
+	b.Run("racy-bLoop", func(b *testing.B) {
+		for b.Loop() {
+			doRace()
+		}
+	})
+
 	doRace() // should be reported separately
 }
 
@@ -813,3 +947,85 @@ func TestParentRun(t1 *testing.T) {
 		})
 	})
 }
+
+func TestContext(t *testing.T) {
+	ctx := t.Context()
+	if err := ctx.Err(); err != nil {
+		t.Fatalf("expected non-canceled context, got %v", err)
+	}
+
+	var innerCtx context.Context
+	t.Run("inner", func(t *testing.T) {
+		innerCtx = t.Context()
+		if err := innerCtx.Err(); err != nil {
+			t.Fatalf("expected inner test to not inherit canceled context, got %v", err)
+		}
+	})
+	t.Run("inner2", func(t *testing.T) {
+		if !errors.Is(innerCtx.Err(), context.Canceled) {
+			t.Fatal("expected context of sibling test to be canceled after its test function finished")
+		}
+	})
+
+	t.Cleanup(func() {
+		if !errors.Is(ctx.Err(), context.Canceled) {
+			t.Fatal("expected context canceled before cleanup")
+		}
+	})
+}
+
+func TestBenchmarkBLoopIterationCorrect(t *testing.T) {
+	out := runTest(t, "BenchmarkBLoopPrint")
+	c := bytes.Count(out, []byte("Printing from BenchmarkBLoopPrint"))
+
+	want := 2
+	if c != want {
+		t.Errorf("got %d loop iterations; want %d", c, want)
+	}
+
+	// b.Loop() will only rampup once.
+	c = bytes.Count(out, []byte("Ramping up from BenchmarkBLoopPrint"))
+	want = 1
+	if c != want {
+		t.Errorf("got %d loop rampup; want %d", c, want)
+	}
+
+	re := regexp.MustCompile(`BenchmarkBLoopPrint(-[0-9]+)?\s+2\s+[0-9]+\s+ns/op`)
+	if !re.Match(out) {
+		t.Error("missing benchmark output")
+	}
+}
+
+func TestBenchmarkBNIterationCorrect(t *testing.T) {
+	out := runTest(t, "BenchmarkBNPrint")
+	c := bytes.Count(out, []byte("Printing from BenchmarkBNPrint"))
+
+	// runTest sets benchtime=2x, with semantics specified in #32051 it should
+	// run 3 times.
+	want := 3
+	if c != want {
+		t.Errorf("got %d loop iterations; want %d", c, want)
+	}
+
+	// b.N style fixed iteration loop will rampup twice:
+	// One in run1(), the other in launch
+	c = bytes.Count(out, []byte("Ramping up from BenchmarkBNPrint"))
+	want = 2
+	if c != want {
+		t.Errorf("got %d loop rampup; want %d", c, want)
+	}
+}
+
+func BenchmarkBLoopPrint(b *testing.B) {
+	b.Logf("Ramping up from BenchmarkBLoopPrint")
+	for b.Loop() {
+		b.Logf("Printing from BenchmarkBLoopPrint")
+	}
+}
+
+func BenchmarkBNPrint(b *testing.B) {
+	b.Logf("Ramping up from BenchmarkBNPrint")
+	for i := 0; i < b.N; i++ {
+		b.Logf("Printing from BenchmarkBNPrint")
+	}
+}
diff --git a/src/text/template/doc.go b/src/text/template/doc.go
index b3ffaabb..7b63bb76 100644
--- a/src/text/template/doc.go
+++ b/src/text/template/doc.go
@@ -98,7 +98,8 @@ data, defined in detail in the corresponding sections that follow.
 			{{if pipeline}} T1 {{else}}{{if pipeline}} T0 {{end}}{{end}}
 
 	{{range pipeline}} T1 {{end}}
-		The value of the pipeline must be an array, slice, map, or channel.
+		The value of the pipeline must be an array, slice, map, iter.Seq,
+		iter.Seq2, integer or channel.
 		If the value of the pipeline has length zero, nothing is output;
 		otherwise, dot is set to the successive elements of the array,
 		slice, or map and T1 is executed. If the value is a map and the
@@ -106,7 +107,8 @@ data, defined in detail in the corresponding sections that follow.
 		visited in sorted key order.
 
 	{{range pipeline}} T1 {{else}} T0 {{end}}
-		The value of the pipeline must be an array, slice, map, or channel.
+		The value of the pipeline must be an array, slice, map, iter.Seq,
+		iter.Seq2, integer or channel.
 		If the value of the pipeline has length zero, dot is unaffected and
 		T0 is executed; otherwise, dot is set to the successive elements
 		of the array, slice, or map and T1 is executed.
@@ -162,37 +164,55 @@ An argument is a simple value, denoted by one of the following.
 	  the host machine's ints are 32 or 64 bits.
 	- The keyword nil, representing an untyped Go nil.
 	- The character '.' (period):
+
 		.
+
 	  The result is the value of dot.
 	- A variable name, which is a (possibly empty) alphanumeric string
 	  preceded by a dollar sign, such as
+
 		$piOver2
+
 	  or
+
 		$
+
 	  The result is the value of the variable.
 	  Variables are described below.
 	- The name of a field of the data, which must be a struct, preceded
 	  by a period, such as
+
 		.Field
+
 	  The result is the value of the field. Field invocations may be
 	  chained:
+
 	    .Field1.Field2
+
 	  Fields can also be evaluated on variables, including chaining:
+
 	    $x.Field1.Field2
 	- The name of a key of the data, which must be a map, preceded
 	  by a period, such as
+
 		.Key
+
 	  The result is the map element value indexed by the key.
 	  Key invocations may be chained and combined with fields to any
 	  depth:
+
 	    .Field1.Key1.Field2.Key2
+
 	  Although the key must be an alphanumeric identifier, unlike with
 	  field names they do not need to start with an upper case letter.
 	  Keys can also be evaluated on variables, including chaining:
+
 	    $x.key1.key2
 	- The name of a niladic method of the data, preceded by a period,
 	  such as
+
 		.Method
+
 	  The result is the value of invoking the method with dot as the
 	  receiver, dot.Method(). Such a method must have one return value (of
 	  any type) or two return values, the second of which is an error.
@@ -200,16 +220,22 @@ An argument is a simple value, denoted by one of the following.
 	  and an error is returned to the caller as the value of Execute.
 	  Method invocations may be chained and combined with fields and keys
 	  to any depth:
+
 	    .Field1.Key1.Method1.Field2.Key2.Method2
+
 	  Methods can also be evaluated on variables, including chaining:
+
 	    $x.Method1.Field
 	- The name of a niladic function, such as
+
 		fun
+
 	  The result is the value of invoking the function, fun(). The return
 	  types and values behave as in methods. Functions and function
 	  names are described below.
 	- A parenthesized instance of one the above, for grouping. The result
 	  may be accessed by a field or map key invocation.
+
 		print (.F1 arg1) (.F2 arg2)
 		(.StructValuedMethod "arg").Field
 
diff --git a/src/text/template/exec.go b/src/text/template/exec.go
index 5b35b3e5..ed6ae436 100644
--- a/src/text/template/exec.go
+++ b/src/text/template/exec.go
@@ -395,6 +395,22 @@ func (s *state) walkRange(dot reflect.Value, r *parse.RangeNode) {
 		s.walk(elem, r.List)
 	}
 	switch val.Kind() {
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64,
+		reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
+		if len(r.Pipe.Decl) > 1 {
+			s.errorf("can't use %v to iterate over more than one variable", val)
+			break
+		}
+		run := false
+		for v := range val.Seq() {
+			run = true
+			// Pass element as second value, as we do for channels.
+			oneIteration(reflect.Value{}, v)
+		}
+		if !run {
+			break
+		}
+		return
 	case reflect.Array, reflect.Slice:
 		if val.Len() == 0 {
 			break
@@ -434,6 +450,43 @@ func (s *state) walkRange(dot reflect.Value, r *parse.RangeNode) {
 		return
 	case reflect.Invalid:
 		break // An invalid value is likely a nil map, etc. and acts like an empty map.
+	case reflect.Func:
+		if val.Type().CanSeq() {
+			if len(r.Pipe.Decl) > 1 {
+				s.errorf("can't use %v iterate over more than one variable", val)
+				break
+			}
+			run := false
+			for v := range val.Seq() {
+				run = true
+				// Pass element as second value,
+				// as we do for channels.
+				oneIteration(reflect.Value{}, v)
+			}
+			if !run {
+				break
+			}
+			return
+		}
+		if val.Type().CanSeq2() {
+			run := false
+			for i, v := range val.Seq2() {
+				run = true
+				if len(r.Pipe.Decl) > 1 {
+					oneIteration(i, v)
+				} else {
+					// If there is only one range variable,
+					// oneIteration will use the
+					// second value.
+					oneIteration(reflect.Value{}, i)
+				}
+			}
+			if !run {
+				break
+			}
+			return
+		}
+		fallthrough
 	default:
 		s.errorf("range can't iterate over %v", val)
 	}
@@ -757,7 +810,7 @@ func (s *state) evalCall(dot, fun reflect.Value, isBuiltin bool, node parse.Node
 				return v
 			}
 		}
-		if final != missingVal {
+		if !final.Equal(missingVal) {
 			// The last argument to and/or is coming from
 			// the pipeline. We didn't short circuit on an earlier
 			// argument, so we are going to return this one.
@@ -803,7 +856,13 @@ func (s *state) evalCall(dot, fun reflect.Value, isBuiltin bool, node parse.Node
 	// Special case for the "call" builtin.
 	// Insert the name of the callee function as the first argument.
 	if isBuiltin && name == "call" {
-		calleeName := args[0].String()
+		var calleeName string
+		if len(args) == 0 {
+			// final must be present or we would have errored out above.
+			calleeName = final.String()
+		} else {
+			calleeName = args[0].String()
+		}
 		argv = append([]reflect.Value{reflect.ValueOf(calleeName)}, argv...)
 		fun = reflect.ValueOf(call)
 	}
diff --git a/src/text/template/exec_test.go b/src/text/template/exec_test.go
index 9903e17d..03ec9d75 100644
--- a/src/text/template/exec_test.go
+++ b/src/text/template/exec_test.go
@@ -10,6 +10,7 @@ import (
 	"flag"
 	"fmt"
 	"io"
+	"iter"
 	"reflect"
 	"strings"
 	"sync"
@@ -399,6 +400,9 @@ var execTests = []execTest{
 	{"Interface Call", `{{stringer .S}}`, "foozle", map[string]any{"S": bytes.NewBufferString("foozle")}, true},
 	{".ErrFunc", "{{call .ErrFunc}}", "bla", tVal, true},
 	{"call nil", "{{call nil}}", "", tVal, false},
+	{"empty call", "{{call}}", "", tVal, false},
+	{"empty call after pipe valid", "{{.ErrFunc | call}}", "bla", tVal, true},
+	{"empty call after pipe invalid", "{{1 | call}}", "", tVal, false},
 
 	// Erroneous function calls (check args).
 	{".BinaryFuncTooFew", "{{call .BinaryFunc `1`}}", "", tVal, false},
@@ -601,6 +605,30 @@ var execTests = []execTest{
 	{"declare in range", "{{range $x := .PSI}}<{{$foo:=$x}}{{$x}}>{{end}}", "<21><22><23>", tVal, true},
 	{"range count", `{{range $i, $x := count 5}}[{{$i}}]{{$x}}{{end}}`, "[0]a[1]b[2]c[3]d[4]e", tVal, true},
 	{"range nil count", `{{range $i, $x := count 0}}{{else}}empty{{end}}`, "empty", tVal, true},
+	{"range iter.Seq[int]", `{{range $i := .}}{{$i}}{{end}}`, "01", fVal1(2), true},
+	{"i = range iter.Seq[int]", `{{$i := 0}}{{range $i = .}}{{$i}}{{end}}`, "01", fVal1(2), true},
+	{"range iter.Seq[int] over two var", `{{range $i, $c := .}}{{$c}}{{end}}`, "", fVal1(2), false},
+	{"i, c := range iter.Seq2[int,int]", `{{range $i, $c := .}}{{$i}}{{$c}}{{end}}`, "0112", fVal2(2), true},
+	{"i, c = range iter.Seq2[int,int]", `{{$i := 0}}{{$c := 0}}{{range $i, $c = .}}{{$i}}{{$c}}{{end}}`, "0112", fVal2(2), true},
+	{"i = range iter.Seq2[int,int]", `{{$i := 0}}{{range $i = .}}{{$i}}{{end}}`, "01", fVal2(2), true},
+	{"i := range iter.Seq2[int,int]", `{{range $i := .}}{{$i}}{{end}}`, "01", fVal2(2), true},
+	{"i,c,x range iter.Seq2[int,int]", `{{$i := 0}}{{$c := 0}}{{$x := 0}}{{range $i, $c = .}}{{$i}}{{$c}}{{end}}`, "0112", fVal2(2), true},
+	{"i,x range iter.Seq[int]", `{{$i := 0}}{{$x := 0}}{{range $i = .}}{{$i}}{{end}}`, "01", fVal1(2), true},
+	{"range iter.Seq[int] else", `{{range $i := .}}{{$i}}{{else}}empty{{end}}`, "empty", fVal1(0), true},
+	{"range iter.Seq2[int,int] else", `{{range $i := .}}{{$i}}{{else}}empty{{end}}`, "empty", fVal2(0), true},
+	{"range int8", rangeTestInt, rangeTestData[int8](), int8(5), true},
+	{"range int16", rangeTestInt, rangeTestData[int16](), int16(5), true},
+	{"range int32", rangeTestInt, rangeTestData[int32](), int32(5), true},
+	{"range int64", rangeTestInt, rangeTestData[int64](), int64(5), true},
+	{"range int", rangeTestInt, rangeTestData[int](), int(5), true},
+	{"range uint8", rangeTestInt, rangeTestData[uint8](), uint8(5), true},
+	{"range uint16", rangeTestInt, rangeTestData[uint16](), uint16(5), true},
+	{"range uint32", rangeTestInt, rangeTestData[uint32](), uint32(5), true},
+	{"range uint64", rangeTestInt, rangeTestData[uint64](), uint64(5), true},
+	{"range uint", rangeTestInt, rangeTestData[uint](), uint(5), true},
+	{"range uintptr", rangeTestInt, rangeTestData[uintptr](), uintptr(5), true},
+	{"range uintptr(0)", `{{range $v := .}}{{print $v}}{{else}}empty{{end}}`, "empty", uintptr(0), true},
+	{"range 5", `{{range $v := 5}}{{printf "%T%d" $v $v}}{{end}}`, rangeTestData[int](), nil, true},
 
 	// Cute examples.
 	{"or as if true", `{{or .SI "slice is empty"}}`, "[3 4 5]", tVal, true},
@@ -705,6 +733,37 @@ var execTests = []execTest{
 	{"issue60801", "{{$k := 0}}{{$v := 0}}{{range $k, $v = .AI}}{{$k}}={{$v}} {{end}}", "0=3 1=4 2=5 ", tVal, true},
 }
 
+func fVal1(i int) iter.Seq[int] {
+	return func(yield func(int) bool) {
+		for v := range i {
+			if !yield(v) {
+				break
+			}
+		}
+	}
+}
+
+func fVal2(i int) iter.Seq2[int, int] {
+	return func(yield func(int, int) bool) {
+		for v := range i {
+			if !yield(v, v+1) {
+				break
+			}
+		}
+	}
+}
+
+const rangeTestInt = `{{range $v := .}}{{printf "%T%d" $v $v}}{{end}}`
+
+func rangeTestData[T int | int8 | int16 | int32 | int64 | uint | uint8 | uint16 | uint32 | uint64 | uintptr]() string {
+	I := T(5)
+	var buf strings.Builder
+	for i := T(0); i < I; i++ {
+		fmt.Fprintf(&buf, "%T%d", i, i)
+	}
+	return buf.String()
+}
+
 func zeroArgs() string {
 	return "zeroArgs"
 }
diff --git a/src/text/template/parse/lex.go b/src/text/template/parse/lex.go
index 70fc86b6..a00f48e6 100644
--- a/src/text/template/parse/lex.go
+++ b/src/text/template/parse/lex.go
@@ -352,6 +352,7 @@ func lexComment(l *lexer) stateFn {
 	if !delim {
 		return l.errorf("comment ends before closing delimiter")
 	}
+	l.line += strings.Count(l.input[l.start:l.pos], "\n")
 	i := l.thisItem(itemComment)
 	if trimSpace {
 		l.pos += trimMarkerLen
diff --git a/src/text/template/parse/lex_test.go b/src/text/template/parse/lex_test.go
index d47f10f9..20f9698f 100644
--- a/src/text/template/parse/lex_test.go
+++ b/src/text/template/parse/lex_test.go
@@ -545,6 +545,16 @@ var lexPosTests = []lexTest{
 		{itemRightDelim, 11, "}}", 2},
 		{itemEOF, 13, "", 2},
 	}},
+	{"longcomment", "{{/*\n*/}}\n{{undefinedFunction \"test\"}}", []item{
+		{itemComment, 2, "/*\n*/", 1},
+		{itemText, 9, "\n", 2},
+		{itemLeftDelim, 10, "{{", 3},
+		{itemIdentifier, 12, "undefinedFunction", 3},
+		{itemSpace, 29, " ", 3},
+		{itemString, 30, "\"test\"", 3},
+		{itemRightDelim, 36, "}}", 3},
+		{itemEOF, 38, "", 3},
+	}},
 }
 
 // The other tests don't check position, to make the test cases easier to construct.
diff --git a/src/text/template/template.go b/src/text/template/template.go
index 86fd3f12..78067af2 100644
--- a/src/text/template/template.go
+++ b/src/text/template/template.go
@@ -5,6 +5,7 @@
 package template
 
 import (
+	"maps"
 	"reflect"
 	"sync"
 	"text/template/parse"
@@ -102,12 +103,8 @@ func (t *Template) Clone() (*Template, error) {
 	}
 	t.muFuncs.RLock()
 	defer t.muFuncs.RUnlock()
-	for k, v := range t.parseFuncs {
-		nt.parseFuncs[k] = v
-	}
-	for k, v := range t.execFuncs {
-		nt.execFuncs[k] = v
-	}
+	maps.Copy(nt.parseFuncs, t.parseFuncs)
+	maps.Copy(nt.execFuncs, t.execFuncs)
 	return nt, nil
 }
 
diff --git a/src/time/abs_test.go b/src/time/abs_test.go
new file mode 100644
index 00000000..61d093a3
--- /dev/null
+++ b/src/time/abs_test.go
@@ -0,0 +1,183 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package time
+
+type testingT interface {
+	Error(args ...any)
+	Errorf(format string, args ...any)
+	Fail()
+	FailNow()
+	Failed() bool
+	Fatal(args ...any)
+	Fatalf(format string, args ...any)
+	Helper()
+	Log(args ...any)
+	Logf(format string, args ...any)
+	Skip(args ...any)
+	SkipNow()
+	Skipf(format string, args ...any)
+}
+
+var InternalTests = []struct {
+	Name string
+	Test func(testingT)
+}{
+	{"AbsDaysSplit", testAbsDaysSplit},
+	{"AbsYdaySplit", testAbsYdaySplit},
+	{"AbsDate", testAbsDate},
+	{"DateToAbsDays", testDateToAbsDays},
+	{"DaysIn", testDaysIn},
+	{"DaysBefore", testDaysBefore},
+}
+
+func testAbsDaysSplit(t testingT) {
+	isLeap := func(year uint64) bool {
+		return year%4 == 0 && (year%100 != 0 || year%400 == 0)
+	}
+	bad := 0
+	wantYear := uint64(0)
+	wantYday := absYday(0)
+	for days := range absDays(1e6) {
+		century, cyear, yday := days.split()
+		if century != absCentury(wantYear/100) || cyear != absCyear(wantYear%100) || yday != wantYday {
+			t.Errorf("absDays(%d).split() = %d, %d, %d, want %d, %d, %d",
+				days, century, cyear, yday,
+				wantYear/100, wantYear%100, wantYday)
+			if bad++; bad >= 20 {
+				t.Fatalf("too many errors")
+			}
+		}
+		end := absYday(365)
+		if isLeap(wantYear + 1) {
+			end = 366
+		}
+		if wantYday++; wantYday == end {
+			wantYear++
+			wantYday = 0
+		}
+	}
+}
+
+func testAbsYdaySplit(t testingT) {
+	ends := []int{31, 30, 31, 30, 31, 31, 30, 31, 30, 31, 31, 29}
+	bad := 0
+	wantMonth := absMonth(3)
+	wantDay := 1
+	for yday := range absYday(366) {
+		month, day := yday.split()
+		if month != wantMonth || day != wantDay {
+			t.Errorf("absYday(%d).split() = %d, %d, want %d, %d", yday, month, day, wantMonth, wantDay)
+			if bad++; bad >= 20 {
+				t.Fatalf("too many errors")
+			}
+		}
+		if wantDay++; wantDay > ends[wantMonth-3] {
+			wantMonth++
+			wantDay = 1
+		}
+	}
+}
+
+func testAbsDate(t testingT) {
+	ends := []int{31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}
+	isLeap := func(year int) bool {
+		y := uint64(year) + absoluteYears
+		return y%4 == 0 && (y%100 != 0 || y%400 == 0)
+	}
+	wantYear := 0
+	wantMonth := March
+	wantMday := 1
+	wantYday := 31 + 29 + 1
+	bad := 0
+	absoluteYears := int64(absoluteYears)
+	for days := range absDays(1e6) {
+		year, month, mday := days.date()
+		year += int(absoluteYears)
+		if year != wantYear || month != wantMonth || mday != wantMday {
+			t.Errorf("days(%d).date() = %v, %v, %v, want %v, %v, %v", days,
+				year, month, mday,
+				wantYear, wantMonth, wantMday)
+			if bad++; bad >= 20 {
+				t.Fatalf("too many errors")
+			}
+		}
+
+		year, yday := days.yearYday()
+		year += int(absoluteYears)
+		if year != wantYear || yday != wantYday {
+			t.Errorf("days(%d).yearYday() = %v, %v, want %v, %v, ", days,
+				year, yday,
+				wantYear, wantYday)
+			if bad++; bad >= 20 {
+				t.Fatalf("too many errors")
+			}
+		}
+
+		if wantMday++; wantMday == ends[wantMonth-1]+1 || wantMonth == February && wantMday == 29 && !isLeap(year) {
+			wantMonth++
+			wantMday = 1
+		}
+		wantYday++
+		if wantMonth == December+1 {
+			wantYear++
+			wantMonth = January
+			wantMday = 1
+			wantYday = 1
+		}
+	}
+}
+
+func testDateToAbsDays(t testingT) {
+	isLeap := func(year int64) bool {
+		return year%4 == 0 && (year%100 != 0 || year%400 == 0)
+	}
+	wantDays := absDays(marchThruDecember)
+	bad := 0
+	for year := int64(1); year < 10000; year++ {
+		days := dateToAbsDays(year-absoluteYears, January, 1)
+		if days != wantDays {
+			t.Errorf("dateToAbsDays(abs %d, Jan, 1) = %d, want %d", year, days, wantDays)
+			if bad++; bad >= 20 {
+				t.Fatalf("too many errors")
+			}
+		}
+		wantDays += 365
+		if isLeap(year) {
+			wantDays++
+		}
+	}
+}
+
+func testDaysIn(t testingT) {
+	isLeap := func(year int) bool {
+		return year%4 == 0 && (year%100 != 0 || year%400 == 0)
+	}
+	want := []int{0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}
+	bad := 0
+	for year := 0; year <= 1600; year++ {
+		for m := January; m <= December; m++ {
+			w := want[m]
+			if m == February && isLeap(year) {
+				w++
+			}
+			d := daysIn(m, year-800)
+			if d != w {
+				t.Errorf("daysIn(%v, %d) = %d, want %d", m, year-800, d, w)
+				if bad++; bad >= 20 {
+					t.Fatalf("too many errors")
+				}
+			}
+		}
+	}
+}
+
+func testDaysBefore(t testingT) {
+	for m, want := range []int{0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365} {
+		d := daysBefore(Month(m + 1))
+		if d != want {
+			t.Errorf("daysBefore(%d) = %d, want %d", m, d, want)
+		}
+	}
+}
diff --git a/src/time/example_test.go b/src/time/example_test.go
index 53c20a05..2c9601c6 100644
--- a/src/time/example_test.go
+++ b/src/time/example_test.go
@@ -6,6 +6,7 @@ package time_test
 
 import (
 	"fmt"
+	"math"
 	"time"
 )
 
@@ -108,6 +109,39 @@ func ExampleParseDuration() {
 	// There are 1.00e-06 seconds in 1µs.
 }
 
+func ExampleSince() {
+	start := time.Now()
+	expensiveCall()
+	elapsed := time.Since(start)
+	fmt.Printf("The call took %v to run.\n", elapsed)
+}
+
+func ExampleUntil() {
+	futureTime := time.Now().Add(5 * time.Second)
+	durationUntil := time.Until(futureTime)
+	fmt.Printf("Duration until future time: %.0f seconds", math.Ceil(durationUntil.Seconds()))
+	// Output: Duration until future time: 5 seconds
+}
+
+func ExampleDuration_Abs() {
+	positiveDuration := 5 * time.Second
+	negativeDuration := -3 * time.Second
+	minInt64CaseDuration := time.Duration(math.MinInt64)
+
+	absPositive := positiveDuration.Abs()
+	absNegative := negativeDuration.Abs()
+	absSpecial := minInt64CaseDuration.Abs() == time.Duration(math.MaxInt64)
+
+	fmt.Printf("Absolute value of positive duration: %v\n", absPositive)
+	fmt.Printf("Absolute value of negative duration: %v\n", absNegative)
+	fmt.Printf("Absolute value of MinInt64 equal to MaxInt64: %t\n", absSpecial)
+
+	// Output:
+	// Absolute value of positive duration: 5s
+	// Absolute value of negative duration: 3s
+	// Absolute value of MinInt64 equal to MaxInt64: true
+}
+
 func ExampleDuration_Hours() {
 	h, _ := time.ParseDuration("4h30m")
 	fmt.Printf("I've got %.1f hours of work left.", h.Hours())
@@ -295,8 +329,8 @@ func ExampleTime_Format() {
 	// default format: 2015-02-25 11:06:39 -0800 PST
 	// Unix format: Wed Feb 25 11:06:39 PST 2015
 	// Same, in UTC: Wed Feb 25 19:06:39 UTC 2015
-	//in Shanghai with seconds: 2015-02-26T03:06:39 +080000
-	//in Shanghai with colon seconds: 2015-02-26T03:06:39 +08:00:00
+	// in Shanghai with seconds: 2015-02-26T03:06:39 +080000
+	// in Shanghai with colon seconds: 2015-02-26T03:06:39 +08:00:00
 	//
 	// Formats:
 	//
diff --git a/src/time/format.go b/src/time/format.go
index c9e68b3e..da1bac5a 100644
--- a/src/time/format.go
+++ b/src/time/format.go
@@ -140,7 +140,7 @@ const (
 	stdDay                                         // "2"
 	stdUnderDay                                    // "_2"
 	stdZeroDay                                     // "02"
-	stdUnderYearDay                                // "__2"
+	stdUnderYearDay          = iota + stdNeedYday  // "__2"
 	stdZeroYearDay                                 // "002"
 	stdHour                  = iota + stdNeedClock // "15"
 	stdHour12                                      // "3"
@@ -168,7 +168,8 @@ const (
 	stdFracSecond9                                 // ".9", ".99", ..., trailing zeros omitted
 
 	stdNeedDate       = 1 << 8             // need month, day, year
-	stdNeedClock      = 2 << 8             // need hour, minute, second
+	stdNeedYday       = 1 << 9             // need yday
+	stdNeedClock      = 1 << 10            // need hour, minute, second
 	stdArgShift       = 16                 // extra argument in high bits, above low stdArgShift
 	stdSeparatorShift = 28                 // extra argument in high 4 bits for fractional second separators
 	stdMask           = 1<= i+2 && layout[i+1] == '2' {
-				//_2006 is really a literal _, followed by stdLongYear
+				// _2006 is really a literal _, followed by stdLongYear
 				if len(layout) >= i+5 && layout[i+1:i+5] == "2006" {
 					return layout[0 : i+1], stdLongYear, layout[i+5:]
 				}
@@ -404,7 +405,7 @@ func match(s1, s2 string) bool {
 
 func lookup(tab []string, val string) (int, string, error) {
 	for i, v := range tab {
-		if len(val) >= len(v) && match(val[0:len(v)], v) {
+		if len(val) >= len(v) && match(val[:len(v)], v) {
 			return i, val[len(v):], nil
 		}
 	}
@@ -574,9 +575,9 @@ func (t Time) String() string {
 // GoString implements [fmt.GoStringer] and formats t to be printed in Go source
 // code.
 func (t Time) GoString() string {
-	abs := t.abs()
-	year, month, day, _ := absDate(abs, true)
-	hour, minute, second := absClock(abs)
+	abs := t.absSec()
+	year, month, day := abs.days().date()
+	hour, minute, second := abs.clock()
 
 	buf := make([]byte, 0, len("time.Date(9999, time.September, 31, 23, 59, 59, 999999999, time.Local)"))
 	buf = append(buf, "time.Date("...)
@@ -664,13 +665,14 @@ func (t Time) AppendFormat(b []byte, layout string) []byte {
 }
 
 func (t Time) appendFormat(b []byte, layout string) []byte {
-	var (
-		name, offset, abs = t.locabs()
+	name, offset, abs := t.locabs()
+	days := abs.days()
 
+	var (
 		year  int = -1
 		month Month
 		day   int
-		yday  int
+		yday  int = -1
 		hour  int = -1
 		min   int
 		sec   int
@@ -689,13 +691,15 @@ func (t Time) appendFormat(b []byte, layout string) []byte {
 
 		// Compute year, month, day if needed.
 		if year < 0 && std&stdNeedDate != 0 {
-			year, month, day, yday = absDate(abs, true)
-			yday++
+			year, month, day = days.date()
+		}
+		if yday < 0 && std&stdNeedYday != 0 {
+			_, yday = days.yearYday()
 		}
 
 		// Compute hour, minute, second if needed.
 		if hour < 0 && std&stdNeedClock != 0 {
-			hour, min, sec = absClock(abs)
+			hour, min, sec = abs.clock()
 		}
 
 		switch std & stdMask {
@@ -717,9 +721,9 @@ func (t Time) appendFormat(b []byte, layout string) []byte {
 		case stdZeroMonth:
 			b = appendInt(b, int(month), 2)
 		case stdWeekDay:
-			b = append(b, absWeekday(abs).String()[:3]...)
+			b = append(b, days.weekday().String()[:3]...)
 		case stdLongWeekDay:
-			s := absWeekday(abs).String()
+			s := days.weekday().String()
 			b = append(b, s...)
 		case stdDay:
 			b = appendInt(b, day, 0)
@@ -1255,9 +1259,9 @@ func parse(layout, value string, defaultLocation, local *Location) (Time, error)
 			hr, _, err = getnum(hour, true)
 			if err == nil {
 				mm, _, err = getnum(min, true)
-			}
-			if err == nil {
-				ss, _, err = getnum(seconds, true)
+				if err == nil {
+					ss, _, err = getnum(seconds, true)
+				}
 			}
 
 			// The range test use > rather than >=,
@@ -1350,10 +1354,10 @@ func parse(layout, value string, defaultLocation, local *Location) (Time, error)
 		}
 		if m == 0 {
 			m = (yday-1)/31 + 1
-			if int(daysBefore[m]) < yday {
+			if daysBefore(Month(m+1)) < yday {
 				m++
 			}
-			d = yday - int(daysBefore[m-1])
+			d = yday - daysBefore(Month(m))
 		}
 		// If month, day already seen, yday's m, d must match.
 		// Otherwise, set them from m, d.
diff --git a/src/time/format_rfc3339.go b/src/time/format_rfc3339.go
index 1151666c..05fddfca 100644
--- a/src/time/format_rfc3339.go
+++ b/src/time/format_rfc3339.go
@@ -19,7 +19,7 @@ func (t Time) appendFormatRFC3339(b []byte, nanos bool) []byte {
 	_, offset, abs := t.locabs()
 
 	// Format date.
-	year, month, day, _ := absDate(abs, true)
+	year, month, day := abs.days().date()
 	b = appendInt(b, year, 4)
 	b = append(b, '-')
 	b = appendInt(b, int(month), 2)
@@ -29,7 +29,7 @@ func (t Time) appendFormatRFC3339(b []byte, nanos bool) []byte {
 	b = append(b, 'T')
 
 	// Format time.
-	hour, min, sec := absClock(abs)
+	hour, min, sec := abs.clock()
 	b = appendInt(b, hour, 2)
 	b = append(b, ':')
 	b = appendInt(b, min, 2)
diff --git a/src/time/linkname_test.go b/src/time/linkname_test.go
new file mode 100644
index 00000000..3a47eaf3
--- /dev/null
+++ b/src/time/linkname_test.go
@@ -0,0 +1,41 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package time_test
+
+import (
+	"testing"
+	"time"
+	_ "unsafe" // for linkname
+)
+
+//go:linkname timeAbs time.Time.abs
+func timeAbs(time.Time) uint64
+
+//go:linkname absClock time.absClock
+func absClock(uint64) (hour, min, sec int)
+
+//go:linkname absDate time.absDate
+func absDate(uint64, bool) (year int, month time.Month, day int, yday int)
+
+func TestLinkname(t *testing.T) {
+	tm := time.Date(2006, time.January, 2, 15, 4, 5, 6, time.UTC)
+	abs := timeAbs(tm)
+	// wantAbs should be Jan 1 based, not Mar 1 based.
+	// See absolute time description in time.go.
+	const wantAbs = 9223372029851535845 // NOT 9223372029877973939
+	if abs != wantAbs {
+		t.Fatalf("timeAbs(2006-01-02 15:04:05 UTC) = %d, want %d", abs, uint64(wantAbs))
+	}
+
+	year, month, day, yday := absDate(abs, true)
+	if year != 2006 || month != time.January || day != 2 || yday != 1 {
+		t.Errorf("absDate() = %v, %v, %v, %v, want 2006, January, 2, 1", year, month, day, yday)
+	}
+
+	hour, min, sec := absClock(abs)
+	if hour != 15 || min != 4 || sec != 5 {
+		t.Errorf("absClock() = %v, %v, %v, 15, 4, 5", hour, min, sec)
+	}
+}
diff --git a/src/time/sleep.go b/src/time/sleep.go
index 7e2fa0c2..e9cd483b 100644
--- a/src/time/sleep.go
+++ b/src/time/sleep.go
@@ -165,8 +165,8 @@ func NewTimer(d Duration) *Timer {
 // to receive a time value corresponding to the previous timer settings;
 // if the program has not received from t.C already and the timer is
 // running, Reset is guaranteed to return true.
-// Before Go 1.23, the only safe way to use Reset was to [Stop] and
-// explicitly drain the timer first.
+// Before Go 1.23, the only safe way to use Reset was to call [Timer.Stop]
+// and explicitly drain the timer first.
 // See the [NewTimer] documentation for more details.
 func (t *Timer) Reset(d Duration) bool {
 	if !t.initTimer {
@@ -180,7 +180,7 @@ func (t *Timer) Reset(d Duration) bool {
 func sendTime(c any, seq uintptr, delta int64) {
 	// delta is how long ago the channel send was supposed to happen.
 	// The current time can be arbitrarily far into the future, because the runtime
-	// can delay a sendTime call until a goroutines tries to receive from
+	// can delay a sendTime call until a goroutine tries to receive from
 	// the channel. Subtract delta to go back to the old time that we
 	// used to send.
 	select {
diff --git a/src/time/tick_test.go b/src/time/tick_test.go
index fce9002c..416bef59 100644
--- a/src/time/tick_test.go
+++ b/src/time/tick_test.go
@@ -462,7 +462,7 @@ func testTimerChan(t *testing.T, tim timer, C <-chan Time, synctimerchan bool) {
 		tim.Reset(1)
 		Sleep(sched)
 		if l, c := len(C), cap(C); l != 0 || c != 0 {
-			//t.Fatalf("len(C), cap(C) = %d, %d, want 0, 0", l, c)
+			// t.Fatalf("len(C), cap(C) = %d, %d, want 0, 0", l, c)
 		}
 		assertTick()
 	} else {
diff --git a/src/time/time.go b/src/time/time.go
index 43efe4b1..14e79672 100644
--- a/src/time/time.go
+++ b/src/time/time.go
@@ -54,8 +54,8 @@
 // On some systems the monotonic clock will stop if the computer goes to sleep.
 // On such a system, t.Sub(u) may not accurately reflect the actual
 // time that passed between t and u. The same applies to other functions and
-// methods that subtract times, such as [Since], [Until], [Before], [After],
-// [Add], [Sub], [Equal] and [Compare]. In some cases, you may need to strip
+// methods that subtract times, such as [Since], [Until], [Time.Before], [Time.After],
+// [Time.Add], [Time.Equal] and [Time.Compare]. In some cases, you may need to strip
 // the monotonic clock to get accurate results.
 //
 // Because the monotonic clock reading has no meaning outside
@@ -92,6 +92,7 @@ package time
 
 import (
 	"errors"
+	"math/bits"
 	_ "unsafe" // for go:linkname
 )
 
@@ -118,9 +119,9 @@ import (
 // these methods does not change the actual instant it represents, only the time
 // zone in which to interpret it.
 //
-// Representations of a Time value saved by the [Time.GobEncode], [Time.MarshalBinary],
-// [Time.MarshalJSON], and [Time.MarshalText] methods store the [Time.Location]'s offset, but not
-// the location name. They therefore lose information about Daylight Saving Time.
+// Representations of a Time value saved by the [Time.GobEncode], [Time.MarshalBinary], [Time.AppendBinary],
+// [Time.MarshalJSON], [Time.MarshalText] and [Time.AppendText] methods store the [Time.Location]'s offset,
+// but not the location name. They therefore lose information about Daylight Saving Time.
 //
 // In addition to the required “wall clock” reading, a Time may contain an optional
 // reading of the current process's monotonic clock, to provide additional precision
@@ -256,6 +257,12 @@ func (t *Time) mono() int64 {
 	return t.ext
 }
 
+// IsZero reports whether t represents the zero time instant,
+// January 1, year 1, 00:00:00 UTC.
+func (t Time) IsZero() bool {
+	return t.sec() == 0 && t.nsec() == 0
+}
+
 // After reports whether the time instant t is after u.
 func (t Time) After(u Time) bool {
 	if t.wall&u.wall&hasMonotonic != 0 {
@@ -360,7 +367,7 @@ func (d Weekday) String() string {
 	return "%!Weekday(" + string(buf[n:]) + ")"
 }
 
-// Computations on time.
+// Computations on Times
 //
 // The zero value for a Time is defined to be
 //	January 1, year 1, 00:00:00.000000000 UTC
@@ -406,22 +413,22 @@ func (d Weekday) String() string {
 //
 // The calendar runs on an exact 400 year cycle: a 400-year calendar
 // printed for 1970-2369 will apply as well to 2370-2769. Even the days
-// of the week match up. It simplifies the computations to choose the
+// of the week match up. It simplifies date computations to choose the
 // cycle boundaries so that the exceptional years are always delayed as
-// long as possible. That means choosing a year equal to 1 mod 400, so
-// that the first leap year is the 4th year, the first missed leap year
-// is the 100th year, and the missed missed leap year is the 400th year.
-// So we'd prefer instead to print a calendar for 2001-2400 and reuse it
-// for 2401-2800.
+// long as possible: March 1, year 0 is such a day:
+// the first leap day (Feb 29) is four years minus one day away,
+// the first multiple-of-4 year without a Feb 29 is 100 years minus one day away,
+// and the first multiple-of-100 year with a Feb 29 is 400 years minus one day away.
+// March 1 year Y for any Y = 0 mod 400 is also such a day.
 //
 // Finally, it's convenient if the delta between the Unix epoch and
 // long-ago epoch is representable by an int64 constant.
 //
 // These three considerations—choose an epoch as early as possible, that
-// uses a year equal to 1 mod 400, and that is no more than 2⁶³ seconds
-// earlier than 1970—bring us to the year -292277022399. We refer to
-// this year as the absolute zero year, and to times measured as a uint64
-// seconds since this year as absolute times.
+// starts on March 1 of a year equal to 0 mod 400, and that is no more than
+// 2⁶³ seconds earlier than 1970—bring us to the year -292277022400.
+// We refer to this moment as the absolute zero instant, and to times
+// measured as a uint64 seconds since this year as absolute times.
 //
 // Times measured as an int64 seconds since the year 1—the representation
 // used for Time's sec field—are called internal times.
@@ -435,40 +442,327 @@ func (d Weekday) String() string {
 // west of UTC, since it is year 0. It doesn't seem tenable to say that
 // printing the zero time correctly isn't supported in half the time
 // zones. By comparison, it's reasonable to mishandle some times in
-// the year -292277022399.
+// the year -292277022400.
 //
 // All this is opaque to clients of the API and can be changed if a
 // better implementation presents itself.
+//
+// The date calculations are implemented using the following clever math from
+// Cassio Neri and Lorenz Schneider, “Euclidean affine functions and their
+// application to calendar algorithms,” SP&E 2023. https://doi.org/10.1002/spe.3172
+//
+// Define a “calendrical division” (f, f°, f*) to be a triple of functions converting
+// one time unit into a whole number of larger units and the remainder and back.
+// For example, in a calendar with no leap years, (d/365, d%365, y*365) is the
+// calendrical division for days into years:
+//
+//	(f)  year := days/365
+//	(f°) yday := days%365
+//	(f*) days := year*365 (+ yday)
+//
+// Note that f* is usually the “easy” function to write: it's the
+// calendrical multiplication that inverts the more complex division.
+//
+// Neri and Schneider prove that when f* takes the form
+//
+//	f*(n) = (a n + b) / c
+//
+// using integer division rounding down with a ≥ c > 0,
+// which they call a Euclidean affine function or EAF, then:
+//
+//	f(n) = (c n + c - b - 1) / a
+//	f°(n) = (c n + c - b - 1) % a / c
+//
+// This gives a fairly direct calculation for any calendrical division for which
+// we can write the calendrical multiplication in EAF form.
+// Because the epoch has been shifted to March 1, all the calendrical
+// multiplications turn out to be possible to write in EAF form.
+// When a date is broken into [century, cyear, amonth, mday],
+// with century, cyear, and mday 0-based,
+// and amonth 3-based (March = 3, ..., January = 13, February = 14),
+// the calendrical multiplications written in EAF form are:
+//
+//	yday = (153 (amonth-3) + 2) / 5 = (153 amonth - 457) / 5
+//	cday = 365 cyear + cyear/4 = 1461 cyear / 4
+//	centurydays = 36524 century + century/4 = 146097 century / 4
+//	days = centurydays + cday + yday + mday.
+//
+// We can only handle one periodic cycle per equation, so the year
+// calculation must be split into [century, cyear], handling both the
+// 100-year cycle and the 400-year cycle.
+//
+// The yday calculation is not obvious but derives from the fact
+// that the March through January calendar repeats the 5-month
+// 153-day cycle 31, 30, 31, 30, 31 (we don't care about February
+// because yday only ever count the days _before_ February 1,
+// since February is the last month).
+//
+// Using the rule for deriving f and f° from f*, these multiplications
+// convert to these divisions:
+//
+//	century := (4 days + 3) / 146097
+//	cdays := (4 days + 3) % 146097 / 4
+//	cyear := (4 cdays + 3) / 1461
+//	ayday := (4 cdays + 3) % 1461 / 4
+//	amonth := (5 ayday + 461) / 153
+//	mday := (5 ayday + 461) % 153 / 5
+//
+// The a in ayday and amonth stands for absolute (March 1-based)
+// to distinguish from the standard yday (January 1-based).
+//
+// After computing these, we can translate from the March 1 calendar
+// to the standard January 1 calendar with branch-free math assuming a
+// branch-free conversion from bool to int 0 or 1, denoted int(b) here:
+//
+//	isJanFeb := int(yday >= marchThruDecember)
+//	month := amonth - isJanFeb*12
+//	year := century*100 + cyear + isJanFeb
+//	isLeap := int(cyear%4 == 0) & (int(cyear != 0) | int(century%4 == 0))
+//	day := 1 + mday
+//	yday := 1 + ayday + 31 + 28 + isLeap&^isJanFeb - 365*isJanFeb
+//
+// isLeap is the standard leap-year rule, but the split year form
+// makes the divisions all reduce to binary masking.
+// Note that day and yday are 1-based, in contrast to mday and ayday.
 
+// To keep the various units separate, we define integer types
+// for each. These are never stored in interfaces nor allocated,
+// so their type information does not appear in Go binaries.
 const (
-	// The unsigned zero year for internal calculations.
-	// Must be 1 mod 400, and times before it will not compute correctly,
-	// but otherwise can be changed at will.
-	absoluteZeroYear = -292277022399
+	secondsPerMinute = 60
+	secondsPerHour   = 60 * secondsPerMinute
+	secondsPerDay    = 24 * secondsPerHour
+	secondsPerWeek   = 7 * secondsPerDay
+	daysPer400Years  = 365*400 + 97
+
+	// Days from March 1 through end of year
+	marchThruDecember = 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30 + 31
+
+	// absoluteYears is the number of years we subtract from internal time to get absolute time.
+	// This value must be 0 mod 400, and it defines the “absolute zero instant”
+	// mentioned in the “Computations on Times” comment above: March 1, -absoluteYears.
+	// Dates before the absolute epoch will not compute correctly,
+	// but otherwise the value can be changed as needed.
+	absoluteYears = 292277022400
 
 	// The year of the zero Time.
 	// Assumed by the unixToInternal computation below.
 	internalYear = 1
 
 	// Offsets to convert between internal and absolute or Unix times.
-	absoluteToInternal int64 = (absoluteZeroYear - internalYear) * 365.2425 * secondsPerDay
+	absoluteToInternal int64 = -(absoluteYears*365.2425 + marchThruDecember) * secondsPerDay
 	internalToAbsolute       = -absoluteToInternal
 
 	unixToInternal int64 = (1969*365 + 1969/4 - 1969/100 + 1969/400) * secondsPerDay
 	internalToUnix int64 = -unixToInternal
 
+	absoluteToUnix = absoluteToInternal + internalToUnix
+	unixToAbsolute = unixToInternal + internalToAbsolute
+
 	wallToInternal int64 = (1884*365 + 1884/4 - 1884/100 + 1884/400) * secondsPerDay
 )
 
-// IsZero reports whether t represents the zero time instant,
-// January 1, year 1, 00:00:00 UTC.
-func (t Time) IsZero() bool {
-	return t.sec() == 0 && t.nsec() == 0
+// An absSeconds counts the number of seconds since the absolute zero instant.
+type absSeconds uint64
+
+// An absDays counts the number of days since the absolute zero instant.
+type absDays uint64
+
+// An absCentury counts the number of centuries since the absolute zero instant.
+type absCentury uint64
+
+// An absCyear counts the number of years since the start of a century.
+type absCyear int
+
+// An absYday counts the number of days since the start of a year.
+// Note that absolute years start on March 1.
+type absYday int
+
+// An absMonth counts the number of months since the start of a year.
+// absMonth=0 denotes March.
+type absMonth int
+
+// An absLeap is a single bit (0 or 1) denoting whether a given year is a leap year.
+type absLeap int
+
+// An absJanFeb is a single bit (0 or 1) denoting whether a given day falls in January or February.
+// That is a special case because the absolute years start in March (unlike normal calendar years).
+type absJanFeb int
+
+// dateToAbsDays takes a standard year/month/day and returns the
+// number of days from the absolute epoch to that day.
+// The days argument can be out of range and in particular can be negative.
+func dateToAbsDays(year int64, month Month, day int) absDays {
+	// See “Computations on Times” comment above.
+	amonth := uint32(month)
+	janFeb := uint32(0)
+	if amonth < 3 {
+		janFeb = 1
+	}
+	amonth += 12 * janFeb
+	y := uint64(year) - uint64(janFeb) + absoluteYears
+
+	// For amonth is in the range [3,14], we want:
+	//
+	//	ayday := (153*amonth - 457) / 5
+	//
+	// (See the “Computations on Times” comment above
+	// as well as Neri and Schneider, section 7.)
+	//
+	// That is equivalent to:
+	//
+	//	ayday := (979*amonth - 2919) >> 5
+	//
+	// and the latter form uses a couple fewer instructions,
+	// so use it, saving a few cycles.
+	// See Neri and Schneider, section 8.3
+	// for more about this optimization.
+	//
+	// (Note that there is no saved division, because the compiler
+	// implements / 5 without division in all cases.)
+	ayday := (979*amonth - 2919) >> 5
+
+	century := y / 100
+	cyear := uint32(y % 100)
+	cday := 1461 * cyear / 4
+	centurydays := 146097 * century / 4
+
+	return absDays(centurydays + uint64(int64(cday+ayday)+int64(day)-1))
 }
 
-// abs returns the time t as an absolute time, adjusted by the zone offset.
+// days converts absolute seconds to absolute days.
+func (abs absSeconds) days() absDays {
+	return absDays(abs / secondsPerDay)
+}
+
+// split splits days into century, cyear, ayday.
+func (days absDays) split() (century absCentury, cyear absCyear, ayday absYday) {
+	// See “Computations on Times” comment above.
+	d := 4*uint64(days) + 3
+	century = absCentury(d / 146097)
+
+	// This should be
+	//	cday := uint32(d % 146097) / 4
+	//	cd := 4*cday + 3
+	// which is to say
+	//	cday := uint32(d % 146097) >> 2
+	//	cd := cday<<2 + 3
+	// but of course (x>>2<<2)+3 == x|3,
+	// so do that instead.
+	cd := uint32(d%146097) | 3
+
+	// For cdays in the range [0,146097] (100 years), we want:
+	//
+	//	cyear := (4 cdays + 3) / 1461
+	//	yday := (4 cdays + 3) % 1461 / 4
+	//
+	// (See the “Computations on Times” comment above
+	// as well as Neri and Schneider, section 7.)
+	//
+	// That is equivalent to:
+	//
+	//	cyear := (2939745 cdays) >> 32
+	//	yday := (2939745 cdays) & 0xFFFFFFFF / 2939745 / 4
+	//
+	// so do that instead, saving a few cycles.
+	// See Neri and Schneider, section 8.3
+	// for more about this optimization.
+	hi, lo := bits.Mul32(2939745, uint32(cd))
+	cyear = absCyear(hi)
+	ayday = absYday(lo / 2939745 / 4)
+	return
+}
+
+// split splits ayday into absolute month and standard (1-based) day-in-month.
+func (ayday absYday) split() (m absMonth, mday int) {
+	// See “Computations on Times” comment above.
+	//
+	// For yday in the range [0,366],
+	//
+	//	amonth := (5 yday + 461) / 153
+	//	mday := (5 yday + 461) % 153 / 5
+	//
+	// is equivalent to:
+	//
+	//	amonth = (2141 yday + 197913) >> 16
+	//	mday = (2141 yday + 197913) & 0xFFFF / 2141
+	//
+	// so do that instead, saving a few cycles.
+	// See Neri and Schneider, section 8.3.
+	d := 2141*uint32(ayday) + 197913
+	return absMonth(d >> 16), 1 + int((d&0xFFFF)/2141)
+}
+
+// janFeb returns 1 if the March 1-based ayday is in January or February, 0 otherwise.
+func (ayday absYday) janFeb() absJanFeb {
+	// See “Computations on Times” comment above.
+	jf := absJanFeb(0)
+	if ayday >= marchThruDecember {
+		jf = 1
+	}
+	return jf
+}
+
+// month returns the standard Month for (m, janFeb)
+func (m absMonth) month(janFeb absJanFeb) Month {
+	// See “Computations on Times” comment above.
+	return Month(m) - Month(janFeb)*12
+}
+
+// leap returns 1 if (century, cyear) is a leap year, 0 otherwise.
+func (century absCentury) leap(cyear absCyear) absLeap {
+	// See “Computations on Times” comment above.
+	y4ok := 0
+	if cyear%4 == 0 {
+		y4ok = 1
+	}
+	y100ok := 0
+	if cyear != 0 {
+		y100ok = 1
+	}
+	y400ok := 0
+	if century%4 == 0 {
+		y400ok = 1
+	}
+	return absLeap(y4ok & (y100ok | y400ok))
+}
+
+// year returns the standard year for (century, cyear, janFeb).
+func (century absCentury) year(cyear absCyear, janFeb absJanFeb) int {
+	// See “Computations on Times” comment above.
+	return int(uint64(century)*100-absoluteYears) + int(cyear) + int(janFeb)
+}
+
+// yday returns the standard 1-based yday for (ayday, janFeb, leap).
+func (ayday absYday) yday(janFeb absJanFeb, leap absLeap) int {
+	// See “Computations on Times” comment above.
+	return int(ayday) + (1 + 31 + 28) + int(leap)&^int(janFeb) - 365*int(janFeb)
+}
+
+// date converts days into standard year, month, day.
+func (days absDays) date() (year int, month Month, day int) {
+	century, cyear, ayday := days.split()
+	amonth, day := ayday.split()
+	janFeb := ayday.janFeb()
+	year = century.year(cyear, janFeb)
+	month = amonth.month(janFeb)
+	return
+}
+
+// yearYday converts days into the standard year and 1-based yday.
+func (days absDays) yearYday() (year, yday int) {
+	century, cyear, ayday := days.split()
+	janFeb := ayday.janFeb()
+	year = century.year(cyear, janFeb)
+	yday = ayday.yday(janFeb, century.leap(cyear))
+	return
+}
+
+// absSec returns the time t as an absolute seconds, adjusted by the zone offset.
 // It is called when computing a presentation property like Month or Hour.
-func (t Time) abs() uint64 {
+// We'd rather call it abs, but there are linknames to abs that make that problematic.
+// See timeAbs below.
+func (t Time) absSec() absSeconds {
 	l := t.loc
 	// Avoid function calls when possible.
 	if l == nil || l == &localLoc {
@@ -483,12 +777,12 @@ func (t Time) abs() uint64 {
 			sec += int64(offset)
 		}
 	}
-	return uint64(sec + (unixToInternal + internalToAbsolute))
+	return absSeconds(sec + (unixToInternal + internalToAbsolute))
 }
 
 // locabs is a combination of the Zone and abs methods,
 // extracting both return values from a single zone lookup.
-func (t Time) locabs() (name string, offset int, abs uint64) {
+func (t Time) locabs() (name string, offset int, abs absSeconds) {
 	l := t.loc
 	if l == nil || l == &localLoc {
 		l = l.get()
@@ -506,44 +800,45 @@ func (t Time) locabs() (name string, offset int, abs uint64) {
 	} else {
 		name = "UTC"
 	}
-	abs = uint64(sec + (unixToInternal + internalToAbsolute))
+	abs = absSeconds(sec + (unixToInternal + internalToAbsolute))
 	return
 }
 
 // Date returns the year, month, and day in which t occurs.
 func (t Time) Date() (year int, month Month, day int) {
-	year, month, day, _ = t.date(true)
-	return
+	return t.absSec().days().date()
 }
 
 // Year returns the year in which t occurs.
 func (t Time) Year() int {
-	year, _, _, _ := t.date(false)
-	return year
+	century, cyear, ayday := t.absSec().days().split()
+	janFeb := ayday.janFeb()
+	return century.year(cyear, janFeb)
 }
 
 // Month returns the month of the year specified by t.
 func (t Time) Month() Month {
-	_, month, _, _ := t.date(true)
-	return month
+	_, _, ayday := t.absSec().days().split()
+	amonth, _ := ayday.split()
+	return amonth.month(ayday.janFeb())
 }
 
 // Day returns the day of the month specified by t.
 func (t Time) Day() int {
-	_, _, day, _ := t.date(true)
+	_, _, ayday := t.absSec().days().split()
+	_, day := ayday.split()
 	return day
 }
 
 // Weekday returns the day of the week specified by t.
 func (t Time) Weekday() Weekday {
-	return absWeekday(t.abs())
+	return t.absSec().days().weekday()
 }
 
-// absWeekday is like Weekday but operates on an absolute time.
-func absWeekday(abs uint64) Weekday {
-	// January 1 of the absolute year, like January 1 of 2001, was a Monday.
-	sec := (abs + uint64(Monday)*secondsPerDay) % secondsPerWeek
-	return Weekday(int(sec) / secondsPerDay)
+// weekday returns the day of the week specified by days.
+func (days absDays) weekday() Weekday {
+	// March 1 of the absolute year, like March 1 of 2000, was a Wednesday.
+	return Weekday((uint64(days) + uint64(Wednesday)) % 7)
 }
 
 // ISOWeek returns the ISO 8601 year and week number in which t occurs.
@@ -561,35 +856,19 @@ func (t Time) ISOWeek() (year, week int) {
 	// 1      2       3         4        5      6        7
 	// +3     +2      +1        0        -1     -2       -3
 	// the offset to Thursday
-	abs := t.abs()
-	d := Thursday - absWeekday(abs)
-	// handle Sunday
-	if d == 4 {
-		d = -3
-	}
-	// find the Thursday of the calendar week
-	abs += uint64(d) * secondsPerDay
-	year, _, _, yday := absDate(abs, false)
-	return year, yday/7 + 1
+	days := t.absSec().days()
+	thu := days + absDays(Thursday-((days-1).weekday()+1))
+	year, yday := thu.yearYday()
+	return year, (yday-1)/7 + 1
 }
 
 // Clock returns the hour, minute, and second within the day specified by t.
 func (t Time) Clock() (hour, min, sec int) {
-	return absClock(t.abs())
+	return t.absSec().clock()
 }
 
-// absClock is like clock but operates on an absolute time.
-//
-// absClock should be an internal detail,
-// but widely used packages access it using linkname.
-// Notable members of the hall of shame include:
-//   - github.com/phuslu/log
-//
-// Do not remove or change the type signature.
-// See go.dev/issue/67401.
-//
-//go:linkname absClock
-func absClock(abs uint64) (hour, min, sec int) {
+// clock returns the hour, minute, and second within the day specified by abs.
+func (abs absSeconds) clock() (hour, min, sec int) {
 	sec = int(abs % secondsPerDay)
 	hour = sec / secondsPerHour
 	sec -= hour * secondsPerHour
@@ -600,17 +879,17 @@ func absClock(abs uint64) (hour, min, sec int) {
 
 // Hour returns the hour within the day specified by t, in the range [0, 23].
 func (t Time) Hour() int {
-	return int(t.abs()%secondsPerDay) / secondsPerHour
+	return int(t.absSec()%secondsPerDay) / secondsPerHour
 }
 
 // Minute returns the minute offset within the hour specified by t, in the range [0, 59].
 func (t Time) Minute() int {
-	return int(t.abs()%secondsPerHour) / secondsPerMinute
+	return int(t.absSec()%secondsPerHour) / secondsPerMinute
 }
 
 // Second returns the second offset within the minute specified by t, in the range [0, 59].
 func (t Time) Second() int {
-	return int(t.abs() % secondsPerMinute)
+	return int(t.absSec() % secondsPerMinute)
 }
 
 // Nanosecond returns the nanosecond offset within the second specified by t,
@@ -622,8 +901,8 @@ func (t Time) Nanosecond() int {
 // YearDay returns the day of the year specified by t, in the range [1,365] for non-leap years,
 // and [1,366] in leap years.
 func (t Time) YearDay() int {
-	_, _, _, yday := t.date(false)
-	return yday + 1
+	_, yday := t.absSec().days().yearYday()
+	return yday
 }
 
 // A Duration represents the elapsed time between two instants
@@ -870,7 +1149,8 @@ func (d Duration) Round(m Duration) Duration {
 }
 
 // Abs returns the absolute value of d.
-// As a special case, [math.MinInt64] is converted to [math.MaxInt64].
+// As a special case, Duration([math.MinInt64]) is converted to Duration([math.MaxInt64]),
+// reducing its magnitude by 1 nanosecond.
 func (d Duration) Abs() Duration {
 	switch {
 	case d >= 0:
@@ -981,167 +1261,68 @@ func (t Time) AddDate(years int, months int, days int) Time {
 	return Date(year+years, month+Month(months), day+days, hour, min, sec, int(t.nsec()), t.Location())
 }
 
-const (
-	secondsPerMinute = 60
-	secondsPerHour   = 60 * secondsPerMinute
-	secondsPerDay    = 24 * secondsPerHour
-	secondsPerWeek   = 7 * secondsPerDay
-	daysPer400Years  = 365*400 + 97
-	daysPer100Years  = 365*100 + 24
-	daysPer4Years    = 365*4 + 1
-)
-
-// date computes the year, day of year, and when full=true,
-// the month and day in which t occurs.
-func (t Time) date(full bool) (year int, month Month, day int, yday int) {
-	return absDate(t.abs(), full)
-}
-
-// absDate is like date but operates on an absolute time.
-//
-// absDate should be an internal detail,
-// but widely used packages access it using linkname.
-// Notable members of the hall of shame include:
-//   - github.com/phuslu/log
-//   - gitee.com/quant1x/gox
-//
-// Do not remove or change the type signature.
-// See go.dev/issue/67401.
-//
-//go:linkname absDate
-func absDate(abs uint64, full bool) (year int, month Month, day int, yday int) {
-	// Split into time and day.
-	d := abs / secondsPerDay
-
-	// Account for 400 year cycles.
-	n := d / daysPer400Years
-	y := 400 * n
-	d -= daysPer400Years * n
-
-	// Cut off 100-year cycles.
-	// The last cycle has one extra leap year, so on the last day
-	// of that year, day / daysPer100Years will be 4 instead of 3.
-	// Cut it back down to 3 by subtracting n>>2.
-	n = d / daysPer100Years
-	n -= n >> 2
-	y += 100 * n
-	d -= daysPer100Years * n
-
-	// Cut off 4-year cycles.
-	// The last cycle has a missing leap year, which does not
-	// affect the computation.
-	n = d / daysPer4Years
-	y += 4 * n
-	d -= daysPer4Years * n
-
-	// Cut off years within a 4-year cycle.
-	// The last year is a leap year, so on the last day of that year,
-	// day / 365 will be 4 instead of 3. Cut it back down to 3
-	// by subtracting n>>2.
-	n = d / 365
-	n -= n >> 2
-	y += n
-	d -= 365 * n
-
-	year = int(int64(y) + absoluteZeroYear)
-	yday = int(d)
-
-	if !full {
-		return
+// daysBefore returns the number of days in a non-leap year before month m.
+// daysBefore(December+1) returns 365.
+func daysBefore(m Month) int {
+	adj := 0
+	if m >= March {
+		adj = -2
 	}
 
-	day = yday
-	if isLeap(year) {
-		// Leap year
-		switch {
-		case day > 31+29-1:
-			// After leap day; pretend it wasn't there.
-			day--
-		case day == 31+29-1:
-			// Leap day.
-			month = February
-			day = 29
-			return
-		}
-	}
-
-	// Estimate month on assumption that every month has 31 days.
-	// The estimate may be too low by at most one month, so adjust.
-	month = Month(day / 31)
-	end := int(daysBefore[month+1])
-	var begin int
-	if day >= end {
-		month++
-		begin = end
-	} else {
-		begin = int(daysBefore[month])
-	}
-
-	month++ // because January is 1
-	day = day - begin + 1
-	return
-}
-
-// daysBefore[m] counts the number of days in a non-leap year
-// before month m begins. There is an entry for m=12, counting
-// the number of days before January of next year (365).
-var daysBefore = [...]int32{
-	0,
-	31,
-	31 + 28,
-	31 + 28 + 31,
-	31 + 28 + 31 + 30,
-	31 + 28 + 31 + 30 + 31,
-	31 + 28 + 31 + 30 + 31 + 30,
-	31 + 28 + 31 + 30 + 31 + 30 + 31,
-	31 + 28 + 31 + 30 + 31 + 30 + 31 + 31,
-	31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30,
-	31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31,
-	31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30,
-	31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30 + 31,
+	// With the -2 adjustment after February,
+	// we need to compute the running sum of:
+	//	0  31  30  31  30  31  30  31  31  30  31  30  31
+	// which is:
+	//	0  31  61  92 122 153 183 214 245 275 306 336 367
+	// This is almost exactly 367/12×(m-1) except for the
+	// occasonal off-by-one suggesting there may be an
+	// integer approximation of the form (a×m + b)/c.
+	// A brute force search over small a, b, c finds that
+	// (214×m - 211) / 7 computes the function perfectly.
+	return (214*int(m)-211)/7 + adj
 }
 
 func daysIn(m Month, year int) int {
-	if m == February && isLeap(year) {
-		return 29
+	if m == February {
+		if isLeap(year) {
+			return 29
+		}
+		return 28
 	}
-	return int(daysBefore[m] - daysBefore[m-1])
-}
-
-// daysSinceEpoch takes a year and returns the number of days from
-// the absolute epoch to the start of that year.
-// This is basically (year - zeroYear) * 365, but accounting for leap days.
-func daysSinceEpoch(year int) uint64 {
-	y := uint64(int64(year) - absoluteZeroYear)
-
-	// Add in days from 400-year cycles.
-	n := y / 400
-	y -= 400 * n
-	d := daysPer400Years * n
-
-	// Add in 100-year cycles.
-	n = y / 100
-	y -= 100 * n
-	d += daysPer100Years * n
-
-	// Add in 4-year cycles.
-	n = y / 4
-	y -= 4 * n
-	d += daysPer4Years * n
-
-	// Add in non-leap years.
-	n = y
-	d += 365 * n
-
-	return d
+	// With the special case of February eliminated, the pattern is
+	//	31 30 31 30 31 30 31 31 30 31 30 31
+	// Adding m&1 produces the basic alternation;
+	// adding (m>>3)&1 inverts the alternation starting in August.
+	return 30 + int((m+m>>3)&1)
 }
 
 // Provided by package runtime.
+//
+// now returns the current real time, and is superseded by runtimeNow which returns
+// the fake synctest clock when appropriate.
+//
+// now should be an internal detail,
+// but widely used packages access it using linkname.
+// Notable members of the hall of shame include:
+//   - gitee.com/quant1x/gox
+//   - github.com/phuslu/log
+//   - github.com/sethvargo/go-limiter
+//   - github.com/ulule/limiter/v3
+//
+// Do not remove or change the type signature.
+// See go.dev/issue/67401.
 func now() (sec int64, nsec int32, mono int64)
 
-// runtimeNano returns the current value of the runtime clock in nanoseconds.
+// runtimeNow returns the current time.
+// When called within a synctest.Run bubble, it returns the group's fake clock.
 //
-//go:linkname runtimeNano runtime.nanotime
+//go:linkname runtimeNow
+func runtimeNow() (sec int64, nsec int32, mono int64)
+
+// runtimeNano returns the current value of the runtime clock in nanoseconds.
+// When called within a synctest.Run bubble, it returns the group's fake clock.
+//
+//go:linkname runtimeNano
 func runtimeNano() int64
 
 // Monotonic times are reported as offsets from startNano.
@@ -1157,7 +1338,10 @@ var startNano int64 = runtimeNano() - 1
 
 // Now returns the current local time.
 func Now() Time {
-	sec, nsec, mono := now()
+	sec, nsec, mono := runtimeNow()
+	if mono == 0 {
+		return Time{uint64(nsec), sec + unixToInternal, Local}
+	}
 	mono -= startNano
 	sec += unixToInternal - minWall
 	if uint64(sec)>>33 != 0 {
@@ -1275,8 +1459,8 @@ const (
 	timeBinaryVersionV2                 // For LMT only
 )
 
-// MarshalBinary implements the encoding.BinaryMarshaler interface.
-func (t Time) MarshalBinary() ([]byte, error) {
+// AppendBinary implements the [encoding.BinaryAppender] interface.
+func (t Time) AppendBinary(b []byte) ([]byte, error) {
 	var offsetMin int16 // minutes east of UTC. -1 is UTC.
 	var offsetSec int8
 	version := timeBinaryVersionV1
@@ -1292,38 +1476,46 @@ func (t Time) MarshalBinary() ([]byte, error) {
 
 		offset /= 60
 		if offset < -32768 || offset == -1 || offset > 32767 {
-			return nil, errors.New("Time.MarshalBinary: unexpected zone offset")
+			return b, errors.New("Time.MarshalBinary: unexpected zone offset")
 		}
 		offsetMin = int16(offset)
 	}
 
 	sec := t.sec()
 	nsec := t.nsec()
-	enc := []byte{
-		version,         // byte 0 : version
-		byte(sec >> 56), // bytes 1-8: seconds
-		byte(sec >> 48),
-		byte(sec >> 40),
-		byte(sec >> 32),
-		byte(sec >> 24),
-		byte(sec >> 16),
-		byte(sec >> 8),
+	b = append(b,
+		version,       // byte 0 : version
+		byte(sec>>56), // bytes 1-8: seconds
+		byte(sec>>48),
+		byte(sec>>40),
+		byte(sec>>32),
+		byte(sec>>24),
+		byte(sec>>16),
+		byte(sec>>8),
 		byte(sec),
-		byte(nsec >> 24), // bytes 9-12: nanoseconds
-		byte(nsec >> 16),
-		byte(nsec >> 8),
+		byte(nsec>>24), // bytes 9-12: nanoseconds
+		byte(nsec>>16),
+		byte(nsec>>8),
 		byte(nsec),
-		byte(offsetMin >> 8), // bytes 13-14: zone offset in minutes
+		byte(offsetMin>>8), // bytes 13-14: zone offset in minutes
 		byte(offsetMin),
-	}
+	)
 	if version == timeBinaryVersionV2 {
-		enc = append(enc, byte(offsetSec))
+		b = append(b, byte(offsetSec))
 	}
-
-	return enc, nil
+	return b, nil
 }
 
-// UnmarshalBinary implements the encoding.BinaryUnmarshaler interface.
+// MarshalBinary implements the [encoding.BinaryMarshaler] interface.
+func (t Time) MarshalBinary() ([]byte, error) {
+	b, err := t.AppendBinary(make([]byte, 0, 16))
+	if err != nil {
+		return nil, err
+	}
+	return b, nil
+}
+
+// UnmarshalBinary implements the [encoding.BinaryUnmarshaler] interface.
 func (t *Time) UnmarshalBinary(data []byte) error {
 	buf := data
 	if len(buf) == 0 {
@@ -1385,7 +1577,7 @@ func (t *Time) GobDecode(data []byte) error {
 	return t.UnmarshalBinary(data)
 }
 
-// MarshalJSON implements the [json.Marshaler] interface.
+// MarshalJSON implements the [encoding/json.Marshaler] interface.
 // The time is a quoted string in the RFC 3339 format with sub-second precision.
 // If the timestamp cannot be represented as valid RFC 3339
 // (e.g., the year is out of range), then an error is reported.
@@ -1400,7 +1592,7 @@ func (t Time) MarshalJSON() ([]byte, error) {
 	return b, nil
 }
 
-// UnmarshalJSON implements the [json.Unmarshaler] interface.
+// UnmarshalJSON implements the [encoding/json.Unmarshaler] interface.
 // The time must be a quoted string in the RFC 3339 format.
 func (t *Time) UnmarshalJSON(data []byte) error {
 	if string(data) == "null" {
@@ -1416,19 +1608,30 @@ func (t *Time) UnmarshalJSON(data []byte) error {
 	return err
 }
 
-// MarshalText implements the [encoding.TextMarshaler] interface.
-// The time is formatted in RFC 3339 format with sub-second precision.
-// If the timestamp cannot be represented as valid RFC 3339
-// (e.g., the year is out of range), then an error is reported.
-func (t Time) MarshalText() ([]byte, error) {
-	b := make([]byte, 0, len(RFC3339Nano))
+func (t Time) appendTo(b []byte, errPrefix string) ([]byte, error) {
 	b, err := t.appendStrictRFC3339(b)
 	if err != nil {
-		return nil, errors.New("Time.MarshalText: " + err.Error())
+		return nil, errors.New(errPrefix + err.Error())
 	}
 	return b, nil
 }
 
+// AppendText implements the [encoding.TextAppender] interface.
+// The time is formatted in RFC 3339 format with sub-second precision.
+// If the timestamp cannot be represented as valid RFC 3339
+// (e.g., the year is out of range), then an error is returned.
+func (t Time) AppendText(b []byte) ([]byte, error) {
+	return t.appendTo(b, "Time.AppendText: ")
+}
+
+// MarshalText implements the [encoding.TextMarshaler] interface. The output
+// matches that of calling the [Time.AppendText] method.
+//
+// See [Time.AppendText] for more information.
+func (t Time) MarshalText() ([]byte, error) {
+	return t.appendTo(make([]byte, 0, len(RFC3339Nano)), "Time.MarshalText: ")
+}
+
 // UnmarshalText implements the [encoding.TextUnmarshaler] interface.
 // The time must be in the RFC 3339 format.
 func (t *Time) UnmarshalText(data []byte) error {
@@ -1474,7 +1677,15 @@ func (t Time) IsDST() bool {
 }
 
 func isLeap(year int) bool {
-	return year%4 == 0 && (year%100 != 0 || year%400 == 0)
+	// year%4 == 0 && (year%100 != 0 || year%400 == 0)
+	// Bottom 2 bits must be clear.
+	// For multiples of 25, bottom 4 bits must be clear.
+	// Thanks to Cassio Neri for this trick.
+	mask := 0xf
+	if year%25 != 0 {
+		mask = 3
+	}
+	return year&mask == 0
 }
 
 // norm returns nhi, nlo such that
@@ -1529,23 +1740,10 @@ func Date(year int, month Month, day, hour, min, sec, nsec int, loc *Location) T
 	hour, min = norm(hour, min, 60)
 	day, hour = norm(day, hour, 24)
 
-	// Compute days since the absolute epoch.
-	d := daysSinceEpoch(year)
-
-	// Add in days before this month.
-	d += uint64(daysBefore[month-1])
-	if isLeap(year) && month >= March {
-		d++ // February 29
-	}
-
-	// Add in days before today.
-	d += uint64(day - 1)
-
-	// Add in time elapsed today.
-	abs := d * secondsPerDay
-	abs += uint64(hour*secondsPerHour + min*secondsPerMinute + sec)
-
-	unix := int64(abs) + (absoluteToInternal + internalToUnix)
+	// Convert to absolute time and then Unix time.
+	unix := int64(dateToAbsDays(int64(year), month, day))*secondsPerDay +
+		int64(hour*secondsPerHour+min*secondsPerMinute+sec) +
+		absoluteToUnix
 
 	// Look for zone offset for expected time, so we can adjust to UTC.
 	// The lookup function expects UTC, so first we pass unix in the
@@ -1693,3 +1891,50 @@ func div(t Time, d Duration) (qmod2 int, r Duration) {
 	}
 	return
 }
+
+// Regrettable Linkname Compatibility
+//
+// timeAbs, absDate, and absClock mimic old internal details, no longer used.
+// Widely used packages linknamed these to get “faster” time routines.
+// Notable members of the hall of shame include:
+//   - gitee.com/quant1x/gox
+//   - github.com/phuslu/log
+//
+// phuslu hard-coded 'Unix time + 9223372028715321600' [sic]
+// as the input to absDate and absClock, using the old Jan 1-based
+// absolute times.
+// quant1x linknamed the time.Time.abs method and passed the
+// result of that method to absDate and absClock.
+//
+// Keeping both of these working forces us to provide these three
+// routines here, operating on the old Jan 1-based epoch instead
+// of the new March 1-based epoch. And the fact that time.Time.abs
+// was linknamed means that we have to call the current abs method
+// something different (time.Time.absSec, defined above) to make it
+// possible to provide this simulation of the old routines here.
+//
+// None of this code is linked into the binary if not referenced by
+// these linkname-happy packages. In particular, despite its name,
+// time.Time.abs does not appear in the time.Time method table.
+//
+// Do not remove these routines or their linknames, or change the
+// type signature or meaning of arguments.
+
+//go:linkname legacyTimeTimeAbs time.Time.abs
+func legacyTimeTimeAbs(t Time) uint64 {
+	return uint64(t.absSec() - marchThruDecember*secondsPerDay)
+}
+
+//go:linkname legacyAbsClock time.absClock
+func legacyAbsClock(abs uint64) (hour, min, sec int) {
+	return absSeconds(abs + marchThruDecember*secondsPerDay).clock()
+}
+
+//go:linkname legacyAbsDate time.absDate
+func legacyAbsDate(abs uint64, full bool) (year int, month Month, day int, yday int) {
+	d := absSeconds(abs + marchThruDecember*secondsPerDay).days()
+	year, month, day = d.date()
+	_, yday = d.yearYday()
+	yday-- // yearYday is 1-based, old API was 0-based
+	return
+}
diff --git a/src/time/time_test.go b/src/time/time_test.go
index c12b9117..ff253be4 100644
--- a/src/time/time_test.go
+++ b/src/time/time_test.go
@@ -22,6 +22,26 @@ import (
 	. "time"
 )
 
+func TestInternal(t *testing.T) {
+	for _, tt := range InternalTests {
+		t.Run(tt.Name, func(t *testing.T) { tt.Test(t) })
+	}
+}
+
+func TestZeroTime(t *testing.T) {
+	var zero Time
+	year, month, day := zero.Date()
+	hour, min, sec := zero.Clock()
+	nsec := zero.Nanosecond()
+	yday := zero.YearDay()
+	wday := zero.Weekday()
+	if year != 1 || month != January || day != 1 || hour != 0 || min != 0 || sec != 0 || nsec != 0 || yday != 1 || wday != Monday {
+		t.Errorf("zero time = %v %v %v year %v %02d:%02d:%02d.%09d yday %d want Monday Jan 1 year 1 00:00:00.000000000 yday 1",
+			wday, month, day, year, hour, min, sec, nsec, yday)
+	}
+
+}
+
 // We should be in PST/PDT, but if the time zone files are missing we
 // won't be. The purpose of this test is to at least explain why some of
 // the subsequent tests fail.
@@ -103,75 +123,75 @@ func same(t Time, u *parsedTime) bool {
 		t.Weekday() == u.Weekday
 }
 
-func TestSecondsToUTC(t *testing.T) {
+func TestUnixUTC(t *testing.T) {
 	for _, test := range utctests {
 		sec := test.seconds
 		golden := &test.golden
 		tm := Unix(sec, 0).UTC()
 		newsec := tm.Unix()
 		if newsec != sec {
-			t.Errorf("SecondsToUTC(%d).Seconds() = %d", sec, newsec)
+			t.Errorf("Unix(%d, 0).Unix() = %d", sec, newsec)
 		}
 		if !same(tm, golden) {
-			t.Errorf("SecondsToUTC(%d):  // %#v", sec, tm)
+			t.Errorf("Unix(%d, 0):  // %#v", sec, tm)
 			t.Errorf("  want=%+v", *golden)
 			t.Errorf("  have=%v", tm.Format(RFC3339+" MST"))
 		}
 	}
 }
 
-func TestNanosecondsToUTC(t *testing.T) {
+func TestUnixNanoUTC(t *testing.T) {
 	for _, test := range nanoutctests {
 		golden := &test.golden
 		nsec := test.seconds*1e9 + int64(golden.Nanosecond)
 		tm := Unix(0, nsec).UTC()
 		newnsec := tm.Unix()*1e9 + int64(tm.Nanosecond())
 		if newnsec != nsec {
-			t.Errorf("NanosecondsToUTC(%d).Nanoseconds() = %d", nsec, newnsec)
+			t.Errorf("Unix(0, %d).Nanoseconds() = %d", nsec, newnsec)
 		}
 		if !same(tm, golden) {
-			t.Errorf("NanosecondsToUTC(%d):", nsec)
+			t.Errorf("Unix(0, %d):", nsec)
 			t.Errorf("  want=%+v", *golden)
 			t.Errorf("  have=%+v", tm.Format(RFC3339+" MST"))
 		}
 	}
 }
 
-func TestSecondsToLocalTime(t *testing.T) {
+func TestUnix(t *testing.T) {
 	for _, test := range localtests {
 		sec := test.seconds
 		golden := &test.golden
 		tm := Unix(sec, 0)
 		newsec := tm.Unix()
 		if newsec != sec {
-			t.Errorf("SecondsToLocalTime(%d).Seconds() = %d", sec, newsec)
+			t.Errorf("Unix(%d, 0).Seconds() = %d", sec, newsec)
 		}
 		if !same(tm, golden) {
-			t.Errorf("SecondsToLocalTime(%d):", sec)
+			t.Errorf("Unix(%d, 0):", sec)
 			t.Errorf("  want=%+v", *golden)
 			t.Errorf("  have=%+v", tm.Format(RFC3339+" MST"))
 		}
 	}
 }
 
-func TestNanosecondsToLocalTime(t *testing.T) {
+func TestUnixNano(t *testing.T) {
 	for _, test := range nanolocaltests {
 		golden := &test.golden
 		nsec := test.seconds*1e9 + int64(golden.Nanosecond)
 		tm := Unix(0, nsec)
 		newnsec := tm.Unix()*1e9 + int64(tm.Nanosecond())
 		if newnsec != nsec {
-			t.Errorf("NanosecondsToLocalTime(%d).Seconds() = %d", nsec, newnsec)
+			t.Errorf("Unix(0, %d).Seconds() = %d", nsec, newnsec)
 		}
 		if !same(tm, golden) {
-			t.Errorf("NanosecondsToLocalTime(%d):", nsec)
+			t.Errorf("Unix(0, %d):", nsec)
 			t.Errorf("  want=%+v", *golden)
 			t.Errorf("  have=%+v", tm.Format(RFC3339+" MST"))
 		}
 	}
 }
 
-func TestSecondsToUTCAndBack(t *testing.T) {
+func TestUnixUTCAndBack(t *testing.T) {
 	f := func(sec int64) bool { return Unix(sec, 0).UTC().Unix() == sec }
 	f32 := func(sec int32) bool { return f(int64(sec)) }
 	cfg := &quick.Config{MaxCount: 10000}
@@ -185,7 +205,7 @@ func TestSecondsToUTCAndBack(t *testing.T) {
 	}
 }
 
-func TestNanosecondsToUTCAndBack(t *testing.T) {
+func TestUnixNanoUTCAndBack(t *testing.T) {
 	f := func(nsec int64) bool {
 		t := Unix(0, nsec).UTC()
 		ns := t.Unix()*1e9 + int64(t.Nanosecond())
@@ -647,6 +667,9 @@ var dateTests = []struct {
 	{2012, 1, -43, 7, 56, 35, 0, Local, 1321631795},                 // Jan -52 7:56:35 2012
 	{2012, int(January - 2), 18, 7, 56, 35, 0, Local, 1321631795},   // (Jan-2) 18 7:56:35 2012
 	{2010, int(December + 11), 18, 7, 56, 35, 0, Local, 1321631795}, // (Dec+11) 18 7:56:35 2010
+	{1970, 1, 15297, 7, 56, 35, 0, Local, 1321631795},               // large number of days
+
+	{1970, 1, -25508, 0, 0, 0, 0, Local, -2203948800}, // negative Unix time
 }
 
 func TestDate(t *testing.T) {
@@ -685,6 +708,13 @@ func TestAddDate(t *testing.T) {
 				time, t1)
 		}
 	}
+
+	t2 := Date(1899, 12, 31, 0, 0, 0, 0, UTC)
+	days := t2.Unix() / (24 * 60 * 60)
+	t3 := Unix(0, 0).AddDate(0, 0, int(days))
+	if !t2.Equal(t3) {
+		t.Errorf("Adddate(0, 0, %d) = %v, want %v", days, t3, t2)
+	}
 }
 
 var daysInTests = []struct {
@@ -886,6 +916,16 @@ func TestMarshalInvalidTimes(t *testing.T) {
 		case err == nil || err.Error() != want:
 			t.Errorf("(%v).MarshalText() error = %v, want %v", tt.time, err, want)
 		}
+
+		buf := make([]byte, 0, 64)
+		want = strings.ReplaceAll(tt.want, "MarshalJSON", "AppendText")
+		b, err = tt.time.AppendText(buf)
+		switch {
+		case b != nil:
+			t.Errorf("(%v).AppendText() = %q, want nil", tt.time, b)
+		case err == nil || err.Error() != want:
+			t.Errorf("(%v).AppendText() error = %v, want %v", tt.time, err, want)
+		}
 	}
 }
 
@@ -1360,7 +1400,7 @@ var defaultLocTests = []struct {
 	{"Add", func(t1, t2 Time) bool { return t1.Add(Hour).Equal(t2.Add(Hour)) }},
 	{"Sub", func(t1, t2 Time) bool { return t1.Sub(t2) == t2.Sub(t1) }},
 
-	//Original caus for this test case bug 15852
+	// Original cause for this test case bug 15852
 	{"AddDate", func(t1, t2 Time) bool { return t1.AddDate(1991, 9, 3) == t2.AddDate(1991, 9, 3) }},
 
 	{"UTC", func(t1, t2 Time) bool { return t1.UTC() == t2.UTC() }},
@@ -1379,6 +1419,13 @@ var defaultLocTests = []struct {
 	{"UnixMilli", func(t1, t2 Time) bool { return t1.UnixMilli() == t2.UnixMilli() }},
 	{"UnixMicro", func(t1, t2 Time) bool { return t1.UnixMicro() == t2.UnixMicro() }},
 
+	{"AppendBinary", func(t1, t2 Time) bool {
+		buf1 := make([]byte, 4, 32)
+		buf2 := make([]byte, 4, 32)
+		a1, b1 := t1.AppendBinary(buf1)
+		a2, b2 := t2.AppendBinary(buf2)
+		return bytes.Equal(a1[4:], a2[4:]) && b1 == b2
+	}},
 	{"MarshalBinary", func(t1, t2 Time) bool {
 		a1, b1 := t1.MarshalBinary()
 		a2, b2 := t2.MarshalBinary()
@@ -1394,6 +1441,14 @@ var defaultLocTests = []struct {
 		a2, b2 := t2.MarshalJSON()
 		return bytes.Equal(a1, a2) && b1 == b2
 	}},
+	{"AppendText", func(t1, t2 Time) bool {
+		maxCap := len(RFC3339Nano) + 4
+		buf1 := make([]byte, 4, maxCap)
+		buf2 := make([]byte, 4, maxCap)
+		a1, b1 := t1.AppendText(buf1)
+		a2, b2 := t2.AppendText(buf2)
+		return bytes.Equal(a1[4:], a2[4:]) && b1 == b2
+	}},
 	{"MarshalText", func(t1, t2 Time) bool {
 		a1, b1 := t1.MarshalText()
 		a2, b2 := t2.MarshalText()
@@ -1486,6 +1541,13 @@ func BenchmarkMarshalText(b *testing.B) {
 	}
 }
 
+func BenchmarkMarshalBinary(b *testing.B) {
+	t := Now()
+	for i := 0; i < b.N; i++ {
+		t.MarshalBinary()
+	}
+}
+
 func BenchmarkParse(b *testing.B) {
 	for i := 0; i < b.N; i++ {
 		Parse(ANSIC, "Mon Jan  2 15:04:05 2006")
diff --git a/src/time/zoneinfo.go b/src/time/zoneinfo.go
index 0fe13630..aee0e540 100644
--- a/src/time/zoneinfo.go
+++ b/src/time/zoneinfo.go
@@ -331,14 +331,11 @@ func tzset(s string, lastTxSec, sec int64) (name string, offset int, start, end
 		return "", 0, 0, 0, false, false
 	}
 
-	year, _, _, yday := absDate(uint64(sec+unixToInternal+internalToAbsolute), false)
-
-	ysec := int64(yday*secondsPerDay) + sec%secondsPerDay
-
-	// Compute start of year in seconds since Unix epoch.
-	d := daysSinceEpoch(year)
-	abs := int64(d * secondsPerDay)
-	abs += absoluteToInternal + internalToUnix
+	// Compute start of year in seconds since Unix epoch,
+	// and seconds since then to get to sec.
+	year, yday := absSeconds(sec + unixToInternal + internalToAbsolute).days().yearYday()
+	ysec := int64((yday-1)*secondsPerDay) + sec%secondsPerDay
+	ystart := sec - ysec
 
 	startSec := int64(tzruleTime(year, startRule, stdOffset))
 	endSec := int64(tzruleTime(year, endRule, dstOffset))
@@ -358,11 +355,11 @@ func tzset(s string, lastTxSec, sec int64) (name string, offset int, start, end
 	// just the start and end of the year. That suffices for
 	// the only caller that cares, which is Date.
 	if ysec < startSec {
-		return stdName, stdOffset, abs, startSec + abs, stdIsDST, true
+		return stdName, stdOffset, ystart, startSec + ystart, stdIsDST, true
 	} else if ysec >= endSec {
-		return stdName, stdOffset, endSec + abs, abs + 365*secondsPerDay, stdIsDST, true
+		return stdName, stdOffset, endSec + ystart, ystart + 365*secondsPerDay, stdIsDST, true
 	} else {
-		return dstName, dstOffset, startSec + abs, endSec + abs, dstIsDST, true
+		return dstName, dstOffset, startSec + ystart, endSec + ystart, dstIsDST, true
 	}
 }
 
@@ -596,7 +593,7 @@ func tzruleTime(year int, r rule, off int) int {
 			}
 			d += 7
 		}
-		d += int(daysBefore[r.mon-1])
+		d += int(daysBefore(Month(r.mon)))
 		if isLeap(year) && r.mon > 2 {
 			d++
 		}
diff --git a/src/time/zoneinfo_abbrs_windows.go b/src/time/zoneinfo_abbrs_windows.go
index 27831743..814d9443 100644
--- a/src/time/zoneinfo_abbrs_windows.go
+++ b/src/time/zoneinfo_abbrs_windows.go
@@ -36,7 +36,7 @@ var abbrs = map[string]abbr{
 	"Central Standard Time":           {"CST", "CDT"},     // America/Chicago
 	"Central Brazilian Standard Time": {"-04", "-04"},     // America/Cuiaba
 	"Mountain Standard Time":          {"MST", "MDT"},     // America/Denver
-	"Greenland Standard Time":         {"-03", "-02"},     // America/Godthab
+	"Greenland Standard Time":         {"-02", "-01"},     // America/Godthab
 	"Turks And Caicos Standard Time":  {"EST", "EDT"},     // America/Grand_Turk
 	"Central America Standard Time":   {"CST", "CST"},     // America/Guatemala
 	"Atlantic Standard Time":          {"AST", "ADT"},     // America/Halifax
@@ -58,13 +58,13 @@ var abbrs = map[string]abbr{
 	"Newfoundland Standard Time":      {"NST", "NDT"},     // America/St_Johns
 	"Pacific Standard Time (Mexico)":  {"PST", "PDT"},     // America/Tijuana
 	"Yukon Standard Time":             {"MST", "MST"},     // America/Whitehorse
-	"Central Asia Standard Time":      {"+06", "+06"},     // Asia/Almaty
 	"Jordan Standard Time":            {"+03", "+03"},     // Asia/Amman
 	"Arabic Standard Time":            {"+03", "+03"},     // Asia/Baghdad
 	"Azerbaijan Standard Time":        {"+04", "+04"},     // Asia/Baku
 	"SE Asia Standard Time":           {"+07", "+07"},     // Asia/Bangkok
 	"Altai Standard Time":             {"+07", "+07"},     // Asia/Barnaul
 	"Middle East Standard Time":       {"EET", "EEST"},    // Asia/Beirut
+	"Central Asia Standard Time":      {"+06", "+06"},     // Asia/Bishkek
 	"India Standard Time":             {"IST", "IST"},     // Asia/Calcutta
 	"Transbaikal Standard Time":       {"+09", "+09"},     // Asia/Chita
 	"Sri Lanka Standard Time":         {"+0530", "+0530"}, // Asia/Colombo
diff --git a/src/time/zoneinfo_plan9.go b/src/time/zoneinfo_plan9.go
index d13b623a..036f669d 100644
--- a/src/time/zoneinfo_plan9.go
+++ b/src/time/zoneinfo_plan9.go
@@ -96,7 +96,7 @@ func loadZoneDataPlan9(s string) (l *Location, err error) {
 
 	// Fill in the cache with information about right now,
 	// since that will be the most common lookup.
-	sec, _, _ := now()
+	sec, _, _ := runtimeNow()
 	for i := range tx {
 		if tx[i].when <= sec && (i+1 == len(tx) || sec < tx[i+1].when) {
 			l.cacheStart = tx[i].when
diff --git a/src/time/zoneinfo_read.go b/src/time/zoneinfo_read.go
index 5314b6ff..047e360d 100644
--- a/src/time/zoneinfo_read.go
+++ b/src/time/zoneinfo_read.go
@@ -320,7 +320,7 @@ func LoadLocationFromTZData(name string, data []byte) (*Location, error) {
 
 	// Fill in the cache with information about right now,
 	// since that will be the most common lookup.
-	sec, _, _ := now()
+	sec, _, _ := runtimeNow()
 	for i := range tx {
 		if tx[i].when <= sec && (i+1 == len(tx) || sec < tx[i+1].when) {
 			l.cacheStart = tx[i].when
diff --git a/src/time/zoneinfo_windows.go b/src/time/zoneinfo_windows.go
index c9f38ea3..55b21fa3 100644
--- a/src/time/zoneinfo_windows.go
+++ b/src/time/zoneinfo_windows.go
@@ -20,7 +20,7 @@ var platformZoneSources []string // none: Windows uses system calls instead
 // time apply to all previous and future years as well.
 
 // matchZoneKey checks if stdname and dstname match the corresponding key
-// values "MUI_Std" and MUI_Dlt" or "Std" and "Dlt" in the kname key stored
+// values "MUI_Std" and "MUI_Dlt" or "Std" and "Dlt" in the kname key stored
 // under the open registry key zones.
 func matchZoneKey(zones registry.Key, kname string, stdname, dstname string) (matched bool, err2 error) {
 	k, err := registry.OpenKey(zones, kname, registry.READ)
diff --git a/src/unicode/letter.go b/src/unicode/letter.go
index 9e2cead6..3959314c 100644
--- a/src/unicode/letter.go
+++ b/src/unicode/letter.go
@@ -206,34 +206,17 @@ func IsTitle(r rune) bool {
 	return isExcludingLatin(Title, r)
 }
 
-// to maps the rune using the specified case mapping.
-// It additionally reports whether caseRange contained a mapping for r.
-func to(_case int, r rune, caseRange []CaseRange) (mappedRune rune, foundMapping bool) {
-	if _case < 0 || MaxCase <= _case {
-		return ReplacementChar, false // as reasonable an error as any
-	}
+// lookupCaseRange returns the CaseRange mapping for rune r or nil if no
+// mapping exists for r.
+func lookupCaseRange(r rune, caseRange []CaseRange) *CaseRange {
 	// binary search over ranges
 	lo := 0
 	hi := len(caseRange)
 	for lo < hi {
 		m := int(uint(lo+hi) >> 1)
-		cr := caseRange[m]
+		cr := &caseRange[m]
 		if rune(cr.Lo) <= r && r <= rune(cr.Hi) {
-			delta := cr.Delta[_case]
-			if delta > MaxRune {
-				// In an Upper-Lower sequence, which always starts with
-				// an UpperCase letter, the real deltas always look like:
-				//	{0, 1, 0}    UpperCase (Lower is next)
-				//	{-1, 0, -1}  LowerCase (Upper, Title are previous)
-				// The characters at even offsets from the beginning of the
-				// sequence are upper case; the ones at odd offsets are lower.
-				// The correct mapping can be done by clearing or setting the low
-				// bit in the sequence offset.
-				// The constants UpperCase and TitleCase are even while LowerCase
-				// is odd so we take the low bit from _case.
-				return rune(cr.Lo) + ((r-rune(cr.Lo))&^1 | rune(_case&1)), true
-			}
-			return r + delta, true
+			return cr
 		}
 		if r < rune(cr.Lo) {
 			hi = m
@@ -241,6 +224,37 @@ func to(_case int, r rune, caseRange []CaseRange) (mappedRune rune, foundMapping
 			lo = m + 1
 		}
 	}
+	return nil
+}
+
+// convertCase converts r to _case using CaseRange cr.
+func convertCase(_case int, r rune, cr *CaseRange) rune {
+	delta := cr.Delta[_case]
+	if delta > MaxRune {
+		// In an Upper-Lower sequence, which always starts with
+		// an UpperCase letter, the real deltas always look like:
+		//	{0, 1, 0}    UpperCase (Lower is next)
+		//	{-1, 0, -1}  LowerCase (Upper, Title are previous)
+		// The characters at even offsets from the beginning of the
+		// sequence are upper case; the ones at odd offsets are lower.
+		// The correct mapping can be done by clearing or setting the low
+		// bit in the sequence offset.
+		// The constants UpperCase and TitleCase are even while LowerCase
+		// is odd so we take the low bit from _case.
+		return rune(cr.Lo) + ((r-rune(cr.Lo))&^1 | rune(_case&1))
+	}
+	return r + delta
+}
+
+// to maps the rune using the specified case mapping.
+// It additionally reports whether caseRange contained a mapping for r.
+func to(_case int, r rune, caseRange []CaseRange) (mappedRune rune, foundMapping bool) {
+	if _case < 0 || MaxCase <= _case {
+		return ReplacementChar, false // as reasonable an error as any
+	}
+	if cr := lookupCaseRange(r, caseRange); cr != nil {
+		return convertCase(_case, r, cr), true
+	}
 	return r, false
 }
 
@@ -364,8 +378,11 @@ func SimpleFold(r rune) rune {
 	// No folding specified. This is a one- or two-element
 	// equivalence class containing rune and ToLower(rune)
 	// and ToUpper(rune) if they are different from rune.
-	if l := ToLower(r); l != r {
-		return l
+	if cr := lookupCaseRange(r, CaseRanges); cr != nil {
+		if l := convertCase(LowerCase, r, cr); l != r {
+			return l
+		}
+		return convertCase(UpperCase, r, cr)
 	}
-	return ToUpper(r)
+	return r
 }
diff --git a/src/unicode/letter_test.go b/src/unicode/letter_test.go
index 123f9a64..75c8aeee 100644
--- a/src/unicode/letter_test.go
+++ b/src/unicode/letter_test.go
@@ -642,3 +642,29 @@ func TestNegativeRune(t *testing.T) {
 		}
 	}
 }
+
+func BenchmarkToUpper(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		_ = ToUpper('δ')
+	}
+}
+
+func BenchmarkToLower(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		_ = ToLower('Δ')
+	}
+}
+
+func BenchmarkSimpleFold(b *testing.B) {
+	bench := func(name string, r rune) {
+		b.Run(name, func(b *testing.B) {
+			for i := 0; i < b.N; i++ {
+				_ = SimpleFold(r)
+			}
+		})
+	}
+	bench("Upper", 'Δ')
+	bench("Lower", 'δ')
+	bench("Fold", '\u212A')
+	bench("NoFold", '習')
+}
diff --git a/src/unicode/utf16/utf16_test.go b/src/unicode/utf16/utf16_test.go
index 74a4a674..3d434275 100644
--- a/src/unicode/utf16/utf16_test.go
+++ b/src/unicode/utf16/utf16_test.go
@@ -6,7 +6,7 @@ package utf16_test
 
 import (
 	"internal/testenv"
-	"reflect"
+	"slices"
 	"testing"
 	"unicode"
 	. "unicode/utf16"
@@ -58,7 +58,7 @@ var encodeTests = []encodeTest{
 func TestEncode(t *testing.T) {
 	for _, tt := range encodeTests {
 		out := Encode(tt.in)
-		if !reflect.DeepEqual(out, tt.out) {
+		if !slices.Equal(out, tt.out) {
 			t.Errorf("Encode(%x) = %x; want %x", tt.in, out, tt.out)
 		}
 	}
@@ -70,7 +70,7 @@ func TestAppendRune(t *testing.T) {
 		for _, u := range tt.in {
 			out = AppendRune(out, u)
 		}
-		if !reflect.DeepEqual(out, tt.out) {
+		if !slices.Equal(out, tt.out) {
 			t.Errorf("AppendRune(%x) = %x; want %x", tt.in, out, tt.out)
 		}
 	}
@@ -143,7 +143,7 @@ func TestAllocationsDecode(t *testing.T) {
 func TestDecode(t *testing.T) {
 	for _, tt := range decodeTests {
 		out := Decode(tt.in)
-		if !reflect.DeepEqual(out, tt.out) {
+		if !slices.Equal(out, tt.out) {
 			t.Errorf("Decode(%x) = %x; want %x", tt.in, out, tt.out)
 		}
 	}
diff --git a/src/unicode/utf8/utf8.go b/src/unicode/utf8/utf8.go
index c7389d4d..180c008e 100644
--- a/src/unicode/utf8/utf8.go
+++ b/src/unicode/utf8/utf8.go
@@ -61,6 +61,12 @@ const (
 	s7 = 0x44 // accept 4, size 4
 )
 
+const (
+	runeErrorByte0 = t3 | (RuneError >> 12)
+	runeErrorByte1 = tx | (RuneError>>6)&maskx
+	runeErrorByte2 = tx | RuneError&maskx
+)
+
 // first is information about the first byte in a UTF-8 sequence.
 var first = [256]uint8{
 	//   1   2   3   4   5   6   7   8   9   A   B   C   D   E   F
@@ -340,32 +346,41 @@ func RuneLen(r rune) int {
 // If the rune is out of range, it writes the encoding of [RuneError].
 // It returns the number of bytes written.
 func EncodeRune(p []byte, r rune) int {
-	// Negative values are erroneous. Making it unsigned addresses the problem.
-	switch i := uint32(r); {
-	case i <= rune1Max:
+	// This function is inlineable for fast handling of ASCII.
+	if uint32(r) <= rune1Max {
 		p[0] = byte(r)
 		return 1
+	}
+	return encodeRuneNonASCII(p, r)
+}
+
+func encodeRuneNonASCII(p []byte, r rune) int {
+	// Negative values are erroneous. Making it unsigned addresses the problem.
+	switch i := uint32(r); {
 	case i <= rune2Max:
 		_ = p[1] // eliminate bounds checks
 		p[0] = t2 | byte(r>>6)
 		p[1] = tx | byte(r)&maskx
 		return 2
-	case i > MaxRune, surrogateMin <= i && i <= surrogateMax:
-		r = RuneError
-		fallthrough
-	case i <= rune3Max:
+	case i < surrogateMin, surrogateMax < i && i <= rune3Max:
 		_ = p[2] // eliminate bounds checks
 		p[0] = t3 | byte(r>>12)
 		p[1] = tx | byte(r>>6)&maskx
 		p[2] = tx | byte(r)&maskx
 		return 3
-	default:
+	case i > rune3Max && i <= MaxRune:
 		_ = p[3] // eliminate bounds checks
 		p[0] = t4 | byte(r>>18)
 		p[1] = tx | byte(r>>12)&maskx
 		p[2] = tx | byte(r>>6)&maskx
 		p[3] = tx | byte(r)&maskx
 		return 4
+	default:
+		_ = p[2] // eliminate bounds checks
+		p[0] = runeErrorByte0
+		p[1] = runeErrorByte1
+		p[2] = runeErrorByte2
+		return 3
 	}
 }
 
@@ -385,13 +400,12 @@ func appendRuneNonASCII(p []byte, r rune) []byte {
 	switch i := uint32(r); {
 	case i <= rune2Max:
 		return append(p, t2|byte(r>>6), tx|byte(r)&maskx)
-	case i > MaxRune, surrogateMin <= i && i <= surrogateMax:
-		r = RuneError
-		fallthrough
-	case i <= rune3Max:
+	case i < surrogateMin, surrogateMax < i && i <= rune3Max:
 		return append(p, t3|byte(r>>12), tx|byte(r>>6)&maskx, tx|byte(r)&maskx)
-	default:
+	case i > rune3Max && i <= MaxRune:
 		return append(p, t4|byte(r>>18), tx|byte(r>>12)&maskx, tx|byte(r>>6)&maskx, tx|byte(r)&maskx)
+	default:
+		return append(p, runeErrorByte0, runeErrorByte1, runeErrorByte2)
 	}
 }
 
@@ -400,70 +414,19 @@ func appendRuneNonASCII(p []byte, r rune) []byte {
 func RuneCount(p []byte) int {
 	np := len(p)
 	var n int
-	for i := 0; i < np; {
-		n++
-		c := p[i]
-		if c < RuneSelf {
-			// ASCII fast path
-			i++
-			continue
+	for ; n < np; n++ {
+		if c := p[n]; c >= RuneSelf {
+			// non-ASCII slow path
+			return n + RuneCountInString(string(p[n:]))
 		}
-		x := first[c]
-		if x == xx {
-			i++ // invalid.
-			continue
-		}
-		size := int(x & 7)
-		if i+size > np {
-			i++ // Short or invalid.
-			continue
-		}
-		accept := acceptRanges[x>>4]
-		if c := p[i+1]; c < accept.lo || accept.hi < c {
-			size = 1
-		} else if size == 2 {
-		} else if c := p[i+2]; c < locb || hicb < c {
-			size = 1
-		} else if size == 3 {
-		} else if c := p[i+3]; c < locb || hicb < c {
-			size = 1
-		}
-		i += size
 	}
 	return n
 }
 
 // RuneCountInString is like [RuneCount] but its input is a string.
 func RuneCountInString(s string) (n int) {
-	ns := len(s)
-	for i := 0; i < ns; n++ {
-		c := s[i]
-		if c < RuneSelf {
-			// ASCII fast path
-			i++
-			continue
-		}
-		x := first[c]
-		if x == xx {
-			i++ // invalid.
-			continue
-		}
-		size := int(x & 7)
-		if i+size > ns {
-			i++ // Short or invalid.
-			continue
-		}
-		accept := acceptRanges[x>>4]
-		if c := s[i+1]; c < accept.lo || accept.hi < c {
-			size = 1
-		} else if size == 2 {
-		} else if c := s[i+2]; c < locb || hicb < c {
-			size = 1
-		} else if size == 3 {
-		} else if c := s[i+3]; c < locb || hicb < c {
-			size = 1
-		}
-		i += size
+	for range s {
+		n++
 	}
 	return n
 }
diff --git a/src/unicode/utf8/utf8_test.go b/src/unicode/utf8/utf8_test.go
index 19a04dc9..69362d2c 100644
--- a/src/unicode/utf8/utf8_test.go
+++ b/src/unicode/utf8/utf8_test.go
@@ -170,7 +170,7 @@ func TestDecodeRune(t *testing.T) {
 		}
 		r, size = DecodeRune(b[0 : len(b)-1])
 		if r != RuneError || size != wantsize {
-			t.Errorf("DecodeRune(%q) = %#04x, %d want %#04x, %d", b[0:len(b)-1], r, size, RuneError, wantsize)
+			t.Errorf("DecodeRune(%q) = %#04x, %d want %#04x, %d", b[:len(b)-1], r, size, RuneError, wantsize)
 		}
 		s = m.str[0 : len(m.str)-1]
 		r, size = DecodeRuneInString(s)
@@ -438,6 +438,15 @@ func TestRuneCount(t *testing.T) {
 	}
 }
 
+func TestRuneCountNonASCIIAllocation(t *testing.T) {
+	if n := testing.AllocsPerRun(10, func() {
+		s := []byte("日本語日本語日本語日")
+		_ = RuneCount(s)
+	}); n > 0 {
+		t.Errorf("unexpected RuneCount allocation, got %v, want 0", n)
+	}
+}
+
 type RuneLenTest struct {
 	r    rune
 	size int
@@ -641,28 +650,98 @@ func init() {
 func BenchmarkEncodeASCIIRune(b *testing.B) {
 	buf := make([]byte, UTFMax)
 	for i := 0; i < b.N; i++ {
-		EncodeRune(buf, 'a')
+		EncodeRune(buf, 'a') // 1 byte
+	}
+}
+
+func BenchmarkEncodeSpanishRune(b *testing.B) {
+	buf := make([]byte, UTFMax)
+	for i := 0; i < b.N; i++ {
+		EncodeRune(buf, 'Ñ') // 2 bytes
 	}
 }
 
 func BenchmarkEncodeJapaneseRune(b *testing.B) {
 	buf := make([]byte, UTFMax)
 	for i := 0; i < b.N; i++ {
-		EncodeRune(buf, '本')
+		EncodeRune(buf, '本') // 3 bytes
+	}
+}
+
+func BenchmarkEncodeMaxRune(b *testing.B) {
+	buf := make([]byte, UTFMax)
+	for i := 0; i < b.N; i++ {
+		EncodeRune(buf, MaxRune) // 4 bytes
+	}
+}
+
+func BenchmarkEncodeInvalidRuneMaxPlusOne(b *testing.B) {
+	buf := make([]byte, UTFMax)
+	for i := 0; i < b.N; i++ {
+		EncodeRune(buf, MaxRune+1) // 3 bytes: RuneError
+	}
+}
+
+func BenchmarkEncodeInvalidRuneSurrogate(b *testing.B) {
+	buf := make([]byte, UTFMax)
+	for i := 0; i < b.N; i++ {
+		EncodeRune(buf, 0xD800) // 3 bytes: RuneError
+	}
+}
+
+func BenchmarkEncodeInvalidRuneNegative(b *testing.B) {
+	buf := make([]byte, UTFMax)
+	for i := 0; i < b.N; i++ {
+		EncodeRune(buf, -1) // 3 bytes: RuneError
 	}
 }
 
 func BenchmarkAppendASCIIRune(b *testing.B) {
 	buf := make([]byte, UTFMax)
 	for i := 0; i < b.N; i++ {
-		AppendRune(buf[:0], 'a')
+		AppendRune(buf[:0], 'a') // 1 byte
+	}
+}
+
+func BenchmarkAppendSpanishRune(b *testing.B) {
+	buf := make([]byte, UTFMax)
+	for i := 0; i < b.N; i++ {
+		AppendRune(buf[:0], 'Ñ') // 2 bytes
 	}
 }
 
 func BenchmarkAppendJapaneseRune(b *testing.B) {
 	buf := make([]byte, UTFMax)
 	for i := 0; i < b.N; i++ {
-		AppendRune(buf[:0], '本')
+		AppendRune(buf[:0], '本') // 3 bytes
+	}
+}
+
+func BenchmarkAppendMaxRune(b *testing.B) {
+	buf := make([]byte, UTFMax)
+	for i := 0; i < b.N; i++ {
+		AppendRune(buf[:0], MaxRune) // 4 bytes
+	}
+}
+
+func BenchmarkAppendInvalidRuneMaxPlusOne(b *testing.B) {
+	buf := make([]byte, UTFMax)
+	for i := 0; i < b.N; i++ {
+		AppendRune(buf[:0], MaxRune+1) // 3 bytes: RuneError
+	}
+}
+
+func BenchmarkAppendInvalidRuneSurrogate(b *testing.B) {
+	buf := make([]byte, UTFMax)
+	for i := 0; i < b.N; i++ {
+		AppendRune(buf[:0], 0xD800) // 3 bytes: RuneError
+	}
+}
+
+func BenchmarkAppendInvalidRuneNegative(b *testing.B) {
+	buf := make([]byte, UTFMax)
+	for i := 0; i < b.N; i++ {
+		AppendRune(buf[:0], -1) // 3 bytes: RuneError
 	}
 }
 
diff --git a/src/unique/handle.go b/src/unique/handle.go
index abc620f6..520ab70f 100644
--- a/src/unique/handle.go
+++ b/src/unique/handle.go
@@ -6,13 +6,15 @@ package unique
 
 import (
 	"internal/abi"
-	"internal/concurrent"
-	"internal/weak"
+	isync "internal/sync"
 	"runtime"
 	"sync"
-	_ "unsafe"
+	"unsafe"
+	"weak"
 )
 
+var zero uintptr
+
 // Handle is a globally unique identity for some value of type T.
 //
 // Two handles compare equal exactly if the two values used to create the handles
@@ -23,15 +25,20 @@ type Handle[T comparable] struct {
 }
 
 // Value returns a shallow copy of the T value that produced the Handle.
+// Value is safe for concurrent use by multiple goroutines.
 func (h Handle[T]) Value() T {
 	return *h.value
 }
 
 // Make returns a globally unique handle for a value of type T. Handles
 // are equal if and only if the values used to produce them are equal.
+// Make is safe for concurrent use by multiple goroutines.
 func Make[T comparable](value T) Handle[T] {
 	// Find the map for type T.
 	typ := abi.TypeFor[T]()
+	if typ.Size() == 0 {
+		return Handle[T]{(*T)(unsafe.Pointer(&zero))}
+	}
 	ma, ok := uniqueMaps.Load(typ)
 	if !ok {
 		// This is a good time to initialize cleanup, since we must go through
@@ -69,7 +76,7 @@ func Make[T comparable](value T) Handle[T] {
 		}
 		// Now that we're sure there's a value in the map, let's
 		// try to get the pointer we need out of it.
-		ptr = wp.Strong()
+		ptr = wp.Value()
 		if ptr != nil {
 			break
 		}
@@ -91,7 +98,7 @@ var (
 	// benefit of not cramming every different type into a single map, but that's certainly
 	// not enough to outweigh the cost of two map lookups. What is worth it though, is saving
 	// on those allocations.
-	uniqueMaps = concurrent.NewHashTrieMap[*abi.Type, any]() // any is always a *uniqueMap[T].
+	uniqueMaps isync.HashTrieMap[*abi.Type, any] // any is always a *uniqueMap[T].
 
 	// cleanupFuncs are functions that clean up dead weak pointers in type-specific
 	// maps in uniqueMaps. We express cleanup this way because there's no way to iterate
@@ -107,7 +114,7 @@ var (
 )
 
 type uniqueMap[T comparable] struct {
-	*concurrent.HashTrieMap[T, weak.Pointer[T]]
+	isync.HashTrieMap[T, weak.Pointer[T]]
 	cloneSeq
 }
 
@@ -116,10 +123,7 @@ func addUniqueMap[T comparable](typ *abi.Type) *uniqueMap[T] {
 	// race with someone else, but that's fine; it's one
 	// small, stray allocation. The number of allocations
 	// this can create is bounded by a small constant.
-	m := &uniqueMap[T]{
-		HashTrieMap: concurrent.NewHashTrieMap[T, weak.Pointer[T]](),
-		cloneSeq:    makeCloneSeq(typ),
-	}
+	m := &uniqueMap[T]{cloneSeq: makeCloneSeq(typ)}
 	a, loaded := uniqueMaps.LoadOrStore(typ, m)
 	if !loaded {
 		// Add a cleanup function for the new map.
@@ -128,7 +132,7 @@ func addUniqueMap[T comparable](typ *abi.Type) *uniqueMap[T] {
 			// Delete all the entries whose weak references are nil and clean up
 			// deleted entries.
 			m.All()(func(key T, wp weak.Pointer[T]) bool {
-				if wp.Strong() == nil {
+				if wp.Value() == nil {
 					m.CompareAndDelete(key, wp)
 				}
 				return true
diff --git a/src/unique/handle_test.go b/src/unique/handle_test.go
index dd4b01ef..4b708760 100644
--- a/src/unique/handle_test.go
+++ b/src/unique/handle_test.go
@@ -9,6 +9,7 @@ import (
 	"internal/abi"
 	"reflect"
 	"runtime"
+	"strconv"
 	"strings"
 	"testing"
 	"time"
@@ -31,20 +32,22 @@ type testStruct struct {
 	z float64
 	b string
 }
+type testZeroSize struct{}
 
 func TestHandle(t *testing.T) {
-	testHandle[testString](t, "foo")
-	testHandle[testString](t, "bar")
-	testHandle[testString](t, "")
-	testHandle[testIntArray](t, [4]int{7, 77, 777, 7777})
-	testHandle[testEface](t, nil)
-	testHandle[testStringArray](t, [3]string{"a", "b", "c"})
-	testHandle[testStringStruct](t, testStringStruct{"x"})
-	testHandle[testStringStructArrayStruct](t, testStringStructArrayStruct{
-		s: [2]testStringStruct{testStringStruct{"y"}, testStringStruct{"z"}},
+	testHandle(t, testString("foo"))
+	testHandle(t, testString("bar"))
+	testHandle(t, testString(""))
+	testHandle(t, testIntArray{7, 77, 777, 7777})
+	testHandle(t, testEface(nil))
+	testHandle(t, testStringArray{"a", "b", "c"})
+	testHandle(t, testStringStruct{"x"})
+	testHandle(t, testStringStructArrayStruct{
+		s: [2]testStringStruct{{"y"}, {"z"}},
 	})
-	testHandle[testStruct](t, testStruct{0.5, "184"})
-	testHandle[testEface](t, testEface("hello"))
+	testHandle(t, testStruct{0.5, "184"})
+	testHandle(t, testEface("hello"))
+	testHandle(t, testZeroSize(struct{}{}))
 }
 
 func testHandle[T comparable](t *testing.T, value T) {
@@ -65,15 +68,19 @@ func testHandle[T comparable](t *testing.T, value T) {
 			t.Error("v0 != v1")
 		}
 
-		drainMaps(t)
+		drainMaps[T](t)
 		checkMapsFor(t, value)
 	})
 }
 
 // drainMaps ensures that the internal maps are drained.
-func drainMaps(t *testing.T) {
+func drainMaps[T comparable](t *testing.T) {
 	t.Helper()
 
+	if unsafe.Sizeof(*(new(T))) == 0 {
+		return // zero-size types are not inserted.
+	}
+
 	wait := make(chan struct{}, 1)
 
 	// Set up a one-time notification for the next time the cleanup runs.
@@ -107,7 +114,7 @@ func checkMapsFor[T comparable](t *testing.T, value T) {
 	if !ok {
 		return
 	}
-	if wp.Strong() != nil {
+	if wp.Value() != nil {
 		t.Errorf("value %v still referenced a handle (or tiny block?) ", value)
 		return
 	}
@@ -132,3 +139,26 @@ func TestMakeClonesStrings(t *testing.T) {
 	}
 	runtime.KeepAlive(h)
 }
+
+func TestHandleUnsafeString(t *testing.T) {
+	var testData []string
+	for i := range 1024 {
+		testData = append(testData, strconv.Itoa(i))
+	}
+	var buf []byte
+	var handles []Handle[string]
+	for _, s := range testData {
+		if len(buf) < len(s) {
+			buf = make([]byte, len(s)*2)
+		}
+		copy(buf, s)
+		sbuf := unsafe.String(&buf[0], len(s))
+		handles = append(handles, Make(sbuf))
+	}
+	for i, s := range testData {
+		h := Make(s)
+		if handles[i].Value() != h.Value() {
+			t.Fatal("unsafe string improperly retained internally")
+		}
+	}
+}
diff --git a/src/vendor/golang.org/x/crypto/LICENSE b/src/vendor/golang.org/x/crypto/LICENSE
index 6a66aea5..2a7cf70d 100644
--- a/src/vendor/golang.org/x/crypto/LICENSE
+++ b/src/vendor/golang.org/x/crypto/LICENSE
@@ -1,4 +1,4 @@
-Copyright (c) 2009 The Go Authors. All rights reserved.
+Copyright 2009 The Go Authors.
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are
@@ -10,7 +10,7 @@ notice, this list of conditions and the following disclaimer.
 copyright notice, this list of conditions and the following disclaimer
 in the documentation and/or other materials provided with the
 distribution.
-   * Neither the name of Google Inc. nor the names of its
+   * Neither the name of Google LLC nor the names of its
 contributors may be used to endorse or promote products derived from
 this software without specific prior written permission.
 
diff --git a/src/vendor/golang.org/x/crypto/chacha20/chacha_noasm.go b/src/vendor/golang.org/x/crypto/chacha20/chacha_noasm.go
index db42e667..c709b728 100644
--- a/src/vendor/golang.org/x/crypto/chacha20/chacha_noasm.go
+++ b/src/vendor/golang.org/x/crypto/chacha20/chacha_noasm.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build (!arm64 && !s390x && !ppc64le) || !gc || purego
+//go:build (!arm64 && !s390x && !ppc64 && !ppc64le) || !gc || purego
 
 package chacha20
 
diff --git a/src/vendor/golang.org/x/crypto/chacha20/chacha_ppc64le.go b/src/vendor/golang.org/x/crypto/chacha20/chacha_ppc64x.go
similarity index 89%
rename from src/vendor/golang.org/x/crypto/chacha20/chacha_ppc64le.go
rename to src/vendor/golang.org/x/crypto/chacha20/chacha_ppc64x.go
index 3a4287f9..bd183d9b 100644
--- a/src/vendor/golang.org/x/crypto/chacha20/chacha_ppc64le.go
+++ b/src/vendor/golang.org/x/crypto/chacha20/chacha_ppc64x.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build gc && !purego
+//go:build gc && !purego && (ppc64 || ppc64le)
 
 package chacha20
 
diff --git a/src/vendor/golang.org/x/crypto/chacha20/chacha_ppc64le.s b/src/vendor/golang.org/x/crypto/chacha20/chacha_ppc64x.s
similarity index 76%
rename from src/vendor/golang.org/x/crypto/chacha20/chacha_ppc64le.s
rename to src/vendor/golang.org/x/crypto/chacha20/chacha_ppc64x.s
index c672ccf6..a660b411 100644
--- a/src/vendor/golang.org/x/crypto/chacha20/chacha_ppc64le.s
+++ b/src/vendor/golang.org/x/crypto/chacha20/chacha_ppc64x.s
@@ -19,7 +19,7 @@
 // The differences in this and the original implementation are
 // due to the calling conventions and initialization of constants.
 
-//go:build gc && !purego
+//go:build gc && !purego && (ppc64 || ppc64le)
 
 #include "textflag.h"
 
@@ -36,32 +36,68 @@
 // for VPERMXOR
 #define MASK  R18
 
-DATA consts<>+0x00(SB)/8, $0x3320646e61707865
-DATA consts<>+0x08(SB)/8, $0x6b20657479622d32
-DATA consts<>+0x10(SB)/8, $0x0000000000000001
-DATA consts<>+0x18(SB)/8, $0x0000000000000000
-DATA consts<>+0x20(SB)/8, $0x0000000000000004
-DATA consts<>+0x28(SB)/8, $0x0000000000000000
-DATA consts<>+0x30(SB)/8, $0x0a0b08090e0f0c0d
-DATA consts<>+0x38(SB)/8, $0x0203000106070405
-DATA consts<>+0x40(SB)/8, $0x090a0b080d0e0f0c
-DATA consts<>+0x48(SB)/8, $0x0102030005060704
-DATA consts<>+0x50(SB)/8, $0x6170786561707865
-DATA consts<>+0x58(SB)/8, $0x6170786561707865
-DATA consts<>+0x60(SB)/8, $0x3320646e3320646e
-DATA consts<>+0x68(SB)/8, $0x3320646e3320646e
-DATA consts<>+0x70(SB)/8, $0x79622d3279622d32
-DATA consts<>+0x78(SB)/8, $0x79622d3279622d32
-DATA consts<>+0x80(SB)/8, $0x6b2065746b206574
-DATA consts<>+0x88(SB)/8, $0x6b2065746b206574
-DATA consts<>+0x90(SB)/8, $0x0000000100000000
-DATA consts<>+0x98(SB)/8, $0x0000000300000002
-DATA consts<>+0xa0(SB)/8, $0x5566774411223300
-DATA consts<>+0xa8(SB)/8, $0xddeeffcc99aabb88
-DATA consts<>+0xb0(SB)/8, $0x6677445522330011
-DATA consts<>+0xb8(SB)/8, $0xeeffccddaabb8899
+DATA consts<>+0x00(SB)/4, $0x61707865
+DATA consts<>+0x04(SB)/4, $0x3320646e
+DATA consts<>+0x08(SB)/4, $0x79622d32
+DATA consts<>+0x0c(SB)/4, $0x6b206574
+DATA consts<>+0x10(SB)/4, $0x00000001
+DATA consts<>+0x14(SB)/4, $0x00000000
+DATA consts<>+0x18(SB)/4, $0x00000000
+DATA consts<>+0x1c(SB)/4, $0x00000000
+DATA consts<>+0x20(SB)/4, $0x00000004
+DATA consts<>+0x24(SB)/4, $0x00000000
+DATA consts<>+0x28(SB)/4, $0x00000000
+DATA consts<>+0x2c(SB)/4, $0x00000000
+DATA consts<>+0x30(SB)/4, $0x0e0f0c0d
+DATA consts<>+0x34(SB)/4, $0x0a0b0809
+DATA consts<>+0x38(SB)/4, $0x06070405
+DATA consts<>+0x3c(SB)/4, $0x02030001
+DATA consts<>+0x40(SB)/4, $0x0d0e0f0c
+DATA consts<>+0x44(SB)/4, $0x090a0b08
+DATA consts<>+0x48(SB)/4, $0x05060704
+DATA consts<>+0x4c(SB)/4, $0x01020300
+DATA consts<>+0x50(SB)/4, $0x61707865
+DATA consts<>+0x54(SB)/4, $0x61707865
+DATA consts<>+0x58(SB)/4, $0x61707865
+DATA consts<>+0x5c(SB)/4, $0x61707865
+DATA consts<>+0x60(SB)/4, $0x3320646e
+DATA consts<>+0x64(SB)/4, $0x3320646e
+DATA consts<>+0x68(SB)/4, $0x3320646e
+DATA consts<>+0x6c(SB)/4, $0x3320646e
+DATA consts<>+0x70(SB)/4, $0x79622d32
+DATA consts<>+0x74(SB)/4, $0x79622d32
+DATA consts<>+0x78(SB)/4, $0x79622d32
+DATA consts<>+0x7c(SB)/4, $0x79622d32
+DATA consts<>+0x80(SB)/4, $0x6b206574
+DATA consts<>+0x84(SB)/4, $0x6b206574
+DATA consts<>+0x88(SB)/4, $0x6b206574
+DATA consts<>+0x8c(SB)/4, $0x6b206574
+DATA consts<>+0x90(SB)/4, $0x00000000
+DATA consts<>+0x94(SB)/4, $0x00000001
+DATA consts<>+0x98(SB)/4, $0x00000002
+DATA consts<>+0x9c(SB)/4, $0x00000003
+DATA consts<>+0xa0(SB)/4, $0x11223300
+DATA consts<>+0xa4(SB)/4, $0x55667744
+DATA consts<>+0xa8(SB)/4, $0x99aabb88
+DATA consts<>+0xac(SB)/4, $0xddeeffcc
+DATA consts<>+0xb0(SB)/4, $0x22330011
+DATA consts<>+0xb4(SB)/4, $0x66774455
+DATA consts<>+0xb8(SB)/4, $0xaabb8899
+DATA consts<>+0xbc(SB)/4, $0xeeffccdd
 GLOBL consts<>(SB), RODATA, $0xc0
 
+#ifdef GOARCH_ppc64
+#define BE_XXBRW_INIT() \
+		LVSL (R0)(R0), V24 \
+		VSPLTISB $3, V25   \
+		VXOR V24, V25, V24 \
+
+#define BE_XXBRW(vr) VPERM vr, vr, V24, vr
+#else
+#define BE_XXBRW_INIT()
+#define BE_XXBRW(vr)
+#endif
+
 //func chaCha20_ctr32_vsx(out, inp *byte, len int, key *[8]uint32, counter *uint32)
 TEXT ·chaCha20_ctr32_vsx(SB),NOSPLIT,$64-40
 	MOVD out+0(FP), OUT
@@ -94,6 +130,8 @@ TEXT ·chaCha20_ctr32_vsx(SB),NOSPLIT,$64-40
 	// Clear V27
 	VXOR V27, V27, V27
 
+	BE_XXBRW_INIT()
+
 	// V28
 	LXVW4X (CONSTBASE)(R11), VS60
 
@@ -299,6 +337,11 @@ loop_vsx:
 	VADDUWM V8, V18, V8
 	VADDUWM V12, V19, V12
 
+	BE_XXBRW(V0)
+	BE_XXBRW(V4)
+	BE_XXBRW(V8)
+	BE_XXBRW(V12)
+
 	CMPU LEN, $64
 	BLT tail_vsx
 
@@ -327,6 +370,11 @@ loop_vsx:
 	VADDUWM V9, V18, V8
 	VADDUWM V13, V19, V12
 
+	BE_XXBRW(V0)
+	BE_XXBRW(V4)
+	BE_XXBRW(V8)
+	BE_XXBRW(V12)
+
 	CMPU  LEN, $64
 	BLT   tail_vsx
 
@@ -334,8 +382,8 @@ loop_vsx:
 	LXVW4X (INP)(R8), VS60
 	LXVW4X (INP)(R9), VS61
 	LXVW4X (INP)(R10), VS62
-	VXOR   V27, V0, V27
 
+	VXOR V27, V0, V27
 	VXOR V28, V4, V28
 	VXOR V29, V8, V29
 	VXOR V30, V12, V30
@@ -354,6 +402,11 @@ loop_vsx:
 	VADDUWM V10, V18, V8
 	VADDUWM V14, V19, V12
 
+	BE_XXBRW(V0)
+	BE_XXBRW(V4)
+	BE_XXBRW(V8)
+	BE_XXBRW(V12)
+
 	CMPU LEN, $64
 	BLT  tail_vsx
 
@@ -381,6 +434,11 @@ loop_vsx:
 	VADDUWM V11, V18, V8
 	VADDUWM V15, V19, V12
 
+	BE_XXBRW(V0)
+	BE_XXBRW(V4)
+	BE_XXBRW(V8)
+	BE_XXBRW(V12)
+
 	CMPU  LEN, $64
 	BLT   tail_vsx
 
@@ -408,9 +466,9 @@ loop_vsx:
 
 done_vsx:
 	// Increment counter by number of 64 byte blocks
-	MOVD (CNT), R14
+	MOVWZ (CNT), R14
 	ADD  BLOCKS, R14
-	MOVD R14, (CNT)
+	MOVWZ R14, (CNT)
 	RET
 
 tail_vsx:
diff --git a/src/vendor/golang.org/x/crypto/chacha20poly1305/chacha20poly1305.go b/src/vendor/golang.org/x/crypto/chacha20poly1305/chacha20poly1305.go
index 93da7322..8cf5d811 100644
--- a/src/vendor/golang.org/x/crypto/chacha20poly1305/chacha20poly1305.go
+++ b/src/vendor/golang.org/x/crypto/chacha20poly1305/chacha20poly1305.go
@@ -5,7 +5,7 @@
 // Package chacha20poly1305 implements the ChaCha20-Poly1305 AEAD and its
 // extended nonce variant XChaCha20-Poly1305, as specified in RFC 8439 and
 // draft-irtf-cfrg-xchacha-01.
-package chacha20poly1305 // import "golang.org/x/crypto/chacha20poly1305"
+package chacha20poly1305
 
 import (
 	"crypto/cipher"
diff --git a/src/vendor/golang.org/x/crypto/chacha20poly1305/chacha20poly1305_amd64.s b/src/vendor/golang.org/x/crypto/chacha20poly1305/chacha20poly1305_amd64.s
index 731d2ac6..fd5ee845 100644
--- a/src/vendor/golang.org/x/crypto/chacha20poly1305/chacha20poly1305_amd64.s
+++ b/src/vendor/golang.org/x/crypto/chacha20poly1305/chacha20poly1305_amd64.s
@@ -1,2715 +1,9762 @@
-// Copyright 2016 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// This file was originally from https://golang.org/cl/24717 by Vlad Krasnov of CloudFlare.
+// Code generated by command: go run chacha20poly1305_amd64_asm.go -out ../chacha20poly1305_amd64.s -pkg chacha20poly1305. DO NOT EDIT.
 
 //go:build gc && !purego
 
 #include "textflag.h"
-// General register allocation
-#define oup DI
-#define inp SI
-#define inl BX
-#define adp CX // free to reuse, after we hash the additional data
-#define keyp R8 // free to reuse, when we copy the key to stack
-#define itr2 R9 // general iterator
-#define itr1 CX // general iterator
-#define acc0 R10
-#define acc1 R11
-#define acc2 R12
-#define t0 R13
-#define t1 R14
-#define t2 R15
-#define t3 R8
-// Register and stack allocation for the SSE code
-#define rStore (0*16)(BP)
-#define sStore (1*16)(BP)
-#define state1Store (2*16)(BP)
-#define state2Store (3*16)(BP)
-#define tmpStore (4*16)(BP)
-#define ctr0Store (5*16)(BP)
-#define ctr1Store (6*16)(BP)
-#define ctr2Store (7*16)(BP)
-#define ctr3Store (8*16)(BP)
-#define A0 X0
-#define A1 X1
-#define A2 X2
-#define B0 X3
-#define B1 X4
-#define B2 X5
-#define C0 X6
-#define C1 X7
-#define C2 X8
-#define D0 X9
-#define D1 X10
-#define D2 X11
-#define T0 X12
-#define T1 X13
-#define T2 X14
-#define T3 X15
-#define A3 T0
-#define B3 T1
-#define C3 T2
-#define D3 T3
-// Register and stack allocation for the AVX2 code
-#define rsStoreAVX2 (0*32)(BP)
-#define state1StoreAVX2 (1*32)(BP)
-#define state2StoreAVX2 (2*32)(BP)
-#define ctr0StoreAVX2 (3*32)(BP)
-#define ctr1StoreAVX2 (4*32)(BP)
-#define ctr2StoreAVX2 (5*32)(BP)
-#define ctr3StoreAVX2 (6*32)(BP)
-#define tmpStoreAVX2 (7*32)(BP) // 256 bytes on stack
-#define AA0 Y0
-#define AA1 Y5
-#define AA2 Y6
-#define AA3 Y7
-#define BB0 Y14
-#define BB1 Y9
-#define BB2 Y10
-#define BB3 Y11
-#define CC0 Y12
-#define CC1 Y13
-#define CC2 Y8
-#define CC3 Y15
-#define DD0 Y4
-#define DD1 Y1
-#define DD2 Y2
-#define DD3 Y3
-#define TT0 DD3
-#define TT1 AA3
-#define TT2 BB3
-#define TT3 CC3
-// ChaCha20 constants
-DATA ·chacha20Constants<>+0x00(SB)/4, $0x61707865
-DATA ·chacha20Constants<>+0x04(SB)/4, $0x3320646e
-DATA ·chacha20Constants<>+0x08(SB)/4, $0x79622d32
-DATA ·chacha20Constants<>+0x0c(SB)/4, $0x6b206574
-DATA ·chacha20Constants<>+0x10(SB)/4, $0x61707865
-DATA ·chacha20Constants<>+0x14(SB)/4, $0x3320646e
-DATA ·chacha20Constants<>+0x18(SB)/4, $0x79622d32
-DATA ·chacha20Constants<>+0x1c(SB)/4, $0x6b206574
-// <<< 16 with PSHUFB
-DATA ·rol16<>+0x00(SB)/8, $0x0504070601000302
-DATA ·rol16<>+0x08(SB)/8, $0x0D0C0F0E09080B0A
-DATA ·rol16<>+0x10(SB)/8, $0x0504070601000302
-DATA ·rol16<>+0x18(SB)/8, $0x0D0C0F0E09080B0A
-// <<< 8 with PSHUFB
-DATA ·rol8<>+0x00(SB)/8, $0x0605040702010003
-DATA ·rol8<>+0x08(SB)/8, $0x0E0D0C0F0A09080B
-DATA ·rol8<>+0x10(SB)/8, $0x0605040702010003
-DATA ·rol8<>+0x18(SB)/8, $0x0E0D0C0F0A09080B
 
-DATA ·avx2InitMask<>+0x00(SB)/8, $0x0
-DATA ·avx2InitMask<>+0x08(SB)/8, $0x0
-DATA ·avx2InitMask<>+0x10(SB)/8, $0x1
-DATA ·avx2InitMask<>+0x18(SB)/8, $0x0
-
-DATA ·avx2IncMask<>+0x00(SB)/8, $0x2
-DATA ·avx2IncMask<>+0x08(SB)/8, $0x0
-DATA ·avx2IncMask<>+0x10(SB)/8, $0x2
-DATA ·avx2IncMask<>+0x18(SB)/8, $0x0
-// Poly1305 key clamp
-DATA ·polyClampMask<>+0x00(SB)/8, $0x0FFFFFFC0FFFFFFF
-DATA ·polyClampMask<>+0x08(SB)/8, $0x0FFFFFFC0FFFFFFC
-DATA ·polyClampMask<>+0x10(SB)/8, $0xFFFFFFFFFFFFFFFF
-DATA ·polyClampMask<>+0x18(SB)/8, $0xFFFFFFFFFFFFFFFF
-
-DATA ·sseIncMask<>+0x00(SB)/8, $0x1
-DATA ·sseIncMask<>+0x08(SB)/8, $0x0
-// To load/store the last < 16 bytes in a buffer
-DATA ·andMask<>+0x00(SB)/8, $0x00000000000000ff
-DATA ·andMask<>+0x08(SB)/8, $0x0000000000000000
-DATA ·andMask<>+0x10(SB)/8, $0x000000000000ffff
-DATA ·andMask<>+0x18(SB)/8, $0x0000000000000000
-DATA ·andMask<>+0x20(SB)/8, $0x0000000000ffffff
-DATA ·andMask<>+0x28(SB)/8, $0x0000000000000000
-DATA ·andMask<>+0x30(SB)/8, $0x00000000ffffffff
-DATA ·andMask<>+0x38(SB)/8, $0x0000000000000000
-DATA ·andMask<>+0x40(SB)/8, $0x000000ffffffffff
-DATA ·andMask<>+0x48(SB)/8, $0x0000000000000000
-DATA ·andMask<>+0x50(SB)/8, $0x0000ffffffffffff
-DATA ·andMask<>+0x58(SB)/8, $0x0000000000000000
-DATA ·andMask<>+0x60(SB)/8, $0x00ffffffffffffff
-DATA ·andMask<>+0x68(SB)/8, $0x0000000000000000
-DATA ·andMask<>+0x70(SB)/8, $0xffffffffffffffff
-DATA ·andMask<>+0x78(SB)/8, $0x0000000000000000
-DATA ·andMask<>+0x80(SB)/8, $0xffffffffffffffff
-DATA ·andMask<>+0x88(SB)/8, $0x00000000000000ff
-DATA ·andMask<>+0x90(SB)/8, $0xffffffffffffffff
-DATA ·andMask<>+0x98(SB)/8, $0x000000000000ffff
-DATA ·andMask<>+0xa0(SB)/8, $0xffffffffffffffff
-DATA ·andMask<>+0xa8(SB)/8, $0x0000000000ffffff
-DATA ·andMask<>+0xb0(SB)/8, $0xffffffffffffffff
-DATA ·andMask<>+0xb8(SB)/8, $0x00000000ffffffff
-DATA ·andMask<>+0xc0(SB)/8, $0xffffffffffffffff
-DATA ·andMask<>+0xc8(SB)/8, $0x000000ffffffffff
-DATA ·andMask<>+0xd0(SB)/8, $0xffffffffffffffff
-DATA ·andMask<>+0xd8(SB)/8, $0x0000ffffffffffff
-DATA ·andMask<>+0xe0(SB)/8, $0xffffffffffffffff
-DATA ·andMask<>+0xe8(SB)/8, $0x00ffffffffffffff
-
-GLOBL ·chacha20Constants<>(SB), (NOPTR+RODATA), $32
-GLOBL ·rol16<>(SB), (NOPTR+RODATA), $32
-GLOBL ·rol8<>(SB), (NOPTR+RODATA), $32
-GLOBL ·sseIncMask<>(SB), (NOPTR+RODATA), $16
-GLOBL ·avx2IncMask<>(SB), (NOPTR+RODATA), $32
-GLOBL ·avx2InitMask<>(SB), (NOPTR+RODATA), $32
-GLOBL ·polyClampMask<>(SB), (NOPTR+RODATA), $32
-GLOBL ·andMask<>(SB), (NOPTR+RODATA), $240
-// No PALIGNR in Go ASM yet (but VPALIGNR is present).
-#define shiftB0Left BYTE $0x66; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xdb; BYTE $0x04 // PALIGNR $4, X3, X3
-#define shiftB1Left BYTE $0x66; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xe4; BYTE $0x04 // PALIGNR $4, X4, X4
-#define shiftB2Left BYTE $0x66; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xed; BYTE $0x04 // PALIGNR $4, X5, X5
-#define shiftB3Left BYTE $0x66; BYTE $0x45; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xed; BYTE $0x04 // PALIGNR $4, X13, X13
-#define shiftC0Left BYTE $0x66; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xf6; BYTE $0x08 // PALIGNR $8, X6, X6
-#define shiftC1Left BYTE $0x66; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xff; BYTE $0x08 // PALIGNR $8, X7, X7
-#define shiftC2Left BYTE $0x66; BYTE $0x45; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xc0; BYTE $0x08 // PALIGNR $8, X8, X8
-#define shiftC3Left BYTE $0x66; BYTE $0x45; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xf6; BYTE $0x08 // PALIGNR $8, X14, X14
-#define shiftD0Left BYTE $0x66; BYTE $0x45; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xc9; BYTE $0x0c // PALIGNR $12, X9, X9
-#define shiftD1Left BYTE $0x66; BYTE $0x45; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xd2; BYTE $0x0c // PALIGNR $12, X10, X10
-#define shiftD2Left BYTE $0x66; BYTE $0x45; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xdb; BYTE $0x0c // PALIGNR $12, X11, X11
-#define shiftD3Left BYTE $0x66; BYTE $0x45; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xff; BYTE $0x0c // PALIGNR $12, X15, X15
-#define shiftB0Right BYTE $0x66; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xdb; BYTE $0x0c // PALIGNR $12, X3, X3
-#define shiftB1Right BYTE $0x66; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xe4; BYTE $0x0c // PALIGNR $12, X4, X4
-#define shiftB2Right BYTE $0x66; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xed; BYTE $0x0c // PALIGNR $12, X5, X5
-#define shiftB3Right BYTE $0x66; BYTE $0x45; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xed; BYTE $0x0c // PALIGNR $12, X13, X13
-#define shiftC0Right shiftC0Left
-#define shiftC1Right shiftC1Left
-#define shiftC2Right shiftC2Left
-#define shiftC3Right shiftC3Left
-#define shiftD0Right BYTE $0x66; BYTE $0x45; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xc9; BYTE $0x04 // PALIGNR $4, X9, X9
-#define shiftD1Right BYTE $0x66; BYTE $0x45; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xd2; BYTE $0x04 // PALIGNR $4, X10, X10
-#define shiftD2Right BYTE $0x66; BYTE $0x45; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xdb; BYTE $0x04 // PALIGNR $4, X11, X11
-#define shiftD3Right BYTE $0x66; BYTE $0x45; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xff; BYTE $0x04 // PALIGNR $4, X15, X15
-
-// Some macros
-
-// ROL rotates the uint32s in register R left by N bits, using temporary T.
-#define ROL(N, R, T) \
-	MOVO R, T; PSLLL $(N), T; PSRLL $(32-(N)), R; PXOR T, R
-
-// ROL16 rotates the uint32s in register R left by 16, using temporary T if needed.
-#ifdef GOAMD64_v2
-#define ROL16(R, T) PSHUFB ·rol16<>(SB), R
-#else
-#define ROL16(R, T) ROL(16, R, T)
-#endif
-
-// ROL8 rotates the uint32s in register R left by 8, using temporary T if needed.
-#ifdef GOAMD64_v2
-#define ROL8(R, T) PSHUFB ·rol8<>(SB), R
-#else
-#define ROL8(R, T) ROL(8, R, T)
-#endif
-
-#define chachaQR(A, B, C, D, T) \
-	PADDD B, A; PXOR A, D; ROL16(D, T) \
-	PADDD D, C; PXOR C, B; MOVO B, T; PSLLL $12, T; PSRLL $20, B; PXOR T, B \
-	PADDD B, A; PXOR A, D; ROL8(D, T) \
-	PADDD D, C; PXOR C, B; MOVO B, T; PSLLL $7, T; PSRLL $25, B; PXOR T, B
-
-#define chachaQR_AVX2(A, B, C, D, T) \
-	VPADDD B, A, A; VPXOR A, D, D; VPSHUFB ·rol16<>(SB), D, D                         \
-	VPADDD D, C, C; VPXOR C, B, B; VPSLLD $12, B, T; VPSRLD $20, B, B; VPXOR T, B, B \
-	VPADDD B, A, A; VPXOR A, D, D; VPSHUFB ·rol8<>(SB), D, D                          \
-	VPADDD D, C, C; VPXOR C, B, B; VPSLLD $7, B, T; VPSRLD $25, B, B; VPXOR T, B, B
-
-#define polyAdd(S) ADDQ S, acc0; ADCQ 8+S, acc1; ADCQ $1, acc2
-#define polyMulStage1 MOVQ (0*8)(BP), AX; MOVQ AX, t2; MULQ acc0; MOVQ AX, t0; MOVQ DX, t1; MOVQ (0*8)(BP), AX; MULQ acc1; IMULQ acc2, t2; ADDQ AX, t1; ADCQ DX, t2
-#define polyMulStage2 MOVQ (1*8)(BP), AX; MOVQ AX, t3; MULQ acc0; ADDQ AX, t1; ADCQ $0, DX; MOVQ DX, acc0; MOVQ (1*8)(BP), AX; MULQ acc1; ADDQ AX, t2; ADCQ $0, DX
-#define polyMulStage3 IMULQ acc2, t3; ADDQ acc0, t2; ADCQ DX, t3
-#define polyMulReduceStage MOVQ t0, acc0; MOVQ t1, acc1; MOVQ t2, acc2; ANDQ $3, acc2; MOVQ t2, t0; ANDQ $-4, t0; MOVQ t3, t1; SHRQ $2, t3, t2; SHRQ $2, t3; ADDQ t0, acc0; ADCQ t1, acc1; ADCQ $0, acc2; ADDQ t2, acc0; ADCQ t3, acc1; ADCQ $0, acc2
-
-#define polyMulStage1_AVX2 MOVQ (0*8)(BP), DX; MOVQ DX, t2; MULXQ acc0, t0, t1; IMULQ acc2, t2; MULXQ acc1, AX, DX; ADDQ AX, t1; ADCQ DX, t2
-#define polyMulStage2_AVX2 MOVQ (1*8)(BP), DX; MULXQ acc0, acc0, AX; ADDQ acc0, t1; MULXQ acc1, acc1, t3; ADCQ acc1, t2; ADCQ $0, t3
-#define polyMulStage3_AVX2 IMULQ acc2, DX; ADDQ AX, t2; ADCQ DX, t3
-
-#define polyMul polyMulStage1; polyMulStage2; polyMulStage3; polyMulReduceStage
-#define polyMulAVX2 polyMulStage1_AVX2; polyMulStage2_AVX2; polyMulStage3_AVX2; polyMulReduceStage
-// ----------------------------------------------------------------------------
+// func polyHashADInternal<>()
 TEXT polyHashADInternal<>(SB), NOSPLIT, $0
-	// adp points to beginning of additional data
-	// itr2 holds ad length
-	XORQ acc0, acc0
-	XORQ acc1, acc1
-	XORQ acc2, acc2
-	CMPQ itr2, $13
-	JNE  hashADLoop
+	// Hack: Must declare #define macros inside of a function due to Avo constraints
+	// ROL rotates the uint32s in register R left by N bits, using temporary T.
+	#define ROL(N, R, T) \
+		MOVO R, T; \
+		PSLLL $(N), T; \
+		PSRLL $(32-(N)), R; \
+		PXOR T, R
 
-openFastTLSAD:
-	// Special treatment for the TLS case of 13 bytes
-	MOVQ (adp), acc0
-	MOVQ 5(adp), acc1
-	SHRQ $24, acc1
-	MOVQ $1, acc2
-	polyMul
+	// ROL8 rotates the uint32s in register R left by 8, using temporary T if needed.
+	#ifdef GOAMD64_v2
+		#define ROL8(R, T) PSHUFB ·rol8<>(SB), R
+	#else
+		#define ROL8(R, T) ROL(8, R, T)
+	#endif
+
+	// ROL16 rotates the uint32s in register R left by 16, using temporary T if needed.
+	#ifdef GOAMD64_v2
+		#define ROL16(R, T) PSHUFB ·rol16<>(SB), R
+	#else
+		#define ROL16(R, T) ROL(16, R, T)
+	#endif
+	XORQ  R10, R10
+	XORQ  R11, R11
+	XORQ  R12, R12
+	CMPQ  R9, $0x0d
+	JNE   hashADLoop
+	MOVQ  (CX), R10
+	MOVQ  5(CX), R11
+	SHRQ  $0x18, R11
+	MOVQ  $0x00000001, R12
+	MOVQ  (BP), AX
+	MOVQ  AX, R15
+	MULQ  R10
+	MOVQ  AX, R13
+	MOVQ  DX, R14
+	MOVQ  (BP), AX
+	MULQ  R11
+	IMULQ R12, R15
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), AX
+	MOVQ  AX, R8
+	MULQ  R10
+	ADDQ  AX, R14
+	ADCQ  $0x00, DX
+	MOVQ  DX, R10
+	MOVQ  8(BP), AX
+	MULQ  R11
+	ADDQ  AX, R15
+	ADCQ  $0x00, DX
+	IMULQ R12, R8
+	ADDQ  R10, R15
+	ADCQ  DX, R8
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
 	RET
 
 hashADLoop:
 	// Hash in 16 byte chunks
-	CMPQ itr2, $16
-	JB   hashADTail
-	polyAdd(0(adp))
-	LEAQ (1*16)(adp), adp
-	SUBQ $16, itr2
-	polyMul
-	JMP  hashADLoop
+	CMPQ  R9, $0x10
+	JB    hashADTail
+	ADDQ  (CX), R10
+	ADCQ  8(CX), R11
+	ADCQ  $0x01, R12
+	LEAQ  16(CX), CX
+	SUBQ  $0x10, R9
+	MOVQ  (BP), AX
+	MOVQ  AX, R15
+	MULQ  R10
+	MOVQ  AX, R13
+	MOVQ  DX, R14
+	MOVQ  (BP), AX
+	MULQ  R11
+	IMULQ R12, R15
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), AX
+	MOVQ  AX, R8
+	MULQ  R10
+	ADDQ  AX, R14
+	ADCQ  $0x00, DX
+	MOVQ  DX, R10
+	MOVQ  8(BP), AX
+	MULQ  R11
+	ADDQ  AX, R15
+	ADCQ  $0x00, DX
+	IMULQ R12, R8
+	ADDQ  R10, R15
+	ADCQ  DX, R8
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
+	JMP   hashADLoop
 
 hashADTail:
-	CMPQ itr2, $0
+	CMPQ R9, $0x00
 	JE   hashADDone
 
 	// Hash last < 16 byte tail
-	XORQ t0, t0
-	XORQ t1, t1
-	XORQ t2, t2
-	ADDQ itr2, adp
+	XORQ R13, R13
+	XORQ R14, R14
+	XORQ R15, R15
+	ADDQ R9, CX
 
 hashADTailLoop:
-	SHLQ $8, t0, t1
-	SHLQ $8, t0
-	MOVB -1(adp), t2
-	XORQ t2, t0
-	DECQ adp
-	DECQ itr2
-	JNE  hashADTailLoop
+	SHLQ  $0x08, R13, R14
+	SHLQ  $0x08, R13
+	MOVB  -1(CX), R15
+	XORQ  R15, R13
+	DECQ  CX
+	DECQ  R9
+	JNE   hashADTailLoop
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x01, R12
+	MOVQ  (BP), AX
+	MOVQ  AX, R15
+	MULQ  R10
+	MOVQ  AX, R13
+	MOVQ  DX, R14
+	MOVQ  (BP), AX
+	MULQ  R11
+	IMULQ R12, R15
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), AX
+	MOVQ  AX, R8
+	MULQ  R10
+	ADDQ  AX, R14
+	ADCQ  $0x00, DX
+	MOVQ  DX, R10
+	MOVQ  8(BP), AX
+	MULQ  R11
+	ADDQ  AX, R15
+	ADCQ  $0x00, DX
+	IMULQ R12, R8
+	ADDQ  R10, R15
+	ADCQ  DX, R8
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
 
-hashADTailFinish:
-	ADDQ t0, acc0; ADCQ t1, acc1; ADCQ $1, acc2
-	polyMul
-
-	// Finished AD
 hashADDone:
 	RET
 
-// ----------------------------------------------------------------------------
-// func chacha20Poly1305Open(dst, key, src, ad []byte) bool
-TEXT ·chacha20Poly1305Open(SB), 0, $288-97
+// func chacha20Poly1305Open(dst []byte, key []uint32, src []byte, ad []byte) bool
+// Requires: AVX, AVX2, BMI2, CMOV, SSE2
+TEXT ·chacha20Poly1305Open(SB), $288-97
 	// For aligned stack access
 	MOVQ SP, BP
-	ADDQ $32, BP
+	ADDQ $0x20, BP
 	ANDQ $-32, BP
-	MOVQ dst+0(FP), oup
-	MOVQ key+24(FP), keyp
-	MOVQ src+48(FP), inp
-	MOVQ src_len+56(FP), inl
-	MOVQ ad+72(FP), adp
+	MOVQ dst_base+0(FP), DI
+	MOVQ key_base+24(FP), R8
+	MOVQ src_base+48(FP), SI
+	MOVQ src_len+56(FP), BX
+	MOVQ ad_base+72(FP), CX
 
 	// Check for AVX2 support
-	CMPB ·useAVX2(SB), $1
+	CMPB ·useAVX2+0(SB), $0x01
 	JE   chacha20Poly1305Open_AVX2
 
 	// Special optimization, for very short buffers
-	CMPQ inl, $128
-	JBE  openSSE128 // About 16% faster
+	CMPQ BX, $0x80
+	JBE  openSSE128
 
 	// For long buffers, prepare the poly key first
-	MOVOU ·chacha20Constants<>(SB), A0
-	MOVOU (1*16)(keyp), B0
-	MOVOU (2*16)(keyp), C0
-	MOVOU (3*16)(keyp), D0
-	MOVO  D0, T1
+	MOVOU ·chacha20Constants<>+0(SB), X0
+	MOVOU 16(R8), X3
+	MOVOU 32(R8), X6
+	MOVOU 48(R8), X9
+	MOVO  X9, X13
 
 	// Store state on stack for future use
-	MOVO B0, state1Store
-	MOVO C0, state2Store
-	MOVO D0, ctr3Store
-	MOVQ $10, itr2
+	MOVO X3, 32(BP)
+	MOVO X6, 48(BP)
+	MOVO X9, 128(BP)
+	MOVQ $0x0000000a, R9
 
 openSSEPreparePolyKey:
-	chachaQR(A0, B0, C0, D0, T0)
-	shiftB0Left;  shiftC0Left; shiftD0Left
-	chachaQR(A0, B0, C0, D0, T0)
-	shiftB0Right; shiftC0Right; shiftD0Right
-	DECQ          itr2
-	JNE           openSSEPreparePolyKey
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL16(X9, X12)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X12
+	PSLLL $0x0c, X12
+	PSRLL $0x14, X3
+	PXOR  X12, X3
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL8(X9, X12)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X12
+	PSLLL $0x07, X12
+	PSRLL $0x19, X3
+	PXOR  X12, X3
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xdb
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xf6
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xc9
+	BYTE  $0x0c
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL16(X9, X12)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X12
+	PSLLL $0x0c, X12
+	PSRLL $0x14, X3
+	PXOR  X12, X3
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL8(X9, X12)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X12
+	PSLLL $0x07, X12
+	PSRLL $0x19, X3
+	PXOR  X12, X3
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xdb
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xf6
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xc9
+	BYTE  $0x04
+	DECQ  R9
+	JNE   openSSEPreparePolyKey
 
 	// A0|B0 hold the Poly1305 32-byte key, C0,D0 can be discarded
-	PADDL ·chacha20Constants<>(SB), A0; PADDL state1Store, B0
+	PADDL ·chacha20Constants<>+0(SB), X0
+	PADDL 32(BP), X3
 
 	// Clamp and store the key
-	PAND ·polyClampMask<>(SB), A0
-	MOVO A0, rStore; MOVO B0, sStore
+	PAND ·polyClampMask<>+0(SB), X0
+	MOVO X0, (BP)
+	MOVO X3, 16(BP)
 
 	// Hash AAD
-	MOVQ ad_len+80(FP), itr2
+	MOVQ ad_len+80(FP), R9
 	CALL polyHashADInternal<>(SB)
 
 openSSEMainLoop:
-	CMPQ inl, $256
+	CMPQ BX, $0x00000100
 	JB   openSSEMainLoopDone
 
 	// Load state, increment counter blocks
-	MOVO ·chacha20Constants<>(SB), A0; MOVO state1Store, B0; MOVO state2Store, C0; MOVO ctr3Store, D0; PADDL ·sseIncMask<>(SB), D0
-	MOVO A0, A1; MOVO B0, B1; MOVO C0, C1; MOVO D0, D1; PADDL ·sseIncMask<>(SB), D1
-	MOVO A1, A2; MOVO B1, B2; MOVO C1, C2; MOVO D1, D2; PADDL ·sseIncMask<>(SB), D2
-	MOVO A2, A3; MOVO B2, B3; MOVO C2, C3; MOVO D2, D3; PADDL ·sseIncMask<>(SB), D3
+	MOVO  ·chacha20Constants<>+0(SB), X0
+	MOVO  32(BP), X3
+	MOVO  48(BP), X6
+	MOVO  128(BP), X9
+	PADDL ·sseIncMask<>+0(SB), X9
+	MOVO  X0, X1
+	MOVO  X3, X4
+	MOVO  X6, X7
+	MOVO  X9, X10
+	PADDL ·sseIncMask<>+0(SB), X10
+	MOVO  X1, X2
+	MOVO  X4, X5
+	MOVO  X7, X8
+	MOVO  X10, X11
+	PADDL ·sseIncMask<>+0(SB), X11
+	MOVO  X2, X12
+	MOVO  X5, X13
+	MOVO  X8, X14
+	MOVO  X11, X15
+	PADDL ·sseIncMask<>+0(SB), X15
 
 	// Store counters
-	MOVO D0, ctr0Store; MOVO D1, ctr1Store; MOVO D2, ctr2Store; MOVO D3, ctr3Store
+	MOVO X9, 80(BP)
+	MOVO X10, 96(BP)
+	MOVO X11, 112(BP)
+	MOVO X15, 128(BP)
 
-	// There are 10 ChaCha20 iterations of 2QR each, so for 6 iterations we hash 2 blocks, and for the remaining 4 only 1 block - for a total of 16
-	MOVQ $4, itr1
-	MOVQ inp, itr2
+	// There are 10 ChaCha20 iterations of 2QR each, so for 6 iterations we hash
+	// 2 blocks, and for the remaining 4 only 1 block - for a total of 16
+	MOVQ $0x00000004, CX
+	MOVQ SI, R9
 
 openSSEInternalLoop:
-	MOVO          C3, tmpStore
-	chachaQR(A0, B0, C0, D0, C3); chachaQR(A1, B1, C1, D1, C3); chachaQR(A2, B2, C2, D2, C3)
-	MOVO          tmpStore, C3
-	MOVO          C1, tmpStore
-	chachaQR(A3, B3, C3, D3, C1)
-	MOVO          tmpStore, C1
-	polyAdd(0(itr2))
-	shiftB0Left;  shiftB1Left; shiftB2Left; shiftB3Left
-	shiftC0Left;  shiftC1Left; shiftC2Left; shiftC3Left
-	shiftD0Left;  shiftD1Left; shiftD2Left; shiftD3Left
-	polyMulStage1
-	polyMulStage2
-	LEAQ          (2*8)(itr2), itr2
-	MOVO          C3, tmpStore
-	chachaQR(A0, B0, C0, D0, C3); chachaQR(A1, B1, C1, D1, C3); chachaQR(A2, B2, C2, D2, C3)
-	MOVO          tmpStore, C3
-	MOVO          C1, tmpStore
-	polyMulStage3
-	chachaQR(A3, B3, C3, D3, C1)
-	MOVO          tmpStore, C1
-	polyMulReduceStage
-	shiftB0Right; shiftB1Right; shiftB2Right; shiftB3Right
-	shiftC0Right; shiftC1Right; shiftC2Right; shiftC3Right
-	shiftD0Right; shiftD1Right; shiftD2Right; shiftD3Right
-	DECQ          itr1
-	JGE           openSSEInternalLoop
-
-	polyAdd(0(itr2))
-	polyMul
-	LEAQ (2*8)(itr2), itr2
-
-	CMPQ itr1, $-6
-	JG   openSSEInternalLoop
+	MOVO  X14, 64(BP)
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL16(X9, X14)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X14
+	PSLLL $0x0c, X14
+	PSRLL $0x14, X3
+	PXOR  X14, X3
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL8(X9, X14)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X14
+	PSLLL $0x07, X14
+	PSRLL $0x19, X3
+	PXOR  X14, X3
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL16(X10, X14)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X14
+	PSLLL $0x0c, X14
+	PSRLL $0x14, X4
+	PXOR  X14, X4
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL8(X10, X14)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X14
+	PSLLL $0x07, X14
+	PSRLL $0x19, X4
+	PXOR  X14, X4
+	PADDD X5, X2
+	PXOR  X2, X11
+	ROL16(X11, X14)
+	PADDD X11, X8
+	PXOR  X8, X5
+	MOVO  X5, X14
+	PSLLL $0x0c, X14
+	PSRLL $0x14, X5
+	PXOR  X14, X5
+	PADDD X5, X2
+	PXOR  X2, X11
+	ROL8(X11, X14)
+	PADDD X11, X8
+	PXOR  X8, X5
+	MOVO  X5, X14
+	PSLLL $0x07, X14
+	PSRLL $0x19, X5
+	PXOR  X14, X5
+	MOVO  64(BP), X14
+	MOVO  X7, 64(BP)
+	PADDD X13, X12
+	PXOR  X12, X15
+	ROL16(X15, X7)
+	PADDD X15, X14
+	PXOR  X14, X13
+	MOVO  X13, X7
+	PSLLL $0x0c, X7
+	PSRLL $0x14, X13
+	PXOR  X7, X13
+	PADDD X13, X12
+	PXOR  X12, X15
+	ROL8(X15, X7)
+	PADDD X15, X14
+	PXOR  X14, X13
+	MOVO  X13, X7
+	PSLLL $0x07, X7
+	PSRLL $0x19, X13
+	PXOR  X7, X13
+	MOVO  64(BP), X7
+	ADDQ  (R9), R10
+	ADCQ  8(R9), R11
+	ADCQ  $0x01, R12
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xdb
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xe4
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xed
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xed
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xf6
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xff
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xc0
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xf6
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xc9
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xd2
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xdb
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xff
+	BYTE  $0x0c
+	MOVQ  (BP), AX
+	MOVQ  AX, R15
+	MULQ  R10
+	MOVQ  AX, R13
+	MOVQ  DX, R14
+	MOVQ  (BP), AX
+	MULQ  R11
+	IMULQ R12, R15
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), AX
+	MOVQ  AX, R8
+	MULQ  R10
+	ADDQ  AX, R14
+	ADCQ  $0x00, DX
+	MOVQ  DX, R10
+	MOVQ  8(BP), AX
+	MULQ  R11
+	ADDQ  AX, R15
+	ADCQ  $0x00, DX
+	LEAQ  16(R9), R9
+	MOVO  X14, 64(BP)
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL16(X9, X14)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X14
+	PSLLL $0x0c, X14
+	PSRLL $0x14, X3
+	PXOR  X14, X3
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL8(X9, X14)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X14
+	PSLLL $0x07, X14
+	PSRLL $0x19, X3
+	PXOR  X14, X3
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL16(X10, X14)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X14
+	PSLLL $0x0c, X14
+	PSRLL $0x14, X4
+	PXOR  X14, X4
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL8(X10, X14)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X14
+	PSLLL $0x07, X14
+	PSRLL $0x19, X4
+	PXOR  X14, X4
+	PADDD X5, X2
+	PXOR  X2, X11
+	ROL16(X11, X14)
+	PADDD X11, X8
+	PXOR  X8, X5
+	MOVO  X5, X14
+	PSLLL $0x0c, X14
+	PSRLL $0x14, X5
+	PXOR  X14, X5
+	PADDD X5, X2
+	PXOR  X2, X11
+	ROL8(X11, X14)
+	PADDD X11, X8
+	PXOR  X8, X5
+	MOVO  X5, X14
+	PSLLL $0x07, X14
+	PSRLL $0x19, X5
+	PXOR  X14, X5
+	MOVO  64(BP), X14
+	MOVO  X7, 64(BP)
+	IMULQ R12, R8
+	ADDQ  R10, R15
+	ADCQ  DX, R8
+	PADDD X13, X12
+	PXOR  X12, X15
+	ROL16(X15, X7)
+	PADDD X15, X14
+	PXOR  X14, X13
+	MOVO  X13, X7
+	PSLLL $0x0c, X7
+	PSRLL $0x14, X13
+	PXOR  X7, X13
+	PADDD X13, X12
+	PXOR  X12, X15
+	ROL8(X15, X7)
+	PADDD X15, X14
+	PXOR  X14, X13
+	MOVO  X13, X7
+	PSLLL $0x07, X7
+	PSRLL $0x19, X13
+	PXOR  X7, X13
+	MOVO  64(BP), X7
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xdb
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xe4
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xed
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xed
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xf6
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xff
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xc0
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xf6
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xc9
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xd2
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xdb
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xff
+	BYTE  $0x04
+	DECQ  CX
+	JGE   openSSEInternalLoop
+	ADDQ  (R9), R10
+	ADCQ  8(R9), R11
+	ADCQ  $0x01, R12
+	MOVQ  (BP), AX
+	MOVQ  AX, R15
+	MULQ  R10
+	MOVQ  AX, R13
+	MOVQ  DX, R14
+	MOVQ  (BP), AX
+	MULQ  R11
+	IMULQ R12, R15
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), AX
+	MOVQ  AX, R8
+	MULQ  R10
+	ADDQ  AX, R14
+	ADCQ  $0x00, DX
+	MOVQ  DX, R10
+	MOVQ  8(BP), AX
+	MULQ  R11
+	ADDQ  AX, R15
+	ADCQ  $0x00, DX
+	IMULQ R12, R8
+	ADDQ  R10, R15
+	ADCQ  DX, R8
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
+	LEAQ  16(R9), R9
+	CMPQ  CX, $-6
+	JG    openSSEInternalLoop
 
 	// Add in the state
-	PADDD ·chacha20Constants<>(SB), A0; PADDD ·chacha20Constants<>(SB), A1; PADDD ·chacha20Constants<>(SB), A2; PADDD ·chacha20Constants<>(SB), A3
-	PADDD state1Store, B0; PADDD state1Store, B1; PADDD state1Store, B2; PADDD state1Store, B3
-	PADDD state2Store, C0; PADDD state2Store, C1; PADDD state2Store, C2; PADDD state2Store, C3
-	PADDD ctr0Store, D0; PADDD ctr1Store, D1; PADDD ctr2Store, D2; PADDD ctr3Store, D3
+	PADDD ·chacha20Constants<>+0(SB), X0
+	PADDD ·chacha20Constants<>+0(SB), X1
+	PADDD ·chacha20Constants<>+0(SB), X2
+	PADDD ·chacha20Constants<>+0(SB), X12
+	PADDD 32(BP), X3
+	PADDD 32(BP), X4
+	PADDD 32(BP), X5
+	PADDD 32(BP), X13
+	PADDD 48(BP), X6
+	PADDD 48(BP), X7
+	PADDD 48(BP), X8
+	PADDD 48(BP), X14
+	PADDD 80(BP), X9
+	PADDD 96(BP), X10
+	PADDD 112(BP), X11
+	PADDD 128(BP), X15
 
 	// Load - xor - store
-	MOVO  D3, tmpStore
-	MOVOU (0*16)(inp), D3; PXOR D3, A0; MOVOU A0, (0*16)(oup)
-	MOVOU (1*16)(inp), D3; PXOR D3, B0; MOVOU B0, (1*16)(oup)
-	MOVOU (2*16)(inp), D3; PXOR D3, C0; MOVOU C0, (2*16)(oup)
-	MOVOU (3*16)(inp), D3; PXOR D3, D0; MOVOU D0, (3*16)(oup)
-	MOVOU (4*16)(inp), D0; PXOR D0, A1; MOVOU A1, (4*16)(oup)
-	MOVOU (5*16)(inp), D0; PXOR D0, B1; MOVOU B1, (5*16)(oup)
-	MOVOU (6*16)(inp), D0; PXOR D0, C1; MOVOU C1, (6*16)(oup)
-	MOVOU (7*16)(inp), D0; PXOR D0, D1; MOVOU D1, (7*16)(oup)
-	MOVOU (8*16)(inp), D0; PXOR D0, A2; MOVOU A2, (8*16)(oup)
-	MOVOU (9*16)(inp), D0; PXOR D0, B2; MOVOU B2, (9*16)(oup)
-	MOVOU (10*16)(inp), D0; PXOR D0, C2; MOVOU C2, (10*16)(oup)
-	MOVOU (11*16)(inp), D0; PXOR D0, D2; MOVOU D2, (11*16)(oup)
-	MOVOU (12*16)(inp), D0; PXOR D0, A3; MOVOU A3, (12*16)(oup)
-	MOVOU (13*16)(inp), D0; PXOR D0, B3; MOVOU B3, (13*16)(oup)
-	MOVOU (14*16)(inp), D0; PXOR D0, C3; MOVOU C3, (14*16)(oup)
-	MOVOU (15*16)(inp), D0; PXOR tmpStore, D0; MOVOU D0, (15*16)(oup)
-	LEAQ  256(inp), inp
-	LEAQ  256(oup), oup
-	SUBQ  $256, inl
+	MOVO  X15, 64(BP)
+	MOVOU (SI), X15
+	PXOR  X15, X0
+	MOVOU X0, (DI)
+	MOVOU 16(SI), X15
+	PXOR  X15, X3
+	MOVOU X3, 16(DI)
+	MOVOU 32(SI), X15
+	PXOR  X15, X6
+	MOVOU X6, 32(DI)
+	MOVOU 48(SI), X15
+	PXOR  X15, X9
+	MOVOU X9, 48(DI)
+	MOVOU 64(SI), X9
+	PXOR  X9, X1
+	MOVOU X1, 64(DI)
+	MOVOU 80(SI), X9
+	PXOR  X9, X4
+	MOVOU X4, 80(DI)
+	MOVOU 96(SI), X9
+	PXOR  X9, X7
+	MOVOU X7, 96(DI)
+	MOVOU 112(SI), X9
+	PXOR  X9, X10
+	MOVOU X10, 112(DI)
+	MOVOU 128(SI), X9
+	PXOR  X9, X2
+	MOVOU X2, 128(DI)
+	MOVOU 144(SI), X9
+	PXOR  X9, X5
+	MOVOU X5, 144(DI)
+	MOVOU 160(SI), X9
+	PXOR  X9, X8
+	MOVOU X8, 160(DI)
+	MOVOU 176(SI), X9
+	PXOR  X9, X11
+	MOVOU X11, 176(DI)
+	MOVOU 192(SI), X9
+	PXOR  X9, X12
+	MOVOU X12, 192(DI)
+	MOVOU 208(SI), X9
+	PXOR  X9, X13
+	MOVOU X13, 208(DI)
+	MOVOU 224(SI), X9
+	PXOR  X9, X14
+	MOVOU X14, 224(DI)
+	MOVOU 240(SI), X9
+	PXOR  64(BP), X9
+	MOVOU X9, 240(DI)
+	LEAQ  256(SI), SI
+	LEAQ  256(DI), DI
+	SUBQ  $0x00000100, BX
 	JMP   openSSEMainLoop
 
 openSSEMainLoopDone:
 	// Handle the various tail sizes efficiently
-	TESTQ inl, inl
+	TESTQ BX, BX
 	JE    openSSEFinalize
-	CMPQ  inl, $64
+	CMPQ  BX, $0x40
 	JBE   openSSETail64
-	CMPQ  inl, $128
+	CMPQ  BX, $0x80
 	JBE   openSSETail128
-	CMPQ  inl, $192
+	CMPQ  BX, $0xc0
 	JBE   openSSETail192
 	JMP   openSSETail256
 
 openSSEFinalize:
 	// Hash in the PT, AAD lengths
-	ADDQ ad_len+80(FP), acc0; ADCQ src_len+56(FP), acc1; ADCQ $1, acc2
-	polyMul
+	ADDQ  ad_len+80(FP), R10
+	ADCQ  src_len+56(FP), R11
+	ADCQ  $0x01, R12
+	MOVQ  (BP), AX
+	MOVQ  AX, R15
+	MULQ  R10
+	MOVQ  AX, R13
+	MOVQ  DX, R14
+	MOVQ  (BP), AX
+	MULQ  R11
+	IMULQ R12, R15
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), AX
+	MOVQ  AX, R8
+	MULQ  R10
+	ADDQ  AX, R14
+	ADCQ  $0x00, DX
+	MOVQ  DX, R10
+	MOVQ  8(BP), AX
+	MULQ  R11
+	ADDQ  AX, R15
+	ADCQ  $0x00, DX
+	IMULQ R12, R8
+	ADDQ  R10, R15
+	ADCQ  DX, R8
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
 
 	// Final reduce
-	MOVQ    acc0, t0
-	MOVQ    acc1, t1
-	MOVQ    acc2, t2
-	SUBQ    $-5, acc0
-	SBBQ    $-1, acc1
-	SBBQ    $3, acc2
-	CMOVQCS t0, acc0
-	CMOVQCS t1, acc1
-	CMOVQCS t2, acc2
+	MOVQ    R10, R13
+	MOVQ    R11, R14
+	MOVQ    R12, R15
+	SUBQ    $-5, R10
+	SBBQ    $-1, R11
+	SBBQ    $0x03, R12
+	CMOVQCS R13, R10
+	CMOVQCS R14, R11
+	CMOVQCS R15, R12
 
 	// Add in the "s" part of the key
-	ADDQ 0+sStore, acc0
-	ADCQ 8+sStore, acc1
+	ADDQ 16(BP), R10
+	ADCQ 24(BP), R11
 
 	// Finally, constant time compare to the tag at the end of the message
 	XORQ    AX, AX
-	MOVQ    $1, DX
-	XORQ    (0*8)(inp), acc0
-	XORQ    (1*8)(inp), acc1
-	ORQ     acc1, acc0
+	MOVQ    $0x00000001, DX
+	XORQ    (SI), R10
+	XORQ    8(SI), R11
+	ORQ     R11, R10
 	CMOVQEQ DX, AX
 
 	// Return true iff tags are equal
 	MOVB AX, ret+96(FP)
 	RET
 
-// ----------------------------------------------------------------------------
-// Special optimization for buffers smaller than 129 bytes
 openSSE128:
-	// For up to 128 bytes of ciphertext and 64 bytes for the poly key, we require to process three blocks
-	MOVOU ·chacha20Constants<>(SB), A0; MOVOU (1*16)(keyp), B0; MOVOU (2*16)(keyp), C0; MOVOU (3*16)(keyp), D0
-	MOVO  A0, A1; MOVO B0, B1; MOVO C0, C1; MOVO D0, D1; PADDL ·sseIncMask<>(SB), D1
-	MOVO  A1, A2; MOVO B1, B2; MOVO C1, C2; MOVO D1, D2; PADDL ·sseIncMask<>(SB), D2
-	MOVO  B0, T1; MOVO C0, T2; MOVO D1, T3
-	MOVQ  $10, itr2
+	MOVOU ·chacha20Constants<>+0(SB), X0
+	MOVOU 16(R8), X3
+	MOVOU 32(R8), X6
+	MOVOU 48(R8), X9
+	MOVO  X0, X1
+	MOVO  X3, X4
+	MOVO  X6, X7
+	MOVO  X9, X10
+	PADDL ·sseIncMask<>+0(SB), X10
+	MOVO  X1, X2
+	MOVO  X4, X5
+	MOVO  X7, X8
+	MOVO  X10, X11
+	PADDL ·sseIncMask<>+0(SB), X11
+	MOVO  X3, X13
+	MOVO  X6, X14
+	MOVO  X10, X15
+	MOVQ  $0x0000000a, R9
 
 openSSE128InnerCipherLoop:
-	chachaQR(A0, B0, C0, D0, T0); chachaQR(A1, B1, C1, D1, T0); chachaQR(A2, B2, C2, D2, T0)
-	shiftB0Left;  shiftB1Left; shiftB2Left
-	shiftC0Left;  shiftC1Left; shiftC2Left
-	shiftD0Left;  shiftD1Left; shiftD2Left
-	chachaQR(A0, B0, C0, D0, T0); chachaQR(A1, B1, C1, D1, T0); chachaQR(A2, B2, C2, D2, T0)
-	shiftB0Right; shiftB1Right; shiftB2Right
-	shiftC0Right; shiftC1Right; shiftC2Right
-	shiftD0Right; shiftD1Right; shiftD2Right
-	DECQ          itr2
-	JNE           openSSE128InnerCipherLoop
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL16(X9, X12)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X12
+	PSLLL $0x0c, X12
+	PSRLL $0x14, X3
+	PXOR  X12, X3
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL8(X9, X12)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X12
+	PSLLL $0x07, X12
+	PSRLL $0x19, X3
+	PXOR  X12, X3
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL16(X10, X12)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X12
+	PSLLL $0x0c, X12
+	PSRLL $0x14, X4
+	PXOR  X12, X4
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL8(X10, X12)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X12
+	PSLLL $0x07, X12
+	PSRLL $0x19, X4
+	PXOR  X12, X4
+	PADDD X5, X2
+	PXOR  X2, X11
+	ROL16(X11, X12)
+	PADDD X11, X8
+	PXOR  X8, X5
+	MOVO  X5, X12
+	PSLLL $0x0c, X12
+	PSRLL $0x14, X5
+	PXOR  X12, X5
+	PADDD X5, X2
+	PXOR  X2, X11
+	ROL8(X11, X12)
+	PADDD X11, X8
+	PXOR  X8, X5
+	MOVO  X5, X12
+	PSLLL $0x07, X12
+	PSRLL $0x19, X5
+	PXOR  X12, X5
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xdb
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xe4
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xed
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xf6
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xff
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xc0
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xc9
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xd2
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xdb
+	BYTE  $0x0c
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL16(X9, X12)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X12
+	PSLLL $0x0c, X12
+	PSRLL $0x14, X3
+	PXOR  X12, X3
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL8(X9, X12)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X12
+	PSLLL $0x07, X12
+	PSRLL $0x19, X3
+	PXOR  X12, X3
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL16(X10, X12)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X12
+	PSLLL $0x0c, X12
+	PSRLL $0x14, X4
+	PXOR  X12, X4
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL8(X10, X12)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X12
+	PSLLL $0x07, X12
+	PSRLL $0x19, X4
+	PXOR  X12, X4
+	PADDD X5, X2
+	PXOR  X2, X11
+	ROL16(X11, X12)
+	PADDD X11, X8
+	PXOR  X8, X5
+	MOVO  X5, X12
+	PSLLL $0x0c, X12
+	PSRLL $0x14, X5
+	PXOR  X12, X5
+	PADDD X5, X2
+	PXOR  X2, X11
+	ROL8(X11, X12)
+	PADDD X11, X8
+	PXOR  X8, X5
+	MOVO  X5, X12
+	PSLLL $0x07, X12
+	PSRLL $0x19, X5
+	PXOR  X12, X5
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xdb
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xe4
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xed
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xf6
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xff
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xc0
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xc9
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xd2
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xdb
+	BYTE  $0x04
+	DECQ  R9
+	JNE   openSSE128InnerCipherLoop
 
 	// A0|B0 hold the Poly1305 32-byte key, C0,D0 can be discarded
-	PADDL ·chacha20Constants<>(SB), A0; PADDL ·chacha20Constants<>(SB), A1; PADDL ·chacha20Constants<>(SB), A2
-	PADDL T1, B0; PADDL T1, B1; PADDL T1, B2
-	PADDL T2, C1; PADDL T2, C2
-	PADDL T3, D1; PADDL ·sseIncMask<>(SB), T3; PADDL T3, D2
+	PADDL ·chacha20Constants<>+0(SB), X0
+	PADDL ·chacha20Constants<>+0(SB), X1
+	PADDL ·chacha20Constants<>+0(SB), X2
+	PADDL X13, X3
+	PADDL X13, X4
+	PADDL X13, X5
+	PADDL X14, X7
+	PADDL X14, X8
+	PADDL X15, X10
+	PADDL ·sseIncMask<>+0(SB), X15
+	PADDL X15, X11
 
 	// Clamp and store the key
-	PAND  ·polyClampMask<>(SB), A0
-	MOVOU A0, rStore; MOVOU B0, sStore
+	PAND  ·polyClampMask<>+0(SB), X0
+	MOVOU X0, (BP)
+	MOVOU X3, 16(BP)
 
 	// Hash
-	MOVQ ad_len+80(FP), itr2
+	MOVQ ad_len+80(FP), R9
 	CALL polyHashADInternal<>(SB)
 
 openSSE128Open:
-	CMPQ inl, $16
+	CMPQ BX, $0x10
 	JB   openSSETail16
-	SUBQ $16, inl
+	SUBQ $0x10, BX
 
 	// Load for hashing
-	polyAdd(0(inp))
+	ADDQ (SI), R10
+	ADCQ 8(SI), R11
+	ADCQ $0x01, R12
 
 	// Load for decryption
-	MOVOU (inp), T0; PXOR T0, A1; MOVOU A1, (oup)
-	LEAQ  (1*16)(inp), inp
-	LEAQ  (1*16)(oup), oup
-	polyMul
+	MOVOU (SI), X12
+	PXOR  X12, X1
+	MOVOU X1, (DI)
+	LEAQ  16(SI), SI
+	LEAQ  16(DI), DI
+	MOVQ  (BP), AX
+	MOVQ  AX, R15
+	MULQ  R10
+	MOVQ  AX, R13
+	MOVQ  DX, R14
+	MOVQ  (BP), AX
+	MULQ  R11
+	IMULQ R12, R15
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), AX
+	MOVQ  AX, R8
+	MULQ  R10
+	ADDQ  AX, R14
+	ADCQ  $0x00, DX
+	MOVQ  DX, R10
+	MOVQ  8(BP), AX
+	MULQ  R11
+	ADDQ  AX, R15
+	ADCQ  $0x00, DX
+	IMULQ R12, R8
+	ADDQ  R10, R15
+	ADCQ  DX, R8
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
 
 	// Shift the stream "left"
-	MOVO B1, A1
-	MOVO C1, B1
-	MOVO D1, C1
-	MOVO A2, D1
-	MOVO B2, A2
-	MOVO C2, B2
-	MOVO D2, C2
+	MOVO X4, X1
+	MOVO X7, X4
+	MOVO X10, X7
+	MOVO X2, X10
+	MOVO X5, X2
+	MOVO X8, X5
+	MOVO X11, X8
 	JMP  openSSE128Open
 
 openSSETail16:
-	TESTQ inl, inl
+	TESTQ BX, BX
 	JE    openSSEFinalize
 
 	// We can safely load the CT from the end, because it is padded with the MAC
-	MOVQ   inl, itr2
-	SHLQ   $4, itr2
-	LEAQ   ·andMask<>(SB), t0
-	MOVOU  (inp), T0
-	ADDQ   inl, inp
-	PAND   -16(t0)(itr2*1), T0
-	MOVO   T0, 0+tmpStore
-	MOVQ   T0, t0
-	MOVQ   8+tmpStore, t1
-	PXOR   A1, T0
+	MOVQ  BX, R9
+	SHLQ  $0x04, R9
+	LEAQ  ·andMask<>+0(SB), R13
+	MOVOU (SI), X12
+	ADDQ  BX, SI
+	PAND  -16(R13)(R9*1), X12
+	MOVO  X12, 64(BP)
+	MOVQ  X12, R13
+	MOVQ  72(BP), R14
+	PXOR  X1, X12
 
 	// We can only store one byte at a time, since plaintext can be shorter than 16 bytes
 openSSETail16Store:
-	MOVQ T0, t3
-	MOVB t3, (oup)
-	PSRLDQ $1, T0
-	INCQ   oup
-	DECQ   inl
+	MOVQ   X12, R8
+	MOVB   R8, (DI)
+	PSRLDQ $0x01, X12
+	INCQ   DI
+	DECQ   BX
 	JNE    openSSETail16Store
-	ADDQ   t0, acc0; ADCQ t1, acc1; ADCQ $1, acc2
-	polyMul
+	ADDQ   R13, R10
+	ADCQ   R14, R11
+	ADCQ   $0x01, R12
+	MOVQ   (BP), AX
+	MOVQ   AX, R15
+	MULQ   R10
+	MOVQ   AX, R13
+	MOVQ   DX, R14
+	MOVQ   (BP), AX
+	MULQ   R11
+	IMULQ  R12, R15
+	ADDQ   AX, R14
+	ADCQ   DX, R15
+	MOVQ   8(BP), AX
+	MOVQ   AX, R8
+	MULQ   R10
+	ADDQ   AX, R14
+	ADCQ   $0x00, DX
+	MOVQ   DX, R10
+	MOVQ   8(BP), AX
+	MULQ   R11
+	ADDQ   AX, R15
+	ADCQ   $0x00, DX
+	IMULQ  R12, R8
+	ADDQ   R10, R15
+	ADCQ   DX, R8
+	MOVQ   R13, R10
+	MOVQ   R14, R11
+	MOVQ   R15, R12
+	ANDQ   $0x03, R12
+	MOVQ   R15, R13
+	ANDQ   $-4, R13
+	MOVQ   R8, R14
+	SHRQ   $0x02, R8, R15
+	SHRQ   $0x02, R8
+	ADDQ   R13, R10
+	ADCQ   R14, R11
+	ADCQ   $0x00, R12
+	ADDQ   R15, R10
+	ADCQ   R8, R11
+	ADCQ   $0x00, R12
 	JMP    openSSEFinalize
 
-// ----------------------------------------------------------------------------
-// Special optimization for the last 64 bytes of ciphertext
 openSSETail64:
-	// Need to decrypt up to 64 bytes - prepare single block
-	MOVO ·chacha20Constants<>(SB), A0; MOVO state1Store, B0; MOVO state2Store, C0; MOVO ctr3Store, D0; PADDL ·sseIncMask<>(SB), D0; MOVO D0, ctr0Store
-	XORQ itr2, itr2
-	MOVQ inl, itr1
-	CMPQ itr1, $16
-	JB   openSSETail64LoopB
+	MOVO  ·chacha20Constants<>+0(SB), X0
+	MOVO  32(BP), X3
+	MOVO  48(BP), X6
+	MOVO  128(BP), X9
+	PADDL ·sseIncMask<>+0(SB), X9
+	MOVO  X9, 80(BP)
+	XORQ  R9, R9
+	MOVQ  BX, CX
+	CMPQ  CX, $0x10
+	JB    openSSETail64LoopB
 
 openSSETail64LoopA:
-	// Perform ChaCha rounds, while hashing the remaining input
-	polyAdd(0(inp)(itr2*1))
-	polyMul
-	SUBQ $16, itr1
+	ADDQ  (SI)(R9*1), R10
+	ADCQ  8(SI)(R9*1), R11
+	ADCQ  $0x01, R12
+	MOVQ  (BP), AX
+	MOVQ  AX, R15
+	MULQ  R10
+	MOVQ  AX, R13
+	MOVQ  DX, R14
+	MOVQ  (BP), AX
+	MULQ  R11
+	IMULQ R12, R15
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), AX
+	MOVQ  AX, R8
+	MULQ  R10
+	ADDQ  AX, R14
+	ADCQ  $0x00, DX
+	MOVQ  DX, R10
+	MOVQ  8(BP), AX
+	MULQ  R11
+	ADDQ  AX, R15
+	ADCQ  $0x00, DX
+	IMULQ R12, R8
+	ADDQ  R10, R15
+	ADCQ  DX, R8
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
+	SUBQ  $0x10, CX
 
 openSSETail64LoopB:
-	ADDQ          $16, itr2
-	chachaQR(A0, B0, C0, D0, T0)
-	shiftB0Left;  shiftC0Left; shiftD0Left
-	chachaQR(A0, B0, C0, D0, T0)
-	shiftB0Right; shiftC0Right; shiftD0Right
-
-	CMPQ itr1, $16
-	JAE  openSSETail64LoopA
-
-	CMPQ itr2, $160
-	JNE  openSSETail64LoopB
-
-	PADDL ·chacha20Constants<>(SB), A0; PADDL state1Store, B0; PADDL state2Store, C0; PADDL ctr0Store, D0
+	ADDQ  $0x10, R9
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL16(X9, X12)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X12
+	PSLLL $0x0c, X12
+	PSRLL $0x14, X3
+	PXOR  X12, X3
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL8(X9, X12)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X12
+	PSLLL $0x07, X12
+	PSRLL $0x19, X3
+	PXOR  X12, X3
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xdb
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xf6
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xc9
+	BYTE  $0x0c
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL16(X9, X12)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X12
+	PSLLL $0x0c, X12
+	PSRLL $0x14, X3
+	PXOR  X12, X3
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL8(X9, X12)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X12
+	PSLLL $0x07, X12
+	PSRLL $0x19, X3
+	PXOR  X12, X3
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xdb
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xf6
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xc9
+	BYTE  $0x04
+	CMPQ  CX, $0x10
+	JAE   openSSETail64LoopA
+	CMPQ  R9, $0xa0
+	JNE   openSSETail64LoopB
+	PADDL ·chacha20Constants<>+0(SB), X0
+	PADDL 32(BP), X3
+	PADDL 48(BP), X6
+	PADDL 80(BP), X9
 
 openSSETail64DecLoop:
-	CMPQ  inl, $16
+	CMPQ  BX, $0x10
 	JB    openSSETail64DecLoopDone
-	SUBQ  $16, inl
-	MOVOU (inp), T0
-	PXOR  T0, A0
-	MOVOU A0, (oup)
-	LEAQ  16(inp), inp
-	LEAQ  16(oup), oup
-	MOVO  B0, A0
-	MOVO  C0, B0
-	MOVO  D0, C0
+	SUBQ  $0x10, BX
+	MOVOU (SI), X12
+	PXOR  X12, X0
+	MOVOU X0, (DI)
+	LEAQ  16(SI), SI
+	LEAQ  16(DI), DI
+	MOVO  X3, X0
+	MOVO  X6, X3
+	MOVO  X9, X6
 	JMP   openSSETail64DecLoop
 
 openSSETail64DecLoopDone:
-	MOVO A0, A1
+	MOVO X0, X1
 	JMP  openSSETail16
 
-// ----------------------------------------------------------------------------
-// Special optimization for the last 128 bytes of ciphertext
 openSSETail128:
-	// Need to decrypt up to 128 bytes - prepare two blocks
-	MOVO ·chacha20Constants<>(SB), A1; MOVO state1Store, B1; MOVO state2Store, C1; MOVO ctr3Store, D1; PADDL ·sseIncMask<>(SB), D1; MOVO D1, ctr0Store
-	MOVO A1, A0; MOVO B1, B0; MOVO C1, C0; MOVO D1, D0; PADDL ·sseIncMask<>(SB), D0; MOVO D0, ctr1Store
-	XORQ itr2, itr2
-	MOVQ inl, itr1
-	ANDQ $-16, itr1
+	MOVO  ·chacha20Constants<>+0(SB), X1
+	MOVO  32(BP), X4
+	MOVO  48(BP), X7
+	MOVO  128(BP), X10
+	PADDL ·sseIncMask<>+0(SB), X10
+	MOVO  X10, 80(BP)
+	MOVO  X1, X0
+	MOVO  X4, X3
+	MOVO  X7, X6
+	MOVO  X10, X9
+	PADDL ·sseIncMask<>+0(SB), X9
+	MOVO  X9, 96(BP)
+	XORQ  R9, R9
+	MOVQ  BX, CX
+	ANDQ  $-16, CX
 
 openSSETail128LoopA:
-	// Perform ChaCha rounds, while hashing the remaining input
-	polyAdd(0(inp)(itr2*1))
-	polyMul
+	ADDQ  (SI)(R9*1), R10
+	ADCQ  8(SI)(R9*1), R11
+	ADCQ  $0x01, R12
+	MOVQ  (BP), AX
+	MOVQ  AX, R15
+	MULQ  R10
+	MOVQ  AX, R13
+	MOVQ  DX, R14
+	MOVQ  (BP), AX
+	MULQ  R11
+	IMULQ R12, R15
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), AX
+	MOVQ  AX, R8
+	MULQ  R10
+	ADDQ  AX, R14
+	ADCQ  $0x00, DX
+	MOVQ  DX, R10
+	MOVQ  8(BP), AX
+	MULQ  R11
+	ADDQ  AX, R15
+	ADCQ  $0x00, DX
+	IMULQ R12, R8
+	ADDQ  R10, R15
+	ADCQ  DX, R8
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
 
 openSSETail128LoopB:
-	ADDQ          $16, itr2
-	chachaQR(A0, B0, C0, D0, T0); chachaQR(A1, B1, C1, D1, T0)
-	shiftB0Left;  shiftC0Left; shiftD0Left
-	shiftB1Left;  shiftC1Left; shiftD1Left
-	chachaQR(A0, B0, C0, D0, T0); chachaQR(A1, B1, C1, D1, T0)
-	shiftB0Right; shiftC0Right; shiftD0Right
-	shiftB1Right; shiftC1Right; shiftD1Right
+	ADDQ  $0x10, R9
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL16(X9, X12)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X12
+	PSLLL $0x0c, X12
+	PSRLL $0x14, X3
+	PXOR  X12, X3
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL8(X9, X12)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X12
+	PSLLL $0x07, X12
+	PSRLL $0x19, X3
+	PXOR  X12, X3
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL16(X10, X12)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X12
+	PSLLL $0x0c, X12
+	PSRLL $0x14, X4
+	PXOR  X12, X4
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL8(X10, X12)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X12
+	PSLLL $0x07, X12
+	PSRLL $0x19, X4
+	PXOR  X12, X4
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xdb
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xf6
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xc9
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xe4
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xff
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xd2
+	BYTE  $0x0c
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL16(X9, X12)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X12
+	PSLLL $0x0c, X12
+	PSRLL $0x14, X3
+	PXOR  X12, X3
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL8(X9, X12)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X12
+	PSLLL $0x07, X12
+	PSRLL $0x19, X3
+	PXOR  X12, X3
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL16(X10, X12)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X12
+	PSLLL $0x0c, X12
+	PSRLL $0x14, X4
+	PXOR  X12, X4
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL8(X10, X12)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X12
+	PSLLL $0x07, X12
+	PSRLL $0x19, X4
+	PXOR  X12, X4
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xdb
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xf6
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xc9
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xe4
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xff
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xd2
+	BYTE  $0x04
+	CMPQ  R9, CX
+	JB    openSSETail128LoopA
+	CMPQ  R9, $0xa0
+	JNE   openSSETail128LoopB
+	PADDL ·chacha20Constants<>+0(SB), X0
+	PADDL ·chacha20Constants<>+0(SB), X1
+	PADDL 32(BP), X3
+	PADDL 32(BP), X4
+	PADDL 48(BP), X6
+	PADDL 48(BP), X7
+	PADDL 96(BP), X9
+	PADDL 80(BP), X10
+	MOVOU (SI), X12
+	MOVOU 16(SI), X13
+	MOVOU 32(SI), X14
+	MOVOU 48(SI), X15
+	PXOR  X12, X1
+	PXOR  X13, X4
+	PXOR  X14, X7
+	PXOR  X15, X10
+	MOVOU X1, (DI)
+	MOVOU X4, 16(DI)
+	MOVOU X7, 32(DI)
+	MOVOU X10, 48(DI)
+	SUBQ  $0x40, BX
+	LEAQ  64(SI), SI
+	LEAQ  64(DI), DI
+	JMP   openSSETail64DecLoop
 
-	CMPQ itr2, itr1
-	JB   openSSETail128LoopA
-
-	CMPQ itr2, $160
-	JNE  openSSETail128LoopB
-
-	PADDL ·chacha20Constants<>(SB), A0; PADDL ·chacha20Constants<>(SB), A1
-	PADDL state1Store, B0; PADDL state1Store, B1
-	PADDL state2Store, C0; PADDL state2Store, C1
-	PADDL ctr1Store, D0; PADDL ctr0Store, D1
-
-	MOVOU (0*16)(inp), T0; MOVOU (1*16)(inp), T1; MOVOU (2*16)(inp), T2; MOVOU (3*16)(inp), T3
-	PXOR  T0, A1; PXOR T1, B1; PXOR T2, C1; PXOR T3, D1
-	MOVOU A1, (0*16)(oup); MOVOU B1, (1*16)(oup); MOVOU C1, (2*16)(oup); MOVOU D1, (3*16)(oup)
-
-	SUBQ $64, inl
-	LEAQ 64(inp), inp
-	LEAQ 64(oup), oup
-	JMP  openSSETail64DecLoop
-
-// ----------------------------------------------------------------------------
-// Special optimization for the last 192 bytes of ciphertext
 openSSETail192:
-	// Need to decrypt up to 192 bytes - prepare three blocks
-	MOVO ·chacha20Constants<>(SB), A2; MOVO state1Store, B2; MOVO state2Store, C2; MOVO ctr3Store, D2; PADDL ·sseIncMask<>(SB), D2; MOVO D2, ctr0Store
-	MOVO A2, A1; MOVO B2, B1; MOVO C2, C1; MOVO D2, D1; PADDL ·sseIncMask<>(SB), D1; MOVO D1, ctr1Store
-	MOVO A1, A0; MOVO B1, B0; MOVO C1, C0; MOVO D1, D0; PADDL ·sseIncMask<>(SB), D0; MOVO D0, ctr2Store
-
-	MOVQ    inl, itr1
-	MOVQ    $160, itr2
-	CMPQ    itr1, $160
-	CMOVQGT itr2, itr1
-	ANDQ    $-16, itr1
-	XORQ    itr2, itr2
+	MOVO    ·chacha20Constants<>+0(SB), X2
+	MOVO    32(BP), X5
+	MOVO    48(BP), X8
+	MOVO    128(BP), X11
+	PADDL   ·sseIncMask<>+0(SB), X11
+	MOVO    X11, 80(BP)
+	MOVO    X2, X1
+	MOVO    X5, X4
+	MOVO    X8, X7
+	MOVO    X11, X10
+	PADDL   ·sseIncMask<>+0(SB), X10
+	MOVO    X10, 96(BP)
+	MOVO    X1, X0
+	MOVO    X4, X3
+	MOVO    X7, X6
+	MOVO    X10, X9
+	PADDL   ·sseIncMask<>+0(SB), X9
+	MOVO    X9, 112(BP)
+	MOVQ    BX, CX
+	MOVQ    $0x000000a0, R9
+	CMPQ    CX, $0xa0
+	CMOVQGT R9, CX
+	ANDQ    $-16, CX
+	XORQ    R9, R9
 
 openSSLTail192LoopA:
-	// Perform ChaCha rounds, while hashing the remaining input
-	polyAdd(0(inp)(itr2*1))
-	polyMul
+	ADDQ  (SI)(R9*1), R10
+	ADCQ  8(SI)(R9*1), R11
+	ADCQ  $0x01, R12
+	MOVQ  (BP), AX
+	MOVQ  AX, R15
+	MULQ  R10
+	MOVQ  AX, R13
+	MOVQ  DX, R14
+	MOVQ  (BP), AX
+	MULQ  R11
+	IMULQ R12, R15
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), AX
+	MOVQ  AX, R8
+	MULQ  R10
+	ADDQ  AX, R14
+	ADCQ  $0x00, DX
+	MOVQ  DX, R10
+	MOVQ  8(BP), AX
+	MULQ  R11
+	ADDQ  AX, R15
+	ADCQ  $0x00, DX
+	IMULQ R12, R8
+	ADDQ  R10, R15
+	ADCQ  DX, R8
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
 
 openSSLTail192LoopB:
-	ADDQ         $16, itr2
-	chachaQR(A0, B0, C0, D0, T0); chachaQR(A1, B1, C1, D1, T0); chachaQR(A2, B2, C2, D2, T0)
-	shiftB0Left; shiftC0Left; shiftD0Left
-	shiftB1Left; shiftC1Left; shiftD1Left
-	shiftB2Left; shiftC2Left; shiftD2Left
-
-	chachaQR(A0, B0, C0, D0, T0); chachaQR(A1, B1, C1, D1, T0); chachaQR(A2, B2, C2, D2, T0)
-	shiftB0Right; shiftC0Right; shiftD0Right
-	shiftB1Right; shiftC1Right; shiftD1Right
-	shiftB2Right; shiftC2Right; shiftD2Right
-
-	CMPQ itr2, itr1
-	JB   openSSLTail192LoopA
-
-	CMPQ itr2, $160
-	JNE  openSSLTail192LoopB
-
-	CMPQ inl, $176
-	JB   openSSLTail192Store
-
-	polyAdd(160(inp))
-	polyMul
-
-	CMPQ inl, $192
-	JB   openSSLTail192Store
-
-	polyAdd(176(inp))
-	polyMul
+	ADDQ  $0x10, R9
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL16(X9, X12)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X12
+	PSLLL $0x0c, X12
+	PSRLL $0x14, X3
+	PXOR  X12, X3
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL8(X9, X12)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X12
+	PSLLL $0x07, X12
+	PSRLL $0x19, X3
+	PXOR  X12, X3
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL16(X10, X12)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X12
+	PSLLL $0x0c, X12
+	PSRLL $0x14, X4
+	PXOR  X12, X4
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL8(X10, X12)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X12
+	PSLLL $0x07, X12
+	PSRLL $0x19, X4
+	PXOR  X12, X4
+	PADDD X5, X2
+	PXOR  X2, X11
+	ROL16(X11, X12)
+	PADDD X11, X8
+	PXOR  X8, X5
+	MOVO  X5, X12
+	PSLLL $0x0c, X12
+	PSRLL $0x14, X5
+	PXOR  X12, X5
+	PADDD X5, X2
+	PXOR  X2, X11
+	ROL8(X11, X12)
+	PADDD X11, X8
+	PXOR  X8, X5
+	MOVO  X5, X12
+	PSLLL $0x07, X12
+	PSRLL $0x19, X5
+	PXOR  X12, X5
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xdb
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xf6
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xc9
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xe4
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xff
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xd2
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xed
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xc0
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xdb
+	BYTE  $0x0c
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL16(X9, X12)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X12
+	PSLLL $0x0c, X12
+	PSRLL $0x14, X3
+	PXOR  X12, X3
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL8(X9, X12)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X12
+	PSLLL $0x07, X12
+	PSRLL $0x19, X3
+	PXOR  X12, X3
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL16(X10, X12)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X12
+	PSLLL $0x0c, X12
+	PSRLL $0x14, X4
+	PXOR  X12, X4
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL8(X10, X12)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X12
+	PSLLL $0x07, X12
+	PSRLL $0x19, X4
+	PXOR  X12, X4
+	PADDD X5, X2
+	PXOR  X2, X11
+	ROL16(X11, X12)
+	PADDD X11, X8
+	PXOR  X8, X5
+	MOVO  X5, X12
+	PSLLL $0x0c, X12
+	PSRLL $0x14, X5
+	PXOR  X12, X5
+	PADDD X5, X2
+	PXOR  X2, X11
+	ROL8(X11, X12)
+	PADDD X11, X8
+	PXOR  X8, X5
+	MOVO  X5, X12
+	PSLLL $0x07, X12
+	PSRLL $0x19, X5
+	PXOR  X12, X5
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xdb
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xf6
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xc9
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xe4
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xff
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xd2
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xed
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xc0
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xdb
+	BYTE  $0x04
+	CMPQ  R9, CX
+	JB    openSSLTail192LoopA
+	CMPQ  R9, $0xa0
+	JNE   openSSLTail192LoopB
+	CMPQ  BX, $0xb0
+	JB    openSSLTail192Store
+	ADDQ  160(SI), R10
+	ADCQ  168(SI), R11
+	ADCQ  $0x01, R12
+	MOVQ  (BP), AX
+	MOVQ  AX, R15
+	MULQ  R10
+	MOVQ  AX, R13
+	MOVQ  DX, R14
+	MOVQ  (BP), AX
+	MULQ  R11
+	IMULQ R12, R15
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), AX
+	MOVQ  AX, R8
+	MULQ  R10
+	ADDQ  AX, R14
+	ADCQ  $0x00, DX
+	MOVQ  DX, R10
+	MOVQ  8(BP), AX
+	MULQ  R11
+	ADDQ  AX, R15
+	ADCQ  $0x00, DX
+	IMULQ R12, R8
+	ADDQ  R10, R15
+	ADCQ  DX, R8
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
+	CMPQ  BX, $0xc0
+	JB    openSSLTail192Store
+	ADDQ  176(SI), R10
+	ADCQ  184(SI), R11
+	ADCQ  $0x01, R12
+	MOVQ  (BP), AX
+	MOVQ  AX, R15
+	MULQ  R10
+	MOVQ  AX, R13
+	MOVQ  DX, R14
+	MOVQ  (BP), AX
+	MULQ  R11
+	IMULQ R12, R15
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), AX
+	MOVQ  AX, R8
+	MULQ  R10
+	ADDQ  AX, R14
+	ADCQ  $0x00, DX
+	MOVQ  DX, R10
+	MOVQ  8(BP), AX
+	MULQ  R11
+	ADDQ  AX, R15
+	ADCQ  $0x00, DX
+	IMULQ R12, R8
+	ADDQ  R10, R15
+	ADCQ  DX, R8
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
 
 openSSLTail192Store:
-	PADDL ·chacha20Constants<>(SB), A0; PADDL ·chacha20Constants<>(SB), A1; PADDL ·chacha20Constants<>(SB), A2
-	PADDL state1Store, B0; PADDL state1Store, B1; PADDL state1Store, B2
-	PADDL state2Store, C0; PADDL state2Store, C1; PADDL state2Store, C2
-	PADDL ctr2Store, D0; PADDL ctr1Store, D1; PADDL ctr0Store, D2
+	PADDL ·chacha20Constants<>+0(SB), X0
+	PADDL ·chacha20Constants<>+0(SB), X1
+	PADDL ·chacha20Constants<>+0(SB), X2
+	PADDL 32(BP), X3
+	PADDL 32(BP), X4
+	PADDL 32(BP), X5
+	PADDL 48(BP), X6
+	PADDL 48(BP), X7
+	PADDL 48(BP), X8
+	PADDL 112(BP), X9
+	PADDL 96(BP), X10
+	PADDL 80(BP), X11
+	MOVOU (SI), X12
+	MOVOU 16(SI), X13
+	MOVOU 32(SI), X14
+	MOVOU 48(SI), X15
+	PXOR  X12, X2
+	PXOR  X13, X5
+	PXOR  X14, X8
+	PXOR  X15, X11
+	MOVOU X2, (DI)
+	MOVOU X5, 16(DI)
+	MOVOU X8, 32(DI)
+	MOVOU X11, 48(DI)
+	MOVOU 64(SI), X12
+	MOVOU 80(SI), X13
+	MOVOU 96(SI), X14
+	MOVOU 112(SI), X15
+	PXOR  X12, X1
+	PXOR  X13, X4
+	PXOR  X14, X7
+	PXOR  X15, X10
+	MOVOU X1, 64(DI)
+	MOVOU X4, 80(DI)
+	MOVOU X7, 96(DI)
+	MOVOU X10, 112(DI)
+	SUBQ  $0x80, BX
+	LEAQ  128(SI), SI
+	LEAQ  128(DI), DI
+	JMP   openSSETail64DecLoop
 
-	MOVOU (0*16)(inp), T0; MOVOU (1*16)(inp), T1; MOVOU (2*16)(inp), T2; MOVOU (3*16)(inp), T3
-	PXOR  T0, A2; PXOR T1, B2; PXOR T2, C2; PXOR T3, D2
-	MOVOU A2, (0*16)(oup); MOVOU B2, (1*16)(oup); MOVOU C2, (2*16)(oup); MOVOU D2, (3*16)(oup)
-
-	MOVOU (4*16)(inp), T0; MOVOU (5*16)(inp), T1; MOVOU (6*16)(inp), T2; MOVOU (7*16)(inp), T3
-	PXOR  T0, A1; PXOR T1, B1; PXOR T2, C1; PXOR T3, D1
-	MOVOU A1, (4*16)(oup); MOVOU B1, (5*16)(oup); MOVOU C1, (6*16)(oup); MOVOU D1, (7*16)(oup)
-
-	SUBQ $128, inl
-	LEAQ 128(inp), inp
-	LEAQ 128(oup), oup
-	JMP  openSSETail64DecLoop
-
-// ----------------------------------------------------------------------------
-// Special optimization for the last 256 bytes of ciphertext
 openSSETail256:
-	// Need to decrypt up to 256 bytes - prepare four blocks
-	MOVO ·chacha20Constants<>(SB), A0; MOVO state1Store, B0; MOVO state2Store, C0; MOVO ctr3Store, D0; PADDL ·sseIncMask<>(SB), D0
-	MOVO A0, A1; MOVO B0, B1; MOVO C0, C1; MOVO D0, D1; PADDL ·sseIncMask<>(SB), D1
-	MOVO A1, A2; MOVO B1, B2; MOVO C1, C2; MOVO D1, D2; PADDL ·sseIncMask<>(SB), D2
-	MOVO A2, A3; MOVO B2, B3; MOVO C2, C3; MOVO D2, D3; PADDL ·sseIncMask<>(SB), D3
+	MOVO  ·chacha20Constants<>+0(SB), X0
+	MOVO  32(BP), X3
+	MOVO  48(BP), X6
+	MOVO  128(BP), X9
+	PADDL ·sseIncMask<>+0(SB), X9
+	MOVO  X0, X1
+	MOVO  X3, X4
+	MOVO  X6, X7
+	MOVO  X9, X10
+	PADDL ·sseIncMask<>+0(SB), X10
+	MOVO  X1, X2
+	MOVO  X4, X5
+	MOVO  X7, X8
+	MOVO  X10, X11
+	PADDL ·sseIncMask<>+0(SB), X11
+	MOVO  X2, X12
+	MOVO  X5, X13
+	MOVO  X8, X14
+	MOVO  X11, X15
+	PADDL ·sseIncMask<>+0(SB), X15
 
 	// Store counters
-	MOVO D0, ctr0Store; MOVO D1, ctr1Store; MOVO D2, ctr2Store; MOVO D3, ctr3Store
-	XORQ itr2, itr2
+	MOVO X9, 80(BP)
+	MOVO X10, 96(BP)
+	MOVO X11, 112(BP)
+	MOVO X15, 128(BP)
+	XORQ R9, R9
 
 openSSETail256Loop:
-	// This loop inteleaves 8 ChaCha quarter rounds with 1 poly multiplication
-	polyAdd(0(inp)(itr2*1))
-	MOVO          C3, tmpStore
-	chachaQR(A0, B0, C0, D0, C3); chachaQR(A1, B1, C1, D1, C3); chachaQR(A2, B2, C2, D2, C3)
-	MOVO          tmpStore, C3
-	MOVO          C1, tmpStore
-	chachaQR(A3, B3, C3, D3, C1)
-	MOVO          tmpStore, C1
-	shiftB0Left;  shiftB1Left; shiftB2Left; shiftB3Left
-	shiftC0Left;  shiftC1Left; shiftC2Left; shiftC3Left
-	shiftD0Left;  shiftD1Left; shiftD2Left; shiftD3Left
-	polyMulStage1
-	polyMulStage2
-	MOVO          C3, tmpStore
-	chachaQR(A0, B0, C0, D0, C3); chachaQR(A1, B1, C1, D1, C3); chachaQR(A2, B2, C2, D2, C3)
-	MOVO          tmpStore, C3
-	MOVO          C1, tmpStore
-	chachaQR(A3, B3, C3, D3, C1)
-	MOVO          tmpStore, C1
-	polyMulStage3
-	polyMulReduceStage
-	shiftB0Right; shiftB1Right; shiftB2Right; shiftB3Right
-	shiftC0Right; shiftC1Right; shiftC2Right; shiftC3Right
-	shiftD0Right; shiftD1Right; shiftD2Right; shiftD3Right
-	ADDQ          $2*8, itr2
-	CMPQ          itr2, $160
-	JB            openSSETail256Loop
-	MOVQ          inl, itr1
-	ANDQ          $-16, itr1
+	ADDQ  (SI)(R9*1), R10
+	ADCQ  8(SI)(R9*1), R11
+	ADCQ  $0x01, R12
+	MOVO  X14, 64(BP)
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL16(X9, X14)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X14
+	PSLLL $0x0c, X14
+	PSRLL $0x14, X3
+	PXOR  X14, X3
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL8(X9, X14)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X14
+	PSLLL $0x07, X14
+	PSRLL $0x19, X3
+	PXOR  X14, X3
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL16(X10, X14)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X14
+	PSLLL $0x0c, X14
+	PSRLL $0x14, X4
+	PXOR  X14, X4
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL8(X10, X14)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X14
+	PSLLL $0x07, X14
+	PSRLL $0x19, X4
+	PXOR  X14, X4
+	PADDD X5, X2
+	PXOR  X2, X11
+	ROL16(X11, X14)
+	PADDD X11, X8
+	PXOR  X8, X5
+	MOVO  X5, X14
+	PSLLL $0x0c, X14
+	PSRLL $0x14, X5
+	PXOR  X14, X5
+	PADDD X5, X2
+	PXOR  X2, X11
+	ROL8(X11, X14)
+	PADDD X11, X8
+	PXOR  X8, X5
+	MOVO  X5, X14
+	PSLLL $0x07, X14
+	PSRLL $0x19, X5
+	PXOR  X14, X5
+	MOVO  64(BP), X14
+	MOVO  X7, 64(BP)
+	PADDD X13, X12
+	PXOR  X12, X15
+	ROL16(X15, X7)
+	PADDD X15, X14
+	PXOR  X14, X13
+	MOVO  X13, X7
+	PSLLL $0x0c, X7
+	PSRLL $0x14, X13
+	PXOR  X7, X13
+	PADDD X13, X12
+	PXOR  X12, X15
+	ROL8(X15, X7)
+	PADDD X15, X14
+	PXOR  X14, X13
+	MOVO  X13, X7
+	PSLLL $0x07, X7
+	PSRLL $0x19, X13
+	PXOR  X7, X13
+	MOVO  64(BP), X7
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xdb
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xe4
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xed
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xed
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xf6
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xff
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xc0
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xf6
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xc9
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xd2
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xdb
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xff
+	BYTE  $0x0c
+	MOVQ  (BP), AX
+	MOVQ  AX, R15
+	MULQ  R10
+	MOVQ  AX, R13
+	MOVQ  DX, R14
+	MOVQ  (BP), AX
+	MULQ  R11
+	IMULQ R12, R15
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), AX
+	MOVQ  AX, R8
+	MULQ  R10
+	ADDQ  AX, R14
+	ADCQ  $0x00, DX
+	MOVQ  DX, R10
+	MOVQ  8(BP), AX
+	MULQ  R11
+	ADDQ  AX, R15
+	ADCQ  $0x00, DX
+	MOVO  X14, 64(BP)
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL16(X9, X14)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X14
+	PSLLL $0x0c, X14
+	PSRLL $0x14, X3
+	PXOR  X14, X3
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL8(X9, X14)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X14
+	PSLLL $0x07, X14
+	PSRLL $0x19, X3
+	PXOR  X14, X3
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL16(X10, X14)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X14
+	PSLLL $0x0c, X14
+	PSRLL $0x14, X4
+	PXOR  X14, X4
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL8(X10, X14)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X14
+	PSLLL $0x07, X14
+	PSRLL $0x19, X4
+	PXOR  X14, X4
+	PADDD X5, X2
+	PXOR  X2, X11
+	ROL16(X11, X14)
+	PADDD X11, X8
+	PXOR  X8, X5
+	MOVO  X5, X14
+	PSLLL $0x0c, X14
+	PSRLL $0x14, X5
+	PXOR  X14, X5
+	PADDD X5, X2
+	PXOR  X2, X11
+	ROL8(X11, X14)
+	PADDD X11, X8
+	PXOR  X8, X5
+	MOVO  X5, X14
+	PSLLL $0x07, X14
+	PSRLL $0x19, X5
+	PXOR  X14, X5
+	MOVO  64(BP), X14
+	MOVO  X7, 64(BP)
+	PADDD X13, X12
+	PXOR  X12, X15
+	ROL16(X15, X7)
+	PADDD X15, X14
+	PXOR  X14, X13
+	MOVO  X13, X7
+	PSLLL $0x0c, X7
+	PSRLL $0x14, X13
+	PXOR  X7, X13
+	PADDD X13, X12
+	PXOR  X12, X15
+	ROL8(X15, X7)
+	PADDD X15, X14
+	PXOR  X14, X13
+	MOVO  X13, X7
+	PSLLL $0x07, X7
+	PSRLL $0x19, X13
+	PXOR  X7, X13
+	MOVO  64(BP), X7
+	IMULQ R12, R8
+	ADDQ  R10, R15
+	ADCQ  DX, R8
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xdb
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xe4
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xed
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xed
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xf6
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xff
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xc0
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xf6
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xc9
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xd2
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xdb
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xff
+	BYTE  $0x04
+	ADDQ  $0x10, R9
+	CMPQ  R9, $0xa0
+	JB    openSSETail256Loop
+	MOVQ  BX, CX
+	ANDQ  $-16, CX
 
 openSSETail256HashLoop:
-	polyAdd(0(inp)(itr2*1))
-	polyMul
-	ADDQ $2*8, itr2
-	CMPQ itr2, itr1
-	JB   openSSETail256HashLoop
+	ADDQ  (SI)(R9*1), R10
+	ADCQ  8(SI)(R9*1), R11
+	ADCQ  $0x01, R12
+	MOVQ  (BP), AX
+	MOVQ  AX, R15
+	MULQ  R10
+	MOVQ  AX, R13
+	MOVQ  DX, R14
+	MOVQ  (BP), AX
+	MULQ  R11
+	IMULQ R12, R15
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), AX
+	MOVQ  AX, R8
+	MULQ  R10
+	ADDQ  AX, R14
+	ADCQ  $0x00, DX
+	MOVQ  DX, R10
+	MOVQ  8(BP), AX
+	MULQ  R11
+	ADDQ  AX, R15
+	ADCQ  $0x00, DX
+	IMULQ R12, R8
+	ADDQ  R10, R15
+	ADCQ  DX, R8
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
+	ADDQ  $0x10, R9
+	CMPQ  R9, CX
+	JB    openSSETail256HashLoop
 
 	// Add in the state
-	PADDD ·chacha20Constants<>(SB), A0; PADDD ·chacha20Constants<>(SB), A1; PADDD ·chacha20Constants<>(SB), A2; PADDD ·chacha20Constants<>(SB), A3
-	PADDD state1Store, B0; PADDD state1Store, B1; PADDD state1Store, B2; PADDD state1Store, B3
-	PADDD state2Store, C0; PADDD state2Store, C1; PADDD state2Store, C2; PADDD state2Store, C3
-	PADDD ctr0Store, D0; PADDD ctr1Store, D1; PADDD ctr2Store, D2; PADDD ctr3Store, D3
-	MOVO  D3, tmpStore
+	PADDD ·chacha20Constants<>+0(SB), X0
+	PADDD ·chacha20Constants<>+0(SB), X1
+	PADDD ·chacha20Constants<>+0(SB), X2
+	PADDD ·chacha20Constants<>+0(SB), X12
+	PADDD 32(BP), X3
+	PADDD 32(BP), X4
+	PADDD 32(BP), X5
+	PADDD 32(BP), X13
+	PADDD 48(BP), X6
+	PADDD 48(BP), X7
+	PADDD 48(BP), X8
+	PADDD 48(BP), X14
+	PADDD 80(BP), X9
+	PADDD 96(BP), X10
+	PADDD 112(BP), X11
+	PADDD 128(BP), X15
+	MOVO  X15, 64(BP)
 
 	// Load - xor - store
-	MOVOU (0*16)(inp), D3; PXOR D3, A0
-	MOVOU (1*16)(inp), D3; PXOR D3, B0
-	MOVOU (2*16)(inp), D3; PXOR D3, C0
-	MOVOU (3*16)(inp), D3; PXOR D3, D0
-	MOVOU A0, (0*16)(oup)
-	MOVOU B0, (1*16)(oup)
-	MOVOU C0, (2*16)(oup)
-	MOVOU D0, (3*16)(oup)
-	MOVOU (4*16)(inp), A0; MOVOU (5*16)(inp), B0; MOVOU (6*16)(inp), C0; MOVOU (7*16)(inp), D0
-	PXOR  A0, A1; PXOR B0, B1; PXOR C0, C1; PXOR D0, D1
-	MOVOU A1, (4*16)(oup); MOVOU B1, (5*16)(oup); MOVOU C1, (6*16)(oup); MOVOU D1, (7*16)(oup)
-	MOVOU (8*16)(inp), A0; MOVOU (9*16)(inp), B0; MOVOU (10*16)(inp), C0; MOVOU (11*16)(inp), D0
-	PXOR  A0, A2; PXOR B0, B2; PXOR C0, C2; PXOR D0, D2
-	MOVOU A2, (8*16)(oup); MOVOU B2, (9*16)(oup); MOVOU C2, (10*16)(oup); MOVOU D2, (11*16)(oup)
-	LEAQ  192(inp), inp
-	LEAQ  192(oup), oup
-	SUBQ  $192, inl
-	MOVO  A3, A0
-	MOVO  B3, B0
-	MOVO  C3, C0
-	MOVO  tmpStore, D0
+	MOVOU (SI), X15
+	PXOR  X15, X0
+	MOVOU 16(SI), X15
+	PXOR  X15, X3
+	MOVOU 32(SI), X15
+	PXOR  X15, X6
+	MOVOU 48(SI), X15
+	PXOR  X15, X9
+	MOVOU X0, (DI)
+	MOVOU X3, 16(DI)
+	MOVOU X6, 32(DI)
+	MOVOU X9, 48(DI)
+	MOVOU 64(SI), X0
+	MOVOU 80(SI), X3
+	MOVOU 96(SI), X6
+	MOVOU 112(SI), X9
+	PXOR  X0, X1
+	PXOR  X3, X4
+	PXOR  X6, X7
+	PXOR  X9, X10
+	MOVOU X1, 64(DI)
+	MOVOU X4, 80(DI)
+	MOVOU X7, 96(DI)
+	MOVOU X10, 112(DI)
+	MOVOU 128(SI), X0
+	MOVOU 144(SI), X3
+	MOVOU 160(SI), X6
+	MOVOU 176(SI), X9
+	PXOR  X0, X2
+	PXOR  X3, X5
+	PXOR  X6, X8
+	PXOR  X9, X11
+	MOVOU X2, 128(DI)
+	MOVOU X5, 144(DI)
+	MOVOU X8, 160(DI)
+	MOVOU X11, 176(DI)
+	LEAQ  192(SI), SI
+	LEAQ  192(DI), DI
+	SUBQ  $0xc0, BX
+	MOVO  X12, X0
+	MOVO  X13, X3
+	MOVO  X14, X6
+	MOVO  64(BP), X9
+	JMP   openSSETail64DecLoop
 
-	JMP openSSETail64DecLoop
-
-// ----------------------------------------------------------------------------
-// ------------------------- AVX2 Code ----------------------------------------
 chacha20Poly1305Open_AVX2:
 	VZEROUPPER
-	VMOVDQU ·chacha20Constants<>(SB), AA0
-	BYTE    $0xc4; BYTE $0x42; BYTE $0x7d; BYTE $0x5a; BYTE $0x70; BYTE $0x10 // broadcasti128 16(r8), ymm14
-	BYTE    $0xc4; BYTE $0x42; BYTE $0x7d; BYTE $0x5a; BYTE $0x60; BYTE $0x20 // broadcasti128 32(r8), ymm12
-	BYTE    $0xc4; BYTE $0xc2; BYTE $0x7d; BYTE $0x5a; BYTE $0x60; BYTE $0x30 // broadcasti128 48(r8), ymm4
-	VPADDD  ·avx2InitMask<>(SB), DD0, DD0
+	VMOVDQU ·chacha20Constants<>+0(SB), Y0
+	BYTE    $0xc4
+	BYTE    $0x42
+	BYTE    $0x7d
+	BYTE    $0x5a
+	BYTE    $0x70
+	BYTE    $0x10
+	BYTE    $0xc4
+	BYTE    $0x42
+	BYTE    $0x7d
+	BYTE    $0x5a
+	BYTE    $0x60
+	BYTE    $0x20
+	BYTE    $0xc4
+	BYTE    $0xc2
+	BYTE    $0x7d
+	BYTE    $0x5a
+	BYTE    $0x60
+	BYTE    $0x30
+	VPADDD  ·avx2InitMask<>+0(SB), Y4, Y4
 
 	// Special optimization, for very short buffers
-	CMPQ inl, $192
+	CMPQ BX, $0xc0
 	JBE  openAVX2192
-	CMPQ inl, $320
+	CMPQ BX, $0x00000140
 	JBE  openAVX2320
 
 	// For the general key prepare the key first - as a byproduct we have 64 bytes of cipher stream
-	VMOVDQA BB0, state1StoreAVX2
-	VMOVDQA CC0, state2StoreAVX2
-	VMOVDQA DD0, ctr3StoreAVX2
-	MOVQ    $10, itr2
+	VMOVDQA Y14, 32(BP)
+	VMOVDQA Y12, 64(BP)
+	VMOVDQA Y4, 192(BP)
+	MOVQ    $0x0000000a, R9
 
 openAVX2PreparePolyKey:
-	chachaQR_AVX2(AA0, BB0, CC0, DD0, TT0)
-	VPALIGNR $4, BB0, BB0, BB0; VPALIGNR $8, CC0, CC0, CC0; VPALIGNR $12, DD0, DD0, DD0
-	chachaQR_AVX2(AA0, BB0, CC0, DD0, TT0)
-	VPALIGNR $12, BB0, BB0, BB0; VPALIGNR $8, CC0, CC0, CC0; VPALIGNR $4, DD0, DD0, DD0
-	DECQ     itr2
-	JNE      openAVX2PreparePolyKey
-
-	VPADDD ·chacha20Constants<>(SB), AA0, AA0
-	VPADDD state1StoreAVX2, BB0, BB0
-	VPADDD state2StoreAVX2, CC0, CC0
-	VPADDD ctr3StoreAVX2, DD0, DD0
-
-	VPERM2I128 $0x02, AA0, BB0, TT0
+	VPADDD     Y14, Y0, Y0
+	VPXOR      Y0, Y4, Y4
+	VPSHUFB    ·rol16<>+0(SB), Y4, Y4
+	VPADDD     Y4, Y12, Y12
+	VPXOR      Y12, Y14, Y14
+	VPSLLD     $0x0c, Y14, Y3
+	VPSRLD     $0x14, Y14, Y14
+	VPXOR      Y3, Y14, Y14
+	VPADDD     Y14, Y0, Y0
+	VPXOR      Y0, Y4, Y4
+	VPSHUFB    ·rol8<>+0(SB), Y4, Y4
+	VPADDD     Y4, Y12, Y12
+	VPXOR      Y12, Y14, Y14
+	VPSLLD     $0x07, Y14, Y3
+	VPSRLD     $0x19, Y14, Y14
+	VPXOR      Y3, Y14, Y14
+	VPALIGNR   $0x04, Y14, Y14, Y14
+	VPALIGNR   $0x08, Y12, Y12, Y12
+	VPALIGNR   $0x0c, Y4, Y4, Y4
+	VPADDD     Y14, Y0, Y0
+	VPXOR      Y0, Y4, Y4
+	VPSHUFB    ·rol16<>+0(SB), Y4, Y4
+	VPADDD     Y4, Y12, Y12
+	VPXOR      Y12, Y14, Y14
+	VPSLLD     $0x0c, Y14, Y3
+	VPSRLD     $0x14, Y14, Y14
+	VPXOR      Y3, Y14, Y14
+	VPADDD     Y14, Y0, Y0
+	VPXOR      Y0, Y4, Y4
+	VPSHUFB    ·rol8<>+0(SB), Y4, Y4
+	VPADDD     Y4, Y12, Y12
+	VPXOR      Y12, Y14, Y14
+	VPSLLD     $0x07, Y14, Y3
+	VPSRLD     $0x19, Y14, Y14
+	VPXOR      Y3, Y14, Y14
+	VPALIGNR   $0x0c, Y14, Y14, Y14
+	VPALIGNR   $0x08, Y12, Y12, Y12
+	VPALIGNR   $0x04, Y4, Y4, Y4
+	DECQ       R9
+	JNE        openAVX2PreparePolyKey
+	VPADDD     ·chacha20Constants<>+0(SB), Y0, Y0
+	VPADDD     32(BP), Y14, Y14
+	VPADDD     64(BP), Y12, Y12
+	VPADDD     192(BP), Y4, Y4
+	VPERM2I128 $0x02, Y0, Y14, Y3
 
 	// Clamp and store poly key
-	VPAND   ·polyClampMask<>(SB), TT0, TT0
-	VMOVDQA TT0, rsStoreAVX2
+	VPAND   ·polyClampMask<>+0(SB), Y3, Y3
+	VMOVDQA Y3, (BP)
 
 	// Stream for the first 64 bytes
-	VPERM2I128 $0x13, AA0, BB0, AA0
-	VPERM2I128 $0x13, CC0, DD0, BB0
+	VPERM2I128 $0x13, Y0, Y14, Y0
+	VPERM2I128 $0x13, Y12, Y4, Y14
 
 	// Hash AD + first 64 bytes
-	MOVQ ad_len+80(FP), itr2
+	MOVQ ad_len+80(FP), R9
 	CALL polyHashADInternal<>(SB)
-	XORQ itr1, itr1
+	XORQ CX, CX
 
 openAVX2InitialHash64:
-	polyAdd(0(inp)(itr1*1))
-	polyMulAVX2
-	ADDQ $16, itr1
-	CMPQ itr1, $64
-	JNE  openAVX2InitialHash64
+	ADDQ  (SI)(CX*1), R10
+	ADCQ  8(SI)(CX*1), R11
+	ADCQ  $0x01, R12
+	MOVQ  (BP), DX
+	MOVQ  DX, R15
+	MULXQ R10, R13, R14
+	IMULQ R12, R15
+	MULXQ R11, AX, DX
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), DX
+	MULXQ R10, R10, AX
+	ADDQ  R10, R14
+	MULXQ R11, R11, R8
+	ADCQ  R11, R15
+	ADCQ  $0x00, R8
+	IMULQ R12, DX
+	ADDQ  AX, R15
+	ADCQ  DX, R8
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
+	ADDQ  $0x10, CX
+	CMPQ  CX, $0x40
+	JNE   openAVX2InitialHash64
 
 	// Decrypt the first 64 bytes
-	VPXOR   (0*32)(inp), AA0, AA0
-	VPXOR   (1*32)(inp), BB0, BB0
-	VMOVDQU AA0, (0*32)(oup)
-	VMOVDQU BB0, (1*32)(oup)
-	LEAQ    (2*32)(inp), inp
-	LEAQ    (2*32)(oup), oup
-	SUBQ    $64, inl
+	VPXOR   (SI), Y0, Y0
+	VPXOR   32(SI), Y14, Y14
+	VMOVDQU Y0, (DI)
+	VMOVDQU Y14, 32(DI)
+	LEAQ    64(SI), SI
+	LEAQ    64(DI), DI
+	SUBQ    $0x40, BX
 
 openAVX2MainLoop:
-	CMPQ inl, $512
+	CMPQ BX, $0x00000200
 	JB   openAVX2MainLoopDone
 
 	// Load state, increment counter blocks, store the incremented counters
-	VMOVDQU ·chacha20Constants<>(SB), AA0; VMOVDQA AA0, AA1; VMOVDQA AA0, AA2; VMOVDQA AA0, AA3
-	VMOVDQA state1StoreAVX2, BB0; VMOVDQA BB0, BB1; VMOVDQA BB0, BB2; VMOVDQA BB0, BB3
-	VMOVDQA state2StoreAVX2, CC0; VMOVDQA CC0, CC1; VMOVDQA CC0, CC2; VMOVDQA CC0, CC3
-	VMOVDQA ctr3StoreAVX2, DD0; VPADDD ·avx2IncMask<>(SB), DD0, DD0; VPADDD ·avx2IncMask<>(SB), DD0, DD1; VPADDD ·avx2IncMask<>(SB), DD1, DD2; VPADDD ·avx2IncMask<>(SB), DD2, DD3
-	VMOVDQA DD0, ctr0StoreAVX2; VMOVDQA DD1, ctr1StoreAVX2; VMOVDQA DD2, ctr2StoreAVX2; VMOVDQA DD3, ctr3StoreAVX2
-	XORQ    itr1, itr1
+	VMOVDQU ·chacha20Constants<>+0(SB), Y0
+	VMOVDQA Y0, Y5
+	VMOVDQA Y0, Y6
+	VMOVDQA Y0, Y7
+	VMOVDQA 32(BP), Y14
+	VMOVDQA Y14, Y9
+	VMOVDQA Y14, Y10
+	VMOVDQA Y14, Y11
+	VMOVDQA 64(BP), Y12
+	VMOVDQA Y12, Y13
+	VMOVDQA Y12, Y8
+	VMOVDQA Y12, Y15
+	VMOVDQA 192(BP), Y4
+	VPADDD  ·avx2IncMask<>+0(SB), Y4, Y4
+	VPADDD  ·avx2IncMask<>+0(SB), Y4, Y1
+	VPADDD  ·avx2IncMask<>+0(SB), Y1, Y2
+	VPADDD  ·avx2IncMask<>+0(SB), Y2, Y3
+	VMOVDQA Y4, 96(BP)
+	VMOVDQA Y1, 128(BP)
+	VMOVDQA Y2, 160(BP)
+	VMOVDQA Y3, 192(BP)
+	XORQ    CX, CX
 
 openAVX2InternalLoop:
-	// Lets just say this spaghetti loop interleaves 2 quarter rounds with 3 poly multiplications
-	// Effectively per 512 bytes of stream we hash 480 bytes of ciphertext
-	polyAdd(0*8(inp)(itr1*1))
-	VPADDD   BB0, AA0, AA0; VPADDD BB1, AA1, AA1; VPADDD BB2, AA2, AA2; VPADDD BB3, AA3, AA3
-	polyMulStage1_AVX2
-	VPXOR    AA0, DD0, DD0; VPXOR AA1, DD1, DD1; VPXOR AA2, DD2, DD2; VPXOR AA3, DD3, DD3
-	VPSHUFB  ·rol16<>(SB), DD0, DD0; VPSHUFB ·rol16<>(SB), DD1, DD1; VPSHUFB ·rol16<>(SB), DD2, DD2; VPSHUFB ·rol16<>(SB), DD3, DD3
-	polyMulStage2_AVX2
-	VPADDD   DD0, CC0, CC0; VPADDD DD1, CC1, CC1; VPADDD DD2, CC2, CC2; VPADDD DD3, CC3, CC3
-	VPXOR    CC0, BB0, BB0; VPXOR CC1, BB1, BB1; VPXOR CC2, BB2, BB2; VPXOR CC3, BB3, BB3
-	polyMulStage3_AVX2
-	VMOVDQA  CC3, tmpStoreAVX2
-	VPSLLD   $12, BB0, CC3; VPSRLD $20, BB0, BB0; VPXOR CC3, BB0, BB0
-	VPSLLD   $12, BB1, CC3; VPSRLD $20, BB1, BB1; VPXOR CC3, BB1, BB1
-	VPSLLD   $12, BB2, CC3; VPSRLD $20, BB2, BB2; VPXOR CC3, BB2, BB2
-	VPSLLD   $12, BB3, CC3; VPSRLD $20, BB3, BB3; VPXOR CC3, BB3, BB3
-	VMOVDQA  tmpStoreAVX2, CC3
-	polyMulReduceStage
-	VPADDD   BB0, AA0, AA0; VPADDD BB1, AA1, AA1; VPADDD BB2, AA2, AA2; VPADDD BB3, AA3, AA3
-	VPXOR    AA0, DD0, DD0; VPXOR AA1, DD1, DD1; VPXOR AA2, DD2, DD2; VPXOR AA3, DD3, DD3
-	VPSHUFB  ·rol8<>(SB), DD0, DD0; VPSHUFB ·rol8<>(SB), DD1, DD1; VPSHUFB ·rol8<>(SB), DD2, DD2; VPSHUFB ·rol8<>(SB), DD3, DD3
-	polyAdd(2*8(inp)(itr1*1))
-	VPADDD   DD0, CC0, CC0; VPADDD DD1, CC1, CC1; VPADDD DD2, CC2, CC2; VPADDD DD3, CC3, CC3
-	polyMulStage1_AVX2
-	VPXOR    CC0, BB0, BB0; VPXOR CC1, BB1, BB1; VPXOR CC2, BB2, BB2; VPXOR CC3, BB3, BB3
-	VMOVDQA  CC3, tmpStoreAVX2
-	VPSLLD   $7, BB0, CC3; VPSRLD $25, BB0, BB0; VPXOR CC3, BB0, BB0
-	VPSLLD   $7, BB1, CC3; VPSRLD $25, BB1, BB1; VPXOR CC3, BB1, BB1
-	VPSLLD   $7, BB2, CC3; VPSRLD $25, BB2, BB2; VPXOR CC3, BB2, BB2
-	VPSLLD   $7, BB3, CC3; VPSRLD $25, BB3, BB3; VPXOR CC3, BB3, BB3
-	VMOVDQA  tmpStoreAVX2, CC3
-	polyMulStage2_AVX2
-	VPALIGNR $4, BB0, BB0, BB0; VPALIGNR $4, BB1, BB1, BB1; VPALIGNR $4, BB2, BB2, BB2; VPALIGNR $4, BB3, BB3, BB3
-	VPALIGNR $8, CC0, CC0, CC0; VPALIGNR $8, CC1, CC1, CC1; VPALIGNR $8, CC2, CC2, CC2; VPALIGNR $8, CC3, CC3, CC3
-	VPALIGNR $12, DD0, DD0, DD0; VPALIGNR $12, DD1, DD1, DD1; VPALIGNR $12, DD2, DD2, DD2; VPALIGNR $12, DD3, DD3, DD3
-	VPADDD   BB0, AA0, AA0; VPADDD BB1, AA1, AA1; VPADDD BB2, AA2, AA2; VPADDD BB3, AA3, AA3
-	polyMulStage3_AVX2
-	VPXOR    AA0, DD0, DD0; VPXOR AA1, DD1, DD1; VPXOR AA2, DD2, DD2; VPXOR AA3, DD3, DD3
-	VPSHUFB  ·rol16<>(SB), DD0, DD0; VPSHUFB ·rol16<>(SB), DD1, DD1; VPSHUFB ·rol16<>(SB), DD2, DD2; VPSHUFB ·rol16<>(SB), DD3, DD3
-	polyMulReduceStage
-	VPADDD   DD0, CC0, CC0; VPADDD DD1, CC1, CC1; VPADDD DD2, CC2, CC2; VPADDD DD3, CC3, CC3
-	VPXOR    CC0, BB0, BB0; VPXOR CC1, BB1, BB1; VPXOR CC2, BB2, BB2; VPXOR CC3, BB3, BB3
-	polyAdd(4*8(inp)(itr1*1))
-	LEAQ     (6*8)(itr1), itr1
-	VMOVDQA  CC3, tmpStoreAVX2
-	VPSLLD   $12, BB0, CC3; VPSRLD $20, BB0, BB0; VPXOR CC3, BB0, BB0
-	VPSLLD   $12, BB1, CC3; VPSRLD $20, BB1, BB1; VPXOR CC3, BB1, BB1
-	VPSLLD   $12, BB2, CC3; VPSRLD $20, BB2, BB2; VPXOR CC3, BB2, BB2
-	VPSLLD   $12, BB3, CC3; VPSRLD $20, BB3, BB3; VPXOR CC3, BB3, BB3
-	VMOVDQA  tmpStoreAVX2, CC3
-	polyMulStage1_AVX2
-	VPADDD   BB0, AA0, AA0; VPADDD BB1, AA1, AA1; VPADDD BB2, AA2, AA2; VPADDD BB3, AA3, AA3
-	VPXOR    AA0, DD0, DD0; VPXOR AA1, DD1, DD1; VPXOR AA2, DD2, DD2; VPXOR AA3, DD3, DD3
-	polyMulStage2_AVX2
-	VPSHUFB  ·rol8<>(SB), DD0, DD0; VPSHUFB ·rol8<>(SB), DD1, DD1; VPSHUFB ·rol8<>(SB), DD2, DD2; VPSHUFB ·rol8<>(SB), DD3, DD3
-	VPADDD   DD0, CC0, CC0; VPADDD DD1, CC1, CC1; VPADDD DD2, CC2, CC2; VPADDD DD3, CC3, CC3
-	polyMulStage3_AVX2
-	VPXOR    CC0, BB0, BB0; VPXOR CC1, BB1, BB1; VPXOR CC2, BB2, BB2; VPXOR CC3, BB3, BB3
-	VMOVDQA  CC3, tmpStoreAVX2
-	VPSLLD   $7, BB0, CC3; VPSRLD $25, BB0, BB0; VPXOR CC3, BB0, BB0
-	VPSLLD   $7, BB1, CC3; VPSRLD $25, BB1, BB1; VPXOR CC3, BB1, BB1
-	VPSLLD   $7, BB2, CC3; VPSRLD $25, BB2, BB2; VPXOR CC3, BB2, BB2
-	VPSLLD   $7, BB3, CC3; VPSRLD $25, BB3, BB3; VPXOR CC3, BB3, BB3
-	VMOVDQA  tmpStoreAVX2, CC3
-	polyMulReduceStage
-	VPALIGNR $12, BB0, BB0, BB0; VPALIGNR $12, BB1, BB1, BB1; VPALIGNR $12, BB2, BB2, BB2; VPALIGNR $12, BB3, BB3, BB3
-	VPALIGNR $8, CC0, CC0, CC0; VPALIGNR $8, CC1, CC1, CC1; VPALIGNR $8, CC2, CC2, CC2; VPALIGNR $8, CC3, CC3, CC3
-	VPALIGNR $4, DD0, DD0, DD0; VPALIGNR $4, DD1, DD1, DD1; VPALIGNR $4, DD2, DD2, DD2; VPALIGNR $4, DD3, DD3, DD3
-	CMPQ     itr1, $480
+	ADDQ     (SI)(CX*1), R10
+	ADCQ     8(SI)(CX*1), R11
+	ADCQ     $0x01, R12
+	VPADDD   Y14, Y0, Y0
+	VPADDD   Y9, Y5, Y5
+	VPADDD   Y10, Y6, Y6
+	VPADDD   Y11, Y7, Y7
+	MOVQ     (BP), DX
+	MOVQ     DX, R15
+	MULXQ    R10, R13, R14
+	IMULQ    R12, R15
+	MULXQ    R11, AX, DX
+	ADDQ     AX, R14
+	ADCQ     DX, R15
+	VPXOR    Y0, Y4, Y4
+	VPXOR    Y5, Y1, Y1
+	VPXOR    Y6, Y2, Y2
+	VPXOR    Y7, Y3, Y3
+	VPSHUFB  ·rol16<>+0(SB), Y4, Y4
+	VPSHUFB  ·rol16<>+0(SB), Y1, Y1
+	VPSHUFB  ·rol16<>+0(SB), Y2, Y2
+	VPSHUFB  ·rol16<>+0(SB), Y3, Y3
+	MOVQ     8(BP), DX
+	MULXQ    R10, R10, AX
+	ADDQ     R10, R14
+	MULXQ    R11, R11, R8
+	ADCQ     R11, R15
+	ADCQ     $0x00, R8
+	VPADDD   Y4, Y12, Y12
+	VPADDD   Y1, Y13, Y13
+	VPADDD   Y2, Y8, Y8
+	VPADDD   Y3, Y15, Y15
+	VPXOR    Y12, Y14, Y14
+	VPXOR    Y13, Y9, Y9
+	VPXOR    Y8, Y10, Y10
+	VPXOR    Y15, Y11, Y11
+	IMULQ    R12, DX
+	ADDQ     AX, R15
+	ADCQ     DX, R8
+	VMOVDQA  Y15, 224(BP)
+	VPSLLD   $0x0c, Y14, Y15
+	VPSRLD   $0x14, Y14, Y14
+	VPXOR    Y15, Y14, Y14
+	VPSLLD   $0x0c, Y9, Y15
+	VPSRLD   $0x14, Y9, Y9
+	VPXOR    Y15, Y9, Y9
+	VPSLLD   $0x0c, Y10, Y15
+	VPSRLD   $0x14, Y10, Y10
+	VPXOR    Y15, Y10, Y10
+	VPSLLD   $0x0c, Y11, Y15
+	VPSRLD   $0x14, Y11, Y11
+	VPXOR    Y15, Y11, Y11
+	VMOVDQA  224(BP), Y15
+	MOVQ     R13, R10
+	MOVQ     R14, R11
+	MOVQ     R15, R12
+	ANDQ     $0x03, R12
+	MOVQ     R15, R13
+	ANDQ     $-4, R13
+	MOVQ     R8, R14
+	SHRQ     $0x02, R8, R15
+	SHRQ     $0x02, R8
+	ADDQ     R13, R10
+	ADCQ     R14, R11
+	ADCQ     $0x00, R12
+	ADDQ     R15, R10
+	ADCQ     R8, R11
+	ADCQ     $0x00, R12
+	VPADDD   Y14, Y0, Y0
+	VPADDD   Y9, Y5, Y5
+	VPADDD   Y10, Y6, Y6
+	VPADDD   Y11, Y7, Y7
+	VPXOR    Y0, Y4, Y4
+	VPXOR    Y5, Y1, Y1
+	VPXOR    Y6, Y2, Y2
+	VPXOR    Y7, Y3, Y3
+	VPSHUFB  ·rol8<>+0(SB), Y4, Y4
+	VPSHUFB  ·rol8<>+0(SB), Y1, Y1
+	VPSHUFB  ·rol8<>+0(SB), Y2, Y2
+	VPSHUFB  ·rol8<>+0(SB), Y3, Y3
+	ADDQ     16(SI)(CX*1), R10
+	ADCQ     24(SI)(CX*1), R11
+	ADCQ     $0x01, R12
+	VPADDD   Y4, Y12, Y12
+	VPADDD   Y1, Y13, Y13
+	VPADDD   Y2, Y8, Y8
+	VPADDD   Y3, Y15, Y15
+	MOVQ     (BP), DX
+	MOVQ     DX, R15
+	MULXQ    R10, R13, R14
+	IMULQ    R12, R15
+	MULXQ    R11, AX, DX
+	ADDQ     AX, R14
+	ADCQ     DX, R15
+	VPXOR    Y12, Y14, Y14
+	VPXOR    Y13, Y9, Y9
+	VPXOR    Y8, Y10, Y10
+	VPXOR    Y15, Y11, Y11
+	VMOVDQA  Y15, 224(BP)
+	VPSLLD   $0x07, Y14, Y15
+	VPSRLD   $0x19, Y14, Y14
+	VPXOR    Y15, Y14, Y14
+	VPSLLD   $0x07, Y9, Y15
+	VPSRLD   $0x19, Y9, Y9
+	VPXOR    Y15, Y9, Y9
+	VPSLLD   $0x07, Y10, Y15
+	VPSRLD   $0x19, Y10, Y10
+	VPXOR    Y15, Y10, Y10
+	VPSLLD   $0x07, Y11, Y15
+	VPSRLD   $0x19, Y11, Y11
+	VPXOR    Y15, Y11, Y11
+	VMOVDQA  224(BP), Y15
+	MOVQ     8(BP), DX
+	MULXQ    R10, R10, AX
+	ADDQ     R10, R14
+	MULXQ    R11, R11, R8
+	ADCQ     R11, R15
+	ADCQ     $0x00, R8
+	VPALIGNR $0x04, Y14, Y14, Y14
+	VPALIGNR $0x04, Y9, Y9, Y9
+	VPALIGNR $0x04, Y10, Y10, Y10
+	VPALIGNR $0x04, Y11, Y11, Y11
+	VPALIGNR $0x08, Y12, Y12, Y12
+	VPALIGNR $0x08, Y13, Y13, Y13
+	VPALIGNR $0x08, Y8, Y8, Y8
+	VPALIGNR $0x08, Y15, Y15, Y15
+	VPALIGNR $0x0c, Y4, Y4, Y4
+	VPALIGNR $0x0c, Y1, Y1, Y1
+	VPALIGNR $0x0c, Y2, Y2, Y2
+	VPALIGNR $0x0c, Y3, Y3, Y3
+	VPADDD   Y14, Y0, Y0
+	VPADDD   Y9, Y5, Y5
+	VPADDD   Y10, Y6, Y6
+	VPADDD   Y11, Y7, Y7
+	IMULQ    R12, DX
+	ADDQ     AX, R15
+	ADCQ     DX, R8
+	VPXOR    Y0, Y4, Y4
+	VPXOR    Y5, Y1, Y1
+	VPXOR    Y6, Y2, Y2
+	VPXOR    Y7, Y3, Y3
+	VPSHUFB  ·rol16<>+0(SB), Y4, Y4
+	VPSHUFB  ·rol16<>+0(SB), Y1, Y1
+	VPSHUFB  ·rol16<>+0(SB), Y2, Y2
+	VPSHUFB  ·rol16<>+0(SB), Y3, Y3
+	MOVQ     R13, R10
+	MOVQ     R14, R11
+	MOVQ     R15, R12
+	ANDQ     $0x03, R12
+	MOVQ     R15, R13
+	ANDQ     $-4, R13
+	MOVQ     R8, R14
+	SHRQ     $0x02, R8, R15
+	SHRQ     $0x02, R8
+	ADDQ     R13, R10
+	ADCQ     R14, R11
+	ADCQ     $0x00, R12
+	ADDQ     R15, R10
+	ADCQ     R8, R11
+	ADCQ     $0x00, R12
+	VPADDD   Y4, Y12, Y12
+	VPADDD   Y1, Y13, Y13
+	VPADDD   Y2, Y8, Y8
+	VPADDD   Y3, Y15, Y15
+	VPXOR    Y12, Y14, Y14
+	VPXOR    Y13, Y9, Y9
+	VPXOR    Y8, Y10, Y10
+	VPXOR    Y15, Y11, Y11
+	ADDQ     32(SI)(CX*1), R10
+	ADCQ     40(SI)(CX*1), R11
+	ADCQ     $0x01, R12
+	LEAQ     48(CX), CX
+	VMOVDQA  Y15, 224(BP)
+	VPSLLD   $0x0c, Y14, Y15
+	VPSRLD   $0x14, Y14, Y14
+	VPXOR    Y15, Y14, Y14
+	VPSLLD   $0x0c, Y9, Y15
+	VPSRLD   $0x14, Y9, Y9
+	VPXOR    Y15, Y9, Y9
+	VPSLLD   $0x0c, Y10, Y15
+	VPSRLD   $0x14, Y10, Y10
+	VPXOR    Y15, Y10, Y10
+	VPSLLD   $0x0c, Y11, Y15
+	VPSRLD   $0x14, Y11, Y11
+	VPXOR    Y15, Y11, Y11
+	VMOVDQA  224(BP), Y15
+	MOVQ     (BP), DX
+	MOVQ     DX, R15
+	MULXQ    R10, R13, R14
+	IMULQ    R12, R15
+	MULXQ    R11, AX, DX
+	ADDQ     AX, R14
+	ADCQ     DX, R15
+	VPADDD   Y14, Y0, Y0
+	VPADDD   Y9, Y5, Y5
+	VPADDD   Y10, Y6, Y6
+	VPADDD   Y11, Y7, Y7
+	VPXOR    Y0, Y4, Y4
+	VPXOR    Y5, Y1, Y1
+	VPXOR    Y6, Y2, Y2
+	VPXOR    Y7, Y3, Y3
+	MOVQ     8(BP), DX
+	MULXQ    R10, R10, AX
+	ADDQ     R10, R14
+	MULXQ    R11, R11, R8
+	ADCQ     R11, R15
+	ADCQ     $0x00, R8
+	VPSHUFB  ·rol8<>+0(SB), Y4, Y4
+	VPSHUFB  ·rol8<>+0(SB), Y1, Y1
+	VPSHUFB  ·rol8<>+0(SB), Y2, Y2
+	VPSHUFB  ·rol8<>+0(SB), Y3, Y3
+	VPADDD   Y4, Y12, Y12
+	VPADDD   Y1, Y13, Y13
+	VPADDD   Y2, Y8, Y8
+	VPADDD   Y3, Y15, Y15
+	IMULQ    R12, DX
+	ADDQ     AX, R15
+	ADCQ     DX, R8
+	VPXOR    Y12, Y14, Y14
+	VPXOR    Y13, Y9, Y9
+	VPXOR    Y8, Y10, Y10
+	VPXOR    Y15, Y11, Y11
+	VMOVDQA  Y15, 224(BP)
+	VPSLLD   $0x07, Y14, Y15
+	VPSRLD   $0x19, Y14, Y14
+	VPXOR    Y15, Y14, Y14
+	VPSLLD   $0x07, Y9, Y15
+	VPSRLD   $0x19, Y9, Y9
+	VPXOR    Y15, Y9, Y9
+	VPSLLD   $0x07, Y10, Y15
+	VPSRLD   $0x19, Y10, Y10
+	VPXOR    Y15, Y10, Y10
+	VPSLLD   $0x07, Y11, Y15
+	VPSRLD   $0x19, Y11, Y11
+	VPXOR    Y15, Y11, Y11
+	VMOVDQA  224(BP), Y15
+	MOVQ     R13, R10
+	MOVQ     R14, R11
+	MOVQ     R15, R12
+	ANDQ     $0x03, R12
+	MOVQ     R15, R13
+	ANDQ     $-4, R13
+	MOVQ     R8, R14
+	SHRQ     $0x02, R8, R15
+	SHRQ     $0x02, R8
+	ADDQ     R13, R10
+	ADCQ     R14, R11
+	ADCQ     $0x00, R12
+	ADDQ     R15, R10
+	ADCQ     R8, R11
+	ADCQ     $0x00, R12
+	VPALIGNR $0x0c, Y14, Y14, Y14
+	VPALIGNR $0x0c, Y9, Y9, Y9
+	VPALIGNR $0x0c, Y10, Y10, Y10
+	VPALIGNR $0x0c, Y11, Y11, Y11
+	VPALIGNR $0x08, Y12, Y12, Y12
+	VPALIGNR $0x08, Y13, Y13, Y13
+	VPALIGNR $0x08, Y8, Y8, Y8
+	VPALIGNR $0x08, Y15, Y15, Y15
+	VPALIGNR $0x04, Y4, Y4, Y4
+	VPALIGNR $0x04, Y1, Y1, Y1
+	VPALIGNR $0x04, Y2, Y2, Y2
+	VPALIGNR $0x04, Y3, Y3, Y3
+	CMPQ     CX, $0x000001e0
 	JNE      openAVX2InternalLoop
-
-	VPADDD  ·chacha20Constants<>(SB), AA0, AA0; VPADDD ·chacha20Constants<>(SB), AA1, AA1; VPADDD ·chacha20Constants<>(SB), AA2, AA2; VPADDD ·chacha20Constants<>(SB), AA3, AA3
-	VPADDD  state1StoreAVX2, BB0, BB0; VPADDD state1StoreAVX2, BB1, BB1; VPADDD state1StoreAVX2, BB2, BB2; VPADDD state1StoreAVX2, BB3, BB3
-	VPADDD  state2StoreAVX2, CC0, CC0; VPADDD state2StoreAVX2, CC1, CC1; VPADDD state2StoreAVX2, CC2, CC2; VPADDD state2StoreAVX2, CC3, CC3
-	VPADDD  ctr0StoreAVX2, DD0, DD0; VPADDD ctr1StoreAVX2, DD1, DD1; VPADDD ctr2StoreAVX2, DD2, DD2; VPADDD ctr3StoreAVX2, DD3, DD3
-	VMOVDQA CC3, tmpStoreAVX2
+	VPADDD   ·chacha20Constants<>+0(SB), Y0, Y0
+	VPADDD   ·chacha20Constants<>+0(SB), Y5, Y5
+	VPADDD   ·chacha20Constants<>+0(SB), Y6, Y6
+	VPADDD   ·chacha20Constants<>+0(SB), Y7, Y7
+	VPADDD   32(BP), Y14, Y14
+	VPADDD   32(BP), Y9, Y9
+	VPADDD   32(BP), Y10, Y10
+	VPADDD   32(BP), Y11, Y11
+	VPADDD   64(BP), Y12, Y12
+	VPADDD   64(BP), Y13, Y13
+	VPADDD   64(BP), Y8, Y8
+	VPADDD   64(BP), Y15, Y15
+	VPADDD   96(BP), Y4, Y4
+	VPADDD   128(BP), Y1, Y1
+	VPADDD   160(BP), Y2, Y2
+	VPADDD   192(BP), Y3, Y3
+	VMOVDQA  Y15, 224(BP)
 
 	// We only hashed 480 of the 512 bytes available - hash the remaining 32 here
-	polyAdd(480(inp))
-	polyMulAVX2
-	VPERM2I128 $0x02, AA0, BB0, CC3; VPERM2I128 $0x13, AA0, BB0, BB0; VPERM2I128 $0x02, CC0, DD0, AA0; VPERM2I128 $0x13, CC0, DD0, CC0
-	VPXOR      (0*32)(inp), CC3, CC3; VPXOR (1*32)(inp), AA0, AA0; VPXOR (2*32)(inp), BB0, BB0; VPXOR (3*32)(inp), CC0, CC0
-	VMOVDQU    CC3, (0*32)(oup); VMOVDQU AA0, (1*32)(oup); VMOVDQU BB0, (2*32)(oup); VMOVDQU CC0, (3*32)(oup)
-	VPERM2I128 $0x02, AA1, BB1, AA0; VPERM2I128 $0x02, CC1, DD1, BB0; VPERM2I128 $0x13, AA1, BB1, CC0; VPERM2I128 $0x13, CC1, DD1, DD0
-	VPXOR      (4*32)(inp), AA0, AA0; VPXOR (5*32)(inp), BB0, BB0; VPXOR (6*32)(inp), CC0, CC0; VPXOR (7*32)(inp), DD0, DD0
-	VMOVDQU    AA0, (4*32)(oup); VMOVDQU BB0, (5*32)(oup); VMOVDQU CC0, (6*32)(oup); VMOVDQU DD0, (7*32)(oup)
+	ADDQ       480(SI), R10
+	ADCQ       488(SI), R11
+	ADCQ       $0x01, R12
+	MOVQ       (BP), DX
+	MOVQ       DX, R15
+	MULXQ      R10, R13, R14
+	IMULQ      R12, R15
+	MULXQ      R11, AX, DX
+	ADDQ       AX, R14
+	ADCQ       DX, R15
+	MOVQ       8(BP), DX
+	MULXQ      R10, R10, AX
+	ADDQ       R10, R14
+	MULXQ      R11, R11, R8
+	ADCQ       R11, R15
+	ADCQ       $0x00, R8
+	IMULQ      R12, DX
+	ADDQ       AX, R15
+	ADCQ       DX, R8
+	MOVQ       R13, R10
+	MOVQ       R14, R11
+	MOVQ       R15, R12
+	ANDQ       $0x03, R12
+	MOVQ       R15, R13
+	ANDQ       $-4, R13
+	MOVQ       R8, R14
+	SHRQ       $0x02, R8, R15
+	SHRQ       $0x02, R8
+	ADDQ       R13, R10
+	ADCQ       R14, R11
+	ADCQ       $0x00, R12
+	ADDQ       R15, R10
+	ADCQ       R8, R11
+	ADCQ       $0x00, R12
+	VPERM2I128 $0x02, Y0, Y14, Y15
+	VPERM2I128 $0x13, Y0, Y14, Y14
+	VPERM2I128 $0x02, Y12, Y4, Y0
+	VPERM2I128 $0x13, Y12, Y4, Y12
+	VPXOR      (SI), Y15, Y15
+	VPXOR      32(SI), Y0, Y0
+	VPXOR      64(SI), Y14, Y14
+	VPXOR      96(SI), Y12, Y12
+	VMOVDQU    Y15, (DI)
+	VMOVDQU    Y0, 32(DI)
+	VMOVDQU    Y14, 64(DI)
+	VMOVDQU    Y12, 96(DI)
+	VPERM2I128 $0x02, Y5, Y9, Y0
+	VPERM2I128 $0x02, Y13, Y1, Y14
+	VPERM2I128 $0x13, Y5, Y9, Y12
+	VPERM2I128 $0x13, Y13, Y1, Y4
+	VPXOR      128(SI), Y0, Y0
+	VPXOR      160(SI), Y14, Y14
+	VPXOR      192(SI), Y12, Y12
+	VPXOR      224(SI), Y4, Y4
+	VMOVDQU    Y0, 128(DI)
+	VMOVDQU    Y14, 160(DI)
+	VMOVDQU    Y12, 192(DI)
+	VMOVDQU    Y4, 224(DI)
 
 	// and here
-	polyAdd(496(inp))
-	polyMulAVX2
-	VPERM2I128 $0x02, AA2, BB2, AA0; VPERM2I128 $0x02, CC2, DD2, BB0; VPERM2I128 $0x13, AA2, BB2, CC0; VPERM2I128 $0x13, CC2, DD2, DD0
-	VPXOR      (8*32)(inp), AA0, AA0; VPXOR (9*32)(inp), BB0, BB0; VPXOR (10*32)(inp), CC0, CC0; VPXOR (11*32)(inp), DD0, DD0
-	VMOVDQU    AA0, (8*32)(oup); VMOVDQU BB0, (9*32)(oup); VMOVDQU CC0, (10*32)(oup); VMOVDQU DD0, (11*32)(oup)
-	VPERM2I128 $0x02, AA3, BB3, AA0; VPERM2I128 $0x02, tmpStoreAVX2, DD3, BB0; VPERM2I128 $0x13, AA3, BB3, CC0; VPERM2I128 $0x13, tmpStoreAVX2, DD3, DD0
-	VPXOR      (12*32)(inp), AA0, AA0; VPXOR (13*32)(inp), BB0, BB0; VPXOR (14*32)(inp), CC0, CC0; VPXOR (15*32)(inp), DD0, DD0
-	VMOVDQU    AA0, (12*32)(oup); VMOVDQU BB0, (13*32)(oup); VMOVDQU CC0, (14*32)(oup); VMOVDQU DD0, (15*32)(oup)
-	LEAQ       (32*16)(inp), inp
-	LEAQ       (32*16)(oup), oup
-	SUBQ       $(32*16), inl
+	ADDQ       496(SI), R10
+	ADCQ       504(SI), R11
+	ADCQ       $0x01, R12
+	MOVQ       (BP), DX
+	MOVQ       DX, R15
+	MULXQ      R10, R13, R14
+	IMULQ      R12, R15
+	MULXQ      R11, AX, DX
+	ADDQ       AX, R14
+	ADCQ       DX, R15
+	MOVQ       8(BP), DX
+	MULXQ      R10, R10, AX
+	ADDQ       R10, R14
+	MULXQ      R11, R11, R8
+	ADCQ       R11, R15
+	ADCQ       $0x00, R8
+	IMULQ      R12, DX
+	ADDQ       AX, R15
+	ADCQ       DX, R8
+	MOVQ       R13, R10
+	MOVQ       R14, R11
+	MOVQ       R15, R12
+	ANDQ       $0x03, R12
+	MOVQ       R15, R13
+	ANDQ       $-4, R13
+	MOVQ       R8, R14
+	SHRQ       $0x02, R8, R15
+	SHRQ       $0x02, R8
+	ADDQ       R13, R10
+	ADCQ       R14, R11
+	ADCQ       $0x00, R12
+	ADDQ       R15, R10
+	ADCQ       R8, R11
+	ADCQ       $0x00, R12
+	VPERM2I128 $0x02, Y6, Y10, Y0
+	VPERM2I128 $0x02, Y8, Y2, Y14
+	VPERM2I128 $0x13, Y6, Y10, Y12
+	VPERM2I128 $0x13, Y8, Y2, Y4
+	VPXOR      256(SI), Y0, Y0
+	VPXOR      288(SI), Y14, Y14
+	VPXOR      320(SI), Y12, Y12
+	VPXOR      352(SI), Y4, Y4
+	VMOVDQU    Y0, 256(DI)
+	VMOVDQU    Y14, 288(DI)
+	VMOVDQU    Y12, 320(DI)
+	VMOVDQU    Y4, 352(DI)
+	VPERM2I128 $0x02, Y7, Y11, Y0
+	VPERM2I128 $0x02, 224(BP), Y3, Y14
+	VPERM2I128 $0x13, Y7, Y11, Y12
+	VPERM2I128 $0x13, 224(BP), Y3, Y4
+	VPXOR      384(SI), Y0, Y0
+	VPXOR      416(SI), Y14, Y14
+	VPXOR      448(SI), Y12, Y12
+	VPXOR      480(SI), Y4, Y4
+	VMOVDQU    Y0, 384(DI)
+	VMOVDQU    Y14, 416(DI)
+	VMOVDQU    Y12, 448(DI)
+	VMOVDQU    Y4, 480(DI)
+	LEAQ       512(SI), SI
+	LEAQ       512(DI), DI
+	SUBQ       $0x00000200, BX
 	JMP        openAVX2MainLoop
 
 openAVX2MainLoopDone:
 	// Handle the various tail sizes efficiently
-	TESTQ inl, inl
+	TESTQ BX, BX
 	JE    openSSEFinalize
-	CMPQ  inl, $128
+	CMPQ  BX, $0x80
 	JBE   openAVX2Tail128
-	CMPQ  inl, $256
+	CMPQ  BX, $0x00000100
 	JBE   openAVX2Tail256
-	CMPQ  inl, $384
+	CMPQ  BX, $0x00000180
 	JBE   openAVX2Tail384
 	JMP   openAVX2Tail512
 
-// ----------------------------------------------------------------------------
-// Special optimization for buffers smaller than 193 bytes
 openAVX2192:
-	// For up to 192 bytes of ciphertext and 64 bytes for the poly key, we process four blocks
-	VMOVDQA AA0, AA1
-	VMOVDQA BB0, BB1
-	VMOVDQA CC0, CC1
-	VPADDD  ·avx2IncMask<>(SB), DD0, DD1
-	VMOVDQA AA0, AA2
-	VMOVDQA BB0, BB2
-	VMOVDQA CC0, CC2
-	VMOVDQA DD0, DD2
-	VMOVDQA DD1, TT3
-	MOVQ    $10, itr2
+	VMOVDQA Y0, Y5
+	VMOVDQA Y14, Y9
+	VMOVDQA Y12, Y13
+	VPADDD  ·avx2IncMask<>+0(SB), Y4, Y1
+	VMOVDQA Y0, Y6
+	VMOVDQA Y14, Y10
+	VMOVDQA Y12, Y8
+	VMOVDQA Y4, Y2
+	VMOVDQA Y1, Y15
+	MOVQ    $0x0000000a, R9
 
 openAVX2192InnerCipherLoop:
-	chachaQR_AVX2(AA0, BB0, CC0, DD0, TT0); chachaQR_AVX2(AA1, BB1, CC1, DD1, TT0)
-	VPALIGNR   $4, BB0, BB0, BB0; VPALIGNR $4, BB1, BB1, BB1
-	VPALIGNR   $8, CC0, CC0, CC0; VPALIGNR $8, CC1, CC1, CC1
-	VPALIGNR   $12, DD0, DD0, DD0; VPALIGNR $12, DD1, DD1, DD1
-	chachaQR_AVX2(AA0, BB0, CC0, DD0, TT0); chachaQR_AVX2(AA1, BB1, CC1, DD1, TT0)
-	VPALIGNR   $12, BB0, BB0, BB0; VPALIGNR $12, BB1, BB1, BB1
-	VPALIGNR   $8, CC0, CC0, CC0; VPALIGNR $8, CC1, CC1, CC1
-	VPALIGNR   $4, DD0, DD0, DD0; VPALIGNR $4, DD1, DD1, DD1
-	DECQ       itr2
+	VPADDD     Y14, Y0, Y0
+	VPXOR      Y0, Y4, Y4
+	VPSHUFB    ·rol16<>+0(SB), Y4, Y4
+	VPADDD     Y4, Y12, Y12
+	VPXOR      Y12, Y14, Y14
+	VPSLLD     $0x0c, Y14, Y3
+	VPSRLD     $0x14, Y14, Y14
+	VPXOR      Y3, Y14, Y14
+	VPADDD     Y14, Y0, Y0
+	VPXOR      Y0, Y4, Y4
+	VPSHUFB    ·rol8<>+0(SB), Y4, Y4
+	VPADDD     Y4, Y12, Y12
+	VPXOR      Y12, Y14, Y14
+	VPSLLD     $0x07, Y14, Y3
+	VPSRLD     $0x19, Y14, Y14
+	VPXOR      Y3, Y14, Y14
+	VPADDD     Y9, Y5, Y5
+	VPXOR      Y5, Y1, Y1
+	VPSHUFB    ·rol16<>+0(SB), Y1, Y1
+	VPADDD     Y1, Y13, Y13
+	VPXOR      Y13, Y9, Y9
+	VPSLLD     $0x0c, Y9, Y3
+	VPSRLD     $0x14, Y9, Y9
+	VPXOR      Y3, Y9, Y9
+	VPADDD     Y9, Y5, Y5
+	VPXOR      Y5, Y1, Y1
+	VPSHUFB    ·rol8<>+0(SB), Y1, Y1
+	VPADDD     Y1, Y13, Y13
+	VPXOR      Y13, Y9, Y9
+	VPSLLD     $0x07, Y9, Y3
+	VPSRLD     $0x19, Y9, Y9
+	VPXOR      Y3, Y9, Y9
+	VPALIGNR   $0x04, Y14, Y14, Y14
+	VPALIGNR   $0x04, Y9, Y9, Y9
+	VPALIGNR   $0x08, Y12, Y12, Y12
+	VPALIGNR   $0x08, Y13, Y13, Y13
+	VPALIGNR   $0x0c, Y4, Y4, Y4
+	VPALIGNR   $0x0c, Y1, Y1, Y1
+	VPADDD     Y14, Y0, Y0
+	VPXOR      Y0, Y4, Y4
+	VPSHUFB    ·rol16<>+0(SB), Y4, Y4
+	VPADDD     Y4, Y12, Y12
+	VPXOR      Y12, Y14, Y14
+	VPSLLD     $0x0c, Y14, Y3
+	VPSRLD     $0x14, Y14, Y14
+	VPXOR      Y3, Y14, Y14
+	VPADDD     Y14, Y0, Y0
+	VPXOR      Y0, Y4, Y4
+	VPSHUFB    ·rol8<>+0(SB), Y4, Y4
+	VPADDD     Y4, Y12, Y12
+	VPXOR      Y12, Y14, Y14
+	VPSLLD     $0x07, Y14, Y3
+	VPSRLD     $0x19, Y14, Y14
+	VPXOR      Y3, Y14, Y14
+	VPADDD     Y9, Y5, Y5
+	VPXOR      Y5, Y1, Y1
+	VPSHUFB    ·rol16<>+0(SB), Y1, Y1
+	VPADDD     Y1, Y13, Y13
+	VPXOR      Y13, Y9, Y9
+	VPSLLD     $0x0c, Y9, Y3
+	VPSRLD     $0x14, Y9, Y9
+	VPXOR      Y3, Y9, Y9
+	VPADDD     Y9, Y5, Y5
+	VPXOR      Y5, Y1, Y1
+	VPSHUFB    ·rol8<>+0(SB), Y1, Y1
+	VPADDD     Y1, Y13, Y13
+	VPXOR      Y13, Y9, Y9
+	VPSLLD     $0x07, Y9, Y3
+	VPSRLD     $0x19, Y9, Y9
+	VPXOR      Y3, Y9, Y9
+	VPALIGNR   $0x0c, Y14, Y14, Y14
+	VPALIGNR   $0x0c, Y9, Y9, Y9
+	VPALIGNR   $0x08, Y12, Y12, Y12
+	VPALIGNR   $0x08, Y13, Y13, Y13
+	VPALIGNR   $0x04, Y4, Y4, Y4
+	VPALIGNR   $0x04, Y1, Y1, Y1
+	DECQ       R9
 	JNE        openAVX2192InnerCipherLoop
-	VPADDD     AA2, AA0, AA0; VPADDD AA2, AA1, AA1
-	VPADDD     BB2, BB0, BB0; VPADDD BB2, BB1, BB1
-	VPADDD     CC2, CC0, CC0; VPADDD CC2, CC1, CC1
-	VPADDD     DD2, DD0, DD0; VPADDD TT3, DD1, DD1
-	VPERM2I128 $0x02, AA0, BB0, TT0
+	VPADDD     Y6, Y0, Y0
+	VPADDD     Y6, Y5, Y5
+	VPADDD     Y10, Y14, Y14
+	VPADDD     Y10, Y9, Y9
+	VPADDD     Y8, Y12, Y12
+	VPADDD     Y8, Y13, Y13
+	VPADDD     Y2, Y4, Y4
+	VPADDD     Y15, Y1, Y1
+	VPERM2I128 $0x02, Y0, Y14, Y3
 
 	// Clamp and store poly key
-	VPAND   ·polyClampMask<>(SB), TT0, TT0
-	VMOVDQA TT0, rsStoreAVX2
+	VPAND   ·polyClampMask<>+0(SB), Y3, Y3
+	VMOVDQA Y3, (BP)
 
 	// Stream for up to 192 bytes
-	VPERM2I128 $0x13, AA0, BB0, AA0
-	VPERM2I128 $0x13, CC0, DD0, BB0
-	VPERM2I128 $0x02, AA1, BB1, CC0
-	VPERM2I128 $0x02, CC1, DD1, DD0
-	VPERM2I128 $0x13, AA1, BB1, AA1
-	VPERM2I128 $0x13, CC1, DD1, BB1
+	VPERM2I128 $0x13, Y0, Y14, Y0
+	VPERM2I128 $0x13, Y12, Y4, Y14
+	VPERM2I128 $0x02, Y5, Y9, Y12
+	VPERM2I128 $0x02, Y13, Y1, Y4
+	VPERM2I128 $0x13, Y5, Y9, Y5
+	VPERM2I128 $0x13, Y13, Y1, Y9
 
 openAVX2ShortOpen:
 	// Hash
-	MOVQ ad_len+80(FP), itr2
+	MOVQ ad_len+80(FP), R9
 	CALL polyHashADInternal<>(SB)
 
 openAVX2ShortOpenLoop:
-	CMPQ inl, $32
+	CMPQ BX, $0x20
 	JB   openAVX2ShortTail32
-	SUBQ $32, inl
+	SUBQ $0x20, BX
 
 	// Load for hashing
-	polyAdd(0*8(inp))
-	polyMulAVX2
-	polyAdd(2*8(inp))
-	polyMulAVX2
+	ADDQ  (SI), R10
+	ADCQ  8(SI), R11
+	ADCQ  $0x01, R12
+	MOVQ  (BP), DX
+	MOVQ  DX, R15
+	MULXQ R10, R13, R14
+	IMULQ R12, R15
+	MULXQ R11, AX, DX
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), DX
+	MULXQ R10, R10, AX
+	ADDQ  R10, R14
+	MULXQ R11, R11, R8
+	ADCQ  R11, R15
+	ADCQ  $0x00, R8
+	IMULQ R12, DX
+	ADDQ  AX, R15
+	ADCQ  DX, R8
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
+	ADDQ  16(SI), R10
+	ADCQ  24(SI), R11
+	ADCQ  $0x01, R12
+	MOVQ  (BP), DX
+	MOVQ  DX, R15
+	MULXQ R10, R13, R14
+	IMULQ R12, R15
+	MULXQ R11, AX, DX
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), DX
+	MULXQ R10, R10, AX
+	ADDQ  R10, R14
+	MULXQ R11, R11, R8
+	ADCQ  R11, R15
+	ADCQ  $0x00, R8
+	IMULQ R12, DX
+	ADDQ  AX, R15
+	ADCQ  DX, R8
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
 
 	// Load for decryption
-	VPXOR   (inp), AA0, AA0
-	VMOVDQU AA0, (oup)
-	LEAQ    (1*32)(inp), inp
-	LEAQ    (1*32)(oup), oup
+	VPXOR   (SI), Y0, Y0
+	VMOVDQU Y0, (DI)
+	LEAQ    32(SI), SI
+	LEAQ    32(DI), DI
 
 	// Shift stream left
-	VMOVDQA BB0, AA0
-	VMOVDQA CC0, BB0
-	VMOVDQA DD0, CC0
-	VMOVDQA AA1, DD0
-	VMOVDQA BB1, AA1
-	VMOVDQA CC1, BB1
-	VMOVDQA DD1, CC1
-	VMOVDQA AA2, DD1
-	VMOVDQA BB2, AA2
+	VMOVDQA Y14, Y0
+	VMOVDQA Y12, Y14
+	VMOVDQA Y4, Y12
+	VMOVDQA Y5, Y4
+	VMOVDQA Y9, Y5
+	VMOVDQA Y13, Y9
+	VMOVDQA Y1, Y13
+	VMOVDQA Y6, Y1
+	VMOVDQA Y10, Y6
 	JMP     openAVX2ShortOpenLoop
 
 openAVX2ShortTail32:
-	CMPQ    inl, $16
-	VMOVDQA A0, A1
+	CMPQ    BX, $0x10
+	VMOVDQA X0, X1
 	JB      openAVX2ShortDone
-
-	SUBQ $16, inl
+	SUBQ    $0x10, BX
 
 	// Load for hashing
-	polyAdd(0*8(inp))
-	polyMulAVX2
+	ADDQ  (SI), R10
+	ADCQ  8(SI), R11
+	ADCQ  $0x01, R12
+	MOVQ  (BP), DX
+	MOVQ  DX, R15
+	MULXQ R10, R13, R14
+	IMULQ R12, R15
+	MULXQ R11, AX, DX
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), DX
+	MULXQ R10, R10, AX
+	ADDQ  R10, R14
+	MULXQ R11, R11, R8
+	ADCQ  R11, R15
+	ADCQ  $0x00, R8
+	IMULQ R12, DX
+	ADDQ  AX, R15
+	ADCQ  DX, R8
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
 
 	// Load for decryption
-	VPXOR      (inp), A0, T0
-	VMOVDQU    T0, (oup)
-	LEAQ       (1*16)(inp), inp
-	LEAQ       (1*16)(oup), oup
-	VPERM2I128 $0x11, AA0, AA0, AA0
-	VMOVDQA    A0, A1
+	VPXOR      (SI), X0, X12
+	VMOVDQU    X12, (DI)
+	LEAQ       16(SI), SI
+	LEAQ       16(DI), DI
+	VPERM2I128 $0x11, Y0, Y0, Y0
+	VMOVDQA    X0, X1
 
 openAVX2ShortDone:
 	VZEROUPPER
 	JMP openSSETail16
 
-// ----------------------------------------------------------------------------
-// Special optimization for buffers smaller than 321 bytes
 openAVX2320:
-	// For up to 320 bytes of ciphertext and 64 bytes for the poly key, we process six blocks
-	VMOVDQA AA0, AA1; VMOVDQA BB0, BB1; VMOVDQA CC0, CC1; VPADDD ·avx2IncMask<>(SB), DD0, DD1
-	VMOVDQA AA0, AA2; VMOVDQA BB0, BB2; VMOVDQA CC0, CC2; VPADDD ·avx2IncMask<>(SB), DD1, DD2
-	VMOVDQA BB0, TT1; VMOVDQA CC0, TT2; VMOVDQA DD0, TT3
-	MOVQ    $10, itr2
+	VMOVDQA Y0, Y5
+	VMOVDQA Y14, Y9
+	VMOVDQA Y12, Y13
+	VPADDD  ·avx2IncMask<>+0(SB), Y4, Y1
+	VMOVDQA Y0, Y6
+	VMOVDQA Y14, Y10
+	VMOVDQA Y12, Y8
+	VPADDD  ·avx2IncMask<>+0(SB), Y1, Y2
+	VMOVDQA Y14, Y7
+	VMOVDQA Y12, Y11
+	VMOVDQA Y4, Y15
+	MOVQ    $0x0000000a, R9
 
 openAVX2320InnerCipherLoop:
-	chachaQR_AVX2(AA0, BB0, CC0, DD0, TT0); chachaQR_AVX2(AA1, BB1, CC1, DD1, TT0); chachaQR_AVX2(AA2, BB2, CC2, DD2, TT0)
-	VPALIGNR $4, BB0, BB0, BB0; VPALIGNR $4, BB1, BB1, BB1; VPALIGNR $4, BB2, BB2, BB2
-	VPALIGNR $8, CC0, CC0, CC0; VPALIGNR $8, CC1, CC1, CC1; VPALIGNR $8, CC2, CC2, CC2
-	VPALIGNR $12, DD0, DD0, DD0; VPALIGNR $12, DD1, DD1, DD1; VPALIGNR $12, DD2, DD2, DD2
-	chachaQR_AVX2(AA0, BB0, CC0, DD0, TT0); chachaQR_AVX2(AA1, BB1, CC1, DD1, TT0); chachaQR_AVX2(AA2, BB2, CC2, DD2, TT0)
-	VPALIGNR $12, BB0, BB0, BB0; VPALIGNR $12, BB1, BB1, BB1; VPALIGNR $12, BB2, BB2, BB2
-	VPALIGNR $8, CC0, CC0, CC0; VPALIGNR $8, CC1, CC1, CC1; VPALIGNR $8, CC2, CC2, CC2
-	VPALIGNR $4, DD0, DD0, DD0; VPALIGNR $4, DD1, DD1, DD1; VPALIGNR $4, DD2, DD2, DD2
-	DECQ     itr2
+	VPADDD   Y14, Y0, Y0
+	VPXOR    Y0, Y4, Y4
+	VPSHUFB  ·rol16<>+0(SB), Y4, Y4
+	VPADDD   Y4, Y12, Y12
+	VPXOR    Y12, Y14, Y14
+	VPSLLD   $0x0c, Y14, Y3
+	VPSRLD   $0x14, Y14, Y14
+	VPXOR    Y3, Y14, Y14
+	VPADDD   Y14, Y0, Y0
+	VPXOR    Y0, Y4, Y4
+	VPSHUFB  ·rol8<>+0(SB), Y4, Y4
+	VPADDD   Y4, Y12, Y12
+	VPXOR    Y12, Y14, Y14
+	VPSLLD   $0x07, Y14, Y3
+	VPSRLD   $0x19, Y14, Y14
+	VPXOR    Y3, Y14, Y14
+	VPADDD   Y9, Y5, Y5
+	VPXOR    Y5, Y1, Y1
+	VPSHUFB  ·rol16<>+0(SB), Y1, Y1
+	VPADDD   Y1, Y13, Y13
+	VPXOR    Y13, Y9, Y9
+	VPSLLD   $0x0c, Y9, Y3
+	VPSRLD   $0x14, Y9, Y9
+	VPXOR    Y3, Y9, Y9
+	VPADDD   Y9, Y5, Y5
+	VPXOR    Y5, Y1, Y1
+	VPSHUFB  ·rol8<>+0(SB), Y1, Y1
+	VPADDD   Y1, Y13, Y13
+	VPXOR    Y13, Y9, Y9
+	VPSLLD   $0x07, Y9, Y3
+	VPSRLD   $0x19, Y9, Y9
+	VPXOR    Y3, Y9, Y9
+	VPADDD   Y10, Y6, Y6
+	VPXOR    Y6, Y2, Y2
+	VPSHUFB  ·rol16<>+0(SB), Y2, Y2
+	VPADDD   Y2, Y8, Y8
+	VPXOR    Y8, Y10, Y10
+	VPSLLD   $0x0c, Y10, Y3
+	VPSRLD   $0x14, Y10, Y10
+	VPXOR    Y3, Y10, Y10
+	VPADDD   Y10, Y6, Y6
+	VPXOR    Y6, Y2, Y2
+	VPSHUFB  ·rol8<>+0(SB), Y2, Y2
+	VPADDD   Y2, Y8, Y8
+	VPXOR    Y8, Y10, Y10
+	VPSLLD   $0x07, Y10, Y3
+	VPSRLD   $0x19, Y10, Y10
+	VPXOR    Y3, Y10, Y10
+	VPALIGNR $0x04, Y14, Y14, Y14
+	VPALIGNR $0x04, Y9, Y9, Y9
+	VPALIGNR $0x04, Y10, Y10, Y10
+	VPALIGNR $0x08, Y12, Y12, Y12
+	VPALIGNR $0x08, Y13, Y13, Y13
+	VPALIGNR $0x08, Y8, Y8, Y8
+	VPALIGNR $0x0c, Y4, Y4, Y4
+	VPALIGNR $0x0c, Y1, Y1, Y1
+	VPALIGNR $0x0c, Y2, Y2, Y2
+	VPADDD   Y14, Y0, Y0
+	VPXOR    Y0, Y4, Y4
+	VPSHUFB  ·rol16<>+0(SB), Y4, Y4
+	VPADDD   Y4, Y12, Y12
+	VPXOR    Y12, Y14, Y14
+	VPSLLD   $0x0c, Y14, Y3
+	VPSRLD   $0x14, Y14, Y14
+	VPXOR    Y3, Y14, Y14
+	VPADDD   Y14, Y0, Y0
+	VPXOR    Y0, Y4, Y4
+	VPSHUFB  ·rol8<>+0(SB), Y4, Y4
+	VPADDD   Y4, Y12, Y12
+	VPXOR    Y12, Y14, Y14
+	VPSLLD   $0x07, Y14, Y3
+	VPSRLD   $0x19, Y14, Y14
+	VPXOR    Y3, Y14, Y14
+	VPADDD   Y9, Y5, Y5
+	VPXOR    Y5, Y1, Y1
+	VPSHUFB  ·rol16<>+0(SB), Y1, Y1
+	VPADDD   Y1, Y13, Y13
+	VPXOR    Y13, Y9, Y9
+	VPSLLD   $0x0c, Y9, Y3
+	VPSRLD   $0x14, Y9, Y9
+	VPXOR    Y3, Y9, Y9
+	VPADDD   Y9, Y5, Y5
+	VPXOR    Y5, Y1, Y1
+	VPSHUFB  ·rol8<>+0(SB), Y1, Y1
+	VPADDD   Y1, Y13, Y13
+	VPXOR    Y13, Y9, Y9
+	VPSLLD   $0x07, Y9, Y3
+	VPSRLD   $0x19, Y9, Y9
+	VPXOR    Y3, Y9, Y9
+	VPADDD   Y10, Y6, Y6
+	VPXOR    Y6, Y2, Y2
+	VPSHUFB  ·rol16<>+0(SB), Y2, Y2
+	VPADDD   Y2, Y8, Y8
+	VPXOR    Y8, Y10, Y10
+	VPSLLD   $0x0c, Y10, Y3
+	VPSRLD   $0x14, Y10, Y10
+	VPXOR    Y3, Y10, Y10
+	VPADDD   Y10, Y6, Y6
+	VPXOR    Y6, Y2, Y2
+	VPSHUFB  ·rol8<>+0(SB), Y2, Y2
+	VPADDD   Y2, Y8, Y8
+	VPXOR    Y8, Y10, Y10
+	VPSLLD   $0x07, Y10, Y3
+	VPSRLD   $0x19, Y10, Y10
+	VPXOR    Y3, Y10, Y10
+	VPALIGNR $0x0c, Y14, Y14, Y14
+	VPALIGNR $0x0c, Y9, Y9, Y9
+	VPALIGNR $0x0c, Y10, Y10, Y10
+	VPALIGNR $0x08, Y12, Y12, Y12
+	VPALIGNR $0x08, Y13, Y13, Y13
+	VPALIGNR $0x08, Y8, Y8, Y8
+	VPALIGNR $0x04, Y4, Y4, Y4
+	VPALIGNR $0x04, Y1, Y1, Y1
+	VPALIGNR $0x04, Y2, Y2, Y2
+	DECQ     R9
 	JNE      openAVX2320InnerCipherLoop
-
-	VMOVDQA ·chacha20Constants<>(SB), TT0
-	VPADDD  TT0, AA0, AA0; VPADDD TT0, AA1, AA1; VPADDD TT0, AA2, AA2
-	VPADDD  TT1, BB0, BB0; VPADDD TT1, BB1, BB1; VPADDD TT1, BB2, BB2
-	VPADDD  TT2, CC0, CC0; VPADDD TT2, CC1, CC1; VPADDD TT2, CC2, CC2
-	VMOVDQA ·avx2IncMask<>(SB), TT0
-	VPADDD  TT3, DD0, DD0; VPADDD TT0, TT3, TT3
-	VPADDD  TT3, DD1, DD1; VPADDD TT0, TT3, TT3
-	VPADDD  TT3, DD2, DD2
+	VMOVDQA  ·chacha20Constants<>+0(SB), Y3
+	VPADDD   Y3, Y0, Y0
+	VPADDD   Y3, Y5, Y5
+	VPADDD   Y3, Y6, Y6
+	VPADDD   Y7, Y14, Y14
+	VPADDD   Y7, Y9, Y9
+	VPADDD   Y7, Y10, Y10
+	VPADDD   Y11, Y12, Y12
+	VPADDD   Y11, Y13, Y13
+	VPADDD   Y11, Y8, Y8
+	VMOVDQA  ·avx2IncMask<>+0(SB), Y3
+	VPADDD   Y15, Y4, Y4
+	VPADDD   Y3, Y15, Y15
+	VPADDD   Y15, Y1, Y1
+	VPADDD   Y3, Y15, Y15
+	VPADDD   Y15, Y2, Y2
 
 	// Clamp and store poly key
-	VPERM2I128 $0x02, AA0, BB0, TT0
-	VPAND      ·polyClampMask<>(SB), TT0, TT0
-	VMOVDQA    TT0, rsStoreAVX2
+	VPERM2I128 $0x02, Y0, Y14, Y3
+	VPAND      ·polyClampMask<>+0(SB), Y3, Y3
+	VMOVDQA    Y3, (BP)
 
 	// Stream for up to 320 bytes
-	VPERM2I128 $0x13, AA0, BB0, AA0
-	VPERM2I128 $0x13, CC0, DD0, BB0
-	VPERM2I128 $0x02, AA1, BB1, CC0
-	VPERM2I128 $0x02, CC1, DD1, DD0
-	VPERM2I128 $0x13, AA1, BB1, AA1
-	VPERM2I128 $0x13, CC1, DD1, BB1
-	VPERM2I128 $0x02, AA2, BB2, CC1
-	VPERM2I128 $0x02, CC2, DD2, DD1
-	VPERM2I128 $0x13, AA2, BB2, AA2
-	VPERM2I128 $0x13, CC2, DD2, BB2
+	VPERM2I128 $0x13, Y0, Y14, Y0
+	VPERM2I128 $0x13, Y12, Y4, Y14
+	VPERM2I128 $0x02, Y5, Y9, Y12
+	VPERM2I128 $0x02, Y13, Y1, Y4
+	VPERM2I128 $0x13, Y5, Y9, Y5
+	VPERM2I128 $0x13, Y13, Y1, Y9
+	VPERM2I128 $0x02, Y6, Y10, Y13
+	VPERM2I128 $0x02, Y8, Y2, Y1
+	VPERM2I128 $0x13, Y6, Y10, Y6
+	VPERM2I128 $0x13, Y8, Y2, Y10
 	JMP        openAVX2ShortOpen
 
-// ----------------------------------------------------------------------------
-// Special optimization for the last 128 bytes of ciphertext
 openAVX2Tail128:
 	// Need to decrypt up to 128 bytes - prepare two blocks
-	VMOVDQA ·chacha20Constants<>(SB), AA1
-	VMOVDQA state1StoreAVX2, BB1
-	VMOVDQA state2StoreAVX2, CC1
-	VMOVDQA ctr3StoreAVX2, DD1
-	VPADDD  ·avx2IncMask<>(SB), DD1, DD1
-	VMOVDQA DD1, DD0
-
-	XORQ  itr2, itr2
-	MOVQ  inl, itr1
-	ANDQ  $-16, itr1
-	TESTQ itr1, itr1
-	JE    openAVX2Tail128LoopB
+	VMOVDQA ·chacha20Constants<>+0(SB), Y5
+	VMOVDQA 32(BP), Y9
+	VMOVDQA 64(BP), Y13
+	VMOVDQA 192(BP), Y1
+	VPADDD  ·avx2IncMask<>+0(SB), Y1, Y1
+	VMOVDQA Y1, Y4
+	XORQ    R9, R9
+	MOVQ    BX, CX
+	ANDQ    $-16, CX
+	TESTQ   CX, CX
+	JE      openAVX2Tail128LoopB
 
 openAVX2Tail128LoopA:
-	// Perform ChaCha rounds, while hashing the remaining input
-	polyAdd(0(inp)(itr2*1))
-	polyMulAVX2
+	ADDQ  (SI)(R9*1), R10
+	ADCQ  8(SI)(R9*1), R11
+	ADCQ  $0x01, R12
+	MOVQ  (BP), DX
+	MOVQ  DX, R15
+	MULXQ R10, R13, R14
+	IMULQ R12, R15
+	MULXQ R11, AX, DX
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), DX
+	MULXQ R10, R10, AX
+	ADDQ  R10, R14
+	MULXQ R11, R11, R8
+	ADCQ  R11, R15
+	ADCQ  $0x00, R8
+	IMULQ R12, DX
+	ADDQ  AX, R15
+	ADCQ  DX, R8
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
 
 openAVX2Tail128LoopB:
-	ADDQ     $16, itr2
-	chachaQR_AVX2(AA1, BB1, CC1, DD1, TT0)
-	VPALIGNR $4, BB1, BB1, BB1
-	VPALIGNR $8, CC1, CC1, CC1
-	VPALIGNR $12, DD1, DD1, DD1
-	chachaQR_AVX2(AA1, BB1, CC1, DD1, TT0)
-	VPALIGNR $12, BB1, BB1, BB1
-	VPALIGNR $8, CC1, CC1, CC1
-	VPALIGNR $4, DD1, DD1, DD1
-	CMPQ     itr2, itr1
-	JB       openAVX2Tail128LoopA
-	CMPQ     itr2, $160
-	JNE      openAVX2Tail128LoopB
-
-	VPADDD     ·chacha20Constants<>(SB), AA1, AA1
-	VPADDD     state1StoreAVX2, BB1, BB1
-	VPADDD     state2StoreAVX2, CC1, CC1
-	VPADDD     DD0, DD1, DD1
-	VPERM2I128 $0x02, AA1, BB1, AA0; VPERM2I128 $0x02, CC1, DD1, BB0; VPERM2I128 $0x13, AA1, BB1, CC0; VPERM2I128 $0x13, CC1, DD1, DD0
+	ADDQ       $0x10, R9
+	VPADDD     Y9, Y5, Y5
+	VPXOR      Y5, Y1, Y1
+	VPSHUFB    ·rol16<>+0(SB), Y1, Y1
+	VPADDD     Y1, Y13, Y13
+	VPXOR      Y13, Y9, Y9
+	VPSLLD     $0x0c, Y9, Y3
+	VPSRLD     $0x14, Y9, Y9
+	VPXOR      Y3, Y9, Y9
+	VPADDD     Y9, Y5, Y5
+	VPXOR      Y5, Y1, Y1
+	VPSHUFB    ·rol8<>+0(SB), Y1, Y1
+	VPADDD     Y1, Y13, Y13
+	VPXOR      Y13, Y9, Y9
+	VPSLLD     $0x07, Y9, Y3
+	VPSRLD     $0x19, Y9, Y9
+	VPXOR      Y3, Y9, Y9
+	VPALIGNR   $0x04, Y9, Y9, Y9
+	VPALIGNR   $0x08, Y13, Y13, Y13
+	VPALIGNR   $0x0c, Y1, Y1, Y1
+	VPADDD     Y9, Y5, Y5
+	VPXOR      Y5, Y1, Y1
+	VPSHUFB    ·rol16<>+0(SB), Y1, Y1
+	VPADDD     Y1, Y13, Y13
+	VPXOR      Y13, Y9, Y9
+	VPSLLD     $0x0c, Y9, Y3
+	VPSRLD     $0x14, Y9, Y9
+	VPXOR      Y3, Y9, Y9
+	VPADDD     Y9, Y5, Y5
+	VPXOR      Y5, Y1, Y1
+	VPSHUFB    ·rol8<>+0(SB), Y1, Y1
+	VPADDD     Y1, Y13, Y13
+	VPXOR      Y13, Y9, Y9
+	VPSLLD     $0x07, Y9, Y3
+	VPSRLD     $0x19, Y9, Y9
+	VPXOR      Y3, Y9, Y9
+	VPALIGNR   $0x0c, Y9, Y9, Y9
+	VPALIGNR   $0x08, Y13, Y13, Y13
+	VPALIGNR   $0x04, Y1, Y1, Y1
+	CMPQ       R9, CX
+	JB         openAVX2Tail128LoopA
+	CMPQ       R9, $0xa0
+	JNE        openAVX2Tail128LoopB
+	VPADDD     ·chacha20Constants<>+0(SB), Y5, Y5
+	VPADDD     32(BP), Y9, Y9
+	VPADDD     64(BP), Y13, Y13
+	VPADDD     Y4, Y1, Y1
+	VPERM2I128 $0x02, Y5, Y9, Y0
+	VPERM2I128 $0x02, Y13, Y1, Y14
+	VPERM2I128 $0x13, Y5, Y9, Y12
+	VPERM2I128 $0x13, Y13, Y1, Y4
 
 openAVX2TailLoop:
-	CMPQ inl, $32
+	CMPQ BX, $0x20
 	JB   openAVX2Tail
-	SUBQ $32, inl
+	SUBQ $0x20, BX
 
 	// Load for decryption
-	VPXOR   (inp), AA0, AA0
-	VMOVDQU AA0, (oup)
-	LEAQ    (1*32)(inp), inp
-	LEAQ    (1*32)(oup), oup
-	VMOVDQA BB0, AA0
-	VMOVDQA CC0, BB0
-	VMOVDQA DD0, CC0
+	VPXOR   (SI), Y0, Y0
+	VMOVDQU Y0, (DI)
+	LEAQ    32(SI), SI
+	LEAQ    32(DI), DI
+	VMOVDQA Y14, Y0
+	VMOVDQA Y12, Y14
+	VMOVDQA Y4, Y12
 	JMP     openAVX2TailLoop
 
 openAVX2Tail:
-	CMPQ    inl, $16
-	VMOVDQA A0, A1
+	CMPQ    BX, $0x10
+	VMOVDQA X0, X1
 	JB      openAVX2TailDone
-	SUBQ    $16, inl
+	SUBQ    $0x10, BX
 
 	// Load for decryption
-	VPXOR      (inp), A0, T0
-	VMOVDQU    T0, (oup)
-	LEAQ       (1*16)(inp), inp
-	LEAQ       (1*16)(oup), oup
-	VPERM2I128 $0x11, AA0, AA0, AA0
-	VMOVDQA    A0, A1
+	VPXOR      (SI), X0, X12
+	VMOVDQU    X12, (DI)
+	LEAQ       16(SI), SI
+	LEAQ       16(DI), DI
+	VPERM2I128 $0x11, Y0, Y0, Y0
+	VMOVDQA    X0, X1
 
 openAVX2TailDone:
 	VZEROUPPER
 	JMP openSSETail16
 
-// ----------------------------------------------------------------------------
-// Special optimization for the last 256 bytes of ciphertext
 openAVX2Tail256:
-	// Need to decrypt up to 256 bytes - prepare four blocks
-	VMOVDQA ·chacha20Constants<>(SB), AA0; VMOVDQA AA0, AA1
-	VMOVDQA state1StoreAVX2, BB0; VMOVDQA BB0, BB1
-	VMOVDQA state2StoreAVX2, CC0; VMOVDQA CC0, CC1
-	VMOVDQA ctr3StoreAVX2, DD0
-	VPADDD  ·avx2IncMask<>(SB), DD0, DD0
-	VPADDD  ·avx2IncMask<>(SB), DD0, DD1
-	VMOVDQA DD0, TT1
-	VMOVDQA DD1, TT2
+	VMOVDQA ·chacha20Constants<>+0(SB), Y0
+	VMOVDQA Y0, Y5
+	VMOVDQA 32(BP), Y14
+	VMOVDQA Y14, Y9
+	VMOVDQA 64(BP), Y12
+	VMOVDQA Y12, Y13
+	VMOVDQA 192(BP), Y4
+	VPADDD  ·avx2IncMask<>+0(SB), Y4, Y4
+	VPADDD  ·avx2IncMask<>+0(SB), Y4, Y1
+	VMOVDQA Y4, Y7
+	VMOVDQA Y1, Y11
 
 	// Compute the number of iterations that will hash data
-	MOVQ    inl, tmpStoreAVX2
-	MOVQ    inl, itr1
-	SUBQ    $128, itr1
-	SHRQ    $4, itr1
-	MOVQ    $10, itr2
-	CMPQ    itr1, $10
-	CMOVQGT itr2, itr1
-	MOVQ    inp, inl
-	XORQ    itr2, itr2
+	MOVQ    BX, 224(BP)
+	MOVQ    BX, CX
+	SUBQ    $0x80, CX
+	SHRQ    $0x04, CX
+	MOVQ    $0x0000000a, R9
+	CMPQ    CX, $0x0a
+	CMOVQGT R9, CX
+	MOVQ    SI, BX
+	XORQ    R9, R9
 
 openAVX2Tail256LoopA:
-	polyAdd(0(inl))
-	polyMulAVX2
-	LEAQ 16(inl), inl
+	ADDQ  (BX), R10
+	ADCQ  8(BX), R11
+	ADCQ  $0x01, R12
+	MOVQ  (BP), DX
+	MOVQ  DX, R15
+	MULXQ R10, R13, R14
+	IMULQ R12, R15
+	MULXQ R11, AX, DX
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), DX
+	MULXQ R10, R10, AX
+	ADDQ  R10, R14
+	MULXQ R11, R11, R8
+	ADCQ  R11, R15
+	ADCQ  $0x00, R8
+	IMULQ R12, DX
+	ADDQ  AX, R15
+	ADCQ  DX, R8
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
+	LEAQ  16(BX), BX
 
-	// Perform ChaCha rounds, while hashing the remaining input
 openAVX2Tail256LoopB:
-	chachaQR_AVX2(AA0, BB0, CC0, DD0, TT0); chachaQR_AVX2(AA1, BB1, CC1, DD1, TT0)
-	VPALIGNR $4, BB0, BB0, BB0; VPALIGNR $4, BB1, BB1, BB1
-	VPALIGNR $8, CC0, CC0, CC0; VPALIGNR $8, CC1, CC1, CC1
-	VPALIGNR $12, DD0, DD0, DD0; VPALIGNR $12, DD1, DD1, DD1
-	INCQ     itr2
-	chachaQR_AVX2(AA0, BB0, CC0, DD0, TT0); chachaQR_AVX2(AA1, BB1, CC1, DD1, TT0)
-	VPALIGNR $12, BB0, BB0, BB0; VPALIGNR $12, BB1, BB1, BB1
-	VPALIGNR $8, CC0, CC0, CC0; VPALIGNR $8, CC1, CC1, CC1
-	VPALIGNR $4, DD0, DD0, DD0; VPALIGNR $4, DD1, DD1, DD1
-	CMPQ     itr2, itr1
+	VPADDD   Y14, Y0, Y0
+	VPXOR    Y0, Y4, Y4
+	VPSHUFB  ·rol16<>+0(SB), Y4, Y4
+	VPADDD   Y4, Y12, Y12
+	VPXOR    Y12, Y14, Y14
+	VPSLLD   $0x0c, Y14, Y3
+	VPSRLD   $0x14, Y14, Y14
+	VPXOR    Y3, Y14, Y14
+	VPADDD   Y14, Y0, Y0
+	VPXOR    Y0, Y4, Y4
+	VPSHUFB  ·rol8<>+0(SB), Y4, Y4
+	VPADDD   Y4, Y12, Y12
+	VPXOR    Y12, Y14, Y14
+	VPSLLD   $0x07, Y14, Y3
+	VPSRLD   $0x19, Y14, Y14
+	VPXOR    Y3, Y14, Y14
+	VPADDD   Y9, Y5, Y5
+	VPXOR    Y5, Y1, Y1
+	VPSHUFB  ·rol16<>+0(SB), Y1, Y1
+	VPADDD   Y1, Y13, Y13
+	VPXOR    Y13, Y9, Y9
+	VPSLLD   $0x0c, Y9, Y3
+	VPSRLD   $0x14, Y9, Y9
+	VPXOR    Y3, Y9, Y9
+	VPADDD   Y9, Y5, Y5
+	VPXOR    Y5, Y1, Y1
+	VPSHUFB  ·rol8<>+0(SB), Y1, Y1
+	VPADDD   Y1, Y13, Y13
+	VPXOR    Y13, Y9, Y9
+	VPSLLD   $0x07, Y9, Y3
+	VPSRLD   $0x19, Y9, Y9
+	VPXOR    Y3, Y9, Y9
+	VPALIGNR $0x04, Y14, Y14, Y14
+	VPALIGNR $0x04, Y9, Y9, Y9
+	VPALIGNR $0x08, Y12, Y12, Y12
+	VPALIGNR $0x08, Y13, Y13, Y13
+	VPALIGNR $0x0c, Y4, Y4, Y4
+	VPALIGNR $0x0c, Y1, Y1, Y1
+	INCQ     R9
+	VPADDD   Y14, Y0, Y0
+	VPXOR    Y0, Y4, Y4
+	VPSHUFB  ·rol16<>+0(SB), Y4, Y4
+	VPADDD   Y4, Y12, Y12
+	VPXOR    Y12, Y14, Y14
+	VPSLLD   $0x0c, Y14, Y3
+	VPSRLD   $0x14, Y14, Y14
+	VPXOR    Y3, Y14, Y14
+	VPADDD   Y14, Y0, Y0
+	VPXOR    Y0, Y4, Y4
+	VPSHUFB  ·rol8<>+0(SB), Y4, Y4
+	VPADDD   Y4, Y12, Y12
+	VPXOR    Y12, Y14, Y14
+	VPSLLD   $0x07, Y14, Y3
+	VPSRLD   $0x19, Y14, Y14
+	VPXOR    Y3, Y14, Y14
+	VPADDD   Y9, Y5, Y5
+	VPXOR    Y5, Y1, Y1
+	VPSHUFB  ·rol16<>+0(SB), Y1, Y1
+	VPADDD   Y1, Y13, Y13
+	VPXOR    Y13, Y9, Y9
+	VPSLLD   $0x0c, Y9, Y3
+	VPSRLD   $0x14, Y9, Y9
+	VPXOR    Y3, Y9, Y9
+	VPADDD   Y9, Y5, Y5
+	VPXOR    Y5, Y1, Y1
+	VPSHUFB  ·rol8<>+0(SB), Y1, Y1
+	VPADDD   Y1, Y13, Y13
+	VPXOR    Y13, Y9, Y9
+	VPSLLD   $0x07, Y9, Y3
+	VPSRLD   $0x19, Y9, Y9
+	VPXOR    Y3, Y9, Y9
+	VPALIGNR $0x0c, Y14, Y14, Y14
+	VPALIGNR $0x0c, Y9, Y9, Y9
+	VPALIGNR $0x08, Y12, Y12, Y12
+	VPALIGNR $0x08, Y13, Y13, Y13
+	VPALIGNR $0x04, Y4, Y4, Y4
+	VPALIGNR $0x04, Y1, Y1, Y1
+	CMPQ     R9, CX
 	JB       openAVX2Tail256LoopA
+	CMPQ     R9, $0x0a
+	JNE      openAVX2Tail256LoopB
+	MOVQ     BX, R9
+	SUBQ     SI, BX
+	MOVQ     BX, CX
+	MOVQ     224(BP), BX
 
-	CMPQ itr2, $10
-	JNE  openAVX2Tail256LoopB
-
-	MOVQ inl, itr2
-	SUBQ inp, inl
-	MOVQ inl, itr1
-	MOVQ tmpStoreAVX2, inl
-
-	// Hash the remainder of data (if any)
 openAVX2Tail256Hash:
-	ADDQ $16, itr1
-	CMPQ itr1, inl
-	JGT  openAVX2Tail256HashEnd
-	polyAdd (0(itr2))
-	polyMulAVX2
-	LEAQ 16(itr2), itr2
-	JMP  openAVX2Tail256Hash
+	ADDQ  $0x10, CX
+	CMPQ  CX, BX
+	JGT   openAVX2Tail256HashEnd
+	ADDQ  (R9), R10
+	ADCQ  8(R9), R11
+	ADCQ  $0x01, R12
+	MOVQ  (BP), DX
+	MOVQ  DX, R15
+	MULXQ R10, R13, R14
+	IMULQ R12, R15
+	MULXQ R11, AX, DX
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), DX
+	MULXQ R10, R10, AX
+	ADDQ  R10, R14
+	MULXQ R11, R11, R8
+	ADCQ  R11, R15
+	ADCQ  $0x00, R8
+	IMULQ R12, DX
+	ADDQ  AX, R15
+	ADCQ  DX, R8
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
+	LEAQ  16(R9), R9
+	JMP   openAVX2Tail256Hash
 
-// Store 128 bytes safely, then go to store loop
 openAVX2Tail256HashEnd:
-	VPADDD     ·chacha20Constants<>(SB), AA0, AA0; VPADDD ·chacha20Constants<>(SB), AA1, AA1
-	VPADDD     state1StoreAVX2, BB0, BB0; VPADDD state1StoreAVX2, BB1, BB1
-	VPADDD     state2StoreAVX2, CC0, CC0; VPADDD state2StoreAVX2, CC1, CC1
-	VPADDD     TT1, DD0, DD0; VPADDD TT2, DD1, DD1
-	VPERM2I128 $0x02, AA0, BB0, AA2; VPERM2I128 $0x02, CC0, DD0, BB2; VPERM2I128 $0x13, AA0, BB0, CC2; VPERM2I128 $0x13, CC0, DD0, DD2
-	VPERM2I128 $0x02, AA1, BB1, AA0; VPERM2I128 $0x02, CC1, DD1, BB0; VPERM2I128 $0x13, AA1, BB1, CC0; VPERM2I128 $0x13, CC1, DD1, DD0
-
-	VPXOR   (0*32)(inp), AA2, AA2; VPXOR (1*32)(inp), BB2, BB2; VPXOR (2*32)(inp), CC2, CC2; VPXOR (3*32)(inp), DD2, DD2
-	VMOVDQU AA2, (0*32)(oup); VMOVDQU BB2, (1*32)(oup); VMOVDQU CC2, (2*32)(oup); VMOVDQU DD2, (3*32)(oup)
-	LEAQ    (4*32)(inp), inp
-	LEAQ    (4*32)(oup), oup
-	SUBQ    $4*32, inl
-
-	JMP openAVX2TailLoop
-
-// ----------------------------------------------------------------------------
-// Special optimization for the last 384 bytes of ciphertext
-openAVX2Tail384:
-	// Need to decrypt up to 384 bytes - prepare six blocks
-	VMOVDQA ·chacha20Constants<>(SB), AA0; VMOVDQA AA0, AA1; VMOVDQA AA0, AA2
-	VMOVDQA state1StoreAVX2, BB0; VMOVDQA BB0, BB1; VMOVDQA BB0, BB2
-	VMOVDQA state2StoreAVX2, CC0; VMOVDQA CC0, CC1; VMOVDQA CC0, CC2
-	VMOVDQA ctr3StoreAVX2, DD0
-	VPADDD  ·avx2IncMask<>(SB), DD0, DD0
-	VPADDD  ·avx2IncMask<>(SB), DD0, DD1
-	VPADDD  ·avx2IncMask<>(SB), DD1, DD2
-	VMOVDQA DD0, ctr0StoreAVX2
-	VMOVDQA DD1, ctr1StoreAVX2
-	VMOVDQA DD2, ctr2StoreAVX2
-
-	// Compute the number of iterations that will hash two blocks of data
-	MOVQ    inl, tmpStoreAVX2
-	MOVQ    inl, itr1
-	SUBQ    $256, itr1
-	SHRQ    $4, itr1
-	ADDQ    $6, itr1
-	MOVQ    $10, itr2
-	CMPQ    itr1, $10
-	CMOVQGT itr2, itr1
-	MOVQ    inp, inl
-	XORQ    itr2, itr2
-
-	// Perform ChaCha rounds, while hashing the remaining input
-openAVX2Tail384LoopB:
-	polyAdd(0(inl))
-	polyMulAVX2
-	LEAQ 16(inl), inl
-
-openAVX2Tail384LoopA:
-	chachaQR_AVX2(AA0, BB0, CC0, DD0, TT0); chachaQR_AVX2(AA1, BB1, CC1, DD1, TT0); chachaQR_AVX2(AA2, BB2, CC2, DD2, TT0)
-	VPALIGNR $4, BB0, BB0, BB0; VPALIGNR $4, BB1, BB1, BB1; VPALIGNR $4, BB2, BB2, BB2
-	VPALIGNR $8, CC0, CC0, CC0; VPALIGNR $8, CC1, CC1, CC1; VPALIGNR $8, CC2, CC2, CC2
-	VPALIGNR $12, DD0, DD0, DD0; VPALIGNR $12, DD1, DD1, DD1; VPALIGNR $12, DD2, DD2, DD2
-	polyAdd(0(inl))
-	polyMulAVX2
-	LEAQ     16(inl), inl
-	INCQ     itr2
-	chachaQR_AVX2(AA0, BB0, CC0, DD0, TT0); chachaQR_AVX2(AA1, BB1, CC1, DD1, TT0); chachaQR_AVX2(AA2, BB2, CC2, DD2, TT0)
-	VPALIGNR $12, BB0, BB0, BB0; VPALIGNR $12, BB1, BB1, BB1; VPALIGNR $12, BB2, BB2, BB2
-	VPALIGNR $8, CC0, CC0, CC0; VPALIGNR $8, CC1, CC1, CC1; VPALIGNR $8, CC2, CC2, CC2
-	VPALIGNR $4, DD0, DD0, DD0; VPALIGNR $4, DD1, DD1, DD1; VPALIGNR $4, DD2, DD2, DD2
-
-	CMPQ itr2, itr1
-	JB   openAVX2Tail384LoopB
-
-	CMPQ itr2, $10
-	JNE  openAVX2Tail384LoopA
-
-	MOVQ inl, itr2
-	SUBQ inp, inl
-	MOVQ inl, itr1
-	MOVQ tmpStoreAVX2, inl
-
-openAVX2Tail384Hash:
-	ADDQ $16, itr1
-	CMPQ itr1, inl
-	JGT  openAVX2Tail384HashEnd
-	polyAdd(0(itr2))
-	polyMulAVX2
-	LEAQ 16(itr2), itr2
-	JMP  openAVX2Tail384Hash
-
-// Store 256 bytes safely, then go to store loop
-openAVX2Tail384HashEnd:
-	VPADDD     ·chacha20Constants<>(SB), AA0, AA0; VPADDD ·chacha20Constants<>(SB), AA1, AA1; VPADDD ·chacha20Constants<>(SB), AA2, AA2
-	VPADDD     state1StoreAVX2, BB0, BB0; VPADDD state1StoreAVX2, BB1, BB1; VPADDD state1StoreAVX2, BB2, BB2
-	VPADDD     state2StoreAVX2, CC0, CC0; VPADDD state2StoreAVX2, CC1, CC1; VPADDD state2StoreAVX2, CC2, CC2
-	VPADDD     ctr0StoreAVX2, DD0, DD0; VPADDD ctr1StoreAVX2, DD1, DD1; VPADDD ctr2StoreAVX2, DD2, DD2
-	VPERM2I128 $0x02, AA0, BB0, TT0; VPERM2I128 $0x02, CC0, DD0, TT1; VPERM2I128 $0x13, AA0, BB0, TT2; VPERM2I128 $0x13, CC0, DD0, TT3
-	VPXOR      (0*32)(inp), TT0, TT0; VPXOR (1*32)(inp), TT1, TT1; VPXOR (2*32)(inp), TT2, TT2; VPXOR (3*32)(inp), TT3, TT3
-	VMOVDQU    TT0, (0*32)(oup); VMOVDQU TT1, (1*32)(oup); VMOVDQU TT2, (2*32)(oup); VMOVDQU TT3, (3*32)(oup)
-	VPERM2I128 $0x02, AA1, BB1, TT0; VPERM2I128 $0x02, CC1, DD1, TT1; VPERM2I128 $0x13, AA1, BB1, TT2; VPERM2I128 $0x13, CC1, DD1, TT3
-	VPXOR      (4*32)(inp), TT0, TT0; VPXOR (5*32)(inp), TT1, TT1; VPXOR (6*32)(inp), TT2, TT2; VPXOR (7*32)(inp), TT3, TT3
-	VMOVDQU    TT0, (4*32)(oup); VMOVDQU TT1, (5*32)(oup); VMOVDQU TT2, (6*32)(oup); VMOVDQU TT3, (7*32)(oup)
-	VPERM2I128 $0x02, AA2, BB2, AA0; VPERM2I128 $0x02, CC2, DD2, BB0; VPERM2I128 $0x13, AA2, BB2, CC0; VPERM2I128 $0x13, CC2, DD2, DD0
-	LEAQ       (8*32)(inp), inp
-	LEAQ       (8*32)(oup), oup
-	SUBQ       $8*32, inl
+	VPADDD     ·chacha20Constants<>+0(SB), Y0, Y0
+	VPADDD     ·chacha20Constants<>+0(SB), Y5, Y5
+	VPADDD     32(BP), Y14, Y14
+	VPADDD     32(BP), Y9, Y9
+	VPADDD     64(BP), Y12, Y12
+	VPADDD     64(BP), Y13, Y13
+	VPADDD     Y7, Y4, Y4
+	VPADDD     Y11, Y1, Y1
+	VPERM2I128 $0x02, Y0, Y14, Y6
+	VPERM2I128 $0x02, Y12, Y4, Y10
+	VPERM2I128 $0x13, Y0, Y14, Y8
+	VPERM2I128 $0x13, Y12, Y4, Y2
+	VPERM2I128 $0x02, Y5, Y9, Y0
+	VPERM2I128 $0x02, Y13, Y1, Y14
+	VPERM2I128 $0x13, Y5, Y9, Y12
+	VPERM2I128 $0x13, Y13, Y1, Y4
+	VPXOR      (SI), Y6, Y6
+	VPXOR      32(SI), Y10, Y10
+	VPXOR      64(SI), Y8, Y8
+	VPXOR      96(SI), Y2, Y2
+	VMOVDQU    Y6, (DI)
+	VMOVDQU    Y10, 32(DI)
+	VMOVDQU    Y8, 64(DI)
+	VMOVDQU    Y2, 96(DI)
+	LEAQ       128(SI), SI
+	LEAQ       128(DI), DI
+	SUBQ       $0x80, BX
+	JMP        openAVX2TailLoop
+
+openAVX2Tail384:
+	// Need to decrypt up to 384 bytes - prepare six blocks
+	VMOVDQA ·chacha20Constants<>+0(SB), Y0
+	VMOVDQA Y0, Y5
+	VMOVDQA Y0, Y6
+	VMOVDQA 32(BP), Y14
+	VMOVDQA Y14, Y9
+	VMOVDQA Y14, Y10
+	VMOVDQA 64(BP), Y12
+	VMOVDQA Y12, Y13
+	VMOVDQA Y12, Y8
+	VMOVDQA 192(BP), Y4
+	VPADDD  ·avx2IncMask<>+0(SB), Y4, Y4
+	VPADDD  ·avx2IncMask<>+0(SB), Y4, Y1
+	VPADDD  ·avx2IncMask<>+0(SB), Y1, Y2
+	VMOVDQA Y4, 96(BP)
+	VMOVDQA Y1, 128(BP)
+	VMOVDQA Y2, 160(BP)
+
+	// Compute the number of iterations that will hash two blocks of data
+	MOVQ    BX, 224(BP)
+	MOVQ    BX, CX
+	SUBQ    $0x00000100, CX
+	SHRQ    $0x04, CX
+	ADDQ    $0x06, CX
+	MOVQ    $0x0000000a, R9
+	CMPQ    CX, $0x0a
+	CMOVQGT R9, CX
+	MOVQ    SI, BX
+	XORQ    R9, R9
+
+openAVX2Tail384LoopB:
+	ADDQ  (BX), R10
+	ADCQ  8(BX), R11
+	ADCQ  $0x01, R12
+	MOVQ  (BP), DX
+	MOVQ  DX, R15
+	MULXQ R10, R13, R14
+	IMULQ R12, R15
+	MULXQ R11, AX, DX
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), DX
+	MULXQ R10, R10, AX
+	ADDQ  R10, R14
+	MULXQ R11, R11, R8
+	ADCQ  R11, R15
+	ADCQ  $0x00, R8
+	IMULQ R12, DX
+	ADDQ  AX, R15
+	ADCQ  DX, R8
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
+	LEAQ  16(BX), BX
+
+openAVX2Tail384LoopA:
+	VPADDD   Y14, Y0, Y0
+	VPXOR    Y0, Y4, Y4
+	VPSHUFB  ·rol16<>+0(SB), Y4, Y4
+	VPADDD   Y4, Y12, Y12
+	VPXOR    Y12, Y14, Y14
+	VPSLLD   $0x0c, Y14, Y3
+	VPSRLD   $0x14, Y14, Y14
+	VPXOR    Y3, Y14, Y14
+	VPADDD   Y14, Y0, Y0
+	VPXOR    Y0, Y4, Y4
+	VPSHUFB  ·rol8<>+0(SB), Y4, Y4
+	VPADDD   Y4, Y12, Y12
+	VPXOR    Y12, Y14, Y14
+	VPSLLD   $0x07, Y14, Y3
+	VPSRLD   $0x19, Y14, Y14
+	VPXOR    Y3, Y14, Y14
+	VPADDD   Y9, Y5, Y5
+	VPXOR    Y5, Y1, Y1
+	VPSHUFB  ·rol16<>+0(SB), Y1, Y1
+	VPADDD   Y1, Y13, Y13
+	VPXOR    Y13, Y9, Y9
+	VPSLLD   $0x0c, Y9, Y3
+	VPSRLD   $0x14, Y9, Y9
+	VPXOR    Y3, Y9, Y9
+	VPADDD   Y9, Y5, Y5
+	VPXOR    Y5, Y1, Y1
+	VPSHUFB  ·rol8<>+0(SB), Y1, Y1
+	VPADDD   Y1, Y13, Y13
+	VPXOR    Y13, Y9, Y9
+	VPSLLD   $0x07, Y9, Y3
+	VPSRLD   $0x19, Y9, Y9
+	VPXOR    Y3, Y9, Y9
+	VPADDD   Y10, Y6, Y6
+	VPXOR    Y6, Y2, Y2
+	VPSHUFB  ·rol16<>+0(SB), Y2, Y2
+	VPADDD   Y2, Y8, Y8
+	VPXOR    Y8, Y10, Y10
+	VPSLLD   $0x0c, Y10, Y3
+	VPSRLD   $0x14, Y10, Y10
+	VPXOR    Y3, Y10, Y10
+	VPADDD   Y10, Y6, Y6
+	VPXOR    Y6, Y2, Y2
+	VPSHUFB  ·rol8<>+0(SB), Y2, Y2
+	VPADDD   Y2, Y8, Y8
+	VPXOR    Y8, Y10, Y10
+	VPSLLD   $0x07, Y10, Y3
+	VPSRLD   $0x19, Y10, Y10
+	VPXOR    Y3, Y10, Y10
+	VPALIGNR $0x04, Y14, Y14, Y14
+	VPALIGNR $0x04, Y9, Y9, Y9
+	VPALIGNR $0x04, Y10, Y10, Y10
+	VPALIGNR $0x08, Y12, Y12, Y12
+	VPALIGNR $0x08, Y13, Y13, Y13
+	VPALIGNR $0x08, Y8, Y8, Y8
+	VPALIGNR $0x0c, Y4, Y4, Y4
+	VPALIGNR $0x0c, Y1, Y1, Y1
+	VPALIGNR $0x0c, Y2, Y2, Y2
+	ADDQ     (BX), R10
+	ADCQ     8(BX), R11
+	ADCQ     $0x01, R12
+	MOVQ     (BP), DX
+	MOVQ     DX, R15
+	MULXQ    R10, R13, R14
+	IMULQ    R12, R15
+	MULXQ    R11, AX, DX
+	ADDQ     AX, R14
+	ADCQ     DX, R15
+	MOVQ     8(BP), DX
+	MULXQ    R10, R10, AX
+	ADDQ     R10, R14
+	MULXQ    R11, R11, R8
+	ADCQ     R11, R15
+	ADCQ     $0x00, R8
+	IMULQ    R12, DX
+	ADDQ     AX, R15
+	ADCQ     DX, R8
+	MOVQ     R13, R10
+	MOVQ     R14, R11
+	MOVQ     R15, R12
+	ANDQ     $0x03, R12
+	MOVQ     R15, R13
+	ANDQ     $-4, R13
+	MOVQ     R8, R14
+	SHRQ     $0x02, R8, R15
+	SHRQ     $0x02, R8
+	ADDQ     R13, R10
+	ADCQ     R14, R11
+	ADCQ     $0x00, R12
+	ADDQ     R15, R10
+	ADCQ     R8, R11
+	ADCQ     $0x00, R12
+	LEAQ     16(BX), BX
+	INCQ     R9
+	VPADDD   Y14, Y0, Y0
+	VPXOR    Y0, Y4, Y4
+	VPSHUFB  ·rol16<>+0(SB), Y4, Y4
+	VPADDD   Y4, Y12, Y12
+	VPXOR    Y12, Y14, Y14
+	VPSLLD   $0x0c, Y14, Y3
+	VPSRLD   $0x14, Y14, Y14
+	VPXOR    Y3, Y14, Y14
+	VPADDD   Y14, Y0, Y0
+	VPXOR    Y0, Y4, Y4
+	VPSHUFB  ·rol8<>+0(SB), Y4, Y4
+	VPADDD   Y4, Y12, Y12
+	VPXOR    Y12, Y14, Y14
+	VPSLLD   $0x07, Y14, Y3
+	VPSRLD   $0x19, Y14, Y14
+	VPXOR    Y3, Y14, Y14
+	VPADDD   Y9, Y5, Y5
+	VPXOR    Y5, Y1, Y1
+	VPSHUFB  ·rol16<>+0(SB), Y1, Y1
+	VPADDD   Y1, Y13, Y13
+	VPXOR    Y13, Y9, Y9
+	VPSLLD   $0x0c, Y9, Y3
+	VPSRLD   $0x14, Y9, Y9
+	VPXOR    Y3, Y9, Y9
+	VPADDD   Y9, Y5, Y5
+	VPXOR    Y5, Y1, Y1
+	VPSHUFB  ·rol8<>+0(SB), Y1, Y1
+	VPADDD   Y1, Y13, Y13
+	VPXOR    Y13, Y9, Y9
+	VPSLLD   $0x07, Y9, Y3
+	VPSRLD   $0x19, Y9, Y9
+	VPXOR    Y3, Y9, Y9
+	VPADDD   Y10, Y6, Y6
+	VPXOR    Y6, Y2, Y2
+	VPSHUFB  ·rol16<>+0(SB), Y2, Y2
+	VPADDD   Y2, Y8, Y8
+	VPXOR    Y8, Y10, Y10
+	VPSLLD   $0x0c, Y10, Y3
+	VPSRLD   $0x14, Y10, Y10
+	VPXOR    Y3, Y10, Y10
+	VPADDD   Y10, Y6, Y6
+	VPXOR    Y6, Y2, Y2
+	VPSHUFB  ·rol8<>+0(SB), Y2, Y2
+	VPADDD   Y2, Y8, Y8
+	VPXOR    Y8, Y10, Y10
+	VPSLLD   $0x07, Y10, Y3
+	VPSRLD   $0x19, Y10, Y10
+	VPXOR    Y3, Y10, Y10
+	VPALIGNR $0x0c, Y14, Y14, Y14
+	VPALIGNR $0x0c, Y9, Y9, Y9
+	VPALIGNR $0x0c, Y10, Y10, Y10
+	VPALIGNR $0x08, Y12, Y12, Y12
+	VPALIGNR $0x08, Y13, Y13, Y13
+	VPALIGNR $0x08, Y8, Y8, Y8
+	VPALIGNR $0x04, Y4, Y4, Y4
+	VPALIGNR $0x04, Y1, Y1, Y1
+	VPALIGNR $0x04, Y2, Y2, Y2
+	CMPQ     R9, CX
+	JB       openAVX2Tail384LoopB
+	CMPQ     R9, $0x0a
+	JNE      openAVX2Tail384LoopA
+	MOVQ     BX, R9
+	SUBQ     SI, BX
+	MOVQ     BX, CX
+	MOVQ     224(BP), BX
+
+openAVX2Tail384Hash:
+	ADDQ  $0x10, CX
+	CMPQ  CX, BX
+	JGT   openAVX2Tail384HashEnd
+	ADDQ  (R9), R10
+	ADCQ  8(R9), R11
+	ADCQ  $0x01, R12
+	MOVQ  (BP), DX
+	MOVQ  DX, R15
+	MULXQ R10, R13, R14
+	IMULQ R12, R15
+	MULXQ R11, AX, DX
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), DX
+	MULXQ R10, R10, AX
+	ADDQ  R10, R14
+	MULXQ R11, R11, R8
+	ADCQ  R11, R15
+	ADCQ  $0x00, R8
+	IMULQ R12, DX
+	ADDQ  AX, R15
+	ADCQ  DX, R8
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
+	LEAQ  16(R9), R9
+	JMP   openAVX2Tail384Hash
+
+openAVX2Tail384HashEnd:
+	VPADDD     ·chacha20Constants<>+0(SB), Y0, Y0
+	VPADDD     ·chacha20Constants<>+0(SB), Y5, Y5
+	VPADDD     ·chacha20Constants<>+0(SB), Y6, Y6
+	VPADDD     32(BP), Y14, Y14
+	VPADDD     32(BP), Y9, Y9
+	VPADDD     32(BP), Y10, Y10
+	VPADDD     64(BP), Y12, Y12
+	VPADDD     64(BP), Y13, Y13
+	VPADDD     64(BP), Y8, Y8
+	VPADDD     96(BP), Y4, Y4
+	VPADDD     128(BP), Y1, Y1
+	VPADDD     160(BP), Y2, Y2
+	VPERM2I128 $0x02, Y0, Y14, Y3
+	VPERM2I128 $0x02, Y12, Y4, Y7
+	VPERM2I128 $0x13, Y0, Y14, Y11
+	VPERM2I128 $0x13, Y12, Y4, Y15
+	VPXOR      (SI), Y3, Y3
+	VPXOR      32(SI), Y7, Y7
+	VPXOR      64(SI), Y11, Y11
+	VPXOR      96(SI), Y15, Y15
+	VMOVDQU    Y3, (DI)
+	VMOVDQU    Y7, 32(DI)
+	VMOVDQU    Y11, 64(DI)
+	VMOVDQU    Y15, 96(DI)
+	VPERM2I128 $0x02, Y5, Y9, Y3
+	VPERM2I128 $0x02, Y13, Y1, Y7
+	VPERM2I128 $0x13, Y5, Y9, Y11
+	VPERM2I128 $0x13, Y13, Y1, Y15
+	VPXOR      128(SI), Y3, Y3
+	VPXOR      160(SI), Y7, Y7
+	VPXOR      192(SI), Y11, Y11
+	VPXOR      224(SI), Y15, Y15
+	VMOVDQU    Y3, 128(DI)
+	VMOVDQU    Y7, 160(DI)
+	VMOVDQU    Y11, 192(DI)
+	VMOVDQU    Y15, 224(DI)
+	VPERM2I128 $0x02, Y6, Y10, Y0
+	VPERM2I128 $0x02, Y8, Y2, Y14
+	VPERM2I128 $0x13, Y6, Y10, Y12
+	VPERM2I128 $0x13, Y8, Y2, Y4
+	LEAQ       256(SI), SI
+	LEAQ       256(DI), DI
+	SUBQ       $0x00000100, BX
 	JMP        openAVX2TailLoop
 
-// ----------------------------------------------------------------------------
-// Special optimization for the last 512 bytes of ciphertext
 openAVX2Tail512:
-	VMOVDQU ·chacha20Constants<>(SB), AA0; VMOVDQA AA0, AA1; VMOVDQA AA0, AA2; VMOVDQA AA0, AA3
-	VMOVDQA state1StoreAVX2, BB0; VMOVDQA BB0, BB1; VMOVDQA BB0, BB2; VMOVDQA BB0, BB3
-	VMOVDQA state2StoreAVX2, CC0; VMOVDQA CC0, CC1; VMOVDQA CC0, CC2; VMOVDQA CC0, CC3
-	VMOVDQA ctr3StoreAVX2, DD0; VPADDD ·avx2IncMask<>(SB), DD0, DD0; VPADDD ·avx2IncMask<>(SB), DD0, DD1; VPADDD ·avx2IncMask<>(SB), DD1, DD2; VPADDD ·avx2IncMask<>(SB), DD2, DD3
-	VMOVDQA DD0, ctr0StoreAVX2; VMOVDQA DD1, ctr1StoreAVX2; VMOVDQA DD2, ctr2StoreAVX2; VMOVDQA DD3, ctr3StoreAVX2
-	XORQ    itr1, itr1
-	MOVQ    inp, itr2
+	VMOVDQU ·chacha20Constants<>+0(SB), Y0
+	VMOVDQA Y0, Y5
+	VMOVDQA Y0, Y6
+	VMOVDQA Y0, Y7
+	VMOVDQA 32(BP), Y14
+	VMOVDQA Y14, Y9
+	VMOVDQA Y14, Y10
+	VMOVDQA Y14, Y11
+	VMOVDQA 64(BP), Y12
+	VMOVDQA Y12, Y13
+	VMOVDQA Y12, Y8
+	VMOVDQA Y12, Y15
+	VMOVDQA 192(BP), Y4
+	VPADDD  ·avx2IncMask<>+0(SB), Y4, Y4
+	VPADDD  ·avx2IncMask<>+0(SB), Y4, Y1
+	VPADDD  ·avx2IncMask<>+0(SB), Y1, Y2
+	VPADDD  ·avx2IncMask<>+0(SB), Y2, Y3
+	VMOVDQA Y4, 96(BP)
+	VMOVDQA Y1, 128(BP)
+	VMOVDQA Y2, 160(BP)
+	VMOVDQA Y3, 192(BP)
+	XORQ    CX, CX
+	MOVQ    SI, R9
 
 openAVX2Tail512LoopB:
-	polyAdd(0(itr2))
-	polyMulAVX2
-	LEAQ (2*8)(itr2), itr2
+	ADDQ  (R9), R10
+	ADCQ  8(R9), R11
+	ADCQ  $0x01, R12
+	MOVQ  (BP), DX
+	MOVQ  DX, R15
+	MULXQ R10, R13, R14
+	IMULQ R12, R15
+	MULXQ R11, AX, DX
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), DX
+	MULXQ R10, R10, AX
+	ADDQ  R10, R14
+	MULXQ R11, R11, R8
+	ADCQ  R11, R15
+	ADCQ  $0x00, R8
+	IMULQ R12, DX
+	ADDQ  AX, R15
+	ADCQ  DX, R8
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
+	LEAQ  16(R9), R9
 
 openAVX2Tail512LoopA:
-	VPADDD   BB0, AA0, AA0; VPADDD BB1, AA1, AA1; VPADDD BB2, AA2, AA2; VPADDD BB3, AA3, AA3
-	VPXOR    AA0, DD0, DD0; VPXOR AA1, DD1, DD1; VPXOR AA2, DD2, DD2; VPXOR AA3, DD3, DD3
-	VPSHUFB  ·rol16<>(SB), DD0, DD0; VPSHUFB ·rol16<>(SB), DD1, DD1; VPSHUFB ·rol16<>(SB), DD2, DD2; VPSHUFB ·rol16<>(SB), DD3, DD3
-	VPADDD   DD0, CC0, CC0; VPADDD DD1, CC1, CC1; VPADDD DD2, CC2, CC2; VPADDD DD3, CC3, CC3
-	VPXOR    CC0, BB0, BB0; VPXOR CC1, BB1, BB1; VPXOR CC2, BB2, BB2; VPXOR CC3, BB3, BB3
-	VMOVDQA  CC3, tmpStoreAVX2
-	VPSLLD   $12, BB0, CC3; VPSRLD $20, BB0, BB0; VPXOR CC3, BB0, BB0
-	VPSLLD   $12, BB1, CC3; VPSRLD $20, BB1, BB1; VPXOR CC3, BB1, BB1
-	VPSLLD   $12, BB2, CC3; VPSRLD $20, BB2, BB2; VPXOR CC3, BB2, BB2
-	VPSLLD   $12, BB3, CC3; VPSRLD $20, BB3, BB3; VPXOR CC3, BB3, BB3
-	VMOVDQA  tmpStoreAVX2, CC3
-	polyAdd(0*8(itr2))
-	polyMulAVX2
-	VPADDD   BB0, AA0, AA0; VPADDD BB1, AA1, AA1; VPADDD BB2, AA2, AA2; VPADDD BB3, AA3, AA3
-	VPXOR    AA0, DD0, DD0; VPXOR AA1, DD1, DD1; VPXOR AA2, DD2, DD2; VPXOR AA3, DD3, DD3
-	VPSHUFB  ·rol8<>(SB), DD0, DD0; VPSHUFB ·rol8<>(SB), DD1, DD1; VPSHUFB ·rol8<>(SB), DD2, DD2; VPSHUFB ·rol8<>(SB), DD3, DD3
-	VPADDD   DD0, CC0, CC0; VPADDD DD1, CC1, CC1; VPADDD DD2, CC2, CC2; VPADDD DD3, CC3, CC3
-	VPXOR    CC0, BB0, BB0; VPXOR CC1, BB1, BB1; VPXOR CC2, BB2, BB2; VPXOR CC3, BB3, BB3
-	VMOVDQA  CC3, tmpStoreAVX2
-	VPSLLD   $7, BB0, CC3; VPSRLD $25, BB0, BB0; VPXOR CC3, BB0, BB0
-	VPSLLD   $7, BB1, CC3; VPSRLD $25, BB1, BB1; VPXOR CC3, BB1, BB1
-	VPSLLD   $7, BB2, CC3; VPSRLD $25, BB2, BB2; VPXOR CC3, BB2, BB2
-	VPSLLD   $7, BB3, CC3; VPSRLD $25, BB3, BB3; VPXOR CC3, BB3, BB3
-	VMOVDQA  tmpStoreAVX2, CC3
-	VPALIGNR $4, BB0, BB0, BB0; VPALIGNR $4, BB1, BB1, BB1; VPALIGNR $4, BB2, BB2, BB2; VPALIGNR $4, BB3, BB3, BB3
-	VPALIGNR $8, CC0, CC0, CC0; VPALIGNR $8, CC1, CC1, CC1; VPALIGNR $8, CC2, CC2, CC2; VPALIGNR $8, CC3, CC3, CC3
-	VPALIGNR $12, DD0, DD0, DD0; VPALIGNR $12, DD1, DD1, DD1; VPALIGNR $12, DD2, DD2, DD2; VPALIGNR $12, DD3, DD3, DD3
-	VPADDD   BB0, AA0, AA0; VPADDD BB1, AA1, AA1; VPADDD BB2, AA2, AA2; VPADDD BB3, AA3, AA3
-	VPXOR    AA0, DD0, DD0; VPXOR AA1, DD1, DD1; VPXOR AA2, DD2, DD2; VPXOR AA3, DD3, DD3
-	VPSHUFB  ·rol16<>(SB), DD0, DD0; VPSHUFB ·rol16<>(SB), DD1, DD1; VPSHUFB ·rol16<>(SB), DD2, DD2; VPSHUFB ·rol16<>(SB), DD3, DD3
-	VPADDD   DD0, CC0, CC0; VPADDD DD1, CC1, CC1; VPADDD DD2, CC2, CC2; VPADDD DD3, CC3, CC3
-	VPXOR    CC0, BB0, BB0; VPXOR CC1, BB1, BB1; VPXOR CC2, BB2, BB2; VPXOR CC3, BB3, BB3
-	polyAdd(2*8(itr2))
-	polyMulAVX2
-	LEAQ     (4*8)(itr2), itr2
-	VMOVDQA  CC3, tmpStoreAVX2
-	VPSLLD   $12, BB0, CC3; VPSRLD $20, BB0, BB0; VPXOR CC3, BB0, BB0
-	VPSLLD   $12, BB1, CC3; VPSRLD $20, BB1, BB1; VPXOR CC3, BB1, BB1
-	VPSLLD   $12, BB2, CC3; VPSRLD $20, BB2, BB2; VPXOR CC3, BB2, BB2
-	VPSLLD   $12, BB3, CC3; VPSRLD $20, BB3, BB3; VPXOR CC3, BB3, BB3
-	VMOVDQA  tmpStoreAVX2, CC3
-	VPADDD   BB0, AA0, AA0; VPADDD BB1, AA1, AA1; VPADDD BB2, AA2, AA2; VPADDD BB3, AA3, AA3
-	VPXOR    AA0, DD0, DD0; VPXOR AA1, DD1, DD1; VPXOR AA2, DD2, DD2; VPXOR AA3, DD3, DD3
-	VPSHUFB  ·rol8<>(SB), DD0, DD0; VPSHUFB ·rol8<>(SB), DD1, DD1; VPSHUFB ·rol8<>(SB), DD2, DD2; VPSHUFB ·rol8<>(SB), DD3, DD3
-	VPADDD   DD0, CC0, CC0; VPADDD DD1, CC1, CC1; VPADDD DD2, CC2, CC2; VPADDD DD3, CC3, CC3
-	VPXOR    CC0, BB0, BB0; VPXOR CC1, BB1, BB1; VPXOR CC2, BB2, BB2; VPXOR CC3, BB3, BB3
-	VMOVDQA  CC3, tmpStoreAVX2
-	VPSLLD   $7, BB0, CC3; VPSRLD $25, BB0, BB0; VPXOR CC3, BB0, BB0
-	VPSLLD   $7, BB1, CC3; VPSRLD $25, BB1, BB1; VPXOR CC3, BB1, BB1
-	VPSLLD   $7, BB2, CC3; VPSRLD $25, BB2, BB2; VPXOR CC3, BB2, BB2
-	VPSLLD   $7, BB3, CC3; VPSRLD $25, BB3, BB3; VPXOR CC3, BB3, BB3
-	VMOVDQA  tmpStoreAVX2, CC3
-	VPALIGNR $12, BB0, BB0, BB0; VPALIGNR $12, BB1, BB1, BB1; VPALIGNR $12, BB2, BB2, BB2; VPALIGNR $12, BB3, BB3, BB3
-	VPALIGNR $8, CC0, CC0, CC0; VPALIGNR $8, CC1, CC1, CC1; VPALIGNR $8, CC2, CC2, CC2; VPALIGNR $8, CC3, CC3, CC3
-	VPALIGNR $4, DD0, DD0, DD0; VPALIGNR $4, DD1, DD1, DD1; VPALIGNR $4, DD2, DD2, DD2; VPALIGNR $4, DD3, DD3, DD3
-	INCQ     itr1
-	CMPQ     itr1, $4
+	VPADDD   Y14, Y0, Y0
+	VPADDD   Y9, Y5, Y5
+	VPADDD   Y10, Y6, Y6
+	VPADDD   Y11, Y7, Y7
+	VPXOR    Y0, Y4, Y4
+	VPXOR    Y5, Y1, Y1
+	VPXOR    Y6, Y2, Y2
+	VPXOR    Y7, Y3, Y3
+	VPSHUFB  ·rol16<>+0(SB), Y4, Y4
+	VPSHUFB  ·rol16<>+0(SB), Y1, Y1
+	VPSHUFB  ·rol16<>+0(SB), Y2, Y2
+	VPSHUFB  ·rol16<>+0(SB), Y3, Y3
+	VPADDD   Y4, Y12, Y12
+	VPADDD   Y1, Y13, Y13
+	VPADDD   Y2, Y8, Y8
+	VPADDD   Y3, Y15, Y15
+	VPXOR    Y12, Y14, Y14
+	VPXOR    Y13, Y9, Y9
+	VPXOR    Y8, Y10, Y10
+	VPXOR    Y15, Y11, Y11
+	VMOVDQA  Y15, 224(BP)
+	VPSLLD   $0x0c, Y14, Y15
+	VPSRLD   $0x14, Y14, Y14
+	VPXOR    Y15, Y14, Y14
+	VPSLLD   $0x0c, Y9, Y15
+	VPSRLD   $0x14, Y9, Y9
+	VPXOR    Y15, Y9, Y9
+	VPSLLD   $0x0c, Y10, Y15
+	VPSRLD   $0x14, Y10, Y10
+	VPXOR    Y15, Y10, Y10
+	VPSLLD   $0x0c, Y11, Y15
+	VPSRLD   $0x14, Y11, Y11
+	VPXOR    Y15, Y11, Y11
+	VMOVDQA  224(BP), Y15
+	ADDQ     (R9), R10
+	ADCQ     8(R9), R11
+	ADCQ     $0x01, R12
+	MOVQ     (BP), DX
+	MOVQ     DX, R15
+	MULXQ    R10, R13, R14
+	IMULQ    R12, R15
+	MULXQ    R11, AX, DX
+	ADDQ     AX, R14
+	ADCQ     DX, R15
+	MOVQ     8(BP), DX
+	MULXQ    R10, R10, AX
+	ADDQ     R10, R14
+	MULXQ    R11, R11, R8
+	ADCQ     R11, R15
+	ADCQ     $0x00, R8
+	IMULQ    R12, DX
+	ADDQ     AX, R15
+	ADCQ     DX, R8
+	MOVQ     R13, R10
+	MOVQ     R14, R11
+	MOVQ     R15, R12
+	ANDQ     $0x03, R12
+	MOVQ     R15, R13
+	ANDQ     $-4, R13
+	MOVQ     R8, R14
+	SHRQ     $0x02, R8, R15
+	SHRQ     $0x02, R8
+	ADDQ     R13, R10
+	ADCQ     R14, R11
+	ADCQ     $0x00, R12
+	ADDQ     R15, R10
+	ADCQ     R8, R11
+	ADCQ     $0x00, R12
+	VPADDD   Y14, Y0, Y0
+	VPADDD   Y9, Y5, Y5
+	VPADDD   Y10, Y6, Y6
+	VPADDD   Y11, Y7, Y7
+	VPXOR    Y0, Y4, Y4
+	VPXOR    Y5, Y1, Y1
+	VPXOR    Y6, Y2, Y2
+	VPXOR    Y7, Y3, Y3
+	VPSHUFB  ·rol8<>+0(SB), Y4, Y4
+	VPSHUFB  ·rol8<>+0(SB), Y1, Y1
+	VPSHUFB  ·rol8<>+0(SB), Y2, Y2
+	VPSHUFB  ·rol8<>+0(SB), Y3, Y3
+	VPADDD   Y4, Y12, Y12
+	VPADDD   Y1, Y13, Y13
+	VPADDD   Y2, Y8, Y8
+	VPADDD   Y3, Y15, Y15
+	VPXOR    Y12, Y14, Y14
+	VPXOR    Y13, Y9, Y9
+	VPXOR    Y8, Y10, Y10
+	VPXOR    Y15, Y11, Y11
+	VMOVDQA  Y15, 224(BP)
+	VPSLLD   $0x07, Y14, Y15
+	VPSRLD   $0x19, Y14, Y14
+	VPXOR    Y15, Y14, Y14
+	VPSLLD   $0x07, Y9, Y15
+	VPSRLD   $0x19, Y9, Y9
+	VPXOR    Y15, Y9, Y9
+	VPSLLD   $0x07, Y10, Y15
+	VPSRLD   $0x19, Y10, Y10
+	VPXOR    Y15, Y10, Y10
+	VPSLLD   $0x07, Y11, Y15
+	VPSRLD   $0x19, Y11, Y11
+	VPXOR    Y15, Y11, Y11
+	VMOVDQA  224(BP), Y15
+	VPALIGNR $0x04, Y14, Y14, Y14
+	VPALIGNR $0x04, Y9, Y9, Y9
+	VPALIGNR $0x04, Y10, Y10, Y10
+	VPALIGNR $0x04, Y11, Y11, Y11
+	VPALIGNR $0x08, Y12, Y12, Y12
+	VPALIGNR $0x08, Y13, Y13, Y13
+	VPALIGNR $0x08, Y8, Y8, Y8
+	VPALIGNR $0x08, Y15, Y15, Y15
+	VPALIGNR $0x0c, Y4, Y4, Y4
+	VPALIGNR $0x0c, Y1, Y1, Y1
+	VPALIGNR $0x0c, Y2, Y2, Y2
+	VPALIGNR $0x0c, Y3, Y3, Y3
+	VPADDD   Y14, Y0, Y0
+	VPADDD   Y9, Y5, Y5
+	VPADDD   Y10, Y6, Y6
+	VPADDD   Y11, Y7, Y7
+	VPXOR    Y0, Y4, Y4
+	VPXOR    Y5, Y1, Y1
+	VPXOR    Y6, Y2, Y2
+	VPXOR    Y7, Y3, Y3
+	VPSHUFB  ·rol16<>+0(SB), Y4, Y4
+	VPSHUFB  ·rol16<>+0(SB), Y1, Y1
+	VPSHUFB  ·rol16<>+0(SB), Y2, Y2
+	VPSHUFB  ·rol16<>+0(SB), Y3, Y3
+	VPADDD   Y4, Y12, Y12
+	VPADDD   Y1, Y13, Y13
+	VPADDD   Y2, Y8, Y8
+	VPADDD   Y3, Y15, Y15
+	VPXOR    Y12, Y14, Y14
+	VPXOR    Y13, Y9, Y9
+	VPXOR    Y8, Y10, Y10
+	VPXOR    Y15, Y11, Y11
+	ADDQ     16(R9), R10
+	ADCQ     24(R9), R11
+	ADCQ     $0x01, R12
+	MOVQ     (BP), DX
+	MOVQ     DX, R15
+	MULXQ    R10, R13, R14
+	IMULQ    R12, R15
+	MULXQ    R11, AX, DX
+	ADDQ     AX, R14
+	ADCQ     DX, R15
+	MOVQ     8(BP), DX
+	MULXQ    R10, R10, AX
+	ADDQ     R10, R14
+	MULXQ    R11, R11, R8
+	ADCQ     R11, R15
+	ADCQ     $0x00, R8
+	IMULQ    R12, DX
+	ADDQ     AX, R15
+	ADCQ     DX, R8
+	MOVQ     R13, R10
+	MOVQ     R14, R11
+	MOVQ     R15, R12
+	ANDQ     $0x03, R12
+	MOVQ     R15, R13
+	ANDQ     $-4, R13
+	MOVQ     R8, R14
+	SHRQ     $0x02, R8, R15
+	SHRQ     $0x02, R8
+	ADDQ     R13, R10
+	ADCQ     R14, R11
+	ADCQ     $0x00, R12
+	ADDQ     R15, R10
+	ADCQ     R8, R11
+	ADCQ     $0x00, R12
+	LEAQ     32(R9), R9
+	VMOVDQA  Y15, 224(BP)
+	VPSLLD   $0x0c, Y14, Y15
+	VPSRLD   $0x14, Y14, Y14
+	VPXOR    Y15, Y14, Y14
+	VPSLLD   $0x0c, Y9, Y15
+	VPSRLD   $0x14, Y9, Y9
+	VPXOR    Y15, Y9, Y9
+	VPSLLD   $0x0c, Y10, Y15
+	VPSRLD   $0x14, Y10, Y10
+	VPXOR    Y15, Y10, Y10
+	VPSLLD   $0x0c, Y11, Y15
+	VPSRLD   $0x14, Y11, Y11
+	VPXOR    Y15, Y11, Y11
+	VMOVDQA  224(BP), Y15
+	VPADDD   Y14, Y0, Y0
+	VPADDD   Y9, Y5, Y5
+	VPADDD   Y10, Y6, Y6
+	VPADDD   Y11, Y7, Y7
+	VPXOR    Y0, Y4, Y4
+	VPXOR    Y5, Y1, Y1
+	VPXOR    Y6, Y2, Y2
+	VPXOR    Y7, Y3, Y3
+	VPSHUFB  ·rol8<>+0(SB), Y4, Y4
+	VPSHUFB  ·rol8<>+0(SB), Y1, Y1
+	VPSHUFB  ·rol8<>+0(SB), Y2, Y2
+	VPSHUFB  ·rol8<>+0(SB), Y3, Y3
+	VPADDD   Y4, Y12, Y12
+	VPADDD   Y1, Y13, Y13
+	VPADDD   Y2, Y8, Y8
+	VPADDD   Y3, Y15, Y15
+	VPXOR    Y12, Y14, Y14
+	VPXOR    Y13, Y9, Y9
+	VPXOR    Y8, Y10, Y10
+	VPXOR    Y15, Y11, Y11
+	VMOVDQA  Y15, 224(BP)
+	VPSLLD   $0x07, Y14, Y15
+	VPSRLD   $0x19, Y14, Y14
+	VPXOR    Y15, Y14, Y14
+	VPSLLD   $0x07, Y9, Y15
+	VPSRLD   $0x19, Y9, Y9
+	VPXOR    Y15, Y9, Y9
+	VPSLLD   $0x07, Y10, Y15
+	VPSRLD   $0x19, Y10, Y10
+	VPXOR    Y15, Y10, Y10
+	VPSLLD   $0x07, Y11, Y15
+	VPSRLD   $0x19, Y11, Y11
+	VPXOR    Y15, Y11, Y11
+	VMOVDQA  224(BP), Y15
+	VPALIGNR $0x0c, Y14, Y14, Y14
+	VPALIGNR $0x0c, Y9, Y9, Y9
+	VPALIGNR $0x0c, Y10, Y10, Y10
+	VPALIGNR $0x0c, Y11, Y11, Y11
+	VPALIGNR $0x08, Y12, Y12, Y12
+	VPALIGNR $0x08, Y13, Y13, Y13
+	VPALIGNR $0x08, Y8, Y8, Y8
+	VPALIGNR $0x08, Y15, Y15, Y15
+	VPALIGNR $0x04, Y4, Y4, Y4
+	VPALIGNR $0x04, Y1, Y1, Y1
+	VPALIGNR $0x04, Y2, Y2, Y2
+	VPALIGNR $0x04, Y3, Y3, Y3
+	INCQ     CX
+	CMPQ     CX, $0x04
 	JLT      openAVX2Tail512LoopB
-
-	CMPQ itr1, $10
-	JNE  openAVX2Tail512LoopA
-
-	MOVQ inl, itr1
-	SUBQ $384, itr1
-	ANDQ $-16, itr1
+	CMPQ     CX, $0x0a
+	JNE      openAVX2Tail512LoopA
+	MOVQ     BX, CX
+	SUBQ     $0x00000180, CX
+	ANDQ     $-16, CX
 
 openAVX2Tail512HashLoop:
-	TESTQ itr1, itr1
+	TESTQ CX, CX
 	JE    openAVX2Tail512HashEnd
-	polyAdd(0(itr2))
-	polyMulAVX2
-	LEAQ  16(itr2), itr2
-	SUBQ  $16, itr1
+	ADDQ  (R9), R10
+	ADCQ  8(R9), R11
+	ADCQ  $0x01, R12
+	MOVQ  (BP), DX
+	MOVQ  DX, R15
+	MULXQ R10, R13, R14
+	IMULQ R12, R15
+	MULXQ R11, AX, DX
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), DX
+	MULXQ R10, R10, AX
+	ADDQ  R10, R14
+	MULXQ R11, R11, R8
+	ADCQ  R11, R15
+	ADCQ  $0x00, R8
+	IMULQ R12, DX
+	ADDQ  AX, R15
+	ADCQ  DX, R8
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
+	LEAQ  16(R9), R9
+	SUBQ  $0x10, CX
 	JMP   openAVX2Tail512HashLoop
 
 openAVX2Tail512HashEnd:
-	VPADDD     ·chacha20Constants<>(SB), AA0, AA0; VPADDD ·chacha20Constants<>(SB), AA1, AA1; VPADDD ·chacha20Constants<>(SB), AA2, AA2; VPADDD ·chacha20Constants<>(SB), AA3, AA3
-	VPADDD     state1StoreAVX2, BB0, BB0; VPADDD state1StoreAVX2, BB1, BB1; VPADDD state1StoreAVX2, BB2, BB2; VPADDD state1StoreAVX2, BB3, BB3
-	VPADDD     state2StoreAVX2, CC0, CC0; VPADDD state2StoreAVX2, CC1, CC1; VPADDD state2StoreAVX2, CC2, CC2; VPADDD state2StoreAVX2, CC3, CC3
-	VPADDD     ctr0StoreAVX2, DD0, DD0; VPADDD ctr1StoreAVX2, DD1, DD1; VPADDD ctr2StoreAVX2, DD2, DD2; VPADDD ctr3StoreAVX2, DD3, DD3
-	VMOVDQA    CC3, tmpStoreAVX2
-	VPERM2I128 $0x02, AA0, BB0, CC3; VPERM2I128 $0x13, AA0, BB0, BB0; VPERM2I128 $0x02, CC0, DD0, AA0; VPERM2I128 $0x13, CC0, DD0, CC0
-	VPXOR      (0*32)(inp), CC3, CC3; VPXOR (1*32)(inp), AA0, AA0; VPXOR (2*32)(inp), BB0, BB0; VPXOR (3*32)(inp), CC0, CC0
-	VMOVDQU    CC3, (0*32)(oup); VMOVDQU AA0, (1*32)(oup); VMOVDQU BB0, (2*32)(oup); VMOVDQU CC0, (3*32)(oup)
-	VPERM2I128 $0x02, AA1, BB1, AA0; VPERM2I128 $0x02, CC1, DD1, BB0; VPERM2I128 $0x13, AA1, BB1, CC0; VPERM2I128 $0x13, CC1, DD1, DD0
-	VPXOR      (4*32)(inp), AA0, AA0; VPXOR (5*32)(inp), BB0, BB0; VPXOR (6*32)(inp), CC0, CC0; VPXOR (7*32)(inp), DD0, DD0
-	VMOVDQU    AA0, (4*32)(oup); VMOVDQU BB0, (5*32)(oup); VMOVDQU CC0, (6*32)(oup); VMOVDQU DD0, (7*32)(oup)
-	VPERM2I128 $0x02, AA2, BB2, AA0; VPERM2I128 $0x02, CC2, DD2, BB0; VPERM2I128 $0x13, AA2, BB2, CC0; VPERM2I128 $0x13, CC2, DD2, DD0
-	VPXOR      (8*32)(inp), AA0, AA0; VPXOR (9*32)(inp), BB0, BB0; VPXOR (10*32)(inp), CC0, CC0; VPXOR (11*32)(inp), DD0, DD0
-	VMOVDQU    AA0, (8*32)(oup); VMOVDQU BB0, (9*32)(oup); VMOVDQU CC0, (10*32)(oup); VMOVDQU DD0, (11*32)(oup)
-	VPERM2I128 $0x02, AA3, BB3, AA0; VPERM2I128 $0x02, tmpStoreAVX2, DD3, BB0; VPERM2I128 $0x13, AA3, BB3, CC0; VPERM2I128 $0x13, tmpStoreAVX2, DD3, DD0
+	VPADDD     ·chacha20Constants<>+0(SB), Y0, Y0
+	VPADDD     ·chacha20Constants<>+0(SB), Y5, Y5
+	VPADDD     ·chacha20Constants<>+0(SB), Y6, Y6
+	VPADDD     ·chacha20Constants<>+0(SB), Y7, Y7
+	VPADDD     32(BP), Y14, Y14
+	VPADDD     32(BP), Y9, Y9
+	VPADDD     32(BP), Y10, Y10
+	VPADDD     32(BP), Y11, Y11
+	VPADDD     64(BP), Y12, Y12
+	VPADDD     64(BP), Y13, Y13
+	VPADDD     64(BP), Y8, Y8
+	VPADDD     64(BP), Y15, Y15
+	VPADDD     96(BP), Y4, Y4
+	VPADDD     128(BP), Y1, Y1
+	VPADDD     160(BP), Y2, Y2
+	VPADDD     192(BP), Y3, Y3
+	VMOVDQA    Y15, 224(BP)
+	VPERM2I128 $0x02, Y0, Y14, Y15
+	VPERM2I128 $0x13, Y0, Y14, Y14
+	VPERM2I128 $0x02, Y12, Y4, Y0
+	VPERM2I128 $0x13, Y12, Y4, Y12
+	VPXOR      (SI), Y15, Y15
+	VPXOR      32(SI), Y0, Y0
+	VPXOR      64(SI), Y14, Y14
+	VPXOR      96(SI), Y12, Y12
+	VMOVDQU    Y15, (DI)
+	VMOVDQU    Y0, 32(DI)
+	VMOVDQU    Y14, 64(DI)
+	VMOVDQU    Y12, 96(DI)
+	VPERM2I128 $0x02, Y5, Y9, Y0
+	VPERM2I128 $0x02, Y13, Y1, Y14
+	VPERM2I128 $0x13, Y5, Y9, Y12
+	VPERM2I128 $0x13, Y13, Y1, Y4
+	VPXOR      128(SI), Y0, Y0
+	VPXOR      160(SI), Y14, Y14
+	VPXOR      192(SI), Y12, Y12
+	VPXOR      224(SI), Y4, Y4
+	VMOVDQU    Y0, 128(DI)
+	VMOVDQU    Y14, 160(DI)
+	VMOVDQU    Y12, 192(DI)
+	VMOVDQU    Y4, 224(DI)
+	VPERM2I128 $0x02, Y6, Y10, Y0
+	VPERM2I128 $0x02, Y8, Y2, Y14
+	VPERM2I128 $0x13, Y6, Y10, Y12
+	VPERM2I128 $0x13, Y8, Y2, Y4
+	VPXOR      256(SI), Y0, Y0
+	VPXOR      288(SI), Y14, Y14
+	VPXOR      320(SI), Y12, Y12
+	VPXOR      352(SI), Y4, Y4
+	VMOVDQU    Y0, 256(DI)
+	VMOVDQU    Y14, 288(DI)
+	VMOVDQU    Y12, 320(DI)
+	VMOVDQU    Y4, 352(DI)
+	VPERM2I128 $0x02, Y7, Y11, Y0
+	VPERM2I128 $0x02, 224(BP), Y3, Y14
+	VPERM2I128 $0x13, Y7, Y11, Y12
+	VPERM2I128 $0x13, 224(BP), Y3, Y4
+	LEAQ       384(SI), SI
+	LEAQ       384(DI), DI
+	SUBQ       $0x00000180, BX
+	JMP        openAVX2TailLoop
 
-	LEAQ (12*32)(inp), inp
-	LEAQ (12*32)(oup), oup
-	SUBQ $12*32, inl
+DATA ·chacha20Constants<>+0(SB)/4, $0x61707865
+DATA ·chacha20Constants<>+4(SB)/4, $0x3320646e
+DATA ·chacha20Constants<>+8(SB)/4, $0x79622d32
+DATA ·chacha20Constants<>+12(SB)/4, $0x6b206574
+DATA ·chacha20Constants<>+16(SB)/4, $0x61707865
+DATA ·chacha20Constants<>+20(SB)/4, $0x3320646e
+DATA ·chacha20Constants<>+24(SB)/4, $0x79622d32
+DATA ·chacha20Constants<>+28(SB)/4, $0x6b206574
+GLOBL ·chacha20Constants<>(SB), RODATA|NOPTR, $32
 
-	JMP openAVX2TailLoop
+DATA ·polyClampMask<>+0(SB)/8, $0x0ffffffc0fffffff
+DATA ·polyClampMask<>+8(SB)/8, $0x0ffffffc0ffffffc
+DATA ·polyClampMask<>+16(SB)/8, $0xffffffffffffffff
+DATA ·polyClampMask<>+24(SB)/8, $0xffffffffffffffff
+GLOBL ·polyClampMask<>(SB), RODATA|NOPTR, $32
 
-// ----------------------------------------------------------------------------
-// ----------------------------------------------------------------------------
-// func chacha20Poly1305Seal(dst, key, src, ad []byte)
-TEXT ·chacha20Poly1305Seal(SB), 0, $288-96
-	// For aligned stack access
+DATA ·sseIncMask<>+0(SB)/8, $0x0000000000000001
+DATA ·sseIncMask<>+8(SB)/8, $0x0000000000000000
+GLOBL ·sseIncMask<>(SB), RODATA|NOPTR, $16
+
+DATA ·andMask<>+0(SB)/8, $0x00000000000000ff
+DATA ·andMask<>+8(SB)/8, $0x0000000000000000
+DATA ·andMask<>+16(SB)/8, $0x000000000000ffff
+DATA ·andMask<>+24(SB)/8, $0x0000000000000000
+DATA ·andMask<>+32(SB)/8, $0x0000000000ffffff
+DATA ·andMask<>+40(SB)/8, $0x0000000000000000
+DATA ·andMask<>+48(SB)/8, $0x00000000ffffffff
+DATA ·andMask<>+56(SB)/8, $0x0000000000000000
+DATA ·andMask<>+64(SB)/8, $0x000000ffffffffff
+DATA ·andMask<>+72(SB)/8, $0x0000000000000000
+DATA ·andMask<>+80(SB)/8, $0x0000ffffffffffff
+DATA ·andMask<>+88(SB)/8, $0x0000000000000000
+DATA ·andMask<>+96(SB)/8, $0x00ffffffffffffff
+DATA ·andMask<>+104(SB)/8, $0x0000000000000000
+DATA ·andMask<>+112(SB)/8, $0xffffffffffffffff
+DATA ·andMask<>+120(SB)/8, $0x0000000000000000
+DATA ·andMask<>+128(SB)/8, $0xffffffffffffffff
+DATA ·andMask<>+136(SB)/8, $0x00000000000000ff
+DATA ·andMask<>+144(SB)/8, $0xffffffffffffffff
+DATA ·andMask<>+152(SB)/8, $0x000000000000ffff
+DATA ·andMask<>+160(SB)/8, $0xffffffffffffffff
+DATA ·andMask<>+168(SB)/8, $0x0000000000ffffff
+DATA ·andMask<>+176(SB)/8, $0xffffffffffffffff
+DATA ·andMask<>+184(SB)/8, $0x00000000ffffffff
+DATA ·andMask<>+192(SB)/8, $0xffffffffffffffff
+DATA ·andMask<>+200(SB)/8, $0x000000ffffffffff
+DATA ·andMask<>+208(SB)/8, $0xffffffffffffffff
+DATA ·andMask<>+216(SB)/8, $0x0000ffffffffffff
+DATA ·andMask<>+224(SB)/8, $0xffffffffffffffff
+DATA ·andMask<>+232(SB)/8, $0x00ffffffffffffff
+GLOBL ·andMask<>(SB), RODATA|NOPTR, $240
+
+DATA ·avx2InitMask<>+0(SB)/8, $0x0000000000000000
+DATA ·avx2InitMask<>+8(SB)/8, $0x0000000000000000
+DATA ·avx2InitMask<>+16(SB)/8, $0x0000000000000001
+DATA ·avx2InitMask<>+24(SB)/8, $0x0000000000000000
+GLOBL ·avx2InitMask<>(SB), RODATA|NOPTR, $32
+
+DATA ·rol16<>+0(SB)/8, $0x0504070601000302
+DATA ·rol16<>+8(SB)/8, $0x0d0c0f0e09080b0a
+DATA ·rol16<>+16(SB)/8, $0x0504070601000302
+DATA ·rol16<>+24(SB)/8, $0x0d0c0f0e09080b0a
+GLOBL ·rol16<>(SB), RODATA|NOPTR, $32
+
+DATA ·rol8<>+0(SB)/8, $0x0605040702010003
+DATA ·rol8<>+8(SB)/8, $0x0e0d0c0f0a09080b
+DATA ·rol8<>+16(SB)/8, $0x0605040702010003
+DATA ·rol8<>+24(SB)/8, $0x0e0d0c0f0a09080b
+GLOBL ·rol8<>(SB), RODATA|NOPTR, $32
+
+DATA ·avx2IncMask<>+0(SB)/8, $0x0000000000000002
+DATA ·avx2IncMask<>+8(SB)/8, $0x0000000000000000
+DATA ·avx2IncMask<>+16(SB)/8, $0x0000000000000002
+DATA ·avx2IncMask<>+24(SB)/8, $0x0000000000000000
+GLOBL ·avx2IncMask<>(SB), RODATA|NOPTR, $32
+
+// func chacha20Poly1305Seal(dst []byte, key []uint32, src []byte, ad []byte)
+// Requires: AVX, AVX2, BMI2, CMOV, SSE2
+TEXT ·chacha20Poly1305Seal(SB), $288-96
 	MOVQ SP, BP
-	ADDQ $32, BP
+	ADDQ $0x20, BP
 	ANDQ $-32, BP
-	MOVQ dst+0(FP), oup
-	MOVQ key+24(FP), keyp
-	MOVQ src+48(FP), inp
-	MOVQ src_len+56(FP), inl
-	MOVQ ad+72(FP), adp
-
-	CMPB ·useAVX2(SB), $1
+	MOVQ dst_base+0(FP), DI
+	MOVQ key_base+24(FP), R8
+	MOVQ src_base+48(FP), SI
+	MOVQ src_len+56(FP), BX
+	MOVQ ad_base+72(FP), CX
+	CMPB ·useAVX2+0(SB), $0x01
 	JE   chacha20Poly1305Seal_AVX2
 
 	// Special optimization, for very short buffers
-	CMPQ inl, $128
-	JBE  sealSSE128 // About 15% faster
+	CMPQ BX, $0x80
+	JBE  sealSSE128
 
 	// In the seal case - prepare the poly key + 3 blocks of stream in the first iteration
-	MOVOU ·chacha20Constants<>(SB), A0
-	MOVOU (1*16)(keyp), B0
-	MOVOU (2*16)(keyp), C0
-	MOVOU (3*16)(keyp), D0
+	MOVOU ·chacha20Constants<>+0(SB), X0
+	MOVOU 16(R8), X3
+	MOVOU 32(R8), X6
+	MOVOU 48(R8), X9
 
 	// Store state on stack for future use
-	MOVO B0, state1Store
-	MOVO C0, state2Store
+	MOVO X3, 32(BP)
+	MOVO X6, 48(BP)
 
 	// Load state, increment counter blocks
-	MOVO A0, A1; MOVO B0, B1; MOVO C0, C1; MOVO D0, D1; PADDL ·sseIncMask<>(SB), D1
-	MOVO A1, A2; MOVO B1, B2; MOVO C1, C2; MOVO D1, D2; PADDL ·sseIncMask<>(SB), D2
-	MOVO A2, A3; MOVO B2, B3; MOVO C2, C3; MOVO D2, D3; PADDL ·sseIncMask<>(SB), D3
+	MOVO  X0, X1
+	MOVO  X3, X4
+	MOVO  X6, X7
+	MOVO  X9, X10
+	PADDL ·sseIncMask<>+0(SB), X10
+	MOVO  X1, X2
+	MOVO  X4, X5
+	MOVO  X7, X8
+	MOVO  X10, X11
+	PADDL ·sseIncMask<>+0(SB), X11
+	MOVO  X2, X12
+	MOVO  X5, X13
+	MOVO  X8, X14
+	MOVO  X11, X15
+	PADDL ·sseIncMask<>+0(SB), X15
 
 	// Store counters
-	MOVO D0, ctr0Store; MOVO D1, ctr1Store; MOVO D2, ctr2Store; MOVO D3, ctr3Store
-	MOVQ $10, itr2
+	MOVO X9, 80(BP)
+	MOVO X10, 96(BP)
+	MOVO X11, 112(BP)
+	MOVO X15, 128(BP)
+	MOVQ $0x0000000a, R9
 
 sealSSEIntroLoop:
-	MOVO         C3, tmpStore
-	chachaQR(A0, B0, C0, D0, C3); chachaQR(A1, B1, C1, D1, C3); chachaQR(A2, B2, C2, D2, C3)
-	MOVO         tmpStore, C3
-	MOVO         C1, tmpStore
-	chachaQR(A3, B3, C3, D3, C1)
-	MOVO         tmpStore, C1
-	shiftB0Left; shiftB1Left; shiftB2Left; shiftB3Left
-	shiftC0Left; shiftC1Left; shiftC2Left; shiftC3Left
-	shiftD0Left; shiftD1Left; shiftD2Left; shiftD3Left
-
-	MOVO          C3, tmpStore
-	chachaQR(A0, B0, C0, D0, C3); chachaQR(A1, B1, C1, D1, C3); chachaQR(A2, B2, C2, D2, C3)
-	MOVO          tmpStore, C3
-	MOVO          C1, tmpStore
-	chachaQR(A3, B3, C3, D3, C1)
-	MOVO          tmpStore, C1
-	shiftB0Right; shiftB1Right; shiftB2Right; shiftB3Right
-	shiftC0Right; shiftC1Right; shiftC2Right; shiftC3Right
-	shiftD0Right; shiftD1Right; shiftD2Right; shiftD3Right
-	DECQ          itr2
-	JNE           sealSSEIntroLoop
+	MOVO  X14, 64(BP)
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL16(X9, X14)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X14
+	PSLLL $0x0c, X14
+	PSRLL $0x14, X3
+	PXOR  X14, X3
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL8(X9, X14)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X14
+	PSLLL $0x07, X14
+	PSRLL $0x19, X3
+	PXOR  X14, X3
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL16(X10, X14)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X14
+	PSLLL $0x0c, X14
+	PSRLL $0x14, X4
+	PXOR  X14, X4
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL8(X10, X14)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X14
+	PSLLL $0x07, X14
+	PSRLL $0x19, X4
+	PXOR  X14, X4
+	PADDD X5, X2
+	PXOR  X2, X11
+	ROL16(X11, X14)
+	PADDD X11, X8
+	PXOR  X8, X5
+	MOVO  X5, X14
+	PSLLL $0x0c, X14
+	PSRLL $0x14, X5
+	PXOR  X14, X5
+	PADDD X5, X2
+	PXOR  X2, X11
+	ROL8(X11, X14)
+	PADDD X11, X8
+	PXOR  X8, X5
+	MOVO  X5, X14
+	PSLLL $0x07, X14
+	PSRLL $0x19, X5
+	PXOR  X14, X5
+	MOVO  64(BP), X14
+	MOVO  X7, 64(BP)
+	PADDD X13, X12
+	PXOR  X12, X15
+	ROL16(X15, X7)
+	PADDD X15, X14
+	PXOR  X14, X13
+	MOVO  X13, X7
+	PSLLL $0x0c, X7
+	PSRLL $0x14, X13
+	PXOR  X7, X13
+	PADDD X13, X12
+	PXOR  X12, X15
+	ROL8(X15, X7)
+	PADDD X15, X14
+	PXOR  X14, X13
+	MOVO  X13, X7
+	PSLLL $0x07, X7
+	PSRLL $0x19, X13
+	PXOR  X7, X13
+	MOVO  64(BP), X7
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xdb
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xe4
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xed
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xed
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xf6
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xff
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xc0
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xf6
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xc9
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xd2
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xdb
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xff
+	BYTE  $0x0c
+	MOVO  X14, 64(BP)
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL16(X9, X14)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X14
+	PSLLL $0x0c, X14
+	PSRLL $0x14, X3
+	PXOR  X14, X3
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL8(X9, X14)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X14
+	PSLLL $0x07, X14
+	PSRLL $0x19, X3
+	PXOR  X14, X3
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL16(X10, X14)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X14
+	PSLLL $0x0c, X14
+	PSRLL $0x14, X4
+	PXOR  X14, X4
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL8(X10, X14)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X14
+	PSLLL $0x07, X14
+	PSRLL $0x19, X4
+	PXOR  X14, X4
+	PADDD X5, X2
+	PXOR  X2, X11
+	ROL16(X11, X14)
+	PADDD X11, X8
+	PXOR  X8, X5
+	MOVO  X5, X14
+	PSLLL $0x0c, X14
+	PSRLL $0x14, X5
+	PXOR  X14, X5
+	PADDD X5, X2
+	PXOR  X2, X11
+	ROL8(X11, X14)
+	PADDD X11, X8
+	PXOR  X8, X5
+	MOVO  X5, X14
+	PSLLL $0x07, X14
+	PSRLL $0x19, X5
+	PXOR  X14, X5
+	MOVO  64(BP), X14
+	MOVO  X7, 64(BP)
+	PADDD X13, X12
+	PXOR  X12, X15
+	ROL16(X15, X7)
+	PADDD X15, X14
+	PXOR  X14, X13
+	MOVO  X13, X7
+	PSLLL $0x0c, X7
+	PSRLL $0x14, X13
+	PXOR  X7, X13
+	PADDD X13, X12
+	PXOR  X12, X15
+	ROL8(X15, X7)
+	PADDD X15, X14
+	PXOR  X14, X13
+	MOVO  X13, X7
+	PSLLL $0x07, X7
+	PSRLL $0x19, X13
+	PXOR  X7, X13
+	MOVO  64(BP), X7
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xdb
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xe4
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xed
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xed
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xf6
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xff
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xc0
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xf6
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xc9
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xd2
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xdb
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xff
+	BYTE  $0x04
+	DECQ  R9
+	JNE   sealSSEIntroLoop
 
 	// Add in the state
-	PADDD ·chacha20Constants<>(SB), A0; PADDD ·chacha20Constants<>(SB), A1; PADDD ·chacha20Constants<>(SB), A2; PADDD ·chacha20Constants<>(SB), A3
-	PADDD state1Store, B0; PADDD state1Store, B1; PADDD state1Store, B2; PADDD state1Store, B3
-	PADDD state2Store, C1; PADDD state2Store, C2; PADDD state2Store, C3
-	PADDD ctr1Store, D1; PADDD ctr2Store, D2; PADDD ctr3Store, D3
+	PADDD ·chacha20Constants<>+0(SB), X0
+	PADDD ·chacha20Constants<>+0(SB), X1
+	PADDD ·chacha20Constants<>+0(SB), X2
+	PADDD ·chacha20Constants<>+0(SB), X12
+	PADDD 32(BP), X3
+	PADDD 32(BP), X4
+	PADDD 32(BP), X5
+	PADDD 32(BP), X13
+	PADDD 48(BP), X7
+	PADDD 48(BP), X8
+	PADDD 48(BP), X14
+	PADDD 96(BP), X10
+	PADDD 112(BP), X11
+	PADDD 128(BP), X15
 
 	// Clamp and store the key
-	PAND ·polyClampMask<>(SB), A0
-	MOVO A0, rStore
-	MOVO B0, sStore
+	PAND ·polyClampMask<>+0(SB), X0
+	MOVO X0, (BP)
+	MOVO X3, 16(BP)
 
 	// Hash AAD
-	MOVQ ad_len+80(FP), itr2
-	CALL polyHashADInternal<>(SB)
-
-	MOVOU (0*16)(inp), A0; MOVOU (1*16)(inp), B0; MOVOU (2*16)(inp), C0; MOVOU (3*16)(inp), D0
-	PXOR  A0, A1; PXOR B0, B1; PXOR C0, C1; PXOR D0, D1
-	MOVOU A1, (0*16)(oup); MOVOU B1, (1*16)(oup); MOVOU C1, (2*16)(oup); MOVOU D1, (3*16)(oup)
-	MOVOU (4*16)(inp), A0; MOVOU (5*16)(inp), B0; MOVOU (6*16)(inp), C0; MOVOU (7*16)(inp), D0
-	PXOR  A0, A2; PXOR B0, B2; PXOR C0, C2; PXOR D0, D2
-	MOVOU A2, (4*16)(oup); MOVOU B2, (5*16)(oup); MOVOU C2, (6*16)(oup); MOVOU D2, (7*16)(oup)
-
-	MOVQ $128, itr1
-	SUBQ $128, inl
-	LEAQ 128(inp), inp
-
-	MOVO A3, A1; MOVO B3, B1; MOVO C3, C1; MOVO D3, D1
-
-	CMPQ inl, $64
-	JBE  sealSSE128SealHash
-
-	MOVOU (0*16)(inp), A0; MOVOU (1*16)(inp), B0; MOVOU (2*16)(inp), C0; MOVOU (3*16)(inp), D0
-	PXOR  A0, A3; PXOR B0, B3; PXOR C0, C3; PXOR D0, D3
-	MOVOU A3, (8*16)(oup); MOVOU B3, (9*16)(oup); MOVOU C3, (10*16)(oup); MOVOU D3, (11*16)(oup)
-
-	ADDQ $64, itr1
-	SUBQ $64, inl
-	LEAQ 64(inp), inp
-
-	MOVQ $2, itr1
-	MOVQ $8, itr2
-
-	CMPQ inl, $64
-	JBE  sealSSETail64
-	CMPQ inl, $128
-	JBE  sealSSETail128
-	CMPQ inl, $192
-	JBE  sealSSETail192
+	MOVQ  ad_len+80(FP), R9
+	CALL  polyHashADInternal<>(SB)
+	MOVOU (SI), X0
+	MOVOU 16(SI), X3
+	MOVOU 32(SI), X6
+	MOVOU 48(SI), X9
+	PXOR  X0, X1
+	PXOR  X3, X4
+	PXOR  X6, X7
+	PXOR  X9, X10
+	MOVOU X1, (DI)
+	MOVOU X4, 16(DI)
+	MOVOU X7, 32(DI)
+	MOVOU X10, 48(DI)
+	MOVOU 64(SI), X0
+	MOVOU 80(SI), X3
+	MOVOU 96(SI), X6
+	MOVOU 112(SI), X9
+	PXOR  X0, X2
+	PXOR  X3, X5
+	PXOR  X6, X8
+	PXOR  X9, X11
+	MOVOU X2, 64(DI)
+	MOVOU X5, 80(DI)
+	MOVOU X8, 96(DI)
+	MOVOU X11, 112(DI)
+	MOVQ  $0x00000080, CX
+	SUBQ  $0x80, BX
+	LEAQ  128(SI), SI
+	MOVO  X12, X1
+	MOVO  X13, X4
+	MOVO  X14, X7
+	MOVO  X15, X10
+	CMPQ  BX, $0x40
+	JBE   sealSSE128SealHash
+	MOVOU (SI), X0
+	MOVOU 16(SI), X3
+	MOVOU 32(SI), X6
+	MOVOU 48(SI), X9
+	PXOR  X0, X12
+	PXOR  X3, X13
+	PXOR  X6, X14
+	PXOR  X9, X15
+	MOVOU X12, 128(DI)
+	MOVOU X13, 144(DI)
+	MOVOU X14, 160(DI)
+	MOVOU X15, 176(DI)
+	ADDQ  $0x40, CX
+	SUBQ  $0x40, BX
+	LEAQ  64(SI), SI
+	MOVQ  $0x00000002, CX
+	MOVQ  $0x00000008, R9
+	CMPQ  BX, $0x40
+	JBE   sealSSETail64
+	CMPQ  BX, $0x80
+	JBE   sealSSETail128
+	CMPQ  BX, $0xc0
+	JBE   sealSSETail192
 
 sealSSEMainLoop:
 	// Load state, increment counter blocks
-	MOVO ·chacha20Constants<>(SB), A0; MOVO state1Store, B0; MOVO state2Store, C0; MOVO ctr3Store, D0; PADDL ·sseIncMask<>(SB), D0
-	MOVO A0, A1; MOVO B0, B1; MOVO C0, C1; MOVO D0, D1; PADDL ·sseIncMask<>(SB), D1
-	MOVO A1, A2; MOVO B1, B2; MOVO C1, C2; MOVO D1, D2; PADDL ·sseIncMask<>(SB), D2
-	MOVO A2, A3; MOVO B2, B3; MOVO C2, C3; MOVO D2, D3; PADDL ·sseIncMask<>(SB), D3
+	MOVO  ·chacha20Constants<>+0(SB), X0
+	MOVO  32(BP), X3
+	MOVO  48(BP), X6
+	MOVO  128(BP), X9
+	PADDL ·sseIncMask<>+0(SB), X9
+	MOVO  X0, X1
+	MOVO  X3, X4
+	MOVO  X6, X7
+	MOVO  X9, X10
+	PADDL ·sseIncMask<>+0(SB), X10
+	MOVO  X1, X2
+	MOVO  X4, X5
+	MOVO  X7, X8
+	MOVO  X10, X11
+	PADDL ·sseIncMask<>+0(SB), X11
+	MOVO  X2, X12
+	MOVO  X5, X13
+	MOVO  X8, X14
+	MOVO  X11, X15
+	PADDL ·sseIncMask<>+0(SB), X15
 
 	// Store counters
-	MOVO D0, ctr0Store; MOVO D1, ctr1Store; MOVO D2, ctr2Store; MOVO D3, ctr3Store
+	MOVO X9, 80(BP)
+	MOVO X10, 96(BP)
+	MOVO X11, 112(BP)
+	MOVO X15, 128(BP)
 
 sealSSEInnerLoop:
-	MOVO          C3, tmpStore
-	chachaQR(A0, B0, C0, D0, C3); chachaQR(A1, B1, C1, D1, C3); chachaQR(A2, B2, C2, D2, C3)
-	MOVO          tmpStore, C3
-	MOVO          C1, tmpStore
-	chachaQR(A3, B3, C3, D3, C1)
-	MOVO          tmpStore, C1
-	polyAdd(0(oup))
-	shiftB0Left;  shiftB1Left; shiftB2Left; shiftB3Left
-	shiftC0Left;  shiftC1Left; shiftC2Left; shiftC3Left
-	shiftD0Left;  shiftD1Left; shiftD2Left; shiftD3Left
-	polyMulStage1
-	polyMulStage2
-	LEAQ          (2*8)(oup), oup
-	MOVO          C3, tmpStore
-	chachaQR(A0, B0, C0, D0, C3); chachaQR(A1, B1, C1, D1, C3); chachaQR(A2, B2, C2, D2, C3)
-	MOVO          tmpStore, C3
-	MOVO          C1, tmpStore
-	polyMulStage3
-	chachaQR(A3, B3, C3, D3, C1)
-	MOVO          tmpStore, C1
-	polyMulReduceStage
-	shiftB0Right; shiftB1Right; shiftB2Right; shiftB3Right
-	shiftC0Right; shiftC1Right; shiftC2Right; shiftC3Right
-	shiftD0Right; shiftD1Right; shiftD2Right; shiftD3Right
-	DECQ          itr2
-	JGE           sealSSEInnerLoop
-	polyAdd(0(oup))
-	polyMul
-	LEAQ          (2*8)(oup), oup
-	DECQ          itr1
-	JG            sealSSEInnerLoop
+	MOVO  X14, 64(BP)
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL16(X9, X14)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X14
+	PSLLL $0x0c, X14
+	PSRLL $0x14, X3
+	PXOR  X14, X3
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL8(X9, X14)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X14
+	PSLLL $0x07, X14
+	PSRLL $0x19, X3
+	PXOR  X14, X3
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL16(X10, X14)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X14
+	PSLLL $0x0c, X14
+	PSRLL $0x14, X4
+	PXOR  X14, X4
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL8(X10, X14)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X14
+	PSLLL $0x07, X14
+	PSRLL $0x19, X4
+	PXOR  X14, X4
+	PADDD X5, X2
+	PXOR  X2, X11
+	ROL16(X11, X14)
+	PADDD X11, X8
+	PXOR  X8, X5
+	MOVO  X5, X14
+	PSLLL $0x0c, X14
+	PSRLL $0x14, X5
+	PXOR  X14, X5
+	PADDD X5, X2
+	PXOR  X2, X11
+	ROL8(X11, X14)
+	PADDD X11, X8
+	PXOR  X8, X5
+	MOVO  X5, X14
+	PSLLL $0x07, X14
+	PSRLL $0x19, X5
+	PXOR  X14, X5
+	MOVO  64(BP), X14
+	MOVO  X7, 64(BP)
+	PADDD X13, X12
+	PXOR  X12, X15
+	ROL16(X15, X7)
+	PADDD X15, X14
+	PXOR  X14, X13
+	MOVO  X13, X7
+	PSLLL $0x0c, X7
+	PSRLL $0x14, X13
+	PXOR  X7, X13
+	PADDD X13, X12
+	PXOR  X12, X15
+	ROL8(X15, X7)
+	PADDD X15, X14
+	PXOR  X14, X13
+	MOVO  X13, X7
+	PSLLL $0x07, X7
+	PSRLL $0x19, X13
+	PXOR  X7, X13
+	MOVO  64(BP), X7
+	ADDQ  (DI), R10
+	ADCQ  8(DI), R11
+	ADCQ  $0x01, R12
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xdb
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xe4
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xed
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xed
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xf6
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xff
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xc0
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xf6
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xc9
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xd2
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xdb
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xff
+	BYTE  $0x0c
+	MOVQ  (BP), AX
+	MOVQ  AX, R15
+	MULQ  R10
+	MOVQ  AX, R13
+	MOVQ  DX, R14
+	MOVQ  (BP), AX
+	MULQ  R11
+	IMULQ R12, R15
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), AX
+	MOVQ  AX, R8
+	MULQ  R10
+	ADDQ  AX, R14
+	ADCQ  $0x00, DX
+	MOVQ  DX, R10
+	MOVQ  8(BP), AX
+	MULQ  R11
+	ADDQ  AX, R15
+	ADCQ  $0x00, DX
+	LEAQ  16(DI), DI
+	MOVO  X14, 64(BP)
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL16(X9, X14)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X14
+	PSLLL $0x0c, X14
+	PSRLL $0x14, X3
+	PXOR  X14, X3
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL8(X9, X14)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X14
+	PSLLL $0x07, X14
+	PSRLL $0x19, X3
+	PXOR  X14, X3
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL16(X10, X14)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X14
+	PSLLL $0x0c, X14
+	PSRLL $0x14, X4
+	PXOR  X14, X4
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL8(X10, X14)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X14
+	PSLLL $0x07, X14
+	PSRLL $0x19, X4
+	PXOR  X14, X4
+	PADDD X5, X2
+	PXOR  X2, X11
+	ROL16(X11, X14)
+	PADDD X11, X8
+	PXOR  X8, X5
+	MOVO  X5, X14
+	PSLLL $0x0c, X14
+	PSRLL $0x14, X5
+	PXOR  X14, X5
+	PADDD X5, X2
+	PXOR  X2, X11
+	ROL8(X11, X14)
+	PADDD X11, X8
+	PXOR  X8, X5
+	MOVO  X5, X14
+	PSLLL $0x07, X14
+	PSRLL $0x19, X5
+	PXOR  X14, X5
+	MOVO  64(BP), X14
+	MOVO  X7, 64(BP)
+	IMULQ R12, R8
+	ADDQ  R10, R15
+	ADCQ  DX, R8
+	PADDD X13, X12
+	PXOR  X12, X15
+	ROL16(X15, X7)
+	PADDD X15, X14
+	PXOR  X14, X13
+	MOVO  X13, X7
+	PSLLL $0x0c, X7
+	PSRLL $0x14, X13
+	PXOR  X7, X13
+	PADDD X13, X12
+	PXOR  X12, X15
+	ROL8(X15, X7)
+	PADDD X15, X14
+	PXOR  X14, X13
+	MOVO  X13, X7
+	PSLLL $0x07, X7
+	PSRLL $0x19, X13
+	PXOR  X7, X13
+	MOVO  64(BP), X7
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xdb
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xe4
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xed
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xed
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xf6
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xff
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xc0
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xf6
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xc9
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xd2
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xdb
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xff
+	BYTE  $0x04
+	DECQ  R9
+	JGE   sealSSEInnerLoop
+	ADDQ  (DI), R10
+	ADCQ  8(DI), R11
+	ADCQ  $0x01, R12
+	MOVQ  (BP), AX
+	MOVQ  AX, R15
+	MULQ  R10
+	MOVQ  AX, R13
+	MOVQ  DX, R14
+	MOVQ  (BP), AX
+	MULQ  R11
+	IMULQ R12, R15
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), AX
+	MOVQ  AX, R8
+	MULQ  R10
+	ADDQ  AX, R14
+	ADCQ  $0x00, DX
+	MOVQ  DX, R10
+	MOVQ  8(BP), AX
+	MULQ  R11
+	ADDQ  AX, R15
+	ADCQ  $0x00, DX
+	IMULQ R12, R8
+	ADDQ  R10, R15
+	ADCQ  DX, R8
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
+	LEAQ  16(DI), DI
+	DECQ  CX
+	JG    sealSSEInnerLoop
 
 	// Add in the state
-	PADDD ·chacha20Constants<>(SB), A0; PADDD ·chacha20Constants<>(SB), A1; PADDD ·chacha20Constants<>(SB), A2; PADDD ·chacha20Constants<>(SB), A3
-	PADDD state1Store, B0; PADDD state1Store, B1; PADDD state1Store, B2; PADDD state1Store, B3
-	PADDD state2Store, C0; PADDD state2Store, C1; PADDD state2Store, C2; PADDD state2Store, C3
-	PADDD ctr0Store, D0; PADDD ctr1Store, D1; PADDD ctr2Store, D2; PADDD ctr3Store, D3
-	MOVO  D3, tmpStore
+	PADDD ·chacha20Constants<>+0(SB), X0
+	PADDD ·chacha20Constants<>+0(SB), X1
+	PADDD ·chacha20Constants<>+0(SB), X2
+	PADDD ·chacha20Constants<>+0(SB), X12
+	PADDD 32(BP), X3
+	PADDD 32(BP), X4
+	PADDD 32(BP), X5
+	PADDD 32(BP), X13
+	PADDD 48(BP), X6
+	PADDD 48(BP), X7
+	PADDD 48(BP), X8
+	PADDD 48(BP), X14
+	PADDD 80(BP), X9
+	PADDD 96(BP), X10
+	PADDD 112(BP), X11
+	PADDD 128(BP), X15
+	MOVO  X15, 64(BP)
 
 	// Load - xor - store
-	MOVOU (0*16)(inp), D3; PXOR D3, A0
-	MOVOU (1*16)(inp), D3; PXOR D3, B0
-	MOVOU (2*16)(inp), D3; PXOR D3, C0
-	MOVOU (3*16)(inp), D3; PXOR D3, D0
-	MOVOU A0, (0*16)(oup)
-	MOVOU B0, (1*16)(oup)
-	MOVOU C0, (2*16)(oup)
-	MOVOU D0, (3*16)(oup)
-	MOVO  tmpStore, D3
-
-	MOVOU (4*16)(inp), A0; MOVOU (5*16)(inp), B0; MOVOU (6*16)(inp), C0; MOVOU (7*16)(inp), D0
-	PXOR  A0, A1; PXOR B0, B1; PXOR C0, C1; PXOR D0, D1
-	MOVOU A1, (4*16)(oup); MOVOU B1, (5*16)(oup); MOVOU C1, (6*16)(oup); MOVOU D1, (7*16)(oup)
-	MOVOU (8*16)(inp), A0; MOVOU (9*16)(inp), B0; MOVOU (10*16)(inp), C0; MOVOU (11*16)(inp), D0
-	PXOR  A0, A2; PXOR B0, B2; PXOR C0, C2; PXOR D0, D2
-	MOVOU A2, (8*16)(oup); MOVOU B2, (9*16)(oup); MOVOU C2, (10*16)(oup); MOVOU D2, (11*16)(oup)
-	ADDQ  $192, inp
-	MOVQ  $192, itr1
-	SUBQ  $192, inl
-	MOVO  A3, A1
-	MOVO  B3, B1
-	MOVO  C3, C1
-	MOVO  D3, D1
-	CMPQ  inl, $64
+	MOVOU (SI), X15
+	PXOR  X15, X0
+	MOVOU 16(SI), X15
+	PXOR  X15, X3
+	MOVOU 32(SI), X15
+	PXOR  X15, X6
+	MOVOU 48(SI), X15
+	PXOR  X15, X9
+	MOVOU X0, (DI)
+	MOVOU X3, 16(DI)
+	MOVOU X6, 32(DI)
+	MOVOU X9, 48(DI)
+	MOVO  64(BP), X15
+	MOVOU 64(SI), X0
+	MOVOU 80(SI), X3
+	MOVOU 96(SI), X6
+	MOVOU 112(SI), X9
+	PXOR  X0, X1
+	PXOR  X3, X4
+	PXOR  X6, X7
+	PXOR  X9, X10
+	MOVOU X1, 64(DI)
+	MOVOU X4, 80(DI)
+	MOVOU X7, 96(DI)
+	MOVOU X10, 112(DI)
+	MOVOU 128(SI), X0
+	MOVOU 144(SI), X3
+	MOVOU 160(SI), X6
+	MOVOU 176(SI), X9
+	PXOR  X0, X2
+	PXOR  X3, X5
+	PXOR  X6, X8
+	PXOR  X9, X11
+	MOVOU X2, 128(DI)
+	MOVOU X5, 144(DI)
+	MOVOU X8, 160(DI)
+	MOVOU X11, 176(DI)
+	ADDQ  $0xc0, SI
+	MOVQ  $0x000000c0, CX
+	SUBQ  $0xc0, BX
+	MOVO  X12, X1
+	MOVO  X13, X4
+	MOVO  X14, X7
+	MOVO  X15, X10
+	CMPQ  BX, $0x40
 	JBE   sealSSE128SealHash
-	MOVOU (0*16)(inp), A0; MOVOU (1*16)(inp), B0; MOVOU (2*16)(inp), C0; MOVOU (3*16)(inp), D0
-	PXOR  A0, A3; PXOR B0, B3; PXOR C0, C3; PXOR D0, D3
-	MOVOU A3, (12*16)(oup); MOVOU B3, (13*16)(oup); MOVOU C3, (14*16)(oup); MOVOU D3, (15*16)(oup)
-	LEAQ  64(inp), inp
-	SUBQ  $64, inl
-	MOVQ  $6, itr1
-	MOVQ  $4, itr2
-	CMPQ  inl, $192
+	MOVOU (SI), X0
+	MOVOU 16(SI), X3
+	MOVOU 32(SI), X6
+	MOVOU 48(SI), X9
+	PXOR  X0, X12
+	PXOR  X3, X13
+	PXOR  X6, X14
+	PXOR  X9, X15
+	MOVOU X12, 192(DI)
+	MOVOU X13, 208(DI)
+	MOVOU X14, 224(DI)
+	MOVOU X15, 240(DI)
+	LEAQ  64(SI), SI
+	SUBQ  $0x40, BX
+	MOVQ  $0x00000006, CX
+	MOVQ  $0x00000004, R9
+	CMPQ  BX, $0xc0
 	JG    sealSSEMainLoop
-
-	MOVQ  inl, itr1
-	TESTQ inl, inl
+	MOVQ  BX, CX
+	TESTQ BX, BX
 	JE    sealSSE128SealHash
-	MOVQ  $6, itr1
-	CMPQ  inl, $64
+	MOVQ  $0x00000006, CX
+	CMPQ  BX, $0x40
 	JBE   sealSSETail64
-	CMPQ  inl, $128
+	CMPQ  BX, $0x80
 	JBE   sealSSETail128
 	JMP   sealSSETail192
 
-// ----------------------------------------------------------------------------
-// Special optimization for the last 64 bytes of plaintext
 sealSSETail64:
-	// Need to encrypt up to 64 bytes - prepare single block, hash 192 or 256 bytes
-	MOVO  ·chacha20Constants<>(SB), A1
-	MOVO  state1Store, B1
-	MOVO  state2Store, C1
-	MOVO  ctr3Store, D1
-	PADDL ·sseIncMask<>(SB), D1
-	MOVO  D1, ctr0Store
+	MOVO  ·chacha20Constants<>+0(SB), X1
+	MOVO  32(BP), X4
+	MOVO  48(BP), X7
+	MOVO  128(BP), X10
+	PADDL ·sseIncMask<>+0(SB), X10
+	MOVO  X10, 80(BP)
 
 sealSSETail64LoopA:
-	// Perform ChaCha rounds, while hashing the previously encrypted ciphertext
-	polyAdd(0(oup))
-	polyMul
-	LEAQ 16(oup), oup
+	ADDQ  (DI), R10
+	ADCQ  8(DI), R11
+	ADCQ  $0x01, R12
+	MOVQ  (BP), AX
+	MOVQ  AX, R15
+	MULQ  R10
+	MOVQ  AX, R13
+	MOVQ  DX, R14
+	MOVQ  (BP), AX
+	MULQ  R11
+	IMULQ R12, R15
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), AX
+	MOVQ  AX, R8
+	MULQ  R10
+	ADDQ  AX, R14
+	ADCQ  $0x00, DX
+	MOVQ  DX, R10
+	MOVQ  8(BP), AX
+	MULQ  R11
+	ADDQ  AX, R15
+	ADCQ  $0x00, DX
+	IMULQ R12, R8
+	ADDQ  R10, R15
+	ADCQ  DX, R8
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
+	LEAQ  16(DI), DI
 
 sealSSETail64LoopB:
-	chachaQR(A1, B1, C1, D1, T1)
-	shiftB1Left;  shiftC1Left; shiftD1Left
-	chachaQR(A1, B1, C1, D1, T1)
-	shiftB1Right; shiftC1Right; shiftD1Right
-	polyAdd(0(oup))
-	polyMul
-	LEAQ          16(oup), oup
-
-	DECQ itr1
-	JG   sealSSETail64LoopA
-
-	DECQ  itr2
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL16(X10, X13)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X13
+	PSLLL $0x0c, X13
+	PSRLL $0x14, X4
+	PXOR  X13, X4
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL8(X10, X13)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X13
+	PSLLL $0x07, X13
+	PSRLL $0x19, X4
+	PXOR  X13, X4
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xe4
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xff
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xd2
+	BYTE  $0x0c
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL16(X10, X13)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X13
+	PSLLL $0x0c, X13
+	PSRLL $0x14, X4
+	PXOR  X13, X4
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL8(X10, X13)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X13
+	PSLLL $0x07, X13
+	PSRLL $0x19, X4
+	PXOR  X13, X4
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xe4
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xff
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xd2
+	BYTE  $0x04
+	ADDQ  (DI), R10
+	ADCQ  8(DI), R11
+	ADCQ  $0x01, R12
+	MOVQ  (BP), AX
+	MOVQ  AX, R15
+	MULQ  R10
+	MOVQ  AX, R13
+	MOVQ  DX, R14
+	MOVQ  (BP), AX
+	MULQ  R11
+	IMULQ R12, R15
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), AX
+	MOVQ  AX, R8
+	MULQ  R10
+	ADDQ  AX, R14
+	ADCQ  $0x00, DX
+	MOVQ  DX, R10
+	MOVQ  8(BP), AX
+	MULQ  R11
+	ADDQ  AX, R15
+	ADCQ  $0x00, DX
+	IMULQ R12, R8
+	ADDQ  R10, R15
+	ADCQ  DX, R8
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
+	LEAQ  16(DI), DI
+	DECQ  CX
+	JG    sealSSETail64LoopA
+	DECQ  R9
 	JGE   sealSSETail64LoopB
-	PADDL ·chacha20Constants<>(SB), A1
-	PADDL state1Store, B1
-	PADDL state2Store, C1
-	PADDL ctr0Store, D1
+	PADDL ·chacha20Constants<>+0(SB), X1
+	PADDL 32(BP), X4
+	PADDL 48(BP), X7
+	PADDL 80(BP), X10
+	JMP   sealSSE128Seal
 
-	JMP sealSSE128Seal
-
-// ----------------------------------------------------------------------------
-// Special optimization for the last 128 bytes of plaintext
 sealSSETail128:
-	// Need to encrypt up to 128 bytes - prepare two blocks, hash 192 or 256 bytes
-	MOVO ·chacha20Constants<>(SB), A0; MOVO state1Store, B0; MOVO state2Store, C0; MOVO ctr3Store, D0; PADDL ·sseIncMask<>(SB), D0; MOVO D0, ctr0Store
-	MOVO A0, A1; MOVO B0, B1; MOVO C0, C1; MOVO D0, D1; PADDL ·sseIncMask<>(SB), D1; MOVO D1, ctr1Store
+	MOVO  ·chacha20Constants<>+0(SB), X0
+	MOVO  32(BP), X3
+	MOVO  48(BP), X6
+	MOVO  128(BP), X9
+	PADDL ·sseIncMask<>+0(SB), X9
+	MOVO  X9, 80(BP)
+	MOVO  X0, X1
+	MOVO  X3, X4
+	MOVO  X6, X7
+	MOVO  X9, X10
+	PADDL ·sseIncMask<>+0(SB), X10
+	MOVO  X10, 96(BP)
 
 sealSSETail128LoopA:
-	// Perform ChaCha rounds, while hashing the previously encrypted ciphertext
-	polyAdd(0(oup))
-	polyMul
-	LEAQ 16(oup), oup
+	ADDQ  (DI), R10
+	ADCQ  8(DI), R11
+	ADCQ  $0x01, R12
+	MOVQ  (BP), AX
+	MOVQ  AX, R15
+	MULQ  R10
+	MOVQ  AX, R13
+	MOVQ  DX, R14
+	MOVQ  (BP), AX
+	MULQ  R11
+	IMULQ R12, R15
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), AX
+	MOVQ  AX, R8
+	MULQ  R10
+	ADDQ  AX, R14
+	ADCQ  $0x00, DX
+	MOVQ  DX, R10
+	MOVQ  8(BP), AX
+	MULQ  R11
+	ADDQ  AX, R15
+	ADCQ  $0x00, DX
+	IMULQ R12, R8
+	ADDQ  R10, R15
+	ADCQ  DX, R8
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
+	LEAQ  16(DI), DI
 
 sealSSETail128LoopB:
-	chachaQR(A0, B0, C0, D0, T0); chachaQR(A1, B1, C1, D1, T0)
-	shiftB0Left;  shiftC0Left; shiftD0Left
-	shiftB1Left;  shiftC1Left; shiftD1Left
-	polyAdd(0(oup))
-	polyMul
-	LEAQ          16(oup), oup
-	chachaQR(A0, B0, C0, D0, T0); chachaQR(A1, B1, C1, D1, T0)
-	shiftB0Right; shiftC0Right; shiftD0Right
-	shiftB1Right; shiftC1Right; shiftD1Right
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL16(X9, X12)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X12
+	PSLLL $0x0c, X12
+	PSRLL $0x14, X3
+	PXOR  X12, X3
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL8(X9, X12)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X12
+	PSLLL $0x07, X12
+	PSRLL $0x19, X3
+	PXOR  X12, X3
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL16(X10, X12)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X12
+	PSLLL $0x0c, X12
+	PSRLL $0x14, X4
+	PXOR  X12, X4
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL8(X10, X12)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X12
+	PSLLL $0x07, X12
+	PSRLL $0x19, X4
+	PXOR  X12, X4
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xdb
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xf6
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xc9
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xe4
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xff
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xd2
+	BYTE  $0x0c
+	ADDQ  (DI), R10
+	ADCQ  8(DI), R11
+	ADCQ  $0x01, R12
+	MOVQ  (BP), AX
+	MOVQ  AX, R15
+	MULQ  R10
+	MOVQ  AX, R13
+	MOVQ  DX, R14
+	MOVQ  (BP), AX
+	MULQ  R11
+	IMULQ R12, R15
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), AX
+	MOVQ  AX, R8
+	MULQ  R10
+	ADDQ  AX, R14
+	ADCQ  $0x00, DX
+	MOVQ  DX, R10
+	MOVQ  8(BP), AX
+	MULQ  R11
+	ADDQ  AX, R15
+	ADCQ  $0x00, DX
+	IMULQ R12, R8
+	ADDQ  R10, R15
+	ADCQ  DX, R8
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
+	LEAQ  16(DI), DI
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL16(X9, X12)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X12
+	PSLLL $0x0c, X12
+	PSRLL $0x14, X3
+	PXOR  X12, X3
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL8(X9, X12)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X12
+	PSLLL $0x07, X12
+	PSRLL $0x19, X3
+	PXOR  X12, X3
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL16(X10, X12)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X12
+	PSLLL $0x0c, X12
+	PSRLL $0x14, X4
+	PXOR  X12, X4
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL8(X10, X12)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X12
+	PSLLL $0x07, X12
+	PSRLL $0x19, X4
+	PXOR  X12, X4
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xdb
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xf6
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xc9
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xe4
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xff
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xd2
+	BYTE  $0x04
+	DECQ  CX
+	JG    sealSSETail128LoopA
+	DECQ  R9
+	JGE   sealSSETail128LoopB
+	PADDL ·chacha20Constants<>+0(SB), X0
+	PADDL ·chacha20Constants<>+0(SB), X1
+	PADDL 32(BP), X3
+	PADDL 32(BP), X4
+	PADDL 48(BP), X6
+	PADDL 48(BP), X7
+	PADDL 80(BP), X9
+	PADDL 96(BP), X10
+	MOVOU (SI), X12
+	MOVOU 16(SI), X13
+	MOVOU 32(SI), X14
+	MOVOU 48(SI), X15
+	PXOR  X12, X0
+	PXOR  X13, X3
+	PXOR  X14, X6
+	PXOR  X15, X9
+	MOVOU X0, (DI)
+	MOVOU X3, 16(DI)
+	MOVOU X6, 32(DI)
+	MOVOU X9, 48(DI)
+	MOVQ  $0x00000040, CX
+	LEAQ  64(SI), SI
+	SUBQ  $0x40, BX
+	JMP   sealSSE128SealHash
 
-	DECQ itr1
-	JG   sealSSETail128LoopA
-
-	DECQ itr2
-	JGE  sealSSETail128LoopB
-
-	PADDL ·chacha20Constants<>(SB), A0; PADDL ·chacha20Constants<>(SB), A1
-	PADDL state1Store, B0; PADDL state1Store, B1
-	PADDL state2Store, C0; PADDL state2Store, C1
-	PADDL ctr0Store, D0; PADDL ctr1Store, D1
-
-	MOVOU (0*16)(inp), T0; MOVOU (1*16)(inp), T1; MOVOU (2*16)(inp), T2; MOVOU (3*16)(inp), T3
-	PXOR  T0, A0; PXOR T1, B0; PXOR T2, C0; PXOR T3, D0
-	MOVOU A0, (0*16)(oup); MOVOU B0, (1*16)(oup); MOVOU C0, (2*16)(oup); MOVOU D0, (3*16)(oup)
-
-	MOVQ $64, itr1
-	LEAQ 64(inp), inp
-	SUBQ $64, inl
-
-	JMP sealSSE128SealHash
-
-// ----------------------------------------------------------------------------
-// Special optimization for the last 192 bytes of plaintext
 sealSSETail192:
-	// Need to encrypt up to 192 bytes - prepare three blocks, hash 192 or 256 bytes
-	MOVO ·chacha20Constants<>(SB), A0; MOVO state1Store, B0; MOVO state2Store, C0; MOVO ctr3Store, D0; PADDL ·sseIncMask<>(SB), D0; MOVO D0, ctr0Store
-	MOVO A0, A1; MOVO B0, B1; MOVO C0, C1; MOVO D0, D1; PADDL ·sseIncMask<>(SB), D1; MOVO D1, ctr1Store
-	MOVO A1, A2; MOVO B1, B2; MOVO C1, C2; MOVO D1, D2; PADDL ·sseIncMask<>(SB), D2; MOVO D2, ctr2Store
+	MOVO  ·chacha20Constants<>+0(SB), X0
+	MOVO  32(BP), X3
+	MOVO  48(BP), X6
+	MOVO  128(BP), X9
+	PADDL ·sseIncMask<>+0(SB), X9
+	MOVO  X9, 80(BP)
+	MOVO  X0, X1
+	MOVO  X3, X4
+	MOVO  X6, X7
+	MOVO  X9, X10
+	PADDL ·sseIncMask<>+0(SB), X10
+	MOVO  X10, 96(BP)
+	MOVO  X1, X2
+	MOVO  X4, X5
+	MOVO  X7, X8
+	MOVO  X10, X11
+	PADDL ·sseIncMask<>+0(SB), X11
+	MOVO  X11, 112(BP)
 
 sealSSETail192LoopA:
-	// Perform ChaCha rounds, while hashing the previously encrypted ciphertext
-	polyAdd(0(oup))
-	polyMul
-	LEAQ 16(oup), oup
+	ADDQ  (DI), R10
+	ADCQ  8(DI), R11
+	ADCQ  $0x01, R12
+	MOVQ  (BP), AX
+	MOVQ  AX, R15
+	MULQ  R10
+	MOVQ  AX, R13
+	MOVQ  DX, R14
+	MOVQ  (BP), AX
+	MULQ  R11
+	IMULQ R12, R15
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), AX
+	MOVQ  AX, R8
+	MULQ  R10
+	ADDQ  AX, R14
+	ADCQ  $0x00, DX
+	MOVQ  DX, R10
+	MOVQ  8(BP), AX
+	MULQ  R11
+	ADDQ  AX, R15
+	ADCQ  $0x00, DX
+	IMULQ R12, R8
+	ADDQ  R10, R15
+	ADCQ  DX, R8
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
+	LEAQ  16(DI), DI
 
 sealSSETail192LoopB:
-	chachaQR(A0, B0, C0, D0, T0); chachaQR(A1, B1, C1, D1, T0); chachaQR(A2, B2, C2, D2, T0)
-	shiftB0Left; shiftC0Left; shiftD0Left
-	shiftB1Left; shiftC1Left; shiftD1Left
-	shiftB2Left; shiftC2Left; shiftD2Left
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL16(X9, X12)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X12
+	PSLLL $0x0c, X12
+	PSRLL $0x14, X3
+	PXOR  X12, X3
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL8(X9, X12)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X12
+	PSLLL $0x07, X12
+	PSRLL $0x19, X3
+	PXOR  X12, X3
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL16(X10, X12)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X12
+	PSLLL $0x0c, X12
+	PSRLL $0x14, X4
+	PXOR  X12, X4
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL8(X10, X12)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X12
+	PSLLL $0x07, X12
+	PSRLL $0x19, X4
+	PXOR  X12, X4
+	PADDD X5, X2
+	PXOR  X2, X11
+	ROL16(X11, X12)
+	PADDD X11, X8
+	PXOR  X8, X5
+	MOVO  X5, X12
+	PSLLL $0x0c, X12
+	PSRLL $0x14, X5
+	PXOR  X12, X5
+	PADDD X5, X2
+	PXOR  X2, X11
+	ROL8(X11, X12)
+	PADDD X11, X8
+	PXOR  X8, X5
+	MOVO  X5, X12
+	PSLLL $0x07, X12
+	PSRLL $0x19, X5
+	PXOR  X12, X5
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xdb
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xf6
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xc9
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xe4
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xff
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xd2
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xed
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xc0
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xdb
+	BYTE  $0x0c
+	ADDQ  (DI), R10
+	ADCQ  8(DI), R11
+	ADCQ  $0x01, R12
+	MOVQ  (BP), AX
+	MOVQ  AX, R15
+	MULQ  R10
+	MOVQ  AX, R13
+	MOVQ  DX, R14
+	MOVQ  (BP), AX
+	MULQ  R11
+	IMULQ R12, R15
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), AX
+	MOVQ  AX, R8
+	MULQ  R10
+	ADDQ  AX, R14
+	ADCQ  $0x00, DX
+	MOVQ  DX, R10
+	MOVQ  8(BP), AX
+	MULQ  R11
+	ADDQ  AX, R15
+	ADCQ  $0x00, DX
+	IMULQ R12, R8
+	ADDQ  R10, R15
+	ADCQ  DX, R8
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
+	LEAQ  16(DI), DI
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL16(X9, X12)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X12
+	PSLLL $0x0c, X12
+	PSRLL $0x14, X3
+	PXOR  X12, X3
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL8(X9, X12)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X12
+	PSLLL $0x07, X12
+	PSRLL $0x19, X3
+	PXOR  X12, X3
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL16(X10, X12)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X12
+	PSLLL $0x0c, X12
+	PSRLL $0x14, X4
+	PXOR  X12, X4
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL8(X10, X12)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X12
+	PSLLL $0x07, X12
+	PSRLL $0x19, X4
+	PXOR  X12, X4
+	PADDD X5, X2
+	PXOR  X2, X11
+	ROL16(X11, X12)
+	PADDD X11, X8
+	PXOR  X8, X5
+	MOVO  X5, X12
+	PSLLL $0x0c, X12
+	PSRLL $0x14, X5
+	PXOR  X12, X5
+	PADDD X5, X2
+	PXOR  X2, X11
+	ROL8(X11, X12)
+	PADDD X11, X8
+	PXOR  X8, X5
+	MOVO  X5, X12
+	PSLLL $0x07, X12
+	PSRLL $0x19, X5
+	PXOR  X12, X5
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xdb
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xf6
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xc9
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xe4
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xff
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xd2
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xed
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xc0
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xdb
+	BYTE  $0x04
+	DECQ  CX
+	JG    sealSSETail192LoopA
+	DECQ  R9
+	JGE   sealSSETail192LoopB
+	PADDL ·chacha20Constants<>+0(SB), X0
+	PADDL ·chacha20Constants<>+0(SB), X1
+	PADDL ·chacha20Constants<>+0(SB), X2
+	PADDL 32(BP), X3
+	PADDL 32(BP), X4
+	PADDL 32(BP), X5
+	PADDL 48(BP), X6
+	PADDL 48(BP), X7
+	PADDL 48(BP), X8
+	PADDL 80(BP), X9
+	PADDL 96(BP), X10
+	PADDL 112(BP), X11
+	MOVOU (SI), X12
+	MOVOU 16(SI), X13
+	MOVOU 32(SI), X14
+	MOVOU 48(SI), X15
+	PXOR  X12, X0
+	PXOR  X13, X3
+	PXOR  X14, X6
+	PXOR  X15, X9
+	MOVOU X0, (DI)
+	MOVOU X3, 16(DI)
+	MOVOU X6, 32(DI)
+	MOVOU X9, 48(DI)
+	MOVOU 64(SI), X12
+	MOVOU 80(SI), X13
+	MOVOU 96(SI), X14
+	MOVOU 112(SI), X15
+	PXOR  X12, X1
+	PXOR  X13, X4
+	PXOR  X14, X7
+	PXOR  X15, X10
+	MOVOU X1, 64(DI)
+	MOVOU X4, 80(DI)
+	MOVOU X7, 96(DI)
+	MOVOU X10, 112(DI)
+	MOVO  X2, X1
+	MOVO  X5, X4
+	MOVO  X8, X7
+	MOVO  X11, X10
+	MOVQ  $0x00000080, CX
+	LEAQ  128(SI), SI
+	SUBQ  $0x80, BX
+	JMP   sealSSE128SealHash
 
-	polyAdd(0(oup))
-	polyMul
-	LEAQ 16(oup), oup
-
-	chachaQR(A0, B0, C0, D0, T0); chachaQR(A1, B1, C1, D1, T0); chachaQR(A2, B2, C2, D2, T0)
-	shiftB0Right; shiftC0Right; shiftD0Right
-	shiftB1Right; shiftC1Right; shiftD1Right
-	shiftB2Right; shiftC2Right; shiftD2Right
-
-	DECQ itr1
-	JG   sealSSETail192LoopA
-
-	DECQ itr2
-	JGE  sealSSETail192LoopB
-
-	PADDL ·chacha20Constants<>(SB), A0; PADDL ·chacha20Constants<>(SB), A1; PADDL ·chacha20Constants<>(SB), A2
-	PADDL state1Store, B0; PADDL state1Store, B1; PADDL state1Store, B2
-	PADDL state2Store, C0; PADDL state2Store, C1; PADDL state2Store, C2
-	PADDL ctr0Store, D0; PADDL ctr1Store, D1; PADDL ctr2Store, D2
-
-	MOVOU (0*16)(inp), T0; MOVOU (1*16)(inp), T1; MOVOU (2*16)(inp), T2; MOVOU (3*16)(inp), T3
-	PXOR  T0, A0; PXOR T1, B0; PXOR T2, C0; PXOR T3, D0
-	MOVOU A0, (0*16)(oup); MOVOU B0, (1*16)(oup); MOVOU C0, (2*16)(oup); MOVOU D0, (3*16)(oup)
-	MOVOU (4*16)(inp), T0; MOVOU (5*16)(inp), T1; MOVOU (6*16)(inp), T2; MOVOU (7*16)(inp), T3
-	PXOR  T0, A1; PXOR T1, B1; PXOR T2, C1; PXOR T3, D1
-	MOVOU A1, (4*16)(oup); MOVOU B1, (5*16)(oup); MOVOU C1, (6*16)(oup); MOVOU D1, (7*16)(oup)
-
-	MOVO A2, A1
-	MOVO B2, B1
-	MOVO C2, C1
-	MOVO D2, D1
-	MOVQ $128, itr1
-	LEAQ 128(inp), inp
-	SUBQ $128, inl
-
-	JMP sealSSE128SealHash
-
-// ----------------------------------------------------------------------------
-// Special seal optimization for buffers smaller than 129 bytes
 sealSSE128:
-	// For up to 128 bytes of ciphertext and 64 bytes for the poly key, we require to process three blocks
-	MOVOU ·chacha20Constants<>(SB), A0; MOVOU (1*16)(keyp), B0; MOVOU (2*16)(keyp), C0; MOVOU (3*16)(keyp), D0
-	MOVO  A0, A1; MOVO B0, B1; MOVO C0, C1; MOVO D0, D1; PADDL ·sseIncMask<>(SB), D1
-	MOVO  A1, A2; MOVO B1, B2; MOVO C1, C2; MOVO D1, D2; PADDL ·sseIncMask<>(SB), D2
-	MOVO  B0, T1; MOVO C0, T2; MOVO D1, T3
-	MOVQ  $10, itr2
+	MOVOU ·chacha20Constants<>+0(SB), X0
+	MOVOU 16(R8), X3
+	MOVOU 32(R8), X6
+	MOVOU 48(R8), X9
+	MOVO  X0, X1
+	MOVO  X3, X4
+	MOVO  X6, X7
+	MOVO  X9, X10
+	PADDL ·sseIncMask<>+0(SB), X10
+	MOVO  X1, X2
+	MOVO  X4, X5
+	MOVO  X7, X8
+	MOVO  X10, X11
+	PADDL ·sseIncMask<>+0(SB), X11
+	MOVO  X3, X13
+	MOVO  X6, X14
+	MOVO  X10, X15
+	MOVQ  $0x0000000a, R9
 
 sealSSE128InnerCipherLoop:
-	chachaQR(A0, B0, C0, D0, T0); chachaQR(A1, B1, C1, D1, T0); chachaQR(A2, B2, C2, D2, T0)
-	shiftB0Left;  shiftB1Left; shiftB2Left
-	shiftC0Left;  shiftC1Left; shiftC2Left
-	shiftD0Left;  shiftD1Left; shiftD2Left
-	chachaQR(A0, B0, C0, D0, T0); chachaQR(A1, B1, C1, D1, T0); chachaQR(A2, B2, C2, D2, T0)
-	shiftB0Right; shiftB1Right; shiftB2Right
-	shiftC0Right; shiftC1Right; shiftC2Right
-	shiftD0Right; shiftD1Right; shiftD2Right
-	DECQ          itr2
-	JNE           sealSSE128InnerCipherLoop
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL16(X9, X12)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X12
+	PSLLL $0x0c, X12
+	PSRLL $0x14, X3
+	PXOR  X12, X3
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL8(X9, X12)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X12
+	PSLLL $0x07, X12
+	PSRLL $0x19, X3
+	PXOR  X12, X3
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL16(X10, X12)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X12
+	PSLLL $0x0c, X12
+	PSRLL $0x14, X4
+	PXOR  X12, X4
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL8(X10, X12)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X12
+	PSLLL $0x07, X12
+	PSRLL $0x19, X4
+	PXOR  X12, X4
+	PADDD X5, X2
+	PXOR  X2, X11
+	ROL16(X11, X12)
+	PADDD X11, X8
+	PXOR  X8, X5
+	MOVO  X5, X12
+	PSLLL $0x0c, X12
+	PSRLL $0x14, X5
+	PXOR  X12, X5
+	PADDD X5, X2
+	PXOR  X2, X11
+	ROL8(X11, X12)
+	PADDD X11, X8
+	PXOR  X8, X5
+	MOVO  X5, X12
+	PSLLL $0x07, X12
+	PSRLL $0x19, X5
+	PXOR  X12, X5
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xdb
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xe4
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xed
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xf6
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xff
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xc0
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xc9
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xd2
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xdb
+	BYTE  $0x0c
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL16(X9, X12)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X12
+	PSLLL $0x0c, X12
+	PSRLL $0x14, X3
+	PXOR  X12, X3
+	PADDD X3, X0
+	PXOR  X0, X9
+	ROL8(X9, X12)
+	PADDD X9, X6
+	PXOR  X6, X3
+	MOVO  X3, X12
+	PSLLL $0x07, X12
+	PSRLL $0x19, X3
+	PXOR  X12, X3
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL16(X10, X12)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X12
+	PSLLL $0x0c, X12
+	PSRLL $0x14, X4
+	PXOR  X12, X4
+	PADDD X4, X1
+	PXOR  X1, X10
+	ROL8(X10, X12)
+	PADDD X10, X7
+	PXOR  X7, X4
+	MOVO  X4, X12
+	PSLLL $0x07, X12
+	PSRLL $0x19, X4
+	PXOR  X12, X4
+	PADDD X5, X2
+	PXOR  X2, X11
+	ROL16(X11, X12)
+	PADDD X11, X8
+	PXOR  X8, X5
+	MOVO  X5, X12
+	PSLLL $0x0c, X12
+	PSRLL $0x14, X5
+	PXOR  X12, X5
+	PADDD X5, X2
+	PXOR  X2, X11
+	ROL8(X11, X12)
+	PADDD X11, X8
+	PXOR  X8, X5
+	MOVO  X5, X12
+	PSLLL $0x07, X12
+	PSRLL $0x19, X5
+	PXOR  X12, X5
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xdb
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xe4
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xed
+	BYTE  $0x0c
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xf6
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xff
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xc0
+	BYTE  $0x08
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xc9
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xd2
+	BYTE  $0x04
+	BYTE  $0x66
+	BYTE  $0x45
+	BYTE  $0x0f
+	BYTE  $0x3a
+	BYTE  $0x0f
+	BYTE  $0xdb
+	BYTE  $0x04
+	DECQ  R9
+	JNE   sealSSE128InnerCipherLoop
 
 	// A0|B0 hold the Poly1305 32-byte key, C0,D0 can be discarded
-	PADDL ·chacha20Constants<>(SB), A0; PADDL ·chacha20Constants<>(SB), A1; PADDL ·chacha20Constants<>(SB), A2
-	PADDL T1, B0; PADDL T1, B1; PADDL T1, B2
-	PADDL T2, C1; PADDL T2, C2
-	PADDL T3, D1; PADDL ·sseIncMask<>(SB), T3; PADDL T3, D2
-	PAND  ·polyClampMask<>(SB), A0
-	MOVOU A0, rStore
-	MOVOU B0, sStore
+	PADDL ·chacha20Constants<>+0(SB), X0
+	PADDL ·chacha20Constants<>+0(SB), X1
+	PADDL ·chacha20Constants<>+0(SB), X2
+	PADDL X13, X3
+	PADDL X13, X4
+	PADDL X13, X5
+	PADDL X14, X7
+	PADDL X14, X8
+	PADDL X15, X10
+	PADDL ·sseIncMask<>+0(SB), X15
+	PADDL X15, X11
+	PAND  ·polyClampMask<>+0(SB), X0
+	MOVOU X0, (BP)
+	MOVOU X3, 16(BP)
 
 	// Hash
-	MOVQ ad_len+80(FP), itr2
+	MOVQ ad_len+80(FP), R9
 	CALL polyHashADInternal<>(SB)
-	XORQ itr1, itr1
+	XORQ CX, CX
 
 sealSSE128SealHash:
-	// itr1 holds the number of bytes encrypted but not yet hashed
-	CMPQ itr1, $16
-	JB   sealSSE128Seal
-	polyAdd(0(oup))
-	polyMul
-
-	SUBQ $16, itr1
-	ADDQ $16, oup
-
-	JMP sealSSE128SealHash
+	CMPQ  CX, $0x10
+	JB    sealSSE128Seal
+	ADDQ  (DI), R10
+	ADCQ  8(DI), R11
+	ADCQ  $0x01, R12
+	MOVQ  (BP), AX
+	MOVQ  AX, R15
+	MULQ  R10
+	MOVQ  AX, R13
+	MOVQ  DX, R14
+	MOVQ  (BP), AX
+	MULQ  R11
+	IMULQ R12, R15
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), AX
+	MOVQ  AX, R8
+	MULQ  R10
+	ADDQ  AX, R14
+	ADCQ  $0x00, DX
+	MOVQ  DX, R10
+	MOVQ  8(BP), AX
+	MULQ  R11
+	ADDQ  AX, R15
+	ADCQ  $0x00, DX
+	IMULQ R12, R8
+	ADDQ  R10, R15
+	ADCQ  DX, R8
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
+	SUBQ  $0x10, CX
+	ADDQ  $0x10, DI
+	JMP   sealSSE128SealHash
 
 sealSSE128Seal:
-	CMPQ inl, $16
+	CMPQ BX, $0x10
 	JB   sealSSETail
-	SUBQ $16, inl
+	SUBQ $0x10, BX
 
 	// Load for decryption
-	MOVOU (inp), T0
-	PXOR  T0, A1
-	MOVOU A1, (oup)
-	LEAQ  (1*16)(inp), inp
-	LEAQ  (1*16)(oup), oup
+	MOVOU (SI), X12
+	PXOR  X12, X1
+	MOVOU X1, (DI)
+	LEAQ  16(SI), SI
+	LEAQ  16(DI), DI
 
 	// Extract for hashing
-	MOVQ   A1, t0
-	PSRLDQ $8, A1
-	MOVQ A1, t1
-	ADDQ   t0, acc0; ADCQ t1, acc1; ADCQ $1, acc2
-	polyMul
+	MOVQ   X1, R13
+	PSRLDQ $0x08, X1
+	MOVQ   X1, R14
+	ADDQ   R13, R10
+	ADCQ   R14, R11
+	ADCQ   $0x01, R12
+	MOVQ   (BP), AX
+	MOVQ   AX, R15
+	MULQ   R10
+	MOVQ   AX, R13
+	MOVQ   DX, R14
+	MOVQ   (BP), AX
+	MULQ   R11
+	IMULQ  R12, R15
+	ADDQ   AX, R14
+	ADCQ   DX, R15
+	MOVQ   8(BP), AX
+	MOVQ   AX, R8
+	MULQ   R10
+	ADDQ   AX, R14
+	ADCQ   $0x00, DX
+	MOVQ   DX, R10
+	MOVQ   8(BP), AX
+	MULQ   R11
+	ADDQ   AX, R15
+	ADCQ   $0x00, DX
+	IMULQ  R12, R8
+	ADDQ   R10, R15
+	ADCQ   DX, R8
+	MOVQ   R13, R10
+	MOVQ   R14, R11
+	MOVQ   R15, R12
+	ANDQ   $0x03, R12
+	MOVQ   R15, R13
+	ANDQ   $-4, R13
+	MOVQ   R8, R14
+	SHRQ   $0x02, R8, R15
+	SHRQ   $0x02, R8
+	ADDQ   R13, R10
+	ADCQ   R14, R11
+	ADCQ   $0x00, R12
+	ADDQ   R15, R10
+	ADCQ   R8, R11
+	ADCQ   $0x00, R12
 
 	// Shift the stream "left"
-	MOVO B1, A1
-	MOVO C1, B1
-	MOVO D1, C1
-	MOVO A2, D1
-	MOVO B2, A2
-	MOVO C2, B2
-	MOVO D2, C2
+	MOVO X4, X1
+	MOVO X7, X4
+	MOVO X10, X7
+	MOVO X2, X10
+	MOVO X5, X2
+	MOVO X8, X5
+	MOVO X11, X8
 	JMP  sealSSE128Seal
 
 sealSSETail:
-	TESTQ inl, inl
+	TESTQ BX, BX
 	JE    sealSSEFinalize
 
 	// We can only load the PT one byte at a time to avoid read after end of buffer
-	MOVQ inl, itr2
-	SHLQ $4, itr2
-	LEAQ ·andMask<>(SB), t0
-	MOVQ inl, itr1
-	LEAQ -1(inp)(inl*1), inp
-	XORQ t2, t2
-	XORQ t3, t3
+	MOVQ BX, R9
+	SHLQ $0x04, R9
+	LEAQ ·andMask<>+0(SB), R13
+	MOVQ BX, CX
+	LEAQ -1(SI)(BX*1), SI
+	XORQ R15, R15
+	XORQ R8, R8
 	XORQ AX, AX
 
 sealSSETailLoadLoop:
-	SHLQ $8, t2, t3
-	SHLQ $8, t2
-	MOVB (inp), AX
-	XORQ AX, t2
-	LEAQ   -1(inp), inp
-	DECQ   itr1
+	SHLQ   $0x08, R15, R8
+	SHLQ   $0x08, R15
+	MOVB   (SI), AX
+	XORQ   AX, R15
+	LEAQ   -1(SI), SI
+	DECQ   CX
 	JNE    sealSSETailLoadLoop
-	MOVQ t2, 0+tmpStore
-	MOVQ t3, 8+tmpStore
-	PXOR 0+tmpStore, A1
-	MOVOU  A1, (oup)
-	MOVOU  -16(t0)(itr2*1), T0
-	PAND   T0, A1
-	MOVQ   A1, t0
-	PSRLDQ $8, A1
-	MOVQ   A1, t1
-	ADDQ   t0, acc0; ADCQ t1, acc1; ADCQ $1, acc2
-	polyMul
-
-	ADDQ inl, oup
+	MOVQ   R15, 64(BP)
+	MOVQ   R8, 72(BP)
+	PXOR   64(BP), X1
+	MOVOU  X1, (DI)
+	MOVOU  -16(R13)(R9*1), X12
+	PAND   X12, X1
+	MOVQ   X1, R13
+	PSRLDQ $0x08, X1
+	MOVQ   X1, R14
+	ADDQ   R13, R10
+	ADCQ   R14, R11
+	ADCQ   $0x01, R12
+	MOVQ   (BP), AX
+	MOVQ   AX, R15
+	MULQ   R10
+	MOVQ   AX, R13
+	MOVQ   DX, R14
+	MOVQ   (BP), AX
+	MULQ   R11
+	IMULQ  R12, R15
+	ADDQ   AX, R14
+	ADCQ   DX, R15
+	MOVQ   8(BP), AX
+	MOVQ   AX, R8
+	MULQ   R10
+	ADDQ   AX, R14
+	ADCQ   $0x00, DX
+	MOVQ   DX, R10
+	MOVQ   8(BP), AX
+	MULQ   R11
+	ADDQ   AX, R15
+	ADCQ   $0x00, DX
+	IMULQ  R12, R8
+	ADDQ   R10, R15
+	ADCQ   DX, R8
+	MOVQ   R13, R10
+	MOVQ   R14, R11
+	MOVQ   R15, R12
+	ANDQ   $0x03, R12
+	MOVQ   R15, R13
+	ANDQ   $-4, R13
+	MOVQ   R8, R14
+	SHRQ   $0x02, R8, R15
+	SHRQ   $0x02, R8
+	ADDQ   R13, R10
+	ADCQ   R14, R11
+	ADCQ   $0x00, R12
+	ADDQ   R15, R10
+	ADCQ   R8, R11
+	ADCQ   $0x00, R12
+	ADDQ   BX, DI
 
 sealSSEFinalize:
 	// Hash in the buffer lengths
-	ADDQ ad_len+80(FP), acc0
-	ADCQ src_len+56(FP), acc1
-	ADCQ $1, acc2
-	polyMul
+	ADDQ  ad_len+80(FP), R10
+	ADCQ  src_len+56(FP), R11
+	ADCQ  $0x01, R12
+	MOVQ  (BP), AX
+	MOVQ  AX, R15
+	MULQ  R10
+	MOVQ  AX, R13
+	MOVQ  DX, R14
+	MOVQ  (BP), AX
+	MULQ  R11
+	IMULQ R12, R15
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), AX
+	MOVQ  AX, R8
+	MULQ  R10
+	ADDQ  AX, R14
+	ADCQ  $0x00, DX
+	MOVQ  DX, R10
+	MOVQ  8(BP), AX
+	MULQ  R11
+	ADDQ  AX, R15
+	ADCQ  $0x00, DX
+	IMULQ R12, R8
+	ADDQ  R10, R15
+	ADCQ  DX, R8
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
 
 	// Final reduce
-	MOVQ    acc0, t0
-	MOVQ    acc1, t1
-	MOVQ    acc2, t2
-	SUBQ    $-5, acc0
-	SBBQ    $-1, acc1
-	SBBQ    $3, acc2
-	CMOVQCS t0, acc0
-	CMOVQCS t1, acc1
-	CMOVQCS t2, acc2
+	MOVQ    R10, R13
+	MOVQ    R11, R14
+	MOVQ    R12, R15
+	SUBQ    $-5, R10
+	SBBQ    $-1, R11
+	SBBQ    $0x03, R12
+	CMOVQCS R13, R10
+	CMOVQCS R14, R11
+	CMOVQCS R15, R12
 
 	// Add in the "s" part of the key
-	ADDQ 0+sStore, acc0
-	ADCQ 8+sStore, acc1
+	ADDQ 16(BP), R10
+	ADCQ 24(BP), R11
 
 	// Finally store the tag at the end of the message
-	MOVQ acc0, (0*8)(oup)
-	MOVQ acc1, (1*8)(oup)
+	MOVQ R10, (DI)
+	MOVQ R11, 8(DI)
 	RET
 
-// ----------------------------------------------------------------------------
-// ------------------------- AVX2 Code ----------------------------------------
 chacha20Poly1305Seal_AVX2:
 	VZEROUPPER
-	VMOVDQU ·chacha20Constants<>(SB), AA0
-	BYTE    $0xc4; BYTE $0x42; BYTE $0x7d; BYTE $0x5a; BYTE $0x70; BYTE $0x10 // broadcasti128 16(r8), ymm14
-	BYTE    $0xc4; BYTE $0x42; BYTE $0x7d; BYTE $0x5a; BYTE $0x60; BYTE $0x20 // broadcasti128 32(r8), ymm12
-	BYTE    $0xc4; BYTE $0xc2; BYTE $0x7d; BYTE $0x5a; BYTE $0x60; BYTE $0x30 // broadcasti128 48(r8), ymm4
-	VPADDD  ·avx2InitMask<>(SB), DD0, DD0
+	VMOVDQU ·chacha20Constants<>+0(SB), Y0
+	BYTE    $0xc4
+	BYTE    $0x42
+	BYTE    $0x7d
+	BYTE    $0x5a
+	BYTE    $0x70
+	BYTE    $0x10
+	BYTE    $0xc4
+	BYTE    $0x42
+	BYTE    $0x7d
+	BYTE    $0x5a
+	BYTE    $0x60
+	BYTE    $0x20
+	BYTE    $0xc4
+	BYTE    $0xc2
+	BYTE    $0x7d
+	BYTE    $0x5a
+	BYTE    $0x60
+	BYTE    $0x30
+	VPADDD  ·avx2InitMask<>+0(SB), Y4, Y4
 
 	// Special optimizations, for very short buffers
-	CMPQ inl, $192
-	JBE  seal192AVX2 // 33% faster
-	CMPQ inl, $320
-	JBE  seal320AVX2 // 17% faster
+	CMPQ BX, $0x000000c0
+	JBE  seal192AVX2
+	CMPQ BX, $0x00000140
+	JBE  seal320AVX2
 
 	// For the general key prepare the key first - as a byproduct we have 64 bytes of cipher stream
-	VMOVDQA AA0, AA1; VMOVDQA AA0, AA2; VMOVDQA AA0, AA3
-	VMOVDQA BB0, BB1; VMOVDQA BB0, BB2; VMOVDQA BB0, BB3; VMOVDQA BB0, state1StoreAVX2
-	VMOVDQA CC0, CC1; VMOVDQA CC0, CC2; VMOVDQA CC0, CC3; VMOVDQA CC0, state2StoreAVX2
-	VPADDD  ·avx2IncMask<>(SB), DD0, DD1; VMOVDQA DD0, ctr0StoreAVX2
-	VPADDD  ·avx2IncMask<>(SB), DD1, DD2; VMOVDQA DD1, ctr1StoreAVX2
-	VPADDD  ·avx2IncMask<>(SB), DD2, DD3; VMOVDQA DD2, ctr2StoreAVX2
-	VMOVDQA DD3, ctr3StoreAVX2
-	MOVQ    $10, itr2
+	VMOVDQA Y0, Y5
+	VMOVDQA Y0, Y6
+	VMOVDQA Y0, Y7
+	VMOVDQA Y14, Y9
+	VMOVDQA Y14, Y10
+	VMOVDQA Y14, Y11
+	VMOVDQA Y14, 32(BP)
+	VMOVDQA Y12, Y13
+	VMOVDQA Y12, Y8
+	VMOVDQA Y12, Y15
+	VMOVDQA Y12, 64(BP)
+	VPADDD  ·avx2IncMask<>+0(SB), Y4, Y1
+	VMOVDQA Y4, 96(BP)
+	VPADDD  ·avx2IncMask<>+0(SB), Y1, Y2
+	VMOVDQA Y1, 128(BP)
+	VPADDD  ·avx2IncMask<>+0(SB), Y2, Y3
+	VMOVDQA Y2, 160(BP)
+	VMOVDQA Y3, 192(BP)
+	MOVQ    $0x0000000a, R9
 
 sealAVX2IntroLoop:
-	VMOVDQA CC3, tmpStoreAVX2
-	chachaQR_AVX2(AA0, BB0, CC0, DD0, CC3); chachaQR_AVX2(AA1, BB1, CC1, DD1, CC3); chachaQR_AVX2(AA2, BB2, CC2, DD2, CC3)
-	VMOVDQA tmpStoreAVX2, CC3
-	VMOVDQA CC1, tmpStoreAVX2
-	chachaQR_AVX2(AA3, BB3, CC3, DD3, CC1)
-	VMOVDQA tmpStoreAVX2, CC1
-
-	VPALIGNR $4, BB0, BB0, BB0; VPALIGNR $8, CC0, CC0, CC0; VPALIGNR $12, DD0, DD0, DD0
-	VPALIGNR $4, BB1, BB1, BB1; VPALIGNR $8, CC1, CC1, CC1; VPALIGNR $12, DD1, DD1, DD1
-	VPALIGNR $4, BB2, BB2, BB2; VPALIGNR $8, CC2, CC2, CC2; VPALIGNR $12, DD2, DD2, DD2
-	VPALIGNR $4, BB3, BB3, BB3; VPALIGNR $8, CC3, CC3, CC3; VPALIGNR $12, DD3, DD3, DD3
-
-	VMOVDQA CC3, tmpStoreAVX2
-	chachaQR_AVX2(AA0, BB0, CC0, DD0, CC3); chachaQR_AVX2(AA1, BB1, CC1, DD1, CC3); chachaQR_AVX2(AA2, BB2, CC2, DD2, CC3)
-	VMOVDQA tmpStoreAVX2, CC3
-	VMOVDQA CC1, tmpStoreAVX2
-	chachaQR_AVX2(AA3, BB3, CC3, DD3, CC1)
-	VMOVDQA tmpStoreAVX2, CC1
-
-	VPALIGNR $12, BB0, BB0, BB0; VPALIGNR $8, CC0, CC0, CC0; VPALIGNR $4, DD0, DD0, DD0
-	VPALIGNR $12, BB1, BB1, BB1; VPALIGNR $8, CC1, CC1, CC1; VPALIGNR $4, DD1, DD1, DD1
-	VPALIGNR $12, BB2, BB2, BB2; VPALIGNR $8, CC2, CC2, CC2; VPALIGNR $4, DD2, DD2, DD2
-	VPALIGNR $12, BB3, BB3, BB3; VPALIGNR $8, CC3, CC3, CC3; VPALIGNR $4, DD3, DD3, DD3
-	DECQ     itr2
-	JNE      sealAVX2IntroLoop
-
-	VPADDD ·chacha20Constants<>(SB), AA0, AA0; VPADDD ·chacha20Constants<>(SB), AA1, AA1; VPADDD ·chacha20Constants<>(SB), AA2, AA2; VPADDD ·chacha20Constants<>(SB), AA3, AA3
-	VPADDD state1StoreAVX2, BB0, BB0; VPADDD state1StoreAVX2, BB1, BB1; VPADDD state1StoreAVX2, BB2, BB2; VPADDD state1StoreAVX2, BB3, BB3
-	VPADDD state2StoreAVX2, CC0, CC0; VPADDD state2StoreAVX2, CC1, CC1; VPADDD state2StoreAVX2, CC2, CC2; VPADDD state2StoreAVX2, CC3, CC3
-	VPADDD ctr0StoreAVX2, DD0, DD0; VPADDD ctr1StoreAVX2, DD1, DD1; VPADDD ctr2StoreAVX2, DD2, DD2; VPADDD ctr3StoreAVX2, DD3, DD3
-
-	VPERM2I128 $0x13, CC0, DD0, CC0 // Stream bytes 96 - 127
-	VPERM2I128 $0x02, AA0, BB0, DD0 // The Poly1305 key
-	VPERM2I128 $0x13, AA0, BB0, AA0 // Stream bytes 64 - 95
+	VMOVDQA    Y15, 224(BP)
+	VPADDD     Y14, Y0, Y0
+	VPXOR      Y0, Y4, Y4
+	VPSHUFB    ·rol16<>+0(SB), Y4, Y4
+	VPADDD     Y4, Y12, Y12
+	VPXOR      Y12, Y14, Y14
+	VPSLLD     $0x0c, Y14, Y15
+	VPSRLD     $0x14, Y14, Y14
+	VPXOR      Y15, Y14, Y14
+	VPADDD     Y14, Y0, Y0
+	VPXOR      Y0, Y4, Y4
+	VPSHUFB    ·rol8<>+0(SB), Y4, Y4
+	VPADDD     Y4, Y12, Y12
+	VPXOR      Y12, Y14, Y14
+	VPSLLD     $0x07, Y14, Y15
+	VPSRLD     $0x19, Y14, Y14
+	VPXOR      Y15, Y14, Y14
+	VPADDD     Y9, Y5, Y5
+	VPXOR      Y5, Y1, Y1
+	VPSHUFB    ·rol16<>+0(SB), Y1, Y1
+	VPADDD     Y1, Y13, Y13
+	VPXOR      Y13, Y9, Y9
+	VPSLLD     $0x0c, Y9, Y15
+	VPSRLD     $0x14, Y9, Y9
+	VPXOR      Y15, Y9, Y9
+	VPADDD     Y9, Y5, Y5
+	VPXOR      Y5, Y1, Y1
+	VPSHUFB    ·rol8<>+0(SB), Y1, Y1
+	VPADDD     Y1, Y13, Y13
+	VPXOR      Y13, Y9, Y9
+	VPSLLD     $0x07, Y9, Y15
+	VPSRLD     $0x19, Y9, Y9
+	VPXOR      Y15, Y9, Y9
+	VPADDD     Y10, Y6, Y6
+	VPXOR      Y6, Y2, Y2
+	VPSHUFB    ·rol16<>+0(SB), Y2, Y2
+	VPADDD     Y2, Y8, Y8
+	VPXOR      Y8, Y10, Y10
+	VPSLLD     $0x0c, Y10, Y15
+	VPSRLD     $0x14, Y10, Y10
+	VPXOR      Y15, Y10, Y10
+	VPADDD     Y10, Y6, Y6
+	VPXOR      Y6, Y2, Y2
+	VPSHUFB    ·rol8<>+0(SB), Y2, Y2
+	VPADDD     Y2, Y8, Y8
+	VPXOR      Y8, Y10, Y10
+	VPSLLD     $0x07, Y10, Y15
+	VPSRLD     $0x19, Y10, Y10
+	VPXOR      Y15, Y10, Y10
+	VMOVDQA    224(BP), Y15
+	VMOVDQA    Y13, 224(BP)
+	VPADDD     Y11, Y7, Y7
+	VPXOR      Y7, Y3, Y3
+	VPSHUFB    ·rol16<>+0(SB), Y3, Y3
+	VPADDD     Y3, Y15, Y15
+	VPXOR      Y15, Y11, Y11
+	VPSLLD     $0x0c, Y11, Y13
+	VPSRLD     $0x14, Y11, Y11
+	VPXOR      Y13, Y11, Y11
+	VPADDD     Y11, Y7, Y7
+	VPXOR      Y7, Y3, Y3
+	VPSHUFB    ·rol8<>+0(SB), Y3, Y3
+	VPADDD     Y3, Y15, Y15
+	VPXOR      Y15, Y11, Y11
+	VPSLLD     $0x07, Y11, Y13
+	VPSRLD     $0x19, Y11, Y11
+	VPXOR      Y13, Y11, Y11
+	VMOVDQA    224(BP), Y13
+	VPALIGNR   $0x04, Y14, Y14, Y14
+	VPALIGNR   $0x08, Y12, Y12, Y12
+	VPALIGNR   $0x0c, Y4, Y4, Y4
+	VPALIGNR   $0x04, Y9, Y9, Y9
+	VPALIGNR   $0x08, Y13, Y13, Y13
+	VPALIGNR   $0x0c, Y1, Y1, Y1
+	VPALIGNR   $0x04, Y10, Y10, Y10
+	VPALIGNR   $0x08, Y8, Y8, Y8
+	VPALIGNR   $0x0c, Y2, Y2, Y2
+	VPALIGNR   $0x04, Y11, Y11, Y11
+	VPALIGNR   $0x08, Y15, Y15, Y15
+	VPALIGNR   $0x0c, Y3, Y3, Y3
+	VMOVDQA    Y15, 224(BP)
+	VPADDD     Y14, Y0, Y0
+	VPXOR      Y0, Y4, Y4
+	VPSHUFB    ·rol16<>+0(SB), Y4, Y4
+	VPADDD     Y4, Y12, Y12
+	VPXOR      Y12, Y14, Y14
+	VPSLLD     $0x0c, Y14, Y15
+	VPSRLD     $0x14, Y14, Y14
+	VPXOR      Y15, Y14, Y14
+	VPADDD     Y14, Y0, Y0
+	VPXOR      Y0, Y4, Y4
+	VPSHUFB    ·rol8<>+0(SB), Y4, Y4
+	VPADDD     Y4, Y12, Y12
+	VPXOR      Y12, Y14, Y14
+	VPSLLD     $0x07, Y14, Y15
+	VPSRLD     $0x19, Y14, Y14
+	VPXOR      Y15, Y14, Y14
+	VPADDD     Y9, Y5, Y5
+	VPXOR      Y5, Y1, Y1
+	VPSHUFB    ·rol16<>+0(SB), Y1, Y1
+	VPADDD     Y1, Y13, Y13
+	VPXOR      Y13, Y9, Y9
+	VPSLLD     $0x0c, Y9, Y15
+	VPSRLD     $0x14, Y9, Y9
+	VPXOR      Y15, Y9, Y9
+	VPADDD     Y9, Y5, Y5
+	VPXOR      Y5, Y1, Y1
+	VPSHUFB    ·rol8<>+0(SB), Y1, Y1
+	VPADDD     Y1, Y13, Y13
+	VPXOR      Y13, Y9, Y9
+	VPSLLD     $0x07, Y9, Y15
+	VPSRLD     $0x19, Y9, Y9
+	VPXOR      Y15, Y9, Y9
+	VPADDD     Y10, Y6, Y6
+	VPXOR      Y6, Y2, Y2
+	VPSHUFB    ·rol16<>+0(SB), Y2, Y2
+	VPADDD     Y2, Y8, Y8
+	VPXOR      Y8, Y10, Y10
+	VPSLLD     $0x0c, Y10, Y15
+	VPSRLD     $0x14, Y10, Y10
+	VPXOR      Y15, Y10, Y10
+	VPADDD     Y10, Y6, Y6
+	VPXOR      Y6, Y2, Y2
+	VPSHUFB    ·rol8<>+0(SB), Y2, Y2
+	VPADDD     Y2, Y8, Y8
+	VPXOR      Y8, Y10, Y10
+	VPSLLD     $0x07, Y10, Y15
+	VPSRLD     $0x19, Y10, Y10
+	VPXOR      Y15, Y10, Y10
+	VMOVDQA    224(BP), Y15
+	VMOVDQA    Y13, 224(BP)
+	VPADDD     Y11, Y7, Y7
+	VPXOR      Y7, Y3, Y3
+	VPSHUFB    ·rol16<>+0(SB), Y3, Y3
+	VPADDD     Y3, Y15, Y15
+	VPXOR      Y15, Y11, Y11
+	VPSLLD     $0x0c, Y11, Y13
+	VPSRLD     $0x14, Y11, Y11
+	VPXOR      Y13, Y11, Y11
+	VPADDD     Y11, Y7, Y7
+	VPXOR      Y7, Y3, Y3
+	VPSHUFB    ·rol8<>+0(SB), Y3, Y3
+	VPADDD     Y3, Y15, Y15
+	VPXOR      Y15, Y11, Y11
+	VPSLLD     $0x07, Y11, Y13
+	VPSRLD     $0x19, Y11, Y11
+	VPXOR      Y13, Y11, Y11
+	VMOVDQA    224(BP), Y13
+	VPALIGNR   $0x0c, Y14, Y14, Y14
+	VPALIGNR   $0x08, Y12, Y12, Y12
+	VPALIGNR   $0x04, Y4, Y4, Y4
+	VPALIGNR   $0x0c, Y9, Y9, Y9
+	VPALIGNR   $0x08, Y13, Y13, Y13
+	VPALIGNR   $0x04, Y1, Y1, Y1
+	VPALIGNR   $0x0c, Y10, Y10, Y10
+	VPALIGNR   $0x08, Y8, Y8, Y8
+	VPALIGNR   $0x04, Y2, Y2, Y2
+	VPALIGNR   $0x0c, Y11, Y11, Y11
+	VPALIGNR   $0x08, Y15, Y15, Y15
+	VPALIGNR   $0x04, Y3, Y3, Y3
+	DECQ       R9
+	JNE        sealAVX2IntroLoop
+	VPADDD     ·chacha20Constants<>+0(SB), Y0, Y0
+	VPADDD     ·chacha20Constants<>+0(SB), Y5, Y5
+	VPADDD     ·chacha20Constants<>+0(SB), Y6, Y6
+	VPADDD     ·chacha20Constants<>+0(SB), Y7, Y7
+	VPADDD     32(BP), Y14, Y14
+	VPADDD     32(BP), Y9, Y9
+	VPADDD     32(BP), Y10, Y10
+	VPADDD     32(BP), Y11, Y11
+	VPADDD     64(BP), Y12, Y12
+	VPADDD     64(BP), Y13, Y13
+	VPADDD     64(BP), Y8, Y8
+	VPADDD     64(BP), Y15, Y15
+	VPADDD     96(BP), Y4, Y4
+	VPADDD     128(BP), Y1, Y1
+	VPADDD     160(BP), Y2, Y2
+	VPADDD     192(BP), Y3, Y3
+	VPERM2I128 $0x13, Y12, Y4, Y12
+	VPERM2I128 $0x02, Y0, Y14, Y4
+	VPERM2I128 $0x13, Y0, Y14, Y0
 
 	// Clamp and store poly key
-	VPAND   ·polyClampMask<>(SB), DD0, DD0
-	VMOVDQA DD0, rsStoreAVX2
+	VPAND   ·polyClampMask<>+0(SB), Y4, Y4
+	VMOVDQA Y4, (BP)
 
 	// Hash AD
-	MOVQ ad_len+80(FP), itr2
+	MOVQ ad_len+80(FP), R9
 	CALL polyHashADInternal<>(SB)
 
 	// Can store at least 320 bytes
-	VPXOR   (0*32)(inp), AA0, AA0
-	VPXOR   (1*32)(inp), CC0, CC0
-	VMOVDQU AA0, (0*32)(oup)
-	VMOVDQU CC0, (1*32)(oup)
-
-	VPERM2I128 $0x02, AA1, BB1, AA0; VPERM2I128 $0x02, CC1, DD1, BB0; VPERM2I128 $0x13, AA1, BB1, CC0; VPERM2I128 $0x13, CC1, DD1, DD0
-	VPXOR      (2*32)(inp), AA0, AA0; VPXOR (3*32)(inp), BB0, BB0; VPXOR (4*32)(inp), CC0, CC0; VPXOR (5*32)(inp), DD0, DD0
-	VMOVDQU    AA0, (2*32)(oup); VMOVDQU BB0, (3*32)(oup); VMOVDQU CC0, (4*32)(oup); VMOVDQU DD0, (5*32)(oup)
-	VPERM2I128 $0x02, AA2, BB2, AA0; VPERM2I128 $0x02, CC2, DD2, BB0; VPERM2I128 $0x13, AA2, BB2, CC0; VPERM2I128 $0x13, CC2, DD2, DD0
-	VPXOR      (6*32)(inp), AA0, AA0; VPXOR (7*32)(inp), BB0, BB0; VPXOR (8*32)(inp), CC0, CC0; VPXOR (9*32)(inp), DD0, DD0
-	VMOVDQU    AA0, (6*32)(oup); VMOVDQU BB0, (7*32)(oup); VMOVDQU CC0, (8*32)(oup); VMOVDQU DD0, (9*32)(oup)
-
-	MOVQ $320, itr1
-	SUBQ $320, inl
-	LEAQ 320(inp), inp
-
-	VPERM2I128 $0x02, AA3, BB3, AA0; VPERM2I128 $0x02, CC3, DD3, BB0; VPERM2I128 $0x13, AA3, BB3, CC0; VPERM2I128 $0x13, CC3, DD3, DD0
-	CMPQ       inl, $128
+	VPXOR      (SI), Y0, Y0
+	VPXOR      32(SI), Y12, Y12
+	VMOVDQU    Y0, (DI)
+	VMOVDQU    Y12, 32(DI)
+	VPERM2I128 $0x02, Y5, Y9, Y0
+	VPERM2I128 $0x02, Y13, Y1, Y14
+	VPERM2I128 $0x13, Y5, Y9, Y12
+	VPERM2I128 $0x13, Y13, Y1, Y4
+	VPXOR      64(SI), Y0, Y0
+	VPXOR      96(SI), Y14, Y14
+	VPXOR      128(SI), Y12, Y12
+	VPXOR      160(SI), Y4, Y4
+	VMOVDQU    Y0, 64(DI)
+	VMOVDQU    Y14, 96(DI)
+	VMOVDQU    Y12, 128(DI)
+	VMOVDQU    Y4, 160(DI)
+	VPERM2I128 $0x02, Y6, Y10, Y0
+	VPERM2I128 $0x02, Y8, Y2, Y14
+	VPERM2I128 $0x13, Y6, Y10, Y12
+	VPERM2I128 $0x13, Y8, Y2, Y4
+	VPXOR      192(SI), Y0, Y0
+	VPXOR      224(SI), Y14, Y14
+	VPXOR      256(SI), Y12, Y12
+	VPXOR      288(SI), Y4, Y4
+	VMOVDQU    Y0, 192(DI)
+	VMOVDQU    Y14, 224(DI)
+	VMOVDQU    Y12, 256(DI)
+	VMOVDQU    Y4, 288(DI)
+	MOVQ       $0x00000140, CX
+	SUBQ       $0x00000140, BX
+	LEAQ       320(SI), SI
+	VPERM2I128 $0x02, Y7, Y11, Y0
+	VPERM2I128 $0x02, Y15, Y3, Y14
+	VPERM2I128 $0x13, Y7, Y11, Y12
+	VPERM2I128 $0x13, Y15, Y3, Y4
+	CMPQ       BX, $0x80
 	JBE        sealAVX2SealHash
-
-	VPXOR   (0*32)(inp), AA0, AA0; VPXOR (1*32)(inp), BB0, BB0; VPXOR (2*32)(inp), CC0, CC0; VPXOR (3*32)(inp), DD0, DD0
-	VMOVDQU AA0, (10*32)(oup); VMOVDQU BB0, (11*32)(oup); VMOVDQU CC0, (12*32)(oup); VMOVDQU DD0, (13*32)(oup)
-	SUBQ    $128, inl
-	LEAQ    128(inp), inp
-
-	MOVQ $8, itr1
-	MOVQ $2, itr2
-
-	CMPQ inl, $128
-	JBE  sealAVX2Tail128
-	CMPQ inl, $256
-	JBE  sealAVX2Tail256
-	CMPQ inl, $384
-	JBE  sealAVX2Tail384
-	CMPQ inl, $512
-	JBE  sealAVX2Tail512
+	VPXOR      (SI), Y0, Y0
+	VPXOR      32(SI), Y14, Y14
+	VPXOR      64(SI), Y12, Y12
+	VPXOR      96(SI), Y4, Y4
+	VMOVDQU    Y0, 320(DI)
+	VMOVDQU    Y14, 352(DI)
+	VMOVDQU    Y12, 384(DI)
+	VMOVDQU    Y4, 416(DI)
+	SUBQ       $0x80, BX
+	LEAQ       128(SI), SI
+	MOVQ       $0x00000008, CX
+	MOVQ       $0x00000002, R9
+	CMPQ       BX, $0x80
+	JBE        sealAVX2Tail128
+	CMPQ       BX, $0x00000100
+	JBE        sealAVX2Tail256
+	CMPQ       BX, $0x00000180
+	JBE        sealAVX2Tail384
+	CMPQ       BX, $0x00000200
+	JBE        sealAVX2Tail512
 
 	// We have 448 bytes to hash, but main loop hashes 512 bytes at a time - perform some rounds, before the main loop
-	VMOVDQA ·chacha20Constants<>(SB), AA0; VMOVDQA AA0, AA1; VMOVDQA AA0, AA2; VMOVDQA AA0, AA3
-	VMOVDQA state1StoreAVX2, BB0; VMOVDQA BB0, BB1; VMOVDQA BB0, BB2; VMOVDQA BB0, BB3
-	VMOVDQA state2StoreAVX2, CC0; VMOVDQA CC0, CC1; VMOVDQA CC0, CC2; VMOVDQA CC0, CC3
-	VMOVDQA ctr3StoreAVX2, DD0
-	VPADDD  ·avx2IncMask<>(SB), DD0, DD0; VPADDD ·avx2IncMask<>(SB), DD0, DD1; VPADDD ·avx2IncMask<>(SB), DD1, DD2; VPADDD ·avx2IncMask<>(SB), DD2, DD3
-	VMOVDQA DD0, ctr0StoreAVX2; VMOVDQA DD1, ctr1StoreAVX2; VMOVDQA DD2, ctr2StoreAVX2; VMOVDQA DD3, ctr3StoreAVX2
-
-	VMOVDQA CC3, tmpStoreAVX2
-	chachaQR_AVX2(AA0, BB0, CC0, DD0, CC3); chachaQR_AVX2(AA1, BB1, CC1, DD1, CC3); chachaQR_AVX2(AA2, BB2, CC2, DD2, CC3)
-	VMOVDQA tmpStoreAVX2, CC3
-	VMOVDQA CC1, tmpStoreAVX2
-	chachaQR_AVX2(AA3, BB3, CC3, DD3, CC1)
-	VMOVDQA tmpStoreAVX2, CC1
-
-	VPALIGNR $4, BB0, BB0, BB0; VPALIGNR $8, CC0, CC0, CC0; VPALIGNR $12, DD0, DD0, DD0
-	VPALIGNR $4, BB1, BB1, BB1; VPALIGNR $8, CC1, CC1, CC1; VPALIGNR $12, DD1, DD1, DD1
-	VPALIGNR $4, BB2, BB2, BB2; VPALIGNR $8, CC2, CC2, CC2; VPALIGNR $12, DD2, DD2, DD2
-	VPALIGNR $4, BB3, BB3, BB3; VPALIGNR $8, CC3, CC3, CC3; VPALIGNR $12, DD3, DD3, DD3
-
-	VMOVDQA CC3, tmpStoreAVX2
-	chachaQR_AVX2(AA0, BB0, CC0, DD0, CC3); chachaQR_AVX2(AA1, BB1, CC1, DD1, CC3); chachaQR_AVX2(AA2, BB2, CC2, DD2, CC3)
-	VMOVDQA tmpStoreAVX2, CC3
-	VMOVDQA CC1, tmpStoreAVX2
-	chachaQR_AVX2(AA3, BB3, CC3, DD3, CC1)
-	VMOVDQA tmpStoreAVX2, CC1
-
-	VPALIGNR $12, BB0, BB0, BB0; VPALIGNR $8, CC0, CC0, CC0; VPALIGNR $4, DD0, DD0, DD0
-	VPALIGNR $12, BB1, BB1, BB1; VPALIGNR $8, CC1, CC1, CC1; VPALIGNR $4, DD1, DD1, DD1
-	VPALIGNR $12, BB2, BB2, BB2; VPALIGNR $8, CC2, CC2, CC2; VPALIGNR $4, DD2, DD2, DD2
-	VPALIGNR $12, BB3, BB3, BB3; VPALIGNR $8, CC3, CC3, CC3; VPALIGNR $4, DD3, DD3, DD3
-	VPADDD   BB0, AA0, AA0; VPADDD BB1, AA1, AA1; VPADDD BB2, AA2, AA2; VPADDD BB3, AA3, AA3
-	VPXOR    AA0, DD0, DD0; VPXOR AA1, DD1, DD1; VPXOR AA2, DD2, DD2; VPXOR AA3, DD3, DD3
-	VPSHUFB  ·rol16<>(SB), DD0, DD0; VPSHUFB ·rol16<>(SB), DD1, DD1; VPSHUFB ·rol16<>(SB), DD2, DD2; VPSHUFB ·rol16<>(SB), DD3, DD3
-	VPADDD   DD0, CC0, CC0; VPADDD DD1, CC1, CC1; VPADDD DD2, CC2, CC2; VPADDD DD3, CC3, CC3
-	VPXOR    CC0, BB0, BB0; VPXOR CC1, BB1, BB1; VPXOR CC2, BB2, BB2; VPXOR CC3, BB3, BB3
-	VMOVDQA  CC3, tmpStoreAVX2
-	VPSLLD   $12, BB0, CC3; VPSRLD $20, BB0, BB0; VPXOR CC3, BB0, BB0
-	VPSLLD   $12, BB1, CC3; VPSRLD $20, BB1, BB1; VPXOR CC3, BB1, BB1
-	VPSLLD   $12, BB2, CC3; VPSRLD $20, BB2, BB2; VPXOR CC3, BB2, BB2
-	VPSLLD   $12, BB3, CC3; VPSRLD $20, BB3, BB3; VPXOR CC3, BB3, BB3
-	VMOVDQA  tmpStoreAVX2, CC3
-
-	SUBQ $16, oup                  // Adjust the pointer
-	MOVQ $9, itr1
-	JMP  sealAVX2InternalLoopStart
+	VMOVDQA  ·chacha20Constants<>+0(SB), Y0
+	VMOVDQA  Y0, Y5
+	VMOVDQA  Y0, Y6
+	VMOVDQA  Y0, Y7
+	VMOVDQA  32(BP), Y14
+	VMOVDQA  Y14, Y9
+	VMOVDQA  Y14, Y10
+	VMOVDQA  Y14, Y11
+	VMOVDQA  64(BP), Y12
+	VMOVDQA  Y12, Y13
+	VMOVDQA  Y12, Y8
+	VMOVDQA  Y12, Y15
+	VMOVDQA  192(BP), Y4
+	VPADDD   ·avx2IncMask<>+0(SB), Y4, Y4
+	VPADDD   ·avx2IncMask<>+0(SB), Y4, Y1
+	VPADDD   ·avx2IncMask<>+0(SB), Y1, Y2
+	VPADDD   ·avx2IncMask<>+0(SB), Y2, Y3
+	VMOVDQA  Y4, 96(BP)
+	VMOVDQA  Y1, 128(BP)
+	VMOVDQA  Y2, 160(BP)
+	VMOVDQA  Y3, 192(BP)
+	VMOVDQA  Y15, 224(BP)
+	VPADDD   Y14, Y0, Y0
+	VPXOR    Y0, Y4, Y4
+	VPSHUFB  ·rol16<>+0(SB), Y4, Y4
+	VPADDD   Y4, Y12, Y12
+	VPXOR    Y12, Y14, Y14
+	VPSLLD   $0x0c, Y14, Y15
+	VPSRLD   $0x14, Y14, Y14
+	VPXOR    Y15, Y14, Y14
+	VPADDD   Y14, Y0, Y0
+	VPXOR    Y0, Y4, Y4
+	VPSHUFB  ·rol8<>+0(SB), Y4, Y4
+	VPADDD   Y4, Y12, Y12
+	VPXOR    Y12, Y14, Y14
+	VPSLLD   $0x07, Y14, Y15
+	VPSRLD   $0x19, Y14, Y14
+	VPXOR    Y15, Y14, Y14
+	VPADDD   Y9, Y5, Y5
+	VPXOR    Y5, Y1, Y1
+	VPSHUFB  ·rol16<>+0(SB), Y1, Y1
+	VPADDD   Y1, Y13, Y13
+	VPXOR    Y13, Y9, Y9
+	VPSLLD   $0x0c, Y9, Y15
+	VPSRLD   $0x14, Y9, Y9
+	VPXOR    Y15, Y9, Y9
+	VPADDD   Y9, Y5, Y5
+	VPXOR    Y5, Y1, Y1
+	VPSHUFB  ·rol8<>+0(SB), Y1, Y1
+	VPADDD   Y1, Y13, Y13
+	VPXOR    Y13, Y9, Y9
+	VPSLLD   $0x07, Y9, Y15
+	VPSRLD   $0x19, Y9, Y9
+	VPXOR    Y15, Y9, Y9
+	VPADDD   Y10, Y6, Y6
+	VPXOR    Y6, Y2, Y2
+	VPSHUFB  ·rol16<>+0(SB), Y2, Y2
+	VPADDD   Y2, Y8, Y8
+	VPXOR    Y8, Y10, Y10
+	VPSLLD   $0x0c, Y10, Y15
+	VPSRLD   $0x14, Y10, Y10
+	VPXOR    Y15, Y10, Y10
+	VPADDD   Y10, Y6, Y6
+	VPXOR    Y6, Y2, Y2
+	VPSHUFB  ·rol8<>+0(SB), Y2, Y2
+	VPADDD   Y2, Y8, Y8
+	VPXOR    Y8, Y10, Y10
+	VPSLLD   $0x07, Y10, Y15
+	VPSRLD   $0x19, Y10, Y10
+	VPXOR    Y15, Y10, Y10
+	VMOVDQA  224(BP), Y15
+	VMOVDQA  Y13, 224(BP)
+	VPADDD   Y11, Y7, Y7
+	VPXOR    Y7, Y3, Y3
+	VPSHUFB  ·rol16<>+0(SB), Y3, Y3
+	VPADDD   Y3, Y15, Y15
+	VPXOR    Y15, Y11, Y11
+	VPSLLD   $0x0c, Y11, Y13
+	VPSRLD   $0x14, Y11, Y11
+	VPXOR    Y13, Y11, Y11
+	VPADDD   Y11, Y7, Y7
+	VPXOR    Y7, Y3, Y3
+	VPSHUFB  ·rol8<>+0(SB), Y3, Y3
+	VPADDD   Y3, Y15, Y15
+	VPXOR    Y15, Y11, Y11
+	VPSLLD   $0x07, Y11, Y13
+	VPSRLD   $0x19, Y11, Y11
+	VPXOR    Y13, Y11, Y11
+	VMOVDQA  224(BP), Y13
+	VPALIGNR $0x04, Y14, Y14, Y14
+	VPALIGNR $0x08, Y12, Y12, Y12
+	VPALIGNR $0x0c, Y4, Y4, Y4
+	VPALIGNR $0x04, Y9, Y9, Y9
+	VPALIGNR $0x08, Y13, Y13, Y13
+	VPALIGNR $0x0c, Y1, Y1, Y1
+	VPALIGNR $0x04, Y10, Y10, Y10
+	VPALIGNR $0x08, Y8, Y8, Y8
+	VPALIGNR $0x0c, Y2, Y2, Y2
+	VPALIGNR $0x04, Y11, Y11, Y11
+	VPALIGNR $0x08, Y15, Y15, Y15
+	VPALIGNR $0x0c, Y3, Y3, Y3
+	VMOVDQA  Y15, 224(BP)
+	VPADDD   Y14, Y0, Y0
+	VPXOR    Y0, Y4, Y4
+	VPSHUFB  ·rol16<>+0(SB), Y4, Y4
+	VPADDD   Y4, Y12, Y12
+	VPXOR    Y12, Y14, Y14
+	VPSLLD   $0x0c, Y14, Y15
+	VPSRLD   $0x14, Y14, Y14
+	VPXOR    Y15, Y14, Y14
+	VPADDD   Y14, Y0, Y0
+	VPXOR    Y0, Y4, Y4
+	VPSHUFB  ·rol8<>+0(SB), Y4, Y4
+	VPADDD   Y4, Y12, Y12
+	VPXOR    Y12, Y14, Y14
+	VPSLLD   $0x07, Y14, Y15
+	VPSRLD   $0x19, Y14, Y14
+	VPXOR    Y15, Y14, Y14
+	VPADDD   Y9, Y5, Y5
+	VPXOR    Y5, Y1, Y1
+	VPSHUFB  ·rol16<>+0(SB), Y1, Y1
+	VPADDD   Y1, Y13, Y13
+	VPXOR    Y13, Y9, Y9
+	VPSLLD   $0x0c, Y9, Y15
+	VPSRLD   $0x14, Y9, Y9
+	VPXOR    Y15, Y9, Y9
+	VPADDD   Y9, Y5, Y5
+	VPXOR    Y5, Y1, Y1
+	VPSHUFB  ·rol8<>+0(SB), Y1, Y1
+	VPADDD   Y1, Y13, Y13
+	VPXOR    Y13, Y9, Y9
+	VPSLLD   $0x07, Y9, Y15
+	VPSRLD   $0x19, Y9, Y9
+	VPXOR    Y15, Y9, Y9
+	VPADDD   Y10, Y6, Y6
+	VPXOR    Y6, Y2, Y2
+	VPSHUFB  ·rol16<>+0(SB), Y2, Y2
+	VPADDD   Y2, Y8, Y8
+	VPXOR    Y8, Y10, Y10
+	VPSLLD   $0x0c, Y10, Y15
+	VPSRLD   $0x14, Y10, Y10
+	VPXOR    Y15, Y10, Y10
+	VPADDD   Y10, Y6, Y6
+	VPXOR    Y6, Y2, Y2
+	VPSHUFB  ·rol8<>+0(SB), Y2, Y2
+	VPADDD   Y2, Y8, Y8
+	VPXOR    Y8, Y10, Y10
+	VPSLLD   $0x07, Y10, Y15
+	VPSRLD   $0x19, Y10, Y10
+	VPXOR    Y15, Y10, Y10
+	VMOVDQA  224(BP), Y15
+	VMOVDQA  Y13, 224(BP)
+	VPADDD   Y11, Y7, Y7
+	VPXOR    Y7, Y3, Y3
+	VPSHUFB  ·rol16<>+0(SB), Y3, Y3
+	VPADDD   Y3, Y15, Y15
+	VPXOR    Y15, Y11, Y11
+	VPSLLD   $0x0c, Y11, Y13
+	VPSRLD   $0x14, Y11, Y11
+	VPXOR    Y13, Y11, Y11
+	VPADDD   Y11, Y7, Y7
+	VPXOR    Y7, Y3, Y3
+	VPSHUFB  ·rol8<>+0(SB), Y3, Y3
+	VPADDD   Y3, Y15, Y15
+	VPXOR    Y15, Y11, Y11
+	VPSLLD   $0x07, Y11, Y13
+	VPSRLD   $0x19, Y11, Y11
+	VPXOR    Y13, Y11, Y11
+	VMOVDQA  224(BP), Y13
+	VPALIGNR $0x0c, Y14, Y14, Y14
+	VPALIGNR $0x08, Y12, Y12, Y12
+	VPALIGNR $0x04, Y4, Y4, Y4
+	VPALIGNR $0x0c, Y9, Y9, Y9
+	VPALIGNR $0x08, Y13, Y13, Y13
+	VPALIGNR $0x04, Y1, Y1, Y1
+	VPALIGNR $0x0c, Y10, Y10, Y10
+	VPALIGNR $0x08, Y8, Y8, Y8
+	VPALIGNR $0x04, Y2, Y2, Y2
+	VPALIGNR $0x0c, Y11, Y11, Y11
+	VPALIGNR $0x08, Y15, Y15, Y15
+	VPALIGNR $0x04, Y3, Y3, Y3
+	VPADDD   Y14, Y0, Y0
+	VPADDD   Y9, Y5, Y5
+	VPADDD   Y10, Y6, Y6
+	VPADDD   Y11, Y7, Y7
+	VPXOR    Y0, Y4, Y4
+	VPXOR    Y5, Y1, Y1
+	VPXOR    Y6, Y2, Y2
+	VPXOR    Y7, Y3, Y3
+	VPSHUFB  ·rol16<>+0(SB), Y4, Y4
+	VPSHUFB  ·rol16<>+0(SB), Y1, Y1
+	VPSHUFB  ·rol16<>+0(SB), Y2, Y2
+	VPSHUFB  ·rol16<>+0(SB), Y3, Y3
+	VPADDD   Y4, Y12, Y12
+	VPADDD   Y1, Y13, Y13
+	VPADDD   Y2, Y8, Y8
+	VPADDD   Y3, Y15, Y15
+	VPXOR    Y12, Y14, Y14
+	VPXOR    Y13, Y9, Y9
+	VPXOR    Y8, Y10, Y10
+	VPXOR    Y15, Y11, Y11
+	VMOVDQA  Y15, 224(BP)
+	VPSLLD   $0x0c, Y14, Y15
+	VPSRLD   $0x14, Y14, Y14
+	VPXOR    Y15, Y14, Y14
+	VPSLLD   $0x0c, Y9, Y15
+	VPSRLD   $0x14, Y9, Y9
+	VPXOR    Y15, Y9, Y9
+	VPSLLD   $0x0c, Y10, Y15
+	VPSRLD   $0x14, Y10, Y10
+	VPXOR    Y15, Y10, Y10
+	VPSLLD   $0x0c, Y11, Y15
+	VPSRLD   $0x14, Y11, Y11
+	VPXOR    Y15, Y11, Y11
+	VMOVDQA  224(BP), Y15
+	SUBQ     $0x10, DI
+	MOVQ     $0x00000009, CX
+	JMP      sealAVX2InternalLoopStart
 
 sealAVX2MainLoop:
-	// Load state, increment counter blocks, store the incremented counters
-	VMOVDQU ·chacha20Constants<>(SB), AA0; VMOVDQA AA0, AA1; VMOVDQA AA0, AA2; VMOVDQA AA0, AA3
-	VMOVDQA state1StoreAVX2, BB0; VMOVDQA BB0, BB1; VMOVDQA BB0, BB2; VMOVDQA BB0, BB3
-	VMOVDQA state2StoreAVX2, CC0; VMOVDQA CC0, CC1; VMOVDQA CC0, CC2; VMOVDQA CC0, CC3
-	VMOVDQA ctr3StoreAVX2, DD0; VPADDD ·avx2IncMask<>(SB), DD0, DD0; VPADDD ·avx2IncMask<>(SB), DD0, DD1; VPADDD ·avx2IncMask<>(SB), DD1, DD2; VPADDD ·avx2IncMask<>(SB), DD2, DD3
-	VMOVDQA DD0, ctr0StoreAVX2; VMOVDQA DD1, ctr1StoreAVX2; VMOVDQA DD2, ctr2StoreAVX2; VMOVDQA DD3, ctr3StoreAVX2
-	MOVQ    $10, itr1
+	VMOVDQU ·chacha20Constants<>+0(SB), Y0
+	VMOVDQA Y0, Y5
+	VMOVDQA Y0, Y6
+	VMOVDQA Y0, Y7
+	VMOVDQA 32(BP), Y14
+	VMOVDQA Y14, Y9
+	VMOVDQA Y14, Y10
+	VMOVDQA Y14, Y11
+	VMOVDQA 64(BP), Y12
+	VMOVDQA Y12, Y13
+	VMOVDQA Y12, Y8
+	VMOVDQA Y12, Y15
+	VMOVDQA 192(BP), Y4
+	VPADDD  ·avx2IncMask<>+0(SB), Y4, Y4
+	VPADDD  ·avx2IncMask<>+0(SB), Y4, Y1
+	VPADDD  ·avx2IncMask<>+0(SB), Y1, Y2
+	VPADDD  ·avx2IncMask<>+0(SB), Y2, Y3
+	VMOVDQA Y4, 96(BP)
+	VMOVDQA Y1, 128(BP)
+	VMOVDQA Y2, 160(BP)
+	VMOVDQA Y3, 192(BP)
+	MOVQ    $0x0000000a, CX
 
 sealAVX2InternalLoop:
-	polyAdd(0*8(oup))
-	VPADDD  BB0, AA0, AA0; VPADDD BB1, AA1, AA1; VPADDD BB2, AA2, AA2; VPADDD BB3, AA3, AA3
-	polyMulStage1_AVX2
-	VPXOR   AA0, DD0, DD0; VPXOR AA1, DD1, DD1; VPXOR AA2, DD2, DD2; VPXOR AA3, DD3, DD3
-	VPSHUFB ·rol16<>(SB), DD0, DD0; VPSHUFB ·rol16<>(SB), DD1, DD1; VPSHUFB ·rol16<>(SB), DD2, DD2; VPSHUFB ·rol16<>(SB), DD3, DD3
-	polyMulStage2_AVX2
-	VPADDD  DD0, CC0, CC0; VPADDD DD1, CC1, CC1; VPADDD DD2, CC2, CC2; VPADDD DD3, CC3, CC3
-	VPXOR   CC0, BB0, BB0; VPXOR CC1, BB1, BB1; VPXOR CC2, BB2, BB2; VPXOR CC3, BB3, BB3
-	polyMulStage3_AVX2
-	VMOVDQA CC3, tmpStoreAVX2
-	VPSLLD  $12, BB0, CC3; VPSRLD $20, BB0, BB0; VPXOR CC3, BB0, BB0
-	VPSLLD  $12, BB1, CC3; VPSRLD $20, BB1, BB1; VPXOR CC3, BB1, BB1
-	VPSLLD  $12, BB2, CC3; VPSRLD $20, BB2, BB2; VPXOR CC3, BB2, BB2
-	VPSLLD  $12, BB3, CC3; VPSRLD $20, BB3, BB3; VPXOR CC3, BB3, BB3
-	VMOVDQA tmpStoreAVX2, CC3
-	polyMulReduceStage
+	ADDQ    (DI), R10
+	ADCQ    8(DI), R11
+	ADCQ    $0x01, R12
+	VPADDD  Y14, Y0, Y0
+	VPADDD  Y9, Y5, Y5
+	VPADDD  Y10, Y6, Y6
+	VPADDD  Y11, Y7, Y7
+	MOVQ    (BP), DX
+	MOVQ    DX, R15
+	MULXQ   R10, R13, R14
+	IMULQ   R12, R15
+	MULXQ   R11, AX, DX
+	ADDQ    AX, R14
+	ADCQ    DX, R15
+	VPXOR   Y0, Y4, Y4
+	VPXOR   Y5, Y1, Y1
+	VPXOR   Y6, Y2, Y2
+	VPXOR   Y7, Y3, Y3
+	VPSHUFB ·rol16<>+0(SB), Y4, Y4
+	VPSHUFB ·rol16<>+0(SB), Y1, Y1
+	VPSHUFB ·rol16<>+0(SB), Y2, Y2
+	VPSHUFB ·rol16<>+0(SB), Y3, Y3
+	MOVQ    8(BP), DX
+	MULXQ   R10, R10, AX
+	ADDQ    R10, R14
+	MULXQ   R11, R11, R8
+	ADCQ    R11, R15
+	ADCQ    $0x00, R8
+	VPADDD  Y4, Y12, Y12
+	VPADDD  Y1, Y13, Y13
+	VPADDD  Y2, Y8, Y8
+	VPADDD  Y3, Y15, Y15
+	VPXOR   Y12, Y14, Y14
+	VPXOR   Y13, Y9, Y9
+	VPXOR   Y8, Y10, Y10
+	VPXOR   Y15, Y11, Y11
+	IMULQ   R12, DX
+	ADDQ    AX, R15
+	ADCQ    DX, R8
+	VMOVDQA Y15, 224(BP)
+	VPSLLD  $0x0c, Y14, Y15
+	VPSRLD  $0x14, Y14, Y14
+	VPXOR   Y15, Y14, Y14
+	VPSLLD  $0x0c, Y9, Y15
+	VPSRLD  $0x14, Y9, Y9
+	VPXOR   Y15, Y9, Y9
+	VPSLLD  $0x0c, Y10, Y15
+	VPSRLD  $0x14, Y10, Y10
+	VPXOR   Y15, Y10, Y10
+	VPSLLD  $0x0c, Y11, Y15
+	VPSRLD  $0x14, Y11, Y11
+	VPXOR   Y15, Y11, Y11
+	VMOVDQA 224(BP), Y15
+	MOVQ    R13, R10
+	MOVQ    R14, R11
+	MOVQ    R15, R12
+	ANDQ    $0x03, R12
+	MOVQ    R15, R13
+	ANDQ    $-4, R13
+	MOVQ    R8, R14
+	SHRQ    $0x02, R8, R15
+	SHRQ    $0x02, R8
+	ADDQ    R13, R10
+	ADCQ    R14, R11
+	ADCQ    $0x00, R12
+	ADDQ    R15, R10
+	ADCQ    R8, R11
+	ADCQ    $0x00, R12
 
 sealAVX2InternalLoopStart:
-	VPADDD   BB0, AA0, AA0; VPADDD BB1, AA1, AA1; VPADDD BB2, AA2, AA2; VPADDD BB3, AA3, AA3
-	VPXOR    AA0, DD0, DD0; VPXOR AA1, DD1, DD1; VPXOR AA2, DD2, DD2; VPXOR AA3, DD3, DD3
-	VPSHUFB  ·rol8<>(SB), DD0, DD0; VPSHUFB ·rol8<>(SB), DD1, DD1; VPSHUFB ·rol8<>(SB), DD2, DD2; VPSHUFB ·rol8<>(SB), DD3, DD3
-	polyAdd(2*8(oup))
-	VPADDD   DD0, CC0, CC0; VPADDD DD1, CC1, CC1; VPADDD DD2, CC2, CC2; VPADDD DD3, CC3, CC3
-	polyMulStage1_AVX2
-	VPXOR    CC0, BB0, BB0; VPXOR CC1, BB1, BB1; VPXOR CC2, BB2, BB2; VPXOR CC3, BB3, BB3
-	VMOVDQA  CC3, tmpStoreAVX2
-	VPSLLD   $7, BB0, CC3; VPSRLD $25, BB0, BB0; VPXOR CC3, BB0, BB0
-	VPSLLD   $7, BB1, CC3; VPSRLD $25, BB1, BB1; VPXOR CC3, BB1, BB1
-	VPSLLD   $7, BB2, CC3; VPSRLD $25, BB2, BB2; VPXOR CC3, BB2, BB2
-	VPSLLD   $7, BB3, CC3; VPSRLD $25, BB3, BB3; VPXOR CC3, BB3, BB3
-	VMOVDQA  tmpStoreAVX2, CC3
-	polyMulStage2_AVX2
-	VPALIGNR $4, BB0, BB0, BB0; VPALIGNR $4, BB1, BB1, BB1; VPALIGNR $4, BB2, BB2, BB2; VPALIGNR $4, BB3, BB3, BB3
-	VPALIGNR $8, CC0, CC0, CC0; VPALIGNR $8, CC1, CC1, CC1; VPALIGNR $8, CC2, CC2, CC2; VPALIGNR $8, CC3, CC3, CC3
-	VPALIGNR $12, DD0, DD0, DD0; VPALIGNR $12, DD1, DD1, DD1; VPALIGNR $12, DD2, DD2, DD2; VPALIGNR $12, DD3, DD3, DD3
-	VPADDD   BB0, AA0, AA0; VPADDD BB1, AA1, AA1; VPADDD BB2, AA2, AA2; VPADDD BB3, AA3, AA3
-	polyMulStage3_AVX2
-	VPXOR    AA0, DD0, DD0; VPXOR AA1, DD1, DD1; VPXOR AA2, DD2, DD2; VPXOR AA3, DD3, DD3
-	VPSHUFB  ·rol16<>(SB), DD0, DD0; VPSHUFB ·rol16<>(SB), DD1, DD1; VPSHUFB ·rol16<>(SB), DD2, DD2; VPSHUFB ·rol16<>(SB), DD3, DD3
-	polyMulReduceStage
-	VPADDD   DD0, CC0, CC0; VPADDD DD1, CC1, CC1; VPADDD DD2, CC2, CC2; VPADDD DD3, CC3, CC3
-	VPXOR    CC0, BB0, BB0; VPXOR CC1, BB1, BB1; VPXOR CC2, BB2, BB2; VPXOR CC3, BB3, BB3
-	polyAdd(4*8(oup))
-	LEAQ     (6*8)(oup), oup
-	VMOVDQA  CC3, tmpStoreAVX2
-	VPSLLD   $12, BB0, CC3; VPSRLD $20, BB0, BB0; VPXOR CC3, BB0, BB0
-	VPSLLD   $12, BB1, CC3; VPSRLD $20, BB1, BB1; VPXOR CC3, BB1, BB1
-	VPSLLD   $12, BB2, CC3; VPSRLD $20, BB2, BB2; VPXOR CC3, BB2, BB2
-	VPSLLD   $12, BB3, CC3; VPSRLD $20, BB3, BB3; VPXOR CC3, BB3, BB3
-	VMOVDQA  tmpStoreAVX2, CC3
-	polyMulStage1_AVX2
-	VPADDD   BB0, AA0, AA0; VPADDD BB1, AA1, AA1; VPADDD BB2, AA2, AA2; VPADDD BB3, AA3, AA3
-	VPXOR    AA0, DD0, DD0; VPXOR AA1, DD1, DD1; VPXOR AA2, DD2, DD2; VPXOR AA3, DD3, DD3
-	polyMulStage2_AVX2
-	VPSHUFB  ·rol8<>(SB), DD0, DD0; VPSHUFB ·rol8<>(SB), DD1, DD1; VPSHUFB ·rol8<>(SB), DD2, DD2; VPSHUFB ·rol8<>(SB), DD3, DD3
-	VPADDD   DD0, CC0, CC0; VPADDD DD1, CC1, CC1; VPADDD DD2, CC2, CC2; VPADDD DD3, CC3, CC3
-	polyMulStage3_AVX2
-	VPXOR    CC0, BB0, BB0; VPXOR CC1, BB1, BB1; VPXOR CC2, BB2, BB2; VPXOR CC3, BB3, BB3
-	VMOVDQA  CC3, tmpStoreAVX2
-	VPSLLD   $7, BB0, CC3; VPSRLD $25, BB0, BB0; VPXOR CC3, BB0, BB0
-	VPSLLD   $7, BB1, CC3; VPSRLD $25, BB1, BB1; VPXOR CC3, BB1, BB1
-	VPSLLD   $7, BB2, CC3; VPSRLD $25, BB2, BB2; VPXOR CC3, BB2, BB2
-	VPSLLD   $7, BB3, CC3; VPSRLD $25, BB3, BB3; VPXOR CC3, BB3, BB3
-	VMOVDQA  tmpStoreAVX2, CC3
-	polyMulReduceStage
-	VPALIGNR $12, BB0, BB0, BB0; VPALIGNR $12, BB1, BB1, BB1; VPALIGNR $12, BB2, BB2, BB2; VPALIGNR $12, BB3, BB3, BB3
-	VPALIGNR $8, CC0, CC0, CC0; VPALIGNR $8, CC1, CC1, CC1; VPALIGNR $8, CC2, CC2, CC2; VPALIGNR $8, CC3, CC3, CC3
-	VPALIGNR $4, DD0, DD0, DD0; VPALIGNR $4, DD1, DD1, DD1; VPALIGNR $4, DD2, DD2, DD2; VPALIGNR $4, DD3, DD3, DD3
-	DECQ     itr1
+	VPADDD   Y14, Y0, Y0
+	VPADDD   Y9, Y5, Y5
+	VPADDD   Y10, Y6, Y6
+	VPADDD   Y11, Y7, Y7
+	VPXOR    Y0, Y4, Y4
+	VPXOR    Y5, Y1, Y1
+	VPXOR    Y6, Y2, Y2
+	VPXOR    Y7, Y3, Y3
+	VPSHUFB  ·rol8<>+0(SB), Y4, Y4
+	VPSHUFB  ·rol8<>+0(SB), Y1, Y1
+	VPSHUFB  ·rol8<>+0(SB), Y2, Y2
+	VPSHUFB  ·rol8<>+0(SB), Y3, Y3
+	ADDQ     16(DI), R10
+	ADCQ     24(DI), R11
+	ADCQ     $0x01, R12
+	VPADDD   Y4, Y12, Y12
+	VPADDD   Y1, Y13, Y13
+	VPADDD   Y2, Y8, Y8
+	VPADDD   Y3, Y15, Y15
+	MOVQ     (BP), DX
+	MOVQ     DX, R15
+	MULXQ    R10, R13, R14
+	IMULQ    R12, R15
+	MULXQ    R11, AX, DX
+	ADDQ     AX, R14
+	ADCQ     DX, R15
+	VPXOR    Y12, Y14, Y14
+	VPXOR    Y13, Y9, Y9
+	VPXOR    Y8, Y10, Y10
+	VPXOR    Y15, Y11, Y11
+	VMOVDQA  Y15, 224(BP)
+	VPSLLD   $0x07, Y14, Y15
+	VPSRLD   $0x19, Y14, Y14
+	VPXOR    Y15, Y14, Y14
+	VPSLLD   $0x07, Y9, Y15
+	VPSRLD   $0x19, Y9, Y9
+	VPXOR    Y15, Y9, Y9
+	VPSLLD   $0x07, Y10, Y15
+	VPSRLD   $0x19, Y10, Y10
+	VPXOR    Y15, Y10, Y10
+	VPSLLD   $0x07, Y11, Y15
+	VPSRLD   $0x19, Y11, Y11
+	VPXOR    Y15, Y11, Y11
+	VMOVDQA  224(BP), Y15
+	MOVQ     8(BP), DX
+	MULXQ    R10, R10, AX
+	ADDQ     R10, R14
+	MULXQ    R11, R11, R8
+	ADCQ     R11, R15
+	ADCQ     $0x00, R8
+	VPALIGNR $0x04, Y14, Y14, Y14
+	VPALIGNR $0x04, Y9, Y9, Y9
+	VPALIGNR $0x04, Y10, Y10, Y10
+	VPALIGNR $0x04, Y11, Y11, Y11
+	VPALIGNR $0x08, Y12, Y12, Y12
+	VPALIGNR $0x08, Y13, Y13, Y13
+	VPALIGNR $0x08, Y8, Y8, Y8
+	VPALIGNR $0x08, Y15, Y15, Y15
+	VPALIGNR $0x0c, Y4, Y4, Y4
+	VPALIGNR $0x0c, Y1, Y1, Y1
+	VPALIGNR $0x0c, Y2, Y2, Y2
+	VPALIGNR $0x0c, Y3, Y3, Y3
+	VPADDD   Y14, Y0, Y0
+	VPADDD   Y9, Y5, Y5
+	VPADDD   Y10, Y6, Y6
+	VPADDD   Y11, Y7, Y7
+	IMULQ    R12, DX
+	ADDQ     AX, R15
+	ADCQ     DX, R8
+	VPXOR    Y0, Y4, Y4
+	VPXOR    Y5, Y1, Y1
+	VPXOR    Y6, Y2, Y2
+	VPXOR    Y7, Y3, Y3
+	VPSHUFB  ·rol16<>+0(SB), Y4, Y4
+	VPSHUFB  ·rol16<>+0(SB), Y1, Y1
+	VPSHUFB  ·rol16<>+0(SB), Y2, Y2
+	VPSHUFB  ·rol16<>+0(SB), Y3, Y3
+	MOVQ     R13, R10
+	MOVQ     R14, R11
+	MOVQ     R15, R12
+	ANDQ     $0x03, R12
+	MOVQ     R15, R13
+	ANDQ     $-4, R13
+	MOVQ     R8, R14
+	SHRQ     $0x02, R8, R15
+	SHRQ     $0x02, R8
+	ADDQ     R13, R10
+	ADCQ     R14, R11
+	ADCQ     $0x00, R12
+	ADDQ     R15, R10
+	ADCQ     R8, R11
+	ADCQ     $0x00, R12
+	VPADDD   Y4, Y12, Y12
+	VPADDD   Y1, Y13, Y13
+	VPADDD   Y2, Y8, Y8
+	VPADDD   Y3, Y15, Y15
+	VPXOR    Y12, Y14, Y14
+	VPXOR    Y13, Y9, Y9
+	VPXOR    Y8, Y10, Y10
+	VPXOR    Y15, Y11, Y11
+	ADDQ     32(DI), R10
+	ADCQ     40(DI), R11
+	ADCQ     $0x01, R12
+	LEAQ     48(DI), DI
+	VMOVDQA  Y15, 224(BP)
+	VPSLLD   $0x0c, Y14, Y15
+	VPSRLD   $0x14, Y14, Y14
+	VPXOR    Y15, Y14, Y14
+	VPSLLD   $0x0c, Y9, Y15
+	VPSRLD   $0x14, Y9, Y9
+	VPXOR    Y15, Y9, Y9
+	VPSLLD   $0x0c, Y10, Y15
+	VPSRLD   $0x14, Y10, Y10
+	VPXOR    Y15, Y10, Y10
+	VPSLLD   $0x0c, Y11, Y15
+	VPSRLD   $0x14, Y11, Y11
+	VPXOR    Y15, Y11, Y11
+	VMOVDQA  224(BP), Y15
+	MOVQ     (BP), DX
+	MOVQ     DX, R15
+	MULXQ    R10, R13, R14
+	IMULQ    R12, R15
+	MULXQ    R11, AX, DX
+	ADDQ     AX, R14
+	ADCQ     DX, R15
+	VPADDD   Y14, Y0, Y0
+	VPADDD   Y9, Y5, Y5
+	VPADDD   Y10, Y6, Y6
+	VPADDD   Y11, Y7, Y7
+	VPXOR    Y0, Y4, Y4
+	VPXOR    Y5, Y1, Y1
+	VPXOR    Y6, Y2, Y2
+	VPXOR    Y7, Y3, Y3
+	MOVQ     8(BP), DX
+	MULXQ    R10, R10, AX
+	ADDQ     R10, R14
+	MULXQ    R11, R11, R8
+	ADCQ     R11, R15
+	ADCQ     $0x00, R8
+	VPSHUFB  ·rol8<>+0(SB), Y4, Y4
+	VPSHUFB  ·rol8<>+0(SB), Y1, Y1
+	VPSHUFB  ·rol8<>+0(SB), Y2, Y2
+	VPSHUFB  ·rol8<>+0(SB), Y3, Y3
+	VPADDD   Y4, Y12, Y12
+	VPADDD   Y1, Y13, Y13
+	VPADDD   Y2, Y8, Y8
+	VPADDD   Y3, Y15, Y15
+	IMULQ    R12, DX
+	ADDQ     AX, R15
+	ADCQ     DX, R8
+	VPXOR    Y12, Y14, Y14
+	VPXOR    Y13, Y9, Y9
+	VPXOR    Y8, Y10, Y10
+	VPXOR    Y15, Y11, Y11
+	VMOVDQA  Y15, 224(BP)
+	VPSLLD   $0x07, Y14, Y15
+	VPSRLD   $0x19, Y14, Y14
+	VPXOR    Y15, Y14, Y14
+	VPSLLD   $0x07, Y9, Y15
+	VPSRLD   $0x19, Y9, Y9
+	VPXOR    Y15, Y9, Y9
+	VPSLLD   $0x07, Y10, Y15
+	VPSRLD   $0x19, Y10, Y10
+	VPXOR    Y15, Y10, Y10
+	VPSLLD   $0x07, Y11, Y15
+	VPSRLD   $0x19, Y11, Y11
+	VPXOR    Y15, Y11, Y11
+	VMOVDQA  224(BP), Y15
+	MOVQ     R13, R10
+	MOVQ     R14, R11
+	MOVQ     R15, R12
+	ANDQ     $0x03, R12
+	MOVQ     R15, R13
+	ANDQ     $-4, R13
+	MOVQ     R8, R14
+	SHRQ     $0x02, R8, R15
+	SHRQ     $0x02, R8
+	ADDQ     R13, R10
+	ADCQ     R14, R11
+	ADCQ     $0x00, R12
+	ADDQ     R15, R10
+	ADCQ     R8, R11
+	ADCQ     $0x00, R12
+	VPALIGNR $0x0c, Y14, Y14, Y14
+	VPALIGNR $0x0c, Y9, Y9, Y9
+	VPALIGNR $0x0c, Y10, Y10, Y10
+	VPALIGNR $0x0c, Y11, Y11, Y11
+	VPALIGNR $0x08, Y12, Y12, Y12
+	VPALIGNR $0x08, Y13, Y13, Y13
+	VPALIGNR $0x08, Y8, Y8, Y8
+	VPALIGNR $0x08, Y15, Y15, Y15
+	VPALIGNR $0x04, Y4, Y4, Y4
+	VPALIGNR $0x04, Y1, Y1, Y1
+	VPALIGNR $0x04, Y2, Y2, Y2
+	VPALIGNR $0x04, Y3, Y3, Y3
+	DECQ     CX
 	JNE      sealAVX2InternalLoop
-
-	VPADDD  ·chacha20Constants<>(SB), AA0, AA0; VPADDD ·chacha20Constants<>(SB), AA1, AA1; VPADDD ·chacha20Constants<>(SB), AA2, AA2; VPADDD ·chacha20Constants<>(SB), AA3, AA3
-	VPADDD  state1StoreAVX2, BB0, BB0; VPADDD state1StoreAVX2, BB1, BB1; VPADDD state1StoreAVX2, BB2, BB2; VPADDD state1StoreAVX2, BB3, BB3
-	VPADDD  state2StoreAVX2, CC0, CC0; VPADDD state2StoreAVX2, CC1, CC1; VPADDD state2StoreAVX2, CC2, CC2; VPADDD state2StoreAVX2, CC3, CC3
-	VPADDD  ctr0StoreAVX2, DD0, DD0; VPADDD ctr1StoreAVX2, DD1, DD1; VPADDD ctr2StoreAVX2, DD2, DD2; VPADDD ctr3StoreAVX2, DD3, DD3
-	VMOVDQA CC3, tmpStoreAVX2
+	VPADDD   ·chacha20Constants<>+0(SB), Y0, Y0
+	VPADDD   ·chacha20Constants<>+0(SB), Y5, Y5
+	VPADDD   ·chacha20Constants<>+0(SB), Y6, Y6
+	VPADDD   ·chacha20Constants<>+0(SB), Y7, Y7
+	VPADDD   32(BP), Y14, Y14
+	VPADDD   32(BP), Y9, Y9
+	VPADDD   32(BP), Y10, Y10
+	VPADDD   32(BP), Y11, Y11
+	VPADDD   64(BP), Y12, Y12
+	VPADDD   64(BP), Y13, Y13
+	VPADDD   64(BP), Y8, Y8
+	VPADDD   64(BP), Y15, Y15
+	VPADDD   96(BP), Y4, Y4
+	VPADDD   128(BP), Y1, Y1
+	VPADDD   160(BP), Y2, Y2
+	VPADDD   192(BP), Y3, Y3
+	VMOVDQA  Y15, 224(BP)
 
 	// We only hashed 480 of the 512 bytes available - hash the remaining 32 here
-	polyAdd(0*8(oup))
-	polyMulAVX2
-	LEAQ       (4*8)(oup), oup
-	VPERM2I128 $0x02, AA0, BB0, CC3; VPERM2I128 $0x13, AA0, BB0, BB0; VPERM2I128 $0x02, CC0, DD0, AA0; VPERM2I128 $0x13, CC0, DD0, CC0
-	VPXOR      (0*32)(inp), CC3, CC3; VPXOR (1*32)(inp), AA0, AA0; VPXOR (2*32)(inp), BB0, BB0; VPXOR (3*32)(inp), CC0, CC0
-	VMOVDQU    CC3, (0*32)(oup); VMOVDQU AA0, (1*32)(oup); VMOVDQU BB0, (2*32)(oup); VMOVDQU CC0, (3*32)(oup)
-	VPERM2I128 $0x02, AA1, BB1, AA0; VPERM2I128 $0x02, CC1, DD1, BB0; VPERM2I128 $0x13, AA1, BB1, CC0; VPERM2I128 $0x13, CC1, DD1, DD0
-	VPXOR      (4*32)(inp), AA0, AA0; VPXOR (5*32)(inp), BB0, BB0; VPXOR (6*32)(inp), CC0, CC0; VPXOR (7*32)(inp), DD0, DD0
-	VMOVDQU    AA0, (4*32)(oup); VMOVDQU BB0, (5*32)(oup); VMOVDQU CC0, (6*32)(oup); VMOVDQU DD0, (7*32)(oup)
+	ADDQ       (DI), R10
+	ADCQ       8(DI), R11
+	ADCQ       $0x01, R12
+	MOVQ       (BP), DX
+	MOVQ       DX, R15
+	MULXQ      R10, R13, R14
+	IMULQ      R12, R15
+	MULXQ      R11, AX, DX
+	ADDQ       AX, R14
+	ADCQ       DX, R15
+	MOVQ       8(BP), DX
+	MULXQ      R10, R10, AX
+	ADDQ       R10, R14
+	MULXQ      R11, R11, R8
+	ADCQ       R11, R15
+	ADCQ       $0x00, R8
+	IMULQ      R12, DX
+	ADDQ       AX, R15
+	ADCQ       DX, R8
+	MOVQ       R13, R10
+	MOVQ       R14, R11
+	MOVQ       R15, R12
+	ANDQ       $0x03, R12
+	MOVQ       R15, R13
+	ANDQ       $-4, R13
+	MOVQ       R8, R14
+	SHRQ       $0x02, R8, R15
+	SHRQ       $0x02, R8
+	ADDQ       R13, R10
+	ADCQ       R14, R11
+	ADCQ       $0x00, R12
+	ADDQ       R15, R10
+	ADCQ       R8, R11
+	ADCQ       $0x00, R12
+	LEAQ       32(DI), DI
+	VPERM2I128 $0x02, Y0, Y14, Y15
+	VPERM2I128 $0x13, Y0, Y14, Y14
+	VPERM2I128 $0x02, Y12, Y4, Y0
+	VPERM2I128 $0x13, Y12, Y4, Y12
+	VPXOR      (SI), Y15, Y15
+	VPXOR      32(SI), Y0, Y0
+	VPXOR      64(SI), Y14, Y14
+	VPXOR      96(SI), Y12, Y12
+	VMOVDQU    Y15, (DI)
+	VMOVDQU    Y0, 32(DI)
+	VMOVDQU    Y14, 64(DI)
+	VMOVDQU    Y12, 96(DI)
+	VPERM2I128 $0x02, Y5, Y9, Y0
+	VPERM2I128 $0x02, Y13, Y1, Y14
+	VPERM2I128 $0x13, Y5, Y9, Y12
+	VPERM2I128 $0x13, Y13, Y1, Y4
+	VPXOR      128(SI), Y0, Y0
+	VPXOR      160(SI), Y14, Y14
+	VPXOR      192(SI), Y12, Y12
+	VPXOR      224(SI), Y4, Y4
+	VMOVDQU    Y0, 128(DI)
+	VMOVDQU    Y14, 160(DI)
+	VMOVDQU    Y12, 192(DI)
+	VMOVDQU    Y4, 224(DI)
 
 	// and here
-	polyAdd(-2*8(oup))
-	polyMulAVX2
-	VPERM2I128 $0x02, AA2, BB2, AA0; VPERM2I128 $0x02, CC2, DD2, BB0; VPERM2I128 $0x13, AA2, BB2, CC0; VPERM2I128 $0x13, CC2, DD2, DD0
-	VPXOR      (8*32)(inp), AA0, AA0; VPXOR (9*32)(inp), BB0, BB0; VPXOR (10*32)(inp), CC0, CC0; VPXOR (11*32)(inp), DD0, DD0
-	VMOVDQU    AA0, (8*32)(oup); VMOVDQU BB0, (9*32)(oup); VMOVDQU CC0, (10*32)(oup); VMOVDQU DD0, (11*32)(oup)
-	VPERM2I128 $0x02, AA3, BB3, AA0; VPERM2I128 $0x02, tmpStoreAVX2, DD3, BB0; VPERM2I128 $0x13, AA3, BB3, CC0; VPERM2I128 $0x13, tmpStoreAVX2, DD3, DD0
-	VPXOR      (12*32)(inp), AA0, AA0; VPXOR (13*32)(inp), BB0, BB0; VPXOR (14*32)(inp), CC0, CC0; VPXOR (15*32)(inp), DD0, DD0
-	VMOVDQU    AA0, (12*32)(oup); VMOVDQU BB0, (13*32)(oup); VMOVDQU CC0, (14*32)(oup); VMOVDQU DD0, (15*32)(oup)
-	LEAQ       (32*16)(inp), inp
-	SUBQ       $(32*16), inl
-	CMPQ       inl, $512
+	ADDQ       -16(DI), R10
+	ADCQ       -8(DI), R11
+	ADCQ       $0x01, R12
+	MOVQ       (BP), DX
+	MOVQ       DX, R15
+	MULXQ      R10, R13, R14
+	IMULQ      R12, R15
+	MULXQ      R11, AX, DX
+	ADDQ       AX, R14
+	ADCQ       DX, R15
+	MOVQ       8(BP), DX
+	MULXQ      R10, R10, AX
+	ADDQ       R10, R14
+	MULXQ      R11, R11, R8
+	ADCQ       R11, R15
+	ADCQ       $0x00, R8
+	IMULQ      R12, DX
+	ADDQ       AX, R15
+	ADCQ       DX, R8
+	MOVQ       R13, R10
+	MOVQ       R14, R11
+	MOVQ       R15, R12
+	ANDQ       $0x03, R12
+	MOVQ       R15, R13
+	ANDQ       $-4, R13
+	MOVQ       R8, R14
+	SHRQ       $0x02, R8, R15
+	SHRQ       $0x02, R8
+	ADDQ       R13, R10
+	ADCQ       R14, R11
+	ADCQ       $0x00, R12
+	ADDQ       R15, R10
+	ADCQ       R8, R11
+	ADCQ       $0x00, R12
+	VPERM2I128 $0x02, Y6, Y10, Y0
+	VPERM2I128 $0x02, Y8, Y2, Y14
+	VPERM2I128 $0x13, Y6, Y10, Y12
+	VPERM2I128 $0x13, Y8, Y2, Y4
+	VPXOR      256(SI), Y0, Y0
+	VPXOR      288(SI), Y14, Y14
+	VPXOR      320(SI), Y12, Y12
+	VPXOR      352(SI), Y4, Y4
+	VMOVDQU    Y0, 256(DI)
+	VMOVDQU    Y14, 288(DI)
+	VMOVDQU    Y12, 320(DI)
+	VMOVDQU    Y4, 352(DI)
+	VPERM2I128 $0x02, Y7, Y11, Y0
+	VPERM2I128 $0x02, 224(BP), Y3, Y14
+	VPERM2I128 $0x13, Y7, Y11, Y12
+	VPERM2I128 $0x13, 224(BP), Y3, Y4
+	VPXOR      384(SI), Y0, Y0
+	VPXOR      416(SI), Y14, Y14
+	VPXOR      448(SI), Y12, Y12
+	VPXOR      480(SI), Y4, Y4
+	VMOVDQU    Y0, 384(DI)
+	VMOVDQU    Y14, 416(DI)
+	VMOVDQU    Y12, 448(DI)
+	VMOVDQU    Y4, 480(DI)
+	LEAQ       512(SI), SI
+	SUBQ       $0x00000200, BX
+	CMPQ       BX, $0x00000200
 	JG         sealAVX2MainLoop
 
 	// Tail can only hash 480 bytes
-	polyAdd(0*8(oup))
-	polyMulAVX2
-	polyAdd(2*8(oup))
-	polyMulAVX2
-	LEAQ 32(oup), oup
+	ADDQ  (DI), R10
+	ADCQ  8(DI), R11
+	ADCQ  $0x01, R12
+	MOVQ  (BP), DX
+	MOVQ  DX, R15
+	MULXQ R10, R13, R14
+	IMULQ R12, R15
+	MULXQ R11, AX, DX
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), DX
+	MULXQ R10, R10, AX
+	ADDQ  R10, R14
+	MULXQ R11, R11, R8
+	ADCQ  R11, R15
+	ADCQ  $0x00, R8
+	IMULQ R12, DX
+	ADDQ  AX, R15
+	ADCQ  DX, R8
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
+	ADDQ  16(DI), R10
+	ADCQ  24(DI), R11
+	ADCQ  $0x01, R12
+	MOVQ  (BP), DX
+	MOVQ  DX, R15
+	MULXQ R10, R13, R14
+	IMULQ R12, R15
+	MULXQ R11, AX, DX
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), DX
+	MULXQ R10, R10, AX
+	ADDQ  R10, R14
+	MULXQ R11, R11, R8
+	ADCQ  R11, R15
+	ADCQ  $0x00, R8
+	IMULQ R12, DX
+	ADDQ  AX, R15
+	ADCQ  DX, R8
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
+	LEAQ  32(DI), DI
+	MOVQ  $0x0000000a, CX
+	MOVQ  $0x00000000, R9
+	CMPQ  BX, $0x80
+	JBE   sealAVX2Tail128
+	CMPQ  BX, $0x00000100
+	JBE   sealAVX2Tail256
+	CMPQ  BX, $0x00000180
+	JBE   sealAVX2Tail384
+	JMP   sealAVX2Tail512
 
-	MOVQ $10, itr1
-	MOVQ $0, itr2
-	CMPQ inl, $128
-	JBE  sealAVX2Tail128
-	CMPQ inl, $256
-	JBE  sealAVX2Tail256
-	CMPQ inl, $384
-	JBE  sealAVX2Tail384
-	JMP  sealAVX2Tail512
-
-// ----------------------------------------------------------------------------
-// Special optimization for buffers smaller than 193 bytes
 seal192AVX2:
-	// For up to 192 bytes of ciphertext and 64 bytes for the poly key, we process four blocks
-	VMOVDQA AA0, AA1
-	VMOVDQA BB0, BB1
-	VMOVDQA CC0, CC1
-	VPADDD  ·avx2IncMask<>(SB), DD0, DD1
-	VMOVDQA AA0, AA2
-	VMOVDQA BB0, BB2
-	VMOVDQA CC0, CC2
-	VMOVDQA DD0, DD2
-	VMOVDQA DD1, TT3
-	MOVQ    $10, itr2
+	VMOVDQA Y0, Y5
+	VMOVDQA Y14, Y9
+	VMOVDQA Y12, Y13
+	VPADDD  ·avx2IncMask<>+0(SB), Y4, Y1
+	VMOVDQA Y0, Y6
+	VMOVDQA Y14, Y10
+	VMOVDQA Y12, Y8
+	VMOVDQA Y4, Y2
+	VMOVDQA Y1, Y15
+	MOVQ    $0x0000000a, R9
 
 sealAVX2192InnerCipherLoop:
-	chachaQR_AVX2(AA0, BB0, CC0, DD0, TT0); chachaQR_AVX2(AA1, BB1, CC1, DD1, TT0)
-	VPALIGNR   $4, BB0, BB0, BB0; VPALIGNR $4, BB1, BB1, BB1
-	VPALIGNR   $8, CC0, CC0, CC0; VPALIGNR $8, CC1, CC1, CC1
-	VPALIGNR   $12, DD0, DD0, DD0; VPALIGNR $12, DD1, DD1, DD1
-	chachaQR_AVX2(AA0, BB0, CC0, DD0, TT0); chachaQR_AVX2(AA1, BB1, CC1, DD1, TT0)
-	VPALIGNR   $12, BB0, BB0, BB0; VPALIGNR $12, BB1, BB1, BB1
-	VPALIGNR   $8, CC0, CC0, CC0; VPALIGNR $8, CC1, CC1, CC1
-	VPALIGNR   $4, DD0, DD0, DD0; VPALIGNR $4, DD1, DD1, DD1
-	DECQ       itr2
+	VPADDD     Y14, Y0, Y0
+	VPXOR      Y0, Y4, Y4
+	VPSHUFB    ·rol16<>+0(SB), Y4, Y4
+	VPADDD     Y4, Y12, Y12
+	VPXOR      Y12, Y14, Y14
+	VPSLLD     $0x0c, Y14, Y3
+	VPSRLD     $0x14, Y14, Y14
+	VPXOR      Y3, Y14, Y14
+	VPADDD     Y14, Y0, Y0
+	VPXOR      Y0, Y4, Y4
+	VPSHUFB    ·rol8<>+0(SB), Y4, Y4
+	VPADDD     Y4, Y12, Y12
+	VPXOR      Y12, Y14, Y14
+	VPSLLD     $0x07, Y14, Y3
+	VPSRLD     $0x19, Y14, Y14
+	VPXOR      Y3, Y14, Y14
+	VPADDD     Y9, Y5, Y5
+	VPXOR      Y5, Y1, Y1
+	VPSHUFB    ·rol16<>+0(SB), Y1, Y1
+	VPADDD     Y1, Y13, Y13
+	VPXOR      Y13, Y9, Y9
+	VPSLLD     $0x0c, Y9, Y3
+	VPSRLD     $0x14, Y9, Y9
+	VPXOR      Y3, Y9, Y9
+	VPADDD     Y9, Y5, Y5
+	VPXOR      Y5, Y1, Y1
+	VPSHUFB    ·rol8<>+0(SB), Y1, Y1
+	VPADDD     Y1, Y13, Y13
+	VPXOR      Y13, Y9, Y9
+	VPSLLD     $0x07, Y9, Y3
+	VPSRLD     $0x19, Y9, Y9
+	VPXOR      Y3, Y9, Y9
+	VPALIGNR   $0x04, Y14, Y14, Y14
+	VPALIGNR   $0x04, Y9, Y9, Y9
+	VPALIGNR   $0x08, Y12, Y12, Y12
+	VPALIGNR   $0x08, Y13, Y13, Y13
+	VPALIGNR   $0x0c, Y4, Y4, Y4
+	VPALIGNR   $0x0c, Y1, Y1, Y1
+	VPADDD     Y14, Y0, Y0
+	VPXOR      Y0, Y4, Y4
+	VPSHUFB    ·rol16<>+0(SB), Y4, Y4
+	VPADDD     Y4, Y12, Y12
+	VPXOR      Y12, Y14, Y14
+	VPSLLD     $0x0c, Y14, Y3
+	VPSRLD     $0x14, Y14, Y14
+	VPXOR      Y3, Y14, Y14
+	VPADDD     Y14, Y0, Y0
+	VPXOR      Y0, Y4, Y4
+	VPSHUFB    ·rol8<>+0(SB), Y4, Y4
+	VPADDD     Y4, Y12, Y12
+	VPXOR      Y12, Y14, Y14
+	VPSLLD     $0x07, Y14, Y3
+	VPSRLD     $0x19, Y14, Y14
+	VPXOR      Y3, Y14, Y14
+	VPADDD     Y9, Y5, Y5
+	VPXOR      Y5, Y1, Y1
+	VPSHUFB    ·rol16<>+0(SB), Y1, Y1
+	VPADDD     Y1, Y13, Y13
+	VPXOR      Y13, Y9, Y9
+	VPSLLD     $0x0c, Y9, Y3
+	VPSRLD     $0x14, Y9, Y9
+	VPXOR      Y3, Y9, Y9
+	VPADDD     Y9, Y5, Y5
+	VPXOR      Y5, Y1, Y1
+	VPSHUFB    ·rol8<>+0(SB), Y1, Y1
+	VPADDD     Y1, Y13, Y13
+	VPXOR      Y13, Y9, Y9
+	VPSLLD     $0x07, Y9, Y3
+	VPSRLD     $0x19, Y9, Y9
+	VPXOR      Y3, Y9, Y9
+	VPALIGNR   $0x0c, Y14, Y14, Y14
+	VPALIGNR   $0x0c, Y9, Y9, Y9
+	VPALIGNR   $0x08, Y12, Y12, Y12
+	VPALIGNR   $0x08, Y13, Y13, Y13
+	VPALIGNR   $0x04, Y4, Y4, Y4
+	VPALIGNR   $0x04, Y1, Y1, Y1
+	DECQ       R9
 	JNE        sealAVX2192InnerCipherLoop
-	VPADDD     AA2, AA0, AA0; VPADDD AA2, AA1, AA1
-	VPADDD     BB2, BB0, BB0; VPADDD BB2, BB1, BB1
-	VPADDD     CC2, CC0, CC0; VPADDD CC2, CC1, CC1
-	VPADDD     DD2, DD0, DD0; VPADDD TT3, DD1, DD1
-	VPERM2I128 $0x02, AA0, BB0, TT0
+	VPADDD     Y6, Y0, Y0
+	VPADDD     Y6, Y5, Y5
+	VPADDD     Y10, Y14, Y14
+	VPADDD     Y10, Y9, Y9
+	VPADDD     Y8, Y12, Y12
+	VPADDD     Y8, Y13, Y13
+	VPADDD     Y2, Y4, Y4
+	VPADDD     Y15, Y1, Y1
+	VPERM2I128 $0x02, Y0, Y14, Y3
 
 	// Clamp and store poly key
-	VPAND   ·polyClampMask<>(SB), TT0, TT0
-	VMOVDQA TT0, rsStoreAVX2
+	VPAND   ·polyClampMask<>+0(SB), Y3, Y3
+	VMOVDQA Y3, (BP)
 
 	// Stream for up to 192 bytes
-	VPERM2I128 $0x13, AA0, BB0, AA0
-	VPERM2I128 $0x13, CC0, DD0, BB0
-	VPERM2I128 $0x02, AA1, BB1, CC0
-	VPERM2I128 $0x02, CC1, DD1, DD0
-	VPERM2I128 $0x13, AA1, BB1, AA1
-	VPERM2I128 $0x13, CC1, DD1, BB1
+	VPERM2I128 $0x13, Y0, Y14, Y0
+	VPERM2I128 $0x13, Y12, Y4, Y14
+	VPERM2I128 $0x02, Y5, Y9, Y12
+	VPERM2I128 $0x02, Y13, Y1, Y4
+	VPERM2I128 $0x13, Y5, Y9, Y5
+	VPERM2I128 $0x13, Y13, Y1, Y9
 
 sealAVX2ShortSeal:
 	// Hash aad
-	MOVQ ad_len+80(FP), itr2
+	MOVQ ad_len+80(FP), R9
 	CALL polyHashADInternal<>(SB)
-	XORQ itr1, itr1
+	XORQ CX, CX
 
 sealAVX2SealHash:
 	// itr1 holds the number of bytes encrypted but not yet hashed
-	CMPQ itr1, $16
-	JB   sealAVX2ShortSealLoop
-	polyAdd(0(oup))
-	polyMul
-	SUBQ $16, itr1
-	ADDQ $16, oup
-	JMP  sealAVX2SealHash
+	CMPQ  CX, $0x10
+	JB    sealAVX2ShortSealLoop
+	ADDQ  (DI), R10
+	ADCQ  8(DI), R11
+	ADCQ  $0x01, R12
+	MOVQ  (BP), AX
+	MOVQ  AX, R15
+	MULQ  R10
+	MOVQ  AX, R13
+	MOVQ  DX, R14
+	MOVQ  (BP), AX
+	MULQ  R11
+	IMULQ R12, R15
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), AX
+	MOVQ  AX, R8
+	MULQ  R10
+	ADDQ  AX, R14
+	ADCQ  $0x00, DX
+	MOVQ  DX, R10
+	MOVQ  8(BP), AX
+	MULQ  R11
+	ADDQ  AX, R15
+	ADCQ  $0x00, DX
+	IMULQ R12, R8
+	ADDQ  R10, R15
+	ADCQ  DX, R8
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
+	SUBQ  $0x10, CX
+	ADDQ  $0x10, DI
+	JMP   sealAVX2SealHash
 
 sealAVX2ShortSealLoop:
-	CMPQ inl, $32
+	CMPQ BX, $0x20
 	JB   sealAVX2ShortTail32
-	SUBQ $32, inl
+	SUBQ $0x20, BX
 
 	// Load for encryption
-	VPXOR   (inp), AA0, AA0
-	VMOVDQU AA0, (oup)
-	LEAQ    (1*32)(inp), inp
+	VPXOR   (SI), Y0, Y0
+	VMOVDQU Y0, (DI)
+	LEAQ    32(SI), SI
 
 	// Now can hash
-	polyAdd(0*8(oup))
-	polyMulAVX2
-	polyAdd(2*8(oup))
-	polyMulAVX2
-	LEAQ (1*32)(oup), oup
+	ADDQ  (DI), R10
+	ADCQ  8(DI), R11
+	ADCQ  $0x01, R12
+	MOVQ  (BP), DX
+	MOVQ  DX, R15
+	MULXQ R10, R13, R14
+	IMULQ R12, R15
+	MULXQ R11, AX, DX
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), DX
+	MULXQ R10, R10, AX
+	ADDQ  R10, R14
+	MULXQ R11, R11, R8
+	ADCQ  R11, R15
+	ADCQ  $0x00, R8
+	IMULQ R12, DX
+	ADDQ  AX, R15
+	ADCQ  DX, R8
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
+	ADDQ  16(DI), R10
+	ADCQ  24(DI), R11
+	ADCQ  $0x01, R12
+	MOVQ  (BP), DX
+	MOVQ  DX, R15
+	MULXQ R10, R13, R14
+	IMULQ R12, R15
+	MULXQ R11, AX, DX
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), DX
+	MULXQ R10, R10, AX
+	ADDQ  R10, R14
+	MULXQ R11, R11, R8
+	ADCQ  R11, R15
+	ADCQ  $0x00, R8
+	IMULQ R12, DX
+	ADDQ  AX, R15
+	ADCQ  DX, R8
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
+	LEAQ  32(DI), DI
 
 	// Shift stream left
-	VMOVDQA BB0, AA0
-	VMOVDQA CC0, BB0
-	VMOVDQA DD0, CC0
-	VMOVDQA AA1, DD0
-	VMOVDQA BB1, AA1
-	VMOVDQA CC1, BB1
-	VMOVDQA DD1, CC1
-	VMOVDQA AA2, DD1
-	VMOVDQA BB2, AA2
+	VMOVDQA Y14, Y0
+	VMOVDQA Y12, Y14
+	VMOVDQA Y4, Y12
+	VMOVDQA Y5, Y4
+	VMOVDQA Y9, Y5
+	VMOVDQA Y13, Y9
+	VMOVDQA Y1, Y13
+	VMOVDQA Y6, Y1
+	VMOVDQA Y10, Y6
 	JMP     sealAVX2ShortSealLoop
 
 sealAVX2ShortTail32:
-	CMPQ    inl, $16
-	VMOVDQA A0, A1
+	CMPQ    BX, $0x10
+	VMOVDQA X0, X1
 	JB      sealAVX2ShortDone
-
-	SUBQ $16, inl
+	SUBQ    $0x10, BX
 
 	// Load for encryption
-	VPXOR   (inp), A0, T0
-	VMOVDQU T0, (oup)
-	LEAQ    (1*16)(inp), inp
+	VPXOR   (SI), X0, X12
+	VMOVDQU X12, (DI)
+	LEAQ    16(SI), SI
 
 	// Hash
-	polyAdd(0*8(oup))
-	polyMulAVX2
-	LEAQ       (1*16)(oup), oup
-	VPERM2I128 $0x11, AA0, AA0, AA0
-	VMOVDQA    A0, A1
+	ADDQ       (DI), R10
+	ADCQ       8(DI), R11
+	ADCQ       $0x01, R12
+	MOVQ       (BP), DX
+	MOVQ       DX, R15
+	MULXQ      R10, R13, R14
+	IMULQ      R12, R15
+	MULXQ      R11, AX, DX
+	ADDQ       AX, R14
+	ADCQ       DX, R15
+	MOVQ       8(BP), DX
+	MULXQ      R10, R10, AX
+	ADDQ       R10, R14
+	MULXQ      R11, R11, R8
+	ADCQ       R11, R15
+	ADCQ       $0x00, R8
+	IMULQ      R12, DX
+	ADDQ       AX, R15
+	ADCQ       DX, R8
+	MOVQ       R13, R10
+	MOVQ       R14, R11
+	MOVQ       R15, R12
+	ANDQ       $0x03, R12
+	MOVQ       R15, R13
+	ANDQ       $-4, R13
+	MOVQ       R8, R14
+	SHRQ       $0x02, R8, R15
+	SHRQ       $0x02, R8
+	ADDQ       R13, R10
+	ADCQ       R14, R11
+	ADCQ       $0x00, R12
+	ADDQ       R15, R10
+	ADCQ       R8, R11
+	ADCQ       $0x00, R12
+	LEAQ       16(DI), DI
+	VPERM2I128 $0x11, Y0, Y0, Y0
+	VMOVDQA    X0, X1
 
 sealAVX2ShortDone:
 	VZEROUPPER
 	JMP sealSSETail
 
-// ----------------------------------------------------------------------------
-// Special optimization for buffers smaller than 321 bytes
 seal320AVX2:
-	// For up to 320 bytes of ciphertext and 64 bytes for the poly key, we process six blocks
-	VMOVDQA AA0, AA1; VMOVDQA BB0, BB1; VMOVDQA CC0, CC1; VPADDD ·avx2IncMask<>(SB), DD0, DD1
-	VMOVDQA AA0, AA2; VMOVDQA BB0, BB2; VMOVDQA CC0, CC2; VPADDD ·avx2IncMask<>(SB), DD1, DD2
-	VMOVDQA BB0, TT1; VMOVDQA CC0, TT2; VMOVDQA DD0, TT3
-	MOVQ    $10, itr2
+	VMOVDQA Y0, Y5
+	VMOVDQA Y14, Y9
+	VMOVDQA Y12, Y13
+	VPADDD  ·avx2IncMask<>+0(SB), Y4, Y1
+	VMOVDQA Y0, Y6
+	VMOVDQA Y14, Y10
+	VMOVDQA Y12, Y8
+	VPADDD  ·avx2IncMask<>+0(SB), Y1, Y2
+	VMOVDQA Y14, Y7
+	VMOVDQA Y12, Y11
+	VMOVDQA Y4, Y15
+	MOVQ    $0x0000000a, R9
 
 sealAVX2320InnerCipherLoop:
-	chachaQR_AVX2(AA0, BB0, CC0, DD0, TT0); chachaQR_AVX2(AA1, BB1, CC1, DD1, TT0); chachaQR_AVX2(AA2, BB2, CC2, DD2, TT0)
-	VPALIGNR $4, BB0, BB0, BB0; VPALIGNR $4, BB1, BB1, BB1; VPALIGNR $4, BB2, BB2, BB2
-	VPALIGNR $8, CC0, CC0, CC0; VPALIGNR $8, CC1, CC1, CC1; VPALIGNR $8, CC2, CC2, CC2
-	VPALIGNR $12, DD0, DD0, DD0; VPALIGNR $12, DD1, DD1, DD1; VPALIGNR $12, DD2, DD2, DD2
-	chachaQR_AVX2(AA0, BB0, CC0, DD0, TT0); chachaQR_AVX2(AA1, BB1, CC1, DD1, TT0); chachaQR_AVX2(AA2, BB2, CC2, DD2, TT0)
-	VPALIGNR $12, BB0, BB0, BB0; VPALIGNR $12, BB1, BB1, BB1; VPALIGNR $12, BB2, BB2, BB2
-	VPALIGNR $8, CC0, CC0, CC0; VPALIGNR $8, CC1, CC1, CC1; VPALIGNR $8, CC2, CC2, CC2
-	VPALIGNR $4, DD0, DD0, DD0; VPALIGNR $4, DD1, DD1, DD1; VPALIGNR $4, DD2, DD2, DD2
-	DECQ     itr2
+	VPADDD   Y14, Y0, Y0
+	VPXOR    Y0, Y4, Y4
+	VPSHUFB  ·rol16<>+0(SB), Y4, Y4
+	VPADDD   Y4, Y12, Y12
+	VPXOR    Y12, Y14, Y14
+	VPSLLD   $0x0c, Y14, Y3
+	VPSRLD   $0x14, Y14, Y14
+	VPXOR    Y3, Y14, Y14
+	VPADDD   Y14, Y0, Y0
+	VPXOR    Y0, Y4, Y4
+	VPSHUFB  ·rol8<>+0(SB), Y4, Y4
+	VPADDD   Y4, Y12, Y12
+	VPXOR    Y12, Y14, Y14
+	VPSLLD   $0x07, Y14, Y3
+	VPSRLD   $0x19, Y14, Y14
+	VPXOR    Y3, Y14, Y14
+	VPADDD   Y9, Y5, Y5
+	VPXOR    Y5, Y1, Y1
+	VPSHUFB  ·rol16<>+0(SB), Y1, Y1
+	VPADDD   Y1, Y13, Y13
+	VPXOR    Y13, Y9, Y9
+	VPSLLD   $0x0c, Y9, Y3
+	VPSRLD   $0x14, Y9, Y9
+	VPXOR    Y3, Y9, Y9
+	VPADDD   Y9, Y5, Y5
+	VPXOR    Y5, Y1, Y1
+	VPSHUFB  ·rol8<>+0(SB), Y1, Y1
+	VPADDD   Y1, Y13, Y13
+	VPXOR    Y13, Y9, Y9
+	VPSLLD   $0x07, Y9, Y3
+	VPSRLD   $0x19, Y9, Y9
+	VPXOR    Y3, Y9, Y9
+	VPADDD   Y10, Y6, Y6
+	VPXOR    Y6, Y2, Y2
+	VPSHUFB  ·rol16<>+0(SB), Y2, Y2
+	VPADDD   Y2, Y8, Y8
+	VPXOR    Y8, Y10, Y10
+	VPSLLD   $0x0c, Y10, Y3
+	VPSRLD   $0x14, Y10, Y10
+	VPXOR    Y3, Y10, Y10
+	VPADDD   Y10, Y6, Y6
+	VPXOR    Y6, Y2, Y2
+	VPSHUFB  ·rol8<>+0(SB), Y2, Y2
+	VPADDD   Y2, Y8, Y8
+	VPXOR    Y8, Y10, Y10
+	VPSLLD   $0x07, Y10, Y3
+	VPSRLD   $0x19, Y10, Y10
+	VPXOR    Y3, Y10, Y10
+	VPALIGNR $0x04, Y14, Y14, Y14
+	VPALIGNR $0x04, Y9, Y9, Y9
+	VPALIGNR $0x04, Y10, Y10, Y10
+	VPALIGNR $0x08, Y12, Y12, Y12
+	VPALIGNR $0x08, Y13, Y13, Y13
+	VPALIGNR $0x08, Y8, Y8, Y8
+	VPALIGNR $0x0c, Y4, Y4, Y4
+	VPALIGNR $0x0c, Y1, Y1, Y1
+	VPALIGNR $0x0c, Y2, Y2, Y2
+	VPADDD   Y14, Y0, Y0
+	VPXOR    Y0, Y4, Y4
+	VPSHUFB  ·rol16<>+0(SB), Y4, Y4
+	VPADDD   Y4, Y12, Y12
+	VPXOR    Y12, Y14, Y14
+	VPSLLD   $0x0c, Y14, Y3
+	VPSRLD   $0x14, Y14, Y14
+	VPXOR    Y3, Y14, Y14
+	VPADDD   Y14, Y0, Y0
+	VPXOR    Y0, Y4, Y4
+	VPSHUFB  ·rol8<>+0(SB), Y4, Y4
+	VPADDD   Y4, Y12, Y12
+	VPXOR    Y12, Y14, Y14
+	VPSLLD   $0x07, Y14, Y3
+	VPSRLD   $0x19, Y14, Y14
+	VPXOR    Y3, Y14, Y14
+	VPADDD   Y9, Y5, Y5
+	VPXOR    Y5, Y1, Y1
+	VPSHUFB  ·rol16<>+0(SB), Y1, Y1
+	VPADDD   Y1, Y13, Y13
+	VPXOR    Y13, Y9, Y9
+	VPSLLD   $0x0c, Y9, Y3
+	VPSRLD   $0x14, Y9, Y9
+	VPXOR    Y3, Y9, Y9
+	VPADDD   Y9, Y5, Y5
+	VPXOR    Y5, Y1, Y1
+	VPSHUFB  ·rol8<>+0(SB), Y1, Y1
+	VPADDD   Y1, Y13, Y13
+	VPXOR    Y13, Y9, Y9
+	VPSLLD   $0x07, Y9, Y3
+	VPSRLD   $0x19, Y9, Y9
+	VPXOR    Y3, Y9, Y9
+	VPADDD   Y10, Y6, Y6
+	VPXOR    Y6, Y2, Y2
+	VPSHUFB  ·rol16<>+0(SB), Y2, Y2
+	VPADDD   Y2, Y8, Y8
+	VPXOR    Y8, Y10, Y10
+	VPSLLD   $0x0c, Y10, Y3
+	VPSRLD   $0x14, Y10, Y10
+	VPXOR    Y3, Y10, Y10
+	VPADDD   Y10, Y6, Y6
+	VPXOR    Y6, Y2, Y2
+	VPSHUFB  ·rol8<>+0(SB), Y2, Y2
+	VPADDD   Y2, Y8, Y8
+	VPXOR    Y8, Y10, Y10
+	VPSLLD   $0x07, Y10, Y3
+	VPSRLD   $0x19, Y10, Y10
+	VPXOR    Y3, Y10, Y10
+	VPALIGNR $0x0c, Y14, Y14, Y14
+	VPALIGNR $0x0c, Y9, Y9, Y9
+	VPALIGNR $0x0c, Y10, Y10, Y10
+	VPALIGNR $0x08, Y12, Y12, Y12
+	VPALIGNR $0x08, Y13, Y13, Y13
+	VPALIGNR $0x08, Y8, Y8, Y8
+	VPALIGNR $0x04, Y4, Y4, Y4
+	VPALIGNR $0x04, Y1, Y1, Y1
+	VPALIGNR $0x04, Y2, Y2, Y2
+	DECQ     R9
 	JNE      sealAVX2320InnerCipherLoop
-
-	VMOVDQA ·chacha20Constants<>(SB), TT0
-	VPADDD  TT0, AA0, AA0; VPADDD TT0, AA1, AA1; VPADDD TT0, AA2, AA2
-	VPADDD  TT1, BB0, BB0; VPADDD TT1, BB1, BB1; VPADDD TT1, BB2, BB2
-	VPADDD  TT2, CC0, CC0; VPADDD TT2, CC1, CC1; VPADDD TT2, CC2, CC2
-	VMOVDQA ·avx2IncMask<>(SB), TT0
-	VPADDD  TT3, DD0, DD0; VPADDD TT0, TT3, TT3
-	VPADDD  TT3, DD1, DD1; VPADDD TT0, TT3, TT3
-	VPADDD  TT3, DD2, DD2
+	VMOVDQA  ·chacha20Constants<>+0(SB), Y3
+	VPADDD   Y3, Y0, Y0
+	VPADDD   Y3, Y5, Y5
+	VPADDD   Y3, Y6, Y6
+	VPADDD   Y7, Y14, Y14
+	VPADDD   Y7, Y9, Y9
+	VPADDD   Y7, Y10, Y10
+	VPADDD   Y11, Y12, Y12
+	VPADDD   Y11, Y13, Y13
+	VPADDD   Y11, Y8, Y8
+	VMOVDQA  ·avx2IncMask<>+0(SB), Y3
+	VPADDD   Y15, Y4, Y4
+	VPADDD   Y3, Y15, Y15
+	VPADDD   Y15, Y1, Y1
+	VPADDD   Y3, Y15, Y15
+	VPADDD   Y15, Y2, Y2
 
 	// Clamp and store poly key
-	VPERM2I128 $0x02, AA0, BB0, TT0
-	VPAND      ·polyClampMask<>(SB), TT0, TT0
-	VMOVDQA    TT0, rsStoreAVX2
+	VPERM2I128 $0x02, Y0, Y14, Y3
+	VPAND      ·polyClampMask<>+0(SB), Y3, Y3
+	VMOVDQA    Y3, (BP)
 
 	// Stream for up to 320 bytes
-	VPERM2I128 $0x13, AA0, BB0, AA0
-	VPERM2I128 $0x13, CC0, DD0, BB0
-	VPERM2I128 $0x02, AA1, BB1, CC0
-	VPERM2I128 $0x02, CC1, DD1, DD0
-	VPERM2I128 $0x13, AA1, BB1, AA1
-	VPERM2I128 $0x13, CC1, DD1, BB1
-	VPERM2I128 $0x02, AA2, BB2, CC1
-	VPERM2I128 $0x02, CC2, DD2, DD1
-	VPERM2I128 $0x13, AA2, BB2, AA2
-	VPERM2I128 $0x13, CC2, DD2, BB2
+	VPERM2I128 $0x13, Y0, Y14, Y0
+	VPERM2I128 $0x13, Y12, Y4, Y14
+	VPERM2I128 $0x02, Y5, Y9, Y12
+	VPERM2I128 $0x02, Y13, Y1, Y4
+	VPERM2I128 $0x13, Y5, Y9, Y5
+	VPERM2I128 $0x13, Y13, Y1, Y9
+	VPERM2I128 $0x02, Y6, Y10, Y13
+	VPERM2I128 $0x02, Y8, Y2, Y1
+	VPERM2I128 $0x13, Y6, Y10, Y6
+	VPERM2I128 $0x13, Y8, Y2, Y10
 	JMP        sealAVX2ShortSeal
 
-// ----------------------------------------------------------------------------
-// Special optimization for the last 128 bytes of ciphertext
 sealAVX2Tail128:
-	// Need to decrypt up to 128 bytes - prepare two blocks
-	// If we got here after the main loop - there are 512 encrypted bytes waiting to be hashed
-	// If we got here before the main loop - there are 448 encrpyred bytes waiting to be hashed
-	VMOVDQA ·chacha20Constants<>(SB), AA0
-	VMOVDQA state1StoreAVX2, BB0
-	VMOVDQA state2StoreAVX2, CC0
-	VMOVDQA ctr3StoreAVX2, DD0
-	VPADDD  ·avx2IncMask<>(SB), DD0, DD0
-	VMOVDQA DD0, DD1
+	VMOVDQA ·chacha20Constants<>+0(SB), Y0
+	VMOVDQA 32(BP), Y14
+	VMOVDQA 64(BP), Y12
+	VMOVDQA 192(BP), Y4
+	VPADDD  ·avx2IncMask<>+0(SB), Y4, Y4
+	VMOVDQA Y4, Y1
 
 sealAVX2Tail128LoopA:
-	polyAdd(0(oup))
-	polyMul
-	LEAQ 16(oup), oup
+	ADDQ  (DI), R10
+	ADCQ  8(DI), R11
+	ADCQ  $0x01, R12
+	MOVQ  (BP), AX
+	MOVQ  AX, R15
+	MULQ  R10
+	MOVQ  AX, R13
+	MOVQ  DX, R14
+	MOVQ  (BP), AX
+	MULQ  R11
+	IMULQ R12, R15
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), AX
+	MOVQ  AX, R8
+	MULQ  R10
+	ADDQ  AX, R14
+	ADCQ  $0x00, DX
+	MOVQ  DX, R10
+	MOVQ  8(BP), AX
+	MULQ  R11
+	ADDQ  AX, R15
+	ADCQ  $0x00, DX
+	IMULQ R12, R8
+	ADDQ  R10, R15
+	ADCQ  DX, R8
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
+	LEAQ  16(DI), DI
 
 sealAVX2Tail128LoopB:
-	chachaQR_AVX2(AA0, BB0, CC0, DD0, TT0)
-	polyAdd(0(oup))
-	polyMul
-	VPALIGNR $4, BB0, BB0, BB0
-	VPALIGNR $8, CC0, CC0, CC0
-	VPALIGNR $12, DD0, DD0, DD0
-	chachaQR_AVX2(AA0, BB0, CC0, DD0, TT0)
-	polyAdd(16(oup))
-	polyMul
-	LEAQ     32(oup), oup
-	VPALIGNR $12, BB0, BB0, BB0
-	VPALIGNR $8, CC0, CC0, CC0
-	VPALIGNR $4, DD0, DD0, DD0
-	DECQ     itr1
-	JG       sealAVX2Tail128LoopA
-	DECQ     itr2
-	JGE      sealAVX2Tail128LoopB
-
-	VPADDD ·chacha20Constants<>(SB), AA0, AA1
-	VPADDD state1StoreAVX2, BB0, BB1
-	VPADDD state2StoreAVX2, CC0, CC1
-	VPADDD DD1, DD0, DD1
-
-	VPERM2I128 $0x02, AA1, BB1, AA0
-	VPERM2I128 $0x02, CC1, DD1, BB0
-	VPERM2I128 $0x13, AA1, BB1, CC0
-	VPERM2I128 $0x13, CC1, DD1, DD0
+	VPADDD     Y14, Y0, Y0
+	VPXOR      Y0, Y4, Y4
+	VPSHUFB    ·rol16<>+0(SB), Y4, Y4
+	VPADDD     Y4, Y12, Y12
+	VPXOR      Y12, Y14, Y14
+	VPSLLD     $0x0c, Y14, Y3
+	VPSRLD     $0x14, Y14, Y14
+	VPXOR      Y3, Y14, Y14
+	VPADDD     Y14, Y0, Y0
+	VPXOR      Y0, Y4, Y4
+	VPSHUFB    ·rol8<>+0(SB), Y4, Y4
+	VPADDD     Y4, Y12, Y12
+	VPXOR      Y12, Y14, Y14
+	VPSLLD     $0x07, Y14, Y3
+	VPSRLD     $0x19, Y14, Y14
+	VPXOR      Y3, Y14, Y14
+	ADDQ       (DI), R10
+	ADCQ       8(DI), R11
+	ADCQ       $0x01, R12
+	MOVQ       (BP), AX
+	MOVQ       AX, R15
+	MULQ       R10
+	MOVQ       AX, R13
+	MOVQ       DX, R14
+	MOVQ       (BP), AX
+	MULQ       R11
+	IMULQ      R12, R15
+	ADDQ       AX, R14
+	ADCQ       DX, R15
+	MOVQ       8(BP), AX
+	MOVQ       AX, R8
+	MULQ       R10
+	ADDQ       AX, R14
+	ADCQ       $0x00, DX
+	MOVQ       DX, R10
+	MOVQ       8(BP), AX
+	MULQ       R11
+	ADDQ       AX, R15
+	ADCQ       $0x00, DX
+	IMULQ      R12, R8
+	ADDQ       R10, R15
+	ADCQ       DX, R8
+	MOVQ       R13, R10
+	MOVQ       R14, R11
+	MOVQ       R15, R12
+	ANDQ       $0x03, R12
+	MOVQ       R15, R13
+	ANDQ       $-4, R13
+	MOVQ       R8, R14
+	SHRQ       $0x02, R8, R15
+	SHRQ       $0x02, R8
+	ADDQ       R13, R10
+	ADCQ       R14, R11
+	ADCQ       $0x00, R12
+	ADDQ       R15, R10
+	ADCQ       R8, R11
+	ADCQ       $0x00, R12
+	VPALIGNR   $0x04, Y14, Y14, Y14
+	VPALIGNR   $0x08, Y12, Y12, Y12
+	VPALIGNR   $0x0c, Y4, Y4, Y4
+	VPADDD     Y14, Y0, Y0
+	VPXOR      Y0, Y4, Y4
+	VPSHUFB    ·rol16<>+0(SB), Y4, Y4
+	VPADDD     Y4, Y12, Y12
+	VPXOR      Y12, Y14, Y14
+	VPSLLD     $0x0c, Y14, Y3
+	VPSRLD     $0x14, Y14, Y14
+	VPXOR      Y3, Y14, Y14
+	VPADDD     Y14, Y0, Y0
+	VPXOR      Y0, Y4, Y4
+	VPSHUFB    ·rol8<>+0(SB), Y4, Y4
+	VPADDD     Y4, Y12, Y12
+	VPXOR      Y12, Y14, Y14
+	VPSLLD     $0x07, Y14, Y3
+	VPSRLD     $0x19, Y14, Y14
+	VPXOR      Y3, Y14, Y14
+	ADDQ       16(DI), R10
+	ADCQ       24(DI), R11
+	ADCQ       $0x01, R12
+	MOVQ       (BP), AX
+	MOVQ       AX, R15
+	MULQ       R10
+	MOVQ       AX, R13
+	MOVQ       DX, R14
+	MOVQ       (BP), AX
+	MULQ       R11
+	IMULQ      R12, R15
+	ADDQ       AX, R14
+	ADCQ       DX, R15
+	MOVQ       8(BP), AX
+	MOVQ       AX, R8
+	MULQ       R10
+	ADDQ       AX, R14
+	ADCQ       $0x00, DX
+	MOVQ       DX, R10
+	MOVQ       8(BP), AX
+	MULQ       R11
+	ADDQ       AX, R15
+	ADCQ       $0x00, DX
+	IMULQ      R12, R8
+	ADDQ       R10, R15
+	ADCQ       DX, R8
+	MOVQ       R13, R10
+	MOVQ       R14, R11
+	MOVQ       R15, R12
+	ANDQ       $0x03, R12
+	MOVQ       R15, R13
+	ANDQ       $-4, R13
+	MOVQ       R8, R14
+	SHRQ       $0x02, R8, R15
+	SHRQ       $0x02, R8
+	ADDQ       R13, R10
+	ADCQ       R14, R11
+	ADCQ       $0x00, R12
+	ADDQ       R15, R10
+	ADCQ       R8, R11
+	ADCQ       $0x00, R12
+	LEAQ       32(DI), DI
+	VPALIGNR   $0x0c, Y14, Y14, Y14
+	VPALIGNR   $0x08, Y12, Y12, Y12
+	VPALIGNR   $0x04, Y4, Y4, Y4
+	DECQ       CX
+	JG         sealAVX2Tail128LoopA
+	DECQ       R9
+	JGE        sealAVX2Tail128LoopB
+	VPADDD     ·chacha20Constants<>+0(SB), Y0, Y5
+	VPADDD     32(BP), Y14, Y9
+	VPADDD     64(BP), Y12, Y13
+	VPADDD     Y1, Y4, Y1
+	VPERM2I128 $0x02, Y5, Y9, Y0
+	VPERM2I128 $0x02, Y13, Y1, Y14
+	VPERM2I128 $0x13, Y5, Y9, Y12
+	VPERM2I128 $0x13, Y13, Y1, Y4
 	JMP        sealAVX2ShortSealLoop
 
-// ----------------------------------------------------------------------------
-// Special optimization for the last 256 bytes of ciphertext
 sealAVX2Tail256:
-	// Need to decrypt up to 256 bytes - prepare two blocks
-	// If we got here after the main loop - there are 512 encrypted bytes waiting to be hashed
-	// If we got here before the main loop - there are 448 encrpyred bytes waiting to be hashed
-	VMOVDQA ·chacha20Constants<>(SB), AA0; VMOVDQA ·chacha20Constants<>(SB), AA1
-	VMOVDQA state1StoreAVX2, BB0; VMOVDQA state1StoreAVX2, BB1
-	VMOVDQA state2StoreAVX2, CC0; VMOVDQA state2StoreAVX2, CC1
-	VMOVDQA ctr3StoreAVX2, DD0
-	VPADDD  ·avx2IncMask<>(SB), DD0, DD0
-	VPADDD  ·avx2IncMask<>(SB), DD0, DD1
-	VMOVDQA DD0, TT1
-	VMOVDQA DD1, TT2
+	VMOVDQA ·chacha20Constants<>+0(SB), Y0
+	VMOVDQA ·chacha20Constants<>+0(SB), Y5
+	VMOVDQA 32(BP), Y14
+	VMOVDQA 32(BP), Y9
+	VMOVDQA 64(BP), Y12
+	VMOVDQA 64(BP), Y13
+	VMOVDQA 192(BP), Y4
+	VPADDD  ·avx2IncMask<>+0(SB), Y4, Y4
+	VPADDD  ·avx2IncMask<>+0(SB), Y4, Y1
+	VMOVDQA Y4, Y7
+	VMOVDQA Y1, Y11
 
 sealAVX2Tail256LoopA:
-	polyAdd(0(oup))
-	polyMul
-	LEAQ 16(oup), oup
+	ADDQ  (DI), R10
+	ADCQ  8(DI), R11
+	ADCQ  $0x01, R12
+	MOVQ  (BP), AX
+	MOVQ  AX, R15
+	MULQ  R10
+	MOVQ  AX, R13
+	MOVQ  DX, R14
+	MOVQ  (BP), AX
+	MULQ  R11
+	IMULQ R12, R15
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), AX
+	MOVQ  AX, R8
+	MULQ  R10
+	ADDQ  AX, R14
+	ADCQ  $0x00, DX
+	MOVQ  DX, R10
+	MOVQ  8(BP), AX
+	MULQ  R11
+	ADDQ  AX, R15
+	ADCQ  $0x00, DX
+	IMULQ R12, R8
+	ADDQ  R10, R15
+	ADCQ  DX, R8
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
+	LEAQ  16(DI), DI
 
 sealAVX2Tail256LoopB:
-	chachaQR_AVX2(AA0, BB0, CC0, DD0, TT0); chachaQR_AVX2(AA1, BB1, CC1, DD1, TT0)
-	polyAdd(0(oup))
-	polyMul
-	VPALIGNR $4, BB0, BB0, BB0; VPALIGNR $4, BB1, BB1, BB1
-	VPALIGNR $8, CC0, CC0, CC0; VPALIGNR $8, CC1, CC1, CC1
-	VPALIGNR $12, DD0, DD0, DD0; VPALIGNR $12, DD1, DD1, DD1
-	chachaQR_AVX2(AA0, BB0, CC0, DD0, TT0); chachaQR_AVX2(AA1, BB1, CC1, DD1, TT0)
-	polyAdd(16(oup))
-	polyMul
-	LEAQ     32(oup), oup
-	VPALIGNR $12, BB0, BB0, BB0; VPALIGNR $12, BB1, BB1, BB1
-	VPALIGNR $8, CC0, CC0, CC0; VPALIGNR $8, CC1, CC1, CC1
-	VPALIGNR $4, DD0, DD0, DD0; VPALIGNR $4, DD1, DD1, DD1
-	DECQ     itr1
-	JG       sealAVX2Tail256LoopA
-	DECQ     itr2
-	JGE      sealAVX2Tail256LoopB
+	VPADDD     Y14, Y0, Y0
+	VPXOR      Y0, Y4, Y4
+	VPSHUFB    ·rol16<>+0(SB), Y4, Y4
+	VPADDD     Y4, Y12, Y12
+	VPXOR      Y12, Y14, Y14
+	VPSLLD     $0x0c, Y14, Y3
+	VPSRLD     $0x14, Y14, Y14
+	VPXOR      Y3, Y14, Y14
+	VPADDD     Y14, Y0, Y0
+	VPXOR      Y0, Y4, Y4
+	VPSHUFB    ·rol8<>+0(SB), Y4, Y4
+	VPADDD     Y4, Y12, Y12
+	VPXOR      Y12, Y14, Y14
+	VPSLLD     $0x07, Y14, Y3
+	VPSRLD     $0x19, Y14, Y14
+	VPXOR      Y3, Y14, Y14
+	VPADDD     Y9, Y5, Y5
+	VPXOR      Y5, Y1, Y1
+	VPSHUFB    ·rol16<>+0(SB), Y1, Y1
+	VPADDD     Y1, Y13, Y13
+	VPXOR      Y13, Y9, Y9
+	VPSLLD     $0x0c, Y9, Y3
+	VPSRLD     $0x14, Y9, Y9
+	VPXOR      Y3, Y9, Y9
+	VPADDD     Y9, Y5, Y5
+	VPXOR      Y5, Y1, Y1
+	VPSHUFB    ·rol8<>+0(SB), Y1, Y1
+	VPADDD     Y1, Y13, Y13
+	VPXOR      Y13, Y9, Y9
+	VPSLLD     $0x07, Y9, Y3
+	VPSRLD     $0x19, Y9, Y9
+	VPXOR      Y3, Y9, Y9
+	ADDQ       (DI), R10
+	ADCQ       8(DI), R11
+	ADCQ       $0x01, R12
+	MOVQ       (BP), AX
+	MOVQ       AX, R15
+	MULQ       R10
+	MOVQ       AX, R13
+	MOVQ       DX, R14
+	MOVQ       (BP), AX
+	MULQ       R11
+	IMULQ      R12, R15
+	ADDQ       AX, R14
+	ADCQ       DX, R15
+	MOVQ       8(BP), AX
+	MOVQ       AX, R8
+	MULQ       R10
+	ADDQ       AX, R14
+	ADCQ       $0x00, DX
+	MOVQ       DX, R10
+	MOVQ       8(BP), AX
+	MULQ       R11
+	ADDQ       AX, R15
+	ADCQ       $0x00, DX
+	IMULQ      R12, R8
+	ADDQ       R10, R15
+	ADCQ       DX, R8
+	MOVQ       R13, R10
+	MOVQ       R14, R11
+	MOVQ       R15, R12
+	ANDQ       $0x03, R12
+	MOVQ       R15, R13
+	ANDQ       $-4, R13
+	MOVQ       R8, R14
+	SHRQ       $0x02, R8, R15
+	SHRQ       $0x02, R8
+	ADDQ       R13, R10
+	ADCQ       R14, R11
+	ADCQ       $0x00, R12
+	ADDQ       R15, R10
+	ADCQ       R8, R11
+	ADCQ       $0x00, R12
+	VPALIGNR   $0x04, Y14, Y14, Y14
+	VPALIGNR   $0x04, Y9, Y9, Y9
+	VPALIGNR   $0x08, Y12, Y12, Y12
+	VPALIGNR   $0x08, Y13, Y13, Y13
+	VPALIGNR   $0x0c, Y4, Y4, Y4
+	VPALIGNR   $0x0c, Y1, Y1, Y1
+	VPADDD     Y14, Y0, Y0
+	VPXOR      Y0, Y4, Y4
+	VPSHUFB    ·rol16<>+0(SB), Y4, Y4
+	VPADDD     Y4, Y12, Y12
+	VPXOR      Y12, Y14, Y14
+	VPSLLD     $0x0c, Y14, Y3
+	VPSRLD     $0x14, Y14, Y14
+	VPXOR      Y3, Y14, Y14
+	VPADDD     Y14, Y0, Y0
+	VPXOR      Y0, Y4, Y4
+	VPSHUFB    ·rol8<>+0(SB), Y4, Y4
+	VPADDD     Y4, Y12, Y12
+	VPXOR      Y12, Y14, Y14
+	VPSLLD     $0x07, Y14, Y3
+	VPSRLD     $0x19, Y14, Y14
+	VPXOR      Y3, Y14, Y14
+	VPADDD     Y9, Y5, Y5
+	VPXOR      Y5, Y1, Y1
+	VPSHUFB    ·rol16<>+0(SB), Y1, Y1
+	VPADDD     Y1, Y13, Y13
+	VPXOR      Y13, Y9, Y9
+	VPSLLD     $0x0c, Y9, Y3
+	VPSRLD     $0x14, Y9, Y9
+	VPXOR      Y3, Y9, Y9
+	VPADDD     Y9, Y5, Y5
+	VPXOR      Y5, Y1, Y1
+	VPSHUFB    ·rol8<>+0(SB), Y1, Y1
+	VPADDD     Y1, Y13, Y13
+	VPXOR      Y13, Y9, Y9
+	VPSLLD     $0x07, Y9, Y3
+	VPSRLD     $0x19, Y9, Y9
+	VPXOR      Y3, Y9, Y9
+	ADDQ       16(DI), R10
+	ADCQ       24(DI), R11
+	ADCQ       $0x01, R12
+	MOVQ       (BP), AX
+	MOVQ       AX, R15
+	MULQ       R10
+	MOVQ       AX, R13
+	MOVQ       DX, R14
+	MOVQ       (BP), AX
+	MULQ       R11
+	IMULQ      R12, R15
+	ADDQ       AX, R14
+	ADCQ       DX, R15
+	MOVQ       8(BP), AX
+	MOVQ       AX, R8
+	MULQ       R10
+	ADDQ       AX, R14
+	ADCQ       $0x00, DX
+	MOVQ       DX, R10
+	MOVQ       8(BP), AX
+	MULQ       R11
+	ADDQ       AX, R15
+	ADCQ       $0x00, DX
+	IMULQ      R12, R8
+	ADDQ       R10, R15
+	ADCQ       DX, R8
+	MOVQ       R13, R10
+	MOVQ       R14, R11
+	MOVQ       R15, R12
+	ANDQ       $0x03, R12
+	MOVQ       R15, R13
+	ANDQ       $-4, R13
+	MOVQ       R8, R14
+	SHRQ       $0x02, R8, R15
+	SHRQ       $0x02, R8
+	ADDQ       R13, R10
+	ADCQ       R14, R11
+	ADCQ       $0x00, R12
+	ADDQ       R15, R10
+	ADCQ       R8, R11
+	ADCQ       $0x00, R12
+	LEAQ       32(DI), DI
+	VPALIGNR   $0x0c, Y14, Y14, Y14
+	VPALIGNR   $0x0c, Y9, Y9, Y9
+	VPALIGNR   $0x08, Y12, Y12, Y12
+	VPALIGNR   $0x08, Y13, Y13, Y13
+	VPALIGNR   $0x04, Y4, Y4, Y4
+	VPALIGNR   $0x04, Y1, Y1, Y1
+	DECQ       CX
+	JG         sealAVX2Tail256LoopA
+	DECQ       R9
+	JGE        sealAVX2Tail256LoopB
+	VPADDD     ·chacha20Constants<>+0(SB), Y0, Y0
+	VPADDD     ·chacha20Constants<>+0(SB), Y5, Y5
+	VPADDD     32(BP), Y14, Y14
+	VPADDD     32(BP), Y9, Y9
+	VPADDD     64(BP), Y12, Y12
+	VPADDD     64(BP), Y13, Y13
+	VPADDD     Y7, Y4, Y4
+	VPADDD     Y11, Y1, Y1
+	VPERM2I128 $0x02, Y0, Y14, Y3
+	VPERM2I128 $0x02, Y12, Y4, Y7
+	VPERM2I128 $0x13, Y0, Y14, Y11
+	VPERM2I128 $0x13, Y12, Y4, Y15
+	VPXOR      (SI), Y3, Y3
+	VPXOR      32(SI), Y7, Y7
+	VPXOR      64(SI), Y11, Y11
+	VPXOR      96(SI), Y15, Y15
+	VMOVDQU    Y3, (DI)
+	VMOVDQU    Y7, 32(DI)
+	VMOVDQU    Y11, 64(DI)
+	VMOVDQU    Y15, 96(DI)
+	MOVQ       $0x00000080, CX
+	LEAQ       128(SI), SI
+	SUBQ       $0x80, BX
+	VPERM2I128 $0x02, Y5, Y9, Y0
+	VPERM2I128 $0x02, Y13, Y1, Y14
+	VPERM2I128 $0x13, Y5, Y9, Y12
+	VPERM2I128 $0x13, Y13, Y1, Y4
+	JMP        sealAVX2SealHash
 
-	VPADDD     ·chacha20Constants<>(SB), AA0, AA0; VPADDD ·chacha20Constants<>(SB), AA1, AA1
-	VPADDD     state1StoreAVX2, BB0, BB0; VPADDD state1StoreAVX2, BB1, BB1
-	VPADDD     state2StoreAVX2, CC0, CC0; VPADDD state2StoreAVX2, CC1, CC1
-	VPADDD     TT1, DD0, DD0; VPADDD TT2, DD1, DD1
-	VPERM2I128 $0x02, AA0, BB0, TT0
-	VPERM2I128 $0x02, CC0, DD0, TT1
-	VPERM2I128 $0x13, AA0, BB0, TT2
-	VPERM2I128 $0x13, CC0, DD0, TT3
-	VPXOR      (0*32)(inp), TT0, TT0; VPXOR (1*32)(inp), TT1, TT1; VPXOR (2*32)(inp), TT2, TT2; VPXOR (3*32)(inp), TT3, TT3
-	VMOVDQU    TT0, (0*32)(oup); VMOVDQU TT1, (1*32)(oup); VMOVDQU TT2, (2*32)(oup); VMOVDQU TT3, (3*32)(oup)
-	MOVQ       $128, itr1
-	LEAQ       128(inp), inp
-	SUBQ       $128, inl
-	VPERM2I128 $0x02, AA1, BB1, AA0
-	VPERM2I128 $0x02, CC1, DD1, BB0
-	VPERM2I128 $0x13, AA1, BB1, CC0
-	VPERM2I128 $0x13, CC1, DD1, DD0
-
-	JMP sealAVX2SealHash
-
-// ----------------------------------------------------------------------------
-// Special optimization for the last 384 bytes of ciphertext
 sealAVX2Tail384:
-	// Need to decrypt up to 384 bytes - prepare two blocks
-	// If we got here after the main loop - there are 512 encrypted bytes waiting to be hashed
-	// If we got here before the main loop - there are 448 encrpyred bytes waiting to be hashed
-	VMOVDQA ·chacha20Constants<>(SB), AA0; VMOVDQA AA0, AA1; VMOVDQA AA0, AA2
-	VMOVDQA state1StoreAVX2, BB0; VMOVDQA BB0, BB1; VMOVDQA BB0, BB2
-	VMOVDQA state2StoreAVX2, CC0; VMOVDQA CC0, CC1; VMOVDQA CC0, CC2
-	VMOVDQA ctr3StoreAVX2, DD0
-	VPADDD  ·avx2IncMask<>(SB), DD0, DD0; VPADDD ·avx2IncMask<>(SB), DD0, DD1; VPADDD ·avx2IncMask<>(SB), DD1, DD2
-	VMOVDQA DD0, TT1; VMOVDQA DD1, TT2; VMOVDQA DD2, TT3
+	VMOVDQA ·chacha20Constants<>+0(SB), Y0
+	VMOVDQA Y0, Y5
+	VMOVDQA Y0, Y6
+	VMOVDQA 32(BP), Y14
+	VMOVDQA Y14, Y9
+	VMOVDQA Y14, Y10
+	VMOVDQA 64(BP), Y12
+	VMOVDQA Y12, Y13
+	VMOVDQA Y12, Y8
+	VMOVDQA 192(BP), Y4
+	VPADDD  ·avx2IncMask<>+0(SB), Y4, Y4
+	VPADDD  ·avx2IncMask<>+0(SB), Y4, Y1
+	VPADDD  ·avx2IncMask<>+0(SB), Y1, Y2
+	VMOVDQA Y4, Y7
+	VMOVDQA Y1, Y11
+	VMOVDQA Y2, Y15
 
 sealAVX2Tail384LoopA:
-	polyAdd(0(oup))
-	polyMul
-	LEAQ 16(oup), oup
+	ADDQ  (DI), R10
+	ADCQ  8(DI), R11
+	ADCQ  $0x01, R12
+	MOVQ  (BP), AX
+	MOVQ  AX, R15
+	MULQ  R10
+	MOVQ  AX, R13
+	MOVQ  DX, R14
+	MOVQ  (BP), AX
+	MULQ  R11
+	IMULQ R12, R15
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), AX
+	MOVQ  AX, R8
+	MULQ  R10
+	ADDQ  AX, R14
+	ADCQ  $0x00, DX
+	MOVQ  DX, R10
+	MOVQ  8(BP), AX
+	MULQ  R11
+	ADDQ  AX, R15
+	ADCQ  $0x00, DX
+	IMULQ R12, R8
+	ADDQ  R10, R15
+	ADCQ  DX, R8
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
+	LEAQ  16(DI), DI
 
 sealAVX2Tail384LoopB:
-	chachaQR_AVX2(AA0, BB0, CC0, DD0, TT0); chachaQR_AVX2(AA1, BB1, CC1, DD1, TT0); chachaQR_AVX2(AA2, BB2, CC2, DD2, TT0)
-	polyAdd(0(oup))
-	polyMul
-	VPALIGNR $4, BB0, BB0, BB0; VPALIGNR $4, BB1, BB1, BB1; VPALIGNR $4, BB2, BB2, BB2
-	VPALIGNR $8, CC0, CC0, CC0; VPALIGNR $8, CC1, CC1, CC1; VPALIGNR $8, CC2, CC2, CC2
-	VPALIGNR $12, DD0, DD0, DD0; VPALIGNR $12, DD1, DD1, DD1; VPALIGNR $12, DD2, DD2, DD2
-	chachaQR_AVX2(AA0, BB0, CC0, DD0, TT0); chachaQR_AVX2(AA1, BB1, CC1, DD1, TT0); chachaQR_AVX2(AA2, BB2, CC2, DD2, TT0)
-	polyAdd(16(oup))
-	polyMul
-	LEAQ     32(oup), oup
-	VPALIGNR $12, BB0, BB0, BB0; VPALIGNR $12, BB1, BB1, BB1; VPALIGNR $12, BB2, BB2, BB2
-	VPALIGNR $8, CC0, CC0, CC0; VPALIGNR $8, CC1, CC1, CC1; VPALIGNR $8, CC2, CC2, CC2
-	VPALIGNR $4, DD0, DD0, DD0; VPALIGNR $4, DD1, DD1, DD1; VPALIGNR $4, DD2, DD2, DD2
-	DECQ     itr1
-	JG       sealAVX2Tail384LoopA
-	DECQ     itr2
-	JGE      sealAVX2Tail384LoopB
+	VPADDD     Y14, Y0, Y0
+	VPXOR      Y0, Y4, Y4
+	VPSHUFB    ·rol16<>+0(SB), Y4, Y4
+	VPADDD     Y4, Y12, Y12
+	VPXOR      Y12, Y14, Y14
+	VPSLLD     $0x0c, Y14, Y3
+	VPSRLD     $0x14, Y14, Y14
+	VPXOR      Y3, Y14, Y14
+	VPADDD     Y14, Y0, Y0
+	VPXOR      Y0, Y4, Y4
+	VPSHUFB    ·rol8<>+0(SB), Y4, Y4
+	VPADDD     Y4, Y12, Y12
+	VPXOR      Y12, Y14, Y14
+	VPSLLD     $0x07, Y14, Y3
+	VPSRLD     $0x19, Y14, Y14
+	VPXOR      Y3, Y14, Y14
+	VPADDD     Y9, Y5, Y5
+	VPXOR      Y5, Y1, Y1
+	VPSHUFB    ·rol16<>+0(SB), Y1, Y1
+	VPADDD     Y1, Y13, Y13
+	VPXOR      Y13, Y9, Y9
+	VPSLLD     $0x0c, Y9, Y3
+	VPSRLD     $0x14, Y9, Y9
+	VPXOR      Y3, Y9, Y9
+	VPADDD     Y9, Y5, Y5
+	VPXOR      Y5, Y1, Y1
+	VPSHUFB    ·rol8<>+0(SB), Y1, Y1
+	VPADDD     Y1, Y13, Y13
+	VPXOR      Y13, Y9, Y9
+	VPSLLD     $0x07, Y9, Y3
+	VPSRLD     $0x19, Y9, Y9
+	VPXOR      Y3, Y9, Y9
+	VPADDD     Y10, Y6, Y6
+	VPXOR      Y6, Y2, Y2
+	VPSHUFB    ·rol16<>+0(SB), Y2, Y2
+	VPADDD     Y2, Y8, Y8
+	VPXOR      Y8, Y10, Y10
+	VPSLLD     $0x0c, Y10, Y3
+	VPSRLD     $0x14, Y10, Y10
+	VPXOR      Y3, Y10, Y10
+	VPADDD     Y10, Y6, Y6
+	VPXOR      Y6, Y2, Y2
+	VPSHUFB    ·rol8<>+0(SB), Y2, Y2
+	VPADDD     Y2, Y8, Y8
+	VPXOR      Y8, Y10, Y10
+	VPSLLD     $0x07, Y10, Y3
+	VPSRLD     $0x19, Y10, Y10
+	VPXOR      Y3, Y10, Y10
+	ADDQ       (DI), R10
+	ADCQ       8(DI), R11
+	ADCQ       $0x01, R12
+	MOVQ       (BP), AX
+	MOVQ       AX, R15
+	MULQ       R10
+	MOVQ       AX, R13
+	MOVQ       DX, R14
+	MOVQ       (BP), AX
+	MULQ       R11
+	IMULQ      R12, R15
+	ADDQ       AX, R14
+	ADCQ       DX, R15
+	MOVQ       8(BP), AX
+	MOVQ       AX, R8
+	MULQ       R10
+	ADDQ       AX, R14
+	ADCQ       $0x00, DX
+	MOVQ       DX, R10
+	MOVQ       8(BP), AX
+	MULQ       R11
+	ADDQ       AX, R15
+	ADCQ       $0x00, DX
+	IMULQ      R12, R8
+	ADDQ       R10, R15
+	ADCQ       DX, R8
+	MOVQ       R13, R10
+	MOVQ       R14, R11
+	MOVQ       R15, R12
+	ANDQ       $0x03, R12
+	MOVQ       R15, R13
+	ANDQ       $-4, R13
+	MOVQ       R8, R14
+	SHRQ       $0x02, R8, R15
+	SHRQ       $0x02, R8
+	ADDQ       R13, R10
+	ADCQ       R14, R11
+	ADCQ       $0x00, R12
+	ADDQ       R15, R10
+	ADCQ       R8, R11
+	ADCQ       $0x00, R12
+	VPALIGNR   $0x04, Y14, Y14, Y14
+	VPALIGNR   $0x04, Y9, Y9, Y9
+	VPALIGNR   $0x04, Y10, Y10, Y10
+	VPALIGNR   $0x08, Y12, Y12, Y12
+	VPALIGNR   $0x08, Y13, Y13, Y13
+	VPALIGNR   $0x08, Y8, Y8, Y8
+	VPALIGNR   $0x0c, Y4, Y4, Y4
+	VPALIGNR   $0x0c, Y1, Y1, Y1
+	VPALIGNR   $0x0c, Y2, Y2, Y2
+	VPADDD     Y14, Y0, Y0
+	VPXOR      Y0, Y4, Y4
+	VPSHUFB    ·rol16<>+0(SB), Y4, Y4
+	VPADDD     Y4, Y12, Y12
+	VPXOR      Y12, Y14, Y14
+	VPSLLD     $0x0c, Y14, Y3
+	VPSRLD     $0x14, Y14, Y14
+	VPXOR      Y3, Y14, Y14
+	VPADDD     Y14, Y0, Y0
+	VPXOR      Y0, Y4, Y4
+	VPSHUFB    ·rol8<>+0(SB), Y4, Y4
+	VPADDD     Y4, Y12, Y12
+	VPXOR      Y12, Y14, Y14
+	VPSLLD     $0x07, Y14, Y3
+	VPSRLD     $0x19, Y14, Y14
+	VPXOR      Y3, Y14, Y14
+	VPADDD     Y9, Y5, Y5
+	VPXOR      Y5, Y1, Y1
+	VPSHUFB    ·rol16<>+0(SB), Y1, Y1
+	VPADDD     Y1, Y13, Y13
+	VPXOR      Y13, Y9, Y9
+	VPSLLD     $0x0c, Y9, Y3
+	VPSRLD     $0x14, Y9, Y9
+	VPXOR      Y3, Y9, Y9
+	VPADDD     Y9, Y5, Y5
+	VPXOR      Y5, Y1, Y1
+	VPSHUFB    ·rol8<>+0(SB), Y1, Y1
+	VPADDD     Y1, Y13, Y13
+	VPXOR      Y13, Y9, Y9
+	VPSLLD     $0x07, Y9, Y3
+	VPSRLD     $0x19, Y9, Y9
+	VPXOR      Y3, Y9, Y9
+	VPADDD     Y10, Y6, Y6
+	VPXOR      Y6, Y2, Y2
+	VPSHUFB    ·rol16<>+0(SB), Y2, Y2
+	VPADDD     Y2, Y8, Y8
+	VPXOR      Y8, Y10, Y10
+	VPSLLD     $0x0c, Y10, Y3
+	VPSRLD     $0x14, Y10, Y10
+	VPXOR      Y3, Y10, Y10
+	VPADDD     Y10, Y6, Y6
+	VPXOR      Y6, Y2, Y2
+	VPSHUFB    ·rol8<>+0(SB), Y2, Y2
+	VPADDD     Y2, Y8, Y8
+	VPXOR      Y8, Y10, Y10
+	VPSLLD     $0x07, Y10, Y3
+	VPSRLD     $0x19, Y10, Y10
+	VPXOR      Y3, Y10, Y10
+	ADDQ       16(DI), R10
+	ADCQ       24(DI), R11
+	ADCQ       $0x01, R12
+	MOVQ       (BP), AX
+	MOVQ       AX, R15
+	MULQ       R10
+	MOVQ       AX, R13
+	MOVQ       DX, R14
+	MOVQ       (BP), AX
+	MULQ       R11
+	IMULQ      R12, R15
+	ADDQ       AX, R14
+	ADCQ       DX, R15
+	MOVQ       8(BP), AX
+	MOVQ       AX, R8
+	MULQ       R10
+	ADDQ       AX, R14
+	ADCQ       $0x00, DX
+	MOVQ       DX, R10
+	MOVQ       8(BP), AX
+	MULQ       R11
+	ADDQ       AX, R15
+	ADCQ       $0x00, DX
+	IMULQ      R12, R8
+	ADDQ       R10, R15
+	ADCQ       DX, R8
+	MOVQ       R13, R10
+	MOVQ       R14, R11
+	MOVQ       R15, R12
+	ANDQ       $0x03, R12
+	MOVQ       R15, R13
+	ANDQ       $-4, R13
+	MOVQ       R8, R14
+	SHRQ       $0x02, R8, R15
+	SHRQ       $0x02, R8
+	ADDQ       R13, R10
+	ADCQ       R14, R11
+	ADCQ       $0x00, R12
+	ADDQ       R15, R10
+	ADCQ       R8, R11
+	ADCQ       $0x00, R12
+	LEAQ       32(DI), DI
+	VPALIGNR   $0x0c, Y14, Y14, Y14
+	VPALIGNR   $0x0c, Y9, Y9, Y9
+	VPALIGNR   $0x0c, Y10, Y10, Y10
+	VPALIGNR   $0x08, Y12, Y12, Y12
+	VPALIGNR   $0x08, Y13, Y13, Y13
+	VPALIGNR   $0x08, Y8, Y8, Y8
+	VPALIGNR   $0x04, Y4, Y4, Y4
+	VPALIGNR   $0x04, Y1, Y1, Y1
+	VPALIGNR   $0x04, Y2, Y2, Y2
+	DECQ       CX
+	JG         sealAVX2Tail384LoopA
+	DECQ       R9
+	JGE        sealAVX2Tail384LoopB
+	VPADDD     ·chacha20Constants<>+0(SB), Y0, Y0
+	VPADDD     ·chacha20Constants<>+0(SB), Y5, Y5
+	VPADDD     ·chacha20Constants<>+0(SB), Y6, Y6
+	VPADDD     32(BP), Y14, Y14
+	VPADDD     32(BP), Y9, Y9
+	VPADDD     32(BP), Y10, Y10
+	VPADDD     64(BP), Y12, Y12
+	VPADDD     64(BP), Y13, Y13
+	VPADDD     64(BP), Y8, Y8
+	VPADDD     Y7, Y4, Y4
+	VPADDD     Y11, Y1, Y1
+	VPADDD     Y15, Y2, Y2
+	VPERM2I128 $0x02, Y0, Y14, Y3
+	VPERM2I128 $0x02, Y12, Y4, Y7
+	VPERM2I128 $0x13, Y0, Y14, Y11
+	VPERM2I128 $0x13, Y12, Y4, Y15
+	VPXOR      (SI), Y3, Y3
+	VPXOR      32(SI), Y7, Y7
+	VPXOR      64(SI), Y11, Y11
+	VPXOR      96(SI), Y15, Y15
+	VMOVDQU    Y3, (DI)
+	VMOVDQU    Y7, 32(DI)
+	VMOVDQU    Y11, 64(DI)
+	VMOVDQU    Y15, 96(DI)
+	VPERM2I128 $0x02, Y5, Y9, Y3
+	VPERM2I128 $0x02, Y13, Y1, Y7
+	VPERM2I128 $0x13, Y5, Y9, Y11
+	VPERM2I128 $0x13, Y13, Y1, Y15
+	VPXOR      128(SI), Y3, Y3
+	VPXOR      160(SI), Y7, Y7
+	VPXOR      192(SI), Y11, Y11
+	VPXOR      224(SI), Y15, Y15
+	VMOVDQU    Y3, 128(DI)
+	VMOVDQU    Y7, 160(DI)
+	VMOVDQU    Y11, 192(DI)
+	VMOVDQU    Y15, 224(DI)
+	MOVQ       $0x00000100, CX
+	LEAQ       256(SI), SI
+	SUBQ       $0x00000100, BX
+	VPERM2I128 $0x02, Y6, Y10, Y0
+	VPERM2I128 $0x02, Y8, Y2, Y14
+	VPERM2I128 $0x13, Y6, Y10, Y12
+	VPERM2I128 $0x13, Y8, Y2, Y4
+	JMP        sealAVX2SealHash
 
-	VPADDD     ·chacha20Constants<>(SB), AA0, AA0; VPADDD ·chacha20Constants<>(SB), AA1, AA1; VPADDD ·chacha20Constants<>(SB), AA2, AA2
-	VPADDD     state1StoreAVX2, BB0, BB0; VPADDD state1StoreAVX2, BB1, BB1; VPADDD state1StoreAVX2, BB2, BB2
-	VPADDD     state2StoreAVX2, CC0, CC0; VPADDD state2StoreAVX2, CC1, CC1; VPADDD state2StoreAVX2, CC2, CC2
-	VPADDD     TT1, DD0, DD0; VPADDD TT2, DD1, DD1; VPADDD TT3, DD2, DD2
-	VPERM2I128 $0x02, AA0, BB0, TT0
-	VPERM2I128 $0x02, CC0, DD0, TT1
-	VPERM2I128 $0x13, AA0, BB0, TT2
-	VPERM2I128 $0x13, CC0, DD0, TT3
-	VPXOR      (0*32)(inp), TT0, TT0; VPXOR (1*32)(inp), TT1, TT1; VPXOR (2*32)(inp), TT2, TT2; VPXOR (3*32)(inp), TT3, TT3
-	VMOVDQU    TT0, (0*32)(oup); VMOVDQU TT1, (1*32)(oup); VMOVDQU TT2, (2*32)(oup); VMOVDQU TT3, (3*32)(oup)
-	VPERM2I128 $0x02, AA1, BB1, TT0
-	VPERM2I128 $0x02, CC1, DD1, TT1
-	VPERM2I128 $0x13, AA1, BB1, TT2
-	VPERM2I128 $0x13, CC1, DD1, TT3
-	VPXOR      (4*32)(inp), TT0, TT0; VPXOR (5*32)(inp), TT1, TT1; VPXOR (6*32)(inp), TT2, TT2; VPXOR (7*32)(inp), TT3, TT3
-	VMOVDQU    TT0, (4*32)(oup); VMOVDQU TT1, (5*32)(oup); VMOVDQU TT2, (6*32)(oup); VMOVDQU TT3, (7*32)(oup)
-	MOVQ       $256, itr1
-	LEAQ       256(inp), inp
-	SUBQ       $256, inl
-	VPERM2I128 $0x02, AA2, BB2, AA0
-	VPERM2I128 $0x02, CC2, DD2, BB0
-	VPERM2I128 $0x13, AA2, BB2, CC0
-	VPERM2I128 $0x13, CC2, DD2, DD0
-
-	JMP sealAVX2SealHash
-
-// ----------------------------------------------------------------------------
-// Special optimization for the last 512 bytes of ciphertext
 sealAVX2Tail512:
-	// Need to decrypt up to 512 bytes - prepare two blocks
-	// If we got here after the main loop - there are 512 encrypted bytes waiting to be hashed
-	// If we got here before the main loop - there are 448 encrpyred bytes waiting to be hashed
-	VMOVDQA ·chacha20Constants<>(SB), AA0; VMOVDQA AA0, AA1; VMOVDQA AA0, AA2; VMOVDQA AA0, AA3
-	VMOVDQA state1StoreAVX2, BB0; VMOVDQA BB0, BB1; VMOVDQA BB0, BB2; VMOVDQA BB0, BB3
-	VMOVDQA state2StoreAVX2, CC0; VMOVDQA CC0, CC1; VMOVDQA CC0, CC2; VMOVDQA CC0, CC3
-	VMOVDQA ctr3StoreAVX2, DD0
-	VPADDD  ·avx2IncMask<>(SB), DD0, DD0; VPADDD ·avx2IncMask<>(SB), DD0, DD1; VPADDD ·avx2IncMask<>(SB), DD1, DD2; VPADDD ·avx2IncMask<>(SB), DD2, DD3
-	VMOVDQA DD0, ctr0StoreAVX2; VMOVDQA DD1, ctr1StoreAVX2; VMOVDQA DD2, ctr2StoreAVX2; VMOVDQA DD3, ctr3StoreAVX2
+	VMOVDQA ·chacha20Constants<>+0(SB), Y0
+	VMOVDQA Y0, Y5
+	VMOVDQA Y0, Y6
+	VMOVDQA Y0, Y7
+	VMOVDQA 32(BP), Y14
+	VMOVDQA Y14, Y9
+	VMOVDQA Y14, Y10
+	VMOVDQA Y14, Y11
+	VMOVDQA 64(BP), Y12
+	VMOVDQA Y12, Y13
+	VMOVDQA Y12, Y8
+	VMOVDQA Y12, Y15
+	VMOVDQA 192(BP), Y4
+	VPADDD  ·avx2IncMask<>+0(SB), Y4, Y4
+	VPADDD  ·avx2IncMask<>+0(SB), Y4, Y1
+	VPADDD  ·avx2IncMask<>+0(SB), Y1, Y2
+	VPADDD  ·avx2IncMask<>+0(SB), Y2, Y3
+	VMOVDQA Y4, 96(BP)
+	VMOVDQA Y1, 128(BP)
+	VMOVDQA Y2, 160(BP)
+	VMOVDQA Y3, 192(BP)
 
 sealAVX2Tail512LoopA:
-	polyAdd(0(oup))
-	polyMul
-	LEAQ 16(oup), oup
+	ADDQ  (DI), R10
+	ADCQ  8(DI), R11
+	ADCQ  $0x01, R12
+	MOVQ  (BP), AX
+	MOVQ  AX, R15
+	MULQ  R10
+	MOVQ  AX, R13
+	MOVQ  DX, R14
+	MOVQ  (BP), AX
+	MULQ  R11
+	IMULQ R12, R15
+	ADDQ  AX, R14
+	ADCQ  DX, R15
+	MOVQ  8(BP), AX
+	MOVQ  AX, R8
+	MULQ  R10
+	ADDQ  AX, R14
+	ADCQ  $0x00, DX
+	MOVQ  DX, R10
+	MOVQ  8(BP), AX
+	MULQ  R11
+	ADDQ  AX, R15
+	ADCQ  $0x00, DX
+	IMULQ R12, R8
+	ADDQ  R10, R15
+	ADCQ  DX, R8
+	MOVQ  R13, R10
+	MOVQ  R14, R11
+	MOVQ  R15, R12
+	ANDQ  $0x03, R12
+	MOVQ  R15, R13
+	ANDQ  $-4, R13
+	MOVQ  R8, R14
+	SHRQ  $0x02, R8, R15
+	SHRQ  $0x02, R8
+	ADDQ  R13, R10
+	ADCQ  R14, R11
+	ADCQ  $0x00, R12
+	ADDQ  R15, R10
+	ADCQ  R8, R11
+	ADCQ  $0x00, R12
+	LEAQ  16(DI), DI
 
 sealAVX2Tail512LoopB:
-	VPADDD   BB0, AA0, AA0; VPADDD BB1, AA1, AA1; VPADDD BB2, AA2, AA2; VPADDD BB3, AA3, AA3
-	VPXOR    AA0, DD0, DD0; VPXOR AA1, DD1, DD1; VPXOR AA2, DD2, DD2; VPXOR AA3, DD3, DD3
-	VPSHUFB  ·rol16<>(SB), DD0, DD0; VPSHUFB ·rol16<>(SB), DD1, DD1; VPSHUFB ·rol16<>(SB), DD2, DD2; VPSHUFB ·rol16<>(SB), DD3, DD3
-	VPADDD   DD0, CC0, CC0; VPADDD DD1, CC1, CC1; VPADDD DD2, CC2, CC2; VPADDD DD3, CC3, CC3
-	VPXOR    CC0, BB0, BB0; VPXOR CC1, BB1, BB1; VPXOR CC2, BB2, BB2; VPXOR CC3, BB3, BB3
-	VMOVDQA  CC3, tmpStoreAVX2
-	VPSLLD   $12, BB0, CC3; VPSRLD $20, BB0, BB0; VPXOR CC3, BB0, BB0
-	VPSLLD   $12, BB1, CC3; VPSRLD $20, BB1, BB1; VPXOR CC3, BB1, BB1
-	VPSLLD   $12, BB2, CC3; VPSRLD $20, BB2, BB2; VPXOR CC3, BB2, BB2
-	VPSLLD   $12, BB3, CC3; VPSRLD $20, BB3, BB3; VPXOR CC3, BB3, BB3
-	VMOVDQA  tmpStoreAVX2, CC3
-	polyAdd(0*8(oup))
-	polyMulAVX2
-	VPADDD   BB0, AA0, AA0; VPADDD BB1, AA1, AA1; VPADDD BB2, AA2, AA2; VPADDD BB3, AA3, AA3
-	VPXOR    AA0, DD0, DD0; VPXOR AA1, DD1, DD1; VPXOR AA2, DD2, DD2; VPXOR AA3, DD3, DD3
-	VPSHUFB  ·rol8<>(SB), DD0, DD0; VPSHUFB ·rol8<>(SB), DD1, DD1; VPSHUFB ·rol8<>(SB), DD2, DD2; VPSHUFB ·rol8<>(SB), DD3, DD3
-	VPADDD   DD0, CC0, CC0; VPADDD DD1, CC1, CC1; VPADDD DD2, CC2, CC2; VPADDD DD3, CC3, CC3
-	VPXOR    CC0, BB0, BB0; VPXOR CC1, BB1, BB1; VPXOR CC2, BB2, BB2; VPXOR CC3, BB3, BB3
-	VMOVDQA  CC3, tmpStoreAVX2
-	VPSLLD   $7, BB0, CC3; VPSRLD $25, BB0, BB0; VPXOR CC3, BB0, BB0
-	VPSLLD   $7, BB1, CC3; VPSRLD $25, BB1, BB1; VPXOR CC3, BB1, BB1
-	VPSLLD   $7, BB2, CC3; VPSRLD $25, BB2, BB2; VPXOR CC3, BB2, BB2
-	VPSLLD   $7, BB3, CC3; VPSRLD $25, BB3, BB3; VPXOR CC3, BB3, BB3
-	VMOVDQA  tmpStoreAVX2, CC3
-	VPALIGNR $4, BB0, BB0, BB0; VPALIGNR $4, BB1, BB1, BB1; VPALIGNR $4, BB2, BB2, BB2; VPALIGNR $4, BB3, BB3, BB3
-	VPALIGNR $8, CC0, CC0, CC0; VPALIGNR $8, CC1, CC1, CC1; VPALIGNR $8, CC2, CC2, CC2; VPALIGNR $8, CC3, CC3, CC3
-	VPALIGNR $12, DD0, DD0, DD0; VPALIGNR $12, DD1, DD1, DD1; VPALIGNR $12, DD2, DD2, DD2; VPALIGNR $12, DD3, DD3, DD3
-	VPADDD   BB0, AA0, AA0; VPADDD BB1, AA1, AA1; VPADDD BB2, AA2, AA2; VPADDD BB3, AA3, AA3
-	VPXOR    AA0, DD0, DD0; VPXOR AA1, DD1, DD1; VPXOR AA2, DD2, DD2; VPXOR AA3, DD3, DD3
-	VPSHUFB  ·rol16<>(SB), DD0, DD0; VPSHUFB ·rol16<>(SB), DD1, DD1; VPSHUFB ·rol16<>(SB), DD2, DD2; VPSHUFB ·rol16<>(SB), DD3, DD3
-	VPADDD   DD0, CC0, CC0; VPADDD DD1, CC1, CC1; VPADDD DD2, CC2, CC2; VPADDD DD3, CC3, CC3
-	VPXOR    CC0, BB0, BB0; VPXOR CC1, BB1, BB1; VPXOR CC2, BB2, BB2; VPXOR CC3, BB3, BB3
-	polyAdd(2*8(oup))
-	polyMulAVX2
-	LEAQ     (4*8)(oup), oup
-	VMOVDQA  CC3, tmpStoreAVX2
-	VPSLLD   $12, BB0, CC3; VPSRLD $20, BB0, BB0; VPXOR CC3, BB0, BB0
-	VPSLLD   $12, BB1, CC3; VPSRLD $20, BB1, BB1; VPXOR CC3, BB1, BB1
-	VPSLLD   $12, BB2, CC3; VPSRLD $20, BB2, BB2; VPXOR CC3, BB2, BB2
-	VPSLLD   $12, BB3, CC3; VPSRLD $20, BB3, BB3; VPXOR CC3, BB3, BB3
-	VMOVDQA  tmpStoreAVX2, CC3
-	VPADDD   BB0, AA0, AA0; VPADDD BB1, AA1, AA1; VPADDD BB2, AA2, AA2; VPADDD BB3, AA3, AA3
-	VPXOR    AA0, DD0, DD0; VPXOR AA1, DD1, DD1; VPXOR AA2, DD2, DD2; VPXOR AA3, DD3, DD3
-	VPSHUFB  ·rol8<>(SB), DD0, DD0; VPSHUFB ·rol8<>(SB), DD1, DD1; VPSHUFB ·rol8<>(SB), DD2, DD2; VPSHUFB ·rol8<>(SB), DD3, DD3
-	VPADDD   DD0, CC0, CC0; VPADDD DD1, CC1, CC1; VPADDD DD2, CC2, CC2; VPADDD DD3, CC3, CC3
-	VPXOR    CC0, BB0, BB0; VPXOR CC1, BB1, BB1; VPXOR CC2, BB2, BB2; VPXOR CC3, BB3, BB3
-	VMOVDQA  CC3, tmpStoreAVX2
-	VPSLLD   $7, BB0, CC3; VPSRLD $25, BB0, BB0; VPXOR CC3, BB0, BB0
-	VPSLLD   $7, BB1, CC3; VPSRLD $25, BB1, BB1; VPXOR CC3, BB1, BB1
-	VPSLLD   $7, BB2, CC3; VPSRLD $25, BB2, BB2; VPXOR CC3, BB2, BB2
-	VPSLLD   $7, BB3, CC3; VPSRLD $25, BB3, BB3; VPXOR CC3, BB3, BB3
-	VMOVDQA  tmpStoreAVX2, CC3
-	VPALIGNR $12, BB0, BB0, BB0; VPALIGNR $12, BB1, BB1, BB1; VPALIGNR $12, BB2, BB2, BB2; VPALIGNR $12, BB3, BB3, BB3
-	VPALIGNR $8, CC0, CC0, CC0; VPALIGNR $8, CC1, CC1, CC1; VPALIGNR $8, CC2, CC2, CC2; VPALIGNR $8, CC3, CC3, CC3
-	VPALIGNR $4, DD0, DD0, DD0; VPALIGNR $4, DD1, DD1, DD1; VPALIGNR $4, DD2, DD2, DD2; VPALIGNR $4, DD3, DD3, DD3
-
-	DECQ itr1
-	JG   sealAVX2Tail512LoopA
-	DECQ itr2
-	JGE  sealAVX2Tail512LoopB
-
-	VPADDD     ·chacha20Constants<>(SB), AA0, AA0; VPADDD ·chacha20Constants<>(SB), AA1, AA1; VPADDD ·chacha20Constants<>(SB), AA2, AA2; VPADDD ·chacha20Constants<>(SB), AA3, AA3
-	VPADDD     state1StoreAVX2, BB0, BB0; VPADDD state1StoreAVX2, BB1, BB1; VPADDD state1StoreAVX2, BB2, BB2; VPADDD state1StoreAVX2, BB3, BB3
-	VPADDD     state2StoreAVX2, CC0, CC0; VPADDD state2StoreAVX2, CC1, CC1; VPADDD state2StoreAVX2, CC2, CC2; VPADDD state2StoreAVX2, CC3, CC3
-	VPADDD     ctr0StoreAVX2, DD0, DD0; VPADDD ctr1StoreAVX2, DD1, DD1; VPADDD ctr2StoreAVX2, DD2, DD2; VPADDD ctr3StoreAVX2, DD3, DD3
-	VMOVDQA    CC3, tmpStoreAVX2
-	VPERM2I128 $0x02, AA0, BB0, CC3
-	VPXOR      (0*32)(inp), CC3, CC3
-	VMOVDQU    CC3, (0*32)(oup)
-	VPERM2I128 $0x02, CC0, DD0, CC3
-	VPXOR      (1*32)(inp), CC3, CC3
-	VMOVDQU    CC3, (1*32)(oup)
-	VPERM2I128 $0x13, AA0, BB0, CC3
-	VPXOR      (2*32)(inp), CC3, CC3
-	VMOVDQU    CC3, (2*32)(oup)
-	VPERM2I128 $0x13, CC0, DD0, CC3
-	VPXOR      (3*32)(inp), CC3, CC3
-	VMOVDQU    CC3, (3*32)(oup)
-
-	VPERM2I128 $0x02, AA1, BB1, AA0
-	VPERM2I128 $0x02, CC1, DD1, BB0
-	VPERM2I128 $0x13, AA1, BB1, CC0
-	VPERM2I128 $0x13, CC1, DD1, DD0
-	VPXOR      (4*32)(inp), AA0, AA0; VPXOR (5*32)(inp), BB0, BB0; VPXOR (6*32)(inp), CC0, CC0; VPXOR (7*32)(inp), DD0, DD0
-	VMOVDQU    AA0, (4*32)(oup); VMOVDQU BB0, (5*32)(oup); VMOVDQU CC0, (6*32)(oup); VMOVDQU DD0, (7*32)(oup)
-
-	VPERM2I128 $0x02, AA2, BB2, AA0
-	VPERM2I128 $0x02, CC2, DD2, BB0
-	VPERM2I128 $0x13, AA2, BB2, CC0
-	VPERM2I128 $0x13, CC2, DD2, DD0
-	VPXOR      (8*32)(inp), AA0, AA0; VPXOR (9*32)(inp), BB0, BB0; VPXOR (10*32)(inp), CC0, CC0; VPXOR (11*32)(inp), DD0, DD0
-	VMOVDQU    AA0, (8*32)(oup); VMOVDQU BB0, (9*32)(oup); VMOVDQU CC0, (10*32)(oup); VMOVDQU DD0, (11*32)(oup)
-
-	MOVQ       $384, itr1
-	LEAQ       384(inp), inp
-	SUBQ       $384, inl
-	VPERM2I128 $0x02, AA3, BB3, AA0
-	VPERM2I128 $0x02, tmpStoreAVX2, DD3, BB0
-	VPERM2I128 $0x13, AA3, BB3, CC0
-	VPERM2I128 $0x13, tmpStoreAVX2, DD3, DD0
-
-	JMP sealAVX2SealHash
+	VPADDD     Y14, Y0, Y0
+	VPADDD     Y9, Y5, Y5
+	VPADDD     Y10, Y6, Y6
+	VPADDD     Y11, Y7, Y7
+	VPXOR      Y0, Y4, Y4
+	VPXOR      Y5, Y1, Y1
+	VPXOR      Y6, Y2, Y2
+	VPXOR      Y7, Y3, Y3
+	VPSHUFB    ·rol16<>+0(SB), Y4, Y4
+	VPSHUFB    ·rol16<>+0(SB), Y1, Y1
+	VPSHUFB    ·rol16<>+0(SB), Y2, Y2
+	VPSHUFB    ·rol16<>+0(SB), Y3, Y3
+	VPADDD     Y4, Y12, Y12
+	VPADDD     Y1, Y13, Y13
+	VPADDD     Y2, Y8, Y8
+	VPADDD     Y3, Y15, Y15
+	VPXOR      Y12, Y14, Y14
+	VPXOR      Y13, Y9, Y9
+	VPXOR      Y8, Y10, Y10
+	VPXOR      Y15, Y11, Y11
+	VMOVDQA    Y15, 224(BP)
+	VPSLLD     $0x0c, Y14, Y15
+	VPSRLD     $0x14, Y14, Y14
+	VPXOR      Y15, Y14, Y14
+	VPSLLD     $0x0c, Y9, Y15
+	VPSRLD     $0x14, Y9, Y9
+	VPXOR      Y15, Y9, Y9
+	VPSLLD     $0x0c, Y10, Y15
+	VPSRLD     $0x14, Y10, Y10
+	VPXOR      Y15, Y10, Y10
+	VPSLLD     $0x0c, Y11, Y15
+	VPSRLD     $0x14, Y11, Y11
+	VPXOR      Y15, Y11, Y11
+	VMOVDQA    224(BP), Y15
+	ADDQ       (DI), R10
+	ADCQ       8(DI), R11
+	ADCQ       $0x01, R12
+	MOVQ       (BP), DX
+	MOVQ       DX, R15
+	MULXQ      R10, R13, R14
+	IMULQ      R12, R15
+	MULXQ      R11, AX, DX
+	ADDQ       AX, R14
+	ADCQ       DX, R15
+	MOVQ       8(BP), DX
+	MULXQ      R10, R10, AX
+	ADDQ       R10, R14
+	MULXQ      R11, R11, R8
+	ADCQ       R11, R15
+	ADCQ       $0x00, R8
+	IMULQ      R12, DX
+	ADDQ       AX, R15
+	ADCQ       DX, R8
+	MOVQ       R13, R10
+	MOVQ       R14, R11
+	MOVQ       R15, R12
+	ANDQ       $0x03, R12
+	MOVQ       R15, R13
+	ANDQ       $-4, R13
+	MOVQ       R8, R14
+	SHRQ       $0x02, R8, R15
+	SHRQ       $0x02, R8
+	ADDQ       R13, R10
+	ADCQ       R14, R11
+	ADCQ       $0x00, R12
+	ADDQ       R15, R10
+	ADCQ       R8, R11
+	ADCQ       $0x00, R12
+	VPADDD     Y14, Y0, Y0
+	VPADDD     Y9, Y5, Y5
+	VPADDD     Y10, Y6, Y6
+	VPADDD     Y11, Y7, Y7
+	VPXOR      Y0, Y4, Y4
+	VPXOR      Y5, Y1, Y1
+	VPXOR      Y6, Y2, Y2
+	VPXOR      Y7, Y3, Y3
+	VPSHUFB    ·rol8<>+0(SB), Y4, Y4
+	VPSHUFB    ·rol8<>+0(SB), Y1, Y1
+	VPSHUFB    ·rol8<>+0(SB), Y2, Y2
+	VPSHUFB    ·rol8<>+0(SB), Y3, Y3
+	VPADDD     Y4, Y12, Y12
+	VPADDD     Y1, Y13, Y13
+	VPADDD     Y2, Y8, Y8
+	VPADDD     Y3, Y15, Y15
+	VPXOR      Y12, Y14, Y14
+	VPXOR      Y13, Y9, Y9
+	VPXOR      Y8, Y10, Y10
+	VPXOR      Y15, Y11, Y11
+	VMOVDQA    Y15, 224(BP)
+	VPSLLD     $0x07, Y14, Y15
+	VPSRLD     $0x19, Y14, Y14
+	VPXOR      Y15, Y14, Y14
+	VPSLLD     $0x07, Y9, Y15
+	VPSRLD     $0x19, Y9, Y9
+	VPXOR      Y15, Y9, Y9
+	VPSLLD     $0x07, Y10, Y15
+	VPSRLD     $0x19, Y10, Y10
+	VPXOR      Y15, Y10, Y10
+	VPSLLD     $0x07, Y11, Y15
+	VPSRLD     $0x19, Y11, Y11
+	VPXOR      Y15, Y11, Y11
+	VMOVDQA    224(BP), Y15
+	VPALIGNR   $0x04, Y14, Y14, Y14
+	VPALIGNR   $0x04, Y9, Y9, Y9
+	VPALIGNR   $0x04, Y10, Y10, Y10
+	VPALIGNR   $0x04, Y11, Y11, Y11
+	VPALIGNR   $0x08, Y12, Y12, Y12
+	VPALIGNR   $0x08, Y13, Y13, Y13
+	VPALIGNR   $0x08, Y8, Y8, Y8
+	VPALIGNR   $0x08, Y15, Y15, Y15
+	VPALIGNR   $0x0c, Y4, Y4, Y4
+	VPALIGNR   $0x0c, Y1, Y1, Y1
+	VPALIGNR   $0x0c, Y2, Y2, Y2
+	VPALIGNR   $0x0c, Y3, Y3, Y3
+	VPADDD     Y14, Y0, Y0
+	VPADDD     Y9, Y5, Y5
+	VPADDD     Y10, Y6, Y6
+	VPADDD     Y11, Y7, Y7
+	VPXOR      Y0, Y4, Y4
+	VPXOR      Y5, Y1, Y1
+	VPXOR      Y6, Y2, Y2
+	VPXOR      Y7, Y3, Y3
+	VPSHUFB    ·rol16<>+0(SB), Y4, Y4
+	VPSHUFB    ·rol16<>+0(SB), Y1, Y1
+	VPSHUFB    ·rol16<>+0(SB), Y2, Y2
+	VPSHUFB    ·rol16<>+0(SB), Y3, Y3
+	VPADDD     Y4, Y12, Y12
+	VPADDD     Y1, Y13, Y13
+	VPADDD     Y2, Y8, Y8
+	VPADDD     Y3, Y15, Y15
+	VPXOR      Y12, Y14, Y14
+	VPXOR      Y13, Y9, Y9
+	VPXOR      Y8, Y10, Y10
+	VPXOR      Y15, Y11, Y11
+	ADDQ       16(DI), R10
+	ADCQ       24(DI), R11
+	ADCQ       $0x01, R12
+	MOVQ       (BP), DX
+	MOVQ       DX, R15
+	MULXQ      R10, R13, R14
+	IMULQ      R12, R15
+	MULXQ      R11, AX, DX
+	ADDQ       AX, R14
+	ADCQ       DX, R15
+	MOVQ       8(BP), DX
+	MULXQ      R10, R10, AX
+	ADDQ       R10, R14
+	MULXQ      R11, R11, R8
+	ADCQ       R11, R15
+	ADCQ       $0x00, R8
+	IMULQ      R12, DX
+	ADDQ       AX, R15
+	ADCQ       DX, R8
+	MOVQ       R13, R10
+	MOVQ       R14, R11
+	MOVQ       R15, R12
+	ANDQ       $0x03, R12
+	MOVQ       R15, R13
+	ANDQ       $-4, R13
+	MOVQ       R8, R14
+	SHRQ       $0x02, R8, R15
+	SHRQ       $0x02, R8
+	ADDQ       R13, R10
+	ADCQ       R14, R11
+	ADCQ       $0x00, R12
+	ADDQ       R15, R10
+	ADCQ       R8, R11
+	ADCQ       $0x00, R12
+	LEAQ       32(DI), DI
+	VMOVDQA    Y15, 224(BP)
+	VPSLLD     $0x0c, Y14, Y15
+	VPSRLD     $0x14, Y14, Y14
+	VPXOR      Y15, Y14, Y14
+	VPSLLD     $0x0c, Y9, Y15
+	VPSRLD     $0x14, Y9, Y9
+	VPXOR      Y15, Y9, Y9
+	VPSLLD     $0x0c, Y10, Y15
+	VPSRLD     $0x14, Y10, Y10
+	VPXOR      Y15, Y10, Y10
+	VPSLLD     $0x0c, Y11, Y15
+	VPSRLD     $0x14, Y11, Y11
+	VPXOR      Y15, Y11, Y11
+	VMOVDQA    224(BP), Y15
+	VPADDD     Y14, Y0, Y0
+	VPADDD     Y9, Y5, Y5
+	VPADDD     Y10, Y6, Y6
+	VPADDD     Y11, Y7, Y7
+	VPXOR      Y0, Y4, Y4
+	VPXOR      Y5, Y1, Y1
+	VPXOR      Y6, Y2, Y2
+	VPXOR      Y7, Y3, Y3
+	VPSHUFB    ·rol8<>+0(SB), Y4, Y4
+	VPSHUFB    ·rol8<>+0(SB), Y1, Y1
+	VPSHUFB    ·rol8<>+0(SB), Y2, Y2
+	VPSHUFB    ·rol8<>+0(SB), Y3, Y3
+	VPADDD     Y4, Y12, Y12
+	VPADDD     Y1, Y13, Y13
+	VPADDD     Y2, Y8, Y8
+	VPADDD     Y3, Y15, Y15
+	VPXOR      Y12, Y14, Y14
+	VPXOR      Y13, Y9, Y9
+	VPXOR      Y8, Y10, Y10
+	VPXOR      Y15, Y11, Y11
+	VMOVDQA    Y15, 224(BP)
+	VPSLLD     $0x07, Y14, Y15
+	VPSRLD     $0x19, Y14, Y14
+	VPXOR      Y15, Y14, Y14
+	VPSLLD     $0x07, Y9, Y15
+	VPSRLD     $0x19, Y9, Y9
+	VPXOR      Y15, Y9, Y9
+	VPSLLD     $0x07, Y10, Y15
+	VPSRLD     $0x19, Y10, Y10
+	VPXOR      Y15, Y10, Y10
+	VPSLLD     $0x07, Y11, Y15
+	VPSRLD     $0x19, Y11, Y11
+	VPXOR      Y15, Y11, Y11
+	VMOVDQA    224(BP), Y15
+	VPALIGNR   $0x0c, Y14, Y14, Y14
+	VPALIGNR   $0x0c, Y9, Y9, Y9
+	VPALIGNR   $0x0c, Y10, Y10, Y10
+	VPALIGNR   $0x0c, Y11, Y11, Y11
+	VPALIGNR   $0x08, Y12, Y12, Y12
+	VPALIGNR   $0x08, Y13, Y13, Y13
+	VPALIGNR   $0x08, Y8, Y8, Y8
+	VPALIGNR   $0x08, Y15, Y15, Y15
+	VPALIGNR   $0x04, Y4, Y4, Y4
+	VPALIGNR   $0x04, Y1, Y1, Y1
+	VPALIGNR   $0x04, Y2, Y2, Y2
+	VPALIGNR   $0x04, Y3, Y3, Y3
+	DECQ       CX
+	JG         sealAVX2Tail512LoopA
+	DECQ       R9
+	JGE        sealAVX2Tail512LoopB
+	VPADDD     ·chacha20Constants<>+0(SB), Y0, Y0
+	VPADDD     ·chacha20Constants<>+0(SB), Y5, Y5
+	VPADDD     ·chacha20Constants<>+0(SB), Y6, Y6
+	VPADDD     ·chacha20Constants<>+0(SB), Y7, Y7
+	VPADDD     32(BP), Y14, Y14
+	VPADDD     32(BP), Y9, Y9
+	VPADDD     32(BP), Y10, Y10
+	VPADDD     32(BP), Y11, Y11
+	VPADDD     64(BP), Y12, Y12
+	VPADDD     64(BP), Y13, Y13
+	VPADDD     64(BP), Y8, Y8
+	VPADDD     64(BP), Y15, Y15
+	VPADDD     96(BP), Y4, Y4
+	VPADDD     128(BP), Y1, Y1
+	VPADDD     160(BP), Y2, Y2
+	VPADDD     192(BP), Y3, Y3
+	VMOVDQA    Y15, 224(BP)
+	VPERM2I128 $0x02, Y0, Y14, Y15
+	VPXOR      (SI), Y15, Y15
+	VMOVDQU    Y15, (DI)
+	VPERM2I128 $0x02, Y12, Y4, Y15
+	VPXOR      32(SI), Y15, Y15
+	VMOVDQU    Y15, 32(DI)
+	VPERM2I128 $0x13, Y0, Y14, Y15
+	VPXOR      64(SI), Y15, Y15
+	VMOVDQU    Y15, 64(DI)
+	VPERM2I128 $0x13, Y12, Y4, Y15
+	VPXOR      96(SI), Y15, Y15
+	VMOVDQU    Y15, 96(DI)
+	VPERM2I128 $0x02, Y5, Y9, Y0
+	VPERM2I128 $0x02, Y13, Y1, Y14
+	VPERM2I128 $0x13, Y5, Y9, Y12
+	VPERM2I128 $0x13, Y13, Y1, Y4
+	VPXOR      128(SI), Y0, Y0
+	VPXOR      160(SI), Y14, Y14
+	VPXOR      192(SI), Y12, Y12
+	VPXOR      224(SI), Y4, Y4
+	VMOVDQU    Y0, 128(DI)
+	VMOVDQU    Y14, 160(DI)
+	VMOVDQU    Y12, 192(DI)
+	VMOVDQU    Y4, 224(DI)
+	VPERM2I128 $0x02, Y6, Y10, Y0
+	VPERM2I128 $0x02, Y8, Y2, Y14
+	VPERM2I128 $0x13, Y6, Y10, Y12
+	VPERM2I128 $0x13, Y8, Y2, Y4
+	VPXOR      256(SI), Y0, Y0
+	VPXOR      288(SI), Y14, Y14
+	VPXOR      320(SI), Y12, Y12
+	VPXOR      352(SI), Y4, Y4
+	VMOVDQU    Y0, 256(DI)
+	VMOVDQU    Y14, 288(DI)
+	VMOVDQU    Y12, 320(DI)
+	VMOVDQU    Y4, 352(DI)
+	MOVQ       $0x00000180, CX
+	LEAQ       384(SI), SI
+	SUBQ       $0x00000180, BX
+	VPERM2I128 $0x02, Y7, Y11, Y0
+	VPERM2I128 $0x02, 224(BP), Y3, Y14
+	VPERM2I128 $0x13, Y7, Y11, Y12
+	VPERM2I128 $0x13, 224(BP), Y3, Y4
+	JMP        sealAVX2SealHash
diff --git a/src/vendor/golang.org/x/crypto/cryptobyte/asn1/asn1.go b/src/vendor/golang.org/x/crypto/cryptobyte/asn1/asn1.go
index cda8e3ed..90ef6a24 100644
--- a/src/vendor/golang.org/x/crypto/cryptobyte/asn1/asn1.go
+++ b/src/vendor/golang.org/x/crypto/cryptobyte/asn1/asn1.go
@@ -4,7 +4,7 @@
 
 // Package asn1 contains supporting types for parsing and building ASN.1
 // messages with the cryptobyte package.
-package asn1 // import "golang.org/x/crypto/cryptobyte/asn1"
+package asn1
 
 // Tag represents an ASN.1 identifier octet, consisting of a tag number
 // (indicating a type) and class (such as context-specific or constructed).
diff --git a/src/vendor/golang.org/x/crypto/cryptobyte/string.go b/src/vendor/golang.org/x/crypto/cryptobyte/string.go
index 10692a8a..4b0f8097 100644
--- a/src/vendor/golang.org/x/crypto/cryptobyte/string.go
+++ b/src/vendor/golang.org/x/crypto/cryptobyte/string.go
@@ -15,7 +15,7 @@
 //
 // See the documentation and examples for the Builder and String types to get
 // started.
-package cryptobyte // import "golang.org/x/crypto/cryptobyte"
+package cryptobyte
 
 // String represents a string of bytes. It provides methods for parsing
 // fixed-length and length-prefixed values from it.
diff --git a/src/vendor/golang.org/x/crypto/hkdf/hkdf.go b/src/vendor/golang.org/x/crypto/hkdf/hkdf.go
deleted file mode 100644
index f4ded5fe..00000000
--- a/src/vendor/golang.org/x/crypto/hkdf/hkdf.go
+++ /dev/null
@@ -1,95 +0,0 @@
-// Copyright 2014 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// Package hkdf implements the HMAC-based Extract-and-Expand Key Derivation
-// Function (HKDF) as defined in RFC 5869.
-//
-// HKDF is a cryptographic key derivation function (KDF) with the goal of
-// expanding limited input keying material into one or more cryptographically
-// strong secret keys.
-package hkdf // import "golang.org/x/crypto/hkdf"
-
-import (
-	"crypto/hmac"
-	"errors"
-	"hash"
-	"io"
-)
-
-// Extract generates a pseudorandom key for use with Expand from an input secret
-// and an optional independent salt.
-//
-// Only use this function if you need to reuse the extracted key with multiple
-// Expand invocations and different context values. Most common scenarios,
-// including the generation of multiple keys, should use New instead.
-func Extract(hash func() hash.Hash, secret, salt []byte) []byte {
-	if salt == nil {
-		salt = make([]byte, hash().Size())
-	}
-	extractor := hmac.New(hash, salt)
-	extractor.Write(secret)
-	return extractor.Sum(nil)
-}
-
-type hkdf struct {
-	expander hash.Hash
-	size     int
-
-	info    []byte
-	counter byte
-
-	prev []byte
-	buf  []byte
-}
-
-func (f *hkdf) Read(p []byte) (int, error) {
-	// Check whether enough data can be generated
-	need := len(p)
-	remains := len(f.buf) + int(255-f.counter+1)*f.size
-	if remains < need {
-		return 0, errors.New("hkdf: entropy limit reached")
-	}
-	// Read any leftover from the buffer
-	n := copy(p, f.buf)
-	p = p[n:]
-
-	// Fill the rest of the buffer
-	for len(p) > 0 {
-		if f.counter > 1 {
-			f.expander.Reset()
-		}
-		f.expander.Write(f.prev)
-		f.expander.Write(f.info)
-		f.expander.Write([]byte{f.counter})
-		f.prev = f.expander.Sum(f.prev[:0])
-		f.counter++
-
-		// Copy the new batch into p
-		f.buf = f.prev
-		n = copy(p, f.buf)
-		p = p[n:]
-	}
-	// Save leftovers for next run
-	f.buf = f.buf[n:]
-
-	return need, nil
-}
-
-// Expand returns a Reader, from which keys can be read, using the given
-// pseudorandom key and optional context info, skipping the extraction step.
-//
-// The pseudorandomKey should have been generated by Extract, or be a uniformly
-// random or pseudorandom cryptographically strong key. See RFC 5869, Section
-// 3.3. Most common scenarios will want to use New instead.
-func Expand(hash func() hash.Hash, pseudorandomKey, info []byte) io.Reader {
-	expander := hmac.New(hash, pseudorandomKey)
-	return &hkdf{expander, expander.Size(), info, 1, nil, nil}
-}
-
-// New returns a Reader, from which keys can be read, using the given hash,
-// secret, salt and context info. Salt and info can be nil.
-func New(hash func() hash.Hash, secret, salt, info []byte) io.Reader {
-	prk := Extract(hash, secret, salt)
-	return Expand(hash, prk, info)
-}
diff --git a/src/vendor/golang.org/x/crypto/internal/poly1305/mac_noasm.go b/src/vendor/golang.org/x/crypto/internal/poly1305/mac_noasm.go
index 333da285..bd896bdc 100644
--- a/src/vendor/golang.org/x/crypto/internal/poly1305/mac_noasm.go
+++ b/src/vendor/golang.org/x/crypto/internal/poly1305/mac_noasm.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build (!amd64 && !ppc64le && !s390x) || !gc || purego
+//go:build (!amd64 && !ppc64le && !ppc64 && !s390x) || !gc || purego
 
 package poly1305
 
diff --git a/src/vendor/golang.org/x/crypto/internal/poly1305/sum_amd64.s b/src/vendor/golang.org/x/crypto/internal/poly1305/sum_amd64.s
index e0d3c647..13375738 100644
--- a/src/vendor/golang.org/x/crypto/internal/poly1305/sum_amd64.s
+++ b/src/vendor/golang.org/x/crypto/internal/poly1305/sum_amd64.s
@@ -1,108 +1,93 @@
-// Copyright 2012 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// Code generated by command: go run sum_amd64_asm.go -out ../sum_amd64.s -pkg poly1305. DO NOT EDIT.
 
 //go:build gc && !purego
 
-#include "textflag.h"
-
-#define POLY1305_ADD(msg, h0, h1, h2) \
-	ADDQ 0(msg), h0;  \
-	ADCQ 8(msg), h1;  \
-	ADCQ $1, h2;      \
-	LEAQ 16(msg), msg
-
-#define POLY1305_MUL(h0, h1, h2, r0, r1, t0, t1, t2, t3) \
-	MOVQ  r0, AX;                  \
-	MULQ  h0;                      \
-	MOVQ  AX, t0;                  \
-	MOVQ  DX, t1;                  \
-	MOVQ  r0, AX;                  \
-	MULQ  h1;                      \
-	ADDQ  AX, t1;                  \
-	ADCQ  $0, DX;                  \
-	MOVQ  r0, t2;                  \
-	IMULQ h2, t2;                  \
-	ADDQ  DX, t2;                  \
-	                               \
-	MOVQ  r1, AX;                  \
-	MULQ  h0;                      \
-	ADDQ  AX, t1;                  \
-	ADCQ  $0, DX;                  \
-	MOVQ  DX, h0;                  \
-	MOVQ  r1, t3;                  \
-	IMULQ h2, t3;                  \
-	MOVQ  r1, AX;                  \
-	MULQ  h1;                      \
-	ADDQ  AX, t2;                  \
-	ADCQ  DX, t3;                  \
-	ADDQ  h0, t2;                  \
-	ADCQ  $0, t3;                  \
-	                               \
-	MOVQ  t0, h0;                  \
-	MOVQ  t1, h1;                  \
-	MOVQ  t2, h2;                  \
-	ANDQ  $3, h2;                  \
-	MOVQ  t2, t0;                  \
-	ANDQ  $0xFFFFFFFFFFFFFFFC, t0; \
-	ADDQ  t0, h0;                  \
-	ADCQ  t3, h1;                  \
-	ADCQ  $0, h2;                  \
-	SHRQ  $2, t3, t2;              \
-	SHRQ  $2, t3;                  \
-	ADDQ  t2, h0;                  \
-	ADCQ  t3, h1;                  \
-	ADCQ  $0, h2
-
-// func update(state *[7]uint64, msg []byte)
+// func update(state *macState, msg []byte)
 TEXT ·update(SB), $0-32
 	MOVQ state+0(FP), DI
 	MOVQ msg_base+8(FP), SI
 	MOVQ msg_len+16(FP), R15
-
-	MOVQ 0(DI), R8   // h0
-	MOVQ 8(DI), R9   // h1
-	MOVQ 16(DI), R10 // h2
-	MOVQ 24(DI), R11 // r0
-	MOVQ 32(DI), R12 // r1
-
-	CMPQ R15, $16
+	MOVQ (DI), R8
+	MOVQ 8(DI), R9
+	MOVQ 16(DI), R10
+	MOVQ 24(DI), R11
+	MOVQ 32(DI), R12
+	CMPQ R15, $0x10
 	JB   bytes_between_0_and_15
 
 loop:
-	POLY1305_ADD(SI, R8, R9, R10)
+	ADDQ (SI), R8
+	ADCQ 8(SI), R9
+	ADCQ $0x01, R10
+	LEAQ 16(SI), SI
 
 multiply:
-	POLY1305_MUL(R8, R9, R10, R11, R12, BX, CX, R13, R14)
-	SUBQ $16, R15
-	CMPQ R15, $16
-	JAE  loop
+	MOVQ  R11, AX
+	MULQ  R8
+	MOVQ  AX, BX
+	MOVQ  DX, CX
+	MOVQ  R11, AX
+	MULQ  R9
+	ADDQ  AX, CX
+	ADCQ  $0x00, DX
+	MOVQ  R11, R13
+	IMULQ R10, R13
+	ADDQ  DX, R13
+	MOVQ  R12, AX
+	MULQ  R8
+	ADDQ  AX, CX
+	ADCQ  $0x00, DX
+	MOVQ  DX, R8
+	MOVQ  R12, R14
+	IMULQ R10, R14
+	MOVQ  R12, AX
+	MULQ  R9
+	ADDQ  AX, R13
+	ADCQ  DX, R14
+	ADDQ  R8, R13
+	ADCQ  $0x00, R14
+	MOVQ  BX, R8
+	MOVQ  CX, R9
+	MOVQ  R13, R10
+	ANDQ  $0x03, R10
+	MOVQ  R13, BX
+	ANDQ  $-4, BX
+	ADDQ  BX, R8
+	ADCQ  R14, R9
+	ADCQ  $0x00, R10
+	SHRQ  $0x02, R14, R13
+	SHRQ  $0x02, R14
+	ADDQ  R13, R8
+	ADCQ  R14, R9
+	ADCQ  $0x00, R10
+	SUBQ  $0x10, R15
+	CMPQ  R15, $0x10
+	JAE   loop
 
 bytes_between_0_and_15:
 	TESTQ R15, R15
 	JZ    done
-	MOVQ  $1, BX
+	MOVQ  $0x00000001, BX
 	XORQ  CX, CX
 	XORQ  R13, R13
 	ADDQ  R15, SI
 
 flush_buffer:
-	SHLQ $8, BX, CX
-	SHLQ $8, BX
+	SHLQ $0x08, BX, CX
+	SHLQ $0x08, BX
 	MOVB -1(SI), R13
 	XORQ R13, BX
 	DECQ SI
 	DECQ R15
 	JNZ  flush_buffer
-
 	ADDQ BX, R8
 	ADCQ CX, R9
-	ADCQ $0, R10
-	MOVQ $16, R15
+	ADCQ $0x00, R10
+	MOVQ $0x00000010, R15
 	JMP  multiply
 
 done:
-	MOVQ R8, 0(DI)
+	MOVQ R8, (DI)
 	MOVQ R9, 8(DI)
 	MOVQ R10, 16(DI)
 	RET
diff --git a/src/vendor/golang.org/x/crypto/internal/poly1305/sum_ppc64le.go b/src/vendor/golang.org/x/crypto/internal/poly1305/sum_ppc64x.go
similarity index 95%
rename from src/vendor/golang.org/x/crypto/internal/poly1305/sum_ppc64le.go
rename to src/vendor/golang.org/x/crypto/internal/poly1305/sum_ppc64x.go
index 4aec4874..1a1679aa 100644
--- a/src/vendor/golang.org/x/crypto/internal/poly1305/sum_ppc64le.go
+++ b/src/vendor/golang.org/x/crypto/internal/poly1305/sum_ppc64x.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build gc && !purego
+//go:build gc && !purego && (ppc64 || ppc64le)
 
 package poly1305
 
diff --git a/src/vendor/golang.org/x/crypto/internal/poly1305/sum_ppc64le.s b/src/vendor/golang.org/x/crypto/internal/poly1305/sum_ppc64x.s
similarity index 89%
rename from src/vendor/golang.org/x/crypto/internal/poly1305/sum_ppc64le.s
rename to src/vendor/golang.org/x/crypto/internal/poly1305/sum_ppc64x.s
index b3c1699b..6899a1da 100644
--- a/src/vendor/golang.org/x/crypto/internal/poly1305/sum_ppc64le.s
+++ b/src/vendor/golang.org/x/crypto/internal/poly1305/sum_ppc64x.s
@@ -2,15 +2,25 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build gc && !purego
+//go:build gc && !purego && (ppc64 || ppc64le)
 
 #include "textflag.h"
 
 // This was ported from the amd64 implementation.
 
+#ifdef GOARCH_ppc64le
+#define LE_MOVD MOVD
+#define LE_MOVWZ MOVWZ
+#define LE_MOVHZ MOVHZ
+#else
+#define LE_MOVD MOVDBR
+#define LE_MOVWZ MOVWBR
+#define LE_MOVHZ MOVHBR
+#endif
+
 #define POLY1305_ADD(msg, h0, h1, h2, t0, t1, t2) \
-	MOVD (msg), t0;  \
-	MOVD 8(msg), t1; \
+	LE_MOVD (msg)( R0), t0; \
+	LE_MOVD (msg)(R24), t1; \
 	MOVD $1, t2;     \
 	ADDC t0, h0, h0; \
 	ADDE t1, h1, h1; \
@@ -50,10 +60,6 @@
 	ADDE   t3, h1, h1;  \
 	ADDZE  h2
 
-DATA ·poly1305Mask<>+0x00(SB)/8, $0x0FFFFFFC0FFFFFFF
-DATA ·poly1305Mask<>+0x08(SB)/8, $0x0FFFFFFC0FFFFFFC
-GLOBL ·poly1305Mask<>(SB), RODATA, $16
-
 // func update(state *[7]uint64, msg []byte)
 TEXT ·update(SB), $0-32
 	MOVD state+0(FP), R3
@@ -66,6 +72,8 @@ TEXT ·update(SB), $0-32
 	MOVD 24(R3), R11 // r0
 	MOVD 32(R3), R12 // r1
 
+	MOVD $8, R24
+
 	CMP R5, $16
 	BLT bytes_between_0_and_15
 
@@ -94,7 +102,7 @@ flush_buffer:
 
 	// Greater than 8 -- load the rightmost remaining bytes in msg
 	// and put into R17 (h1)
-	MOVD (R4)(R21), R17
+	LE_MOVD (R4)(R21), R17
 	MOVD $16, R22
 
 	// Find the offset to those bytes
@@ -118,7 +126,7 @@ just1:
 	BLT less8
 
 	// Exactly 8
-	MOVD (R4), R16
+	LE_MOVD (R4), R16
 
 	CMP R17, $0
 
@@ -133,7 +141,7 @@ less8:
 	MOVD  $0, R22   // shift count
 	CMP   R5, $4
 	BLT   less4
-	MOVWZ (R4), R16
+	LE_MOVWZ (R4), R16
 	ADD   $4, R4
 	ADD   $-4, R5
 	MOVD  $32, R22
@@ -141,7 +149,7 @@ less8:
 less4:
 	CMP   R5, $2
 	BLT   less2
-	MOVHZ (R4), R21
+	LE_MOVHZ (R4), R21
 	SLD   R22, R21, R21
 	OR    R16, R21, R16
 	ADD   $16, R22
diff --git a/src/vendor/golang.org/x/crypto/sha3/doc.go b/src/vendor/golang.org/x/crypto/sha3/doc.go
deleted file mode 100644
index decd8cf9..00000000
--- a/src/vendor/golang.org/x/crypto/sha3/doc.go
+++ /dev/null
@@ -1,62 +0,0 @@
-// Copyright 2014 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// Package sha3 implements the SHA-3 fixed-output-length hash functions and
-// the SHAKE variable-output-length hash functions defined by FIPS-202.
-//
-// Both types of hash function use the "sponge" construction and the Keccak
-// permutation. For a detailed specification see http://keccak.noekeon.org/
-//
-// # Guidance
-//
-// If you aren't sure what function you need, use SHAKE256 with at least 64
-// bytes of output. The SHAKE instances are faster than the SHA3 instances;
-// the latter have to allocate memory to conform to the hash.Hash interface.
-//
-// If you need a secret-key MAC (message authentication code), prepend the
-// secret key to the input, hash with SHAKE256 and read at least 32 bytes of
-// output.
-//
-// # Security strengths
-//
-// The SHA3-x (x equals 224, 256, 384, or 512) functions have a security
-// strength against preimage attacks of x bits. Since they only produce "x"
-// bits of output, their collision-resistance is only "x/2" bits.
-//
-// The SHAKE-256 and -128 functions have a generic security strength of 256 and
-// 128 bits against all attacks, provided that at least 2x bits of their output
-// is used.  Requesting more than 64 or 32 bytes of output, respectively, does
-// not increase the collision-resistance of the SHAKE functions.
-//
-// # The sponge construction
-//
-// A sponge builds a pseudo-random function from a public pseudo-random
-// permutation, by applying the permutation to a state of "rate + capacity"
-// bytes, but hiding "capacity" of the bytes.
-//
-// A sponge starts out with a zero state. To hash an input using a sponge, up
-// to "rate" bytes of the input are XORed into the sponge's state. The sponge
-// is then "full" and the permutation is applied to "empty" it. This process is
-// repeated until all the input has been "absorbed". The input is then padded.
-// The digest is "squeezed" from the sponge in the same way, except that output
-// is copied out instead of input being XORed in.
-//
-// A sponge is parameterized by its generic security strength, which is equal
-// to half its capacity; capacity + rate is equal to the permutation's width.
-// Since the KeccakF-1600 permutation is 1600 bits (200 bytes) wide, this means
-// that the security strength of a sponge instance is equal to (1600 - bitrate) / 2.
-//
-// # Recommendations
-//
-// The SHAKE functions are recommended for most new uses. They can produce
-// output of arbitrary length. SHAKE256, with an output length of at least
-// 64 bytes, provides 256-bit security against all attacks.  The Keccak team
-// recommends it for most applications upgrading from SHA2-512. (NIST chose a
-// much stronger, but much slower, sponge instance for SHA3-512.)
-//
-// The SHA-3 functions are "drop-in" replacements for the SHA-2 functions.
-// They produce output of the same length, with the same security strengths
-// against all attacks. This means, in particular, that SHA3-256 only has
-// 128-bit collision resistance, because its output length is 32 bytes.
-package sha3 // import "golang.org/x/crypto/sha3"
diff --git a/src/vendor/golang.org/x/crypto/sha3/hashes.go b/src/vendor/golang.org/x/crypto/sha3/hashes.go
deleted file mode 100644
index 5eae6cb9..00000000
--- a/src/vendor/golang.org/x/crypto/sha3/hashes.go
+++ /dev/null
@@ -1,101 +0,0 @@
-// Copyright 2014 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package sha3
-
-// This file provides functions for creating instances of the SHA-3
-// and SHAKE hash functions, as well as utility functions for hashing
-// bytes.
-
-import (
-	"hash"
-)
-
-// New224 creates a new SHA3-224 hash.
-// Its generic security strength is 224 bits against preimage attacks,
-// and 112 bits against collision attacks.
-func New224() hash.Hash {
-	return new224()
-}
-
-// New256 creates a new SHA3-256 hash.
-// Its generic security strength is 256 bits against preimage attacks,
-// and 128 bits against collision attacks.
-func New256() hash.Hash {
-	return new256()
-}
-
-// New384 creates a new SHA3-384 hash.
-// Its generic security strength is 384 bits against preimage attacks,
-// and 192 bits against collision attacks.
-func New384() hash.Hash {
-	return new384()
-}
-
-// New512 creates a new SHA3-512 hash.
-// Its generic security strength is 512 bits against preimage attacks,
-// and 256 bits against collision attacks.
-func New512() hash.Hash {
-	return new512()
-}
-
-func new224Generic() *state {
-	return &state{rate: 144, outputLen: 28, dsbyte: 0x06}
-}
-
-func new256Generic() *state {
-	return &state{rate: 136, outputLen: 32, dsbyte: 0x06}
-}
-
-func new384Generic() *state {
-	return &state{rate: 104, outputLen: 48, dsbyte: 0x06}
-}
-
-func new512Generic() *state {
-	return &state{rate: 72, outputLen: 64, dsbyte: 0x06}
-}
-
-// NewLegacyKeccak256 creates a new Keccak-256 hash.
-//
-// Only use this function if you require compatibility with an existing cryptosystem
-// that uses non-standard padding. All other users should use New256 instead.
-func NewLegacyKeccak256() hash.Hash { return &state{rate: 136, outputLen: 32, dsbyte: 0x01} }
-
-// NewLegacyKeccak512 creates a new Keccak-512 hash.
-//
-// Only use this function if you require compatibility with an existing cryptosystem
-// that uses non-standard padding. All other users should use New512 instead.
-func NewLegacyKeccak512() hash.Hash { return &state{rate: 72, outputLen: 64, dsbyte: 0x01} }
-
-// Sum224 returns the SHA3-224 digest of the data.
-func Sum224(data []byte) (digest [28]byte) {
-	h := New224()
-	h.Write(data)
-	h.Sum(digest[:0])
-	return
-}
-
-// Sum256 returns the SHA3-256 digest of the data.
-func Sum256(data []byte) (digest [32]byte) {
-	h := New256()
-	h.Write(data)
-	h.Sum(digest[:0])
-	return
-}
-
-// Sum384 returns the SHA3-384 digest of the data.
-func Sum384(data []byte) (digest [48]byte) {
-	h := New384()
-	h.Write(data)
-	h.Sum(digest[:0])
-	return
-}
-
-// Sum512 returns the SHA3-512 digest of the data.
-func Sum512(data []byte) (digest [64]byte) {
-	h := New512()
-	h.Write(data)
-	h.Sum(digest[:0])
-	return
-}
diff --git a/src/vendor/golang.org/x/crypto/sha3/hashes_noasm.go b/src/vendor/golang.org/x/crypto/sha3/hashes_noasm.go
deleted file mode 100644
index 9d85fb62..00000000
--- a/src/vendor/golang.org/x/crypto/sha3/hashes_noasm.go
+++ /dev/null
@@ -1,23 +0,0 @@
-// Copyright 2023 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-//go:build !gc || purego || !s390x
-
-package sha3
-
-func new224() *state {
-	return new224Generic()
-}
-
-func new256() *state {
-	return new256Generic()
-}
-
-func new384() *state {
-	return new384Generic()
-}
-
-func new512() *state {
-	return new512Generic()
-}
diff --git a/src/vendor/golang.org/x/crypto/sha3/keccakf_amd64.go b/src/vendor/golang.org/x/crypto/sha3/keccakf_amd64.go
deleted file mode 100644
index b908696b..00000000
--- a/src/vendor/golang.org/x/crypto/sha3/keccakf_amd64.go
+++ /dev/null
@@ -1,13 +0,0 @@
-// Copyright 2015 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-//go:build amd64 && !purego && gc
-
-package sha3
-
-// This function is implemented in keccakf_amd64.s.
-
-//go:noescape
-
-func keccakF1600(a *[25]uint64)
diff --git a/src/vendor/golang.org/x/crypto/sha3/keccakf_amd64.s b/src/vendor/golang.org/x/crypto/sha3/keccakf_amd64.s
deleted file mode 100644
index 1f539388..00000000
--- a/src/vendor/golang.org/x/crypto/sha3/keccakf_amd64.s
+++ /dev/null
@@ -1,390 +0,0 @@
-// Copyright 2015 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-//go:build amd64 && !purego && gc
-
-// This code was translated into a form compatible with 6a from the public
-// domain sources at https://github.com/gvanas/KeccakCodePackage
-
-// Offsets in state
-#define _ba  (0*8)
-#define _be  (1*8)
-#define _bi  (2*8)
-#define _bo  (3*8)
-#define _bu  (4*8)
-#define _ga  (5*8)
-#define _ge  (6*8)
-#define _gi  (7*8)
-#define _go  (8*8)
-#define _gu  (9*8)
-#define _ka (10*8)
-#define _ke (11*8)
-#define _ki (12*8)
-#define _ko (13*8)
-#define _ku (14*8)
-#define _ma (15*8)
-#define _me (16*8)
-#define _mi (17*8)
-#define _mo (18*8)
-#define _mu (19*8)
-#define _sa (20*8)
-#define _se (21*8)
-#define _si (22*8)
-#define _so (23*8)
-#define _su (24*8)
-
-// Temporary registers
-#define rT1  AX
-
-// Round vars
-#define rpState DI
-#define rpStack SP
-
-#define rDa BX
-#define rDe CX
-#define rDi DX
-#define rDo R8
-#define rDu R9
-
-#define rBa R10
-#define rBe R11
-#define rBi R12
-#define rBo R13
-#define rBu R14
-
-#define rCa SI
-#define rCe BP
-#define rCi rBi
-#define rCo rBo
-#define rCu R15
-
-#define MOVQ_RBI_RCE MOVQ rBi, rCe
-#define XORQ_RT1_RCA XORQ rT1, rCa
-#define XORQ_RT1_RCE XORQ rT1, rCe
-#define XORQ_RBA_RCU XORQ rBa, rCu
-#define XORQ_RBE_RCU XORQ rBe, rCu
-#define XORQ_RDU_RCU XORQ rDu, rCu
-#define XORQ_RDA_RCA XORQ rDa, rCa
-#define XORQ_RDE_RCE XORQ rDe, rCe
-
-#define mKeccakRound(iState, oState, rc, B_RBI_RCE, G_RT1_RCA, G_RT1_RCE, G_RBA_RCU, K_RT1_RCA, K_RT1_RCE, K_RBA_RCU, M_RT1_RCA, M_RT1_RCE, M_RBE_RCU, S_RDU_RCU, S_RDA_RCA, S_RDE_RCE) \
-	/* Prepare round */    \
-	MOVQ rCe, rDa;         \
-	ROLQ $1, rDa;          \
-	                       \
-	MOVQ _bi(iState), rCi; \
-	XORQ _gi(iState), rDi; \
-	XORQ rCu, rDa;         \
-	XORQ _ki(iState), rCi; \
-	XORQ _mi(iState), rDi; \
-	XORQ rDi, rCi;         \
-	                       \
-	MOVQ rCi, rDe;         \
-	ROLQ $1, rDe;          \
-	                       \
-	MOVQ _bo(iState), rCo; \
-	XORQ _go(iState), rDo; \
-	XORQ rCa, rDe;         \
-	XORQ _ko(iState), rCo; \
-	XORQ _mo(iState), rDo; \
-	XORQ rDo, rCo;         \
-	                       \
-	MOVQ rCo, rDi;         \
-	ROLQ $1, rDi;          \
-	                       \
-	MOVQ rCu, rDo;         \
-	XORQ rCe, rDi;         \
-	ROLQ $1, rDo;          \
-	                       \
-	MOVQ rCa, rDu;         \
-	XORQ rCi, rDo;         \
-	ROLQ $1, rDu;          \
-	                       \
-	/* Result b */         \
-	MOVQ _ba(iState), rBa; \
-	MOVQ _ge(iState), rBe; \
-	XORQ rCo, rDu;         \
-	MOVQ _ki(iState), rBi; \
-	MOVQ _mo(iState), rBo; \
-	MOVQ _su(iState), rBu; \
-	XORQ rDe, rBe;         \
-	ROLQ $44, rBe;         \
-	XORQ rDi, rBi;         \
-	XORQ rDa, rBa;         \
-	ROLQ $43, rBi;         \
-	                       \
-	MOVQ rBe, rCa;         \
-	MOVQ rc, rT1;          \
-	ORQ  rBi, rCa;         \
-	XORQ rBa, rT1;         \
-	XORQ rT1, rCa;         \
-	MOVQ rCa, _ba(oState); \
-	                       \
-	XORQ rDu, rBu;         \
-	ROLQ $14, rBu;         \
-	MOVQ rBa, rCu;         \
-	ANDQ rBe, rCu;         \
-	XORQ rBu, rCu;         \
-	MOVQ rCu, _bu(oState); \
-	                       \
-	XORQ rDo, rBo;         \
-	ROLQ $21, rBo;         \
-	MOVQ rBo, rT1;         \
-	ANDQ rBu, rT1;         \
-	XORQ rBi, rT1;         \
-	MOVQ rT1, _bi(oState); \
-	                       \
-	NOTQ rBi;              \
-	ORQ  rBa, rBu;         \
-	ORQ  rBo, rBi;         \
-	XORQ rBo, rBu;         \
-	XORQ rBe, rBi;         \
-	MOVQ rBu, _bo(oState); \
-	MOVQ rBi, _be(oState); \
-	B_RBI_RCE;             \
-	                       \
-	/* Result g */         \
-	MOVQ _gu(iState), rBe; \
-	XORQ rDu, rBe;         \
-	MOVQ _ka(iState), rBi; \
-	ROLQ $20, rBe;         \
-	XORQ rDa, rBi;         \
-	ROLQ $3, rBi;          \
-	MOVQ _bo(iState), rBa; \
-	MOVQ rBe, rT1;         \
-	ORQ  rBi, rT1;         \
-	XORQ rDo, rBa;         \
-	MOVQ _me(iState), rBo; \
-	MOVQ _si(iState), rBu; \
-	ROLQ $28, rBa;         \
-	XORQ rBa, rT1;         \
-	MOVQ rT1, _ga(oState); \
-	G_RT1_RCA;             \
-	                       \
-	XORQ rDe, rBo;         \
-	ROLQ $45, rBo;         \
-	MOVQ rBi, rT1;         \
-	ANDQ rBo, rT1;         \
-	XORQ rBe, rT1;         \
-	MOVQ rT1, _ge(oState); \
-	G_RT1_RCE;             \
-	                       \
-	XORQ rDi, rBu;         \
-	ROLQ $61, rBu;         \
-	MOVQ rBu, rT1;         \
-	ORQ  rBa, rT1;         \
-	XORQ rBo, rT1;         \
-	MOVQ rT1, _go(oState); \
-	                       \
-	ANDQ rBe, rBa;         \
-	XORQ rBu, rBa;         \
-	MOVQ rBa, _gu(oState); \
-	NOTQ rBu;              \
-	G_RBA_RCU;             \
-	                       \
-	ORQ  rBu, rBo;         \
-	XORQ rBi, rBo;         \
-	MOVQ rBo, _gi(oState); \
-	                       \
-	/* Result k */         \
-	MOVQ _be(iState), rBa; \
-	MOVQ _gi(iState), rBe; \
-	MOVQ _ko(iState), rBi; \
-	MOVQ _mu(iState), rBo; \
-	MOVQ _sa(iState), rBu; \
-	XORQ rDi, rBe;         \
-	ROLQ $6, rBe;          \
-	XORQ rDo, rBi;         \
-	ROLQ $25, rBi;         \
-	MOVQ rBe, rT1;         \
-	ORQ  rBi, rT1;         \
-	XORQ rDe, rBa;         \
-	ROLQ $1, rBa;          \
-	XORQ rBa, rT1;         \
-	MOVQ rT1, _ka(oState); \
-	K_RT1_RCA;             \
-	                       \
-	XORQ rDu, rBo;         \
-	ROLQ $8, rBo;          \
-	MOVQ rBi, rT1;         \
-	ANDQ rBo, rT1;         \
-	XORQ rBe, rT1;         \
-	MOVQ rT1, _ke(oState); \
-	K_RT1_RCE;             \
-	                       \
-	XORQ rDa, rBu;         \
-	ROLQ $18, rBu;         \
-	NOTQ rBo;              \
-	MOVQ rBo, rT1;         \
-	ANDQ rBu, rT1;         \
-	XORQ rBi, rT1;         \
-	MOVQ rT1, _ki(oState); \
-	                       \
-	MOVQ rBu, rT1;         \
-	ORQ  rBa, rT1;         \
-	XORQ rBo, rT1;         \
-	MOVQ rT1, _ko(oState); \
-	                       \
-	ANDQ rBe, rBa;         \
-	XORQ rBu, rBa;         \
-	MOVQ rBa, _ku(oState); \
-	K_RBA_RCU;             \
-	                       \
-	/* Result m */         \
-	MOVQ _ga(iState), rBe; \
-	XORQ rDa, rBe;         \
-	MOVQ _ke(iState), rBi; \
-	ROLQ $36, rBe;         \
-	XORQ rDe, rBi;         \
-	MOVQ _bu(iState), rBa; \
-	ROLQ $10, rBi;         \
-	MOVQ rBe, rT1;         \
-	MOVQ _mi(iState), rBo; \
-	ANDQ rBi, rT1;         \
-	XORQ rDu, rBa;         \
-	MOVQ _so(iState), rBu; \
-	ROLQ $27, rBa;         \
-	XORQ rBa, rT1;         \
-	MOVQ rT1, _ma(oState); \
-	M_RT1_RCA;             \
-	                       \
-	XORQ rDi, rBo;         \
-	ROLQ $15, rBo;         \
-	MOVQ rBi, rT1;         \
-	ORQ  rBo, rT1;         \
-	XORQ rBe, rT1;         \
-	MOVQ rT1, _me(oState); \
-	M_RT1_RCE;             \
-	                       \
-	XORQ rDo, rBu;         \
-	ROLQ $56, rBu;         \
-	NOTQ rBo;              \
-	MOVQ rBo, rT1;         \
-	ORQ  rBu, rT1;         \
-	XORQ rBi, rT1;         \
-	MOVQ rT1, _mi(oState); \
-	                       \
-	ORQ  rBa, rBe;         \
-	XORQ rBu, rBe;         \
-	MOVQ rBe, _mu(oState); \
-	                       \
-	ANDQ rBa, rBu;         \
-	XORQ rBo, rBu;         \
-	MOVQ rBu, _mo(oState); \
-	M_RBE_RCU;             \
-	                       \
-	/* Result s */         \
-	MOVQ _bi(iState), rBa; \
-	MOVQ _go(iState), rBe; \
-	MOVQ _ku(iState), rBi; \
-	XORQ rDi, rBa;         \
-	MOVQ _ma(iState), rBo; \
-	ROLQ $62, rBa;         \
-	XORQ rDo, rBe;         \
-	MOVQ _se(iState), rBu; \
-	ROLQ $55, rBe;         \
-	                       \
-	XORQ rDu, rBi;         \
-	MOVQ rBa, rDu;         \
-	XORQ rDe, rBu;         \
-	ROLQ $2, rBu;          \
-	ANDQ rBe, rDu;         \
-	XORQ rBu, rDu;         \
-	MOVQ rDu, _su(oState); \
-	                       \
-	ROLQ $39, rBi;         \
-	S_RDU_RCU;             \
-	NOTQ rBe;              \
-	XORQ rDa, rBo;         \
-	MOVQ rBe, rDa;         \
-	ANDQ rBi, rDa;         \
-	XORQ rBa, rDa;         \
-	MOVQ rDa, _sa(oState); \
-	S_RDA_RCA;             \
-	                       \
-	ROLQ $41, rBo;         \
-	MOVQ rBi, rDe;         \
-	ORQ  rBo, rDe;         \
-	XORQ rBe, rDe;         \
-	MOVQ rDe, _se(oState); \
-	S_RDE_RCE;             \
-	                       \
-	MOVQ rBo, rDi;         \
-	MOVQ rBu, rDo;         \
-	ANDQ rBu, rDi;         \
-	ORQ  rBa, rDo;         \
-	XORQ rBi, rDi;         \
-	XORQ rBo, rDo;         \
-	MOVQ rDi, _si(oState); \
-	MOVQ rDo, _so(oState)  \
-
-// func keccakF1600(a *[25]uint64)
-TEXT ·keccakF1600(SB), 0, $200-8
-	MOVQ a+0(FP), rpState
-
-	// Convert the user state into an internal state
-	NOTQ _be(rpState)
-	NOTQ _bi(rpState)
-	NOTQ _go(rpState)
-	NOTQ _ki(rpState)
-	NOTQ _mi(rpState)
-	NOTQ _sa(rpState)
-
-	// Execute the KeccakF permutation
-	MOVQ _ba(rpState), rCa
-	MOVQ _be(rpState), rCe
-	MOVQ _bu(rpState), rCu
-
-	XORQ _ga(rpState), rCa
-	XORQ _ge(rpState), rCe
-	XORQ _gu(rpState), rCu
-
-	XORQ _ka(rpState), rCa
-	XORQ _ke(rpState), rCe
-	XORQ _ku(rpState), rCu
-
-	XORQ _ma(rpState), rCa
-	XORQ _me(rpState), rCe
-	XORQ _mu(rpState), rCu
-
-	XORQ _sa(rpState), rCa
-	XORQ _se(rpState), rCe
-	MOVQ _si(rpState), rDi
-	MOVQ _so(rpState), rDo
-	XORQ _su(rpState), rCu
-
-	mKeccakRound(rpState, rpStack, $0x0000000000000001, MOVQ_RBI_RCE, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBE_RCU, XORQ_RDU_RCU, XORQ_RDA_RCA, XORQ_RDE_RCE)
-	mKeccakRound(rpStack, rpState, $0x0000000000008082, MOVQ_RBI_RCE, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBE_RCU, XORQ_RDU_RCU, XORQ_RDA_RCA, XORQ_RDE_RCE)
-	mKeccakRound(rpState, rpStack, $0x800000000000808a, MOVQ_RBI_RCE, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBE_RCU, XORQ_RDU_RCU, XORQ_RDA_RCA, XORQ_RDE_RCE)
-	mKeccakRound(rpStack, rpState, $0x8000000080008000, MOVQ_RBI_RCE, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBE_RCU, XORQ_RDU_RCU, XORQ_RDA_RCA, XORQ_RDE_RCE)
-	mKeccakRound(rpState, rpStack, $0x000000000000808b, MOVQ_RBI_RCE, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBE_RCU, XORQ_RDU_RCU, XORQ_RDA_RCA, XORQ_RDE_RCE)
-	mKeccakRound(rpStack, rpState, $0x0000000080000001, MOVQ_RBI_RCE, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBE_RCU, XORQ_RDU_RCU, XORQ_RDA_RCA, XORQ_RDE_RCE)
-	mKeccakRound(rpState, rpStack, $0x8000000080008081, MOVQ_RBI_RCE, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBE_RCU, XORQ_RDU_RCU, XORQ_RDA_RCA, XORQ_RDE_RCE)
-	mKeccakRound(rpStack, rpState, $0x8000000000008009, MOVQ_RBI_RCE, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBE_RCU, XORQ_RDU_RCU, XORQ_RDA_RCA, XORQ_RDE_RCE)
-	mKeccakRound(rpState, rpStack, $0x000000000000008a, MOVQ_RBI_RCE, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBE_RCU, XORQ_RDU_RCU, XORQ_RDA_RCA, XORQ_RDE_RCE)
-	mKeccakRound(rpStack, rpState, $0x0000000000000088, MOVQ_RBI_RCE, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBE_RCU, XORQ_RDU_RCU, XORQ_RDA_RCA, XORQ_RDE_RCE)
-	mKeccakRound(rpState, rpStack, $0x0000000080008009, MOVQ_RBI_RCE, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBE_RCU, XORQ_RDU_RCU, XORQ_RDA_RCA, XORQ_RDE_RCE)
-	mKeccakRound(rpStack, rpState, $0x000000008000000a, MOVQ_RBI_RCE, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBE_RCU, XORQ_RDU_RCU, XORQ_RDA_RCA, XORQ_RDE_RCE)
-	mKeccakRound(rpState, rpStack, $0x000000008000808b, MOVQ_RBI_RCE, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBE_RCU, XORQ_RDU_RCU, XORQ_RDA_RCA, XORQ_RDE_RCE)
-	mKeccakRound(rpStack, rpState, $0x800000000000008b, MOVQ_RBI_RCE, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBE_RCU, XORQ_RDU_RCU, XORQ_RDA_RCA, XORQ_RDE_RCE)
-	mKeccakRound(rpState, rpStack, $0x8000000000008089, MOVQ_RBI_RCE, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBE_RCU, XORQ_RDU_RCU, XORQ_RDA_RCA, XORQ_RDE_RCE)
-	mKeccakRound(rpStack, rpState, $0x8000000000008003, MOVQ_RBI_RCE, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBE_RCU, XORQ_RDU_RCU, XORQ_RDA_RCA, XORQ_RDE_RCE)
-	mKeccakRound(rpState, rpStack, $0x8000000000008002, MOVQ_RBI_RCE, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBE_RCU, XORQ_RDU_RCU, XORQ_RDA_RCA, XORQ_RDE_RCE)
-	mKeccakRound(rpStack, rpState, $0x8000000000000080, MOVQ_RBI_RCE, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBE_RCU, XORQ_RDU_RCU, XORQ_RDA_RCA, XORQ_RDE_RCE)
-	mKeccakRound(rpState, rpStack, $0x000000000000800a, MOVQ_RBI_RCE, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBE_RCU, XORQ_RDU_RCU, XORQ_RDA_RCA, XORQ_RDE_RCE)
-	mKeccakRound(rpStack, rpState, $0x800000008000000a, MOVQ_RBI_RCE, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBE_RCU, XORQ_RDU_RCU, XORQ_RDA_RCA, XORQ_RDE_RCE)
-	mKeccakRound(rpState, rpStack, $0x8000000080008081, MOVQ_RBI_RCE, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBE_RCU, XORQ_RDU_RCU, XORQ_RDA_RCA, XORQ_RDE_RCE)
-	mKeccakRound(rpStack, rpState, $0x8000000000008080, MOVQ_RBI_RCE, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBE_RCU, XORQ_RDU_RCU, XORQ_RDA_RCA, XORQ_RDE_RCE)
-	mKeccakRound(rpState, rpStack, $0x0000000080000001, MOVQ_RBI_RCE, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBA_RCU, XORQ_RT1_RCA, XORQ_RT1_RCE, XORQ_RBE_RCU, XORQ_RDU_RCU, XORQ_RDA_RCA, XORQ_RDE_RCE)
-	mKeccakRound(rpStack, rpState, $0x8000000080008008, NOP, NOP, NOP, NOP, NOP, NOP, NOP, NOP, NOP, NOP, NOP, NOP, NOP)
-
-	// Revert the internal state to the user state
-	NOTQ _be(rpState)
-	NOTQ _bi(rpState)
-	NOTQ _go(rpState)
-	NOTQ _ki(rpState)
-	NOTQ _mi(rpState)
-	NOTQ _sa(rpState)
-
-	RET
diff --git a/src/vendor/golang.org/x/crypto/sha3/register.go b/src/vendor/golang.org/x/crypto/sha3/register.go
deleted file mode 100644
index addfd504..00000000
--- a/src/vendor/golang.org/x/crypto/sha3/register.go
+++ /dev/null
@@ -1,18 +0,0 @@
-// Copyright 2014 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-//go:build go1.4
-
-package sha3
-
-import (
-	"crypto"
-)
-
-func init() {
-	crypto.RegisterHash(crypto.SHA3_224, New224)
-	crypto.RegisterHash(crypto.SHA3_256, New256)
-	crypto.RegisterHash(crypto.SHA3_384, New384)
-	crypto.RegisterHash(crypto.SHA3_512, New512)
-}
diff --git a/src/vendor/golang.org/x/crypto/sha3/sha3.go b/src/vendor/golang.org/x/crypto/sha3/sha3.go
deleted file mode 100644
index afedde5a..00000000
--- a/src/vendor/golang.org/x/crypto/sha3/sha3.go
+++ /dev/null
@@ -1,185 +0,0 @@
-// Copyright 2014 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package sha3
-
-// spongeDirection indicates the direction bytes are flowing through the sponge.
-type spongeDirection int
-
-const (
-	// spongeAbsorbing indicates that the sponge is absorbing input.
-	spongeAbsorbing spongeDirection = iota
-	// spongeSqueezing indicates that the sponge is being squeezed.
-	spongeSqueezing
-)
-
-const (
-	// maxRate is the maximum size of the internal buffer. SHAKE-256
-	// currently needs the largest buffer.
-	maxRate = 168
-)
-
-type state struct {
-	// Generic sponge components.
-	a    [25]uint64 // main state of the hash
-	rate int        // the number of bytes of state to use
-
-	// dsbyte contains the "domain separation" bits and the first bit of
-	// the padding. Sections 6.1 and 6.2 of [1] separate the outputs of the
-	// SHA-3 and SHAKE functions by appending bitstrings to the message.
-	// Using a little-endian bit-ordering convention, these are "01" for SHA-3
-	// and "1111" for SHAKE, or 00000010b and 00001111b, respectively. Then the
-	// padding rule from section 5.1 is applied to pad the message to a multiple
-	// of the rate, which involves adding a "1" bit, zero or more "0" bits, and
-	// a final "1" bit. We merge the first "1" bit from the padding into dsbyte,
-	// giving 00000110b (0x06) and 00011111b (0x1f).
-	// [1] http://csrc.nist.gov/publications/drafts/fips-202/fips_202_draft.pdf
-	//     "Draft FIPS 202: SHA-3 Standard: Permutation-Based Hash and
-	//      Extendable-Output Functions (May 2014)"
-	dsbyte byte
-
-	i, n    int // storage[i:n] is the buffer, i is only used while squeezing
-	storage [maxRate]byte
-
-	// Specific to SHA-3 and SHAKE.
-	outputLen int             // the default output size in bytes
-	state     spongeDirection // whether the sponge is absorbing or squeezing
-}
-
-// BlockSize returns the rate of sponge underlying this hash function.
-func (d *state) BlockSize() int { return d.rate }
-
-// Size returns the output size of the hash function in bytes.
-func (d *state) Size() int { return d.outputLen }
-
-// Reset clears the internal state by zeroing the sponge state and
-// the buffer indexes, and setting Sponge.state to absorbing.
-func (d *state) Reset() {
-	// Zero the permutation's state.
-	for i := range d.a {
-		d.a[i] = 0
-	}
-	d.state = spongeAbsorbing
-	d.i, d.n = 0, 0
-}
-
-func (d *state) clone() *state {
-	ret := *d
-	return &ret
-}
-
-// permute applies the KeccakF-1600 permutation. It handles
-// any input-output buffering.
-func (d *state) permute() {
-	switch d.state {
-	case spongeAbsorbing:
-		// If we're absorbing, we need to xor the input into the state
-		// before applying the permutation.
-		xorIn(d, d.storage[:d.rate])
-		d.n = 0
-		keccakF1600(&d.a)
-	case spongeSqueezing:
-		// If we're squeezing, we need to apply the permutation before
-		// copying more output.
-		keccakF1600(&d.a)
-		d.i = 0
-		copyOut(d, d.storage[:d.rate])
-	}
-}
-
-// pads appends the domain separation bits in dsbyte, applies
-// the multi-bitrate 10..1 padding rule, and permutes the state.
-func (d *state) padAndPermute() {
-	// Pad with this instance's domain-separator bits. We know that there's
-	// at least one byte of space in d.buf because, if it were full,
-	// permute would have been called to empty it. dsbyte also contains the
-	// first one bit for the padding. See the comment in the state struct.
-	d.storage[d.n] = d.dsbyte
-	d.n++
-	for d.n < d.rate {
-		d.storage[d.n] = 0
-		d.n++
-	}
-	// This adds the final one bit for the padding. Because of the way that
-	// bits are numbered from the LSB upwards, the final bit is the MSB of
-	// the last byte.
-	d.storage[d.rate-1] ^= 0x80
-	// Apply the permutation
-	d.permute()
-	d.state = spongeSqueezing
-	d.n = d.rate
-	copyOut(d, d.storage[:d.rate])
-}
-
-// Write absorbs more data into the hash's state. It panics if any
-// output has already been read.
-func (d *state) Write(p []byte) (written int, err error) {
-	if d.state != spongeAbsorbing {
-		panic("sha3: Write after Read")
-	}
-	written = len(p)
-
-	for len(p) > 0 {
-		if d.n == 0 && len(p) >= d.rate {
-			// The fast path; absorb a full "rate" bytes of input and apply the permutation.
-			xorIn(d, p[:d.rate])
-			p = p[d.rate:]
-			keccakF1600(&d.a)
-		} else {
-			// The slow path; buffer the input until we can fill the sponge, and then xor it in.
-			todo := d.rate - d.n
-			if todo > len(p) {
-				todo = len(p)
-			}
-			d.n += copy(d.storage[d.n:], p[:todo])
-			p = p[todo:]
-
-			// If the sponge is full, apply the permutation.
-			if d.n == d.rate {
-				d.permute()
-			}
-		}
-	}
-
-	return
-}
-
-// Read squeezes an arbitrary number of bytes from the sponge.
-func (d *state) Read(out []byte) (n int, err error) {
-	// If we're still absorbing, pad and apply the permutation.
-	if d.state == spongeAbsorbing {
-		d.padAndPermute()
-	}
-
-	n = len(out)
-
-	// Now, do the squeezing.
-	for len(out) > 0 {
-		n := copy(out, d.storage[d.i:d.n])
-		d.i += n
-		out = out[n:]
-
-		// Apply the permutation if we've squeezed the sponge dry.
-		if d.i == d.rate {
-			d.permute()
-		}
-	}
-
-	return
-}
-
-// Sum applies padding to the hash state and then squeezes out the desired
-// number of output bytes. It panics if any output has already been read.
-func (d *state) Sum(in []byte) []byte {
-	if d.state != spongeAbsorbing {
-		panic("sha3: Sum after Read")
-	}
-
-	// Make a copy of the original hash so that caller can keep writing
-	// and summing.
-	dup := d.clone()
-	hash := make([]byte, dup.outputLen, 64) // explicit cap to allow stack allocation
-	dup.Read(hash)
-	return append(in, hash...)
-}
diff --git a/src/vendor/golang.org/x/crypto/sha3/sha3_s390x.go b/src/vendor/golang.org/x/crypto/sha3/sha3_s390x.go
deleted file mode 100644
index 00d8034a..00000000
--- a/src/vendor/golang.org/x/crypto/sha3/sha3_s390x.go
+++ /dev/null
@@ -1,303 +0,0 @@
-// Copyright 2017 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-//go:build gc && !purego
-
-package sha3
-
-// This file contains code for using the 'compute intermediate
-// message digest' (KIMD) and 'compute last message digest' (KLMD)
-// instructions to compute SHA-3 and SHAKE hashes on IBM Z.
-
-import (
-	"hash"
-
-	"golang.org/x/sys/cpu"
-)
-
-// codes represent 7-bit KIMD/KLMD function codes as defined in
-// the Principles of Operation.
-type code uint64
-
-const (
-	// function codes for KIMD/KLMD
-	sha3_224  code = 32
-	sha3_256       = 33
-	sha3_384       = 34
-	sha3_512       = 35
-	shake_128      = 36
-	shake_256      = 37
-	nopad          = 0x100
-)
-
-// kimd is a wrapper for the 'compute intermediate message digest' instruction.
-// src must be a multiple of the rate for the given function code.
-//
-//go:noescape
-func kimd(function code, chain *[200]byte, src []byte)
-
-// klmd is a wrapper for the 'compute last message digest' instruction.
-// src padding is handled by the instruction.
-//
-//go:noescape
-func klmd(function code, chain *[200]byte, dst, src []byte)
-
-type asmState struct {
-	a         [200]byte       // 1600 bit state
-	buf       []byte          // care must be taken to ensure cap(buf) is a multiple of rate
-	rate      int             // equivalent to block size
-	storage   [3072]byte      // underlying storage for buf
-	outputLen int             // output length for full security
-	function  code            // KIMD/KLMD function code
-	state     spongeDirection // whether the sponge is absorbing or squeezing
-}
-
-func newAsmState(function code) *asmState {
-	var s asmState
-	s.function = function
-	switch function {
-	case sha3_224:
-		s.rate = 144
-		s.outputLen = 28
-	case sha3_256:
-		s.rate = 136
-		s.outputLen = 32
-	case sha3_384:
-		s.rate = 104
-		s.outputLen = 48
-	case sha3_512:
-		s.rate = 72
-		s.outputLen = 64
-	case shake_128:
-		s.rate = 168
-		s.outputLen = 32
-	case shake_256:
-		s.rate = 136
-		s.outputLen = 64
-	default:
-		panic("sha3: unrecognized function code")
-	}
-
-	// limit s.buf size to a multiple of s.rate
-	s.resetBuf()
-	return &s
-}
-
-func (s *asmState) clone() *asmState {
-	c := *s
-	c.buf = c.storage[:len(s.buf):cap(s.buf)]
-	return &c
-}
-
-// copyIntoBuf copies b into buf. It will panic if there is not enough space to
-// store all of b.
-func (s *asmState) copyIntoBuf(b []byte) {
-	bufLen := len(s.buf)
-	s.buf = s.buf[:len(s.buf)+len(b)]
-	copy(s.buf[bufLen:], b)
-}
-
-// resetBuf points buf at storage, sets the length to 0 and sets cap to be a
-// multiple of the rate.
-func (s *asmState) resetBuf() {
-	max := (cap(s.storage) / s.rate) * s.rate
-	s.buf = s.storage[:0:max]
-}
-
-// Write (via the embedded io.Writer interface) adds more data to the running hash.
-// It never returns an error.
-func (s *asmState) Write(b []byte) (int, error) {
-	if s.state != spongeAbsorbing {
-		panic("sha3: Write after Read")
-	}
-	length := len(b)
-	for len(b) > 0 {
-		if len(s.buf) == 0 && len(b) >= cap(s.buf) {
-			// Hash the data directly and push any remaining bytes
-			// into the buffer.
-			remainder := len(b) % s.rate
-			kimd(s.function, &s.a, b[:len(b)-remainder])
-			if remainder != 0 {
-				s.copyIntoBuf(b[len(b)-remainder:])
-			}
-			return length, nil
-		}
-
-		if len(s.buf) == cap(s.buf) {
-			// flush the buffer
-			kimd(s.function, &s.a, s.buf)
-			s.buf = s.buf[:0]
-		}
-
-		// copy as much as we can into the buffer
-		n := len(b)
-		if len(b) > cap(s.buf)-len(s.buf) {
-			n = cap(s.buf) - len(s.buf)
-		}
-		s.copyIntoBuf(b[:n])
-		b = b[n:]
-	}
-	return length, nil
-}
-
-// Read squeezes an arbitrary number of bytes from the sponge.
-func (s *asmState) Read(out []byte) (n int, err error) {
-	// The 'compute last message digest' instruction only stores the digest
-	// at the first operand (dst) for SHAKE functions.
-	if s.function != shake_128 && s.function != shake_256 {
-		panic("sha3: can only call Read for SHAKE functions")
-	}
-
-	n = len(out)
-
-	// need to pad if we were absorbing
-	if s.state == spongeAbsorbing {
-		s.state = spongeSqueezing
-
-		// write hash directly into out if possible
-		if len(out)%s.rate == 0 {
-			klmd(s.function, &s.a, out, s.buf) // len(out) may be 0
-			s.buf = s.buf[:0]
-			return
-		}
-
-		// write hash into buffer
-		max := cap(s.buf)
-		if max > len(out) {
-			max = (len(out)/s.rate)*s.rate + s.rate
-		}
-		klmd(s.function, &s.a, s.buf[:max], s.buf)
-		s.buf = s.buf[:max]
-	}
-
-	for len(out) > 0 {
-		// flush the buffer
-		if len(s.buf) != 0 {
-			c := copy(out, s.buf)
-			out = out[c:]
-			s.buf = s.buf[c:]
-			continue
-		}
-
-		// write hash directly into out if possible
-		if len(out)%s.rate == 0 {
-			klmd(s.function|nopad, &s.a, out, nil)
-			return
-		}
-
-		// write hash into buffer
-		s.resetBuf()
-		if cap(s.buf) > len(out) {
-			s.buf = s.buf[:(len(out)/s.rate)*s.rate+s.rate]
-		}
-		klmd(s.function|nopad, &s.a, s.buf, nil)
-	}
-	return
-}
-
-// Sum appends the current hash to b and returns the resulting slice.
-// It does not change the underlying hash state.
-func (s *asmState) Sum(b []byte) []byte {
-	if s.state != spongeAbsorbing {
-		panic("sha3: Sum after Read")
-	}
-
-	// Copy the state to preserve the original.
-	a := s.a
-
-	// Hash the buffer. Note that we don't clear it because we
-	// aren't updating the state.
-	switch s.function {
-	case sha3_224, sha3_256, sha3_384, sha3_512:
-		klmd(s.function, &a, nil, s.buf)
-		return append(b, a[:s.outputLen]...)
-	case shake_128, shake_256:
-		d := make([]byte, s.outputLen, 64)
-		klmd(s.function, &a, d, s.buf)
-		return append(b, d[:s.outputLen]...)
-	default:
-		panic("sha3: unknown function")
-	}
-}
-
-// Reset resets the Hash to its initial state.
-func (s *asmState) Reset() {
-	for i := range s.a {
-		s.a[i] = 0
-	}
-	s.resetBuf()
-	s.state = spongeAbsorbing
-}
-
-// Size returns the number of bytes Sum will return.
-func (s *asmState) Size() int {
-	return s.outputLen
-}
-
-// BlockSize returns the hash's underlying block size.
-// The Write method must be able to accept any amount
-// of data, but it may operate more efficiently if all writes
-// are a multiple of the block size.
-func (s *asmState) BlockSize() int {
-	return s.rate
-}
-
-// Clone returns a copy of the ShakeHash in its current state.
-func (s *asmState) Clone() ShakeHash {
-	return s.clone()
-}
-
-// new224 returns an assembly implementation of SHA3-224 if available,
-// otherwise it returns a generic implementation.
-func new224() hash.Hash {
-	if cpu.S390X.HasSHA3 {
-		return newAsmState(sha3_224)
-	}
-	return new224Generic()
-}
-
-// new256 returns an assembly implementation of SHA3-256 if available,
-// otherwise it returns a generic implementation.
-func new256() hash.Hash {
-	if cpu.S390X.HasSHA3 {
-		return newAsmState(sha3_256)
-	}
-	return new256Generic()
-}
-
-// new384 returns an assembly implementation of SHA3-384 if available,
-// otherwise it returns a generic implementation.
-func new384() hash.Hash {
-	if cpu.S390X.HasSHA3 {
-		return newAsmState(sha3_384)
-	}
-	return new384Generic()
-}
-
-// new512 returns an assembly implementation of SHA3-512 if available,
-// otherwise it returns a generic implementation.
-func new512() hash.Hash {
-	if cpu.S390X.HasSHA3 {
-		return newAsmState(sha3_512)
-	}
-	return new512Generic()
-}
-
-// newShake128 returns an assembly implementation of SHAKE-128 if available,
-// otherwise it returns a generic implementation.
-func newShake128() ShakeHash {
-	if cpu.S390X.HasSHA3 {
-		return newAsmState(shake_128)
-	}
-	return newShake128Generic()
-}
-
-// newShake256 returns an assembly implementation of SHAKE-256 if available,
-// otherwise it returns a generic implementation.
-func newShake256() ShakeHash {
-	if cpu.S390X.HasSHA3 {
-		return newAsmState(shake_256)
-	}
-	return newShake256Generic()
-}
diff --git a/src/vendor/golang.org/x/crypto/sha3/shake.go b/src/vendor/golang.org/x/crypto/sha3/shake.go
deleted file mode 100644
index 1ea9275b..00000000
--- a/src/vendor/golang.org/x/crypto/sha3/shake.go
+++ /dev/null
@@ -1,174 +0,0 @@
-// Copyright 2014 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package sha3
-
-// This file defines the ShakeHash interface, and provides
-// functions for creating SHAKE and cSHAKE instances, as well as utility
-// functions for hashing bytes to arbitrary-length output.
-//
-//
-// SHAKE implementation is based on FIPS PUB 202 [1]
-// cSHAKE implementations is based on NIST SP 800-185 [2]
-//
-// [1] https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.202.pdf
-// [2] https://doi.org/10.6028/NIST.SP.800-185
-
-import (
-	"encoding/binary"
-	"hash"
-	"io"
-)
-
-// ShakeHash defines the interface to hash functions that support
-// arbitrary-length output. When used as a plain [hash.Hash], it
-// produces minimum-length outputs that provide full-strength generic
-// security.
-type ShakeHash interface {
-	hash.Hash
-
-	// Read reads more output from the hash; reading affects the hash's
-	// state. (ShakeHash.Read is thus very different from Hash.Sum)
-	// It never returns an error, but subsequent calls to Write or Sum
-	// will panic.
-	io.Reader
-
-	// Clone returns a copy of the ShakeHash in its current state.
-	Clone() ShakeHash
-}
-
-// cSHAKE specific context
-type cshakeState struct {
-	*state // SHA-3 state context and Read/Write operations
-
-	// initBlock is the cSHAKE specific initialization set of bytes. It is initialized
-	// by newCShake function and stores concatenation of N followed by S, encoded
-	// by the method specified in 3.3 of [1].
-	// It is stored here in order for Reset() to be able to put context into
-	// initial state.
-	initBlock []byte
-}
-
-// Consts for configuring initial SHA-3 state
-const (
-	dsbyteShake  = 0x1f
-	dsbyteCShake = 0x04
-	rate128      = 168
-	rate256      = 136
-)
-
-func bytepad(input []byte, w int) []byte {
-	// leftEncode always returns max 9 bytes
-	buf := make([]byte, 0, 9+len(input)+w)
-	buf = append(buf, leftEncode(uint64(w))...)
-	buf = append(buf, input...)
-	padlen := w - (len(buf) % w)
-	return append(buf, make([]byte, padlen)...)
-}
-
-func leftEncode(value uint64) []byte {
-	var b [9]byte
-	binary.BigEndian.PutUint64(b[1:], value)
-	// Trim all but last leading zero bytes
-	i := byte(1)
-	for i < 8 && b[i] == 0 {
-		i++
-	}
-	// Prepend number of encoded bytes
-	b[i-1] = 9 - i
-	return b[i-1:]
-}
-
-func newCShake(N, S []byte, rate, outputLen int, dsbyte byte) ShakeHash {
-	c := cshakeState{state: &state{rate: rate, outputLen: outputLen, dsbyte: dsbyte}}
-
-	// leftEncode returns max 9 bytes
-	c.initBlock = make([]byte, 0, 9*2+len(N)+len(S))
-	c.initBlock = append(c.initBlock, leftEncode(uint64(len(N)*8))...)
-	c.initBlock = append(c.initBlock, N...)
-	c.initBlock = append(c.initBlock, leftEncode(uint64(len(S)*8))...)
-	c.initBlock = append(c.initBlock, S...)
-	c.Write(bytepad(c.initBlock, c.rate))
-	return &c
-}
-
-// Reset resets the hash to initial state.
-func (c *cshakeState) Reset() {
-	c.state.Reset()
-	c.Write(bytepad(c.initBlock, c.rate))
-}
-
-// Clone returns copy of a cSHAKE context within its current state.
-func (c *cshakeState) Clone() ShakeHash {
-	b := make([]byte, len(c.initBlock))
-	copy(b, c.initBlock)
-	return &cshakeState{state: c.clone(), initBlock: b}
-}
-
-// Clone returns copy of SHAKE context within its current state.
-func (c *state) Clone() ShakeHash {
-	return c.clone()
-}
-
-// NewShake128 creates a new SHAKE128 variable-output-length ShakeHash.
-// Its generic security strength is 128 bits against all attacks if at
-// least 32 bytes of its output are used.
-func NewShake128() ShakeHash {
-	return newShake128()
-}
-
-// NewShake256 creates a new SHAKE256 variable-output-length ShakeHash.
-// Its generic security strength is 256 bits against all attacks if
-// at least 64 bytes of its output are used.
-func NewShake256() ShakeHash {
-	return newShake256()
-}
-
-func newShake128Generic() *state {
-	return &state{rate: rate128, outputLen: 32, dsbyte: dsbyteShake}
-}
-
-func newShake256Generic() *state {
-	return &state{rate: rate256, outputLen: 64, dsbyte: dsbyteShake}
-}
-
-// NewCShake128 creates a new instance of cSHAKE128 variable-output-length ShakeHash,
-// a customizable variant of SHAKE128.
-// N is used to define functions based on cSHAKE, it can be empty when plain cSHAKE is
-// desired. S is a customization byte string used for domain separation - two cSHAKE
-// computations on same input with different S yield unrelated outputs.
-// When N and S are both empty, this is equivalent to NewShake128.
-func NewCShake128(N, S []byte) ShakeHash {
-	if len(N) == 0 && len(S) == 0 {
-		return NewShake128()
-	}
-	return newCShake(N, S, rate128, 32, dsbyteCShake)
-}
-
-// NewCShake256 creates a new instance of cSHAKE256 variable-output-length ShakeHash,
-// a customizable variant of SHAKE256.
-// N is used to define functions based on cSHAKE, it can be empty when plain cSHAKE is
-// desired. S is a customization byte string used for domain separation - two cSHAKE
-// computations on same input with different S yield unrelated outputs.
-// When N and S are both empty, this is equivalent to NewShake256.
-func NewCShake256(N, S []byte) ShakeHash {
-	if len(N) == 0 && len(S) == 0 {
-		return NewShake256()
-	}
-	return newCShake(N, S, rate256, 64, dsbyteCShake)
-}
-
-// ShakeSum128 writes an arbitrary-length digest of data into hash.
-func ShakeSum128(hash, data []byte) {
-	h := NewShake128()
-	h.Write(data)
-	h.Read(hash)
-}
-
-// ShakeSum256 writes an arbitrary-length digest of data into hash.
-func ShakeSum256(hash, data []byte) {
-	h := NewShake256()
-	h.Write(data)
-	h.Read(hash)
-}
diff --git a/src/vendor/golang.org/x/crypto/sha3/shake_noasm.go b/src/vendor/golang.org/x/crypto/sha3/shake_noasm.go
deleted file mode 100644
index 4276ba4a..00000000
--- a/src/vendor/golang.org/x/crypto/sha3/shake_noasm.go
+++ /dev/null
@@ -1,15 +0,0 @@
-// Copyright 2023 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-//go:build !gc || purego || !s390x
-
-package sha3
-
-func newShake128() *state {
-	return newShake128Generic()
-}
-
-func newShake256() *state {
-	return newShake256Generic()
-}
diff --git a/src/vendor/golang.org/x/crypto/sha3/xor.go b/src/vendor/golang.org/x/crypto/sha3/xor.go
deleted file mode 100644
index 6ada5c95..00000000
--- a/src/vendor/golang.org/x/crypto/sha3/xor.go
+++ /dev/null
@@ -1,40 +0,0 @@
-// Copyright 2015 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package sha3
-
-import (
-	"crypto/subtle"
-	"encoding/binary"
-	"unsafe"
-
-	"golang.org/x/sys/cpu"
-)
-
-// xorIn xors the bytes in buf into the state.
-func xorIn(d *state, buf []byte) {
-	if cpu.IsBigEndian {
-		for i := 0; len(buf) >= 8; i++ {
-			a := binary.LittleEndian.Uint64(buf)
-			d.a[i] ^= a
-			buf = buf[8:]
-		}
-	} else {
-		ab := (*[25 * 64 / 8]byte)(unsafe.Pointer(&d.a))
-		subtle.XORBytes(ab[:], ab[:], buf)
-	}
-}
-
-// copyOut copies uint64s to a byte buffer.
-func copyOut(d *state, b []byte) {
-	if cpu.IsBigEndian {
-		for i := 0; len(b) >= 8; i++ {
-			binary.LittleEndian.PutUint64(b, d.a[i])
-			b = b[8:]
-		}
-	} else {
-		ab := (*[25 * 64 / 8]byte)(unsafe.Pointer(&d.a))
-		copy(b, ab[:])
-	}
-}
diff --git a/src/vendor/golang.org/x/net/LICENSE b/src/vendor/golang.org/x/net/LICENSE
index 6a66aea5..2a7cf70d 100644
--- a/src/vendor/golang.org/x/net/LICENSE
+++ b/src/vendor/golang.org/x/net/LICENSE
@@ -1,4 +1,4 @@
-Copyright (c) 2009 The Go Authors. All rights reserved.
+Copyright 2009 The Go Authors.
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are
@@ -10,7 +10,7 @@ notice, this list of conditions and the following disclaimer.
 copyright notice, this list of conditions and the following disclaimer
 in the documentation and/or other materials provided with the
 distribution.
-   * Neither the name of Google Inc. nor the names of its
+   * Neither the name of Google LLC nor the names of its
 contributors may be used to endorse or promote products derived from
 this software without specific prior written permission.
 
diff --git a/src/vendor/golang.org/x/net/route/address.go b/src/vendor/golang.org/x/net/route/address.go
index 5443d672..b649f431 100644
--- a/src/vendor/golang.org/x/net/route/address.go
+++ b/src/vendor/golang.org/x/net/route/address.go
@@ -170,20 +170,37 @@ func (a *Inet6Addr) marshal(b []byte) (int, error) {
 
 // parseInetAddr parses b as an internet address for IPv4 or IPv6.
 func parseInetAddr(af int, b []byte) (Addr, error) {
+	const (
+		off4 = 4 // offset of in_addr
+		off6 = 8 // offset of in6_addr
+	)
 	switch af {
 	case syscall.AF_INET:
-		if len(b) < sizeofSockaddrInet {
+		if len(b) < (off4+1) || len(b) < int(b[0]) || b[0] == 0 {
 			return nil, errInvalidAddr
 		}
+		sockAddrLen := int(b[0])
 		a := &Inet4Addr{}
-		copy(a.IP[:], b[4:8])
+		n := off4 + 4
+		if sockAddrLen < n {
+			n = sockAddrLen
+		}
+		copy(a.IP[:], b[off4:n])
 		return a, nil
 	case syscall.AF_INET6:
-		if len(b) < sizeofSockaddrInet6 {
+		if len(b) < (off6+1) || len(b) < int(b[0]) || b[0] == 0 {
 			return nil, errInvalidAddr
 		}
-		a := &Inet6Addr{ZoneID: int(nativeEndian.Uint32(b[24:28]))}
-		copy(a.IP[:], b[8:24])
+		sockAddrLen := int(b[0])
+		n := off6 + 16
+		if sockAddrLen < n {
+			n = sockAddrLen
+		}
+		a := &Inet6Addr{}
+		if sockAddrLen == sizeofSockaddrInet6 {
+			a.ZoneID = int(nativeEndian.Uint32(b[24:28]))
+		}
+		copy(a.IP[:], b[off6:n])
 		if a.IP[0] == 0xfe && a.IP[1]&0xc0 == 0x80 || a.IP[0] == 0xff && (a.IP[1]&0x0f == 0x01 || a.IP[1]&0x0f == 0x02) {
 			// KAME based IPv6 protocol stack usually
 			// embeds the interface index in the
@@ -387,12 +404,16 @@ func parseAddrs(attrs uint, fn func(int, []byte) (int, Addr, error), b []byte) (
 				}
 				b = b[l:]
 			case syscall.AF_INET, syscall.AF_INET6:
-				af = int(b[1])
-				a, err := parseInetAddr(af, b)
-				if err != nil {
-					return nil, err
+				// #70528: if the sockaddrlen is 0, no address to parse inside,
+				// skip over the record.
+				if b[0] > 0 {
+					af = int(b[1])
+					a, err := parseInetAddr(af, b)
+					if err != nil {
+						return nil, err
+					}
+					as[i] = a
 				}
-				as[i] = a
 				l := roundup(int(b[0]))
 				if len(b) < l {
 					return nil, errMessageTooShort
diff --git a/src/vendor/golang.org/x/sys/LICENSE b/src/vendor/golang.org/x/sys/LICENSE
index 6a66aea5..2a7cf70d 100644
--- a/src/vendor/golang.org/x/sys/LICENSE
+++ b/src/vendor/golang.org/x/sys/LICENSE
@@ -1,4 +1,4 @@
-Copyright (c) 2009 The Go Authors. All rights reserved.
+Copyright 2009 The Go Authors.
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are
@@ -10,7 +10,7 @@ notice, this list of conditions and the following disclaimer.
 copyright notice, this list of conditions and the following disclaimer
 in the documentation and/or other materials provided with the
 distribution.
-   * Neither the name of Google Inc. nor the names of its
+   * Neither the name of Google LLC nor the names of its
 contributors may be used to endorse or promote products derived from
 this software without specific prior written permission.
 
diff --git a/src/vendor/golang.org/x/sys/cpu/asm_darwin_x86_gc.s b/src/vendor/golang.org/x/sys/cpu/asm_darwin_x86_gc.s
new file mode 100644
index 00000000..ec2acfe5
--- /dev/null
+++ b/src/vendor/golang.org/x/sys/cpu/asm_darwin_x86_gc.s
@@ -0,0 +1,17 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build darwin && amd64 && gc
+
+#include "textflag.h"
+
+TEXT libc_sysctl_trampoline<>(SB),NOSPLIT,$0-0
+	JMP	libc_sysctl(SB)
+GLOBL	·libc_sysctl_trampoline_addr(SB), RODATA, $8
+DATA	·libc_sysctl_trampoline_addr(SB)/8, $libc_sysctl_trampoline<>(SB)
+
+TEXT libc_sysctlbyname_trampoline<>(SB),NOSPLIT,$0-0
+	JMP	libc_sysctlbyname(SB)
+GLOBL	·libc_sysctlbyname_trampoline_addr(SB), RODATA, $8
+DATA	·libc_sysctlbyname_trampoline_addr(SB)/8, $libc_sysctlbyname_trampoline<>(SB)
diff --git a/src/vendor/golang.org/x/sys/cpu/cpu.go b/src/vendor/golang.org/x/sys/cpu/cpu.go
index 8fa707aa..02609d5b 100644
--- a/src/vendor/golang.org/x/sys/cpu/cpu.go
+++ b/src/vendor/golang.org/x/sys/cpu/cpu.go
@@ -105,6 +105,8 @@ var ARM64 struct {
 	HasSVE      bool // Scalable Vector Extensions
 	HasSVE2     bool // Scalable Vector Extensions 2
 	HasASIMDFHM bool // Advanced SIMD multiplication FP16 to FP32
+	HasDIT      bool // Data Independent Timing support
+	HasI8MM     bool // Advanced SIMD Int8 matrix multiplication instructions
 	_           CacheLinePad
 }
 
@@ -199,6 +201,25 @@ var S390X struct {
 	_         CacheLinePad
 }
 
+// RISCV64 contains the supported CPU features and performance characteristics for riscv64
+// platforms. The booleans in RISCV64, with the exception of HasFastMisaligned, indicate
+// the presence of RISC-V extensions.
+//
+// It is safe to assume that all the RV64G extensions are supported and so they are omitted from
+// this structure. As riscv64 Go programs require at least RV64G, the code that populates
+// this structure cannot run successfully if some of the RV64G extensions are missing.
+// The struct is padded to avoid false sharing.
+var RISCV64 struct {
+	_                 CacheLinePad
+	HasFastMisaligned bool // Fast misaligned accesses
+	HasC              bool // Compressed instruction-set extension
+	HasV              bool // Vector extension compatible with RVV 1.0
+	HasZba            bool // Address generation instructions extension
+	HasZbb            bool // Basic bit-manipulation extension
+	HasZbs            bool // Single-bit instructions extension
+	_                 CacheLinePad
+}
+
 func init() {
 	archInit()
 	initOptions()
diff --git a/src/vendor/golang.org/x/sys/cpu/cpu_arm64.go b/src/vendor/golang.org/x/sys/cpu/cpu_arm64.go
index 0e27a21e..af2aa99f 100644
--- a/src/vendor/golang.org/x/sys/cpu/cpu_arm64.go
+++ b/src/vendor/golang.org/x/sys/cpu/cpu_arm64.go
@@ -38,6 +38,8 @@ func initOptions() {
 		{Name: "dcpop", Feature: &ARM64.HasDCPOP},
 		{Name: "asimddp", Feature: &ARM64.HasASIMDDP},
 		{Name: "asimdfhm", Feature: &ARM64.HasASIMDFHM},
+		{Name: "dit", Feature: &ARM64.HasDIT},
+		{Name: "i8mm", Feature: &ARM64.HasI8MM},
 	}
 }
 
@@ -145,6 +147,11 @@ func parseARM64SystemRegisters(isar0, isar1, pfr0 uint64) {
 		ARM64.HasLRCPC = true
 	}
 
+	switch extractBits(isar1, 52, 55) {
+	case 1:
+		ARM64.HasI8MM = true
+	}
+
 	// ID_AA64PFR0_EL1
 	switch extractBits(pfr0, 16, 19) {
 	case 0:
@@ -168,6 +175,11 @@ func parseARM64SystemRegisters(isar0, isar1, pfr0 uint64) {
 
 		parseARM64SVERegister(getzfr0())
 	}
+
+	switch extractBits(pfr0, 48, 51) {
+	case 1:
+		ARM64.HasDIT = true
+	}
 }
 
 func parseARM64SVERegister(zfr0 uint64) {
diff --git a/src/vendor/golang.org/x/sys/cpu/cpu_darwin_x86.go b/src/vendor/golang.org/x/sys/cpu/cpu_darwin_x86.go
new file mode 100644
index 00000000..b838cb9e
--- /dev/null
+++ b/src/vendor/golang.org/x/sys/cpu/cpu_darwin_x86.go
@@ -0,0 +1,61 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build darwin && amd64 && gc
+
+package cpu
+
+// darwinSupportsAVX512 checks Darwin kernel for AVX512 support via sysctl
+// call (see issue 43089). It also restricts AVX512 support for Darwin to
+// kernel version 21.3.0 (MacOS 12.2.0) or later (see issue 49233).
+//
+// Background:
+// Darwin implements a special mechanism to economize on thread state when
+// AVX512 specific registers are not in use. This scheme minimizes state when
+// preempting threads that haven't yet used any AVX512 instructions, but adds
+// special requirements to check for AVX512 hardware support at runtime (e.g.
+// via sysctl call or commpage inspection). See issue 43089 and link below for
+// full background:
+// https://github.com/apple-oss-distributions/xnu/blob/xnu-11215.1.10/osfmk/i386/fpu.c#L214-L240
+//
+// Additionally, all versions of the Darwin kernel from 19.6.0 through 21.2.0
+// (corresponding to MacOS 10.15.6 - 12.1) have a bug that can cause corruption
+// of the AVX512 mask registers (K0-K7) upon signal return. For this reason
+// AVX512 is considered unsafe to use on Darwin for kernel versions prior to
+// 21.3.0, where a fix has been confirmed. See issue 49233 for full background.
+func darwinSupportsAVX512() bool {
+	return darwinSysctlEnabled([]byte("hw.optional.avx512f\x00")) && darwinKernelVersionCheck(21, 3, 0)
+}
+
+// Ensure Darwin kernel version is at least major.minor.patch, avoiding dependencies
+func darwinKernelVersionCheck(major, minor, patch int) bool {
+	var release [256]byte
+	err := darwinOSRelease(&release)
+	if err != nil {
+		return false
+	}
+
+	var mmp [3]int
+	c := 0
+Loop:
+	for _, b := range release[:] {
+		switch {
+		case b >= '0' && b <= '9':
+			mmp[c] = 10*mmp[c] + int(b-'0')
+		case b == '.':
+			c++
+			if c > 2 {
+				return false
+			}
+		case b == 0:
+			break Loop
+		default:
+			return false
+		}
+	}
+	if c != 2 {
+		return false
+	}
+	return mmp[0] > major || mmp[0] == major && (mmp[1] > minor || mmp[1] == minor && mmp[2] >= patch)
+}
diff --git a/src/vendor/golang.org/x/sys/cpu/cpu_gc_x86.go b/src/vendor/golang.org/x/sys/cpu/cpu_gc_x86.go
index 910728fb..32a44514 100644
--- a/src/vendor/golang.org/x/sys/cpu/cpu_gc_x86.go
+++ b/src/vendor/golang.org/x/sys/cpu/cpu_gc_x86.go
@@ -6,10 +6,10 @@
 
 package cpu
 
-// cpuid is implemented in cpu_x86.s for gc compiler
+// cpuid is implemented in cpu_gc_x86.s for gc compiler
 // and in cpu_gccgo.c for gccgo.
 func cpuid(eaxArg, ecxArg uint32) (eax, ebx, ecx, edx uint32)
 
-// xgetbv with ecx = 0 is implemented in cpu_x86.s for gc compiler
+// xgetbv with ecx = 0 is implemented in cpu_gc_x86.s for gc compiler
 // and in cpu_gccgo.c for gccgo.
 func xgetbv() (eax, edx uint32)
diff --git a/src/vendor/golang.org/x/sys/cpu/cpu_x86.s b/src/vendor/golang.org/x/sys/cpu/cpu_gc_x86.s
similarity index 94%
rename from src/vendor/golang.org/x/sys/cpu/cpu_x86.s
rename to src/vendor/golang.org/x/sys/cpu/cpu_gc_x86.s
index 7d7ba33e..ce208ce6 100644
--- a/src/vendor/golang.org/x/sys/cpu/cpu_x86.s
+++ b/src/vendor/golang.org/x/sys/cpu/cpu_gc_x86.s
@@ -18,7 +18,7 @@ TEXT ·cpuid(SB), NOSPLIT, $0-24
 	RET
 
 // func xgetbv() (eax, edx uint32)
-TEXT ·xgetbv(SB),NOSPLIT,$0-8
+TEXT ·xgetbv(SB), NOSPLIT, $0-8
 	MOVL $0, CX
 	XGETBV
 	MOVL AX, eax+0(FP)
diff --git a/src/vendor/golang.org/x/sys/cpu/cpu_gccgo_x86.go b/src/vendor/golang.org/x/sys/cpu/cpu_gccgo_x86.go
index 99c60fe9..170d21dd 100644
--- a/src/vendor/golang.org/x/sys/cpu/cpu_gccgo_x86.go
+++ b/src/vendor/golang.org/x/sys/cpu/cpu_gccgo_x86.go
@@ -23,9 +23,3 @@ func xgetbv() (eax, edx uint32) {
 	gccgoXgetbv(&a, &d)
 	return a, d
 }
-
-// gccgo doesn't build on Darwin, per:
-// https://github.com/Homebrew/homebrew-core/blob/HEAD/Formula/gcc.rb#L76
-func darwinSupportsAVX512() bool {
-	return false
-}
diff --git a/src/vendor/golang.org/x/sys/cpu/cpu_linux_arm64.go b/src/vendor/golang.org/x/sys/cpu/cpu_linux_arm64.go
index 3d386d0f..f1caf0f7 100644
--- a/src/vendor/golang.org/x/sys/cpu/cpu_linux_arm64.go
+++ b/src/vendor/golang.org/x/sys/cpu/cpu_linux_arm64.go
@@ -35,8 +35,10 @@ const (
 	hwcap_SHA512   = 1 << 21
 	hwcap_SVE      = 1 << 22
 	hwcap_ASIMDFHM = 1 << 23
+	hwcap_DIT      = 1 << 24
 
 	hwcap2_SVE2 = 1 << 1
+	hwcap2_I8MM = 1 << 13
 )
 
 // linuxKernelCanEmulateCPUID reports whether we're running
@@ -106,9 +108,11 @@ func doinit() {
 	ARM64.HasSHA512 = isSet(hwCap, hwcap_SHA512)
 	ARM64.HasSVE = isSet(hwCap, hwcap_SVE)
 	ARM64.HasASIMDFHM = isSet(hwCap, hwcap_ASIMDFHM)
+	ARM64.HasDIT = isSet(hwCap, hwcap_DIT)
 
 	// HWCAP2 feature bits
 	ARM64.HasSVE2 = isSet(hwCap2, hwcap2_SVE2)
+	ARM64.HasI8MM = isSet(hwCap2, hwcap2_I8MM)
 }
 
 func isSet(hwc uint, value uint) bool {
diff --git a/src/vendor/golang.org/x/sys/cpu/cpu_linux_noinit.go b/src/vendor/golang.org/x/sys/cpu/cpu_linux_noinit.go
index cd63e733..7d902b68 100644
--- a/src/vendor/golang.org/x/sys/cpu/cpu_linux_noinit.go
+++ b/src/vendor/golang.org/x/sys/cpu/cpu_linux_noinit.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build linux && !arm && !arm64 && !mips64 && !mips64le && !ppc64 && !ppc64le && !s390x
+//go:build linux && !arm && !arm64 && !mips64 && !mips64le && !ppc64 && !ppc64le && !s390x && !riscv64
 
 package cpu
 
diff --git a/src/vendor/golang.org/x/sys/cpu/cpu_linux_riscv64.go b/src/vendor/golang.org/x/sys/cpu/cpu_linux_riscv64.go
new file mode 100644
index 00000000..cb4a0c57
--- /dev/null
+++ b/src/vendor/golang.org/x/sys/cpu/cpu_linux_riscv64.go
@@ -0,0 +1,137 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package cpu
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+// RISC-V extension discovery code for Linux. The approach here is to first try the riscv_hwprobe
+// syscall falling back to HWCAP to check for the C extension if riscv_hwprobe is not available.
+//
+// A note on detection of the Vector extension using HWCAP.
+//
+// Support for the Vector extension version 1.0 was added to the Linux kernel in release 6.5.
+// Support for the riscv_hwprobe syscall was added in 6.4. It follows that if the riscv_hwprobe
+// syscall is not available then neither is the Vector extension (which needs kernel support).
+// The riscv_hwprobe syscall should then be all we need to detect the Vector extension.
+// However, some RISC-V board manufacturers ship boards with an older kernel on top of which
+// they have back-ported various versions of the Vector extension patches but not the riscv_hwprobe
+// patches. These kernels advertise support for the Vector extension using HWCAP. Falling
+// back to HWCAP to detect the Vector extension, if riscv_hwprobe is not available, or simply not
+// bothering with riscv_hwprobe at all and just using HWCAP may then seem like an attractive option.
+//
+// Unfortunately, simply checking the 'V' bit in AT_HWCAP will not work as this bit is used by
+// RISC-V board and cloud instance providers to mean different things. The Lichee Pi 4A board
+// and the Scaleway RV1 cloud instances use the 'V' bit to advertise their support for the unratified
+// 0.7.1 version of the Vector Specification. The Banana Pi BPI-F3 and the CanMV-K230 board use
+// it to advertise support for 1.0 of the Vector extension. Versions 0.7.1 and 1.0 of the Vector
+// extension are binary incompatible. HWCAP can then not be used in isolation to populate the
+// HasV field as this field indicates that the underlying CPU is compatible with RVV 1.0.
+//
+// There is a way at runtime to distinguish between versions 0.7.1 and 1.0 of the Vector
+// specification by issuing a RVV 1.0 vsetvli instruction and checking the vill bit of the vtype
+// register. This check would allow us to safely detect version 1.0 of the Vector extension
+// with HWCAP, if riscv_hwprobe were not available. However, the check cannot
+// be added until the assembler supports the Vector instructions.
+//
+// Note the riscv_hwprobe syscall does not suffer from these ambiguities by design as all of the
+// extensions it advertises support for are explicitly versioned. It's also worth noting that
+// the riscv_hwprobe syscall is the only way to detect multi-letter RISC-V extensions, e.g., Zba.
+// These cannot be detected using HWCAP and so riscv_hwprobe must be used to detect the majority
+// of RISC-V extensions.
+//
+// Please see https://docs.kernel.org/arch/riscv/hwprobe.html for more information.
+
+// golang.org/x/sys/cpu is not allowed to depend on golang.org/x/sys/unix so we must
+// reproduce the constants, types and functions needed to make the riscv_hwprobe syscall
+// here.
+
+const (
+	// Copied from golang.org/x/sys/unix/ztypes_linux_riscv64.go.
+	riscv_HWPROBE_KEY_IMA_EXT_0   = 0x4
+	riscv_HWPROBE_IMA_C           = 0x2
+	riscv_HWPROBE_IMA_V           = 0x4
+	riscv_HWPROBE_EXT_ZBA         = 0x8
+	riscv_HWPROBE_EXT_ZBB         = 0x10
+	riscv_HWPROBE_EXT_ZBS         = 0x20
+	riscv_HWPROBE_KEY_CPUPERF_0   = 0x5
+	riscv_HWPROBE_MISALIGNED_FAST = 0x3
+	riscv_HWPROBE_MISALIGNED_MASK = 0x7
+)
+
+const (
+	// sys_RISCV_HWPROBE is copied from golang.org/x/sys/unix/zsysnum_linux_riscv64.go.
+	sys_RISCV_HWPROBE = 258
+)
+
+// riscvHWProbePairs is copied from golang.org/x/sys/unix/ztypes_linux_riscv64.go.
+type riscvHWProbePairs struct {
+	key   int64
+	value uint64
+}
+
+const (
+	// CPU features
+	hwcap_RISCV_ISA_C = 1 << ('C' - 'A')
+)
+
+func doinit() {
+	// A slice of key/value pair structures is passed to the RISCVHWProbe syscall. The key
+	// field should be initialised with one of the key constants defined above, e.g.,
+	// RISCV_HWPROBE_KEY_IMA_EXT_0. The syscall will set the value field to the appropriate value.
+	// If the kernel does not recognise a key it will set the key field to -1 and the value field to 0.
+
+	pairs := []riscvHWProbePairs{
+		{riscv_HWPROBE_KEY_IMA_EXT_0, 0},
+		{riscv_HWPROBE_KEY_CPUPERF_0, 0},
+	}
+
+	// This call only indicates that extensions are supported if they are implemented on all cores.
+	if riscvHWProbe(pairs, 0) {
+		if pairs[0].key != -1 {
+			v := uint(pairs[0].value)
+			RISCV64.HasC = isSet(v, riscv_HWPROBE_IMA_C)
+			RISCV64.HasV = isSet(v, riscv_HWPROBE_IMA_V)
+			RISCV64.HasZba = isSet(v, riscv_HWPROBE_EXT_ZBA)
+			RISCV64.HasZbb = isSet(v, riscv_HWPROBE_EXT_ZBB)
+			RISCV64.HasZbs = isSet(v, riscv_HWPROBE_EXT_ZBS)
+		}
+		if pairs[1].key != -1 {
+			v := pairs[1].value & riscv_HWPROBE_MISALIGNED_MASK
+			RISCV64.HasFastMisaligned = v == riscv_HWPROBE_MISALIGNED_FAST
+		}
+	}
+
+	// Let's double check with HWCAP if the C extension does not appear to be supported.
+	// This may happen if we're running on a kernel older than 6.4.
+
+	if !RISCV64.HasC {
+		RISCV64.HasC = isSet(hwCap, hwcap_RISCV_ISA_C)
+	}
+}
+
+func isSet(hwc uint, value uint) bool {
+	return hwc&value != 0
+}
+
+// riscvHWProbe is a simplified version of the generated wrapper function found in
+// golang.org/x/sys/unix/zsyscall_linux_riscv64.go. We simplify it by removing the
+// cpuCount and cpus parameters which we do not need. We always want to pass 0 for
+// these parameters here so the kernel only reports the extensions that are present
+// on all cores.
+func riscvHWProbe(pairs []riscvHWProbePairs, flags uint) bool {
+	var _zero uintptr
+	var p0 unsafe.Pointer
+	if len(pairs) > 0 {
+		p0 = unsafe.Pointer(&pairs[0])
+	} else {
+		p0 = unsafe.Pointer(&_zero)
+	}
+
+	_, _, e1 := syscall.Syscall6(sys_RISCV_HWPROBE, uintptr(p0), uintptr(len(pairs)), uintptr(0), uintptr(0), uintptr(flags), 0)
+	return e1 == 0
+}
diff --git a/src/vendor/golang.org/x/sys/cpu/cpu_other_x86.go b/src/vendor/golang.org/x/sys/cpu/cpu_other_x86.go
new file mode 100644
index 00000000..a0fd7e2f
--- /dev/null
+++ b/src/vendor/golang.org/x/sys/cpu/cpu_other_x86.go
@@ -0,0 +1,11 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build 386 || amd64p32 || (amd64 && (!darwin || !gc))
+
+package cpu
+
+func darwinSupportsAVX512() bool {
+	panic("only implemented for gc && amd64 && darwin")
+}
diff --git a/src/vendor/golang.org/x/sys/cpu/cpu_riscv64.go b/src/vendor/golang.org/x/sys/cpu/cpu_riscv64.go
index 7f0c79c0..aca3199c 100644
--- a/src/vendor/golang.org/x/sys/cpu/cpu_riscv64.go
+++ b/src/vendor/golang.org/x/sys/cpu/cpu_riscv64.go
@@ -8,4 +8,13 @@ package cpu
 
 const cacheLineSize = 64
 
-func initOptions() {}
+func initOptions() {
+	options = []option{
+		{Name: "fastmisaligned", Feature: &RISCV64.HasFastMisaligned},
+		{Name: "c", Feature: &RISCV64.HasC},
+		{Name: "v", Feature: &RISCV64.HasV},
+		{Name: "zba", Feature: &RISCV64.HasZba},
+		{Name: "zbb", Feature: &RISCV64.HasZbb},
+		{Name: "zbs", Feature: &RISCV64.HasZbs},
+	}
+}
diff --git a/src/vendor/golang.org/x/sys/cpu/cpu_x86.go b/src/vendor/golang.org/x/sys/cpu/cpu_x86.go
index c29f5e4c..600a6807 100644
--- a/src/vendor/golang.org/x/sys/cpu/cpu_x86.go
+++ b/src/vendor/golang.org/x/sys/cpu/cpu_x86.go
@@ -92,10 +92,8 @@ func archInit() {
 		osSupportsAVX = isSet(1, eax) && isSet(2, eax)
 
 		if runtime.GOOS == "darwin" {
-			// Darwin doesn't save/restore AVX-512 mask registers correctly across signal handlers.
-			// Since users can't rely on mask register contents, let's not advertise AVX-512 support.
-			// See issue 49233.
-			osSupportsAVX512 = false
+			// Darwin requires special AVX512 checks, see cpu_darwin_x86.go
+			osSupportsAVX512 = osSupportsAVX && darwinSupportsAVX512()
 		} else {
 			// Check if OPMASK and ZMM registers have OS support.
 			osSupportsAVX512 = osSupportsAVX && isSet(5, eax) && isSet(6, eax) && isSet(7, eax)
diff --git a/src/vendor/golang.org/x/sys/cpu/syscall_darwin_x86_gc.go b/src/vendor/golang.org/x/sys/cpu/syscall_darwin_x86_gc.go
new file mode 100644
index 00000000..4d0888b0
--- /dev/null
+++ b/src/vendor/golang.org/x/sys/cpu/syscall_darwin_x86_gc.go
@@ -0,0 +1,98 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Minimal copy of x/sys/unix so the cpu package can make a
+// system call on Darwin without depending on x/sys/unix.
+
+//go:build darwin && amd64 && gc
+
+package cpu
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+type _C_int int32
+
+// adapted from unix.Uname() at x/sys/unix/syscall_darwin.go L419
+func darwinOSRelease(release *[256]byte) error {
+	// from x/sys/unix/zerrors_openbsd_amd64.go
+	const (
+		CTL_KERN       = 0x1
+		KERN_OSRELEASE = 0x2
+	)
+
+	mib := []_C_int{CTL_KERN, KERN_OSRELEASE}
+	n := unsafe.Sizeof(*release)
+
+	return sysctl(mib, &release[0], &n, nil, 0)
+}
+
+type Errno = syscall.Errno
+
+var _zero uintptr // Single-word zero for use when we need a valid pointer to 0 bytes.
+
+// from x/sys/unix/zsyscall_darwin_amd64.go L791-807
+func sysctl(mib []_C_int, old *byte, oldlen *uintptr, new *byte, newlen uintptr) error {
+	var _p0 unsafe.Pointer
+	if len(mib) > 0 {
+		_p0 = unsafe.Pointer(&mib[0])
+	} else {
+		_p0 = unsafe.Pointer(&_zero)
+	}
+	if _, _, err := syscall_syscall6(
+		libc_sysctl_trampoline_addr,
+		uintptr(_p0),
+		uintptr(len(mib)),
+		uintptr(unsafe.Pointer(old)),
+		uintptr(unsafe.Pointer(oldlen)),
+		uintptr(unsafe.Pointer(new)),
+		uintptr(newlen),
+	); err != 0 {
+		return err
+	}
+
+	return nil
+}
+
+var libc_sysctl_trampoline_addr uintptr
+
+// adapted from internal/cpu/cpu_arm64_darwin.go
+func darwinSysctlEnabled(name []byte) bool {
+	out := int32(0)
+	nout := unsafe.Sizeof(out)
+	if ret := sysctlbyname(&name[0], (*byte)(unsafe.Pointer(&out)), &nout, nil, 0); ret != nil {
+		return false
+	}
+	return out > 0
+}
+
+//go:cgo_import_dynamic libc_sysctl sysctl "/usr/lib/libSystem.B.dylib"
+
+var libc_sysctlbyname_trampoline_addr uintptr
+
+// adapted from runtime/sys_darwin.go in the pattern of sysctl() above, as defined in x/sys/unix
+func sysctlbyname(name *byte, old *byte, oldlen *uintptr, new *byte, newlen uintptr) error {
+	if _, _, err := syscall_syscall6(
+		libc_sysctlbyname_trampoline_addr,
+		uintptr(unsafe.Pointer(name)),
+		uintptr(unsafe.Pointer(old)),
+		uintptr(unsafe.Pointer(oldlen)),
+		uintptr(unsafe.Pointer(new)),
+		uintptr(newlen),
+		0,
+	); err != 0 {
+		return err
+	}
+
+	return nil
+}
+
+//go:cgo_import_dynamic libc_sysctlbyname sysctlbyname "/usr/lib/libSystem.B.dylib"
+
+// Implemented in the runtime package (runtime/sys_darwin.go)
+func syscall_syscall6(fn, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno)
+
+//go:linkname syscall_syscall6 syscall.syscall6
diff --git a/src/vendor/golang.org/x/text/LICENSE b/src/vendor/golang.org/x/text/LICENSE
index 6a66aea5..2a7cf70d 100644
--- a/src/vendor/golang.org/x/text/LICENSE
+++ b/src/vendor/golang.org/x/text/LICENSE
@@ -1,4 +1,4 @@
-Copyright (c) 2009 The Go Authors. All rights reserved.
+Copyright 2009 The Go Authors.
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are
@@ -10,7 +10,7 @@ notice, this list of conditions and the following disclaimer.
 copyright notice, this list of conditions and the following disclaimer
 in the documentation and/or other materials provided with the
 distribution.
-   * Neither the name of Google Inc. nor the names of its
+   * Neither the name of Google LLC nor the names of its
 contributors may be used to endorse or promote products derived from
 this software without specific prior written permission.
 
diff --git a/src/vendor/modules.txt b/src/vendor/modules.txt
index b8a0b84a..d42f50b4 100644
--- a/src/vendor/modules.txt
+++ b/src/vendor/modules.txt
@@ -1,14 +1,12 @@
-# golang.org/x/crypto v0.23.1-0.20240603234054-0b431c7de36a
-## explicit; go 1.18
+# golang.org/x/crypto v0.30.0
+## explicit; go 1.20
 golang.org/x/crypto/chacha20
 golang.org/x/crypto/chacha20poly1305
 golang.org/x/crypto/cryptobyte
 golang.org/x/crypto/cryptobyte/asn1
-golang.org/x/crypto/hkdf
 golang.org/x/crypto/internal/alias
 golang.org/x/crypto/internal/poly1305
-golang.org/x/crypto/sha3
-# golang.org/x/net v0.25.1-0.20240603202750-6249541f2a6c
+# golang.org/x/net v0.32.1-0.20250121202134-9a960c88dd98
 ## explicit; go 1.18
 golang.org/x/net/dns/dnsmessage
 golang.org/x/net/http/httpguts
@@ -18,10 +16,10 @@ golang.org/x/net/idna
 golang.org/x/net/lif
 golang.org/x/net/nettest
 golang.org/x/net/route
-# golang.org/x/sys v0.22.0
+# golang.org/x/sys v0.28.0
 ## explicit; go 1.18
 golang.org/x/sys/cpu
-# golang.org/x/text v0.16.0
+# golang.org/x/text v0.21.0
 ## explicit; go 1.18
 golang.org/x/text/secure/bidirule
 golang.org/x/text/transform
diff --git a/src/weak/doc.go b/src/weak/doc.go
new file mode 100644
index 00000000..1af8e4c6
--- /dev/null
+++ b/src/weak/doc.go
@@ -0,0 +1,9 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+/*
+Package weak provides ways to safely reference memory weakly,
+that is, without preventing its reclamation.
+*/
+package weak
diff --git a/src/weak/pointer.go b/src/weak/pointer.go
new file mode 100644
index 00000000..e9d74208
--- /dev/null
+++ b/src/weak/pointer.go
@@ -0,0 +1,96 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package weak
+
+import (
+	"internal/abi"
+	"runtime"
+	"unsafe"
+)
+
+// Pointer is a weak pointer to a value of type T.
+//
+// Just like regular pointers, Pointer may reference any part of an
+// object, such as a field of a struct or an element of an array.
+// Objects that are only pointed to by weak pointers are not considered
+// reachable, and once the object becomes unreachable, [Pointer.Value]
+// may return nil.
+//
+// The primary use-cases for weak pointers are for implementing caches,
+// canonicalization maps (like the unique package), and for tying together
+// the lifetimes of separate values (for example, through a map with weak
+// keys).
+//
+// Two Pointer values always compare equal if the pointers from which they were
+// created compare equal. This property is retained even after the
+// object referenced by the pointer used to create a weak reference is
+// reclaimed.
+// If multiple weak pointers are made to different offsets within the same object
+// (for example, pointers to different fields of the same struct), those pointers
+// will not compare equal.
+// If a weak pointer is created from an object that becomes unreachable, but is
+// then resurrected due to a finalizer, that weak pointer will not compare equal
+// with weak pointers created after the resurrection.
+//
+// Calling [Make] with a nil pointer returns a weak pointer whose [Pointer.Value]
+// always returns nil. The zero value of a Pointer behaves as if it were created
+// by passing nil to [Make] and compares equal with such pointers.
+//
+// [Pointer.Value] is not guaranteed to eventually return nil.
+// [Pointer.Value] may return nil as soon as the object becomes
+// unreachable.
+// Values stored in global variables, or that can be found by tracing
+// pointers from a global variable, are reachable. A function argument or
+// receiver may become unreachable at the last point where the function
+// mentions it. To ensure [Pointer.Value] does not return nil,
+// pass a pointer to the object to the [runtime.KeepAlive] function after
+// the last point where the object must remain reachable.
+//
+// Note that because [Pointer.Value] is not guaranteed to eventually return
+// nil, even after an object is no longer referenced, the runtime is allowed to
+// perform a space-saving optimization that batches objects together in a single
+// allocation slot. The weak pointer for an unreferenced object in such an
+// allocation may never become nil if it always exists in the same batch as a
+// referenced object. Typically, this batching only happens for tiny
+// (on the order of 16 bytes or less) and pointer-free objects.
+type Pointer[T any] struct {
+	// Mention T in the type definition to prevent conversions
+	// between Pointer types, like we do for sync/atomic.Pointer.
+	_ [0]*T
+	u unsafe.Pointer
+}
+
+// Make creates a weak pointer from a pointer to some value of type T.
+func Make[T any](ptr *T) Pointer[T] {
+	// Explicitly force ptr to escape to the heap.
+	ptr = abi.Escape(ptr)
+
+	var u unsafe.Pointer
+	if ptr != nil {
+		u = runtime_registerWeakPointer(unsafe.Pointer(ptr))
+	}
+	runtime.KeepAlive(ptr)
+	return Pointer[T]{u: u}
+}
+
+// Value returns the original pointer used to create the weak pointer.
+// It returns nil if the value pointed to by the original pointer was reclaimed by
+// the garbage collector.
+// If a weak pointer points to an object with a finalizer, then Value will
+// return nil as soon as the object's finalizer is queued for execution.
+func (p Pointer[T]) Value() *T {
+	if p.u == nil {
+		return nil
+	}
+	return (*T)(runtime_makeStrongFromWeak(p.u))
+}
+
+// Implemented in runtime.
+
+//go:linkname runtime_registerWeakPointer
+func runtime_registerWeakPointer(unsafe.Pointer) unsafe.Pointer
+
+//go:linkname runtime_makeStrongFromWeak
+func runtime_makeStrongFromWeak(unsafe.Pointer) unsafe.Pointer
diff --git a/src/internal/weak/pointer_test.go b/src/weak/pointer_test.go
similarity index 77%
rename from src/internal/weak/pointer_test.go
rename to src/weak/pointer_test.go
index 5a861bb9..70c74338 100644
--- a/src/internal/weak/pointer_test.go
+++ b/src/weak/pointer_test.go
@@ -6,11 +6,13 @@ package weak_test
 
 import (
 	"context"
-	"internal/weak"
+	"internal/goarch"
 	"runtime"
 	"sync"
 	"testing"
 	"time"
+	"unsafe"
+	"weak"
 )
 
 type T struct {
@@ -21,40 +23,60 @@ type T struct {
 }
 
 func TestPointer(t *testing.T) {
+	var zero weak.Pointer[T]
+	if zero.Value() != nil {
+		t.Error("Value of zero value of weak.Pointer is not nil")
+	}
+	zeroNil := weak.Make[T](nil)
+	if zeroNil.Value() != nil {
+		t.Error("Value of weak.Make[T](nil) is not nil")
+	}
+
 	bt := new(T)
 	wt := weak.Make(bt)
-	if st := wt.Strong(); st != bt {
+	if st := wt.Value(); st != bt {
 		t.Fatalf("weak pointer is not the same as strong pointer: %p vs. %p", st, bt)
 	}
 	// bt is still referenced.
 	runtime.GC()
 
-	if st := wt.Strong(); st != bt {
+	if st := wt.Value(); st != bt {
 		t.Fatalf("weak pointer is not the same as strong pointer after GC: %p vs. %p", st, bt)
 	}
 	// bt is no longer referenced.
 	runtime.GC()
 
-	if st := wt.Strong(); st != nil {
+	if st := wt.Value(); st != nil {
 		t.Fatalf("expected weak pointer to be nil, got %p", st)
 	}
 }
 
 func TestPointerEquality(t *testing.T) {
+	var zero weak.Pointer[T]
+	zeroNil := weak.Make[T](nil)
+	if zero != zeroNil {
+		t.Error("weak.Make[T](nil) != zero value of weak.Pointer[T]")
+	}
+
 	bt := make([]*T, 10)
 	wt := make([]weak.Pointer[T], 10)
+	wo := make([]weak.Pointer[int], 10)
 	for i := range bt {
 		bt[i] = new(T)
 		wt[i] = weak.Make(bt[i])
+		wo[i] = weak.Make(&bt[i].a)
 	}
 	for i := range bt {
-		st := wt[i].Strong()
+		st := wt[i].Value()
 		if st != bt[i] {
 			t.Fatalf("weak pointer is not the same as strong pointer: %p vs. %p", st, bt[i])
 		}
 		if wp := weak.Make(st); wp != wt[i] {
 			t.Fatalf("new weak pointer not equal to existing weak pointer: %v vs. %v", wp, wt[i])
 		}
+		if wp := weak.Make(&st.a); wp != wo[i] {
+			t.Fatalf("new weak pointer not equal to existing weak pointer: %v vs. %v", wp, wo[i])
+		}
 		if i == 0 {
 			continue
 		}
@@ -65,13 +87,16 @@ func TestPointerEquality(t *testing.T) {
 	// bt is still referenced.
 	runtime.GC()
 	for i := range bt {
-		st := wt[i].Strong()
+		st := wt[i].Value()
 		if st != bt[i] {
 			t.Fatalf("weak pointer is not the same as strong pointer: %p vs. %p", st, bt[i])
 		}
 		if wp := weak.Make(st); wp != wt[i] {
 			t.Fatalf("new weak pointer not equal to existing weak pointer: %v vs. %v", wp, wt[i])
 		}
+		if wp := weak.Make(&st.a); wp != wo[i] {
+			t.Fatalf("new weak pointer not equal to existing weak pointer: %v vs. %v", wp, wo[i])
+		}
 		if i == 0 {
 			continue
 		}
@@ -83,7 +108,7 @@ func TestPointerEquality(t *testing.T) {
 	// bt is no longer referenced.
 	runtime.GC()
 	for i := range bt {
-		st := wt[i].Strong()
+		st := wt[i].Value()
 		if st != nil {
 			t.Fatalf("expected weak pointer to be nil, got %p", st)
 		}
@@ -101,7 +126,7 @@ func TestPointerFinalizer(t *testing.T) {
 	wt := weak.Make(bt)
 	done := make(chan struct{}, 1)
 	runtime.SetFinalizer(bt, func(bt *T) {
-		if wt.Strong() != nil {
+		if wt.Value() != nil {
 			t.Errorf("weak pointer did not go nil before finalizer ran")
 		}
 		done <- struct{}{}
@@ -109,7 +134,7 @@ func TestPointerFinalizer(t *testing.T) {
 
 	// Make sure the weak pointer stays around while bt is live.
 	runtime.GC()
-	if wt.Strong() == nil {
+	if wt.Value() == nil {
 		t.Errorf("weak pointer went nil too soon")
 	}
 	runtime.KeepAlive(bt)
@@ -118,7 +143,7 @@ func TestPointerFinalizer(t *testing.T) {
 	//
 	// Run one cycle to queue the finalizer.
 	runtime.GC()
-	if wt.Strong() != nil {
+	if wt.Value() != nil {
 		t.Errorf("weak pointer did not go nil when finalizer was enqueued")
 	}
 
@@ -127,11 +152,19 @@ func TestPointerFinalizer(t *testing.T) {
 
 	// The weak pointer should still be nil after the finalizer runs.
 	runtime.GC()
-	if wt.Strong() != nil {
+	if wt.Value() != nil {
 		t.Errorf("weak pointer is non-nil even after finalization: %v", wt)
 	}
 }
 
+func TestPointerSize(t *testing.T) {
+	var p weak.Pointer[T]
+	size := unsafe.Sizeof(p)
+	if size != goarch.PtrSize {
+		t.Errorf("weak.Pointer[T] size = %d, want %d", size, goarch.PtrSize)
+	}
+}
+
 // Regression test for issue 69210.
 //
 // Weak-to-strong conversions must shade the new strong pointer, otherwise
@@ -150,7 +183,7 @@ func TestIssue69210(t *testing.T) {
 	// bug happens. Specifically, we want:
 	//
 	// 1. To create a whole bunch of objects that are only weakly-pointed-to,
-	// 2. To call Strong while the GC is in the mark phase,
+	// 2. To call Value while the GC is in the mark phase,
 	// 3. The new strong pointer to be missed by the GC,
 	// 4. The following GC cycle to mark a free object.
 	//
@@ -192,7 +225,7 @@ func TestIssue69210(t *testing.T) {
 					wt := weak.Make(bt)
 					bt = nil
 					time.Sleep(1 * time.Millisecond)
-					bt = wt.Strong()
+					bt = wt.Value()
 					if bt != nil {
 						time.Sleep(4 * time.Millisecond)
 						bt.t = bt
@@ -210,3 +243,12 @@ func TestIssue69210(t *testing.T) {
 	}
 	wg.Wait()
 }
+
+func TestIssue70739(t *testing.T) {
+	x := make([]*int, 4<<16)
+	wx1 := weak.Make(&x[1<<16])
+	wx2 := weak.Make(&x[1<<16])
+	if wx1 != wx2 {
+		t.Fatal("failed to look up special and made duplicate weak handle; see issue #70739")
+	}
+}
diff --git a/test/alias2.go b/test/alias2.go
index 95eb25a9..7a926cc4 100644
--- a/test/alias2.go
+++ b/test/alias2.go
@@ -46,8 +46,8 @@ var _ A0 = T0{}
 var _ T0 = A0{}
 
 // But aliases and original types cannot be used with new types based on them.
-var _ N0 = T0{} // ERROR "cannot use T0{} \(value of type T0\) as N0 value in variable declaration"
-var _ N0 = A0{} // ERROR "cannot use A0{} \(value of type A0\) as N0 value in variable declaration"
+var _ N0 = T0{} // ERROR "cannot use T0{} \(value of struct type T0\) as N0 value in variable declaration"
+var _ N0 = A0{} // ERROR "cannot use A0{} \(value of struct type A0\) as N0 value in variable declaration"
 
 var _ A5 = Value{}
 
@@ -82,10 +82,10 @@ func _() {
 	var _ A0 = T0{}
 	var _ T0 = A0{}
 
-	var _ N0 = T0{} // ERROR "cannot use T0{} \(value of type T0\) as N0 value in variable declaration"
-	var _ N0 = A0{} // ERROR "cannot use A0{} \(value of type A0\) as N0 value in variable declaration"
+	var _ N0 = T0{} // ERROR "cannot use T0{} \(value of struct type T0\) as N0 value in variable declaration"
+	var _ N0 = A0{} // ERROR "cannot use A0{} \(value of struct type A0\) as N0 value in variable declaration"
 
-	var _ A5 = Value{} // ERROR "cannot use Value{} \(value of type reflect\.Value\) as A5 value in variable declaration"
+	var _ A5 = Value{} // ERROR "cannot use Value{} \(value of struct type reflect\.Value\) as A5 value in variable declaration"
 }
 
 // Invalid type alias declarations.
diff --git a/test/assign.go b/test/assign.go
index bdec58b7..5beffee6 100644
--- a/test/assign.go
+++ b/test/assign.go
@@ -9,7 +9,10 @@
 
 package main
 
-import "sync"
+import (
+	"sync"
+	"time"
+)
 
 type T struct {
 	int
@@ -38,7 +41,7 @@ func main() {
 		_ = x
 	}
 	{
-		x := sync.Mutex{0, 0} // ERROR "assignment.*Mutex"
+		x := time.Time{0, 0, nil} // ERROR "assignment.*Time"
 		_ = x
 	}
 	{
diff --git a/test/checkbce.go b/test/checkbce.go
index 71acfb71..49d04744 100644
--- a/test/checkbce.go
+++ b/test/checkbce.go
@@ -159,16 +159,14 @@ func decode1(data []byte) (x uint64) {
 }
 
 func decode2(data []byte) (x uint64) {
-	// TODO(rasky): this should behave like decode1 and compile to no
-	// boundchecks. We're currently not able to remove all of them.
 	for len(data) >= 32 {
 		x += binary.BigEndian.Uint64(data)
 		data = data[8:]
-		x += binary.BigEndian.Uint64(data) // ERROR "Found IsInBounds$"
+		x += binary.BigEndian.Uint64(data)
 		data = data[8:]
-		x += binary.BigEndian.Uint64(data) // ERROR "Found IsInBounds$"
+		x += binary.BigEndian.Uint64(data)
 		data = data[8:]
-		x += binary.BigEndian.Uint64(data) // ERROR "Found IsInBounds$"
+		x += binary.BigEndian.Uint64(data)
 		data = data[8:]
 	}
 	return x
diff --git a/test/closure3.dir/main.go b/test/closure3.dir/main.go
index 441da701..7018a473 100644
--- a/test/closure3.dir/main.go
+++ b/test/closure3.dir/main.go
@@ -20,6 +20,7 @@ func main() {
 		if x := func() int { // ERROR "can inline main.func2" "func literal does not escape"
 			return 1
 		}; x() != 1 { // ERROR "inlining call to main.func2"
+			_ = x // prevent simple deadcode elimination after inlining
 			ppanic("x() != 1")
 		}
 	}
@@ -33,6 +34,7 @@ func main() {
 		if y := func(x int) int { // ERROR "can inline main.func4" "func literal does not escape"
 			return x + 2
 		}; y(40) != 42 { // ERROR "inlining call to main.func4"
+			_ = y // prevent simple deadcode elimination after inlining
 			ppanic("y(40) != 42")
 		}
 	}
@@ -50,7 +52,7 @@ func main() {
 	}
 
 	{
-		func() { // ERROR "func literal does not escape"
+		func() { // ERROR "can inline main.func7"
 			y := func(x int) int { // ERROR "can inline main.func7.1" "func literal does not escape"
 				return x + 2
 			}
@@ -60,7 +62,7 @@ func main() {
 			if y(40) != 41 {
 				ppanic("y(40) != 41")
 			}
-		}()
+		}() // ERROR "func literal does not escape" "inlining call to main.func7"
 	}
 
 	{
@@ -76,7 +78,7 @@ func main() {
 	}
 
 	{
-		func() { // ERROR "func literal does not escape"
+		func() { // ERROR "can inline main.func10"
 			y := func(x int) int { // ERROR "can inline main.func10.1" "func literal does not escape"
 				return x + 2
 			}
@@ -86,7 +88,7 @@ func main() {
 			if y(40) != 41 {
 				ppanic("y(40) != 41")
 			}
-		}()
+		}() // ERROR "func literal does not escape" "inlining call to main.func10"
 	}
 
 	{
@@ -94,7 +96,7 @@ func main() {
 			return x + 2
 		}
 		y, sink = func() (func(int) int, int) { // ERROR "can inline main.func12"
-			return func(x int) int { // ERROR "can inline main.func12"
+			return func(x int) int { // ERROR "can inline main.func12" "func literal escapes to heap"
 				return x + 1
 			}, 42
 		}() // ERROR "func literal does not escape" "inlining call to main.func12"
@@ -104,19 +106,19 @@ func main() {
 	}
 
 	{
-		func() { // ERROR "func literal does not escape"
+		func() { // ERROR "can inline main.func13"
 			y := func(x int) int { // ERROR "func literal does not escape" "can inline main.func13.1"
 				return x + 2
 			}
-			y, sink = func() (func(int) int, int) { // ERROR "can inline main.func13.2"
-				return func(x int) int { // ERROR   "can inline main.func13.2"
+			y, sink = func() (func(int) int, int) { // ERROR "can inline main.func13.2" "can inline main.main.func13.func35"
+				return func(x int) int { // ERROR   "can inline main.func13.2" "func literal escapes to heap"
 					return x + 1
 				}, 42
 			}() // ERROR "func literal does not escape" "inlining call to main.func13.2"
 			if y(40) != 41 {
 				ppanic("y(40) != 41")
 			}
-		}()
+		}() // ERROR "func literal does not escape" "inlining call to main.func13" "inlining call to main.main.func13.func35"
 	}
 
 	{
@@ -132,7 +134,7 @@ func main() {
 	}
 
 	{
-		func() { // ERROR "func literal does not escape"
+		func() { // ERROR "can inline main.func16"
 			y := func(x int) int { // ERROR "can inline main.func16.1" "func literal does not escape"
 				return x + 2
 			}
@@ -142,7 +144,7 @@ func main() {
 			if y(40) != 41 {
 				ppanic("y(40) != 41")
 			}
-		}()
+		}() // ERROR "func literal does not escape" "inlining call to main.func16" "map\[int\]func\(int\) int{...} does not escape" "func literal escapes to heap"
 	}
 
 	{
@@ -158,7 +160,7 @@ func main() {
 	}
 
 	{
-		func() { // ERROR "func literal does not escape"
+		func() { // ERROR "can inline main.func19"
 			y := func(x int) int { // ERROR "can inline main.func19.1" "func literal does not escape"
 				return x + 2
 			}
@@ -168,7 +170,7 @@ func main() {
 			if y(40) != 41 {
 				ppanic("y(40) != 41")
 			}
-		}()
+		}() // ERROR "func literal does not escape" "inlining call to main.func19"
 	}
 
 	{
@@ -181,6 +183,7 @@ func main() {
 		if y := func() int { // ERROR "can inline main.func21" "func literal does not escape"
 			return x
 		}; y() != 42 { // ERROR "inlining call to main.func21"
+			_ = y // prevent simple deadcode elimination after inlining
 			ppanic("y() != 42")
 		}
 	}
@@ -188,17 +191,18 @@ func main() {
 	{
 		x := 42
 		if z := func(y int) int { // ERROR "can inline main.func22"
-			return func() int { // ERROR "can inline main.func22.1" "can inline main.main.func22.func30"
+			return func() int { // ERROR "can inline main.func22.1" "can inline main.main.func22.func40"
 				return x + y
 			}() // ERROR "inlining call to main.func22.1"
-		}(1); z != 43 { // ERROR "inlining call to main.func22" "inlining call to main.main.func22.func30"
+		}(1); z != 43 { // ERROR "inlining call to main.func22" "inlining call to main.main.func22.func40"
 			ppanic("z != 43")
 		}
 		if z := func(y int) int { // ERROR "func literal does not escape" "can inline main.func23"
-			return func() int { // ERROR "can inline main.func23.1" "can inline main.main.func23.func31"
+			return func() int { // ERROR "can inline main.func23.1" "can inline main.main.func23.func41"
 				return x + y
 			}() // ERROR "inlining call to main.func23.1"
-		}; z(1) != 43 { // ERROR "inlining call to main.func23" "inlining call to main.main.func23.func31"
+		}; z(1) != 43 { // ERROR "inlining call to main.func23" "inlining call to main.main.func23.func41"
+			_ = z // prevent simple deadcode elimination after inlining
 			ppanic("z(1) != 43")
 		}
 	}
@@ -206,10 +210,10 @@ func main() {
 	{
 		a := 1
 		func() { // ERROR "can inline main.func24"
-			func() { // ERROR "can inline main.func24" "can inline main.main.func24.func32"
+			func() { // ERROR "can inline main.func24" "can inline main.main.func24.func42"
 				a = 2
 			}() // ERROR "inlining call to main.func24"
-		}() // ERROR "inlining call to main.func24" "inlining call to main.main.func24.func32"
+		}() // ERROR "inlining call to main.func24" "inlining call to main.main.func24.func42"
 		if a != 2 {
 			ppanic("a != 2")
 		}
@@ -217,14 +221,14 @@ func main() {
 
 	{
 		b := 2
-		func(b int) { // ERROR "func literal does not escape"
-			func() { // ERROR "can inline main.func25.1"
+		func(b int) { // ERROR "can inline main.func25"
+			func() { // ERROR "can inline main.func25.1" "can inline main.main.func25.func43"
 				b = 3
 			}() // ERROR "inlining call to main.func25.1"
 			if b != 3 {
 				ppanic("b != 3")
 			}
-		}(b)
+		}(b) // ERROR "inlining call to main.func25" "inlining call to main.main.func25.func43"
 		if b != 2 {
 			ppanic("b != 2")
 		}
@@ -254,13 +258,13 @@ func main() {
 		// revisit those. E.g., func34 and func36 are constructed by the inliner.
 		if r := func(x int) int { // ERROR "can inline main.func27"
 			b := 3
-			return func(y int) int { // ERROR "can inline main.func27.1" "can inline main.main.func27.func34"
+			return func(y int) int { // ERROR "can inline main.func27.1" "can inline main.main.func27.func45"
 				c := 5
-				return func(z int) int { // ERROR "can inline main.func27.1.1" "can inline main.main.func27.func34.1" "can inline main.func27.main.func27.1.2" "can inline main.main.func27.main.main.func27.func34.func36"
+				return func(z int) int { // ERROR "can inline main.func27.1.1" "can inline main.main.func27.func45.1" "can inline main.func27.main.func27.1.2" "can inline main.main.func27.main.main.func27.func45.func48"
 					return a*x + b*y + c*z
 				}(10) // ERROR "inlining call to main.func27.1.1"
 			}(100) // ERROR "inlining call to main.func27.1" "inlining call to main.func27.main.func27.1.2"
-		}(1000); r != 2350 { // ERROR "inlining call to main.func27" "inlining call to main.main.func27.func34" "inlining call to main.main.func27.main.main.func27.func34.func36"
+		}(1000); r != 2350 { // ERROR "inlining call to main.func27" "inlining call to main.main.func27.func45" "inlining call to main.main.func27.main.main.func27.func45.func48"
 			ppanic("r != 2350")
 		}
 	}
@@ -269,16 +273,16 @@ func main() {
 		a := 2
 		if r := func(x int) int { // ERROR "can inline main.func28"
 			b := 3
-			return func(y int) int { // ERROR "can inline main.func28.1" "can inline main.main.func28.func35"
+			return func(y int) int { // ERROR "can inline main.func28.1" "can inline main.main.func28.func46"
 				c := 5
-				func(z int) { // ERROR "can inline main.func28.1.1" "can inline main.func28.main.func28.1.2" "can inline main.main.func28.func35.1" "can inline main.main.func28.main.main.func28.func35.func37"
+				func(z int) { // ERROR "can inline main.func28.1.1" "can inline main.func28.main.func28.1.2" "can inline main.main.func28.func46.1" "can inline main.main.func28.main.main.func28.func46.func49"
 					a = a * x
 					b = b * y
 					c = c * z
 				}(10) // ERROR "inlining call to main.func28.1.1"
 				return a + c
 			}(100) + b // ERROR "inlining call to main.func28.1" "inlining call to main.func28.main.func28.1.2"
-		}(1000); r != 2350 { // ERROR "inlining call to main.func28" "inlining call to main.main.func28.func35" "inlining call to main.main.func28.main.main.func28.func35.func37"
+		}(1000); r != 2350 { // ERROR "inlining call to main.func28" "inlining call to main.main.func28.func46" "inlining call to main.main.func28.main.main.func28.func46.func49"
 			ppanic("r != 2350")
 		}
 		if a != 2000 {
@@ -287,6 +291,25 @@ func main() {
 	}
 }
 
+//go:noinline
+func notmain() {
+	{
+		// This duplicates the first block in main, but without the "_ = x" for closure x.
+		// This allows dead code elimination of x before escape analysis,
+		// thus "func literal does not escape" should not appear.
+		if x := func() int { // ERROR "can inline notmain.func1"
+			return 1
+		}(); x != 1 { // ERROR "inlining call to notmain.func1"
+			ppanic("x != 1")
+		}
+		if x := func() int { // ERROR "can inline notmain.func2"
+			return 1
+		}; x() != 1 { // ERROR "inlining call to notmain.func2"
+			ppanic("x() != 1")
+		}
+	}
+}
+
 //go:noinline
 func ppanic(s string) { // ERROR "leaking param: s"
 	panic(s) // ERROR "s escapes to heap"
diff --git a/test/codegen/arithmetic.go b/test/codegen/arithmetic.go
index e474a10b..4b47f6c1 100644
--- a/test/codegen/arithmetic.go
+++ b/test/codegen/arithmetic.go
@@ -629,3 +629,39 @@ func constantFold3(i, j int) int {
 	r := (5 * i) * (6 * j)
 	return r
 }
+
+// ----------------- //
+//  Integer Min/Max  //
+// ----------------- //
+
+func Int64Min(a, b int64) int64 {
+	// amd64: "CMPQ","CMOVQLT"
+	// arm64: "CMP","CSEL"
+	// riscv64/rva20u64:"BLT\t"
+	// riscv64/rva22u64:"MIN\t"
+	return min(a, b)
+}
+
+func Int64Max(a, b int64) int64 {
+	// amd64: "CMPQ","CMOVQGT"
+	// arm64: "CMP","CSEL"
+	// riscv64/rva20u64:"BLT\t"
+	// riscv64/rva22u64:"MAX\t"
+	return max(a, b)
+}
+
+func Uint64Min(a, b uint64) uint64 {
+	// amd64: "CMPQ","CMOVQCS"
+	// arm64: "CMP","CSEL"
+	// riscv64/rva20u64:"BLTU"
+	// riscv64/rva22u64:"MINU"
+	return min(a, b)
+}
+
+func Uint64Max(a, b uint64) uint64 {
+	// amd64: "CMPQ","CMOVQHI"
+	// arm64: "CMP","CSEL"
+	// riscv64/rva20u64:"BLTU"
+	// riscv64/rva22u64:"MAXU"
+	return max(a, b)
+}
diff --git a/test/codegen/atomics.go b/test/codegen/atomics.go
index feaa31b9..14024dcd 100644
--- a/test/codegen/atomics.go
+++ b/test/codegen/atomics.go
@@ -22,6 +22,74 @@ func (c *Counter) Increment() {
 	// arm64/v8.1:"LDADDALW"
 	// arm64/v8.0:".*arm64HasATOMICS"
 	// arm64/v8.1:-".*arm64HasATOMICS"
+	// amd64:"LOCK",-"CMPXCHG"
 	atomic.AddInt32(&c.count, 1)
 }
 
+func atomicLogical64(x *atomic.Uint64) uint64 {
+	var r uint64
+
+	// arm64/v8.0:"LDCLRALD"
+	// arm64/v8.1:"LDCLRALD"
+	// arm64/v8.0:".*arm64HasATOMICS"
+	// arm64/v8.1:-".*arm64HasATOMICS"
+	// On amd64, make sure we use LOCK+AND instead of CMPXCHG when we don't use the result.
+	// amd64:"LOCK",-"CMPXCHGQ"
+	x.And(11)
+	// arm64/v8.0:"LDCLRALD"
+	// arm64/v8.1:"LDCLRALD"
+	// arm64/v8.0:".*arm64HasATOMICS"
+	// arm64/v8.1:-".*arm64HasATOMICS"
+	// amd64:"LOCK","CMPXCHGQ"
+	r += x.And(22)
+
+	// arm64/v8.0:"LDORALD"
+	// arm64/v8.1:"LDORALD"
+	// arm64/v8.0:".*arm64HasATOMICS"
+	// arm64/v8.1:-".*arm64HasATOMICS"
+	// On amd64, make sure we use LOCK+OR instead of CMPXCHG when we don't use the result.
+	// amd64:"LOCK",-"CMPXCHGQ"
+	x.Or(33)
+	// arm64/v8.0:"LDORALD"
+	// arm64/v8.1:"LDORALD"
+	// arm64/v8.0:".*arm64HasATOMICS"
+	// arm64/v8.1:-".*arm64HasATOMICS"
+	// amd64:"LOCK","CMPXCHGQ"
+	r += x.Or(44)
+
+	return r
+}
+
+func atomicLogical32(x *atomic.Uint32) uint32 {
+	var r uint32
+
+	// arm64/v8.0:"LDCLRALW"
+	// arm64/v8.1:"LDCLRALW"
+	// arm64/v8.0:".*arm64HasATOMICS"
+	// arm64/v8.1:-".*arm64HasATOMICS"
+	// On amd64, make sure we use LOCK+AND instead of CMPXCHG when we don't use the result.
+	// amd64:"LOCK",-"CMPXCHGL"
+	x.And(11)
+	// arm64/v8.0:"LDCLRALW"
+	// arm64/v8.1:"LDCLRALW"
+	// arm64/v8.0:".*arm64HasATOMICS"
+	// arm64/v8.1:-".*arm64HasATOMICS"
+	// amd64:"LOCK","CMPXCHGL"
+	r += x.And(22)
+
+	// arm64/v8.0:"LDORALW"
+	// arm64/v8.1:"LDORALW"
+	// arm64/v8.0:".*arm64HasATOMICS"
+	// arm64/v8.1:-".*arm64HasATOMICS"
+	// On amd64, make sure we use LOCK+OR instead of CMPXCHG when we don't use the result.
+	// amd64:"LOCK",-"CMPXCHGL"
+	x.Or(33)
+	// arm64/v8.0:"LDORALW"
+	// arm64/v8.1:"LDORALW"
+	// arm64/v8.0:".*arm64HasATOMICS"
+	// arm64/v8.1:-".*arm64HasATOMICS"
+	// amd64:"LOCK","CMPXCHGL"
+	r += x.Or(44)
+
+	return r
+}
diff --git a/test/codegen/bitfield.go b/test/codegen/bitfield.go
index 3276af3d..44cf09f8 100644
--- a/test/codegen/bitfield.go
+++ b/test/codegen/bitfield.go
@@ -358,11 +358,15 @@ func rev16w(c uint32) (uint32, uint32, uint32) {
 
 func shift(x uint32, y uint16, z uint8) uint64 {
 	// arm64:-`MOVWU`,-`LSR\t[$]32`
+	// loong64:-`MOVWU`,-`SRLV\t[$]32`
 	a := uint64(x) >> 32
 	// arm64:-`MOVHU
+	// loong64:-`MOVHU`,-`SRLV\t[$]16`
 	b := uint64(y) >> 16
 	// arm64:-`MOVBU`
+	// loong64:-`MOVBU`,-`SRLV\t[$]8`
 	c := uint64(z) >> 8
 	// arm64:`MOVD\tZR`,-`ADD\tR[0-9]+>>16`,-`ADD\tR[0-9]+>>8`,
+	// loong64:`MOVV\t[$]0`,-`ADDVU`
 	return a + b + c
 }
diff --git a/test/codegen/bits.go b/test/codegen/bits.go
index 554e363e..354dbf40 100644
--- a/test/codegen/bits.go
+++ b/test/codegen/bits.go
@@ -366,6 +366,7 @@ func issue48467(x, y uint64) uint64 {
 
 func foldConst(x, y uint64) uint64 {
 	// arm64: "ADDS\t[$]7",-"MOVD\t[$]7"
+	// ppc64x: "ADDC\t[$]7,"
 	d, b := bits.Add64(x, 7, 0)
 	return b & d
 }
diff --git a/test/codegen/bool.go b/test/codegen/bool.go
index 990a9ed1..164ca1b2 100644
--- a/test/codegen/bool.go
+++ b/test/codegen/bool.go
@@ -217,53 +217,53 @@ func TestSetInvGeFp64(x float64, y float64) bool {
 }
 func TestLogicalCompareZero(x *[64]uint64) {
 	// ppc64x:"ANDCC",^"AND"
-	b := x[0]&3
-	if b!=0 {
+	b := x[0] & 3
+	if b != 0 {
 		x[0] = b
 	}
 	// ppc64x:"ANDCC",^"AND"
-	b = x[1]&x[2]
-	if b!=0 {
+	b = x[1] & x[2]
+	if b != 0 {
 		x[1] = b
 	}
 	// ppc64x:"ANDNCC",^"ANDN"
-	b = x[1]&^x[2]
-	if b!=0 {
+	b = x[1] &^ x[2]
+	if b != 0 {
 		x[1] = b
 	}
 	// ppc64x:"ORCC",^"OR"
-	b = x[3]|x[4]
-	if b!=0 {
+	b = x[3] | x[4]
+	if b != 0 {
 		x[3] = b
 	}
 	// ppc64x:"SUBCC",^"SUB"
-	b = x[5]-x[6]
-	if b!=0 {
+	b = x[5] - x[6]
+	if b != 0 {
 		x[5] = b
 	}
 	// ppc64x:"NORCC",^"NOR"
-	b = ^(x[5]|x[6])
-	if b!=0 {
+	b = ^(x[5] | x[6])
+	if b != 0 {
 		x[5] = b
 	}
 	// ppc64x:"XORCC",^"XOR"
-	b = x[7]^x[8]
-	if b!=0 {
+	b = x[7] ^ x[8]
+	if b != 0 {
 		x[7] = b
 	}
 	// ppc64x:"ADDCC",^"ADD"
-	b = x[9]+x[10]
-	if b!=0 {
+	b = x[9] + x[10]
+	if b != 0 {
 		x[9] = b
 	}
 	// ppc64x:"NEGCC",^"NEG"
 	b = -x[11]
-	if b!=0 {
+	if b != 0 {
 		x[11] = b
 	}
 	// ppc64x:"CNTLZDCC",^"CNTLZD"
 	b = uint64(bits.LeadingZeros64(x[12]))
-	if b!=0 {
+	if b != 0 {
 		x[12] = b
 	}
 
@@ -273,4 +273,17 @@ func TestLogicalCompareZero(x *[64]uint64) {
 		x[12] = uint64(c)
 	}
 
+	// ppc64x:"MULHDUCC",^"MULHDU"
+	hi, _ := bits.Mul64(x[13], x[14])
+	if hi != 0 {
+		x[14] = hi
+	}
+
+}
+
+func constantWrite(b bool, p *bool) {
+	if b {
+		// amd64:`MOVB\t[$]1, \(`
+		*p = b
+	}
 }
diff --git a/test/codegen/comparisons.go b/test/codegen/comparisons.go
index e585045a..5fbb31c0 100644
--- a/test/codegen/comparisons.go
+++ b/test/codegen/comparisons.go
@@ -233,9 +233,9 @@ func CmpToZero(a, b, d int32, e, f int64, deOptC0, deOptC1 bool) int32 {
 	// arm:`AND`,-`TST`
 	// 386:`ANDL`
 	c6 := a&d >= 0
-	// arm64:`TST\sR[0-9]+<<3,\sR[0-9]+`
+	// For arm64, could be TST+BGE or AND+TBZ
 	c7 := e&(f<<3) < 0
-	// arm64:`CMN\sR[0-9]+<<3,\sR[0-9]+`
+	// For arm64, could be CMN+BPL or ADD+TBZ
 	c8 := e+(f<<3) < 0
 	// arm64:`TST\sR[0-9],\sR[0-9]+`
 	c9 := e&(-19) < 0
@@ -268,7 +268,7 @@ func CmpToZero(a, b, d int32, e, f int64, deOptC0, deOptC1 bool) int32 {
 	}
 }
 
-func CmpLogicalToZero(a, b, c uint32, d, e uint64) uint64 {
+func CmpLogicalToZero(a, b, c uint32, d, e, f, g uint64) uint64 {
 
 	// ppc64x:"ANDCC",-"CMPW"
 	// wasm:"I64Eqz",-"I32Eqz",-"I64ExtendI32U",-"I32WrapI64"
@@ -289,7 +289,7 @@ func CmpLogicalToZero(a, b, c uint32, d, e uint64) uint64 {
 	}
 	// ppc64x:"ORCC",-"CMP"
 	// wasm:"I64Eqz",-"I32Eqz",-"I64ExtendI32U",-"I32WrapI64"
-	if d|e == 0 {
+	if f|g == 0 {
 		return 1
 	}
 
diff --git a/test/codegen/copy.go b/test/codegen/copy.go
index 17ee8bc8..4329c6d7 100644
--- a/test/codegen/copy.go
+++ b/test/codegen/copy.go
@@ -95,6 +95,7 @@ func moveArchLowering1(b []byte, x *[1]byte) {
 	_ = b[1]
 	// amd64:-".*memmove"
 	// arm64:-".*memmove"
+	// loong64:-".*memmove"
 	// ppc64x:-".*memmove"
 	copy(b, x[:])
 }
@@ -103,6 +104,7 @@ func moveArchLowering2(b []byte, x *[2]byte) {
 	_ = b[2]
 	// amd64:-".*memmove"
 	// arm64:-".*memmove"
+	// loong64:-".*memmove"
 	// ppc64x:-".*memmove"
 	copy(b, x[:])
 }
@@ -111,6 +113,7 @@ func moveArchLowering4(b []byte, x *[4]byte) {
 	_ = b[4]
 	// amd64:-".*memmove"
 	// arm64:-".*memmove"
+	// loong64:-".*memmove"
 	// ppc64x:-".*memmove"
 	copy(b, x[:])
 }
diff --git a/test/codegen/floats.go b/test/codegen/floats.go
index baa745bd..1b85eba3 100644
--- a/test/codegen/floats.go
+++ b/test/codegen/floats.go
@@ -54,11 +54,13 @@ func DivPow2(f1, f2, f3 float64) (float64, float64, float64) {
 
 func indexLoad(b0 []float32, b1 float32, idx int) float32 {
 	// arm64:`FMOVS\s\(R[0-9]+\)\(R[0-9]+<<2\),\sF[0-9]+`
+	// loong64:`MOVF\s\(R[0-9]+\)\(R[0-9]+\),\sF[0-9]+`
 	return b0[idx] * b1
 }
 
 func indexStore(b0 []float64, b1 float64, idx int) {
 	// arm64:`FMOVD\sF[0-9]+,\s\(R[0-9]+\)\(R[0-9]+<<3\)`
+	// loong64:`MOVD\sF[0-9]+,\s\(R[0-9]+\)\(R[0-9]+\)`
 	b0[idx] = b1
 }
 
@@ -70,6 +72,7 @@ func FusedAdd32(x, y, z float32) float32 {
 	// s390x:"FMADDS\t"
 	// ppc64x:"FMADDS\t"
 	// arm64:"FMADDS"
+	// loong64:"FMADDF\t"
 	// riscv64:"FMADDS\t"
 	return x*y + z
 }
@@ -78,11 +81,13 @@ func FusedSub32_a(x, y, z float32) float32 {
 	// s390x:"FMSUBS\t"
 	// ppc64x:"FMSUBS\t"
 	// riscv64:"FMSUBS\t"
+	// loong64:"FMSUBF\t"
 	return x*y - z
 }
 
 func FusedSub32_b(x, y, z float32) float32 {
 	// arm64:"FMSUBS"
+	// loong64:"FNMSUBF\t"
 	// riscv64:"FNMSUBS\t"
 	return z - x*y
 }
@@ -91,6 +96,7 @@ func FusedAdd64(x, y, z float64) float64 {
 	// s390x:"FMADD\t"
 	// ppc64x:"FMADD\t"
 	// arm64:"FMADDD"
+	// loong64:"FMADDD\t"
 	// riscv64:"FMADDD\t"
 	return x*y + z
 }
@@ -99,11 +105,13 @@ func FusedSub64_a(x, y, z float64) float64 {
 	// s390x:"FMSUB\t"
 	// ppc64x:"FMSUB\t"
 	// riscv64:"FMSUBD\t"
+	// loong64:"FMSUBD\t"
 	return x*y - z
 }
 
 func FusedSub64_b(x, y, z float64) float64 {
 	// arm64:"FMSUBD"
+	// loong64:"FNMSUBD\t"
 	// riscv64:"FNMSUBD\t"
 	return z - x*y
 }
@@ -164,6 +172,7 @@ func ArrayCopy(a [16]byte) (b [16]byte) {
 func Float64Min(a, b float64) float64 {
 	// amd64:"MINSD"
 	// arm64:"FMIND"
+	// loong64:"FMIND"
 	// riscv64:"FMIN"
 	// ppc64/power9:"XSMINJDP"
 	// ppc64/power10:"XSMINJDP"
@@ -173,6 +182,7 @@ func Float64Min(a, b float64) float64 {
 func Float64Max(a, b float64) float64 {
 	// amd64:"MINSD"
 	// arm64:"FMAXD"
+	// loong64:"FMAXD"
 	// riscv64:"FMAX"
 	// ppc64/power9:"XSMAXJDP"
 	// ppc64/power10:"XSMAXJDP"
@@ -182,6 +192,7 @@ func Float64Max(a, b float64) float64 {
 func Float32Min(a, b float32) float32 {
 	// amd64:"MINSS"
 	// arm64:"FMINS"
+	// loong64:"FMINF"
 	// riscv64:"FMINS"
 	// ppc64/power9:"XSMINJDP"
 	// ppc64/power10:"XSMINJDP"
@@ -191,6 +202,7 @@ func Float32Min(a, b float32) float32 {
 func Float32Max(a, b float32) float32 {
 	// amd64:"MINSS"
 	// arm64:"FMAXS"
+	// loong64:"FMAXF"
 	// riscv64:"FMAXS"
 	// ppc64/power9:"XSMAXJDP"
 	// ppc64/power10:"XSMAXJDP"
@@ -227,3 +239,12 @@ func Float64DenormalFloat32Constant() float64 {
 	// ppc64x:"FMOVD\t[$]f64\\.3800000000000000\\(SB\\)"
 	return 0x1p-127
 }
+
+func Float64ConstantStore(p *float64) {
+	// amd64: "MOVQ\t[$]4617801906721357038"
+	*p = 5.432
+}
+func Float32ConstantStore(p *float32) {
+	// amd64: "MOVL\t[$]1085133554"
+	*p = 5.432
+}
diff --git a/src/cmd/vendor/golang.org/x/tools/cmd/bisect/go119.go b/test/codegen/issue59297.go
similarity index 52%
rename from src/cmd/vendor/golang.org/x/tools/cmd/bisect/go119.go
rename to test/codegen/issue59297.go
index debe4e0c..1703a1a8 100644
--- a/src/cmd/vendor/golang.org/x/tools/cmd/bisect/go119.go
+++ b/test/codegen/issue59297.go
@@ -1,13 +1,17 @@
+// asmcheck
+
 // Copyright 2023 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build !go1.20
+package codegen
 
-package main
-
-import "os/exec"
-
-func cmdInterrupt(cmd *exec.Cmd) {
-	// cmd.Cancel and cmd.WaitDelay not available before Go 1.20.
+func f(x, y int, p *int) {
+	// amd64:`MOVQ\sAX, BX`
+	h(8, x)
+	*p = y
+}
+
+//go:noinline
+func h(a, b int) {
 }
diff --git a/test/codegen/issue68845.go b/test/codegen/issue68845.go
new file mode 100644
index 00000000..3b22471d
--- /dev/null
+++ b/test/codegen/issue68845.go
@@ -0,0 +1,52 @@
+// asmcheck
+
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package codegen
+
+type T1 struct {
+	x string
+}
+
+func f1() *T1 {
+	// amd64:-`MOVQ\s[$]0`,-`MOVUPS\sX15`
+	return &T1{}
+}
+
+type T2 struct {
+	x, y string
+}
+
+func f2() *T2 {
+	// amd64:-`MOVQ\s[$]0`,-`MOVUPS\sX15`
+	return &T2{}
+}
+
+type T3 struct {
+	x complex128
+}
+
+func f3() *T3 {
+	// amd64:-`MOVQ\s[$]0`,-`MOVUPS\sX15`
+	return &T3{}
+}
+
+type T4 struct {
+	x []byte
+}
+
+func f4() *T4 {
+	// amd64:-`MOVQ\s[$]0`,-`MOVUPS\sX15`
+	return &T4{}
+}
+
+type T5 struct {
+	x any
+}
+
+func f5() *T5 {
+	// amd64:-`MOVQ\s[$]0`,-`MOVUPS\sX15`
+	return &T5{}
+}
diff --git a/test/codegen/issue69635.go b/test/codegen/issue69635.go
new file mode 100644
index 00000000..de68bf12
--- /dev/null
+++ b/test/codegen/issue69635.go
@@ -0,0 +1,13 @@
+// asmcheck
+
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package codegen
+
+func calc(a uint64) uint64 {
+	v := a >> 20 & 0x7f
+	// amd64: `SHRQ\s\$17, AX$`, `ANDL\s\$1016, AX$`
+	return v << 3
+}
diff --git a/test/codegen/maps.go b/test/codegen/maps.go
index 25505799..c4aed335 100644
--- a/test/codegen/maps.go
+++ b/test/codegen/maps.go
@@ -74,7 +74,7 @@ func LookupStringConversionKeyedArrayLit(m map[[2]string]int, bytes []byte) int
 
 func MapClearReflexive(m map[int]int) {
 	// amd64:`.*runtime\.mapclear`
-	// amd64:-`.*runtime\.mapiterinit`
+	// amd64:-`.*runtime\.(mapiterinit|mapIterStart)`
 	for k := range m {
 		delete(m, k)
 	}
@@ -83,7 +83,7 @@ func MapClearReflexive(m map[int]int) {
 func MapClearIndirect(m map[int]int) {
 	s := struct{ m map[int]int }{m: m}
 	// amd64:`.*runtime\.mapclear`
-	// amd64:-`.*runtime\.mapiterinit`
+	// amd64:-`.*runtime\.(mapiterinit|mapIterStart)`
 	for k := range s.m {
 		delete(s.m, k)
 	}
@@ -91,14 +91,14 @@ func MapClearIndirect(m map[int]int) {
 
 func MapClearPointer(m map[*byte]int) {
 	// amd64:`.*runtime\.mapclear`
-	// amd64:-`.*runtime\.mapiterinit`
+	// amd64:-`.*runtime\.(mapiterinit|mapIterStart)`
 	for k := range m {
 		delete(m, k)
 	}
 }
 
 func MapClearNotReflexive(m map[float64]int) {
-	// amd64:`.*runtime\.mapiterinit`
+	// amd64:`.*runtime\.(mapiterinit|mapIterStart)`
 	// amd64:-`.*runtime\.mapclear`
 	for k := range m {
 		delete(m, k)
@@ -106,7 +106,7 @@ func MapClearNotReflexive(m map[float64]int) {
 }
 
 func MapClearInterface(m map[interface{}]int) {
-	// amd64:`.*runtime\.mapiterinit`
+	// amd64:`.*runtime\.(mapiterinit|mapIterStart)`
 	// amd64:-`.*runtime\.mapclear`
 	for k := range m {
 		delete(m, k)
@@ -115,7 +115,7 @@ func MapClearInterface(m map[interface{}]int) {
 
 func MapClearSideEffect(m map[int]int) int {
 	k := 0
-	// amd64:`.*runtime\.mapiterinit`
+	// amd64:`.*runtime\.(mapiterinit|mapIterStart)`
 	// amd64:-`.*runtime\.mapclear`
 	for k = range m {
 		delete(m, k)
diff --git a/test/codegen/math.go b/test/codegen/math.go
index eb6e927d..4ce5fa41 100644
--- a/test/codegen/math.go
+++ b/test/codegen/math.go
@@ -132,6 +132,7 @@ func fma(x, y, z float64) float64 {
 	// amd64:"VFMADD231SD"
 	// arm/6:"FMULAD"
 	// arm64:"FMADDD"
+	// loong64:"FMADDD"
 	// s390x:"FMADD"
 	// ppc64x:"FMADD"
 	// riscv64:"FMADDD"
@@ -156,6 +157,7 @@ func fnma(x, y, z float64) float64 {
 func fromFloat64(f64 float64) uint64 {
 	// amd64:"MOVQ\tX.*, [^X].*"
 	// arm64:"FMOVD\tF.*, R.*"
+	// loong64:"MOVV\tF.*, R.*"
 	// ppc64x:"MFVSRD"
 	// mips64/hardfloat:"MOVV\tF.*, R.*"
 	return math.Float64bits(f64+1) + 1
@@ -164,6 +166,7 @@ func fromFloat64(f64 float64) uint64 {
 func fromFloat32(f32 float32) uint32 {
 	// amd64:"MOVL\tX.*, [^X].*"
 	// arm64:"FMOVS\tF.*, R.*"
+	// loong64:"MOVW\tF.*, R.*"
 	// mips64/hardfloat:"MOVW\tF.*, R.*"
 	return math.Float32bits(f32+1) + 1
 }
@@ -171,6 +174,7 @@ func fromFloat32(f32 float32) uint32 {
 func toFloat64(u64 uint64) float64 {
 	// amd64:"MOVQ\t[^X].*, X.*"
 	// arm64:"FMOVD\tR.*, F.*"
+	// loong64:"MOVV\tR.*, F.*"
 	// ppc64x:"MTVSRD"
 	// mips64/hardfloat:"MOVV\tR.*, F.*"
 	return math.Float64frombits(u64+1) + 1
@@ -179,6 +183,7 @@ func toFloat64(u64 uint64) float64 {
 func toFloat32(u32 uint32) float32 {
 	// amd64:"MOVL\t[^X].*, X.*"
 	// arm64:"FMOVS\tR.*, F.*"
+	// loong64:"MOVW\tR.*, F.*"
 	// mips64/hardfloat:"MOVW\tR.*, F.*"
 	return math.Float32frombits(u32+1) + 1
 }
diff --git a/test/codegen/mathbits.go b/test/codegen/mathbits.go
index a743eaf3..baed4f7c 100644
--- a/test/codegen/mathbits.go
+++ b/test/codegen/mathbits.go
@@ -17,6 +17,7 @@ func LeadingZeros(n uint) int {
 	// amd64/v3:"LZCNTQ", -"BSRQ"
 	// s390x:"FLOGR"
 	// arm:"CLZ" arm64:"CLZ"
+	// loong64:"CLZV",-"SUB"
 	// mips:"CLZ"
 	// wasm:"I64Clz"
 	// ppc64x:"CNTLZD"
@@ -28,6 +29,7 @@ func LeadingZeros64(n uint64) int {
 	// amd64/v3:"LZCNTQ", -"BSRQ"
 	// s390x:"FLOGR"
 	// arm:"CLZ" arm64:"CLZ"
+	// loong64:"CLZV",-"SUB"
 	// mips:"CLZ"
 	// wasm:"I64Clz"
 	// ppc64x:"CNTLZD"
@@ -39,6 +41,7 @@ func LeadingZeros32(n uint32) int {
 	// amd64/v3: "LZCNTL",- "BSRL"
 	// s390x:"FLOGR"
 	// arm:"CLZ" arm64:"CLZW"
+	// loong64:"CLZW",-"SUB"
 	// mips:"CLZ"
 	// wasm:"I64Clz"
 	// ppc64x:"CNTLZW"
@@ -50,6 +53,7 @@ func LeadingZeros16(n uint16) int {
 	// amd64/v3: "LZCNTL",- "BSRL"
 	// s390x:"FLOGR"
 	// arm:"CLZ" arm64:"CLZ"
+	// loong64:"CLZV"
 	// mips:"CLZ"
 	// wasm:"I64Clz"
 	// ppc64x:"CNTLZD"
@@ -61,6 +65,7 @@ func LeadingZeros8(n uint8) int {
 	// amd64/v3: "LZCNTL",- "BSRL"
 	// s390x:"FLOGR"
 	// arm:"CLZ" arm64:"CLZ"
+	// loong64:"CLZV"
 	// mips:"CLZ"
 	// wasm:"I64Clz"
 	// ppc64x:"CNTLZD"
@@ -76,6 +81,7 @@ func Len(n uint) int {
 	// amd64/v3: "LZCNTQ"
 	// s390x:"FLOGR"
 	// arm:"CLZ" arm64:"CLZ"
+	// loong64:"CLZV"
 	// mips:"CLZ"
 	// wasm:"I64Clz"
 	// ppc64x:"SUBC","CNTLZD"
@@ -87,6 +93,7 @@ func Len64(n uint64) int {
 	// amd64/v3: "LZCNTQ"
 	// s390x:"FLOGR"
 	// arm:"CLZ" arm64:"CLZ"
+	// loong64:"CLZV"
 	// mips:"CLZ"
 	// wasm:"I64Clz"
 	// ppc64x:"SUBC","CNTLZD"
@@ -94,15 +101,22 @@ func Len64(n uint64) int {
 }
 
 func SubFromLen64(n uint64) int {
+	// loong64:"CLZV",-"ADD"
 	// ppc64x:"CNTLZD",-"SUBC"
 	return 64 - bits.Len64(n)
 }
 
+func CompareWithLen64(n uint64) bool {
+	// loong64:"CLZV",-"ADD",-"[$]64",-"[$]9"
+	return bits.Len64(n) < 9
+}
+
 func Len32(n uint32) int {
 	// amd64/v1,amd64/v2:"BSRQ","LEAQ",-"CMOVQEQ"
 	// amd64/v3: "LZCNTL"
 	// s390x:"FLOGR"
 	// arm:"CLZ" arm64:"CLZ"
+	// loong64:"CLZW"
 	// mips:"CLZ"
 	// wasm:"I64Clz"
 	// ppc64x: "CNTLZW"
@@ -114,6 +128,7 @@ func Len16(n uint16) int {
 	// amd64/v3: "LZCNTL"
 	// s390x:"FLOGR"
 	// arm:"CLZ" arm64:"CLZ"
+	// loong64:"CLZV"
 	// mips:"CLZ"
 	// wasm:"I64Clz"
 	// ppc64x:"SUBC","CNTLZD"
@@ -125,6 +140,7 @@ func Len8(n uint8) int {
 	// amd64/v3: "LZCNTL"
 	// s390x:"FLOGR"
 	// arm:"CLZ" arm64:"CLZ"
+	// loong64:"CLZV"
 	// mips:"CLZ"
 	// wasm:"I64Clz"
 	// ppc64x:"SUBC","CNTLZD"
@@ -140,6 +156,7 @@ func OnesCount(n uint) int {
 	// amd64/v2:-".*x86HasPOPCNT" amd64/v3:-".*x86HasPOPCNT"
 	// amd64:"POPCNTQ"
 	// arm64:"VCNT","VUADDLV"
+	// loong64:"VPCNTV"
 	// s390x:"POPCNT"
 	// ppc64x:"POPCNTD"
 	// wasm:"I64Popcnt"
@@ -150,6 +167,7 @@ func OnesCount64(n uint64) int {
 	// amd64/v2:-".*x86HasPOPCNT" amd64/v3:-".*x86HasPOPCNT"
 	// amd64:"POPCNTQ"
 	// arm64:"VCNT","VUADDLV"
+	// loong64:"VPCNTV"
 	// s390x:"POPCNT"
 	// ppc64x:"POPCNTD"
 	// wasm:"I64Popcnt"
@@ -160,6 +178,7 @@ func OnesCount32(n uint32) int {
 	// amd64/v2:-".*x86HasPOPCNT" amd64/v3:-".*x86HasPOPCNT"
 	// amd64:"POPCNTL"
 	// arm64:"VCNT","VUADDLV"
+	// loong64:"VPCNTW"
 	// s390x:"POPCNT"
 	// ppc64x:"POPCNTW"
 	// wasm:"I64Popcnt"
@@ -170,6 +189,7 @@ func OnesCount16(n uint16) int {
 	// amd64/v2:-".*x86HasPOPCNT" amd64/v3:-".*x86HasPOPCNT"
 	// amd64:"POPCNTL"
 	// arm64:"VCNT","VUADDLV"
+	// loong64:"VPCNTH"
 	// s390x:"POPCNT"
 	// ppc64x:"POPCNTW"
 	// wasm:"I64Popcnt"
@@ -183,6 +203,35 @@ func OnesCount8(n uint8) int {
 	return bits.OnesCount8(n)
 }
 
+// ------------------ //
+//    bits.Reverse    //
+// ------------------ //
+
+func Reverse(n uint) uint {
+	// loong64:"BITREVV"
+	return bits.Reverse(n)
+}
+
+func Reverse64(n uint64) uint64 {
+	// loong64:"BITREVV"
+	return bits.Reverse64(n)
+}
+
+func Reverse32(n uint32) uint32 {
+	// loong64:"BITREVW"
+	return bits.Reverse32(n)
+}
+
+func Reverse16(n uint16) uint16 {
+	// loong64:"BITREV4B","REVB2H"
+	return bits.Reverse16(n)
+}
+
+func Reverse8(n uint8) uint8 {
+	// loong64:"BITREV4B"
+	return bits.Reverse8(n)
+}
+
 // ----------------------- //
 //    bits.ReverseBytes    //
 // ----------------------- //
@@ -192,6 +241,7 @@ func ReverseBytes(n uint) uint {
 	// 386:"BSWAPL"
 	// s390x:"MOVDBR"
 	// arm64:"REV"
+	// loong64:"REVBV"
 	return bits.ReverseBytes(n)
 }
 
@@ -201,6 +251,7 @@ func ReverseBytes64(n uint64) uint64 {
 	// s390x:"MOVDBR"
 	// arm64:"REV"
 	// ppc64x/power10: "BRD"
+	// loong64:"REVBV"
 	return bits.ReverseBytes64(n)
 }
 
@@ -209,6 +260,7 @@ func ReverseBytes32(n uint32) uint32 {
 	// 386:"BSWAPL"
 	// s390x:"MOVWBR"
 	// arm64:"REVW"
+	// loong64:"REVB2W"
 	// ppc64x/power10: "BRW"
 	return bits.ReverseBytes32(n)
 }
@@ -219,6 +271,7 @@ func ReverseBytes16(n uint16) uint16 {
 	// arm/5:"SLL","SRL","ORR"
 	// arm/6:"REV16"
 	// arm/7:"REV16"
+	// loong64:"REVB2H"
 	// ppc64x/power10: "BRH"
 	return bits.ReverseBytes16(n)
 }
@@ -230,7 +283,9 @@ func ReverseBytes16(n uint16) uint16 {
 func RotateLeft64(n uint64) uint64 {
 	// amd64:"ROLQ"
 	// arm64:"ROR"
+	// loong64:"ROTRV"
 	// ppc64x:"ROTL"
+	// riscv64:"RORI"
 	// s390x:"RISBGZ\t[$]0, [$]63, [$]37, "
 	// wasm:"I64Rotl"
 	return bits.RotateLeft64(n, 37)
@@ -240,7 +295,9 @@ func RotateLeft32(n uint32) uint32 {
 	// amd64:"ROLL" 386:"ROLL"
 	// arm:`MOVW\tR[0-9]+@>23`
 	// arm64:"RORW"
+	// loong64:"ROTR\t"
 	// ppc64x:"ROTLW"
+	// riscv64:"RORIW"
 	// s390x:"RLL"
 	// wasm:"I32Rotl"
 	return bits.RotateLeft32(n, 9)
@@ -249,19 +306,23 @@ func RotateLeft32(n uint32) uint32 {
 func RotateLeft16(n uint16, s int) uint16 {
 	// amd64:"ROLW" 386:"ROLW"
 	// arm64:"RORW",-"CSEL"
+	// loong64:"ROTR\t","SLLV"
 	return bits.RotateLeft16(n, s)
 }
 
 func RotateLeft8(n uint8, s int) uint8 {
 	// amd64:"ROLB" 386:"ROLB"
 	// arm64:"LSL","LSR",-"CSEL"
+	// loong64:"OR","SLLV","SRLV"
 	return bits.RotateLeft8(n, s)
 }
 
 func RotateLeftVariable(n uint, m int) uint {
 	// amd64:"ROLQ"
 	// arm64:"ROR"
+	// loong64:"ROTRV"
 	// ppc64x:"ROTL"
+	// riscv64:"ROL"
 	// s390x:"RLLG"
 	// wasm:"I64Rotl"
 	return bits.RotateLeft(n, m)
@@ -270,7 +331,9 @@ func RotateLeftVariable(n uint, m int) uint {
 func RotateLeftVariable64(n uint64, m int) uint64 {
 	// amd64:"ROLQ"
 	// arm64:"ROR"
+	// loong64:"ROTRV"
 	// ppc64x:"ROTL"
+	// riscv64:"ROL"
 	// s390x:"RLLG"
 	// wasm:"I64Rotl"
 	return bits.RotateLeft64(n, m)
@@ -280,7 +343,9 @@ func RotateLeftVariable32(n uint32, m int) uint32 {
 	// arm:`MOVW\tR[0-9]+@>R[0-9]+`
 	// amd64:"ROLL"
 	// arm64:"RORW"
+	// loong64:"ROTR\t"
 	// ppc64x:"ROTLW"
+	// riscv64:"ROLW"
 	// s390x:"RLL"
 	// wasm:"I32Rotl"
 	return bits.RotateLeft32(n, m)
@@ -296,6 +361,7 @@ func TrailingZeros(n uint) int {
 	// 386:"BSFL"
 	// arm:"CLZ"
 	// arm64:"RBIT","CLZ"
+	// loong64:"CTZV"
 	// s390x:"FLOGR"
 	// ppc64x/power8:"ANDN","POPCNTD"
 	// ppc64x/power9: "CNTTZD"
@@ -308,6 +374,7 @@ func TrailingZeros64(n uint64) int {
 	// amd64/v3:"TZCNTQ"
 	// 386:"BSFL"
 	// arm64:"RBIT","CLZ"
+	// loong64:"CTZV"
 	// s390x:"FLOGR"
 	// ppc64x/power8:"ANDN","POPCNTD"
 	// ppc64x/power9: "CNTTZD"
@@ -327,6 +394,7 @@ func TrailingZeros32(n uint32) int {
 	// 386:"BSFL"
 	// arm:"CLZ"
 	// arm64:"RBITW","CLZW"
+	// loong64:"CTZW"
 	// s390x:"FLOGR","MOVWZ"
 	// ppc64x/power8:"ANDN","POPCNTW"
 	// ppc64x/power9: "CNTTZW"
@@ -339,6 +407,7 @@ func TrailingZeros16(n uint16) int {
 	// 386:"BSFL\t"
 	// arm:"ORR\t\\$65536","CLZ",-"MOVHU\tR"
 	// arm64:"ORR\t\\$65536","RBITW","CLZW",-"MOVHU\tR",-"RBIT\t",-"CLZ\t"
+	// loong64:"CTZV"
 	// s390x:"FLOGR","OR\t\\$65536"
 	// ppc64x/power8:"POPCNTD","ORIS\\t\\$1"
 	// ppc64x/power9:"CNTTZD","ORIS\\t\\$1"
@@ -351,6 +420,7 @@ func TrailingZeros8(n uint8) int {
 	// 386:"BSFL"
 	// arm:"ORR\t\\$256","CLZ",-"MOVBU\tR"
 	// arm64:"ORR\t\\$256","RBITW","CLZW",-"MOVBU\tR",-"RBIT\t",-"CLZ\t"
+	// loong64:"CTZV"
 	// s390x:"FLOGR","OR\t\\$256"
 	// wasm:"I64Ctz"
 	return bits.TrailingZeros8(n)
diff --git a/test/codegen/memcombine.go b/test/codegen/memcombine.go
index ff67a442..e1cae0e4 100644
--- a/test/codegen/memcombine.go
+++ b/test/codegen/memcombine.go
@@ -19,6 +19,7 @@ func load_le64(b []byte) uint64 {
 	// amd64:`MOVQ\s\(.*\),`,-`MOV[BWL]\t[^$]`,-`OR`
 	// s390x:`MOVDBR\s\(.*\),`
 	// arm64:`MOVD\s\(R[0-9]+\),`,-`MOV[BHW]`
+	// loong64:`MOVBU\s\(R[0-9]+\),`
 	// ppc64le:`MOVD\s`,-`MOV[BHW]Z`
 	// ppc64:`MOVDBR\s`,-`MOV[BHW]Z`
 	return binary.LittleEndian.Uint64(b)
@@ -28,6 +29,7 @@ func load_le64_idx(b []byte, idx int) uint64 {
 	// amd64:`MOVQ\s\(.*\)\(.*\*1\),`,-`MOV[BWL]\t[^$]`,-`OR`
 	// s390x:`MOVDBR\s\(.*\)\(.*\*1\),`
 	// arm64:`MOVD\s\(R[0-9]+\)\(R[0-9]+\),`,-`MOV[BHW]`
+	// loong64:`MOVBU\s\(R[0-9]+\)\(R[0-9]+\),`
 	// ppc64le:`MOVD\s`,-`MOV[BHW]Z\s`
 	// ppc64:`MOVDBR\s`,-`MOV[BHW]Z\s`
 	return binary.LittleEndian.Uint64(b[idx:])
@@ -38,6 +40,7 @@ func load_le32(b []byte) uint32 {
 	// 386:`MOVL\s\(.*\),`,-`MOV[BW]`,-`OR`
 	// s390x:`MOVWBR\s\(.*\),`
 	// arm64:`MOVWU\s\(R[0-9]+\),`,-`MOV[BH]`
+	// loong64:`MOVBU\s\(R[0-9]+\),`
 	// ppc64le:`MOVWZ\s`,-`MOV[BH]Z\s`
 	// ppc64:`MOVWBR\s`,-`MOV[BH]Z\s`
 	return binary.LittleEndian.Uint32(b)
@@ -48,6 +51,7 @@ func load_le32_idx(b []byte, idx int) uint32 {
 	// 386:`MOVL\s\(.*\)\(.*\*1\),`,-`MOV[BW]`,-`OR`
 	// s390x:`MOVWBR\s\(.*\)\(.*\*1\),`
 	// arm64:`MOVWU\s\(R[0-9]+\)\(R[0-9]+\),`,-`MOV[BH]`
+	// loong64:`MOVBU\s\(R[0-9]+\)\(R[0-9]+\),`
 	// ppc64le:`MOVWZ\s`,-`MOV[BH]Z\s`
 	// ppc64:`MOVWBR\s`,-`MOV[BH]Z\s'
 	return binary.LittleEndian.Uint32(b[idx:])
@@ -57,6 +61,7 @@ func load_le16(b []byte) uint16 {
 	// amd64:`MOVWLZX\s\(.*\),`,-`MOVB`,-`OR`
 	// ppc64le:`MOVHZ\s`,-`MOVBZ`
 	// arm64:`MOVHU\s\(R[0-9]+\),`,-`MOVB`
+	// loong64:`MOVBU\s\(R[0-9]+\),`
 	// s390x:`MOVHBR\s\(.*\),`
 	// ppc64:`MOVHBR\s`,-`MOVBZ`
 	return binary.LittleEndian.Uint16(b)
@@ -67,6 +72,7 @@ func load_le16_idx(b []byte, idx int) uint16 {
 	// ppc64le:`MOVHZ\s`,-`MOVBZ`
 	// ppc64:`MOVHBR\s`,-`MOVBZ`
 	// arm64:`MOVHU\s\(R[0-9]+\)\(R[0-9]+\),`,-`MOVB`
+	// loong64:`MOVBU\s\(R[0-9]+\)\(R[0-9]+\),`
 	// s390x:`MOVHBR\s\(.*\)\(.*\*1\),`
 	return binary.LittleEndian.Uint16(b[idx:])
 }
@@ -938,3 +944,29 @@ func issue66413(p *struct {
 	p.c = true
 	p.d = 12
 }
+
+func issue70300(v uint64) (b [8]byte) {
+	// amd64:"MOVQ",-"MOVB"
+	b[0] = byte(v)
+	b[1] = byte(v >> 8)
+	b[2] = byte(v >> 16)
+	b[3] = byte(v >> 24)
+	b[4] = byte(v >> 32)
+	b[5] = byte(v >> 40)
+	b[6] = byte(v >> 48)
+	b[7] = byte(v >> 56)
+	return b
+}
+
+func issue70300Reverse(v uint64) (b [8]byte) {
+	// amd64:"MOVQ",-"MOVB"
+	b[7] = byte(v >> 56)
+	b[6] = byte(v >> 48)
+	b[5] = byte(v >> 40)
+	b[4] = byte(v >> 32)
+	b[3] = byte(v >> 24)
+	b[2] = byte(v >> 16)
+	b[1] = byte(v >> 8)
+	b[0] = byte(v)
+	return b
+}
diff --git a/test/codegen/shift.go b/test/codegen/shift.go
index 6a2a6c40..2d8cf868 100644
--- a/test/codegen/shift.go
+++ b/test/codegen/shift.go
@@ -462,12 +462,6 @@ func checkMergedShifts64(a [256]uint32, b [256]uint64, c [256]byte, v uint64) {
 	a[2] = a[v>>25&0x7F]
 	// ppc64x: -"CLRLSLDI", "RLWNM\t[$]3, R[0-9]+, [$]29, [$]29, R[0-9]+"
 	a[3] = a[(v>>31)&0x01]
-	// ppc64x: "SRD", "CLRLSLDI", -"RLWNM"
-	a[4] = a[(v>>30)&0x07]
-	// ppc64x: "SRD", "CLRLSLDI", -"RLWNM"
-	a[5] = a[(v>>32)&0x01]
-	// ppc64x: "SRD", "CLRLSLDI", -"RLWNM"
-	a[6] = a[(v>>34)&0x03]
 	// ppc64x: -"CLRLSLDI", "RLWNM\t[$]12, R[0-9]+, [$]21, [$]28, R[0-9]+"
 	b[0] = b[uint8(v>>23)]
 	// ppc64x: -"CLRLSLDI", "RLWNM\t[$]15, R[0-9]+, [$]21, [$]28, R[0-9]+"
@@ -476,7 +470,7 @@ func checkMergedShifts64(a [256]uint32, b [256]uint64, c [256]byte, v uint64) {
 	b[2] = b[((uint64((uint32(v) >> 21)) & 0x3f) << 4)]
 	// ppc64x: "RLWNM\t[$]11, R[0-9]+, [$]10, [$]15"
 	c[0] = c[((v>>5)&0x3F)<<16]
-	// ppc64x: "RLWNM\t[$]0, R[0-9]+, [$]19, [$]24"
+	// ppc64x: "ANDCC\t[$]8064,"
 	c[1] = c[((v>>7)&0x3F)<<7]
 }
 
@@ -520,3 +514,20 @@ func checkShiftToMask(u []uint64, s []int64) {
 	// amd64:-"SHR",-"SHL","ANDQ"
 	u[1] = u[1] << 5 >> 5
 }
+
+//
+// Left shift with addition.
+//
+
+func checkLeftShiftWithAddition(a int64, b int64) int64 {
+	// riscv64/rva20u64: "SLLI","ADD"
+	// riscv64/rva22u64: "SH1ADD"
+	a = a + b<<1
+	// riscv64/rva20u64: "SLLI","ADD"
+	// riscv64/rva22u64: "SH2ADD"
+	a = a + b<<2
+	// riscv64/rva20u64: "SLLI","ADD"
+	// riscv64/rva22u64: "SH3ADD"
+	a = a + b<<3
+	return a
+}
diff --git a/test/codegen/slices.go b/test/codegen/slices.go
index a38fe77e..9e8990c5 100644
--- a/test/codegen/slices.go
+++ b/test/codegen/slices.go
@@ -47,6 +47,7 @@ func SliceExtensionConst(s []int) []int {
 	// amd64:-`.*runtime\.makeslice`
 	// amd64:-`.*runtime\.panicmakeslicelen`
 	// amd64:"MOVUPS\tX15"
+	// loong64:-`.*runtime\.memclrNoHeapPointers`
 	// ppc64x:-`.*runtime\.memclrNoHeapPointers`
 	// ppc64x:-`.*runtime\.makeslice`
 	// ppc64x:-`.*runtime\.panicmakeslicelen`
@@ -58,6 +59,7 @@ func SliceExtensionConstInt64(s []int) []int {
 	// amd64:-`.*runtime\.makeslice`
 	// amd64:-`.*runtime\.panicmakeslicelen`
 	// amd64:"MOVUPS\tX15"
+	// loong64:-`.*runtime\.memclrNoHeapPointers`
 	// ppc64x:-`.*runtime\.memclrNoHeapPointers`
 	// ppc64x:-`.*runtime\.makeslice`
 	// ppc64x:-`.*runtime\.panicmakeslicelen`
@@ -69,6 +71,7 @@ func SliceExtensionConstUint64(s []int) []int {
 	// amd64:-`.*runtime\.makeslice`
 	// amd64:-`.*runtime\.panicmakeslicelen`
 	// amd64:"MOVUPS\tX15"
+	// loong64:-`.*runtime\.memclrNoHeapPointers`
 	// ppc64x:-`.*runtime\.memclrNoHeapPointers`
 	// ppc64x:-`.*runtime\.makeslice`
 	// ppc64x:-`.*runtime\.panicmakeslicelen`
@@ -80,16 +83,18 @@ func SliceExtensionConstUint(s []int) []int {
 	// amd64:-`.*runtime\.makeslice`
 	// amd64:-`.*runtime\.panicmakeslicelen`
 	// amd64:"MOVUPS\tX15"
+	// loong64:-`.*runtime\.memclrNoHeapPointers`
 	// ppc64x:-`.*runtime\.memclrNoHeapPointers`
 	// ppc64x:-`.*runtime\.makeslice`
 	// ppc64x:-`.*runtime\.panicmakeslicelen`
 	return append(s, make([]int, uint(1<<2))...)
 }
 
-// On ppc64x continue to use memclrNoHeapPointers
+// On ppc64x and loong64 continue to use memclrNoHeapPointers
 // for sizes >= 512.
 func SliceExtensionConst512(s []int) []int {
 	// amd64:-`.*runtime\.memclrNoHeapPointers`
+	// loong64:`.*runtime\.memclrNoHeapPointers`
 	// ppc64x:`.*runtime\.memclrNoHeapPointers`
 	return append(s, make([]int, 1<<9)...)
 }
diff --git a/test/codegen/spills.go b/test/codegen/spills.go
new file mode 100644
index 00000000..c8ac9859
--- /dev/null
+++ b/test/codegen/spills.go
@@ -0,0 +1,31 @@
+// asmcheck
+
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package codegen
+
+func i64(a, b int64) int64 { // arm64:`STP\s`,`LDP\s`
+	g()
+	return a + b
+}
+
+func i32(a, b int32) int32 { // arm64:`STPW`,`LDPW`
+	g()
+	return a + b
+}
+
+func f64(a, b float64) float64 { // arm64:`FSTPD`,`FLDPD`
+	g()
+	return a + b
+}
+
+func f32(a, b float32) float32 { // arm64:`FSTPS`,`FLDPS`
+	g()
+	return a + b
+}
+
+//go:noinline
+func g() {
+}
diff --git a/test/codegen/strings.go b/test/codegen/strings.go
index f98c062d..64dcf4c8 100644
--- a/test/codegen/strings.go
+++ b/test/codegen/strings.go
@@ -26,6 +26,11 @@ func ToByteSlice() []byte { // Issue #24698
 	return []byte("foo")
 }
 
+func ConvertToByteSlice(a, b, c string) []byte {
+	// amd64:`.*runtime.concatbyte3`
+	return []byte(a + b + c)
+}
+
 // Loading from read-only symbols should get transformed into constants.
 func ConstantLoad() {
 	// 12592 = 0x3130
diff --git a/test/codegen/typeswitch.go b/test/codegen/typeswitch.go
new file mode 100644
index 00000000..93f8e842
--- /dev/null
+++ b/test/codegen/typeswitch.go
@@ -0,0 +1,67 @@
+// asmcheck
+
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package codegen
+
+type Ix interface {
+	X()
+}
+
+type Iy interface {
+	Y()
+}
+
+type Iz interface {
+	Z()
+}
+
+func swXYZ(a Ix) {
+	switch t := a.(type) {
+	case Iy: // amd64:-".*typeAssert"
+		t.Y()
+	case Iz: // amd64:-".*typeAssert"
+		t.Z()
+	}
+}
+
+type Ig[T any] interface {
+	G() T
+}
+
+func swGYZ[T any](a Ig[T]) {
+	switch t := a.(type) {
+	case Iy: // amd64:-".*typeAssert"
+		t.Y()
+	case Iz: // amd64:-".*typeAssert"
+		t.Z()
+	case interface{ G() T }: // amd64:-".*typeAssert",-".*assertE2I\\(",".*assertE2I2"
+		t.G()
+	}
+}
+
+func swE2G[T any](a any) {
+	switch t := a.(type) {
+	case Iy:
+		t.Y()
+	case Ig[T]: // amd64:-".*assertE2I\\(",".*assertE2I2"
+		t.G()
+	}
+}
+
+func swI2G[T any](a Ix) {
+	switch t := a.(type) {
+	case Iy:
+		t.Y()
+	case Ig[T]: // amd64:-".*assertE2I\\(",".*assertE2I2"
+		t.G()
+	}
+}
+
+func swCaller() {
+	swGYZ[int]((Ig[int])(nil))
+	swE2G[int]((Ig[int])(nil))
+	swI2G[int]((Ix)(nil))
+}
diff --git a/test/codegen/unsafe.go b/test/codegen/unsafe.go
new file mode 100644
index 00000000..1f1bdf2a
--- /dev/null
+++ b/test/codegen/unsafe.go
@@ -0,0 +1,16 @@
+// asmcheck
+
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package codegen
+
+import "unsafe"
+
+func f(p unsafe.Pointer, x, y uintptr) int64 {
+	p = unsafe.Pointer(uintptr(p) + x + y)
+	// amd64:`MOVQ\s\(.*\)\(.*\*1\), `
+	// arm64:`MOVD\s\(R[0-9]+\)\(R[0-9]+\), `
+	return *(*int64)(p)
+}
diff --git a/test/codegen/writebarrier.go b/test/codegen/writebarrier.go
index 4e0da144..e2b13993 100644
--- a/test/codegen/writebarrier.go
+++ b/test/codegen/writebarrier.go
@@ -54,6 +54,16 @@ func combine4slice(p *[4][]byte, a, b, c, d []byte) {
 	p[3] = d
 }
 
+func trickyWriteNil(p *int, q **int) {
+	if p == nil {
+		// We change "= p" to "= 0" in the prove pass, which
+		// means we have one less pointer that needs to go
+		// into the write barrier buffer.
+		// amd64:`.*runtime[.]gcWriteBarrier1`
+		*q = p
+	}
+}
+
 type S struct {
 	a, b string
 	c    *int
diff --git a/test/defererrcheck.go b/test/defererrcheck.go
index 95b91da5..c20f090b 100644
--- a/test/defererrcheck.go
+++ b/test/defererrcheck.go
@@ -84,3 +84,57 @@ label:
 		fmt.Println("defer")
 	}()
 }
+
+// Test for function with too many exits, which will disable open-coded defer
+// even though the number of defer statements is not greater than 8.
+func f7() {
+	defer println(1) // ERROR "open-coded defer"
+	defer println(1) // ERROR "open-coded defer"
+	defer println(1) // ERROR "open-coded defer"
+	defer println(1) // ERROR "open-coded defer"
+
+	switch glob {
+	case 1:
+		return
+	case 2:
+		return
+	case 3:
+		return
+	}
+}
+
+func f8() {
+	defer println(1) // ERROR "stack-allocated defer"
+	defer println(1) // ERROR "stack-allocated defer"
+	defer println(1) // ERROR "stack-allocated defer"
+	defer println(1) // ERROR "stack-allocated defer"
+
+	switch glob {
+	case 1:
+		return
+	case 2:
+		return
+	case 3:
+		return
+	case 4:
+		return
+	}
+}
+
+func f9() {
+	defer println(1) // ERROR "open-coded defer"
+	defer println(1) // ERROR "open-coded defer"
+	defer println(1) // ERROR "open-coded defer"
+	defer println(1) // ERROR "open-coded defer"
+
+	switch glob {
+	case 1:
+		return
+	case 2:
+		return
+	case 3:
+		return
+	case 4:
+		panic("")
+	}
+}
diff --git a/test/escape4.go b/test/escape4.go
index c4a2fc15..ddeaff81 100644
--- a/test/escape4.go
+++ b/test/escape4.go
@@ -25,7 +25,7 @@ func f1() {
 	// Escape analysis used to miss inlined code in closures.
 
 	func() { // ERROR "can inline f1.func1"
-		p = alloc(3) // ERROR "inlining call to alloc"
+		p = alloc(3) // ERROR "inlining call to alloc" "moved to heap: x"
 	}() // ERROR "inlining call to f1.func1" "inlining call to alloc" "moved to heap: x"
 
 	f = func() { // ERROR "func literal escapes to heap" "can inline f1.func2"
diff --git a/test/escape_closure.go b/test/escape_closure.go
index 0b19d6f6..84f3adf3 100644
--- a/test/escape_closure.go
+++ b/test/escape_closure.go
@@ -134,7 +134,7 @@ func ClosureCallArgs14() {
 func ClosureCallArgs15() {
 	x := 0 // ERROR "moved to heap: x"
 	p := &x
-	sink = func(p **int) *int { // ERROR "leaking param content: p" "func literal does not escape"
+	sink = func(p **int) *int { // ERROR "leaking param: p to result ~r0 level=1" "func literal does not escape"
 		return *p
 	}(&p)
 }
diff --git a/test/escape_reflect.go b/test/escape_reflect.go
index 99fbada9..e5032370 100644
--- a/test/escape_reflect.go
+++ b/test/escape_reflect.go
@@ -423,7 +423,7 @@ func mapdelete(m map[string]string, k string) { // ERROR "m does not escape" "le
 }
 
 // Unfortunate: v doesn't need to leak.
-func setiterkey1(v reflect.Value, it *reflect.MapIter) { // ERROR "leaking param: v$" "it does not escape"
+func setiterkey1(v reflect.Value, it *reflect.MapIter) { // ERROR "leaking param: v$" "leaking param content: it$"
 	v.SetIterKey(it)
 }
 
@@ -434,7 +434,7 @@ func setiterkey2(v reflect.Value, m map[string]string) { // ERROR "leaking param
 }
 
 // Unfortunate: v doesn't need to leak.
-func setitervalue1(v reflect.Value, it *reflect.MapIter) { // ERROR "leaking param: v$" "it does not escape"
+func setitervalue1(v reflect.Value, it *reflect.MapIter) { // ERROR "leaking param: v$" "leaking param content: it$"
 	v.SetIterValue(it)
 }
 
diff --git a/test/fixedbugs/bug195.go b/test/fixedbugs/bug195.go
index 769ed050..fa9cec75 100644
--- a/test/fixedbugs/bug195.go
+++ b/test/fixedbugs/bug195.go
@@ -18,7 +18,7 @@ type I4 interface { // GC_ERROR "invalid recursive type: I4 refers to itself"
 	I4 // GCCGO_ERROR "interface"
 }
 
-type I5 interface { // GC_ERROR "invalid recursive type I5\n\tLINE:.* I5 refers to\n\tLINE+4:.* I6 refers to\n\tLINE:.* I5$"
+type I5 interface { // GC_ERROR "invalid recursive type I5\n\tLINE:.* I5 refers to I6\n\tLINE+4:.* I6 refers to I5$"
 	I6
 }
 
diff --git a/test/fixedbugs/bug385_64.go b/test/fixedbugs/bug385_64.go
index deba9c9f..49201d95 100644
--- a/test/fixedbugs/bug385_64.go
+++ b/test/fixedbugs/bug385_64.go
@@ -11,423 +11,49449 @@
 
 package main
 
-var z [10 << 20]byte
+// seq 1 16480 | sed 's/.*/var z& [1 << 17]byte/'
+var z1 [1 << 17]byte
+var z2 [1 << 17]byte
+var z3 [1 << 17]byte
+var z4 [1 << 17]byte
+var z5 [1 << 17]byte
+var z6 [1 << 17]byte
+var z7 [1 << 17]byte
+var z8 [1 << 17]byte
+var z9 [1 << 17]byte
+var z10 [1 << 17]byte
+var z11 [1 << 17]byte
+var z12 [1 << 17]byte
+var z13 [1 << 17]byte
+var z14 [1 << 17]byte
+var z15 [1 << 17]byte
+var z16 [1 << 17]byte
+var z17 [1 << 17]byte
+var z18 [1 << 17]byte
+var z19 [1 << 17]byte
+var z20 [1 << 17]byte
+var z21 [1 << 17]byte
+var z22 [1 << 17]byte
+var z23 [1 << 17]byte
+var z24 [1 << 17]byte
+var z25 [1 << 17]byte
+var z26 [1 << 17]byte
+var z27 [1 << 17]byte
+var z28 [1 << 17]byte
+var z29 [1 << 17]byte
+var z30 [1 << 17]byte
+var z31 [1 << 17]byte
+var z32 [1 << 17]byte
+var z33 [1 << 17]byte
+var z34 [1 << 17]byte
+var z35 [1 << 17]byte
+var z36 [1 << 17]byte
+var z37 [1 << 17]byte
+var z38 [1 << 17]byte
+var z39 [1 << 17]byte
+var z40 [1 << 17]byte
+var z41 [1 << 17]byte
+var z42 [1 << 17]byte
+var z43 [1 << 17]byte
+var z44 [1 << 17]byte
+var z45 [1 << 17]byte
+var z46 [1 << 17]byte
+var z47 [1 << 17]byte
+var z48 [1 << 17]byte
+var z49 [1 << 17]byte
+var z50 [1 << 17]byte
+var z51 [1 << 17]byte
+var z52 [1 << 17]byte
+var z53 [1 << 17]byte
+var z54 [1 << 17]byte
+var z55 [1 << 17]byte
+var z56 [1 << 17]byte
+var z57 [1 << 17]byte
+var z58 [1 << 17]byte
+var z59 [1 << 17]byte
+var z60 [1 << 17]byte
+var z61 [1 << 17]byte
+var z62 [1 << 17]byte
+var z63 [1 << 17]byte
+var z64 [1 << 17]byte
+var z65 [1 << 17]byte
+var z66 [1 << 17]byte
+var z67 [1 << 17]byte
+var z68 [1 << 17]byte
+var z69 [1 << 17]byte
+var z70 [1 << 17]byte
+var z71 [1 << 17]byte
+var z72 [1 << 17]byte
+var z73 [1 << 17]byte
+var z74 [1 << 17]byte
+var z75 [1 << 17]byte
+var z76 [1 << 17]byte
+var z77 [1 << 17]byte
+var z78 [1 << 17]byte
+var z79 [1 << 17]byte
+var z80 [1 << 17]byte
+var z81 [1 << 17]byte
+var z82 [1 << 17]byte
+var z83 [1 << 17]byte
+var z84 [1 << 17]byte
+var z85 [1 << 17]byte
+var z86 [1 << 17]byte
+var z87 [1 << 17]byte
+var z88 [1 << 17]byte
+var z89 [1 << 17]byte
+var z90 [1 << 17]byte
+var z91 [1 << 17]byte
+var z92 [1 << 17]byte
+var z93 [1 << 17]byte
+var z94 [1 << 17]byte
+var z95 [1 << 17]byte
+var z96 [1 << 17]byte
+var z97 [1 << 17]byte
+var z98 [1 << 17]byte
+var z99 [1 << 17]byte
+var z100 [1 << 17]byte
+var z101 [1 << 17]byte
+var z102 [1 << 17]byte
+var z103 [1 << 17]byte
+var z104 [1 << 17]byte
+var z105 [1 << 17]byte
+var z106 [1 << 17]byte
+var z107 [1 << 17]byte
+var z108 [1 << 17]byte
+var z109 [1 << 17]byte
+var z110 [1 << 17]byte
+var z111 [1 << 17]byte
+var z112 [1 << 17]byte
+var z113 [1 << 17]byte
+var z114 [1 << 17]byte
+var z115 [1 << 17]byte
+var z116 [1 << 17]byte
+var z117 [1 << 17]byte
+var z118 [1 << 17]byte
+var z119 [1 << 17]byte
+var z120 [1 << 17]byte
+var z121 [1 << 17]byte
+var z122 [1 << 17]byte
+var z123 [1 << 17]byte
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+var z16456 [1 << 17]byte
+var z16457 [1 << 17]byte
+var z16458 [1 << 17]byte
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+var z16460 [1 << 17]byte
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+var z16467 [1 << 17]byte
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+var z16469 [1 << 17]byte
+var z16470 [1 << 17]byte
+var z16471 [1 << 17]byte
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+var z16473 [1 << 17]byte
+var z16474 [1 << 17]byte
+var z16475 [1 << 17]byte
+var z16476 [1 << 17]byte
+var z16477 [1 << 17]byte
+var z16478 [1 << 17]byte
+var z16479 [1 << 17]byte
+var z16480 [1 << 17]byte
 
 func main() { // GC_ERROR "stack frame too large"
-	// seq 1 206 | sed 's/.*/	var x& [10<<20]byte/'
-	// seq 1 206 | sed 's/.*/	z = x&/'
-	var x1 [10<<20]byte
-	var x2 [10<<20]byte
-	var x3 [10<<20]byte
-	var x4 [10<<20]byte
-	var x5 [10<<20]byte
-	var x6 [10<<20]byte
-	var x7 [10<<20]byte
-	var x8 [10<<20]byte
-	var x9 [10<<20]byte
-	var x10 [10<<20]byte
-	var x11 [10<<20]byte
-	var x12 [10<<20]byte
-	var x13 [10<<20]byte
-	var x14 [10<<20]byte
-	var x15 [10<<20]byte
-	var x16 [10<<20]byte
-	var x17 [10<<20]byte
-	var x18 [10<<20]byte
-	var x19 [10<<20]byte
-	var x20 [10<<20]byte
-	var x21 [10<<20]byte
-	var x22 [10<<20]byte
-	var x23 [10<<20]byte
-	var x24 [10<<20]byte
-	var x25 [10<<20]byte
-	var x26 [10<<20]byte
-	var x27 [10<<20]byte
-	var x28 [10<<20]byte
-	var x29 [10<<20]byte
-	var x30 [10<<20]byte
-	var x31 [10<<20]byte
-	var x32 [10<<20]byte
-	var x33 [10<<20]byte
-	var x34 [10<<20]byte
-	var x35 [10<<20]byte
-	var x36 [10<<20]byte
-	var x37 [10<<20]byte
-	var x38 [10<<20]byte
-	var x39 [10<<20]byte
-	var x40 [10<<20]byte
-	var x41 [10<<20]byte
-	var x42 [10<<20]byte
-	var x43 [10<<20]byte
-	var x44 [10<<20]byte
-	var x45 [10<<20]byte
-	var x46 [10<<20]byte
-	var x47 [10<<20]byte
-	var x48 [10<<20]byte
-	var x49 [10<<20]byte
-	var x50 [10<<20]byte
-	var x51 [10<<20]byte
-	var x52 [10<<20]byte
-	var x53 [10<<20]byte
-	var x54 [10<<20]byte
-	var x55 [10<<20]byte
-	var x56 [10<<20]byte
-	var x57 [10<<20]byte
-	var x58 [10<<20]byte
-	var x59 [10<<20]byte
-	var x60 [10<<20]byte
-	var x61 [10<<20]byte
-	var x62 [10<<20]byte
-	var x63 [10<<20]byte
-	var x64 [10<<20]byte
-	var x65 [10<<20]byte
-	var x66 [10<<20]byte
-	var x67 [10<<20]byte
-	var x68 [10<<20]byte
-	var x69 [10<<20]byte
-	var x70 [10<<20]byte
-	var x71 [10<<20]byte
-	var x72 [10<<20]byte
-	var x73 [10<<20]byte
-	var x74 [10<<20]byte
-	var x75 [10<<20]byte
-	var x76 [10<<20]byte
-	var x77 [10<<20]byte
-	var x78 [10<<20]byte
-	var x79 [10<<20]byte
-	var x80 [10<<20]byte
-	var x81 [10<<20]byte
-	var x82 [10<<20]byte
-	var x83 [10<<20]byte
-	var x84 [10<<20]byte
-	var x85 [10<<20]byte
-	var x86 [10<<20]byte
-	var x87 [10<<20]byte
-	var x88 [10<<20]byte
-	var x89 [10<<20]byte
-	var x90 [10<<20]byte
-	var x91 [10<<20]byte
-	var x92 [10<<20]byte
-	var x93 [10<<20]byte
-	var x94 [10<<20]byte
-	var x95 [10<<20]byte
-	var x96 [10<<20]byte
-	var x97 [10<<20]byte
-	var x98 [10<<20]byte
-	var x99 [10<<20]byte
-	var x100 [10<<20]byte
-	var x101 [10<<20]byte
-	var x102 [10<<20]byte
-	var x103 [10<<20]byte
-	var x104 [10<<20]byte
-	var x105 [10<<20]byte
-	var x106 [10<<20]byte
-	var x107 [10<<20]byte
-	var x108 [10<<20]byte
-	var x109 [10<<20]byte
-	var x110 [10<<20]byte
-	var x111 [10<<20]byte
-	var x112 [10<<20]byte
-	var x113 [10<<20]byte
-	var x114 [10<<20]byte
-	var x115 [10<<20]byte
-	var x116 [10<<20]byte
-	var x117 [10<<20]byte
-	var x118 [10<<20]byte
-	var x119 [10<<20]byte
-	var x120 [10<<20]byte
-	var x121 [10<<20]byte
-	var x122 [10<<20]byte
-	var x123 [10<<20]byte
-	var x124 [10<<20]byte
-	var x125 [10<<20]byte
-	var x126 [10<<20]byte
-	var x127 [10<<20]byte
-	var x128 [10<<20]byte
-	var x129 [10<<20]byte
-	var x130 [10<<20]byte
-	var x131 [10<<20]byte
-	var x132 [10<<20]byte
-	var x133 [10<<20]byte
-	var x134 [10<<20]byte
-	var x135 [10<<20]byte
-	var x136 [10<<20]byte
-	var x137 [10<<20]byte
-	var x138 [10<<20]byte
-	var x139 [10<<20]byte
-	var x140 [10<<20]byte
-	var x141 [10<<20]byte
-	var x142 [10<<20]byte
-	var x143 [10<<20]byte
-	var x144 [10<<20]byte
-	var x145 [10<<20]byte
-	var x146 [10<<20]byte
-	var x147 [10<<20]byte
-	var x148 [10<<20]byte
-	var x149 [10<<20]byte
-	var x150 [10<<20]byte
-	var x151 [10<<20]byte
-	var x152 [10<<20]byte
-	var x153 [10<<20]byte
-	var x154 [10<<20]byte
-	var x155 [10<<20]byte
-	var x156 [10<<20]byte
-	var x157 [10<<20]byte
-	var x158 [10<<20]byte
-	var x159 [10<<20]byte
-	var x160 [10<<20]byte
-	var x161 [10<<20]byte
-	var x162 [10<<20]byte
-	var x163 [10<<20]byte
-	var x164 [10<<20]byte
-	var x165 [10<<20]byte
-	var x166 [10<<20]byte
-	var x167 [10<<20]byte
-	var x168 [10<<20]byte
-	var x169 [10<<20]byte
-	var x170 [10<<20]byte
-	var x171 [10<<20]byte
-	var x172 [10<<20]byte
-	var x173 [10<<20]byte
-	var x174 [10<<20]byte
-	var x175 [10<<20]byte
-	var x176 [10<<20]byte
-	var x177 [10<<20]byte
-	var x178 [10<<20]byte
-	var x179 [10<<20]byte
-	var x180 [10<<20]byte
-	var x181 [10<<20]byte
-	var x182 [10<<20]byte
-	var x183 [10<<20]byte
-	var x184 [10<<20]byte
-	var x185 [10<<20]byte
-	var x186 [10<<20]byte
-	var x187 [10<<20]byte
-	var x188 [10<<20]byte
-	var x189 [10<<20]byte
-	var x190 [10<<20]byte
-	var x191 [10<<20]byte
-	var x192 [10<<20]byte
-	var x193 [10<<20]byte
-	var x194 [10<<20]byte
-	var x195 [10<<20]byte
-	var x196 [10<<20]byte
-	var x197 [10<<20]byte
-	var x198 [10<<20]byte
-	var x199 [10<<20]byte
-	var x200 [10<<20]byte
-	var x201 [10<<20]byte
-	var x202 [10<<20]byte
-	var x203 [10<<20]byte
-	var x204 [10<<20]byte
-	var x205 [10<<20]byte
-	var x206 [10<<20]byte
-	var x207 [10<<20]byte
-	z = x1
-	z = x2
-	z = x3
-	z = x4
-	z = x5
-	z = x6
-	z = x7
-	z = x8
-	z = x9
-	z = x10
-	z = x11
-	z = x12
-	z = x13
-	z = x14
-	z = x15
-	z = x16
-	z = x17
-	z = x18
-	z = x19
-	z = x20
-	z = x21
-	z = x22
-	z = x23
-	z = x24
-	z = x25
-	z = x26
-	z = x27
-	z = x28
-	z = x29
-	z = x30
-	z = x31
-	z = x32
-	z = x33
-	z = x34
-	z = x35
-	z = x36
-	z = x37
-	z = x38
-	z = x39
-	z = x40
-	z = x41
-	z = x42
-	z = x43
-	z = x44
-	z = x45
-	z = x46
-	z = x47
-	z = x48
-	z = x49
-	z = x50
-	z = x51
-	z = x52
-	z = x53
-	z = x54
-	z = x55
-	z = x56
-	z = x57
-	z = x58
-	z = x59
-	z = x60
-	z = x61
-	z = x62
-	z = x63
-	z = x64
-	z = x65
-	z = x66
-	z = x67
-	z = x68
-	z = x69
-	z = x70
-	z = x71
-	z = x72
-	z = x73
-	z = x74
-	z = x75
-	z = x76
-	z = x77
-	z = x78
-	z = x79
-	z = x80
-	z = x81
-	z = x82
-	z = x83
-	z = x84
-	z = x85
-	z = x86
-	z = x87
-	z = x88
-	z = x89
-	z = x90
-	z = x91
-	z = x92
-	z = x93
-	z = x94
-	z = x95
-	z = x96
-	z = x97
-	z = x98
-	z = x99
-	z = x100
-	z = x101
-	z = x102
-	z = x103
-	z = x104
-	z = x105
-	z = x106
-	z = x107
-	z = x108
-	z = x109
-	z = x110
-	z = x111
-	z = x112
-	z = x113
-	z = x114
-	z = x115
-	z = x116
-	z = x117
-	z = x118
-	z = x119
-	z = x120
-	z = x121
-	z = x122
-	z = x123
-	z = x124
-	z = x125
-	z = x126
-	z = x127
-	z = x128
-	z = x129
-	z = x130
-	z = x131
-	z = x132
-	z = x133
-	z = x134
-	z = x135
-	z = x136
-	z = x137
-	z = x138
-	z = x139
-	z = x140
-	z = x141
-	z = x142
-	z = x143
-	z = x144
-	z = x145
-	z = x146
-	z = x147
-	z = x148
-	z = x149
-	z = x150
-	z = x151
-	z = x152
-	z = x153
-	z = x154
-	z = x155
-	z = x156
-	z = x157
-	z = x158
-	z = x159
-	z = x160
-	z = x161
-	z = x162
-	z = x163
-	z = x164
-	z = x165
-	z = x166
-	z = x167
-	z = x168
-	z = x169
-	z = x170
-	z = x171
-	z = x172
-	z = x173
-	z = x174
-	z = x175
-	z = x176
-	z = x177
-	z = x178
-	z = x179
-	z = x180
-	z = x181
-	z = x182
-	z = x183
-	z = x184
-	z = x185
-	z = x186
-	z = x187
-	z = x188
-	z = x189
-	z = x190
-	z = x191
-	z = x192
-	z = x193
-	z = x194
-	z = x195
-	z = x196
-	z = x197
-	z = x198
-	z = x199
-	z = x200
-	z = x201
-	z = x202
-	z = x203
-	z = x204
-	z = x205
-	z = x206
-	z = x207
+	// seq 1 16480 | sed 's/.*/	var x& [1 << 17]byte/'
+	// seq 1 16480 | sed 's/.*/	z& = x&/'
+	var x1 [1 << 17]byte
+	var x2 [1 << 17]byte
+	var x3 [1 << 17]byte
+	var x4 [1 << 17]byte
+	var x5 [1 << 17]byte
+	var x6 [1 << 17]byte
+	var x7 [1 << 17]byte
+	var x8 [1 << 17]byte
+	var x9 [1 << 17]byte
+	var x10 [1 << 17]byte
+	var x11 [1 << 17]byte
+	var x12 [1 << 17]byte
+	var x13 [1 << 17]byte
+	var x14 [1 << 17]byte
+	var x15 [1 << 17]byte
+	var x16 [1 << 17]byte
+	var x17 [1 << 17]byte
+	var x18 [1 << 17]byte
+	var x19 [1 << 17]byte
+	var x20 [1 << 17]byte
+	var x21 [1 << 17]byte
+	var x22 [1 << 17]byte
+	var x23 [1 << 17]byte
+	var x24 [1 << 17]byte
+	var x25 [1 << 17]byte
+	var x26 [1 << 17]byte
+	var x27 [1 << 17]byte
+	var x28 [1 << 17]byte
+	var x29 [1 << 17]byte
+	var x30 [1 << 17]byte
+	var x31 [1 << 17]byte
+	var x32 [1 << 17]byte
+	var x33 [1 << 17]byte
+	var x34 [1 << 17]byte
+	var x35 [1 << 17]byte
+	var x36 [1 << 17]byte
+	var x37 [1 << 17]byte
+	var x38 [1 << 17]byte
+	var x39 [1 << 17]byte
+	var x40 [1 << 17]byte
+	var x41 [1 << 17]byte
+	var x42 [1 << 17]byte
+	var x43 [1 << 17]byte
+	var x44 [1 << 17]byte
+	var x45 [1 << 17]byte
+	var x46 [1 << 17]byte
+	var x47 [1 << 17]byte
+	var x48 [1 << 17]byte
+	var x49 [1 << 17]byte
+	var x50 [1 << 17]byte
+	var x51 [1 << 17]byte
+	var x52 [1 << 17]byte
+	var x53 [1 << 17]byte
+	var x54 [1 << 17]byte
+	var x55 [1 << 17]byte
+	var x56 [1 << 17]byte
+	var x57 [1 << 17]byte
+	var x58 [1 << 17]byte
+	var x59 [1 << 17]byte
+	var x60 [1 << 17]byte
+	var x61 [1 << 17]byte
+	var x62 [1 << 17]byte
+	var x63 [1 << 17]byte
+	var x64 [1 << 17]byte
+	var x65 [1 << 17]byte
+	var x66 [1 << 17]byte
+	var x67 [1 << 17]byte
+	var x68 [1 << 17]byte
+	var x69 [1 << 17]byte
+	var x70 [1 << 17]byte
+	var x71 [1 << 17]byte
+	var x72 [1 << 17]byte
+	var x73 [1 << 17]byte
+	var x74 [1 << 17]byte
+	var x75 [1 << 17]byte
+	var x76 [1 << 17]byte
+	var x77 [1 << 17]byte
+	var x78 [1 << 17]byte
+	var x79 [1 << 17]byte
+	var x80 [1 << 17]byte
+	var x81 [1 << 17]byte
+	var x82 [1 << 17]byte
+	var x83 [1 << 17]byte
+	var x84 [1 << 17]byte
+	var x85 [1 << 17]byte
+	var x86 [1 << 17]byte
+	var x87 [1 << 17]byte
+	var x88 [1 << 17]byte
+	var x89 [1 << 17]byte
+	var x90 [1 << 17]byte
+	var x91 [1 << 17]byte
+	var x92 [1 << 17]byte
+	var x93 [1 << 17]byte
+	var x94 [1 << 17]byte
+	var x95 [1 << 17]byte
+	var x96 [1 << 17]byte
+	var x97 [1 << 17]byte
+	var x98 [1 << 17]byte
+	var x99 [1 << 17]byte
+	var x100 [1 << 17]byte
+	var x101 [1 << 17]byte
+	var x102 [1 << 17]byte
+	var x103 [1 << 17]byte
+	var x104 [1 << 17]byte
+	var x105 [1 << 17]byte
+	var x106 [1 << 17]byte
+	var x107 [1 << 17]byte
+	var x108 [1 << 17]byte
+	var x109 [1 << 17]byte
+	var x110 [1 << 17]byte
+	var x111 [1 << 17]byte
+	var x112 [1 << 17]byte
+	var x113 [1 << 17]byte
+	var x114 [1 << 17]byte
+	var x115 [1 << 17]byte
+	var x116 [1 << 17]byte
+	var x117 [1 << 17]byte
+	var x118 [1 << 17]byte
+	var x119 [1 << 17]byte
+	var x120 [1 << 17]byte
+	var x121 [1 << 17]byte
+	var x122 [1 << 17]byte
+	var x123 [1 << 17]byte
+	var x124 [1 << 17]byte
+	var x125 [1 << 17]byte
+	var x126 [1 << 17]byte
+	var x127 [1 << 17]byte
+	var x128 [1 << 17]byte
+	var x129 [1 << 17]byte
+	var x130 [1 << 17]byte
+	var x131 [1 << 17]byte
+	var x132 [1 << 17]byte
+	var x133 [1 << 17]byte
+	var x134 [1 << 17]byte
+	var x135 [1 << 17]byte
+	var x136 [1 << 17]byte
+	var x137 [1 << 17]byte
+	var x138 [1 << 17]byte
+	var x139 [1 << 17]byte
+	var x140 [1 << 17]byte
+	var x141 [1 << 17]byte
+	var x142 [1 << 17]byte
+	var x143 [1 << 17]byte
+	var x144 [1 << 17]byte
+	var x145 [1 << 17]byte
+	var x146 [1 << 17]byte
+	var x147 [1 << 17]byte
+	var x148 [1 << 17]byte
+	var x149 [1 << 17]byte
+	var x150 [1 << 17]byte
+	var x151 [1 << 17]byte
+	var x152 [1 << 17]byte
+	var x153 [1 << 17]byte
+	var x154 [1 << 17]byte
+	var x155 [1 << 17]byte
+	var x156 [1 << 17]byte
+	var x157 [1 << 17]byte
+	var x158 [1 << 17]byte
+	var x159 [1 << 17]byte
+	var x160 [1 << 17]byte
+	var x161 [1 << 17]byte
+	var x162 [1 << 17]byte
+	var x163 [1 << 17]byte
+	var x164 [1 << 17]byte
+	var x165 [1 << 17]byte
+	var x166 [1 << 17]byte
+	var x167 [1 << 17]byte
+	var x168 [1 << 17]byte
+	var x169 [1 << 17]byte
+	var x170 [1 << 17]byte
+	var x171 [1 << 17]byte
+	var x172 [1 << 17]byte
+	var x173 [1 << 17]byte
+	var x174 [1 << 17]byte
+	var x175 [1 << 17]byte
+	var x176 [1 << 17]byte
+	var x177 [1 << 17]byte
+	var x178 [1 << 17]byte
+	var x179 [1 << 17]byte
+	var x180 [1 << 17]byte
+	var x181 [1 << 17]byte
+	var x182 [1 << 17]byte
+	var x183 [1 << 17]byte
+	var x184 [1 << 17]byte
+	var x185 [1 << 17]byte
+	var x186 [1 << 17]byte
+	var x187 [1 << 17]byte
+	var x188 [1 << 17]byte
+	var x189 [1 << 17]byte
+	var x190 [1 << 17]byte
+	var x191 [1 << 17]byte
+	var x192 [1 << 17]byte
+	var x193 [1 << 17]byte
+	var x194 [1 << 17]byte
+	var x195 [1 << 17]byte
+	var x196 [1 << 17]byte
+	var x197 [1 << 17]byte
+	var x198 [1 << 17]byte
+	var x199 [1 << 17]byte
+	var x200 [1 << 17]byte
+	var x201 [1 << 17]byte
+	var x202 [1 << 17]byte
+	var x203 [1 << 17]byte
+	var x204 [1 << 17]byte
+	var x205 [1 << 17]byte
+	var x206 [1 << 17]byte
+	var x207 [1 << 17]byte
+	var x208 [1 << 17]byte
+	var x209 [1 << 17]byte
+	var x210 [1 << 17]byte
+	var x211 [1 << 17]byte
+	var x212 [1 << 17]byte
+	var x213 [1 << 17]byte
+	var x214 [1 << 17]byte
+	var x215 [1 << 17]byte
+	var x216 [1 << 17]byte
+	var x217 [1 << 17]byte
+	var x218 [1 << 17]byte
+	var x219 [1 << 17]byte
+	var x220 [1 << 17]byte
+	var x221 [1 << 17]byte
+	var x222 [1 << 17]byte
+	var x223 [1 << 17]byte
+	var x224 [1 << 17]byte
+	var x225 [1 << 17]byte
+	var x226 [1 << 17]byte
+	var x227 [1 << 17]byte
+	var x228 [1 << 17]byte
+	var x229 [1 << 17]byte
+	var x230 [1 << 17]byte
+	var x231 [1 << 17]byte
+	var x232 [1 << 17]byte
+	var x233 [1 << 17]byte
+	var x234 [1 << 17]byte
+	var x235 [1 << 17]byte
+	var x236 [1 << 17]byte
+	var x237 [1 << 17]byte
+	var x238 [1 << 17]byte
+	var x239 [1 << 17]byte
+	var x240 [1 << 17]byte
+	var x241 [1 << 17]byte
+	var x242 [1 << 17]byte
+	var x243 [1 << 17]byte
+	var x244 [1 << 17]byte
+	var x245 [1 << 17]byte
+	var x246 [1 << 17]byte
+	var x247 [1 << 17]byte
+	var x248 [1 << 17]byte
+	var x249 [1 << 17]byte
+	var x250 [1 << 17]byte
+	var x251 [1 << 17]byte
+	var x252 [1 << 17]byte
+	var x253 [1 << 17]byte
+	var x254 [1 << 17]byte
+	var x255 [1 << 17]byte
+	var x256 [1 << 17]byte
+	var x257 [1 << 17]byte
+	var x258 [1 << 17]byte
+	var x259 [1 << 17]byte
+	var x260 [1 << 17]byte
+	var x261 [1 << 17]byte
+	var x262 [1 << 17]byte
+	var x263 [1 << 17]byte
+	var x264 [1 << 17]byte
+	var x265 [1 << 17]byte
+	var x266 [1 << 17]byte
+	var x267 [1 << 17]byte
+	var x268 [1 << 17]byte
+	var x269 [1 << 17]byte
+	var x270 [1 << 17]byte
+	var x271 [1 << 17]byte
+	var x272 [1 << 17]byte
+	var x273 [1 << 17]byte
+	var x274 [1 << 17]byte
+	var x275 [1 << 17]byte
+	var x276 [1 << 17]byte
+	var x277 [1 << 17]byte
+	var x278 [1 << 17]byte
+	var x279 [1 << 17]byte
+	var x280 [1 << 17]byte
+	var x281 [1 << 17]byte
+	var x282 [1 << 17]byte
+	var x283 [1 << 17]byte
+	var x284 [1 << 17]byte
+	var x285 [1 << 17]byte
+	var x286 [1 << 17]byte
+	var x287 [1 << 17]byte
+	var x288 [1 << 17]byte
+	var x289 [1 << 17]byte
+	var x290 [1 << 17]byte
+	var x291 [1 << 17]byte
+	var x292 [1 << 17]byte
+	var x293 [1 << 17]byte
+	var x294 [1 << 17]byte
+	var x295 [1 << 17]byte
+	var x296 [1 << 17]byte
+	var x297 [1 << 17]byte
+	var x298 [1 << 17]byte
+	var x299 [1 << 17]byte
+	var x300 [1 << 17]byte
+	var x301 [1 << 17]byte
+	var x302 [1 << 17]byte
+	var x303 [1 << 17]byte
+	var x304 [1 << 17]byte
+	var x305 [1 << 17]byte
+	var x306 [1 << 17]byte
+	var x307 [1 << 17]byte
+	var x308 [1 << 17]byte
+	var x309 [1 << 17]byte
+	var x310 [1 << 17]byte
+	var x311 [1 << 17]byte
+	var x312 [1 << 17]byte
+	var x313 [1 << 17]byte
+	var x314 [1 << 17]byte
+	var x315 [1 << 17]byte
+	var x316 [1 << 17]byte
+	var x317 [1 << 17]byte
+	var x318 [1 << 17]byte
+	var x319 [1 << 17]byte
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+	z1171 = x1171
+	z1172 = x1172
+	z1173 = x1173
+	z1174 = x1174
+	z1175 = x1175
+	z1176 = x1176
+	z1177 = x1177
+	z1178 = x1178
+	z1179 = x1179
+	z1180 = x1180
+	z1181 = x1181
+	z1182 = x1182
+	z1183 = x1183
+	z1184 = x1184
+	z1185 = x1185
+	z1186 = x1186
+	z1187 = x1187
+	z1188 = x1188
+	z1189 = x1189
+	z1190 = x1190
+	z1191 = x1191
+	z1192 = x1192
+	z1193 = x1193
+	z1194 = x1194
+	z1195 = x1195
+	z1196 = x1196
+	z1197 = x1197
+	z1198 = x1198
+	z1199 = x1199
+	z1200 = x1200
+	z1201 = x1201
+	z1202 = x1202
+	z1203 = x1203
+	z1204 = x1204
+	z1205 = x1205
+	z1206 = x1206
+	z1207 = x1207
+	z1208 = x1208
+	z1209 = x1209
+	z1210 = x1210
+	z1211 = x1211
+	z1212 = x1212
+	z1213 = x1213
+	z1214 = x1214
+	z1215 = x1215
+	z1216 = x1216
+	z1217 = x1217
+	z1218 = x1218
+	z1219 = x1219
+	z1220 = x1220
+	z1221 = x1221
+	z1222 = x1222
+	z1223 = x1223
+	z1224 = x1224
+	z1225 = x1225
+	z1226 = x1226
+	z1227 = x1227
+	z1228 = x1228
+	z1229 = x1229
+	z1230 = x1230
+	z1231 = x1231
+	z1232 = x1232
+	z1233 = x1233
+	z1234 = x1234
+	z1235 = x1235
+	z1236 = x1236
+	z1237 = x1237
+	z1238 = x1238
+	z1239 = x1239
+	z1240 = x1240
+	z1241 = x1241
+	z1242 = x1242
+	z1243 = x1243
+	z1244 = x1244
+	z1245 = x1245
+	z1246 = x1246
+	z1247 = x1247
+	z1248 = x1248
+	z1249 = x1249
+	z1250 = x1250
+	z1251 = x1251
+	z1252 = x1252
+	z1253 = x1253
+	z1254 = x1254
+	z1255 = x1255
+	z1256 = x1256
+	z1257 = x1257
+	z1258 = x1258
+	z1259 = x1259
+	z1260 = x1260
+	z1261 = x1261
+	z1262 = x1262
+	z1263 = x1263
+	z1264 = x1264
+	z1265 = x1265
+	z1266 = x1266
+	z1267 = x1267
+	z1268 = x1268
+	z1269 = x1269
+	z1270 = x1270
+	z1271 = x1271
+	z1272 = x1272
+	z1273 = x1273
+	z1274 = x1274
+	z1275 = x1275
+	z1276 = x1276
+	z1277 = x1277
+	z1278 = x1278
+	z1279 = x1279
+	z1280 = x1280
+	z1281 = x1281
+	z1282 = x1282
+	z1283 = x1283
+	z1284 = x1284
+	z1285 = x1285
+	z1286 = x1286
+	z1287 = x1287
+	z1288 = x1288
+	z1289 = x1289
+	z1290 = x1290
+	z1291 = x1291
+	z1292 = x1292
+	z1293 = x1293
+	z1294 = x1294
+	z1295 = x1295
+	z1296 = x1296
+	z1297 = x1297
+	z1298 = x1298
+	z1299 = x1299
+	z1300 = x1300
+	z1301 = x1301
+	z1302 = x1302
+	z1303 = x1303
+	z1304 = x1304
+	z1305 = x1305
+	z1306 = x1306
+	z1307 = x1307
+	z1308 = x1308
+	z1309 = x1309
+	z1310 = x1310
+	z1311 = x1311
+	z1312 = x1312
+	z1313 = x1313
+	z1314 = x1314
+	z1315 = x1315
+	z1316 = x1316
+	z1317 = x1317
+	z1318 = x1318
+	z1319 = x1319
+	z1320 = x1320
+	z1321 = x1321
+	z1322 = x1322
+	z1323 = x1323
+	z1324 = x1324
+	z1325 = x1325
+	z1326 = x1326
+	z1327 = x1327
+	z1328 = x1328
+	z1329 = x1329
+	z1330 = x1330
+	z1331 = x1331
+	z1332 = x1332
+	z1333 = x1333
+	z1334 = x1334
+	z1335 = x1335
+	z1336 = x1336
+	z1337 = x1337
+	z1338 = x1338
+	z1339 = x1339
+	z1340 = x1340
+	z1341 = x1341
+	z1342 = x1342
+	z1343 = x1343
+	z1344 = x1344
+	z1345 = x1345
+	z1346 = x1346
+	z1347 = x1347
+	z1348 = x1348
+	z1349 = x1349
+	z1350 = x1350
+	z1351 = x1351
+	z1352 = x1352
+	z1353 = x1353
+	z1354 = x1354
+	z1355 = x1355
+	z1356 = x1356
+	z1357 = x1357
+	z1358 = x1358
+	z1359 = x1359
+	z1360 = x1360
+	z1361 = x1361
+	z1362 = x1362
+	z1363 = x1363
+	z1364 = x1364
+	z1365 = x1365
+	z1366 = x1366
+	z1367 = x1367
+	z1368 = x1368
+	z1369 = x1369
+	z1370 = x1370
+	z1371 = x1371
+	z1372 = x1372
+	z1373 = x1373
+	z1374 = x1374
+	z1375 = x1375
+	z1376 = x1376
+	z1377 = x1377
+	z1378 = x1378
+	z1379 = x1379
+	z1380 = x1380
+	z1381 = x1381
+	z1382 = x1382
+	z1383 = x1383
+	z1384 = x1384
+	z1385 = x1385
+	z1386 = x1386
+	z1387 = x1387
+	z1388 = x1388
+	z1389 = x1389
+	z1390 = x1390
+	z1391 = x1391
+	z1392 = x1392
+	z1393 = x1393
+	z1394 = x1394
+	z1395 = x1395
+	z1396 = x1396
+	z1397 = x1397
+	z1398 = x1398
+	z1399 = x1399
+	z1400 = x1400
+	z1401 = x1401
+	z1402 = x1402
+	z1403 = x1403
+	z1404 = x1404
+	z1405 = x1405
+	z1406 = x1406
+	z1407 = x1407
+	z1408 = x1408
+	z1409 = x1409
+	z1410 = x1410
+	z1411 = x1411
+	z1412 = x1412
+	z1413 = x1413
+	z1414 = x1414
+	z1415 = x1415
+	z1416 = x1416
+	z1417 = x1417
+	z1418 = x1418
+	z1419 = x1419
+	z1420 = x1420
+	z1421 = x1421
+	z1422 = x1422
+	z1423 = x1423
+	z1424 = x1424
+	z1425 = x1425
+	z1426 = x1426
+	z1427 = x1427
+	z1428 = x1428
+	z1429 = x1429
+	z1430 = x1430
+	z1431 = x1431
+	z1432 = x1432
+	z1433 = x1433
+	z1434 = x1434
+	z1435 = x1435
+	z1436 = x1436
+	z1437 = x1437
+	z1438 = x1438
+	z1439 = x1439
+	z1440 = x1440
+	z1441 = x1441
+	z1442 = x1442
+	z1443 = x1443
+	z1444 = x1444
+	z1445 = x1445
+	z1446 = x1446
+	z1447 = x1447
+	z1448 = x1448
+	z1449 = x1449
+	z1450 = x1450
+	z1451 = x1451
+	z1452 = x1452
+	z1453 = x1453
+	z1454 = x1454
+	z1455 = x1455
+	z1456 = x1456
+	z1457 = x1457
+	z1458 = x1458
+	z1459 = x1459
+	z1460 = x1460
+	z1461 = x1461
+	z1462 = x1462
+	z1463 = x1463
+	z1464 = x1464
+	z1465 = x1465
+	z1466 = x1466
+	z1467 = x1467
+	z1468 = x1468
+	z1469 = x1469
+	z1470 = x1470
+	z1471 = x1471
+	z1472 = x1472
+	z1473 = x1473
+	z1474 = x1474
+	z1475 = x1475
+	z1476 = x1476
+	z1477 = x1477
+	z1478 = x1478
+	z1479 = x1479
+	z1480 = x1480
+	z1481 = x1481
+	z1482 = x1482
+	z1483 = x1483
+	z1484 = x1484
+	z1485 = x1485
+	z1486 = x1486
+	z1487 = x1487
+	z1488 = x1488
+	z1489 = x1489
+	z1490 = x1490
+	z1491 = x1491
+	z1492 = x1492
+	z1493 = x1493
+	z1494 = x1494
+	z1495 = x1495
+	z1496 = x1496
+	z1497 = x1497
+	z1498 = x1498
+	z1499 = x1499
+	z1500 = x1500
+	z1501 = x1501
+	z1502 = x1502
+	z1503 = x1503
+	z1504 = x1504
+	z1505 = x1505
+	z1506 = x1506
+	z1507 = x1507
+	z1508 = x1508
+	z1509 = x1509
+	z1510 = x1510
+	z1511 = x1511
+	z1512 = x1512
+	z1513 = x1513
+	z1514 = x1514
+	z1515 = x1515
+	z1516 = x1516
+	z1517 = x1517
+	z1518 = x1518
+	z1519 = x1519
+	z1520 = x1520
+	z1521 = x1521
+	z1522 = x1522
+	z1523 = x1523
+	z1524 = x1524
+	z1525 = x1525
+	z1526 = x1526
+	z1527 = x1527
+	z1528 = x1528
+	z1529 = x1529
+	z1530 = x1530
+	z1531 = x1531
+	z1532 = x1532
+	z1533 = x1533
+	z1534 = x1534
+	z1535 = x1535
+	z1536 = x1536
+	z1537 = x1537
+	z1538 = x1538
+	z1539 = x1539
+	z1540 = x1540
+	z1541 = x1541
+	z1542 = x1542
+	z1543 = x1543
+	z1544 = x1544
+	z1545 = x1545
+	z1546 = x1546
+	z1547 = x1547
+	z1548 = x1548
+	z1549 = x1549
+	z1550 = x1550
+	z1551 = x1551
+	z1552 = x1552
+	z1553 = x1553
+	z1554 = x1554
+	z1555 = x1555
+	z1556 = x1556
+	z1557 = x1557
+	z1558 = x1558
+	z1559 = x1559
+	z1560 = x1560
+	z1561 = x1561
+	z1562 = x1562
+	z1563 = x1563
+	z1564 = x1564
+	z1565 = x1565
+	z1566 = x1566
+	z1567 = x1567
+	z1568 = x1568
+	z1569 = x1569
+	z1570 = x1570
+	z1571 = x1571
+	z1572 = x1572
+	z1573 = x1573
+	z1574 = x1574
+	z1575 = x1575
+	z1576 = x1576
+	z1577 = x1577
+	z1578 = x1578
+	z1579 = x1579
+	z1580 = x1580
+	z1581 = x1581
+	z1582 = x1582
+	z1583 = x1583
+	z1584 = x1584
+	z1585 = x1585
+	z1586 = x1586
+	z1587 = x1587
+	z1588 = x1588
+	z1589 = x1589
+	z1590 = x1590
+	z1591 = x1591
+	z1592 = x1592
+	z1593 = x1593
+	z1594 = x1594
+	z1595 = x1595
+	z1596 = x1596
+	z1597 = x1597
+	z1598 = x1598
+	z1599 = x1599
+	z1600 = x1600
+	z1601 = x1601
+	z1602 = x1602
+	z1603 = x1603
+	z1604 = x1604
+	z1605 = x1605
+	z1606 = x1606
+	z1607 = x1607
+	z1608 = x1608
+	z1609 = x1609
+	z1610 = x1610
+	z1611 = x1611
+	z1612 = x1612
+	z1613 = x1613
+	z1614 = x1614
+	z1615 = x1615
+	z1616 = x1616
+	z1617 = x1617
+	z1618 = x1618
+	z1619 = x1619
+	z1620 = x1620
+	z1621 = x1621
+	z1622 = x1622
+	z1623 = x1623
+	z1624 = x1624
+	z1625 = x1625
+	z1626 = x1626
+	z1627 = x1627
+	z1628 = x1628
+	z1629 = x1629
+	z1630 = x1630
+	z1631 = x1631
+	z1632 = x1632
+	z1633 = x1633
+	z1634 = x1634
+	z1635 = x1635
+	z1636 = x1636
+	z1637 = x1637
+	z1638 = x1638
+	z1639 = x1639
+	z1640 = x1640
+	z1641 = x1641
+	z1642 = x1642
+	z1643 = x1643
+	z1644 = x1644
+	z1645 = x1645
+	z1646 = x1646
+	z1647 = x1647
+	z1648 = x1648
+	z1649 = x1649
+	z1650 = x1650
+	z1651 = x1651
+	z1652 = x1652
+	z1653 = x1653
+	z1654 = x1654
+	z1655 = x1655
+	z1656 = x1656
+	z1657 = x1657
+	z1658 = x1658
+	z1659 = x1659
+	z1660 = x1660
+	z1661 = x1661
+	z1662 = x1662
+	z1663 = x1663
+	z1664 = x1664
+	z1665 = x1665
+	z1666 = x1666
+	z1667 = x1667
+	z1668 = x1668
+	z1669 = x1669
+	z1670 = x1670
+	z1671 = x1671
+	z1672 = x1672
+	z1673 = x1673
+	z1674 = x1674
+	z1675 = x1675
+	z1676 = x1676
+	z1677 = x1677
+	z1678 = x1678
+	z1679 = x1679
+	z1680 = x1680
+	z1681 = x1681
+	z1682 = x1682
+	z1683 = x1683
+	z1684 = x1684
+	z1685 = x1685
+	z1686 = x1686
+	z1687 = x1687
+	z1688 = x1688
+	z1689 = x1689
+	z1690 = x1690
+	z1691 = x1691
+	z1692 = x1692
+	z1693 = x1693
+	z1694 = x1694
+	z1695 = x1695
+	z1696 = x1696
+	z1697 = x1697
+	z1698 = x1698
+	z1699 = x1699
+	z1700 = x1700
+	z1701 = x1701
+	z1702 = x1702
+	z1703 = x1703
+	z1704 = x1704
+	z1705 = x1705
+	z1706 = x1706
+	z1707 = x1707
+	z1708 = x1708
+	z1709 = x1709
+	z1710 = x1710
+	z1711 = x1711
+	z1712 = x1712
+	z1713 = x1713
+	z1714 = x1714
+	z1715 = x1715
+	z1716 = x1716
+	z1717 = x1717
+	z1718 = x1718
+	z1719 = x1719
+	z1720 = x1720
+	z1721 = x1721
+	z1722 = x1722
+	z1723 = x1723
+	z1724 = x1724
+	z1725 = x1725
+	z1726 = x1726
+	z1727 = x1727
+	z1728 = x1728
+	z1729 = x1729
+	z1730 = x1730
+	z1731 = x1731
+	z1732 = x1732
+	z1733 = x1733
+	z1734 = x1734
+	z1735 = x1735
+	z1736 = x1736
+	z1737 = x1737
+	z1738 = x1738
+	z1739 = x1739
+	z1740 = x1740
+	z1741 = x1741
+	z1742 = x1742
+	z1743 = x1743
+	z1744 = x1744
+	z1745 = x1745
+	z1746 = x1746
+	z1747 = x1747
+	z1748 = x1748
+	z1749 = x1749
+	z1750 = x1750
+	z1751 = x1751
+	z1752 = x1752
+	z1753 = x1753
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+	z1755 = x1755
+	z1756 = x1756
+	z1757 = x1757
+	z1758 = x1758
+	z1759 = x1759
+	z1760 = x1760
+	z1761 = x1761
+	z1762 = x1762
+	z1763 = x1763
+	z1764 = x1764
+	z1765 = x1765
+	z1766 = x1766
+	z1767 = x1767
+	z1768 = x1768
+	z1769 = x1769
+	z1770 = x1770
+	z1771 = x1771
+	z1772 = x1772
+	z1773 = x1773
+	z1774 = x1774
+	z1775 = x1775
+	z1776 = x1776
+	z1777 = x1777
+	z1778 = x1778
+	z1779 = x1779
+	z1780 = x1780
+	z1781 = x1781
+	z1782 = x1782
+	z1783 = x1783
+	z1784 = x1784
+	z1785 = x1785
+	z1786 = x1786
+	z1787 = x1787
+	z1788 = x1788
+	z1789 = x1789
+	z1790 = x1790
+	z1791 = x1791
+	z1792 = x1792
+	z1793 = x1793
+	z1794 = x1794
+	z1795 = x1795
+	z1796 = x1796
+	z1797 = x1797
+	z1798 = x1798
+	z1799 = x1799
+	z1800 = x1800
+	z1801 = x1801
+	z1802 = x1802
+	z1803 = x1803
+	z1804 = x1804
+	z1805 = x1805
+	z1806 = x1806
+	z1807 = x1807
+	z1808 = x1808
+	z1809 = x1809
+	z1810 = x1810
+	z1811 = x1811
+	z1812 = x1812
+	z1813 = x1813
+	z1814 = x1814
+	z1815 = x1815
+	z1816 = x1816
+	z1817 = x1817
+	z1818 = x1818
+	z1819 = x1819
+	z1820 = x1820
+	z1821 = x1821
+	z1822 = x1822
+	z1823 = x1823
+	z1824 = x1824
+	z1825 = x1825
+	z1826 = x1826
+	z1827 = x1827
+	z1828 = x1828
+	z1829 = x1829
+	z1830 = x1830
+	z1831 = x1831
+	z1832 = x1832
+	z1833 = x1833
+	z1834 = x1834
+	z1835 = x1835
+	z1836 = x1836
+	z1837 = x1837
+	z1838 = x1838
+	z1839 = x1839
+	z1840 = x1840
+	z1841 = x1841
+	z1842 = x1842
+	z1843 = x1843
+	z1844 = x1844
+	z1845 = x1845
+	z1846 = x1846
+	z1847 = x1847
+	z1848 = x1848
+	z1849 = x1849
+	z1850 = x1850
+	z1851 = x1851
+	z1852 = x1852
+	z1853 = x1853
+	z1854 = x1854
+	z1855 = x1855
+	z1856 = x1856
+	z1857 = x1857
+	z1858 = x1858
+	z1859 = x1859
+	z1860 = x1860
+	z1861 = x1861
+	z1862 = x1862
+	z1863 = x1863
+	z1864 = x1864
+	z1865 = x1865
+	z1866 = x1866
+	z1867 = x1867
+	z1868 = x1868
+	z1869 = x1869
+	z1870 = x1870
+	z1871 = x1871
+	z1872 = x1872
+	z1873 = x1873
+	z1874 = x1874
+	z1875 = x1875
+	z1876 = x1876
+	z1877 = x1877
+	z1878 = x1878
+	z1879 = x1879
+	z1880 = x1880
+	z1881 = x1881
+	z1882 = x1882
+	z1883 = x1883
+	z1884 = x1884
+	z1885 = x1885
+	z1886 = x1886
+	z1887 = x1887
+	z1888 = x1888
+	z1889 = x1889
+	z1890 = x1890
+	z1891 = x1891
+	z1892 = x1892
+	z1893 = x1893
+	z1894 = x1894
+	z1895 = x1895
+	z1896 = x1896
+	z1897 = x1897
+	z1898 = x1898
+	z1899 = x1899
+	z1900 = x1900
+	z1901 = x1901
+	z1902 = x1902
+	z1903 = x1903
+	z1904 = x1904
+	z1905 = x1905
+	z1906 = x1906
+	z1907 = x1907
+	z1908 = x1908
+	z1909 = x1909
+	z1910 = x1910
+	z1911 = x1911
+	z1912 = x1912
+	z1913 = x1913
+	z1914 = x1914
+	z1915 = x1915
+	z1916 = x1916
+	z1917 = x1917
+	z1918 = x1918
+	z1919 = x1919
+	z1920 = x1920
+	z1921 = x1921
+	z1922 = x1922
+	z1923 = x1923
+	z1924 = x1924
+	z1925 = x1925
+	z1926 = x1926
+	z1927 = x1927
+	z1928 = x1928
+	z1929 = x1929
+	z1930 = x1930
+	z1931 = x1931
+	z1932 = x1932
+	z1933 = x1933
+	z1934 = x1934
+	z1935 = x1935
+	z1936 = x1936
+	z1937 = x1937
+	z1938 = x1938
+	z1939 = x1939
+	z1940 = x1940
+	z1941 = x1941
+	z1942 = x1942
+	z1943 = x1943
+	z1944 = x1944
+	z1945 = x1945
+	z1946 = x1946
+	z1947 = x1947
+	z1948 = x1948
+	z1949 = x1949
+	z1950 = x1950
+	z1951 = x1951
+	z1952 = x1952
+	z1953 = x1953
+	z1954 = x1954
+	z1955 = x1955
+	z1956 = x1956
+	z1957 = x1957
+	z1958 = x1958
+	z1959 = x1959
+	z1960 = x1960
+	z1961 = x1961
+	z1962 = x1962
+	z1963 = x1963
+	z1964 = x1964
+	z1965 = x1965
+	z1966 = x1966
+	z1967 = x1967
+	z1968 = x1968
+	z1969 = x1969
+	z1970 = x1970
+	z1971 = x1971
+	z1972 = x1972
+	z1973 = x1973
+	z1974 = x1974
+	z1975 = x1975
+	z1976 = x1976
+	z1977 = x1977
+	z1978 = x1978
+	z1979 = x1979
+	z1980 = x1980
+	z1981 = x1981
+	z1982 = x1982
+	z1983 = x1983
+	z1984 = x1984
+	z1985 = x1985
+	z1986 = x1986
+	z1987 = x1987
+	z1988 = x1988
+	z1989 = x1989
+	z1990 = x1990
+	z1991 = x1991
+	z1992 = x1992
+	z1993 = x1993
+	z1994 = x1994
+	z1995 = x1995
+	z1996 = x1996
+	z1997 = x1997
+	z1998 = x1998
+	z1999 = x1999
+	z2000 = x2000
+	z2001 = x2001
+	z2002 = x2002
+	z2003 = x2003
+	z2004 = x2004
+	z2005 = x2005
+	z2006 = x2006
+	z2007 = x2007
+	z2008 = x2008
+	z2009 = x2009
+	z2010 = x2010
+	z2011 = x2011
+	z2012 = x2012
+	z2013 = x2013
+	z2014 = x2014
+	z2015 = x2015
+	z2016 = x2016
+	z2017 = x2017
+	z2018 = x2018
+	z2019 = x2019
+	z2020 = x2020
+	z2021 = x2021
+	z2022 = x2022
+	z2023 = x2023
+	z2024 = x2024
+	z2025 = x2025
+	z2026 = x2026
+	z2027 = x2027
+	z2028 = x2028
+	z2029 = x2029
+	z2030 = x2030
+	z2031 = x2031
+	z2032 = x2032
+	z2033 = x2033
+	z2034 = x2034
+	z2035 = x2035
+	z2036 = x2036
+	z2037 = x2037
+	z2038 = x2038
+	z2039 = x2039
+	z2040 = x2040
+	z2041 = x2041
+	z2042 = x2042
+	z2043 = x2043
+	z2044 = x2044
+	z2045 = x2045
+	z2046 = x2046
+	z2047 = x2047
+	z2048 = x2048
+	z2049 = x2049
+	z2050 = x2050
+	z2051 = x2051
+	z2052 = x2052
+	z2053 = x2053
+	z2054 = x2054
+	z2055 = x2055
+	z2056 = x2056
+	z2057 = x2057
+	z2058 = x2058
+	z2059 = x2059
+	z2060 = x2060
+	z2061 = x2061
+	z2062 = x2062
+	z2063 = x2063
+	z2064 = x2064
+	z2065 = x2065
+	z2066 = x2066
+	z2067 = x2067
+	z2068 = x2068
+	z2069 = x2069
+	z2070 = x2070
+	z2071 = x2071
+	z2072 = x2072
+	z2073 = x2073
+	z2074 = x2074
+	z2075 = x2075
+	z2076 = x2076
+	z2077 = x2077
+	z2078 = x2078
+	z2079 = x2079
+	z2080 = x2080
+	z2081 = x2081
+	z2082 = x2082
+	z2083 = x2083
+	z2084 = x2084
+	z2085 = x2085
+	z2086 = x2086
+	z2087 = x2087
+	z2088 = x2088
+	z2089 = x2089
+	z2090 = x2090
+	z2091 = x2091
+	z2092 = x2092
+	z2093 = x2093
+	z2094 = x2094
+	z2095 = x2095
+	z2096 = x2096
+	z2097 = x2097
+	z2098 = x2098
+	z2099 = x2099
+	z2100 = x2100
+	z2101 = x2101
+	z2102 = x2102
+	z2103 = x2103
+	z2104 = x2104
+	z2105 = x2105
+	z2106 = x2106
+	z2107 = x2107
+	z2108 = x2108
+	z2109 = x2109
+	z2110 = x2110
+	z2111 = x2111
+	z2112 = x2112
+	z2113 = x2113
+	z2114 = x2114
+	z2115 = x2115
+	z2116 = x2116
+	z2117 = x2117
+	z2118 = x2118
+	z2119 = x2119
+	z2120 = x2120
+	z2121 = x2121
+	z2122 = x2122
+	z2123 = x2123
+	z2124 = x2124
+	z2125 = x2125
+	z2126 = x2126
+	z2127 = x2127
+	z2128 = x2128
+	z2129 = x2129
+	z2130 = x2130
+	z2131 = x2131
+	z2132 = x2132
+	z2133 = x2133
+	z2134 = x2134
+	z2135 = x2135
+	z2136 = x2136
+	z2137 = x2137
+	z2138 = x2138
+	z2139 = x2139
+	z2140 = x2140
+	z2141 = x2141
+	z2142 = x2142
+	z2143 = x2143
+	z2144 = x2144
+	z2145 = x2145
+	z2146 = x2146
+	z2147 = x2147
+	z2148 = x2148
+	z2149 = x2149
+	z2150 = x2150
+	z2151 = x2151
+	z2152 = x2152
+	z2153 = x2153
+	z2154 = x2154
+	z2155 = x2155
+	z2156 = x2156
+	z2157 = x2157
+	z2158 = x2158
+	z2159 = x2159
+	z2160 = x2160
+	z2161 = x2161
+	z2162 = x2162
+	z2163 = x2163
+	z2164 = x2164
+	z2165 = x2165
+	z2166 = x2166
+	z2167 = x2167
+	z2168 = x2168
+	z2169 = x2169
+	z2170 = x2170
+	z2171 = x2171
+	z2172 = x2172
+	z2173 = x2173
+	z2174 = x2174
+	z2175 = x2175
+	z2176 = x2176
+	z2177 = x2177
+	z2178 = x2178
+	z2179 = x2179
+	z2180 = x2180
+	z2181 = x2181
+	z2182 = x2182
+	z2183 = x2183
+	z2184 = x2184
+	z2185 = x2185
+	z2186 = x2186
+	z2187 = x2187
+	z2188 = x2188
+	z2189 = x2189
+	z2190 = x2190
+	z2191 = x2191
+	z2192 = x2192
+	z2193 = x2193
+	z2194 = x2194
+	z2195 = x2195
+	z2196 = x2196
+	z2197 = x2197
+	z2198 = x2198
+	z2199 = x2199
+	z2200 = x2200
+	z2201 = x2201
+	z2202 = x2202
+	z2203 = x2203
+	z2204 = x2204
+	z2205 = x2205
+	z2206 = x2206
+	z2207 = x2207
+	z2208 = x2208
+	z2209 = x2209
+	z2210 = x2210
+	z2211 = x2211
+	z2212 = x2212
+	z2213 = x2213
+	z2214 = x2214
+	z2215 = x2215
+	z2216 = x2216
+	z2217 = x2217
+	z2218 = x2218
+	z2219 = x2219
+	z2220 = x2220
+	z2221 = x2221
+	z2222 = x2222
+	z2223 = x2223
+	z2224 = x2224
+	z2225 = x2225
+	z2226 = x2226
+	z2227 = x2227
+	z2228 = x2228
+	z2229 = x2229
+	z2230 = x2230
+	z2231 = x2231
+	z2232 = x2232
+	z2233 = x2233
+	z2234 = x2234
+	z2235 = x2235
+	z2236 = x2236
+	z2237 = x2237
+	z2238 = x2238
+	z2239 = x2239
+	z2240 = x2240
+	z2241 = x2241
+	z2242 = x2242
+	z2243 = x2243
+	z2244 = x2244
+	z2245 = x2245
+	z2246 = x2246
+	z2247 = x2247
+	z2248 = x2248
+	z2249 = x2249
+	z2250 = x2250
+	z2251 = x2251
+	z2252 = x2252
+	z2253 = x2253
+	z2254 = x2254
+	z2255 = x2255
+	z2256 = x2256
+	z2257 = x2257
+	z2258 = x2258
+	z2259 = x2259
+	z2260 = x2260
+	z2261 = x2261
+	z2262 = x2262
+	z2263 = x2263
+	z2264 = x2264
+	z2265 = x2265
+	z2266 = x2266
+	z2267 = x2267
+	z2268 = x2268
+	z2269 = x2269
+	z2270 = x2270
+	z2271 = x2271
+	z2272 = x2272
+	z2273 = x2273
+	z2274 = x2274
+	z2275 = x2275
+	z2276 = x2276
+	z2277 = x2277
+	z2278 = x2278
+	z2279 = x2279
+	z2280 = x2280
+	z2281 = x2281
+	z2282 = x2282
+	z2283 = x2283
+	z2284 = x2284
+	z2285 = x2285
+	z2286 = x2286
+	z2287 = x2287
+	z2288 = x2288
+	z2289 = x2289
+	z2290 = x2290
+	z2291 = x2291
+	z2292 = x2292
+	z2293 = x2293
+	z2294 = x2294
+	z2295 = x2295
+	z2296 = x2296
+	z2297 = x2297
+	z2298 = x2298
+	z2299 = x2299
+	z2300 = x2300
+	z2301 = x2301
+	z2302 = x2302
+	z2303 = x2303
+	z2304 = x2304
+	z2305 = x2305
+	z2306 = x2306
+	z2307 = x2307
+	z2308 = x2308
+	z2309 = x2309
+	z2310 = x2310
+	z2311 = x2311
+	z2312 = x2312
+	z2313 = x2313
+	z2314 = x2314
+	z2315 = x2315
+	z2316 = x2316
+	z2317 = x2317
+	z2318 = x2318
+	z2319 = x2319
+	z2320 = x2320
+	z2321 = x2321
+	z2322 = x2322
+	z2323 = x2323
+	z2324 = x2324
+	z2325 = x2325
+	z2326 = x2326
+	z2327 = x2327
+	z2328 = x2328
+	z2329 = x2329
+	z2330 = x2330
+	z2331 = x2331
+	z2332 = x2332
+	z2333 = x2333
+	z2334 = x2334
+	z2335 = x2335
+	z2336 = x2336
+	z2337 = x2337
+	z2338 = x2338
+	z2339 = x2339
+	z2340 = x2340
+	z2341 = x2341
+	z2342 = x2342
+	z2343 = x2343
+	z2344 = x2344
+	z2345 = x2345
+	z2346 = x2346
+	z2347 = x2347
+	z2348 = x2348
+	z2349 = x2349
+	z2350 = x2350
+	z2351 = x2351
+	z2352 = x2352
+	z2353 = x2353
+	z2354 = x2354
+	z2355 = x2355
+	z2356 = x2356
+	z2357 = x2357
+	z2358 = x2358
+	z2359 = x2359
+	z2360 = x2360
+	z2361 = x2361
+	z2362 = x2362
+	z2363 = x2363
+	z2364 = x2364
+	z2365 = x2365
+	z2366 = x2366
+	z2367 = x2367
+	z2368 = x2368
+	z2369 = x2369
+	z2370 = x2370
+	z2371 = x2371
+	z2372 = x2372
+	z2373 = x2373
+	z2374 = x2374
+	z2375 = x2375
+	z2376 = x2376
+	z2377 = x2377
+	z2378 = x2378
+	z2379 = x2379
+	z2380 = x2380
+	z2381 = x2381
+	z2382 = x2382
+	z2383 = x2383
+	z2384 = x2384
+	z2385 = x2385
+	z2386 = x2386
+	z2387 = x2387
+	z2388 = x2388
+	z2389 = x2389
+	z2390 = x2390
+	z2391 = x2391
+	z2392 = x2392
+	z2393 = x2393
+	z2394 = x2394
+	z2395 = x2395
+	z2396 = x2396
+	z2397 = x2397
+	z2398 = x2398
+	z2399 = x2399
+	z2400 = x2400
+	z2401 = x2401
+	z2402 = x2402
+	z2403 = x2403
+	z2404 = x2404
+	z2405 = x2405
+	z2406 = x2406
+	z2407 = x2407
+	z2408 = x2408
+	z2409 = x2409
+	z2410 = x2410
+	z2411 = x2411
+	z2412 = x2412
+	z2413 = x2413
+	z2414 = x2414
+	z2415 = x2415
+	z2416 = x2416
+	z2417 = x2417
+	z2418 = x2418
+	z2419 = x2419
+	z2420 = x2420
+	z2421 = x2421
+	z2422 = x2422
+	z2423 = x2423
+	z2424 = x2424
+	z2425 = x2425
+	z2426 = x2426
+	z2427 = x2427
+	z2428 = x2428
+	z2429 = x2429
+	z2430 = x2430
+	z2431 = x2431
+	z2432 = x2432
+	z2433 = x2433
+	z2434 = x2434
+	z2435 = x2435
+	z2436 = x2436
+	z2437 = x2437
+	z2438 = x2438
+	z2439 = x2439
+	z2440 = x2440
+	z2441 = x2441
+	z2442 = x2442
+	z2443 = x2443
+	z2444 = x2444
+	z2445 = x2445
+	z2446 = x2446
+	z2447 = x2447
+	z2448 = x2448
+	z2449 = x2449
+	z2450 = x2450
+	z2451 = x2451
+	z2452 = x2452
+	z2453 = x2453
+	z2454 = x2454
+	z2455 = x2455
+	z2456 = x2456
+	z2457 = x2457
+	z2458 = x2458
+	z2459 = x2459
+	z2460 = x2460
+	z2461 = x2461
+	z2462 = x2462
+	z2463 = x2463
+	z2464 = x2464
+	z2465 = x2465
+	z2466 = x2466
+	z2467 = x2467
+	z2468 = x2468
+	z2469 = x2469
+	z2470 = x2470
+	z2471 = x2471
+	z2472 = x2472
+	z2473 = x2473
+	z2474 = x2474
+	z2475 = x2475
+	z2476 = x2476
+	z2477 = x2477
+	z2478 = x2478
+	z2479 = x2479
+	z2480 = x2480
+	z2481 = x2481
+	z2482 = x2482
+	z2483 = x2483
+	z2484 = x2484
+	z2485 = x2485
+	z2486 = x2486
+	z2487 = x2487
+	z2488 = x2488
+	z2489 = x2489
+	z2490 = x2490
+	z2491 = x2491
+	z2492 = x2492
+	z2493 = x2493
+	z2494 = x2494
+	z2495 = x2495
+	z2496 = x2496
+	z2497 = x2497
+	z2498 = x2498
+	z2499 = x2499
+	z2500 = x2500
+	z2501 = x2501
+	z2502 = x2502
+	z2503 = x2503
+	z2504 = x2504
+	z2505 = x2505
+	z2506 = x2506
+	z2507 = x2507
+	z2508 = x2508
+	z2509 = x2509
+	z2510 = x2510
+	z2511 = x2511
+	z2512 = x2512
+	z2513 = x2513
+	z2514 = x2514
+	z2515 = x2515
+	z2516 = x2516
+	z2517 = x2517
+	z2518 = x2518
+	z2519 = x2519
+	z2520 = x2520
+	z2521 = x2521
+	z2522 = x2522
+	z2523 = x2523
+	z2524 = x2524
+	z2525 = x2525
+	z2526 = x2526
+	z2527 = x2527
+	z2528 = x2528
+	z2529 = x2529
+	z2530 = x2530
+	z2531 = x2531
+	z2532 = x2532
+	z2533 = x2533
+	z2534 = x2534
+	z2535 = x2535
+	z2536 = x2536
+	z2537 = x2537
+	z2538 = x2538
+	z2539 = x2539
+	z2540 = x2540
+	z2541 = x2541
+	z2542 = x2542
+	z2543 = x2543
+	z2544 = x2544
+	z2545 = x2545
+	z2546 = x2546
+	z2547 = x2547
+	z2548 = x2548
+	z2549 = x2549
+	z2550 = x2550
+	z2551 = x2551
+	z2552 = x2552
+	z2553 = x2553
+	z2554 = x2554
+	z2555 = x2555
+	z2556 = x2556
+	z2557 = x2557
+	z2558 = x2558
+	z2559 = x2559
+	z2560 = x2560
+	z2561 = x2561
+	z2562 = x2562
+	z2563 = x2563
+	z2564 = x2564
+	z2565 = x2565
+	z2566 = x2566
+	z2567 = x2567
+	z2568 = x2568
+	z2569 = x2569
+	z2570 = x2570
+	z2571 = x2571
+	z2572 = x2572
+	z2573 = x2573
+	z2574 = x2574
+	z2575 = x2575
+	z2576 = x2576
+	z2577 = x2577
+	z2578 = x2578
+	z2579 = x2579
+	z2580 = x2580
+	z2581 = x2581
+	z2582 = x2582
+	z2583 = x2583
+	z2584 = x2584
+	z2585 = x2585
+	z2586 = x2586
+	z2587 = x2587
+	z2588 = x2588
+	z2589 = x2589
+	z2590 = x2590
+	z2591 = x2591
+	z2592 = x2592
+	z2593 = x2593
+	z2594 = x2594
+	z2595 = x2595
+	z2596 = x2596
+	z2597 = x2597
+	z2598 = x2598
+	z2599 = x2599
+	z2600 = x2600
+	z2601 = x2601
+	z2602 = x2602
+	z2603 = x2603
+	z2604 = x2604
+	z2605 = x2605
+	z2606 = x2606
+	z2607 = x2607
+	z2608 = x2608
+	z2609 = x2609
+	z2610 = x2610
+	z2611 = x2611
+	z2612 = x2612
+	z2613 = x2613
+	z2614 = x2614
+	z2615 = x2615
+	z2616 = x2616
+	z2617 = x2617
+	z2618 = x2618
+	z2619 = x2619
+	z2620 = x2620
+	z2621 = x2621
+	z2622 = x2622
+	z2623 = x2623
+	z2624 = x2624
+	z2625 = x2625
+	z2626 = x2626
+	z2627 = x2627
+	z2628 = x2628
+	z2629 = x2629
+	z2630 = x2630
+	z2631 = x2631
+	z2632 = x2632
+	z2633 = x2633
+	z2634 = x2634
+	z2635 = x2635
+	z2636 = x2636
+	z2637 = x2637
+	z2638 = x2638
+	z2639 = x2639
+	z2640 = x2640
+	z2641 = x2641
+	z2642 = x2642
+	z2643 = x2643
+	z2644 = x2644
+	z2645 = x2645
+	z2646 = x2646
+	z2647 = x2647
+	z2648 = x2648
+	z2649 = x2649
+	z2650 = x2650
+	z2651 = x2651
+	z2652 = x2652
+	z2653 = x2653
+	z2654 = x2654
+	z2655 = x2655
+	z2656 = x2656
+	z2657 = x2657
+	z2658 = x2658
+	z2659 = x2659
+	z2660 = x2660
+	z2661 = x2661
+	z2662 = x2662
+	z2663 = x2663
+	z2664 = x2664
+	z2665 = x2665
+	z2666 = x2666
+	z2667 = x2667
+	z2668 = x2668
+	z2669 = x2669
+	z2670 = x2670
+	z2671 = x2671
+	z2672 = x2672
+	z2673 = x2673
+	z2674 = x2674
+	z2675 = x2675
+	z2676 = x2676
+	z2677 = x2677
+	z2678 = x2678
+	z2679 = x2679
+	z2680 = x2680
+	z2681 = x2681
+	z2682 = x2682
+	z2683 = x2683
+	z2684 = x2684
+	z2685 = x2685
+	z2686 = x2686
+	z2687 = x2687
+	z2688 = x2688
+	z2689 = x2689
+	z2690 = x2690
+	z2691 = x2691
+	z2692 = x2692
+	z2693 = x2693
+	z2694 = x2694
+	z2695 = x2695
+	z2696 = x2696
+	z2697 = x2697
+	z2698 = x2698
+	z2699 = x2699
+	z2700 = x2700
+	z2701 = x2701
+	z2702 = x2702
+	z2703 = x2703
+	z2704 = x2704
+	z2705 = x2705
+	z2706 = x2706
+	z2707 = x2707
+	z2708 = x2708
+	z2709 = x2709
+	z2710 = x2710
+	z2711 = x2711
+	z2712 = x2712
+	z2713 = x2713
+	z2714 = x2714
+	z2715 = x2715
+	z2716 = x2716
+	z2717 = x2717
+	z2718 = x2718
+	z2719 = x2719
+	z2720 = x2720
+	z2721 = x2721
+	z2722 = x2722
+	z2723 = x2723
+	z2724 = x2724
+	z2725 = x2725
+	z2726 = x2726
+	z2727 = x2727
+	z2728 = x2728
+	z2729 = x2729
+	z2730 = x2730
+	z2731 = x2731
+	z2732 = x2732
+	z2733 = x2733
+	z2734 = x2734
+	z2735 = x2735
+	z2736 = x2736
+	z2737 = x2737
+	z2738 = x2738
+	z2739 = x2739
+	z2740 = x2740
+	z2741 = x2741
+	z2742 = x2742
+	z2743 = x2743
+	z2744 = x2744
+	z2745 = x2745
+	z2746 = x2746
+	z2747 = x2747
+	z2748 = x2748
+	z2749 = x2749
+	z2750 = x2750
+	z2751 = x2751
+	z2752 = x2752
+	z2753 = x2753
+	z2754 = x2754
+	z2755 = x2755
+	z2756 = x2756
+	z2757 = x2757
+	z2758 = x2758
+	z2759 = x2759
+	z2760 = x2760
+	z2761 = x2761
+	z2762 = x2762
+	z2763 = x2763
+	z2764 = x2764
+	z2765 = x2765
+	z2766 = x2766
+	z2767 = x2767
+	z2768 = x2768
+	z2769 = x2769
+	z2770 = x2770
+	z2771 = x2771
+	z2772 = x2772
+	z2773 = x2773
+	z2774 = x2774
+	z2775 = x2775
+	z2776 = x2776
+	z2777 = x2777
+	z2778 = x2778
+	z2779 = x2779
+	z2780 = x2780
+	z2781 = x2781
+	z2782 = x2782
+	z2783 = x2783
+	z2784 = x2784
+	z2785 = x2785
+	z2786 = x2786
+	z2787 = x2787
+	z2788 = x2788
+	z2789 = x2789
+	z2790 = x2790
+	z2791 = x2791
+	z2792 = x2792
+	z2793 = x2793
+	z2794 = x2794
+	z2795 = x2795
+	z2796 = x2796
+	z2797 = x2797
+	z2798 = x2798
+	z2799 = x2799
+	z2800 = x2800
+	z2801 = x2801
+	z2802 = x2802
+	z2803 = x2803
+	z2804 = x2804
+	z2805 = x2805
+	z2806 = x2806
+	z2807 = x2807
+	z2808 = x2808
+	z2809 = x2809
+	z2810 = x2810
+	z2811 = x2811
+	z2812 = x2812
+	z2813 = x2813
+	z2814 = x2814
+	z2815 = x2815
+	z2816 = x2816
+	z2817 = x2817
+	z2818 = x2818
+	z2819 = x2819
+	z2820 = x2820
+	z2821 = x2821
+	z2822 = x2822
+	z2823 = x2823
+	z2824 = x2824
+	z2825 = x2825
+	z2826 = x2826
+	z2827 = x2827
+	z2828 = x2828
+	z2829 = x2829
+	z2830 = x2830
+	z2831 = x2831
+	z2832 = x2832
+	z2833 = x2833
+	z2834 = x2834
+	z2835 = x2835
+	z2836 = x2836
+	z2837 = x2837
+	z2838 = x2838
+	z2839 = x2839
+	z2840 = x2840
+	z2841 = x2841
+	z2842 = x2842
+	z2843 = x2843
+	z2844 = x2844
+	z2845 = x2845
+	z2846 = x2846
+	z2847 = x2847
+	z2848 = x2848
+	z2849 = x2849
+	z2850 = x2850
+	z2851 = x2851
+	z2852 = x2852
+	z2853 = x2853
+	z2854 = x2854
+	z2855 = x2855
+	z2856 = x2856
+	z2857 = x2857
+	z2858 = x2858
+	z2859 = x2859
+	z2860 = x2860
+	z2861 = x2861
+	z2862 = x2862
+	z2863 = x2863
+	z2864 = x2864
+	z2865 = x2865
+	z2866 = x2866
+	z2867 = x2867
+	z2868 = x2868
+	z2869 = x2869
+	z2870 = x2870
+	z2871 = x2871
+	z2872 = x2872
+	z2873 = x2873
+	z2874 = x2874
+	z2875 = x2875
+	z2876 = x2876
+	z2877 = x2877
+	z2878 = x2878
+	z2879 = x2879
+	z2880 = x2880
+	z2881 = x2881
+	z2882 = x2882
+	z2883 = x2883
+	z2884 = x2884
+	z2885 = x2885
+	z2886 = x2886
+	z2887 = x2887
+	z2888 = x2888
+	z2889 = x2889
+	z2890 = x2890
+	z2891 = x2891
+	z2892 = x2892
+	z2893 = x2893
+	z2894 = x2894
+	z2895 = x2895
+	z2896 = x2896
+	z2897 = x2897
+	z2898 = x2898
+	z2899 = x2899
+	z2900 = x2900
+	z2901 = x2901
+	z2902 = x2902
+	z2903 = x2903
+	z2904 = x2904
+	z2905 = x2905
+	z2906 = x2906
+	z2907 = x2907
+	z2908 = x2908
+	z2909 = x2909
+	z2910 = x2910
+	z2911 = x2911
+	z2912 = x2912
+	z2913 = x2913
+	z2914 = x2914
+	z2915 = x2915
+	z2916 = x2916
+	z2917 = x2917
+	z2918 = x2918
+	z2919 = x2919
+	z2920 = x2920
+	z2921 = x2921
+	z2922 = x2922
+	z2923 = x2923
+	z2924 = x2924
+	z2925 = x2925
+	z2926 = x2926
+	z2927 = x2927
+	z2928 = x2928
+	z2929 = x2929
+	z2930 = x2930
+	z2931 = x2931
+	z2932 = x2932
+	z2933 = x2933
+	z2934 = x2934
+	z2935 = x2935
+	z2936 = x2936
+	z2937 = x2937
+	z2938 = x2938
+	z2939 = x2939
+	z2940 = x2940
+	z2941 = x2941
+	z2942 = x2942
+	z2943 = x2943
+	z2944 = x2944
+	z2945 = x2945
+	z2946 = x2946
+	z2947 = x2947
+	z2948 = x2948
+	z2949 = x2949
+	z2950 = x2950
+	z2951 = x2951
+	z2952 = x2952
+	z2953 = x2953
+	z2954 = x2954
+	z2955 = x2955
+	z2956 = x2956
+	z2957 = x2957
+	z2958 = x2958
+	z2959 = x2959
+	z2960 = x2960
+	z2961 = x2961
+	z2962 = x2962
+	z2963 = x2963
+	z2964 = x2964
+	z2965 = x2965
+	z2966 = x2966
+	z2967 = x2967
+	z2968 = x2968
+	z2969 = x2969
+	z2970 = x2970
+	z2971 = x2971
+	z2972 = x2972
+	z2973 = x2973
+	z2974 = x2974
+	z2975 = x2975
+	z2976 = x2976
+	z2977 = x2977
+	z2978 = x2978
+	z2979 = x2979
+	z2980 = x2980
+	z2981 = x2981
+	z2982 = x2982
+	z2983 = x2983
+	z2984 = x2984
+	z2985 = x2985
+	z2986 = x2986
+	z2987 = x2987
+	z2988 = x2988
+	z2989 = x2989
+	z2990 = x2990
+	z2991 = x2991
+	z2992 = x2992
+	z2993 = x2993
+	z2994 = x2994
+	z2995 = x2995
+	z2996 = x2996
+	z2997 = x2997
+	z2998 = x2998
+	z2999 = x2999
+	z3000 = x3000
+	z3001 = x3001
+	z3002 = x3002
+	z3003 = x3003
+	z3004 = x3004
+	z3005 = x3005
+	z3006 = x3006
+	z3007 = x3007
+	z3008 = x3008
+	z3009 = x3009
+	z3010 = x3010
+	z3011 = x3011
+	z3012 = x3012
+	z3013 = x3013
+	z3014 = x3014
+	z3015 = x3015
+	z3016 = x3016
+	z3017 = x3017
+	z3018 = x3018
+	z3019 = x3019
+	z3020 = x3020
+	z3021 = x3021
+	z3022 = x3022
+	z3023 = x3023
+	z3024 = x3024
+	z3025 = x3025
+	z3026 = x3026
+	z3027 = x3027
+	z3028 = x3028
+	z3029 = x3029
+	z3030 = x3030
+	z3031 = x3031
+	z3032 = x3032
+	z3033 = x3033
+	z3034 = x3034
+	z3035 = x3035
+	z3036 = x3036
+	z3037 = x3037
+	z3038 = x3038
+	z3039 = x3039
+	z3040 = x3040
+	z3041 = x3041
+	z3042 = x3042
+	z3043 = x3043
+	z3044 = x3044
+	z3045 = x3045
+	z3046 = x3046
+	z3047 = x3047
+	z3048 = x3048
+	z3049 = x3049
+	z3050 = x3050
+	z3051 = x3051
+	z3052 = x3052
+	z3053 = x3053
+	z3054 = x3054
+	z3055 = x3055
+	z3056 = x3056
+	z3057 = x3057
+	z3058 = x3058
+	z3059 = x3059
+	z3060 = x3060
+	z3061 = x3061
+	z3062 = x3062
+	z3063 = x3063
+	z3064 = x3064
+	z3065 = x3065
+	z3066 = x3066
+	z3067 = x3067
+	z3068 = x3068
+	z3069 = x3069
+	z3070 = x3070
+	z3071 = x3071
+	z3072 = x3072
+	z3073 = x3073
+	z3074 = x3074
+	z3075 = x3075
+	z3076 = x3076
+	z3077 = x3077
+	z3078 = x3078
+	z3079 = x3079
+	z3080 = x3080
+	z3081 = x3081
+	z3082 = x3082
+	z3083 = x3083
+	z3084 = x3084
+	z3085 = x3085
+	z3086 = x3086
+	z3087 = x3087
+	z3088 = x3088
+	z3089 = x3089
+	z3090 = x3090
+	z3091 = x3091
+	z3092 = x3092
+	z3093 = x3093
+	z3094 = x3094
+	z3095 = x3095
+	z3096 = x3096
+	z3097 = x3097
+	z3098 = x3098
+	z3099 = x3099
+	z3100 = x3100
+	z3101 = x3101
+	z3102 = x3102
+	z3103 = x3103
+	z3104 = x3104
+	z3105 = x3105
+	z3106 = x3106
+	z3107 = x3107
+	z3108 = x3108
+	z3109 = x3109
+	z3110 = x3110
+	z3111 = x3111
+	z3112 = x3112
+	z3113 = x3113
+	z3114 = x3114
+	z3115 = x3115
+	z3116 = x3116
+	z3117 = x3117
+	z3118 = x3118
+	z3119 = x3119
+	z3120 = x3120
+	z3121 = x3121
+	z3122 = x3122
+	z3123 = x3123
+	z3124 = x3124
+	z3125 = x3125
+	z3126 = x3126
+	z3127 = x3127
+	z3128 = x3128
+	z3129 = x3129
+	z3130 = x3130
+	z3131 = x3131
+	z3132 = x3132
+	z3133 = x3133
+	z3134 = x3134
+	z3135 = x3135
+	z3136 = x3136
+	z3137 = x3137
+	z3138 = x3138
+	z3139 = x3139
+	z3140 = x3140
+	z3141 = x3141
+	z3142 = x3142
+	z3143 = x3143
+	z3144 = x3144
+	z3145 = x3145
+	z3146 = x3146
+	z3147 = x3147
+	z3148 = x3148
+	z3149 = x3149
+	z3150 = x3150
+	z3151 = x3151
+	z3152 = x3152
+	z3153 = x3153
+	z3154 = x3154
+	z3155 = x3155
+	z3156 = x3156
+	z3157 = x3157
+	z3158 = x3158
+	z3159 = x3159
+	z3160 = x3160
+	z3161 = x3161
+	z3162 = x3162
+	z3163 = x3163
+	z3164 = x3164
+	z3165 = x3165
+	z3166 = x3166
+	z3167 = x3167
+	z3168 = x3168
+	z3169 = x3169
+	z3170 = x3170
+	z3171 = x3171
+	z3172 = x3172
+	z3173 = x3173
+	z3174 = x3174
+	z3175 = x3175
+	z3176 = x3176
+	z3177 = x3177
+	z3178 = x3178
+	z3179 = x3179
+	z3180 = x3180
+	z3181 = x3181
+	z3182 = x3182
+	z3183 = x3183
+	z3184 = x3184
+	z3185 = x3185
+	z3186 = x3186
+	z3187 = x3187
+	z3188 = x3188
+	z3189 = x3189
+	z3190 = x3190
+	z3191 = x3191
+	z3192 = x3192
+	z3193 = x3193
+	z3194 = x3194
+	z3195 = x3195
+	z3196 = x3196
+	z3197 = x3197
+	z3198 = x3198
+	z3199 = x3199
+	z3200 = x3200
+	z3201 = x3201
+	z3202 = x3202
+	z3203 = x3203
+	z3204 = x3204
+	z3205 = x3205
+	z3206 = x3206
+	z3207 = x3207
+	z3208 = x3208
+	z3209 = x3209
+	z3210 = x3210
+	z3211 = x3211
+	z3212 = x3212
+	z3213 = x3213
+	z3214 = x3214
+	z3215 = x3215
+	z3216 = x3216
+	z3217 = x3217
+	z3218 = x3218
+	z3219 = x3219
+	z3220 = x3220
+	z3221 = x3221
+	z3222 = x3222
+	z3223 = x3223
+	z3224 = x3224
+	z3225 = x3225
+	z3226 = x3226
+	z3227 = x3227
+	z3228 = x3228
+	z3229 = x3229
+	z3230 = x3230
+	z3231 = x3231
+	z3232 = x3232
+	z3233 = x3233
+	z3234 = x3234
+	z3235 = x3235
+	z3236 = x3236
+	z3237 = x3237
+	z3238 = x3238
+	z3239 = x3239
+	z3240 = x3240
+	z3241 = x3241
+	z3242 = x3242
+	z3243 = x3243
+	z3244 = x3244
+	z3245 = x3245
+	z3246 = x3246
+	z3247 = x3247
+	z3248 = x3248
+	z3249 = x3249
+	z3250 = x3250
+	z3251 = x3251
+	z3252 = x3252
+	z3253 = x3253
+	z3254 = x3254
+	z3255 = x3255
+	z3256 = x3256
+	z3257 = x3257
+	z3258 = x3258
+	z3259 = x3259
+	z3260 = x3260
+	z3261 = x3261
+	z3262 = x3262
+	z3263 = x3263
+	z3264 = x3264
+	z3265 = x3265
+	z3266 = x3266
+	z3267 = x3267
+	z3268 = x3268
+	z3269 = x3269
+	z3270 = x3270
+	z3271 = x3271
+	z3272 = x3272
+	z3273 = x3273
+	z3274 = x3274
+	z3275 = x3275
+	z3276 = x3276
+	z3277 = x3277
+	z3278 = x3278
+	z3279 = x3279
+	z3280 = x3280
+	z3281 = x3281
+	z3282 = x3282
+	z3283 = x3283
+	z3284 = x3284
+	z3285 = x3285
+	z3286 = x3286
+	z3287 = x3287
+	z3288 = x3288
+	z3289 = x3289
+	z3290 = x3290
+	z3291 = x3291
+	z3292 = x3292
+	z3293 = x3293
+	z3294 = x3294
+	z3295 = x3295
+	z3296 = x3296
+	z3297 = x3297
+	z3298 = x3298
+	z3299 = x3299
+	z3300 = x3300
+	z3301 = x3301
+	z3302 = x3302
+	z3303 = x3303
+	z3304 = x3304
+	z3305 = x3305
+	z3306 = x3306
+	z3307 = x3307
+	z3308 = x3308
+	z3309 = x3309
+	z3310 = x3310
+	z3311 = x3311
+	z3312 = x3312
+	z3313 = x3313
+	z3314 = x3314
+	z3315 = x3315
+	z3316 = x3316
+	z3317 = x3317
+	z3318 = x3318
+	z3319 = x3319
+	z3320 = x3320
+	z3321 = x3321
+	z3322 = x3322
+	z3323 = x3323
+	z3324 = x3324
+	z3325 = x3325
+	z3326 = x3326
+	z3327 = x3327
+	z3328 = x3328
+	z3329 = x3329
+	z3330 = x3330
+	z3331 = x3331
+	z3332 = x3332
+	z3333 = x3333
+	z3334 = x3334
+	z3335 = x3335
+	z3336 = x3336
+	z3337 = x3337
+	z3338 = x3338
+	z3339 = x3339
+	z3340 = x3340
+	z3341 = x3341
+	z3342 = x3342
+	z3343 = x3343
+	z3344 = x3344
+	z3345 = x3345
+	z3346 = x3346
+	z3347 = x3347
+	z3348 = x3348
+	z3349 = x3349
+	z3350 = x3350
+	z3351 = x3351
+	z3352 = x3352
+	z3353 = x3353
+	z3354 = x3354
+	z3355 = x3355
+	z3356 = x3356
+	z3357 = x3357
+	z3358 = x3358
+	z3359 = x3359
+	z3360 = x3360
+	z3361 = x3361
+	z3362 = x3362
+	z3363 = x3363
+	z3364 = x3364
+	z3365 = x3365
+	z3366 = x3366
+	z3367 = x3367
+	z3368 = x3368
+	z3369 = x3369
+	z3370 = x3370
+	z3371 = x3371
+	z3372 = x3372
+	z3373 = x3373
+	z3374 = x3374
+	z3375 = x3375
+	z3376 = x3376
+	z3377 = x3377
+	z3378 = x3378
+	z3379 = x3379
+	z3380 = x3380
+	z3381 = x3381
+	z3382 = x3382
+	z3383 = x3383
+	z3384 = x3384
+	z3385 = x3385
+	z3386 = x3386
+	z3387 = x3387
+	z3388 = x3388
+	z3389 = x3389
+	z3390 = x3390
+	z3391 = x3391
+	z3392 = x3392
+	z3393 = x3393
+	z3394 = x3394
+	z3395 = x3395
+	z3396 = x3396
+	z3397 = x3397
+	z3398 = x3398
+	z3399 = x3399
+	z3400 = x3400
+	z3401 = x3401
+	z3402 = x3402
+	z3403 = x3403
+	z3404 = x3404
+	z3405 = x3405
+	z3406 = x3406
+	z3407 = x3407
+	z3408 = x3408
+	z3409 = x3409
+	z3410 = x3410
+	z3411 = x3411
+	z3412 = x3412
+	z3413 = x3413
+	z3414 = x3414
+	z3415 = x3415
+	z3416 = x3416
+	z3417 = x3417
+	z3418 = x3418
+	z3419 = x3419
+	z3420 = x3420
+	z3421 = x3421
+	z3422 = x3422
+	z3423 = x3423
+	z3424 = x3424
+	z3425 = x3425
+	z3426 = x3426
+	z3427 = x3427
+	z3428 = x3428
+	z3429 = x3429
+	z3430 = x3430
+	z3431 = x3431
+	z3432 = x3432
+	z3433 = x3433
+	z3434 = x3434
+	z3435 = x3435
+	z3436 = x3436
+	z3437 = x3437
+	z3438 = x3438
+	z3439 = x3439
+	z3440 = x3440
+	z3441 = x3441
+	z3442 = x3442
+	z3443 = x3443
+	z3444 = x3444
+	z3445 = x3445
+	z3446 = x3446
+	z3447 = x3447
+	z3448 = x3448
+	z3449 = x3449
+	z3450 = x3450
+	z3451 = x3451
+	z3452 = x3452
+	z3453 = x3453
+	z3454 = x3454
+	z3455 = x3455
+	z3456 = x3456
+	z3457 = x3457
+	z3458 = x3458
+	z3459 = x3459
+	z3460 = x3460
+	z3461 = x3461
+	z3462 = x3462
+	z3463 = x3463
+	z3464 = x3464
+	z3465 = x3465
+	z3466 = x3466
+	z3467 = x3467
+	z3468 = x3468
+	z3469 = x3469
+	z3470 = x3470
+	z3471 = x3471
+	z3472 = x3472
+	z3473 = x3473
+	z3474 = x3474
+	z3475 = x3475
+	z3476 = x3476
+	z3477 = x3477
+	z3478 = x3478
+	z3479 = x3479
+	z3480 = x3480
+	z3481 = x3481
+	z3482 = x3482
+	z3483 = x3483
+	z3484 = x3484
+	z3485 = x3485
+	z3486 = x3486
+	z3487 = x3487
+	z3488 = x3488
+	z3489 = x3489
+	z3490 = x3490
+	z3491 = x3491
+	z3492 = x3492
+	z3493 = x3493
+	z3494 = x3494
+	z3495 = x3495
+	z3496 = x3496
+	z3497 = x3497
+	z3498 = x3498
+	z3499 = x3499
+	z3500 = x3500
+	z3501 = x3501
+	z3502 = x3502
+	z3503 = x3503
+	z3504 = x3504
+	z3505 = x3505
+	z3506 = x3506
+	z3507 = x3507
+	z3508 = x3508
+	z3509 = x3509
+	z3510 = x3510
+	z3511 = x3511
+	z3512 = x3512
+	z3513 = x3513
+	z3514 = x3514
+	z3515 = x3515
+	z3516 = x3516
+	z3517 = x3517
+	z3518 = x3518
+	z3519 = x3519
+	z3520 = x3520
+	z3521 = x3521
+	z3522 = x3522
+	z3523 = x3523
+	z3524 = x3524
+	z3525 = x3525
+	z3526 = x3526
+	z3527 = x3527
+	z3528 = x3528
+	z3529 = x3529
+	z3530 = x3530
+	z3531 = x3531
+	z3532 = x3532
+	z3533 = x3533
+	z3534 = x3534
+	z3535 = x3535
+	z3536 = x3536
+	z3537 = x3537
+	z3538 = x3538
+	z3539 = x3539
+	z3540 = x3540
+	z3541 = x3541
+	z3542 = x3542
+	z3543 = x3543
+	z3544 = x3544
+	z3545 = x3545
+	z3546 = x3546
+	z3547 = x3547
+	z3548 = x3548
+	z3549 = x3549
+	z3550 = x3550
+	z3551 = x3551
+	z3552 = x3552
+	z3553 = x3553
+	z3554 = x3554
+	z3555 = x3555
+	z3556 = x3556
+	z3557 = x3557
+	z3558 = x3558
+	z3559 = x3559
+	z3560 = x3560
+	z3561 = x3561
+	z3562 = x3562
+	z3563 = x3563
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+	z3565 = x3565
+	z3566 = x3566
+	z3567 = x3567
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+	z3569 = x3569
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+	z3571 = x3571
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+	z3573 = x3573
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+	z3575 = x3575
+	z3576 = x3576
+	z3577 = x3577
+	z3578 = x3578
+	z3579 = x3579
+	z3580 = x3580
+	z3581 = x3581
+	z3582 = x3582
+	z3583 = x3583
+	z3584 = x3584
+	z3585 = x3585
+	z3586 = x3586
+	z3587 = x3587
+	z3588 = x3588
+	z3589 = x3589
+	z3590 = x3590
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+	z3592 = x3592
+	z3593 = x3593
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+	z3595 = x3595
+	z3596 = x3596
+	z3597 = x3597
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+	z3599 = x3599
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+	z3602 = x3602
+	z3603 = x3603
+	z3604 = x3604
+	z3605 = x3605
+	z3606 = x3606
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+	z3613 = x3613
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+	z3616 = x3616
+	z3617 = x3617
+	z3618 = x3618
+	z3619 = x3619
+	z3620 = x3620
+	z3621 = x3621
+	z3622 = x3622
+	z3623 = x3623
+	z3624 = x3624
+	z3625 = x3625
+	z3626 = x3626
+	z3627 = x3627
+	z3628 = x3628
+	z3629 = x3629
+	z3630 = x3630
+	z3631 = x3631
+	z3632 = x3632
+	z3633 = x3633
+	z3634 = x3634
+	z3635 = x3635
+	z3636 = x3636
+	z3637 = x3637
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+	z3639 = x3639
+	z3640 = x3640
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+	z3642 = x3642
+	z3643 = x3643
+	z3644 = x3644
+	z3645 = x3645
+	z3646 = x3646
+	z3647 = x3647
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+	z3651 = x3651
+	z3652 = x3652
+	z3653 = x3653
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+	z3655 = x3655
+	z3656 = x3656
+	z3657 = x3657
+	z3658 = x3658
+	z3659 = x3659
+	z3660 = x3660
+	z3661 = x3661
+	z3662 = x3662
+	z3663 = x3663
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+	z3665 = x3665
+	z3666 = x3666
+	z3667 = x3667
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+	z3669 = x3669
+	z3670 = x3670
+	z3671 = x3671
+	z3672 = x3672
+	z3673 = x3673
+	z3674 = x3674
+	z3675 = x3675
+	z3676 = x3676
+	z3677 = x3677
+	z3678 = x3678
+	z3679 = x3679
+	z3680 = x3680
+	z3681 = x3681
+	z3682 = x3682
+	z3683 = x3683
+	z3684 = x3684
+	z3685 = x3685
+	z3686 = x3686
+	z3687 = x3687
+	z3688 = x3688
+	z3689 = x3689
+	z3690 = x3690
+	z3691 = x3691
+	z3692 = x3692
+	z3693 = x3693
+	z3694 = x3694
+	z3695 = x3695
+	z3696 = x3696
+	z3697 = x3697
+	z3698 = x3698
+	z3699 = x3699
+	z3700 = x3700
+	z3701 = x3701
+	z3702 = x3702
+	z3703 = x3703
+	z3704 = x3704
+	z3705 = x3705
+	z3706 = x3706
+	z3707 = x3707
+	z3708 = x3708
+	z3709 = x3709
+	z3710 = x3710
+	z3711 = x3711
+	z3712 = x3712
+	z3713 = x3713
+	z3714 = x3714
+	z3715 = x3715
+	z3716 = x3716
+	z3717 = x3717
+	z3718 = x3718
+	z3719 = x3719
+	z3720 = x3720
+	z3721 = x3721
+	z3722 = x3722
+	z3723 = x3723
+	z3724 = x3724
+	z3725 = x3725
+	z3726 = x3726
+	z3727 = x3727
+	z3728 = x3728
+	z3729 = x3729
+	z3730 = x3730
+	z3731 = x3731
+	z3732 = x3732
+	z3733 = x3733
+	z3734 = x3734
+	z3735 = x3735
+	z3736 = x3736
+	z3737 = x3737
+	z3738 = x3738
+	z3739 = x3739
+	z3740 = x3740
+	z3741 = x3741
+	z3742 = x3742
+	z3743 = x3743
+	z3744 = x3744
+	z3745 = x3745
+	z3746 = x3746
+	z3747 = x3747
+	z3748 = x3748
+	z3749 = x3749
+	z3750 = x3750
+	z3751 = x3751
+	z3752 = x3752
+	z3753 = x3753
+	z3754 = x3754
+	z3755 = x3755
+	z3756 = x3756
+	z3757 = x3757
+	z3758 = x3758
+	z3759 = x3759
+	z3760 = x3760
+	z3761 = x3761
+	z3762 = x3762
+	z3763 = x3763
+	z3764 = x3764
+	z3765 = x3765
+	z3766 = x3766
+	z3767 = x3767
+	z3768 = x3768
+	z3769 = x3769
+	z3770 = x3770
+	z3771 = x3771
+	z3772 = x3772
+	z3773 = x3773
+	z3774 = x3774
+	z3775 = x3775
+	z3776 = x3776
+	z3777 = x3777
+	z3778 = x3778
+	z3779 = x3779
+	z3780 = x3780
+	z3781 = x3781
+	z3782 = x3782
+	z3783 = x3783
+	z3784 = x3784
+	z3785 = x3785
+	z3786 = x3786
+	z3787 = x3787
+	z3788 = x3788
+	z3789 = x3789
+	z3790 = x3790
+	z3791 = x3791
+	z3792 = x3792
+	z3793 = x3793
+	z3794 = x3794
+	z3795 = x3795
+	z3796 = x3796
+	z3797 = x3797
+	z3798 = x3798
+	z3799 = x3799
+	z3800 = x3800
+	z3801 = x3801
+	z3802 = x3802
+	z3803 = x3803
+	z3804 = x3804
+	z3805 = x3805
+	z3806 = x3806
+	z3807 = x3807
+	z3808 = x3808
+	z3809 = x3809
+	z3810 = x3810
+	z3811 = x3811
+	z3812 = x3812
+	z3813 = x3813
+	z3814 = x3814
+	z3815 = x3815
+	z3816 = x3816
+	z3817 = x3817
+	z3818 = x3818
+	z3819 = x3819
+	z3820 = x3820
+	z3821 = x3821
+	z3822 = x3822
+	z3823 = x3823
+	z3824 = x3824
+	z3825 = x3825
+	z3826 = x3826
+	z3827 = x3827
+	z3828 = x3828
+	z3829 = x3829
+	z3830 = x3830
+	z3831 = x3831
+	z3832 = x3832
+	z3833 = x3833
+	z3834 = x3834
+	z3835 = x3835
+	z3836 = x3836
+	z3837 = x3837
+	z3838 = x3838
+	z3839 = x3839
+	z3840 = x3840
+	z3841 = x3841
+	z3842 = x3842
+	z3843 = x3843
+	z3844 = x3844
+	z3845 = x3845
+	z3846 = x3846
+	z3847 = x3847
+	z3848 = x3848
+	z3849 = x3849
+	z3850 = x3850
+	z3851 = x3851
+	z3852 = x3852
+	z3853 = x3853
+	z3854 = x3854
+	z3855 = x3855
+	z3856 = x3856
+	z3857 = x3857
+	z3858 = x3858
+	z3859 = x3859
+	z3860 = x3860
+	z3861 = x3861
+	z3862 = x3862
+	z3863 = x3863
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+	z3865 = x3865
+	z3866 = x3866
+	z3867 = x3867
+	z3868 = x3868
+	z3869 = x3869
+	z3870 = x3870
+	z3871 = x3871
+	z3872 = x3872
+	z3873 = x3873
+	z3874 = x3874
+	z3875 = x3875
+	z3876 = x3876
+	z3877 = x3877
+	z3878 = x3878
+	z3879 = x3879
+	z3880 = x3880
+	z3881 = x3881
+	z3882 = x3882
+	z3883 = x3883
+	z3884 = x3884
+	z3885 = x3885
+	z3886 = x3886
+	z3887 = x3887
+	z3888 = x3888
+	z3889 = x3889
+	z3890 = x3890
+	z3891 = x3891
+	z3892 = x3892
+	z3893 = x3893
+	z3894 = x3894
+	z3895 = x3895
+	z3896 = x3896
+	z3897 = x3897
+	z3898 = x3898
+	z3899 = x3899
+	z3900 = x3900
+	z3901 = x3901
+	z3902 = x3902
+	z3903 = x3903
+	z3904 = x3904
+	z3905 = x3905
+	z3906 = x3906
+	z3907 = x3907
+	z3908 = x3908
+	z3909 = x3909
+	z3910 = x3910
+	z3911 = x3911
+	z3912 = x3912
+	z3913 = x3913
+	z3914 = x3914
+	z3915 = x3915
+	z3916 = x3916
+	z3917 = x3917
+	z3918 = x3918
+	z3919 = x3919
+	z3920 = x3920
+	z3921 = x3921
+	z3922 = x3922
+	z3923 = x3923
+	z3924 = x3924
+	z3925 = x3925
+	z3926 = x3926
+	z3927 = x3927
+	z3928 = x3928
+	z3929 = x3929
+	z3930 = x3930
+	z3931 = x3931
+	z3932 = x3932
+	z3933 = x3933
+	z3934 = x3934
+	z3935 = x3935
+	z3936 = x3936
+	z3937 = x3937
+	z3938 = x3938
+	z3939 = x3939
+	z3940 = x3940
+	z3941 = x3941
+	z3942 = x3942
+	z3943 = x3943
+	z3944 = x3944
+	z3945 = x3945
+	z3946 = x3946
+	z3947 = x3947
+	z3948 = x3948
+	z3949 = x3949
+	z3950 = x3950
+	z3951 = x3951
+	z3952 = x3952
+	z3953 = x3953
+	z3954 = x3954
+	z3955 = x3955
+	z3956 = x3956
+	z3957 = x3957
+	z3958 = x3958
+	z3959 = x3959
+	z3960 = x3960
+	z3961 = x3961
+	z3962 = x3962
+	z3963 = x3963
+	z3964 = x3964
+	z3965 = x3965
+	z3966 = x3966
+	z3967 = x3967
+	z3968 = x3968
+	z3969 = x3969
+	z3970 = x3970
+	z3971 = x3971
+	z3972 = x3972
+	z3973 = x3973
+	z3974 = x3974
+	z3975 = x3975
+	z3976 = x3976
+	z3977 = x3977
+	z3978 = x3978
+	z3979 = x3979
+	z3980 = x3980
+	z3981 = x3981
+	z3982 = x3982
+	z3983 = x3983
+	z3984 = x3984
+	z3985 = x3985
+	z3986 = x3986
+	z3987 = x3987
+	z3988 = x3988
+	z3989 = x3989
+	z3990 = x3990
+	z3991 = x3991
+	z3992 = x3992
+	z3993 = x3993
+	z3994 = x3994
+	z3995 = x3995
+	z3996 = x3996
+	z3997 = x3997
+	z3998 = x3998
+	z3999 = x3999
+	z4000 = x4000
+	z4001 = x4001
+	z4002 = x4002
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+	z4005 = x4005
+	z4006 = x4006
+	z4007 = x4007
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+	z4009 = x4009
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+	z4011 = x4011
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+	z4015 = x4015
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+	z4017 = x4017
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+	z4019 = x4019
+	z4020 = x4020
+	z4021 = x4021
+	z4022 = x4022
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+	z4024 = x4024
+	z4025 = x4025
+	z4026 = x4026
+	z4027 = x4027
+	z4028 = x4028
+	z4029 = x4029
+	z4030 = x4030
+	z4031 = x4031
+	z4032 = x4032
+	z4033 = x4033
+	z4034 = x4034
+	z4035 = x4035
+	z4036 = x4036
+	z4037 = x4037
+	z4038 = x4038
+	z4039 = x4039
+	z4040 = x4040
+	z4041 = x4041
+	z4042 = x4042
+	z4043 = x4043
+	z4044 = x4044
+	z4045 = x4045
+	z4046 = x4046
+	z4047 = x4047
+	z4048 = x4048
+	z4049 = x4049
+	z4050 = x4050
+	z4051 = x4051
+	z4052 = x4052
+	z4053 = x4053
+	z4054 = x4054
+	z4055 = x4055
+	z4056 = x4056
+	z4057 = x4057
+	z4058 = x4058
+	z4059 = x4059
+	z4060 = x4060
+	z4061 = x4061
+	z4062 = x4062
+	z4063 = x4063
+	z4064 = x4064
+	z4065 = x4065
+	z4066 = x4066
+	z4067 = x4067
+	z4068 = x4068
+	z4069 = x4069
+	z4070 = x4070
+	z4071 = x4071
+	z4072 = x4072
+	z4073 = x4073
+	z4074 = x4074
+	z4075 = x4075
+	z4076 = x4076
+	z4077 = x4077
+	z4078 = x4078
+	z4079 = x4079
+	z4080 = x4080
+	z4081 = x4081
+	z4082 = x4082
+	z4083 = x4083
+	z4084 = x4084
+	z4085 = x4085
+	z4086 = x4086
+	z4087 = x4087
+	z4088 = x4088
+	z4089 = x4089
+	z4090 = x4090
+	z4091 = x4091
+	z4092 = x4092
+	z4093 = x4093
+	z4094 = x4094
+	z4095 = x4095
+	z4096 = x4096
+	z4097 = x4097
+	z4098 = x4098
+	z4099 = x4099
+	z4100 = x4100
+	z4101 = x4101
+	z4102 = x4102
+	z4103 = x4103
+	z4104 = x4104
+	z4105 = x4105
+	z4106 = x4106
+	z4107 = x4107
+	z4108 = x4108
+	z4109 = x4109
+	z4110 = x4110
+	z4111 = x4111
+	z4112 = x4112
+	z4113 = x4113
+	z4114 = x4114
+	z4115 = x4115
+	z4116 = x4116
+	z4117 = x4117
+	z4118 = x4118
+	z4119 = x4119
+	z4120 = x4120
+	z4121 = x4121
+	z4122 = x4122
+	z4123 = x4123
+	z4124 = x4124
+	z4125 = x4125
+	z4126 = x4126
+	z4127 = x4127
+	z4128 = x4128
+	z4129 = x4129
+	z4130 = x4130
+	z4131 = x4131
+	z4132 = x4132
+	z4133 = x4133
+	z4134 = x4134
+	z4135 = x4135
+	z4136 = x4136
+	z4137 = x4137
+	z4138 = x4138
+	z4139 = x4139
+	z4140 = x4140
+	z4141 = x4141
+	z4142 = x4142
+	z4143 = x4143
+	z4144 = x4144
+	z4145 = x4145
+	z4146 = x4146
+	z4147 = x4147
+	z4148 = x4148
+	z4149 = x4149
+	z4150 = x4150
+	z4151 = x4151
+	z4152 = x4152
+	z4153 = x4153
+	z4154 = x4154
+	z4155 = x4155
+	z4156 = x4156
+	z4157 = x4157
+	z4158 = x4158
+	z4159 = x4159
+	z4160 = x4160
+	z4161 = x4161
+	z4162 = x4162
+	z4163 = x4163
+	z4164 = x4164
+	z4165 = x4165
+	z4166 = x4166
+	z4167 = x4167
+	z4168 = x4168
+	z4169 = x4169
+	z4170 = x4170
+	z4171 = x4171
+	z4172 = x4172
+	z4173 = x4173
+	z4174 = x4174
+	z4175 = x4175
+	z4176 = x4176
+	z4177 = x4177
+	z4178 = x4178
+	z4179 = x4179
+	z4180 = x4180
+	z4181 = x4181
+	z4182 = x4182
+	z4183 = x4183
+	z4184 = x4184
+	z4185 = x4185
+	z4186 = x4186
+	z4187 = x4187
+	z4188 = x4188
+	z4189 = x4189
+	z4190 = x4190
+	z4191 = x4191
+	z4192 = x4192
+	z4193 = x4193
+	z4194 = x4194
+	z4195 = x4195
+	z4196 = x4196
+	z4197 = x4197
+	z4198 = x4198
+	z4199 = x4199
+	z4200 = x4200
+	z4201 = x4201
+	z4202 = x4202
+	z4203 = x4203
+	z4204 = x4204
+	z4205 = x4205
+	z4206 = x4206
+	z4207 = x4207
+	z4208 = x4208
+	z4209 = x4209
+	z4210 = x4210
+	z4211 = x4211
+	z4212 = x4212
+	z4213 = x4213
+	z4214 = x4214
+	z4215 = x4215
+	z4216 = x4216
+	z4217 = x4217
+	z4218 = x4218
+	z4219 = x4219
+	z4220 = x4220
+	z4221 = x4221
+	z4222 = x4222
+	z4223 = x4223
+	z4224 = x4224
+	z4225 = x4225
+	z4226 = x4226
+	z4227 = x4227
+	z4228 = x4228
+	z4229 = x4229
+	z4230 = x4230
+	z4231 = x4231
+	z4232 = x4232
+	z4233 = x4233
+	z4234 = x4234
+	z4235 = x4235
+	z4236 = x4236
+	z4237 = x4237
+	z4238 = x4238
+	z4239 = x4239
+	z4240 = x4240
+	z4241 = x4241
+	z4242 = x4242
+	z4243 = x4243
+	z4244 = x4244
+	z4245 = x4245
+	z4246 = x4246
+	z4247 = x4247
+	z4248 = x4248
+	z4249 = x4249
+	z4250 = x4250
+	z4251 = x4251
+	z4252 = x4252
+	z4253 = x4253
+	z4254 = x4254
+	z4255 = x4255
+	z4256 = x4256
+	z4257 = x4257
+	z4258 = x4258
+	z4259 = x4259
+	z4260 = x4260
+	z4261 = x4261
+	z4262 = x4262
+	z4263 = x4263
+	z4264 = x4264
+	z4265 = x4265
+	z4266 = x4266
+	z4267 = x4267
+	z4268 = x4268
+	z4269 = x4269
+	z4270 = x4270
+	z4271 = x4271
+	z4272 = x4272
+	z4273 = x4273
+	z4274 = x4274
+	z4275 = x4275
+	z4276 = x4276
+	z4277 = x4277
+	z4278 = x4278
+	z4279 = x4279
+	z4280 = x4280
+	z4281 = x4281
+	z4282 = x4282
+	z4283 = x4283
+	z4284 = x4284
+	z4285 = x4285
+	z4286 = x4286
+	z4287 = x4287
+	z4288 = x4288
+	z4289 = x4289
+	z4290 = x4290
+	z4291 = x4291
+	z4292 = x4292
+	z4293 = x4293
+	z4294 = x4294
+	z4295 = x4295
+	z4296 = x4296
+	z4297 = x4297
+	z4298 = x4298
+	z4299 = x4299
+	z4300 = x4300
+	z4301 = x4301
+	z4302 = x4302
+	z4303 = x4303
+	z4304 = x4304
+	z4305 = x4305
+	z4306 = x4306
+	z4307 = x4307
+	z4308 = x4308
+	z4309 = x4309
+	z4310 = x4310
+	z4311 = x4311
+	z4312 = x4312
+	z4313 = x4313
+	z4314 = x4314
+	z4315 = x4315
+	z4316 = x4316
+	z4317 = x4317
+	z4318 = x4318
+	z4319 = x4319
+	z4320 = x4320
+	z4321 = x4321
+	z4322 = x4322
+	z4323 = x4323
+	z4324 = x4324
+	z4325 = x4325
+	z4326 = x4326
+	z4327 = x4327
+	z4328 = x4328
+	z4329 = x4329
+	z4330 = x4330
+	z4331 = x4331
+	z4332 = x4332
+	z4333 = x4333
+	z4334 = x4334
+	z4335 = x4335
+	z4336 = x4336
+	z4337 = x4337
+	z4338 = x4338
+	z4339 = x4339
+	z4340 = x4340
+	z4341 = x4341
+	z4342 = x4342
+	z4343 = x4343
+	z4344 = x4344
+	z4345 = x4345
+	z4346 = x4346
+	z4347 = x4347
+	z4348 = x4348
+	z4349 = x4349
+	z4350 = x4350
+	z4351 = x4351
+	z4352 = x4352
+	z4353 = x4353
+	z4354 = x4354
+	z4355 = x4355
+	z4356 = x4356
+	z4357 = x4357
+	z4358 = x4358
+	z4359 = x4359
+	z4360 = x4360
+	z4361 = x4361
+	z4362 = x4362
+	z4363 = x4363
+	z4364 = x4364
+	z4365 = x4365
+	z4366 = x4366
+	z4367 = x4367
+	z4368 = x4368
+	z4369 = x4369
+	z4370 = x4370
+	z4371 = x4371
+	z4372 = x4372
+	z4373 = x4373
+	z4374 = x4374
+	z4375 = x4375
+	z4376 = x4376
+	z4377 = x4377
+	z4378 = x4378
+	z4379 = x4379
+	z4380 = x4380
+	z4381 = x4381
+	z4382 = x4382
+	z4383 = x4383
+	z4384 = x4384
+	z4385 = x4385
+	z4386 = x4386
+	z4387 = x4387
+	z4388 = x4388
+	z4389 = x4389
+	z4390 = x4390
+	z4391 = x4391
+	z4392 = x4392
+	z4393 = x4393
+	z4394 = x4394
+	z4395 = x4395
+	z4396 = x4396
+	z4397 = x4397
+	z4398 = x4398
+	z4399 = x4399
+	z4400 = x4400
+	z4401 = x4401
+	z4402 = x4402
+	z4403 = x4403
+	z4404 = x4404
+	z4405 = x4405
+	z4406 = x4406
+	z4407 = x4407
+	z4408 = x4408
+	z4409 = x4409
+	z4410 = x4410
+	z4411 = x4411
+	z4412 = x4412
+	z4413 = x4413
+	z4414 = x4414
+	z4415 = x4415
+	z4416 = x4416
+	z4417 = x4417
+	z4418 = x4418
+	z4419 = x4419
+	z4420 = x4420
+	z4421 = x4421
+	z4422 = x4422
+	z4423 = x4423
+	z4424 = x4424
+	z4425 = x4425
+	z4426 = x4426
+	z4427 = x4427
+	z4428 = x4428
+	z4429 = x4429
+	z4430 = x4430
+	z4431 = x4431
+	z4432 = x4432
+	z4433 = x4433
+	z4434 = x4434
+	z4435 = x4435
+	z4436 = x4436
+	z4437 = x4437
+	z4438 = x4438
+	z4439 = x4439
+	z4440 = x4440
+	z4441 = x4441
+	z4442 = x4442
+	z4443 = x4443
+	z4444 = x4444
+	z4445 = x4445
+	z4446 = x4446
+	z4447 = x4447
+	z4448 = x4448
+	z4449 = x4449
+	z4450 = x4450
+	z4451 = x4451
+	z4452 = x4452
+	z4453 = x4453
+	z4454 = x4454
+	z4455 = x4455
+	z4456 = x4456
+	z4457 = x4457
+	z4458 = x4458
+	z4459 = x4459
+	z4460 = x4460
+	z4461 = x4461
+	z4462 = x4462
+	z4463 = x4463
+	z4464 = x4464
+	z4465 = x4465
+	z4466 = x4466
+	z4467 = x4467
+	z4468 = x4468
+	z4469 = x4469
+	z4470 = x4470
+	z4471 = x4471
+	z4472 = x4472
+	z4473 = x4473
+	z4474 = x4474
+	z4475 = x4475
+	z4476 = x4476
+	z4477 = x4477
+	z4478 = x4478
+	z4479 = x4479
+	z4480 = x4480
+	z4481 = x4481
+	z4482 = x4482
+	z4483 = x4483
+	z4484 = x4484
+	z4485 = x4485
+	z4486 = x4486
+	z4487 = x4487
+	z4488 = x4488
+	z4489 = x4489
+	z4490 = x4490
+	z4491 = x4491
+	z4492 = x4492
+	z4493 = x4493
+	z4494 = x4494
+	z4495 = x4495
+	z4496 = x4496
+	z4497 = x4497
+	z4498 = x4498
+	z4499 = x4499
+	z4500 = x4500
+	z4501 = x4501
+	z4502 = x4502
+	z4503 = x4503
+	z4504 = x4504
+	z4505 = x4505
+	z4506 = x4506
+	z4507 = x4507
+	z4508 = x4508
+	z4509 = x4509
+	z4510 = x4510
+	z4511 = x4511
+	z4512 = x4512
+	z4513 = x4513
+	z4514 = x4514
+	z4515 = x4515
+	z4516 = x4516
+	z4517 = x4517
+	z4518 = x4518
+	z4519 = x4519
+	z4520 = x4520
+	z4521 = x4521
+	z4522 = x4522
+	z4523 = x4523
+	z4524 = x4524
+	z4525 = x4525
+	z4526 = x4526
+	z4527 = x4527
+	z4528 = x4528
+	z4529 = x4529
+	z4530 = x4530
+	z4531 = x4531
+	z4532 = x4532
+	z4533 = x4533
+	z4534 = x4534
+	z4535 = x4535
+	z4536 = x4536
+	z4537 = x4537
+	z4538 = x4538
+	z4539 = x4539
+	z4540 = x4540
+	z4541 = x4541
+	z4542 = x4542
+	z4543 = x4543
+	z4544 = x4544
+	z4545 = x4545
+	z4546 = x4546
+	z4547 = x4547
+	z4548 = x4548
+	z4549 = x4549
+	z4550 = x4550
+	z4551 = x4551
+	z4552 = x4552
+	z4553 = x4553
+	z4554 = x4554
+	z4555 = x4555
+	z4556 = x4556
+	z4557 = x4557
+	z4558 = x4558
+	z4559 = x4559
+	z4560 = x4560
+	z4561 = x4561
+	z4562 = x4562
+	z4563 = x4563
+	z4564 = x4564
+	z4565 = x4565
+	z4566 = x4566
+	z4567 = x4567
+	z4568 = x4568
+	z4569 = x4569
+	z4570 = x4570
+	z4571 = x4571
+	z4572 = x4572
+	z4573 = x4573
+	z4574 = x4574
+	z4575 = x4575
+	z4576 = x4576
+	z4577 = x4577
+	z4578 = x4578
+	z4579 = x4579
+	z4580 = x4580
+	z4581 = x4581
+	z4582 = x4582
+	z4583 = x4583
+	z4584 = x4584
+	z4585 = x4585
+	z4586 = x4586
+	z4587 = x4587
+	z4588 = x4588
+	z4589 = x4589
+	z4590 = x4590
+	z4591 = x4591
+	z4592 = x4592
+	z4593 = x4593
+	z4594 = x4594
+	z4595 = x4595
+	z4596 = x4596
+	z4597 = x4597
+	z4598 = x4598
+	z4599 = x4599
+	z4600 = x4600
+	z4601 = x4601
+	z4602 = x4602
+	z4603 = x4603
+	z4604 = x4604
+	z4605 = x4605
+	z4606 = x4606
+	z4607 = x4607
+	z4608 = x4608
+	z4609 = x4609
+	z4610 = x4610
+	z4611 = x4611
+	z4612 = x4612
+	z4613 = x4613
+	z4614 = x4614
+	z4615 = x4615
+	z4616 = x4616
+	z4617 = x4617
+	z4618 = x4618
+	z4619 = x4619
+	z4620 = x4620
+	z4621 = x4621
+	z4622 = x4622
+	z4623 = x4623
+	z4624 = x4624
+	z4625 = x4625
+	z4626 = x4626
+	z4627 = x4627
+	z4628 = x4628
+	z4629 = x4629
+	z4630 = x4630
+	z4631 = x4631
+	z4632 = x4632
+	z4633 = x4633
+	z4634 = x4634
+	z4635 = x4635
+	z4636 = x4636
+	z4637 = x4637
+	z4638 = x4638
+	z4639 = x4639
+	z4640 = x4640
+	z4641 = x4641
+	z4642 = x4642
+	z4643 = x4643
+	z4644 = x4644
+	z4645 = x4645
+	z4646 = x4646
+	z4647 = x4647
+	z4648 = x4648
+	z4649 = x4649
+	z4650 = x4650
+	z4651 = x4651
+	z4652 = x4652
+	z4653 = x4653
+	z4654 = x4654
+	z4655 = x4655
+	z4656 = x4656
+	z4657 = x4657
+	z4658 = x4658
+	z4659 = x4659
+	z4660 = x4660
+	z4661 = x4661
+	z4662 = x4662
+	z4663 = x4663
+	z4664 = x4664
+	z4665 = x4665
+	z4666 = x4666
+	z4667 = x4667
+	z4668 = x4668
+	z4669 = x4669
+	z4670 = x4670
+	z4671 = x4671
+	z4672 = x4672
+	z4673 = x4673
+	z4674 = x4674
+	z4675 = x4675
+	z4676 = x4676
+	z4677 = x4677
+	z4678 = x4678
+	z4679 = x4679
+	z4680 = x4680
+	z4681 = x4681
+	z4682 = x4682
+	z4683 = x4683
+	z4684 = x4684
+	z4685 = x4685
+	z4686 = x4686
+	z4687 = x4687
+	z4688 = x4688
+	z4689 = x4689
+	z4690 = x4690
+	z4691 = x4691
+	z4692 = x4692
+	z4693 = x4693
+	z4694 = x4694
+	z4695 = x4695
+	z4696 = x4696
+	z4697 = x4697
+	z4698 = x4698
+	z4699 = x4699
+	z4700 = x4700
+	z4701 = x4701
+	z4702 = x4702
+	z4703 = x4703
+	z4704 = x4704
+	z4705 = x4705
+	z4706 = x4706
+	z4707 = x4707
+	z4708 = x4708
+	z4709 = x4709
+	z4710 = x4710
+	z4711 = x4711
+	z4712 = x4712
+	z4713 = x4713
+	z4714 = x4714
+	z4715 = x4715
+	z4716 = x4716
+	z4717 = x4717
+	z4718 = x4718
+	z4719 = x4719
+	z4720 = x4720
+	z4721 = x4721
+	z4722 = x4722
+	z4723 = x4723
+	z4724 = x4724
+	z4725 = x4725
+	z4726 = x4726
+	z4727 = x4727
+	z4728 = x4728
+	z4729 = x4729
+	z4730 = x4730
+	z4731 = x4731
+	z4732 = x4732
+	z4733 = x4733
+	z4734 = x4734
+	z4735 = x4735
+	z4736 = x4736
+	z4737 = x4737
+	z4738 = x4738
+	z4739 = x4739
+	z4740 = x4740
+	z4741 = x4741
+	z4742 = x4742
+	z4743 = x4743
+	z4744 = x4744
+	z4745 = x4745
+	z4746 = x4746
+	z4747 = x4747
+	z4748 = x4748
+	z4749 = x4749
+	z4750 = x4750
+	z4751 = x4751
+	z4752 = x4752
+	z4753 = x4753
+	z4754 = x4754
+	z4755 = x4755
+	z4756 = x4756
+	z4757 = x4757
+	z4758 = x4758
+	z4759 = x4759
+	z4760 = x4760
+	z4761 = x4761
+	z4762 = x4762
+	z4763 = x4763
+	z4764 = x4764
+	z4765 = x4765
+	z4766 = x4766
+	z4767 = x4767
+	z4768 = x4768
+	z4769 = x4769
+	z4770 = x4770
+	z4771 = x4771
+	z4772 = x4772
+	z4773 = x4773
+	z4774 = x4774
+	z4775 = x4775
+	z4776 = x4776
+	z4777 = x4777
+	z4778 = x4778
+	z4779 = x4779
+	z4780 = x4780
+	z4781 = x4781
+	z4782 = x4782
+	z4783 = x4783
+	z4784 = x4784
+	z4785 = x4785
+	z4786 = x4786
+	z4787 = x4787
+	z4788 = x4788
+	z4789 = x4789
+	z4790 = x4790
+	z4791 = x4791
+	z4792 = x4792
+	z4793 = x4793
+	z4794 = x4794
+	z4795 = x4795
+	z4796 = x4796
+	z4797 = x4797
+	z4798 = x4798
+	z4799 = x4799
+	z4800 = x4800
+	z4801 = x4801
+	z4802 = x4802
+	z4803 = x4803
+	z4804 = x4804
+	z4805 = x4805
+	z4806 = x4806
+	z4807 = x4807
+	z4808 = x4808
+	z4809 = x4809
+	z4810 = x4810
+	z4811 = x4811
+	z4812 = x4812
+	z4813 = x4813
+	z4814 = x4814
+	z4815 = x4815
+	z4816 = x4816
+	z4817 = x4817
+	z4818 = x4818
+	z4819 = x4819
+	z4820 = x4820
+	z4821 = x4821
+	z4822 = x4822
+	z4823 = x4823
+	z4824 = x4824
+	z4825 = x4825
+	z4826 = x4826
+	z4827 = x4827
+	z4828 = x4828
+	z4829 = x4829
+	z4830 = x4830
+	z4831 = x4831
+	z4832 = x4832
+	z4833 = x4833
+	z4834 = x4834
+	z4835 = x4835
+	z4836 = x4836
+	z4837 = x4837
+	z4838 = x4838
+	z4839 = x4839
+	z4840 = x4840
+	z4841 = x4841
+	z4842 = x4842
+	z4843 = x4843
+	z4844 = x4844
+	z4845 = x4845
+	z4846 = x4846
+	z4847 = x4847
+	z4848 = x4848
+	z4849 = x4849
+	z4850 = x4850
+	z4851 = x4851
+	z4852 = x4852
+	z4853 = x4853
+	z4854 = x4854
+	z4855 = x4855
+	z4856 = x4856
+	z4857 = x4857
+	z4858 = x4858
+	z4859 = x4859
+	z4860 = x4860
+	z4861 = x4861
+	z4862 = x4862
+	z4863 = x4863
+	z4864 = x4864
+	z4865 = x4865
+	z4866 = x4866
+	z4867 = x4867
+	z4868 = x4868
+	z4869 = x4869
+	z4870 = x4870
+	z4871 = x4871
+	z4872 = x4872
+	z4873 = x4873
+	z4874 = x4874
+	z4875 = x4875
+	z4876 = x4876
+	z4877 = x4877
+	z4878 = x4878
+	z4879 = x4879
+	z4880 = x4880
+	z4881 = x4881
+	z4882 = x4882
+	z4883 = x4883
+	z4884 = x4884
+	z4885 = x4885
+	z4886 = x4886
+	z4887 = x4887
+	z4888 = x4888
+	z4889 = x4889
+	z4890 = x4890
+	z4891 = x4891
+	z4892 = x4892
+	z4893 = x4893
+	z4894 = x4894
+	z4895 = x4895
+	z4896 = x4896
+	z4897 = x4897
+	z4898 = x4898
+	z4899 = x4899
+	z4900 = x4900
+	z4901 = x4901
+	z4902 = x4902
+	z4903 = x4903
+	z4904 = x4904
+	z4905 = x4905
+	z4906 = x4906
+	z4907 = x4907
+	z4908 = x4908
+	z4909 = x4909
+	z4910 = x4910
+	z4911 = x4911
+	z4912 = x4912
+	z4913 = x4913
+	z4914 = x4914
+	z4915 = x4915
+	z4916 = x4916
+	z4917 = x4917
+	z4918 = x4918
+	z4919 = x4919
+	z4920 = x4920
+	z4921 = x4921
+	z4922 = x4922
+	z4923 = x4923
+	z4924 = x4924
+	z4925 = x4925
+	z4926 = x4926
+	z4927 = x4927
+	z4928 = x4928
+	z4929 = x4929
+	z4930 = x4930
+	z4931 = x4931
+	z4932 = x4932
+	z4933 = x4933
+	z4934 = x4934
+	z4935 = x4935
+	z4936 = x4936
+	z4937 = x4937
+	z4938 = x4938
+	z4939 = x4939
+	z4940 = x4940
+	z4941 = x4941
+	z4942 = x4942
+	z4943 = x4943
+	z4944 = x4944
+	z4945 = x4945
+	z4946 = x4946
+	z4947 = x4947
+	z4948 = x4948
+	z4949 = x4949
+	z4950 = x4950
+	z4951 = x4951
+	z4952 = x4952
+	z4953 = x4953
+	z4954 = x4954
+	z4955 = x4955
+	z4956 = x4956
+	z4957 = x4957
+	z4958 = x4958
+	z4959 = x4959
+	z4960 = x4960
+	z4961 = x4961
+	z4962 = x4962
+	z4963 = x4963
+	z4964 = x4964
+	z4965 = x4965
+	z4966 = x4966
+	z4967 = x4967
+	z4968 = x4968
+	z4969 = x4969
+	z4970 = x4970
+	z4971 = x4971
+	z4972 = x4972
+	z4973 = x4973
+	z4974 = x4974
+	z4975 = x4975
+	z4976 = x4976
+	z4977 = x4977
+	z4978 = x4978
+	z4979 = x4979
+	z4980 = x4980
+	z4981 = x4981
+	z4982 = x4982
+	z4983 = x4983
+	z4984 = x4984
+	z4985 = x4985
+	z4986 = x4986
+	z4987 = x4987
+	z4988 = x4988
+	z4989 = x4989
+	z4990 = x4990
+	z4991 = x4991
+	z4992 = x4992
+	z4993 = x4993
+	z4994 = x4994
+	z4995 = x4995
+	z4996 = x4996
+	z4997 = x4997
+	z4998 = x4998
+	z4999 = x4999
+	z5000 = x5000
+	z5001 = x5001
+	z5002 = x5002
+	z5003 = x5003
+	z5004 = x5004
+	z5005 = x5005
+	z5006 = x5006
+	z5007 = x5007
+	z5008 = x5008
+	z5009 = x5009
+	z5010 = x5010
+	z5011 = x5011
+	z5012 = x5012
+	z5013 = x5013
+	z5014 = x5014
+	z5015 = x5015
+	z5016 = x5016
+	z5017 = x5017
+	z5018 = x5018
+	z5019 = x5019
+	z5020 = x5020
+	z5021 = x5021
+	z5022 = x5022
+	z5023 = x5023
+	z5024 = x5024
+	z5025 = x5025
+	z5026 = x5026
+	z5027 = x5027
+	z5028 = x5028
+	z5029 = x5029
+	z5030 = x5030
+	z5031 = x5031
+	z5032 = x5032
+	z5033 = x5033
+	z5034 = x5034
+	z5035 = x5035
+	z5036 = x5036
+	z5037 = x5037
+	z5038 = x5038
+	z5039 = x5039
+	z5040 = x5040
+	z5041 = x5041
+	z5042 = x5042
+	z5043 = x5043
+	z5044 = x5044
+	z5045 = x5045
+	z5046 = x5046
+	z5047 = x5047
+	z5048 = x5048
+	z5049 = x5049
+	z5050 = x5050
+	z5051 = x5051
+	z5052 = x5052
+	z5053 = x5053
+	z5054 = x5054
+	z5055 = x5055
+	z5056 = x5056
+	z5057 = x5057
+	z5058 = x5058
+	z5059 = x5059
+	z5060 = x5060
+	z5061 = x5061
+	z5062 = x5062
+	z5063 = x5063
+	z5064 = x5064
+	z5065 = x5065
+	z5066 = x5066
+	z5067 = x5067
+	z5068 = x5068
+	z5069 = x5069
+	z5070 = x5070
+	z5071 = x5071
+	z5072 = x5072
+	z5073 = x5073
+	z5074 = x5074
+	z5075 = x5075
+	z5076 = x5076
+	z5077 = x5077
+	z5078 = x5078
+	z5079 = x5079
+	z5080 = x5080
+	z5081 = x5081
+	z5082 = x5082
+	z5083 = x5083
+	z5084 = x5084
+	z5085 = x5085
+	z5086 = x5086
+	z5087 = x5087
+	z5088 = x5088
+	z5089 = x5089
+	z5090 = x5090
+	z5091 = x5091
+	z5092 = x5092
+	z5093 = x5093
+	z5094 = x5094
+	z5095 = x5095
+	z5096 = x5096
+	z5097 = x5097
+	z5098 = x5098
+	z5099 = x5099
+	z5100 = x5100
+	z5101 = x5101
+	z5102 = x5102
+	z5103 = x5103
+	z5104 = x5104
+	z5105 = x5105
+	z5106 = x5106
+	z5107 = x5107
+	z5108 = x5108
+	z5109 = x5109
+	z5110 = x5110
+	z5111 = x5111
+	z5112 = x5112
+	z5113 = x5113
+	z5114 = x5114
+	z5115 = x5115
+	z5116 = x5116
+	z5117 = x5117
+	z5118 = x5118
+	z5119 = x5119
+	z5120 = x5120
+	z5121 = x5121
+	z5122 = x5122
+	z5123 = x5123
+	z5124 = x5124
+	z5125 = x5125
+	z5126 = x5126
+	z5127 = x5127
+	z5128 = x5128
+	z5129 = x5129
+	z5130 = x5130
+	z5131 = x5131
+	z5132 = x5132
+	z5133 = x5133
+	z5134 = x5134
+	z5135 = x5135
+	z5136 = x5136
+	z5137 = x5137
+	z5138 = x5138
+	z5139 = x5139
+	z5140 = x5140
+	z5141 = x5141
+	z5142 = x5142
+	z5143 = x5143
+	z5144 = x5144
+	z5145 = x5145
+	z5146 = x5146
+	z5147 = x5147
+	z5148 = x5148
+	z5149 = x5149
+	z5150 = x5150
+	z5151 = x5151
+	z5152 = x5152
+	z5153 = x5153
+	z5154 = x5154
+	z5155 = x5155
+	z5156 = x5156
+	z5157 = x5157
+	z5158 = x5158
+	z5159 = x5159
+	z5160 = x5160
+	z5161 = x5161
+	z5162 = x5162
+	z5163 = x5163
+	z5164 = x5164
+	z5165 = x5165
+	z5166 = x5166
+	z5167 = x5167
+	z5168 = x5168
+	z5169 = x5169
+	z5170 = x5170
+	z5171 = x5171
+	z5172 = x5172
+	z5173 = x5173
+	z5174 = x5174
+	z5175 = x5175
+	z5176 = x5176
+	z5177 = x5177
+	z5178 = x5178
+	z5179 = x5179
+	z5180 = x5180
+	z5181 = x5181
+	z5182 = x5182
+	z5183 = x5183
+	z5184 = x5184
+	z5185 = x5185
+	z5186 = x5186
+	z5187 = x5187
+	z5188 = x5188
+	z5189 = x5189
+	z5190 = x5190
+	z5191 = x5191
+	z5192 = x5192
+	z5193 = x5193
+	z5194 = x5194
+	z5195 = x5195
+	z5196 = x5196
+	z5197 = x5197
+	z5198 = x5198
+	z5199 = x5199
+	z5200 = x5200
+	z5201 = x5201
+	z5202 = x5202
+	z5203 = x5203
+	z5204 = x5204
+	z5205 = x5205
+	z5206 = x5206
+	z5207 = x5207
+	z5208 = x5208
+	z5209 = x5209
+	z5210 = x5210
+	z5211 = x5211
+	z5212 = x5212
+	z5213 = x5213
+	z5214 = x5214
+	z5215 = x5215
+	z5216 = x5216
+	z5217 = x5217
+	z5218 = x5218
+	z5219 = x5219
+	z5220 = x5220
+	z5221 = x5221
+	z5222 = x5222
+	z5223 = x5223
+	z5224 = x5224
+	z5225 = x5225
+	z5226 = x5226
+	z5227 = x5227
+	z5228 = x5228
+	z5229 = x5229
+	z5230 = x5230
+	z5231 = x5231
+	z5232 = x5232
+	z5233 = x5233
+	z5234 = x5234
+	z5235 = x5235
+	z5236 = x5236
+	z5237 = x5237
+	z5238 = x5238
+	z5239 = x5239
+	z5240 = x5240
+	z5241 = x5241
+	z5242 = x5242
+	z5243 = x5243
+	z5244 = x5244
+	z5245 = x5245
+	z5246 = x5246
+	z5247 = x5247
+	z5248 = x5248
+	z5249 = x5249
+	z5250 = x5250
+	z5251 = x5251
+	z5252 = x5252
+	z5253 = x5253
+	z5254 = x5254
+	z5255 = x5255
+	z5256 = x5256
+	z5257 = x5257
+	z5258 = x5258
+	z5259 = x5259
+	z5260 = x5260
+	z5261 = x5261
+	z5262 = x5262
+	z5263 = x5263
+	z5264 = x5264
+	z5265 = x5265
+	z5266 = x5266
+	z5267 = x5267
+	z5268 = x5268
+	z5269 = x5269
+	z5270 = x5270
+	z5271 = x5271
+	z5272 = x5272
+	z5273 = x5273
+	z5274 = x5274
+	z5275 = x5275
+	z5276 = x5276
+	z5277 = x5277
+	z5278 = x5278
+	z5279 = x5279
+	z5280 = x5280
+	z5281 = x5281
+	z5282 = x5282
+	z5283 = x5283
+	z5284 = x5284
+	z5285 = x5285
+	z5286 = x5286
+	z5287 = x5287
+	z5288 = x5288
+	z5289 = x5289
+	z5290 = x5290
+	z5291 = x5291
+	z5292 = x5292
+	z5293 = x5293
+	z5294 = x5294
+	z5295 = x5295
+	z5296 = x5296
+	z5297 = x5297
+	z5298 = x5298
+	z5299 = x5299
+	z5300 = x5300
+	z5301 = x5301
+	z5302 = x5302
+	z5303 = x5303
+	z5304 = x5304
+	z5305 = x5305
+	z5306 = x5306
+	z5307 = x5307
+	z5308 = x5308
+	z5309 = x5309
+	z5310 = x5310
+	z5311 = x5311
+	z5312 = x5312
+	z5313 = x5313
+	z5314 = x5314
+	z5315 = x5315
+	z5316 = x5316
+	z5317 = x5317
+	z5318 = x5318
+	z5319 = x5319
+	z5320 = x5320
+	z5321 = x5321
+	z5322 = x5322
+	z5323 = x5323
+	z5324 = x5324
+	z5325 = x5325
+	z5326 = x5326
+	z5327 = x5327
+	z5328 = x5328
+	z5329 = x5329
+	z5330 = x5330
+	z5331 = x5331
+	z5332 = x5332
+	z5333 = x5333
+	z5334 = x5334
+	z5335 = x5335
+	z5336 = x5336
+	z5337 = x5337
+	z5338 = x5338
+	z5339 = x5339
+	z5340 = x5340
+	z5341 = x5341
+	z5342 = x5342
+	z5343 = x5343
+	z5344 = x5344
+	z5345 = x5345
+	z5346 = x5346
+	z5347 = x5347
+	z5348 = x5348
+	z5349 = x5349
+	z5350 = x5350
+	z5351 = x5351
+	z5352 = x5352
+	z5353 = x5353
+	z5354 = x5354
+	z5355 = x5355
+	z5356 = x5356
+	z5357 = x5357
+	z5358 = x5358
+	z5359 = x5359
+	z5360 = x5360
+	z5361 = x5361
+	z5362 = x5362
+	z5363 = x5363
+	z5364 = x5364
+	z5365 = x5365
+	z5366 = x5366
+	z5367 = x5367
+	z5368 = x5368
+	z5369 = x5369
+	z5370 = x5370
+	z5371 = x5371
+	z5372 = x5372
+	z5373 = x5373
+	z5374 = x5374
+	z5375 = x5375
+	z5376 = x5376
+	z5377 = x5377
+	z5378 = x5378
+	z5379 = x5379
+	z5380 = x5380
+	z5381 = x5381
+	z5382 = x5382
+	z5383 = x5383
+	z5384 = x5384
+	z5385 = x5385
+	z5386 = x5386
+	z5387 = x5387
+	z5388 = x5388
+	z5389 = x5389
+	z5390 = x5390
+	z5391 = x5391
+	z5392 = x5392
+	z5393 = x5393
+	z5394 = x5394
+	z5395 = x5395
+	z5396 = x5396
+	z5397 = x5397
+	z5398 = x5398
+	z5399 = x5399
+	z5400 = x5400
+	z5401 = x5401
+	z5402 = x5402
+	z5403 = x5403
+	z5404 = x5404
+	z5405 = x5405
+	z5406 = x5406
+	z5407 = x5407
+	z5408 = x5408
+	z5409 = x5409
+	z5410 = x5410
+	z5411 = x5411
+	z5412 = x5412
+	z5413 = x5413
+	z5414 = x5414
+	z5415 = x5415
+	z5416 = x5416
+	z5417 = x5417
+	z5418 = x5418
+	z5419 = x5419
+	z5420 = x5420
+	z5421 = x5421
+	z5422 = x5422
+	z5423 = x5423
+	z5424 = x5424
+	z5425 = x5425
+	z5426 = x5426
+	z5427 = x5427
+	z5428 = x5428
+	z5429 = x5429
+	z5430 = x5430
+	z5431 = x5431
+	z5432 = x5432
+	z5433 = x5433
+	z5434 = x5434
+	z5435 = x5435
+	z5436 = x5436
+	z5437 = x5437
+	z5438 = x5438
+	z5439 = x5439
+	z5440 = x5440
+	z5441 = x5441
+	z5442 = x5442
+	z5443 = x5443
+	z5444 = x5444
+	z5445 = x5445
+	z5446 = x5446
+	z5447 = x5447
+	z5448 = x5448
+	z5449 = x5449
+	z5450 = x5450
+	z5451 = x5451
+	z5452 = x5452
+	z5453 = x5453
+	z5454 = x5454
+	z5455 = x5455
+	z5456 = x5456
+	z5457 = x5457
+	z5458 = x5458
+	z5459 = x5459
+	z5460 = x5460
+	z5461 = x5461
+	z5462 = x5462
+	z5463 = x5463
+	z5464 = x5464
+	z5465 = x5465
+	z5466 = x5466
+	z5467 = x5467
+	z5468 = x5468
+	z5469 = x5469
+	z5470 = x5470
+	z5471 = x5471
+	z5472 = x5472
+	z5473 = x5473
+	z5474 = x5474
+	z5475 = x5475
+	z5476 = x5476
+	z5477 = x5477
+	z5478 = x5478
+	z5479 = x5479
+	z5480 = x5480
+	z5481 = x5481
+	z5482 = x5482
+	z5483 = x5483
+	z5484 = x5484
+	z5485 = x5485
+	z5486 = x5486
+	z5487 = x5487
+	z5488 = x5488
+	z5489 = x5489
+	z5490 = x5490
+	z5491 = x5491
+	z5492 = x5492
+	z5493 = x5493
+	z5494 = x5494
+	z5495 = x5495
+	z5496 = x5496
+	z5497 = x5497
+	z5498 = x5498
+	z5499 = x5499
+	z5500 = x5500
+	z5501 = x5501
+	z5502 = x5502
+	z5503 = x5503
+	z5504 = x5504
+	z5505 = x5505
+	z5506 = x5506
+	z5507 = x5507
+	z5508 = x5508
+	z5509 = x5509
+	z5510 = x5510
+	z5511 = x5511
+	z5512 = x5512
+	z5513 = x5513
+	z5514 = x5514
+	z5515 = x5515
+	z5516 = x5516
+	z5517 = x5517
+	z5518 = x5518
+	z5519 = x5519
+	z5520 = x5520
+	z5521 = x5521
+	z5522 = x5522
+	z5523 = x5523
+	z5524 = x5524
+	z5525 = x5525
+	z5526 = x5526
+	z5527 = x5527
+	z5528 = x5528
+	z5529 = x5529
+	z5530 = x5530
+	z5531 = x5531
+	z5532 = x5532
+	z5533 = x5533
+	z5534 = x5534
+	z5535 = x5535
+	z5536 = x5536
+	z5537 = x5537
+	z5538 = x5538
+	z5539 = x5539
+	z5540 = x5540
+	z5541 = x5541
+	z5542 = x5542
+	z5543 = x5543
+	z5544 = x5544
+	z5545 = x5545
+	z5546 = x5546
+	z5547 = x5547
+	z5548 = x5548
+	z5549 = x5549
+	z5550 = x5550
+	z5551 = x5551
+	z5552 = x5552
+	z5553 = x5553
+	z5554 = x5554
+	z5555 = x5555
+	z5556 = x5556
+	z5557 = x5557
+	z5558 = x5558
+	z5559 = x5559
+	z5560 = x5560
+	z5561 = x5561
+	z5562 = x5562
+	z5563 = x5563
+	z5564 = x5564
+	z5565 = x5565
+	z5566 = x5566
+	z5567 = x5567
+	z5568 = x5568
+	z5569 = x5569
+	z5570 = x5570
+	z5571 = x5571
+	z5572 = x5572
+	z5573 = x5573
+	z5574 = x5574
+	z5575 = x5575
+	z5576 = x5576
+	z5577 = x5577
+	z5578 = x5578
+	z5579 = x5579
+	z5580 = x5580
+	z5581 = x5581
+	z5582 = x5582
+	z5583 = x5583
+	z5584 = x5584
+	z5585 = x5585
+	z5586 = x5586
+	z5587 = x5587
+	z5588 = x5588
+	z5589 = x5589
+	z5590 = x5590
+	z5591 = x5591
+	z5592 = x5592
+	z5593 = x5593
+	z5594 = x5594
+	z5595 = x5595
+	z5596 = x5596
+	z5597 = x5597
+	z5598 = x5598
+	z5599 = x5599
+	z5600 = x5600
+	z5601 = x5601
+	z5602 = x5602
+	z5603 = x5603
+	z5604 = x5604
+	z5605 = x5605
+	z5606 = x5606
+	z5607 = x5607
+	z5608 = x5608
+	z5609 = x5609
+	z5610 = x5610
+	z5611 = x5611
+	z5612 = x5612
+	z5613 = x5613
+	z5614 = x5614
+	z5615 = x5615
+	z5616 = x5616
+	z5617 = x5617
+	z5618 = x5618
+	z5619 = x5619
+	z5620 = x5620
+	z5621 = x5621
+	z5622 = x5622
+	z5623 = x5623
+	z5624 = x5624
+	z5625 = x5625
+	z5626 = x5626
+	z5627 = x5627
+	z5628 = x5628
+	z5629 = x5629
+	z5630 = x5630
+	z5631 = x5631
+	z5632 = x5632
+	z5633 = x5633
+	z5634 = x5634
+	z5635 = x5635
+	z5636 = x5636
+	z5637 = x5637
+	z5638 = x5638
+	z5639 = x5639
+	z5640 = x5640
+	z5641 = x5641
+	z5642 = x5642
+	z5643 = x5643
+	z5644 = x5644
+	z5645 = x5645
+	z5646 = x5646
+	z5647 = x5647
+	z5648 = x5648
+	z5649 = x5649
+	z5650 = x5650
+	z5651 = x5651
+	z5652 = x5652
+	z5653 = x5653
+	z5654 = x5654
+	z5655 = x5655
+	z5656 = x5656
+	z5657 = x5657
+	z5658 = x5658
+	z5659 = x5659
+	z5660 = x5660
+	z5661 = x5661
+	z5662 = x5662
+	z5663 = x5663
+	z5664 = x5664
+	z5665 = x5665
+	z5666 = x5666
+	z5667 = x5667
+	z5668 = x5668
+	z5669 = x5669
+	z5670 = x5670
+	z5671 = x5671
+	z5672 = x5672
+	z5673 = x5673
+	z5674 = x5674
+	z5675 = x5675
+	z5676 = x5676
+	z5677 = x5677
+	z5678 = x5678
+	z5679 = x5679
+	z5680 = x5680
+	z5681 = x5681
+	z5682 = x5682
+	z5683 = x5683
+	z5684 = x5684
+	z5685 = x5685
+	z5686 = x5686
+	z5687 = x5687
+	z5688 = x5688
+	z5689 = x5689
+	z5690 = x5690
+	z5691 = x5691
+	z5692 = x5692
+	z5693 = x5693
+	z5694 = x5694
+	z5695 = x5695
+	z5696 = x5696
+	z5697 = x5697
+	z5698 = x5698
+	z5699 = x5699
+	z5700 = x5700
+	z5701 = x5701
+	z5702 = x5702
+	z5703 = x5703
+	z5704 = x5704
+	z5705 = x5705
+	z5706 = x5706
+	z5707 = x5707
+	z5708 = x5708
+	z5709 = x5709
+	z5710 = x5710
+	z5711 = x5711
+	z5712 = x5712
+	z5713 = x5713
+	z5714 = x5714
+	z5715 = x5715
+	z5716 = x5716
+	z5717 = x5717
+	z5718 = x5718
+	z5719 = x5719
+	z5720 = x5720
+	z5721 = x5721
+	z5722 = x5722
+	z5723 = x5723
+	z5724 = x5724
+	z5725 = x5725
+	z5726 = x5726
+	z5727 = x5727
+	z5728 = x5728
+	z5729 = x5729
+	z5730 = x5730
+	z5731 = x5731
+	z5732 = x5732
+	z5733 = x5733
+	z5734 = x5734
+	z5735 = x5735
+	z5736 = x5736
+	z5737 = x5737
+	z5738 = x5738
+	z5739 = x5739
+	z5740 = x5740
+	z5741 = x5741
+	z5742 = x5742
+	z5743 = x5743
+	z5744 = x5744
+	z5745 = x5745
+	z5746 = x5746
+	z5747 = x5747
+	z5748 = x5748
+	z5749 = x5749
+	z5750 = x5750
+	z5751 = x5751
+	z5752 = x5752
+	z5753 = x5753
+	z5754 = x5754
+	z5755 = x5755
+	z5756 = x5756
+	z5757 = x5757
+	z5758 = x5758
+	z5759 = x5759
+	z5760 = x5760
+	z5761 = x5761
+	z5762 = x5762
+	z5763 = x5763
+	z5764 = x5764
+	z5765 = x5765
+	z5766 = x5766
+	z5767 = x5767
+	z5768 = x5768
+	z5769 = x5769
+	z5770 = x5770
+	z5771 = x5771
+	z5772 = x5772
+	z5773 = x5773
+	z5774 = x5774
+	z5775 = x5775
+	z5776 = x5776
+	z5777 = x5777
+	z5778 = x5778
+	z5779 = x5779
+	z5780 = x5780
+	z5781 = x5781
+	z5782 = x5782
+	z5783 = x5783
+	z5784 = x5784
+	z5785 = x5785
+	z5786 = x5786
+	z5787 = x5787
+	z5788 = x5788
+	z5789 = x5789
+	z5790 = x5790
+	z5791 = x5791
+	z5792 = x5792
+	z5793 = x5793
+	z5794 = x5794
+	z5795 = x5795
+	z5796 = x5796
+	z5797 = x5797
+	z5798 = x5798
+	z5799 = x5799
+	z5800 = x5800
+	z5801 = x5801
+	z5802 = x5802
+	z5803 = x5803
+	z5804 = x5804
+	z5805 = x5805
+	z5806 = x5806
+	z5807 = x5807
+	z5808 = x5808
+	z5809 = x5809
+	z5810 = x5810
+	z5811 = x5811
+	z5812 = x5812
+	z5813 = x5813
+	z5814 = x5814
+	z5815 = x5815
+	z5816 = x5816
+	z5817 = x5817
+	z5818 = x5818
+	z5819 = x5819
+	z5820 = x5820
+	z5821 = x5821
+	z5822 = x5822
+	z5823 = x5823
+	z5824 = x5824
+	z5825 = x5825
+	z5826 = x5826
+	z5827 = x5827
+	z5828 = x5828
+	z5829 = x5829
+	z5830 = x5830
+	z5831 = x5831
+	z5832 = x5832
+	z5833 = x5833
+	z5834 = x5834
+	z5835 = x5835
+	z5836 = x5836
+	z5837 = x5837
+	z5838 = x5838
+	z5839 = x5839
+	z5840 = x5840
+	z5841 = x5841
+	z5842 = x5842
+	z5843 = x5843
+	z5844 = x5844
+	z5845 = x5845
+	z5846 = x5846
+	z5847 = x5847
+	z5848 = x5848
+	z5849 = x5849
+	z5850 = x5850
+	z5851 = x5851
+	z5852 = x5852
+	z5853 = x5853
+	z5854 = x5854
+	z5855 = x5855
+	z5856 = x5856
+	z5857 = x5857
+	z5858 = x5858
+	z5859 = x5859
+	z5860 = x5860
+	z5861 = x5861
+	z5862 = x5862
+	z5863 = x5863
+	z5864 = x5864
+	z5865 = x5865
+	z5866 = x5866
+	z5867 = x5867
+	z5868 = x5868
+	z5869 = x5869
+	z5870 = x5870
+	z5871 = x5871
+	z5872 = x5872
+	z5873 = x5873
+	z5874 = x5874
+	z5875 = x5875
+	z5876 = x5876
+	z5877 = x5877
+	z5878 = x5878
+	z5879 = x5879
+	z5880 = x5880
+	z5881 = x5881
+	z5882 = x5882
+	z5883 = x5883
+	z5884 = x5884
+	z5885 = x5885
+	z5886 = x5886
+	z5887 = x5887
+	z5888 = x5888
+	z5889 = x5889
+	z5890 = x5890
+	z5891 = x5891
+	z5892 = x5892
+	z5893 = x5893
+	z5894 = x5894
+	z5895 = x5895
+	z5896 = x5896
+	z5897 = x5897
+	z5898 = x5898
+	z5899 = x5899
+	z5900 = x5900
+	z5901 = x5901
+	z5902 = x5902
+	z5903 = x5903
+	z5904 = x5904
+	z5905 = x5905
+	z5906 = x5906
+	z5907 = x5907
+	z5908 = x5908
+	z5909 = x5909
+	z5910 = x5910
+	z5911 = x5911
+	z5912 = x5912
+	z5913 = x5913
+	z5914 = x5914
+	z5915 = x5915
+	z5916 = x5916
+	z5917 = x5917
+	z5918 = x5918
+	z5919 = x5919
+	z5920 = x5920
+	z5921 = x5921
+	z5922 = x5922
+	z5923 = x5923
+	z5924 = x5924
+	z5925 = x5925
+	z5926 = x5926
+	z5927 = x5927
+	z5928 = x5928
+	z5929 = x5929
+	z5930 = x5930
+	z5931 = x5931
+	z5932 = x5932
+	z5933 = x5933
+	z5934 = x5934
+	z5935 = x5935
+	z5936 = x5936
+	z5937 = x5937
+	z5938 = x5938
+	z5939 = x5939
+	z5940 = x5940
+	z5941 = x5941
+	z5942 = x5942
+	z5943 = x5943
+	z5944 = x5944
+	z5945 = x5945
+	z5946 = x5946
+	z5947 = x5947
+	z5948 = x5948
+	z5949 = x5949
+	z5950 = x5950
+	z5951 = x5951
+	z5952 = x5952
+	z5953 = x5953
+	z5954 = x5954
+	z5955 = x5955
+	z5956 = x5956
+	z5957 = x5957
+	z5958 = x5958
+	z5959 = x5959
+	z5960 = x5960
+	z5961 = x5961
+	z5962 = x5962
+	z5963 = x5963
+	z5964 = x5964
+	z5965 = x5965
+	z5966 = x5966
+	z5967 = x5967
+	z5968 = x5968
+	z5969 = x5969
+	z5970 = x5970
+	z5971 = x5971
+	z5972 = x5972
+	z5973 = x5973
+	z5974 = x5974
+	z5975 = x5975
+	z5976 = x5976
+	z5977 = x5977
+	z5978 = x5978
+	z5979 = x5979
+	z5980 = x5980
+	z5981 = x5981
+	z5982 = x5982
+	z5983 = x5983
+	z5984 = x5984
+	z5985 = x5985
+	z5986 = x5986
+	z5987 = x5987
+	z5988 = x5988
+	z5989 = x5989
+	z5990 = x5990
+	z5991 = x5991
+	z5992 = x5992
+	z5993 = x5993
+	z5994 = x5994
+	z5995 = x5995
+	z5996 = x5996
+	z5997 = x5997
+	z5998 = x5998
+	z5999 = x5999
+	z6000 = x6000
+	z6001 = x6001
+	z6002 = x6002
+	z6003 = x6003
+	z6004 = x6004
+	z6005 = x6005
+	z6006 = x6006
+	z6007 = x6007
+	z6008 = x6008
+	z6009 = x6009
+	z6010 = x6010
+	z6011 = x6011
+	z6012 = x6012
+	z6013 = x6013
+	z6014 = x6014
+	z6015 = x6015
+	z6016 = x6016
+	z6017 = x6017
+	z6018 = x6018
+	z6019 = x6019
+	z6020 = x6020
+	z6021 = x6021
+	z6022 = x6022
+	z6023 = x6023
+	z6024 = x6024
+	z6025 = x6025
+	z6026 = x6026
+	z6027 = x6027
+	z6028 = x6028
+	z6029 = x6029
+	z6030 = x6030
+	z6031 = x6031
+	z6032 = x6032
+	z6033 = x6033
+	z6034 = x6034
+	z6035 = x6035
+	z6036 = x6036
+	z6037 = x6037
+	z6038 = x6038
+	z6039 = x6039
+	z6040 = x6040
+	z6041 = x6041
+	z6042 = x6042
+	z6043 = x6043
+	z6044 = x6044
+	z6045 = x6045
+	z6046 = x6046
+	z6047 = x6047
+	z6048 = x6048
+	z6049 = x6049
+	z6050 = x6050
+	z6051 = x6051
+	z6052 = x6052
+	z6053 = x6053
+	z6054 = x6054
+	z6055 = x6055
+	z6056 = x6056
+	z6057 = x6057
+	z6058 = x6058
+	z6059 = x6059
+	z6060 = x6060
+	z6061 = x6061
+	z6062 = x6062
+	z6063 = x6063
+	z6064 = x6064
+	z6065 = x6065
+	z6066 = x6066
+	z6067 = x6067
+	z6068 = x6068
+	z6069 = x6069
+	z6070 = x6070
+	z6071 = x6071
+	z6072 = x6072
+	z6073 = x6073
+	z6074 = x6074
+	z6075 = x6075
+	z6076 = x6076
+	z6077 = x6077
+	z6078 = x6078
+	z6079 = x6079
+	z6080 = x6080
+	z6081 = x6081
+	z6082 = x6082
+	z6083 = x6083
+	z6084 = x6084
+	z6085 = x6085
+	z6086 = x6086
+	z6087 = x6087
+	z6088 = x6088
+	z6089 = x6089
+	z6090 = x6090
+	z6091 = x6091
+	z6092 = x6092
+	z6093 = x6093
+	z6094 = x6094
+	z6095 = x6095
+	z6096 = x6096
+	z6097 = x6097
+	z6098 = x6098
+	z6099 = x6099
+	z6100 = x6100
+	z6101 = x6101
+	z6102 = x6102
+	z6103 = x6103
+	z6104 = x6104
+	z6105 = x6105
+	z6106 = x6106
+	z6107 = x6107
+	z6108 = x6108
+	z6109 = x6109
+	z6110 = x6110
+	z6111 = x6111
+	z6112 = x6112
+	z6113 = x6113
+	z6114 = x6114
+	z6115 = x6115
+	z6116 = x6116
+	z6117 = x6117
+	z6118 = x6118
+	z6119 = x6119
+	z6120 = x6120
+	z6121 = x6121
+	z6122 = x6122
+	z6123 = x6123
+	z6124 = x6124
+	z6125 = x6125
+	z6126 = x6126
+	z6127 = x6127
+	z6128 = x6128
+	z6129 = x6129
+	z6130 = x6130
+	z6131 = x6131
+	z6132 = x6132
+	z6133 = x6133
+	z6134 = x6134
+	z6135 = x6135
+	z6136 = x6136
+	z6137 = x6137
+	z6138 = x6138
+	z6139 = x6139
+	z6140 = x6140
+	z6141 = x6141
+	z6142 = x6142
+	z6143 = x6143
+	z6144 = x6144
+	z6145 = x6145
+	z6146 = x6146
+	z6147 = x6147
+	z6148 = x6148
+	z6149 = x6149
+	z6150 = x6150
+	z6151 = x6151
+	z6152 = x6152
+	z6153 = x6153
+	z6154 = x6154
+	z6155 = x6155
+	z6156 = x6156
+	z6157 = x6157
+	z6158 = x6158
+	z6159 = x6159
+	z6160 = x6160
+	z6161 = x6161
+	z6162 = x6162
+	z6163 = x6163
+	z6164 = x6164
+	z6165 = x6165
+	z6166 = x6166
+	z6167 = x6167
+	z6168 = x6168
+	z6169 = x6169
+	z6170 = x6170
+	z6171 = x6171
+	z6172 = x6172
+	z6173 = x6173
+	z6174 = x6174
+	z6175 = x6175
+	z6176 = x6176
+	z6177 = x6177
+	z6178 = x6178
+	z6179 = x6179
+	z6180 = x6180
+	z6181 = x6181
+	z6182 = x6182
+	z6183 = x6183
+	z6184 = x6184
+	z6185 = x6185
+	z6186 = x6186
+	z6187 = x6187
+	z6188 = x6188
+	z6189 = x6189
+	z6190 = x6190
+	z6191 = x6191
+	z6192 = x6192
+	z6193 = x6193
+	z6194 = x6194
+	z6195 = x6195
+	z6196 = x6196
+	z6197 = x6197
+	z6198 = x6198
+	z6199 = x6199
+	z6200 = x6200
+	z6201 = x6201
+	z6202 = x6202
+	z6203 = x6203
+	z6204 = x6204
+	z6205 = x6205
+	z6206 = x6206
+	z6207 = x6207
+	z6208 = x6208
+	z6209 = x6209
+	z6210 = x6210
+	z6211 = x6211
+	z6212 = x6212
+	z6213 = x6213
+	z6214 = x6214
+	z6215 = x6215
+	z6216 = x6216
+	z6217 = x6217
+	z6218 = x6218
+	z6219 = x6219
+	z6220 = x6220
+	z6221 = x6221
+	z6222 = x6222
+	z6223 = x6223
+	z6224 = x6224
+	z6225 = x6225
+	z6226 = x6226
+	z6227 = x6227
+	z6228 = x6228
+	z6229 = x6229
+	z6230 = x6230
+	z6231 = x6231
+	z6232 = x6232
+	z6233 = x6233
+	z6234 = x6234
+	z6235 = x6235
+	z6236 = x6236
+	z6237 = x6237
+	z6238 = x6238
+	z6239 = x6239
+	z6240 = x6240
+	z6241 = x6241
+	z6242 = x6242
+	z6243 = x6243
+	z6244 = x6244
+	z6245 = x6245
+	z6246 = x6246
+	z6247 = x6247
+	z6248 = x6248
+	z6249 = x6249
+	z6250 = x6250
+	z6251 = x6251
+	z6252 = x6252
+	z6253 = x6253
+	z6254 = x6254
+	z6255 = x6255
+	z6256 = x6256
+	z6257 = x6257
+	z6258 = x6258
+	z6259 = x6259
+	z6260 = x6260
+	z6261 = x6261
+	z6262 = x6262
+	z6263 = x6263
+	z6264 = x6264
+	z6265 = x6265
+	z6266 = x6266
+	z6267 = x6267
+	z6268 = x6268
+	z6269 = x6269
+	z6270 = x6270
+	z6271 = x6271
+	z6272 = x6272
+	z6273 = x6273
+	z6274 = x6274
+	z6275 = x6275
+	z6276 = x6276
+	z6277 = x6277
+	z6278 = x6278
+	z6279 = x6279
+	z6280 = x6280
+	z6281 = x6281
+	z6282 = x6282
+	z6283 = x6283
+	z6284 = x6284
+	z6285 = x6285
+	z6286 = x6286
+	z6287 = x6287
+	z6288 = x6288
+	z6289 = x6289
+	z6290 = x6290
+	z6291 = x6291
+	z6292 = x6292
+	z6293 = x6293
+	z6294 = x6294
+	z6295 = x6295
+	z6296 = x6296
+	z6297 = x6297
+	z6298 = x6298
+	z6299 = x6299
+	z6300 = x6300
+	z6301 = x6301
+	z6302 = x6302
+	z6303 = x6303
+	z6304 = x6304
+	z6305 = x6305
+	z6306 = x6306
+	z6307 = x6307
+	z6308 = x6308
+	z6309 = x6309
+	z6310 = x6310
+	z6311 = x6311
+	z6312 = x6312
+	z6313 = x6313
+	z6314 = x6314
+	z6315 = x6315
+	z6316 = x6316
+	z6317 = x6317
+	z6318 = x6318
+	z6319 = x6319
+	z6320 = x6320
+	z6321 = x6321
+	z6322 = x6322
+	z6323 = x6323
+	z6324 = x6324
+	z6325 = x6325
+	z6326 = x6326
+	z6327 = x6327
+	z6328 = x6328
+	z6329 = x6329
+	z6330 = x6330
+	z6331 = x6331
+	z6332 = x6332
+	z6333 = x6333
+	z6334 = x6334
+	z6335 = x6335
+	z6336 = x6336
+	z6337 = x6337
+	z6338 = x6338
+	z6339 = x6339
+	z6340 = x6340
+	z6341 = x6341
+	z6342 = x6342
+	z6343 = x6343
+	z6344 = x6344
+	z6345 = x6345
+	z6346 = x6346
+	z6347 = x6347
+	z6348 = x6348
+	z6349 = x6349
+	z6350 = x6350
+	z6351 = x6351
+	z6352 = x6352
+	z6353 = x6353
+	z6354 = x6354
+	z6355 = x6355
+	z6356 = x6356
+	z6357 = x6357
+	z6358 = x6358
+	z6359 = x6359
+	z6360 = x6360
+	z6361 = x6361
+	z6362 = x6362
+	z6363 = x6363
+	z6364 = x6364
+	z6365 = x6365
+	z6366 = x6366
+	z6367 = x6367
+	z6368 = x6368
+	z6369 = x6369
+	z6370 = x6370
+	z6371 = x6371
+	z6372 = x6372
+	z6373 = x6373
+	z6374 = x6374
+	z6375 = x6375
+	z6376 = x6376
+	z6377 = x6377
+	z6378 = x6378
+	z6379 = x6379
+	z6380 = x6380
+	z6381 = x6381
+	z6382 = x6382
+	z6383 = x6383
+	z6384 = x6384
+	z6385 = x6385
+	z6386 = x6386
+	z6387 = x6387
+	z6388 = x6388
+	z6389 = x6389
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+	z7130 = x7130
+	z7131 = x7131
+	z7132 = x7132
+	z7133 = x7133
+	z7134 = x7134
+	z7135 = x7135
+	z7136 = x7136
+	z7137 = x7137
+	z7138 = x7138
+	z7139 = x7139
+	z7140 = x7140
+	z7141 = x7141
+	z7142 = x7142
+	z7143 = x7143
+	z7144 = x7144
+	z7145 = x7145
+	z7146 = x7146
+	z7147 = x7147
+	z7148 = x7148
+	z7149 = x7149
+	z7150 = x7150
+	z7151 = x7151
+	z7152 = x7152
+	z7153 = x7153
+	z7154 = x7154
+	z7155 = x7155
+	z7156 = x7156
+	z7157 = x7157
+	z7158 = x7158
+	z7159 = x7159
+	z7160 = x7160
+	z7161 = x7161
+	z7162 = x7162
+	z7163 = x7163
+	z7164 = x7164
+	z7165 = x7165
+	z7166 = x7166
+	z7167 = x7167
+	z7168 = x7168
+	z7169 = x7169
+	z7170 = x7170
+	z7171 = x7171
+	z7172 = x7172
+	z7173 = x7173
+	z7174 = x7174
+	z7175 = x7175
+	z7176 = x7176
+	z7177 = x7177
+	z7178 = x7178
+	z7179 = x7179
+	z7180 = x7180
+	z7181 = x7181
+	z7182 = x7182
+	z7183 = x7183
+	z7184 = x7184
+	z7185 = x7185
+	z7186 = x7186
+	z7187 = x7187
+	z7188 = x7188
+	z7189 = x7189
+	z7190 = x7190
+	z7191 = x7191
+	z7192 = x7192
+	z7193 = x7193
+	z7194 = x7194
+	z7195 = x7195
+	z7196 = x7196
+	z7197 = x7197
+	z7198 = x7198
+	z7199 = x7199
+	z7200 = x7200
+	z7201 = x7201
+	z7202 = x7202
+	z7203 = x7203
+	z7204 = x7204
+	z7205 = x7205
+	z7206 = x7206
+	z7207 = x7207
+	z7208 = x7208
+	z7209 = x7209
+	z7210 = x7210
+	z7211 = x7211
+	z7212 = x7212
+	z7213 = x7213
+	z7214 = x7214
+	z7215 = x7215
+	z7216 = x7216
+	z7217 = x7217
+	z7218 = x7218
+	z7219 = x7219
+	z7220 = x7220
+	z7221 = x7221
+	z7222 = x7222
+	z7223 = x7223
+	z7224 = x7224
+	z7225 = x7225
+	z7226 = x7226
+	z7227 = x7227
+	z7228 = x7228
+	z7229 = x7229
+	z7230 = x7230
+	z7231 = x7231
+	z7232 = x7232
+	z7233 = x7233
+	z7234 = x7234
+	z7235 = x7235
+	z7236 = x7236
+	z7237 = x7237
+	z7238 = x7238
+	z7239 = x7239
+	z7240 = x7240
+	z7241 = x7241
+	z7242 = x7242
+	z7243 = x7243
+	z7244 = x7244
+	z7245 = x7245
+	z7246 = x7246
+	z7247 = x7247
+	z7248 = x7248
+	z7249 = x7249
+	z7250 = x7250
+	z7251 = x7251
+	z7252 = x7252
+	z7253 = x7253
+	z7254 = x7254
+	z7255 = x7255
+	z7256 = x7256
+	z7257 = x7257
+	z7258 = x7258
+	z7259 = x7259
+	z7260 = x7260
+	z7261 = x7261
+	z7262 = x7262
+	z7263 = x7263
+	z7264 = x7264
+	z7265 = x7265
+	z7266 = x7266
+	z7267 = x7267
+	z7268 = x7268
+	z7269 = x7269
+	z7270 = x7270
+	z7271 = x7271
+	z7272 = x7272
+	z7273 = x7273
+	z7274 = x7274
+	z7275 = x7275
+	z7276 = x7276
+	z7277 = x7277
+	z7278 = x7278
+	z7279 = x7279
+	z7280 = x7280
+	z7281 = x7281
+	z7282 = x7282
+	z7283 = x7283
+	z7284 = x7284
+	z7285 = x7285
+	z7286 = x7286
+	z7287 = x7287
+	z7288 = x7288
+	z7289 = x7289
+	z7290 = x7290
+	z7291 = x7291
+	z7292 = x7292
+	z7293 = x7293
+	z7294 = x7294
+	z7295 = x7295
+	z7296 = x7296
+	z7297 = x7297
+	z7298 = x7298
+	z7299 = x7299
+	z7300 = x7300
+	z7301 = x7301
+	z7302 = x7302
+	z7303 = x7303
+	z7304 = x7304
+	z7305 = x7305
+	z7306 = x7306
+	z7307 = x7307
+	z7308 = x7308
+	z7309 = x7309
+	z7310 = x7310
+	z7311 = x7311
+	z7312 = x7312
+	z7313 = x7313
+	z7314 = x7314
+	z7315 = x7315
+	z7316 = x7316
+	z7317 = x7317
+	z7318 = x7318
+	z7319 = x7319
+	z7320 = x7320
+	z7321 = x7321
+	z7322 = x7322
+	z7323 = x7323
+	z7324 = x7324
+	z7325 = x7325
+	z7326 = x7326
+	z7327 = x7327
+	z7328 = x7328
+	z7329 = x7329
+	z7330 = x7330
+	z7331 = x7331
+	z7332 = x7332
+	z7333 = x7333
+	z7334 = x7334
+	z7335 = x7335
+	z7336 = x7336
+	z7337 = x7337
+	z7338 = x7338
+	z7339 = x7339
+	z7340 = x7340
+	z7341 = x7341
+	z7342 = x7342
+	z7343 = x7343
+	z7344 = x7344
+	z7345 = x7345
+	z7346 = x7346
+	z7347 = x7347
+	z7348 = x7348
+	z7349 = x7349
+	z7350 = x7350
+	z7351 = x7351
+	z7352 = x7352
+	z7353 = x7353
+	z7354 = x7354
+	z7355 = x7355
+	z7356 = x7356
+	z7357 = x7357
+	z7358 = x7358
+	z7359 = x7359
+	z7360 = x7360
+	z7361 = x7361
+	z7362 = x7362
+	z7363 = x7363
+	z7364 = x7364
+	z7365 = x7365
+	z7366 = x7366
+	z7367 = x7367
+	z7368 = x7368
+	z7369 = x7369
+	z7370 = x7370
+	z7371 = x7371
+	z7372 = x7372
+	z7373 = x7373
+	z7374 = x7374
+	z7375 = x7375
+	z7376 = x7376
+	z7377 = x7377
+	z7378 = x7378
+	z7379 = x7379
+	z7380 = x7380
+	z7381 = x7381
+	z7382 = x7382
+	z7383 = x7383
+	z7384 = x7384
+	z7385 = x7385
+	z7386 = x7386
+	z7387 = x7387
+	z7388 = x7388
+	z7389 = x7389
+	z7390 = x7390
+	z7391 = x7391
+	z7392 = x7392
+	z7393 = x7393
+	z7394 = x7394
+	z7395 = x7395
+	z7396 = x7396
+	z7397 = x7397
+	z7398 = x7398
+	z7399 = x7399
+	z7400 = x7400
+	z7401 = x7401
+	z7402 = x7402
+	z7403 = x7403
+	z7404 = x7404
+	z7405 = x7405
+	z7406 = x7406
+	z7407 = x7407
+	z7408 = x7408
+	z7409 = x7409
+	z7410 = x7410
+	z7411 = x7411
+	z7412 = x7412
+	z7413 = x7413
+	z7414 = x7414
+	z7415 = x7415
+	z7416 = x7416
+	z7417 = x7417
+	z7418 = x7418
+	z7419 = x7419
+	z7420 = x7420
+	z7421 = x7421
+	z7422 = x7422
+	z7423 = x7423
+	z7424 = x7424
+	z7425 = x7425
+	z7426 = x7426
+	z7427 = x7427
+	z7428 = x7428
+	z7429 = x7429
+	z7430 = x7430
+	z7431 = x7431
+	z7432 = x7432
+	z7433 = x7433
+	z7434 = x7434
+	z7435 = x7435
+	z7436 = x7436
+	z7437 = x7437
+	z7438 = x7438
+	z7439 = x7439
+	z7440 = x7440
+	z7441 = x7441
+	z7442 = x7442
+	z7443 = x7443
+	z7444 = x7444
+	z7445 = x7445
+	z7446 = x7446
+	z7447 = x7447
+	z7448 = x7448
+	z7449 = x7449
+	z7450 = x7450
+	z7451 = x7451
+	z7452 = x7452
+	z7453 = x7453
+	z7454 = x7454
+	z7455 = x7455
+	z7456 = x7456
+	z7457 = x7457
+	z7458 = x7458
+	z7459 = x7459
+	z7460 = x7460
+	z7461 = x7461
+	z7462 = x7462
+	z7463 = x7463
+	z7464 = x7464
+	z7465 = x7465
+	z7466 = x7466
+	z7467 = x7467
+	z7468 = x7468
+	z7469 = x7469
+	z7470 = x7470
+	z7471 = x7471
+	z7472 = x7472
+	z7473 = x7473
+	z7474 = x7474
+	z7475 = x7475
+	z7476 = x7476
+	z7477 = x7477
+	z7478 = x7478
+	z7479 = x7479
+	z7480 = x7480
+	z7481 = x7481
+	z7482 = x7482
+	z7483 = x7483
+	z7484 = x7484
+	z7485 = x7485
+	z7486 = x7486
+	z7487 = x7487
+	z7488 = x7488
+	z7489 = x7489
+	z7490 = x7490
+	z7491 = x7491
+	z7492 = x7492
+	z7493 = x7493
+	z7494 = x7494
+	z7495 = x7495
+	z7496 = x7496
+	z7497 = x7497
+	z7498 = x7498
+	z7499 = x7499
+	z7500 = x7500
+	z7501 = x7501
+	z7502 = x7502
+	z7503 = x7503
+	z7504 = x7504
+	z7505 = x7505
+	z7506 = x7506
+	z7507 = x7507
+	z7508 = x7508
+	z7509 = x7509
+	z7510 = x7510
+	z7511 = x7511
+	z7512 = x7512
+	z7513 = x7513
+	z7514 = x7514
+	z7515 = x7515
+	z7516 = x7516
+	z7517 = x7517
+	z7518 = x7518
+	z7519 = x7519
+	z7520 = x7520
+	z7521 = x7521
+	z7522 = x7522
+	z7523 = x7523
+	z7524 = x7524
+	z7525 = x7525
+	z7526 = x7526
+	z7527 = x7527
+	z7528 = x7528
+	z7529 = x7529
+	z7530 = x7530
+	z7531 = x7531
+	z7532 = x7532
+	z7533 = x7533
+	z7534 = x7534
+	z7535 = x7535
+	z7536 = x7536
+	z7537 = x7537
+	z7538 = x7538
+	z7539 = x7539
+	z7540 = x7540
+	z7541 = x7541
+	z7542 = x7542
+	z7543 = x7543
+	z7544 = x7544
+	z7545 = x7545
+	z7546 = x7546
+	z7547 = x7547
+	z7548 = x7548
+	z7549 = x7549
+	z7550 = x7550
+	z7551 = x7551
+	z7552 = x7552
+	z7553 = x7553
+	z7554 = x7554
+	z7555 = x7555
+	z7556 = x7556
+	z7557 = x7557
+	z7558 = x7558
+	z7559 = x7559
+	z7560 = x7560
+	z7561 = x7561
+	z7562 = x7562
+	z7563 = x7563
+	z7564 = x7564
+	z7565 = x7565
+	z7566 = x7566
+	z7567 = x7567
+	z7568 = x7568
+	z7569 = x7569
+	z7570 = x7570
+	z7571 = x7571
+	z7572 = x7572
+	z7573 = x7573
+	z7574 = x7574
+	z7575 = x7575
+	z7576 = x7576
+	z7577 = x7577
+	z7578 = x7578
+	z7579 = x7579
+	z7580 = x7580
+	z7581 = x7581
+	z7582 = x7582
+	z7583 = x7583
+	z7584 = x7584
+	z7585 = x7585
+	z7586 = x7586
+	z7587 = x7587
+	z7588 = x7588
+	z7589 = x7589
+	z7590 = x7590
+	z7591 = x7591
+	z7592 = x7592
+	z7593 = x7593
+	z7594 = x7594
+	z7595 = x7595
+	z7596 = x7596
+	z7597 = x7597
+	z7598 = x7598
+	z7599 = x7599
+	z7600 = x7600
+	z7601 = x7601
+	z7602 = x7602
+	z7603 = x7603
+	z7604 = x7604
+	z7605 = x7605
+	z7606 = x7606
+	z7607 = x7607
+	z7608 = x7608
+	z7609 = x7609
+	z7610 = x7610
+	z7611 = x7611
+	z7612 = x7612
+	z7613 = x7613
+	z7614 = x7614
+	z7615 = x7615
+	z7616 = x7616
+	z7617 = x7617
+	z7618 = x7618
+	z7619 = x7619
+	z7620 = x7620
+	z7621 = x7621
+	z7622 = x7622
+	z7623 = x7623
+	z7624 = x7624
+	z7625 = x7625
+	z7626 = x7626
+	z7627 = x7627
+	z7628 = x7628
+	z7629 = x7629
+	z7630 = x7630
+	z7631 = x7631
+	z7632 = x7632
+	z7633 = x7633
+	z7634 = x7634
+	z7635 = x7635
+	z7636 = x7636
+	z7637 = x7637
+	z7638 = x7638
+	z7639 = x7639
+	z7640 = x7640
+	z7641 = x7641
+	z7642 = x7642
+	z7643 = x7643
+	z7644 = x7644
+	z7645 = x7645
+	z7646 = x7646
+	z7647 = x7647
+	z7648 = x7648
+	z7649 = x7649
+	z7650 = x7650
+	z7651 = x7651
+	z7652 = x7652
+	z7653 = x7653
+	z7654 = x7654
+	z7655 = x7655
+	z7656 = x7656
+	z7657 = x7657
+	z7658 = x7658
+	z7659 = x7659
+	z7660 = x7660
+	z7661 = x7661
+	z7662 = x7662
+	z7663 = x7663
+	z7664 = x7664
+	z7665 = x7665
+	z7666 = x7666
+	z7667 = x7667
+	z7668 = x7668
+	z7669 = x7669
+	z7670 = x7670
+	z7671 = x7671
+	z7672 = x7672
+	z7673 = x7673
+	z7674 = x7674
+	z7675 = x7675
+	z7676 = x7676
+	z7677 = x7677
+	z7678 = x7678
+	z7679 = x7679
+	z7680 = x7680
+	z7681 = x7681
+	z7682 = x7682
+	z7683 = x7683
+	z7684 = x7684
+	z7685 = x7685
+	z7686 = x7686
+	z7687 = x7687
+	z7688 = x7688
+	z7689 = x7689
+	z7690 = x7690
+	z7691 = x7691
+	z7692 = x7692
+	z7693 = x7693
+	z7694 = x7694
+	z7695 = x7695
+	z7696 = x7696
+	z7697 = x7697
+	z7698 = x7698
+	z7699 = x7699
+	z7700 = x7700
+	z7701 = x7701
+	z7702 = x7702
+	z7703 = x7703
+	z7704 = x7704
+	z7705 = x7705
+	z7706 = x7706
+	z7707 = x7707
+	z7708 = x7708
+	z7709 = x7709
+	z7710 = x7710
+	z7711 = x7711
+	z7712 = x7712
+	z7713 = x7713
+	z7714 = x7714
+	z7715 = x7715
+	z7716 = x7716
+	z7717 = x7717
+	z7718 = x7718
+	z7719 = x7719
+	z7720 = x7720
+	z7721 = x7721
+	z7722 = x7722
+	z7723 = x7723
+	z7724 = x7724
+	z7725 = x7725
+	z7726 = x7726
+	z7727 = x7727
+	z7728 = x7728
+	z7729 = x7729
+	z7730 = x7730
+	z7731 = x7731
+	z7732 = x7732
+	z7733 = x7733
+	z7734 = x7734
+	z7735 = x7735
+	z7736 = x7736
+	z7737 = x7737
+	z7738 = x7738
+	z7739 = x7739
+	z7740 = x7740
+	z7741 = x7741
+	z7742 = x7742
+	z7743 = x7743
+	z7744 = x7744
+	z7745 = x7745
+	z7746 = x7746
+	z7747 = x7747
+	z7748 = x7748
+	z7749 = x7749
+	z7750 = x7750
+	z7751 = x7751
+	z7752 = x7752
+	z7753 = x7753
+	z7754 = x7754
+	z7755 = x7755
+	z7756 = x7756
+	z7757 = x7757
+	z7758 = x7758
+	z7759 = x7759
+	z7760 = x7760
+	z7761 = x7761
+	z7762 = x7762
+	z7763 = x7763
+	z7764 = x7764
+	z7765 = x7765
+	z7766 = x7766
+	z7767 = x7767
+	z7768 = x7768
+	z7769 = x7769
+	z7770 = x7770
+	z7771 = x7771
+	z7772 = x7772
+	z7773 = x7773
+	z7774 = x7774
+	z7775 = x7775
+	z7776 = x7776
+	z7777 = x7777
+	z7778 = x7778
+	z7779 = x7779
+	z7780 = x7780
+	z7781 = x7781
+	z7782 = x7782
+	z7783 = x7783
+	z7784 = x7784
+	z7785 = x7785
+	z7786 = x7786
+	z7787 = x7787
+	z7788 = x7788
+	z7789 = x7789
+	z7790 = x7790
+	z7791 = x7791
+	z7792 = x7792
+	z7793 = x7793
+	z7794 = x7794
+	z7795 = x7795
+	z7796 = x7796
+	z7797 = x7797
+	z7798 = x7798
+	z7799 = x7799
+	z7800 = x7800
+	z7801 = x7801
+	z7802 = x7802
+	z7803 = x7803
+	z7804 = x7804
+	z7805 = x7805
+	z7806 = x7806
+	z7807 = x7807
+	z7808 = x7808
+	z7809 = x7809
+	z7810 = x7810
+	z7811 = x7811
+	z7812 = x7812
+	z7813 = x7813
+	z7814 = x7814
+	z7815 = x7815
+	z7816 = x7816
+	z7817 = x7817
+	z7818 = x7818
+	z7819 = x7819
+	z7820 = x7820
+	z7821 = x7821
+	z7822 = x7822
+	z7823 = x7823
+	z7824 = x7824
+	z7825 = x7825
+	z7826 = x7826
+	z7827 = x7827
+	z7828 = x7828
+	z7829 = x7829
+	z7830 = x7830
+	z7831 = x7831
+	z7832 = x7832
+	z7833 = x7833
+	z7834 = x7834
+	z7835 = x7835
+	z7836 = x7836
+	z7837 = x7837
+	z7838 = x7838
+	z7839 = x7839
+	z7840 = x7840
+	z7841 = x7841
+	z7842 = x7842
+	z7843 = x7843
+	z7844 = x7844
+	z7845 = x7845
+	z7846 = x7846
+	z7847 = x7847
+	z7848 = x7848
+	z7849 = x7849
+	z7850 = x7850
+	z7851 = x7851
+	z7852 = x7852
+	z7853 = x7853
+	z7854 = x7854
+	z7855 = x7855
+	z7856 = x7856
+	z7857 = x7857
+	z7858 = x7858
+	z7859 = x7859
+	z7860 = x7860
+	z7861 = x7861
+	z7862 = x7862
+	z7863 = x7863
+	z7864 = x7864
+	z7865 = x7865
+	z7866 = x7866
+	z7867 = x7867
+	z7868 = x7868
+	z7869 = x7869
+	z7870 = x7870
+	z7871 = x7871
+	z7872 = x7872
+	z7873 = x7873
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+	z8614 = x8614
+	z8615 = x8615
+	z8616 = x8616
+	z8617 = x8617
+	z8618 = x8618
+	z8619 = x8619
+	z8620 = x8620
+	z8621 = x8621
+	z8622 = x8622
+	z8623 = x8623
+	z8624 = x8624
+	z8625 = x8625
+	z8626 = x8626
+	z8627 = x8627
+	z8628 = x8628
+	z8629 = x8629
+	z8630 = x8630
+	z8631 = x8631
+	z8632 = x8632
+	z8633 = x8633
+	z8634 = x8634
+	z8635 = x8635
+	z8636 = x8636
+	z8637 = x8637
+	z8638 = x8638
+	z8639 = x8639
+	z8640 = x8640
+	z8641 = x8641
+	z8642 = x8642
+	z8643 = x8643
+	z8644 = x8644
+	z8645 = x8645
+	z8646 = x8646
+	z8647 = x8647
+	z8648 = x8648
+	z8649 = x8649
+	z8650 = x8650
+	z8651 = x8651
+	z8652 = x8652
+	z8653 = x8653
+	z8654 = x8654
+	z8655 = x8655
+	z8656 = x8656
+	z8657 = x8657
+	z8658 = x8658
+	z8659 = x8659
+	z8660 = x8660
+	z8661 = x8661
+	z8662 = x8662
+	z8663 = x8663
+	z8664 = x8664
+	z8665 = x8665
+	z8666 = x8666
+	z8667 = x8667
+	z8668 = x8668
+	z8669 = x8669
+	z8670 = x8670
+	z8671 = x8671
+	z8672 = x8672
+	z8673 = x8673
+	z8674 = x8674
+	z8675 = x8675
+	z8676 = x8676
+	z8677 = x8677
+	z8678 = x8678
+	z8679 = x8679
+	z8680 = x8680
+	z8681 = x8681
+	z8682 = x8682
+	z8683 = x8683
+	z8684 = x8684
+	z8685 = x8685
+	z8686 = x8686
+	z8687 = x8687
+	z8688 = x8688
+	z8689 = x8689
+	z8690 = x8690
+	z8691 = x8691
+	z8692 = x8692
+	z8693 = x8693
+	z8694 = x8694
+	z8695 = x8695
+	z8696 = x8696
+	z8697 = x8697
+	z8698 = x8698
+	z8699 = x8699
+	z8700 = x8700
+	z8701 = x8701
+	z8702 = x8702
+	z8703 = x8703
+	z8704 = x8704
+	z8705 = x8705
+	z8706 = x8706
+	z8707 = x8707
+	z8708 = x8708
+	z8709 = x8709
+	z8710 = x8710
+	z8711 = x8711
+	z8712 = x8712
+	z8713 = x8713
+	z8714 = x8714
+	z8715 = x8715
+	z8716 = x8716
+	z8717 = x8717
+	z8718 = x8718
+	z8719 = x8719
+	z8720 = x8720
+	z8721 = x8721
+	z8722 = x8722
+	z8723 = x8723
+	z8724 = x8724
+	z8725 = x8725
+	z8726 = x8726
+	z8727 = x8727
+	z8728 = x8728
+	z8729 = x8729
+	z8730 = x8730
+	z8731 = x8731
+	z8732 = x8732
+	z8733 = x8733
+	z8734 = x8734
+	z8735 = x8735
+	z8736 = x8736
+	z8737 = x8737
+	z8738 = x8738
+	z8739 = x8739
+	z8740 = x8740
+	z8741 = x8741
+	z8742 = x8742
+	z8743 = x8743
+	z8744 = x8744
+	z8745 = x8745
+	z8746 = x8746
+	z8747 = x8747
+	z8748 = x8748
+	z8749 = x8749
+	z8750 = x8750
+	z8751 = x8751
+	z8752 = x8752
+	z8753 = x8753
+	z8754 = x8754
+	z8755 = x8755
+	z8756 = x8756
+	z8757 = x8757
+	z8758 = x8758
+	z8759 = x8759
+	z8760 = x8760
+	z8761 = x8761
+	z8762 = x8762
+	z8763 = x8763
+	z8764 = x8764
+	z8765 = x8765
+	z8766 = x8766
+	z8767 = x8767
+	z8768 = x8768
+	z8769 = x8769
+	z8770 = x8770
+	z8771 = x8771
+	z8772 = x8772
+	z8773 = x8773
+	z8774 = x8774
+	z8775 = x8775
+	z8776 = x8776
+	z8777 = x8777
+	z8778 = x8778
+	z8779 = x8779
+	z8780 = x8780
+	z8781 = x8781
+	z8782 = x8782
+	z8783 = x8783
+	z8784 = x8784
+	z8785 = x8785
+	z8786 = x8786
+	z8787 = x8787
+	z8788 = x8788
+	z8789 = x8789
+	z8790 = x8790
+	z8791 = x8791
+	z8792 = x8792
+	z8793 = x8793
+	z8794 = x8794
+	z8795 = x8795
+	z8796 = x8796
+	z8797 = x8797
+	z8798 = x8798
+	z8799 = x8799
+	z8800 = x8800
+	z8801 = x8801
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+	z8804 = x8804
+	z8805 = x8805
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+	z8811 = x8811
+	z8812 = x8812
+	z8813 = x8813
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+	z8815 = x8815
+	z8816 = x8816
+	z8817 = x8817
+	z8818 = x8818
+	z8819 = x8819
+	z8820 = x8820
+	z8821 = x8821
+	z8822 = x8822
+	z8823 = x8823
+	z8824 = x8824
+	z8825 = x8825
+	z8826 = x8826
+	z8827 = x8827
+	z8828 = x8828
+	z8829 = x8829
+	z8830 = x8830
+	z8831 = x8831
+	z8832 = x8832
+	z8833 = x8833
+	z8834 = x8834
+	z8835 = x8835
+	z8836 = x8836
+	z8837 = x8837
+	z8838 = x8838
+	z8839 = x8839
+	z8840 = x8840
+	z8841 = x8841
+	z8842 = x8842
+	z8843 = x8843
+	z8844 = x8844
+	z8845 = x8845
+	z8846 = x8846
+	z8847 = x8847
+	z8848 = x8848
+	z8849 = x8849
+	z8850 = x8850
+	z8851 = x8851
+	z8852 = x8852
+	z8853 = x8853
+	z8854 = x8854
+	z8855 = x8855
+	z8856 = x8856
+	z8857 = x8857
+	z8858 = x8858
+	z8859 = x8859
+	z8860 = x8860
+	z8861 = x8861
+	z8862 = x8862
+	z8863 = x8863
+	z8864 = x8864
+	z8865 = x8865
+	z8866 = x8866
+	z8867 = x8867
+	z8868 = x8868
+	z8869 = x8869
+	z8870 = x8870
+	z8871 = x8871
+	z8872 = x8872
+	z8873 = x8873
+	z8874 = x8874
+	z8875 = x8875
+	z8876 = x8876
+	z8877 = x8877
+	z8878 = x8878
+	z8879 = x8879
+	z8880 = x8880
+	z8881 = x8881
+	z8882 = x8882
+	z8883 = x8883
+	z8884 = x8884
+	z8885 = x8885
+	z8886 = x8886
+	z8887 = x8887
+	z8888 = x8888
+	z8889 = x8889
+	z8890 = x8890
+	z8891 = x8891
+	z8892 = x8892
+	z8893 = x8893
+	z8894 = x8894
+	z8895 = x8895
+	z8896 = x8896
+	z8897 = x8897
+	z8898 = x8898
+	z8899 = x8899
+	z8900 = x8900
+	z8901 = x8901
+	z8902 = x8902
+	z8903 = x8903
+	z8904 = x8904
+	z8905 = x8905
+	z8906 = x8906
+	z8907 = x8907
+	z8908 = x8908
+	z8909 = x8909
+	z8910 = x8910
+	z8911 = x8911
+	z8912 = x8912
+	z8913 = x8913
+	z8914 = x8914
+	z8915 = x8915
+	z8916 = x8916
+	z8917 = x8917
+	z8918 = x8918
+	z8919 = x8919
+	z8920 = x8920
+	z8921 = x8921
+	z8922 = x8922
+	z8923 = x8923
+	z8924 = x8924
+	z8925 = x8925
+	z8926 = x8926
+	z8927 = x8927
+	z8928 = x8928
+	z8929 = x8929
+	z8930 = x8930
+	z8931 = x8931
+	z8932 = x8932
+	z8933 = x8933
+	z8934 = x8934
+	z8935 = x8935
+	z8936 = x8936
+	z8937 = x8937
+	z8938 = x8938
+	z8939 = x8939
+	z8940 = x8940
+	z8941 = x8941
+	z8942 = x8942
+	z8943 = x8943
+	z8944 = x8944
+	z8945 = x8945
+	z8946 = x8946
+	z8947 = x8947
+	z8948 = x8948
+	z8949 = x8949
+	z8950 = x8950
+	z8951 = x8951
+	z8952 = x8952
+	z8953 = x8953
+	z8954 = x8954
+	z8955 = x8955
+	z8956 = x8956
+	z8957 = x8957
+	z8958 = x8958
+	z8959 = x8959
+	z8960 = x8960
+	z8961 = x8961
+	z8962 = x8962
+	z8963 = x8963
+	z8964 = x8964
+	z8965 = x8965
+	z8966 = x8966
+	z8967 = x8967
+	z8968 = x8968
+	z8969 = x8969
+	z8970 = x8970
+	z8971 = x8971
+	z8972 = x8972
+	z8973 = x8973
+	z8974 = x8974
+	z8975 = x8975
+	z8976 = x8976
+	z8977 = x8977
+	z8978 = x8978
+	z8979 = x8979
+	z8980 = x8980
+	z8981 = x8981
+	z8982 = x8982
+	z8983 = x8983
+	z8984 = x8984
+	z8985 = x8985
+	z8986 = x8986
+	z8987 = x8987
+	z8988 = x8988
+	z8989 = x8989
+	z8990 = x8990
+	z8991 = x8991
+	z8992 = x8992
+	z8993 = x8993
+	z8994 = x8994
+	z8995 = x8995
+	z8996 = x8996
+	z8997 = x8997
+	z8998 = x8998
+	z8999 = x8999
+	z9000 = x9000
+	z9001 = x9001
+	z9002 = x9002
+	z9003 = x9003
+	z9004 = x9004
+	z9005 = x9005
+	z9006 = x9006
+	z9007 = x9007
+	z9008 = x9008
+	z9009 = x9009
+	z9010 = x9010
+	z9011 = x9011
+	z9012 = x9012
+	z9013 = x9013
+	z9014 = x9014
+	z9015 = x9015
+	z9016 = x9016
+	z9017 = x9017
+	z9018 = x9018
+	z9019 = x9019
+	z9020 = x9020
+	z9021 = x9021
+	z9022 = x9022
+	z9023 = x9023
+	z9024 = x9024
+	z9025 = x9025
+	z9026 = x9026
+	z9027 = x9027
+	z9028 = x9028
+	z9029 = x9029
+	z9030 = x9030
+	z9031 = x9031
+	z9032 = x9032
+	z9033 = x9033
+	z9034 = x9034
+	z9035 = x9035
+	z9036 = x9036
+	z9037 = x9037
+	z9038 = x9038
+	z9039 = x9039
+	z9040 = x9040
+	z9041 = x9041
+	z9042 = x9042
+	z9043 = x9043
+	z9044 = x9044
+	z9045 = x9045
+	z9046 = x9046
+	z9047 = x9047
+	z9048 = x9048
+	z9049 = x9049
+	z9050 = x9050
+	z9051 = x9051
+	z9052 = x9052
+	z9053 = x9053
+	z9054 = x9054
+	z9055 = x9055
+	z9056 = x9056
+	z9057 = x9057
+	z9058 = x9058
+	z9059 = x9059
+	z9060 = x9060
+	z9061 = x9061
+	z9062 = x9062
+	z9063 = x9063
+	z9064 = x9064
+	z9065 = x9065
+	z9066 = x9066
+	z9067 = x9067
+	z9068 = x9068
+	z9069 = x9069
+	z9070 = x9070
+	z9071 = x9071
+	z9072 = x9072
+	z9073 = x9073
+	z9074 = x9074
+	z9075 = x9075
+	z9076 = x9076
+	z9077 = x9077
+	z9078 = x9078
+	z9079 = x9079
+	z9080 = x9080
+	z9081 = x9081
+	z9082 = x9082
+	z9083 = x9083
+	z9084 = x9084
+	z9085 = x9085
+	z9086 = x9086
+	z9087 = x9087
+	z9088 = x9088
+	z9089 = x9089
+	z9090 = x9090
+	z9091 = x9091
+	z9092 = x9092
+	z9093 = x9093
+	z9094 = x9094
+	z9095 = x9095
+	z9096 = x9096
+	z9097 = x9097
+	z9098 = x9098
+	z9099 = x9099
+	z9100 = x9100
+	z9101 = x9101
+	z9102 = x9102
+	z9103 = x9103
+	z9104 = x9104
+	z9105 = x9105
+	z9106 = x9106
+	z9107 = x9107
+	z9108 = x9108
+	z9109 = x9109
+	z9110 = x9110
+	z9111 = x9111
+	z9112 = x9112
+	z9113 = x9113
+	z9114 = x9114
+	z9115 = x9115
+	z9116 = x9116
+	z9117 = x9117
+	z9118 = x9118
+	z9119 = x9119
+	z9120 = x9120
+	z9121 = x9121
+	z9122 = x9122
+	z9123 = x9123
+	z9124 = x9124
+	z9125 = x9125
+	z9126 = x9126
+	z9127 = x9127
+	z9128 = x9128
+	z9129 = x9129
+	z9130 = x9130
+	z9131 = x9131
+	z9132 = x9132
+	z9133 = x9133
+	z9134 = x9134
+	z9135 = x9135
+	z9136 = x9136
+	z9137 = x9137
+	z9138 = x9138
+	z9139 = x9139
+	z9140 = x9140
+	z9141 = x9141
+	z9142 = x9142
+	z9143 = x9143
+	z9144 = x9144
+	z9145 = x9145
+	z9146 = x9146
+	z9147 = x9147
+	z9148 = x9148
+	z9149 = x9149
+	z9150 = x9150
+	z9151 = x9151
+	z9152 = x9152
+	z9153 = x9153
+	z9154 = x9154
+	z9155 = x9155
+	z9156 = x9156
+	z9157 = x9157
+	z9158 = x9158
+	z9159 = x9159
+	z9160 = x9160
+	z9161 = x9161
+	z9162 = x9162
+	z9163 = x9163
+	z9164 = x9164
+	z9165 = x9165
+	z9166 = x9166
+	z9167 = x9167
+	z9168 = x9168
+	z9169 = x9169
+	z9170 = x9170
+	z9171 = x9171
+	z9172 = x9172
+	z9173 = x9173
+	z9174 = x9174
+	z9175 = x9175
+	z9176 = x9176
+	z9177 = x9177
+	z9178 = x9178
+	z9179 = x9179
+	z9180 = x9180
+	z9181 = x9181
+	z9182 = x9182
+	z9183 = x9183
+	z9184 = x9184
+	z9185 = x9185
+	z9186 = x9186
+	z9187 = x9187
+	z9188 = x9188
+	z9189 = x9189
+	z9190 = x9190
+	z9191 = x9191
+	z9192 = x9192
+	z9193 = x9193
+	z9194 = x9194
+	z9195 = x9195
+	z9196 = x9196
+	z9197 = x9197
+	z9198 = x9198
+	z9199 = x9199
+	z9200 = x9200
+	z9201 = x9201
+	z9202 = x9202
+	z9203 = x9203
+	z9204 = x9204
+	z9205 = x9205
+	z9206 = x9206
+	z9207 = x9207
+	z9208 = x9208
+	z9209 = x9209
+	z9210 = x9210
+	z9211 = x9211
+	z9212 = x9212
+	z9213 = x9213
+	z9214 = x9214
+	z9215 = x9215
+	z9216 = x9216
+	z9217 = x9217
+	z9218 = x9218
+	z9219 = x9219
+	z9220 = x9220
+	z9221 = x9221
+	z9222 = x9222
+	z9223 = x9223
+	z9224 = x9224
+	z9225 = x9225
+	z9226 = x9226
+	z9227 = x9227
+	z9228 = x9228
+	z9229 = x9229
+	z9230 = x9230
+	z9231 = x9231
+	z9232 = x9232
+	z9233 = x9233
+	z9234 = x9234
+	z9235 = x9235
+	z9236 = x9236
+	z9237 = x9237
+	z9238 = x9238
+	z9239 = x9239
+	z9240 = x9240
+	z9241 = x9241
+	z9242 = x9242
+	z9243 = x9243
+	z9244 = x9244
+	z9245 = x9245
+	z9246 = x9246
+	z9247 = x9247
+	z9248 = x9248
+	z9249 = x9249
+	z9250 = x9250
+	z9251 = x9251
+	z9252 = x9252
+	z9253 = x9253
+	z9254 = x9254
+	z9255 = x9255
+	z9256 = x9256
+	z9257 = x9257
+	z9258 = x9258
+	z9259 = x9259
+	z9260 = x9260
+	z9261 = x9261
+	z9262 = x9262
+	z9263 = x9263
+	z9264 = x9264
+	z9265 = x9265
+	z9266 = x9266
+	z9267 = x9267
+	z9268 = x9268
+	z9269 = x9269
+	z9270 = x9270
+	z9271 = x9271
+	z9272 = x9272
+	z9273 = x9273
+	z9274 = x9274
+	z9275 = x9275
+	z9276 = x9276
+	z9277 = x9277
+	z9278 = x9278
+	z9279 = x9279
+	z9280 = x9280
+	z9281 = x9281
+	z9282 = x9282
+	z9283 = x9283
+	z9284 = x9284
+	z9285 = x9285
+	z9286 = x9286
+	z9287 = x9287
+	z9288 = x9288
+	z9289 = x9289
+	z9290 = x9290
+	z9291 = x9291
+	z9292 = x9292
+	z9293 = x9293
+	z9294 = x9294
+	z9295 = x9295
+	z9296 = x9296
+	z9297 = x9297
+	z9298 = x9298
+	z9299 = x9299
+	z9300 = x9300
+	z9301 = x9301
+	z9302 = x9302
+	z9303 = x9303
+	z9304 = x9304
+	z9305 = x9305
+	z9306 = x9306
+	z9307 = x9307
+	z9308 = x9308
+	z9309 = x9309
+	z9310 = x9310
+	z9311 = x9311
+	z9312 = x9312
+	z9313 = x9313
+	z9314 = x9314
+	z9315 = x9315
+	z9316 = x9316
+	z9317 = x9317
+	z9318 = x9318
+	z9319 = x9319
+	z9320 = x9320
+	z9321 = x9321
+	z9322 = x9322
+	z9323 = x9323
+	z9324 = x9324
+	z9325 = x9325
+	z9326 = x9326
+	z9327 = x9327
+	z9328 = x9328
+	z9329 = x9329
+	z9330 = x9330
+	z9331 = x9331
+	z9332 = x9332
+	z9333 = x9333
+	z9334 = x9334
+	z9335 = x9335
+	z9336 = x9336
+	z9337 = x9337
+	z9338 = x9338
+	z9339 = x9339
+	z9340 = x9340
+	z9341 = x9341
+	z9342 = x9342
+	z9343 = x9343
+	z9344 = x9344
+	z9345 = x9345
+	z9346 = x9346
+	z9347 = x9347
+	z9348 = x9348
+	z9349 = x9349
+	z9350 = x9350
+	z9351 = x9351
+	z9352 = x9352
+	z9353 = x9353
+	z9354 = x9354
+	z9355 = x9355
+	z9356 = x9356
+	z9357 = x9357
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+	z9375 = x9375
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+	z9385 = x9385
+	z9386 = x9386
+	z9387 = x9387
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+	z9396 = x9396
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+	z9401 = x9401
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+	z9411 = x9411
+	z9412 = x9412
+	z9413 = x9413
+	z9414 = x9414
+	z9415 = x9415
+	z9416 = x9416
+	z9417 = x9417
+	z9418 = x9418
+	z9419 = x9419
+	z9420 = x9420
+	z9421 = x9421
+	z9422 = x9422
+	z9423 = x9423
+	z9424 = x9424
+	z9425 = x9425
+	z9426 = x9426
+	z9427 = x9427
+	z9428 = x9428
+	z9429 = x9429
+	z9430 = x9430
+	z9431 = x9431
+	z9432 = x9432
+	z9433 = x9433
+	z9434 = x9434
+	z9435 = x9435
+	z9436 = x9436
+	z9437 = x9437
+	z9438 = x9438
+	z9439 = x9439
+	z9440 = x9440
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+	z9465 = x9465
+	z9466 = x9466
+	z9467 = x9467
+	z9468 = x9468
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+	z9470 = x9470
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+	z9472 = x9472
+	z9473 = x9473
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+	z9475 = x9475
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+	z9477 = x9477
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+	z9480 = x9480
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+	z9485 = x9485
+	z9486 = x9486
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+	z9488 = x9488
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+	z9490 = x9490
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+	z9630 = x9630
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+	z9635 = x9635
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+	z10095 = x10095
+	z10096 = x10096
+	z10097 = x10097
+	z10098 = x10098
+	z10099 = x10099
+	z10100 = x10100
+	z10101 = x10101
+	z10102 = x10102
+	z10103 = x10103
+	z10104 = x10104
+	z10105 = x10105
+	z10106 = x10106
+	z10107 = x10107
+	z10108 = x10108
+	z10109 = x10109
+	z10110 = x10110
+	z10111 = x10111
+	z10112 = x10112
+	z10113 = x10113
+	z10114 = x10114
+	z10115 = x10115
+	z10116 = x10116
+	z10117 = x10117
+	z10118 = x10118
+	z10119 = x10119
+	z10120 = x10120
+	z10121 = x10121
+	z10122 = x10122
+	z10123 = x10123
+	z10124 = x10124
+	z10125 = x10125
+	z10126 = x10126
+	z10127 = x10127
+	z10128 = x10128
+	z10129 = x10129
+	z10130 = x10130
+	z10131 = x10131
+	z10132 = x10132
+	z10133 = x10133
+	z10134 = x10134
+	z10135 = x10135
+	z10136 = x10136
+	z10137 = x10137
+	z10138 = x10138
+	z10139 = x10139
+	z10140 = x10140
+	z10141 = x10141
+	z10142 = x10142
+	z10143 = x10143
+	z10144 = x10144
+	z10145 = x10145
+	z10146 = x10146
+	z10147 = x10147
+	z10148 = x10148
+	z10149 = x10149
+	z10150 = x10150
+	z10151 = x10151
+	z10152 = x10152
+	z10153 = x10153
+	z10154 = x10154
+	z10155 = x10155
+	z10156 = x10156
+	z10157 = x10157
+	z10158 = x10158
+	z10159 = x10159
+	z10160 = x10160
+	z10161 = x10161
+	z10162 = x10162
+	z10163 = x10163
+	z10164 = x10164
+	z10165 = x10165
+	z10166 = x10166
+	z10167 = x10167
+	z10168 = x10168
+	z10169 = x10169
+	z10170 = x10170
+	z10171 = x10171
+	z10172 = x10172
+	z10173 = x10173
+	z10174 = x10174
+	z10175 = x10175
+	z10176 = x10176
+	z10177 = x10177
+	z10178 = x10178
+	z10179 = x10179
+	z10180 = x10180
+	z10181 = x10181
+	z10182 = x10182
+	z10183 = x10183
+	z10184 = x10184
+	z10185 = x10185
+	z10186 = x10186
+	z10187 = x10187
+	z10188 = x10188
+	z10189 = x10189
+	z10190 = x10190
+	z10191 = x10191
+	z10192 = x10192
+	z10193 = x10193
+	z10194 = x10194
+	z10195 = x10195
+	z10196 = x10196
+	z10197 = x10197
+	z10198 = x10198
+	z10199 = x10199
+	z10200 = x10200
+	z10201 = x10201
+	z10202 = x10202
+	z10203 = x10203
+	z10204 = x10204
+	z10205 = x10205
+	z10206 = x10206
+	z10207 = x10207
+	z10208 = x10208
+	z10209 = x10209
+	z10210 = x10210
+	z10211 = x10211
+	z10212 = x10212
+	z10213 = x10213
+	z10214 = x10214
+	z10215 = x10215
+	z10216 = x10216
+	z10217 = x10217
+	z10218 = x10218
+	z10219 = x10219
+	z10220 = x10220
+	z10221 = x10221
+	z10222 = x10222
+	z10223 = x10223
+	z10224 = x10224
+	z10225 = x10225
+	z10226 = x10226
+	z10227 = x10227
+	z10228 = x10228
+	z10229 = x10229
+	z10230 = x10230
+	z10231 = x10231
+	z10232 = x10232
+	z10233 = x10233
+	z10234 = x10234
+	z10235 = x10235
+	z10236 = x10236
+	z10237 = x10237
+	z10238 = x10238
+	z10239 = x10239
+	z10240 = x10240
+	z10241 = x10241
+	z10242 = x10242
+	z10243 = x10243
+	z10244 = x10244
+	z10245 = x10245
+	z10246 = x10246
+	z10247 = x10247
+	z10248 = x10248
+	z10249 = x10249
+	z10250 = x10250
+	z10251 = x10251
+	z10252 = x10252
+	z10253 = x10253
+	z10254 = x10254
+	z10255 = x10255
+	z10256 = x10256
+	z10257 = x10257
+	z10258 = x10258
+	z10259 = x10259
+	z10260 = x10260
+	z10261 = x10261
+	z10262 = x10262
+	z10263 = x10263
+	z10264 = x10264
+	z10265 = x10265
+	z10266 = x10266
+	z10267 = x10267
+	z10268 = x10268
+	z10269 = x10269
+	z10270 = x10270
+	z10271 = x10271
+	z10272 = x10272
+	z10273 = x10273
+	z10274 = x10274
+	z10275 = x10275
+	z10276 = x10276
+	z10277 = x10277
+	z10278 = x10278
+	z10279 = x10279
+	z10280 = x10280
+	z10281 = x10281
+	z10282 = x10282
+	z10283 = x10283
+	z10284 = x10284
+	z10285 = x10285
+	z10286 = x10286
+	z10287 = x10287
+	z10288 = x10288
+	z10289 = x10289
+	z10290 = x10290
+	z10291 = x10291
+	z10292 = x10292
+	z10293 = x10293
+	z10294 = x10294
+	z10295 = x10295
+	z10296 = x10296
+	z10297 = x10297
+	z10298 = x10298
+	z10299 = x10299
+	z10300 = x10300
+	z10301 = x10301
+	z10302 = x10302
+	z10303 = x10303
+	z10304 = x10304
+	z10305 = x10305
+	z10306 = x10306
+	z10307 = x10307
+	z10308 = x10308
+	z10309 = x10309
+	z10310 = x10310
+	z10311 = x10311
+	z10312 = x10312
+	z10313 = x10313
+	z10314 = x10314
+	z10315 = x10315
+	z10316 = x10316
+	z10317 = x10317
+	z10318 = x10318
+	z10319 = x10319
+	z10320 = x10320
+	z10321 = x10321
+	z10322 = x10322
+	z10323 = x10323
+	z10324 = x10324
+	z10325 = x10325
+	z10326 = x10326
+	z10327 = x10327
+	z10328 = x10328
+	z10329 = x10329
+	z10330 = x10330
+	z10331 = x10331
+	z10332 = x10332
+	z10333 = x10333
+	z10334 = x10334
+	z10335 = x10335
+	z10336 = x10336
+	z10337 = x10337
+	z10338 = x10338
+	z10339 = x10339
+	z10340 = x10340
+	z10341 = x10341
+	z10342 = x10342
+	z10343 = x10343
+	z10344 = x10344
+	z10345 = x10345
+	z10346 = x10346
+	z10347 = x10347
+	z10348 = x10348
+	z10349 = x10349
+	z10350 = x10350
+	z10351 = x10351
+	z10352 = x10352
+	z10353 = x10353
+	z10354 = x10354
+	z10355 = x10355
+	z10356 = x10356
+	z10357 = x10357
+	z10358 = x10358
+	z10359 = x10359
+	z10360 = x10360
+	z10361 = x10361
+	z10362 = x10362
+	z10363 = x10363
+	z10364 = x10364
+	z10365 = x10365
+	z10366 = x10366
+	z10367 = x10367
+	z10368 = x10368
+	z10369 = x10369
+	z10370 = x10370
+	z10371 = x10371
+	z10372 = x10372
+	z10373 = x10373
+	z10374 = x10374
+	z10375 = x10375
+	z10376 = x10376
+	z10377 = x10377
+	z10378 = x10378
+	z10379 = x10379
+	z10380 = x10380
+	z10381 = x10381
+	z10382 = x10382
+	z10383 = x10383
+	z10384 = x10384
+	z10385 = x10385
+	z10386 = x10386
+	z10387 = x10387
+	z10388 = x10388
+	z10389 = x10389
+	z10390 = x10390
+	z10391 = x10391
+	z10392 = x10392
+	z10393 = x10393
+	z10394 = x10394
+	z10395 = x10395
+	z10396 = x10396
+	z10397 = x10397
+	z10398 = x10398
+	z10399 = x10399
+	z10400 = x10400
+	z10401 = x10401
+	z10402 = x10402
+	z10403 = x10403
+	z10404 = x10404
+	z10405 = x10405
+	z10406 = x10406
+	z10407 = x10407
+	z10408 = x10408
+	z10409 = x10409
+	z10410 = x10410
+	z10411 = x10411
+	z10412 = x10412
+	z10413 = x10413
+	z10414 = x10414
+	z10415 = x10415
+	z10416 = x10416
+	z10417 = x10417
+	z10418 = x10418
+	z10419 = x10419
+	z10420 = x10420
+	z10421 = x10421
+	z10422 = x10422
+	z10423 = x10423
+	z10424 = x10424
+	z10425 = x10425
+	z10426 = x10426
+	z10427 = x10427
+	z10428 = x10428
+	z10429 = x10429
+	z10430 = x10430
+	z10431 = x10431
+	z10432 = x10432
+	z10433 = x10433
+	z10434 = x10434
+	z10435 = x10435
+	z10436 = x10436
+	z10437 = x10437
+	z10438 = x10438
+	z10439 = x10439
+	z10440 = x10440
+	z10441 = x10441
+	z10442 = x10442
+	z10443 = x10443
+	z10444 = x10444
+	z10445 = x10445
+	z10446 = x10446
+	z10447 = x10447
+	z10448 = x10448
+	z10449 = x10449
+	z10450 = x10450
+	z10451 = x10451
+	z10452 = x10452
+	z10453 = x10453
+	z10454 = x10454
+	z10455 = x10455
+	z10456 = x10456
+	z10457 = x10457
+	z10458 = x10458
+	z10459 = x10459
+	z10460 = x10460
+	z10461 = x10461
+	z10462 = x10462
+	z10463 = x10463
+	z10464 = x10464
+	z10465 = x10465
+	z10466 = x10466
+	z10467 = x10467
+	z10468 = x10468
+	z10469 = x10469
+	z10470 = x10470
+	z10471 = x10471
+	z10472 = x10472
+	z10473 = x10473
+	z10474 = x10474
+	z10475 = x10475
+	z10476 = x10476
+	z10477 = x10477
+	z10478 = x10478
+	z10479 = x10479
+	z10480 = x10480
+	z10481 = x10481
+	z10482 = x10482
+	z10483 = x10483
+	z10484 = x10484
+	z10485 = x10485
+	z10486 = x10486
+	z10487 = x10487
+	z10488 = x10488
+	z10489 = x10489
+	z10490 = x10490
+	z10491 = x10491
+	z10492 = x10492
+	z10493 = x10493
+	z10494 = x10494
+	z10495 = x10495
+	z10496 = x10496
+	z10497 = x10497
+	z10498 = x10498
+	z10499 = x10499
+	z10500 = x10500
+	z10501 = x10501
+	z10502 = x10502
+	z10503 = x10503
+	z10504 = x10504
+	z10505 = x10505
+	z10506 = x10506
+	z10507 = x10507
+	z10508 = x10508
+	z10509 = x10509
+	z10510 = x10510
+	z10511 = x10511
+	z10512 = x10512
+	z10513 = x10513
+	z10514 = x10514
+	z10515 = x10515
+	z10516 = x10516
+	z10517 = x10517
+	z10518 = x10518
+	z10519 = x10519
+	z10520 = x10520
+	z10521 = x10521
+	z10522 = x10522
+	z10523 = x10523
+	z10524 = x10524
+	z10525 = x10525
+	z10526 = x10526
+	z10527 = x10527
+	z10528 = x10528
+	z10529 = x10529
+	z10530 = x10530
+	z10531 = x10531
+	z10532 = x10532
+	z10533 = x10533
+	z10534 = x10534
+	z10535 = x10535
+	z10536 = x10536
+	z10537 = x10537
+	z10538 = x10538
+	z10539 = x10539
+	z10540 = x10540
+	z10541 = x10541
+	z10542 = x10542
+	z10543 = x10543
+	z10544 = x10544
+	z10545 = x10545
+	z10546 = x10546
+	z10547 = x10547
+	z10548 = x10548
+	z10549 = x10549
+	z10550 = x10550
+	z10551 = x10551
+	z10552 = x10552
+	z10553 = x10553
+	z10554 = x10554
+	z10555 = x10555
+	z10556 = x10556
+	z10557 = x10557
+	z10558 = x10558
+	z10559 = x10559
+	z10560 = x10560
+	z10561 = x10561
+	z10562 = x10562
+	z10563 = x10563
+	z10564 = x10564
+	z10565 = x10565
+	z10566 = x10566
+	z10567 = x10567
+	z10568 = x10568
+	z10569 = x10569
+	z10570 = x10570
+	z10571 = x10571
+	z10572 = x10572
+	z10573 = x10573
+	z10574 = x10574
+	z10575 = x10575
+	z10576 = x10576
+	z10577 = x10577
+	z10578 = x10578
+	z10579 = x10579
+	z10580 = x10580
+	z10581 = x10581
+	z10582 = x10582
+	z10583 = x10583
+	z10584 = x10584
+	z10585 = x10585
+	z10586 = x10586
+	z10587 = x10587
+	z10588 = x10588
+	z10589 = x10589
+	z10590 = x10590
+	z10591 = x10591
+	z10592 = x10592
+	z10593 = x10593
+	z10594 = x10594
+	z10595 = x10595
+	z10596 = x10596
+	z10597 = x10597
+	z10598 = x10598
+	z10599 = x10599
+	z10600 = x10600
+	z10601 = x10601
+	z10602 = x10602
+	z10603 = x10603
+	z10604 = x10604
+	z10605 = x10605
+	z10606 = x10606
+	z10607 = x10607
+	z10608 = x10608
+	z10609 = x10609
+	z10610 = x10610
+	z10611 = x10611
+	z10612 = x10612
+	z10613 = x10613
+	z10614 = x10614
+	z10615 = x10615
+	z10616 = x10616
+	z10617 = x10617
+	z10618 = x10618
+	z10619 = x10619
+	z10620 = x10620
+	z10621 = x10621
+	z10622 = x10622
+	z10623 = x10623
+	z10624 = x10624
+	z10625 = x10625
+	z10626 = x10626
+	z10627 = x10627
+	z10628 = x10628
+	z10629 = x10629
+	z10630 = x10630
+	z10631 = x10631
+	z10632 = x10632
+	z10633 = x10633
+	z10634 = x10634
+	z10635 = x10635
+	z10636 = x10636
+	z10637 = x10637
+	z10638 = x10638
+	z10639 = x10639
+	z10640 = x10640
+	z10641 = x10641
+	z10642 = x10642
+	z10643 = x10643
+	z10644 = x10644
+	z10645 = x10645
+	z10646 = x10646
+	z10647 = x10647
+	z10648 = x10648
+	z10649 = x10649
+	z10650 = x10650
+	z10651 = x10651
+	z10652 = x10652
+	z10653 = x10653
+	z10654 = x10654
+	z10655 = x10655
+	z10656 = x10656
+	z10657 = x10657
+	z10658 = x10658
+	z10659 = x10659
+	z10660 = x10660
+	z10661 = x10661
+	z10662 = x10662
+	z10663 = x10663
+	z10664 = x10664
+	z10665 = x10665
+	z10666 = x10666
+	z10667 = x10667
+	z10668 = x10668
+	z10669 = x10669
+	z10670 = x10670
+	z10671 = x10671
+	z10672 = x10672
+	z10673 = x10673
+	z10674 = x10674
+	z10675 = x10675
+	z10676 = x10676
+	z10677 = x10677
+	z10678 = x10678
+	z10679 = x10679
+	z10680 = x10680
+	z10681 = x10681
+	z10682 = x10682
+	z10683 = x10683
+	z10684 = x10684
+	z10685 = x10685
+	z10686 = x10686
+	z10687 = x10687
+	z10688 = x10688
+	z10689 = x10689
+	z10690 = x10690
+	z10691 = x10691
+	z10692 = x10692
+	z10693 = x10693
+	z10694 = x10694
+	z10695 = x10695
+	z10696 = x10696
+	z10697 = x10697
+	z10698 = x10698
+	z10699 = x10699
+	z10700 = x10700
+	z10701 = x10701
+	z10702 = x10702
+	z10703 = x10703
+	z10704 = x10704
+	z10705 = x10705
+	z10706 = x10706
+	z10707 = x10707
+	z10708 = x10708
+	z10709 = x10709
+	z10710 = x10710
+	z10711 = x10711
+	z10712 = x10712
+	z10713 = x10713
+	z10714 = x10714
+	z10715 = x10715
+	z10716 = x10716
+	z10717 = x10717
+	z10718 = x10718
+	z10719 = x10719
+	z10720 = x10720
+	z10721 = x10721
+	z10722 = x10722
+	z10723 = x10723
+	z10724 = x10724
+	z10725 = x10725
+	z10726 = x10726
+	z10727 = x10727
+	z10728 = x10728
+	z10729 = x10729
+	z10730 = x10730
+	z10731 = x10731
+	z10732 = x10732
+	z10733 = x10733
+	z10734 = x10734
+	z10735 = x10735
+	z10736 = x10736
+	z10737 = x10737
+	z10738 = x10738
+	z10739 = x10739
+	z10740 = x10740
+	z10741 = x10741
+	z10742 = x10742
+	z10743 = x10743
+	z10744 = x10744
+	z10745 = x10745
+	z10746 = x10746
+	z10747 = x10747
+	z10748 = x10748
+	z10749 = x10749
+	z10750 = x10750
+	z10751 = x10751
+	z10752 = x10752
+	z10753 = x10753
+	z10754 = x10754
+	z10755 = x10755
+	z10756 = x10756
+	z10757 = x10757
+	z10758 = x10758
+	z10759 = x10759
+	z10760 = x10760
+	z10761 = x10761
+	z10762 = x10762
+	z10763 = x10763
+	z10764 = x10764
+	z10765 = x10765
+	z10766 = x10766
+	z10767 = x10767
+	z10768 = x10768
+	z10769 = x10769
+	z10770 = x10770
+	z10771 = x10771
+	z10772 = x10772
+	z10773 = x10773
+	z10774 = x10774
+	z10775 = x10775
+	z10776 = x10776
+	z10777 = x10777
+	z10778 = x10778
+	z10779 = x10779
+	z10780 = x10780
+	z10781 = x10781
+	z10782 = x10782
+	z10783 = x10783
+	z10784 = x10784
+	z10785 = x10785
+	z10786 = x10786
+	z10787 = x10787
+	z10788 = x10788
+	z10789 = x10789
+	z10790 = x10790
+	z10791 = x10791
+	z10792 = x10792
+	z10793 = x10793
+	z10794 = x10794
+	z10795 = x10795
+	z10796 = x10796
+	z10797 = x10797
+	z10798 = x10798
+	z10799 = x10799
+	z10800 = x10800
+	z10801 = x10801
+	z10802 = x10802
+	z10803 = x10803
+	z10804 = x10804
+	z10805 = x10805
+	z10806 = x10806
+	z10807 = x10807
+	z10808 = x10808
+	z10809 = x10809
+	z10810 = x10810
+	z10811 = x10811
+	z10812 = x10812
+	z10813 = x10813
+	z10814 = x10814
+	z10815 = x10815
+	z10816 = x10816
+	z10817 = x10817
+	z10818 = x10818
+	z10819 = x10819
+	z10820 = x10820
+	z10821 = x10821
+	z10822 = x10822
+	z10823 = x10823
+	z10824 = x10824
+	z10825 = x10825
+	z10826 = x10826
+	z10827 = x10827
+	z10828 = x10828
+	z10829 = x10829
+	z10830 = x10830
+	z10831 = x10831
+	z10832 = x10832
+	z10833 = x10833
+	z10834 = x10834
+	z10835 = x10835
+	z10836 = x10836
+	z10837 = x10837
+	z10838 = x10838
+	z10839 = x10839
+	z10840 = x10840
+	z10841 = x10841
+	z10842 = x10842
+	z10843 = x10843
+	z10844 = x10844
+	z10845 = x10845
+	z10846 = x10846
+	z10847 = x10847
+	z10848 = x10848
+	z10849 = x10849
+	z10850 = x10850
+	z10851 = x10851
+	z10852 = x10852
+	z10853 = x10853
+	z10854 = x10854
+	z10855 = x10855
+	z10856 = x10856
+	z10857 = x10857
+	z10858 = x10858
+	z10859 = x10859
+	z10860 = x10860
+	z10861 = x10861
+	z10862 = x10862
+	z10863 = x10863
+	z10864 = x10864
+	z10865 = x10865
+	z10866 = x10866
+	z10867 = x10867
+	z10868 = x10868
+	z10869 = x10869
+	z10870 = x10870
+	z10871 = x10871
+	z10872 = x10872
+	z10873 = x10873
+	z10874 = x10874
+	z10875 = x10875
+	z10876 = x10876
+	z10877 = x10877
+	z10878 = x10878
+	z10879 = x10879
+	z10880 = x10880
+	z10881 = x10881
+	z10882 = x10882
+	z10883 = x10883
+	z10884 = x10884
+	z10885 = x10885
+	z10886 = x10886
+	z10887 = x10887
+	z10888 = x10888
+	z10889 = x10889
+	z10890 = x10890
+	z10891 = x10891
+	z10892 = x10892
+	z10893 = x10893
+	z10894 = x10894
+	z10895 = x10895
+	z10896 = x10896
+	z10897 = x10897
+	z10898 = x10898
+	z10899 = x10899
+	z10900 = x10900
+	z10901 = x10901
+	z10902 = x10902
+	z10903 = x10903
+	z10904 = x10904
+	z10905 = x10905
+	z10906 = x10906
+	z10907 = x10907
+	z10908 = x10908
+	z10909 = x10909
+	z10910 = x10910
+	z10911 = x10911
+	z10912 = x10912
+	z10913 = x10913
+	z10914 = x10914
+	z10915 = x10915
+	z10916 = x10916
+	z10917 = x10917
+	z10918 = x10918
+	z10919 = x10919
+	z10920 = x10920
+	z10921 = x10921
+	z10922 = x10922
+	z10923 = x10923
+	z10924 = x10924
+	z10925 = x10925
+	z10926 = x10926
+	z10927 = x10927
+	z10928 = x10928
+	z10929 = x10929
+	z10930 = x10930
+	z10931 = x10931
+	z10932 = x10932
+	z10933 = x10933
+	z10934 = x10934
+	z10935 = x10935
+	z10936 = x10936
+	z10937 = x10937
+	z10938 = x10938
+	z10939 = x10939
+	z10940 = x10940
+	z10941 = x10941
+	z10942 = x10942
+	z10943 = x10943
+	z10944 = x10944
+	z10945 = x10945
+	z10946 = x10946
+	z10947 = x10947
+	z10948 = x10948
+	z10949 = x10949
+	z10950 = x10950
+	z10951 = x10951
+	z10952 = x10952
+	z10953 = x10953
+	z10954 = x10954
+	z10955 = x10955
+	z10956 = x10956
+	z10957 = x10957
+	z10958 = x10958
+	z10959 = x10959
+	z10960 = x10960
+	z10961 = x10961
+	z10962 = x10962
+	z10963 = x10963
+	z10964 = x10964
+	z10965 = x10965
+	z10966 = x10966
+	z10967 = x10967
+	z10968 = x10968
+	z10969 = x10969
+	z10970 = x10970
+	z10971 = x10971
+	z10972 = x10972
+	z10973 = x10973
+	z10974 = x10974
+	z10975 = x10975
+	z10976 = x10976
+	z10977 = x10977
+	z10978 = x10978
+	z10979 = x10979
+	z10980 = x10980
+	z10981 = x10981
+	z10982 = x10982
+	z10983 = x10983
+	z10984 = x10984
+	z10985 = x10985
+	z10986 = x10986
+	z10987 = x10987
+	z10988 = x10988
+	z10989 = x10989
+	z10990 = x10990
+	z10991 = x10991
+	z10992 = x10992
+	z10993 = x10993
+	z10994 = x10994
+	z10995 = x10995
+	z10996 = x10996
+	z10997 = x10997
+	z10998 = x10998
+	z10999 = x10999
+	z11000 = x11000
+	z11001 = x11001
+	z11002 = x11002
+	z11003 = x11003
+	z11004 = x11004
+	z11005 = x11005
+	z11006 = x11006
+	z11007 = x11007
+	z11008 = x11008
+	z11009 = x11009
+	z11010 = x11010
+	z11011 = x11011
+	z11012 = x11012
+	z11013 = x11013
+	z11014 = x11014
+	z11015 = x11015
+	z11016 = x11016
+	z11017 = x11017
+	z11018 = x11018
+	z11019 = x11019
+	z11020 = x11020
+	z11021 = x11021
+	z11022 = x11022
+	z11023 = x11023
+	z11024 = x11024
+	z11025 = x11025
+	z11026 = x11026
+	z11027 = x11027
+	z11028 = x11028
+	z11029 = x11029
+	z11030 = x11030
+	z11031 = x11031
+	z11032 = x11032
+	z11033 = x11033
+	z11034 = x11034
+	z11035 = x11035
+	z11036 = x11036
+	z11037 = x11037
+	z11038 = x11038
+	z11039 = x11039
+	z11040 = x11040
+	z11041 = x11041
+	z11042 = x11042
+	z11043 = x11043
+	z11044 = x11044
+	z11045 = x11045
+	z11046 = x11046
+	z11047 = x11047
+	z11048 = x11048
+	z11049 = x11049
+	z11050 = x11050
+	z11051 = x11051
+	z11052 = x11052
+	z11053 = x11053
+	z11054 = x11054
+	z11055 = x11055
+	z11056 = x11056
+	z11057 = x11057
+	z11058 = x11058
+	z11059 = x11059
+	z11060 = x11060
+	z11061 = x11061
+	z11062 = x11062
+	z11063 = x11063
+	z11064 = x11064
+	z11065 = x11065
+	z11066 = x11066
+	z11067 = x11067
+	z11068 = x11068
+	z11069 = x11069
+	z11070 = x11070
+	z11071 = x11071
+	z11072 = x11072
+	z11073 = x11073
+	z11074 = x11074
+	z11075 = x11075
+	z11076 = x11076
+	z11077 = x11077
+	z11078 = x11078
+	z11079 = x11079
+	z11080 = x11080
+	z11081 = x11081
+	z11082 = x11082
+	z11083 = x11083
+	z11084 = x11084
+	z11085 = x11085
+	z11086 = x11086
+	z11087 = x11087
+	z11088 = x11088
+	z11089 = x11089
+	z11090 = x11090
+	z11091 = x11091
+	z11092 = x11092
+	z11093 = x11093
+	z11094 = x11094
+	z11095 = x11095
+	z11096 = x11096
+	z11097 = x11097
+	z11098 = x11098
+	z11099 = x11099
+	z11100 = x11100
+	z11101 = x11101
+	z11102 = x11102
+	z11103 = x11103
+	z11104 = x11104
+	z11105 = x11105
+	z11106 = x11106
+	z11107 = x11107
+	z11108 = x11108
+	z11109 = x11109
+	z11110 = x11110
+	z11111 = x11111
+	z11112 = x11112
+	z11113 = x11113
+	z11114 = x11114
+	z11115 = x11115
+	z11116 = x11116
+	z11117 = x11117
+	z11118 = x11118
+	z11119 = x11119
+	z11120 = x11120
+	z11121 = x11121
+	z11122 = x11122
+	z11123 = x11123
+	z11124 = x11124
+	z11125 = x11125
+	z11126 = x11126
+	z11127 = x11127
+	z11128 = x11128
+	z11129 = x11129
+	z11130 = x11130
+	z11131 = x11131
+	z11132 = x11132
+	z11133 = x11133
+	z11134 = x11134
+	z11135 = x11135
+	z11136 = x11136
+	z11137 = x11137
+	z11138 = x11138
+	z11139 = x11139
+	z11140 = x11140
+	z11141 = x11141
+	z11142 = x11142
+	z11143 = x11143
+	z11144 = x11144
+	z11145 = x11145
+	z11146 = x11146
+	z11147 = x11147
+	z11148 = x11148
+	z11149 = x11149
+	z11150 = x11150
+	z11151 = x11151
+	z11152 = x11152
+	z11153 = x11153
+	z11154 = x11154
+	z11155 = x11155
+	z11156 = x11156
+	z11157 = x11157
+	z11158 = x11158
+	z11159 = x11159
+	z11160 = x11160
+	z11161 = x11161
+	z11162 = x11162
+	z11163 = x11163
+	z11164 = x11164
+	z11165 = x11165
+	z11166 = x11166
+	z11167 = x11167
+	z11168 = x11168
+	z11169 = x11169
+	z11170 = x11170
+	z11171 = x11171
+	z11172 = x11172
+	z11173 = x11173
+	z11174 = x11174
+	z11175 = x11175
+	z11176 = x11176
+	z11177 = x11177
+	z11178 = x11178
+	z11179 = x11179
+	z11180 = x11180
+	z11181 = x11181
+	z11182 = x11182
+	z11183 = x11183
+	z11184 = x11184
+	z11185 = x11185
+	z11186 = x11186
+	z11187 = x11187
+	z11188 = x11188
+	z11189 = x11189
+	z11190 = x11190
+	z11191 = x11191
+	z11192 = x11192
+	z11193 = x11193
+	z11194 = x11194
+	z11195 = x11195
+	z11196 = x11196
+	z11197 = x11197
+	z11198 = x11198
+	z11199 = x11199
+	z11200 = x11200
+	z11201 = x11201
+	z11202 = x11202
+	z11203 = x11203
+	z11204 = x11204
+	z11205 = x11205
+	z11206 = x11206
+	z11207 = x11207
+	z11208 = x11208
+	z11209 = x11209
+	z11210 = x11210
+	z11211 = x11211
+	z11212 = x11212
+	z11213 = x11213
+	z11214 = x11214
+	z11215 = x11215
+	z11216 = x11216
+	z11217 = x11217
+	z11218 = x11218
+	z11219 = x11219
+	z11220 = x11220
+	z11221 = x11221
+	z11222 = x11222
+	z11223 = x11223
+	z11224 = x11224
+	z11225 = x11225
+	z11226 = x11226
+	z11227 = x11227
+	z11228 = x11228
+	z11229 = x11229
+	z11230 = x11230
+	z11231 = x11231
+	z11232 = x11232
+	z11233 = x11233
+	z11234 = x11234
+	z11235 = x11235
+	z11236 = x11236
+	z11237 = x11237
+	z11238 = x11238
+	z11239 = x11239
+	z11240 = x11240
+	z11241 = x11241
+	z11242 = x11242
+	z11243 = x11243
+	z11244 = x11244
+	z11245 = x11245
+	z11246 = x11246
+	z11247 = x11247
+	z11248 = x11248
+	z11249 = x11249
+	z11250 = x11250
+	z11251 = x11251
+	z11252 = x11252
+	z11253 = x11253
+	z11254 = x11254
+	z11255 = x11255
+	z11256 = x11256
+	z11257 = x11257
+	z11258 = x11258
+	z11259 = x11259
+	z11260 = x11260
+	z11261 = x11261
+	z11262 = x11262
+	z11263 = x11263
+	z11264 = x11264
+	z11265 = x11265
+	z11266 = x11266
+	z11267 = x11267
+	z11268 = x11268
+	z11269 = x11269
+	z11270 = x11270
+	z11271 = x11271
+	z11272 = x11272
+	z11273 = x11273
+	z11274 = x11274
+	z11275 = x11275
+	z11276 = x11276
+	z11277 = x11277
+	z11278 = x11278
+	z11279 = x11279
+	z11280 = x11280
+	z11281 = x11281
+	z11282 = x11282
+	z11283 = x11283
+	z11284 = x11284
+	z11285 = x11285
+	z11286 = x11286
+	z11287 = x11287
+	z11288 = x11288
+	z11289 = x11289
+	z11290 = x11290
+	z11291 = x11291
+	z11292 = x11292
+	z11293 = x11293
+	z11294 = x11294
+	z11295 = x11295
+	z11296 = x11296
+	z11297 = x11297
+	z11298 = x11298
+	z11299 = x11299
+	z11300 = x11300
+	z11301 = x11301
+	z11302 = x11302
+	z11303 = x11303
+	z11304 = x11304
+	z11305 = x11305
+	z11306 = x11306
+	z11307 = x11307
+	z11308 = x11308
+	z11309 = x11309
+	z11310 = x11310
+	z11311 = x11311
+	z11312 = x11312
+	z11313 = x11313
+	z11314 = x11314
+	z11315 = x11315
+	z11316 = x11316
+	z11317 = x11317
+	z11318 = x11318
+	z11319 = x11319
+	z11320 = x11320
+	z11321 = x11321
+	z11322 = x11322
+	z11323 = x11323
+	z11324 = x11324
+	z11325 = x11325
+	z11326 = x11326
+	z11327 = x11327
+	z11328 = x11328
+	z11329 = x11329
+	z11330 = x11330
+	z11331 = x11331
+	z11332 = x11332
+	z11333 = x11333
+	z11334 = x11334
+	z11335 = x11335
+	z11336 = x11336
+	z11337 = x11337
+	z11338 = x11338
+	z11339 = x11339
+	z11340 = x11340
+	z11341 = x11341
+	z11342 = x11342
+	z11343 = x11343
+	z11344 = x11344
+	z11345 = x11345
+	z11346 = x11346
+	z11347 = x11347
+	z11348 = x11348
+	z11349 = x11349
+	z11350 = x11350
+	z11351 = x11351
+	z11352 = x11352
+	z11353 = x11353
+	z11354 = x11354
+	z11355 = x11355
+	z11356 = x11356
+	z11357 = x11357
+	z11358 = x11358
+	z11359 = x11359
+	z11360 = x11360
+	z11361 = x11361
+	z11362 = x11362
+	z11363 = x11363
+	z11364 = x11364
+	z11365 = x11365
+	z11366 = x11366
+	z11367 = x11367
+	z11368 = x11368
+	z11369 = x11369
+	z11370 = x11370
+	z11371 = x11371
+	z11372 = x11372
+	z11373 = x11373
+	z11374 = x11374
+	z11375 = x11375
+	z11376 = x11376
+	z11377 = x11377
+	z11378 = x11378
+	z11379 = x11379
+	z11380 = x11380
+	z11381 = x11381
+	z11382 = x11382
+	z11383 = x11383
+	z11384 = x11384
+	z11385 = x11385
+	z11386 = x11386
+	z11387 = x11387
+	z11388 = x11388
+	z11389 = x11389
+	z11390 = x11390
+	z11391 = x11391
+	z11392 = x11392
+	z11393 = x11393
+	z11394 = x11394
+	z11395 = x11395
+	z11396 = x11396
+	z11397 = x11397
+	z11398 = x11398
+	z11399 = x11399
+	z11400 = x11400
+	z11401 = x11401
+	z11402 = x11402
+	z11403 = x11403
+	z11404 = x11404
+	z11405 = x11405
+	z11406 = x11406
+	z11407 = x11407
+	z11408 = x11408
+	z11409 = x11409
+	z11410 = x11410
+	z11411 = x11411
+	z11412 = x11412
+	z11413 = x11413
+	z11414 = x11414
+	z11415 = x11415
+	z11416 = x11416
+	z11417 = x11417
+	z11418 = x11418
+	z11419 = x11419
+	z11420 = x11420
+	z11421 = x11421
+	z11422 = x11422
+	z11423 = x11423
+	z11424 = x11424
+	z11425 = x11425
+	z11426 = x11426
+	z11427 = x11427
+	z11428 = x11428
+	z11429 = x11429
+	z11430 = x11430
+	z11431 = x11431
+	z11432 = x11432
+	z11433 = x11433
+	z11434 = x11434
+	z11435 = x11435
+	z11436 = x11436
+	z11437 = x11437
+	z11438 = x11438
+	z11439 = x11439
+	z11440 = x11440
+	z11441 = x11441
+	z11442 = x11442
+	z11443 = x11443
+	z11444 = x11444
+	z11445 = x11445
+	z11446 = x11446
+	z11447 = x11447
+	z11448 = x11448
+	z11449 = x11449
+	z11450 = x11450
+	z11451 = x11451
+	z11452 = x11452
+	z11453 = x11453
+	z11454 = x11454
+	z11455 = x11455
+	z11456 = x11456
+	z11457 = x11457
+	z11458 = x11458
+	z11459 = x11459
+	z11460 = x11460
+	z11461 = x11461
+	z11462 = x11462
+	z11463 = x11463
+	z11464 = x11464
+	z11465 = x11465
+	z11466 = x11466
+	z11467 = x11467
+	z11468 = x11468
+	z11469 = x11469
+	z11470 = x11470
+	z11471 = x11471
+	z11472 = x11472
+	z11473 = x11473
+	z11474 = x11474
+	z11475 = x11475
+	z11476 = x11476
+	z11477 = x11477
+	z11478 = x11478
+	z11479 = x11479
+	z11480 = x11480
+	z11481 = x11481
+	z11482 = x11482
+	z11483 = x11483
+	z11484 = x11484
+	z11485 = x11485
+	z11486 = x11486
+	z11487 = x11487
+	z11488 = x11488
+	z11489 = x11489
+	z11490 = x11490
+	z11491 = x11491
+	z11492 = x11492
+	z11493 = x11493
+	z11494 = x11494
+	z11495 = x11495
+	z11496 = x11496
+	z11497 = x11497
+	z11498 = x11498
+	z11499 = x11499
+	z11500 = x11500
+	z11501 = x11501
+	z11502 = x11502
+	z11503 = x11503
+	z11504 = x11504
+	z11505 = x11505
+	z11506 = x11506
+	z11507 = x11507
+	z11508 = x11508
+	z11509 = x11509
+	z11510 = x11510
+	z11511 = x11511
+	z11512 = x11512
+	z11513 = x11513
+	z11514 = x11514
+	z11515 = x11515
+	z11516 = x11516
+	z11517 = x11517
+	z11518 = x11518
+	z11519 = x11519
+	z11520 = x11520
+	z11521 = x11521
+	z11522 = x11522
+	z11523 = x11523
+	z11524 = x11524
+	z11525 = x11525
+	z11526 = x11526
+	z11527 = x11527
+	z11528 = x11528
+	z11529 = x11529
+	z11530 = x11530
+	z11531 = x11531
+	z11532 = x11532
+	z11533 = x11533
+	z11534 = x11534
+	z11535 = x11535
+	z11536 = x11536
+	z11537 = x11537
+	z11538 = x11538
+	z11539 = x11539
+	z11540 = x11540
+	z11541 = x11541
+	z11542 = x11542
+	z11543 = x11543
+	z11544 = x11544
+	z11545 = x11545
+	z11546 = x11546
+	z11547 = x11547
+	z11548 = x11548
+	z11549 = x11549
+	z11550 = x11550
+	z11551 = x11551
+	z11552 = x11552
+	z11553 = x11553
+	z11554 = x11554
+	z11555 = x11555
+	z11556 = x11556
+	z11557 = x11557
+	z11558 = x11558
+	z11559 = x11559
+	z11560 = x11560
+	z11561 = x11561
+	z11562 = x11562
+	z11563 = x11563
+	z11564 = x11564
+	z11565 = x11565
+	z11566 = x11566
+	z11567 = x11567
+	z11568 = x11568
+	z11569 = x11569
+	z11570 = x11570
+	z11571 = x11571
+	z11572 = x11572
+	z11573 = x11573
+	z11574 = x11574
+	z11575 = x11575
+	z11576 = x11576
+	z11577 = x11577
+	z11578 = x11578
+	z11579 = x11579
+	z11580 = x11580
+	z11581 = x11581
+	z11582 = x11582
+	z11583 = x11583
+	z11584 = x11584
+	z11585 = x11585
+	z11586 = x11586
+	z11587 = x11587
+	z11588 = x11588
+	z11589 = x11589
+	z11590 = x11590
+	z11591 = x11591
+	z11592 = x11592
+	z11593 = x11593
+	z11594 = x11594
+	z11595 = x11595
+	z11596 = x11596
+	z11597 = x11597
+	z11598 = x11598
+	z11599 = x11599
+	z11600 = x11600
+	z11601 = x11601
+	z11602 = x11602
+	z11603 = x11603
+	z11604 = x11604
+	z11605 = x11605
+	z11606 = x11606
+	z11607 = x11607
+	z11608 = x11608
+	z11609 = x11609
+	z11610 = x11610
+	z11611 = x11611
+	z11612 = x11612
+	z11613 = x11613
+	z11614 = x11614
+	z11615 = x11615
+	z11616 = x11616
+	z11617 = x11617
+	z11618 = x11618
+	z11619 = x11619
+	z11620 = x11620
+	z11621 = x11621
+	z11622 = x11622
+	z11623 = x11623
+	z11624 = x11624
+	z11625 = x11625
+	z11626 = x11626
+	z11627 = x11627
+	z11628 = x11628
+	z11629 = x11629
+	z11630 = x11630
+	z11631 = x11631
+	z11632 = x11632
+	z11633 = x11633
+	z11634 = x11634
+	z11635 = x11635
+	z11636 = x11636
+	z11637 = x11637
+	z11638 = x11638
+	z11639 = x11639
+	z11640 = x11640
+	z11641 = x11641
+	z11642 = x11642
+	z11643 = x11643
+	z11644 = x11644
+	z11645 = x11645
+	z11646 = x11646
+	z11647 = x11647
+	z11648 = x11648
+	z11649 = x11649
+	z11650 = x11650
+	z11651 = x11651
+	z11652 = x11652
+	z11653 = x11653
+	z11654 = x11654
+	z11655 = x11655
+	z11656 = x11656
+	z11657 = x11657
+	z11658 = x11658
+	z11659 = x11659
+	z11660 = x11660
+	z11661 = x11661
+	z11662 = x11662
+	z11663 = x11663
+	z11664 = x11664
+	z11665 = x11665
+	z11666 = x11666
+	z11667 = x11667
+	z11668 = x11668
+	z11669 = x11669
+	z11670 = x11670
+	z11671 = x11671
+	z11672 = x11672
+	z11673 = x11673
+	z11674 = x11674
+	z11675 = x11675
+	z11676 = x11676
+	z11677 = x11677
+	z11678 = x11678
+	z11679 = x11679
+	z11680 = x11680
+	z11681 = x11681
+	z11682 = x11682
+	z11683 = x11683
+	z11684 = x11684
+	z11685 = x11685
+	z11686 = x11686
+	z11687 = x11687
+	z11688 = x11688
+	z11689 = x11689
+	z11690 = x11690
+	z11691 = x11691
+	z11692 = x11692
+	z11693 = x11693
+	z11694 = x11694
+	z11695 = x11695
+	z11696 = x11696
+	z11697 = x11697
+	z11698 = x11698
+	z11699 = x11699
+	z11700 = x11700
+	z11701 = x11701
+	z11702 = x11702
+	z11703 = x11703
+	z11704 = x11704
+	z11705 = x11705
+	z11706 = x11706
+	z11707 = x11707
+	z11708 = x11708
+	z11709 = x11709
+	z11710 = x11710
+	z11711 = x11711
+	z11712 = x11712
+	z11713 = x11713
+	z11714 = x11714
+	z11715 = x11715
+	z11716 = x11716
+	z11717 = x11717
+	z11718 = x11718
+	z11719 = x11719
+	z11720 = x11720
+	z11721 = x11721
+	z11722 = x11722
+	z11723 = x11723
+	z11724 = x11724
+	z11725 = x11725
+	z11726 = x11726
+	z11727 = x11727
+	z11728 = x11728
+	z11729 = x11729
+	z11730 = x11730
+	z11731 = x11731
+	z11732 = x11732
+	z11733 = x11733
+	z11734 = x11734
+	z11735 = x11735
+	z11736 = x11736
+	z11737 = x11737
+	z11738 = x11738
+	z11739 = x11739
+	z11740 = x11740
+	z11741 = x11741
+	z11742 = x11742
+	z11743 = x11743
+	z11744 = x11744
+	z11745 = x11745
+	z11746 = x11746
+	z11747 = x11747
+	z11748 = x11748
+	z11749 = x11749
+	z11750 = x11750
+	z11751 = x11751
+	z11752 = x11752
+	z11753 = x11753
+	z11754 = x11754
+	z11755 = x11755
+	z11756 = x11756
+	z11757 = x11757
+	z11758 = x11758
+	z11759 = x11759
+	z11760 = x11760
+	z11761 = x11761
+	z11762 = x11762
+	z11763 = x11763
+	z11764 = x11764
+	z11765 = x11765
+	z11766 = x11766
+	z11767 = x11767
+	z11768 = x11768
+	z11769 = x11769
+	z11770 = x11770
+	z11771 = x11771
+	z11772 = x11772
+	z11773 = x11773
+	z11774 = x11774
+	z11775 = x11775
+	z11776 = x11776
+	z11777 = x11777
+	z11778 = x11778
+	z11779 = x11779
+	z11780 = x11780
+	z11781 = x11781
+	z11782 = x11782
+	z11783 = x11783
+	z11784 = x11784
+	z11785 = x11785
+	z11786 = x11786
+	z11787 = x11787
+	z11788 = x11788
+	z11789 = x11789
+	z11790 = x11790
+	z11791 = x11791
+	z11792 = x11792
+	z11793 = x11793
+	z11794 = x11794
+	z11795 = x11795
+	z11796 = x11796
+	z11797 = x11797
+	z11798 = x11798
+	z11799 = x11799
+	z11800 = x11800
+	z11801 = x11801
+	z11802 = x11802
+	z11803 = x11803
+	z11804 = x11804
+	z11805 = x11805
+	z11806 = x11806
+	z11807 = x11807
+	z11808 = x11808
+	z11809 = x11809
+	z11810 = x11810
+	z11811 = x11811
+	z11812 = x11812
+	z11813 = x11813
+	z11814 = x11814
+	z11815 = x11815
+	z11816 = x11816
+	z11817 = x11817
+	z11818 = x11818
+	z11819 = x11819
+	z11820 = x11820
+	z11821 = x11821
+	z11822 = x11822
+	z11823 = x11823
+	z11824 = x11824
+	z11825 = x11825
+	z11826 = x11826
+	z11827 = x11827
+	z11828 = x11828
+	z11829 = x11829
+	z11830 = x11830
+	z11831 = x11831
+	z11832 = x11832
+	z11833 = x11833
+	z11834 = x11834
+	z11835 = x11835
+	z11836 = x11836
+	z11837 = x11837
+	z11838 = x11838
+	z11839 = x11839
+	z11840 = x11840
+	z11841 = x11841
+	z11842 = x11842
+	z11843 = x11843
+	z11844 = x11844
+	z11845 = x11845
+	z11846 = x11846
+	z11847 = x11847
+	z11848 = x11848
+	z11849 = x11849
+	z11850 = x11850
+	z11851 = x11851
+	z11852 = x11852
+	z11853 = x11853
+	z11854 = x11854
+	z11855 = x11855
+	z11856 = x11856
+	z11857 = x11857
+	z11858 = x11858
+	z11859 = x11859
+	z11860 = x11860
+	z11861 = x11861
+	z11862 = x11862
+	z11863 = x11863
+	z11864 = x11864
+	z11865 = x11865
+	z11866 = x11866
+	z11867 = x11867
+	z11868 = x11868
+	z11869 = x11869
+	z11870 = x11870
+	z11871 = x11871
+	z11872 = x11872
+	z11873 = x11873
+	z11874 = x11874
+	z11875 = x11875
+	z11876 = x11876
+	z11877 = x11877
+	z11878 = x11878
+	z11879 = x11879
+	z11880 = x11880
+	z11881 = x11881
+	z11882 = x11882
+	z11883 = x11883
+	z11884 = x11884
+	z11885 = x11885
+	z11886 = x11886
+	z11887 = x11887
+	z11888 = x11888
+	z11889 = x11889
+	z11890 = x11890
+	z11891 = x11891
+	z11892 = x11892
+	z11893 = x11893
+	z11894 = x11894
+	z11895 = x11895
+	z11896 = x11896
+	z11897 = x11897
+	z11898 = x11898
+	z11899 = x11899
+	z11900 = x11900
+	z11901 = x11901
+	z11902 = x11902
+	z11903 = x11903
+	z11904 = x11904
+	z11905 = x11905
+	z11906 = x11906
+	z11907 = x11907
+	z11908 = x11908
+	z11909 = x11909
+	z11910 = x11910
+	z11911 = x11911
+	z11912 = x11912
+	z11913 = x11913
+	z11914 = x11914
+	z11915 = x11915
+	z11916 = x11916
+	z11917 = x11917
+	z11918 = x11918
+	z11919 = x11919
+	z11920 = x11920
+	z11921 = x11921
+	z11922 = x11922
+	z11923 = x11923
+	z11924 = x11924
+	z11925 = x11925
+	z11926 = x11926
+	z11927 = x11927
+	z11928 = x11928
+	z11929 = x11929
+	z11930 = x11930
+	z11931 = x11931
+	z11932 = x11932
+	z11933 = x11933
+	z11934 = x11934
+	z11935 = x11935
+	z11936 = x11936
+	z11937 = x11937
+	z11938 = x11938
+	z11939 = x11939
+	z11940 = x11940
+	z11941 = x11941
+	z11942 = x11942
+	z11943 = x11943
+	z11944 = x11944
+	z11945 = x11945
+	z11946 = x11946
+	z11947 = x11947
+	z11948 = x11948
+	z11949 = x11949
+	z11950 = x11950
+	z11951 = x11951
+	z11952 = x11952
+	z11953 = x11953
+	z11954 = x11954
+	z11955 = x11955
+	z11956 = x11956
+	z11957 = x11957
+	z11958 = x11958
+	z11959 = x11959
+	z11960 = x11960
+	z11961 = x11961
+	z11962 = x11962
+	z11963 = x11963
+	z11964 = x11964
+	z11965 = x11965
+	z11966 = x11966
+	z11967 = x11967
+	z11968 = x11968
+	z11969 = x11969
+	z11970 = x11970
+	z11971 = x11971
+	z11972 = x11972
+	z11973 = x11973
+	z11974 = x11974
+	z11975 = x11975
+	z11976 = x11976
+	z11977 = x11977
+	z11978 = x11978
+	z11979 = x11979
+	z11980 = x11980
+	z11981 = x11981
+	z11982 = x11982
+	z11983 = x11983
+	z11984 = x11984
+	z11985 = x11985
+	z11986 = x11986
+	z11987 = x11987
+	z11988 = x11988
+	z11989 = x11989
+	z11990 = x11990
+	z11991 = x11991
+	z11992 = x11992
+	z11993 = x11993
+	z11994 = x11994
+	z11995 = x11995
+	z11996 = x11996
+	z11997 = x11997
+	z11998 = x11998
+	z11999 = x11999
+	z12000 = x12000
+	z12001 = x12001
+	z12002 = x12002
+	z12003 = x12003
+	z12004 = x12004
+	z12005 = x12005
+	z12006 = x12006
+	z12007 = x12007
+	z12008 = x12008
+	z12009 = x12009
+	z12010 = x12010
+	z12011 = x12011
+	z12012 = x12012
+	z12013 = x12013
+	z12014 = x12014
+	z12015 = x12015
+	z12016 = x12016
+	z12017 = x12017
+	z12018 = x12018
+	z12019 = x12019
+	z12020 = x12020
+	z12021 = x12021
+	z12022 = x12022
+	z12023 = x12023
+	z12024 = x12024
+	z12025 = x12025
+	z12026 = x12026
+	z12027 = x12027
+	z12028 = x12028
+	z12029 = x12029
+	z12030 = x12030
+	z12031 = x12031
+	z12032 = x12032
+	z12033 = x12033
+	z12034 = x12034
+	z12035 = x12035
+	z12036 = x12036
+	z12037 = x12037
+	z12038 = x12038
+	z12039 = x12039
+	z12040 = x12040
+	z12041 = x12041
+	z12042 = x12042
+	z12043 = x12043
+	z12044 = x12044
+	z12045 = x12045
+	z12046 = x12046
+	z12047 = x12047
+	z12048 = x12048
+	z12049 = x12049
+	z12050 = x12050
+	z12051 = x12051
+	z12052 = x12052
+	z12053 = x12053
+	z12054 = x12054
+	z12055 = x12055
+	z12056 = x12056
+	z12057 = x12057
+	z12058 = x12058
+	z12059 = x12059
+	z12060 = x12060
+	z12061 = x12061
+	z12062 = x12062
+	z12063 = x12063
+	z12064 = x12064
+	z12065 = x12065
+	z12066 = x12066
+	z12067 = x12067
+	z12068 = x12068
+	z12069 = x12069
+	z12070 = x12070
+	z12071 = x12071
+	z12072 = x12072
+	z12073 = x12073
+	z12074 = x12074
+	z12075 = x12075
+	z12076 = x12076
+	z12077 = x12077
+	z12078 = x12078
+	z12079 = x12079
+	z12080 = x12080
+	z12081 = x12081
+	z12082 = x12082
+	z12083 = x12083
+	z12084 = x12084
+	z12085 = x12085
+	z12086 = x12086
+	z12087 = x12087
+	z12088 = x12088
+	z12089 = x12089
+	z12090 = x12090
+	z12091 = x12091
+	z12092 = x12092
+	z12093 = x12093
+	z12094 = x12094
+	z12095 = x12095
+	z12096 = x12096
+	z12097 = x12097
+	z12098 = x12098
+	z12099 = x12099
+	z12100 = x12100
+	z12101 = x12101
+	z12102 = x12102
+	z12103 = x12103
+	z12104 = x12104
+	z12105 = x12105
+	z12106 = x12106
+	z12107 = x12107
+	z12108 = x12108
+	z12109 = x12109
+	z12110 = x12110
+	z12111 = x12111
+	z12112 = x12112
+	z12113 = x12113
+	z12114 = x12114
+	z12115 = x12115
+	z12116 = x12116
+	z12117 = x12117
+	z12118 = x12118
+	z12119 = x12119
+	z12120 = x12120
+	z12121 = x12121
+	z12122 = x12122
+	z12123 = x12123
+	z12124 = x12124
+	z12125 = x12125
+	z12126 = x12126
+	z12127 = x12127
+	z12128 = x12128
+	z12129 = x12129
+	z12130 = x12130
+	z12131 = x12131
+	z12132 = x12132
+	z12133 = x12133
+	z12134 = x12134
+	z12135 = x12135
+	z12136 = x12136
+	z12137 = x12137
+	z12138 = x12138
+	z12139 = x12139
+	z12140 = x12140
+	z12141 = x12141
+	z12142 = x12142
+	z12143 = x12143
+	z12144 = x12144
+	z12145 = x12145
+	z12146 = x12146
+	z12147 = x12147
+	z12148 = x12148
+	z12149 = x12149
+	z12150 = x12150
+	z12151 = x12151
+	z12152 = x12152
+	z12153 = x12153
+	z12154 = x12154
+	z12155 = x12155
+	z12156 = x12156
+	z12157 = x12157
+	z12158 = x12158
+	z12159 = x12159
+	z12160 = x12160
+	z12161 = x12161
+	z12162 = x12162
+	z12163 = x12163
+	z12164 = x12164
+	z12165 = x12165
+	z12166 = x12166
+	z12167 = x12167
+	z12168 = x12168
+	z12169 = x12169
+	z12170 = x12170
+	z12171 = x12171
+	z12172 = x12172
+	z12173 = x12173
+	z12174 = x12174
+	z12175 = x12175
+	z12176 = x12176
+	z12177 = x12177
+	z12178 = x12178
+	z12179 = x12179
+	z12180 = x12180
+	z12181 = x12181
+	z12182 = x12182
+	z12183 = x12183
+	z12184 = x12184
+	z12185 = x12185
+	z12186 = x12186
+	z12187 = x12187
+	z12188 = x12188
+	z12189 = x12189
+	z12190 = x12190
+	z12191 = x12191
+	z12192 = x12192
+	z12193 = x12193
+	z12194 = x12194
+	z12195 = x12195
+	z12196 = x12196
+	z12197 = x12197
+	z12198 = x12198
+	z12199 = x12199
+	z12200 = x12200
+	z12201 = x12201
+	z12202 = x12202
+	z12203 = x12203
+	z12204 = x12204
+	z12205 = x12205
+	z12206 = x12206
+	z12207 = x12207
+	z12208 = x12208
+	z12209 = x12209
+	z12210 = x12210
+	z12211 = x12211
+	z12212 = x12212
+	z12213 = x12213
+	z12214 = x12214
+	z12215 = x12215
+	z12216 = x12216
+	z12217 = x12217
+	z12218 = x12218
+	z12219 = x12219
+	z12220 = x12220
+	z12221 = x12221
+	z12222 = x12222
+	z12223 = x12223
+	z12224 = x12224
+	z12225 = x12225
+	z12226 = x12226
+	z12227 = x12227
+	z12228 = x12228
+	z12229 = x12229
+	z12230 = x12230
+	z12231 = x12231
+	z12232 = x12232
+	z12233 = x12233
+	z12234 = x12234
+	z12235 = x12235
+	z12236 = x12236
+	z12237 = x12237
+	z12238 = x12238
+	z12239 = x12239
+	z12240 = x12240
+	z12241 = x12241
+	z12242 = x12242
+	z12243 = x12243
+	z12244 = x12244
+	z12245 = x12245
+	z12246 = x12246
+	z12247 = x12247
+	z12248 = x12248
+	z12249 = x12249
+	z12250 = x12250
+	z12251 = x12251
+	z12252 = x12252
+	z12253 = x12253
+	z12254 = x12254
+	z12255 = x12255
+	z12256 = x12256
+	z12257 = x12257
+	z12258 = x12258
+	z12259 = x12259
+	z12260 = x12260
+	z12261 = x12261
+	z12262 = x12262
+	z12263 = x12263
+	z12264 = x12264
+	z12265 = x12265
+	z12266 = x12266
+	z12267 = x12267
+	z12268 = x12268
+	z12269 = x12269
+	z12270 = x12270
+	z12271 = x12271
+	z12272 = x12272
+	z12273 = x12273
+	z12274 = x12274
+	z12275 = x12275
+	z12276 = x12276
+	z12277 = x12277
+	z12278 = x12278
+	z12279 = x12279
+	z12280 = x12280
+	z12281 = x12281
+	z12282 = x12282
+	z12283 = x12283
+	z12284 = x12284
+	z12285 = x12285
+	z12286 = x12286
+	z12287 = x12287
+	z12288 = x12288
+	z12289 = x12289
+	z12290 = x12290
+	z12291 = x12291
+	z12292 = x12292
+	z12293 = x12293
+	z12294 = x12294
+	z12295 = x12295
+	z12296 = x12296
+	z12297 = x12297
+	z12298 = x12298
+	z12299 = x12299
+	z12300 = x12300
+	z12301 = x12301
+	z12302 = x12302
+	z12303 = x12303
+	z12304 = x12304
+	z12305 = x12305
+	z12306 = x12306
+	z12307 = x12307
+	z12308 = x12308
+	z12309 = x12309
+	z12310 = x12310
+	z12311 = x12311
+	z12312 = x12312
+	z12313 = x12313
+	z12314 = x12314
+	z12315 = x12315
+	z12316 = x12316
+	z12317 = x12317
+	z12318 = x12318
+	z12319 = x12319
+	z12320 = x12320
+	z12321 = x12321
+	z12322 = x12322
+	z12323 = x12323
+	z12324 = x12324
+	z12325 = x12325
+	z12326 = x12326
+	z12327 = x12327
+	z12328 = x12328
+	z12329 = x12329
+	z12330 = x12330
+	z12331 = x12331
+	z12332 = x12332
+	z12333 = x12333
+	z12334 = x12334
+	z12335 = x12335
+	z12336 = x12336
+	z12337 = x12337
+	z12338 = x12338
+	z12339 = x12339
+	z12340 = x12340
+	z12341 = x12341
+	z12342 = x12342
+	z12343 = x12343
+	z12344 = x12344
+	z12345 = x12345
+	z12346 = x12346
+	z12347 = x12347
+	z12348 = x12348
+	z12349 = x12349
+	z12350 = x12350
+	z12351 = x12351
+	z12352 = x12352
+	z12353 = x12353
+	z12354 = x12354
+	z12355 = x12355
+	z12356 = x12356
+	z12357 = x12357
+	z12358 = x12358
+	z12359 = x12359
+	z12360 = x12360
+	z12361 = x12361
+	z12362 = x12362
+	z12363 = x12363
+	z12364 = x12364
+	z12365 = x12365
+	z12366 = x12366
+	z12367 = x12367
+	z12368 = x12368
+	z12369 = x12369
+	z12370 = x12370
+	z12371 = x12371
+	z12372 = x12372
+	z12373 = x12373
+	z12374 = x12374
+	z12375 = x12375
+	z12376 = x12376
+	z12377 = x12377
+	z12378 = x12378
+	z12379 = x12379
+	z12380 = x12380
+	z12381 = x12381
+	z12382 = x12382
+	z12383 = x12383
+	z12384 = x12384
+	z12385 = x12385
+	z12386 = x12386
+	z12387 = x12387
+	z12388 = x12388
+	z12389 = x12389
+	z12390 = x12390
+	z12391 = x12391
+	z12392 = x12392
+	z12393 = x12393
+	z12394 = x12394
+	z12395 = x12395
+	z12396 = x12396
+	z12397 = x12397
+	z12398 = x12398
+	z12399 = x12399
+	z12400 = x12400
+	z12401 = x12401
+	z12402 = x12402
+	z12403 = x12403
+	z12404 = x12404
+	z12405 = x12405
+	z12406 = x12406
+	z12407 = x12407
+	z12408 = x12408
+	z12409 = x12409
+	z12410 = x12410
+	z12411 = x12411
+	z12412 = x12412
+	z12413 = x12413
+	z12414 = x12414
+	z12415 = x12415
+	z12416 = x12416
+	z12417 = x12417
+	z12418 = x12418
+	z12419 = x12419
+	z12420 = x12420
+	z12421 = x12421
+	z12422 = x12422
+	z12423 = x12423
+	z12424 = x12424
+	z12425 = x12425
+	z12426 = x12426
+	z12427 = x12427
+	z12428 = x12428
+	z12429 = x12429
+	z12430 = x12430
+	z12431 = x12431
+	z12432 = x12432
+	z12433 = x12433
+	z12434 = x12434
+	z12435 = x12435
+	z12436 = x12436
+	z12437 = x12437
+	z12438 = x12438
+	z12439 = x12439
+	z12440 = x12440
+	z12441 = x12441
+	z12442 = x12442
+	z12443 = x12443
+	z12444 = x12444
+	z12445 = x12445
+	z12446 = x12446
+	z12447 = x12447
+	z12448 = x12448
+	z12449 = x12449
+	z12450 = x12450
+	z12451 = x12451
+	z12452 = x12452
+	z12453 = x12453
+	z12454 = x12454
+	z12455 = x12455
+	z12456 = x12456
+	z12457 = x12457
+	z12458 = x12458
+	z12459 = x12459
+	z12460 = x12460
+	z12461 = x12461
+	z12462 = x12462
+	z12463 = x12463
+	z12464 = x12464
+	z12465 = x12465
+	z12466 = x12466
+	z12467 = x12467
+	z12468 = x12468
+	z12469 = x12469
+	z12470 = x12470
+	z12471 = x12471
+	z12472 = x12472
+	z12473 = x12473
+	z12474 = x12474
+	z12475 = x12475
+	z12476 = x12476
+	z12477 = x12477
+	z12478 = x12478
+	z12479 = x12479
+	z12480 = x12480
+	z12481 = x12481
+	z12482 = x12482
+	z12483 = x12483
+	z12484 = x12484
+	z12485 = x12485
+	z12486 = x12486
+	z12487 = x12487
+	z12488 = x12488
+	z12489 = x12489
+	z12490 = x12490
+	z12491 = x12491
+	z12492 = x12492
+	z12493 = x12493
+	z12494 = x12494
+	z12495 = x12495
+	z12496 = x12496
+	z12497 = x12497
+	z12498 = x12498
+	z12499 = x12499
+	z12500 = x12500
+	z12501 = x12501
+	z12502 = x12502
+	z12503 = x12503
+	z12504 = x12504
+	z12505 = x12505
+	z12506 = x12506
+	z12507 = x12507
+	z12508 = x12508
+	z12509 = x12509
+	z12510 = x12510
+	z12511 = x12511
+	z12512 = x12512
+	z12513 = x12513
+	z12514 = x12514
+	z12515 = x12515
+	z12516 = x12516
+	z12517 = x12517
+	z12518 = x12518
+	z12519 = x12519
+	z12520 = x12520
+	z12521 = x12521
+	z12522 = x12522
+	z12523 = x12523
+	z12524 = x12524
+	z12525 = x12525
+	z12526 = x12526
+	z12527 = x12527
+	z12528 = x12528
+	z12529 = x12529
+	z12530 = x12530
+	z12531 = x12531
+	z12532 = x12532
+	z12533 = x12533
+	z12534 = x12534
+	z12535 = x12535
+	z12536 = x12536
+	z12537 = x12537
+	z12538 = x12538
+	z12539 = x12539
+	z12540 = x12540
+	z12541 = x12541
+	z12542 = x12542
+	z12543 = x12543
+	z12544 = x12544
+	z12545 = x12545
+	z12546 = x12546
+	z12547 = x12547
+	z12548 = x12548
+	z12549 = x12549
+	z12550 = x12550
+	z12551 = x12551
+	z12552 = x12552
+	z12553 = x12553
+	z12554 = x12554
+	z12555 = x12555
+	z12556 = x12556
+	z12557 = x12557
+	z12558 = x12558
+	z12559 = x12559
+	z12560 = x12560
+	z12561 = x12561
+	z12562 = x12562
+	z12563 = x12563
+	z12564 = x12564
+	z12565 = x12565
+	z12566 = x12566
+	z12567 = x12567
+	z12568 = x12568
+	z12569 = x12569
+	z12570 = x12570
+	z12571 = x12571
+	z12572 = x12572
+	z12573 = x12573
+	z12574 = x12574
+	z12575 = x12575
+	z12576 = x12576
+	z12577 = x12577
+	z12578 = x12578
+	z12579 = x12579
+	z12580 = x12580
+	z12581 = x12581
+	z12582 = x12582
+	z12583 = x12583
+	z12584 = x12584
+	z12585 = x12585
+	z12586 = x12586
+	z12587 = x12587
+	z12588 = x12588
+	z12589 = x12589
+	z12590 = x12590
+	z12591 = x12591
+	z12592 = x12592
+	z12593 = x12593
+	z12594 = x12594
+	z12595 = x12595
+	z12596 = x12596
+	z12597 = x12597
+	z12598 = x12598
+	z12599 = x12599
+	z12600 = x12600
+	z12601 = x12601
+	z12602 = x12602
+	z12603 = x12603
+	z12604 = x12604
+	z12605 = x12605
+	z12606 = x12606
+	z12607 = x12607
+	z12608 = x12608
+	z12609 = x12609
+	z12610 = x12610
+	z12611 = x12611
+	z12612 = x12612
+	z12613 = x12613
+	z12614 = x12614
+	z12615 = x12615
+	z12616 = x12616
+	z12617 = x12617
+	z12618 = x12618
+	z12619 = x12619
+	z12620 = x12620
+	z12621 = x12621
+	z12622 = x12622
+	z12623 = x12623
+	z12624 = x12624
+	z12625 = x12625
+	z12626 = x12626
+	z12627 = x12627
+	z12628 = x12628
+	z12629 = x12629
+	z12630 = x12630
+	z12631 = x12631
+	z12632 = x12632
+	z12633 = x12633
+	z12634 = x12634
+	z12635 = x12635
+	z12636 = x12636
+	z12637 = x12637
+	z12638 = x12638
+	z12639 = x12639
+	z12640 = x12640
+	z12641 = x12641
+	z12642 = x12642
+	z12643 = x12643
+	z12644 = x12644
+	z12645 = x12645
+	z12646 = x12646
+	z12647 = x12647
+	z12648 = x12648
+	z12649 = x12649
+	z12650 = x12650
+	z12651 = x12651
+	z12652 = x12652
+	z12653 = x12653
+	z12654 = x12654
+	z12655 = x12655
+	z12656 = x12656
+	z12657 = x12657
+	z12658 = x12658
+	z12659 = x12659
+	z12660 = x12660
+	z12661 = x12661
+	z12662 = x12662
+	z12663 = x12663
+	z12664 = x12664
+	z12665 = x12665
+	z12666 = x12666
+	z12667 = x12667
+	z12668 = x12668
+	z12669 = x12669
+	z12670 = x12670
+	z12671 = x12671
+	z12672 = x12672
+	z12673 = x12673
+	z12674 = x12674
+	z12675 = x12675
+	z12676 = x12676
+	z12677 = x12677
+	z12678 = x12678
+	z12679 = x12679
+	z12680 = x12680
+	z12681 = x12681
+	z12682 = x12682
+	z12683 = x12683
+	z12684 = x12684
+	z12685 = x12685
+	z12686 = x12686
+	z12687 = x12687
+	z12688 = x12688
+	z12689 = x12689
+	z12690 = x12690
+	z12691 = x12691
+	z12692 = x12692
+	z12693 = x12693
+	z12694 = x12694
+	z12695 = x12695
+	z12696 = x12696
+	z12697 = x12697
+	z12698 = x12698
+	z12699 = x12699
+	z12700 = x12700
+	z12701 = x12701
+	z12702 = x12702
+	z12703 = x12703
+	z12704 = x12704
+	z12705 = x12705
+	z12706 = x12706
+	z12707 = x12707
+	z12708 = x12708
+	z12709 = x12709
+	z12710 = x12710
+	z12711 = x12711
+	z12712 = x12712
+	z12713 = x12713
+	z12714 = x12714
+	z12715 = x12715
+	z12716 = x12716
+	z12717 = x12717
+	z12718 = x12718
+	z12719 = x12719
+	z12720 = x12720
+	z12721 = x12721
+	z12722 = x12722
+	z12723 = x12723
+	z12724 = x12724
+	z12725 = x12725
+	z12726 = x12726
+	z12727 = x12727
+	z12728 = x12728
+	z12729 = x12729
+	z12730 = x12730
+	z12731 = x12731
+	z12732 = x12732
+	z12733 = x12733
+	z12734 = x12734
+	z12735 = x12735
+	z12736 = x12736
+	z12737 = x12737
+	z12738 = x12738
+	z12739 = x12739
+	z12740 = x12740
+	z12741 = x12741
+	z12742 = x12742
+	z12743 = x12743
+	z12744 = x12744
+	z12745 = x12745
+	z12746 = x12746
+	z12747 = x12747
+	z12748 = x12748
+	z12749 = x12749
+	z12750 = x12750
+	z12751 = x12751
+	z12752 = x12752
+	z12753 = x12753
+	z12754 = x12754
+	z12755 = x12755
+	z12756 = x12756
+	z12757 = x12757
+	z12758 = x12758
+	z12759 = x12759
+	z12760 = x12760
+	z12761 = x12761
+	z12762 = x12762
+	z12763 = x12763
+	z12764 = x12764
+	z12765 = x12765
+	z12766 = x12766
+	z12767 = x12767
+	z12768 = x12768
+	z12769 = x12769
+	z12770 = x12770
+	z12771 = x12771
+	z12772 = x12772
+	z12773 = x12773
+	z12774 = x12774
+	z12775 = x12775
+	z12776 = x12776
+	z12777 = x12777
+	z12778 = x12778
+	z12779 = x12779
+	z12780 = x12780
+	z12781 = x12781
+	z12782 = x12782
+	z12783 = x12783
+	z12784 = x12784
+	z12785 = x12785
+	z12786 = x12786
+	z12787 = x12787
+	z12788 = x12788
+	z12789 = x12789
+	z12790 = x12790
+	z12791 = x12791
+	z12792 = x12792
+	z12793 = x12793
+	z12794 = x12794
+	z12795 = x12795
+	z12796 = x12796
+	z12797 = x12797
+	z12798 = x12798
+	z12799 = x12799
+	z12800 = x12800
+	z12801 = x12801
+	z12802 = x12802
+	z12803 = x12803
+	z12804 = x12804
+	z12805 = x12805
+	z12806 = x12806
+	z12807 = x12807
+	z12808 = x12808
+	z12809 = x12809
+	z12810 = x12810
+	z12811 = x12811
+	z12812 = x12812
+	z12813 = x12813
+	z12814 = x12814
+	z12815 = x12815
+	z12816 = x12816
+	z12817 = x12817
+	z12818 = x12818
+	z12819 = x12819
+	z12820 = x12820
+	z12821 = x12821
+	z12822 = x12822
+	z12823 = x12823
+	z12824 = x12824
+	z12825 = x12825
+	z12826 = x12826
+	z12827 = x12827
+	z12828 = x12828
+	z12829 = x12829
+	z12830 = x12830
+	z12831 = x12831
+	z12832 = x12832
+	z12833 = x12833
+	z12834 = x12834
+	z12835 = x12835
+	z12836 = x12836
+	z12837 = x12837
+	z12838 = x12838
+	z12839 = x12839
+	z12840 = x12840
+	z12841 = x12841
+	z12842 = x12842
+	z12843 = x12843
+	z12844 = x12844
+	z12845 = x12845
+	z12846 = x12846
+	z12847 = x12847
+	z12848 = x12848
+	z12849 = x12849
+	z12850 = x12850
+	z12851 = x12851
+	z12852 = x12852
+	z12853 = x12853
+	z12854 = x12854
+	z12855 = x12855
+	z12856 = x12856
+	z12857 = x12857
+	z12858 = x12858
+	z12859 = x12859
+	z12860 = x12860
+	z12861 = x12861
+	z12862 = x12862
+	z12863 = x12863
+	z12864 = x12864
+	z12865 = x12865
+	z12866 = x12866
+	z12867 = x12867
+	z12868 = x12868
+	z12869 = x12869
+	z12870 = x12870
+	z12871 = x12871
+	z12872 = x12872
+	z12873 = x12873
+	z12874 = x12874
+	z12875 = x12875
+	z12876 = x12876
+	z12877 = x12877
+	z12878 = x12878
+	z12879 = x12879
+	z12880 = x12880
+	z12881 = x12881
+	z12882 = x12882
+	z12883 = x12883
+	z12884 = x12884
+	z12885 = x12885
+	z12886 = x12886
+	z12887 = x12887
+	z12888 = x12888
+	z12889 = x12889
+	z12890 = x12890
+	z12891 = x12891
+	z12892 = x12892
+	z12893 = x12893
+	z12894 = x12894
+	z12895 = x12895
+	z12896 = x12896
+	z12897 = x12897
+	z12898 = x12898
+	z12899 = x12899
+	z12900 = x12900
+	z12901 = x12901
+	z12902 = x12902
+	z12903 = x12903
+	z12904 = x12904
+	z12905 = x12905
+	z12906 = x12906
+	z12907 = x12907
+	z12908 = x12908
+	z12909 = x12909
+	z12910 = x12910
+	z12911 = x12911
+	z12912 = x12912
+	z12913 = x12913
+	z12914 = x12914
+	z12915 = x12915
+	z12916 = x12916
+	z12917 = x12917
+	z12918 = x12918
+	z12919 = x12919
+	z12920 = x12920
+	z12921 = x12921
+	z12922 = x12922
+	z12923 = x12923
+	z12924 = x12924
+	z12925 = x12925
+	z12926 = x12926
+	z12927 = x12927
+	z12928 = x12928
+	z12929 = x12929
+	z12930 = x12930
+	z12931 = x12931
+	z12932 = x12932
+	z12933 = x12933
+	z12934 = x12934
+	z12935 = x12935
+	z12936 = x12936
+	z12937 = x12937
+	z12938 = x12938
+	z12939 = x12939
+	z12940 = x12940
+	z12941 = x12941
+	z12942 = x12942
+	z12943 = x12943
+	z12944 = x12944
+	z12945 = x12945
+	z12946 = x12946
+	z12947 = x12947
+	z12948 = x12948
+	z12949 = x12949
+	z12950 = x12950
+	z12951 = x12951
+	z12952 = x12952
+	z12953 = x12953
+	z12954 = x12954
+	z12955 = x12955
+	z12956 = x12956
+	z12957 = x12957
+	z12958 = x12958
+	z12959 = x12959
+	z12960 = x12960
+	z12961 = x12961
+	z12962 = x12962
+	z12963 = x12963
+	z12964 = x12964
+	z12965 = x12965
+	z12966 = x12966
+	z12967 = x12967
+	z12968 = x12968
+	z12969 = x12969
+	z12970 = x12970
+	z12971 = x12971
+	z12972 = x12972
+	z12973 = x12973
+	z12974 = x12974
+	z12975 = x12975
+	z12976 = x12976
+	z12977 = x12977
+	z12978 = x12978
+	z12979 = x12979
+	z12980 = x12980
+	z12981 = x12981
+	z12982 = x12982
+	z12983 = x12983
+	z12984 = x12984
+	z12985 = x12985
+	z12986 = x12986
+	z12987 = x12987
+	z12988 = x12988
+	z12989 = x12989
+	z12990 = x12990
+	z12991 = x12991
+	z12992 = x12992
+	z12993 = x12993
+	z12994 = x12994
+	z12995 = x12995
+	z12996 = x12996
+	z12997 = x12997
+	z12998 = x12998
+	z12999 = x12999
+	z13000 = x13000
+	z13001 = x13001
+	z13002 = x13002
+	z13003 = x13003
+	z13004 = x13004
+	z13005 = x13005
+	z13006 = x13006
+	z13007 = x13007
+	z13008 = x13008
+	z13009 = x13009
+	z13010 = x13010
+	z13011 = x13011
+	z13012 = x13012
+	z13013 = x13013
+	z13014 = x13014
+	z13015 = x13015
+	z13016 = x13016
+	z13017 = x13017
+	z13018 = x13018
+	z13019 = x13019
+	z13020 = x13020
+	z13021 = x13021
+	z13022 = x13022
+	z13023 = x13023
+	z13024 = x13024
+	z13025 = x13025
+	z13026 = x13026
+	z13027 = x13027
+	z13028 = x13028
+	z13029 = x13029
+	z13030 = x13030
+	z13031 = x13031
+	z13032 = x13032
+	z13033 = x13033
+	z13034 = x13034
+	z13035 = x13035
+	z13036 = x13036
+	z13037 = x13037
+	z13038 = x13038
+	z13039 = x13039
+	z13040 = x13040
+	z13041 = x13041
+	z13042 = x13042
+	z13043 = x13043
+	z13044 = x13044
+	z13045 = x13045
+	z13046 = x13046
+	z13047 = x13047
+	z13048 = x13048
+	z13049 = x13049
+	z13050 = x13050
+	z13051 = x13051
+	z13052 = x13052
+	z13053 = x13053
+	z13054 = x13054
+	z13055 = x13055
+	z13056 = x13056
+	z13057 = x13057
+	z13058 = x13058
+	z13059 = x13059
+	z13060 = x13060
+	z13061 = x13061
+	z13062 = x13062
+	z13063 = x13063
+	z13064 = x13064
+	z13065 = x13065
+	z13066 = x13066
+	z13067 = x13067
+	z13068 = x13068
+	z13069 = x13069
+	z13070 = x13070
+	z13071 = x13071
+	z13072 = x13072
+	z13073 = x13073
+	z13074 = x13074
+	z13075 = x13075
+	z13076 = x13076
+	z13077 = x13077
+	z13078 = x13078
+	z13079 = x13079
+	z13080 = x13080
+	z13081 = x13081
+	z13082 = x13082
+	z13083 = x13083
+	z13084 = x13084
+	z13085 = x13085
+	z13086 = x13086
+	z13087 = x13087
+	z13088 = x13088
+	z13089 = x13089
+	z13090 = x13090
+	z13091 = x13091
+	z13092 = x13092
+	z13093 = x13093
+	z13094 = x13094
+	z13095 = x13095
+	z13096 = x13096
+	z13097 = x13097
+	z13098 = x13098
+	z13099 = x13099
+	z13100 = x13100
+	z13101 = x13101
+	z13102 = x13102
+	z13103 = x13103
+	z13104 = x13104
+	z13105 = x13105
+	z13106 = x13106
+	z13107 = x13107
+	z13108 = x13108
+	z13109 = x13109
+	z13110 = x13110
+	z13111 = x13111
+	z13112 = x13112
+	z13113 = x13113
+	z13114 = x13114
+	z13115 = x13115
+	z13116 = x13116
+	z13117 = x13117
+	z13118 = x13118
+	z13119 = x13119
+	z13120 = x13120
+	z13121 = x13121
+	z13122 = x13122
+	z13123 = x13123
+	z13124 = x13124
+	z13125 = x13125
+	z13126 = x13126
+	z13127 = x13127
+	z13128 = x13128
+	z13129 = x13129
+	z13130 = x13130
+	z13131 = x13131
+	z13132 = x13132
+	z13133 = x13133
+	z13134 = x13134
+	z13135 = x13135
+	z13136 = x13136
+	z13137 = x13137
+	z13138 = x13138
+	z13139 = x13139
+	z13140 = x13140
+	z13141 = x13141
+	z13142 = x13142
+	z13143 = x13143
+	z13144 = x13144
+	z13145 = x13145
+	z13146 = x13146
+	z13147 = x13147
+	z13148 = x13148
+	z13149 = x13149
+	z13150 = x13150
+	z13151 = x13151
+	z13152 = x13152
+	z13153 = x13153
+	z13154 = x13154
+	z13155 = x13155
+	z13156 = x13156
+	z13157 = x13157
+	z13158 = x13158
+	z13159 = x13159
+	z13160 = x13160
+	z13161 = x13161
+	z13162 = x13162
+	z13163 = x13163
+	z13164 = x13164
+	z13165 = x13165
+	z13166 = x13166
+	z13167 = x13167
+	z13168 = x13168
+	z13169 = x13169
+	z13170 = x13170
+	z13171 = x13171
+	z13172 = x13172
+	z13173 = x13173
+	z13174 = x13174
+	z13175 = x13175
+	z13176 = x13176
+	z13177 = x13177
+	z13178 = x13178
+	z13179 = x13179
+	z13180 = x13180
+	z13181 = x13181
+	z13182 = x13182
+	z13183 = x13183
+	z13184 = x13184
+	z13185 = x13185
+	z13186 = x13186
+	z13187 = x13187
+	z13188 = x13188
+	z13189 = x13189
+	z13190 = x13190
+	z13191 = x13191
+	z13192 = x13192
+	z13193 = x13193
+	z13194 = x13194
+	z13195 = x13195
+	z13196 = x13196
+	z13197 = x13197
+	z13198 = x13198
+	z13199 = x13199
+	z13200 = x13200
+	z13201 = x13201
+	z13202 = x13202
+	z13203 = x13203
+	z13204 = x13204
+	z13205 = x13205
+	z13206 = x13206
+	z13207 = x13207
+	z13208 = x13208
+	z13209 = x13209
+	z13210 = x13210
+	z13211 = x13211
+	z13212 = x13212
+	z13213 = x13213
+	z13214 = x13214
+	z13215 = x13215
+	z13216 = x13216
+	z13217 = x13217
+	z13218 = x13218
+	z13219 = x13219
+	z13220 = x13220
+	z13221 = x13221
+	z13222 = x13222
+	z13223 = x13223
+	z13224 = x13224
+	z13225 = x13225
+	z13226 = x13226
+	z13227 = x13227
+	z13228 = x13228
+	z13229 = x13229
+	z13230 = x13230
+	z13231 = x13231
+	z13232 = x13232
+	z13233 = x13233
+	z13234 = x13234
+	z13235 = x13235
+	z13236 = x13236
+	z13237 = x13237
+	z13238 = x13238
+	z13239 = x13239
+	z13240 = x13240
+	z13241 = x13241
+	z13242 = x13242
+	z13243 = x13243
+	z13244 = x13244
+	z13245 = x13245
+	z13246 = x13246
+	z13247 = x13247
+	z13248 = x13248
+	z13249 = x13249
+	z13250 = x13250
+	z13251 = x13251
+	z13252 = x13252
+	z13253 = x13253
+	z13254 = x13254
+	z13255 = x13255
+	z13256 = x13256
+	z13257 = x13257
+	z13258 = x13258
+	z13259 = x13259
+	z13260 = x13260
+	z13261 = x13261
+	z13262 = x13262
+	z13263 = x13263
+	z13264 = x13264
+	z13265 = x13265
+	z13266 = x13266
+	z13267 = x13267
+	z13268 = x13268
+	z13269 = x13269
+	z13270 = x13270
+	z13271 = x13271
+	z13272 = x13272
+	z13273 = x13273
+	z13274 = x13274
+	z13275 = x13275
+	z13276 = x13276
+	z13277 = x13277
+	z13278 = x13278
+	z13279 = x13279
+	z13280 = x13280
+	z13281 = x13281
+	z13282 = x13282
+	z13283 = x13283
+	z13284 = x13284
+	z13285 = x13285
+	z13286 = x13286
+	z13287 = x13287
+	z13288 = x13288
+	z13289 = x13289
+	z13290 = x13290
+	z13291 = x13291
+	z13292 = x13292
+	z13293 = x13293
+	z13294 = x13294
+	z13295 = x13295
+	z13296 = x13296
+	z13297 = x13297
+	z13298 = x13298
+	z13299 = x13299
+	z13300 = x13300
+	z13301 = x13301
+	z13302 = x13302
+	z13303 = x13303
+	z13304 = x13304
+	z13305 = x13305
+	z13306 = x13306
+	z13307 = x13307
+	z13308 = x13308
+	z13309 = x13309
+	z13310 = x13310
+	z13311 = x13311
+	z13312 = x13312
+	z13313 = x13313
+	z13314 = x13314
+	z13315 = x13315
+	z13316 = x13316
+	z13317 = x13317
+	z13318 = x13318
+	z13319 = x13319
+	z13320 = x13320
+	z13321 = x13321
+	z13322 = x13322
+	z13323 = x13323
+	z13324 = x13324
+	z13325 = x13325
+	z13326 = x13326
+	z13327 = x13327
+	z13328 = x13328
+	z13329 = x13329
+	z13330 = x13330
+	z13331 = x13331
+	z13332 = x13332
+	z13333 = x13333
+	z13334 = x13334
+	z13335 = x13335
+	z13336 = x13336
+	z13337 = x13337
+	z13338 = x13338
+	z13339 = x13339
+	z13340 = x13340
+	z13341 = x13341
+	z13342 = x13342
+	z13343 = x13343
+	z13344 = x13344
+	z13345 = x13345
+	z13346 = x13346
+	z13347 = x13347
+	z13348 = x13348
+	z13349 = x13349
+	z13350 = x13350
+	z13351 = x13351
+	z13352 = x13352
+	z13353 = x13353
+	z13354 = x13354
+	z13355 = x13355
+	z13356 = x13356
+	z13357 = x13357
+	z13358 = x13358
+	z13359 = x13359
+	z13360 = x13360
+	z13361 = x13361
+	z13362 = x13362
+	z13363 = x13363
+	z13364 = x13364
+	z13365 = x13365
+	z13366 = x13366
+	z13367 = x13367
+	z13368 = x13368
+	z13369 = x13369
+	z13370 = x13370
+	z13371 = x13371
+	z13372 = x13372
+	z13373 = x13373
+	z13374 = x13374
+	z13375 = x13375
+	z13376 = x13376
+	z13377 = x13377
+	z13378 = x13378
+	z13379 = x13379
+	z13380 = x13380
+	z13381 = x13381
+	z13382 = x13382
+	z13383 = x13383
+	z13384 = x13384
+	z13385 = x13385
+	z13386 = x13386
+	z13387 = x13387
+	z13388 = x13388
+	z13389 = x13389
+	z13390 = x13390
+	z13391 = x13391
+	z13392 = x13392
+	z13393 = x13393
+	z13394 = x13394
+	z13395 = x13395
+	z13396 = x13396
+	z13397 = x13397
+	z13398 = x13398
+	z13399 = x13399
+	z13400 = x13400
+	z13401 = x13401
+	z13402 = x13402
+	z13403 = x13403
+	z13404 = x13404
+	z13405 = x13405
+	z13406 = x13406
+	z13407 = x13407
+	z13408 = x13408
+	z13409 = x13409
+	z13410 = x13410
+	z13411 = x13411
+	z13412 = x13412
+	z13413 = x13413
+	z13414 = x13414
+	z13415 = x13415
+	z13416 = x13416
+	z13417 = x13417
+	z13418 = x13418
+	z13419 = x13419
+	z13420 = x13420
+	z13421 = x13421
+	z13422 = x13422
+	z13423 = x13423
+	z13424 = x13424
+	z13425 = x13425
+	z13426 = x13426
+	z13427 = x13427
+	z13428 = x13428
+	z13429 = x13429
+	z13430 = x13430
+	z13431 = x13431
+	z13432 = x13432
+	z13433 = x13433
+	z13434 = x13434
+	z13435 = x13435
+	z13436 = x13436
+	z13437 = x13437
+	z13438 = x13438
+	z13439 = x13439
+	z13440 = x13440
+	z13441 = x13441
+	z13442 = x13442
+	z13443 = x13443
+	z13444 = x13444
+	z13445 = x13445
+	z13446 = x13446
+	z13447 = x13447
+	z13448 = x13448
+	z13449 = x13449
+	z13450 = x13450
+	z13451 = x13451
+	z13452 = x13452
+	z13453 = x13453
+	z13454 = x13454
+	z13455 = x13455
+	z13456 = x13456
+	z13457 = x13457
+	z13458 = x13458
+	z13459 = x13459
+	z13460 = x13460
+	z13461 = x13461
+	z13462 = x13462
+	z13463 = x13463
+	z13464 = x13464
+	z13465 = x13465
+	z13466 = x13466
+	z13467 = x13467
+	z13468 = x13468
+	z13469 = x13469
+	z13470 = x13470
+	z13471 = x13471
+	z13472 = x13472
+	z13473 = x13473
+	z13474 = x13474
+	z13475 = x13475
+	z13476 = x13476
+	z13477 = x13477
+	z13478 = x13478
+	z13479 = x13479
+	z13480 = x13480
+	z13481 = x13481
+	z13482 = x13482
+	z13483 = x13483
+	z13484 = x13484
+	z13485 = x13485
+	z13486 = x13486
+	z13487 = x13487
+	z13488 = x13488
+	z13489 = x13489
+	z13490 = x13490
+	z13491 = x13491
+	z13492 = x13492
+	z13493 = x13493
+	z13494 = x13494
+	z13495 = x13495
+	z13496 = x13496
+	z13497 = x13497
+	z13498 = x13498
+	z13499 = x13499
+	z13500 = x13500
+	z13501 = x13501
+	z13502 = x13502
+	z13503 = x13503
+	z13504 = x13504
+	z13505 = x13505
+	z13506 = x13506
+	z13507 = x13507
+	z13508 = x13508
+	z13509 = x13509
+	z13510 = x13510
+	z13511 = x13511
+	z13512 = x13512
+	z13513 = x13513
+	z13514 = x13514
+	z13515 = x13515
+	z13516 = x13516
+	z13517 = x13517
+	z13518 = x13518
+	z13519 = x13519
+	z13520 = x13520
+	z13521 = x13521
+	z13522 = x13522
+	z13523 = x13523
+	z13524 = x13524
+	z13525 = x13525
+	z13526 = x13526
+	z13527 = x13527
+	z13528 = x13528
+	z13529 = x13529
+	z13530 = x13530
+	z13531 = x13531
+	z13532 = x13532
+	z13533 = x13533
+	z13534 = x13534
+	z13535 = x13535
+	z13536 = x13536
+	z13537 = x13537
+	z13538 = x13538
+	z13539 = x13539
+	z13540 = x13540
+	z13541 = x13541
+	z13542 = x13542
+	z13543 = x13543
+	z13544 = x13544
+	z13545 = x13545
+	z13546 = x13546
+	z13547 = x13547
+	z13548 = x13548
+	z13549 = x13549
+	z13550 = x13550
+	z13551 = x13551
+	z13552 = x13552
+	z13553 = x13553
+	z13554 = x13554
+	z13555 = x13555
+	z13556 = x13556
+	z13557 = x13557
+	z13558 = x13558
+	z13559 = x13559
+	z13560 = x13560
+	z13561 = x13561
+	z13562 = x13562
+	z13563 = x13563
+	z13564 = x13564
+	z13565 = x13565
+	z13566 = x13566
+	z13567 = x13567
+	z13568 = x13568
+	z13569 = x13569
+	z13570 = x13570
+	z13571 = x13571
+	z13572 = x13572
+	z13573 = x13573
+	z13574 = x13574
+	z13575 = x13575
+	z13576 = x13576
+	z13577 = x13577
+	z13578 = x13578
+	z13579 = x13579
+	z13580 = x13580
+	z13581 = x13581
+	z13582 = x13582
+	z13583 = x13583
+	z13584 = x13584
+	z13585 = x13585
+	z13586 = x13586
+	z13587 = x13587
+	z13588 = x13588
+	z13589 = x13589
+	z13590 = x13590
+	z13591 = x13591
+	z13592 = x13592
+	z13593 = x13593
+	z13594 = x13594
+	z13595 = x13595
+	z13596 = x13596
+	z13597 = x13597
+	z13598 = x13598
+	z13599 = x13599
+	z13600 = x13600
+	z13601 = x13601
+	z13602 = x13602
+	z13603 = x13603
+	z13604 = x13604
+	z13605 = x13605
+	z13606 = x13606
+	z13607 = x13607
+	z13608 = x13608
+	z13609 = x13609
+	z13610 = x13610
+	z13611 = x13611
+	z13612 = x13612
+	z13613 = x13613
+	z13614 = x13614
+	z13615 = x13615
+	z13616 = x13616
+	z13617 = x13617
+	z13618 = x13618
+	z13619 = x13619
+	z13620 = x13620
+	z13621 = x13621
+	z13622 = x13622
+	z13623 = x13623
+	z13624 = x13624
+	z13625 = x13625
+	z13626 = x13626
+	z13627 = x13627
+	z13628 = x13628
+	z13629 = x13629
+	z13630 = x13630
+	z13631 = x13631
+	z13632 = x13632
+	z13633 = x13633
+	z13634 = x13634
+	z13635 = x13635
+	z13636 = x13636
+	z13637 = x13637
+	z13638 = x13638
+	z13639 = x13639
+	z13640 = x13640
+	z13641 = x13641
+	z13642 = x13642
+	z13643 = x13643
+	z13644 = x13644
+	z13645 = x13645
+	z13646 = x13646
+	z13647 = x13647
+	z13648 = x13648
+	z13649 = x13649
+	z13650 = x13650
+	z13651 = x13651
+	z13652 = x13652
+	z13653 = x13653
+	z13654 = x13654
+	z13655 = x13655
+	z13656 = x13656
+	z13657 = x13657
+	z13658 = x13658
+	z13659 = x13659
+	z13660 = x13660
+	z13661 = x13661
+	z13662 = x13662
+	z13663 = x13663
+	z13664 = x13664
+	z13665 = x13665
+	z13666 = x13666
+	z13667 = x13667
+	z13668 = x13668
+	z13669 = x13669
+	z13670 = x13670
+	z13671 = x13671
+	z13672 = x13672
+	z13673 = x13673
+	z13674 = x13674
+	z13675 = x13675
+	z13676 = x13676
+	z13677 = x13677
+	z13678 = x13678
+	z13679 = x13679
+	z13680 = x13680
+	z13681 = x13681
+	z13682 = x13682
+	z13683 = x13683
+	z13684 = x13684
+	z13685 = x13685
+	z13686 = x13686
+	z13687 = x13687
+	z13688 = x13688
+	z13689 = x13689
+	z13690 = x13690
+	z13691 = x13691
+	z13692 = x13692
+	z13693 = x13693
+	z13694 = x13694
+	z13695 = x13695
+	z13696 = x13696
+	z13697 = x13697
+	z13698 = x13698
+	z13699 = x13699
+	z13700 = x13700
+	z13701 = x13701
+	z13702 = x13702
+	z13703 = x13703
+	z13704 = x13704
+	z13705 = x13705
+	z13706 = x13706
+	z13707 = x13707
+	z13708 = x13708
+	z13709 = x13709
+	z13710 = x13710
+	z13711 = x13711
+	z13712 = x13712
+	z13713 = x13713
+	z13714 = x13714
+	z13715 = x13715
+	z13716 = x13716
+	z13717 = x13717
+	z13718 = x13718
+	z13719 = x13719
+	z13720 = x13720
+	z13721 = x13721
+	z13722 = x13722
+	z13723 = x13723
+	z13724 = x13724
+	z13725 = x13725
+	z13726 = x13726
+	z13727 = x13727
+	z13728 = x13728
+	z13729 = x13729
+	z13730 = x13730
+	z13731 = x13731
+	z13732 = x13732
+	z13733 = x13733
+	z13734 = x13734
+	z13735 = x13735
+	z13736 = x13736
+	z13737 = x13737
+	z13738 = x13738
+	z13739 = x13739
+	z13740 = x13740
+	z13741 = x13741
+	z13742 = x13742
+	z13743 = x13743
+	z13744 = x13744
+	z13745 = x13745
+	z13746 = x13746
+	z13747 = x13747
+	z13748 = x13748
+	z13749 = x13749
+	z13750 = x13750
+	z13751 = x13751
+	z13752 = x13752
+	z13753 = x13753
+	z13754 = x13754
+	z13755 = x13755
+	z13756 = x13756
+	z13757 = x13757
+	z13758 = x13758
+	z13759 = x13759
+	z13760 = x13760
+	z13761 = x13761
+	z13762 = x13762
+	z13763 = x13763
+	z13764 = x13764
+	z13765 = x13765
+	z13766 = x13766
+	z13767 = x13767
+	z13768 = x13768
+	z13769 = x13769
+	z13770 = x13770
+	z13771 = x13771
+	z13772 = x13772
+	z13773 = x13773
+	z13774 = x13774
+	z13775 = x13775
+	z13776 = x13776
+	z13777 = x13777
+	z13778 = x13778
+	z13779 = x13779
+	z13780 = x13780
+	z13781 = x13781
+	z13782 = x13782
+	z13783 = x13783
+	z13784 = x13784
+	z13785 = x13785
+	z13786 = x13786
+	z13787 = x13787
+	z13788 = x13788
+	z13789 = x13789
+	z13790 = x13790
+	z13791 = x13791
+	z13792 = x13792
+	z13793 = x13793
+	z13794 = x13794
+	z13795 = x13795
+	z13796 = x13796
+	z13797 = x13797
+	z13798 = x13798
+	z13799 = x13799
+	z13800 = x13800
+	z13801 = x13801
+	z13802 = x13802
+	z13803 = x13803
+	z13804 = x13804
+	z13805 = x13805
+	z13806 = x13806
+	z13807 = x13807
+	z13808 = x13808
+	z13809 = x13809
+	z13810 = x13810
+	z13811 = x13811
+	z13812 = x13812
+	z13813 = x13813
+	z13814 = x13814
+	z13815 = x13815
+	z13816 = x13816
+	z13817 = x13817
+	z13818 = x13818
+	z13819 = x13819
+	z13820 = x13820
+	z13821 = x13821
+	z13822 = x13822
+	z13823 = x13823
+	z13824 = x13824
+	z13825 = x13825
+	z13826 = x13826
+	z13827 = x13827
+	z13828 = x13828
+	z13829 = x13829
+	z13830 = x13830
+	z13831 = x13831
+	z13832 = x13832
+	z13833 = x13833
+	z13834 = x13834
+	z13835 = x13835
+	z13836 = x13836
+	z13837 = x13837
+	z13838 = x13838
+	z13839 = x13839
+	z13840 = x13840
+	z13841 = x13841
+	z13842 = x13842
+	z13843 = x13843
+	z13844 = x13844
+	z13845 = x13845
+	z13846 = x13846
+	z13847 = x13847
+	z13848 = x13848
+	z13849 = x13849
+	z13850 = x13850
+	z13851 = x13851
+	z13852 = x13852
+	z13853 = x13853
+	z13854 = x13854
+	z13855 = x13855
+	z13856 = x13856
+	z13857 = x13857
+	z13858 = x13858
+	z13859 = x13859
+	z13860 = x13860
+	z13861 = x13861
+	z13862 = x13862
+	z13863 = x13863
+	z13864 = x13864
+	z13865 = x13865
+	z13866 = x13866
+	z13867 = x13867
+	z13868 = x13868
+	z13869 = x13869
+	z13870 = x13870
+	z13871 = x13871
+	z13872 = x13872
+	z13873 = x13873
+	z13874 = x13874
+	z13875 = x13875
+	z13876 = x13876
+	z13877 = x13877
+	z13878 = x13878
+	z13879 = x13879
+	z13880 = x13880
+	z13881 = x13881
+	z13882 = x13882
+	z13883 = x13883
+	z13884 = x13884
+	z13885 = x13885
+	z13886 = x13886
+	z13887 = x13887
+	z13888 = x13888
+	z13889 = x13889
+	z13890 = x13890
+	z13891 = x13891
+	z13892 = x13892
+	z13893 = x13893
+	z13894 = x13894
+	z13895 = x13895
+	z13896 = x13896
+	z13897 = x13897
+	z13898 = x13898
+	z13899 = x13899
+	z13900 = x13900
+	z13901 = x13901
+	z13902 = x13902
+	z13903 = x13903
+	z13904 = x13904
+	z13905 = x13905
+	z13906 = x13906
+	z13907 = x13907
+	z13908 = x13908
+	z13909 = x13909
+	z13910 = x13910
+	z13911 = x13911
+	z13912 = x13912
+	z13913 = x13913
+	z13914 = x13914
+	z13915 = x13915
+	z13916 = x13916
+	z13917 = x13917
+	z13918 = x13918
+	z13919 = x13919
+	z13920 = x13920
+	z13921 = x13921
+	z13922 = x13922
+	z13923 = x13923
+	z13924 = x13924
+	z13925 = x13925
+	z13926 = x13926
+	z13927 = x13927
+	z13928 = x13928
+	z13929 = x13929
+	z13930 = x13930
+	z13931 = x13931
+	z13932 = x13932
+	z13933 = x13933
+	z13934 = x13934
+	z13935 = x13935
+	z13936 = x13936
+	z13937 = x13937
+	z13938 = x13938
+	z13939 = x13939
+	z13940 = x13940
+	z13941 = x13941
+	z13942 = x13942
+	z13943 = x13943
+	z13944 = x13944
+	z13945 = x13945
+	z13946 = x13946
+	z13947 = x13947
+	z13948 = x13948
+	z13949 = x13949
+	z13950 = x13950
+	z13951 = x13951
+	z13952 = x13952
+	z13953 = x13953
+	z13954 = x13954
+	z13955 = x13955
+	z13956 = x13956
+	z13957 = x13957
+	z13958 = x13958
+	z13959 = x13959
+	z13960 = x13960
+	z13961 = x13961
+	z13962 = x13962
+	z13963 = x13963
+	z13964 = x13964
+	z13965 = x13965
+	z13966 = x13966
+	z13967 = x13967
+	z13968 = x13968
+	z13969 = x13969
+	z13970 = x13970
+	z13971 = x13971
+	z13972 = x13972
+	z13973 = x13973
+	z13974 = x13974
+	z13975 = x13975
+	z13976 = x13976
+	z13977 = x13977
+	z13978 = x13978
+	z13979 = x13979
+	z13980 = x13980
+	z13981 = x13981
+	z13982 = x13982
+	z13983 = x13983
+	z13984 = x13984
+	z13985 = x13985
+	z13986 = x13986
+	z13987 = x13987
+	z13988 = x13988
+	z13989 = x13989
+	z13990 = x13990
+	z13991 = x13991
+	z13992 = x13992
+	z13993 = x13993
+	z13994 = x13994
+	z13995 = x13995
+	z13996 = x13996
+	z13997 = x13997
+	z13998 = x13998
+	z13999 = x13999
+	z14000 = x14000
+	z14001 = x14001
+	z14002 = x14002
+	z14003 = x14003
+	z14004 = x14004
+	z14005 = x14005
+	z14006 = x14006
+	z14007 = x14007
+	z14008 = x14008
+	z14009 = x14009
+	z14010 = x14010
+	z14011 = x14011
+	z14012 = x14012
+	z14013 = x14013
+	z14014 = x14014
+	z14015 = x14015
+	z14016 = x14016
+	z14017 = x14017
+	z14018 = x14018
+	z14019 = x14019
+	z14020 = x14020
+	z14021 = x14021
+	z14022 = x14022
+	z14023 = x14023
+	z14024 = x14024
+	z14025 = x14025
+	z14026 = x14026
+	z14027 = x14027
+	z14028 = x14028
+	z14029 = x14029
+	z14030 = x14030
+	z14031 = x14031
+	z14032 = x14032
+	z14033 = x14033
+	z14034 = x14034
+	z14035 = x14035
+	z14036 = x14036
+	z14037 = x14037
+	z14038 = x14038
+	z14039 = x14039
+	z14040 = x14040
+	z14041 = x14041
+	z14042 = x14042
+	z14043 = x14043
+	z14044 = x14044
+	z14045 = x14045
+	z14046 = x14046
+	z14047 = x14047
+	z14048 = x14048
+	z14049 = x14049
+	z14050 = x14050
+	z14051 = x14051
+	z14052 = x14052
+	z14053 = x14053
+	z14054 = x14054
+	z14055 = x14055
+	z14056 = x14056
+	z14057 = x14057
+	z14058 = x14058
+	z14059 = x14059
+	z14060 = x14060
+	z14061 = x14061
+	z14062 = x14062
+	z14063 = x14063
+	z14064 = x14064
+	z14065 = x14065
+	z14066 = x14066
+	z14067 = x14067
+	z14068 = x14068
+	z14069 = x14069
+	z14070 = x14070
+	z14071 = x14071
+	z14072 = x14072
+	z14073 = x14073
+	z14074 = x14074
+	z14075 = x14075
+	z14076 = x14076
+	z14077 = x14077
+	z14078 = x14078
+	z14079 = x14079
+	z14080 = x14080
+	z14081 = x14081
+	z14082 = x14082
+	z14083 = x14083
+	z14084 = x14084
+	z14085 = x14085
+	z14086 = x14086
+	z14087 = x14087
+	z14088 = x14088
+	z14089 = x14089
+	z14090 = x14090
+	z14091 = x14091
+	z14092 = x14092
+	z14093 = x14093
+	z14094 = x14094
+	z14095 = x14095
+	z14096 = x14096
+	z14097 = x14097
+	z14098 = x14098
+	z14099 = x14099
+	z14100 = x14100
+	z14101 = x14101
+	z14102 = x14102
+	z14103 = x14103
+	z14104 = x14104
+	z14105 = x14105
+	z14106 = x14106
+	z14107 = x14107
+	z14108 = x14108
+	z14109 = x14109
+	z14110 = x14110
+	z14111 = x14111
+	z14112 = x14112
+	z14113 = x14113
+	z14114 = x14114
+	z14115 = x14115
+	z14116 = x14116
+	z14117 = x14117
+	z14118 = x14118
+	z14119 = x14119
+	z14120 = x14120
+	z14121 = x14121
+	z14122 = x14122
+	z14123 = x14123
+	z14124 = x14124
+	z14125 = x14125
+	z14126 = x14126
+	z14127 = x14127
+	z14128 = x14128
+	z14129 = x14129
+	z14130 = x14130
+	z14131 = x14131
+	z14132 = x14132
+	z14133 = x14133
+	z14134 = x14134
+	z14135 = x14135
+	z14136 = x14136
+	z14137 = x14137
+	z14138 = x14138
+	z14139 = x14139
+	z14140 = x14140
+	z14141 = x14141
+	z14142 = x14142
+	z14143 = x14143
+	z14144 = x14144
+	z14145 = x14145
+	z14146 = x14146
+	z14147 = x14147
+	z14148 = x14148
+	z14149 = x14149
+	z14150 = x14150
+	z14151 = x14151
+	z14152 = x14152
+	z14153 = x14153
+	z14154 = x14154
+	z14155 = x14155
+	z14156 = x14156
+	z14157 = x14157
+	z14158 = x14158
+	z14159 = x14159
+	z14160 = x14160
+	z14161 = x14161
+	z14162 = x14162
+	z14163 = x14163
+	z14164 = x14164
+	z14165 = x14165
+	z14166 = x14166
+	z14167 = x14167
+	z14168 = x14168
+	z14169 = x14169
+	z14170 = x14170
+	z14171 = x14171
+	z14172 = x14172
+	z14173 = x14173
+	z14174 = x14174
+	z14175 = x14175
+	z14176 = x14176
+	z14177 = x14177
+	z14178 = x14178
+	z14179 = x14179
+	z14180 = x14180
+	z14181 = x14181
+	z14182 = x14182
+	z14183 = x14183
+	z14184 = x14184
+	z14185 = x14185
+	z14186 = x14186
+	z14187 = x14187
+	z14188 = x14188
+	z14189 = x14189
+	z14190 = x14190
+	z14191 = x14191
+	z14192 = x14192
+	z14193 = x14193
+	z14194 = x14194
+	z14195 = x14195
+	z14196 = x14196
+	z14197 = x14197
+	z14198 = x14198
+	z14199 = x14199
+	z14200 = x14200
+	z14201 = x14201
+	z14202 = x14202
+	z14203 = x14203
+	z14204 = x14204
+	z14205 = x14205
+	z14206 = x14206
+	z14207 = x14207
+	z14208 = x14208
+	z14209 = x14209
+	z14210 = x14210
+	z14211 = x14211
+	z14212 = x14212
+	z14213 = x14213
+	z14214 = x14214
+	z14215 = x14215
+	z14216 = x14216
+	z14217 = x14217
+	z14218 = x14218
+	z14219 = x14219
+	z14220 = x14220
+	z14221 = x14221
+	z14222 = x14222
+	z14223 = x14223
+	z14224 = x14224
+	z14225 = x14225
+	z14226 = x14226
+	z14227 = x14227
+	z14228 = x14228
+	z14229 = x14229
+	z14230 = x14230
+	z14231 = x14231
+	z14232 = x14232
+	z14233 = x14233
+	z14234 = x14234
+	z14235 = x14235
+	z14236 = x14236
+	z14237 = x14237
+	z14238 = x14238
+	z14239 = x14239
+	z14240 = x14240
+	z14241 = x14241
+	z14242 = x14242
+	z14243 = x14243
+	z14244 = x14244
+	z14245 = x14245
+	z14246 = x14246
+	z14247 = x14247
+	z14248 = x14248
+	z14249 = x14249
+	z14250 = x14250
+	z14251 = x14251
+	z14252 = x14252
+	z14253 = x14253
+	z14254 = x14254
+	z14255 = x14255
+	z14256 = x14256
+	z14257 = x14257
+	z14258 = x14258
+	z14259 = x14259
+	z14260 = x14260
+	z14261 = x14261
+	z14262 = x14262
+	z14263 = x14263
+	z14264 = x14264
+	z14265 = x14265
+	z14266 = x14266
+	z14267 = x14267
+	z14268 = x14268
+	z14269 = x14269
+	z14270 = x14270
+	z14271 = x14271
+	z14272 = x14272
+	z14273 = x14273
+	z14274 = x14274
+	z14275 = x14275
+	z14276 = x14276
+	z14277 = x14277
+	z14278 = x14278
+	z14279 = x14279
+	z14280 = x14280
+	z14281 = x14281
+	z14282 = x14282
+	z14283 = x14283
+	z14284 = x14284
+	z14285 = x14285
+	z14286 = x14286
+	z14287 = x14287
+	z14288 = x14288
+	z14289 = x14289
+	z14290 = x14290
+	z14291 = x14291
+	z14292 = x14292
+	z14293 = x14293
+	z14294 = x14294
+	z14295 = x14295
+	z14296 = x14296
+	z14297 = x14297
+	z14298 = x14298
+	z14299 = x14299
+	z14300 = x14300
+	z14301 = x14301
+	z14302 = x14302
+	z14303 = x14303
+	z14304 = x14304
+	z14305 = x14305
+	z14306 = x14306
+	z14307 = x14307
+	z14308 = x14308
+	z14309 = x14309
+	z14310 = x14310
+	z14311 = x14311
+	z14312 = x14312
+	z14313 = x14313
+	z14314 = x14314
+	z14315 = x14315
+	z14316 = x14316
+	z14317 = x14317
+	z14318 = x14318
+	z14319 = x14319
+	z14320 = x14320
+	z14321 = x14321
+	z14322 = x14322
+	z14323 = x14323
+	z14324 = x14324
+	z14325 = x14325
+	z14326 = x14326
+	z14327 = x14327
+	z14328 = x14328
+	z14329 = x14329
+	z14330 = x14330
+	z14331 = x14331
+	z14332 = x14332
+	z14333 = x14333
+	z14334 = x14334
+	z14335 = x14335
+	z14336 = x14336
+	z14337 = x14337
+	z14338 = x14338
+	z14339 = x14339
+	z14340 = x14340
+	z14341 = x14341
+	z14342 = x14342
+	z14343 = x14343
+	z14344 = x14344
+	z14345 = x14345
+	z14346 = x14346
+	z14347 = x14347
+	z14348 = x14348
+	z14349 = x14349
+	z14350 = x14350
+	z14351 = x14351
+	z14352 = x14352
+	z14353 = x14353
+	z14354 = x14354
+	z14355 = x14355
+	z14356 = x14356
+	z14357 = x14357
+	z14358 = x14358
+	z14359 = x14359
+	z14360 = x14360
+	z14361 = x14361
+	z14362 = x14362
+	z14363 = x14363
+	z14364 = x14364
+	z14365 = x14365
+	z14366 = x14366
+	z14367 = x14367
+	z14368 = x14368
+	z14369 = x14369
+	z14370 = x14370
+	z14371 = x14371
+	z14372 = x14372
+	z14373 = x14373
+	z14374 = x14374
+	z14375 = x14375
+	z14376 = x14376
+	z14377 = x14377
+	z14378 = x14378
+	z14379 = x14379
+	z14380 = x14380
+	z14381 = x14381
+	z14382 = x14382
+	z14383 = x14383
+	z14384 = x14384
+	z14385 = x14385
+	z14386 = x14386
+	z14387 = x14387
+	z14388 = x14388
+	z14389 = x14389
+	z14390 = x14390
+	z14391 = x14391
+	z14392 = x14392
+	z14393 = x14393
+	z14394 = x14394
+	z14395 = x14395
+	z14396 = x14396
+	z14397 = x14397
+	z14398 = x14398
+	z14399 = x14399
+	z14400 = x14400
+	z14401 = x14401
+	z14402 = x14402
+	z14403 = x14403
+	z14404 = x14404
+	z14405 = x14405
+	z14406 = x14406
+	z14407 = x14407
+	z14408 = x14408
+	z14409 = x14409
+	z14410 = x14410
+	z14411 = x14411
+	z14412 = x14412
+	z14413 = x14413
+	z14414 = x14414
+	z14415 = x14415
+	z14416 = x14416
+	z14417 = x14417
+	z14418 = x14418
+	z14419 = x14419
+	z14420 = x14420
+	z14421 = x14421
+	z14422 = x14422
+	z14423 = x14423
+	z14424 = x14424
+	z14425 = x14425
+	z14426 = x14426
+	z14427 = x14427
+	z14428 = x14428
+	z14429 = x14429
+	z14430 = x14430
+	z14431 = x14431
+	z14432 = x14432
+	z14433 = x14433
+	z14434 = x14434
+	z14435 = x14435
+	z14436 = x14436
+	z14437 = x14437
+	z14438 = x14438
+	z14439 = x14439
+	z14440 = x14440
+	z14441 = x14441
+	z14442 = x14442
+	z14443 = x14443
+	z14444 = x14444
+	z14445 = x14445
+	z14446 = x14446
+	z14447 = x14447
+	z14448 = x14448
+	z14449 = x14449
+	z14450 = x14450
+	z14451 = x14451
+	z14452 = x14452
+	z14453 = x14453
+	z14454 = x14454
+	z14455 = x14455
+	z14456 = x14456
+	z14457 = x14457
+	z14458 = x14458
+	z14459 = x14459
+	z14460 = x14460
+	z14461 = x14461
+	z14462 = x14462
+	z14463 = x14463
+	z14464 = x14464
+	z14465 = x14465
+	z14466 = x14466
+	z14467 = x14467
+	z14468 = x14468
+	z14469 = x14469
+	z14470 = x14470
+	z14471 = x14471
+	z14472 = x14472
+	z14473 = x14473
+	z14474 = x14474
+	z14475 = x14475
+	z14476 = x14476
+	z14477 = x14477
+	z14478 = x14478
+	z14479 = x14479
+	z14480 = x14480
+	z14481 = x14481
+	z14482 = x14482
+	z14483 = x14483
+	z14484 = x14484
+	z14485 = x14485
+	z14486 = x14486
+	z14487 = x14487
+	z14488 = x14488
+	z14489 = x14489
+	z14490 = x14490
+	z14491 = x14491
+	z14492 = x14492
+	z14493 = x14493
+	z14494 = x14494
+	z14495 = x14495
+	z14496 = x14496
+	z14497 = x14497
+	z14498 = x14498
+	z14499 = x14499
+	z14500 = x14500
+	z14501 = x14501
+	z14502 = x14502
+	z14503 = x14503
+	z14504 = x14504
+	z14505 = x14505
+	z14506 = x14506
+	z14507 = x14507
+	z14508 = x14508
+	z14509 = x14509
+	z14510 = x14510
+	z14511 = x14511
+	z14512 = x14512
+	z14513 = x14513
+	z14514 = x14514
+	z14515 = x14515
+	z14516 = x14516
+	z14517 = x14517
+	z14518 = x14518
+	z14519 = x14519
+	z14520 = x14520
+	z14521 = x14521
+	z14522 = x14522
+	z14523 = x14523
+	z14524 = x14524
+	z14525 = x14525
+	z14526 = x14526
+	z14527 = x14527
+	z14528 = x14528
+	z14529 = x14529
+	z14530 = x14530
+	z14531 = x14531
+	z14532 = x14532
+	z14533 = x14533
+	z14534 = x14534
+	z14535 = x14535
+	z14536 = x14536
+	z14537 = x14537
+	z14538 = x14538
+	z14539 = x14539
+	z14540 = x14540
+	z14541 = x14541
+	z14542 = x14542
+	z14543 = x14543
+	z14544 = x14544
+	z14545 = x14545
+	z14546 = x14546
+	z14547 = x14547
+	z14548 = x14548
+	z14549 = x14549
+	z14550 = x14550
+	z14551 = x14551
+	z14552 = x14552
+	z14553 = x14553
+	z14554 = x14554
+	z14555 = x14555
+	z14556 = x14556
+	z14557 = x14557
+	z14558 = x14558
+	z14559 = x14559
+	z14560 = x14560
+	z14561 = x14561
+	z14562 = x14562
+	z14563 = x14563
+	z14564 = x14564
+	z14565 = x14565
+	z14566 = x14566
+	z14567 = x14567
+	z14568 = x14568
+	z14569 = x14569
+	z14570 = x14570
+	z14571 = x14571
+	z14572 = x14572
+	z14573 = x14573
+	z14574 = x14574
+	z14575 = x14575
+	z14576 = x14576
+	z14577 = x14577
+	z14578 = x14578
+	z14579 = x14579
+	z14580 = x14580
+	z14581 = x14581
+	z14582 = x14582
+	z14583 = x14583
+	z14584 = x14584
+	z14585 = x14585
+	z14586 = x14586
+	z14587 = x14587
+	z14588 = x14588
+	z14589 = x14589
+	z14590 = x14590
+	z14591 = x14591
+	z14592 = x14592
+	z14593 = x14593
+	z14594 = x14594
+	z14595 = x14595
+	z14596 = x14596
+	z14597 = x14597
+	z14598 = x14598
+	z14599 = x14599
+	z14600 = x14600
+	z14601 = x14601
+	z14602 = x14602
+	z14603 = x14603
+	z14604 = x14604
+	z14605 = x14605
+	z14606 = x14606
+	z14607 = x14607
+	z14608 = x14608
+	z14609 = x14609
+	z14610 = x14610
+	z14611 = x14611
+	z14612 = x14612
+	z14613 = x14613
+	z14614 = x14614
+	z14615 = x14615
+	z14616 = x14616
+	z14617 = x14617
+	z14618 = x14618
+	z14619 = x14619
+	z14620 = x14620
+	z14621 = x14621
+	z14622 = x14622
+	z14623 = x14623
+	z14624 = x14624
+	z14625 = x14625
+	z14626 = x14626
+	z14627 = x14627
+	z14628 = x14628
+	z14629 = x14629
+	z14630 = x14630
+	z14631 = x14631
+	z14632 = x14632
+	z14633 = x14633
+	z14634 = x14634
+	z14635 = x14635
+	z14636 = x14636
+	z14637 = x14637
+	z14638 = x14638
+	z14639 = x14639
+	z14640 = x14640
+	z14641 = x14641
+	z14642 = x14642
+	z14643 = x14643
+	z14644 = x14644
+	z14645 = x14645
+	z14646 = x14646
+	z14647 = x14647
+	z14648 = x14648
+	z14649 = x14649
+	z14650 = x14650
+	z14651 = x14651
+	z14652 = x14652
+	z14653 = x14653
+	z14654 = x14654
+	z14655 = x14655
+	z14656 = x14656
+	z14657 = x14657
+	z14658 = x14658
+	z14659 = x14659
+	z14660 = x14660
+	z14661 = x14661
+	z14662 = x14662
+	z14663 = x14663
+	z14664 = x14664
+	z14665 = x14665
+	z14666 = x14666
+	z14667 = x14667
+	z14668 = x14668
+	z14669 = x14669
+	z14670 = x14670
+	z14671 = x14671
+	z14672 = x14672
+	z14673 = x14673
+	z14674 = x14674
+	z14675 = x14675
+	z14676 = x14676
+	z14677 = x14677
+	z14678 = x14678
+	z14679 = x14679
+	z14680 = x14680
+	z14681 = x14681
+	z14682 = x14682
+	z14683 = x14683
+	z14684 = x14684
+	z14685 = x14685
+	z14686 = x14686
+	z14687 = x14687
+	z14688 = x14688
+	z14689 = x14689
+	z14690 = x14690
+	z14691 = x14691
+	z14692 = x14692
+	z14693 = x14693
+	z14694 = x14694
+	z14695 = x14695
+	z14696 = x14696
+	z14697 = x14697
+	z14698 = x14698
+	z14699 = x14699
+	z14700 = x14700
+	z14701 = x14701
+	z14702 = x14702
+	z14703 = x14703
+	z14704 = x14704
+	z14705 = x14705
+	z14706 = x14706
+	z14707 = x14707
+	z14708 = x14708
+	z14709 = x14709
+	z14710 = x14710
+	z14711 = x14711
+	z14712 = x14712
+	z14713 = x14713
+	z14714 = x14714
+	z14715 = x14715
+	z14716 = x14716
+	z14717 = x14717
+	z14718 = x14718
+	z14719 = x14719
+	z14720 = x14720
+	z14721 = x14721
+	z14722 = x14722
+	z14723 = x14723
+	z14724 = x14724
+	z14725 = x14725
+	z14726 = x14726
+	z14727 = x14727
+	z14728 = x14728
+	z14729 = x14729
+	z14730 = x14730
+	z14731 = x14731
+	z14732 = x14732
+	z14733 = x14733
+	z14734 = x14734
+	z14735 = x14735
+	z14736 = x14736
+	z14737 = x14737
+	z14738 = x14738
+	z14739 = x14739
+	z14740 = x14740
+	z14741 = x14741
+	z14742 = x14742
+	z14743 = x14743
+	z14744 = x14744
+	z14745 = x14745
+	z14746 = x14746
+	z14747 = x14747
+	z14748 = x14748
+	z14749 = x14749
+	z14750 = x14750
+	z14751 = x14751
+	z14752 = x14752
+	z14753 = x14753
+	z14754 = x14754
+	z14755 = x14755
+	z14756 = x14756
+	z14757 = x14757
+	z14758 = x14758
+	z14759 = x14759
+	z14760 = x14760
+	z14761 = x14761
+	z14762 = x14762
+	z14763 = x14763
+	z14764 = x14764
+	z14765 = x14765
+	z14766 = x14766
+	z14767 = x14767
+	z14768 = x14768
+	z14769 = x14769
+	z14770 = x14770
+	z14771 = x14771
+	z14772 = x14772
+	z14773 = x14773
+	z14774 = x14774
+	z14775 = x14775
+	z14776 = x14776
+	z14777 = x14777
+	z14778 = x14778
+	z14779 = x14779
+	z14780 = x14780
+	z14781 = x14781
+	z14782 = x14782
+	z14783 = x14783
+	z14784 = x14784
+	z14785 = x14785
+	z14786 = x14786
+	z14787 = x14787
+	z14788 = x14788
+	z14789 = x14789
+	z14790 = x14790
+	z14791 = x14791
+	z14792 = x14792
+	z14793 = x14793
+	z14794 = x14794
+	z14795 = x14795
+	z14796 = x14796
+	z14797 = x14797
+	z14798 = x14798
+	z14799 = x14799
+	z14800 = x14800
+	z14801 = x14801
+	z14802 = x14802
+	z14803 = x14803
+	z14804 = x14804
+	z14805 = x14805
+	z14806 = x14806
+	z14807 = x14807
+	z14808 = x14808
+	z14809 = x14809
+	z14810 = x14810
+	z14811 = x14811
+	z14812 = x14812
+	z14813 = x14813
+	z14814 = x14814
+	z14815 = x14815
+	z14816 = x14816
+	z14817 = x14817
+	z14818 = x14818
+	z14819 = x14819
+	z14820 = x14820
+	z14821 = x14821
+	z14822 = x14822
+	z14823 = x14823
+	z14824 = x14824
+	z14825 = x14825
+	z14826 = x14826
+	z14827 = x14827
+	z14828 = x14828
+	z14829 = x14829
+	z14830 = x14830
+	z14831 = x14831
+	z14832 = x14832
+	z14833 = x14833
+	z14834 = x14834
+	z14835 = x14835
+	z14836 = x14836
+	z14837 = x14837
+	z14838 = x14838
+	z14839 = x14839
+	z14840 = x14840
+	z14841 = x14841
+	z14842 = x14842
+	z14843 = x14843
+	z14844 = x14844
+	z14845 = x14845
+	z14846 = x14846
+	z14847 = x14847
+	z14848 = x14848
+	z14849 = x14849
+	z14850 = x14850
+	z14851 = x14851
+	z14852 = x14852
+	z14853 = x14853
+	z14854 = x14854
+	z14855 = x14855
+	z14856 = x14856
+	z14857 = x14857
+	z14858 = x14858
+	z14859 = x14859
+	z14860 = x14860
+	z14861 = x14861
+	z14862 = x14862
+	z14863 = x14863
+	z14864 = x14864
+	z14865 = x14865
+	z14866 = x14866
+	z14867 = x14867
+	z14868 = x14868
+	z14869 = x14869
+	z14870 = x14870
+	z14871 = x14871
+	z14872 = x14872
+	z14873 = x14873
+	z14874 = x14874
+	z14875 = x14875
+	z14876 = x14876
+	z14877 = x14877
+	z14878 = x14878
+	z14879 = x14879
+	z14880 = x14880
+	z14881 = x14881
+	z14882 = x14882
+	z14883 = x14883
+	z14884 = x14884
+	z14885 = x14885
+	z14886 = x14886
+	z14887 = x14887
+	z14888 = x14888
+	z14889 = x14889
+	z14890 = x14890
+	z14891 = x14891
+	z14892 = x14892
+	z14893 = x14893
+	z14894 = x14894
+	z14895 = x14895
+	z14896 = x14896
+	z14897 = x14897
+	z14898 = x14898
+	z14899 = x14899
+	z14900 = x14900
+	z14901 = x14901
+	z14902 = x14902
+	z14903 = x14903
+	z14904 = x14904
+	z14905 = x14905
+	z14906 = x14906
+	z14907 = x14907
+	z14908 = x14908
+	z14909 = x14909
+	z14910 = x14910
+	z14911 = x14911
+	z14912 = x14912
+	z14913 = x14913
+	z14914 = x14914
+	z14915 = x14915
+	z14916 = x14916
+	z14917 = x14917
+	z14918 = x14918
+	z14919 = x14919
+	z14920 = x14920
+	z14921 = x14921
+	z14922 = x14922
+	z14923 = x14923
+	z14924 = x14924
+	z14925 = x14925
+	z14926 = x14926
+	z14927 = x14927
+	z14928 = x14928
+	z14929 = x14929
+	z14930 = x14930
+	z14931 = x14931
+	z14932 = x14932
+	z14933 = x14933
+	z14934 = x14934
+	z14935 = x14935
+	z14936 = x14936
+	z14937 = x14937
+	z14938 = x14938
+	z14939 = x14939
+	z14940 = x14940
+	z14941 = x14941
+	z14942 = x14942
+	z14943 = x14943
+	z14944 = x14944
+	z14945 = x14945
+	z14946 = x14946
+	z14947 = x14947
+	z14948 = x14948
+	z14949 = x14949
+	z14950 = x14950
+	z14951 = x14951
+	z14952 = x14952
+	z14953 = x14953
+	z14954 = x14954
+	z14955 = x14955
+	z14956 = x14956
+	z14957 = x14957
+	z14958 = x14958
+	z14959 = x14959
+	z14960 = x14960
+	z14961 = x14961
+	z14962 = x14962
+	z14963 = x14963
+	z14964 = x14964
+	z14965 = x14965
+	z14966 = x14966
+	z14967 = x14967
+	z14968 = x14968
+	z14969 = x14969
+	z14970 = x14970
+	z14971 = x14971
+	z14972 = x14972
+	z14973 = x14973
+	z14974 = x14974
+	z14975 = x14975
+	z14976 = x14976
+	z14977 = x14977
+	z14978 = x14978
+	z14979 = x14979
+	z14980 = x14980
+	z14981 = x14981
+	z14982 = x14982
+	z14983 = x14983
+	z14984 = x14984
+	z14985 = x14985
+	z14986 = x14986
+	z14987 = x14987
+	z14988 = x14988
+	z14989 = x14989
+	z14990 = x14990
+	z14991 = x14991
+	z14992 = x14992
+	z14993 = x14993
+	z14994 = x14994
+	z14995 = x14995
+	z14996 = x14996
+	z14997 = x14997
+	z14998 = x14998
+	z14999 = x14999
+	z15000 = x15000
+	z15001 = x15001
+	z15002 = x15002
+	z15003 = x15003
+	z15004 = x15004
+	z15005 = x15005
+	z15006 = x15006
+	z15007 = x15007
+	z15008 = x15008
+	z15009 = x15009
+	z15010 = x15010
+	z15011 = x15011
+	z15012 = x15012
+	z15013 = x15013
+	z15014 = x15014
+	z15015 = x15015
+	z15016 = x15016
+	z15017 = x15017
+	z15018 = x15018
+	z15019 = x15019
+	z15020 = x15020
+	z15021 = x15021
+	z15022 = x15022
+	z15023 = x15023
+	z15024 = x15024
+	z15025 = x15025
+	z15026 = x15026
+	z15027 = x15027
+	z15028 = x15028
+	z15029 = x15029
+	z15030 = x15030
+	z15031 = x15031
+	z15032 = x15032
+	z15033 = x15033
+	z15034 = x15034
+	z15035 = x15035
+	z15036 = x15036
+	z15037 = x15037
+	z15038 = x15038
+	z15039 = x15039
+	z15040 = x15040
+	z15041 = x15041
+	z15042 = x15042
+	z15043 = x15043
+	z15044 = x15044
+	z15045 = x15045
+	z15046 = x15046
+	z15047 = x15047
+	z15048 = x15048
+	z15049 = x15049
+	z15050 = x15050
+	z15051 = x15051
+	z15052 = x15052
+	z15053 = x15053
+	z15054 = x15054
+	z15055 = x15055
+	z15056 = x15056
+	z15057 = x15057
+	z15058 = x15058
+	z15059 = x15059
+	z15060 = x15060
+	z15061 = x15061
+	z15062 = x15062
+	z15063 = x15063
+	z15064 = x15064
+	z15065 = x15065
+	z15066 = x15066
+	z15067 = x15067
+	z15068 = x15068
+	z15069 = x15069
+	z15070 = x15070
+	z15071 = x15071
+	z15072 = x15072
+	z15073 = x15073
+	z15074 = x15074
+	z15075 = x15075
+	z15076 = x15076
+	z15077 = x15077
+	z15078 = x15078
+	z15079 = x15079
+	z15080 = x15080
+	z15081 = x15081
+	z15082 = x15082
+	z15083 = x15083
+	z15084 = x15084
+	z15085 = x15085
+	z15086 = x15086
+	z15087 = x15087
+	z15088 = x15088
+	z15089 = x15089
+	z15090 = x15090
+	z15091 = x15091
+	z15092 = x15092
+	z15093 = x15093
+	z15094 = x15094
+	z15095 = x15095
+	z15096 = x15096
+	z15097 = x15097
+	z15098 = x15098
+	z15099 = x15099
+	z15100 = x15100
+	z15101 = x15101
+	z15102 = x15102
+	z15103 = x15103
+	z15104 = x15104
+	z15105 = x15105
+	z15106 = x15106
+	z15107 = x15107
+	z15108 = x15108
+	z15109 = x15109
+	z15110 = x15110
+	z15111 = x15111
+	z15112 = x15112
+	z15113 = x15113
+	z15114 = x15114
+	z15115 = x15115
+	z15116 = x15116
+	z15117 = x15117
+	z15118 = x15118
+	z15119 = x15119
+	z15120 = x15120
+	z15121 = x15121
+	z15122 = x15122
+	z15123 = x15123
+	z15124 = x15124
+	z15125 = x15125
+	z15126 = x15126
+	z15127 = x15127
+	z15128 = x15128
+	z15129 = x15129
+	z15130 = x15130
+	z15131 = x15131
+	z15132 = x15132
+	z15133 = x15133
+	z15134 = x15134
+	z15135 = x15135
+	z15136 = x15136
+	z15137 = x15137
+	z15138 = x15138
+	z15139 = x15139
+	z15140 = x15140
+	z15141 = x15141
+	z15142 = x15142
+	z15143 = x15143
+	z15144 = x15144
+	z15145 = x15145
+	z15146 = x15146
+	z15147 = x15147
+	z15148 = x15148
+	z15149 = x15149
+	z15150 = x15150
+	z15151 = x15151
+	z15152 = x15152
+	z15153 = x15153
+	z15154 = x15154
+	z15155 = x15155
+	z15156 = x15156
+	z15157 = x15157
+	z15158 = x15158
+	z15159 = x15159
+	z15160 = x15160
+	z15161 = x15161
+	z15162 = x15162
+	z15163 = x15163
+	z15164 = x15164
+	z15165 = x15165
+	z15166 = x15166
+	z15167 = x15167
+	z15168 = x15168
+	z15169 = x15169
+	z15170 = x15170
+	z15171 = x15171
+	z15172 = x15172
+	z15173 = x15173
+	z15174 = x15174
+	z15175 = x15175
+	z15176 = x15176
+	z15177 = x15177
+	z15178 = x15178
+	z15179 = x15179
+	z15180 = x15180
+	z15181 = x15181
+	z15182 = x15182
+	z15183 = x15183
+	z15184 = x15184
+	z15185 = x15185
+	z15186 = x15186
+	z15187 = x15187
+	z15188 = x15188
+	z15189 = x15189
+	z15190 = x15190
+	z15191 = x15191
+	z15192 = x15192
+	z15193 = x15193
+	z15194 = x15194
+	z15195 = x15195
+	z15196 = x15196
+	z15197 = x15197
+	z15198 = x15198
+	z15199 = x15199
+	z15200 = x15200
+	z15201 = x15201
+	z15202 = x15202
+	z15203 = x15203
+	z15204 = x15204
+	z15205 = x15205
+	z15206 = x15206
+	z15207 = x15207
+	z15208 = x15208
+	z15209 = x15209
+	z15210 = x15210
+	z15211 = x15211
+	z15212 = x15212
+	z15213 = x15213
+	z15214 = x15214
+	z15215 = x15215
+	z15216 = x15216
+	z15217 = x15217
+	z15218 = x15218
+	z15219 = x15219
+	z15220 = x15220
+	z15221 = x15221
+	z15222 = x15222
+	z15223 = x15223
+	z15224 = x15224
+	z15225 = x15225
+	z15226 = x15226
+	z15227 = x15227
+	z15228 = x15228
+	z15229 = x15229
+	z15230 = x15230
+	z15231 = x15231
+	z15232 = x15232
+	z15233 = x15233
+	z15234 = x15234
+	z15235 = x15235
+	z15236 = x15236
+	z15237 = x15237
+	z15238 = x15238
+	z15239 = x15239
+	z15240 = x15240
+	z15241 = x15241
+	z15242 = x15242
+	z15243 = x15243
+	z15244 = x15244
+	z15245 = x15245
+	z15246 = x15246
+	z15247 = x15247
+	z15248 = x15248
+	z15249 = x15249
+	z15250 = x15250
+	z15251 = x15251
+	z15252 = x15252
+	z15253 = x15253
+	z15254 = x15254
+	z15255 = x15255
+	z15256 = x15256
+	z15257 = x15257
+	z15258 = x15258
+	z15259 = x15259
+	z15260 = x15260
+	z15261 = x15261
+	z15262 = x15262
+	z15263 = x15263
+	z15264 = x15264
+	z15265 = x15265
+	z15266 = x15266
+	z15267 = x15267
+	z15268 = x15268
+	z15269 = x15269
+	z15270 = x15270
+	z15271 = x15271
+	z15272 = x15272
+	z15273 = x15273
+	z15274 = x15274
+	z15275 = x15275
+	z15276 = x15276
+	z15277 = x15277
+	z15278 = x15278
+	z15279 = x15279
+	z15280 = x15280
+	z15281 = x15281
+	z15282 = x15282
+	z15283 = x15283
+	z15284 = x15284
+	z15285 = x15285
+	z15286 = x15286
+	z15287 = x15287
+	z15288 = x15288
+	z15289 = x15289
+	z15290 = x15290
+	z15291 = x15291
+	z15292 = x15292
+	z15293 = x15293
+	z15294 = x15294
+	z15295 = x15295
+	z15296 = x15296
+	z15297 = x15297
+	z15298 = x15298
+	z15299 = x15299
+	z15300 = x15300
+	z15301 = x15301
+	z15302 = x15302
+	z15303 = x15303
+	z15304 = x15304
+	z15305 = x15305
+	z15306 = x15306
+	z15307 = x15307
+	z15308 = x15308
+	z15309 = x15309
+	z15310 = x15310
+	z15311 = x15311
+	z15312 = x15312
+	z15313 = x15313
+	z15314 = x15314
+	z15315 = x15315
+	z15316 = x15316
+	z15317 = x15317
+	z15318 = x15318
+	z15319 = x15319
+	z15320 = x15320
+	z15321 = x15321
+	z15322 = x15322
+	z15323 = x15323
+	z15324 = x15324
+	z15325 = x15325
+	z15326 = x15326
+	z15327 = x15327
+	z15328 = x15328
+	z15329 = x15329
+	z15330 = x15330
+	z15331 = x15331
+	z15332 = x15332
+	z15333 = x15333
+	z15334 = x15334
+	z15335 = x15335
+	z15336 = x15336
+	z15337 = x15337
+	z15338 = x15338
+	z15339 = x15339
+	z15340 = x15340
+	z15341 = x15341
+	z15342 = x15342
+	z15343 = x15343
+	z15344 = x15344
+	z15345 = x15345
+	z15346 = x15346
+	z15347 = x15347
+	z15348 = x15348
+	z15349 = x15349
+	z15350 = x15350
+	z15351 = x15351
+	z15352 = x15352
+	z15353 = x15353
+	z15354 = x15354
+	z15355 = x15355
+	z15356 = x15356
+	z15357 = x15357
+	z15358 = x15358
+	z15359 = x15359
+	z15360 = x15360
+	z15361 = x15361
+	z15362 = x15362
+	z15363 = x15363
+	z15364 = x15364
+	z15365 = x15365
+	z15366 = x15366
+	z15367 = x15367
+	z15368 = x15368
+	z15369 = x15369
+	z15370 = x15370
+	z15371 = x15371
+	z15372 = x15372
+	z15373 = x15373
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+	z15375 = x15375
+	z15376 = x15376
+	z15377 = x15377
+	z15378 = x15378
+	z15379 = x15379
+	z15380 = x15380
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+	z15382 = x15382
+	z15383 = x15383
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+	z15385 = x15385
+	z15386 = x15386
+	z15387 = x15387
+	z15388 = x15388
+	z15389 = x15389
+	z15390 = x15390
+	z15391 = x15391
+	z15392 = x15392
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+	z15395 = x15395
+	z15396 = x15396
+	z15397 = x15397
+	z15398 = x15398
+	z15399 = x15399
+	z15400 = x15400
+	z15401 = x15401
+	z15402 = x15402
+	z15403 = x15403
+	z15404 = x15404
+	z15405 = x15405
+	z15406 = x15406
+	z15407 = x15407
+	z15408 = x15408
+	z15409 = x15409
+	z15410 = x15410
+	z15411 = x15411
+	z15412 = x15412
+	z15413 = x15413
+	z15414 = x15414
+	z15415 = x15415
+	z15416 = x15416
+	z15417 = x15417
+	z15418 = x15418
+	z15419 = x15419
+	z15420 = x15420
+	z15421 = x15421
+	z15422 = x15422
+	z15423 = x15423
+	z15424 = x15424
+	z15425 = x15425
+	z15426 = x15426
+	z15427 = x15427
+	z15428 = x15428
+	z15429 = x15429
+	z15430 = x15430
+	z15431 = x15431
+	z15432 = x15432
+	z15433 = x15433
+	z15434 = x15434
+	z15435 = x15435
+	z15436 = x15436
+	z15437 = x15437
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+	z15440 = x15440
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+	z15445 = x15445
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+	z15451 = x15451
+	z15452 = x15452
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+	z15455 = x15455
+	z15456 = x15456
+	z15457 = x15457
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+	z15460 = x15460
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+	z15483 = x15483
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+	z15485 = x15485
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+	z15496 = x15496
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+	z15499 = x15499
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+	z15510 = x15510
+	z15511 = x15511
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+	z15513 = x15513
+	z15514 = x15514
+	z15515 = x15515
+	z15516 = x15516
+	z15517 = x15517
+	z15518 = x15518
+	z15519 = x15519
+	z15520 = x15520
+	z15521 = x15521
+	z15522 = x15522
+	z15523 = x15523
+	z15524 = x15524
+	z15525 = x15525
+	z15526 = x15526
+	z15527 = x15527
+	z15528 = x15528
+	z15529 = x15529
+	z15530 = x15530
+	z15531 = x15531
+	z15532 = x15532
+	z15533 = x15533
+	z15534 = x15534
+	z15535 = x15535
+	z15536 = x15536
+	z15537 = x15537
+	z15538 = x15538
+	z15539 = x15539
+	z15540 = x15540
+	z15541 = x15541
+	z15542 = x15542
+	z15543 = x15543
+	z15544 = x15544
+	z15545 = x15545
+	z15546 = x15546
+	z15547 = x15547
+	z15548 = x15548
+	z15549 = x15549
+	z15550 = x15550
+	z15551 = x15551
+	z15552 = x15552
+	z15553 = x15553
+	z15554 = x15554
+	z15555 = x15555
+	z15556 = x15556
+	z15557 = x15557
+	z15558 = x15558
+	z15559 = x15559
+	z15560 = x15560
+	z15561 = x15561
+	z15562 = x15562
+	z15563 = x15563
+	z15564 = x15564
+	z15565 = x15565
+	z15566 = x15566
+	z15567 = x15567
+	z15568 = x15568
+	z15569 = x15569
+	z15570 = x15570
+	z15571 = x15571
+	z15572 = x15572
+	z15573 = x15573
+	z15574 = x15574
+	z15575 = x15575
+	z15576 = x15576
+	z15577 = x15577
+	z15578 = x15578
+	z15579 = x15579
+	z15580 = x15580
+	z15581 = x15581
+	z15582 = x15582
+	z15583 = x15583
+	z15584 = x15584
+	z15585 = x15585
+	z15586 = x15586
+	z15587 = x15587
+	z15588 = x15588
+	z15589 = x15589
+	z15590 = x15590
+	z15591 = x15591
+	z15592 = x15592
+	z15593 = x15593
+	z15594 = x15594
+	z15595 = x15595
+	z15596 = x15596
+	z15597 = x15597
+	z15598 = x15598
+	z15599 = x15599
+	z15600 = x15600
+	z15601 = x15601
+	z15602 = x15602
+	z15603 = x15603
+	z15604 = x15604
+	z15605 = x15605
+	z15606 = x15606
+	z15607 = x15607
+	z15608 = x15608
+	z15609 = x15609
+	z15610 = x15610
+	z15611 = x15611
+	z15612 = x15612
+	z15613 = x15613
+	z15614 = x15614
+	z15615 = x15615
+	z15616 = x15616
+	z15617 = x15617
+	z15618 = x15618
+	z15619 = x15619
+	z15620 = x15620
+	z15621 = x15621
+	z15622 = x15622
+	z15623 = x15623
+	z15624 = x15624
+	z15625 = x15625
+	z15626 = x15626
+	z15627 = x15627
+	z15628 = x15628
+	z15629 = x15629
+	z15630 = x15630
+	z15631 = x15631
+	z15632 = x15632
+	z15633 = x15633
+	z15634 = x15634
+	z15635 = x15635
+	z15636 = x15636
+	z15637 = x15637
+	z15638 = x15638
+	z15639 = x15639
+	z15640 = x15640
+	z15641 = x15641
+	z15642 = x15642
+	z15643 = x15643
+	z15644 = x15644
+	z15645 = x15645
+	z15646 = x15646
+	z15647 = x15647
+	z15648 = x15648
+	z15649 = x15649
+	z15650 = x15650
+	z15651 = x15651
+	z15652 = x15652
+	z15653 = x15653
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+	z15655 = x15655
+	z15656 = x15656
+	z15657 = x15657
+	z15658 = x15658
+	z15659 = x15659
+	z15660 = x15660
+	z15661 = x15661
+	z15662 = x15662
+	z15663 = x15663
+	z15664 = x15664
+	z15665 = x15665
+	z15666 = x15666
+	z15667 = x15667
+	z15668 = x15668
+	z15669 = x15669
+	z15670 = x15670
+	z15671 = x15671
+	z15672 = x15672
+	z15673 = x15673
+	z15674 = x15674
+	z15675 = x15675
+	z15676 = x15676
+	z15677 = x15677
+	z15678 = x15678
+	z15679 = x15679
+	z15680 = x15680
+	z15681 = x15681
+	z15682 = x15682
+	z15683 = x15683
+	z15684 = x15684
+	z15685 = x15685
+	z15686 = x15686
+	z15687 = x15687
+	z15688 = x15688
+	z15689 = x15689
+	z15690 = x15690
+	z15691 = x15691
+	z15692 = x15692
+	z15693 = x15693
+	z15694 = x15694
+	z15695 = x15695
+	z15696 = x15696
+	z15697 = x15697
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+	z15699 = x15699
+	z15700 = x15700
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+	z15703 = x15703
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+	z15705 = x15705
+	z15706 = x15706
+	z15707 = x15707
+	z15708 = x15708
+	z15709 = x15709
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+	z15713 = x15713
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+	z15715 = x15715
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+	z15717 = x15717
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+	z15719 = x15719
+	z15720 = x15720
+	z15721 = x15721
+	z15722 = x15722
+	z15723 = x15723
+	z15724 = x15724
+	z15725 = x15725
+	z15726 = x15726
+	z15727 = x15727
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+	z15729 = x15729
+	z15730 = x15730
+	z15731 = x15731
+	z15732 = x15732
+	z15733 = x15733
+	z15734 = x15734
+	z15735 = x15735
+	z15736 = x15736
+	z15737 = x15737
+	z15738 = x15738
+	z15739 = x15739
+	z15740 = x15740
+	z15741 = x15741
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+	z15749 = x15749
+	z15750 = x15750
+	z15751 = x15751
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+	z15753 = x15753
+	z15754 = x15754
+	z15755 = x15755
+	z15756 = x15756
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+	z15759 = x15759
+	z15760 = x15760
+	z15761 = x15761
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+	z15763 = x15763
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+	z15765 = x15765
+	z15766 = x15766
+	z15767 = x15767
+	z15768 = x15768
+	z15769 = x15769
+	z15770 = x15770
+	z15771 = x15771
+	z15772 = x15772
+	z15773 = x15773
+	z15774 = x15774
+	z15775 = x15775
+	z15776 = x15776
+	z15777 = x15777
+	z15778 = x15778
+	z15779 = x15779
+	z15780 = x15780
+	z15781 = x15781
+	z15782 = x15782
+	z15783 = x15783
+	z15784 = x15784
+	z15785 = x15785
+	z15786 = x15786
+	z15787 = x15787
+	z15788 = x15788
+	z15789 = x15789
+	z15790 = x15790
+	z15791 = x15791
+	z15792 = x15792
+	z15793 = x15793
+	z15794 = x15794
+	z15795 = x15795
+	z15796 = x15796
+	z15797 = x15797
+	z15798 = x15798
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+	z15800 = x15800
+	z15801 = x15801
+	z15802 = x15802
+	z15803 = x15803
+	z15804 = x15804
+	z15805 = x15805
+	z15806 = x15806
+	z15807 = x15807
+	z15808 = x15808
+	z15809 = x15809
+	z15810 = x15810
+	z15811 = x15811
+	z15812 = x15812
+	z15813 = x15813
+	z15814 = x15814
+	z15815 = x15815
+	z15816 = x15816
+	z15817 = x15817
+	z15818 = x15818
+	z15819 = x15819
+	z15820 = x15820
+	z15821 = x15821
+	z15822 = x15822
+	z15823 = x15823
+	z15824 = x15824
+	z15825 = x15825
+	z15826 = x15826
+	z15827 = x15827
+	z15828 = x15828
+	z15829 = x15829
+	z15830 = x15830
+	z15831 = x15831
+	z15832 = x15832
+	z15833 = x15833
+	z15834 = x15834
+	z15835 = x15835
+	z15836 = x15836
+	z15837 = x15837
+	z15838 = x15838
+	z15839 = x15839
+	z15840 = x15840
+	z15841 = x15841
+	z15842 = x15842
+	z15843 = x15843
+	z15844 = x15844
+	z15845 = x15845
+	z15846 = x15846
+	z15847 = x15847
+	z15848 = x15848
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+	z15855 = x15855
+	z15856 = x15856
+	z15857 = x15857
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+	z15859 = x15859
+	z15860 = x15860
+	z15861 = x15861
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+	z15863 = x15863
+	z15864 = x15864
+	z15865 = x15865
+	z15866 = x15866
+	z15867 = x15867
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+	z15869 = x15869
+	z15870 = x15870
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+	z15873 = x15873
+	z15874 = x15874
+	z15875 = x15875
+	z15876 = x15876
+	z15877 = x15877
+	z15878 = x15878
+	z15879 = x15879
+	z15880 = x15880
+	z15881 = x15881
+	z15882 = x15882
+	z15883 = x15883
+	z15884 = x15884
+	z15885 = x15885
+	z15886 = x15886
+	z15887 = x15887
+	z15888 = x15888
+	z15889 = x15889
+	z15890 = x15890
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+	z15892 = x15892
+	z15893 = x15893
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+	z15895 = x15895
+	z15896 = x15896
+	z15897 = x15897
+	z15898 = x15898
+	z15899 = x15899
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+	z15904 = x15904
+	z15905 = x15905
+	z15906 = x15906
+	z15907 = x15907
+	z15908 = x15908
+	z15909 = x15909
+	z15910 = x15910
+	z15911 = x15911
+	z15912 = x15912
+	z15913 = x15913
+	z15914 = x15914
+	z15915 = x15915
+	z15916 = x15916
+	z15917 = x15917
+	z15918 = x15918
+	z15919 = x15919
+	z15920 = x15920
+	z15921 = x15921
+	z15922 = x15922
+	z15923 = x15923
+	z15924 = x15924
+	z15925 = x15925
+	z15926 = x15926
+	z15927 = x15927
+	z15928 = x15928
+	z15929 = x15929
+	z15930 = x15930
+	z15931 = x15931
+	z15932 = x15932
+	z15933 = x15933
+	z15934 = x15934
+	z15935 = x15935
+	z15936 = x15936
+	z15937 = x15937
+	z15938 = x15938
+	z15939 = x15939
+	z15940 = x15940
+	z15941 = x15941
+	z15942 = x15942
+	z15943 = x15943
+	z15944 = x15944
+	z15945 = x15945
+	z15946 = x15946
+	z15947 = x15947
+	z15948 = x15948
+	z15949 = x15949
+	z15950 = x15950
+	z15951 = x15951
+	z15952 = x15952
+	z15953 = x15953
+	z15954 = x15954
+	z15955 = x15955
+	z15956 = x15956
+	z15957 = x15957
+	z15958 = x15958
+	z15959 = x15959
+	z15960 = x15960
+	z15961 = x15961
+	z15962 = x15962
+	z15963 = x15963
+	z15964 = x15964
+	z15965 = x15965
+	z15966 = x15966
+	z15967 = x15967
+	z15968 = x15968
+	z15969 = x15969
+	z15970 = x15970
+	z15971 = x15971
+	z15972 = x15972
+	z15973 = x15973
+	z15974 = x15974
+	z15975 = x15975
+	z15976 = x15976
+	z15977 = x15977
+	z15978 = x15978
+	z15979 = x15979
+	z15980 = x15980
+	z15981 = x15981
+	z15982 = x15982
+	z15983 = x15983
+	z15984 = x15984
+	z15985 = x15985
+	z15986 = x15986
+	z15987 = x15987
+	z15988 = x15988
+	z15989 = x15989
+	z15990 = x15990
+	z15991 = x15991
+	z15992 = x15992
+	z15993 = x15993
+	z15994 = x15994
+	z15995 = x15995
+	z15996 = x15996
+	z15997 = x15997
+	z15998 = x15998
+	z15999 = x15999
+	z16000 = x16000
+	z16001 = x16001
+	z16002 = x16002
+	z16003 = x16003
+	z16004 = x16004
+	z16005 = x16005
+	z16006 = x16006
+	z16007 = x16007
+	z16008 = x16008
+	z16009 = x16009
+	z16010 = x16010
+	z16011 = x16011
+	z16012 = x16012
+	z16013 = x16013
+	z16014 = x16014
+	z16015 = x16015
+	z16016 = x16016
+	z16017 = x16017
+	z16018 = x16018
+	z16019 = x16019
+	z16020 = x16020
+	z16021 = x16021
+	z16022 = x16022
+	z16023 = x16023
+	z16024 = x16024
+	z16025 = x16025
+	z16026 = x16026
+	z16027 = x16027
+	z16028 = x16028
+	z16029 = x16029
+	z16030 = x16030
+	z16031 = x16031
+	z16032 = x16032
+	z16033 = x16033
+	z16034 = x16034
+	z16035 = x16035
+	z16036 = x16036
+	z16037 = x16037
+	z16038 = x16038
+	z16039 = x16039
+	z16040 = x16040
+	z16041 = x16041
+	z16042 = x16042
+	z16043 = x16043
+	z16044 = x16044
+	z16045 = x16045
+	z16046 = x16046
+	z16047 = x16047
+	z16048 = x16048
+	z16049 = x16049
+	z16050 = x16050
+	z16051 = x16051
+	z16052 = x16052
+	z16053 = x16053
+	z16054 = x16054
+	z16055 = x16055
+	z16056 = x16056
+	z16057 = x16057
+	z16058 = x16058
+	z16059 = x16059
+	z16060 = x16060
+	z16061 = x16061
+	z16062 = x16062
+	z16063 = x16063
+	z16064 = x16064
+	z16065 = x16065
+	z16066 = x16066
+	z16067 = x16067
+	z16068 = x16068
+	z16069 = x16069
+	z16070 = x16070
+	z16071 = x16071
+	z16072 = x16072
+	z16073 = x16073
+	z16074 = x16074
+	z16075 = x16075
+	z16076 = x16076
+	z16077 = x16077
+	z16078 = x16078
+	z16079 = x16079
+	z16080 = x16080
+	z16081 = x16081
+	z16082 = x16082
+	z16083 = x16083
+	z16084 = x16084
+	z16085 = x16085
+	z16086 = x16086
+	z16087 = x16087
+	z16088 = x16088
+	z16089 = x16089
+	z16090 = x16090
+	z16091 = x16091
+	z16092 = x16092
+	z16093 = x16093
+	z16094 = x16094
+	z16095 = x16095
+	z16096 = x16096
+	z16097 = x16097
+	z16098 = x16098
+	z16099 = x16099
+	z16100 = x16100
+	z16101 = x16101
+	z16102 = x16102
+	z16103 = x16103
+	z16104 = x16104
+	z16105 = x16105
+	z16106 = x16106
+	z16107 = x16107
+	z16108 = x16108
+	z16109 = x16109
+	z16110 = x16110
+	z16111 = x16111
+	z16112 = x16112
+	z16113 = x16113
+	z16114 = x16114
+	z16115 = x16115
+	z16116 = x16116
+	z16117 = x16117
+	z16118 = x16118
+	z16119 = x16119
+	z16120 = x16120
+	z16121 = x16121
+	z16122 = x16122
+	z16123 = x16123
+	z16124 = x16124
+	z16125 = x16125
+	z16126 = x16126
+	z16127 = x16127
+	z16128 = x16128
+	z16129 = x16129
+	z16130 = x16130
+	z16131 = x16131
+	z16132 = x16132
+	z16133 = x16133
+	z16134 = x16134
+	z16135 = x16135
+	z16136 = x16136
+	z16137 = x16137
+	z16138 = x16138
+	z16139 = x16139
+	z16140 = x16140
+	z16141 = x16141
+	z16142 = x16142
+	z16143 = x16143
+	z16144 = x16144
+	z16145 = x16145
+	z16146 = x16146
+	z16147 = x16147
+	z16148 = x16148
+	z16149 = x16149
+	z16150 = x16150
+	z16151 = x16151
+	z16152 = x16152
+	z16153 = x16153
+	z16154 = x16154
+	z16155 = x16155
+	z16156 = x16156
+	z16157 = x16157
+	z16158 = x16158
+	z16159 = x16159
+	z16160 = x16160
+	z16161 = x16161
+	z16162 = x16162
+	z16163 = x16163
+	z16164 = x16164
+	z16165 = x16165
+	z16166 = x16166
+	z16167 = x16167
+	z16168 = x16168
+	z16169 = x16169
+	z16170 = x16170
+	z16171 = x16171
+	z16172 = x16172
+	z16173 = x16173
+	z16174 = x16174
+	z16175 = x16175
+	z16176 = x16176
+	z16177 = x16177
+	z16178 = x16178
+	z16179 = x16179
+	z16180 = x16180
+	z16181 = x16181
+	z16182 = x16182
+	z16183 = x16183
+	z16184 = x16184
+	z16185 = x16185
+	z16186 = x16186
+	z16187 = x16187
+	z16188 = x16188
+	z16189 = x16189
+	z16190 = x16190
+	z16191 = x16191
+	z16192 = x16192
+	z16193 = x16193
+	z16194 = x16194
+	z16195 = x16195
+	z16196 = x16196
+	z16197 = x16197
+	z16198 = x16198
+	z16199 = x16199
+	z16200 = x16200
+	z16201 = x16201
+	z16202 = x16202
+	z16203 = x16203
+	z16204 = x16204
+	z16205 = x16205
+	z16206 = x16206
+	z16207 = x16207
+	z16208 = x16208
+	z16209 = x16209
+	z16210 = x16210
+	z16211 = x16211
+	z16212 = x16212
+	z16213 = x16213
+	z16214 = x16214
+	z16215 = x16215
+	z16216 = x16216
+	z16217 = x16217
+	z16218 = x16218
+	z16219 = x16219
+	z16220 = x16220
+	z16221 = x16221
+	z16222 = x16222
+	z16223 = x16223
+	z16224 = x16224
+	z16225 = x16225
+	z16226 = x16226
+	z16227 = x16227
+	z16228 = x16228
+	z16229 = x16229
+	z16230 = x16230
+	z16231 = x16231
+	z16232 = x16232
+	z16233 = x16233
+	z16234 = x16234
+	z16235 = x16235
+	z16236 = x16236
+	z16237 = x16237
+	z16238 = x16238
+	z16239 = x16239
+	z16240 = x16240
+	z16241 = x16241
+	z16242 = x16242
+	z16243 = x16243
+	z16244 = x16244
+	z16245 = x16245
+	z16246 = x16246
+	z16247 = x16247
+	z16248 = x16248
+	z16249 = x16249
+	z16250 = x16250
+	z16251 = x16251
+	z16252 = x16252
+	z16253 = x16253
+	z16254 = x16254
+	z16255 = x16255
+	z16256 = x16256
+	z16257 = x16257
+	z16258 = x16258
+	z16259 = x16259
+	z16260 = x16260
+	z16261 = x16261
+	z16262 = x16262
+	z16263 = x16263
+	z16264 = x16264
+	z16265 = x16265
+	z16266 = x16266
+	z16267 = x16267
+	z16268 = x16268
+	z16269 = x16269
+	z16270 = x16270
+	z16271 = x16271
+	z16272 = x16272
+	z16273 = x16273
+	z16274 = x16274
+	z16275 = x16275
+	z16276 = x16276
+	z16277 = x16277
+	z16278 = x16278
+	z16279 = x16279
+	z16280 = x16280
+	z16281 = x16281
+	z16282 = x16282
+	z16283 = x16283
+	z16284 = x16284
+	z16285 = x16285
+	z16286 = x16286
+	z16287 = x16287
+	z16288 = x16288
+	z16289 = x16289
+	z16290 = x16290
+	z16291 = x16291
+	z16292 = x16292
+	z16293 = x16293
+	z16294 = x16294
+	z16295 = x16295
+	z16296 = x16296
+	z16297 = x16297
+	z16298 = x16298
+	z16299 = x16299
+	z16300 = x16300
+	z16301 = x16301
+	z16302 = x16302
+	z16303 = x16303
+	z16304 = x16304
+	z16305 = x16305
+	z16306 = x16306
+	z16307 = x16307
+	z16308 = x16308
+	z16309 = x16309
+	z16310 = x16310
+	z16311 = x16311
+	z16312 = x16312
+	z16313 = x16313
+	z16314 = x16314
+	z16315 = x16315
+	z16316 = x16316
+	z16317 = x16317
+	z16318 = x16318
+	z16319 = x16319
+	z16320 = x16320
+	z16321 = x16321
+	z16322 = x16322
+	z16323 = x16323
+	z16324 = x16324
+	z16325 = x16325
+	z16326 = x16326
+	z16327 = x16327
+	z16328 = x16328
+	z16329 = x16329
+	z16330 = x16330
+	z16331 = x16331
+	z16332 = x16332
+	z16333 = x16333
+	z16334 = x16334
+	z16335 = x16335
+	z16336 = x16336
+	z16337 = x16337
+	z16338 = x16338
+	z16339 = x16339
+	z16340 = x16340
+	z16341 = x16341
+	z16342 = x16342
+	z16343 = x16343
+	z16344 = x16344
+	z16345 = x16345
+	z16346 = x16346
+	z16347 = x16347
+	z16348 = x16348
+	z16349 = x16349
+	z16350 = x16350
+	z16351 = x16351
+	z16352 = x16352
+	z16353 = x16353
+	z16354 = x16354
+	z16355 = x16355
+	z16356 = x16356
+	z16357 = x16357
+	z16358 = x16358
+	z16359 = x16359
+	z16360 = x16360
+	z16361 = x16361
+	z16362 = x16362
+	z16363 = x16363
+	z16364 = x16364
+	z16365 = x16365
+	z16366 = x16366
+	z16367 = x16367
+	z16368 = x16368
+	z16369 = x16369
+	z16370 = x16370
+	z16371 = x16371
+	z16372 = x16372
+	z16373 = x16373
+	z16374 = x16374
+	z16375 = x16375
+	z16376 = x16376
+	z16377 = x16377
+	z16378 = x16378
+	z16379 = x16379
+	z16380 = x16380
+	z16381 = x16381
+	z16382 = x16382
+	z16383 = x16383
+	z16384 = x16384
+	z16385 = x16385
+	z16386 = x16386
+	z16387 = x16387
+	z16388 = x16388
+	z16389 = x16389
+	z16390 = x16390
+	z16391 = x16391
+	z16392 = x16392
+	z16393 = x16393
+	z16394 = x16394
+	z16395 = x16395
+	z16396 = x16396
+	z16397 = x16397
+	z16398 = x16398
+	z16399 = x16399
+	z16400 = x16400
+	z16401 = x16401
+	z16402 = x16402
+	z16403 = x16403
+	z16404 = x16404
+	z16405 = x16405
+	z16406 = x16406
+	z16407 = x16407
+	z16408 = x16408
+	z16409 = x16409
+	z16410 = x16410
+	z16411 = x16411
+	z16412 = x16412
+	z16413 = x16413
+	z16414 = x16414
+	z16415 = x16415
+	z16416 = x16416
+	z16417 = x16417
+	z16418 = x16418
+	z16419 = x16419
+	z16420 = x16420
+	z16421 = x16421
+	z16422 = x16422
+	z16423 = x16423
+	z16424 = x16424
+	z16425 = x16425
+	z16426 = x16426
+	z16427 = x16427
+	z16428 = x16428
+	z16429 = x16429
+	z16430 = x16430
+	z16431 = x16431
+	z16432 = x16432
+	z16433 = x16433
+	z16434 = x16434
+	z16435 = x16435
+	z16436 = x16436
+	z16437 = x16437
+	z16438 = x16438
+	z16439 = x16439
+	z16440 = x16440
+	z16441 = x16441
+	z16442 = x16442
+	z16443 = x16443
+	z16444 = x16444
+	z16445 = x16445
+	z16446 = x16446
+	z16447 = x16447
+	z16448 = x16448
+	z16449 = x16449
+	z16450 = x16450
+	z16451 = x16451
+	z16452 = x16452
+	z16453 = x16453
+	z16454 = x16454
+	z16455 = x16455
+	z16456 = x16456
+	z16457 = x16457
+	z16458 = x16458
+	z16459 = x16459
+	z16460 = x16460
+	z16461 = x16461
+	z16462 = x16462
+	z16463 = x16463
+	z16464 = x16464
+	z16465 = x16465
+	z16466 = x16466
+	z16467 = x16467
+	z16468 = x16468
+	z16469 = x16469
+	z16470 = x16470
+	z16471 = x16471
+	z16472 = x16472
+	z16473 = x16473
+	z16474 = x16474
+	z16475 = x16475
+	z16476 = x16476
+	z16477 = x16477
+	z16478 = x16478
+	z16479 = x16479
+	z16480 = x16480
 }
diff --git a/test/fixedbugs/bug388.go b/test/fixedbugs/bug388.go
index a060c9fd..0524534b 100644
--- a/test/fixedbugs/bug388.go
+++ b/test/fixedbugs/bug388.go
@@ -9,7 +9,7 @@
 package main
 import "runtime"
 
-func foo(runtime.UintType, i int) {  // ERROR "cannot declare name runtime.UintType|mixed named and unnamed|undefined identifier"
+func foo(runtime.UintType, i int) {  // ERROR "cannot declare name runtime.UintType|missing parameter name|undefined identifier"
 	println(i, runtime.UintType) // GCCGO_ERROR "undefined identifier"
 }
 
diff --git a/test/fixedbugs/issue11610.go b/test/fixedbugs/issue11610.go
index 8d68c98f..ec4d8e84 100644
--- a/test/fixedbugs/issue11610.go
+++ b/test/fixedbugs/issue11610.go
@@ -10,7 +10,7 @@
 package a
 var?      // ERROR "invalid character U\+003F '\?'|invalid character 0x3f in input file"
 
-var x int // ERROR "unexpected var|expected identifier|expected type"
+var x int // ERROR "unexpected keyword var|expected identifier|expected type"
 
 func main() {
 }
diff --git a/test/fixedbugs/issue16241.go b/test/fixedbugs/issue16241.go
new file mode 100644
index 00000000..a88dc9a4
--- /dev/null
+++ b/test/fixedbugs/issue16241.go
@@ -0,0 +1,79 @@
+// errorcheck -0 -m -l
+
+// Copyright 2023 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package foo
+
+import "sync/atomic"
+
+func AddInt32(x *int32) { // ERROR "x does not escape$"
+	atomic.AddInt32(x, 42)
+}
+func AddUint32(x *uint32) { // ERROR "x does not escape$"
+	atomic.AddUint32(x, 42)
+}
+func AddUintptr(x *uintptr) { // ERROR "x does not escape$"
+	atomic.AddUintptr(x, 42)
+}
+
+func AndInt32(x *int32) { // ERROR "x does not escape$"
+	atomic.AndInt32(x, 42)
+}
+func AndUint32(x *uint32) { // ERROR "x does not escape$"
+	atomic.AndUint32(x, 42)
+}
+func AndUintptr(x *uintptr) { // ERROR "x does not escape$"
+	atomic.AndUintptr(x, 42)
+}
+
+func CompareAndSwapInt32(x *int32) { // ERROR "x does not escape$"
+	atomic.CompareAndSwapInt32(x, 42, 42)
+}
+func CompareAndSwapUint32(x *uint32) { // ERROR "x does not escape$"
+	atomic.CompareAndSwapUint32(x, 42, 42)
+}
+func CompareAndSwapUintptr(x *uintptr) { // ERROR "x does not escape$"
+	atomic.CompareAndSwapUintptr(x, 42, 42)
+}
+
+func LoadInt32(x *int32) { // ERROR "x does not escape$"
+	atomic.LoadInt32(x)
+}
+func LoadUint32(x *uint32) { // ERROR "x does not escape$"
+	atomic.LoadUint32(x)
+}
+func LoadUintptr(x *uintptr) { // ERROR "x does not escape$"
+	atomic.LoadUintptr(x)
+}
+
+func OrInt32(x *int32) { // ERROR "x does not escape$"
+	atomic.OrInt32(x, 42)
+}
+func OrUint32(x *uint32) { // ERROR "x does not escape$"
+	atomic.OrUint32(x, 42)
+}
+func OrUintptr(x *uintptr) { // ERROR "x does not escape$"
+	atomic.OrUintptr(x, 42)
+}
+
+func StoreInt32(x *int32) { // ERROR "x does not escape$"
+	atomic.StoreInt32(x, 42)
+}
+func StoreUint32(x *uint32) { // ERROR "x does not escape$"
+	atomic.StoreUint32(x, 42)
+}
+func StoreUintptr(x *uintptr) { // ERROR "x does not escape$"
+	atomic.StoreUintptr(x, 42)
+}
+
+func SwapInt32(x *int32) { // ERROR "x does not escape$"
+	atomic.SwapInt32(x, 42)
+}
+func SwapUint32(x *uint32) { // ERROR "x does not escape$"
+	atomic.SwapUint32(x, 42)
+}
+func SwapUintptr(x *uintptr) { // ERROR "x does not escape$"
+	atomic.SwapUintptr(x, 42)
+}
diff --git a/test/fixedbugs/issue16241_64.go b/test/fixedbugs/issue16241_64.go
new file mode 100644
index 00000000..468444bd
--- /dev/null
+++ b/test/fixedbugs/issue16241_64.go
@@ -0,0 +1,60 @@
+//go:build !(386 || arm || mips || mipsle)
+
+// errorcheck -0 -m -l
+
+// Copyright 2023 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package foo
+
+import "sync/atomic"
+
+func AddInt64(x *int64) { // ERROR "x does not escape$"
+	atomic.AddInt64(x, 42)
+}
+func AddUint64(x *uint64) { // ERROR "x does not escape$"
+	atomic.AddUint64(x, 42)
+}
+
+func AndInt64(x *int64) { // ERROR "x does not escape$"
+	atomic.AndInt64(x, 42)
+}
+func AndUint64(x *uint64) { // ERROR "x does not escape$"
+	atomic.AndUint64(x, 42)
+}
+
+func CompareAndSwapInt64(x *int64) { // ERROR "x does not escape$"
+	atomic.CompareAndSwapInt64(x, 42, 42)
+}
+func CompareAndSwapUint64(x *uint64) { // ERROR "x does not escape$"
+	atomic.CompareAndSwapUint64(x, 42, 42)
+}
+
+func LoadInt64(x *int64) { // ERROR "x does not escape$"
+	atomic.LoadInt64(x)
+}
+func LoadUint64(x *uint64) { // ERROR "x does not escape$"
+	atomic.LoadUint64(x)
+}
+
+func OrInt64(x *int64) { // ERROR "x does not escape$"
+	atomic.OrInt64(x, 42)
+}
+func OrUint64(x *uint64) { // ERROR "x does not escape$"
+	atomic.OrUint64(x, 42)
+}
+
+func StoreInt64(x *int64) { // ERROR "x does not escape$"
+	atomic.StoreInt64(x, 42)
+}
+func StoreUint64(x *uint64) { // ERROR "x does not escape$"
+	atomic.StoreUint64(x, 42)
+}
+
+func SwapInt64(x *int64) { // ERROR "x does not escape$"
+	atomic.SwapInt64(x, 42)
+}
+func SwapUint64(x *uint64) { // ERROR "x does not escape$"
+	atomic.SwapUint64(x, 42)
+}
diff --git a/test/fixedbugs/issue20027.go b/test/fixedbugs/issue20027.go
new file mode 100644
index 00000000..e93b359a
--- /dev/null
+++ b/test/fixedbugs/issue20027.go
@@ -0,0 +1,13 @@
+// errorcheck
+
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package p
+
+var _ chan [0x2FFFF]byte         // ERROR "channel element type too large"
+var _ = make(chan [0x2FFFF]byte) // ERROR "channel element type too large"
+
+var c1 chan [0x2FFFF]byte         // ERROR "channel element type too large"
+var c2 = make(chan [0x2FFFF]byte) // ERROR "channel element type too large"
diff --git a/test/fixedbugs/issue24755.go b/test/fixedbugs/issue24755.go
new file mode 100644
index 00000000..705b15fb
--- /dev/null
+++ b/test/fixedbugs/issue24755.go
@@ -0,0 +1,19 @@
+// errorcheck
+
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package p
+
+type I interface {
+	F()
+}
+
+type T struct {
+}
+
+const _ = I((*T)(nil)) // ERROR "is not constant"
+
+func (*T) F() {
+}
diff --git a/test/fixedbugs/issue39292.go b/test/fixedbugs/issue39292.go
index 7dac2e5f..9a4840d0 100644
--- a/test/fixedbugs/issue39292.go
+++ b/test/fixedbugs/issue39292.go
@@ -27,3 +27,12 @@ func z() {
 	z := t{&i}.f // ERROR "t{...}.f escapes to heap"
 	z()
 }
+
+// Should match cmd/compile/internal/ir/cfg.go:MaxStackVarSize.
+const maxStack = 128 * 1024
+
+func w(i int) byte {
+	var x [maxStack]byte
+	var y [maxStack + 1]byte // ERROR "moved to heap: y"
+	return x[i] + y[i]
+}
diff --git a/test/fixedbugs/issue41575.go b/test/fixedbugs/issue41575.go
index 45687303..2eed37a9 100644
--- a/test/fixedbugs/issue41575.go
+++ b/test/fixedbugs/issue41575.go
@@ -6,7 +6,7 @@
 
 package p
 
-type T1 struct { // ERROR "invalid recursive type T1\n\tLINE: T1 refers to\n\tLINE+4: T2 refers to\n\tLINE: T1$|invalid recursive type"
+type T1 struct { // ERROR "invalid recursive type T1\n.*T1 refers to T2\n.*T2 refers to T1|invalid recursive type"
 	f2 T2
 }
 
@@ -15,21 +15,21 @@ type T2 struct { // GCCGO_ERROR "invalid recursive type"
 }
 
 type a b // GCCGO_ERROR "invalid recursive type"
-type b c // ERROR "invalid recursive type b\n\tLINE: b refers to\n\tLINE+1: c refers to\n\tLINE: b$|invalid recursive type"
+type b c // ERROR "invalid recursive type b\n.*b refers to c\n.*c refers to b|invalid recursive type|invalid recursive type"
 type c b // GCCGO_ERROR "invalid recursive type"
 
 type d e
 type e f
-type f f // ERROR "invalid recursive type f\n\tLINE: f refers to\n\tLINE: f$|invalid recursive type"
+type f f // ERROR "invalid recursive type: f refers to itself|invalid recursive type|invalid recursive type"
 
-type g struct { // ERROR "invalid recursive type g\n\tLINE: g refers to\n\tLINE: g$|invalid recursive type"
+type g struct { // ERROR "invalid recursive type: g refers to itself|invalid recursive type"
 	h struct {
 		g
 	}
 }
 
 type w x
-type x y           // ERROR "invalid recursive type x\n\tLINE: x refers to\n\tLINE+1: y refers to\n\tLINE+2: z refers to\n\tLINE: x$|invalid recursive type"
+type x y           // ERROR "invalid recursive type x\n.*x refers to y\n.*y refers to z\n.*z refers to x|invalid recursive type"
 type y struct{ z } // GCCGO_ERROR "invalid recursive type"
 type z [10]x
 
diff --git a/test/fixedbugs/issue48471.go b/test/fixedbugs/issue48471.go
index 75875c40..a834c806 100644
--- a/test/fixedbugs/issue48471.go
+++ b/test/fixedbugs/issue48471.go
@@ -51,6 +51,6 @@ func g() {
 	_ = i.(T6)  // ERROR "impossible type assertion: i.\(T6\)\n\tT6 does not implement I \(missing method M\)\n\t\thave m\(int\) string\n\t\twant M\(int\)"
 
 	var t *T4
-	t = i // ERROR "cannot use i \(variable of type I\) as \*T4 value in assignment: need type assertion"
+	t = i // ERROR "cannot use i \(variable of interface type I\) as \*T4 value in assignment: need type assertion"
 	_ = t
 }
diff --git a/test/fixedbugs/issue50788.dir/b.go b/test/fixedbugs/issue50788.dir/b.go
index e17afc7b..97ae2080 100644
--- a/test/fixedbugs/issue50788.dir/b.go
+++ b/test/fixedbugs/issue50788.dir/b.go
@@ -6,4 +6,4 @@ package b
 
 import "./a"
 
-type T a.T[T] // ERROR "invalid recursive type T\n.*T refers to\n.*a\.T refers to\n.*T"
+type T a.T[T] // ERROR "invalid recursive type T\n.*T refers to a\.T\n.*a\.T refers to T"
diff --git a/test/fixedbugs/issue52193.go b/test/fixedbugs/issue52193.go
index 32375d11..1c42210f 100644
--- a/test/fixedbugs/issue52193.go
+++ b/test/fixedbugs/issue52193.go
@@ -6,27 +6,6 @@
 
 package p
 
-import (
-	"crypto/ecdh"
-	"crypto/rand"
-)
-
-func F(peerShare []byte) ([]byte, error) { // ERROR "leaking param: peerShare"
-	p256 := ecdh.P256() // ERROR "inlining call to ecdh.P256"
-
-	ourKey, err := p256.GenerateKey(rand.Reader) // ERROR "devirtualizing p256.GenerateKey" "inlining call to ecdh.*GenerateKey"
-	if err != nil {
-		return nil, err
-	}
-
-	peerPublic, err := p256.NewPublicKey(peerShare) // ERROR "devirtualizing p256.NewPublicKey" "inlining call to ecdh.*NewPublicKey"
-	if err != nil {
-		return nil, err
-	}
-
-	return ourKey.ECDH(peerPublic)
-}
-
 // Test that inlining doesn't break if devirtualization exposes a new
 // inlinable callee.
 
diff --git a/test/fixedbugs/issue54159.go b/test/fixedbugs/issue54159.go
index 8ef0e684..0f607b38 100644
--- a/test/fixedbugs/issue54159.go
+++ b/test/fixedbugs/issue54159.go
@@ -11,6 +11,7 @@ func run() { // ERROR "cannot inline run: recursive"
 		g() // ERROR "inlining call to g"
 	}
 	f() // ERROR "inlining call to run.func1" "inlining call to g"
+	_ = f
 	run()
 }
 
diff --git a/test/fixedbugs/issue67329.go b/test/fixedbugs/issue67329.go
new file mode 100644
index 00000000..5595c31c
--- /dev/null
+++ b/test/fixedbugs/issue67329.go
@@ -0,0 +1,27 @@
+// errorcheck -0 -d=ssa/check_bce/debug=1
+
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package x
+
+func Found(x []string) string {
+	switch len(x) {
+	default:
+		return x[0]
+	case 0, 1:
+		return ""
+	}
+}
+
+func NotFound(x []string) string {
+	switch len(x) {
+	default:
+		return x[0]
+	case 0:
+		return ""
+	case 1:
+		return ""
+	}
+}
diff --git a/test/fixedbugs/issue68292.go b/test/fixedbugs/issue68292.go
new file mode 100644
index 00000000..2a0d8267
--- /dev/null
+++ b/test/fixedbugs/issue68292.go
@@ -0,0 +1,12 @@
+// errorcheck
+
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+func f[S any, T any](T) {}
+func g() {
+	f(0) // ERROR "in call to f, cannot infer S \(declared at issue68292.go:9:8\)"
+}
diff --git a/test/fixedbugs/issue68526.dir/a/a.go b/test/fixedbugs/issue68526.dir/a/a.go
new file mode 100644
index 00000000..83462c7f
--- /dev/null
+++ b/test/fixedbugs/issue68526.dir/a/a.go
@@ -0,0 +1,16 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build goexperiment.aliastypeparams
+
+package a
+
+type A[T any] = struct{ F T }
+
+type B = struct{ F int }
+
+func F() B {
+	type a[T any] = struct{ F T }
+	return a[int]{}
+}
diff --git a/test/fixedbugs/issue68526.dir/main.go b/test/fixedbugs/issue68526.dir/main.go
new file mode 100644
index 00000000..966efd71
--- /dev/null
+++ b/test/fixedbugs/issue68526.dir/main.go
@@ -0,0 +1,45 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build goexperiment.aliastypeparams
+
+package main
+
+import (
+	"fmt"
+
+	"issue68526.dir/a"
+)
+
+func main() {
+	unexported()
+	exported()
+}
+
+func unexported() {
+	var want struct{ F int }
+
+	if any(want) != any(a.B{}) || any(want) != any(a.F()) {
+		panic("zero value of alias and concrete type not identical")
+	}
+}
+
+func exported() {
+	var (
+		astr a.A[string]
+		aint a.A[int]
+	)
+
+	if any(astr) != any(struct{ F string }{}) || any(aint) != any(struct{ F int }{}) {
+		panic("zero value of alias and concrete type not identical")
+	}
+
+	if any(astr) == any(aint) {
+		panic("zero value of struct{ F string } and struct{ F int } are not distinct")
+	}
+
+	if got := fmt.Sprintf("%T", astr); got != "struct { F string }" {
+		panic(got)
+	}
+}
diff --git a/test/fixedbugs/issue68526.go b/test/fixedbugs/issue68526.go
new file mode 100644
index 00000000..3067aa76
--- /dev/null
+++ b/test/fixedbugs/issue68526.go
@@ -0,0 +1,7 @@
+// runindir -goexperiment aliastypeparams -gomodversion "1.23"
+
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package ignored
diff --git a/test/fixedbugs/issue68734.go b/test/fixedbugs/issue68734.go
new file mode 100644
index 00000000..e60dbc54
--- /dev/null
+++ b/test/fixedbugs/issue68734.go
@@ -0,0 +1,17 @@
+// compile
+
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// The gofrontend had a bug handling panic of an untyped constant expression.
+
+package issue68734
+
+func F1() {
+	panic(1 + 2)
+}
+
+func F2() {
+	panic("a" + "b")
+}
diff --git a/test/fixedbugs/issue68809.go b/test/fixedbugs/issue68809.go
new file mode 100644
index 00000000..67afda67
--- /dev/null
+++ b/test/fixedbugs/issue68809.go
@@ -0,0 +1,19 @@
+// run
+
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+func main() {
+	cnt := 0
+	for i := 1; i <= 11; i++ {
+		if i-6 > 4 {
+			cnt++
+		}
+	}
+	if cnt != 1 {
+		panic("bad")
+	}
+}
diff --git a/test/fixedbugs/issue68816.go b/test/fixedbugs/issue68816.go
new file mode 100644
index 00000000..8622c9aa
--- /dev/null
+++ b/test/fixedbugs/issue68816.go
@@ -0,0 +1,41 @@
+// run
+
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+func main() {
+	mustPanic(func() {
+		f1(1)
+	})
+	f2(1, 0) // must not panic
+	mustPanic(func() {
+		f2(1, 2)
+	})
+}
+
+var v []func()
+
+//go:noinline
+func f1(i int) {
+	v = make([]func(), -2|i)
+}
+
+//go:noinline
+func f2(i, j int) {
+	if j > 0 {
+		v = make([]func(), -2|i)
+	}
+}
+
+func mustPanic(f func()) {
+	defer func() {
+		r := recover()
+		if r == nil {
+			panic("didn't panic")
+		}
+	}()
+	f()
+}
diff --git a/test/fixedbugs/issue69110.go b/test/fixedbugs/issue69110.go
index 71a4bcac..ab51d0b5 100644
--- a/test/fixedbugs/issue69110.go
+++ b/test/fixedbugs/issue69110.go
@@ -1,5 +1,7 @@
 // run
 
+//go:build !goexperiment.swissmap
+
 // Copyright 2024 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
diff --git a/test/fixedbugs/issue69434.go b/test/fixedbugs/issue69434.go
index 68204660..026d3246 100644
--- a/test/fixedbugs/issue69434.go
+++ b/test/fixedbugs/issue69434.go
@@ -7,167 +7,55 @@
 package main
 
 import (
-	"bufio"
-	"fmt"
-	"io"
 	"iter"
-	"math/rand"
-	"os"
-	"strings"
-	"unicode"
 )
 
-// WordReader is the struct that implements io.Reader
-type WordReader struct {
-	scanner *bufio.Scanner
-}
-
-// NewWordReader creates a new WordReader from an io.Reader
-func NewWordReader(r io.Reader) *WordReader {
-	scanner := bufio.NewScanner(r)
-	scanner.Split(bufio.ScanWords)
-	return &WordReader{
-		scanner: scanner,
-	}
-}
-
-// Read reads data from the input stream and returns a single lowercase word at a time
-func (wr *WordReader) Read(p []byte) (n int, err error) {
-	if !wr.scanner.Scan() {
-		if err := wr.scanner.Err(); err != nil {
-			return 0, err
-		}
-		return 0, io.EOF
-	}
-	word := wr.scanner.Text()
-	cleanedWord := removeNonAlphabetic(word)
-	if len(cleanedWord) == 0 {
-		return wr.Read(p)
-	}
-	n = copy(p, []byte(cleanedWord))
-	return n, nil
-}
-
-// All returns an iterator allowing the caller to iterate over the WordReader using for/range.
-func (wr *WordReader) All() iter.Seq[string] {
-	word := make([]byte, 1024)
-	return func(yield func(string) bool) {
-		var err error
-		var n int
-		for n, err = wr.Read(word); err == nil; n, err = wr.Read(word) {
-			if !yield(string(word[:n])) {
+func All() iter.Seq[int] {
+	return func(yield func(int) bool) {
+		for i := 0; i < 10; i++ {
+			growStack(512)
+			if !yield(i) {
 				return
 			}
 		}
-		if err != io.EOF {
-			fmt.Fprintf(os.Stderr, "error reading word: %v\n", err)
-		}
 	}
 }
 
-// removeNonAlphabetic removes non-alphabetic characters from a word using strings.Map
-func removeNonAlphabetic(word string) string {
-	return strings.Map(func(r rune) rune {
-		if unicode.IsLetter(r) {
-			return unicode.ToLower(r)
-		}
-		return -1
-	}, word)
+type S struct {
+	round int
 }
 
-// ProbabilisticSkipper determines if an item should be retained with probability 1/(1<>= 1
-	pr.counter--
-	if pr.counter == 0 {
-		pr.refreshCounter()
-	}
-	return remove
-}
-
-// EstimateUniqueWordsIter estimates the number of unique words using a probabilistic counting method
-func EstimateUniqueWordsIter(reader io.Reader, memorySize int) int {
-	wordReader := NewWordReader(reader)
-	words := make(map[string]struct{}, memorySize)
-
+func f() {
 	rounds := 0
-	roundRemover := NewProbabilisticSkipper(1)
-	wordSkipper := NewProbabilisticSkipper(rounds)
-	wordSkipper.check(rounds)
+	s := NewS(rounds)
+	s.check(rounds)
 
-	for word := range wordReader.All() {
-		wordSkipper.check(rounds)
-		if wordSkipper.ShouldSkip() {
-			delete(words, word)
-		} else {
-			words[word] = struct{}{}
-
-			if len(words) >= memorySize {
-				rounds++
-
-				wordSkipper = NewProbabilisticSkipper(rounds)
-				for w := range words {
-					if roundRemover.ShouldSkip() {
-						delete(words, w)
-					}
-				}
-			}
-		}
-		wordSkipper.check(rounds)
+	for range All() {
+		s.check(rounds)
+		rounds++
+		s = NewS(rounds)
+		s.check(rounds)
 	}
+}
 
-	if len(words) == 0 {
-		return 0
+func growStack(i int) {
+	if i == 0 {
+		return
 	}
-
-	invProbability := 1 << rounds
-	estimatedUniqueWords := len(words) * invProbability
-	return estimatedUniqueWords
+	growStack(i - 1)
 }
 
 func main() {
-	input := "Hello, world! This is a test. Hello, world, hello!"
-	expectedUniqueWords := 6 // "hello", "world", "this", "is", "a", "test" (but "hello" and "world" are repeated)
-	memorySize := 6
-
-	reader := strings.NewReader(input)
-	estimatedUniqueWords := EstimateUniqueWordsIter(reader, memorySize)
-	if estimatedUniqueWords != expectedUniqueWords {
-		// ...
-	}
+	f()
 }
diff --git a/test/fixedbugs/issue69825.go b/test/fixedbugs/issue69825.go
new file mode 100644
index 00000000..d3d3ec5e
--- /dev/null
+++ b/test/fixedbugs/issue69825.go
@@ -0,0 +1,18 @@
+// compile -d=libfuzzer
+
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+type T struct {
+	A
+}
+
+type A struct {
+}
+
+//go:noinline
+func (a *A) Foo(s [2]string) {
+}
diff --git a/test/fixedbugs/issue70156.go b/test/fixedbugs/issue70156.go
new file mode 100644
index 00000000..30a732a2
--- /dev/null
+++ b/test/fixedbugs/issue70156.go
@@ -0,0 +1,23 @@
+// run
+
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+import (
+	"reflect"
+)
+
+func main() {
+	pi := new(interface{})
+	v := reflect.ValueOf(pi).Elem()
+	if v.Kind() != reflect.Interface {
+		panic(0)
+	}
+	if (v.Kind() == reflect.Ptr || v.Kind() == reflect.Interface) && v.IsNil() {
+		return
+	}
+	panic(1)
+}
diff --git a/test/fixedbugs/issue70175.go b/test/fixedbugs/issue70175.go
new file mode 100644
index 00000000..0ad6e39a
--- /dev/null
+++ b/test/fixedbugs/issue70175.go
@@ -0,0 +1,17 @@
+// compile
+
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+func f() {
+_:
+
+_:
+}
+
+func main() {
+	f()
+}
diff --git a/test/fixedbugs/issue70189.go b/test/fixedbugs/issue70189.go
new file mode 100644
index 00000000..357ac537
--- /dev/null
+++ b/test/fixedbugs/issue70189.go
@@ -0,0 +1,38 @@
+// run -goexperiment noswissmap
+
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+func nan() float64 {
+	var x, y float64
+	return x / y
+}
+
+func main() {
+	m := map[float64]int{}
+
+	// Make a small map with nan keys
+	for i := 0; i < 8; i++ {
+		m[nan()] = i
+	}
+
+	// Start iterating on it.
+	start := true
+	for _, v := range m {
+		if start {
+			// Add some more elements.
+			for i := 0; i < 10; i++ {
+				m[float64(i)] = i
+			}
+			// Now clear the map.
+			clear(m)
+			start = false
+		} else {
+			// We should never reach here.
+			panic(v)
+		}
+	}
+}
diff --git a/test/fixedbugs/issue70481.go b/test/fixedbugs/issue70481.go
new file mode 100644
index 00000000..b73df851
--- /dev/null
+++ b/test/fixedbugs/issue70481.go
@@ -0,0 +1,20 @@
+// run
+
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+const maxUint64 = (1 << 64) - 1
+
+//go:noinline
+func f(n uint64) uint64 {
+	return maxUint64 - maxUint64%n
+}
+
+func main() {
+	for i := uint64(1); i < 20; i++ {
+		println(i, maxUint64-f(i))
+	}
+}
diff --git a/test/fixedbugs/issue70481.out b/test/fixedbugs/issue70481.out
new file mode 100644
index 00000000..bd41333d
--- /dev/null
+++ b/test/fixedbugs/issue70481.out
@@ -0,0 +1,19 @@
+1 0
+2 1
+3 0
+4 3
+5 0
+6 3
+7 1
+8 7
+9 6
+10 5
+11 4
+12 3
+13 2
+14 1
+15 0
+16 15
+17 0
+18 15
+19 16
diff --git a/test/fixedbugs/notinheap.go b/test/fixedbugs/notinheap.go
index 2188a38a..c94f2d6b 100644
--- a/test/fixedbugs/notinheap.go
+++ b/test/fixedbugs/notinheap.go
@@ -4,12 +4,15 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// Test type-checking errors for go:notinheap.
+// Test type-checking errors for not-in-heap types.
+
+//go:build cgo
 
 package p
 
-//go:notinheap
-type nih struct{}
+import "runtime/cgo"
+
+type nih struct{ _ cgo.Incomplete }
 
 type embed4 map[nih]int // ERROR "incomplete \(or unallocatable\) map key not allowed"
 
@@ -27,25 +30,8 @@ type okay4 interface {
 	f(x nih) nih
 }
 
-// Type conversions don't let you sneak past notinheap.
-
-type t1 struct{ x int }
-
-//go:notinheap
-type t2 t1
-
-//go:notinheap
-type t3 byte
-
-//go:notinheap
-type t4 rune
-
-var sink interface{}
-
-func i() {
-	sink = new(t1)                     // no error
-	sink = (*t2)(new(t1))              // ERROR "cannot convert(.|\n)*t2 is incomplete \(or unallocatable\)"
-	sink = (*t2)(new(struct{ x int })) // ERROR "cannot convert(.|\n)*t2 is incomplete \(or unallocatable\)"
-	sink = []t3("foo")                 // ERROR "cannot convert(.|\n)*t3 is incomplete \(or unallocatable\)"
-	sink = []t4("bar")                 // ERROR "cannot convert(.|\n)*t4 is incomplete \(or unallocatable\)"
+func f() {
+	type embed7 map[nih]int // ERROR "incomplete \(or unallocatable\) map key not allowed"
+	type embed8 map[int]nih // ERROR "incomplete \(or unallocatable\) map value not allowed"
+	type emebd9 chan nih    // ERROR "chan of incomplete \(or unallocatable\) type not allowed"
 }
diff --git a/test/func3.go b/test/func3.go
index 6be3bf01..861ab2cb 100644
--- a/test/func3.go
+++ b/test/func3.go
@@ -13,8 +13,8 @@ type t1 int
 type t2 int
 type t3 int
 
-func f1(*t2, x t3)	// ERROR "named"
-func f2(t1, *t2, x t3)	// ERROR "named"
-func f3() (x int, *string)	// ERROR "named"
+func f1(*t2, x t3)	// ERROR "missing parameter name"
+func f2(t1, *t2, x t3)	// ERROR "missing parameter name"
+func f3() (x int, *string)	// ERROR "missing parameter name"
 
 func f4() (t1 t1)	// legal - scope of parameter named t1 starts in body of f4.
diff --git a/test/fuse.go b/test/fuse.go
index e9205dcc..9366b218 100644
--- a/test/fuse.go
+++ b/test/fuse.go
@@ -148,11 +148,11 @@ func fEqInterEqInter(a interface{}, f float64) bool {
 }
 
 func fEqInterNeqInter(a interface{}, f float64) bool {
-	return a == nil && f > Cf2 || a != nil && f < -Cf2
+	return a == nil && f > Cf2 || a != nil && f < -Cf2 // ERROR "Redirect IsNonNil based on IsNonNil"
 }
 
 func fNeqInterEqInter(a interface{}, f float64) bool {
-	return a != nil && f > Cf2 || a == nil && f < -Cf2
+	return a != nil && f > Cf2 || a == nil && f < -Cf2 // ERROR "Redirect IsNonNil based on IsNonNil"
 }
 
 func fNeqInterNeqInter(a interface{}, f float64) bool {
@@ -164,11 +164,11 @@ func fEqSliceEqSlice(a []int, f float64) bool {
 }
 
 func fEqSliceNeqSlice(a []int, f float64) bool {
-	return a == nil && f > Cf2 || a != nil && f < -Cf2
+	return a == nil && f > Cf2 || a != nil && f < -Cf2 // ERROR "Redirect IsNonNil based on IsNonNil"
 }
 
 func fNeqSliceEqSlice(a []int, f float64) bool {
-	return a != nil && f > Cf2 || a == nil && f < -Cf2
+	return a != nil && f > Cf2 || a == nil && f < -Cf2 // ERROR "Redirect IsNonNil based on IsNonNil"
 }
 
 func fNeqSliceNeqSlice(a []int, f float64) bool {
diff --git a/test/initloop.go b/test/initloop.go
index b1a8470b..c4530f36 100644
--- a/test/initloop.go
+++ b/test/initloop.go
@@ -11,7 +11,7 @@ package main
 
 var (
 	x int = a
-	a int = b // ERROR "a refers to\n.*b refers to\n.*c refers to\n.*a|initialization loop"
+	a int = b // ERROR "a refers to b\n.*b refers to c\n.*c refers to a|initialization loop"
 	b int = c
 	c int = a
 )
diff --git a/test/inline.go b/test/inline.go
index fd14f259..4714c795 100644
--- a/test/inline.go
+++ b/test/inline.go
@@ -73,6 +73,7 @@ func l(x, y int) (int, int, error) { // ERROR "can inline l"
 		f := e
 		f(nil) // ERROR "inlining call to l.func1"
 	}
+	_ = e // prevent simple deadcode elimination after inlining
 	return y, x, nil
 }
 
@@ -109,6 +110,7 @@ func p() int { // ERROR "can inline p"
 
 func q(x int) int { // ERROR "can inline q"
 	foo := func() int { return x * 2 } // ERROR "can inline q.func1" "func literal does not escape"
+	_ = foo                            // prevent simple deadcode elimination after inlining
 	return foo()                       // ERROR "inlining call to q.func1"
 }
 
@@ -121,6 +123,8 @@ func r(z int) int {
 			return 2*y + x*z
 		}(x) // ERROR "inlining call to r.func2.1"
 	}
+	_, _ = foo, bar // prevent simple deadcode elimination after inlining
+
 	return foo(42) + bar(42) // ERROR "inlining call to r.func1" "inlining call to r.func2" "inlining call to r.r.func2.func3"
 }
 
@@ -128,7 +132,8 @@ func s0(x int) int { // ERROR "can inline s0"
 	foo := func() { // ERROR "can inline s0.func1" "func literal does not escape"
 		x = x + 1
 	}
-	foo() // ERROR "inlining call to s0.func1"
+	foo()   // ERROR "inlining call to s0.func1"
+	_ = foo // prevent simple deadcode elimination after inlining
 	return x
 }
 
@@ -137,6 +142,7 @@ func s1(x int) int { // ERROR "can inline s1"
 		return x
 	}
 	x = x + 1
+	_ = foo      // prevent simple deadcode elimination after inlining
 	return foo() // ERROR "inlining call to s1.func1"
 }
 
diff --git a/test/inline_testingbloop.go b/test/inline_testingbloop.go
new file mode 100644
index 00000000..cbdf9059
--- /dev/null
+++ b/test/inline_testingbloop.go
@@ -0,0 +1,37 @@
+// errorcheck -0 -m=2
+
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Test no inlining of function calls in testing.B.Loop.
+// See issue #61515.
+
+package foo
+
+import "testing"
+
+func caninline(x int) int { // ERROR "can inline caninline"
+	return x
+}
+
+func cannotinline(b *testing.B) { // ERROR "b does not escape" "cannot inline cannotinline.*"
+	for i := 0; i < b.N; i++ {
+		caninline(1) // ERROR "inlining call to caninline"
+	}
+	for b.Loop() { // ERROR "skip inlining within testing.B.loop" "inlining call to testing\.\(\*B\)\.Loop"
+		caninline(1)
+	}
+	for i := 0; i < b.N; i++ {
+		caninline(1) // ERROR "inlining call to caninline"
+	}
+	for b.Loop() { // ERROR "skip inlining within testing.B.loop" "inlining call to testing\.\(\*B\)\.Loop"
+		caninline(1)
+	}
+	for i := 0; i < b.N; i++ {
+		caninline(1) // ERROR "inlining call to caninline"
+	}
+	for b.Loop() { // ERROR "skip inlining within testing.B.loop" "inlining call to testing\.\(\*B\)\.Loop"
+		caninline(1)
+	}
+}
diff --git a/test/internal/runtime/sys/README b/test/internal/runtime/sys/README
new file mode 100644
index 00000000..919e0bb0
--- /dev/null
+++ b/test/internal/runtime/sys/README
@@ -0,0 +1,7 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+The internal/runtime/sys directory contains tests that specifically need to be
+compiled as-if in the internal/runtime/sys package. For error-check tests,
+these require the additional flags -+ and -p=internal/runtime/sys.
diff --git a/test/runtime/inlinegcpc.go b/test/internal/runtime/sys/inlinegcpc.go
similarity index 54%
rename from test/runtime/inlinegcpc.go
rename to test/internal/runtime/sys/inlinegcpc.go
index c423993b..7cadc639 100644
--- a/test/runtime/inlinegcpc.go
+++ b/test/internal/runtime/sys/inlinegcpc.go
@@ -1,19 +1,19 @@
-// errorcheck -0 -+ -p=runtime -m
+// errorcheck -0 -+ -p=internal/runtime/sys -m
 
-// Copyright 2019 The Go Authors. All rights reserved.
+// Copyright 2024 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-package runtime
+package sys
 
-// A function that calls runtime.getcallerpc or runtime.getcallersp()
+// A function that calls sys.GetCallerPC or sys.GetCallerSP
 // cannot be inlined, no matter how small it is.
 
-func getcallerpc() uintptr
-func getcallersp() uintptr
+func GetCallerPC() uintptr
+func GetCallerSP() uintptr
 
 func pc() uintptr {
-	return getcallerpc() + 1
+	return GetCallerPC() + 1
 }
 
 func cpc() uintptr { // ERROR "can inline cpc"
@@ -21,7 +21,7 @@ func cpc() uintptr { // ERROR "can inline cpc"
 }
 
 func sp() uintptr {
-	return getcallersp() + 3
+	return GetCallerSP() + 3
 }
 
 func csp() uintptr { // ERROR "can inline csp"
diff --git a/test/intrinsic.dir/main.go b/test/intrinsic.dir/main.go
index 951aa159..21e3eff8 100644
--- a/test/intrinsic.dir/main.go
+++ b/test/intrinsic.dir/main.go
@@ -6,7 +6,7 @@ package main
 
 import (
 	"fmt"
-	T "runtime/internal/sys"
+	T "internal/runtime/sys"
 )
 
 var A = []uint64{0x0102030405060708, 0x1122334455667788}
diff --git a/test/live.go b/test/live.go
index 5658c8ba..c0b0fcd2 100644
--- a/test/live.go
+++ b/test/live.go
@@ -458,14 +458,14 @@ func f28(b bool) {
 
 func f29(b bool) {
 	if b {
-		for k := range m { // ERROR "live at call to mapiterinit: .autotmp_[0-9]+$" "live at call to mapiternext: .autotmp_[0-9]+$" "stack object .autotmp_[0-9]+ runtime.hiter$"
+		for k := range m { // ERROR "live at call to (mapiterinit|mapIterStart): .autotmp_[0-9]+$" "live at call to (mapiternext|mapIterNext): .autotmp_[0-9]+$" "stack object .autotmp_[0-9]+ (runtime.hiter|internal/runtime/maps.Iter)$"
 			printstring(k) // ERROR "live at call to printstring: .autotmp_[0-9]+$"
 		}
 	}
-	for k := range m { // ERROR "live at call to mapiterinit: .autotmp_[0-9]+$" "live at call to mapiternext: .autotmp_[0-9]+$"
+	for k := range m { // ERROR "live at call to (mapiterinit|mapIterStart): .autotmp_[0-9]+$" "live at call to (mapiternext|mapIterNext): .autotmp_[0-9]+$"
 		printstring(k) // ERROR "live at call to printstring: .autotmp_[0-9]+$"
 	}
-	for k := range m { // ERROR "live at call to mapiterinit: .autotmp_[0-9]+$" "live at call to mapiternext: .autotmp_[0-9]+$"
+	for k := range m { // ERROR "live at call to (mapiterinit|mapIterStart): .autotmp_[0-9]+$" "live at call to (mapiternext|mapIterNext): .autotmp_[0-9]+$"
 		printstring(k) // ERROR "live at call to printstring: .autotmp_[0-9]+$"
 	}
 }
@@ -659,15 +659,9 @@ func newT40() *T40 {
 	return &ret
 }
 
-func bad40() {
-	t := newT40()
-	_ = t
-	printnl()
-}
-
 func good40() {
 	ret := T40{}              // ERROR "stack object ret T40$"
-	ret.m = make(map[int]int) // ERROR "live at call to rand32: .autotmp_[0-9]+$" "stack object .autotmp_[0-9]+ runtime.hmap$"
+	ret.m = make(map[int]int) // ERROR "live at call to rand(32)?: .autotmp_[0-9]+$" "stack object .autotmp_[0-9]+ (runtime.hmap|internal/runtime/maps.Map)$"
 	t := &ret
 	printnl() // ERROR "live at call to printnl: ret$"
 	// Note: ret is live at the printnl because the compiler moves &ret
@@ -675,6 +669,12 @@ func good40() {
 	useT40(t)
 }
 
+func bad40() {
+	t := newT40()
+	_ = t
+	printnl()
+}
+
 func ddd1(x, y *int) { // ERROR "live at entry to ddd1: x y$"
 	ddd2(x, y) // ERROR "stack object .autotmp_[0-9]+ \[2\]\*int$"
 	printnl()
diff --git a/test/live2.go b/test/live2.go
index 2beac4f8..313caa6f 100644
--- a/test/live2.go
+++ b/test/live2.go
@@ -27,14 +27,14 @@ func newT40() *T40 {
 }
 
 func bad40() {
-	t := newT40() // ERROR "stack object ret T40$" "stack object .autotmp_[0-9]+ runtime.hmap$"
+	t := newT40() // ERROR "stack object ret T40$" "stack object .autotmp_[0-9]+ (runtime.hmap|internal/runtime/maps.Map)$"
 	printnl()     // ERROR "live at call to printnl: ret$"
 	useT40(t)
 }
 
 func good40() {
 	ret := T40{}                  // ERROR "stack object ret T40$"
-	ret.m = make(map[int]int, 42) // ERROR "stack object .autotmp_[0-9]+ runtime.hmap$"
+	ret.m = make(map[int]int, 42) // ERROR "stack object .autotmp_[0-9]+ (runtime.hmap|internal/runtime/maps.Map)$"
 	t := &ret
 	printnl() // ERROR "live at call to printnl: ret$"
 	useT40(t)
diff --git a/test/live_regabi.go b/test/live_regabi.go
index a335126b..35f874ec 100644
--- a/test/live_regabi.go
+++ b/test/live_regabi.go
@@ -278,6 +278,7 @@ func f17b(p *byte) { // ERROR "live at entry to f17b: p$"
 	// key temporary
 	if b {
 		m2s[str()] = p // ERROR "live at call to mapassign_faststr: p$" "live at call to str: p$"
+
 	}
 	m2s[str()] = p // ERROR "live at call to mapassign_faststr: p$" "live at call to str: p$"
 	m2s[str()] = p // ERROR "live at call to mapassign_faststr: p$" "live at call to str: p$"
@@ -455,14 +456,14 @@ func f28(b bool) {
 
 func f29(b bool) {
 	if b {
-		for k := range m { // ERROR "live at call to mapiterinit: .autotmp_[0-9]+$" "live at call to mapiternext: .autotmp_[0-9]+$" "stack object .autotmp_[0-9]+ runtime.hiter$"
+		for k := range m { // ERROR "live at call to (mapiterinit|mapIterStart): .autotmp_[0-9]+$" "live at call to (mapiternext|mapIterNext): .autotmp_[0-9]+$" "stack object .autotmp_[0-9]+ (runtime.hiter|internal/runtime/maps.Iter)$"
 			printstring(k) // ERROR "live at call to printstring: .autotmp_[0-9]+$"
 		}
 	}
-	for k := range m { // ERROR "live at call to mapiterinit: .autotmp_[0-9]+$" "live at call to mapiternext: .autotmp_[0-9]+$"
+	for k := range m { // ERROR "live at call to (mapiterinit|mapIterStart): .autotmp_[0-9]+$" "live at call to (mapiternext|mapIterNext): .autotmp_[0-9]+$"
 		printstring(k) // ERROR "live at call to printstring: .autotmp_[0-9]+$"
 	}
-	for k := range m { // ERROR "live at call to mapiterinit: .autotmp_[0-9]+$" "live at call to mapiternext: .autotmp_[0-9]+$"
+	for k := range m { // ERROR "live at call to (mapiterinit|mapIterStart): .autotmp_[0-9]+$" "live at call to (mapiternext|mapIterNext): .autotmp_[0-9]+$"
 		printstring(k) // ERROR "live at call to printstring: .autotmp_[0-9]+$"
 	}
 }
@@ -656,15 +657,9 @@ func newT40() *T40 {
 	return &ret
 }
 
-func bad40() {
-	t := newT40()
-	_ = t
-	printnl()
-}
-
 func good40() {
 	ret := T40{}              // ERROR "stack object ret T40$"
-	ret.m = make(map[int]int) // ERROR "live at call to rand32: .autotmp_[0-9]+$" "stack object .autotmp_[0-9]+ runtime.hmap$"
+	ret.m = make(map[int]int) // ERROR "live at call to rand(32)?: .autotmp_[0-9]+$" "stack object .autotmp_[0-9]+ (runtime.hmap|internal/runtime/maps.Map)$"
 	t := &ret
 	printnl() // ERROR "live at call to printnl: ret$"
 	// Note: ret is live at the printnl because the compiler moves &ret
@@ -672,6 +667,12 @@ func good40() {
 	useT40(t)
 }
 
+func bad40() {
+	t := newT40()
+	_ = t
+	printnl()
+}
+
 func ddd1(x, y *int) { // ERROR "live at entry to ddd1: x y$"
 	ddd2(x, y) // ERROR "stack object .autotmp_[0-9]+ \[2\]\*int$"
 	printnl()
diff --git a/test/loopbce.go b/test/loopbce.go
index 04c186be..2d5c965a 100644
--- a/test/loopbce.go
+++ b/test/loopbce.go
@@ -27,7 +27,7 @@ func f0c(a []int) int {
 	x := 0
 	for i := range a { // ERROR "Induction variable: limits \[0,\?\), increment 1$"
 		b := a[:i+1] // ERROR "(\([0-9]+\) )?Proved IsSliceInBounds$"
-		x += b[0]
+		x += b[0]    // ERROR "(\([0-9]+\) )?Proved IsInBounds$"
 	}
 	return x
 }
@@ -168,7 +168,7 @@ func g2() int {
 func g3a() {
 	a := "this string has length 25"
 	for i := 0; i < len(a); i += 5 { // ERROR "Induction variable: limits \[0,20\], increment 5$"
-		useString(a[i:]) // ERROR "(\([0-9]+\) )?Proved IsSliceInBounds$"
+		useString(a[i:])   // ERROR "(\([0-9]+\) )?Proved IsSliceInBounds$"
 		useString(a[:i+3]) // ERROR "(\([0-9]+\) )?Proved IsSliceInBounds$"
 		useString(a[:i+5]) // ERROR "(\([0-9]+\) )?Proved IsSliceInBounds$"
 		useString(a[:i+6])
@@ -294,8 +294,10 @@ func k3neg2(a [100]int) [100]int {
 }
 
 func k4(a [100]int) [100]int {
-	min := (-1) << 63
-	for i := min; i < min+50; i++ { // ERROR "Induction variable: limits \[-9223372036854775808,-9223372036854775758\), increment 1$"
+	// Note: can't use (-1)<<63 here, because i-min doesn't get rewritten to i+(-min),
+	// and it isn't worth adding that special case to prove.
+	min := (-1)<<63 + 1
+	for i := min; i < min+50; i++ { // ERROR "Induction variable: limits \[-9223372036854775807,-9223372036854775757\), increment 1$"
 		a[i-min] = i // ERROR "(\([0-9]+\) )?Proved IsInBounds$"
 	}
 	return a
@@ -314,7 +316,7 @@ func d1(a [100]int) [100]int {
 	for i := 0; i < 100; i++ { // ERROR "Induction variable: limits \[0,100\), increment 1$"
 		for j := 0; j < i; j++ { // ERROR "Induction variable: limits \[0,\?\), increment 1$"
 			a[j] = 0   // ERROR "Proved IsInBounds$"
-			a[j+1] = 0 // FIXME: this boundcheck should be eliminated
+			a[j+1] = 0 // ERROR "Proved IsInBounds$"
 			a[j+2] = 0
 		}
 	}
@@ -325,7 +327,7 @@ func d2(a [100]int) [100]int {
 	for i := 0; i < 100; i++ { // ERROR "Induction variable: limits \[0,100\), increment 1$"
 		for j := 0; i > j; j++ { // ERROR "Induction variable: limits \[0,\?\), increment 1$"
 			a[j] = 0   // ERROR "Proved IsInBounds$"
-			a[j+1] = 0 // FIXME: this boundcheck should be eliminated
+			a[j+1] = 0 // ERROR "Proved IsInBounds$"
 			a[j+2] = 0
 		}
 	}
@@ -419,12 +421,12 @@ func nobce2(a string) {
 	for i := int64(0); i < int64(len(a))-31337; i++ { // ERROR "Induction variable: limits \[0,\?\), increment 1$"
 		useString(a[i:]) // ERROR "(\([0-9]+\) )?Proved IsSliceInBounds$"
 	}
-	for i := int64(0); i < int64(len(a))+int64(-1<<63); i++ { // ERROR "Induction variable: limits \[0,\?\), increment 1$"
-		useString(a[i:]) // ERROR "(\([0-9]+\) )?Proved IsSliceInBounds$"
+	for i := int64(0); i < int64(len(a))+int64(-1<<63); i++ { // ERROR "Induction variable: limits \[0,\?\), increment 1$" "Disproved Less64"
+		useString(a[i:])
 	}
 	j := int64(len(a)) - 123
-	for i := int64(0); i < j+123+int64(-1<<63); i++ { // ERROR "Induction variable: limits \[0,\?\), increment 1$"
-		useString(a[i:]) // ERROR "(\([0-9]+\) )?Proved IsSliceInBounds$"
+	for i := int64(0); i < j+123+int64(-1<<63); i++ { // ERROR "Induction variable: limits \[0,\?\), increment 1$" "Disproved Less64"
+		useString(a[i:])
 	}
 	for i := int64(0); i < j+122+int64(-1<<63); i++ { // ERROR "Induction variable: limits \[0,\?\), increment 1$"
 		// len(a)-123+122+MinInt overflows when len(a) == 0, so a bound check is needed here
diff --git a/test/newinline.go b/test/newinline.go
index 69f1310a..a7288691 100644
--- a/test/newinline.go
+++ b/test/newinline.go
@@ -73,6 +73,7 @@ func l(x, y int) (int, int, error) { // ERROR "can inline l"
 		f := e
 		f(nil) // ERROR "inlining call to l.func1"
 	}
+	_ = e // prevent simple deadcode elimination
 	return y, x, nil
 }
 
@@ -109,6 +110,7 @@ func p() int { // ERROR "can inline p"
 
 func q(x int) int { // ERROR "can inline q"
 	foo := func() int { return x * 2 } // ERROR "can inline q.func1" "func literal does not escape"
+	_ = foo                            // prevent simple deadcode elimination
 	return foo()                       // ERROR "inlining call to q.func1"
 }
 
@@ -121,6 +123,8 @@ func r(z int) int { // ERROR "can inline r"
 			return 2*y + x*z
 		}(x) // ERROR "inlining call to r.func2.1"
 	}
+	_ = foo                  // prevent simple deadcode elimination
+	_ = bar                  // prevent simple deadcode elimination
 	return foo(42) + bar(42) // ERROR "inlining call to r.func1" "inlining call to r.func2" "inlining call to r.r.func2.func3"
 }
 
@@ -128,7 +132,8 @@ func s0(x int) int { // ERROR "can inline s0"
 	foo := func() { // ERROR "can inline s0.func1" "func literal does not escape"
 		x = x + 1
 	}
-	foo() // ERROR "inlining call to s0.func1"
+	foo()   // ERROR "inlining call to s0.func1"
+	_ = foo // prevent simple deadcode elimination
 	return x
 }
 
@@ -137,6 +142,7 @@ func s1(x int) int { // ERROR "can inline s1"
 		return x
 	}
 	x = x + 1
+	_ = foo      // prevent simple deadcode elimination
 	return foo() // ERROR "inlining call to s1.func1"
 }
 
diff --git a/test/nosplit.go b/test/nosplit.go
index e171d1da..4b4c93b1 100644
--- a/test/nosplit.go
+++ b/test/nosplit.go
@@ -1,6 +1,6 @@
 // run
 
-//go:build !nacl && !js && !aix && !wasip1 && !gcflags_noopt && gc
+//go:build !nacl && !js && !aix && !openbsd && !wasip1 && !gcflags_noopt && gc
 
 // Copyright 2014 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
diff --git a/test/prove.go b/test/prove.go
index 0d93db90..edfd8908 100644
--- a/test/prove.go
+++ b/test/prove.go
@@ -8,7 +8,10 @@
 
 package main
 
-import "math"
+import (
+	"math"
+	"math/bits"
+)
 
 func f0(a []int) int {
 	a[0] = 1
@@ -400,8 +403,8 @@ func f13f(a, b int64) int64 {
 	if b != math.MaxInt64 {
 		return 42
 	}
-	if a > b {
-		if a == 0 { // ERROR "Disproved Eq64$"
+	if a > b { // ERROR "Disproved Less64$"
+		if a == 0 {
 			return 1
 		}
 	}
@@ -684,20 +687,6 @@ func constsuffix(s string) bool {
 	return suffix(s, "abc") // ERROR "Proved IsSliceInBounds$"
 }
 
-// oforuntil tests the pattern created by OFORUNTIL blocks. These are
-// handled by addLocalInductiveFacts rather than findIndVar.
-func oforuntil(b []int) {
-	i := 0
-	if len(b) > i {
-	top:
-		println(b[i]) // ERROR "Induction variable: limits \[0,\?\), increment 1$" "Proved IsInBounds$"
-		i++
-		if i < len(b) {
-			goto top
-		}
-	}
-}
-
 func atexit(foobar []func()) {
 	for i := len(foobar) - 1; i >= 0; i-- { // ERROR "Induction variable: limits \[0,\?\], increment 1"
 		f := foobar[i]
@@ -877,11 +866,11 @@ func unrollDecMin(a []int, b int) int {
 		return 42
 	}
 	var i, x int
-	for i = len(a); i >= b; i -= 2 {
+	for i = len(a); i >= b; i -= 2 { // ERROR "Proved Leq64"
 		x += a[i-1]
 		x += a[i-2]
 	}
-	if i == 1 { // ERROR "Disproved Eq64$"
+	if i == 1 {
 		x += a[i-1]
 	}
 	return x
@@ -893,11 +882,11 @@ func unrollIncMin(a []int, b int) int {
 		return 42
 	}
 	var i, x int
-	for i = len(a); i >= b; i += 2 {
+	for i = len(a); i >= b; i += 2 { // ERROR "Proved Leq64"
 		x += a[i-1]
 		x += a[i-2]
 	}
-	if i == 1 { // ERROR "Disproved Eq64$"
+	if i == 1 {
 		x += a[i-1]
 	}
 	return x
@@ -1107,7 +1096,7 @@ func modu2(x, y uint) int {
 
 func issue57077(s []int) (left, right []int) {
 	middle := len(s) / 2
-	left = s[:middle] // ERROR "Proved IsSliceInBounds$"
+	left = s[:middle]  // ERROR "Proved IsSliceInBounds$"
 	right = s[middle:] // ERROR "Proved IsSliceInBounds$"
 	return
 }
@@ -1124,6 +1113,605 @@ func issue45928(x int) {
 	useInt(combinedFrac)
 }
 
+func constantBounds1(i, j uint) int {
+	var a [10]int
+	if j < 11 && i < j {
+		return a[i] // ERROR "Proved IsInBounds$"
+	}
+	return 0
+}
+
+func constantBounds2(i, j uint) int {
+	var a [10]int
+	if i < j && j < 11 {
+		return a[i] // ERROR "Proved IsInBounds"
+	}
+	return 0
+}
+
+func constantBounds3(i, j, k, l uint) int {
+	var a [8]int
+	if i < j && j < k && k < l && l < 11 {
+		return a[i] // ERROR "Proved IsInBounds"
+	}
+	return 0
+}
+
+func equalityPropagation(a [1]int, i, j uint) int {
+	if i == j && i == 5 {
+		return a[j-5] // ERROR "Proved IsInBounds"
+	}
+	return 0
+}
+func inequalityPropagation(a [1]int, i, j uint) int {
+	if i != j && j >= 5 && j <= 6 && i == 5 {
+		return a[j-6] // ERROR "Proved IsInBounds"
+	}
+	return 0
+}
+
+func issue66826a(a [21]byte) {
+	for i := 0; i <= 10; i++ { // ERROR "Induction variable: limits \[0,10\], increment 1$"
+		_ = a[2*i] // ERROR "Proved IsInBounds"
+	}
+}
+func issue66826b(a [31]byte, i int) {
+	if i < 0 || i > 10 {
+		return
+	}
+	_ = a[3*i] // ERROR "Proved IsInBounds"
+}
+
+func f20(a, b bool) int {
+	if a == b {
+		if a {
+			if b { // ERROR "Proved Arg"
+				return 1
+			}
+		}
+	}
+	return 0
+}
+
+func f21(a, b *int) int {
+	if a == b {
+		if a != nil {
+			if b != nil { // ERROR "Proved IsNonNil"
+				return 1
+			}
+		}
+	}
+	return 0
+}
+
+func f22(b bool, x, y int) int {
+	b2 := x < y
+	if b == b2 {
+		if b {
+			if x >= y { // ERROR "Disproved Leq64$"
+				return 1
+			}
+		}
+	}
+	return 0
+}
+
+func ctz64(x uint64, ensureBothBranchesCouldHappen bool) int {
+	const max = math.MaxUint64
+	sz := bits.Len64(max)
+
+	log2half := uint64(max) >> (sz / 2)
+	if x >= log2half || x == 0 {
+		return 42
+	}
+
+	y := bits.TrailingZeros64(x) // ERROR "Proved Ctz64 non-zero$""
+
+	z := sz / 2
+	if ensureBothBranchesCouldHappen {
+		if y < z { // ERROR "Proved Less64$"
+			return -42
+		}
+	} else {
+		if y >= z { // ERROR "Disproved Leq64$"
+			return 1337
+		}
+	}
+
+	return y
+}
+func ctz32(x uint32, ensureBothBranchesCouldHappen bool) int {
+	const max = math.MaxUint32
+	sz := bits.Len32(max)
+
+	log2half := uint32(max) >> (sz / 2)
+	if x >= log2half || x == 0 {
+		return 42
+	}
+
+	y := bits.TrailingZeros32(x) // ERROR "Proved Ctz32 non-zero$""
+
+	z := sz / 2
+	if ensureBothBranchesCouldHappen {
+		if y < z { // ERROR "Proved Less64$"
+			return -42
+		}
+	} else {
+		if y >= z { // ERROR "Disproved Leq64$"
+			return 1337
+		}
+	}
+
+	return y
+}
+func ctz16(x uint16, ensureBothBranchesCouldHappen bool) int {
+	const max = math.MaxUint16
+	sz := bits.Len16(max)
+
+	log2half := uint16(max) >> (sz / 2)
+	if x >= log2half || x == 0 {
+		return 42
+	}
+
+	y := bits.TrailingZeros16(x) // ERROR "Proved Ctz16 non-zero$""
+
+	z := sz / 2
+	if ensureBothBranchesCouldHappen {
+		if y < z { // ERROR "Proved Less64$"
+			return -42
+		}
+	} else {
+		if y >= z { // ERROR "Disproved Leq64$"
+			return 1337
+		}
+	}
+
+	return y
+}
+func ctz8(x uint8, ensureBothBranchesCouldHappen bool) int {
+	const max = math.MaxUint8
+	sz := bits.Len8(max)
+
+	log2half := uint8(max) >> (sz / 2)
+	if x >= log2half || x == 0 {
+		return 42
+	}
+
+	y := bits.TrailingZeros8(x) // ERROR "Proved Ctz8 non-zero$""
+
+	z := sz / 2
+	if ensureBothBranchesCouldHappen {
+		if y < z { // ERROR "Proved Less64$"
+			return -42
+		}
+	} else {
+		if y >= z { // ERROR "Disproved Leq64$"
+			return 1337
+		}
+	}
+
+	return y
+}
+
+func bitLen64(x uint64, ensureBothBranchesCouldHappen bool) int {
+	const max = math.MaxUint64
+	sz := bits.Len64(max)
+
+	if x >= max>>3 {
+		return 42
+	}
+	if x <= max>>6 {
+		return 42
+	}
+
+	y := bits.Len64(x)
+
+	if ensureBothBranchesCouldHappen {
+		if sz-6 <= y && y <= sz-3 { // ERROR "Proved Leq64$"
+			return -42
+		}
+	} else {
+		if y < sz-6 || sz-3 < y { // ERROR "Disproved Less64$"
+			return 1337
+		}
+	}
+	return y
+}
+func bitLen32(x uint32, ensureBothBranchesCouldHappen bool) int {
+	const max = math.MaxUint32
+	sz := bits.Len32(max)
+
+	if x >= max>>3 {
+		return 42
+	}
+	if x <= max>>6 {
+		return 42
+	}
+
+	y := bits.Len32(x)
+
+	if ensureBothBranchesCouldHappen {
+		if sz-6 <= y && y <= sz-3 { // ERROR "Proved Leq64$"
+			return -42
+		}
+	} else {
+		if y < sz-6 || sz-3 < y { // ERROR "Disproved Less64$"
+			return 1337
+		}
+	}
+	return y
+}
+func bitLen16(x uint16, ensureBothBranchesCouldHappen bool) int {
+	const max = math.MaxUint16
+	sz := bits.Len16(max)
+
+	if x >= max>>3 {
+		return 42
+	}
+	if x <= max>>6 {
+		return 42
+	}
+
+	y := bits.Len16(x)
+
+	if ensureBothBranchesCouldHappen {
+		if sz-6 <= y && y <= sz-3 { // ERROR "Proved Leq64$"
+			return -42
+		}
+	} else {
+		if y < sz-6 || sz-3 < y { // ERROR "Disproved Less64$"
+			return 1337
+		}
+	}
+	return y
+}
+func bitLen8(x uint8, ensureBothBranchesCouldHappen bool) int {
+	const max = math.MaxUint8
+	sz := bits.Len8(max)
+
+	if x >= max>>3 {
+		return 42
+	}
+	if x <= max>>6 {
+		return 42
+	}
+
+	y := bits.Len8(x)
+
+	if ensureBothBranchesCouldHappen {
+		if sz-6 <= y && y <= sz-3 { // ERROR "Proved Leq64$"
+			return -42
+		}
+	} else {
+		if y < sz-6 || sz-3 < y { // ERROR "Disproved Less64$"
+			return 1337
+		}
+	}
+	return y
+}
+
+func xor64(a, b uint64, ensureBothBranchesCouldHappen bool) int {
+	a &= 0xff
+	b &= 0xfff
+
+	z := a ^ b
+
+	if ensureBothBranchesCouldHappen {
+		if z > 0xfff { // ERROR "Disproved Less64U$"
+			return 42
+		}
+	} else {
+		if z <= 0xfff { // ERROR "Proved Leq64U$"
+			return 1337
+		}
+	}
+	return int(z)
+}
+
+func or64(a, b uint64, ensureBothBranchesCouldHappen bool) int {
+	a &= 0xff
+	b &= 0xfff
+
+	z := a | b
+
+	if ensureBothBranchesCouldHappen {
+		if z > 0xfff { // ERROR "Disproved Less64U$"
+			return 42
+		}
+	} else {
+		if z <= 0xfff { // ERROR "Proved Leq64U$"
+			return 1337
+		}
+	}
+	return int(z)
+}
+
+func mod64uWithSmallerDividendMax(a, b uint64, ensureBothBranchesCouldHappen bool) int {
+	a &= 0xff
+	b &= 0xfff
+
+	z := bits.Len64(a % b) // see go.dev/issue/68857 for bits.Len64
+
+	if ensureBothBranchesCouldHappen {
+		if z > bits.Len64(0xff) { // ERROR "Disproved Less64$"
+			return 42
+		}
+	} else {
+		if z <= bits.Len64(0xff) { // ERROR "Proved Leq64$"
+			return 1337
+		}
+	}
+	return z
+}
+func mod64uWithSmallerDivisorMax(a, b uint64, ensureBothBranchesCouldHappen bool) int {
+	a &= 0xfff
+	b &= 0x10 // we need bits.Len64(b.umax) != bits.Len64(b.umax-1)
+
+	z := bits.Len64(a % b) // see go.dev/issue/68857 for bits.Len64
+
+	if ensureBothBranchesCouldHappen {
+		if z > bits.Len64(0x10-1) { // ERROR "Disproved Less64$"
+			return 42
+		}
+	} else {
+		if z <= bits.Len64(0x10-1) { // ERROR "Proved Leq64$"
+			return 1337
+		}
+	}
+	return z
+}
+func mod64uWithIdenticalMax(a, b uint64, ensureBothBranchesCouldHappen bool) int {
+	a &= 0x10
+	b &= 0x10 // we need bits.Len64(b.umax) != bits.Len64(b.umax-1)
+
+	z := bits.Len64(a % b) // see go.dev/issue/68857 for bits.Len64
+
+	if ensureBothBranchesCouldHappen {
+		if z > bits.Len64(0x10-1) { // ERROR "Disproved Less64$"
+			return 42
+		}
+	} else {
+		if z <= bits.Len64(0x10-1) { // ERROR "Proved Leq64$"
+			return 1337
+		}
+	}
+	return z
+}
+func mod64sPositiveWithSmallerDividendMax(a, b int64, ensureBothBranchesCouldHappen bool) int64 {
+	if a < 0 || b < 0 {
+		return 42
+	}
+	a &= 0xff
+	b &= 0xfff
+
+	z := a % b // ERROR "Proved Mod64 does not need fix-up$"
+
+	if ensureBothBranchesCouldHappen {
+		if z > 0xff { // ERROR "Disproved Less64$"
+			return 42
+		}
+	} else {
+		if z <= 0xff { // ERROR "Proved Leq64$"
+			return 1337
+		}
+	}
+	return z
+}
+func mod64sPositiveWithSmallerDivisorMax(a, b int64, ensureBothBranchesCouldHappen bool) int64 {
+	if a < 0 || b < 0 {
+		return 42
+	}
+	a &= 0xfff
+	b &= 0xff
+
+	z := a % b // ERROR "Proved Mod64 does not need fix-up$"
+
+	if ensureBothBranchesCouldHappen {
+		if z > 0xff-1 { // ERROR "Disproved Less64$"
+			return 42
+		}
+	} else {
+		if z <= 0xff-1 { // ERROR "Proved Leq64$"
+			return 1337
+		}
+	}
+	return z
+}
+func mod64sPositiveWithIdenticalMax(a, b int64, ensureBothBranchesCouldHappen bool) int64 {
+	if a < 0 || b < 0 {
+		return 42
+	}
+	a &= 0xfff
+	b &= 0xfff
+
+	z := a % b // ERROR "Proved Mod64 does not need fix-up$"
+
+	if ensureBothBranchesCouldHappen {
+		if z > 0xfff-1 { // ERROR "Disproved Less64$"
+			return 42
+		}
+	} else {
+		if z <= 0xfff-1 { // ERROR "Proved Leq64$"
+			return 1337
+		}
+	}
+	return z
+}
+
+func div64u(a, b uint64, ensureAllBranchesCouldHappen func() bool) uint64 {
+	a &= 0xffff
+	a |= 0xfff
+	b &= 0xff
+	b |= 0xf
+
+	z := a / b // ERROR "Proved Neq64$"
+
+	if ensureAllBranchesCouldHappen() && z > 0xffff/0xf { // ERROR "Disproved Less64U$"
+		return 42
+	}
+	if ensureAllBranchesCouldHappen() && z <= 0xffff/0xf { // ERROR "Proved Leq64U$"
+		return 1337
+	}
+	if ensureAllBranchesCouldHappen() && z < 0xfff/0xff { // ERROR "Disproved Less64U$"
+		return 42
+	}
+	if ensureAllBranchesCouldHappen() && z >= 0xfff/0xff { // ERROR "Proved Leq64U$"
+		return 42
+	}
+	return z
+}
+func div64s(a, b int64, ensureAllBranchesCouldHappen func() bool) int64 {
+	if a < 0 || b < 0 {
+		return 42
+	}
+	a &= 0xffff
+	a |= 0xfff
+	b &= 0xff
+	b |= 0xf
+
+	z := a / b // ERROR "(Proved Div64 does not need fix-up|Proved Neq64)$"
+
+	if ensureAllBranchesCouldHappen() && z > 0xffff/0xf { // ERROR "Disproved Less64$"
+		return 42
+	}
+	if ensureAllBranchesCouldHappen() && z <= 0xffff/0xf { // ERROR "Proved Leq64$"
+		return 1337
+	}
+	if ensureAllBranchesCouldHappen() && z < 0xfff/0xff { // ERROR "Disproved Less64$"
+		return 42
+	}
+	if ensureAllBranchesCouldHappen() && z >= 0xfff/0xff { // ERROR "Proved Leq64$"
+		return 42
+	}
+	return z
+}
+
+func trunc64to16(a uint64, ensureAllBranchesCouldHappen func() bool) uint16 {
+	a &= 0xfff
+	a |= 0xff
+
+	z := uint16(a)
+	if ensureAllBranchesCouldHappen() && z > 0xfff { // ERROR "Disproved Less16U$"
+		return 42
+	}
+	if ensureAllBranchesCouldHappen() && z <= 0xfff { // ERROR "Proved Leq16U$"
+		return 1337
+	}
+	if ensureAllBranchesCouldHappen() && z < 0xff { // ERROR "Disproved Less16U$"
+		return 42
+	}
+	if ensureAllBranchesCouldHappen() && z >= 0xff { // ERROR "Proved Leq16U$"
+		return 1337
+	}
+	return z
+}
+
+func com64(a uint64, ensureAllBranchesCouldHappen func() bool) uint64 {
+	a &= 0xffff
+	a |= 0xff
+
+	z := ^a
+
+	if ensureAllBranchesCouldHappen() && z > ^uint64(0xff) { // ERROR "Disproved Less64U$"
+		return 42
+	}
+	if ensureAllBranchesCouldHappen() && z <= ^uint64(0xff) { // ERROR "Proved Leq64U$"
+		return 1337
+	}
+	if ensureAllBranchesCouldHappen() && z < ^uint64(0xffff) { // ERROR "Disproved Less64U$"
+		return 42
+	}
+	if ensureAllBranchesCouldHappen() && z >= ^uint64(0xffff) { // ERROR "Proved Leq64U$"
+		return 1337
+	}
+	return z
+}
+
+func neg64(a uint64, ensureAllBranchesCouldHappen func() bool) uint64 {
+	var lo, hi uint64 = 0xff, 0xfff
+	a &= hi
+	a |= lo
+
+	z := -a
+
+	if ensureAllBranchesCouldHappen() && z > -lo { // ERROR "Disproved Less64U$"
+		return 42
+	}
+	if ensureAllBranchesCouldHappen() && z <= -lo { // ERROR "Proved Leq64U$"
+		return 1337
+	}
+	if ensureAllBranchesCouldHappen() && z < -hi { // ERROR "Disproved Less64U$"
+		return 42
+	}
+	if ensureAllBranchesCouldHappen() && z >= -hi { // ERROR "Proved Leq64U$"
+		return 1337
+	}
+	return z
+}
+func neg64mightOverflowDuringNeg(a uint64, ensureAllBranchesCouldHappen func() bool) uint64 {
+	var lo, hi uint64 = 0, 0xfff
+	a &= hi
+	a |= lo
+
+	z := -a
+
+	if ensureAllBranchesCouldHappen() && z > -lo {
+		return 42
+	}
+	if ensureAllBranchesCouldHappen() && z <= -lo {
+		return 1337
+	}
+	if ensureAllBranchesCouldHappen() && z < -hi {
+		return 42
+	}
+	if ensureAllBranchesCouldHappen() && z >= -hi {
+		return 1337
+	}
+	return z
+}
+
+func phiMin(a, b []byte) {
+	_ = a[:min(len(a), len(b))] // ERROR "Proved IsSliceInBounds"
+	_ = b[:min(len(a), len(b))] // ERROR "Proved IsSliceInBounds"
+	_ = a[:max(len(a), len(b))]
+	_ = b[:max(len(a), len(b))]
+	x := len(a)
+	if x > len(b) {
+		x = len(b)
+		useInt(0)
+	}
+	_ = a[:x] // ERROR "Proved IsSliceInBounds"
+	y := len(a)
+	if y > len(b) {
+		y = len(b)
+		useInt(0)
+	} else {
+		useInt(1)
+	}
+	_ = b[:y] // ERROR "Proved IsSliceInBounds"
+}
+
+func issue16833(a, b []byte) {
+	n := copy(a, b)
+	_ = a[n:] // ERROR "Proved IsSliceInBounds"
+	_ = b[n:] // ERROR "Proved IsSliceInBounds"
+	_ = a[:n] // ERROR "Proved IsSliceInBounds"
+	_ = b[:n] // ERROR "Proved IsSliceInBounds"
+}
+
+func clampedIdx1(x []int, i int) int {
+	if len(x) == 0 {
+		return 0
+	}
+	return x[min(max(0, i), len(x)-1)] // ERROR "Proved IsInBounds"
+}
+func clampedIdx2(x []int, i int) int {
+	if len(x) == 0 {
+		return 0
+	}
+	return x[max(min(i, len(x)-1), 0)] // TODO: can't get rid of this bounds check yet
+}
+
 //go:noinline
 func useInt(a int) {
 }
diff --git a/test/prove_constant_folding.go b/test/prove_constant_folding.go
index ed63e685..bca96847 100644
--- a/test/prove_constant_folding.go
+++ b/test/prove_constant_folding.go
@@ -14,7 +14,7 @@ func f0i(x int) int {
   }
 
   if (x + 20) == 20 {
-    return x + 5 // ERROR "Proved.+is constant 0$"
+    return x + 5 // ERROR "Proved.+is constant 0$" "Proved.+is constant 5$"
   }
 
   return x / 2
@@ -26,7 +26,7 @@ func f0u(x uint) uint {
   }
 
   if (x + 20) == 20 {
-    return x + 5 // ERROR "Proved.+is constant 0$"
+    return x + 5 // ERROR "Proved.+is constant 0$" "Proved.+is constant 5$"
   }
 
   return x / 2
diff --git a/test/runtime/README b/test/runtime/README
deleted file mode 100644
index 249031af..00000000
--- a/test/runtime/README
+++ /dev/null
@@ -1,7 +0,0 @@
-// Copyright 2019 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-The runtime directory contains tests that specifically need
-to be compiled as-if in the runtime package.  For error-check
-tests, these require the additional flags -+ and -p=runtime.
diff --git a/test/switch2.go b/test/switch2.go
index 66e89fda..113d81be 100644
--- a/test/switch2.go
+++ b/test/switch2.go
@@ -25,12 +25,12 @@ func f() {
 
 	switch {
 	case 0: f(); case 0:
-	case 0: f() case 0: // ERROR "unexpected case at end of statement"
+	case 0: f() case 0: // ERROR "unexpected keyword case at end of statement"
 	}
 
 	switch {
 	case 0: f(); default:
-	case 0: f() default: // ERROR "unexpected default at end of statement"
+	case 0: f() default: // ERROR "unexpected keyword default at end of statement"
 	}
 
 	switch {
diff --git a/test/syntax/semi7.go b/test/syntax/semi7.go
index a1948b0f..acd2f835 100644
--- a/test/syntax/semi7.go
+++ b/test/syntax/semi7.go
@@ -8,7 +8,7 @@ package main
 
 func main() {
 	if x { }	// GCCGO_ERROR "undefined"
-	else { }	// ERROR "unexpected semicolon or newline before .?else.?|unexpected else"
+	else { }	// ERROR "unexpected semicolon or newline before .?else.?|unexpected keyword else"
 }
 
 
diff --git a/test/tailcall.go b/test/tailcall.go
new file mode 100644
index 00000000..6b14a2f1
--- /dev/null
+++ b/test/tailcall.go
@@ -0,0 +1,29 @@
+// errorcheck -0 -d=tailcall=1
+
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package p
+
+// Test that when generating wrappers for methods, we generate a tail call to the pointer version of
+// the method, if that method is not inlineable. We use go:noinline here to force the non-inlineability
+// condition.
+
+//go:noinline
+func (f *Foo) Get2Vals() [2]int { return [2]int{f.Val, f.Val + 1} }
+func (f *Foo) Get3Vals() [3]int { return [3]int{f.Val, f.Val + 1, f.Val + 2} }
+
+type Foo struct{ Val int }
+
+type Bar struct { // ERROR "tail call emitted for the method \(\*Foo\).Get2Vals wrapper"
+	int64
+	*Foo // needs a method wrapper
+	string
+}
+
+var i any
+
+func init() {
+	i = Bar{1, nil, "first"}
+}
diff --git a/test/wasmexport.go b/test/wasmexport.go
new file mode 100644
index 00000000..3b92ae93
--- /dev/null
+++ b/test/wasmexport.go
@@ -0,0 +1,19 @@
+// errorcheck
+
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Verify that misplaced directives are diagnosed.
+
+//go:build wasm
+
+package p
+
+//go:wasmexport F
+func F() {} // OK
+
+type S int32
+
+//go:wasmexport M
+func (S) M() {} // ERROR "cannot use //go:wasmexport on a method"
diff --git a/test/wasmexport2.go b/test/wasmexport2.go
new file mode 100644
index 00000000..cfbfab99
--- /dev/null
+++ b/test/wasmexport2.go
@@ -0,0 +1,92 @@
+// errorcheck
+
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Verify that wasmexport supports allowed types and rejects
+// unallowed types.
+
+//go:build wasm
+
+package p
+
+import (
+	"structs"
+	"unsafe"
+)
+
+//go:wasmexport good1
+func good1(int32, uint32, int64, uint64, float32, float64, unsafe.Pointer) {} // allowed types
+
+type MyInt32 int32
+
+//go:wasmexport good2
+func good2(MyInt32) {} // named type is ok
+
+//go:wasmexport good3
+func good3() int32 { return 0 } // one result is ok
+
+//go:wasmexport good4
+func good4() unsafe.Pointer { return nil } // one result is ok
+
+//go:wasmexport good5
+func good5(string, uintptr) bool { return false } // bool, string, and uintptr are allowed
+
+//go:wasmexport bad1
+func bad1(any) {} // ERROR "go:wasmexport: unsupported parameter type"
+
+//go:wasmexport bad2
+func bad2(func()) {} // ERROR "go:wasmexport: unsupported parameter type"
+
+//go:wasmexport bad3
+func bad3(uint8) {} // ERROR "go:wasmexport: unsupported parameter type"
+
+//go:wasmexport bad4
+func bad4(int) {} // ERROR "go:wasmexport: unsupported parameter type"
+
+// Struct and array types are also not allowed.
+
+type S struct { x, y int32 }
+
+type H struct { _ structs.HostLayout; x, y int32 }
+
+type A = structs.HostLayout
+
+type AH struct { _ A; x, y int32 }
+
+//go:wasmexport bad5
+func bad5(S) {} // ERROR "go:wasmexport: unsupported parameter type"
+
+//go:wasmexport bad6
+func bad6(H) {} // ERROR "go:wasmexport: unsupported parameter type"
+
+//go:wasmexport bad7
+func bad7([4]int32) {} // ERROR "go:wasmexport: unsupported parameter type"
+
+// Pointer types are not allowed, with resitrictions on
+// the element type.
+
+//go:wasmexport good6
+func good6(*int32, *uint8, *bool) {}
+
+//go:wasmexport bad8
+func bad8(*S) {} // ERROR "go:wasmexport: unsupported parameter type" // without HostLayout, not allowed
+
+//go:wasmexport bad9
+func bad9() *S { return nil } // ERROR "go:wasmexport: unsupported result type"
+
+//go:wasmexport good7
+func good7(*H, *AH) {} // pointer to struct with HostLayout is allowed
+
+//go:wasmexport good8
+func good8(*struct{}) {} // pointer to empty struct is allowed
+
+//go:wasmexport good9
+func good9(*[4]int32, *[2]H) {} // pointer to array is allowed, if the element type is okay
+
+//go:wasmexport toomanyresults
+func toomanyresults() (int32, int32) { return 0, 0 } // ERROR "go:wasmexport: too many return values"
+
+//go:wasmexport bad10
+func bad10() string { return "" } // ERROR "go:wasmexport: unsupported result type" // string cannot be a result
diff --git a/test/wasmmemsize.dir/asm_wasm.s b/test/wasmmemsize.dir/asm_wasm.s
new file mode 100644
index 00000000..daccfcc7
--- /dev/null
+++ b/test/wasmmemsize.dir/asm_wasm.s
@@ -0,0 +1,11 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "textflag.h"
+
+TEXT ·currentMemory(SB), NOSPLIT, $0
+	Get SP
+	CurrentMemory
+	I32Store ret+0(FP)
+	RET
diff --git a/test/wasmmemsize.dir/main.go b/test/wasmmemsize.dir/main.go
new file mode 100644
index 00000000..d3beab24
--- /dev/null
+++ b/test/wasmmemsize.dir/main.go
@@ -0,0 +1,30 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+import (
+	"fmt"
+	"io"
+)
+
+// Expect 8 MB of memory usage for a small wasm program.
+// This reflects the current allocator. We test an exact
+// value here, but if the allocator changes, we can update
+// or relax this.
+const want = 8 << 20
+
+var w = io.Discard
+
+func main() {
+	fmt.Fprintln(w, "hello world")
+
+	const pageSize = 64 * 1024
+	sz := uintptr(currentMemory()) * pageSize
+	if sz != want {
+		fmt.Printf("FAIL: unexpected memory size %d, want %d\n", sz, want)
+	}
+}
+
+func currentMemory() int32 // implemented in assembly
diff --git a/test/wasmmemsize.go b/test/wasmmemsize.go
new file mode 100644
index 00000000..44981690
--- /dev/null
+++ b/test/wasmmemsize.go
@@ -0,0 +1,11 @@
+// runindir
+
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// This test checks the memory size of a small wasm program.
+
+//go:build wasm
+
+package ignored
diff --git a/test/weak.go b/test/weak.go
new file mode 100644
index 00000000..ca3ec797
--- /dev/null
+++ b/test/weak.go
@@ -0,0 +1,24 @@
+// errorcheck
+
+// Copyright 2025 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Test weak pointers.
+
+package p
+
+import (
+	"runtime"
+	"weak"
+)
+
+// Adapted from example in https://github.com/golang/go/issues/67552#issuecomment-2639661220
+func conversion() {
+	p := "hello"
+	a := weak.Make(&p)
+	b := (weak.Pointer[*byte])(a) // ERROR "cannot convert a \(variable of struct type weak\.Pointer\[string\]\) to type weak.Pointer\[\*byte\]"
+	c := b.Value()
+	println(**c)
+	runtime.KeepAlive(p)
+}