Initial commit: Go 1.23 release state

test/codegen/copy.go

@@ -0,0 +1,159 @@
+// asmcheck
+
+// 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.
+
+package codegen
+
+import "runtime"
+
+// Check small copies are replaced with moves.
+
+func movesmall4() {
+	x := [...]byte{1, 2, 3, 4}
+	// 386:-".*memmove"
+	// amd64:-".*memmove"
+	// arm:-".*memmove"
+	// arm64:-".*memmove"
+	// ppc64x:-".*memmove"
+	copy(x[1:], x[:])
+}
+
+func movesmall7() {
+	x := [...]byte{1, 2, 3, 4, 5, 6, 7}
+	// 386:-".*memmove"
+	// amd64:-".*memmove"
+	// arm64:-".*memmove"
+	// ppc64x:-".*memmove"
+	copy(x[1:], x[:])
+}
+
+func movesmall16() {
+	x := [...]byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16}
+	// amd64:-".*memmove"
+	// ppc64x:".*memmove"
+	copy(x[1:], x[:])
+}
+
+var x [256]byte
+
+// Check that large disjoint copies are replaced with moves.
+
+func moveDisjointStack32() {
+	var s [32]byte
+	// ppc64x:-".*memmove"
+	// ppc64x/power8:"LXVD2X",-"ADD",-"BC"
+	// ppc64x/power9:"LXV",-"LXVD2X",-"ADD",-"BC"
+	copy(s[:], x[:32])
+	runtime.KeepAlive(&s)
+}
+
+func moveDisjointStack64() {
+	var s [96]byte
+	// ppc64x:-".*memmove"
+	// ppc64x/power8:"LXVD2X","ADD","BC"
+	// ppc64x/power9:"LXV",-"LXVD2X",-"ADD",-"BC"
+	copy(s[:], x[:96])
+	runtime.KeepAlive(&s)
+}
+
+func moveDisjointStack() {
+	var s [256]byte
+	// s390x:-".*memmove"
+	// amd64:-".*memmove"
+	// ppc64x:-".*memmove"
+	// ppc64x/power8:"LXVD2X"
+	// ppc64x/power9:"LXV",-"LXVD2X"
+	copy(s[:], x[:])
+	runtime.KeepAlive(&s)
+}
+
+func moveDisjointArg(b *[256]byte) {
+	var s [256]byte
+	// s390x:-".*memmove"
+	// amd64:-".*memmove"
+	// ppc64x:-".*memmove"
+	// ppc64x/power8:"LXVD2X"
+	// ppc64x/power9:"LXV",-"LXVD2X"
+	copy(s[:], b[:])
+	runtime.KeepAlive(&s)
+}
+
+func moveDisjointNoOverlap(a *[256]byte) {
+	// s390x:-".*memmove"
+	// amd64:-".*memmove"
+	// ppc64x:-".*memmove"
+	// ppc64x/power8:"LXVD2X"
+	// ppc64x/power9:"LXV",-"LXVD2X"
+	copy(a[:], a[128:])
+}
+
+// Check arch-specific memmove lowering. See issue 41662 fot details
+
+func moveArchLowering1(b []byte, x *[1]byte) {
+	_ = b[1]
+	// amd64:-".*memmove"
+	// arm64:-".*memmove"
+	// ppc64x:-".*memmove"
+	copy(b, x[:])
+}
+
+func moveArchLowering2(b []byte, x *[2]byte) {
+	_ = b[2]
+	// amd64:-".*memmove"
+	// arm64:-".*memmove"
+	// ppc64x:-".*memmove"
+	copy(b, x[:])
+}
+
+func moveArchLowering4(b []byte, x *[4]byte) {
+	_ = b[4]
+	// amd64:-".*memmove"
+	// arm64:-".*memmove"
+	// ppc64x:-".*memmove"
+	copy(b, x[:])
+}
+
+func moveArchLowering8(b []byte, x *[8]byte) {
+	_ = b[8]
+	// amd64:-".*memmove"
+	// arm64:-".*memmove"
+	// ppc64x:-".*memmove"
+	copy(b, x[:])
+}
+
+func moveArchLowering16(b []byte, x *[16]byte) {
+	_ = b[16]
+	// amd64:-".*memmove"
+	copy(b, x[:])
+}
+
+// Check that no branches are generated when the pointers are [not] equal.
+
+func ptrEqual() {
+	// amd64:-"JEQ",-"JNE"
+	// ppc64x:-"BEQ",-"BNE"
+	// s390x:-"BEQ",-"BNE"
+	copy(x[:], x[:])
+}
+
+func ptrOneOffset() {
+	// amd64:-"JEQ",-"JNE"
+	// ppc64x:-"BEQ",-"BNE"
+	// s390x:-"BEQ",-"BNE"
+	copy(x[1:], x[:])
+}
+
+func ptrBothOffset() {
+	// amd64:-"JEQ",-"JNE"
+	// ppc64x:-"BEQ",-"BNE"
+	// s390x:-"BEQ",-"BNE"
+	copy(x[1:], x[2:])
+}
+
+// Verify #62698 on PPC64.
+func noMaskOnCopy(a []int, s string, x int) int {
+	// ppc64x:-"MOVD\t$-1", -"AND"
+	return a[x&^copy([]byte{}, s)]
+}