Initial commit: Go 1.23 release state

test/codegen/slices.go

@@ -0,0 +1,426 @@
+// 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 "unsafe"
+
+// This file contains code generation tests related to the handling of
+// slice types.
+
+// ------------------ //
+//      Clear         //
+// ------------------ //
+
+// Issue #5373 optimize memset idiom
+// Some of the clears get inlined, see #56997
+
+func SliceClear(s []int) []int {
+	// amd64:`.*memclrNoHeapPointers`
+	// ppc64x:`.*memclrNoHeapPointers`
+	for i := range s {
+		s[i] = 0
+	}
+	return s
+}
+
+func SliceClearPointers(s []*int) []*int {
+	// amd64:`.*memclrHasPointers`
+	// ppc64x:`.*memclrHasPointers`
+	for i := range s {
+		s[i] = nil
+	}
+	return s
+}
+
+// ------------------ //
+//      Extension     //
+// ------------------ //
+
+// Issue #21266 - avoid makeslice in append(x, make([]T, y)...)
+
+func SliceExtensionConst(s []int) []int {
+	// amd64:-`.*runtime\.memclrNoHeapPointers`
+	// amd64:-`.*runtime\.makeslice`
+	// amd64:-`.*runtime\.panicmakeslicelen`
+	// amd64:"MOVUPS\tX15"
+	// ppc64x:-`.*runtime\.memclrNoHeapPointers`
+	// ppc64x:-`.*runtime\.makeslice`
+	// ppc64x:-`.*runtime\.panicmakeslicelen`
+	return append(s, make([]int, 1<<2)...)
+}
+
+func SliceExtensionConstInt64(s []int) []int {
+	// amd64:-`.*runtime\.memclrNoHeapPointers`
+	// amd64:-`.*runtime\.makeslice`
+	// amd64:-`.*runtime\.panicmakeslicelen`
+	// amd64:"MOVUPS\tX15"
+	// ppc64x:-`.*runtime\.memclrNoHeapPointers`
+	// ppc64x:-`.*runtime\.makeslice`
+	// ppc64x:-`.*runtime\.panicmakeslicelen`
+	return append(s, make([]int, int64(1<<2))...)
+}
+
+func SliceExtensionConstUint64(s []int) []int {
+	// amd64:-`.*runtime\.memclrNoHeapPointers`
+	// amd64:-`.*runtime\.makeslice`
+	// amd64:-`.*runtime\.panicmakeslicelen`
+	// amd64:"MOVUPS\tX15"
+	// ppc64x:-`.*runtime\.memclrNoHeapPointers`
+	// ppc64x:-`.*runtime\.makeslice`
+	// ppc64x:-`.*runtime\.panicmakeslicelen`
+	return append(s, make([]int, uint64(1<<2))...)
+}
+
+func SliceExtensionConstUint(s []int) []int {
+	// amd64:-`.*runtime\.memclrNoHeapPointers`
+	// amd64:-`.*runtime\.makeslice`
+	// amd64:-`.*runtime\.panicmakeslicelen`
+	// amd64:"MOVUPS\tX15"
+	// ppc64x:-`.*runtime\.memclrNoHeapPointers`
+	// ppc64x:-`.*runtime\.makeslice`
+	// ppc64x:-`.*runtime\.panicmakeslicelen`
+	return append(s, make([]int, uint(1<<2))...)
+}
+
+// On ppc64x continue to use memclrNoHeapPointers
+// for sizes >= 512.
+func SliceExtensionConst512(s []int) []int {
+	// amd64:-`.*runtime\.memclrNoHeapPointers`
+	// ppc64x:`.*runtime\.memclrNoHeapPointers`
+	return append(s, make([]int, 1<<9)...)
+}
+
+func SliceExtensionPointer(s []*int, l int) []*int {
+	// amd64:`.*runtime\.memclrHasPointers`
+	// amd64:-`.*runtime\.makeslice`
+	// ppc64x:`.*runtime\.memclrHasPointers`
+	// ppc64x:-`.*runtime\.makeslice`
+	return append(s, make([]*int, l)...)
+}
+
+func SliceExtensionVar(s []byte, l int) []byte {
+	// amd64:`.*runtime\.memclrNoHeapPointers`
+	// amd64:-`.*runtime\.makeslice`
+	// ppc64x:`.*runtime\.memclrNoHeapPointers`
+	// ppc64x:-`.*runtime\.makeslice`
+	return append(s, make([]byte, l)...)
+}
+
+func SliceExtensionVarInt64(s []byte, l int64) []byte {
+	// amd64:`.*runtime\.memclrNoHeapPointers`
+	// amd64:-`.*runtime\.makeslice`
+	// amd64:`.*runtime\.panicmakeslicelen`
+	return append(s, make([]byte, l)...)
+}
+
+func SliceExtensionVarUint64(s []byte, l uint64) []byte {
+	// amd64:`.*runtime\.memclrNoHeapPointers`
+	// amd64:-`.*runtime\.makeslice`
+	// amd64:`.*runtime\.panicmakeslicelen`
+	return append(s, make([]byte, l)...)
+}
+
+func SliceExtensionVarUint(s []byte, l uint) []byte {
+	// amd64:`.*runtime\.memclrNoHeapPointers`
+	// amd64:-`.*runtime\.makeslice`
+	// amd64:`.*runtime\.panicmakeslicelen`
+	return append(s, make([]byte, l)...)
+}
+
+func SliceExtensionInt64(s []int, l64 int64) []int {
+	// 386:`.*runtime\.makeslice`
+	// 386:-`.*runtime\.memclr`
+	return append(s, make([]int, l64)...)
+}
+
+// ------------------ //
+//      Make+Copy     //
+// ------------------ //
+
+// Issue #26252 - avoid memclr for make+copy
+
+func SliceMakeCopyLen(s []int) []int {
+	// amd64:`.*runtime\.mallocgc`
+	// amd64:`.*runtime\.memmove`
+	// amd64:-`.*runtime\.makeslice`
+	// ppc64x:`.*runtime\.mallocgc`
+	// ppc64x:`.*runtime\.memmove`
+	// ppc64x:-`.*runtime\.makeslice`
+	a := make([]int, len(s))
+	copy(a, s)
+	return a
+}
+
+func SliceMakeCopyLenPtr(s []*int) []*int {
+	// amd64:`.*runtime\.makeslicecopy`
+	// amd64:-`.*runtime\.makeslice\(`
+	// amd64:-`.*runtime\.typedslicecopy
+	// ppc64x:`.*runtime\.makeslicecopy`
+	// ppc64x:-`.*runtime\.makeslice\(`
+	// ppc64x:-`.*runtime\.typedslicecopy
+	a := make([]*int, len(s))
+	copy(a, s)
+	return a
+}
+
+func SliceMakeCopyConst(s []int) []int {
+	// amd64:`.*runtime\.makeslicecopy`
+	// amd64:-`.*runtime\.makeslice\(`
+	// amd64:-`.*runtime\.memmove`
+	a := make([]int, 4)
+	copy(a, s)
+	return a
+}
+
+func SliceMakeCopyConstPtr(s []*int) []*int {
+	// amd64:`.*runtime\.makeslicecopy`
+	// amd64:-`.*runtime\.makeslice\(`
+	// amd64:-`.*runtime\.typedslicecopy
+	a := make([]*int, 4)
+	copy(a, s)
+	return a
+}
+
+func SliceMakeCopyNoOptNoDeref(s []*int) []*int {
+	a := new([]*int)
+	// amd64:-`.*runtime\.makeslicecopy`
+	// amd64:`.*runtime\.makeslice\(`
+	*a = make([]*int, 4)
+	// amd64:-`.*runtime\.makeslicecopy`
+	// amd64:`.*runtime\.typedslicecopy`
+	copy(*a, s)
+	return *a
+}
+
+func SliceMakeCopyNoOptNoVar(s []*int) []*int {
+	a := make([][]*int, 1)
+	// amd64:-`.*runtime\.makeslicecopy`
+	// amd64:`.*runtime\.makeslice\(`
+	a[0] = make([]*int, 4)
+	// amd64:-`.*runtime\.makeslicecopy`
+	// amd64:`.*runtime\.typedslicecopy`
+	copy(a[0], s)
+	return a[0]
+}
+
+func SliceMakeCopyNoOptBlank(s []*int) []*int {
+	var a []*int
+	// amd64:-`.*runtime\.makeslicecopy`
+	_ = make([]*int, 4)
+	// amd64:-`.*runtime\.makeslicecopy`
+	// amd64:`.*runtime\.typedslicecopy`
+	copy(a, s)
+	return a
+}
+
+func SliceMakeCopyNoOptNoMake(s []*int) []*int {
+	// amd64:-`.*runtime\.makeslicecopy`
+	// amd64:-`.*runtime\.objectnew`
+	a := *new([]*int)
+	// amd64:-`.*runtime\.makeslicecopy`
+	// amd64:`.*runtime\.typedslicecopy`
+	copy(a, s)
+	return a
+}
+
+func SliceMakeCopyNoOptNoHeapAlloc(s []*int) int {
+	// amd64:-`.*runtime\.makeslicecopy`
+	a := make([]*int, 4)
+	// amd64:-`.*runtime\.makeslicecopy`
+	// amd64:`.*runtime\.typedslicecopy`
+	copy(a, s)
+	return cap(a)
+}
+
+func SliceMakeCopyNoOptNoCap(s []*int) []*int {
+	// amd64:-`.*runtime\.makeslicecopy`
+	// amd64:`.*runtime\.makeslice\(`
+	a := make([]*int, 0, 4)
+	// amd64:-`.*runtime\.makeslicecopy`
+	// amd64:`.*runtime\.typedslicecopy`
+	copy(a, s)
+	return a
+}
+
+func SliceMakeCopyNoOptNoCopy(s []*int) []*int {
+	copy := func(x, y []*int) {}
+	// amd64:-`.*runtime\.makeslicecopy`
+	// amd64:`.*runtime\.makeslice\(`
+	a := make([]*int, 4)
+	// amd64:-`.*runtime\.makeslicecopy`
+	copy(a, s)
+	return a
+}
+
+func SliceMakeCopyNoOptWrongOrder(s []*int) []*int {
+	// amd64:-`.*runtime\.makeslicecopy`
+	// amd64:`.*runtime\.makeslice\(`
+	a := make([]*int, 4)
+	// amd64:`.*runtime\.typedslicecopy`
+	// amd64:-`.*runtime\.makeslicecopy`
+	copy(s, a)
+	return a
+}
+
+func SliceMakeCopyNoOptWrongAssign(s []*int) []*int {
+	var a []*int
+	// amd64:-`.*runtime\.makeslicecopy`
+	// amd64:`.*runtime\.makeslice\(`
+	s = make([]*int, 4)
+	// amd64:`.*runtime\.typedslicecopy`
+	// amd64:-`.*runtime\.makeslicecopy`
+	copy(a, s)
+	return s
+}
+
+func SliceMakeCopyNoOptCopyLength(s []*int) (int, []*int) {
+	// amd64:-`.*runtime\.makeslicecopy`
+	// amd64:`.*runtime\.makeslice\(`
+	a := make([]*int, 4)
+	// amd64:`.*runtime\.typedslicecopy`
+	// amd64:-`.*runtime\.makeslicecopy`
+	n := copy(a, s)
+	return n, a
+}
+
+func SliceMakeCopyNoOptSelfCopy(s []*int) []*int {
+	// amd64:-`.*runtime\.makeslicecopy`
+	// amd64:`.*runtime\.makeslice\(`
+	a := make([]*int, 4)
+	// amd64:`.*runtime\.typedslicecopy`
+	// amd64:-`.*runtime\.makeslicecopy`
+	copy(a, a)
+	return a
+}
+
+func SliceMakeCopyNoOptTargetReference(s []*int) []*int {
+	// amd64:-`.*runtime\.makeslicecopy`
+	// amd64:`.*runtime\.makeslice\(`
+	a := make([]*int, 4)
+	// amd64:`.*runtime\.typedslicecopy`
+	// amd64:-`.*runtime\.makeslicecopy`
+	copy(a, s[:len(a)])
+	return a
+}
+
+func SliceMakeCopyNoOptCap(s []int) []int {
+	// amd64:-`.*runtime\.makeslicecopy`
+	// amd64:`.*runtime\.makeslice\(`
+	a := make([]int, len(s), 9)
+	// amd64:-`.*runtime\.makeslicecopy`
+	// amd64:`.*runtime\.memmove`
+	copy(a, s)
+	return a
+}
+
+func SliceMakeCopyNoMemmoveDifferentLen(s []int) []int {
+	// amd64:`.*runtime\.makeslicecopy`
+	// amd64:-`.*runtime\.memmove`
+	a := make([]int, len(s)-1)
+	// amd64:-`.*runtime\.memmove`
+	copy(a, s)
+	return a
+}
+
+func SliceMakeEmptyPointerToZerobase() []int {
+	// amd64:`LEAQ.+runtime\.zerobase`
+	// amd64:-`.*runtime\.makeslice`
+	return make([]int, 0)
+}
+
+// ---------------------- //
+//   Nil check of &s[0]   //
+// ---------------------- //
+// See issue 30366
+func SliceNilCheck(s []int) {
+	p := &s[0]
+	// amd64:-`TESTB`
+	_ = *p
+}
+
+// ---------------------- //
+//   Init slice literal   //
+// ---------------------- //
+// See issue 21561
+func InitSmallSliceLiteral() []int {
+	// amd64:`MOVQ\t[$]42`
+	return []int{42}
+}
+
+func InitNotSmallSliceLiteral() []int {
+	// amd64:`LEAQ\t.*stmp_`
+	return []int{
+		42,
+		42,
+		42,
+		42,
+		42,
+		42,
+		42,
+		42,
+		42,
+		42,
+		42,
+		42,
+		42,
+		42,
+		42,
+		42,
+		42,
+		42,
+		42,
+		42,
+		42,
+		42,
+		42,
+		42,
+		42,
+		42,
+		42,
+		42,
+		42,
+		42,
+		42,
+		42,
+		42,
+		42,
+		42,
+		42,
+	}
+}
+
+// --------------------------------------- //
+//   Test PPC64 SUBFCconst folding rules   //
+//   triggered by slice operations.        //
+// --------------------------------------- //
+
+func SliceWithConstCompare(a []int, b int) []int {
+	var c []int = []int{1, 2, 3, 4, 5}
+	if b+len(a) < len(c) {
+		// ppc64x:-"NEG"
+		return c[b:]
+	}
+	return a
+}
+
+func SliceWithSubtractBound(a []int, b int) []int {
+	// ppc64x:"SUBC",-"NEG"
+	return a[(3 - b):]
+}
+
+// --------------------------------------- //
+//   Code generation for unsafe.Slice      //
+// --------------------------------------- //
+
+func Slice1(p *byte, i int) []byte {
+	// amd64:-"MULQ"
+	return unsafe.Slice(p, i)
+}
+func Slice0(p *struct{}, i int) []struct{} {
+	// amd64:-"MULQ"
+	return unsafe.Slice(p, i)
+}