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Editing: slices.go
// 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) }
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