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copy.go
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// 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"
// loong64:-".*memmove"
// ppc64x:-".*memmove"
copy(b, x[:])
}
func moveArchLowering2(b []byte, x *[2]byte) {
_ = b[2]
// amd64:-".*memmove"
// arm64:-".*memmove"
// loong64:-".*memmove"
// ppc64x:-".*memmove"
copy(b, x[:])
}
func moveArchLowering4(b []byte, x *[4]byte) {
_ = b[4]
// amd64:-".*memmove"
// arm64:-".*memmove"
// loong64:-".*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)]
}