mirror of
https://github.com/golang/go
synced 2024-11-17 17:54:48 -07:00
c292b32f33
Memmove can use AVX/prefetches/other optional instructions, so only do it for small sizes, when call overhead dominates. Change-Id: Ice5e93deb11462217f7fb5fc350b703109bb4090 Reviewed-on: https://go-review.googlesource.com/112517 Run-TryBot: Ilya Tocar <ilya.tocar@intel.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Michael Munday <mike.munday@ibm.com>
84 lines
1.6 KiB
Go
84 lines
1.6 KiB
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 "runtime"
|
|
|
|
// Check small copies are replaced with moves.
|
|
|
|
func movesmall4() {
|
|
x := [...]byte{1, 2, 3, 4}
|
|
// 386:-".*memmove"
|
|
// amd64:-".*memmove"
|
|
// arm:-".*memmove"
|
|
// arm64:-".*memmove"
|
|
copy(x[1:], x[:])
|
|
}
|
|
|
|
func movesmall7() {
|
|
x := [...]byte{1, 2, 3, 4, 5, 6, 7}
|
|
// 386:-".*memmove"
|
|
// amd64:-".*memmove"
|
|
// arm64:-".*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"
|
|
copy(x[1:], x[:])
|
|
}
|
|
|
|
var x [256]byte
|
|
|
|
// Check that large disjoint copies are replaced with moves.
|
|
|
|
func moveDisjointStack() {
|
|
var s [256]byte
|
|
// s390x:-".*memmove"
|
|
// amd64:-".*memmove"
|
|
copy(s[:], x[:])
|
|
runtime.KeepAlive(&s)
|
|
}
|
|
|
|
func moveDisjointArg(b *[256]byte) {
|
|
var s [256]byte
|
|
// s390x:-".*memmove"
|
|
// amd64:-".*memmove"
|
|
copy(s[:], b[:])
|
|
runtime.KeepAlive(&s)
|
|
}
|
|
|
|
func moveDisjointNoOverlap(a *[256]byte) {
|
|
// s390x:-".*memmove"
|
|
// amd64:-".*memmove"
|
|
copy(a[:], a[128:])
|
|
}
|
|
|
|
// Check that no branches are generated when the pointers are [not] equal.
|
|
|
|
func ptrEqual() {
|
|
// amd64:-"JEQ",-"JNE"
|
|
// ppc64le:-"BEQ",-"BNE"
|
|
// s390x:-"BEQ",-"BNE"
|
|
copy(x[:], x[:])
|
|
}
|
|
|
|
func ptrOneOffset() {
|
|
// amd64:-"JEQ",-"JNE"
|
|
// ppc64le:-"BEQ",-"BNE"
|
|
// s390x:-"BEQ",-"BNE"
|
|
copy(x[1:], x[:])
|
|
}
|
|
|
|
func ptrBothOffset() {
|
|
// amd64:-"JEQ",-"JNE"
|
|
// ppc64le:-"BEQ",-"BNE"
|
|
// s390x:-"BEQ",-"BNE"
|
|
copy(x[1:], x[2:])
|
|
}
|