mirror of
https://github.com/golang/go
synced 2024-11-06 10:36:13 -07:00
653a4bd8d4
Instead of MOVB go.string."foo"(SB), AX do MOVB $102, AX When we know the global we're loading from is readonly, we can do that read at compile time. I've made this arch-dependent mostly because the cases where this happens often are memory->memory moves, and those don't get decomposed until lowering. Did amd64/386/arm/arm64. Other architectures could follow. Update #26498 Change-Id: I41b1dc831b2cd0a52dac9b97f4f4457888a46389 Reviewed-on: https://go-review.googlesource.com/c/141118 Run-TryBot: Keith Randall <khr@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
50 lines
1.4 KiB
Go
50 lines
1.4 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
|
|
|
|
// This file contains code generation tests related to the handling of
|
|
// string types.
|
|
|
|
func CountRunes(s string) int { // Issue #24923
|
|
// amd64:`.*countrunes`
|
|
return len([]rune(s))
|
|
}
|
|
|
|
func ToByteSlice() []byte { // Issue #24698
|
|
// amd64:`LEAQ\ttype\.\[3\]uint8`
|
|
// amd64:`CALL\truntime\.newobject`
|
|
// amd64:-`.*runtime.stringtoslicebyte`
|
|
return []byte("foo")
|
|
}
|
|
|
|
// Loading from read-only symbols should get transformed into constants.
|
|
func ConstantLoad() {
|
|
// 12592 = 0x3130
|
|
// 50 = 0x32
|
|
// amd64:`MOVW\t\$12592, \(`,`MOVB\t\$50, 2\(`
|
|
// 386:`MOVW\t\$12592, \(`,`MOVB\t\$50, 2\(`
|
|
// arm:`MOVW\t\$48`,`MOVW\t\$49`,`MOVW\t\$50`
|
|
// arm64:`MOVD\t\$12592`,`MOVD\t\$50`
|
|
bsink = []byte("012")
|
|
|
|
// 858927408 = 0x33323130
|
|
// 13620 = 0x3534
|
|
// amd64:`MOVL\t\$858927408`,`MOVW\t\$13620, 4\(`
|
|
// 386:`MOVL\t\$858927408`,`MOVW\t\$13620, 4\(`
|
|
// arm64:`MOVD\t\$858927408`,`MOVD\t\$13620`
|
|
bsink = []byte("012345")
|
|
|
|
// 3978425819141910832 = 0x3736353433323130
|
|
// 7306073769690871863 = 0x6564636261393837
|
|
// amd64:`MOVQ\t\$3978425819141910832`,`MOVQ\t\$7306073769690871863`
|
|
// 386:`MOVL\t\$858927408, \(`,`DUFFCOPY`
|
|
// arm64:`MOVD\t\$3978425819141910832`,`MOVD\t\$1650538808`,`MOVD\t\$25699`,`MOVD\t\$101`
|
|
bsink = []byte("0123456789abcde")
|
|
}
|
|
|
|
var bsink []byte
|