mirror of
https://github.com/golang/go
synced 2024-11-23 00:20:12 -07:00
3a0061822e
Optimize the following codes to constant 0.
function shift (x uint32) uint64 {
return uint64(x) >> 32
}
Change-Id: Ida6b39d713cc119ad5a2f01fd54bfd252cf2c975
Reviewed-on: https://go-review.googlesource.com/c/go/+/303830
Trust: fannie zhang <Fannie.Zhang@arm.com>
Run-TryBot: fannie zhang <Fannie.Zhang@arm.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
278 lines
7.2 KiB
Go
278 lines
7.2 KiB
Go
// asmcheck
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// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package codegen
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// This file contains codegen tests related to bit field
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// insertion/extraction simplifications/optimizations.
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func extr1(x, x2 uint64) uint64 {
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return x<<7 + x2>>57 // arm64:"EXTR\t[$]57,"
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}
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func extr2(x, x2 uint64) uint64 {
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return x<<7 | x2>>57 // arm64:"EXTR\t[$]57,"
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}
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func extr3(x, x2 uint64) uint64 {
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return x<<7 ^ x2>>57 // arm64:"EXTR\t[$]57,"
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}
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func extr4(x, x2 uint32) uint32 {
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return x<<7 + x2>>25 // arm64:"EXTRW\t[$]25,"
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}
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func extr5(x, x2 uint32) uint32 {
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return x<<7 | x2>>25 // arm64:"EXTRW\t[$]25,"
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}
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func extr6(x, x2 uint32) uint32 {
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return x<<7 ^ x2>>25 // arm64:"EXTRW\t[$]25,"
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}
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// check 32-bit shift masking
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func mask32(x uint32) uint32 {
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return (x << 29) >> 29 // arm64:"AND\t[$]7, R[0-9]+",-"LSR",-"LSL"
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}
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// check 16-bit shift masking
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func mask16(x uint16) uint16 {
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return (x << 14) >> 14 // arm64:"AND\t[$]3, R[0-9]+",-"LSR",-"LSL"
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}
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// check 8-bit shift masking
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func mask8(x uint8) uint8 {
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return (x << 7) >> 7 // arm64:"AND\t[$]1, R[0-9]+",-"LSR",-"LSL"
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}
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func maskshift(x uint64) uint64 {
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// arm64:"AND\t[$]4095, R[0-9]+",-"LSL",-"LSR",-"UBFIZ",-"UBFX"
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return ((x << 5) & (0xfff << 5)) >> 5
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}
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// bitfield ops
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// bfi
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func bfi1(x, y uint64) uint64 {
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// arm64:"BFI\t[$]4, R[0-9]+, [$]12",-"LSL",-"LSR",-"AND"
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return ((x & 0xfff) << 4) | (y & 0xffffffffffff000f)
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}
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func bfi2(x, y uint64) uint64 {
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// arm64:"BFI\t[$]12, R[0-9]+, [$]40",-"LSL",-"LSR",-"AND"
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return (x << 24 >> 12) | (y & 0xfff0000000000fff)
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}
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// bfxil
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func bfxil1(x, y uint64) uint64 {
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// arm64:"BFXIL\t[$]5, R[0-9]+, [$]12",-"LSL",-"LSR",-"AND"
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return ((x >> 5) & 0xfff) | (y & 0xfffffffffffff000)
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}
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func bfxil2(x, y uint64) uint64 {
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// arm64:"BFXIL\t[$]12, R[0-9]+, [$]40",-"LSL",-"LSR",-"AND"
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return (x << 12 >> 24) | (y & 0xffffff0000000000)
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}
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// sbfiz
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func sbfiz1(x int64) int64 {
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// arm64:"SBFIZ\t[$]1, R[0-9]+, [$]60",-"LSL",-"ASR"
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return (x << 4) >> 3
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}
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func sbfiz2(x int32) int64 {
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return int64(x << 3) // arm64:"SBFIZ\t[$]3, R[0-9]+, [$]29",-"LSL"
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}
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func sbfiz3(x int16) int64 {
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return int64(x << 3) // arm64:"SBFIZ\t[$]3, R[0-9]+, [$]13",-"LSL"
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}
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func sbfiz4(x int8) int64 {
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return int64(x << 3) // arm64:"SBFIZ\t[$]3, R[0-9]+, [$]5",-"LSL"
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}
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func sbfiz5(x int32) int32 {
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// arm64:"SBFIZ\t[$]1, R[0-9]+, [$]28",-"LSL",-"ASR"
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return (x << 4) >> 3
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}
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// sbfx
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func sbfx1(x int64) int64 {
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return (x << 3) >> 4 // arm64:"SBFX\t[$]1, R[0-9]+, [$]60",-"LSL",-"ASR"
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}
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func sbfx2(x int64) int64 {
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return (x << 60) >> 60 // arm64:"SBFX\tZR, R[0-9]+, [$]4",-"LSL",-"ASR"
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}
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func sbfx3(x int32) int64 {
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return int64(x) >> 3 // arm64:"SBFX\t[$]3, R[0-9]+, [$]29",-"ASR"
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}
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func sbfx4(x int16) int64 {
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return int64(x) >> 3 // arm64:"SBFX\t[$]3, R[0-9]+, [$]13",-"ASR"
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}
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func sbfx5(x int8) int64 {
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return int64(x) >> 3 // arm64:"SBFX\t[$]3, R[0-9]+, [$]5",-"ASR"
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}
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func sbfx6(x int32) int32 {
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return (x << 3) >> 4 // arm64:"SBFX\t[$]1, R[0-9]+, [$]28",-"LSL",-"ASR"
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}
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// ubfiz
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func ubfiz1(x uint64) uint64 {
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// arm64:"UBFIZ\t[$]3, R[0-9]+, [$]12",-"LSL",-"AND"
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// s390x:"RISBGZ\t[$]49, [$]60, [$]3,",-"SLD",-"AND"
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return (x & 0xfff) << 3
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}
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func ubfiz2(x uint64) uint64 {
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// arm64:"UBFIZ\t[$]4, R[0-9]+, [$]12",-"LSL",-"AND"
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// s390x:"RISBGZ\t[$]48, [$]59, [$]4,",-"SLD",-"AND"
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return (x << 4) & 0xfff0
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}
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func ubfiz3(x uint32) uint64 {
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return uint64(x+1) << 3 // arm64:"UBFIZ\t[$]3, R[0-9]+, [$]32",-"LSL"
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}
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func ubfiz4(x uint16) uint64 {
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return uint64(x+1) << 3 // arm64:"UBFIZ\t[$]3, R[0-9]+, [$]16",-"LSL"
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}
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func ubfiz5(x uint8) uint64 {
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return uint64(x+1) << 3 // arm64:"UBFIZ\t[$]3, R[0-9]+, [$]8",-"LSL"
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}
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func ubfiz6(x uint64) uint64 {
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// arm64:"UBFIZ\t[$]1, R[0-9]+, [$]60",-"LSL",-"LSR"
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// s390x:"RISBGZ\t[$]3, [$]62, [$]1, ",-"SLD",-"SRD"
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return (x << 4) >> 3
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}
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func ubfiz7(x uint32) uint32 {
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// arm64:"UBFIZ\t[$]1, R[0-9]+, [$]28",-"LSL",-"LSR"
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return (x << 4) >> 3
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}
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func ubfiz8(x uint64) uint64 {
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// arm64:"UBFIZ\t[$]1, R[0-9]+, [$]20",-"LSL",-"LSR"
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// s390x:"RISBGZ\t[$]43, [$]62, [$]1, ",-"SLD",-"SRD",-"AND"
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return ((x & 0xfffff) << 4) >> 3
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}
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func ubfiz9(x uint64) uint64 {
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// arm64:"UBFIZ\t[$]5, R[0-9]+, [$]13",-"LSL",-"LSR",-"AND"
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return ((x << 3) & 0xffff) << 2
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}
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func ubfiz10(x uint64) uint64 {
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// arm64:"UBFIZ\t[$]7, R[0-9]+, [$]12",-"LSL",-"LSR",-"AND"
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// s390x:"RISBGZ\t[$]45, [$]56, [$]7, ",-"SLD",-"SRD",-"AND"
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return ((x << 5) & (0xfff << 5)) << 2
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}
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// ubfx
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func ubfx1(x uint64) uint64 {
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// arm64:"UBFX\t[$]25, R[0-9]+, [$]10",-"LSR",-"AND"
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// s390x:"RISBGZ\t[$]54, [$]63, [$]39, ",-"SRD",-"AND"
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return (x >> 25) & 1023
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}
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func ubfx2(x uint64) uint64 {
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// arm64:"UBFX\t[$]4, R[0-9]+, [$]8",-"LSR",-"AND"
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// s390x:"RISBGZ\t[$]56, [$]63, [$]60, ",-"SRD",-"AND"
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return (x & 0x0ff0) >> 4
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}
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func ubfx3(x uint32) uint64 {
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return uint64(x >> 15) // arm64:"UBFX\t[$]15, R[0-9]+, [$]17",-"LSR"
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}
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func ubfx4(x uint16) uint64 {
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return uint64(x >> 9) // arm64:"UBFX\t[$]9, R[0-9]+, [$]7",-"LSR"
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}
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func ubfx5(x uint8) uint64 {
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return uint64(x >> 3) // arm64:"UBFX\t[$]3, R[0-9]+, [$]5",-"LSR"
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}
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func ubfx6(x uint64) uint64 {
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// arm64:"UBFX\t[$]1, R[0-9]+, [$]62",-"LSL",-"LSR"
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// s390x:"RISBGZ\t[$]2, [$]63, [$]63,",-"SLD",-"SRD"
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return (x << 1) >> 2
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}
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func ubfx7(x uint32) uint32 {
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// arm64:"UBFX\t[$]1, R[0-9]+, [$]30",-"LSL",-"LSR"
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return (x << 1) >> 2
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}
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func ubfx8(x uint64) uint64 {
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// arm64:"UBFX\t[$]1, R[0-9]+, [$]12",-"LSL",-"LSR",-"AND"
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// s390x:"RISBGZ\t[$]52, [$]63, [$]63,",-"SLD",-"SRD",-"AND"
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return ((x << 1) >> 2) & 0xfff
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}
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func ubfx9(x uint64) uint64 {
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// arm64:"UBFX\t[$]4, R[0-9]+, [$]11",-"LSL",-"LSR",-"AND"
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// s390x:"RISBGZ\t[$]53, [$]63, [$]60, ",-"SLD",-"SRD",-"AND"
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return ((x >> 3) & 0xfff) >> 1
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}
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func ubfx10(x uint64) uint64 {
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// arm64:"UBFX\t[$]5, R[0-9]+, [$]56",-"LSL",-"LSR"
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// s390x:"RISBGZ\t[$]8, [$]63, [$]59, ",-"SLD",-"SRD"
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return ((x >> 2) << 5) >> 8
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}
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func ubfx11(x uint64) uint64 {
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// arm64:"UBFX\t[$]1, R[0-9]+, [$]19",-"LSL",-"LSR"
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// s390x:"RISBGZ\t[$]45, [$]63, [$]63, ",-"SLD",-"SRD",-"AND"
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return ((x & 0xfffff) << 3) >> 4
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}
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// Check that we don't emit comparisons for constant shifts.
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//go:nosplit
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func shift_no_cmp(x int) int {
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// arm64:`LSL\t[$]17`,-`CMP`
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// mips64:`SLLV\t[$]17`,-`SGT`
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return x << 17
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}
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func rev16(c uint64) (uint64, uint64, uint64) {
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// arm64:`REV16`,-`AND`,-`LSR`,-`AND`,-`ORR\tR[0-9]+<<8`
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b1 := ((c & 0xff00ff00ff00ff00) >> 8) | ((c & 0x00ff00ff00ff00ff) << 8)
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// arm64:-`ADD\tR[0-9]+<<8`
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b2 := ((c & 0xff00ff00ff00ff00) >> 8) + ((c & 0x00ff00ff00ff00ff) << 8)
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// arm64:-`EOR\tR[0-9]+<<8`
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b3 := ((c & 0xff00ff00ff00ff00) >> 8) ^ ((c & 0x00ff00ff00ff00ff) << 8)
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return b1, b2, b3
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}
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func rev16w(c uint32) (uint32, uint32, uint32) {
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// arm64:`REV16W`,-`AND`,-`UBFX`,-`AND`,-`ORR\tR[0-9]+<<8`
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b1 := ((c & 0xff00ff00) >> 8) | ((c & 0x00ff00ff) << 8)
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// arm64:-`ADD\tR[0-9]+<<8`
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b2 := ((c & 0xff00ff00) >> 8) + ((c & 0x00ff00ff) << 8)
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// arm64:-`EOR\tR[0-9]+<<8`
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b3 := ((c & 0xff00ff00) >> 8) ^ ((c & 0x00ff00ff) << 8)
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return b1, b2, b3
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}
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func shift(x uint32, y uint16, z uint8) uint64 {
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// arm64:-`MOVWU`,-`LSR\t[$]32`
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a := uint64(x) >> 32
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// arm64:-`MOVHU
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b := uint64(y) >> 16
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// arm64:-`MOVBU`
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c := uint64(z) >> 8
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// arm64:`MOVD\tZR`,-`ADD\tR[0-9]+>>16`,-`ADD\tR[0-9]+>>8`,
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return a + b + c
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}
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