mirror of
https://github.com/golang/go
synced 2024-11-18 01:24:49 -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
|
|
|
|
// 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 codegen tests related to bit field
|
|
// insertion/extraction simplifications/optimizations.
|
|
|
|
func extr1(x, x2 uint64) uint64 {
|
|
return x<<7 + x2>>57 // arm64:"EXTR\t[$]57,"
|
|
}
|
|
|
|
func extr2(x, x2 uint64) uint64 {
|
|
return x<<7 | x2>>57 // arm64:"EXTR\t[$]57,"
|
|
}
|
|
|
|
func extr3(x, x2 uint64) uint64 {
|
|
return x<<7 ^ x2>>57 // arm64:"EXTR\t[$]57,"
|
|
}
|
|
|
|
func extr4(x, x2 uint32) uint32 {
|
|
return x<<7 + x2>>25 // arm64:"EXTRW\t[$]25,"
|
|
}
|
|
|
|
func extr5(x, x2 uint32) uint32 {
|
|
return x<<7 | x2>>25 // arm64:"EXTRW\t[$]25,"
|
|
}
|
|
|
|
func extr6(x, x2 uint32) uint32 {
|
|
return x<<7 ^ x2>>25 // arm64:"EXTRW\t[$]25,"
|
|
}
|
|
|
|
// check 32-bit shift masking
|
|
func mask32(x uint32) uint32 {
|
|
return (x << 29) >> 29 // arm64:"AND\t[$]7, R[0-9]+",-"LSR",-"LSL"
|
|
}
|
|
|
|
// check 16-bit shift masking
|
|
func mask16(x uint16) uint16 {
|
|
return (x << 14) >> 14 // arm64:"AND\t[$]3, R[0-9]+",-"LSR",-"LSL"
|
|
}
|
|
|
|
// check 8-bit shift masking
|
|
func mask8(x uint8) uint8 {
|
|
return (x << 7) >> 7 // arm64:"AND\t[$]1, R[0-9]+",-"LSR",-"LSL"
|
|
}
|
|
|
|
func maskshift(x uint64) uint64 {
|
|
// arm64:"AND\t[$]4095, R[0-9]+",-"LSL",-"LSR",-"UBFIZ",-"UBFX"
|
|
return ((x << 5) & (0xfff << 5)) >> 5
|
|
}
|
|
|
|
// bitfield ops
|
|
// bfi
|
|
func bfi1(x, y uint64) uint64 {
|
|
// arm64:"BFI\t[$]4, R[0-9]+, [$]12",-"LSL",-"LSR",-"AND"
|
|
return ((x & 0xfff) << 4) | (y & 0xffffffffffff000f)
|
|
}
|
|
|
|
func bfi2(x, y uint64) uint64 {
|
|
// arm64:"BFI\t[$]12, R[0-9]+, [$]40",-"LSL",-"LSR",-"AND"
|
|
return (x << 24 >> 12) | (y & 0xfff0000000000fff)
|
|
}
|
|
|
|
// bfxil
|
|
func bfxil1(x, y uint64) uint64 {
|
|
// arm64:"BFXIL\t[$]5, R[0-9]+, [$]12",-"LSL",-"LSR",-"AND"
|
|
return ((x >> 5) & 0xfff) | (y & 0xfffffffffffff000)
|
|
}
|
|
|
|
func bfxil2(x, y uint64) uint64 {
|
|
// arm64:"BFXIL\t[$]12, R[0-9]+, [$]40",-"LSL",-"LSR",-"AND"
|
|
return (x << 12 >> 24) | (y & 0xffffff0000000000)
|
|
}
|
|
|
|
// sbfiz
|
|
func sbfiz1(x int64) int64 {
|
|
// arm64:"SBFIZ\t[$]1, R[0-9]+, [$]60",-"LSL",-"ASR"
|
|
return (x << 4) >> 3
|
|
}
|
|
|
|
func sbfiz2(x int32) int64 {
|
|
return int64(x << 3) // arm64:"SBFIZ\t[$]3, R[0-9]+, [$]29",-"LSL"
|
|
}
|
|
|
|
func sbfiz3(x int16) int64 {
|
|
return int64(x << 3) // arm64:"SBFIZ\t[$]3, R[0-9]+, [$]13",-"LSL"
|
|
}
|
|
|
|
func sbfiz4(x int8) int64 {
|
|
return int64(x << 3) // arm64:"SBFIZ\t[$]3, R[0-9]+, [$]5",-"LSL"
|
|
}
|
|
|
|
func sbfiz5(x int32) int32 {
|
|
// arm64:"SBFIZ\t[$]1, R[0-9]+, [$]28",-"LSL",-"ASR"
|
|
return (x << 4) >> 3
|
|
}
|
|
|
|
// sbfx
|
|
func sbfx1(x int64) int64 {
|
|
return (x << 3) >> 4 // arm64:"SBFX\t[$]1, R[0-9]+, [$]60",-"LSL",-"ASR"
|
|
}
|
|
|
|
func sbfx2(x int64) int64 {
|
|
return (x << 60) >> 60 // arm64:"SBFX\tZR, R[0-9]+, [$]4",-"LSL",-"ASR"
|
|
}
|
|
|
|
func sbfx3(x int32) int64 {
|
|
return int64(x) >> 3 // arm64:"SBFX\t[$]3, R[0-9]+, [$]29",-"ASR"
|
|
}
|
|
|
|
func sbfx4(x int16) int64 {
|
|
return int64(x) >> 3 // arm64:"SBFX\t[$]3, R[0-9]+, [$]13",-"ASR"
|
|
}
|
|
|
|
func sbfx5(x int8) int64 {
|
|
return int64(x) >> 3 // arm64:"SBFX\t[$]3, R[0-9]+, [$]5",-"ASR"
|
|
}
|
|
|
|
func sbfx6(x int32) int32 {
|
|
return (x << 3) >> 4 // arm64:"SBFX\t[$]1, R[0-9]+, [$]28",-"LSL",-"ASR"
|
|
}
|
|
|
|
// ubfiz
|
|
func ubfiz1(x uint64) uint64 {
|
|
// arm64:"UBFIZ\t[$]3, R[0-9]+, [$]12",-"LSL",-"AND"
|
|
// s390x:"RISBGZ\t[$]49, [$]60, [$]3,",-"SLD",-"AND"
|
|
return (x & 0xfff) << 3
|
|
}
|
|
|
|
func ubfiz2(x uint64) uint64 {
|
|
// arm64:"UBFIZ\t[$]4, R[0-9]+, [$]12",-"LSL",-"AND"
|
|
// s390x:"RISBGZ\t[$]48, [$]59, [$]4,",-"SLD",-"AND"
|
|
return (x << 4) & 0xfff0
|
|
}
|
|
|
|
func ubfiz3(x uint32) uint64 {
|
|
return uint64(x+1) << 3 // arm64:"UBFIZ\t[$]3, R[0-9]+, [$]32",-"LSL"
|
|
}
|
|
|
|
func ubfiz4(x uint16) uint64 {
|
|
return uint64(x+1) << 3 // arm64:"UBFIZ\t[$]3, R[0-9]+, [$]16",-"LSL"
|
|
}
|
|
|
|
func ubfiz5(x uint8) uint64 {
|
|
return uint64(x+1) << 3 // arm64:"UBFIZ\t[$]3, R[0-9]+, [$]8",-"LSL"
|
|
}
|
|
|
|
func ubfiz6(x uint64) uint64 {
|
|
// arm64:"UBFIZ\t[$]1, R[0-9]+, [$]60",-"LSL",-"LSR"
|
|
// s390x:"RISBGZ\t[$]3, [$]62, [$]1, ",-"SLD",-"SRD"
|
|
return (x << 4) >> 3
|
|
}
|
|
|
|
func ubfiz7(x uint32) uint32 {
|
|
// arm64:"UBFIZ\t[$]1, R[0-9]+, [$]28",-"LSL",-"LSR"
|
|
return (x << 4) >> 3
|
|
}
|
|
|
|
func ubfiz8(x uint64) uint64 {
|
|
// arm64:"UBFIZ\t[$]1, R[0-9]+, [$]20",-"LSL",-"LSR"
|
|
// s390x:"RISBGZ\t[$]43, [$]62, [$]1, ",-"SLD",-"SRD",-"AND"
|
|
return ((x & 0xfffff) << 4) >> 3
|
|
}
|
|
|
|
func ubfiz9(x uint64) uint64 {
|
|
// arm64:"UBFIZ\t[$]5, R[0-9]+, [$]13",-"LSL",-"LSR",-"AND"
|
|
return ((x << 3) & 0xffff) << 2
|
|
}
|
|
|
|
func ubfiz10(x uint64) uint64 {
|
|
// arm64:"UBFIZ\t[$]7, R[0-9]+, [$]12",-"LSL",-"LSR",-"AND"
|
|
// s390x:"RISBGZ\t[$]45, [$]56, [$]7, ",-"SLD",-"SRD",-"AND"
|
|
return ((x << 5) & (0xfff << 5)) << 2
|
|
}
|
|
|
|
// ubfx
|
|
func ubfx1(x uint64) uint64 {
|
|
// arm64:"UBFX\t[$]25, R[0-9]+, [$]10",-"LSR",-"AND"
|
|
// s390x:"RISBGZ\t[$]54, [$]63, [$]39, ",-"SRD",-"AND"
|
|
return (x >> 25) & 1023
|
|
}
|
|
|
|
func ubfx2(x uint64) uint64 {
|
|
// arm64:"UBFX\t[$]4, R[0-9]+, [$]8",-"LSR",-"AND"
|
|
// s390x:"RISBGZ\t[$]56, [$]63, [$]60, ",-"SRD",-"AND"
|
|
return (x & 0x0ff0) >> 4
|
|
}
|
|
|
|
func ubfx3(x uint32) uint64 {
|
|
return uint64(x >> 15) // arm64:"UBFX\t[$]15, R[0-9]+, [$]17",-"LSR"
|
|
}
|
|
|
|
func ubfx4(x uint16) uint64 {
|
|
return uint64(x >> 9) // arm64:"UBFX\t[$]9, R[0-9]+, [$]7",-"LSR"
|
|
}
|
|
|
|
func ubfx5(x uint8) uint64 {
|
|
return uint64(x >> 3) // arm64:"UBFX\t[$]3, R[0-9]+, [$]5",-"LSR"
|
|
}
|
|
|
|
func ubfx6(x uint64) uint64 {
|
|
// arm64:"UBFX\t[$]1, R[0-9]+, [$]62",-"LSL",-"LSR"
|
|
// s390x:"RISBGZ\t[$]2, [$]63, [$]63,",-"SLD",-"SRD"
|
|
return (x << 1) >> 2
|
|
}
|
|
|
|
func ubfx7(x uint32) uint32 {
|
|
// arm64:"UBFX\t[$]1, R[0-9]+, [$]30",-"LSL",-"LSR"
|
|
return (x << 1) >> 2
|
|
}
|
|
|
|
func ubfx8(x uint64) uint64 {
|
|
// arm64:"UBFX\t[$]1, R[0-9]+, [$]12",-"LSL",-"LSR",-"AND"
|
|
// s390x:"RISBGZ\t[$]52, [$]63, [$]63,",-"SLD",-"SRD",-"AND"
|
|
return ((x << 1) >> 2) & 0xfff
|
|
}
|
|
|
|
func ubfx9(x uint64) uint64 {
|
|
// arm64:"UBFX\t[$]4, R[0-9]+, [$]11",-"LSL",-"LSR",-"AND"
|
|
// s390x:"RISBGZ\t[$]53, [$]63, [$]60, ",-"SLD",-"SRD",-"AND"
|
|
return ((x >> 3) & 0xfff) >> 1
|
|
}
|
|
|
|
func ubfx10(x uint64) uint64 {
|
|
// arm64:"UBFX\t[$]5, R[0-9]+, [$]56",-"LSL",-"LSR"
|
|
// s390x:"RISBGZ\t[$]8, [$]63, [$]59, ",-"SLD",-"SRD"
|
|
return ((x >> 2) << 5) >> 8
|
|
}
|
|
|
|
func ubfx11(x uint64) uint64 {
|
|
// arm64:"UBFX\t[$]1, R[0-9]+, [$]19",-"LSL",-"LSR"
|
|
// s390x:"RISBGZ\t[$]45, [$]63, [$]63, ",-"SLD",-"SRD",-"AND"
|
|
return ((x & 0xfffff) << 3) >> 4
|
|
}
|
|
|
|
// Check that we don't emit comparisons for constant shifts.
|
|
//go:nosplit
|
|
func shift_no_cmp(x int) int {
|
|
// arm64:`LSL\t[$]17`,-`CMP`
|
|
// mips64:`SLLV\t[$]17`,-`SGT`
|
|
return x << 17
|
|
}
|
|
|
|
func rev16(c uint64) (uint64, uint64, uint64) {
|
|
// arm64:`REV16`,-`AND`,-`LSR`,-`AND`,-`ORR\tR[0-9]+<<8`
|
|
b1 := ((c & 0xff00ff00ff00ff00) >> 8) | ((c & 0x00ff00ff00ff00ff) << 8)
|
|
// arm64:-`ADD\tR[0-9]+<<8`
|
|
b2 := ((c & 0xff00ff00ff00ff00) >> 8) + ((c & 0x00ff00ff00ff00ff) << 8)
|
|
// arm64:-`EOR\tR[0-9]+<<8`
|
|
b3 := ((c & 0xff00ff00ff00ff00) >> 8) ^ ((c & 0x00ff00ff00ff00ff) << 8)
|
|
return b1, b2, b3
|
|
}
|
|
|
|
func rev16w(c uint32) (uint32, uint32, uint32) {
|
|
// arm64:`REV16W`,-`AND`,-`UBFX`,-`AND`,-`ORR\tR[0-9]+<<8`
|
|
b1 := ((c & 0xff00ff00) >> 8) | ((c & 0x00ff00ff) << 8)
|
|
// arm64:-`ADD\tR[0-9]+<<8`
|
|
b2 := ((c & 0xff00ff00) >> 8) + ((c & 0x00ff00ff) << 8)
|
|
// arm64:-`EOR\tR[0-9]+<<8`
|
|
b3 := ((c & 0xff00ff00) >> 8) ^ ((c & 0x00ff00ff) << 8)
|
|
return b1, b2, b3
|
|
}
|
|
|
|
func shift(x uint32, y uint16, z uint8) uint64 {
|
|
// arm64:-`MOVWU`,-`LSR\t[$]32`
|
|
a := uint64(x) >> 32
|
|
// arm64:-`MOVHU
|
|
b := uint64(y) >> 16
|
|
// arm64:-`MOVBU`
|
|
c := uint64(z) >> 8
|
|
// arm64:`MOVD\tZR`,-`ADD\tR[0-9]+>>16`,-`ADD\tR[0-9]+>>8`,
|
|
return a + b + c
|
|
}
|