| // 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 |
| // merge shifts into sbfiz: (x << lc) >> rc && lc > rc. |
| func sbfiz1(x int64) int64 { |
| // arm64:"SBFIZ\t[$]1, R[0-9]+, [$]60",-"LSL",-"ASR" |
| return (x << 4) >> 3 |
| } |
| |
| // merge shift and sign-extension into sbfiz. |
| 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" |
| } |
| |
| // sbfiz combinations. |
| // merge shift with sbfiz into sbfiz. |
| func sbfiz5(x int32) int32 { |
| // arm64:"SBFIZ\t[$]1, R[0-9]+, [$]28",-"LSL",-"ASR" |
| return (x << 4) >> 3 |
| } |
| |
| func sbfiz6(x int16) int64 { |
| return int64(x+1) << 3 // arm64:"SBFIZ\t[$]3, R[0-9]+, [$]16",-"LSL" |
| } |
| |
| func sbfiz7(x int8) int64 { |
| return int64(x+1) << 62 // arm64:"SBFIZ\t[$]62, R[0-9]+, [$]2",-"LSL" |
| } |
| |
| func sbfiz8(x int32) int64 { |
| return int64(x+1) << 40 // arm64:"SBFIZ\t[$]40, R[0-9]+, [$]24",-"LSL" |
| } |
| |
| // sbfx |
| // merge shifts into sbfx: (x << lc) >> rc && lc <= rc. |
| 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\t[$]0, R[0-9]+, [$]4",-"LSL",-"ASR" |
| } |
| |
| // merge shift and sign-extension into sbfx. |
| 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) int64 { |
| return int64(x >> 30) // arm64:"SBFX\t[$]30, R[0-9]+, [$]2" |
| } |
| |
| func sbfx7(x int16) int64 { |
| return int64(x >> 10) // arm64:"SBFX\t[$]10, R[0-9]+, [$]6" |
| } |
| |
| func sbfx8(x int8) int64 { |
| return int64(x >> 5) // arm64:"SBFX\t[$]5, R[0-9]+, [$]3" |
| } |
| |
| // sbfx combinations. |
| // merge shifts with sbfiz into sbfx. |
| func sbfx9(x int32) int32 { |
| return (x << 3) >> 4 // arm64:"SBFX\t[$]1, R[0-9]+, [$]28",-"LSL",-"ASR" |
| } |
| |
| // merge sbfx and sign-extension into sbfx. |
| func sbfx10(x int32) int64 { |
| c := x + 5 |
| return int64(c >> 20) // arm64"SBFX\t[$]20, R[0-9]+, [$]12",-"MOVW\tR[0-9]+, R[0-9]+" |
| } |
| |
| // ubfiz |
| // merge shifts into ubfiz: (x<<lc)>>rc && lc>rc |
| func ubfiz1(x uint64) uint64 { |
| // arm64:"UBFIZ\t[$]1, R[0-9]+, [$]60",-"LSL",-"LSR" |
| // s390x:"RISBGZ\t[$]3, [$]62, [$]1, ",-"SLD",-"SRD" |
| return (x << 4) >> 3 |
| } |
| |
| // merge shift and zero-extension into ubfiz. |
| func ubfiz2(x uint32) uint64 { |
| return uint64(x+1) << 3 // arm64:"UBFIZ\t[$]3, R[0-9]+, [$]32",-"LSL" |
| } |
| |
| func ubfiz3(x uint16) uint64 { |
| return uint64(x+1) << 3 // arm64:"UBFIZ\t[$]3, R[0-9]+, [$]16",-"LSL" |
| } |
| |
| func ubfiz4(x uint8) uint64 { |
| return uint64(x+1) << 3 // arm64:"UBFIZ\t[$]3, R[0-9]+, [$]8",-"LSL" |
| } |
| |
| func ubfiz5(x uint8) uint64 { |
| return uint64(x) << 60 // arm64:"UBFIZ\t[$]60, R[0-9]+, [$]4",-"LSL" |
| } |
| |
| func ubfiz6(x uint32) uint64 { |
| return uint64(x << 30) // arm64:"UBFIZ\t[$]30, R[0-9]+, [$]2", |
| } |
| |
| func ubfiz7(x uint16) uint64 { |
| return uint64(x << 10) // arm64:"UBFIZ\t[$]10, R[0-9]+, [$]6", |
| } |
| |
| func ubfiz8(x uint8) uint64 { |
| return uint64(x << 7) // arm64:"UBFIZ\t[$]7, R[0-9]+, [$]1", |
| } |
| |
| // merge ANDconst into ubfiz. |
| func ubfiz9(x uint64) uint64 { |
| // arm64:"UBFIZ\t[$]3, R[0-9]+, [$]12",-"LSL",-"AND" |
| // s390x:"RISBGZ\t[$]49, [$]60, [$]3,",-"SLD",-"AND" |
| return (x & 0xfff) << 3 |
| } |
| |
| func ubfiz10(x uint64) uint64 { |
| // arm64:"UBFIZ\t[$]4, R[0-9]+, [$]12",-"LSL",-"AND" |
| // s390x:"RISBGZ\t[$]48, [$]59, [$]4,",-"SLD",-"AND" |
| return (x << 4) & 0xfff0 |
| } |
| |
| // ubfiz combinations |
| func ubfiz11(x uint32) uint32 { |
| // arm64:"UBFIZ\t[$]1, R[0-9]+, [$]28",-"LSL",-"LSR" |
| return (x << 4) >> 3 |
| } |
| |
| func ubfiz12(x uint64) uint64 { |
| // arm64:"UBFIZ\t[$]1, R[0-9]+, [$]20",-"LSL",-"LSR" |
| // s390x:"RISBGZ\t[$]43, [$]62, [$]1, ",-"SLD",-"SRD",-"AND" |
| return ((x & 0xfffff) << 4) >> 3 |
| } |
| |
| func ubfiz13(x uint64) uint64 { |
| // arm64:"UBFIZ\t[$]5, R[0-9]+, [$]13",-"LSL",-"LSR",-"AND" |
| return ((x << 3) & 0xffff) << 2 |
| } |
| |
| func ubfiz14(x uint64) uint64 { |
| // arm64:"UBFIZ\t[$]7, R[0-9]+, [$]12",-"LSL",-"LSR",-"AND" |
| // s390x:"RISBGZ\t[$]45, [$]56, [$]7, ",-"SLD",-"SRD",-"AND" |
| return ((x << 5) & (0xfff << 5)) << 2 |
| } |
| |
| // ubfx |
| // merge shifts into ubfx: (x<<lc)>>rc && lc<rc |
| func ubfx1(x uint64) uint64 { |
| // arm64:"UBFX\t[$]1, R[0-9]+, [$]62",-"LSL",-"LSR" |
| // s390x:"RISBGZ\t[$]2, [$]63, [$]63,",-"SLD",-"SRD" |
| return (x << 1) >> 2 |
| } |
| |
| // merge shift and zero-extension into ubfx. |
| func ubfx2(x uint32) uint64 { |
| return uint64(x >> 15) // arm64:"UBFX\t[$]15, R[0-9]+, [$]17",-"LSR" |
| } |
| |
| func ubfx3(x uint16) uint64 { |
| return uint64(x >> 9) // arm64:"UBFX\t[$]9, R[0-9]+, [$]7",-"LSR" |
| } |
| |
| func ubfx4(x uint8) uint64 { |
| return uint64(x >> 3) // arm64:"UBFX\t[$]3, R[0-9]+, [$]5",-"LSR" |
| } |
| |
| func ubfx5(x uint32) uint64 { |
| return uint64(x) >> 30 // arm64:"UBFX\t[$]30, R[0-9]+, [$]2" |
| } |
| |
| func ubfx6(x uint16) uint64 { |
| return uint64(x) >> 10 // arm64:"UBFX\t[$]10, R[0-9]+, [$]6" |
| } |
| |
| func ubfx7(x uint8) uint64 { |
| return uint64(x) >> 3 // arm64:"UBFX\t[$]3, R[0-9]+, [$]5" |
| } |
| |
| // merge ANDconst into ubfx. |
| func ubfx8(x uint64) uint64 { |
| // arm64:"UBFX\t[$]25, R[0-9]+, [$]10",-"LSR",-"AND" |
| // s390x:"RISBGZ\t[$]54, [$]63, [$]39, ",-"SRD",-"AND" |
| return (x >> 25) & 1023 |
| } |
| |
| func ubfx9(x uint64) uint64 { |
| // arm64:"UBFX\t[$]4, R[0-9]+, [$]8",-"LSR",-"AND" |
| // s390x:"RISBGZ\t[$]56, [$]63, [$]60, ",-"SRD",-"AND" |
| return (x & 0x0ff0) >> 4 |
| } |
| |
| // ubfx combinations. |
| func ubfx10(x uint32) uint32 { |
| // arm64:"UBFX\t[$]1, R[0-9]+, [$]30",-"LSL",-"LSR" |
| return (x << 1) >> 2 |
| } |
| |
| func ubfx11(x uint64) uint64 { |
| // arm64:"UBFX\t[$]1, R[0-9]+, [$]12",-"LSL",-"LSR",-"AND" |
| // s390x:"RISBGZ\t[$]52, [$]63, [$]63,",-"SLD",-"SRD",-"AND" |
| return ((x << 1) >> 2) & 0xfff |
| } |
| |
| func ubfx12(x uint64) uint64 { |
| // arm64:"UBFX\t[$]4, R[0-9]+, [$]11",-"LSL",-"LSR",-"AND" |
| // s390x:"RISBGZ\t[$]53, [$]63, [$]60, ",-"SLD",-"SRD",-"AND" |
| return ((x >> 3) & 0xfff) >> 1 |
| } |
| |
| func ubfx13(x uint64) uint64 { |
| // arm64:"UBFX\t[$]5, R[0-9]+, [$]56",-"LSL",-"LSR" |
| // s390x:"RISBGZ\t[$]8, [$]63, [$]59, ",-"SLD",-"SRD" |
| return ((x >> 2) << 5) >> 8 |
| } |
| |
| func ubfx14(x uint64) uint64 { |
| // arm64:"UBFX\t[$]1, R[0-9]+, [$]19",-"LSL",-"LSR" |
| // s390x:"RISBGZ\t[$]45, [$]63, [$]63, ",-"SLD",-"SRD",-"AND" |
| return ((x & 0xfffff) << 3) >> 4 |
| } |
| |
| // merge ubfx and zero-extension into ubfx. |
| func ubfx15(x uint64) bool { |
| midr := x + 10 |
| part_num := uint16((midr >> 4) & 0xfff) |
| if part_num == 0xd0c { // arm64:"UBFX\t[$]4, R[0-9]+, [$]12",-"MOVHU\tR[0-9]+, R[0-9]+" |
| return true |
| } |
| return false |
| } |
| |
| // merge ANDconst and ubfx into ubfx |
| func ubfx16(x uint64) uint64 { |
| // arm64:"UBFX\t[$]4, R[0-9]+, [$]6",-"AND\t[$]63" |
| return ((x >> 3) & 0xfff) >> 1 & 0x3f |
| } |
| |
| // Check that we don't emit comparisons for constant shifts. |
| // |
| //go:nosplit |
| func shift_no_cmp(x int) int { |
| // arm64:`LSL\t[$]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 |
| } |
