| // 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 |
| |
| // ------------------ // |
| // constant shifts // |
| // ------------------ // |
| |
| func lshConst64x64(v int64) int64 { |
| // ppc64x:"SLD" |
| // riscv64:"SLLI",-"AND",-"SLTIU" |
| return v << uint64(33) |
| } |
| |
| func rshConst64Ux64(v uint64) uint64 { |
| // ppc64x:"SRD" |
| // riscv64:"SRLI",-"AND",-"SLTIU" |
| return v >> uint64(33) |
| } |
| |
| func rshConst64x64(v int64) int64 { |
| // ppc64x:"SRAD" |
| // riscv64:"SRAI",-"OR",-"SLTIU" |
| return v >> uint64(33) |
| } |
| |
| func lshConst32x64(v int32) int32 { |
| // ppc64x:"SLW" |
| // riscv64:"SLLI",-"AND",-"SLTIU", -"MOVW" |
| return v << uint64(29) |
| } |
| |
| func rshConst32Ux64(v uint32) uint32 { |
| // ppc64x:"SRW" |
| // riscv64:"SRLI",-"AND",-"SLTIU", -"MOVW" |
| return v >> uint64(29) |
| } |
| |
| func rshConst32x64(v int32) int32 { |
| // ppc64x:"SRAW" |
| // riscv64:"SRAI",-"OR",-"SLTIU", -"MOVW" |
| return v >> uint64(29) |
| } |
| |
| func lshConst64x32(v int64) int64 { |
| // ppc64x:"SLD" |
| // riscv64:"SLLI",-"AND",-"SLTIU" |
| return v << uint32(33) |
| } |
| |
| func rshConst64Ux32(v uint64) uint64 { |
| // ppc64x:"SRD" |
| // riscv64:"SRLI",-"AND",-"SLTIU" |
| return v >> uint32(33) |
| } |
| |
| func rshConst64x32(v int64) int64 { |
| // ppc64x:"SRAD" |
| // riscv64:"SRAI",-"OR",-"SLTIU" |
| return v >> uint32(33) |
| } |
| |
| // ------------------ // |
| // masked shifts // |
| // ------------------ // |
| |
| func lshMask64x64(v int64, s uint64) int64 { |
| // arm64:"LSL",-"AND" |
| // ppc64x:"ANDCC",-"ORN",-"ISEL" |
| // riscv64:"SLL",-"AND\t",-"SLTIU" |
| // s390x:-"RISBGZ",-"AND",-"LOCGR" |
| return v << (s & 63) |
| } |
| |
| func rshMask64Ux64(v uint64, s uint64) uint64 { |
| // arm64:"LSR",-"AND",-"CSEL" |
| // ppc64x:"ANDCC",-"ORN",-"ISEL" |
| // riscv64:"SRL",-"AND\t",-"SLTIU" |
| // s390x:-"RISBGZ",-"AND",-"LOCGR" |
| return v >> (s & 63) |
| } |
| |
| func rshMask64x64(v int64, s uint64) int64 { |
| // arm64:"ASR",-"AND",-"CSEL" |
| // ppc64x:"ANDCC",-"ORN",-"ISEL" |
| // riscv64:"SRA",-"OR",-"SLTIU" |
| // s390x:-"RISBGZ",-"AND",-"LOCGR" |
| return v >> (s & 63) |
| } |
| |
| func lshMask32x64(v int32, s uint64) int32 { |
| // arm64:"LSL",-"AND" |
| // ppc64x:"ISEL",-"ORN" |
| // riscv64:"SLL",-"AND\t",-"SLTIU" |
| // s390x:-"RISBGZ",-"AND",-"LOCGR" |
| return v << (s & 63) |
| } |
| |
| func rshMask32Ux64(v uint32, s uint64) uint32 { |
| // arm64:"LSR",-"AND" |
| // ppc64x:"ISEL",-"ORN" |
| // riscv64:"SRL",-"AND\t",-"SLTIU" |
| // s390x:-"RISBGZ",-"AND",-"LOCGR" |
| return v >> (s & 63) |
| } |
| |
| func rshMask32x64(v int32, s uint64) int32 { |
| // arm64:"ASR",-"AND" |
| // ppc64x:"ISEL",-"ORN" |
| // riscv64:"SRA",-"OR",-"SLTIU" |
| // s390x:-"RISBGZ",-"AND",-"LOCGR" |
| return v >> (s & 63) |
| } |
| |
| func lshMask64x32(v int64, s uint32) int64 { |
| // arm64:"LSL",-"AND" |
| // ppc64x:"ANDCC",-"ORN" |
| // riscv64:"SLL",-"AND\t",-"SLTIU" |
| // s390x:-"RISBGZ",-"AND",-"LOCGR" |
| return v << (s & 63) |
| } |
| |
| func rshMask64Ux32(v uint64, s uint32) uint64 { |
| // arm64:"LSR",-"AND",-"CSEL" |
| // ppc64x:"ANDCC",-"ORN" |
| // riscv64:"SRL",-"AND\t",-"SLTIU" |
| // s390x:-"RISBGZ",-"AND",-"LOCGR" |
| return v >> (s & 63) |
| } |
| |
| func rshMask64x32(v int64, s uint32) int64 { |
| // arm64:"ASR",-"AND",-"CSEL" |
| // ppc64x:"ANDCC",-"ORN",-"ISEL" |
| // riscv64:"SRA",-"OR",-"SLTIU" |
| // s390x:-"RISBGZ",-"AND",-"LOCGR" |
| return v >> (s & 63) |
| } |
| |
| func lshMask64x32Ext(v int64, s int32) int64 { |
| // ppc64x:"ANDCC",-"ORN",-"ISEL" |
| // riscv64:"SLL",-"AND\t",-"SLTIU" |
| // s390x:-"RISBGZ",-"AND",-"LOCGR" |
| return v << uint(s&63) |
| } |
| |
| func rshMask64Ux32Ext(v uint64, s int32) uint64 { |
| // ppc64x:"ANDCC",-"ORN",-"ISEL" |
| // riscv64:"SRL",-"AND\t",-"SLTIU" |
| // s390x:-"RISBGZ",-"AND",-"LOCGR" |
| return v >> uint(s&63) |
| } |
| |
| func rshMask64x32Ext(v int64, s int32) int64 { |
| // ppc64x:"ANDCC",-"ORN",-"ISEL" |
| // riscv64:"SRA",-"OR",-"SLTIU" |
| // s390x:-"RISBGZ",-"AND",-"LOCGR" |
| return v >> uint(s&63) |
| } |
| |
| // --------------- // |
| // signed shifts // |
| // --------------- // |
| |
| // We do want to generate a test + panicshift for these cases. |
| func lshSigned(v8 int8, v16 int16, v32 int32, v64 int64, x int) { |
| // amd64:"TESTB" |
| _ = x << v8 |
| // amd64:"TESTW" |
| _ = x << v16 |
| // amd64:"TESTL" |
| _ = x << v32 |
| // amd64:"TESTQ" |
| _ = x << v64 |
| } |
| |
| // We want to avoid generating a test + panicshift for these cases. |
| func lshSignedMasked(v8 int8, v16 int16, v32 int32, v64 int64, x int) { |
| // amd64:-"TESTB" |
| _ = x << (v8 & 7) |
| // amd64:-"TESTW" |
| _ = x << (v16 & 15) |
| // amd64:-"TESTL" |
| _ = x << (v32 & 31) |
| // amd64:-"TESTQ" |
| _ = x << (v64 & 63) |
| } |
| |
| // ------------------ // |
| // bounded shifts // |
| // ------------------ // |
| |
| func lshGuarded64(v int64, s uint) int64 { |
| if s < 64 { |
| // riscv64:"SLL",-"AND",-"SLTIU" |
| // s390x:-"RISBGZ",-"AND",-"LOCGR" |
| // wasm:-"Select",-".*LtU" |
| // arm64:"LSL",-"CSEL" |
| return v << s |
| } |
| panic("shift too large") |
| } |
| |
| func rshGuarded64U(v uint64, s uint) uint64 { |
| if s < 64 { |
| // riscv64:"SRL",-"AND",-"SLTIU" |
| // s390x:-"RISBGZ",-"AND",-"LOCGR" |
| // wasm:-"Select",-".*LtU" |
| // arm64:"LSR",-"CSEL" |
| return v >> s |
| } |
| panic("shift too large") |
| } |
| |
| func rshGuarded64(v int64, s uint) int64 { |
| if s < 64 { |
| // riscv64:"SRA",-"OR",-"SLTIU" |
| // s390x:-"RISBGZ",-"AND",-"LOCGR" |
| // wasm:-"Select",-".*LtU" |
| // arm64:"ASR",-"CSEL" |
| return v >> s |
| } |
| panic("shift too large") |
| } |
| |
| func provedUnsignedShiftLeft(val64 uint64, val32 uint32, val16 uint16, val8 uint8, shift int) (r1 uint64, r2 uint32, r3 uint16, r4 uint8) { |
| if shift >= 0 && shift < 64 { |
| // arm64:"LSL",-"CSEL" |
| r1 = val64 << shift |
| } |
| if shift >= 0 && shift < 32 { |
| // arm64:"LSL",-"CSEL" |
| r2 = val32 << shift |
| } |
| if shift >= 0 && shift < 16 { |
| // arm64:"LSL",-"CSEL" |
| r3 = val16 << shift |
| } |
| if shift >= 0 && shift < 8 { |
| // arm64:"LSL",-"CSEL" |
| r4 = val8 << shift |
| } |
| return r1, r2, r3, r4 |
| } |
| |
| func provedSignedShiftLeft(val64 int64, val32 int32, val16 int16, val8 int8, shift int) (r1 int64, r2 int32, r3 int16, r4 int8) { |
| if shift >= 0 && shift < 64 { |
| // arm64:"LSL",-"CSEL" |
| r1 = val64 << shift |
| } |
| if shift >= 0 && shift < 32 { |
| // arm64:"LSL",-"CSEL" |
| r2 = val32 << shift |
| } |
| if shift >= 0 && shift < 16 { |
| // arm64:"LSL",-"CSEL" |
| r3 = val16 << shift |
| } |
| if shift >= 0 && shift < 8 { |
| // arm64:"LSL",-"CSEL" |
| r4 = val8 << shift |
| } |
| return r1, r2, r3, r4 |
| } |
| |
| func provedUnsignedShiftRight(val64 uint64, val32 uint32, val16 uint16, val8 uint8, shift int) (r1 uint64, r2 uint32, r3 uint16, r4 uint8) { |
| if shift >= 0 && shift < 64 { |
| // arm64:"LSR",-"CSEL" |
| r1 = val64 >> shift |
| } |
| if shift >= 0 && shift < 32 { |
| // arm64:"LSR",-"CSEL" |
| r2 = val32 >> shift |
| } |
| if shift >= 0 && shift < 16 { |
| // arm64:"LSR",-"CSEL" |
| r3 = val16 >> shift |
| } |
| if shift >= 0 && shift < 8 { |
| // arm64:"LSR",-"CSEL" |
| r4 = val8 >> shift |
| } |
| return r1, r2, r3, r4 |
| } |
| |
| func provedSignedShiftRight(val64 int64, val32 int32, val16 int16, val8 int8, shift int) (r1 int64, r2 int32, r3 int16, r4 int8) { |
| if shift >= 0 && shift < 64 { |
| // arm64:"ASR",-"CSEL" |
| r1 = val64 >> shift |
| } |
| if shift >= 0 && shift < 32 { |
| // arm64:"ASR",-"CSEL" |
| r2 = val32 >> shift |
| } |
| if shift >= 0 && shift < 16 { |
| // arm64:"ASR",-"CSEL" |
| r3 = val16 >> shift |
| } |
| if shift >= 0 && shift < 8 { |
| // arm64:"ASR",-"CSEL" |
| r4 = val8 >> shift |
| } |
| return r1, r2, r3, r4 |
| } |
| |
| func checkUnneededTrunc(tab *[100000]uint32, d uint64, v uint32, h uint16, b byte) (uint32, uint64) { |
| |
| // ppc64x:-".*RLWINM",-".*RLDICR",".*CLRLSLDI" |
| f := tab[byte(v)^b] |
| // ppc64x:-".*RLWINM",-".*RLDICR",".*CLRLSLDI" |
| f += tab[byte(v)&b] |
| // ppc64x:-".*RLWINM",-".*RLDICR",".*CLRLSLDI" |
| f += tab[byte(v)|b] |
| // ppc64x:-".*RLWINM",-".*RLDICR",".*CLRLSLDI" |
| f += tab[uint16(v)&h] |
| // ppc64x:-".*RLWINM",-".*RLDICR",".*CLRLSLDI" |
| f += tab[uint16(v)^h] |
| // ppc64x:-".*RLWINM",-".*RLDICR",".*CLRLSLDI" |
| f += tab[uint16(v)|h] |
| // ppc64x:-".*AND",-"RLDICR",".*CLRLSLDI" |
| f += tab[v&0xff] |
| // ppc64x:-".*AND",".*CLRLSLWI" |
| f += 2 * uint32(uint16(d)) |
| // ppc64x:-".*AND",-"RLDICR",".*CLRLSLDI" |
| g := 2 * uint64(uint32(d)) |
| return f, g |
| } |
| |
| func checkCombinedShifts(v8 uint8, v16 uint16, v32 uint32, x32 int32, v64 uint64) (uint8, uint16, uint32, uint64, int64) { |
| |
| // ppc64x:-"AND","CLRLSLWI" |
| f := (v8 & 0xF) << 2 |
| // ppc64x:"CLRLSLWI" |
| f += byte(v16) << 3 |
| // ppc64x:-"AND","CLRLSLWI" |
| g := (v16 & 0xFF) << 3 |
| // ppc64x:-"AND","CLRLSLWI" |
| h := (v32 & 0xFFFFF) << 2 |
| // ppc64x:"CLRLSLDI" |
| i := (v64 & 0xFFFFFFFF) << 5 |
| // ppc64x:-"CLRLSLDI" |
| i += (v64 & 0xFFFFFFF) << 38 |
| // ppc64x/power9:-"CLRLSLDI" |
| i += (v64 & 0xFFFF00) << 10 |
| // ppc64x/power9:-"SLD","EXTSWSLI" |
| j := int64(x32+32) * 8 |
| return f, g, h, i, j |
| } |
| |
| func checkWidenAfterShift(v int64, u uint64) (int64, uint64) { |
| |
| // ppc64x:-".*MOVW" |
| f := int32(v >> 32) |
| // ppc64x:".*MOVW" |
| f += int32(v >> 31) |
| // ppc64x:-".*MOVH" |
| g := int16(v >> 48) |
| // ppc64x:".*MOVH" |
| g += int16(v >> 30) |
| // ppc64x:-".*MOVH" |
| g += int16(f >> 16) |
| // ppc64x:-".*MOVB" |
| h := int8(v >> 56) |
| // ppc64x:".*MOVB" |
| h += int8(v >> 28) |
| // ppc64x:-".*MOVB" |
| h += int8(f >> 24) |
| // ppc64x:".*MOVB" |
| h += int8(f >> 16) |
| return int64(h), uint64(g) |
| } |
| |
| func checkShiftAndMask32(v []uint32) { |
| i := 0 |
| |
| // ppc64x: "RLWNM\t[$]24, R[0-9]+, [$]12, [$]19, R[0-9]+" |
| v[i] = (v[i] & 0xFF00000) >> 8 |
| i++ |
| // ppc64x: "RLWNM\t[$]26, R[0-9]+, [$]22, [$]29, R[0-9]+" |
| v[i] = (v[i] & 0xFF00) >> 6 |
| i++ |
| // ppc64x: "MOVW\tR0" |
| v[i] = (v[i] & 0xFF) >> 8 |
| i++ |
| // ppc64x: "MOVW\tR0" |
| v[i] = (v[i] & 0xF000000) >> 28 |
| i++ |
| // ppc64x: "RLWNM\t[$]26, R[0-9]+, [$]24, [$]31, R[0-9]+" |
| v[i] = (v[i] >> 6) & 0xFF |
| i++ |
| // ppc64x: "RLWNM\t[$]26, R[0-9]+, [$]12, [$]19, R[0-9]+" |
| v[i] = (v[i] >> 6) & 0xFF000 |
| i++ |
| // ppc64x: "MOVW\tR0" |
| v[i] = (v[i] >> 20) & 0xFF000 |
| i++ |
| // ppc64x: "MOVW\tR0" |
| v[i] = (v[i] >> 24) & 0xFF00 |
| i++ |
| } |
| |
| func checkMergedShifts32(a [256]uint32, b [256]uint64, u uint32, v uint32) { |
| // ppc64x: -"CLRLSLDI", "RLWNM\t[$]10, R[0-9]+, [$]22, [$]29, R[0-9]+" |
| a[0] = a[uint8(v>>24)] |
| // ppc64x: -"CLRLSLDI", "RLWNM\t[$]11, R[0-9]+, [$]21, [$]28, R[0-9]+" |
| b[0] = b[uint8(v>>24)] |
| // ppc64x: -"CLRLSLDI", "RLWNM\t[$]15, R[0-9]+, [$]21, [$]28, R[0-9]+" |
| b[1] = b[(v>>20)&0xFF] |
| // ppc64x: -"SLD", "RLWNM\t[$]10, R[0-9]+, [$]22, [$]28, R[0-9]+" |
| b[2] = b[v>>25] |
| } |
| |
| // 128 bit shifts |
| |
| func check128bitShifts(x, y uint64, bits uint) (uint64, uint64) { |
| s := bits & 63 |
| ŝ := (64 - bits) & 63 |
| // check that the shift operation has two commas (three operands) |
| // amd64:"SHRQ.*,.*," |
| shr := x>>s | y<<ŝ |
| // amd64:"SHLQ.*,.*," |
| shl := x<<s | y>>ŝ |
| return shr, shl |
| } |
| |
| func checkShiftToMask(u []uint64, s []int64) { |
| // amd64:-"SHR",-"SHL","ANDQ" |
| u[0] = u[0] >> 5 << 5 |
| // amd64:-"SAR",-"SHL","ANDQ" |
| s[0] = s[0] >> 5 << 5 |
| // amd64:-"SHR",-"SHL","ANDQ" |
| u[1] = u[1] << 5 >> 5 |
| } |
