| // 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 |
| |
| import "math/bits" |
| |
| // ----------------------- // |
| // bits.LeadingZeros // |
| // ----------------------- // |
| |
| func LeadingZeros(n uint) int { |
| // amd64:"BSRQ" |
| // s390x:"FLOGR" |
| // arm:"CLZ" arm64:"CLZ" |
| // mips:"CLZ" |
| // wasm:"I64Clz" |
| return bits.LeadingZeros(n) |
| } |
| |
| func LeadingZeros64(n uint64) int { |
| // amd64:"BSRQ" |
| // s390x:"FLOGR" |
| // arm:"CLZ" arm64:"CLZ" |
| // mips:"CLZ" |
| // wasm:"I64Clz" |
| return bits.LeadingZeros64(n) |
| } |
| |
| func LeadingZeros32(n uint32) int { |
| // amd64:"BSRQ","LEAQ",-"CMOVQEQ" |
| // s390x:"FLOGR" |
| // arm:"CLZ" arm64:"CLZW" |
| // mips:"CLZ" |
| // wasm:"I64Clz" |
| return bits.LeadingZeros32(n) |
| } |
| |
| func LeadingZeros16(n uint16) int { |
| // amd64:"BSRL","LEAL",-"CMOVQEQ" |
| // s390x:"FLOGR" |
| // arm:"CLZ" arm64:"CLZ" |
| // mips:"CLZ" |
| // wasm:"I64Clz" |
| return bits.LeadingZeros16(n) |
| } |
| |
| func LeadingZeros8(n uint8) int { |
| // amd64:"BSRL","LEAL",-"CMOVQEQ" |
| // s390x:"FLOGR" |
| // arm:"CLZ" arm64:"CLZ" |
| // mips:"CLZ" |
| // wasm:"I64Clz" |
| return bits.LeadingZeros8(n) |
| } |
| |
| // --------------- // |
| // bits.Len* // |
| // --------------- // |
| |
| func Len(n uint) int { |
| // amd64:"BSRQ" |
| // s390x:"FLOGR" |
| // arm:"CLZ" arm64:"CLZ" |
| // mips:"CLZ" |
| // wasm:"I64Clz" |
| return bits.Len(n) |
| } |
| |
| func Len64(n uint64) int { |
| // amd64:"BSRQ" |
| // s390x:"FLOGR" |
| // arm:"CLZ" arm64:"CLZ" |
| // mips:"CLZ" |
| // wasm:"I64Clz" |
| // ppc64le:"SUBC","CNTLZD" |
| // ppc64:"SUBC","CNTLZD" |
| return bits.Len64(n) |
| } |
| |
| func SubFromLen64(n uint64) int { |
| // ppc64le:"CNTLZD",-"SUBC" |
| // ppc64:"CNTLZD",-"SUBC" |
| return 64 - bits.Len64(n) |
| } |
| |
| func Len32(n uint32) int { |
| // amd64:"BSRQ","LEAQ",-"CMOVQEQ" |
| // s390x:"FLOGR" |
| // arm:"CLZ" arm64:"CLZ" |
| // mips:"CLZ" |
| // wasm:"I64Clz" |
| return bits.Len32(n) |
| } |
| |
| func Len16(n uint16) int { |
| // amd64:"BSRL","LEAL",-"CMOVQEQ" |
| // s390x:"FLOGR" |
| // arm:"CLZ" arm64:"CLZ" |
| // mips:"CLZ" |
| // wasm:"I64Clz" |
| return bits.Len16(n) |
| } |
| |
| func Len8(n uint8) int { |
| // amd64:"BSRL","LEAL",-"CMOVQEQ" |
| // s390x:"FLOGR" |
| // arm:"CLZ" arm64:"CLZ" |
| // mips:"CLZ" |
| // wasm:"I64Clz" |
| return bits.Len8(n) |
| } |
| |
| // -------------------- // |
| // bits.OnesCount // |
| // -------------------- // |
| |
| // amd64:".*x86HasPOPCNT" |
| func OnesCount(n uint) int { |
| // amd64:"POPCNTQ" |
| // arm64:"VCNT","VUADDLV" |
| // s390x:"POPCNT" |
| // ppc64:"POPCNTD" |
| // ppc64le:"POPCNTD" |
| // wasm:"I64Popcnt" |
| return bits.OnesCount(n) |
| } |
| |
| // amd64:".*x86HasPOPCNT" |
| func OnesCount64(n uint64) int { |
| // amd64:"POPCNTQ" |
| // arm64:"VCNT","VUADDLV" |
| // s390x:"POPCNT" |
| // ppc64:"POPCNTD" |
| // ppc64le:"POPCNTD" |
| // wasm:"I64Popcnt" |
| return bits.OnesCount64(n) |
| } |
| |
| // amd64:".*x86HasPOPCNT" |
| func OnesCount32(n uint32) int { |
| // amd64:"POPCNTL" |
| // arm64:"VCNT","VUADDLV" |
| // s390x:"POPCNT" |
| // ppc64:"POPCNTW" |
| // ppc64le:"POPCNTW" |
| // wasm:"I64Popcnt" |
| return bits.OnesCount32(n) |
| } |
| |
| // amd64:".*x86HasPOPCNT" |
| func OnesCount16(n uint16) int { |
| // amd64:"POPCNTL" |
| // arm64:"VCNT","VUADDLV" |
| // s390x:"POPCNT" |
| // ppc64:"POPCNTW" |
| // ppc64le:"POPCNTW" |
| // wasm:"I64Popcnt" |
| return bits.OnesCount16(n) |
| } |
| |
| func OnesCount8(n uint8) int { |
| // s390x:"POPCNT" |
| // ppc64:"POPCNTB" |
| // ppc64le:"POPCNTB" |
| // wasm:"I64Popcnt" |
| return bits.OnesCount8(n) |
| } |
| |
| // ----------------------- // |
| // bits.ReverseBytes // |
| // ----------------------- // |
| |
| func ReverseBytes(n uint) uint { |
| // amd64:"BSWAPQ" |
| // s390x:"MOVDBR" |
| // arm64:"REV" |
| return bits.ReverseBytes(n) |
| } |
| |
| func ReverseBytes64(n uint64) uint64 { |
| // amd64:"BSWAPQ" |
| // s390x:"MOVDBR" |
| // arm64:"REV" |
| return bits.ReverseBytes64(n) |
| } |
| |
| func ReverseBytes32(n uint32) uint32 { |
| // amd64:"BSWAPL" |
| // s390x:"MOVWBR" |
| // arm64:"REVW" |
| return bits.ReverseBytes32(n) |
| } |
| |
| func ReverseBytes16(n uint16) uint16 { |
| // amd64:"ROLW" |
| // arm64:"REV16W",-"UBFX",-"ORR" |
| // arm/5:"SLL","SRL","ORR" |
| // arm/6:"REV16" |
| // arm/7:"REV16" |
| return bits.ReverseBytes16(n) |
| } |
| |
| // --------------------- // |
| // bits.RotateLeft // |
| // --------------------- // |
| |
| func RotateLeft64(n uint64) uint64 { |
| // amd64:"ROLQ" |
| // arm64:"ROR" |
| // ppc64:"ROTL" |
| // ppc64le:"ROTL" |
| // s390x:"RISBGZ\t[$]0, [$]63, [$]37, " |
| // wasm:"I64Rotl" |
| return bits.RotateLeft64(n, 37) |
| } |
| |
| func RotateLeft32(n uint32) uint32 { |
| // amd64:"ROLL" 386:"ROLL" |
| // arm:`MOVW\tR[0-9]+@>23` |
| // arm64:"RORW" |
| // ppc64:"ROTLW" |
| // ppc64le:"ROTLW" |
| // s390x:"RLL" |
| // wasm:"I32Rotl" |
| return bits.RotateLeft32(n, 9) |
| } |
| |
| func RotateLeft16(n uint16) uint16 { |
| // amd64:"ROLW" 386:"ROLW" |
| return bits.RotateLeft16(n, 5) |
| } |
| |
| func RotateLeft8(n uint8) uint8 { |
| // amd64:"ROLB" 386:"ROLB" |
| return bits.RotateLeft8(n, 5) |
| } |
| |
| func RotateLeftVariable(n uint, m int) uint { |
| // amd64:"ROLQ" |
| // arm64:"ROR" |
| // ppc64:"ROTL" |
| // ppc64le:"ROTL" |
| // s390x:"RLLG" |
| // wasm:"I64Rotl" |
| return bits.RotateLeft(n, m) |
| } |
| |
| func RotateLeftVariable64(n uint64, m int) uint64 { |
| // amd64:"ROLQ" |
| // arm64:"ROR" |
| // ppc64:"ROTL" |
| // ppc64le:"ROTL" |
| // s390x:"RLLG" |
| // wasm:"I64Rotl" |
| return bits.RotateLeft64(n, m) |
| } |
| |
| func RotateLeftVariable32(n uint32, m int) uint32 { |
| // arm:`MOVW\tR[0-9]+@>R[0-9]+` |
| // amd64:"ROLL" |
| // arm64:"RORW" |
| // ppc64:"ROTLW" |
| // ppc64le:"ROTLW" |
| // s390x:"RLL" |
| // wasm:"I32Rotl" |
| return bits.RotateLeft32(n, m) |
| } |
| |
| // ------------------------ // |
| // bits.TrailingZeros // |
| // ------------------------ // |
| |
| func TrailingZeros(n uint) int { |
| // amd64:"BSFQ","MOVL\t\\$64","CMOVQEQ" |
| // arm:"CLZ" |
| // arm64:"RBIT","CLZ" |
| // s390x:"FLOGR" |
| // ppc64/power8:"ANDN","POPCNTD" |
| // ppc64le/power8:"ANDN","POPCNTD" |
| // ppc64/power9: "CNTTZD" |
| // ppc64le/power9: "CNTTZD" |
| // wasm:"I64Ctz" |
| return bits.TrailingZeros(n) |
| } |
| |
| func TrailingZeros64(n uint64) int { |
| // amd64:"BSFQ","MOVL\t\\$64","CMOVQEQ" |
| // arm64:"RBIT","CLZ" |
| // s390x:"FLOGR" |
| // ppc64/power8:"ANDN","POPCNTD" |
| // ppc64le/power8:"ANDN","POPCNTD" |
| // ppc64/power9: "CNTTZD" |
| // ppc64le/power9: "CNTTZD" |
| // wasm:"I64Ctz" |
| return bits.TrailingZeros64(n) |
| } |
| |
| func TrailingZeros64Subtract(n uint64) int { |
| // ppc64le/power8:"NEG","SUBC","ANDN","POPCNTD" |
| // ppc64le/power9:"SUBC","CNTTZD" |
| return bits.TrailingZeros64(1 - n) |
| } |
| |
| func TrailingZeros32(n uint32) int { |
| // amd64:"BTSQ\\t\\$32","BSFQ" |
| // arm:"CLZ" |
| // arm64:"RBITW","CLZW" |
| // s390x:"FLOGR","MOVWZ" |
| // ppc64/power8:"ANDN","POPCNTW" |
| // ppc64le/power8:"ANDN","POPCNTW" |
| // ppc64/power9: "CNTTZW" |
| // ppc64le/power9: "CNTTZW" |
| // wasm:"I64Ctz" |
| return bits.TrailingZeros32(n) |
| } |
| |
| func TrailingZeros16(n uint16) int { |
| // amd64:"BSFL","BTSL\\t\\$16" |
| // 386:"BSFL\t" |
| // arm:"ORR\t\\$65536","CLZ",-"MOVHU\tR" |
| // arm64:"ORR\t\\$65536","RBITW","CLZW",-"MOVHU\tR",-"RBIT\t",-"CLZ\t" |
| // s390x:"FLOGR","OR\t\\$65536" |
| // ppc64/power8:"POPCNTD","OR\\t\\$65536" |
| // ppc64le/power8:"POPCNTD","OR\\t\\$65536" |
| // ppc64/power9:"CNTTZD","OR\\t\\$65536" |
| // ppc64le/power9:"CNTTZD","OR\\t\\$65536" |
| // wasm:"I64Ctz" |
| return bits.TrailingZeros16(n) |
| } |
| |
| func TrailingZeros8(n uint8) int { |
| // amd64:"BSFL","BTSL\\t\\$8" |
| // arm:"ORR\t\\$256","CLZ",-"MOVBU\tR" |
| // arm64:"ORR\t\\$256","RBITW","CLZW",-"MOVBU\tR",-"RBIT\t",-"CLZ\t" |
| // s390x:"FLOGR","OR\t\\$256" |
| // wasm:"I64Ctz" |
| return bits.TrailingZeros8(n) |
| } |
| |
| // IterateBitsNN checks special handling of TrailingZerosNN when the input is known to be non-zero. |
| |
| func IterateBits(n uint) int { |
| i := 0 |
| for n != 0 { |
| // amd64:"BSFQ",-"CMOVEQ" |
| i += bits.TrailingZeros(n) |
| n &= n - 1 |
| } |
| return i |
| } |
| |
| func IterateBits64(n uint64) int { |
| i := 0 |
| for n != 0 { |
| // amd64:"BSFQ",-"CMOVEQ" |
| i += bits.TrailingZeros64(n) |
| n &= n - 1 |
| } |
| return i |
| } |
| |
| func IterateBits32(n uint32) int { |
| i := 0 |
| for n != 0 { |
| // amd64:"BSFL",-"BTSQ" |
| i += bits.TrailingZeros32(n) |
| n &= n - 1 |
| } |
| return i |
| } |
| |
| func IterateBits16(n uint16) int { |
| i := 0 |
| for n != 0 { |
| // amd64:"BSFL",-"BTSL" |
| // arm64:"RBITW","CLZW",-"ORR" |
| i += bits.TrailingZeros16(n) |
| n &= n - 1 |
| } |
| return i |
| } |
| |
| func IterateBits8(n uint8) int { |
| i := 0 |
| for n != 0 { |
| // amd64:"BSFL",-"BTSL" |
| // arm64:"RBITW","CLZW",-"ORR" |
| i += bits.TrailingZeros8(n) |
| n &= n - 1 |
| } |
| return i |
| } |
| |
| // --------------- // |
| // bits.Add* // |
| // --------------- // |
| |
| func Add(x, y, ci uint) (r, co uint) { |
| // arm64:"ADDS","ADCS","ADC",-"ADD\t",-"CMP" |
| // amd64:"NEGL","ADCQ","SBBQ","NEGQ" |
| // s390x:"ADDE","ADDC\t[$]-1," |
| return bits.Add(x, y, ci) |
| } |
| |
| func AddC(x, ci uint) (r, co uint) { |
| // arm64:"ADDS","ADCS","ADC",-"ADD\t",-"CMP" |
| // amd64:"NEGL","ADCQ","SBBQ","NEGQ" |
| // s390x:"ADDE","ADDC\t[$]-1," |
| return bits.Add(x, 7, ci) |
| } |
| |
| func AddZ(x, y uint) (r, co uint) { |
| // arm64:"ADDS","ADC",-"ADCS",-"ADD\t",-"CMP" |
| // amd64:"ADDQ","SBBQ","NEGQ",-"NEGL",-"ADCQ" |
| // s390x:"ADDC",-"ADDC\t[$]-1," |
| return bits.Add(x, y, 0) |
| } |
| |
| func AddR(x, y, ci uint) uint { |
| // arm64:"ADDS","ADCS",-"ADD\t",-"CMP" |
| // amd64:"NEGL","ADCQ",-"SBBQ",-"NEGQ" |
| // s390x:"ADDE","ADDC\t[$]-1," |
| r, _ := bits.Add(x, y, ci) |
| return r |
| } |
| |
| func AddM(p, q, r *[3]uint) { |
| var c uint |
| r[0], c = bits.Add(p[0], q[0], c) |
| // arm64:"ADCS",-"ADD\t",-"CMP" |
| // amd64:"ADCQ",-"NEGL",-"SBBQ",-"NEGQ" |
| // s390x:"ADDE",-"ADDC\t[$]-1," |
| r[1], c = bits.Add(p[1], q[1], c) |
| r[2], c = bits.Add(p[2], q[2], c) |
| } |
| |
| func Add64(x, y, ci uint64) (r, co uint64) { |
| // arm64:"ADDS","ADCS","ADC",-"ADD\t",-"CMP" |
| // amd64:"NEGL","ADCQ","SBBQ","NEGQ" |
| // ppc64: "ADDC", "ADDE", "ADDZE" |
| // ppc64le: "ADDC", "ADDE", "ADDZE" |
| // s390x:"ADDE","ADDC\t[$]-1," |
| return bits.Add64(x, y, ci) |
| } |
| |
| func Add64C(x, ci uint64) (r, co uint64) { |
| // arm64:"ADDS","ADCS","ADC",-"ADD\t",-"CMP" |
| // amd64:"NEGL","ADCQ","SBBQ","NEGQ" |
| // ppc64: "ADDC", "ADDE", "ADDZE" |
| // ppc64le: "ADDC", "ADDE", "ADDZE" |
| // s390x:"ADDE","ADDC\t[$]-1," |
| return bits.Add64(x, 7, ci) |
| } |
| |
| func Add64Z(x, y uint64) (r, co uint64) { |
| // arm64:"ADDS","ADC",-"ADCS",-"ADD\t",-"CMP" |
| // amd64:"ADDQ","SBBQ","NEGQ",-"NEGL",-"ADCQ" |
| // ppc64: "ADDC", "ADDE", "ADDZE" |
| // ppc64le: "ADDC", "ADDE", "ADDZE" |
| // s390x:"ADDC",-"ADDC\t[$]-1," |
| return bits.Add64(x, y, 0) |
| } |
| |
| func Add64R(x, y, ci uint64) uint64 { |
| // arm64:"ADDS","ADCS",-"ADD\t",-"CMP" |
| // amd64:"NEGL","ADCQ",-"SBBQ",-"NEGQ" |
| // ppc64: "ADDC", "ADDE", "ADDZE" |
| // ppc64le: "ADDC", "ADDE", "ADDZE" |
| // s390x:"ADDE","ADDC\t[$]-1," |
| r, _ := bits.Add64(x, y, ci) |
| return r |
| } |
| func Add64M(p, q, r *[3]uint64) { |
| var c uint64 |
| r[0], c = bits.Add64(p[0], q[0], c) |
| // arm64:"ADCS",-"ADD\t",-"CMP" |
| // amd64:"ADCQ",-"NEGL",-"SBBQ",-"NEGQ" |
| // ppc64: "ADDC", "ADDE", "ADDZE" |
| // ppc64le: "ADDC", "ADDE", "ADDZE" |
| // s390x:"ADDE",-"ADDC\t[$]-1," |
| r[1], c = bits.Add64(p[1], q[1], c) |
| r[2], c = bits.Add64(p[2], q[2], c) |
| } |
| |
| func Add64PanicOnOverflowEQ(a, b uint64) uint64 { |
| r, c := bits.Add64(a, b, 0) |
| // s390x:"BRC\t[$]3,",-"ADDE" |
| if c == 1 { |
| panic("overflow") |
| } |
| return r |
| } |
| |
| func Add64PanicOnOverflowNE(a, b uint64) uint64 { |
| r, c := bits.Add64(a, b, 0) |
| // s390x:"BRC\t[$]3,",-"ADDE" |
| if c != 0 { |
| panic("overflow") |
| } |
| return r |
| } |
| |
| func Add64PanicOnOverflowGT(a, b uint64) uint64 { |
| r, c := bits.Add64(a, b, 0) |
| // s390x:"BRC\t[$]3,",-"ADDE" |
| if c > 0 { |
| panic("overflow") |
| } |
| return r |
| } |
| |
| func Add64MPanicOnOverflowEQ(a, b [2]uint64) [2]uint64 { |
| var r [2]uint64 |
| var c uint64 |
| r[0], c = bits.Add64(a[0], b[0], c) |
| r[1], c = bits.Add64(a[1], b[1], c) |
| // s390x:"BRC\t[$]3," |
| if c == 1 { |
| panic("overflow") |
| } |
| return r |
| } |
| |
| func Add64MPanicOnOverflowNE(a, b [2]uint64) [2]uint64 { |
| var r [2]uint64 |
| var c uint64 |
| r[0], c = bits.Add64(a[0], b[0], c) |
| r[1], c = bits.Add64(a[1], b[1], c) |
| // s390x:"BRC\t[$]3," |
| if c != 0 { |
| panic("overflow") |
| } |
| return r |
| } |
| |
| func Add64MPanicOnOverflowGT(a, b [2]uint64) [2]uint64 { |
| var r [2]uint64 |
| var c uint64 |
| r[0], c = bits.Add64(a[0], b[0], c) |
| r[1], c = bits.Add64(a[1], b[1], c) |
| // s390x:"BRC\t[$]3," |
| if c > 0 { |
| panic("overflow") |
| } |
| return r |
| } |
| |
| // --------------- // |
| // bits.Sub* // |
| // --------------- // |
| |
| func Sub(x, y, ci uint) (r, co uint) { |
| // amd64:"NEGL","SBBQ","NEGQ" |
| // arm64:"NEGS","SBCS","NGC","NEG",-"ADD",-"SUB",-"CMP" |
| // s390x:"SUBE" |
| return bits.Sub(x, y, ci) |
| } |
| |
| func SubC(x, ci uint) (r, co uint) { |
| // amd64:"NEGL","SBBQ","NEGQ" |
| // arm64:"NEGS","SBCS","NGC","NEG",-"ADD",-"SUB",-"CMP" |
| // s390x:"SUBE" |
| return bits.Sub(x, 7, ci) |
| } |
| |
| func SubZ(x, y uint) (r, co uint) { |
| // amd64:"SUBQ","SBBQ","NEGQ",-"NEGL" |
| // arm64:"SUBS","NGC","NEG",-"SBCS",-"ADD",-"SUB\t",-"CMP" |
| // s390x:"SUBC" |
| return bits.Sub(x, y, 0) |
| } |
| |
| func SubR(x, y, ci uint) uint { |
| // amd64:"NEGL","SBBQ",-"NEGQ" |
| // arm64:"NEGS","SBCS",-"NGC",-"NEG\t",-"ADD",-"SUB",-"CMP" |
| // s390x:"SUBE" |
| r, _ := bits.Sub(x, y, ci) |
| return r |
| } |
| func SubM(p, q, r *[3]uint) { |
| var c uint |
| r[0], c = bits.Sub(p[0], q[0], c) |
| // amd64:"SBBQ",-"NEGL",-"NEGQ" |
| // arm64:"SBCS",-"NEGS",-"NGC",-"NEG",-"ADD",-"SUB",-"CMP" |
| // s390x:"SUBE" |
| r[1], c = bits.Sub(p[1], q[1], c) |
| r[2], c = bits.Sub(p[2], q[2], c) |
| } |
| |
| func Sub64(x, y, ci uint64) (r, co uint64) { |
| // amd64:"NEGL","SBBQ","NEGQ" |
| // arm64:"NEGS","SBCS","NGC","NEG",-"ADD",-"SUB",-"CMP" |
| // s390x:"SUBE" |
| return bits.Sub64(x, y, ci) |
| } |
| |
| func Sub64C(x, ci uint64) (r, co uint64) { |
| // amd64:"NEGL","SBBQ","NEGQ" |
| // arm64:"NEGS","SBCS","NGC","NEG",-"ADD",-"SUB",-"CMP" |
| // s390x:"SUBE" |
| return bits.Sub64(x, 7, ci) |
| } |
| |
| func Sub64Z(x, y uint64) (r, co uint64) { |
| // amd64:"SUBQ","SBBQ","NEGQ",-"NEGL" |
| // arm64:"SUBS","NGC","NEG",-"SBCS",-"ADD",-"SUB\t",-"CMP" |
| // s390x:"SUBC" |
| return bits.Sub64(x, y, 0) |
| } |
| |
| func Sub64R(x, y, ci uint64) uint64 { |
| // amd64:"NEGL","SBBQ",-"NEGQ" |
| // arm64:"NEGS","SBCS",-"NGC",-"NEG\t",-"ADD",-"SUB",-"CMP" |
| // s390x:"SUBE" |
| r, _ := bits.Sub64(x, y, ci) |
| return r |
| } |
| func Sub64M(p, q, r *[3]uint64) { |
| var c uint64 |
| r[0], c = bits.Sub64(p[0], q[0], c) |
| // amd64:"SBBQ",-"NEGL",-"NEGQ" |
| // arm64:"SBCS",-"NEGS",-"NGC",-"NEG",-"ADD",-"SUB",-"CMP" |
| // s390x:"SUBE" |
| r[1], c = bits.Sub64(p[1], q[1], c) |
| r[2], c = bits.Sub64(p[2], q[2], c) |
| } |
| |
| func Sub64PanicOnOverflowEQ(a, b uint64) uint64 { |
| r, b := bits.Sub64(a, b, 0) |
| // s390x:"BRC\t[$]12,",-"ADDE",-"SUBE" |
| if b == 1 { |
| panic("overflow") |
| } |
| return r |
| } |
| |
| func Sub64PanicOnOverflowNE(a, b uint64) uint64 { |
| r, b := bits.Sub64(a, b, 0) |
| // s390x:"BRC\t[$]12,",-"ADDE",-"SUBE" |
| if b != 0 { |
| panic("overflow") |
| } |
| return r |
| } |
| |
| func Sub64PanicOnOverflowGT(a, b uint64) uint64 { |
| r, b := bits.Sub64(a, b, 0) |
| // s390x:"BRC\t[$]12,",-"ADDE",-"SUBE" |
| if b > 0 { |
| panic("overflow") |
| } |
| return r |
| } |
| |
| func Sub64MPanicOnOverflowEQ(a, b [2]uint64) [2]uint64 { |
| var r [2]uint64 |
| var c uint64 |
| r[0], c = bits.Sub64(a[0], b[0], c) |
| r[1], c = bits.Sub64(a[1], b[1], c) |
| // s390x:"BRC\t[$]12," |
| if c == 1 { |
| panic("overflow") |
| } |
| return r |
| } |
| |
| func Sub64MPanicOnOverflowNE(a, b [2]uint64) [2]uint64 { |
| var r [2]uint64 |
| var c uint64 |
| r[0], c = bits.Sub64(a[0], b[0], c) |
| r[1], c = bits.Sub64(a[1], b[1], c) |
| // s390x:"BRC\t[$]12," |
| if c != 0 { |
| panic("overflow") |
| } |
| return r |
| } |
| |
| func Sub64MPanicOnOverflowGT(a, b [2]uint64) [2]uint64 { |
| var r [2]uint64 |
| var c uint64 |
| r[0], c = bits.Sub64(a[0], b[0], c) |
| r[1], c = bits.Sub64(a[1], b[1], c) |
| // s390x:"BRC\t[$]12," |
| if c > 0 { |
| panic("overflow") |
| } |
| return r |
| } |
| |
| // --------------- // |
| // bits.Mul* // |
| // --------------- // |
| |
| func Mul(x, y uint) (hi, lo uint) { |
| // amd64:"MULQ" |
| // arm64:"UMULH","MUL" |
| // ppc64:"MULHDU","MULLD" |
| // ppc64le:"MULHDU","MULLD" |
| // s390x:"MLGR" |
| // mips64: "MULVU" |
| return bits.Mul(x, y) |
| } |
| |
| func Mul64(x, y uint64) (hi, lo uint64) { |
| // amd64:"MULQ" |
| // arm64:"UMULH","MUL" |
| // ppc64:"MULHDU","MULLD" |
| // ppc64le:"MULHDU","MULLD" |
| // s390x:"MLGR" |
| // mips64: "MULVU" |
| return bits.Mul64(x, y) |
| } |
| |
| // --------------- // |
| // bits.Div* // |
| // --------------- // |
| |
| func Div(hi, lo, x uint) (q, r uint) { |
| // amd64:"DIVQ" |
| return bits.Div(hi, lo, x) |
| } |
| |
| func Div32(hi, lo, x uint32) (q, r uint32) { |
| // arm64:"ORR","UDIV","MSUB",-"UREM" |
| return bits.Div32(hi, lo, x) |
| } |
| |
| func Div64(hi, lo, x uint64) (q, r uint64) { |
| // amd64:"DIVQ" |
| return bits.Div64(hi, lo, x) |
| } |
| |
| func Div64degenerate(x uint64) (q, r uint64) { |
| // amd64:-"DIVQ" |
| return bits.Div64(0, x, 5) |
| } |
