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901510ed4e
go/test/codegen/mathbits.go
David Chase 4df3d0e4df cmd/compile: rescue stmt boundaries from OpArgXXXReg and OpSelectN. 
Fixes this failure:
go test cmd/compile/internal/ssa -run TestStmtLines -v
=== RUN   TestStmtLines
    stmtlines_test.go:115: Saw too many (amd64, > 1%) lines without
    statement marks, total=88263, nostmt=1930
    ('-run TestStmtLines -v' lists failing lines)

The failure has two causes.

One is that the first-line adjuster in code generation was relocating
"first lines" to instructions that would either not have any code generated,
or would have the statment marker removed by a different believed-good heuristic.

The other was that statement boundaries were getting attached to register
values (that with the old ABI were loads from the stack, hence real instructions).
The register values disappear at code generation.

The fixes are to (1) note that certain instructions are not good choices for
"first value" and skip them, and (2) in an expandCalls post-pass, look for
register valued instructions and under appropriate conditions move their
statement marker to a compatible use.

Also updates TestStmtLines to always log the score, for easier comparison of
minor compiler changes.

Updates #40724.

Change-Id: I485573ce900e292d7c44574adb7629cdb4695c3f
Reviewed-on: https://go-review.googlesource.com/c/go/+/309649
Trust: David Chase <drchase@google.com>
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
2021-04-14 18:46:08 +00:00

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// 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 //
// -------------------- //
// TODO(register args) Restore a m d 6 4 :.*x86HasPOPCNT when only one ABI is tested.
func OnesCount(n uint) int {
// amd64:"POPCNTQ"
// arm64:"VCNT","VUADDLV"
// s390x:"POPCNT"
// ppc64:"POPCNTD"
// ppc64le:"POPCNTD"
// wasm:"I64Popcnt"
return bits.OnesCount(n)
}
func OnesCount64(n uint64) int {
// amd64:"POPCNTQ"
// arm64:"VCNT","VUADDLV"
// s390x:"POPCNT"
// ppc64:"POPCNTD"
// ppc64le:"POPCNTD"
// wasm:"I64Popcnt"
return bits.OnesCount64(n)
}
func OnesCount32(n uint32) int {
// amd64:"POPCNTL"
// arm64:"VCNT","VUADDLV"
// s390x:"POPCNT"
// ppc64:"POPCNTW"
// ppc64le:"POPCNTW"
// wasm:"I64Popcnt"
return bits.OnesCount32(n)
}
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)
}
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