зеркало из https://github.com/CryptoPro/go.git
cmd/compile: use ANDL for small immediates
We can rewrite ANDQ with an immediate fitting in 32bit with an ANDL, which is shorter to encode. Looking at Go binary itself, before the change there was: ANDL: 2337 ANDQ: 4476 After the change: ANDL: 3790 ANDQ: 3024 So we got rid of 1452 ANDQs This makes the Linux x86_64 binary 0.03% smaller. There seems to be an impact on performance. Intel Cascade Lake benchmarks (with perflock): name old time/op new time/op delta BinaryTree17-8 1.91s ± 1% 1.89s ± 1% -1.22% (p=0.000 n=21+18) Fannkuch11-8 2.34s ± 0% 2.34s ± 0% ~ (p=0.052 n=20+20) FmtFprintfEmpty-8 27.7ns ± 1% 27.4ns ± 3% ~ (p=0.497 n=21+21) FmtFprintfString-8 53.2ns ± 0% 51.5ns ± 0% -3.21% (p=0.000 n=20+19) FmtFprintfInt-8 57.3ns ± 0% 55.7ns ± 0% -2.89% (p=0.000 n=19+19) FmtFprintfIntInt-8 92.3ns ± 0% 88.4ns ± 1% -4.23% (p=0.000 n=20+21) FmtFprintfPrefixedInt-8 103ns ± 0% 103ns ± 0% +0.23% (p=0.000 n=20+21) FmtFprintfFloat-8 147ns ± 0% 148ns ± 0% +0.75% (p=0.000 n=20+21) FmtManyArgs-8 384ns ± 0% 381ns ± 0% -0.63% (p=0.000 n=21+21) GobDecode-8 3.86ms ± 1% 3.88ms ± 1% +0.52% (p=0.000 n=20+21) GobEncode-8 2.77ms ± 1% 2.77ms ± 0% ~ (p=0.078 n=21+21) Gzip-8 168ms ± 1% 168ms ± 0% +0.24% (p=0.000 n=20+20) Gunzip-8 25.1ms ± 0% 24.3ms ± 0% -3.03% (p=0.000 n=21+21) HTTPClientServer-8 61.4µs ± 8% 59.1µs ±10% ~ (p=0.088 n=20+21) JSONEncode-8 6.86ms ± 0% 6.70ms ± 0% -2.29% (p=0.000 n=20+19) JSONDecode-8 30.8ms ± 1% 30.6ms ± 1% -0.82% (p=0.000 n=20+20) Mandelbrot200-8 3.85ms ± 0% 3.85ms ± 0% ~ (p=0.191 n=16+17) GoParse-8 2.61ms ± 2% 2.60ms ± 1% ~ (p=0.561 n=21+20) RegexpMatchEasy0_32-8 48.5ns ± 2% 45.9ns ± 3% -5.26% (p=0.000 n=20+21) RegexpMatchEasy0_1K-8 139ns ± 0% 139ns ± 0% +0.27% (p=0.000 n=18+20) RegexpMatchEasy1_32-8 41.3ns ± 0% 42.1ns ± 4% +1.95% (p=0.000 n=17+21) RegexpMatchEasy1_1K-8 216ns ± 2% 216ns ± 0% +0.17% (p=0.020 n=21+19) RegexpMatchMedium_32-8 790ns ± 7% 803ns ± 8% ~ (p=0.178 n=21+21) RegexpMatchMedium_1K-8 23.5µs ± 5% 23.7µs ± 5% ~ (p=0.421 n=21+21) RegexpMatchHard_32-8 1.09µs ± 1% 1.09µs ± 1% -0.53% (p=0.000 n=19+18) RegexpMatchHard_1K-8 33.0µs ± 0% 33.0µs ± 0% ~ (p=0.610 n=21+20) Revcomp-8 348ms ± 0% 353ms ± 0% +1.38% (p=0.000 n=17+18) Template-8 42.0ms ± 1% 41.9ms ± 1% -0.30% (p=0.049 n=20+20) TimeParse-8 185ns ± 0% 185ns ± 0% ~ (p=0.387 n=20+18) TimeFormat-8 237ns ± 1% 241ns ± 1% +1.57% (p=0.000 n=21+21) [Geo mean] 35.4µs 35.2µs -0.66% name old speed new speed delta GobDecode-8 199MB/s ± 1% 198MB/s ± 1% -0.52% (p=0.000 n=20+21) GobEncode-8 277MB/s ± 1% 277MB/s ± 0% ~ (p=0.075 n=21+21) Gzip-8 116MB/s ± 1% 115MB/s ± 0% -0.25% (p=0.000 n=20+20) Gunzip-8 773MB/s ± 0% 797MB/s ± 0% +3.12% (p=0.000 n=21+21) JSONEncode-8 283MB/s ± 0% 290MB/s ± 0% +2.35% (p=0.000 n=20+19) JSONDecode-8 63.0MB/s ± 1% 63.5MB/s ± 1% +0.82% (p=0.000 n=20+20) GoParse-8 22.2MB/s ± 2% 22.3MB/s ± 1% ~ (p=0.539 n=21+20) RegexpMatchEasy0_32-8 660MB/s ± 2% 697MB/s ± 3% +5.57% (p=0.000 n=20+21) RegexpMatchEasy0_1K-8 7.36GB/s ± 0% 7.34GB/s ± 0% -0.26% (p=0.000 n=18+20) RegexpMatchEasy1_32-8 775MB/s ± 0% 761MB/s ± 4% -1.88% (p=0.000 n=17+21) RegexpMatchEasy1_1K-8 4.74GB/s ± 2% 4.74GB/s ± 0% -0.18% (p=0.020 n=21+19) RegexpMatchMedium_32-8 40.6MB/s ± 7% 39.9MB/s ± 9% ~ (p=0.191 n=21+21) RegexpMatchMedium_1K-8 43.7MB/s ± 5% 43.2MB/s ± 5% ~ (p=0.435 n=21+21) RegexpMatchHard_32-8 29.3MB/s ± 1% 29.4MB/s ± 1% +0.53% (p=0.000 n=19+18) RegexpMatchHard_1K-8 31.0MB/s ± 0% 31.0MB/s ± 0% ~ (p=0.572 n=21+20) Revcomp-8 730MB/s ± 0% 720MB/s ± 0% -1.36% (p=0.000 n=17+18) Template-8 46.2MB/s ± 1% 46.3MB/s ± 1% +0.30% (p=0.041 n=20+20) [Geo mean] 204MB/s 205MB/s +0.30% Change-Id: Iac75d0ec184a515ce0e65e19559d5fe2e9840514 Reviewed-on: https://go-review.googlesource.com/c/go/+/354970 Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com> Trust: Josh Bleecher Snyder <josharian@gmail.com> Trust: Keith Randall <khr@golang.org> Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com> TryBot-Result: Go Bot <gobot@golang.org>
This commit is contained in:
Jake Ciolek
Josh Bleecher Snyder
Родитель
3283d1a2f2
Коммит
732f6fa9d5
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@ -618,8 +618,21 @@ func ssaGenValue(s *ssagen.State, v *ssa.Value) {
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p.To.Reg = r
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p.SetFrom3Reg(v.Args[0].Reg())
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case ssa.OpAMD64ANDQconst:
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asm := v.Op.Asm()
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// If the constant is positive and fits into 32 bits, use ANDL.
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// This saves a few bytes of encoding.
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if 0 <= v.AuxInt && v.AuxInt <= (1<<32-1) {
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asm = x86.AANDL
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}
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p := s.Prog(asm)
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p.From.Type = obj.TYPE_CONST
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p.From.Offset = v.AuxInt
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p.To.Type = obj.TYPE_REG
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p.To.Reg = v.Reg()
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case ssa.OpAMD64SUBQconst, ssa.OpAMD64SUBLconst,
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ssa.OpAMD64ANDQconst, ssa.OpAMD64ANDLconst,
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ssa.OpAMD64ANDLconst,
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ssa.OpAMD64ORQconst, ssa.OpAMD64ORLconst,
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ssa.OpAMD64XORQconst, ssa.OpAMD64XORLconst,
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ssa.OpAMD64SHLQconst, ssa.OpAMD64SHLLconst,
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@ -241,7 +241,7 @@ func FloatDivs(a []float32) float32 {
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func Pow2Mods(n1 uint, n2 int) (uint, int) {
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// 386:"ANDL\t[$]31",-"DIVL"
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// amd64:"ANDQ\t[$]31",-"DIVQ"
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// amd64:"ANDL\t[$]31",-"DIVQ"
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// arm:"AND\t[$]31",-".*udiv"
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// arm64:"AND\t[$]31",-"UDIV"
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// ppc64:"ANDCC\t[$]31"
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@ -452,7 +452,7 @@ func LenDiv2(s string) int {
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func LenMod1(a []int) int {
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// 386:"ANDL\t[$]1023"
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// amd64:"ANDQ\t[$]1023"
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// amd64:"ANDL\t[$]1023"
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// arm64:"AND\t[$]1023",-"SDIV"
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// arm/6:"AND",-".*udiv"
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// arm/7:"BFC",-".*udiv",-"AND"
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@ -463,7 +463,7 @@ func LenMod1(a []int) int {
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func LenMod2(s string) int {
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// 386:"ANDL\t[$]2047"
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// amd64:"ANDQ\t[$]2047"
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// amd64:"ANDL\t[$]2047"
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// arm64:"AND\t[$]2047",-"SDIV"
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// arm/6:"AND",-".*udiv"
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// arm/7:"BFC",-".*udiv",-"AND"
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@ -484,7 +484,7 @@ func CapDiv(a []int) int {
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func CapMod(a []int) int {
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// 386:"ANDL\t[$]4095"
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// amd64:"ANDQ\t[$]4095"
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// amd64:"ANDL\t[$]4095"
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// arm64:"AND\t[$]4095",-"SDIV"
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// arm/6:"AND",-".*udiv"
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// arm/7:"BFC",-".*udiv",-"AND"
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@ -332,7 +332,7 @@ func bitSetPowerOf2Test(x int) bool {
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}
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func bitSetTest(x int) bool {
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// amd64:"ANDQ\t[$]9, AX"
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// amd64:"ANDL\t[$]9, AX"
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// amd64:"CMPQ\tAX, [$]9"
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return x&9 == 9
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}
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@ -27,7 +27,7 @@ func convertNeq0L(x uint32, c bool) bool {
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}
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func convertNeq0Q(x uint64, c bool) bool {
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// amd64:"ANDQ\t[$]1",-"SETB"
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// amd64:"ANDL\t[$]1",-"SETB"
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b := x&1 != 0
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return c && b
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}
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