mirror of
https://github.com/golang/go
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cmd/compile: generic SSA rules for simplifying 2 and 3 operand integer arithmetic expressions
This applies the following generic integer addition/subtraction transformations: x - (x + y) = -y (x - y) - x = -y y + (x - y) = x y + (z + (x - y) = x + z There's over 40 unique functions matching in Go. Hits 2 funcs in the runtime itself: runtime.stackfree() runtime.runqdrain() Go binary size reduced by 0.05% on Linux x86_64. StackCopy bench (perflocked Cascade Lake x86): name old time/op new time/op delta StackCopyPtr-8 87.3ms ± 1% 86.9ms ± 0% -0.45% (p=0.000 n=20+20) StackCopy-8 77.6ms ± 1% 77.0ms ± 0% -0.76% (p=0.000 n=20+20) StackCopyNoCache-8 2.28ms ± 2% 2.26ms ± 2% -0.93% (p=0.008 n=19+20) test/bench/go1 benchmarks (perflocked Cascade Lake x86): name old time/op new time/op delta BinaryTree17-8 1.88s ± 1% 1.88s ± 0% ~ (p=0.373 n=15+12) Fannkuch11-8 2.31s ± 0% 2.35s ± 0% +1.52% (p=0.000 n=15+14) FmtFprintfEmpty-8 26.6ns ± 0% 26.6ns ± 0% ~ (p=0.081 n=14+13) FmtFprintfString-8 48.6ns ± 0% 50.0ns ± 0% +2.86% (p=0.000 n=15+14) FmtFprintfInt-8 56.9ns ± 0% 54.8ns ± 0% -3.70% (p=0.000 n=15+15) FmtFprintfIntInt-8 90.4ns ± 0% 88.8ns ± 0% -1.78% (p=0.000 n=15+15) FmtFprintfPrefixedInt-8 104ns ± 0% 104ns ± 0% ~ (p=0.905 n=14+13) FmtFprintfFloat-8 148ns ± 0% 144ns ± 0% -2.19% (p=0.000 n=14+15) FmtManyArgs-8 389ns ± 0% 390ns ± 0% +0.35% (p=0.000 n=12+15) GobDecode-8 3.90ms ± 1% 3.88ms ± 0% -0.49% (p=0.000 n=15+14) GobEncode-8 2.73ms ± 0% 2.73ms ± 0% ~ (p=0.425 n=15+14) Gzip-8 169ms ± 0% 168ms ± 0% -0.52% (p=0.000 n=13+13) Gunzip-8 24.7ms ± 0% 24.8ms ± 0% +0.61% (p=0.000 n=15+15) HTTPClientServer-8 60.5µs ± 6% 60.4µs ± 7% ~ (p=0.595 n=15+15) JSONEncode-8 6.97ms ± 1% 6.93ms ± 0% -0.69% (p=0.000 n=14+14) JSONDecode-8 31.2ms ± 1% 30.8ms ± 1% -1.27% (p=0.000 n=14+14) Mandelbrot200-8 3.87ms ± 0% 3.87ms ± 0% ~ (p=0.652 n=15+14) GoParse-8 2.65ms ± 2% 2.64ms ± 1% ~ (p=0.202 n=15+15) RegexpMatchEasy0_32-8 45.1ns ± 0% 45.9ns ± 0% +1.68% (p=0.000 n=14+15) RegexpMatchEasy0_1K-8 140ns ± 0% 139ns ± 0% -0.44% (p=0.000 n=15+14) RegexpMatchEasy1_32-8 40.9ns ± 3% 40.5ns ± 0% -0.88% (p=0.000 n=15+13) RegexpMatchEasy1_1K-8 215ns ± 1% 220ns ± 1% +2.27% (p=0.000 n=15+15) RegexpMatchMedium_32-8 783ns ± 7% 738ns ± 0% ~ (p=0.361 n=15+15) RegexpMatchMedium_1K-8 24.1µs ± 6% 23.4µs ± 6% -2.94% (p=0.004 n=15+15) RegexpMatchHard_32-8 1.10µs ± 1% 1.09µs ± 1% -0.40% (p=0.006 n=15+14) RegexpMatchHard_1K-8 33.0µs ± 0% 33.0µs ± 0% ~ (p=0.535 n=12+14) Revcomp-8 354ms ± 0% 353ms ± 0% -0.23% (p=0.002 n=15+13) Template-8 42.0ms ± 1% 41.8ms ± 2% -0.37% (p=0.023 n=14+15) TimeParse-8 181ns ± 0% 180ns ± 1% -0.18% (p=0.014 n=12+13) TimeFormat-8 240ns ± 0% 242ns ± 1% +0.69% (p=0.000 n=12+15) [Geo mean] 35.2µs 35.1µs -0.43% name old speed new speed delta GobDecode-8 197MB/s ± 1% 198MB/s ± 0% +0.49% (p=0.000 n=15+14) GobEncode-8 281MB/s ± 0% 281MB/s ± 0% ~ (p=0.419 n=15+14) Gzip-8 115MB/s ± 0% 115MB/s ± 0% +0.52% (p=0.000 n=13+13) Gunzip-8 786MB/s ± 0% 781MB/s ± 0% -0.60% (p=0.000 n=15+15) JSONEncode-8 278MB/s ± 1% 280MB/s ± 0% +0.69% (p=0.000 n=14+14) JSONDecode-8 62.3MB/s ± 1% 63.1MB/s ± 1% +1.29% (p=0.000 n=14+14) GoParse-8 21.9MB/s ± 2% 22.0MB/s ± 1% ~ (p=0.205 n=15+15) RegexpMatchEasy0_32-8 709MB/s ± 0% 697MB/s ± 0% -1.65% (p=0.000 n=14+15) RegexpMatchEasy0_1K-8 7.34GB/s ± 0% 7.37GB/s ± 0% +0.43% (p=0.000 n=15+15) RegexpMatchEasy1_32-8 783MB/s ± 2% 790MB/s ± 0% +0.88% (p=0.000 n=15+13) RegexpMatchEasy1_1K-8 4.77GB/s ± 1% 4.66GB/s ± 1% -2.23% (p=0.000 n=15+15) RegexpMatchMedium_32-8 41.0MB/s ± 7% 43.3MB/s ± 0% ~ (p=0.360 n=15+15) RegexpMatchMedium_1K-8 42.5MB/s ± 6% 43.8MB/s ± 6% +3.07% (p=0.004 n=15+15) RegexpMatchHard_32-8 29.2MB/s ± 1% 29.3MB/s ± 1% +0.41% (p=0.006 n=15+14) RegexpMatchHard_1K-8 31.1MB/s ± 0% 31.1MB/s ± 0% ~ (p=0.495 n=12+14) Revcomp-8 718MB/s ± 0% 720MB/s ± 0% +0.23% (p=0.002 n=15+13) Template-8 46.3MB/s ± 1% 46.4MB/s ± 2% +0.38% (p=0.021 n=14+15) [Geo mean] 205MB/s 206MB/s +0.57% Change-Id: Ibd1afdf8b6c0b08087dcc3acd8f943637eb95ac0 Reviewed-on: https://go-review.googlesource.com/c/go/+/344930 Reviewed-by: Keith Randall <khr@golang.org> Run-TryBot: Keith Randall <khr@golang.org> TryBot-Result: Go Bot <gobot@golang.org> Trust: Josh Bleecher Snyder <josharian@gmail.com>
This commit is contained in:
Jake Ciolek
Keith Randall
parent
5baf60d472
commit
6cf1d5d0fa
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@ -590,6 +590,10 @@
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// simplifications often used for lengths. e.g. len(s[i:i+5])==5
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(Sub(64|32|16|8) (Add(64|32|16|8) x y) x) => y
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(Sub(64|32|16|8) (Add(64|32|16|8) x y) y) => x
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(Sub(64|32|16|8) (Sub(64|32|16|8) x y) x) => (Neg(64|32|16|8) y)
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(Sub(64|32|16|8) x (Add(64|32|16|8) x y)) => (Neg(64|32|16|8) y)
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(Add(64|32|16|8) x (Sub(64|32|16|8) y x)) => y
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(Add(64|32|16|8) x (Add(64|32|16|8) y (Sub(64|32|16|8) z x))) => (Add(64|32|16|8) y z)
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// basic phi simplifications
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(Phi (Const8 [c]) (Const8 [c])) => (Const8 [c])
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@ -533,6 +533,52 @@ func rewriteValuegeneric_OpAdd16(v *Value) bool {
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}
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break
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}
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// match: (Add16 x (Sub16 y x))
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// result: y
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for {
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for _i0 := 0; _i0 <= 1; _i0, v_0, v_1 = _i0+1, v_1, v_0 {
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x := v_0
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if v_1.Op != OpSub16 {
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continue
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}
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_ = v_1.Args[1]
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y := v_1.Args[0]
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if x != v_1.Args[1] {
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continue
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}
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v.copyOf(y)
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return true
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}
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break
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}
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// match: (Add16 x (Add16 y (Sub16 z x)))
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// result: (Add16 y z)
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for {
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for _i0 := 0; _i0 <= 1; _i0, v_0, v_1 = _i0+1, v_1, v_0 {
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x := v_0
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if v_1.Op != OpAdd16 {
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continue
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}
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_ = v_1.Args[1]
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v_1_0 := v_1.Args[0]
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v_1_1 := v_1.Args[1]
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for _i1 := 0; _i1 <= 1; _i1, v_1_0, v_1_1 = _i1+1, v_1_1, v_1_0 {
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y := v_1_0
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if v_1_1.Op != OpSub16 {
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continue
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}
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_ = v_1_1.Args[1]
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z := v_1_1.Args[0]
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if x != v_1_1.Args[1] {
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continue
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}
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v.reset(OpAdd16)
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v.AddArg2(y, z)
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return true
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}
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}
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break
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}
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// match: (Add16 (Add16 i:(Const16 <t>) z) x)
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// cond: (z.Op != OpConst16 && x.Op != OpConst16)
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// result: (Add16 i (Add16 <t> z x))
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@ -732,6 +778,52 @@ func rewriteValuegeneric_OpAdd32(v *Value) bool {
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}
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break
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}
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// match: (Add32 x (Sub32 y x))
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// result: y
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for {
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for _i0 := 0; _i0 <= 1; _i0, v_0, v_1 = _i0+1, v_1, v_0 {
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x := v_0
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if v_1.Op != OpSub32 {
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continue
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}
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_ = v_1.Args[1]
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y := v_1.Args[0]
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if x != v_1.Args[1] {
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continue
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}
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v.copyOf(y)
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return true
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}
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break
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}
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// match: (Add32 x (Add32 y (Sub32 z x)))
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// result: (Add32 y z)
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for {
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for _i0 := 0; _i0 <= 1; _i0, v_0, v_1 = _i0+1, v_1, v_0 {
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x := v_0
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if v_1.Op != OpAdd32 {
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continue
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}
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_ = v_1.Args[1]
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v_1_0 := v_1.Args[0]
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v_1_1 := v_1.Args[1]
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for _i1 := 0; _i1 <= 1; _i1, v_1_0, v_1_1 = _i1+1, v_1_1, v_1_0 {
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y := v_1_0
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if v_1_1.Op != OpSub32 {
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continue
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}
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_ = v_1_1.Args[1]
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z := v_1_1.Args[0]
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if x != v_1_1.Args[1] {
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continue
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}
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v.reset(OpAdd32)
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v.AddArg2(y, z)
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return true
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}
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}
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break
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}
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// match: (Add32 (Add32 i:(Const32 <t>) z) x)
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// cond: (z.Op != OpConst32 && x.Op != OpConst32)
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// result: (Add32 i (Add32 <t> z x))
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@ -958,6 +1050,52 @@ func rewriteValuegeneric_OpAdd64(v *Value) bool {
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}
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break
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}
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// match: (Add64 x (Sub64 y x))
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// result: y
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for {
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for _i0 := 0; _i0 <= 1; _i0, v_0, v_1 = _i0+1, v_1, v_0 {
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x := v_0
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if v_1.Op != OpSub64 {
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continue
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}
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_ = v_1.Args[1]
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y := v_1.Args[0]
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if x != v_1.Args[1] {
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continue
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}
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v.copyOf(y)
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return true
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}
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break
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}
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// match: (Add64 x (Add64 y (Sub64 z x)))
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// result: (Add64 y z)
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for {
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for _i0 := 0; _i0 <= 1; _i0, v_0, v_1 = _i0+1, v_1, v_0 {
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x := v_0
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if v_1.Op != OpAdd64 {
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continue
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}
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_ = v_1.Args[1]
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v_1_0 := v_1.Args[0]
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v_1_1 := v_1.Args[1]
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for _i1 := 0; _i1 <= 1; _i1, v_1_0, v_1_1 = _i1+1, v_1_1, v_1_0 {
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y := v_1_0
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if v_1_1.Op != OpSub64 {
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continue
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}
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_ = v_1_1.Args[1]
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z := v_1_1.Args[0]
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if x != v_1_1.Args[1] {
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continue
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}
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v.reset(OpAdd64)
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v.AddArg2(y, z)
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return true
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}
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}
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break
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}
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// match: (Add64 (Add64 i:(Const64 <t>) z) x)
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// cond: (z.Op != OpConst64 && x.Op != OpConst64)
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// result: (Add64 i (Add64 <t> z x))
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@ -1184,6 +1322,52 @@ func rewriteValuegeneric_OpAdd8(v *Value) bool {
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}
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break
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}
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// match: (Add8 x (Sub8 y x))
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// result: y
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for {
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for _i0 := 0; _i0 <= 1; _i0, v_0, v_1 = _i0+1, v_1, v_0 {
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x := v_0
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if v_1.Op != OpSub8 {
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continue
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}
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_ = v_1.Args[1]
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y := v_1.Args[0]
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if x != v_1.Args[1] {
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continue
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}
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v.copyOf(y)
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return true
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}
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break
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}
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// match: (Add8 x (Add8 y (Sub8 z x)))
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// result: (Add8 y z)
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for {
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for _i0 := 0; _i0 <= 1; _i0, v_0, v_1 = _i0+1, v_1, v_0 {
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x := v_0
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if v_1.Op != OpAdd8 {
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continue
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}
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_ = v_1.Args[1]
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v_1_0 := v_1.Args[0]
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v_1_1 := v_1.Args[1]
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for _i1 := 0; _i1 <= 1; _i1, v_1_0, v_1_1 = _i1+1, v_1_1, v_1_0 {
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y := v_1_0
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if v_1_1.Op != OpSub8 {
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continue
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}
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_ = v_1_1.Args[1]
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z := v_1_1.Args[0]
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if x != v_1_1.Args[1] {
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continue
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}
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v.reset(OpAdd8)
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v.AddArg2(y, z)
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return true
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}
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}
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break
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}
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// match: (Add8 (Add8 i:(Const8 <t>) z) x)
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// cond: (z.Op != OpConst8 && x.Op != OpConst8)
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// result: (Add8 i (Add8 <t> z x))
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@ -22590,6 +22774,42 @@ func rewriteValuegeneric_OpSub16(v *Value) bool {
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}
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break
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}
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// match: (Sub16 (Sub16 x y) x)
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// result: (Neg16 y)
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for {
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if v_0.Op != OpSub16 {
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break
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}
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y := v_0.Args[1]
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x := v_0.Args[0]
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if x != v_1 {
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break
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}
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v.reset(OpNeg16)
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v.AddArg(y)
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return true
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}
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// match: (Sub16 x (Add16 x y))
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// result: (Neg16 y)
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for {
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x := v_0
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if v_1.Op != OpAdd16 {
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break
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}
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_ = v_1.Args[1]
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v_1_0 := v_1.Args[0]
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v_1_1 := v_1.Args[1]
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for _i0 := 0; _i0 <= 1; _i0, v_1_0, v_1_1 = _i0+1, v_1_1, v_1_0 {
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if x != v_1_0 {
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continue
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}
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y := v_1_1
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v.reset(OpNeg16)
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v.AddArg(y)
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return true
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}
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break
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}
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// match: (Sub16 x (Sub16 i:(Const16 <t>) z))
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// cond: (z.Op != OpConst16 && x.Op != OpConst16)
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// result: (Sub16 (Add16 <t> x z) i)
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@ -22869,6 +23089,42 @@ func rewriteValuegeneric_OpSub32(v *Value) bool {
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}
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break
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}
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// match: (Sub32 (Sub32 x y) x)
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// result: (Neg32 y)
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for {
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if v_0.Op != OpSub32 {
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break
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}
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y := v_0.Args[1]
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x := v_0.Args[0]
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if x != v_1 {
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break
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}
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v.reset(OpNeg32)
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v.AddArg(y)
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return true
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}
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// match: (Sub32 x (Add32 x y))
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// result: (Neg32 y)
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for {
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x := v_0
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if v_1.Op != OpAdd32 {
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break
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}
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_ = v_1.Args[1]
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v_1_0 := v_1.Args[0]
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v_1_1 := v_1.Args[1]
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for _i0 := 0; _i0 <= 1; _i0, v_1_0, v_1_1 = _i0+1, v_1_1, v_1_0 {
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if x != v_1_0 {
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continue
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}
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y := v_1_1
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v.reset(OpNeg32)
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v.AddArg(y)
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return true
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}
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break
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}
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// match: (Sub32 x (Sub32 i:(Const32 <t>) z))
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// cond: (z.Op != OpConst32 && x.Op != OpConst32)
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// result: (Sub32 (Add32 <t> x z) i)
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@ -23172,6 +23428,42 @@ func rewriteValuegeneric_OpSub64(v *Value) bool {
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}
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break
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}
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// match: (Sub64 (Sub64 x y) x)
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// result: (Neg64 y)
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for {
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if v_0.Op != OpSub64 {
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break
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}
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y := v_0.Args[1]
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x := v_0.Args[0]
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if x != v_1 {
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break
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}
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v.reset(OpNeg64)
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v.AddArg(y)
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return true
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}
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// match: (Sub64 x (Add64 x y))
|
||||
// result: (Neg64 y)
|
||||
for {
|
||||
x := v_0
|
||||
if v_1.Op != OpAdd64 {
|
||||
break
|
||||
}
|
||||
_ = v_1.Args[1]
|
||||
v_1_0 := v_1.Args[0]
|
||||
v_1_1 := v_1.Args[1]
|
||||
for _i0 := 0; _i0 <= 1; _i0, v_1_0, v_1_1 = _i0+1, v_1_1, v_1_0 {
|
||||
if x != v_1_0 {
|
||||
continue
|
||||
}
|
||||
y := v_1_1
|
||||
v.reset(OpNeg64)
|
||||
v.AddArg(y)
|
||||
return true
|
||||
}
|
||||
break
|
||||
}
|
||||
// match: (Sub64 x (Sub64 i:(Const64 <t>) z))
|
||||
// cond: (z.Op != OpConst64 && x.Op != OpConst64)
|
||||
// result: (Sub64 (Add64 <t> x z) i)
|
||||
|
|
@ -23475,6 +23767,42 @@ func rewriteValuegeneric_OpSub8(v *Value) bool {
|
|||
}
|
||||
break
|
||||
}
|
||||
// match: (Sub8 (Sub8 x y) x)
|
||||
// result: (Neg8 y)
|
||||
for {
|
||||
if v_0.Op != OpSub8 {
|
||||
break
|
||||
}
|
||||
y := v_0.Args[1]
|
||||
x := v_0.Args[0]
|
||||
if x != v_1 {
|
||||
break
|
||||
}
|
||||
v.reset(OpNeg8)
|
||||
v.AddArg(y)
|
||||
return true
|
||||
}
|
||||
// match: (Sub8 x (Add8 x y))
|
||||
// result: (Neg8 y)
|
||||
for {
|
||||
x := v_0
|
||||
if v_1.Op != OpAdd8 {
|
||||
break
|
||||
}
|
||||
_ = v_1.Args[1]
|
||||
v_1_0 := v_1.Args[0]
|
||||
v_1_1 := v_1.Args[1]
|
||||
for _i0 := 0; _i0 <= 1; _i0, v_1_0, v_1_1 = _i0+1, v_1_1, v_1_0 {
|
||||
if x != v_1_0 {
|
||||
continue
|
||||
}
|
||||
y := v_1_1
|
||||
v.reset(OpNeg8)
|
||||
v.AddArg(y)
|
||||
return true
|
||||
}
|
||||
break
|
||||
}
|
||||
// match: (Sub8 x (Sub8 i:(Const8 <t>) z))
|
||||
// cond: (z.Op != OpConst8 && x.Op != OpConst8)
|
||||
// result: (Sub8 (Add8 <t> x z) i)
|
||||
|
|
|
|||
|
|
@ -84,6 +84,30 @@ func NegAddFromConstNeg(a int) int {
|
|||
return c
|
||||
}
|
||||
|
||||
func SubSubNegSimplify(a, b int) int {
|
||||
// amd64:"NEGQ"
|
||||
r := (a - b) - a
|
||||
return r
|
||||
}
|
||||
|
||||
func SubAddSimplify(a, b int) int {
|
||||
// amd64:-"SUBQ",-"ADDQ"
|
||||
r := a + (b - a)
|
||||
return r
|
||||
}
|
||||
|
||||
func SubAddNegSimplify(a, b int) int {
|
||||
// amd64:"NEGQ",-"ADDQ",-"SUBQ"
|
||||
r := a - (b + a)
|
||||
return r
|
||||
}
|
||||
|
||||
func AddAddSubSimplify(a, b, c int) int {
|
||||
// amd64:-"SUBQ"
|
||||
r := a + (b + (c - a))
|
||||
return r
|
||||
}
|
||||
|
||||
// -------------------- //
|
||||
// Multiplication //
|
||||
// -------------------- //
|
||||
|
|
|
|||
Loading…
Reference in a new issue