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regexp: reduce allocations at makeOnePass
It reduces needless allocations on compiling onepass regex.
Following CL 38750
name old time/op new time/op delta
CompileOnepass/^(?:(?:(?:.(?:$))?))...-4 5.75µs ± 1% 5.51µs ± 2% -4.25% (p=0.008 n=5+5)
CompileOnepass/^abcd$-4 4.76µs ± 0% 4.52µs ± 1% -5.06% (p=0.008 n=5+5)
CompileOnepass/^(?:(?:a{0,})*?)$-4 5.56µs ± 0% 5.56µs ± 3% ~ (p=0.524 n=5+5)
CompileOnepass/^(?:(?:a+)*)$-4 5.09µs ± 0% 5.15µs ± 5% ~ (p=0.690 n=5+5)
CompileOnepass/^(?:(?:a|(?:aa)))$-4 6.53µs ± 0% 6.43µs ± 5% ~ (p=0.151 n=5+5)
CompileOnepass/^(?:[^\s\S])$-4 4.05µs ± 1% 4.00µs ± 2% ~ (p=0.095 n=5+5)
CompileOnepass/^(?:(?:(?:a*)+))$-4 5.47µs ± 0% 5.36µs ± 1% -1.91% (p=0.008 n=5+5)
CompileOnepass/^[a-c]+$-4 4.13µs ± 1% 4.05µs ± 0% -2.07% (p=0.008 n=5+5)
CompileOnepass/^[a-c]*$-4 4.59µs ± 2% 4.93µs ± 7% +7.30% (p=0.016 n=5+5)
CompileOnepass/^(?:a*)$-4 4.67µs ± 1% 4.82µs ± 8% ~ (p=0.730 n=4+5)
CompileOnepass/^(?:(?:aa)|a)$-4 6.43µs ± 1% 6.18µs ± 1% -3.91% (p=0.008 n=5+5)
CompileOnepass/^...$-4 4.71µs ± 0% 4.31µs ± 1% -8.51% (p=0.008 n=5+5)
CompileOnepass/^(?:a|(?:aa))$-4 6.37µs ± 0% 6.17µs ± 0% -3.23% (p=0.008 n=5+5)
CompileOnepass/^a((b))c$-4 6.85µs ± 1% 6.50µs ± 1% -5.15% (p=0.008 n=5+5)
CompileOnepass/^a.[l-nA-Cg-j]?e$-4 6.99µs ± 1% 6.66µs ± 1% -4.81% (p=0.008 n=5+5)
CompileOnepass/^a((b))$-4 6.15µs ± 1% 5.87µs ± 0% -4.57% (p=0.008 n=5+5)
CompileOnepass/^a(?:(b)|(c))c$-4 8.62µs ± 1% 8.21µs ± 1% -4.77% (p=0.008 n=5+5)
CompileOnepass/^a(?:b|c)$-4 5.76µs ±42% 4.42µs ± 1% -23.35% (p=0.008 n=5+5)
CompileOnepass/^a(?:b?|c)$-4 7.17µs ± 6% 6.86µs ± 0% -4.39% (p=0.008 n=5+5)
CompileOnepass/^a(?:b?|c+)$-4 8.08µs ± 2% 7.67µs ± 2% -4.97% (p=0.008 n=5+5)
CompileOnepass/^a(?:bc)+$-4 5.53µs ± 3% 5.35µs ± 1% -3.34% (p=0.008 n=5+5)
CompileOnepass/^a(?:[bcd])+$-4 5.08µs ± 1% 4.98µs ± 0% -2.02% (p=0.008 n=5+5)
CompileOnepass/^a((?:[bcd])+)$-4 6.49µs ± 1% 6.29µs ± 1% -3.03% (p=0.008 n=5+5)
CompileOnepass/^a(:?b|c)*d$-4 11.8µs ± 1% 11.4µs ± 3% -3.98% (p=0.008 n=5+5)
CompileOnepass/^.bc(d|e)*$-4 8.02µs ± 1% 7.54µs ± 1% -6.00% (p=0.008 n=5+5)
CompileOnepass/^loooooooooooooooooo...-4 228µs ±18% 196µs ± 0% -14.02% (p=0.016 n=5+4)
name old alloc/op new alloc/op delta
CompileOnepass/^(?:(?:(?:.(?:$))?))...-4 3.41kB ± 0% 3.38kB ± 0% -0.94% (p=0.008 n=5+5)
CompileOnepass/^abcd$-4 2.75kB ± 0% 2.74kB ± 0% -0.29% (p=0.008 n=5+5)
CompileOnepass/^(?:(?:a{0,})*?)$-4 3.34kB ± 0% 3.34kB ± 0% ~ (all equal)
CompileOnepass/^(?:(?:a+)*)$-4 2.95kB ± 0% 2.95kB ± 0% ~ (all equal)
CompileOnepass/^(?:(?:a|(?:aa)))$-4 3.75kB ± 0% 3.74kB ± 0% -0.43% (p=0.008 n=5+5)
CompileOnepass/^(?:[^\s\S])$-4 2.46kB ± 0% 2.45kB ± 0% -0.49% (p=0.008 n=5+5)
CompileOnepass/^(?:(?:(?:a*)+))$-4 3.13kB ± 0% 3.13kB ± 0% ~ (all equal)
CompileOnepass/^[a-c]+$-4 2.48kB ± 0% 2.48kB ± 0% ~ (all equal)
CompileOnepass/^[a-c]*$-4 2.52kB ± 0% 2.52kB ± 0% ~ (all equal)
CompileOnepass/^(?:a*)$-4 2.63kB ± 0% 2.63kB ± 0% ~ (all equal)
CompileOnepass/^(?:(?:aa)|a)$-4 3.64kB ± 0% 3.62kB ± 0% -0.44% (p=0.008 n=5+5)
CompileOnepass/^...$-4 2.91kB ± 0% 2.87kB ± 0% -1.37% (p=0.008 n=5+5)
CompileOnepass/^(?:a|(?:aa))$-4 3.64kB ± 0% 3.62kB ± 0% -0.44% (p=0.008 n=5+5)
CompileOnepass/^a((b))c$-4 4.39kB ± 0% 4.38kB ± 0% -0.18% (p=0.008 n=5+5)
CompileOnepass/^a.[l-nA-Cg-j]?e$-4 4.32kB ± 0% 4.30kB ± 0% -0.56% (p=0.008 n=5+5)
CompileOnepass/^a((b))$-4 4.06kB ± 0% 4.05kB ± 0% -0.39% (p=0.008 n=5+5)
CompileOnepass/^a(?:(b)|(c))c$-4 5.31kB ± 0% 5.30kB ± 0% -0.15% (p=0.008 n=5+5)
CompileOnepass/^a(?:b|c)$-4 2.88kB ± 0% 2.87kB ± 0% -0.28% (p=0.008 n=5+5)
CompileOnepass/^a(?:b?|c)$-4 4.36kB ± 0% 4.35kB ± 0% -0.18% (p=0.008 n=5+5)
CompileOnepass/^a(?:b?|c+)$-4 4.59kB ± 0% 4.58kB ± 0% -0.17% (p=0.008 n=5+5)
CompileOnepass/^a(?:bc)+$-4 3.15kB ± 0% 3.15kB ± 0% ~ (all equal)
CompileOnepass/^a(?:[bcd])+$-4 2.94kB ± 0% 2.94kB ± 0% ~ (all equal)
CompileOnepass/^a((?:[bcd])+)$-4 4.09kB ± 0% 4.08kB ± 0% -0.20% (p=0.008 n=5+5)
CompileOnepass/^a(:?b|c)*d$-4 6.15kB ± 0% 6.10kB ± 0% -0.78% (p=0.008 n=5+5)
CompileOnepass/^.bc(d|e)*$-4 4.47kB ± 0% 4.46kB ± 0% -0.36% (p=0.008 n=5+5)
CompileOnepass/^loooooooooooooooooo...-4 135kB ± 0% 135kB ± 0% ~ (p=0.810 n=5+5)
name old allocs/op new allocs/op delta
CompileOnepass/^(?:(?:(?:.(?:$))?))...-4 49.0 ± 0% 47.0 ± 0% -4.08% (p=0.008 n=5+5)
CompileOnepass/^abcd$-4 41.0 ± 0% 41.0 ± 0% ~ (all equal)
CompileOnepass/^(?:(?:a{0,})*?)$-4 49.0 ± 0% 49.0 ± 0% ~ (all equal)
CompileOnepass/^(?:(?:a+)*)$-4 44.0 ± 0% 44.0 ± 0% ~ (all equal)
CompileOnepass/^(?:(?:a|(?:aa)))$-4 54.0 ± 0% 54.0 ± 0% ~ (all equal)
CompileOnepass/^(?:[^\s\S])$-4 33.0 ± 0% 33.0 ± 0% ~ (all equal)
CompileOnepass/^(?:(?:(?:a*)+))$-4 46.0 ± 0% 46.0 ± 0% ~ (all equal)
CompileOnepass/^[a-c]+$-4 36.0 ± 0% 36.0 ± 0% ~ (all equal)
CompileOnepass/^[a-c]*$-4 41.0 ± 0% 41.0 ± 0% ~ (all equal)
CompileOnepass/^(?:a*)$-4 42.0 ± 0% 42.0 ± 0% ~ (all equal)
CompileOnepass/^(?:(?:aa)|a)$-4 53.0 ± 0% 53.0 ± 0% ~ (all equal)
CompileOnepass/^...$-4 43.0 ± 0% 39.0 ± 0% -9.30% (p=0.008 n=5+5)
CompileOnepass/^(?:a|(?:aa))$-4 53.0 ± 0% 53.0 ± 0% ~ (all equal)
CompileOnepass/^a((b))c$-4 53.0 ± 0% 53.0 ± 0% ~ (all equal)
CompileOnepass/^a.[l-nA-Cg-j]?e$-4 58.0 ± 0% 56.0 ± 0% -3.45% (p=0.008 n=5+5)
CompileOnepass/^a((b))$-4 47.0 ± 0% 47.0 ± 0% ~ (all equal)
CompileOnepass/^a(?:(b)|(c))c$-4 65.0 ± 0% 65.0 ± 0% ~ (all equal)
CompileOnepass/^a(?:b|c)$-4 40.0 ± 0% 40.0 ± 0% ~ (all equal)
CompileOnepass/^a(?:b?|c)$-4 57.0 ± 0% 57.0 ± 0% ~ (all equal)
CompileOnepass/^a(?:b?|c+)$-4 63.0 ± 0% 63.0 ± 0% ~ (all equal)
CompileOnepass/^a(?:bc)+$-4 46.0 ± 0% 46.0 ± 0% ~ (all equal)
CompileOnepass/^a(?:[bcd])+$-4 43.0 ± 0% 43.0 ± 0% ~ (all equal)
CompileOnepass/^a((?:[bcd])+)$-4 49.0 ± 0% 49.0 ± 0% ~ (all equal)
CompileOnepass/^a(:?b|c)*d$-4 105 ± 0% 101 ± 0% -3.81% (p=0.008 n=5+5)
CompileOnepass/^.bc(d|e)*$-4 62.0 ± 0% 60.0 ± 0% -3.23% (p=0.008 n=5+5)
CompileOnepass/^loooooooooooooooooo...-4 1.09k ± 0% 1.09k ± 0% ~ (all equal)
Fixes #19735
Change-Id: Ib90e18e1b06166407b26b2a68b88afbb1f486024
Reviewed-on: https://go-review.googlesource.com/38751
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
haya14busa
Brad Fitzpatrick
parent
8a5175df35
commit
fbe6723903
@ -350,17 +350,17 @@ func makeOnePass(p *onePassProg) *onePassProg {
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m[pc] = m[inst.Out]
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// pass matching runes back through these no-ops.
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onePassRunes[pc] = append([]rune{}, onePassRunes[inst.Out]...)
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inst.Next = []uint32{}
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for i := len(onePassRunes[pc]) / 2; i >= 0; i-- {
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inst.Next = append(inst.Next, inst.Out)
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inst.Next = make([]uint32, len(onePassRunes[pc])/2+1)
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for i := range inst.Next {
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inst.Next[i] = inst.Out
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}
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case syntax.InstEmptyWidth:
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ok = check(inst.Out, m)
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m[pc] = m[inst.Out]
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onePassRunes[pc] = append([]rune{}, onePassRunes[inst.Out]...)
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inst.Next = []uint32{}
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for i := len(onePassRunes[pc]) / 2; i >= 0; i-- {
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inst.Next = append(inst.Next, inst.Out)
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inst.Next = make([]uint32, len(onePassRunes[pc])/2+1)
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for i := range inst.Next {
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inst.Next[i] = inst.Out
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}
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case syntax.InstMatch, syntax.InstFail:
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m[pc] = inst.Op == syntax.InstMatch
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@ -388,9 +388,9 @@ func makeOnePass(p *onePassProg) *onePassProg {
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runes = append(runes, inst.Rune...)
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}
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onePassRunes[pc] = runes
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inst.Next = []uint32{}
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for i := len(onePassRunes[pc]) / 2; i >= 0; i-- {
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inst.Next = append(inst.Next, inst.Out)
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inst.Next = make([]uint32, len(onePassRunes[pc])/2+1)
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for i := range inst.Next {
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inst.Next[i] = inst.Out
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}
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inst.Op = syntax.InstRune
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case syntax.InstRune1:
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@ -412,9 +412,9 @@ func makeOnePass(p *onePassProg) *onePassProg {
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runes = append(runes, inst.Rune[0], inst.Rune[0])
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}
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onePassRunes[pc] = runes
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inst.Next = []uint32{}
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for i := len(onePassRunes[pc]) / 2; i >= 0; i-- {
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inst.Next = append(inst.Next, inst.Out)
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inst.Next = make([]uint32, len(onePassRunes[pc])/2+1)
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for i := range inst.Next {
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inst.Next[i] = inst.Out
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}
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inst.Op = syntax.InstRune
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case syntax.InstRuneAny:
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@ -432,9 +432,9 @@ func makeOnePass(p *onePassProg) *onePassProg {
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}
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instQueue.insert(inst.Out)
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onePassRunes[pc] = append([]rune{}, anyRuneNotNL...)
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inst.Next = []uint32{}
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for i := len(onePassRunes[pc]) / 2; i >= 0; i-- {
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inst.Next = append(inst.Next, inst.Out)
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inst.Next = make([]uint32, len(onePassRunes[pc])/2+1)
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for i := range inst.Next {
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inst.Next[i] = inst.Out
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}
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}
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return
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