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* regexp: reduce allocs in regexp.Match for onepass regexhaya14busa2017-03-231-2/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | There were no allocations in regexp.Match for *non* onepass regex because m.matchcap length is reset to zero (ncap=0 for regexp.Match). But, as for onepass regex, m.matchcap length remains as it is even when ncap=0 and it leads needless allocations. benchmark old ns/op new ns/op delta BenchmarkMatch_onepass_regex/32-4 6465 4628 -28.41% BenchmarkMatch_onepass_regex/1K-4 208324 151558 -27.25% BenchmarkMatch_onepass_regex/32K-4 7230259 5834492 -19.30% BenchmarkMatch_onepass_regex/1M-4 234379810 166310682 -29.04% BenchmarkMatch_onepass_regex/32M-4 7903529363 4981119950 -36.98% benchmark old MB/s new MB/s speedup BenchmarkMatch_onepass_regex/32-4 4.95 6.91 1.40x BenchmarkMatch_onepass_regex/1K-4 4.92 6.76 1.37x BenchmarkMatch_onepass_regex/32K-4 4.53 5.62 1.24x BenchmarkMatch_onepass_regex/1M-4 4.47 6.30 1.41x BenchmarkMatch_onepass_regex/32M-4 4.25 6.74 1.59x benchmark old allocs new allocs delta BenchmarkMatch_onepass_regex/32-4 32 0 -100.00% BenchmarkMatch_onepass_regex/1K-4 1024 0 -100.00% BenchmarkMatch_onepass_regex/32K-4 32768 0 -100.00% BenchmarkMatch_onepass_regex/1M-4 1048576 0 -100.00% BenchmarkMatch_onepass_regex/32M-4 104559255 0 -100.00% benchmark old bytes new bytes delta BenchmarkMatch_onepass_regex/32-4 512 0 -100.00% BenchmarkMatch_onepass_regex/1K-4 16384 0 -100.00% BenchmarkMatch_onepass_regex/32K-4 524288 0 -100.00% BenchmarkMatch_onepass_regex/1M-4 16777216 0 -100.00% BenchmarkMatch_onepass_regex/32M-4 2019458128 0 -100.00% Fixes #19573 Change-Id: I033982d0003ebb0360bb40b92eb3941c781ec74d Reviewed-on: https://go-review.googlesource.com/38270 Run-TryBot: Michael Matloob <matloob@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
* regexp: reduce mallocs in Regexp.Find* and Regexp.ReplaceAll*.Aliaksandr Valialkin2016-09-061-13/+18
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This improves Regexp.Find* and Regexp.ReplaceAll* speed: name old time/op new time/op delta Find-4 345ns ± 1% 314ns ± 1% -8.94% (p=0.000 n=9+8) FindString-4 341ns ± 1% 308ns ± 0% -9.85% (p=0.000 n=10+9) FindSubmatch-4 440ns ± 1% 404ns ± 0% -8.27% (p=0.000 n=10+8) FindStringSubmatch-4 426ns ± 0% 387ns ± 0% -9.07% (p=0.000 n=10+9) ReplaceAll-4 1.75µs ± 1% 1.67µs ± 0% -4.45% (p=0.000 n=9+10) name old alloc/op new alloc/op delta Find-4 16.0B ± 0% 0.0B ±NaN% -100.00% (p=0.000 n=10+10) FindString-4 16.0B ± 0% 0.0B ±NaN% -100.00% (p=0.000 n=10+10) FindSubmatch-4 80.0B ± 0% 48.0B ± 0% -40.00% (p=0.000 n=10+10) FindStringSubmatch-4 64.0B ± 0% 32.0B ± 0% -50.00% (p=0.000 n=10+10) ReplaceAll-4 152B ± 0% 104B ± 0% -31.58% (p=0.000 n=10+10) name old allocs/op new allocs/op delta Find-4 1.00 ± 0% 0.00 ±NaN% -100.00% (p=0.000 n=10+10) FindString-4 1.00 ± 0% 0.00 ±NaN% -100.00% (p=0.000 n=10+10) FindSubmatch-4 2.00 ± 0% 1.00 ± 0% -50.00% (p=0.000 n=10+10) FindStringSubmatch-4 2.00 ± 0% 1.00 ± 0% -50.00% (p=0.000 n=10+10) ReplaceAll-4 8.00 ± 0% 5.00 ± 0% -37.50% (p=0.000 n=10+10) Fixes #15643 Change-Id: I594fe51172373e2adb98d1d25c76ca2cde54ff48 Reviewed-on: https://go-review.googlesource.com/23030 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
* all: delete dead non-test codeDominik Honnef2016-03-251-12/+0
| | | | | | | | | | | | | | | | | | | | | | | This change removes a lot of dead code. Some of the code has never been used, not even when it was first commited. The rest shouldn't have survived refactors. This change doesn't remove unused routines helpful for debugging, nor does it remove code that's used in commented out blocks of code that are only unused temporarily. Furthermore, unused constants weren't removed when they were part of a set of constants from specifications. One noteworthy omission from this CL are about 1000 lines of unused code in cmd/fix, 700 lines of which are the typechecker, which hasn't been used ever since the pre-Go 1 fixes have been removed. I wasn't sure if this code should stick around for future uses of cmd/fix or be culled as well. Change-Id: Ib714bc7e487edc11ad23ba1c3222d1fd02e4a549 Reviewed-on: https://go-review.googlesource.com/20926 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
* all: single space after period.Brad Fitzpatrick2016-03-021-1/+1
| | | | | | | | | | | | | | | | | | | | The tree's pretty inconsistent about single space vs double space after a period in documentation. Make it consistently a single space, per earlier decisions. This means contributors won't be confused by misleading precedence. This CL doesn't use go/doc to parse. It only addresses // comments. It was generated with: $ perl -i -npe 's,^(\s*// .+[a-z]\.) +([A-Z]),$1 $2,' $(git grep -l -E '^\s*//(.+\.) +([A-Z])') $ go test go/doc -update Change-Id: Iccdb99c37c797ef1f804a94b22ba5ee4b500c4f7 Reviewed-on: https://go-review.googlesource.com/20022 Reviewed-by: Rob Pike <r@golang.org> Reviewed-by: Dave Day <djd@golang.org> Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
* regexp: port RE2's bitstate backtracker to the regexp packageMichael Matloob2015-03-231-7/+23
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This is a port of RE2's bitstate backtracker, which triggers under the same conditions that the RE2 backtracker triggers. However I wasn't sure how to port over some of the optimizations in the RE2 backtracker, and there is a ~2% penalty on benchmarks that don't trigger the backtracker. benchmark old ns/op new ns/op delta BenchmarkLiteral 312 189 -39.42% BenchmarkNotLiteral 4435 3001 -32.33% BenchmarkMatchClass 5758 4378 -23.97% BenchmarkMatchClass_InRange 5385 4084 -24.16% BenchmarkReplaceAll 5291 3505 -33.76% BenchmarkAnchoredLiteralShortNonMatch 190 200 +5.26% BenchmarkAnchoredLiteralLongNonMatch 189 194 +2.65% BenchmarkAnchoredShortMatch 479 304 -36.53% BenchmarkAnchoredLongMatch 478 499 +4.39% BenchmarkOnePassShortA 791 798 +0.88% BenchmarkNotOnePassShortA 3202 1571 -50.94% BenchmarkOnePassShortB 614 633 +3.09% BenchmarkNotOnePassShortB 2685 881 -67.19% BenchmarkOnePassLongPrefix 152 154 +1.32% BenchmarkOnePassLongNotPrefix 505 533 +5.54% BenchmarkMatchEasy0_32 139 171 +23.02% BenchmarkMatchEasy0_1K 653 1797 +175.19% BenchmarkMatchEasy0_32K 12032 13346 +10.92% BenchmarkMatchEasy0_1M 462882 461272 -0.35% BenchmarkMatchEasy0_32M 15015339 15365238 +2.33% BenchmarkMatchEasy1_32 122 168 +37.70% BenchmarkMatchEasy1_1K 3339 2612 -21.77% BenchmarkMatchEasy1_32K 72330 71721 -0.84% BenchmarkMatchEasy1_1M 2545410 2652284 +4.20% BenchmarkMatchEasy1_32M 80072063 82609750 +3.17% BenchmarkMatchMedium_32 2359 1980 -16.07% BenchmarkMatchMedium_1K 75939 58593 -22.84% BenchmarkMatchMedium_32K 2450907 2501106 +2.05% BenchmarkMatchMedium_1M 78707697 80174418 +1.86% BenchmarkMatchMedium_32M 2535146010 2570896441 +1.41% BenchmarkMatchHard_32 4297 2960 -31.11% BenchmarkMatchHard_1K 133592 88997 -33.38% BenchmarkMatchHard_32K 4240445 4336907 +2.27% BenchmarkMatchHard_1M 136187006 139350238 +2.32% BenchmarkMatchHard_32M 4350855890 4478537306 +2.93% benchmark old MB/s new MB/s speedup BenchmarkMatchEasy0_32 228.74 186.11 0.81x BenchmarkMatchEasy0_1K 1565.91 569.64 0.36x BenchmarkMatchEasy0_32K 2723.31 2455.10 0.90x BenchmarkMatchEasy0_1M 2265.32 2273.22 1.00x BenchmarkMatchEasy0_32M 2234.68 2183.79 0.98x BenchmarkMatchEasy1_32 261.08 190.22 0.73x BenchmarkMatchEasy1_1K 306.59 391.91 1.28x BenchmarkMatchEasy1_32K 453.03 456.88 1.01x BenchmarkMatchEasy1_1M 411.95 395.35 0.96x BenchmarkMatchEasy1_32M 419.05 406.18 0.97x BenchmarkMatchMedium_32 13.56 16.16 1.19x BenchmarkMatchMedium_1K 13.48 17.48 1.30x BenchmarkMatchMedium_32K 13.37 13.10 0.98x BenchmarkMatchMedium_1M 13.32 13.08 0.98x BenchmarkMatchMedium_32M 13.24 13.05 0.99x BenchmarkMatchHard_32 7.45 10.81 1.45x BenchmarkMatchHard_1K 7.67 11.51 1.50x BenchmarkMatchHard_32K 7.73 7.56 0.98x BenchmarkMatchHard_1M 7.70 7.52 0.98x BenchmarkMatchHard_32M 7.71 7.49 0.97x Fixes #4154 Change-Id: Iff7fb9507f0872b320d08afc08679751ed1b28bc Reviewed-on: https://go-review.googlesource.com/2153 Reviewed-by: Russ Cox <rsc@golang.org>
* build: move package sources from src/pkg to srcRuss Cox2014-09-081-0/+452
Preparation was in CL 134570043. This CL contains only the effect of 'hg mv src/pkg/* src'. For more about the move, see golang.org/s/go14nopkg.
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