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Russ Cox 3ca1f28e54 regexp: evaluate context flags lazily 
There's no point in computing whether we're at the
beginning of the line if the NFA isn't going to ask.
Wait to compute that until asked.

Whatever minor slowdowns were introduced by
the conversion to pools that were not repaid by
other optimizations are taken care of by this one.

name                             old time/op    new time/op    delta
Find-12                             252ns ± 0%     260ns ± 0%   +3.34%  (p=0.000 n=10+8)
FindAllNoMatches-12                 136ns ± 4%     134ns ± 4%   -0.96%  (p=0.033 n=10+10)
FindString-12                       246ns ± 0%     250ns ± 0%   +1.46%  (p=0.000 n=8+10)
FindSubmatch-12                     332ns ± 1%     332ns ± 0%     ~     (p=0.101 n=9+10)
FindStringSubmatch-12               321ns ± 1%     322ns ± 1%     ~     (p=0.717 n=9+10)
Literal-12                         91.6ns ± 0%    92.3ns ± 0%   +0.74%  (p=0.000 n=9+9)
NotLiteral-12                      1.47µs ± 0%    1.47µs ± 0%   +0.38%  (p=0.000 n=9+8)
MatchClass-12                      2.15µs ± 0%    2.15µs ± 0%   +0.39%  (p=0.000 n=10+10)
MatchClass_InRange-12              2.09µs ± 0%    2.11µs ± 0%   +0.75%  (p=0.000 n=9+9)
ReplaceAll-12                      1.40µs ± 0%    1.40µs ± 0%     ~     (p=0.525 n=10+10)
AnchoredLiteralShortNonMatch-12    83.5ns ± 0%    81.6ns ± 0%   -2.28%  (p=0.000 n=9+10)
AnchoredLiteralLongNonMatch-12      101ns ± 0%      97ns ± 1%   -3.54%  (p=0.000 n=10+10)
AnchoredShortMatch-12               131ns ± 0%     128ns ± 0%   -2.29%  (p=0.000 n=10+9)
AnchoredLongMatch-12                268ns ± 1%     252ns ± 1%   -6.04%  (p=0.000 n=10+10)
OnePassShortA-12                    614ns ± 0%     587ns ± 1%   -4.33%  (p=0.000 n=6+10)
NotOnePassShortA-12                 552ns ± 0%     547ns ± 1%   -0.89%  (p=0.000 n=10+10)
OnePassShortB-12                    494ns ± 0%     455ns ± 0%   -7.96%  (p=0.000 n=9+9)
NotOnePassShortB-12                 411ns ± 0%     406ns ± 0%   -1.30%  (p=0.000 n=9+9)
OnePassLongPrefix-12                109ns ± 0%     108ns ± 1%     ~     (p=0.064 n=8+9)
OnePassLongNotPrefix-12             403ns ± 0%     349ns ± 0%  -13.30%  (p=0.000 n=9+8)
MatchParallelShared-12             38.9ns ± 1%    37.9ns ± 1%   -2.65%  (p=0.000 n=10+8)
MatchParallelCopied-12             39.2ns ± 1%    38.3ns ± 2%   -2.20%  (p=0.001 n=10+10)
QuoteMetaAll-12                    94.5ns ± 0%    94.7ns ± 0%   +0.18%  (p=0.043 n=10+9)
QuoteMetaNone-12                   52.7ns ± 0%    52.7ns ± 0%     ~     (all equal)
Match/Easy0/32-12                  72.2ns ± 0%    71.9ns ± 0%   -0.38%  (p=0.009 n=8+10)
Match/Easy0/1K-12                   296ns ± 1%     297ns ± 0%   +0.51%  (p=0.001 n=10+9)
Match/Easy0/32K-12                 4.57µs ± 3%    4.61µs ± 2%     ~     (p=0.280 n=10+10)
Match/Easy0/1M-12                   234µs ± 0%     234µs ± 0%     ~     (p=0.986 n=10+10)
Match/Easy0/32M-12                 7.96ms ± 0%    7.98ms ± 0%   +0.22%  (p=0.010 n=10+9)
Match/Easy0i/32-12                 1.09µs ± 0%    1.10µs ± 0%   +0.23%  (p=0.000 n=8+9)
Match/Easy0i/1K-12                 31.7µs ± 0%    31.7µs ± 0%   +0.09%  (p=0.003 n=9+8)
Match/Easy0i/32K-12                1.61ms ± 0%    1.27ms ± 1%  -21.03%  (p=0.000 n=8+10)
Match/Easy0i/1M-12                 51.4ms ± 0%    40.4ms ± 0%  -21.29%  (p=0.000 n=8+8)
Match/Easy0i/32M-12                 1.65s ± 0%     1.30s ± 1%  -21.22%  (p=0.000 n=9+9)
Match/Easy1/32-12                  67.6ns ± 1%    67.2ns ± 0%     ~     (p=0.085 n=10+9)
Match/Easy1/1K-12                   873ns ± 2%     880ns ± 0%   +0.78%  (p=0.006 n=9+7)
Match/Easy1/32K-12                 39.7µs ± 1%    34.3µs ± 3%  -13.53%  (p=0.000 n=10+10)
Match/Easy1/1M-12                  1.41ms ± 1%    1.19ms ± 3%  -15.48%  (p=0.000 n=10+10)
Match/Easy1/32M-12                 44.9ms ± 1%    38.0ms ± 2%  -15.21%  (p=0.000 n=10+10)
Match/Medium/32-12                 1.04µs ± 0%    1.03µs ± 0%   -0.57%  (p=0.000 n=9+9)
Match/Medium/1K-12                 31.2µs ± 0%    31.4µs ± 1%   +0.61%  (p=0.000 n=8+10)
Match/Medium/32K-12                1.45ms ± 1%    1.20ms ± 0%  -17.70%  (p=0.000 n=10+8)
Match/Medium/1M-12                 46.4ms ± 0%    38.4ms ± 2%  -17.32%  (p=0.000 n=6+9)
Match/Medium/32M-12                 1.49s ± 1%     1.24s ± 1%  -16.81%  (p=0.000 n=10+10)
Match/Hard/32-12                   1.47µs ± 0%    1.47µs ± 0%   -0.31%  (p=0.000 n=9+10)
Match/Hard/1K-12                   44.5µs ± 1%    44.4µs ± 0%     ~     (p=0.075 n=10+10)
Match/Hard/32K-12                  2.09ms ± 0%    1.78ms ± 7%  -14.88%  (p=0.000 n=8+10)
Match/Hard/1M-12                   67.8ms ± 5%    56.9ms ± 7%  -16.05%  (p=0.000 n=10+10)
Match/Hard/32M-12                   2.17s ± 5%     1.84s ± 6%  -15.21%  (p=0.000 n=10+10)
Match/Hard1/32-12                  7.89µs ± 0%    7.94µs ± 0%   +0.61%  (p=0.000 n=9+9)
Match/Hard1/1K-12                   246µs ± 0%     245µs ± 0%   -0.30%  (p=0.010 n=9+10)
Match/Hard1/32K-12                 8.93ms ± 0%    8.17ms ± 0%   -8.44%  (p=0.000 n=9+8)
Match/Hard1/1M-12                   286ms ± 0%     269ms ± 9%   -5.66%  (p=0.028 n=9+10)
Match/Hard1/32M-12                  9.16s ± 0%     8.61s ± 8%   -5.98%  (p=0.028 n=9+10)
Match_onepass_regex/32-12           825ns ± 0%     712ns ± 0%  -13.75%  (p=0.000 n=8+8)
Match_onepass_regex/1K-12          28.7µs ± 1%    19.8µs ± 0%  -30.99%  (p=0.000 n=9+8)
Match_onepass_regex/32K-12          950µs ± 1%     628µs ± 0%  -33.83%  (p=0.000 n=9+8)
Match_onepass_regex/1M-12          30.4ms ± 0%    20.1ms ± 0%  -33.74%  (p=0.000 n=9+8)
Match_onepass_regex/32M-12          974ms ± 1%     646ms ± 0%  -33.73%  (p=0.000 n=9+8)
CompileOnepass-12                  4.60µs ± 0%    4.59µs ± 0%     ~     (p=0.063 n=8+9)
[Geo mean]                         23.1µs         21.3µs        -7.44%

https://perf.golang.org/search?q=upload:20181004.4

Change-Id: I47cdd09f6dcde1d7c317080e9b4df42c7d0a8d24
Reviewed-on: https://go-review.googlesource.com/c/139782
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2018-10-12 17:48:41 +00:00
..
syntax regexp/syntax: don't do both linear and binary sesarch in MatchRunePos 2018-08-22 17:11:57 +00:00
testdata regexp/syntax: fix factoring of common prefixes in alternations 2016-01-08 16:41:46 +00:00
all_test.go regexp: split one-pass execution out of machine struct 2018-10-12 17:48:35 +00:00
backtrack.go regexp: evaluate context flags lazily 2018-10-12 17:48:41 +00:00
example_test.go regexp: examples for Regexp.FindIndex and Regexp.FindAllSubmatchIndex methods 2018-06-30 01:04:30 +00:00
exec.go regexp: evaluate context flags lazily 2018-10-12 17:48:41 +00:00
exec2_test.go build: move package sources from src/pkg to src 2014-09-08 00:08:51 -04:00
exec_test.go regexp: split one-pass execution out of machine struct 2018-10-12 17:48:35 +00:00
find_test.go build: move package sources from src/pkg to src 2014-09-08 00:08:51 -04:00
onepass.go regexp: split one-pass execution out of machine struct 2018-10-12 17:48:35 +00:00
onepass_test.go regexp: split one-pass execution out of machine struct 2018-10-12 17:48:35 +00:00
regexp.go regexp: evaluate context flags lazily 2018-10-12 17:48:41 +00:00