RESOLVED INVALID 16186
Reduce number of c-stack-based MatchFrames 
https://bugs.webkit.org/show_bug.cgi?id=16186
Summary Reduce number of c-stack-based MatchFrames
Eric Seidel (no email)
Reported 2007-11-29 04:12:23 PST
Reduce number of c-stack-based MatchFrames I believe the credit for this idea goes to Darin, I heard about it through Maciej. Currently we allocate space for 16 match frames every time we call into match(). That's excessive, since very very very few regexps ever go beyond a few frames. Supposedly darin tried this and found that reducing to 4 frames was a big speedup. I expect we could probably reduce to 8 frames w/o worrying too much about affecting real-world performance. Until bug 16185 is fixed, we always use 2 frames for every regexp. :(
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Eric Seidel (no email)
Comment 1 2007-11-29 05:06:11 PST
I just tested reducing FRAMES_ON_STACK to 8 and 4, and saw no change in SunSpider. Unless I missed something, we might just want to close this bug.
Gavin Barraclough
Comment 2 2011-09-06 22:31:16 PDT
This is a proposed optimization for PCRE; we no longer use PCRE.
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