[Webkit-unassigned] [Bug 16186] New: Reduce number of c-stack-based MatchFrames
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Thu Nov 29 04:12:23 PST 2007
http://bugs.webkit.org/show_bug.cgi?id=16186
Summary: Reduce number of c-stack-based MatchFrames
Product: WebKit
Version: 523.x (Safari 3)
Platform: Macintosh
OS/Version: Mac OS X 10.4
Status: NEW
Severity: Normal
Priority: P2
Component: JavaScriptCore
AssignedTo: webkit-unassigned at lists.webkit.org
ReportedBy: eric at webkit.org
CC: mjs at apple.com, darin at apple.com, ggaren at apple.com
BugsThisDependsOn: 16185
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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