[Webkit-unassigned] [Bug 42264] Prepare YARR JIT for matching regexps with iterative parentheses

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=42264


Peter Varga <pvarga at inf.u-szeged.hu> changed:

           What    |Removed                     |Added
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  Attachment #61520|0                           |1
        is obsolete|                            |




--- Comment #3 from Peter Varga <pvarga at inf.u-szeged.hu>  2010-07-15 09:05:03 PST ---
Created an attachment (id=61669)
 --> (https://bugs.webkit.org/attachment.cgi?id=61669)
proposed patch v2

I have updated the patch to avoid the performance regression in YARR JIT.
The modified solution uses the original preallocated stack logic in case of patterns which don't contain
iterative parentheses.

These are the performance results:

          reference        modified
regexp-dna:    22.2ms +/- 1.4%    21.9ms +/- 1.0%
v8-regexp:    435.1ms +/- 1.2%    435.9ms +/- 1.2%

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