[Webkit-unassigned] [Bug 45749] Extend YARR JIT with beginning character look-up optimization

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=45749





--- Comment #9 from Peter Varga <pvarga at inf.u-szeged.hu>  2010-09-15 11:34:28 PST ---
(In reply to comment #8)
> Any idea why this would slow down the JIT but not the interpreter? Your interpreter results show a solid improvement on v8-regexp. It's surprising that the JIT wouldn't improve as well.

I think this optimization haven't enough possibilities to make faster the pattern matching in case of v8-regexp test. Therefore the overhead of the character collecting is greater than the profit of the optimization in case of JIT.

However this optimization is more efficient in case of interpreter and the overhead of character collecting is same in both case, therefore the overhead should be negligible when the interpreter does the pattern matching.

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