[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 #7 from Peter Varga <pvarga at inf.u-szeged.hu>  2010-09-15 07:19:01 PST ---
(In reply to comment #6)
> Do you know why v8-regexp got slower?

I made some other measurements:
- I increased the number of iterations in the v8-regexp benchmark. The ratio of the difference between the two results 
didn't increase.
- I just measured with the parser's patch (https://bugs.webkit.org/show_bug.cgi?id=45748). I noticed that the slow-down still remains.
- On another machine the v8 benchmark's results were different. v8-regexp was faster than the reference but 
other tests' (which don't contain regular expressions) performance results were different. I think it is caused by deviation.

It looks like the slow-down with v8-regexp is caused by the beginning character collecting in the parser.
I'm working on this problem.

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