[Webkit-unassigned] [Bug 45751] Extend YARR Interpreter with beginning character look-up optimization

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=45751





--- Comment #9 from Michael Saboff <msaboff at apple.com>  2010-10-01 14:08:27 PST ---
I ran some tests on patch #4 of 45748 and this patch on a MacPro.

The performance changes I saw are:

   SunSpider  base: 274.0  with mods: 273.8 (+.1%)
   regexp-dna base: 16.8 with mods: 16.0 (+5%)
  V8 Base base: 1778.7 with mods: 1778.6 (no change)
  v8-regexp base:174.1 with mods: 172.5 (+.9%)

The concern now is why the total v8 time is unchanged with a 1.6ms improvement on v8-regexp.  I didn't analyze what other tests did with the patches.  Note that since we don't see any regression, I believe we can move forward with this change.

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