[Webkit-unassigned] [Bug 98694] [Performance] Speed-up DOM tree traversal on ARM platforms

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=98694





--- Comment #4 from Benjamin Poulain <benjamin at webkit.org>  2012-10-08 18:13:01 PST ---
> I'm aware of the fact that the community doesn't prefer any platform specific code in platform independent parts of WebCore,
> but considering the performance gain we get out of this change, it deemed worth a try. Please let me know if you have any
> suggestions to do it in a much cleaner way.

This is not platform dependent code (in the sense of WebKit port), this is CPU specific code. Such change is perfectly acceptable in WebCore.

> This particular patch gives about ~16% improvement in Dromaeo CSS Selector Tests score on Krait S4, dual core @ 1.5 GHz.
> 
> http://dromaeo.com/?id=181274,181299
> 
> 181299 - Stock WebKit
> 181274 - With prefetch optimization

Please explain how you get from 181299 VS 181274 to 16% improvement.

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