[Webkit-unassigned] [Bug 37571] New: Do YARR JIT fallback earlier than the JIT code generation

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=37571

           Summary: Do YARR JIT fallback earlier than the JIT code
                    generation
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: pvarga at inf.u-szeged.hu
                CC: barraclough at apple.com, zherczeg at webkit.org,
                    abecsi at webkit.org


Now the detection of the YARR JIT fallback to pcre happens during the JIT code
generation phase.
It can be done earlier in the YARR compiler phase. Thus the unnecessary code
generation can be avoided in the fallback cases.

This modification improve performance to YARR JIT when it does fallback.
The WindScorpion's email.js regexp performance test run 1.26x as fast (3463.2ms
+/- 0.4% -> 2754.4ms +/-0.4%).

You download our benchmark suit from this link:
http://www.sed.hu/webkit/?page=downloads&dl=windscorpion.zip

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