[Webkit-unassigned] [Bug 61306] New: Is the YARR begin characters optimization still a win?

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=61306

           Summary: Is the YARR begin characters optimization still a win?
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: barraclough at apple.com


It looks like the benefit of this optimization may have been lost since the BOL optimizations went in ('once through' flag).

Disabling this optimization seems to have no impact on SunSpider performance, and I measure a 2% win on v8 w/ YARR interpreter by disabling.

If disabling will simplify the code, fix bugs & improve performance, than that is what we should do.

Do we have evidence that this is still a win?

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