[Webkit-unassigned] [Bug 14719] New: 1-5% regression in JavaScript performance

[bugzilla-daemon at webkit.org]

http://bugs.webkit.org/show_bug.cgi?id=14719

           Summary: 1-5% regression in JavaScript performance
           Product: WebKit
           Version: 522+ (nightly)
          Platform: Macintosh
        OS/Version: Mac OS X 10.4
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: mjs at apple.com


The following revision caused a measurable JS performance regression:

http://trac.webkit.org/projects/webkit/changeset/24287

This results in a 1% slowdown on JS iBench and a 5% slowdown on the "Celtic
Kane" JS benchmark. The problem is that we now always walk the scope chain
doing variable lookups, which results in extra hashtable traffic and a more
complex function.


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