[Webkit-unassigned] [Bug 20818] New: 'instanceof' operator is slow

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=20818

           Summary: 'instanceof' operator is slow
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: cwzwarich at uwaterloo.ca
OtherBugsDependingO 20813
             nThis:


JSObject::hasInstance() shows up as 3.1% of the Shark profile for the V8
Earley-Boyer benchmark, so we should try to speed it up a bit. The isObject()
check in the op_instanceof also shows up as 2.4% of the Shark profile, but I
will make a separate bug for that.


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