[Webkit-unassigned] [Bug 63974] New: DFG JIT virtual call implementation is inefficient

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=63974

           Summary: DFG JIT virtual call implementation is inefficient
           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: fpizlo at apple.com


When making a virtual call, only one check is necessary to see if the function needs to be compiled.  Currently, the code does two checks (first, if it's a host, and second, if it needs to be compiled).  The old JIT folded both checks into a query on the number of parameters (which would be negative if the function was neither a host function nor was compiled).  The DFG JIT should have the same optimization.

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