[Webkit-unassigned] [Bug 63173] New: DFG non-speculative JIT lacks basic optimizations for GetById and GetByVal

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=63173

           Summary: DFG non-speculative JIT lacks basic optimizations for
                    GetById and GetByVal
           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


The main JSC JIT has optimizations to speed up GetById and GetByVal for common cases.  The DFG speculative JIT has some of these optimizations as well.  But the non-speculative JIT always calls out to C, potentially resulting in performance regressions on code that fails speculation.

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