[Webkit-unassigned] [Bug 63505] New: DFG JIT lacks array.length caching

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=63505

           Summary: DFG JIT lacks array.length caching
           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 caching optimizations for get_by_id for array length.  The DFG JIT lacks these optimizations, and instead has to use a slow path C call for all array length accesses.

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