[Webkit-unassigned] [Bug 42857] New: Inefficient Handling of Shift and Unshift

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=42857

           Summary: Inefficient Handling of Shift and Unshift
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: Mac OS X 10.6
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: msaboff at apple.com


The array code sometimes re-allocates and always copies data when performing shift and unshift operations.

This defect is related to  <rdar://problem/8086123> 12x slower than Chrome on Dromaeo JS arrays test.

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