[Webkit-unassigned] [Bug 176473] New: pdfjs performance regresses if OSR exit uses arrayModeFromStructure() for observing ArrayModes.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=176473

            Bug ID: 176473
           Summary: pdfjs performance regresses if OSR exit uses
                    arrayModeFromStructure() for observing ArrayModes.
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mark.lam at apple.com

While working on https://bugs.webkit.org/show_bug.cgi?id=175144, we saw a 18-20% regression in pdfjs.  This regression due to my changing the new OSR exit code to use arrayModeFromStructure() to compute the observed ArrayMode.  Logging shows that the observed cell is a TypeUint8 array.  Hence, arrayModeFromStructure() should have returned a more accurate ArrayMode profile, which should be better for performance.  Instead, it resulted in a performance regression.

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