[Webkit-unassigned] [Bug 116151] New: Make PNGImageDecoder::rowAvailable auto-vectorizable

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=116151

           Summary: Make PNGImageDecoder::rowAvailable auto-vectorizable
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Images
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: allan.jensen at digia.com


After analyzing PNG decoding performance, I noticed that depending on the image somewhere between 25-50% of the decoding time is spend under PNGImageDecoder::rowAvailable simply populating the ImageFrame.

This loop should be vectorizable giving at least 2x speedup in PNGImageDecoder::rowAvailable and thus 12-25% speed-up on PNG decoding in total.

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