[Webkit-unassigned] [Bug 38557] New: r58526 introduced a ~30% regression on Dromaeo JS lib

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=38557

           Summary: r58526 introduced a ~30% regression on Dromaeo JS lib
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Mac OS X 10.5
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: barraclough at apple.com
                CC: darin at apple.com, antonm at chromium.org


This change -> http://trac.webkit.org/changeset/58526

Regressed Dromaeo JS lib tests by ~30% on my machine.  That said, it was about
an equally huge win on Dromaeo DOM core (awesome!), but given our
no-regressions policy I'd imagine we'll need to find a way to avoid the
performance hit if we are to keep this in the tree.  Might be best to revert &
re-land a new patch, once this issue has been resolved?

The hit seems to mostly fall on the CSS style & DOM traversal tests.

http://dromaeo.com/?id=102238
http://dromaeo.com/?id=102247

Darin, cc'ing you as reviewer of the original patch.

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