[Webkit-unassigned] [Bug 125944] REGRESSION(r156214): 11-13% regressions on Dromaeo/jslib-traverse-jquery

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=125944





--- Comment #5 from Mark Hahnenberg <mhahnenberg at apple.com>  2013-12-20 17:55:47 PST ---
The original bug was that we would be in the middle of copying, see and hole and we realize we should have done something else, and then we start copying all over again.

The fix was a simple one: first check if there's a hole, then do the copy. So you're always doing two passes over the array.

If we want to fix this regression then we need a way to start copying and then gracefully fail when we see a hole without forgetting that we had already started copying.

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