RESOLVED FIXED 119874
Sometimes, the DFG uses a GetById for typed array length accesses despite profiling data that indicates that it's a typed array length access 
https://bugs.webkit.org/show_bug.cgi?id=119874
Summary Sometimes, the DFG uses a GetById for typed array length accesses despite pro...
Filip Pizlo
Reported 2013-08-15 16:52:15 PDT
It's a confusion between heuristics in DFG::ArrayMode that are assuming that you'll use ForceExit if array profiles are empty, the JIT creating empty profiles sometimes for typed array length accesses, and the FixupPhase assuming that a ForceExit ArrayMode means that it should continue using a generic GetById.
Attachments
the patch (3.44 KB, patch)
2013-08-15 16:53 PDT, Filip Pizlo 		oliver: review+
DetailsFormatted DiffDiff
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Filip Pizlo
Comment 1 2013-08-15 16:53:14 PDT
Created attachment 208870 [details] the patch
Mark Hahnenberg
Comment 2 2013-08-15 17:03:50 PDT
Comment on attachment 208870 [details] the patch r=me to fwiw.
Filip Pizlo
Comment 3 2013-08-16 10:17:40 PDT
Landed in http://trac.webkit.org/changeset/154157
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