RESOLVED FIXED 153897
REGRESSION(192409): Cannot rely on add32() to zero-extend 
https://bugs.webkit.org/show_bug.cgi?id=153897
Summary REGRESSION(192409): Cannot rely on add32() to zero-extend
Filip Pizlo
Reported 2016-02-04 15:05:07 PST
Callers of add32() and other 32-bit arithmetic ops rely on the fact that the destination register is zero-extended. The optimizations in r192409 broke this feature, and this causes crashes on some obscure code.
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Add attachment proposed patch, testcase, etc.
Filip Pizlo
Comment 1 2016-02-04 15:16:34 PST
rdar://problem/24289839
Filip Pizlo
Comment 2 2016-02-04 15:20:26 PST
I tried writing a test, but actually hitting this issue is sooooper hard.
Filip Pizlo
Comment 3 2016-02-04 15:23:58 PST
Landed in http://trac.webkit.org/changeset/196152
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