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authorRonald S. Bultje <rsbultje@gmail.com>2016-10-14 13:01:27 -0400
committerMichael Niedermayer <michael@niedermayer.cc>2016-12-05 18:29:12 +0100
commit2dcc0bce3924ebc96ed7f4956b007d4b84a99750 (patch)
tree510ecc59c3f69e910e4923ee45198dc2c1dc2368 /libavcodec/h264dsp.h
parent0e3dc45ce81f9c9db5a6a6e2df96670164e82dec (diff)
downloadffmpeg-2dcc0bce3924ebc96ed7f4956b007d4b84a99750.tar.gz
vp9: change order of operations in adapt_prob().
This is intended to workaround bug "665 Integer Divide Instruction May Cause Unpredictable Behavior" on some early AMD CPUs, which causes a div-by-zero in this codepath, such as reported in Mozilla bug #1293996. Note that this isn't guaranteed to fix the bug, since a compiler is free to reorder instructions that don't depend on each other. However, it appears to fix the bug in Firefox, and a similar patch was applied to libvpx also (see Chrome bug #599899). (cherry picked from commit be885da3427c5d9a6fa68229d16318afffe67193) Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Diffstat (limited to 'libavcodec/h264dsp.h')
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