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vp9: change order of operations in adapt_prob().

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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).
This commit is contained in:
Ronald S. Bultje 2016-10-14 13:01:27 -04:00
parent 490c6bda0e
commit be885da342
1 changed files with 2 additions and 3 deletions
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5
libavcodec/vp9.c
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@ -3705,11 +3705,10 @@ static av_always_inline void adapt_prob(uint8_t *p, unsigned ct0, unsigned ct1,
if (!ct)
return;
update_factor = FASTDIV(update_factor * FFMIN(ct, max_count), max_count);
p1 = *p;
p2 = ((ct0 << 8) + (ct >> 1)) / ct;
p2 = ((((int64_t) ct0) << 8) + (ct >> 1)) / ct;
p2 = av_clip(p2, 1, 255);
ct = FFMIN(ct, max_count);
update_factor = FASTDIV(update_factor * ct, max_count);
// (p1 * (256 - update_factor) + p2 * update_factor + 128) >> 8
*p = p1 + (((p2 - p1) * update_factor + 128) >> 8);