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avcodec/ffv1: Simplify fold()

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No speed difference, or slightly faster (the difference is too small so it may be noise
that this appears faster)

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2019-01-27 00:49:14 +01:00
parent fe1ccc1e91
commit 5d0139d5f0
1 changed files with 1 additions and 3 deletions
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libavcodec/ffv1.h
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@ -153,9 +153,7 @@ static av_always_inline int fold(int diff, int bits)
if (bits == 8) if (bits == 8)
diff = (int8_t)diff; diff = (int8_t)diff;
else { else {
diff += 1 << (bits - 1); diff = sign_extend(diff, bits);
diff = av_mod_uintp2(diff, bits);
diff -= 1 << (bits - 1);
} }
return diff; return diff;