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avutil/softfloat: Fix exponent underflow in av_mul_sf()

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Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2015-11-08 13:57:19 +01:00
parent 4135a2bfd6
commit a1e3303fc0
1 changed files with 4 additions and 1 deletions
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5
libavutil/softfloat.h
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@ -98,7 +98,10 @@ static inline av_const SoftFloat av_mul_sf(SoftFloat a, SoftFloat b){
a.exp += b.exp;
av_assert2((int32_t)((a.mant * (int64_t)b.mant) >> ONE_BITS) == (a.mant * (int64_t)b.mant) >> ONE_BITS);
a.mant = (a.mant * (int64_t)b.mant) >> ONE_BITS;
return av_normalize1_sf((SoftFloat){a.mant, a.exp - 1});
a = av_normalize1_sf((SoftFloat){a.mant, a.exp - 1});
if (!a.mant || a.exp < MIN_EXP)
return FLOAT_0;
return a;
}
/**