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avutil/softfloat: Fix exponent underflow in av_div_sf()

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Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 046218b212)

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2015-11-08 13:59:21 +01:00
parent 402c4a9f81
commit acd203fc0d
1 changed files with 4 additions and 1 deletions
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5
libavutil/softfloat.h
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@@ -111,7 +111,10 @@ static inline av_const SoftFloat av_mul_sf(SoftFloat a, SoftFloat b){
static inline av_const SoftFloat av_div_sf(SoftFloat a, SoftFloat b){ static inline av_const SoftFloat av_div_sf(SoftFloat a, SoftFloat b){
a.exp -= b.exp; a.exp -= b.exp;
a.mant = ((int64_t)a.mant<<(ONE_BITS+1)) / b.mant; a.mant = ((int64_t)a.mant<<(ONE_BITS+1)) / b.mant;
return av_normalize1_sf(a); a = av_normalize1_sf(a);
if (!a.mant || a.exp < MIN_EXP)
return FLOAT_0;
return a;
} }
static inline av_const int av_cmp_sf(SoftFloat a, SoftFloat b){ static inline av_const int av_cmp_sf(SoftFloat a, SoftFloat b){