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avutil/softfloat: Fix overflows in shifts in av_cmp_sf() and av_gt_sf()

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Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2015-11-08 14:13:42 +01:00
parent df2a2117d2
commit cee3c9d29a
1 changed files with 8 additions and 4 deletions
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12
libavutil/softfloat.h
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@ -119,15 +119,19 @@ static inline av_const SoftFloat av_div_sf(SoftFloat a, SoftFloat b){
static inline av_const int av_cmp_sf(SoftFloat a, SoftFloat b){ static inline av_const int av_cmp_sf(SoftFloat a, SoftFloat b){
int t= a.exp - b.exp; int t= a.exp - b.exp;
if(t<0) return (a.mant >> (-t)) - b.mant ; if (t <-31) return - b.mant ;
else return a.mant - (b.mant >> t); else if (t < 0) return (a.mant >> (-t)) - b.mant ;
else if (t < 32) return a.mant - (b.mant >> t);
else return a.mant ;
} }
static inline av_const int av_gt_sf(SoftFloat a, SoftFloat b) static inline av_const int av_gt_sf(SoftFloat a, SoftFloat b)
{ {
int t= a.exp - b.exp; int t= a.exp - b.exp;
if(t<0) return (a.mant >> (-t)) > b.mant ; if (t <-31) return 0;
else return a.mant > (b.mant >> t); else if (t < 0) return (a.mant >> (-t)) > b.mant ;
else if (t < 32) return a.mant > (b.mant >> t);
else return 1;
} }
static inline av_const SoftFloat av_add_sf(SoftFloat a, SoftFloat b){ static inline av_const SoftFloat av_add_sf(SoftFloat a, SoftFloat b){