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overflow fix

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Originally committed as revision 3250 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2004-06-25 18:39:57 +00:00
parent 57c4d4051e
commit 8176bd1a46
1 changed files with 3 additions and 2 deletions
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5
tests/tiny_psnr.c
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@ -68,9 +68,10 @@ static uint64_t log16(uint64_t a){
a<<=16;
for(i=19;i>=0;i--){
if(a<(exp16_table[i]<<16)) continue;
int64_t b= exp16_table[i];
if(a<(b<<16)) continue;
out |= 1<<i;
a = ((a<<16) + exp16_table[i]/2)/exp16_table[i];
a = ((a/b)<<16) + (((a%b)<<16) + b/2)/b;
}
return out;
}