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Fix for powers of 2 in RNG.

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Cubitect 2018-07-06 22:09:33 +01:00
parent 2584485efc
commit cf8c903145
1 changed files with 5 additions and 1 deletions
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6
finders.h
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@ -394,11 +394,15 @@ static inline int next(int64_t *seed, const int bits)
static inline int nextInt(int64_t *seed, const int n)
{
int bits, val;
const int m = n - 1;
if((m & n) == 0) return (int) ((n * (long)next(seed, 31)) >> 31);
do {
bits = next(seed, 31);
val = bits % n;
}
while(bits - val + (n - 1) < 0);
while(bits - val + m < 0);
return val;
}