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Fixed issue with previous changes in glibc PRNG

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With the previous changes the PRNG was faster but didn't work on all instances.
This commit is contained in:
wiire-a 2018-01-11 15:23:16 +01:00
parent 7acd739002
commit 0584a78d9b
1 changed files with 6 additions and 2 deletions
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8
src/random/glibc_random_yura.c
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@ -26,7 +26,9 @@ static inline uint32_t *glibc_fast_nonce(uint32_t seed, uint32_t *dest)
/* This does: seed = (16807LL * seed) % 0x7fffffff
using the sum of digits method which works for mod N, base N+1 */
const uint64_t p = 16807ULL * seed; /* Seed is always positive (31 bits) */
/* Doesn't work for seed = 0x7fffffff or 0xfffffffe */
uint64_t p = 16807ULL * seed;
p = (p >> 31) + (p & 0x7fffffff);
seed = (p >> 31) + (p & 0x7fffffff);
}
dest[0] = word0 >> 1;
@ -45,7 +47,9 @@ static inline uint32_t glibc_fast_seed(uint32_t seed)
/* This does: seed = (16807LL * seed) % 0x7fffffff
using the sum of digits method which works for mod N, base N+1 */
const uint64_t p = 16807ULL * seed; /* Seed is always positive (31 bits) */
/* Doesn't work for seed = 0x7fffffff or 0xfffffffe */
uint64_t p = 16807ULL * seed;
p = (p >> 31) + (p & 0x7fffffff);
seed = (p >> 31) + (p & 0x7fffffff);
}
return (word0 + seed * glibc_seed_tbl[33]) >> 1;