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Fixed issue with previous changes in glibc PRNG
With the previous changes the PRNG was faster but didn't work on all instances.
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@ -26,7 +26,9 @@ static inline uint32_t *glibc_fast_nonce(uint32_t seed, uint32_t *dest)
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/* This does: seed = (16807LL * seed) % 0x7fffffff
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/* This does: seed = (16807LL * seed) % 0x7fffffff
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using the sum of digits method which works for mod N, base N+1 */
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using the sum of digits method which works for mod N, base N+1 */
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const uint64_t p = 16807ULL * seed; /* Seed is always positive (31 bits) */
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/* Doesn't work for seed = 0x7fffffff or 0xfffffffe */
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uint64_t p = 16807ULL * seed;
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p = (p >> 31) + (p & 0x7fffffff);
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seed = (p >> 31) + (p & 0x7fffffff);
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seed = (p >> 31) + (p & 0x7fffffff);
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}
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}
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dest[0] = word0 >> 1;
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dest[0] = word0 >> 1;
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@ -45,7 +47,9 @@ static inline uint32_t glibc_fast_seed(uint32_t seed)
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/* This does: seed = (16807LL * seed) % 0x7fffffff
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/* This does: seed = (16807LL * seed) % 0x7fffffff
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using the sum of digits method which works for mod N, base N+1 */
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using the sum of digits method which works for mod N, base N+1 */
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const uint64_t p = 16807ULL * seed; /* Seed is always positive (31 bits) */
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/* Doesn't work for seed = 0x7fffffff or 0xfffffffe */
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uint64_t p = 16807ULL * seed;
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p = (p >> 31) + (p & 0x7fffffff);
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seed = (p >> 31) + (p & 0x7fffffff);
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seed = (p >> 31) + (p & 0x7fffffff);
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}
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}
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return (word0 + seed * glibc_seed_tbl[33]) >> 1;
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return (word0 + seed * glibc_seed_tbl[33]) >> 1;
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