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Optimize 64 bit random number generation #2224

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merged 1 commit into from Jun 30, 2022
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Optimize 64 bit random number generation #2224

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5 changes: 3 additions & 2 deletions src/util.cc
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Expand Up @@ -544,8 +544,9 @@ uint64_t rand64bit()
uint64_t base = 0;
int i;

for ( i = 1; i <= 4; ++i )
base = (base << 16) | detail::random_number();
static_assert(RAND_MAX == 2147483647); // 2^32-1
for ( i = 1; i <= 2; ++i )
base = (base << 32) | detail::random_number();
return base;
}

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