pitdicker / small-rngs Goto Github PK
View Code? Open in Web Editor NEWA collection of small PRNGs
A collection of small PRNGs
This lib outputs the full 64-bits while the reference implementation only outputs 32-bits. (It also adds the Weyl sequence after squaring instead of before squaring)
inline static uint32_t msws() {
x *= x; x += (w += s); return x = (x>>32) | (x<<32);
}
small-rngs/src/xoroshiro_mt.rs
Line 37 in d74e117
Two things I don't understand about this construction:
next_u32
then called it twice for next_u64
. Obviously discarding more bits can improve quality at the cost of performance, but why not just implement next_u64
directly โ that would be much faster, right?Did this design come from O'Neill's work? I don't see an implementation on her site.
Also worth noting is Xoroshiro128** which is similar, but uses the same construction critiqued here to "multiply" the result. I'm not really sure what to make of that, other than this "fast multiplication" has worse avalanche than a regular 64-bit multiplication.
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