[Uzomidy]

Looking at the PCG paper, it shows that a basic XorShift generator doesn't pass statistical tests as it gets bigger. Basically, there are some tests it never passes no matter how big it gets.

But a tiny change (XorShift*) is enough to get a generator that passes empirical statistical tests.

The page about other RNGs has lots of good info about this stuff.

[aidenn0]

Ah, you're right, the 128 bit xorshift* is what I was thinking of.