2.1.1 XORShift64Seed

Parent: 2.1 SeedLib: seed generators · Guide map

This is ModuloRandom's default seed generator. Choose the standard xorshift64 option, the Xorshift64_star option, or custom shift counts. A zero initial state is replaced internally with a nonzero state, while init still reports the supplied zero.

The xorshift family comes from George Marsaglia’s “Xorshift RNGs” (2003). The Xorshift64_star option matches the right, left, right shifts (12, 25, 27) in Figure 10 of Sebastiano Vigna’s paper on scrambled xorshift generators. ModuloRandom supplies the paper’s multiplier for its XORShift64_Star option, scrambling output without changing the seed generator’s state. See research and provenance. The paper tests the raw generator, not RandEXom’s bounded-number or byte APIs.

using RandEXom.SeedLib;
using RandEXom.RandomLib;

var seed = new XORShift64Seed(XORShift64Seed.Type.Xorshift64_star, seed: 42);
var random = new ModuloRandom(seed, ModuloRandom.Multiplier.XORShift64_Star);

Custom shifts use new XORShift64Seed(shift1, shift2, shift3, seed: 42); each shift must be from 1 through 63. Custom parameters are not automatically vetted for statistical quality.

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