DualMix128 – A fast, simple PRNG passing PractRand (32TB) and BigCrush

What it does

Fast 128-bit PRNGs (DualMix128A/B) with strong statistical test results - the-othernet/DualMix128

DualMix128 has been replaced by LoopMix128 (a PRNG with similar benchmarks, proven injectivity and a guaranteed 2^128 period) : https://github.com/danielcota/LoopMix128 This repository contains DualMix128 , a simple and extremely fast pseudo-random number generator (PRNG) with 128 bits of state. It is designed for non-cryptographic applications where speed and statistical quality are important. // Golden ratio fractional part * 2^64 const uint64_t GR = 0x9e3779b97f4a7c15ULL; // Initialized to non-zero with SplitMix64 (or equivalent) uint64_t state0, state1; // Helper for rotation static inline uint64_t rotateLeft(const uint64_t x, int k) { return (x << k) | (x >> (64 - k)); } // ---…from github.com

In the maker’s words, at launch

Hi HN, I'd like to share DualMix128, a pseudo-random number generator I developed. It's written in C and achieves very high speed while maintaining strong statistical properties for non-cryptographic use. GitHub (MIT License): https:&#x2F;&#x2F;github.com&#x2F;the-othernet&#x2F;DualMix128 Key points: * *Fast:*…

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  LoopMix128 – Fast C PRNG (.46ns), 2^128 Period, BigCrush/PractRand Pass2025 · github.com · ▲76

  LoopMix128 is a fast C PRNG I wrote for non-cryptographic tasks. GitHub (MIT): https:&#x2F;&#x2F;github.com&#x2F;danielcota&#x2F;LoopMix128 Highlights: * ~0.37 ns&#x2F;value (GCC 11.4, -O3 -march=native), 98% faster than xoroshiro128++ and PCG64. * Passes TestU01 BigCrush & PractRand (32TB). * Guaranteed 2^128 period. * Proven injective (192-bit state) via Z3 SMT solver; allows parallel streams. * Core requires only stdint.h. Seeking feedback on design, use cases, or further testing.

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