tavi-cacina / Xoshiro256ss

A minimal xoshiro256** generator with the C++ <random> interface

A minimal xoshiro256** generator, with the C++ interface.

Generate 64-bit random integers, speedily, with code small enough to paste directly into your project.

By Arthur O'Dwyer, based on code by David Blackman and Sebastiano Vigna. All errors are my own. Public domain.

• https://prng.di.unimi.it/xoshiro256starstar.c

• https://prng.di.unimi.it/splitmix64.c

Test vectors

Initialize xoshiro256** with the SplitMix64 of seed 100, then generate four 64-bit results; they should be

792317387143481937
1418856489092323125
6662743737787356053
9823178768685107703

or, in hex,

0afee077'3a0d8a51
13b0ca75'9b9b1735
5c76d220'f8461395
8852f10b'70a289f7

In this repository, test-vector.cpp uses this C++ xoshiro256ss.h implementation; test-vector.c uses Blackman and Vigna's C code; and test-vector.py uses the implementation from the Python randomgen package. All three produce the expected output on my machine.