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26 lines
936 B
C++
26 lines
936 B
C++
#pragma once
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/* Written in 2015 by Sebastiano Vigna (vigna@acm.org)
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To the extent possible under law, the author has dedicated all copyright
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and related and neighboring rights to this software to the public domain
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worldwide. This software is distributed without any warranty.
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See <http://creativecommons.org/publicdomain/zero/1.0/>. */
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#include <stdint.h>
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/* This is a fixed-increment version of Java 8's SplittableRandom generator
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See http://dx.doi.org/10.1145/2714064.2660195 and
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http://docs.oracle.com/javase/8/docs/api/java/util/SplittableRandom.html
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It is a very fast generator passing BigCrush, and it can be useful if
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for some reason you absolutely want 64 bits of state. */
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__attribute__((no_sanitize("integer")))
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inline uint64_t splitmix64(uint64_t& x) {
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uint64_t z = (x += 0x9e3779b97f4a7c15);
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z = (z ^ (z >> 30)) * 0xbf58476d1ce4e5b9;
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z = (z ^ (z >> 27)) * 0x94d049bb133111eb;
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return z ^ (z >> 31);
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} |