hash/splitmix64.hpp

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• Last update: 2025-01-27 19:15:20+09:00
• Include: #include "hash/splitmix64.hpp"
• Link: http://xorshift.di.unimi.it/splitmix64.c

Required by

• number/pollard_rho.hpp
• number/primitive_root.hpp

Verified with

• test/lc_factorize.cpp
• test/lc_primitive_root.cpp

Code

constexpr uint64_t splitmix64(uint64_t x) {
    // http://xorshift.di.unimi.it/splitmix64.c
    x += 0x9e3779b97f4a7c15;
    x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
    x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
    return x ^ (x >> 31);
}

#line 1 "hash/splitmix64.hpp"
constexpr uint64_t splitmix64(uint64_t x) {
    // http://xorshift.di.unimi.it/splitmix64.c
    x += 0x9e3779b97f4a7c15;
    x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
    x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
    return x ^ (x >> 31);
}

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