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xorshift.hh
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/
xorshift.hh
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/*
Class of pseudorandom number generators, discovered by George Marsaglia
Copyright 2018 Ahmet Inan <inan@aicodix.de>
*/
#pragma once
namespace CODE {
class Xorshift32
{
static const uint32_t Y = 2463534242;
uint32_t y_;
public:
typedef uint32_t result_type;
static constexpr result_type min()
{
return 0;
}
static constexpr result_type max()
{
return UINT32_MAX;
}
Xorshift32(uint32_t y = Y) : y_(y) {}
void reset(uint32_t y = Y)
{
y_ = y;
}
uint32_t operator()()
{
y_ ^= y_ << 13;
y_ ^= y_ >> 17;
y_ ^= y_ << 5;
return y_;
}
};
class Xorshift64
{
static const uint64_t X = 88172645463325252;
uint64_t x_;
public:
typedef uint64_t result_type;
static constexpr result_type min()
{
return 0;
}
static constexpr result_type max()
{
return UINT64_MAX;
}
Xorshift64(uint64_t x = X) : x_(x) {}
void reset(uint64_t x = X)
{
x_ = x;
}
uint64_t operator()()
{
x_ ^= x_ << 13;
x_ ^= x_ >> 7;
x_ ^= x_ << 17;
return x_;
}
};
class Xorwow
{
static const uint32_t X = 123456789;
static const uint32_t Y = 362436069;
static const uint32_t Z = 521288629;
static const uint32_t W = 88675123;
static const uint32_t V = 5783321;
static const uint32_t D = 6615241;
uint32_t x_, y_, z_, w_, v_, d_;
public:
typedef uint32_t result_type;
static constexpr result_type min()
{
return 0;
}
static constexpr result_type max()
{
return UINT32_MAX;
}
Xorwow(uint32_t x = X, uint32_t y = Y,
uint32_t z = Z, uint32_t w = W,
uint32_t v = V, uint32_t d = D) :
x_(x), y_(y), z_(z), w_(w), v_(v), d_(d) {}
void reset(uint32_t x = X, uint32_t y = Y,
uint32_t z = Z, uint32_t w = W,
uint32_t v = V, uint32_t d = D)
{
x_ = x;
y_ = y;
z_ = z;
w_ = w;
v_ = v;
d_ = d;
}
uint32_t operator()()
{
uint32_t t = x_ ^ (x_ >> 2);
x_ = y_; y_ = z_; z_ = w_; w_ = v_;
v_ = (v_ ^ (v_ << 4)) ^ (t ^ (t << 1));
d_ += 362437;
return d_ + v_;
}
};
class Xorshift128
{
static const uint32_t X = 123456789;
static const uint32_t Y = 362436069;
static const uint32_t Z = 521288629;
static const uint32_t W = 88675123;
uint32_t x_, y_, z_, w_;
public:
typedef uint32_t result_type;
static constexpr result_type min()
{
return 0;
}
static constexpr result_type max()
{
return UINT32_MAX;
}
Xorshift128(uint32_t x = X, uint32_t y = Y,
uint32_t z = Z, uint32_t w = W) :
x_(x), y_(y), z_(z), w_(w) {}
void reset(uint32_t x = X, uint32_t y = Y,
uint32_t z = Z, uint32_t w = W)
{
x_ = x;
y_ = y;
z_ = z;
w_ = w;
}
uint32_t operator()()
{
uint32_t t = (x_ ^ (x_ << 11));
x_ = y_; y_ = z_; z_ = w_;
w_ = (w_ ^ (w_ >> 19)) ^ (t ^ (t >> 8));
return w_;
}
};
}