1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
|
/*
* A fast portable random number generator.
*
* Adapted version of splitmix64.c originally published by Sebastiano
* Vigna to the public domain.
* http://xoroshiro.di.unimi.it/splitmix64.c
*/
#ifndef __SPLITMIX64_H
#define __SPLITMIX64_H
#include <stdint.h>
static uint64_t x; /* The state can be seeded with any value. */
static void srand_splitmix64(uint64_t seed) {
x = seed;
}
static uint64_t rand_splitmix64() {
uint64_t z = (x += 0x9e3779b97f4a7c15);
z = (z ^ (z >> 30)) * 0xbf58476d1ce4e5b9;
z = (z ^ (z >> 27)) * 0x94d049bb133111eb;
return z ^ (z >> 31);
}
#endif // __SPLITMIX64_H
|
