1 #include "igt_rand.h"
2 
3 /**
4  * SECTION:igt_rand
5  * @short_description: Random numbers helper library
6  * @title: Random
7  * @include: igt_rand.h
8  */
9 
10 static uint32_t global = 0x12345678;
11 
hars_petruska_f54_1_random_seed(uint32_t new_state)12 uint32_t hars_petruska_f54_1_random_seed(uint32_t new_state)
13 {
14 	uint32_t old_state = global;
15 	global = new_state;
16 	return old_state;
17 }
18 
hars_petruska_f54_1_random(uint32_t * s)19 uint32_t hars_petruska_f54_1_random(uint32_t *s)
20 {
21 #define rol(x,k) ((x << k) | (x >> (32-k)))
22 	return *s = (*s ^ rol(*s, 5) ^ rol(*s, 24)) + 0x37798849;
23 #undef rol
24 }
25 
hars_petruska_f54_1_random_unsafe(void)26 uint32_t hars_petruska_f54_1_random_unsafe(void)
27 {
28 	return hars_petruska_f54_1_random(&global);
29 }
30