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1 | #ifndef FIO_RAND_H |
2 | #define FIO_RAND_H | |
3 | ||
2615cc4b JA |
4 | #define FRAND_MAX (-1U) |
5 | ||
1fbbf72e JA |
6 | struct frand_state { |
7 | unsigned int s1, s2, s3; | |
8 | }; | |
9 | ||
1fbbf72e JA |
10 | static inline unsigned int __rand(struct frand_state *state) |
11 | { | |
12 | #define TAUSWORTHE(s,a,b,c,d) ((s&c)<<d) ^ (((s <<a) ^ s)>>b) | |
13 | ||
14 | state->s1 = TAUSWORTHE(state->s1, 13, 19, 4294967294UL, 12); | |
15 | state->s2 = TAUSWORTHE(state->s2, 2, 25, 4294967288UL, 4); | |
16 | state->s3 = TAUSWORTHE(state->s3, 3, 11, 4294967280UL, 17); | |
17 | ||
18 | return (state->s1 ^ state->s2 ^ state->s3); | |
19 | } | |
20 | ||
21 | extern void init_rand(struct frand_state *); | |
2615cc4b | 22 | extern void init_rand_seed(struct frand_state *, unsigned int seed); |
7d9fb455 | 23 | extern void __fill_random_buf(void *buf, unsigned int len, unsigned long seed); |
3545a109 | 24 | extern unsigned long fill_random_buf(struct frand_state *, void *buf, unsigned int len); |
1fbbf72e JA |
25 | |
26 | #endif |