138 lines
3.4 KiB
C
138 lines
3.4 KiB
C
#ifndef FIO_RAND_H
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#define FIO_RAND_H
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#include <inttypes.h>
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#include <assert.h>
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#include "types.h"
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#include "../arch/arch.h"
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#define FRAND32_MAX (-1U)
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#define FRAND64_MAX (-1ULL)
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struct taus88_state {
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unsigned int s1, s2, s3;
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};
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struct taus258_state {
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uint64_t s1, s2, s3, s4, s5;
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};
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struct frand_state {
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unsigned int use64;
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union {
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struct taus88_state state32;
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struct taus258_state state64;
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};
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};
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static inline uint64_t rand_max(struct frand_state *state)
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{
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if (state->use64)
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return FRAND64_MAX;
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else
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return FRAND32_MAX;
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}
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static inline void __frand32_copy(struct taus88_state *dst,
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struct taus88_state *src)
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{
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dst->s1 = src->s1;
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dst->s2 = src->s2;
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dst->s3 = src->s3;
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}
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static inline void __frand64_copy(struct taus258_state *dst,
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struct taus258_state *src)
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{
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dst->s1 = src->s1;
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dst->s2 = src->s2;
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dst->s3 = src->s3;
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dst->s4 = src->s4;
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dst->s5 = src->s5;
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}
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static inline void frand_copy(struct frand_state *dst, struct frand_state *src)
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{
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if (src->use64)
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__frand64_copy(&dst->state64, &src->state64);
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else
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__frand32_copy(&dst->state32, &src->state32);
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dst->use64 = src->use64;
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}
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static inline unsigned int __rand32(struct taus88_state *state)
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{
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#define TAUSWORTHE(s,a,b,c,d) ((s&c)<<d) ^ (((s <<a) ^ s)>>b)
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state->s1 = TAUSWORTHE(state->s1, 13, 19, 4294967294UL, 12);
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state->s2 = TAUSWORTHE(state->s2, 2, 25, 4294967288UL, 4);
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state->s3 = TAUSWORTHE(state->s3, 3, 11, 4294967280UL, 17);
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return (state->s1 ^ state->s2 ^ state->s3);
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}
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static inline uint64_t __rand64(struct taus258_state *state)
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{
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uint64_t xval;
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xval = ((state->s1 << 1) ^ state->s1) >> 53;
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state->s1 = ((state->s1 & 18446744073709551614ULL) << 10) ^ xval;
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xval = ((state->s2 << 24) ^ state->s2) >> 50;
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state->s2 = ((state->s2 & 18446744073709551104ULL) << 5) ^ xval;
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xval = ((state->s3 << 3) ^ state->s3) >> 23;
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state->s3 = ((state->s3 & 18446744073709547520ULL) << 29) ^ xval;
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xval = ((state->s4 << 5) ^ state->s4) >> 24;
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state->s4 = ((state->s4 & 18446744073709420544ULL) << 23) ^ xval;
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xval = ((state->s5 << 3) ^ state->s5) >> 33;
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state->s5 = ((state->s5 & 18446744073701163008ULL) << 8) ^ xval;
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return (state->s1 ^ state->s2 ^ state->s3 ^ state->s4 ^ state->s5);
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}
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static inline uint64_t __rand(struct frand_state *state)
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{
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if (state->use64)
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return __rand64(&state->state64);
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else
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return __rand32(&state->state32);
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}
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static inline double __rand_0_1(struct frand_state *state)
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{
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if (state->use64) {
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uint64_t val = __rand64(&state->state64);
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return (val + 1.0) / (FRAND64_MAX + 1.0);
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} else {
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uint32_t val = __rand32(&state->state32);
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return (val + 1.0) / (FRAND32_MAX + 1.0);
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}
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}
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/*
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* Generate a random value between 'start' and 'end', both inclusive
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*/
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static inline int rand32_between(struct frand_state *state, int start, int end)
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{
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uint32_t r;
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assert(!state->use64);
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r = __rand32(&state->state32);
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return start + (int) ((double)end * (r / (FRAND32_MAX + 1.0)));
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}
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extern void init_rand(struct frand_state *, bool);
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extern void init_rand_seed(struct frand_state *, unsigned int seed, bool);
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extern void __fill_random_buf(void *buf, unsigned int len, unsigned long seed);
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extern unsigned long fill_random_buf(struct frand_state *, void *buf, unsigned int len);
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extern void __fill_random_buf_percentage(unsigned long, void *, unsigned int, unsigned int, unsigned int, char *, unsigned int);
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extern unsigned long fill_random_buf_percentage(struct frand_state *, void *, unsigned int, unsigned int, unsigned int, char *, unsigned int);
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#endif
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