rand: use bools

[fio.git] / lib / rand.c

diff --git a/lib/rand.c b/lib/rand.c
index cecc4c21ea90a28775f6e187a24c52429ab4f2f5..9c3e0d6a39e181149ad04ac5c36f7220d115de95 100644 (file)
--- a/lib/rand.c
+++ b/lib/rand.c
@@ -33,27 +33,167 @@
 
 */
 
+#include <string.h>
+#include <assert.h>
 #include "rand.h"
+#include "lib/pattern.h"
+#include "../hash.h"
 
-struct frand_state __fio_rand_state;
+int arch_random;
 
-static inline int __seed(unsigned int x, unsigned int m)
+static inline uint64_t __seed(uint64_t x, uint64_t m)
 {
        return (x < m) ? x + m : x;
 }
 
-void init_rand(struct frand_state *state)
+static void __init_rand32(struct taus88_state *state, unsigned int seed)
 {
-#define LCG(x)  ((x) * 69069)   /* super-duper LCG */
+       int cranks = 6;
 
-       state->s1 = __seed(LCG((2^31) + (2^17) + (2^7)), 1);
-       state->s2 = __seed(LCG(state->s1), 7);
-       state->s3 = __seed(LCG(state->s2), 15);
+#define LCG(x, seed)  ((x) * 69069 ^ (seed))
 
-       __rand(state);
-       __rand(state);
-       __rand(state);
-       __rand(state);
-       __rand(state);
-       __rand(state);
+       state->s1 = __seed(LCG((2^31) + (2^17) + (2^7), seed), 1);
+       state->s2 = __seed(LCG(state->s1, seed), 7);
+       state->s3 = __seed(LCG(state->s2, seed), 15);
+
+       while (cranks--)
+               __rand32(state);
+}
+
+static void __init_rand64(struct taus258_state *state, uint64_t seed)
+{
+       int cranks = 6;
+
+#define LCG64(x, seed)  ((x) * 6906969069ULL ^ (seed))
+
+       state->s1 = __seed(LCG64((2^31) + (2^17) + (2^7), seed), 1);
+       state->s2 = __seed(LCG64(state->s1, seed), 7);
+       state->s3 = __seed(LCG64(state->s2, seed), 15);
+       state->s4 = __seed(LCG64(state->s3, seed), 33);
+       state->s5 = __seed(LCG64(state->s4, seed), 49);
+
+       while (cranks--)
+               __rand64(state);
+}
+
+void init_rand(struct frand_state *state, bool use64)
+{
+       state->use64 = use64;
+
+       if (!use64)
+               __init_rand32(&state->state32, 1);
+       else
+               __init_rand64(&state->state64, 1);
+}
+
+void init_rand_seed(struct frand_state *state, unsigned int seed, bool use64)
+{
+       state->use64 = use64;
+
+       if (!use64)
+               __init_rand32(&state->state32, seed);
+       else
+               __init_rand64(&state->state64, seed);
+}
+
+void __fill_random_buf(void *buf, unsigned int len, unsigned long seed)
+{
+       void *ptr = buf;
+
+       while (len) {
+               int this_len;
+
+               if (len >= sizeof(int64_t)) {
+                       *((int64_t *) ptr) = seed;
+                       this_len = sizeof(int64_t);
+               } else if (len >= sizeof(int32_t)) {
+                       *((int32_t *) ptr) = seed;
+                       this_len = sizeof(int32_t);
+               } else if (len >= sizeof(int16_t)) {
+                       *((int16_t *) ptr) = seed;
+                       this_len = sizeof(int16_t);
+               } else {
+                       *((int8_t *) ptr) = seed;
+                       this_len = sizeof(int8_t);
+               }
+               ptr += this_len;
+               len -= this_len;
+               seed *= GOLDEN_RATIO_PRIME;
+               seed >>= 3;
+       }
+}
+
+unsigned long fill_random_buf(struct frand_state *fs, void *buf,
+                             unsigned int len)
+{
+       unsigned long r = __rand(fs);
+
+       if (sizeof(int) != sizeof(long *))
+               r *= (unsigned long) __rand(fs);
+
+       __fill_random_buf(buf, len, r);
+       return r;
+}
+
+void __fill_random_buf_percentage(unsigned long seed, void *buf,
+                                 unsigned int percentage,
+                                 unsigned int segment, unsigned int len,
+                                 char *pattern, unsigned int pbytes)
+{
+       unsigned int this_len;
+
+       if (percentage == 100) {
+               if (pbytes)
+                       (void)cpy_pattern(pattern, pbytes, buf, len);
+               else
+                       memset(buf, 0, len);
+               return;
+       }
+
+       if (segment > len)
+               segment = len;
+
+       while (len) {
+               /*
+                * Fill random chunk
+                */
+               this_len = (segment * (100 - percentage)) / 100;
+               if (this_len > len)
+                       this_len = len;
+
+               __fill_random_buf(buf, this_len, seed);
+
+               len -= this_len;
+               if (!len)
+                       break;
+               buf += this_len;
+
+               if (this_len > len)
+                       this_len = len;
+               else if (len - this_len <= sizeof(long))
+                       this_len = len;
+
+               if (pbytes)
+                       (void)cpy_pattern(pattern, pbytes, buf, this_len);
+               else
+                       memset(buf, 0, this_len);
+
+               len -= this_len;
+               buf += this_len;
+       }
+}
+
+unsigned long fill_random_buf_percentage(struct frand_state *fs, void *buf,
+                                        unsigned int percentage,
+                                        unsigned int segment, unsigned int len,
+                                        char *pattern, unsigned int pbytes)
+{
+       unsigned long r = __rand(fs);
+
+       if (sizeof(int) != sizeof(long *))
+               r *= (unsigned long) __rand(fs);
+
+       __fill_random_buf_percentage(r, buf, percentage, segment, len,
+                                       pattern, pbytes);
+       return r;
 }