PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
typedef struct random_t {
- /* Random number generators */
- int32_t galois_LFSR; /* Galois LFSR (fast but weak). signed! */
- uint32_t LCG; /* LCG (fast but weak) */
+ /* State of random number generators: */
+
+ /* Galois LFSR (fast but weak) */
+ int32_t galois_LFSR; /* must be signed! */
+
+ /* LCG (fast but weak) */
+ uint32_t LCG;
+
+ /* 64-bit xorshift (fast, moderate strength) */
+ uint32_t xs64_x;
+ uint32_t xs64_y;
} random_t;
#define UNINITED_RANDOM_T(rnd) \
((rnd)->galois_LFSR == 0)
#define INIT_RANDOM_T(rnd, nonzero, v) \
- ((rnd)->galois_LFSR = (nonzero), (rnd)->LCG = (v))
+ ((rnd)->galois_LFSR = (rnd)->xs64_x = (nonzero), (rnd)->LCG = (rnd)->xs64_y = (v))
#define CLEAR_RANDOM_T(rnd) \
((rnd)->galois_LFSR = 0)