#include <stdint.h>
+/**
+ * Context structure for the Lagged Fibonacci PRNG.
+ * The exact layout, types and content of this struct may change and should
+ * not be accessed directly. Only its sizeof() is guranteed to stay the same
+ * to allow easy instanciation.
+ */
typedef struct AVLFG {
unsigned int state[64];
int index;
* it may be good enough and faster for your specific use case.
*/
static inline unsigned int av_lfg_get(AVLFG *c){
- c->state[c->index & 63] = c->state[(c->index-24) & 63] + c->state[(c->index-55) & 63];
- return c->state[c->index++ & 63];
+ unsigned a = c->state[c->index & 63] = c->state[(c->index-24) & 63] + c->state[(c->index-55) & 63];
+ c->index += 1U;
+ return a;
}
/**
static inline unsigned int av_mlfg_get(AVLFG *c){
unsigned int a= c->state[(c->index-55) & 63];
unsigned int b= c->state[(c->index-24) & 63];
- return c->state[c->index++ & 63] = 2*a*b+a+b;
+ a = c->state[c->index & 63] = 2*a*b+a+b;
+ c->index += 1U;
+ return a;
}
/**