#include <stdio.h>
#include <time.h>

#include "xorshift.h"

struct timespec clock_diff(struct timespec start, struct timespec stop)
{
	struct timespec diff;
	if ((stop.tv_nsec-start.tv_nsec) < 0) {

		diff.tv_sec  = stop.tv_sec - start.tv_sec - 1;
		diff.tv_nsec = 1e9 + stop.tv_nsec - start.tv_nsec;

	} else {

		diff.tv_sec  = stop.tv_sec  - start.tv_sec;
		diff.tv_nsec = stop.tv_nsec - start.tv_nsec;
	}

	return diff;
}


#define BENCHMARK(func)												\
{																	\
	struct timespec start, stop, diff;								\
																	\
	clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &start);				\
																	\
	for (size_t i = 0; i < 1e9; ++i)								\
		(void)func();												\
																	\
	clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &stop);					\
	diff = clock_diff(start, stop);									\
																	\
	printf("%ld:%ld\n", (long)diff.tv_sec, (long)diff.tv_nsec);		\
}																	\


int main()
{
	BENCHMARK(xorshift128);
	BENCHMARK(xorshift128plus);

	return 0;
}