#include <stdio.h>

#define NR 100000000

#define LOOP(x) for(int i = 0; i < NR/16; i++) do { \
	asm volatile(x); sum += base; \
	asm volatile(x); sum += base; \
	asm volatile(x); sum += base; \
	asm volatile(x); sum += base; \
	asm volatile(x); sum += base; \
	asm volatile(x); sum += base; \
	asm volatile(x); sum += base; \
	asm volatile(x); sum += base; \
	asm volatile(x); sum += base; \
	asm volatile(x); sum += base; \
	asm volatile(x); sum += base; \
	asm volatile(x); sum += base; \
	asm volatile(x); sum += base; \
	asm volatile(x); sum += base; \
	asm volatile(x); sum += base; \
	asm volatile(x); sum += base; \
} while (0)

static inline unsigned int rdtsc(void)
{
	unsigned int a,d;
	asm volatile("rdtsc":"=a"(a),"=d"(d)::"memory");
	return a;
}

#define TEST(x) do { \
	unsigned int s = rdtsc(); \
	LOOP(x); \
	s = rdtsc()-s; \
	fprintf(stderr, "  " #x "=%ul: %f\n", sum, s / (double)NR); \
} while (0)

int main(int argc, char **argv)
{
	unsigned long base = 0, sum = 0;
	unsigned long zero = 0;

	TEST("nop");
	TEST("nop");
	TEST("nop");
	TEST("mov %1,%0":"=r"(base):"m"(zero));
	TEST("rdgsbase %0":"=r"(base));
	return 0;
}