#include <stdio.h>
#include <stdlib.h>

#define SIZE 1000
int a[SIZE];
int c;

int funcao (void) {
  int sum, i;

  for (i=0 ; i<SIZE ; i++) 
    sum +=a[i];

  return (sum);
}

main () {
  int i, res;
  double CPE;

  for (i=0 ; i<SIZE ; i++)
    a[i] = (int) (100.0 * rand() / (RAND_MAX+1.0));

  asm ("rdtsc; movl %%eax, %0"
       : "=r" (c)      /* Output */
       :               /* no inputs */
       : "%eax", "%edx"  /* used registers */
  );
  
  res = funcao ();

  asm ("rdtsc; subl %1, %%eax ; movl %%eax, %0"
       : "=r" (c)      /* Output */
       : "r"  (c)      /* Inputs */
       : "%eax", "%edx"  /* used registers */
  );
  
  CPE = ((double) c)/SIZE;
  printf ("Ciclos = %d; CPE = %.0lf\n", c, CPE);
  printf ("That's all, folks!\n");
}