bogomips

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

static void delay(int loops)
{
  long i;
  for (i = loops; i >= 0 ; i--)
    ;
}

int main(void)
{
  unsigned long loops_per_sec = 1;
  unsigned long ticks;

  printf("Calibrating delay loop.. ");
  fflush(stdout);

  while ((loops_per_sec <<= 1)) {
    ticks = clock();
    delay(loops_per_sec);
    ticks = clock() - ticks;
    if (ticks >= CLOCKS_PER_SEC) {
      loops_per_sec = (loops_per_sec / ticks) * CLOCKS_PER_SEC;
      printf("ok - %lu.%02lu BogoMips\n",
         loops_per_sec/500000,
         (loops_per_sec/5000) % 100
         );
      return 0;
    }
  }
  printf("failed\n");
  return -1;
}