mingw-w64-crt/testcases/t_speed_powl.c

#include <windows.h>
#include <stdio.h>
#include <math.h>

int main()
{
  DWORD start_ticks,synch_ticks;
  int i;
  long double ld, sum;
  sum = 0.0L;
  ld = 1.0L;
  start_ticks = synch_ticks = GetTickCount();
  while (start_ticks == synch_ticks)
	start_ticks = GetTickCount ();
  for (i = 0;i < 0x3fffff * 19 ; i++) { sum += powl (ld, 0.5L); ld+=0.03; }
  start_ticks = GetTickCount() - start_ticks;
  __mingw_printf ("Loop %d times with result %Lg\n", i, ld);
  printf ("Has %g calculations / ms\n", (double) i / (double) start_ticks);
  return 0;
}