cmpsi-1.c

this is a gcc file, you can download it and learn its usetility, for further detail please look at t

f1 (unsigned int x, unsigned int y)
{
  if (x == 0)
    dummy ();
  x -= y;
  /* 0xfffffff2 < 0x80000000? */
  if (x < ~(~(unsigned int) 0 >> 1))
    abort ();
  return x;
}

f2 (unsigned long int x, unsigned long int y)
{
  if (x == 0)
    dummy ();
  x -= y;
  /* 0xfffffff2 < 0x80000000? */
  if (x < ~(~(unsigned long int) 0 >> 1))
    abort ();
  return x;
}


dummy () {}

main ()
{
  /*      0x7ffffff3			0x80000001 */
  f1 ((~(unsigned int) 0 >> 1) - 12, ~(~(unsigned int) 0 >> 1) + 1);
  f2 ((~(unsigned long int) 0 >> 1) - 12, ~(~(unsigned long int) 0 >> 1) + 1);
  exit (0);
}