old-autovect-branch/gcc/testsuite/gcc.c-torture/execute/ieee/mzero5.c

   1 /* Test gcse handling of IEEE 0/-0 rules.  */
   2 static double zero = 0.0;
   3
   4 int
   5 negzero_check (double d)
   6 {
   7   if (d == 0)
   8     return !!memcmp ((void *)&zero, (void *)&d, sizeof (double));
   9   return 0;
  10 }
  11
  12 int
  13 sub (double d, double e)
  14 {
  15   if (d == 0.0 && e == 0.0
  16       && negzero_check (d) == 0 && negzero_check (e) == 0)
  17     return 1;
  18   else
  19     return 0;
  20 }
  21
  22 int
  23 main (void)
  24 {
  25   double minus_zero = -0.0;
  26   if (sub (minus_zero, 0))
  27     abort ();
  28   return 0;
  29 }