old-autovect-branch/gcc/testsuite/gcc.c-torture/execute/ieee/mzero6.c

   1 /* Tail call optimizations would convert func() into the moral equivalent of:
   2
   3        double acc = 0.0;
   4        for (int i = 0; i <= n; i++)
   5          acc += d;
   6        return acc;
   7
   8    which mishandles the case where 'd' is -0.  They also initialised 'acc'
   9    to a zero int rather than a zero double.  */
  10
  11 double func (double d, int n)
  12 {
  13   if (n == 0)
  14     return d;
  15   else
  16     return d + func (d, n - 1);
  17 }
  18
  19 int main ()
  20 {
  21   if (__builtin_copysign (1.0, func (0.0 / -5.0, 10)) != -1.0)
  22     abort ();
  23   exit (0);
  24 }