gcc/testsuite/gcc.target/i386/980211-1.c

   1 /* Test long double on x86 and x86-64. */
   2
   3 /* { dg-do run } */
   4 /* { dg-options -O2 } */
   5
   6 extern void abort (void);
   7
   8 __inline int
   9 __signbitl0 (long double __x)
  10 {
  11   union { long double __l; int __i[3]; } __u = { __l: __x };
  12
  13   return (__u.__i[2] & 0x8000) != 0;
  14 }
  15
  16 void
  17 foo (long double x, long double y)
  18 {
  19   long double z = x / y;
  20   if (__signbitl0 (x) && __signbitl0 (z))
  21     abort ();
  22 }
  23
  24 int main()
  25 {
  26   if (sizeof (long double) > sizeof (double))
  27     foo (-0.0, -1.0);
  28   return 0;
  29 }