gcc/testsuite/gcc.c-torture/execute/ieee/fp-cmp-2.c

   1 #ifndef SIGNAL_SUPPRESS
   2 #include <signal.h>
   3 #endif
   4
   5 void abort (void);
   6 void exit (int);
   7
   8 float fnan = 1.0f/0.0f - 1.0f/0.0f;
   9 float x = 1.0f;
  10
  11 void leave ()
  12 {
  13   exit (0);
  14 }
  15
  16 int
  17 main (void)
  18 {
  19 #if ! defined (__vax__) && ! defined (_CRAY)
  20   /* Move this line earlier, for architectures (like alpha) that issue
  21      SIGFPE on the first comparisons. */
  22 #ifndef SIGNAL_SUPPRESS
  23   /* Some machines catches a SIGFPE when a NaN is compared.
  24      Let this test succeed o such machines.  */
  25   signal (SIGFPE, leave);
  26 #endif
  27   /* NaN is an IEEE unordered operand.  All these test should be false.  */
  28   if (fnan == fnan)
  29     abort ();
  30   if (fnan != x)
  31     x = 1.0;
  32   else
  33     abort ();
  34
  35   if (fnan < x)
  36     abort ();
  37   if (fnan > x)
  38     abort ();
  39   if (fnan <= x)
  40     abort ();
  41   if (fnan >= x)
  42     abort ();
  43   if (fnan == x)
  44     abort ();
  45 #endif
  46   exit (0);
  47 }