1  /* Test NAN macro.  Runtime exceptions test, to verify NaN is quiet
       2     not signaling.  */
       3  /* { dg-do run } */
       4  /* { dg-require-effective-target fenv_exceptions } */
       5  /* { dg-options "-std=c2x -pedantic-errors" } */
       6  /* { dg-add-options ieee } */
       7  
       8  #include <fenv.h>
       9  #include <float.h>
      10  
      11  /* This should be defined if and only if quiet NaNs are supported for
      12     type float.  If the testsuite gains effective-target support for
      13     targets not supporting NaNs, or not supporting them for all types,
      14     this test should only be run for targets supporting quiet NaNs for
      15     float.  */
      16  #ifndef NAN
      17  #error "NAN undefined"
      18  #endif
      19  
      20  volatile float f = NAN;
      21  
      22  extern void abort (void);
      23  extern void exit (int);
      24  
      25  int
      26  main (void)
      27  {
      28    f += f;
      29    if (fetestexcept (FE_INVALID))
      30      abort ();
      31    exit (0);
      32  }