1  /* Test IEEE +0/-0 rules */
       2  
       3  static double pzero = +0.0;
       4  static double nzero = -0.0;
       5  static double pinf  = +1.0 / 0.0;
       6  static double ninf  = -1.0 / 0.0;
       7  static double nan   =  0.0 / 0.0;
       8  
       9  void
      10  expect (double value, double expected)
      11  {
      12    if (expected != expected)	/* expected value is Not a number */
      13      {
      14        if (value == value)	/* actual value is a number */
      15  	abort ();
      16      }
      17  
      18    else if (value != value)
      19      abort ();			/* actual value is a NaN */
      20  
      21    else if (memcmp ((void *)&value, (void *)&expected, sizeof (double)) != 0)
      22      abort ();			/* values don't match */
      23  }
      24  
      25  main ()
      26  {
      27    expect (pzero + pzero, pzero);
      28    expect (pzero + nzero, pzero);
      29    expect (nzero + pzero, pzero);
      30    expect (nzero + nzero, nzero);
      31  
      32    expect (pzero - pzero, pzero);
      33    expect (pzero - nzero, pzero);
      34    expect (nzero - pzero, nzero);
      35    expect (nzero - nzero, pzero);
      36  
      37    expect (pzero * pzero, pzero);
      38    expect (pzero * nzero, nzero);
      39    expect (nzero * pzero, nzero);
      40    expect (nzero * nzero, pzero);
      41  
      42    expect (+1.00 * pzero, pzero);
      43    expect (-1.00 * pzero, nzero);
      44    expect (+1.00 * nzero, nzero);
      45    expect (-1.00 * nzero, pzero);
      46  
      47  #ifndef _TMS320C6700
      48    /* C6X floating point division is implemented using reciprocals.  */
      49    expect (pzero / pzero, nan);
      50    expect (pzero / nzero, nan);
      51    expect (nzero / pzero, nan);
      52    expect (nzero / nzero, nan);
      53  
      54    expect (+1.00 / pzero, pinf);
      55    expect (-1.00 / pzero, ninf);
      56    expect (+1.00 / nzero, ninf);
      57    expect (-1.00 / nzero, pinf);
      58  #endif
      59  
      60    exit (0);
      61  }