gcc/testsuite/gcc.dg/fnegate-1.c

   1 /* Copyright (C) 2002 Free Software Foundation.
   2
   3    Test floating point negation produces the expected results.
   4
   5    Written by Roger Sayle, 21st May 2002.  */
   6
   7 /* { dg-do run } */
   8 /* { dg-options "-O2 -ffast-math" } */
   9
  10 extern void abort ();
  11
  12
  13 double
  14 dneg (double x)
  15 {
  16   return -x;
  17 }
  18
  19 double
  20 dmult (double x)
  21 {
  22   return -1.0 * x;
  23 }
  24
  25 double
  26 ddiv (double x)
  27 {
  28   return x / -1.0;
  29 }
  30
  31
  32 float
  33 fneg (float x)
  34 {
  35   return -x;
  36 }
  37
  38 float
  39 fmult (float x)
  40 {
  41   return -1.0f * x;
  42 }
  43
  44 float
  45 fdiv (float x)
  46 {
  47   return x / -1.0f;
  48 }
  49
  50
  51 void
  52 ftest(float src, float dst)
  53 {
  54   if (fneg (src) != dst)
  55     abort ();
  56
  57   if (src != fneg (dst))
  58     abort ();
  59
  60   if (fmult (src) != dst)
  61     abort ();
  62
  63   if (src != fmult (dst))
  64     abort ();
  65
  66   if (fdiv (src) != dst)
  67     abort ();
  68
  69   if (src != fdiv(dst))
  70     abort ();
  71 }
  72
  73 void
  74 dtest(double src, double dst)
  75 {
  76   if (dneg (src) != dst)
  77     abort ();
  78
  79   if (src != dneg (dst))
  80     abort ();
  81
  82   if (dmult (src) != dst)
  83     abort ();
  84
  85   if (src != dmult (dst))
  86     abort ();
  87
  88   if (ddiv (src) != dst)
  89     abort ();
  90
  91   if (src != ddiv(dst))
  92     abort ();
  93 }
  94
  95
  96 int
  97 main ()
  98 {
  99   ftest (1.0f, -1.0f);
 100   ftest (2.0f, -2.0f);
 101   ftest (-3.0f, 3.0f);
 102   ftest (0.0f, -0.0f);
 103   ftest (-0.0f, 0.0f);
 104
 105   dtest (1.0, -1.0);
 106   dtest (2.0, -2.0);
 107   dtest (-3.0, 3.0);
 108   dtest (0.0, -0.0);
 109   dtest (-0.0, 0.0);
 110
 111   return 0;
 112 }
 113