tests/test-signbit.c

   1 /* Test of signbit() substitute.
   2    Copyright (C) 2007-2024 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation, either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 /* Written by Bruno Haible <bruno@clisp.org>, 2007.  */
  18
  19 #include <config.h>
  20
  21 #include <math.h>
  22
  23 /* signbit must be a macro.  */
  24 #ifndef signbit
  25 # error missing declaration
  26 #endif
  27
  28 #include <float.h>
  29 #include <limits.h>
  30
  31 #include "minus-zero.h"
  32 #include "infinity.h"
  33 #include "signed-nan.h"
  34 #include "signed-snan.h"
  35 #include "macros.h"
  36
  37 float zerof = 0.0f;
  38 double zerod = 0.0;
  39 long double zerol = 0.0L;
  40
  41 static void
  42 test_signbitf ()
  43 {
  44   /* Finite values.  */
  45   ASSERT (!signbit (3.141f));
  46   ASSERT (!signbit (3.141e30f));
  47   ASSERT (!signbit (3.141e-30f));
  48   ASSERT (signbit (-2.718f));
  49   ASSERT (signbit (-2.718e30f));
  50   ASSERT (signbit (-2.718e-30f));
  51   /* Zeros.  */
  52   ASSERT (!signbit (0.0f));
  53   if (1.0f / minus_zerof < 0)
  54     ASSERT (signbit (minus_zerof));
  55   else
  56     ASSERT (!signbit (minus_zerof));
  57   /* Infinite values.  */
  58   ASSERT (!signbit (Infinityf ()));
  59   ASSERT (signbit (- Infinityf ()));
  60   /* Quiet NaN.  */
  61   ASSERT (!signbit (positive_NaNf ()));
  62   ASSERT (signbit (negative_NaNf ()));
  63 #if HAVE_SNANF
  64   /* Signalling NaN.  */
  65   ASSERT (!signbit (positive_SNaNf ()));
  66   ASSERT (signbit (negative_SNaNf ()));
  67 #endif
  68 }
  69
  70 static void
  71 test_signbitd ()
  72 {
  73   /* Finite values.  */
  74   ASSERT (!signbit (3.141));
  75   ASSERT (!signbit (3.141e30));
  76   ASSERT (!signbit (3.141e-30));
  77   ASSERT (signbit (-2.718));
  78   ASSERT (signbit (-2.718e30));
  79   ASSERT (signbit (-2.718e-30));
  80   /* Zeros.  */
  81   ASSERT (!signbit (0.0));
  82   if (1.0 / minus_zerod < 0)
  83     ASSERT (signbit (minus_zerod));
  84   else
  85     ASSERT (!signbit (minus_zerod));
  86   /* Infinite values.  */
  87   ASSERT (!signbit (Infinityd ()));
  88   ASSERT (signbit (- Infinityd ()));
  89   /* Quiet NaN.  */
  90   ASSERT (!signbit (positive_NaNd ()));
  91   ASSERT (signbit (negative_NaNd ()));
  92 #if HAVE_SNAND
  93   /* Signalling NaN.  */
  94   ASSERT (!signbit (positive_SNaNd ()));
  95   ASSERT (signbit (negative_SNaNd ()));
  96 #endif
  97 }
  98
  99 static void
 100 test_signbitl ()
 101 {
 102   /* Finite values.  */
 103   ASSERT (!signbit (3.141L));
 104   ASSERT (!signbit (3.141e30L));
 105   ASSERT (!signbit (3.141e-30L));
 106   ASSERT (signbit (-2.718L));
 107   ASSERT (signbit (-2.718e30L));
 108   ASSERT (signbit (-2.718e-30L));
 109   /* Zeros.  */
 110   ASSERT (!signbit (0.0L));
 111   if (1.0L / minus_zerol < 0)
 112     ASSERT (signbit (minus_zerol));
 113   else
 114     ASSERT (!signbit (minus_zerol));
 115   /* Infinite values.  */
 116   ASSERT (!signbit (Infinityl ()));
 117   ASSERT (signbit (- Infinityl ()));
 118   /* Quiet NaN.  */
 119   ASSERT (!signbit (positive_NaNl ()));
 120   ASSERT (signbit (negative_NaNl ()));
 121 #if HAVE_SNANL
 122   /* Signalling NaN.  */
 123   ASSERT (!signbit (positive_SNaNl ()));
 124   ASSERT (signbit (negative_SNaNl ()));
 125 #endif
 126 }
 127
 128 int
 129 main ()
 130 {
 131   test_signbitf ();
 132   test_signbitd ();
 133   test_signbitl ();
 134   return test_exit_status;
 135 }