tests/test-isinf.c

   1 /* Test of isinf() 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 Ben Pfaff, 2008, using Bruno Haible's code as a
  18    template. */
  19
  20 #include <config.h>
  21
  22 #include <math.h>
  23
  24 /* isinf must be a macro.  */
  25 #ifndef isinf
  26 # error missing declaration
  27 #endif
  28
  29 #include <float.h>
  30 #include <limits.h>
  31
  32 #include "infinity.h"
  33 #include "snan.h"
  34 #include "macros.h"
  35
  36 float zerof = 0.0f;
  37 double zerod = 0.0;
  38 long double zerol = 0.0L;
  39
  40 static void
  41 test_isinff ()
  42 {
  43   /* Zero. */
  44   ASSERT (!isinf (0.0f));
  45   /* Subnormal values. */
  46   ASSERT (!isinf (FLT_MIN / 2));
  47   ASSERT (!isinf (-FLT_MIN / 2));
  48   /* Finite values.  */
  49   ASSERT (!isinf (3.141f));
  50   ASSERT (!isinf (3.141e30f));
  51   ASSERT (!isinf (3.141e-30f));
  52   ASSERT (!isinf (-2.718f));
  53   ASSERT (!isinf (-2.718e30f));
  54   ASSERT (!isinf (-2.718e-30f));
  55   ASSERT (!isinf (FLT_MAX));
  56   ASSERT (!isinf (-FLT_MAX));
  57   /* Infinite values.  */
  58   ASSERT (isinf (Infinityf ()));
  59   ASSERT (isinf (- Infinityf ()));
  60   /* Quiet NaN.  */
  61   ASSERT (!isinf (zerof / zerof));
  62 #if HAVE_SNANF
  63   /* Signalling NaN.  */
  64   ASSERT (!isinf (SNaNf ()));
  65 #endif
  66 }
  67
  68 static void
  69 test_isinfd ()
  70 {
  71   /* Zero. */
  72   ASSERT (!isinf (0.0));
  73   /* Subnormal values. */
  74   ASSERT (!isinf (DBL_MIN / 2));
  75   ASSERT (!isinf (-DBL_MIN / 2));
  76   /* Finite values. */
  77   ASSERT (!isinf (3.141));
  78   ASSERT (!isinf (3.141e30));
  79   ASSERT (!isinf (3.141e-30));
  80   ASSERT (!isinf (-2.718));
  81   ASSERT (!isinf (-2.718e30));
  82   ASSERT (!isinf (-2.718e-30));
  83   ASSERT (!isinf (DBL_MAX));
  84   ASSERT (!isinf (-DBL_MAX));
  85   /* Infinite values.  */
  86   ASSERT (isinf (Infinityd ()));
  87   ASSERT (isinf (- Infinityd ()));
  88   /* Quiet NaN.  */
  89   ASSERT (!isinf (zerod / zerod));
  90 #if HAVE_SNAND
  91   /* Signalling NaN.  */
  92   ASSERT (!isinf (SNaNd ()));
  93 #endif
  94 }
  95
  96 static void
  97 test_isinfl ()
  98 {
  99   /* Zero. */
 100   ASSERT (!isinf (0.0L));
 101   /* Subnormal values. */
 102   ASSERT (!isinf (LDBL_MIN / 2));
 103   ASSERT (!isinf (-LDBL_MIN / 2));
 104   /* Finite values. */
 105   ASSERT (!isinf (3.141L));
 106   ASSERT (!isinf (3.141e30L));
 107   ASSERT (!isinf (3.141e-30L));
 108   ASSERT (!isinf (-2.718L));
 109   ASSERT (!isinf (-2.718e30L));
 110   ASSERT (!isinf (-2.718e-30L));
 111   ASSERT (!isinf (LDBL_MAX));
 112   ASSERT (!isinf (-LDBL_MAX));
 113   /* Infinite values.  */
 114   ASSERT (isinf (Infinityl ()));
 115   ASSERT (isinf (- Infinityl ()));
 116   /* Quiet NaN.  */
 117   ASSERT (!isinf (zerol / zerol));
 118 #if HAVE_SNANL
 119   /* Signalling NaN.  */
 120   ASSERT (!isinf (SNaNl ()));
 121 #endif
 122
 123 #if ((defined __ia64 && LDBL_MANT_DIG == 64) || (defined __x86_64__ || defined __amd64__) || (defined __i386 || defined __i386__ || defined _I386 || defined _M_IX86 || defined _X86_)) && !HAVE_SAME_LONG_DOUBLE_AS_DOUBLE
 124   #define NWORDS \
 125     ((sizeof (long double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
 126   typedef union { unsigned int word[NWORDS]; long double value; }
 127           memory_long_double;
 128 /* Representation of an 80-bit 'long double' as an initializer for a sequence
 129    of 'unsigned int' words.  */
 130 # ifdef WORDS_BIGENDIAN
 131 #  define LDBL80_WORDS(exponent,manthi,mantlo) \
 132      { ((unsigned int) (exponent) << 16) | ((unsigned int) (manthi) >> 16), \
 133        ((unsigned int) (manthi) << 16) | ((unsigned int) (mantlo) >> 16),   \
 134        (unsigned int) (mantlo) << 16                                        \
 135      }
 136 # else
 137 #  define LDBL80_WORDS(exponent,manthi,mantlo) \
 138      { mantlo, manthi, exponent }
 139 # endif
 140   { /* Quiet NaN.  */
 141     static memory_long_double x =
 142       { .word = LDBL80_WORDS (0xFFFF, 0xC3333333, 0x00000000) };
 143     ASSERT (!isinf (x.value));
 144   }
 145   {
 146     /* Signalling NaN.  */
 147     static memory_long_double x =
 148       { .word = LDBL80_WORDS (0xFFFF, 0x83333333, 0x00000000) };
 149     ASSERT (!isinf (x.value));
 150   }
 151   /* isinf should return something for noncanonical values.  */
 152   { /* Pseudo-NaN.  */
 153     static memory_long_double x =
 154       { .word = LDBL80_WORDS (0xFFFF, 0x40000001, 0x00000000) };
 155     ASSERT (isinf (x.value) || !isinf (x.value));
 156   }
 157   { /* Pseudo-Infinity.  */
 158     static memory_long_double x =
 159       { .word = LDBL80_WORDS (0xFFFF, 0x00000000, 0x00000000) };
 160     ASSERT (isinf (x.value) || !isinf (x.value));
 161   }
 162   { /* Pseudo-Zero.  */
 163     static memory_long_double x =
 164       { .word = LDBL80_WORDS (0x4004, 0x00000000, 0x00000000) };
 165     ASSERT (isinf (x.value) || !isinf (x.value));
 166   }
 167   { /* Unnormalized number.  */
 168     static memory_long_double x =
 169       { .word = LDBL80_WORDS (0x4000, 0x63333333, 0x00000000) };
 170     ASSERT (isinf (x.value) || !isinf (x.value));
 171   }
 172   { /* Pseudo-Denormal.  */
 173     static memory_long_double x =
 174       { .word = LDBL80_WORDS (0x0000, 0x83333333, 0x00000000) };
 175     ASSERT (isinf (x.value) || !isinf (x.value));
 176   }
 177   #undef NWORDS
 178 #endif
 179 }
 180
 181 int
 182 main ()
 183 {
 184   test_isinff ();
 185   test_isinfd ();
 186   test_isinfl ();
 187   return test_exit_status;
 188 }