tests/test-isfinite.c

   1 /* Test of isfinite() 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, 2007, using Bruno Haible's code as a
  18    template. */
  19
  20 #include <config.h>
  21
  22 #include <math.h>
  23
  24 /* isfinite must be a macro.  */
  25 #ifndef isfinite
  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_isfinitef ()
  42 {
  43   /* Zero. */
  44   ASSERT (isfinite (0.0f));
  45   /* Subnormal values. */
  46   ASSERT (isfinite (FLT_MIN / 2));
  47   ASSERT (isfinite (-FLT_MIN / 2));
  48   /* Finite values.  */
  49   ASSERT (isfinite (3.141f));
  50   ASSERT (isfinite (3.141e30f));
  51   ASSERT (isfinite (3.141e-30f));
  52   ASSERT (isfinite (-2.718f));
  53   ASSERT (isfinite (-2.718e30f));
  54   ASSERT (isfinite (-2.718e-30f));
  55   /* Infinite values.  */
  56   ASSERT (!isfinite (Infinityf ()));
  57   ASSERT (!isfinite (- Infinityf ()));
  58   /* Quiet NaN.  */
  59   ASSERT (!isfinite (zerof / zerof));
  60 #if HAVE_SNANF
  61   /* Signalling NaN.  */
  62   ASSERT (!isfinite (SNaNf ()));
  63 #endif
  64 }
  65
  66 static void
  67 test_isfinited ()
  68 {
  69   /* Zero. */
  70   ASSERT (isfinite (0.0));
  71   /* Subnormal values. */
  72   ASSERT (isfinite (DBL_MIN / 2));
  73   ASSERT (isfinite (-DBL_MIN / 2));
  74   /* Finite values. */
  75   ASSERT (isfinite (3.141));
  76   ASSERT (isfinite (3.141e30));
  77   ASSERT (isfinite (3.141e-30));
  78   ASSERT (isfinite (-2.718));
  79   ASSERT (isfinite (-2.718e30));
  80   ASSERT (isfinite (-2.718e-30));
  81   /* Infinite values.  */
  82   ASSERT (!isfinite (Infinityd ()));
  83   ASSERT (!isfinite (- Infinityd ()));
  84   /* Quiet NaN.  */
  85   ASSERT (!isfinite (zerod / zerod));
  86 #if HAVE_SNAND
  87   /* Signalling NaN.  */
  88   ASSERT (!isfinite (SNaNd ()));
  89 #endif
  90 }
  91
  92 static void
  93 test_isfinitel ()
  94 {
  95   /* Zero. */
  96   ASSERT (isfinite (0.0L));
  97   /* Subnormal values. */
  98   ASSERT (isfinite (LDBL_MIN / 2));
  99   ASSERT (isfinite (-LDBL_MIN / 2));
 100   /* Finite values. */
 101   ASSERT (isfinite (3.141L));
 102   ASSERT (isfinite (3.141e30L));
 103   ASSERT (isfinite (3.141e-30L));
 104   ASSERT (isfinite (-2.718L));
 105   ASSERT (isfinite (-2.718e30L));
 106   ASSERT (isfinite (-2.718e-30L));
 107   /* Infinite values.  */
 108   ASSERT (!isfinite (Infinityl ()));
 109   ASSERT (!isfinite (- Infinityl ()));
 110   /* Quiet NaN.  */
 111   ASSERT (!isfinite (zerol / zerol));
 112 #if HAVE_SNANL
 113   /* Signalling NaN.  */
 114   ASSERT (!isfinite (SNaNl ()));
 115 #endif
 116
 117 #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
 118   #define NWORDS \
 119     ((sizeof (long double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
 120   typedef union { unsigned int word[NWORDS]; long double value; }
 121           memory_long_double;
 122 /* Representation of an 80-bit 'long double' as an initializer for a sequence
 123    of 'unsigned int' words.  */
 124 # ifdef WORDS_BIGENDIAN
 125 #  define LDBL80_WORDS(exponent,manthi,mantlo) \
 126      { ((unsigned int) (exponent) << 16) | ((unsigned int) (manthi) >> 16), \
 127        ((unsigned int) (manthi) << 16) | ((unsigned int) (mantlo) >> 16),   \
 128        (unsigned int) (mantlo) << 16                                        \
 129      }
 130 # else
 131 #  define LDBL80_WORDS(exponent,manthi,mantlo) \
 132      { mantlo, manthi, exponent }
 133 # endif
 134   { /* Quiet NaN.  */
 135     static memory_long_double x =
 136       { .word = LDBL80_WORDS (0xFFFF, 0xC3333333, 0x00000000) };
 137     ASSERT (!isfinite (x.value));
 138   }
 139   {
 140     /* Signalling NaN.  */
 141     static memory_long_double x =
 142       { .word = LDBL80_WORDS (0xFFFF, 0x83333333, 0x00000000) };
 143     ASSERT (!isfinite (x.value));
 144   }
 145   /* isfinite should return something for noncanonical values.  */
 146   { /* Pseudo-NaN.  */
 147     static memory_long_double x =
 148       { .word = LDBL80_WORDS (0xFFFF, 0x40000001, 0x00000000) };
 149     ASSERT (isfinite (x.value) || !isfinite (x.value));
 150   }
 151   { /* Pseudo-Infinity.  */
 152     static memory_long_double x =
 153       { .word = LDBL80_WORDS (0xFFFF, 0x00000000, 0x00000000) };
 154     ASSERT (isfinite (x.value) || !isfinite (x.value));
 155   }
 156   { /* Pseudo-Zero.  */
 157     static memory_long_double x =
 158       { .word = LDBL80_WORDS (0x4004, 0x00000000, 0x00000000) };
 159     ASSERT (isfinite (x.value) || !isfinite (x.value));
 160   }
 161   { /* Unnormalized number.  */
 162     static memory_long_double x =
 163       { .word = LDBL80_WORDS (0x4000, 0x63333333, 0x00000000) };
 164     ASSERT (isfinite (x.value) || !isfinite (x.value));
 165   }
 166   { /* Pseudo-Denormal.  */
 167     static memory_long_double x =
 168       { .word = LDBL80_WORDS (0x0000, 0x83333333, 0x00000000) };
 169     ASSERT (isfinite (x.value) || !isfinite (x.value));
 170   }
 171   #undef NWORDS
 172 #endif
 173 }
 174
 175 int
 176 main ()
 177 {
 178   test_isfinitef ();
 179   test_isfinited ();
 180   test_isfinitel ();
 181   return test_exit_status;
 182 }