tests/test-isinf.c

   1 /* Test of isinf() substitute.
   2    Copyright (C) 2007-2020 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 "macros.h"
  34
  35 float zerof = 0.0f;
  36 double zerod = 0.0;
  37 long double zerol = 0.0L;
  38
  39 static void
  40 test_isinff ()
  41 {
  42   /* Zero. */
  43   ASSERT (!isinf (0.0f));
  44   /* Subnormal values. */
  45   ASSERT (!isinf (FLT_MIN / 2));
  46   ASSERT (!isinf (-FLT_MIN / 2));
  47   /* Finite values.  */
  48   ASSERT (!isinf (3.141f));
  49   ASSERT (!isinf (3.141e30f));
  50   ASSERT (!isinf (3.141e-30f));
  51   ASSERT (!isinf (-2.718f));
  52   ASSERT (!isinf (-2.718e30f));
  53   ASSERT (!isinf (-2.718e-30f));
  54   ASSERT (!isinf (FLT_MAX));
  55   ASSERT (!isinf (-FLT_MAX));
  56   /* Infinite values.  */
  57   ASSERT (isinf (Infinityf ()));
  58   ASSERT (isinf (- Infinityf ()));
  59   /* Quiet NaN.  */
  60   ASSERT (!isinf (zerof / zerof));
  61 #if defined FLT_EXPBIT0_WORD && defined FLT_EXPBIT0_BIT
  62   /* Signalling NaN.  */
  63   {
  64     #define NWORDS \
  65       ((sizeof (float) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
  66     typedef union { float value; unsigned int word[NWORDS]; } memory_float;
  67     memory_float m;
  68     m.value = zerof / zerof;
  69 # if FLT_EXPBIT0_BIT > 0
  70     m.word[FLT_EXPBIT0_WORD] ^= (unsigned int) 1 << (FLT_EXPBIT0_BIT - 1);
  71 # else
  72     m.word[FLT_EXPBIT0_WORD + (FLT_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
  73       ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
  74 # endif
  75     if (FLT_EXPBIT0_WORD < NWORDS / 2)
  76       m.word[FLT_EXPBIT0_WORD + 1] |= (unsigned int) 1 << FLT_EXPBIT0_BIT;
  77     else
  78       m.word[0] |= (unsigned int) 1;
  79     ASSERT (!isinf (m.value));
  80     #undef NWORDS
  81   }
  82 #endif
  83 }
  84
  85 static void
  86 test_isinfd ()
  87 {
  88   /* Zero. */
  89   ASSERT (!isinf (0.0));
  90   /* Subnormal values. */
  91   ASSERT (!isinf (DBL_MIN / 2));
  92   ASSERT (!isinf (-DBL_MIN / 2));
  93   /* Finite values. */
  94   ASSERT (!isinf (3.141));
  95   ASSERT (!isinf (3.141e30));
  96   ASSERT (!isinf (3.141e-30));
  97   ASSERT (!isinf (-2.718));
  98   ASSERT (!isinf (-2.718e30));
  99   ASSERT (!isinf (-2.718e-30));
 100   ASSERT (!isinf (DBL_MAX));
 101   ASSERT (!isinf (-DBL_MAX));
 102   /* Infinite values.  */
 103   ASSERT (isinf (Infinityd ()));
 104   ASSERT (isinf (- Infinityd ()));
 105   /* Quiet NaN.  */
 106   ASSERT (!isinf (zerod / zerod));
 107 #if defined DBL_EXPBIT0_WORD && defined DBL_EXPBIT0_BIT
 108   /* Signalling NaN.  */
 109   {
 110     #define NWORDS \
 111       ((sizeof (double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
 112     typedef union { double value; unsigned int word[NWORDS]; } memory_double;
 113     memory_double m;
 114     m.value = zerod / zerod;
 115 # if DBL_EXPBIT0_BIT > 0
 116     m.word[DBL_EXPBIT0_WORD] ^= (unsigned int) 1 << (DBL_EXPBIT0_BIT - 1);
 117 # else
 118     m.word[DBL_EXPBIT0_WORD + (DBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
 119       ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
 120 # endif
 121     m.word[DBL_EXPBIT0_WORD + (DBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
 122       |= (unsigned int) 1 << DBL_EXPBIT0_BIT;
 123     ASSERT (!isinf (m.value));
 124     #undef NWORDS
 125   }
 126 #endif
 127 }
 128
 129 static void
 130 test_isinfl ()
 131 {
 132   #define NWORDS \
 133     ((sizeof (long double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
 134   typedef union { unsigned int word[NWORDS]; long double value; }
 135           memory_long_double;
 136
 137   /* Zero. */
 138   ASSERT (!isinf (0.0L));
 139   /* Subnormal values. */
 140   ASSERT (!isinf (LDBL_MIN / 2));
 141   ASSERT (!isinf (-LDBL_MIN / 2));
 142   /* Finite values. */
 143   ASSERT (!isinf (3.141L));
 144   ASSERT (!isinf (3.141e30L));
 145   ASSERT (!isinf (3.141e-30L));
 146   ASSERT (!isinf (-2.718L));
 147   ASSERT (!isinf (-2.718e30L));
 148   ASSERT (!isinf (-2.718e-30L));
 149   ASSERT (!isinf (LDBL_MAX));
 150   ASSERT (!isinf (-LDBL_MAX));
 151   /* Infinite values.  */
 152   ASSERT (isinf (Infinityl ()));
 153   ASSERT (isinf (- Infinityl ()));
 154   /* Quiet NaN.  */
 155   ASSERT (!isinf (zerol / zerol));
 156
 157 #if defined LDBL_EXPBIT0_WORD && defined LDBL_EXPBIT0_BIT
 158   /* A bit pattern that is different from a Quiet NaN.  With a bit of luck,
 159      it's a Signalling NaN.  */
 160   {
 161 #if defined __powerpc__ && LDBL_MANT_DIG == 106
 162     /* This is PowerPC "double double", a pair of two doubles.  Inf and Nan are
 163        represented as the corresponding 64-bit IEEE values in the first double;
 164        the second is ignored.  Manipulate only the first double.  */
 165     #undef NWORDS
 166     #define NWORDS \
 167       ((sizeof (double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
 168 #endif
 169
 170     memory_long_double m;
 171     m.value = zerol / zerol;
 172 # if LDBL_EXPBIT0_BIT > 0
 173     m.word[LDBL_EXPBIT0_WORD] ^= (unsigned int) 1 << (LDBL_EXPBIT0_BIT - 1);
 174 # else
 175     m.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
 176       ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
 177 # endif
 178     m.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
 179       |= (unsigned int) 1 << LDBL_EXPBIT0_BIT;
 180     ASSERT (!isinf (m.value));
 181   }
 182 #endif
 183
 184 #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
 185 /* Representation of an 80-bit 'long double' as an initializer for a sequence
 186    of 'unsigned int' words.  */
 187 # ifdef WORDS_BIGENDIAN
 188 #  define LDBL80_WORDS(exponent,manthi,mantlo) \
 189      { ((unsigned int) (exponent) << 16) | ((unsigned int) (manthi) >> 16), \
 190        ((unsigned int) (manthi) << 16) | ((unsigned int) (mantlo) >> 16),   \
 191        (unsigned int) (mantlo) << 16                                        \
 192      }
 193 # else
 194 #  define LDBL80_WORDS(exponent,manthi,mantlo) \
 195      { mantlo, manthi, exponent }
 196 # endif
 197   { /* Quiet NaN.  */
 198     static memory_long_double x =
 199       { LDBL80_WORDS (0xFFFF, 0xC3333333, 0x00000000) };
 200     ASSERT (!isinf (x.value));
 201   }
 202   {
 203     /* Signalling NaN.  */
 204     static memory_long_double x =
 205       { LDBL80_WORDS (0xFFFF, 0x83333333, 0x00000000) };
 206     ASSERT (!isinf (x.value));
 207   }
 208   /* isinf should return something for noncanonical values.  */
 209   { /* Pseudo-NaN.  */
 210     static memory_long_double x =
 211       { LDBL80_WORDS (0xFFFF, 0x40000001, 0x00000000) };
 212     ASSERT (isinf (x.value) || !isinf (x.value));
 213   }
 214   { /* Pseudo-Infinity.  */
 215     static memory_long_double x =
 216       { LDBL80_WORDS (0xFFFF, 0x00000000, 0x00000000) };
 217     ASSERT (isinf (x.value) || !isinf (x.value));
 218   }
 219   { /* Pseudo-Zero.  */
 220     static memory_long_double x =
 221       { LDBL80_WORDS (0x4004, 0x00000000, 0x00000000) };
 222     ASSERT (isinf (x.value) || !isinf (x.value));
 223   }
 224   { /* Unnormalized number.  */
 225     static memory_long_double x =
 226       { LDBL80_WORDS (0x4000, 0x63333333, 0x00000000) };
 227     ASSERT (isinf (x.value) || !isinf (x.value));
 228   }
 229   { /* Pseudo-Denormal.  */
 230     static memory_long_double x =
 231       { LDBL80_WORDS (0x0000, 0x83333333, 0x00000000) };
 232     ASSERT (isinf (x.value) || !isinf (x.value));
 233   }
 234 #endif
 235
 236   #undef NWORDS
 237 }
 238
 239 int
 240 main ()
 241 {
 242   test_isinff ();
 243   test_isinfd ();
 244   test_isinfl ();
 245   return 0;
 246 }