tests/test-isfinite.c

   1 /* Test of isfinite() substitute.
   2    Copyright (C) 2007-2011 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 <http://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 "macros.h"
  33
  34 float zerof = 0.0f;
  35 double zerod = 0.0;
  36 long double zerol = 0.0L;
  37
  38 static void
  39 test_isfinitef ()
  40 {
  41   /* Zero. */
  42   ASSERT (isfinite (0.0f));
  43   /* Subnormal values. */
  44   ASSERT (isfinite (FLT_MIN / 2));
  45   ASSERT (isfinite (-FLT_MIN / 2));
  46   /* Finite values.  */
  47   ASSERT (isfinite (3.141f));
  48   ASSERT (isfinite (3.141e30f));
  49   ASSERT (isfinite (3.141e-30f));
  50   ASSERT (isfinite (-2.718f));
  51   ASSERT (isfinite (-2.718e30f));
  52   ASSERT (isfinite (-2.718e-30f));
  53   /* Infinite values.  */
  54   ASSERT (!isfinite (1.0f / 0.0f));
  55   ASSERT (!isfinite (-1.0f / 0.0f));
  56   /* Quiet NaN.  */
  57   ASSERT (!isfinite (zerof / zerof));
  58 #if defined FLT_EXPBIT0_WORD && defined FLT_EXPBIT0_BIT
  59   /* Signalling NaN.  */
  60   {
  61     #define NWORDS \
  62       ((sizeof (float) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
  63     typedef union { float value; unsigned int word[NWORDS]; } memory_float;
  64     memory_float m;
  65     m.value = zerof / zerof;
  66 # if FLT_EXPBIT0_BIT > 0
  67     m.word[FLT_EXPBIT0_WORD] ^= (unsigned int) 1 << (FLT_EXPBIT0_BIT - 1);
  68 # else
  69     m.word[FLT_EXPBIT0_WORD + (FLT_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
  70       ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
  71 # endif
  72     if (FLT_EXPBIT0_WORD < NWORDS / 2)
  73       m.word[FLT_EXPBIT0_WORD + 1] |= (unsigned int) 1 << FLT_EXPBIT0_BIT;
  74     else
  75       m.word[0] |= (unsigned int) 1;
  76     ASSERT (!isfinite (m.value));
  77     #undef NWORDS
  78   }
  79 #endif
  80 }
  81
  82 static void
  83 test_isfinited ()
  84 {
  85   /* Zero. */
  86   ASSERT (isfinite (0.0));
  87   /* Subnormal values. */
  88   ASSERT (isfinite (DBL_MIN / 2));
  89   ASSERT (isfinite (-DBL_MIN / 2));
  90   /* Finite values. */
  91   ASSERT (isfinite (3.141));
  92   ASSERT (isfinite (3.141e30));
  93   ASSERT (isfinite (3.141e-30));
  94   ASSERT (isfinite (-2.718));
  95   ASSERT (isfinite (-2.718e30));
  96   ASSERT (isfinite (-2.718e-30));
  97   /* Infinite values.  */
  98   ASSERT (!isfinite (1.0 / 0.0));
  99   ASSERT (!isfinite (-1.0 / 0.0));
 100   /* Quiet NaN.  */
 101   ASSERT (!isfinite (zerod / zerod));
 102 #if defined DBL_EXPBIT0_WORD && defined DBL_EXPBIT0_BIT
 103   /* Signalling NaN.  */
 104   {
 105     #define NWORDS \
 106       ((sizeof (double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
 107     typedef union { double value; unsigned int word[NWORDS]; } memory_double;
 108     memory_double m;
 109     m.value = zerod / zerod;
 110 # if DBL_EXPBIT0_BIT > 0
 111     m.word[DBL_EXPBIT0_WORD] ^= (unsigned int) 1 << (DBL_EXPBIT0_BIT - 1);
 112 # else
 113     m.word[DBL_EXPBIT0_WORD + (DBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
 114       ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
 115 # endif
 116     m.word[DBL_EXPBIT0_WORD + (DBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
 117       |= (unsigned int) 1 << DBL_EXPBIT0_BIT;
 118     ASSERT (!isfinite (m.value));
 119     #undef NWORDS
 120   }
 121 #endif
 122 }
 123
 124 static void
 125 test_isfinitel ()
 126 {
 127   #define NWORDS \
 128     ((sizeof (long double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
 129   typedef union { unsigned int word[NWORDS]; long double value; }
 130           memory_long_double;
 131
 132   /* Zero. */
 133   ASSERT (isfinite (0.0L));
 134   /* Subnormal values. */
 135   ASSERT (isfinite (LDBL_MIN / 2));
 136   ASSERT (isfinite (-LDBL_MIN / 2));
 137   /* Finite values. */
 138   ASSERT (isfinite (3.141L));
 139   ASSERT (isfinite (3.141e30L));
 140   ASSERT (isfinite (3.141e-30L));
 141   ASSERT (isfinite (-2.718L));
 142   ASSERT (isfinite (-2.718e30L));
 143   ASSERT (isfinite (-2.718e-30L));
 144   /* Infinite values.  */
 145   ASSERT (!isfinite (1.0L / 0.0L));
 146   ASSERT (!isfinite (-1.0L / 0.0L));
 147   /* Quiet NaN.  */
 148   ASSERT (!isfinite (zerol / zerol));
 149
 150 #if defined LDBL_EXPBIT0_WORD && defined LDBL_EXPBIT0_BIT
 151   /* A bit pattern that is different from a Quiet NaN.  With a bit of luck,
 152      it's a Signalling NaN.  */
 153   {
 154     memory_long_double m;
 155     m.value = zerol / zerol;
 156 # if LDBL_EXPBIT0_BIT > 0
 157     m.word[LDBL_EXPBIT0_WORD] ^= (unsigned int) 1 << (LDBL_EXPBIT0_BIT - 1);
 158 # else
 159     m.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
 160       ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
 161 # endif
 162     m.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
 163       |= (unsigned int) 1 << LDBL_EXPBIT0_BIT;
 164     ASSERT (!isfinite (m.value));
 165   }
 166 #endif
 167
 168 #if ((defined __ia64 && LDBL_MANT_DIG == 64) || (defined __x86_64__ || defined __amd64__) || (defined __i386 || defined __i386__ || defined _I386 || defined _M_IX86 || defined _X86_))
 169 /* Representation of an 80-bit 'long double' as an initializer for a sequence
 170    of 'unsigned int' words.  */
 171 # ifdef WORDS_BIGENDIAN
 172 #  define LDBL80_WORDS(exponent,manthi,mantlo) \
 173      { ((unsigned int) (exponent) << 16) | ((unsigned int) (manthi) >> 16), \
 174        ((unsigned int) (manthi) << 16) | (unsigned int) (mantlo) >> 16),    \
 175        (unsigned int) (mantlo) << 16                                        \
 176      }
 177 # else
 178 #  define LDBL80_WORDS(exponent,manthi,mantlo) \
 179      { mantlo, manthi, exponent }
 180 # endif
 181   { /* Quiet NaN.  */
 182     static memory_long_double x =
 183       { LDBL80_WORDS (0xFFFF, 0xC3333333, 0x00000000) };
 184     ASSERT (!isfinite (x.value));
 185   }
 186   {
 187     /* Signalling NaN.  */
 188     static memory_long_double x =
 189       { LDBL80_WORDS (0xFFFF, 0x83333333, 0x00000000) };
 190     ASSERT (!isfinite (x.value));
 191   }
 192   /* The isnanl function should recognize Pseudo-NaNs, Pseudo-Infinities,
 193      Pseudo-Zeroes, Unnormalized Numbers, and Pseudo-Denormals, as defined in
 194        Intel IA-64 Architecture Software Developer's Manual, Volume 1:
 195        Application Architecture.
 196        Table 5-2 "Floating-Point Register Encodings"
 197        Figure 5-6 "Memory to Floating-Point Register Data Translation"
 198    */
 199   { /* Pseudo-NaN.  */
 200     static memory_long_double x =
 201       { LDBL80_WORDS (0xFFFF, 0x40000001, 0x00000000) };
 202     ASSERT (!isfinite (x.value));
 203   }
 204   { /* Pseudo-Infinity.  */
 205     static memory_long_double x =
 206       { LDBL80_WORDS (0xFFFF, 0x00000000, 0x00000000) };
 207     ASSERT (!isfinite (x.value));
 208   }
 209   { /* Pseudo-Zero.  */
 210     static memory_long_double x =
 211       { LDBL80_WORDS (0x4004, 0x00000000, 0x00000000) };
 212     ASSERT (!isfinite (x.value));
 213   }
 214   { /* Unnormalized number.  */
 215     static memory_long_double x =
 216       { LDBL80_WORDS (0x4000, 0x63333333, 0x00000000) };
 217     ASSERT (!isfinite (x.value));
 218   }
 219   { /* Pseudo-Denormal.  */
 220     static memory_long_double x =
 221       { LDBL80_WORDS (0x0000, 0x83333333, 0x00000000) };
 222     ASSERT (!isfinite (x.value));
 223   }
 224 #endif
 225
 226   #undef NWORDS
 227 }
 228
 229 int
 230 main ()
 231 {
 232   test_isfinitef ();
 233   test_isfinited ();
 234   test_isfinitel ();
 235   return 0;
 236 }