gl/tests/test-isnanl.h

   1 /* Test of isnanl() substitute.
   2    Copyright (C) 2007-2012 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 Bruno Haible <bruno@clisp.org>, 2007.  */
  18
  19 #include <float.h>
  20 #include <limits.h>
  21
  22 #include "minus-zero.h"
  23 #include "infinity.h"
  24 #include "nan.h"
  25 #include "macros.h"
  26
  27 int
  28 main ()
  29 {
  30   #define NWORDS \
  31     ((sizeof (long double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
  32   typedef union { unsigned int word[NWORDS]; long double value; }
  33           memory_long_double;
  34
  35   /* Finite values.  */
  36   ASSERT (!isnanl (3.141L));
  37   ASSERT (!isnanl (3.141e30L));
  38   ASSERT (!isnanl (3.141e-30L));
  39   ASSERT (!isnanl (-2.718L));
  40   ASSERT (!isnanl (-2.718e30L));
  41   ASSERT (!isnanl (-2.718e-30L));
  42   ASSERT (!isnanl (0.0L));
  43   ASSERT (!isnanl (minus_zerol));
  44   /* Infinite values.  */
  45   ASSERT (!isnanl (Infinityl ()));
  46   ASSERT (!isnanl (- Infinityl ()));
  47   /* Quiet NaN.  */
  48   ASSERT (isnanl (NaNl ()));
  49
  50 #if defined LDBL_EXPBIT0_WORD && defined LDBL_EXPBIT0_BIT
  51   /* A bit pattern that is different from a Quiet NaN.  With a bit of luck,
  52      it's a Signalling NaN.  */
  53   {
  54     memory_long_double m;
  55     m.value = NaNl ();
  56 # if LDBL_EXPBIT0_BIT > 0
  57     m.word[LDBL_EXPBIT0_WORD] ^= (unsigned int) 1 << (LDBL_EXPBIT0_BIT - 1);
  58 # else
  59     m.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
  60       ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
  61 # endif
  62     m.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
  63       |= (unsigned int) 1 << LDBL_EXPBIT0_BIT;
  64     ASSERT (isnanl (m.value));
  65   }
  66 #endif
  67
  68 #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
  69 /* Representation of an 80-bit 'long double' as an initializer for a sequence
  70    of 'unsigned int' words.  */
  71 # ifdef WORDS_BIGENDIAN
  72 #  define LDBL80_WORDS(exponent,manthi,mantlo) \
  73      { ((unsigned int) (exponent) << 16) | ((unsigned int) (manthi) >> 16), \
  74        ((unsigned int) (manthi) << 16) | (unsigned int) (mantlo) >> 16),    \
  75        (unsigned int) (mantlo) << 16                                        \
  76      }
  77 # else
  78 #  define LDBL80_WORDS(exponent,manthi,mantlo) \
  79      { mantlo, manthi, exponent }
  80 # endif
  81   { /* Quiet NaN.  */
  82     static memory_long_double x =
  83       { LDBL80_WORDS (0xFFFF, 0xC3333333, 0x00000000) };
  84     ASSERT (isnanl (x.value));
  85   }
  86   {
  87     /* Signalling NaN.  */
  88     static memory_long_double x =
  89       { LDBL80_WORDS (0xFFFF, 0x83333333, 0x00000000) };
  90     ASSERT (isnanl (x.value));
  91   }
  92   /* The isnanl function should recognize Pseudo-NaNs, Pseudo-Infinities,
  93      Pseudo-Zeroes, Unnormalized Numbers, and Pseudo-Denormals, as defined in
  94        Intel IA-64 Architecture Software Developer's Manual, Volume 1:
  95        Application Architecture.
  96        Table 5-2 "Floating-Point Register Encodings"
  97        Figure 5-6 "Memory to Floating-Point Register Data Translation"
  98    */
  99   { /* Pseudo-NaN.  */
 100     static memory_long_double x =
 101       { LDBL80_WORDS (0xFFFF, 0x40000001, 0x00000000) };
 102     ASSERT (isnanl (x.value));
 103   }
 104   { /* Pseudo-Infinity.  */
 105     static memory_long_double x =
 106       { LDBL80_WORDS (0xFFFF, 0x00000000, 0x00000000) };
 107     ASSERT (isnanl (x.value));
 108   }
 109   { /* Pseudo-Zero.  */
 110     static memory_long_double x =
 111       { LDBL80_WORDS (0x4004, 0x00000000, 0x00000000) };
 112     ASSERT (isnanl (x.value));
 113   }
 114   { /* Unnormalized number.  */
 115     static memory_long_double x =
 116       { LDBL80_WORDS (0x4000, 0x63333333, 0x00000000) };
 117     ASSERT (isnanl (x.value));
 118   }
 119   { /* Pseudo-Denormal.  */
 120     static memory_long_double x =
 121       { LDBL80_WORDS (0x0000, 0x83333333, 0x00000000) };
 122     ASSERT (isnanl (x.value));
 123   }
 124 #endif
 125
 126   return 0;
 127 }