tests/test-isnanl.h

   1 /* Test of isnanl() substitute.
   2    Copyright (C) 2007-2018 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 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 #if defined __powerpc__ && LDBL_MANT_DIG == 106
  55     /* This is PowerPC "double double", a pair of two doubles.  Inf and Nan are
  56        represented as the corresponding 64-bit IEEE values in the first double;
  57        the second is ignored.  Manipulate only the first double.  */
  58     #undef NWORDS
  59     #define NWORDS \
  60       ((sizeof (double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
  61 #endif
  62
  63     memory_long_double m;
  64     m.value = NaNl ();
  65 # if LDBL_EXPBIT0_BIT > 0
  66     m.word[LDBL_EXPBIT0_WORD] ^= (unsigned int) 1 << (LDBL_EXPBIT0_BIT - 1);
  67 # else
  68     m.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
  69       ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
  70 # endif
  71     m.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
  72       |= (unsigned int) 1 << LDBL_EXPBIT0_BIT;
  73     ASSERT (isnanl (m.value));
  74   }
  75 #endif
  76
  77 #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
  78 /* Representation of an 80-bit 'long double' as an initializer for a sequence
  79    of 'unsigned int' words.  */
  80 # ifdef WORDS_BIGENDIAN
  81 #  define LDBL80_WORDS(exponent,manthi,mantlo) \
  82      { ((unsigned int) (exponent) << 16) | ((unsigned int) (manthi) >> 16), \
  83        ((unsigned int) (manthi) << 16) | ((unsigned int) (mantlo) >> 16),   \
  84        (unsigned int) (mantlo) << 16                                        \
  85      }
  86 # else
  87 #  define LDBL80_WORDS(exponent,manthi,mantlo) \
  88      { mantlo, manthi, exponent }
  89 # endif
  90   { /* Quiet NaN.  */
  91     static memory_long_double x =
  92       { LDBL80_WORDS (0xFFFF, 0xC3333333, 0x00000000) };
  93     ASSERT (isnanl (x.value));
  94   }
  95   {
  96     /* Signalling NaN.  */
  97     static memory_long_double x =
  98       { LDBL80_WORDS (0xFFFF, 0x83333333, 0x00000000) };
  99     ASSERT (isnanl (x.value));
 100   }
 101   /* isnanl should return something for noncanonical values.  */
 102   { /* Pseudo-NaN.  */
 103     static memory_long_double x =
 104       { LDBL80_WORDS (0xFFFF, 0x40000001, 0x00000000) };
 105     ASSERT (isnanl (x.value) || !isnanl (x.value));
 106   }
 107   { /* Pseudo-Infinity.  */
 108     static memory_long_double x =
 109       { LDBL80_WORDS (0xFFFF, 0x00000000, 0x00000000) };
 110     ASSERT (isnanl (x.value) || !isnanl (x.value));
 111   }
 112   { /* Pseudo-Zero.  */
 113     static memory_long_double x =
 114       { LDBL80_WORDS (0x4004, 0x00000000, 0x00000000) };
 115     ASSERT (isnanl (x.value) || !isnanl (x.value));
 116   }
 117   { /* Unnormalized number.  */
 118     static memory_long_double x =
 119       { LDBL80_WORDS (0x4000, 0x63333333, 0x00000000) };
 120     ASSERT (isnanl (x.value) || !isnanl (x.value));
 121   }
 122   { /* Pseudo-Denormal.  */
 123     static memory_long_double x =
 124       { LDBL80_WORDS (0x0000, 0x83333333, 0x00000000) };
 125     ASSERT (isnanl (x.value) || !isnanl (x.value));
 126   }
 127 #endif
 128
 129   return 0;
 130 }