text: /* Test of isnand() substitute.
     Copyright (C) 2007-2010 Free Software Foundation, Inc.
  
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
  
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  
  /* Written by Ben Pfaff <blp@cs.stanford.edu>, from code by Bruno
     Haible <bruno@clisp.org>.  */
  
  #include <config.h>
  
  #include <math.h>
  
  /* isnan must be a macro.  */
  #ifndef isnan
  # error missing declaration
  #endif
  
  #include <float.h>
  #include <limits.h>
  
  #include "nan.h"
  #include "macros.h"
  
  /* HP cc on HP-UX 10.20 has a bug with the constant expression -0.0f.
     So we use -zero instead.  */
  float zerof = 0.0f;
  
  /* HP cc on HP-UX 10.20 has a bug with the constant expression -0.0.
     So we use -zero instead.  */
  double zerod = 0.0;
  
  /* On HP-UX 10.20, negating 0.0L does not yield -0.0L.
     So we use minus_zerol instead.
     IRIX cc can't put -0.0L into .data, but can compute at runtime.
     Note that the expression -LDBL_MIN * LDBL_MIN does not work on other
     platforms, such as when cross-compiling to PowerPC on MacOS X 10.5.  */
  #if defined __hpux || defined __sgi
  static long double
  compute_minus_zerol (void)
  {
    return -LDBL_MIN * LDBL_MIN;
  }
  # define minus_zerol compute_minus_zerol ()
  #else
  long double minus_zerol = -0.0L;
  #endif
  
  static void
  test_float (void)
  {
    /* Finite values.  */
    ASSERT (!isnan (3.141f));
    ASSERT (!isnan (3.141e30f));
    ASSERT (!isnan (3.141e-30f));
    ASSERT (!isnan (-2.718f));
    ASSERT (!isnan (-2.718e30f));
    ASSERT (!isnan (-2.718e-30f));
    ASSERT (!isnan (0.0f));
    ASSERT (!isnan (-zerof));
    /* Infinite values.  */
    ASSERT (!isnan (1.0f / 0.0f));
    ASSERT (!isnan (-1.0f / 0.0f));
    /* Quiet NaN.  */
    ASSERT (isnan (NaNf ()));
  #if defined FLT_EXPBIT0_WORD && defined FLT_EXPBIT0_BIT
    /* Signalling NaN.  */
    {
      #define NWORDSF \
        ((sizeof (float) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
      typedef union { float value; unsigned int word[NWORDSF]; } memory_float;
      memory_float m;
      m.value = NaNf ();
  # if FLT_EXPBIT0_BIT > 0
      m.word[FLT_EXPBIT0_WORD] ^= (unsigned int) 1 << (FLT_EXPBIT0_BIT - 1);
  # else
      m.word[FLT_EXPBIT0_WORD + (FLT_EXPBIT0_WORD < NWORDSF / 2 ? 1 : - 1)]
        ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
  # endif
      if (FLT_EXPBIT0_WORD < NWORDSF / 2)
        m.word[FLT_EXPBIT0_WORD + 1] |= (unsigned int) 1 << FLT_EXPBIT0_BIT;
      else
        m.word[0] |= (unsigned int) 1;
      ASSERT (isnan (m.value));
    }
  #endif
  }
  
  static void
  test_double (void)
  {
    /* Finite values.  */
    ASSERT (!isnan (3.141));
    ASSERT (!isnan (3.141e30));
    ASSERT (!isnan (3.141e-30));
    ASSERT (!isnan (-2.718));
    ASSERT (!isnan (-2.718e30));
    ASSERT (!isnan (-2.718e-30));
    ASSERT (!isnan (0.0));
    ASSERT (!isnan (-zerod));
    /* Infinite values.  */
    ASSERT (!isnan (1.0 / 0.0));
    ASSERT (!isnan (-1.0 / 0.0));
    /* Quiet NaN.  */
    ASSERT (isnan (NaNd ()));
  #if defined DBL_EXPBIT0_WORD && defined DBL_EXPBIT0_BIT
    /* Signalling NaN.  */
    {
      #define NWORDSD \
        ((sizeof (double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
      typedef union { double value; unsigned int word[NWORDSD]; } memory_double;
      memory_double m;
      m.value = NaNd ();
  # if DBL_EXPBIT0_BIT > 0
      m.word[DBL_EXPBIT0_WORD] ^= (unsigned int) 1 << (DBL_EXPBIT0_BIT - 1);
  # else
      m.word[DBL_EXPBIT0_WORD + (DBL_EXPBIT0_WORD < NWORDSD / 2 ? 1 : - 1)]
        ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
  # endif
      m.word[DBL_EXPBIT0_WORD + (DBL_EXPBIT0_WORD < NWORDSD / 2 ? 1 : - 1)]
        |= (unsigned int) 1 << DBL_EXPBIT0_BIT;
      ASSERT (isnan (m.value));
    }
  #endif
  }
  
  static void
  test_long_double (void)
  {
    #define NWORDSL \
      ((sizeof (long double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
    typedef union { unsigned int word[NWORDSL]; long double value; }
            memory_long_double;
  
    /* Finite values.  */
    ASSERT (!isnan (3.141L));
    ASSERT (!isnan (3.141e30L));
    ASSERT (!isnan (3.141e-30L));
    ASSERT (!isnan (-2.718L));
    ASSERT (!isnan (-2.718e30L));
    ASSERT (!isnan (-2.718e-30L));
    ASSERT (!isnan (0.0L));
    ASSERT (!isnan (minus_zerol));
    /* Infinite values.  */
    ASSERT (!isnan (1.0L / 0.0L));
    ASSERT (!isnan (-1.0L / 0.0L));
    /* Quiet NaN.  */
    ASSERT (isnan (NaNl ()));
  
  #if defined LDBL_EXPBIT0_WORD && defined LDBL_EXPBIT0_BIT
    /* A bit pattern that is different from a Quiet NaN.  With a bit of luck,
       it's a Signalling NaN.  */
    {
      memory_long_double m;
      m.value = NaNl ();
  # if LDBL_EXPBIT0_BIT > 0
      m.word[LDBL_EXPBIT0_WORD] ^= (unsigned int) 1 << (LDBL_EXPBIT0_BIT - 1);
  # else
      m.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD < NWORDSL / 2 ? 1 : - 1)]
        ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
  # endif
      m.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD < NWORDSL / 2 ? 1 : - 1)]
        |= (unsigned int) 1 << LDBL_EXPBIT0_BIT;
      ASSERT (isnan (m.value));
    }
  #endif
  
  #if ((defined __ia64 && LDBL_MANT_DIG == 64) || (defined __x86_64__ || defined __amd64__) || (defined __i386 || defined __i386__ || defined _I386 || defined _M_IX86 || defined _X86_))
  /* Representation of an 80-bit 'long double' as an initializer for a sequence
     of 'unsigned int' words.  */
  # ifdef WORDS_BIGENDIAN
  #  define LDBL80_WORDS(exponent,manthi,mantlo) \
       { ((unsigned int) (exponent) << 16) | ((unsigned int) (manthi) >> 16), \
         ((unsigned int) (manthi) << 16) | (unsigned int) (mantlo) >> 16),    \
         (unsigned int) (mantlo) << 16                                        \
       }
  # else
  #  define LDBL80_WORDS(exponent,manthi,mantlo) \
       { mantlo, manthi, exponent }
  # endif
    { /* Quiet NaN.  */
      static memory_long_double x =
        { LDBL80_WORDS (0xFFFF, 0xC3333333, 0x00000000) };
      ASSERT (isnan (x.value));
    }
    {
      /* Signalling NaN.  */
      static memory_long_double x =
        { LDBL80_WORDS (0xFFFF, 0x83333333, 0x00000000) };
      ASSERT (isnan (x.value));
    }
    /* The isnan function should recognize Pseudo-NaNs, Pseudo-Infinities,
       Pseudo-Zeroes, Unnormalized Numbers, and Pseudo-Denormals, as defined in
         Intel IA-64 Architecture Software Developer's Manual, Volume 1:
         Application Architecture.
         Table 5-2 "Floating-Point Register Encodings"
         Figure 5-6 "Memory to Floating-Point Register Data Translation"
     */
    { /* Pseudo-NaN.  */
      static memory_long_double x =
        { LDBL80_WORDS (0xFFFF, 0x40000001, 0x00000000) };
      ASSERT (isnan (x.value));
    }
    { /* Pseudo-Infinity.  */
      static memory_long_double x =
        { LDBL80_WORDS (0xFFFF, 0x00000000, 0x00000000) };
      ASSERT (isnan (x.value));
    }
    { /* Pseudo-Zero.  */
      static memory_long_double x =
        { LDBL80_WORDS (0x4004, 0x00000000, 0x00000000) };
      ASSERT (isnan (x.value));
    }
    { /* Unnormalized number.  */
      static memory_long_double x =
        { LDBL80_WORDS (0x4000, 0x63333333, 0x00000000) };
      ASSERT (isnan (x.value));
    }
    { /* Pseudo-Denormal.  */
      static memory_long_double x =
        { LDBL80_WORDS (0x0000, 0x83333333, 0x00000000) };
      ASSERT (isnan (x.value));
    }
  #endif
  }
  
  int
  main ()
  {
    test_float ();
    test_double ();
    test_long_double ();
    return 0;
  }
  