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/* Test of isnand() substitute.
Copyright (C) 2007-2008 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 Bruno Haible <bruno@clisp.org>, 2007. */
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include "nan.h"
#define ASSERT(expr) \
do \
{ \
if (!(expr)) \
{ \
fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
fflush (stderr); \
abort (); \
} \
} \
while (0)
/* HP cc on HP-UX 10.20 has a bug with the constant expression -0.0.
So we use -zero instead. */
double zero = 0.0;
int
main ()
{
/* Finite values. */
ASSERT (!isnand (3.141));
ASSERT (!isnand (3.141e30));
ASSERT (!isnand (3.141e-30));
ASSERT (!isnand (-2.718));
ASSERT (!isnand (-2.718e30));
ASSERT (!isnand (-2.718e-30));
ASSERT (!isnand (0.0));
ASSERT (!isnand (-zero));
/* Infinite values. */
ASSERT (!isnand (1.0 / 0.0));
ASSERT (!isnand (-1.0 / 0.0));
/* Quiet NaN. */
ASSERT (isnand (NaNd ()));
#if defined DBL_EXPBIT0_WORD && defined DBL_EXPBIT0_BIT
/* Signalling NaN. */
{
#define NWORDS \
((sizeof (double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
typedef union { double value; unsigned int word[NWORDS]; } 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 < NWORDS / 2 ? 1 : - 1)]
^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
# endif
m.word[DBL_EXPBIT0_WORD + (DBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
|= (unsigned int) 1 << DBL_EXPBIT0_BIT;
ASSERT (isnand (m.value));
}
#endif
return 0;
}
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