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/* Test of isnanl() substitute.
Copyright (C) 2007 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 2, 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, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
/* Written by Bruno Haible <bruno@clisp.org>, 2007. */
#include <limits.h>
#include <stdlib.h>
#define ASSERT(expr) if (!(expr)) abort ();
int
main ()
{
/* Finite values. */
ASSERT (!isnanl (3.141L));
ASSERT (!isnanl (3.141e30L));
ASSERT (!isnanl (3.141e-30L));
ASSERT (!isnanl (-2.718L));
ASSERT (!isnanl (-2.718e30L));
ASSERT (!isnanl (-2.718e-30L));
/* Infinite values. */
ASSERT (!isnanl (1.0L / 0.0L));
ASSERT (!isnanl (-1.0L / 0.0L));
/* Quiet NaN. */
ASSERT (isnanl (0.0L / 0.0L));
#if defined LDBL_EXPBIT0_WORD && defined LDBL_EXPBIT0_BIT
/* Signalling NaN. */
{
#define NWORDS \
((sizeof (long double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
typedef union { long double value; unsigned int word[NWORDS]; }
memory_long_double;
memory_long_double m;
m.value = 0.0L / 0.0L;
# 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 < NWORDS / 2 ? 1 : - 1)]
^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
# endif
m.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
|= (unsigned int) 1 << LDBL_EXPBIT0_BIT;
ASSERT (isnanl (m.value));
}
#endif
return 0;
}
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