/* Test for NaN that does not need libm.
- Copyright (C) 2007 Free Software Foundation, Inc.
+ Copyright (C) 2007, 2009-2011 Free Software Foundation, Inc.
- This program is free software; you can redistribute it and/or modify
+ 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.
+ 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, write to the Free Software Foundation,
- Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
+ 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 <config.h>
-
-#include <float.h>
-#include <string.h>
-
-#define LDBL_EXP_MASK ((LDBL_MAX_EXP - LDBL_MIN_EXP) | 7)
-
-#define NWORDS \
- ((sizeof (long double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
-typedef union { long double value; unsigned int word[NWORDS]; }
- memory_long_double;
-
-int
-rpl_isnanl (long double x)
-{
-#if defined LDBL_EXPBIT0_WORD && defined LDBL_EXPBIT0_BIT
- /* Be careful to not do any floating-point operation on x, such as x == x,
- because x may be a signalling NaN. */
- static memory_long_double nan = { 0.0L / 0.0L };
- static long double plus_inf = 1.0L / 0.0L;
- static long double minus_inf = -1.0L / 0.0L;
- memory_long_double m;
-
- /* A NaN can be recognized through its exponent. But exclude +Infinity and
- -Infinity, which have the same exponent. */
- m.value = x;
- if ((((m.word[LDBL_EXPBIT0_WORD] >> LDBL_EXPBIT0_BIT)
- ^ (nan.word[LDBL_EXPBIT0_WORD] >> LDBL_EXPBIT0_BIT))
- & LDBL_EXP_MASK)
- == 0)
- return (memcmp (&m.value, &plus_inf, sizeof (long double)) != 0
- && memcmp (&m.value, &minus_inf, sizeof (long double)) != 0);
- else
- return 0;
-#else
- /* The configuration did not find sufficient information. Give up about
- the signaling NaNs, handle only the quiet NaNs. */
- if (x == x)
- return 0;
- else
- return 1;
-#endif
-}
+#define USE_LONG_DOUBLE
+#include "isnan.c"