NEWS.stable: log cherry-pick [e446f25]->[c092018] relocatable-shell: Update suggested...

[gnulib.git] / lib / isnanl.c

diff --git a/lib/isnanl.c b/lib/isnanl.c
index 0412c55..4575e4c 100644 (file)
--- a/lib/isnanl.c
+++ b/lib/isnanl.c
@@ -1,62 +1,20 @@
 /* Test for NaN that does not need libm.
-   Copyright (C) 2007 Free Software Foundation, Inc.
+   Copyright (C) 2007, 2009-2014 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"