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authorAndreas Rottmann <a.rottmann@gmx.at>2009-09-14 12:32:44 +0200
committerAndreas Rottmann <a.rottmann@gmx.at>2009-09-14 12:32:44 +0200
commitfa095a4504cbe668e4244547e2c141597bea4ecf (patch)
tree06135820a286ffec47804e75fbf8a147e92acd2e /lib/isnanf-nolibm.h
Imported Upstream version 0.9.1upstream/0.9.1
Diffstat (limited to 'lib/isnanf-nolibm.h')
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diff --git a/lib/isnanf-nolibm.h b/lib/isnanf-nolibm.h
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+/* Test for NaN that does not need libm.
+ 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 Lesser 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 Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+#if HAVE_ISNANF_IN_LIBC
+/* Get declaration of isnan macro or (older) isnanf function. */
+# include <math.h>
+# if __GNUC__ >= 4
+ /* GCC 4.0 and newer provides three built-ins for isnan. */
+# undef isnanf
+# define isnanf(x) __builtin_isnanf ((float)(x))
+# elif defined isnan
+# undef isnanf
+# define isnanf(x) isnan ((float)(x))
+# endif
+#else
+/* Test whether X is a NaN. */
+# undef isnanf
+# define isnanf rpl_isnanf
+extern int isnanf (float x);
+#endif