summaryrefslogtreecommitdiff
path: root/gl/isnanf-nolibm.h
diff options
context:
space:
mode:
Diffstat (limited to 'gl/isnanf-nolibm.h')
-rw-r--r--gl/isnanf-nolibm.h33
1 files changed, 33 insertions, 0 deletions
diff --git a/gl/isnanf-nolibm.h b/gl/isnanf-nolibm.h
new file mode 100644
index 0000000000..1a1cbf94fb
--- /dev/null
+++ b/gl/isnanf-nolibm.h
@@ -0,0 +1,33 @@
+/* Test for NaN that does not need libm.
+ Copyright (C) 2007-2011 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/>. */
+
+#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