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-rw-r--r--bits/fp-fast.h39
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diff --git a/bits/fp-fast.h b/bits/fp-fast.h
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+/* Define FP_FAST_* macros.
+ Copyright (C) 2016-2018 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library 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 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library 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 the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#ifndef _MATH_H
+# error "Never use <bits/fp-fast.h> directly; include <math.h> instead."
+#endif
+
+#ifdef __USE_ISOC99
+
+/* The GCC 4.6 compiler will define __FP_FAST_FMA{,F,L} if the fma{,f,l}
+ builtins are supported. */
+# ifdef __FP_FAST_FMA
+# define FP_FAST_FMA 1
+# endif
+
+# ifdef __FP_FAST_FMAF
+# define FP_FAST_FMAF 1
+# endif
+
+# ifdef __FP_FAST_FMAL
+# define FP_FAST_FMAL 1
+# endif
+
+#endif