The C and C++ Include Header Files

/usr/include/x86_64-linux-gnu/bits/fp-fast.h


$ cat -n /usr/include/x86_64-linux-gnu/bits/fp-fast.h

     1	/* Define FP_FAST_* macros.
     2	   Copyright (C) 2016-2024 Free Software Foundation, Inc.
     3	   This file is part of the GNU C Library.
     4	
     5	   The GNU C Library is free software; you can redistribute it and/or
     6	   modify it under the terms of the GNU Lesser General Public
     7	   License as published by the Free Software Foundation; either
     8	   version 2.1 of the License, or (at your option) any later version.
     9	
    10	   The GNU C Library is distributed in the hope that it will be useful,
    11	   but WITHOUT ANY WARRANTY; without even the implied warranty of
    12	   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    13	   Lesser General Public License for more details.
    14	
    15	   You should have received a copy of the GNU Lesser General Public
    16	   License along with the GNU C Library; if not, see
    17	   <https://www.gnu.org/licenses/>.  */
    18	
    19	#ifndef _MATH_H
    20	# error "Never use <bits/fp-fast.h> directly; include <math.h> instead."
    21	#endif
    22	
    23	#ifdef __USE_ISOC99
    24	
    25	/* The GCC 4.6 compiler will define __FP_FAST_FMA{,F,L} if the fma{,f,l}
    26	   builtins are supported.  */
    27	# ifdef __FP_FAST_FMA
    28	#  define FP_FAST_FMA 1
    29	# endif
    30	
    31	# ifdef __FP_FAST_FMAF
    32	#  define FP_FAST_FMAF 1
    33	# endif
    34	
    35	# ifdef __FP_FAST_FMAL
    36	#  define FP_FAST_FMAL 1
    37	# endif
    38	
    39	#endif