sysdeps/x86/bits/mathdef.h

   1 /* Copyright (C) 2001-2016 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #if !defined _MATH_H && !defined _COMPLEX_H
  19 # error "Never use <bits/mathdef.h> directly; include <math.h> instead"
  20 #endif
  21
  22 #if defined __USE_ISOC99 && defined _MATH_H && !defined _MATH_H_MATHDEF
  23 # define _MATH_H_MATHDEF        1
  24
  25 # if ((defined __x86_64__ && !defined __FLT_EVAL_METHOD__)              \
  26       || (defined __FLT_EVAL_METHOD__ && __FLT_EVAL_METHOD__ == 0))
  27 /* The x86-64 architecture computes values with the precission of the
  28    used type.  Similarly for -m32 -mfpmath=sse.  */
  29 typedef float float_t;          /* `float' expressions are evaluated as `float'.  */
  30 typedef double double_t;        /* `double' expressions are evaluated
  31                                    as `double'.  */
  32 # else
  33 /* The ix87 FPUs evaluate all values in the 80 bit floating-point format
  34    which is also available for the user as `long double'.  Therefore we
  35    define:  */
  36 typedef long double float_t;    /* `float' expressions are evaluated as
  37                                    `long double'.  */
  38 typedef long double double_t;   /* `double' expressions are evaluated as
  39                                    `long double'.  */
  40 # endif
  41
  42 /* The values returned by `ilogb' for 0 and NaN respectively.  */
  43 # define FP_ILOGB0      (-2147483647 - 1)
  44 # define FP_ILOGBNAN    (-2147483647 - 1)
  45
  46 /* The GCC 4.6 compiler will define __FP_FAST_FMA{,F,L} if the fma{,f,l}
  47    builtins are supported.  */
  48 # ifdef __FP_FAST_FMA
  49 #  define FP_FAST_FMA 1
  50 # endif
  51
  52 # ifdef __FP_FAST_FMAF
  53 #  define FP_FAST_FMAF 1
  54 # endif
  55
  56 # ifdef __FP_FAST_FMAL
  57 #  define FP_FAST_FMAL 1
  58 # endif
  59
  60 #endif  /* ISO C99 */