sysdeps/i386/bits/mathdef.h

   1 /* Copyright (C) 1997, 1998, 1999, 2000, 2004, 2010 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 __FLT_EVAL_METHOD__ && __FLT_EVAL_METHOD__ == 0
  26 /* When using -mfpmath=sse, values are computed with the precission of the
  27    used type.  */
  28 typedef float float_t;          /* `float' expressions are evaluated as `float'.  */
  29 typedef double double_t;        /* `double' expressions are evaluated as
  30                                    `double'.  */
  31 # else
  32 /* The ix87 FPUs evaluate all values in the 80 bit floating-point format
  33    which is also available for the user as `long double'.  Therefore we
  34    define:  */
  35 typedef long double float_t;    /* `float' expressions are evaluated as
  36                                    `long double'.  */
  37 typedef long double double_t;   /* `double' expressions are evaluated as
  38                                    `long double'.  */
  39 # endif
  40
  41 /* The values returned by `ilogb' for 0 and NaN respectively.  */
  42 # define FP_ILOGB0      (-2147483647 - 1)
  43 # define FP_ILOGBNAN    (-2147483647 - 1)
  44
  45 /* The GCC 4.6 compiler will define __FP_FAST_FMA{,F,L} if the fma{,f,l}
  46    builtins are supported.  */
  47 # if __FP_FAST_FMA
  48 #  define FP_FAST_FMA 1
  49 # endif
  50
  51 # if __FP_FAST_FMAF
  52 #  define FP_FAST_FMAF 1
  53 # endif
  54
  55 # if __FP_FAST_FMAL
  56 #  define FP_FAST_FMAL 1
  57 # endif
  58
  59 #endif  /* ISO C99 */