sysdeps/x86_64/bits/mathdef.h

   1 /* Copyright (C) 2001, 2004 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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #if !defined _MATH_H && !defined _COMPLEX_H
  20 # error "Never use <bits/mathdef.h> directly; include <math.h> instead"
  21 #endif
  22
  23 #if defined __USE_ISOC99 && defined _MATH_H && !defined _MATH_H_MATHDEF
  24 # define _MATH_H_MATHDEF        1
  25
  26 # include <bits/wordsize.h>
  27
  28 # if __WORDSIZE == 64 || (defined __FLT_EVAL_METHOD__ && __FLT_EVAL_METHOD__ == 0)
  29 /* The x86-64 architecture computes values with the precission of the
  30    used type.  Similarly for -m32 -mfpmath=sse.  */
  31 typedef float float_t;          /* `float' expressions are evaluated as `float'.  */
  32 typedef double double_t;        /* `double' expressions are evaluated
  33                                    as `double'.  */
  34 # else
  35 /* The ix87 FPUs evaluate all values in the 80 bit floating-point format
  36    which is also available for the user as `long double'.  Therefore we
  37    define:  */
  38 typedef long double float_t;    /* `float' expressions are evaluated as
  39                                    `long double'.  */
  40 typedef long double double_t;   /* `double' expressions are evaluated as
  41                                    `long double'.  */
  42 # endif
  43
  44 /* The values returned by `ilogb' for 0 and NaN respectively.  */
  45 # define FP_ILOGB0      (-2147483647 - 1)
  46 # define FP_ILOGBNAN    (-2147483647 - 1)
  47
  48 #endif  /* ISO C99 */