sysdeps/sparc/bits/huge_vall.h

   1 /* `HUGE_VALL' constant for IEEE 754 machines (where it is infinity).
   2    Used by <stdlib.h> and <math.h> functions for overflow.
   3    Copyright (C) 1992-2014 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef _MATH_H
  21 # error "Never use <bits/huge_vall.h> directly; include <math.h> instead."
  22 #endif
  23
  24 #if __GNUC_PREREQ(3,3)
  25 # define HUGE_VALL      (__builtin_huge_vall())
  26 #else
  27 # include <bits/wordsize.h>
  28 # if __WORDSIZE == 32
  29 #  define HUGE_VALL     ((long double) HUGE_VAL)
  30 # elif __GNUC_PREREQ(2,96)
  31 #   define HUGE_VALL    (__extension__ 0x1.0p32767L)
  32 # elif defined __GNUC__
  33
  34 #   define HUGE_VALL \
  35   (__extension__                                                         \
  36    ((union { struct { unsigned long __h, __l; } __i; long double __d; }) \
  37     { __i: { __h: 0x7fff000000000000UL, __l: 0 } }).__d)
  38
  39 # else /* not GCC */
  40
  41 typedef union { unsigned char __c[16]; long double __d; } __huge_vall_t;
  42 #  define __HUGE_VALL_bytes     { 0x7f, 0xff, 0,0,0,0,0,0,0,0,0,0,0,0,0,0 }
  43 static __huge_vall_t __huge_vall = { __HUGE_VALL_bytes };
  44 #  define HUGE_VALL     (__huge_vall.__d)
  45
  46 # endif /* GCC.  */
  47 #endif /* GCC 3.3.  */