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: /usr/include/bits/

files >> /usr/include/bits/huge_vall.h

 /* `HUGE_VALL' constant for ix86 (where it is infinity).
   Used by <stdlib.h> and <math.h> functions for overflow.
   Copyright (C) 1992, 1995, 1996, 1997, 1999, 2000, 2004
   Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#ifndef _MATH_H
# error "Never use <bits/huge_vall.h> directly; include <math.h> instead."
#endif

#if __GNUC_PREREQ(3,3)
# define HUGE_VALL	(__builtin_huge_vall())
#elif __GNUC_PREREQ(2,96)
# define HUGE_VALL	(__extension__ 0x1.0p32767L)
#else

# define __HUGE_VALL_bytes	{ 0, 0, 0, 0, 0, 0, 0, 0x80, 0xff, 0x7f, 0, 0 }

# define __huge_vall_t	union { unsigned char __c[12]; long double __ld; }
# ifdef __GNUC__
#  define HUGE_VALL	(__extension__ \
			 ((__huge_vall_t) { __c: __HUGE_VALL_bytes }).__ld)
# else	/* Not GCC.  */
static __huge_vall_t __huge_vall = { __HUGE_VALL_bytes };
#  define HUGE_VALL	(__huge_vall.__ld)
#  endif /* GCC.  */

#endif /* GCC 2.95 */

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