1    	/* `HUGE_VALL' constant for ix86 (where it is infinity).
2    	   Used by <stdlib.h> and <math.h> functions for overflow.
3    	   Copyright (C) 1992-2015 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   	#elif __GNUC_PREREQ(2,96)
27   	# define HUGE_VALL	(__extension__ 0x1.0p32767L)
28   	#else
29   	
30   	# define __HUGE_VALL_bytes	{ 0, 0, 0, 0, 0, 0, 0, 0x80, 0xff, 0x7f, 0, 0 }
31   	
32   	# define __huge_vall_t	union { unsigned char __c[12]; long double __ld; }
33   	# ifdef __GNUC__
34   	#  define HUGE_VALL	(__extension__ \
35   				 ((__huge_vall_t) { __c: __HUGE_VALL_bytes }).__ld)
36   	# else	/* Not GCC.  */
37   	static __huge_vall_t __huge_vall = { __HUGE_VALL_bytes };
38   	#  define HUGE_VALL	(__huge_vall.__ld)
39   	#  endif /* GCC.  */
40   	
41   	#endif /* GCC 2.95 */
42