1    	/* `HUGE_VALF' constant for IEEE 754 machines (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_valf.h> directly; include <math.h> instead."
22   	#endif
23   	
24   	/* IEEE positive infinity (-HUGE_VAL is negative infinity).  */
25   	
26   	#if __GNUC_PREREQ(3,3)
27   	# define HUGE_VALF	(__builtin_huge_valf())
28   	#elif __GNUC_PREREQ(2,96)
29   	# define HUGE_VALF	(__extension__ 0x1.0p255f)
30   	#elif defined __GNUC__
31   	
32   	#   define HUGE_VALF \
33   	  (__extension__							      \
34   	   ((union { unsigned __l __attribute__((__mode__(__SI__))); float __d; })    \
35   	    { __l: 0x7f800000UL }).__d)
36   	
37   	#else /* not GCC */
38   	
39   	typedef union { unsigned char __c[4]; float __f; } __huge_valf_t;
40   	
41   	# if __BYTE_ORDER == __BIG_ENDIAN
42   	#  define __HUGE_VALF_bytes	{ 0x7f, 0x80, 0, 0 }
43   	# endif
44   	# if __BYTE_ORDER == __LITTLE_ENDIAN
45   	#  define __HUGE_VALF_bytes	{ 0, 0, 0x80, 0x7f }
46   	# endif
47   	
48   	static __huge_valf_t __huge_valf = { __HUGE_VALF_bytes };
49   	# define HUGE_VALF	(__huge_valf.__f)
50   	
51   	#endif	/* GCC.  */
52