1/* `HUGE_VAL' constants for ix86 (where it is infinity).
2   Used by <stdlib.h> and <math.h> functions for overflow.
3   Copyright (C) 1992, 1995, 1996, 1997, 1999, 2000 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, write to the Free
18   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
19   02111-1307 USA.  */
20
21#ifndef _MATH_H
22# error "Never use <bits/huge_val.h> directly; include <math.h> instead."
23#endif
24
25#include <features.h>
26
27/* IEEE positive infinity (-HUGE_VAL is negative infinity).  */
28
29#if __GNUC_PREREQ(2,96)
30# define HUGE_VAL	(__extension__ 0x1.0p2047)
31#else
32# define __HUGE_VAL_bytes	{ 0, 0, 0, 0, 0, 0, 0xf0, 0x7f }
33
34# define __huge_val_t	union { unsigned char __c[8]; double __d; }
35# ifdef	__GNUC__
36#  define HUGE_VAL	(__extension__ \
37			 ((__huge_val_t) { __c: __HUGE_VAL_bytes }).__d)
38# else	/* Not GCC.  */
39static __huge_val_t __huge_val = { __HUGE_VAL_bytes };
40#  define HUGE_VAL	(__huge_val.__d)
41# endif	/* GCC.  */
42#endif /* GCC 2.95 */
43
44
45/* ISO C99 extensions: (float) HUGE_VALF and (long double) HUGE_VALL.  */
46
47#ifdef __USE_ISOC99
48
49# if __GNUC_PREREQ(2,96)
50
51#  define HUGE_VALF (__extension__ 0x1.0p255f)
52#  define HUGE_VALL (__extension__ 0x1.0p32767L)
53
54# else
55
56#  define __HUGE_VALF_bytes	{ 0, 0, 0x80, 0x7f }
57
58#  define __huge_valf_t	union { unsigned char __c[4]; float __f; }
59#  ifdef	__GNUC__
60#   define HUGE_VALF	(__extension__ \
61			 ((__huge_valf_t) { __c: __HUGE_VALF_bytes }).__f)
62#  else	/* Not GCC.  */
63static __huge_valf_t __huge_valf = { __HUGE_VALF_bytes };
64#   define HUGE_VALF	(__huge_valf.__f)
65#  endif	/* GCC.  */
66
67
68#  define __HUGE_VALL_bytes	{ 0, 0, 0, 0, 0, 0, 0, 0x80, 0xff, 0x7f, 0, 0 }
69
70#  define __huge_vall_t	union { unsigned char __c[12]; long double __ld; }
71#  ifdef __GNUC__
72#   define HUGE_VALL	(__extension__ \
73			 ((__huge_vall_t) { __c: __HUGE_VALL_bytes }).__ld)
74#  else	/* Not GCC.  */
75static __huge_vall_t __huge_vall = { __HUGE_VALL_bytes };
76#   define HUGE_VALL	(__huge_vall.__ld)
77#  endif /* GCC.  */
78
79# endif /* GCC 2.95 */
80
81#endif	/* __USE_ISOC99.  */
82