1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
/* `HUGE_VALL' constant for IEEE 754 machines (where it is infinity).
Used by <stdlib.h> and <math.h> functions for overflow.
Copyright (C) 1992-2016 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())
#else
# include <bits/wordsize.h>
# if __WORDSIZE == 32
# define HUGE_VALL ((long double) HUGE_VAL)
# elif __GNUC_PREREQ(2,96)
# define HUGE_VALL (__extension__ 0x1.0p32767L)
# elif defined __GNUC__
# define HUGE_VALL \
(__extension__ \
((union { struct { unsigned long __h, __l; } __i; long double __d; }) \
{ __i: { __h: 0x7fff000000000000UL, __l: 0 } }).__d)
# else /* not GCC */
typedef union { unsigned char __c[16]; long double __d; } __huge_vall_t;
# define __HUGE_VALL_bytes { 0x7f, 0xff, 0,0,0,0,0,0,0,0,0,0,0,0,0,0 }
static __huge_vall_t __huge_vall = { __HUGE_VALL_bytes };
# define HUGE_VALL (__huge_vall.__d)
# endif /* GCC. */
#endif /* GCC 3.3. */
|
