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
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
|
/* `NAN' constant for IEEE 754 machines.
Copyright (C) 1992, 1996, 1997 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#ifndef _NAN_H
#define _NAN_H 1
/* IEEE Not A Number. */
#ifdef __GNUC__
#define NAN \
(__extension__ \
((union { unsigned __l __attribute__((__mode__(__DI__))); double __d; }) \
{ __l: 0x7ff8000000000000ULL }).__d)
#define NANF \
(__extension__ \
((union { unsigned __l __attribute__((__mode__(__SI__))); float __d; }) \
{ __l: 0x7fc00000UL }).__d)
#else
#include <endian.h>
#if __BYTE_ORDER == __BIG_ENDIAN
#define __nan_bytes { 0x7f, 0xf8, 0, 0, 0, 0, 0, 0 }
#define __nanf_bytes { 0x7f, 0xc0, 0, 0 }
#endif
#if __BYTE_ORDER == __LITTLE_ENDIAN
#define __nan_bytes { 0, 0, 0, 0, 0, 0, 0xf8, 0x7f }
#define __nanf_bytes { 0, 0, 0xc0, 0x7f }
#endif
static union { unsigned char __c[8]; double __d; } __nan = { __nan_bytes };
#define NAN (__nan.__d)
static union { unsigned char __c[4]; double __d; } __nanf = { __nanf_bytes };
#define NANF (__nanf.__d)
#endif /* GCC. */
/* Generally there is no separate `long double' format and it is the
same as `double'. */
#define NANL NAN
#endif /* nan.h */
|
