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3846ef75 UD |
1 | /* `HUGE_VAL' constants for IEEE 754 machines (where it is infinity). |
2 | Used by <stdlib.h> and <math.h> functions for overflow. | |
3 | SH version. | |
d4697bc9 | 4 | Copyright (C) 1992-2014 Free Software Foundation, Inc. |
3846ef75 UD |
5 | This file is part of the GNU C Library. |
6 | ||
7 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
8 | modify it under the terms of the GNU Lesser General Public |
9 | License as published by the Free Software Foundation; either | |
10 | version 2.1 of the License, or (at your option) any later version. | |
3846ef75 UD |
11 | |
12 | The GNU C Library is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 15 | Lesser General Public License for more details. |
3846ef75 | 16 | |
41bdb6e2 | 17 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
18 | License along with the GNU C Library; if not, see |
19 | <http://www.gnu.org/licenses/>. */ | |
3846ef75 UD |
20 | |
21 | #ifndef _MATH_H | |
22 | # error "Never use <bits/huge_val.h> directly; include <math.h> instead." | |
23 | #endif | |
24 | ||
3846ef75 UD |
25 | /* IEEE positive infinity (-HUGE_VAL is negative infinity). */ |
26 | ||
a86573f4 RH |
27 | #if __GNUC_PREREQ(3,3) |
28 | # define HUGE_VAL (__builtin_huge_val()) | |
29 | #elif __GNUC_PREREQ(2,96) | |
30 | # define HUGE_VAL (__extension__ 0x1.0p2047) | |
31 | #elif defined __GNUC__ | |
3846ef75 UD |
32 | |
33 | # define HUGE_VAL \ | |
34 | (__extension__ \ | |
35 | ((union { unsigned __l __attribute__((__mode__(__DI__))); double __d; }) \ | |
36 | { __l: 0x000000007ff00000ULL }).__d) | |
37 | ||
3846ef75 UD |
38 | #else /* not GCC */ |
39 | ||
40 | # include <endian.h> | |
41 | ||
42 | typedef union { unsigned char __c[8]; double __d; } __huge_val_t; | |
43 | ||
44 | # if __BYTE_ORDER == __BIG_ENDIAN | |
45 | # define __HUGE_VAL_bytes { 0, 0, 0, 0, 0x7f, 0xf0, 0, 0 } | |
46 | # endif | |
47 | # if __BYTE_ORDER == __LITTLE_ENDIAN | |
48 | # define __HUGE_VAL_bytes { 0, 0, 0xf0, 0x7f, 0, 0, 0, 0 } | |
49 | # endif | |
50 | ||
51 | static __huge_val_t __huge_val = { __HUGE_VAL_bytes }; | |
52 | # define HUGE_VAL (__huge_val.__d) | |
53 | ||
54 | #endif /* GCC. */ |