1 /* `HUGE_VALL' constant for IEEE 754 machines (where it is infinity).
2 Used by <stdlib.h> and <math.h> functions for overflow.
3 Copyright (C) 1992, 1995, 1996, 1997, 1999, 2000, 2004
4 Free Software Foundation, Inc.
5 This file is part of the GNU C Library.
7 The GNU C Library is free software; you can redistribute it and/or
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.
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
15 Lesser General Public License for more details.
17 You should have received a copy of the GNU Lesser General Public
18 License along with the GNU C Library; if not, see
19 <http://www.gnu.org/licenses/>. */
22 # error "Never use <bits/huge_vall.h> directly; include <math.h> instead."
25 /* IEEE positive infinity (-HUGE_VAL is negative infinity). */
27 #if __GNUC_PREREQ(3,3)
28 # define HUGE_VALL (__builtin_huge_vall())
29 #elif __GNUC_PREREQ(2,96)
30 # define HUGE_VALL (__extension__ 0x1.0p32767L)
34 typedef union { unsigned char __c
[16]; long double __ld
; } __huge_vall_t
;
36 # if __BYTE_ORDER == __BIG_ENDIAN
37 # define __HUGE_VALL_bytes { 0x7f, 0xff, 0,0,0,0,0,0,0,0,0,0,0,0,0,0 }
39 # if __BYTE_ORDER == __LITTLE_ENDIAN
40 # define __HUGE_VALL_bytes { 0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0xff, 0x7f }
44 # define HUGE_VALL (__extension__ \
45 ((__huge_vall_t) { __c : __HUGE_VALL_bytes }).__ld)
47 static __huge_vall_t __huge_vall
= { __HUGE_VALL_bytes
};
48 # define HUGE_VALL (__huge_vall.__ld)