1 /* `HUGE_VAL' constants for IEEE 754 machines (where it is infinity).
2 Used by <stdlib.h> and <math.h> functions for overflow.
4 Copyright (C) 1992, 1995, 1996, 1997, 1998, 1999, 2000
5 Free Software Foundation, Inc.
6 This file is part of the GNU C Library.
8 The GNU C Library is free software; you can redistribute it and/or
9 modify it under the terms of the GNU Lesser General Public
10 License as published by the Free Software Foundation; either
11 version 2.1 of the License, or (at your option) any later version.
13 The GNU C Library is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public
19 License along with the GNU C Library; if not, write to the Free
20 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
24 # error "Never use <bits/huge_val.h> directly; include <math.h> instead."
29 /* IEEE positive infinity (-HUGE_VAL is negative infinity). */
33 # if __GNUC_PREREQ(2,95)
35 # define HUGE_VAL (0x1.0p2047)
41 ((union { unsigned __l __attribute__((__mode__(__DI__))); double __d; }) \
42 { __l: 0x000000007ff00000ULL }).__d)
50 typedef union { unsigned char __c[8]; double __d; } __huge_val_t;
52 # if __BYTE_ORDER == __BIG_ENDIAN
53 # define __HUGE_VAL_bytes { 0, 0, 0, 0, 0x7f, 0xf0, 0, 0 }
55 # if __BYTE_ORDER == __LITTLE_ENDIAN
56 # define __HUGE_VAL_bytes { 0, 0, 0xf0, 0x7f, 0, 0, 0, 0 }
59 static __huge_val_t __huge_val = { __HUGE_VAL_bytes };
60 # define HUGE_VAL (__huge_val.__d)
65 /* ISO C99 extensions: (float) HUGE_VALF and (long double) HUGE_VALL. */
71 # if __GNUC_PREREQ(2,95)
73 # define HUGE_VALF (0x1.0p255f)
79 ((union { unsigned __l __attribute__((__mode__(__SI__))); float __d; }) \
80 { __l: 0x7f800000UL }).__d)
86 typedef union { unsigned char __c[4]; float __f; } __huge_valf_t;
88 # if __BYTE_ORDER == __BIG_ENDIAN
89 # define __HUGE_VALF_bytes { 0x7f, 0x80, 0, 0 }
91 # if __BYTE_ORDER == __LITTLE_ENDIAN
92 # define __HUGE_VALF_bytes { 0, 0, 0x80, 0x7f }
95 static __huge_valf_t __huge_valf = { __HUGE_VALF_bytes };
96 # define HUGE_VALF (__huge_valf.__f)
101 /* Generally there is no separate `long double' format and it is the
103 # define HUGE_VALL HUGE_VAL
105 #endif /* __USE_ISOC99. */