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, 95, 96, 97, 98, 99, 2000 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, write to the Free
19 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
23 # error "Never use <bits/huge_val.h> directly; include <math.h> instead."
28 /* IEEE positive infinity (-HUGE_VAL is negative infinity). */
32 # if __GNUC_PREREQ(2,96)
34 # define HUGE_VAL (__extension__ 0x1.0p2047)
40 ((union { unsigned __l __attribute__((__mode__(__DI__))); double __d; }) \
41 { __l: 0x000000007ff00000ULL }).__d)
49 typedef union { unsigned char __c[8]; double __d; } __huge_val_t;
51 # if __BYTE_ORDER == __BIG_ENDIAN
52 # define __HUGE_VAL_bytes { 0, 0, 0, 0, 0x7f, 0xf0, 0, 0 }
54 # if __BYTE_ORDER == __LITTLE_ENDIAN
55 # define __HUGE_VAL_bytes { 0, 0, 0xf0, 0x7f, 0, 0, 0, 0 }
58 static __huge_val_t __huge_val = { __HUGE_VAL_bytes };
59 # define HUGE_VAL (__huge_val.__d)
64 /* ISO C99 extensions: (float) HUGE_VALF and (long double) HUGE_VALL. */
70 # if __GNUC_PREREQ(2,96)
72 # define HUGE_VALF (__extension__ 0x1.0p255f)
78 ((union { unsigned __l __attribute__((__mode__(__SI__))); float __d; }) \
79 { __l: 0x7f800000UL }).__d)
85 typedef union { unsigned char __c[4]; float __f; } __huge_valf_t;
87 # if __BYTE_ORDER == __BIG_ENDIAN
88 # define __HUGE_VALF_bytes { 0x7f, 0x80, 0, 0 }
90 # if __BYTE_ORDER == __LITTLE_ENDIAN
91 # define __HUGE_VALF_bytes { 0, 0, 0x80, 0x7f }
94 static __huge_valf_t __huge_valf = { __HUGE_VALF_bytes };
95 # define HUGE_VALF (__huge_valf.__f)
100 /* Generally there is no separate `long double' format and it is the
102 # define HUGE_VALL HUGE_VAL
104 #endif /* __USE_ISOC99. */