mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-26 20:51:11 +00:00
76 lines
2.3 KiB
C
76 lines
2.3 KiB
C
/* `HUGE_VAL' constants for m68k (where it is infinity).
|
|
Used by <stdlib.h> and <math.h> functions for overflow.
|
|
Copyright (C) 1992, 1995, 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 _HUGE_VAL_H
|
|
#define _HUGE_VAL_H 1
|
|
|
|
#include <features.h>
|
|
#include <sys/cdefs.h>
|
|
|
|
/* IEEE positive infinity (-HUGE_VAL is negative infinity). */
|
|
|
|
#ifdef __GNUC__
|
|
|
|
#define HUGE_VAL \
|
|
(__extension__ \
|
|
((union { unsigned long long __l; double __d; }) \
|
|
{ __l: 0x7ff0000000000000ULL }).__d)
|
|
|
|
#else /* not GCC */
|
|
|
|
static union { unsigned char __c[8]; double __d; } __huge_val =
|
|
{ { 0x7f, 0xf0, 0, 0, 0, 0, 0, 0 } };
|
|
#define HUGE_VAL (__huge_val.__d)
|
|
|
|
#endif /* GCC. */
|
|
|
|
|
|
/* ISO C 9X extensions: (float) HUGE_VALF and (long double) HUGE_VALL. */
|
|
|
|
#ifdef __USE_ISOC9X
|
|
|
|
#ifdef __GNUC__
|
|
|
|
#define HUGE_VALF \
|
|
(__extension__ \
|
|
((union { unsigned long __l; float __f; }) \
|
|
{ __l: 0x7f800000UL }).__f)
|
|
|
|
#define HUGE_VALL \
|
|
(__extension__ \
|
|
((union { unsigned long __l[3]; long double __ld; }) \
|
|
{ __l: { 0x7fff0000UL, 0x80000000UL, 0UL } }).__ld)
|
|
|
|
#else /* not GCC */
|
|
|
|
static union { unsigned char __c[4]; float __f; } __huge_valf =
|
|
{ { 0x7f, 0x80, 0, 0 } };
|
|
#define HUGE_VALF (__huge_valf.__f)
|
|
|
|
static union { unsigned char __c[12]; long double __ld; } __huge_vall =
|
|
{ { 0x7f, 0xff, 0, 0, 0x80, 0, 0, 0, 0, 0, 0, 0 } };
|
|
#define HUGE_VALL (__huge_vall.__ld)
|
|
|
|
#endif /* GCC. */
|
|
|
|
#endif /* __USE_ISOC9X. */
|
|
|
|
#endif /* huge_val.h */
|