mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-23 21:40:12 +00:00
85153f6c4c
2000-05-21 Jakub Jelinek <jakub@redhat.com> * sysdeps/arm/bits/huge_val.h: Prereq gcc 2.96+, not 2.95. * sysdeps/i386/bits/huge_val.h: Likewise. * sysdeps/ieee754/bits/huge_val.h: Likewise. * sysdeps/m68k/bits/huge_val.h: Likewise. * sysdeps/sparc/sparc32/bits/huge_val.h: Likewise. * sysdeps/sparc/sparc64/bits/huge_val.h: Likewise.
123 lines
3.2 KiB
C
123 lines
3.2 KiB
C
/* `HUGE_VAL' constants for IEEE 754 machines (where it is infinity).
|
|
Used by <stdlib.h> and <math.h> functions for overflow.
|
|
Copyright (C) 1992, 1995, 1996, 1997, 1999, 2000 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 _MATH_H
|
|
# error "Never use <bits/huge_val.h> directly; include <math.h> instead."
|
|
#endif
|
|
|
|
#include <features.h>
|
|
#include <bits/wordsize.h>
|
|
|
|
/* IEEE positive infinity (-HUGE_VAL is negative infinity). */
|
|
|
|
#ifdef __GNUC__
|
|
|
|
# if __GNUC_PREREQ(2,96)
|
|
|
|
# define HUGE_VAL (__extension__ 0x1.0p2047)
|
|
|
|
# else
|
|
|
|
# define HUGE_VAL \
|
|
(__extension__ \
|
|
((union { unsigned __l __attribute__((__mode__(__DI__))); double __d; }) \
|
|
{ __l: 0x7ff0000000000000ULL }).__d)
|
|
|
|
# endif
|
|
|
|
#else /* not GCC */
|
|
|
|
typedef union { unsigned char __c[8]; double __d; } __huge_val_t;
|
|
|
|
# define __HUGE_VAL_bytes { 0x7f, 0xf0, 0, 0, 0, 0, 0, 0 }
|
|
|
|
static __huge_val_t __huge_val = { __HUGE_VAL_bytes };
|
|
# define HUGE_VAL (__huge_val.__d)
|
|
|
|
#endif /* GCC. */
|
|
|
|
|
|
/* ISO C99 extensions: (float) HUGE_VALF and (long double) HUGE_VALL. */
|
|
|
|
#ifdef __USE_ISOC99
|
|
|
|
# if __GNUC_PREREQ(2,96)
|
|
|
|
# define HUGE_VALF (__extension__ 0x1.0p255f)
|
|
# if __WORDSIZE == 32
|
|
# define HUGE_VALL HUGE_VAL
|
|
# else
|
|
/* Sparc64 uses IEEE 754 128bit long double */
|
|
# define HUGE_VALL (__extension__ 0x1.0p32767L)
|
|
# endif
|
|
|
|
# else
|
|
|
|
# ifdef __GNUC__
|
|
|
|
# define HUGE_VALF \
|
|
(__extension__ \
|
|
((union { unsigned __l __attribute__((__mode__(__SI__))); float __d; }) \
|
|
{ __l: 0x7f800000UL }).__d)
|
|
|
|
# else /* not GCC */
|
|
|
|
typedef union { unsigned char __c[4]; float __f; } __huge_valf_t;
|
|
|
|
# define __HUGE_VALF_bytes { 0x7f, 0x80, 0, 0 }
|
|
|
|
static __huge_valf_t __huge_valf = { __HUGE_VALF_bytes };
|
|
# define HUGE_VALF (__huge_valf.__f)
|
|
|
|
# endif /* GCC. */
|
|
|
|
# if __WORDSIZE == 32
|
|
|
|
/* Sparc32 has IEEE 754 64bit long double */
|
|
# define HUGE_VALL HUGE_VAL
|
|
|
|
# else
|
|
|
|
/* Sparc64 uses IEEE 754 128bit long double */
|
|
|
|
# ifdef __GNUC__
|
|
|
|
# define HUGE_VALL \
|
|
(__extension__ \
|
|
((union { struct { unsigned long __h, __l; } __i; long double __d; }) \
|
|
{ __i: { __h: 0x7fff000000000000UL, __l: 0 } }).__d)
|
|
|
|
# else /* not GCC */
|
|
|
|
typedef union { unsigned char __c[16]; long double __d; } __huge_vall_t;
|
|
|
|
# define __HUGE_VALL_bytes { 0x7f, 0xff, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
|
|
|
|
static __huge_vall_t __huge_vall = { __HUGE_VALL_bytes };
|
|
# define HUGE_VALL (__huge_vall.__d)
|
|
|
|
# endif /* GCC. */
|
|
|
|
# endif
|
|
|
|
# endif /* GCC 2.95. */
|
|
|
|
#endif /* __USE_ISOC99. */
|