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Diffstat (limited to 'sysdeps/i386/huge_val.h')
| -rw-r--r-- | sysdeps/i386/huge_val.h | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/sysdeps/i386/huge_val.h b/sysdeps/i386/huge_val.h new file mode 100644 index 0000000000..8af745f6c1 --- /dev/null +++ b/sysdeps/i386/huge_val.h @@ -0,0 +1,92 @@ +/* `HUGE_VAL' constants for ix86 (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> +#include <endian.h> + +/* IEEE positive infinity (-HUGE_VAL is negative infinity). */ + +#if __BYTE_ORDER == __BIG_ENDIAN +#define __HUGE_VAL_bytes { 0x7f, 0xf0, 0, 0, 0, 0, 0, 0 } +#endif +#if __BYTE_ORDER == __LITTLE_ENDIAN +#define __HUGE_VAL_bytes { 0, 0, 0, 0, 0, 0, 0xf0, 0x7f } +#endif + +#define __huge_val_t union { unsigned char __c[8]; double __d; } +#ifdef __GNUC__ +#define HUGE_VAL (__extension__ \ + ((__huge_val_t) { __c: __HUGE_VAL_bytes }).__d) +#else /* Not GCC. */ +static __huge_val_t __huge_val = { __HUGE_VAL_bytes }; +#define HUGE_VAL (__huge_val.__d) +#endif /* GCC. */ + + +/* ISO C 9X extensions: (float) HUGE_VALF and (long double) HUGE_VALL. */ + +#ifdef __USE_ISOC9X + +#if __BYTE_ORDER == __BIG_ENDIAN +#define __HUGE_VALF_bytes { 0x7f, 0x80, 0, 0 } +#endif +#if __BYTE_ORDER == __LITTLE_ENDIAN +#define __HUGE_VALF_bytes { 0, 0, 0x80, 0x7f } +#endif + +#define __huge_valf_t union { unsigned char __c[4]; float __f; } +#ifdef __GNUC__ +#define HUGE_VALF (__extension__ \ + ((__huge_valf_t) { __c: __HUGE_VALF_bytes }).__f) +#else /* Not GCC. */ +static __huge_valf_t __huge_valf = { __HUGE_VALF_bytes }; +#define HUGE_VALF (__huge_valf.__f) +#endif /* GCC. */ + + +#if __BYTE_ORDER == __BIG_ENDIAN +#define __HUGE_VALL_bytes { 0x7f, 0xff, 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0 } +#endif +#if __BYTE_ORDER == __LITTLE_ENDIAN +#define __HUGE_VALL_bytes { 0, 0, 0, 0, 0, 0, 0, 0x80, 0xff, 0x7f, 0, 0 } +#endif + +#define __huge_vall_t union { unsigned char __c[12]; long double __ld; } +#ifdef __GNUC__ +#define HUGE_VALL (__extension__ \ + ((__huge_vall_t) { __c: __HUGE_VALL_bytes }).__ld) +#else /* Not GCC. */ +static __huge_vall_t __huge_vall = { __HUGE_VALL_bytes }; +#define HUGE_VALL (__huge_vall.__ld) +#endif /* GCC. */ + + +/* Expression representing positive infinity. Here it is the same as + HUGE_VALF. */ +#define INFINITY HUGE_VALF + +#endif /* __USE_ISOC9X. */ + + +#endif /* huge_val.h */ |