diff options
Diffstat (limited to 'libc/sysdeps/linux/i386/bits/huge_val.h')
| -rw-r--r-- | libc/sysdeps/linux/i386/bits/huge_val.h | 79 |
1 files changed, 46 insertions, 33 deletions
diff --git a/libc/sysdeps/linux/i386/bits/huge_val.h b/libc/sysdeps/linux/i386/bits/huge_val.h index 23127b403..43f576d8a 100644 --- a/libc/sysdeps/linux/i386/bits/huge_val.h +++ b/libc/sysdeps/linux/i386/bits/huge_val.h @@ -1,22 +1,22 @@ /* `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. + 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. + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 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. + Lesser 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. */ + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; 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." @@ -26,43 +26,56 @@ /* IEEE positive infinity (-HUGE_VAL is negative infinity). */ -#define __HUGE_VAL_bytes { 0, 0, 0, 0, 0, 0, 0xf0, 0x7f } +#if __GNUC_PREREQ(2,96) +# define HUGE_VAL (__extension__ 0x1.0p2047) +#else +# define __HUGE_VAL_bytes { 0, 0, 0, 0, 0, 0, 0xf0, 0x7f } -#define __huge_val_t union { unsigned char __c[8]; double __d; } -#ifdef __GNUC__ -# define HUGE_VAL (__extension__ \ +# 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. */ +# else /* Not GCC. */ static __huge_val_t __huge_val = { __HUGE_VAL_bytes }; -# define HUGE_VAL (__huge_val.__d) -#endif /* GCC. */ +# define HUGE_VAL (__huge_val.__d) +# endif /* GCC. */ +#endif /* GCC 2.95 */ -/* ISO C 9X extensions: (float) HUGE_VALF and (long double) HUGE_VALL. */ +/* ISO C99 extensions: (float) HUGE_VALF and (long double) HUGE_VALL. */ -#ifdef __USE_ISOC9X +#ifdef __USE_ISOC99 -# define __HUGE_VALF_bytes { 0, 0, 0x80, 0x7f } +# if __GNUC_PREREQ(2,96) -# define __huge_valf_t union { unsigned char __c[4]; float __f; } -# ifdef __GNUC__ -# define HUGE_VALF (__extension__ \ +# define HUGE_VALF (__extension__ 0x1.0p255f) +# define HUGE_VALL (__extension__ 0x1.0p32767L) + +# else + +# define __HUGE_VALF_bytes { 0, 0, 0x80, 0x7f } + +# 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. */ +# else /* Not GCC. */ static __huge_valf_t __huge_valf = { __HUGE_VALF_bytes }; -# define HUGE_VALF (__huge_valf.__f) -# endif /* GCC. */ +# define HUGE_VALF (__huge_valf.__f) +# endif /* GCC. */ -# define __HUGE_VALL_bytes { 0, 0, 0, 0, 0, 0, 0, 0x80, 0xff, 0x7f, 0, 0 } +# define __HUGE_VALL_bytes { 0, 0, 0, 0, 0, 0, 0, 0x80, 0xff, 0x7f, 0, 0 } -# define __huge_vall_t union { unsigned char __c[12]; long double __ld; } -# ifdef __GNUC__ -# define HUGE_VALL (__extension__ \ +# 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. */ +# else /* Not GCC. */ static __huge_vall_t __huge_vall = { __HUGE_VALL_bytes }; -# define HUGE_VALL (__huge_vall.__ld) -# endif /* GCC. */ +# define HUGE_VALL (__huge_vall.__ld) +# endif /* GCC. */ + +# endif /* GCC 2.95 */ -#endif /* __USE_ISOC9X. */ +#endif /* __USE_ISOC99. */ |