diff options
Diffstat (limited to 'sysdeps/i386/bits/huge_vall.h')
| -rw-r--r-- | sysdeps/i386/bits/huge_vall.h | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/sysdeps/i386/bits/huge_vall.h b/sysdeps/i386/bits/huge_vall.h new file mode 100644 index 0000000000..0678c7cd33 --- /dev/null +++ b/sysdeps/i386/bits/huge_vall.h @@ -0,0 +1,43 @@ +/* `HUGE_VALL' constant for ix86 (where it is infinity). + Used by <stdlib.h> and <math.h> functions for overflow. + Copyright (C) 1992, 1995, 1996, 1997, 1999, 2000, 2004 + 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 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 + Lesser General Public License for more details. + + 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_vall.h> directly; include <math.h> instead." +#endif + +#if __GNUC_PREREQ(3,3) +# define HUGE_VALL (__builtin_huge_vall()) +#elif __GNUC_PREREQ(2,96) +# define HUGE_VALL (__extension__ 0x1.0p32767L) +#else + +# 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__ \ + ((__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. */ + +#endif /* GCC 2.95 */ |