| /* `HUGE_VALL' constant for IEEE 754 machines (where it is infinity). |
| Used by <stdlib.h> and <math.h> functions for overflow. |
| Copyright (C) 1992-2014 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, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #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()) |
| #else |
| # include <bits/wordsize.h> |
| # if __WORDSIZE == 32 |
| # define HUGE_VALL ((long double) HUGE_VAL) |
| # elif __GNUC_PREREQ(2,96) |
| # define HUGE_VALL (__extension__ 0x1.0p32767L) |
| # elif defined __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 /* GCC 3.3. */ |