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/* `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, 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()) #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 */