/* `HUGE_VALL' constant for ix86 (where it is infinity). Used by and 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 . */ #ifndef _MATH_H # error "Never use directly; include 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 */