1 /* `HUGE_VALL' constant for ix86 (where it is infinity). 2 Used by <stdlib.h> and <math.h> functions for overflow. 3 Copyright (C) 1992-2015 Free Software Foundation, Inc. 4 This file is part of the GNU C Library. 5 6 The GNU C Library is free software; you can redistribute it and/or 7 modify it under the terms of the GNU Lesser General Public 8 License as published by the Free Software Foundation; either 9 version 2.1 of the License, or (at your option) any later version. 10 11 The GNU C Library is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 Lesser General Public License for more details. 15 16 You should have received a copy of the GNU Lesser General Public 17 License along with the GNU C Library; if not, see 18 <http://www.gnu.org/licenses/>. */ 19 20 #ifndef _MATH_H 21 # error "Never use <bits/huge_vall.h> directly; include <math.h> instead." 22 #endif 23 24 #if __GNUC_PREREQ(3,3) 25 # define HUGE_VALL (__builtin_huge_vall()) 26 #elif __GNUC_PREREQ(2,96) 27 # define HUGE_VALL (__extension__ 0x1.0p32767L) 28 #else 29 30 # define __HUGE_VALL_bytes { 0, 0, 0, 0, 0, 0, 0, 0x80, 0xff, 0x7f, 0, 0 } 31 32 # define __huge_vall_t union { unsigned char __c[12]; long double __ld; } 33 # ifdef __GNUC__ 34 # define HUGE_VALL (__extension__ \ 35 ((__huge_vall_t) { __c: __HUGE_VALL_bytes }).__ld) 36 # else /* Not GCC. */ 37 static __huge_vall_t __huge_vall = { __HUGE_VALL_bytes }; 38 # define HUGE_VALL (__huge_vall.__ld) 39 # endif /* GCC. */ 40 41 #endif /* GCC 2.95 */ 42