1 /* `HUGE_VAL' constants for ix86 (where it is infinity). 2 Used by <stdlib.h> and <math.h> functions for overflow. 3 Copyright (C) 1992, 1995, 1996, 1997, 1999, 2000 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, write to the Free 18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 19 02111-1307 USA. */ 20 21 #include <features.h> 22 23 /* ISO C99 extensions: (float) HUGE_VALF and (long double) HUGE_VALL. */ 24 25 # if __GNUC_PREREQ(2,96) 26 27 # define HUGE_VALF (__extension__ 0x1.0p255f) 28 # define HUGE_VALL (__extension__ 0x1.0p32767L) 29 30 # else 31 32 # define __HUGE_VALF_bytes { 0, 0, 0x80, 0x7f } 33 34 # define __huge_valf_t union { unsigned char __c[4]; float __f; } 35 # ifdef __GNUC__ 36 # define HUGE_VALF (__extension__ \ 37 ((__huge_valf_t) { __c: __HUGE_VALF_bytes }).__f) 38 # else /* Not GCC. */ 39 static __huge_valf_t __huge_valf = { __HUGE_VALF_bytes }; 40 # define HUGE_VALF (__huge_valf.__f) 41 # endif /* GCC. */ 42 43 44 # define __HUGE_VALL_bytes { 0, 0, 0, 0, 0, 0, 0, 0x80, 0xff, 0x7f, 0, 0 } 45 46 # define __huge_vall_t union { unsigned char __c[12]; long double __ld; } 47 # ifdef __GNUC__ 48 # define HUGE_VALL (__extension__ \ 49 ((__huge_vall_t) { __c: __HUGE_VALL_bytes }).__ld) 50 # else /* Not GCC. */ 51 static __huge_vall_t __huge_vall = { __HUGE_VALL_bytes }; 52 # define HUGE_VALL (__huge_vall.__ld) 53 # endif /* GCC. */ 54 55 # endif /* GCC 2.95 */ 56 57