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01: /* `HUGE_VALF' constant for IEEE 754 machines (where it is infinity). 02: Used by <stdlib.h> and <math.h> functions for overflow. 03: Copyright (C) 1992, 1995, 1996, 1997, 1999, 2000, 2004 04: Free Software Foundation, Inc. 05: This file is part of the GNU C Library. 06: 07: The GNU C Library is free software; you can redistribute it and/or 08: modify it under the terms of the GNU Lesser General Public 09: License as published by the Free Software Foundation; either 10: version 2.1 of the License, or (at your option) any later version. 11: 12: The GNU C Library is distributed in the hope that it will be useful, 13: but WITHOUT ANY WARRANTY; without even the implied warranty of 14: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15: Lesser General Public License for more details. 16: 17: You should have received a copy of the GNU Lesser General Public 18: License along with the GNU C Library; if not, write to the Free 19: Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 20: 02111-1307 USA. */ 21: 22: #ifndef _MATH_H 23: # error "Never use <bits/huge_valf.h> directly; include <math.h> instead." 24: #endif 25: 26: /* IEEE positive infinity (-HUGE_VAL is negative infinity). */ 27: 28: #if __GNUC_PREREQ(3,3) 29: # define HUGE_VALF (__builtin_huge_valf()) 30: #elif __GNUC_PREREQ(2,96) 31: # define HUGE_VALF (__extension__ 0x1.0p255f) 32: #elif defined __GNUC__ 33: 34: # define HUGE_VALF \ 35: (__extension__ \ 36: ((union { unsigned __l __attribute__((__mode__(__SI__))); float __d; }) \ 37: { __l: 0x7f800000UL }).__d) 38: 39: #else /* not GCC */ 40: 41: typedef union { unsigned char __c[4]; float __f; } __huge_valf_t; 42: 43: # if __BYTE_ORDER == __BIG_ENDIAN 44: # define __HUGE_VALF_bytes { 0x7f, 0x80, 0, 0 } 45: # endif 46: # if __BYTE_ORDER == __LITTLE_ENDIAN 47: # define __HUGE_VALF_bytes { 0, 0, 0x80, 0x7f } 48: # endif 49: 50: static __huge_valf_t __huge_valf = { __HUGE_VALF_bytes }; 51: # define HUGE_VALF (__huge_valf.__f) 52: 53: #endif /* GCC. */ 54: