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- /* `HUGE_VALF' constant for IEEE 754 machines (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, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
- #ifndef _MATH_H
- # error "Never use <bits/huge_valf.h> directly; include <math.h> instead."
- #endif
- /* IEEE positive infinity (-HUGE_VAL is negative infinity). */
- #if __GNUC_PREREQ(3,3)
- # define HUGE_VALF (__builtin_huge_valf())
- #elif __GNUC_PREREQ(2,96)
- # define HUGE_VALF (__extension__ 0x1.0p255f)
- #elif defined __GNUC__
- # define HUGE_VALF \
- (__extension__ \
- ((union { unsigned __l __attribute__((__mode__(__SI__))); float __d; }) \
- { __l: 0x7f800000UL }).__d)
- #else /* not GCC */
- typedef union { unsigned char __c[4]; float __f; } __huge_valf_t;
- # if __BYTE_ORDER == __BIG_ENDIAN
- # define __HUGE_VALF_bytes { 0x7f, 0x80, 0, 0 }
- # endif
- # if __BYTE_ORDER == __LITTLE_ENDIAN
- # define __HUGE_VALF_bytes { 0, 0, 0x80, 0x7f }
- # endif
- static __huge_valf_t __huge_valf = { __HUGE_VALF_bytes };
- # define HUGE_VALF (__huge_valf.__f)
- #endif /* GCC. */
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