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50 lines
1.8 KiB
C
50 lines
1.8 KiB
C
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/* `HUGE_VALL' constant for IEEE 754 machines (where it is infinity).
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Used by <stdlib.h> and <math.h> functions for overflow.
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Copyright (C) 1992, 1995, 1996, 1997, 1999, 2000, 2004
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Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#ifndef _MATH_H
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# error "Never use <bits/huge_vall.h> directly; include <math.h> instead."
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#endif
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#if __GNUC_PREREQ(3,3)
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# define HUGE_VALL (__builtin_huge_vall())
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#else
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# include <bits/wordsize.h>
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# if __WORDSIZE == 32
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# define HUGE_VALL ((long double) HUGE_VAL)
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# elif __GNUC_PREREQ(2,96)
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# define HUGE_VALL (__extension__ 0x1.0p32767L)
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# elif defined __GNUC__
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# define HUGE_VALL \
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(__extension__ \
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((union { struct { unsigned long __h, __l; } __i; long double __d; }) \
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{ __i: { __h: 0x7fff000000000000UL, __l: 0 } }).__d)
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# else /* not GCC */
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typedef union { unsigned char __c[16]; long double __d; } __huge_vall_t;
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# define __HUGE_VALL_bytes { 0x7f, 0xff, 0,0,0,0,0,0,0,0,0,0,0,0,0,0 }
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static __huge_vall_t __huge_vall = { __HUGE_VALL_bytes };
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# define HUGE_VALL (__huge_vall.__d)
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# endif /* GCC. */
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#endif /* GCC 3.3. */
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