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[/] [or1k/] [trunk/] [linux/] [uClibc/] [libc/] [sysdeps/] [linux/] [m68k/] [bits/] [huge_val.h] - Blame information for rev 1325

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1 1325 phoenix
/* `HUGE_VAL' constants for m68k (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 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_val.h> directly; include <math.h> instead."
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#endif
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#include <features.h>
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#include <sys/cdefs.h>
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/* IEEE positive infinity (-HUGE_VAL is negative infinity).  */
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#ifdef  __GNUC__
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# if __GNUC_PREREQ(2,96)
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#  define HUGE_VAL (__extension__ 0x1.0p2047)
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# else
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#  define HUGE_VAL                                      \
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  (__extension__                                        \
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   ((union { unsigned long long __l; double __d; })     \
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    { __l: 0x7ff0000000000000ULL }).__d)
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# endif
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#else /* not GCC */
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static union { unsigned char __c[8]; double __d; } __huge_val =
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  { { 0x7f, 0xf0, 0, 0, 0, 0, 0, 0 } };
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# define HUGE_VAL       (__huge_val.__d)
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#endif  /* GCC.  */
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/* ISO C 99 extensions: (float) HUGE_VALF and (long double) HUGE_VALL.  */
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#ifdef __USE_ISOC99
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# if __GNUC_PREREQ(2,96)
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#  define HUGE_VALF (__extension__ 0x1.0p255f)
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#  define HUGE_VALL (__extension__ 0x1.0p32767L)
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# else
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#  ifdef __GNUC__
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#   define HUGE_VALF                                    \
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  (__extension__                                        \
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   ((union { unsigned long __l; float __f; })           \
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    { __l: 0x7f800000UL }).__f)
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#   define HUGE_VALL                                    \
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  (__extension__                                        \
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   ((union { unsigned long __l[3]; long double __ld; }) \
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    { __l: { 0x7fff0000UL, 0x80000000UL, 0UL } }).__ld)
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#  else /* not GCC */
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static union { unsigned char __c[4]; float __f; } __huge_valf =
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  { { 0x7f, 0x80, 0, 0 } };
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#   define HUGE_VALF    (__huge_valf.__f)
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static union { unsigned char __c[12]; long double __ld; } __huge_vall =
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  { { 0x7f, 0xff, 0, 0, 0x80, 0, 0, 0, 0, 0, 0, 0 } };
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#   define HUGE_VALL    (__huge_vall.__ld)
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#  endif /* GCC.  */
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# endif /* GCC 2.95.  */
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#endif  /* __USE_ISOC99.  */

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