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41bdb6e20c
2001-07-06 Paul Eggert <eggert@twinsun.com> * manual/argp.texi: Remove ignored LGPL copyright notice; it's not appropriate for documentation anyway. * manual/libc-texinfo.sh: "Library General Public License" -> "Lesser General Public License". 2001-07-06 Andreas Jaeger <aj@suse.de> * All files under GPL/LGPL version 2: Place under LGPL version 2.1.
82 lines
2.6 KiB
C
82 lines
2.6 KiB
C
/* `HUGE_VAL' constants for ix86 (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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/* IEEE positive infinity (-HUGE_VAL is negative infinity). */
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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_bytes { 0, 0, 0, 0, 0, 0, 0xf0, 0x7f }
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# define __huge_val_t union { unsigned char __c[8]; double __d; }
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# ifdef __GNUC__
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# define HUGE_VAL (__extension__ \
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((__huge_val_t) { __c: __HUGE_VAL_bytes }).__d)
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# else /* Not GCC. */
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static __huge_val_t __huge_val = { __HUGE_VAL_bytes };
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# define HUGE_VAL (__huge_val.__d)
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# endif /* GCC. */
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#endif /* GCC 2.95 */
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/* ISO C99 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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# define __HUGE_VALF_bytes { 0, 0, 0x80, 0x7f }
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# define __huge_valf_t union { unsigned char __c[4]; float __f; }
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# ifdef __GNUC__
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# define HUGE_VALF (__extension__ \
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((__huge_valf_t) { __c: __HUGE_VALF_bytes }).__f)
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# else /* Not GCC. */
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static __huge_valf_t __huge_valf = { __HUGE_VALF_bytes };
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# define HUGE_VALF (__huge_valf.__f)
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# endif /* GCC. */
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# define __HUGE_VALL_bytes { 0, 0, 0, 0, 0, 0, 0, 0x80, 0xff, 0x7f, 0, 0 }
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# define __huge_vall_t union { unsigned char __c[12]; long double __ld; }
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# ifdef __GNUC__
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# define HUGE_VALL (__extension__ \
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((__huge_vall_t) { __c: __HUGE_VALL_bytes }).__ld)
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# else /* Not GCC. */
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static __huge_vall_t __huge_vall = { __HUGE_VALL_bytes };
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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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