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.
45 lines
1.4 KiB
C
45 lines
1.4 KiB
C
/* Return classification value corresponding to argument.
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Copyright (C) 1997, 1999 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997 and
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Jakub Jelinek <jj@ultra.linux.cz>, 1999.
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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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#include <math.h>
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#include "math_private.h"
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int
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__fpclassifyl (long double x)
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{
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u_int64_t hx, lx;
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int retval = FP_NORMAL;
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GET_LDOUBLE_WORDS64 (hx, lx, x);
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lx |= (hx & 0x0000ffffffffffffLL);
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hx &= 0x7fff000000000000LL;
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if ((hx | lx) == 0)
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retval = FP_ZERO;
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else if (hx == 0)
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retval = FP_SUBNORMAL;
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else if (hx == 0x7fff000000000000LL)
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retval = lx != 0 ? FP_NAN : FP_INFINITE;
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return retval;
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}
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