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43 lines
1.4 KiB
C
43 lines
1.4 KiB
C
/* Return classification value corresponding to argument.
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Copyright (C) 1997, 2000 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.
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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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 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_int32_t ex, hx, lx;
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int retval = FP_NORMAL;
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GET_LDOUBLE_WORDS (ex, hx, lx, x);
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ex &= 0x7fff;
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if ((ex | lx | hx) == 0)
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retval = FP_ZERO;
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else if (ex == 0 && (hx & 0x80000000) == 0)
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retval = FP_SUBNORMAL;
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else if (ex == 0x7fff)
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retval = ((hx & 0x7fffffff) | lx) != 0 ? FP_NAN : FP_INFINITE;
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return retval;
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}
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