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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, 2002 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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Fixed by Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>.
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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, see
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<http://www.gnu.org/licenses/>. */
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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, m;
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int retval = FP_NORMAL;
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GET_LDOUBLE_WORDS (ex, hx, lx, x);
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m = (hx & 0x7fffffff) | lx;
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ex &= 0x7fff;
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if ((ex | m) == 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 = m != 0 ? FP_NAN : FP_INFINITE;
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return retval;
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}
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libm_hidden_def (__fpclassifyl)
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