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44 lines
1.3 KiB
C
44 lines
1.3 KiB
C
/* Return classification value corresponding to argument.
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Copyright (C) 1997-2017 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 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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__fpclassify (double x)
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{
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u_int32_t hx, lx;
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int retval = FP_NORMAL;
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EXTRACT_WORDS (hx, lx, x);
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lx |= hx & 0xfffff;
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hx &= 0x7ff00000;
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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 == 0x7ff00000)
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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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libm_hidden_def (__fpclassify)
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