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- /* Return classification value corresponding to argument.
- Copyright (C) 1997, 2002 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <http://www.gnu.org/licenses/>. */
- #include <math.h>
- #include "math_private.h"
- int __fpclassify(double x)
- {
- u_int32_t hx, lx;
- int retval = FP_NORMAL;
- EXTRACT_WORDS (hx, lx, x);
- lx |= hx & 0xfffff;
- hx &= 0x7ff00000;
- if ((hx | lx) == 0)
- retval = FP_ZERO;
- else if (hx == 0)
- retval = FP_SUBNORMAL;
- else if (hx == 0x7ff00000)
- retval = lx != 0 ? FP_NAN : FP_INFINITE;
- return retval;
- }
- libm_hidden_def(__fpclassify)
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