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/* Return classification value corresponding to argument.
Copyright (C) 1997-2023 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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
<https://www.gnu.org/licenses/>. */
#include <math.h>
#include <math_private.h>
int
__fpclassify (double x)
{
uint32_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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