1/* Return classification value corresponding to argument.
2 Copyright (C) 1997-2021 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
5
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
10
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <https://www.gnu.org/licenses/>. */
19
20#include <math.h>
21
22#include <math_private.h>
23
24
25int
26__fpclassify (double x)
27{
28 uint32_t hx, lx;
29 int retval = FP_NORMAL;
30
31 EXTRACT_WORDS (hx, lx, x);
32 lx |= hx & 0xfffff;
33 hx &= 0x7ff00000;
34 if ((hx | lx) == 0)
35 retval = FP_ZERO;
36 else if (hx == 0)
37 retval = FP_SUBNORMAL;
38 else if (hx == 0x7ff00000)
39 retval = lx != 0 ? FP_NAN : FP_INFINITE;
40
41 return retval;
42}
43libm_hidden_def (__fpclassify)
44