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__fpclassifyl (long double x)
27{
28 uint32_t ex, hx, lx;
29 int retval = FP_NORMAL;
30
31 GET_LDOUBLE_WORDS (ex, hx, lx, x);
32 ex &= 0x7fff;
33 if ((ex | lx | hx) == 0)
34 retval = FP_ZERO;
35 else if (ex == 0 && (hx & 0x80000000) == 0)
36 retval = FP_SUBNORMAL;
37 /* Pseudo-normals, i.e. pseudo-zero, pseudo-infinity and un-normals. They
38 behave like NaNs, so categorize them as such. */
39 else if ((hx & 0x80000000) == 0)
40 retval = FP_NAN;
41 else if (ex == 0x7fff)
42 retval = ((hx & 0x7fffffff) | lx) != 0 ? FP_NAN : FP_INFINITE;
43
44 return retval;
45}
46libm_hidden_def (__fpclassifyl)
47