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1/* Return 1 if argument is a NaN, else 0.
2 Copyright (C) 2007-2019 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library. If not, see
17 <http://www.gnu.org/licenses/>. */
18
19/* Ugly kludge to avoid declarations. */
20#define __isnanf not___isnanf
21#define isnanf not_isnanf
22#define __GI___isnanf not__GI___isnanf
23
24#include <math.h>
25#include <math_private.h>
26#include <math_ldbl_opt.h>
27
28#undef __isnanf
29#undef isnanf
30#undef __GI___isnanf
31
32int
33__isnan (double x)
34{
35 uint64_t ix;
36 EXTRACT_WORDS64 (ix, x);
37 return ix * 2 > 0xffe0000000000000ul;
38}
39
40hidden_def (__isnan)
41weak_alias (__isnan, isnan)
42
43/* It turns out that the 'double' version will also always work for
44 single-precision. */
45strong_alias (__isnan, __isnanf)
46weak_alias (__isnan, isnanf)
47
48/* ??? GCC 4.8 fails to look through chains of aliases with asm names
49 attached. Work around this for now. */
50hidden_ver (__isnan, __isnanf)
51
52#ifdef NO_LONG_DOUBLE
53strong_alias (__isnan, __isnanl)
54weak_alias (__isnan, isnanl)
55#endif
56#if LONG_DOUBLE_COMPAT(libc, GLIBC_2_0)
57compat_symbol (libc, __isnan, __isnanl, GLIBC_2_0);
58compat_symbol (libc, isnan, isnanl, GLIBC_2_0);
59#endif
60

Warning: That file was not part of the compilation database. It may have many parsing errors.