1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
|
/* Return 1 if argument is a NaN, else 0.
Copyright (C) 2007-2014 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
<http://www.gnu.org/licenses/>. */
/* Ugly kludge to avoid declarations. */
#define __isnanf not___isnanf
#define isnanf not_isnanf
#define __GI___isnanf not__GI___isnanf
#include <math.h>
#include <math_ldbl_opt.h>
#undef __isnanf
#undef isnanf
#undef __GI___isnanf
int
__isnan (double x)
{
uint64_t ix;
EXTRACT_WORDS64 (ix, x);
return ix * 2 > 0xffe0000000000000ul;
}
hidden_def (__isnan)
weak_alias (__isnan, isnan)
/* It turns out that the 'double' version will also always work for
single-precision. */
strong_alias (__isnan, __isnanf)
weak_alias (__isnan, isnanf)
/* ??? GCC 4.8 fails to look through chains of aliases with asm names
attached. Work around this for now. */
hidden_ver (__isnan, __isnanf)
#ifdef NO_LONG_DOUBLE
strong_alias (__isnan, __isnanl)
weak_alias (__isnan, isnanl)
#endif
#if LONG_DOUBLE_COMPAT(libc, GLIBC_2_0)
compat_symbol (libc, __isnan, __isnanl, GLIBC_2_0);
compat_symbol (libc, isnan, isnanl, GLIBC_2_0);
#endif
|
