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bebc4903 | 1 | /* Return 1 if argument is a NaN, else 0. |
2b778ceb | 2 | Copyright (C) 2007-2021 Free Software Foundation, Inc. |
bebc4903 RH |
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 | |
ab84e3ff | 16 | License along with the GNU C Library. If not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
bebc4903 RH |
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> | |
0d13dfa1 | 25 | #include <math_private.h> |
bebc4903 RH |
26 | #include <math_ldbl_opt.h> |
27 | ||
28 | #undef __isnanf | |
29 | #undef isnanf | |
30 | #undef __GI___isnanf | |
31 | ||
bebc4903 RH |
32 | int |
33 | __isnan (double x) | |
34 | { | |
631021e0 RH |
35 | uint64_t ix; |
36 | EXTRACT_WORDS64 (ix, x); | |
37 | return ix * 2 > 0xffe0000000000000ul; | |
bebc4903 RH |
38 | } |
39 | ||
40 | hidden_def (__isnan) | |
41 | weak_alias (__isnan, isnan) | |
42 | ||
43 | /* It turns out that the 'double' version will also always work for | |
44 | single-precision. */ | |
45 | strong_alias (__isnan, __isnanf) | |
b2d36dda RH |
46 | weak_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. */ | |
50 | hidden_ver (__isnan, __isnanf) | |
bebc4903 RH |
51 | |
52 | #ifdef NO_LONG_DOUBLE | |
53 | strong_alias (__isnan, __isnanl) | |
54 | weak_alias (__isnan, isnanl) | |
55 | #endif | |
91d46f8a RH |
56 | #if LONG_DOUBLE_COMPAT(libc, GLIBC_2_0) |
57 | compat_symbol (libc, __isnan, __isnanl, GLIBC_2_0); | |
58 | compat_symbol (libc, isnan, isnanl, GLIBC_2_0); | |
bebc4903 | 59 | #endif |