1 | /* Copyright (C) 2012-2016 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | Contributed by Adhemerval Zanella <azanella@linux.vnet.ibm.com>, 2011. |
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 | #include <math.h> |
20 | #include <errno.h> |
21 | #include <limits.h> |
22 | #include <math_private.h> |
23 | |
24 | /* wrapper ilogb */ |
25 | int |
26 | __ilogb (double x) |
27 | { |
28 | int r = __ieee754_ilogb (x); |
29 | if (__builtin_expect (r == FP_ILOGB0, 0) |
30 | || __builtin_expect (r == FP_ILOGBNAN, 0) |
31 | || __builtin_expect (r == INT_MAX, 0)) |
32 | { |
33 | __set_errno (EDOM); |
34 | __feraiseexcept (FE_INVALID); |
35 | } |
36 | return r; |
37 | } |
38 | weak_alias (__ilogb, ilogb) |
39 | #ifdef NO_LONG_DOUBLE |
40 | strong_alias (__ilogb, __ilogbl) |
41 | weak_alias (__ilogb, ilogbl) |
42 | #endif |
43 | |