1 | /* Wrapper to implement llogb in terms of ilogb. |
2 | Copyright (C) 2012-2022 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 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <math.h> |
20 | #include <errno.h> |
21 | #include <limits.h> |
22 | #include <math_private.h> |
23 | #include <fenv.h> |
24 | |
25 | long int |
26 | M_DECL_FUNC (__llogb) (FLOAT x) |
27 | { |
28 | int r = M_SUF (__ieee754_ilogb) (x); |
29 | long int lr = r; |
30 | if (__glibc_unlikely (r == FP_ILOGB0) |
31 | || __glibc_unlikely (r == FP_ILOGBNAN) |
32 | || __glibc_unlikely (r == INT_MAX)) |
33 | { |
34 | #if LONG_MAX != INT_MAX |
35 | if (r == FP_ILOGB0) |
36 | lr = FP_LLOGB0; |
37 | else if (r == FP_ILOGBNAN) |
38 | lr = FP_LLOGBNAN; |
39 | else |
40 | lr = LONG_MAX; |
41 | #endif |
42 | __set_errno (EDOM); |
43 | __feraiseexcept (FE_INVALID); |
44 | } |
45 | return lr; |
46 | } |
47 | declare_mgen_alias (__llogb, llogb) |
48 | |