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55a38f82 | 1 | /* Wrapper to implement llogb in terms of ilogb. |
2b778ceb | 2 | Copyright (C) 2012-2021 Free Software Foundation, Inc. |
55a38f82 JM |
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 | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
55a38f82 JM |
18 | |
19 | #include <math.h> | |
20 | #include <errno.h> | |
21 | #include <limits.h> | |
22 | #include <math_private.h> | |
418d99e6 | 23 | #include <fenv.h> |
55a38f82 JM |
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) |