projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 55a38f82 | 1 | /* Wrapper to implement llogb in terms of ilogb. |
| bfff8b1b | 2 | Copyright (C) 2012-2017 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 | |
| 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 | long int | |
| 25 | M_DECL_FUNC (__llogb) (FLOAT x) | |
| 26 | { | |
| 27 | int r = M_SUF (__ieee754_ilogb) (x); | |
| 28 | long int lr = r; | |
| 29 | if (__glibc_unlikely (r == FP_ILOGB0) | |
| 30 | || __glibc_unlikely (r == FP_ILOGBNAN) | |
| 31 | || __glibc_unlikely (r == INT_MAX)) | |
| 32 | { | |
| 33 | #if LONG_MAX != INT_MAX | |
| 34 | if (r == FP_ILOGB0) | |
| 35 | lr = FP_LLOGB0; | |
| 36 | else if (r == FP_ILOGBNAN) | |
| 37 | lr = FP_LLOGBNAN; | |
| 38 | else | |
| 39 | lr = LONG_MAX; | |
| 40 | #endif | |
| 41 | __set_errno (EDOM); | |
| 42 | __feraiseexcept (FE_INVALID); | |
| 43 | } | |
| 44 | return lr; | |
| 45 | } | |
| 46 | declare_mgen_alias (__llogb, llogb) |