| xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame] | 1 | /* Copyright (C) 2011-2016 Free Software Foundation, Inc. |
| 2 | This file is part of the GNU C Library. |
| 3 | Contributed by Ulrich Drepper <drepper@gmail.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 <fenv.h> |
| 20 | #include <math.h> |
| 21 | #include <math_private.h> |
| 22 | |
| 23 | |
| 24 | /* wrapper log2l(x) */ |
| 25 | long double |
| 26 | __log2l (long double x) |
| 27 | { |
| 28 | if (__builtin_expect (islessequal (x, 0.0L), 0) && _LIB_VERSION != _IEEE_) |
| 29 | { |
| 30 | if (x == 0.0L) |
| 31 | { |
| 32 | feraiseexcept (FE_DIVBYZERO); |
| 33 | return __kernel_standard_l (x, x, 248); /* log2(0) */ |
| 34 | } |
| 35 | else |
| 36 | { |
| 37 | feraiseexcept (FE_INVALID); |
| 38 | return __kernel_standard_l (x, x, 249); /* log2(x<0) */ |
| 39 | } |
| 40 | } |
| 41 | |
| 42 | return __ieee754_log2l (x); |
| 43 | } |
| 44 | weak_alias (__log2l, log2l) |