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92221550 | 1 | /* Copyright (C) 2011, 2012 Free Software Foundation, Inc. |
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2 | This file is part of the GNU C Library. |
3 | Contributed by Ulrich Drepper <drepper@gmail.com>, 2011. | |
601d2942 | 4 | |
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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 | |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
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18 | |
19 | #include <fenv.h> | |
9d13fb24 | 20 | #include <math.h> |
9277c064 | 21 | #include <math_private.h> |
601d2942 | 22 | |
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23 | |
24 | /* wrapper log2l(x) */ | |
601d2942 | 25 | long double |
0ac5ae23 | 26 | __log2l (long double x) |
601d2942 | 27 | { |
92221550 | 28 | if (__builtin_expect (islessequal (x, 0.0L), 0) && _LIB_VERSION != _IEEE_) |
601d2942 | 29 | { |
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30 | if (x == 0.0L) |
31 | { | |
32 | feraiseexcept (FE_DIVBYZERO); | |
33 | return __kernel_standard (x, x, 248); /* log2(0) */ | |
34 | } | |
601d2942 | 35 | else |
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36 | { |
37 | feraiseexcept (FE_INVALID); | |
38 | return __kernel_standard (x, x, 249); /* log2(x<0) */ | |
39 | } | |
601d2942 | 40 | } |
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41 | |
42 | return __ieee754_log2l (x); | |
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43 | } |
44 | weak_alias (__log2l, log2l) |