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2b778ceb | 1 | /* Copyright (C) 2011-2021 Free Software Foundation, Inc. |
0ac5ae23 | 2 | This file is part of the GNU C Library. |
601d2942 | 3 | |
0ac5ae23 UD |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Lesser General Public | |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
8 | ||
9 | The GNU C Library is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | Lesser General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
0ac5ae23 UD |
17 | |
18 | #include <fenv.h> | |
9d13fb24 | 19 | #include <math.h> |
9277c064 | 20 | #include <math_private.h> |
813378e9 | 21 | #include <math-svid-compat.h> |
92892fdb | 22 | #include <libm-alias-ldouble.h> |
601d2942 | 23 | |
0ac5ae23 | 24 | |
4f3647e4 | 25 | #if LIBM_SVID_COMPAT |
0ac5ae23 | 26 | /* wrapper log2l(x) */ |
601d2942 | 27 | long double |
0ac5ae23 | 28 | __log2l (long double x) |
601d2942 | 29 | { |
92221550 | 30 | if (__builtin_expect (islessequal (x, 0.0L), 0) && _LIB_VERSION != _IEEE_) |
601d2942 | 31 | { |
0ac5ae23 UD |
32 | if (x == 0.0L) |
33 | { | |
34 | feraiseexcept (FE_DIVBYZERO); | |
41bf21a1 | 35 | return __kernel_standard_l (x, x, 248); /* log2(0) */ |
0ac5ae23 | 36 | } |
601d2942 | 37 | else |
0ac5ae23 UD |
38 | { |
39 | feraiseexcept (FE_INVALID); | |
41bf21a1 | 40 | return __kernel_standard_l (x, x, 249); /* log2(x<0) */ |
0ac5ae23 | 41 | } |
601d2942 | 42 | } |
0ac5ae23 UD |
43 | |
44 | return __ieee754_log2l (x); | |
601d2942 | 45 | } |
92892fdb | 46 | libm_alias_ldouble (__log2, log2) |
4f3647e4 | 47 | #endif |