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688903eb | 1 | /* Copyright (C) 2011-2018 Free Software Foundation, Inc. |
0ac5ae23 UD |
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> |
813378e9 | 22 | #include <math-svid-compat.h> |
92892fdb | 23 | #include <libm-alias-ldouble.h> |
601d2942 | 24 | |
0ac5ae23 | 25 | |
4f3647e4 | 26 | #if LIBM_SVID_COMPAT |
0ac5ae23 | 27 | /* wrapper log2l(x) */ |
601d2942 | 28 | long double |
0ac5ae23 | 29 | __log2l (long double x) |
601d2942 | 30 | { |
92221550 | 31 | if (__builtin_expect (islessequal (x, 0.0L), 0) && _LIB_VERSION != _IEEE_) |
601d2942 | 32 | { |
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33 | if (x == 0.0L) |
34 | { | |
35 | feraiseexcept (FE_DIVBYZERO); | |
41bf21a1 | 36 | return __kernel_standard_l (x, x, 248); /* log2(0) */ |
0ac5ae23 | 37 | } |
601d2942 | 38 | else |
0ac5ae23 UD |
39 | { |
40 | feraiseexcept (FE_INVALID); | |
41bf21a1 | 41 | return __kernel_standard_l (x, x, 249); /* log2(x<0) */ |
0ac5ae23 | 42 | } |
601d2942 | 43 | } |
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44 | |
45 | return __ieee754_log2l (x); | |
601d2942 | 46 | } |
92892fdb | 47 | libm_alias_ldouble (__log2, log2) |
4f3647e4 | 48 | #endif |