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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 | |
0ac5ae23 UD |
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> |
9ac44708 | 23 | #include <libm-alias-double.h> |
601d2942 | 24 | |
0ac5ae23 | 25 | |
718d6542 SN |
26 | #if LIBM_SVID_COMPAT && (SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_29) \ |
27 | || defined NO_LONG_DOUBLE \ | |
28 | || defined LONG_DOUBLE_COMPAT) | |
0ac5ae23 | 29 | /* wrapper log2(x) */ |
601d2942 | 30 | double |
718d6542 | 31 | __log2_compat (double x) |
601d2942 | 32 | { |
92221550 | 33 | if (__builtin_expect (islessequal (x, 0.0), 0) && _LIB_VERSION != _IEEE_) |
601d2942 UD |
34 | { |
35 | if (x == 0.0) | |
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36 | { |
37 | feraiseexcept (FE_DIVBYZERO); | |
38 | return __kernel_standard (x, x, 48); /* log2(0) */ | |
39 | } | |
601d2942 | 40 | else |
0ac5ae23 UD |
41 | { |
42 | feraiseexcept (FE_INVALID); | |
43 | return __kernel_standard (x, x, 49); /* log2(x<0) */ | |
44 | } | |
601d2942 | 45 | } |
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46 | |
47 | return __ieee754_log2 (x); | |
601d2942 | 48 | } |
718d6542 SN |
49 | # if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_29) |
50 | compat_symbol (libm, __log2_compat, log2, GLIBC_2_1); | |
51 | # endif | |
52 | # ifdef NO_LONG_DOUBLE | |
53 | weak_alias (__log2_compat, log2l) | |
54 | # endif | |
55 | # ifdef LONG_DOUBLE_COMPAT | |
56 | /* Work around gas bug "multiple versions for symbol". */ | |
57 | weak_alias (__log2_compat, __log2_compat_alias) | |
58 | ||
59 | LONG_DOUBLE_COMPAT_CHOOSE_libm_log2l ( | |
60 | compat_symbol (libm, __log2_compat_alias, log2l, FIRST_VERSION_libm_log2l), ); | |
61 | # endif | |
601d2942 | 62 | #endif |