]>
Commit | Line | Data |
---|---|---|
1 | /* Copyright (C) 2011-2024 Free Software Foundation, Inc. | |
2 | This file is part of the GNU C Library. | |
3 | ||
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 | |
15 | License along with the GNU C Library; if not, see | |
16 | <https://www.gnu.org/licenses/>. */ | |
17 | ||
18 | #include <fenv.h> | |
19 | #include <math.h> | |
20 | #include <math_private.h> | |
21 | #include <math-svid-compat.h> | |
22 | #include <libm-alias-double.h> | |
23 | ||
24 | ||
25 | #if LIBM_SVID_COMPAT && (SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_29) \ | |
26 | || defined NO_LONG_DOUBLE \ | |
27 | || defined LONG_DOUBLE_COMPAT) | |
28 | /* wrapper log2(x) */ | |
29 | double | |
30 | __log2_compat (double x) | |
31 | { | |
32 | if (__builtin_expect (islessequal (x, 0.0), 0) && _LIB_VERSION != _IEEE_) | |
33 | { | |
34 | if (x == 0.0) | |
35 | { | |
36 | feraiseexcept (FE_DIVBYZERO); | |
37 | return __kernel_standard (x, x, 48); /* log2(0) */ | |
38 | } | |
39 | else | |
40 | { | |
41 | feraiseexcept (FE_INVALID); | |
42 | return __kernel_standard (x, x, 49); /* log2(x<0) */ | |
43 | } | |
44 | } | |
45 | ||
46 | return __ieee754_log2 (x); | |
47 | } | |
48 | # if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_29) | |
49 | compat_symbol (libm, __log2_compat, log2, GLIBC_2_1); | |
50 | # endif | |
51 | # ifdef NO_LONG_DOUBLE | |
52 | weak_alias (__log2_compat, log2l) | |
53 | # endif | |
54 | # ifdef LONG_DOUBLE_COMPAT | |
55 | /* Work around gas bug "multiple versions for symbol". */ | |
56 | weak_alias (__log2_compat, __log2_compat_alias) | |
57 | ||
58 | LONG_DOUBLE_COMPAT_CHOOSE_libm_log2l ( | |
59 | compat_symbol (libm, __log2_compat_alias, log2l, FIRST_VERSION_libm_log2l), ); | |
60 | # endif | |
61 | #endif |