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1 | /* Copyright (C) 2011-2021 Free Software Foundation, Inc. | |
2 | This file is part of the GNU C Library. | |
3 | Contributed by Ulrich Drepper <drepper@gmail.com>, 2011. | |
4 | ||
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 | |
16 | License along with the GNU C Library; if not, see | |
17 | <https://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include <fenv.h> | |
20 | #include <math.h> | |
21 | #include <math_private.h> | |
22 | #include <math-svid-compat.h> | |
23 | #include <libm-alias-double.h> | |
24 | ||
25 | ||
26 | #if LIBM_SVID_COMPAT | |
27 | /* wrapper log10(x) */ | |
28 | double | |
29 | __log10 (double x) | |
30 | { | |
31 | if (__builtin_expect (islessequal (x, 0.0), 0) && _LIB_VERSION != _IEEE_) | |
32 | { | |
33 | if (x == 0.0) | |
34 | { | |
35 | __feraiseexcept (FE_DIVBYZERO); | |
36 | return __kernel_standard (x, x, 18); /* log10(0) */ | |
37 | } | |
38 | else | |
39 | { | |
40 | __feraiseexcept (FE_INVALID); | |
41 | return __kernel_standard (x, x, 19); /* log10(x<0) */ | |
42 | } | |
43 | } | |
44 | ||
45 | return __ieee754_log10 (x); | |
46 | } | |
47 | libm_alias_double (__log10, log10) | |
48 | #endif |