1 /* Copyright (C) 2011-2021 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
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/>. */
20 #include <math_private.h>
21 #include <math-svid-compat.h>
22 #include <libm-alias-double.h>
25 #if LIBM_SVID_COMPAT && (SHLIB_COMPAT (libm, GLIBC_2_0, GLIBC_2_29) \
26 || defined NO_LONG_DOUBLE \
27 || defined LONG_DOUBLE_COMPAT)
30 __log_compat (double x)
32 if (__builtin_expect (islessequal (x, 0.0), 0) && _LIB_VERSION != _IEEE_)
36 __feraiseexcept (FE_DIVBYZERO);
37 return __kernel_standard (x, x, 16); /* log(0) */
41 __feraiseexcept (FE_INVALID);
42 return __kernel_standard (x, x, 17); /* log(x<0) */
46 return __ieee754_log (x);
48 # if SHLIB_COMPAT (libm, GLIBC_2_0, GLIBC_2_29)
49 compat_symbol (libm, __log_compat, log, GLIBC_2_0);
51 # ifdef NO_LONG_DOUBLE
52 weak_alias (__log_compat, logl)
54 # ifdef LONG_DOUBLE_COMPAT
55 /* Work around gas bug "multiple versions for symbol". */
56 weak_alias (__log_compat, __log_compat_alias)
58 LONG_DOUBLE_COMPAT_CHOOSE_libm_logl (
59 compat_symbol (libm, __log_compat_alias, logl, FIRST_VERSION_libm_logl), );