/* Copyright (C) 2011-2019 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@gmail.com>, 2011. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ #include <fenv.h> #include <math.h> #include <math_private.h> #include <math-svid-compat.h> #include <libm-alias-double.h> #if LIBM_SVID_COMPAT && (SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_29) \ || defined NO_LONG_DOUBLE \ || defined LONG_DOUBLE_COMPAT) /* wrapper log2(x) */ double __log2_compat (double x) { if (__builtin_expect (islessequal (x, 0.0), 0) && _LIB_VERSION != _IEEE_) { if (x == 0.0) { feraiseexcept (FE_DIVBYZERO); return __kernel_standard (x, x, 48); /* log2(0) */ } else { feraiseexcept (FE_INVALID); return __kernel_standard (x, x, 49); /* log2(x<0) */ } } return __ieee754_log2 (x); } # if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_29) compat_symbol (libm, __log2_compat, log2, GLIBC_2_1); # endif # ifdef NO_LONG_DOUBLE weak_alias (__log2_compat, log2l) # endif # ifdef LONG_DOUBLE_COMPAT /* Work around gas bug "multiple versions for symbol". */ weak_alias (__log2_compat, __log2_compat_alias) LONG_DOUBLE_COMPAT_CHOOSE_libm_log2l ( compat_symbol (libm, __log2_compat_alias, log2l, FIRST_VERSION_libm_log2l), ); # endif #endif