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/* Copyright (C) 2011-2021 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
<https://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
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