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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 <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_0, GLIBC_2_29) \
|| defined NO_LONG_DOUBLE \
|| defined LONG_DOUBLE_COMPAT)
/* wrapper pow */
double
__pow_compat (double x, double y)
{
double z = __ieee754_pow (x, y);
if (__glibc_unlikely (!isfinite (z)))
{
if (_LIB_VERSION != _IEEE_)
{
if (isfinite (x) && isfinite (y))
{
if (isnan (z))
/* pow neg**non-int */
return __kernel_standard (x, y, 24);
else if (x == 0.0 && y < 0.0)
{
if (signbit (x) && signbit (z))
/* pow(-0.0,negative) */
return __kernel_standard (x, y, 23);
else
/* pow(+0.0,negative) */
return __kernel_standard (x, y, 43);
}
else
/* pow overflow */
return __kernel_standard (x, y, 21);
}
}
}
else if (__builtin_expect (z == 0.0, 0)
&& isfinite (x) && x != 0 && isfinite (y)
&& _LIB_VERSION != _IEEE_)
/* pow underflow */
return __kernel_standard (x, y, 22);
return z;
}
# if SHLIB_COMPAT (libm, GLIBC_2_0, GLIBC_2_29)
compat_symbol (libm, __pow_compat, pow, GLIBC_2_0);
# endif
# ifdef NO_LONG_DOUBLE
weak_alias (__pow_compat, powl)
# endif
# ifdef LONG_DOUBLE_COMPAT
/* Work around gas bug "multiple versions for symbol". */
weak_alias (__pow_compat, __pow_compat_alias)
LONG_DOUBLE_COMPAT_CHOOSE_libm_powl (
compat_symbol (libm, __pow_compat_alias, powl, FIRST_VERSION_libm_powl), );
# endif
#endif
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