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/* Return X^Y, with special cases based on exp(Y*log(X)).
Copyright (C) 2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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 <errno.h>
#include <math.h>
#include <math_private.h>
FLOAT
M_DECL_FUNC (__powr) (FLOAT x, FLOAT y)
{
if (isless (x, M_LIT (0.0))
|| (x == M_LIT (0.0) && y == M_LIT (0.0))
|| (x == M_LIT (1.0) && isinf (y))
|| (isinf (x) && y == M_LIT (0.0)))
{
__set_errno (EDOM);
return (x - x) / (x - x);
}
if (isnan (x) || isnan (y))
return x + y;
x = M_FABS (x);
FLOAT ret = M_SUF (__ieee754_pow) (x, y);
if (!isfinite (ret))
{
if (isfinite (x) && isfinite (y))
__set_errno (ERANGE);
}
else if (ret == 0
&& isfinite (x)
&& x != 0
&& isfinite (y))
__set_errno (ERANGE);
return ret;
}
declare_mgen_alias (__powr, powr);
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