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/* Copyright (C) 2011-2016 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 <math.h>
#include "math_private.h"
/* wrapper powf */
float
powf (float x, float y)
{
#if __UCLIBC_HAS_FENV__
float z = (float) __ieee754_pow ((double) x, (double) y);
if (__builtin_expect (!isfinite (z), 0))
{
if (_LIB_VERSION != _IEEE_)
{
if (isnan (x))
{
if (y == 0.0f)
/* pow(NaN,0.0) */
return __kernel_standard_f (x, y, 142);
}
else if (isfinite (x) && isfinite (y))
{
if (isnan (z))
/* pow neg**non-int */
return __kernel_standard_f (x, y, 124);
else if (x == 0.0f && y < 0.0f)
{
if (signbit (x) && signbit (z))
/* pow(-0.0,negative) */
return __kernel_standard_f (x, y, 123);
else
/* pow(+0.0,negative) */
return __kernel_standard_f (x, y, 143);
}
else
/* pow overflow */
return __kernel_standard_f (x, y, 121);
}
}
}
else if (__builtin_expect (z == 0.0f, 0) && isfinite (x) && isfinite (y)
&& _LIB_VERSION != _IEEE_)
{
if (x == 0.0f)
{
if (y == 0.0f)
/* pow(0.0,0.0) */
return __kernel_standard_f (x, y, 120);
}
else
/* pow underflow */
return __kernel_standard_f (x, y, 122);
}
return z;
#else
return (float) __ieee754_pow ((double) x, (double) y);
#endif /* __UCLIBC_HAS_FENV__ */
}
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