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/* Double-precision floating point square root wrapper.
Copyright (C) 2004, 2007, 2012 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
<http://www.gnu.org/licenses/>. */
#include <math_ldbl_opt.h>
#include "math.h"
#include "math_private.h"
#include <fenv_libc.h>
double
__sqrt (double x) /* wrapper sqrt */
{
double z;
/* Power4 (ISA V2.0) and above implement sqrt in hardware. */
__asm __volatile (
" fsqrt %0,%1\n"
: "=f" (z)
: "f" (x));
#ifdef _IEEE_LIBM
return z;
#else
if (__builtin_expect (_LIB_VERSION == _IEEE_, 0))
return z;
if (__builtin_expect (x != x, 0))
return z;
if (__builtin_expect (x < 0.0, 0))
return __kernel_standard (x, x, 26); /* sqrt(negative) */
else
return z;
#endif
}
weak_alias (__sqrt, sqrt)
#ifdef NO_LONG_DOUBLE
strong_alias (__sqrt, __sqrtl) weak_alias (__sqrt, sqrtl)
#endif
#if LONG_DOUBLE_COMPAT(libm, GLIBC_2_0)
compat_symbol (libm, __sqrt, sqrtl, GLIBC_2_0);
#endif
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