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/* Single-precision floating point square root wrapper.
Copyright (C) 2004, 2007 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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include "math.h"
#include "math_private.h"
#include <fenv_libc.h>
#include <sysdep.h>
#include <ldsodefs.h>
#ifdef __STDC__
float
__sqrtf (float x) /* wrapper sqrtf */
#else
float
__sqrtf (x) /* wrapper sqrtf */
float x;
#endif
{
#ifdef _IEEE_LIBM
return __ieee754_sqrtf (x);
#else
float z;
/* Power4 (ISA V2.0) and above implement sqrtf in hardware. */
__asm __volatile (
" fsqrts %0,%1\n"
: "=f" (z)
: "f" (x));
if (__builtin_expect (_LIB_VERSION == _IEEE_, 0))
return z;
if (__builtin_expect (x != x, 0))
return z;
if (__builtin_expect (x < 0.0, 0))
/* sqrtf(negative) */
return (float) __kernel_standard ((double) x, (double) x, 126);
else
return z;
#endif
}
weak_alias (__sqrtf, sqrtf)
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