mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-28 13:31:13 +00:00
54 lines
1.5 KiB
C
54 lines
1.5 KiB
C
/* Single-precision floating point square root wrapper.
|
|
Copyright (C) 2004-2013 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.h>
|
|
#include <math_private.h>
|
|
#include <fenv_libc.h>
|
|
|
|
#include <sysdep.h>
|
|
#include <ldsodefs.h>
|
|
|
|
float
|
|
__sqrtf (float x) /* wrapper sqrtf */
|
|
{
|
|
#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)
|