mirror of
https://sourceware.org/git/glibc.git
synced 2025-01-12 12:10:16 +00:00
46 lines
1.3 KiB
C
46 lines
1.3 KiB
C
|
/* Compute square root for double. ARM version.
|
||
|
Copyright (C) 2016 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/>. */
|
||
|
|
||
|
#ifdef __SOFTFP__
|
||
|
|
||
|
/* Use architecture-indendent sqrt implementation. */
|
||
|
# include <sysdeps/ieee754/dbl-64/e_sqrt.c>
|
||
|
|
||
|
#else
|
||
|
|
||
|
/* Use VFP square root instruction. */
|
||
|
# include <math.h>
|
||
|
# include <sysdep.h>
|
||
|
|
||
|
double
|
||
|
__ieee754_sqrt (double x)
|
||
|
{
|
||
|
double ret;
|
||
|
# if __ARM_ARCH >= 6
|
||
|
asm ("vsqrt.f64 %P0, %P1" : "=w" (ret) : "w" (x));
|
||
|
# else
|
||
|
/* As in GCC, for VFP9 Erratum 760019 avoid overwriting the
|
||
|
input. */
|
||
|
asm ("vsqrt.f64 %P0, %P1" : "=&w" (ret) : "w" (x));
|
||
|
# endif
|
||
|
return ret;
|
||
|
}
|
||
|
strong_alias (__ieee754_sqrt, __sqrt_finite)
|
||
|
|
||
|
#endif
|