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/* Compute square root for double. ARM version.
Copyright (C) 2016-2020 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
<https://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>
# include <libm-alias-finite.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;
}
libm_alias_finite (__ieee754_sqrt, __sqrt)
#endif
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