| /* Compute square root for double. ARM version. |
| Copyright (C) 2016-2018 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 |
