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0f04fc07 | 1 | /* Compute square root for float. ARM version. |
04277e02 | 2 | Copyright (C) 2016-2019 Free Software Foundation, Inc. |
0f04fc07 JM |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
17 | <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #ifdef __SOFTFP__ | |
20 | ||
21 | /* Use architecture-indendent sqrtf implementation. */ | |
22 | # include <sysdeps/ieee754/flt-32/e_sqrtf.c> | |
23 | ||
24 | #else | |
25 | ||
26 | /* Use VFP square root instruction. */ | |
27 | # include <math.h> | |
28 | # include <sysdep.h> | |
29 | ||
30 | float | |
31 | __ieee754_sqrtf (float x) | |
32 | { | |
33 | float ret; | |
34 | # if __ARM_ARCH >= 6 | |
35 | asm ("vsqrt.f32 %0, %1" : "=t" (ret) : "t" (x)); | |
36 | # else | |
37 | /* As in GCC, for VFP9 Erratum 760019 avoid overwriting the | |
38 | input. */ | |
39 | asm ("vsqrt.f32 %0, %1" : "=&t" (ret) : "t" (x)); | |
40 | # endif | |
41 | return ret; | |
42 | } | |
43 | strong_alias (__ieee754_sqrtf, __sqrtf_finite) | |
44 | ||
45 | #endif |