1/*
2Copyright (c) 2013-2014 Andes Technology Corporation.
3All rights reserved.
4
5Redistribution and use in source and binary forms, with or without
6modification, are permitted provided that the following conditions are met:
7
8    Redistributions of source code must retain the above copyright
9    notice, this list of conditions and the following disclaimer.
10
11    Redistributions in binary form must reproduce the above copyright
12    notice, this list of conditions and the following disclaimer in the
13    documentation and/or other materials provided with the distribution.
14
15    The name of the company may not be used to endorse or promote
16    products derived from this software without specific prior written
17    permission.
18
19THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
20AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
22DISCLAIMED.  IN NO EVENT SHALL RED HAT INCORPORATED BE LIABLE FOR ANY
23DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
24(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
25LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
26ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
28SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29*/
30#include <picolibc.h>
31
32	.text
33	.align	1
34	.global  sqrtf
35	.type    sqrtf, @function
36sqrtf:
37	/* The input argument is supposed to be stored in $fs0.
38	   The return value is supposed to be stored in $fs0 either.  */
39
40	/* Clear the IEEE cumulative exceptions flags. ($fpcsr.b[6:2])  */
41	FMFCSR  $r0
42	bitci   $r0, $r0, #0b1111100
43	FMTCSR	$r0
44
45	fsqrts  $fs0, $fs0
46
47	/* Check the IEEE cumulative exceptions flags.  */
48	FMFCSR	$r5
49	bmski33 $r5, #2		/* Is $fpcsr.IVO('b2) set ?  */
50	bnez	$r5, .L_EDOM	/* Set errno as EDOM.  */
51
52	bmski33 $r5, #4		/* Is $fpcsr.OVF('b4) set ?  */
53	bnez	$r5, .L_ERANGE	/* Set errno as ERANGE.  */
54
55	bmski33 $r5, #5		/* Is $fpcsr.UDF('b5) set ?  */
56	bnez	$r5, .L_ERANGE	/* Set errno as ERANGE.  */
57
58	/* No error at all.  Just ret.  */
59	ret
60
61.L_EDOM:
62	movi	$r0, #33	/* EDOM: Math arg out of domain of func.  */
63	j	.L_Set_errno
64.L_ERANGE:
65	movi	$r0, #34	/* ERANGE: Math result not representable.  */
66.L_Set_errno:
67	l.w	$r15, _impure_ptr
68	swi	$r0, [$r15]	/* Set errno.  */
69	ret
70	.size sqrtf, .-sqrtf
71