1/*  Copyright (C) 2014-2022 Free Software Foundation, Inc.
2    Contributed by Dimitar Dimitrov <dimitar@dinux.eu>
3
4  This file is free software; you can redistribute it and/or modify it
5  under the terms of the GNU General Public License as published by the
6  Free Software Foundation; either version 3, or (at your option) any
7  later version.
8
9  This file is distributed in the hope that it will be useful, but
10  WITHOUT ANY WARRANTY; without even the implied warranty of
11  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12  General Public License for more details.
13
14  Under Section 7 of GPL version 3, you are granted additional
15  permissions described in the GCC Runtime Library Exception, version
16  3.1, as published by the Free Software Foundation.
17
18  You should have received a copy of the GNU General Public License and
19  a copy of the GCC Runtime Library Exception along with this program;
20  see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
21  <http://www.gnu.org/licenses/>.
22
23      (al + C * ah) * (bl + C * bh) =    al * bl
24				       + C * ah * bl
25				       + C * al * bh
26				       + C * C * ah * bh  -> discard, overflow
27	Where C=(1 << 32)
28  */
29
30#include "pru-asm.h"
31
32	.section .text.__pruabi_mpyll, "ax"
33
34	.global	SYM(__pruabi_mpyll)
35	FUNC(__pruabi_mpyll)
36SYM(__pruabi_mpyll):
37	/* + C * ah * bl */
38	mov	r28, r15
39	mov	r29, r16
40	nop
41	xin	0, r26, 8
42
43	/* + C * al * bh */
44	mov	r28, r14
45	mov	r29, r17
46	mov	r15, r26		/* "Loose" ah, record only reslo.  */
47	xin	0, r26, 8
48
49	/* + al * bl */
50	/* mov	r28, r14		-> No need, already loaded.  */
51	mov	r29, r16
52	add	r15, r15, r26
53	xin	0, r26, 8
54	mov	r14, r26
55	add	r15, r15, r27
56
57	ret
58
59	ENDFUNC(__pruabi_mpyll)
60