1// SPDX-License-Identifier: GPL-2.0
2// Copyright (C) 2005-2017 Andes Technology Corporation
3
4
5	beq	$r1, $r0, quit_memcpy
6	beqz	$r2, quit_memcpy
7	srli    $r3, $r2, #5	! check if len < cache-line size 32
8	beqz	$r3, word_copy_entry
9	andi	$r4, $r0, #0x3	! check byte-align
10	beqz	$r4, unalign_word_copy_entry
11
12	addi	$r4, $r4,#-4
13	abs	$r4, $r4	! check how many un-align byte to copy
14	sub	$r2, $r2, $r4	! update $R2
15
16unalign_byte_copy:
17	lbi1	$r3, $r1, #1
18	addi	$r4, $r4, #-1
19	sbi1	$r3, $r0, #1
20	bnez	$r4, unalign_byte_copy
21	beqz	$r2, quit_memcpy
22
23unalign_word_copy_entry:
24	andi	$r3, $r0, 0x1f	! check cache-line unaligncount
25	beqz	$r3, cache_copy
26
27	addi	$r3, $r3, #-32
28	abs	$r3, $r3
29	sub	$r2, $r2, $r3	! update $R2
30
31unalign_word_copy:
32	lmw1	$r4, $r1, $r4
33	addi	$r3, $r3, #-4
34	smw1	$r4, $r0, $r4
35	bnez	$r3, unalign_word_copy
36	beqz	$r2, quit_memcpy
37
38	addi	$r3, $r2, #-32	! to check $r2< cache_line , than go to word_copy
39	bltz	$r3, word_copy_entry
40cache_copy:
41	srli	$r3, $r2, #5
42	beqz	$r3, word_copy_entry
433:
44	lmw1	$r17, $r1, $r24
45	addi	$r3, $r3, #-1
46	smw1	$r17, $r0, $r24
47	bnez	$r3, 3b
48
49word_copy_entry:
50	andi	$r2, $r2, #31
51
52	beqz	$r2, quit_memcpy
535:
54	srli	$r3, $r2, #2
55	beqz	$r3, byte_copy
56word_copy:
57	lmw1	$r4, $r1, $r4
58	addi	$r3, $r3, #-1
59	smw1	$r4, $r0, $r4
60	bnez	$r3, word_copy
61	andi	$r2, $r2, #3
62	beqz	$r2, quit_memcpy
63byte_copy:
64	lbi1	$r3, $r1, #1
65	addi	$r2, $r2, #-1
66
67	sbi1	$r3, $r0, #1
68	bnez	$r2, byte_copy
69quit_memcpy:
70