aboutsummaryrefslogtreecommitdiff
path: root/arch/m32r/lib/memset.S
blob: b47fa3537aa4f16067473a9b7085beea3f79d6de (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
/*
 *  linux/arch/m32r/lib/memset.S
 *
 *  Copyright (C) 2001,2002  Hiroyuki Kondo, and Hirokazu Takata
 *  Copyright (C) 2004  Hirokazu Takata
 *
 *  void *memset(void *dst, int val, int len);
 *
 *        dst: r0
 *        val: r1
 *        len: r2
 *        ret: r0
 *
 */
/* $Id$ */


	.text
	.global	memset

#ifdef CONFIG_ISA_DUAL_ISSUE

	.align 4
memset:
	mv      r4, r0		    ||	cmpz	r2
	jc	r14
	cmpui	r2, #16
	bnc	qword_align_check
	cmpui	r2, #4
	bc	byte_set
word_align_check:			/* len >= 4 */
	and3	r3, r4, #3
	beqz	r3, word_set
	addi	r3, #-4
	neg	r3, r3			/* r3 = -(r3 - 4) */
align_word:
	stb	r1, @r4		    ||	addi	r4, #1
	addi	r2, #-1		    ||	addi	r3, #-1
	bnez	r3, align_word
	cmpui	r2, #4
	bc	byte_set
word_set:
	and3	r1, r1, #0x00ff		/* r1: abababab <-- ??????ab */
	sll3	r3, r1, #8
	or	r1, r3		    ||	addi	r4, #-4
	sll3	r3, r1, #16
	or	r1, r3		    ||	addi	r2, #-4
word_set_loop:
	st	r1, @+r4	    ||	addi	r2, #-4
	bgtz	r2, word_set_loop
	bnez	r2, byte_set_wrap
	st	r1, @+r4
	jmp	r14

qword_align_check:			/* len >= 16 */
	and3	r3, r4, #15
	bnez	r3, word_align_check
qword_set:
	and3	r1, r1, #0x00ff		/* r1: abababab <-- ??????ab */
	sll3	r3, r1, #8
	or	r1, r3		    ||	addi	r4, #-4
	sll3	r3, r1, #16
	or	r1, r3		    ||	ldi	r5, #16
qword_set_loop:
	ld	r3, @(4,r4)		/* cache line allocate */
	st	r1, @+r4	    ||	addi	r2, #-16
	st	r1, @+r4	    ||	cmpu	r2, r5
	st	r1, @+r4
	st	r1, @+r4
	bnc	qword_set_loop	    ||  cmpz	r2
	jc	r14
set_remainder:
	cmpui	r2, #4
	bc	byte_set_wrap1
	addi	r2, #-4
	bra	word_set_loop

byte_set_wrap:
	addi	r2, #4
	cmpz	r2
	jc	r14
byte_set_wrap1:
	addi	r4, #4
#if defined(CONFIG_ISA_M32R2)
byte_set:
	addi	r2, #-1		    ||	stb	r1, @r4+
	bnez	r2, byte_set
#elif defined(CONFIG_ISA_M32R)
byte_set:
	addi	r2, #-1		    ||	stb	r1, @r4
	addi	r4, #1
	bnez	r2, byte_set
#else
#error unknown isa configuration
#endif
end_memset:
	jmp	r14

#else /* not CONFIG_ISA_DUAL_ISSUE */

	.align 4
memset:
	mv      r4, r0
	beqz	r2, end_memset
	cmpui	r2, #16
	bnc	qword_align_check
	cmpui	r2, #4
	bc	byte_set
word_align_check:			/* len >= 4 */
	and3	r3, r4, #3
	beqz	r3, word_set
	addi	r3, #-4
	neg	r3, r3			/* r3 = -(r3 - 4) */
align_word:
	stb	r1, @r4
	addi	r4, #1
	addi	r2, #-1
	addi	r3, #-1
	bnez	r3, align_word
	cmpui	r2, #4
	bc	byte_set
word_set:
	and3	r1, r1, #0x00ff		/* r1: abababab <-- ??????ab */
	sll3	r3, r1, #8
	or	r1, r3
	sll3	r3, r1, #16
	or	r1, r3
	addi	r2, #-4
	addi	r4, #-4
word_set_loop:
	st	r1, @+r4
	addi	r2, #-4
	bgtz    r2, word_set_loop
	bnez	r2, byte_set_wrap
	st	r1, @+r4
	jmp	r14

qword_align_check:			/* len >= 16 */
	and3	r3, r4, #15
	bnez	r3, word_align_check
qword_set:
	and3	r1, r1, #0x00ff		/* r1: abababab <-- ??????ab */
	sll3	r3, r1, #8
	or	r1, r3
	sll3	r3, r1, #16
	or	r1, r3
	addi	r4, #-4
qword_set_loop:
	ld	r3, @(4,r4)		/* cache line allocate */
	addi	r2, #-16
	st	r1, @+r4
	st	r1, @+r4
	cmpui	r2, #16
	st	r1, @+r4
	st	r1, @+r4
	bnc	qword_set_loop
	bnez	r2, set_remainder
	jmp	r14
set_remainder:
	cmpui	r2, #4
	bc	byte_set_wrap1
	addi	r2, #-4
	bra	word_set_loop

byte_set_wrap:
	addi	r2, #4
	beqz	r2, end_memset
byte_set_wrap1:
	addi	r4, #4
byte_set:
	addi	r2, #-1
	stb	r1, @r4
	addi	r4, #1
	bnez	r2, byte_set
end_memset:
	jmp	r14

#endif /* not CONFIG_ISA_DUAL_ISSUE */

	.end