summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/lib/memcpy_64.S
blob: 7173ba98f427d293fc6f66727a4448be2da40ff2 (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
/*
 * Copyright (C) 2002 Paul Mackerras, IBM Corp.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */
#include <asm/processor.h>
#include <asm/ppc_asm.h>

	.align	7
_GLOBAL(memcpy)
	std	r3,48(r1)	/* save destination pointer for return value */
	mtcrf	0x01,r5
	cmpldi	cr1,r5,16
	neg	r6,r3		# LS 3 bits = # bytes to 8-byte dest bdry
	andi.	r6,r6,7
	dcbt	0,r4
	blt	cr1,.Lshort_copy
	bne	.Ldst_unaligned
.Ldst_aligned:
	andi.	r0,r4,7
	addi	r3,r3,-16
	bne	.Lsrc_unaligned
	srdi	r7,r5,4
	ld	r9,0(r4)
	addi	r4,r4,-8
	mtctr	r7
	andi.	r5,r5,7
	bf	cr7*4+0,2f
	addi	r3,r3,8
	addi	r4,r4,8
	mr	r8,r9
	blt	cr1,3f
1:	ld	r9,8(r4)
	std	r8,8(r3)
2:	ldu	r8,16(r4)
	stdu	r9,16(r3)
	bdnz	1b
3:	std	r8,8(r3)
	beq	3f
	addi	r3,r3,16
	ld	r9,8(r4)
.Ldo_tail:
	bf	cr7*4+1,1f
	rotldi	r9,r9,32
	stw	r9,0(r3)
	addi	r3,r3,4
1:	bf	cr7*4+2,2f
	rotldi	r9,r9,16
	sth	r9,0(r3)
	addi	r3,r3,2
2:	bf	cr7*4+3,3f
	rotldi	r9,r9,8
	stb	r9,0(r3)
3:	ld	r3,48(r1)	/* return dest pointer */
	blr

.Lsrc_unaligned:
	srdi	r6,r5,3
	addi	r5,r5,-16
	subf	r4,r0,r4
	srdi	r7,r5,4
	sldi	r10,r0,3
	cmpdi	cr6,r6,3
	andi.	r5,r5,7
	mtctr	r7
	subfic	r11,r10,64
	add	r5,r5,r0

	bt	cr7*4+0,0f

	ld	r9,0(r4)	# 3+2n loads, 2+2n stores
	ld	r0,8(r4)
	sld	r6,r9,r10
	ldu	r9,16(r4)
	srd	r7,r0,r11
	sld	r8,r0,r10
	or	r7,r7,r6
	blt	cr6,4f
	ld	r0,8(r4)
	# s1<< in r8, d0=(s0<<|s1>>) in r7, s3 in r0, s2 in r9, nix in r6 & r12
	b	2f

0:	ld	r0,0(r4)	# 4+2n loads, 3+2n stores
	ldu	r9,8(r4)
	sld	r8,r0,r10
	addi	r3,r3,-8
	blt	cr6,5f
	ld	r0,8(r4)
	srd	r12,r9,r11
	sld	r6,r9,r10
	ldu	r9,16(r4)
	or	r12,r8,r12
	srd	r7,r0,r11
	sld	r8,r0,r10
	addi	r3,r3,16
	beq	cr6,3f

	# d0=(s0<<|s1>>) in r12, s1<< in r6, s2>> in r7, s2<< in r8, s3 in r9
1:	or	r7,r7,r6
	ld	r0,8(r4)
	std	r12,8(r3)
2:	srd	r12,r9,r11
	sld	r6,r9,r10
	ldu	r9,16(r4)
	or	r12,r8,r12
	stdu	r7,16(r3)
	srd	r7,r0,r11
	sld	r8,r0,r10
	bdnz	1b

3:	std	r12,8(r3)
	or	r7,r7,r6
4:	std	r7,16(r3)
5:	srd	r12,r9,r11
	or	r12,r8,r12
	std	r12,24(r3)
	beq	4f
	cmpwi	cr1,r5,8
	addi	r3,r3,32
	sld	r9,r9,r10
	ble	cr1,.Ldo_tail
	ld	r0,8(r4)
	srd	r7,r0,r11
	or	r9,r7,r9
	b	.Ldo_tail

.Ldst_unaligned:
	mtcrf	0x01,r6		# put #bytes to 8B bdry into cr7
	subf	r5,r6,r5
	li	r7,0
	cmpldi	r1,r5,16
	bf	cr7*4+3,1f
	lbz	r0,0(r4)
	stb	r0,0(r3)
	addi	r7,r7,1
1:	bf	cr7*4+2,2f
	lhzx	r0,r7,r4
	sthx	r0,r7,r3
	addi	r7,r7,2
2:	bf	cr7*4+1,3f
	lwzx	r0,r7,r4
	stwx	r0,r7,r3
3:	mtcrf	0x01,r5
	add	r4,r6,r4
	add	r3,r6,r3
	b	.Ldst_aligned

.Lshort_copy:
	bf	cr7*4+0,1f
	lwz	r0,0(r4)
	lwz	r9,4(r4)
	addi	r4,r4,8
	stw	r0,0(r3)
	stw	r9,4(r3)
	addi	r3,r3,8
1:	bf	cr7*4+1,2f
	lwz	r0,0(r4)
	addi	r4,r4,4
	stw	r0,0(r3)
	addi	r3,r3,4
2:	bf	cr7*4+2,3f
	lhz	r0,0(r4)
	addi	r4,r4,2
	sth	r0,0(r3)
	addi	r3,r3,2
3:	bf	cr7*4+3,4f
	lbz	r0,0(r4)
	stb	r0,0(r3)
4:	ld	r3,48(r1)	/* return dest pointer */
	blr
OpenPOWER on IntegriCloud