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
181
182
183
184
185
186
187
188
| // Copyright 2016 The Go Authors. All rights reserved.
| // Use of this source code is governed by a BSD-style
| // license that can be found in the LICENSE file.
|
| #include "textflag.h"
|
| // func memmove(to, from unsafe.Pointer, n uintptr)
| TEXT runtime·memmove(SB),NOSPLIT|NOFRAME,$0-24
| MOVD to+0(FP), R6
| MOVD from+8(FP), R4
| MOVD n+16(FP), R5
|
| CMPBEQ R6, R4, done
|
| start:
| CMPBLE R5, $3, move0to3
| CMPBLE R5, $7, move4to7
| CMPBLE R5, $11, move8to11
| CMPBLE R5, $15, move12to15
| CMPBNE R5, $16, movemt16
| MOVD 0(R4), R7
| MOVD 8(R4), R8
| MOVD R7, 0(R6)
| MOVD R8, 8(R6)
| RET
|
| movemt16:
| CMPBGT R4, R6, forwards
| ADD R5, R4, R7
| CMPBLE R7, R6, forwards
| ADD R5, R6, R8
| backwards:
| MOVD -8(R7), R3
| MOVD R3, -8(R8)
| MOVD -16(R7), R3
| MOVD R3, -16(R8)
| ADD $-16, R5
| ADD $-16, R7
| ADD $-16, R8
| CMP R5, $16
| BGE backwards
| BR start
|
| forwards:
| CMPBGT R5, $64, forwards_fast
| MOVD 0(R4), R3
| MOVD R3, 0(R6)
| MOVD 8(R4), R3
| MOVD R3, 8(R6)
| ADD $16, R4
| ADD $16, R6
| ADD $-16, R5
| CMP R5, $16
| BGE forwards
| BR start
|
| forwards_fast:
| CMP R5, $256
| BLE forwards_small
| MVC $256, 0(R4), 0(R6)
| ADD $256, R4
| ADD $256, R6
| ADD $-256, R5
| BR forwards_fast
|
| forwards_small:
| CMPBEQ R5, $0, done
| ADD $-1, R5
| EXRL $runtime·memmove_s390x_exrl_mvc(SB), R5
| RET
|
| move0to3:
| CMPBEQ R5, $0, done
| move1:
| CMPBNE R5, $1, move2
| MOVB 0(R4), R3
| MOVB R3, 0(R6)
| RET
| move2:
| CMPBNE R5, $2, move3
| MOVH 0(R4), R3
| MOVH R3, 0(R6)
| RET
| move3:
| MOVH 0(R4), R3
| MOVB 2(R4), R7
| MOVH R3, 0(R6)
| MOVB R7, 2(R6)
| RET
|
| move4to7:
| CMPBNE R5, $4, move5
| MOVW 0(R4), R3
| MOVW R3, 0(R6)
| RET
| move5:
| CMPBNE R5, $5, move6
| MOVW 0(R4), R3
| MOVB 4(R4), R7
| MOVW R3, 0(R6)
| MOVB R7, 4(R6)
| RET
| move6:
| CMPBNE R5, $6, move7
| MOVW 0(R4), R3
| MOVH 4(R4), R7
| MOVW R3, 0(R6)
| MOVH R7, 4(R6)
| RET
| move7:
| MOVW 0(R4), R3
| MOVH 4(R4), R7
| MOVB 6(R4), R8
| MOVW R3, 0(R6)
| MOVH R7, 4(R6)
| MOVB R8, 6(R6)
| RET
|
| move8to11:
| CMPBNE R5, $8, move9
| MOVD 0(R4), R3
| MOVD R3, 0(R6)
| RET
| move9:
| CMPBNE R5, $9, move10
| MOVD 0(R4), R3
| MOVB 8(R4), R7
| MOVD R3, 0(R6)
| MOVB R7, 8(R6)
| RET
| move10:
| CMPBNE R5, $10, move11
| MOVD 0(R4), R3
| MOVH 8(R4), R7
| MOVD R3, 0(R6)
| MOVH R7, 8(R6)
| RET
| move11:
| MOVD 0(R4), R3
| MOVH 8(R4), R7
| MOVB 10(R4), R8
| MOVD R3, 0(R6)
| MOVH R7, 8(R6)
| MOVB R8, 10(R6)
| RET
|
| move12to15:
| CMPBNE R5, $12, move13
| MOVD 0(R4), R3
| MOVW 8(R4), R7
| MOVD R3, 0(R6)
| MOVW R7, 8(R6)
| RET
| move13:
| CMPBNE R5, $13, move14
| MOVD 0(R4), R3
| MOVW 8(R4), R7
| MOVB 12(R4), R8
| MOVD R3, 0(R6)
| MOVW R7, 8(R6)
| MOVB R8, 12(R6)
| RET
| move14:
| CMPBNE R5, $14, move15
| MOVD 0(R4), R3
| MOVW 8(R4), R7
| MOVH 12(R4), R8
| MOVD R3, 0(R6)
| MOVW R7, 8(R6)
| MOVH R8, 12(R6)
| RET
| move15:
| MOVD 0(R4), R3
| MOVW 8(R4), R7
| MOVH 12(R4), R8
| MOVB 14(R4), R10
| MOVD R3, 0(R6)
| MOVW R7, 8(R6)
| MOVH R8, 12(R6)
| MOVB R10, 14(R6)
| done:
| RET
|
| // DO NOT CALL - target for exrl (execute relative long) instruction.
| TEXT runtime·memmove_s390x_exrl_mvc(SB),NOSPLIT|NOFRAME,$0-0
| MVC $1, 0(R4), 0(R6)
| MOVD R0, 0(R0)
| RET
|
|
