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
|
/* memcpy with unaliged loads
Copyright (C) 2013-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <sysdep.h>
#include "asm-syntax.h"
ENTRY(__memcpy_sse2_unaligned)
movq %rsi, %rax
leaq (%rdx,%rdx), %rcx
subq %rdi, %rax
subq %rdx, %rax
cmpq %rcx, %rax
jb L(overlapping)
cmpq $16, %rdx
jbe L(less_16)
movdqu (%rsi), %xmm8
cmpq $32, %rdx
movdqu %xmm8, (%rdi)
movdqu -16(%rsi,%rdx), %xmm8
movdqu %xmm8, -16(%rdi,%rdx)
ja .L31
L(return):
movq %rdi, %rax
ret
.p2align 4,,10
.p2align 4
.L31:
movdqu 16(%rsi), %xmm8
cmpq $64, %rdx
movdqu %xmm8, 16(%rdi)
movdqu -32(%rsi,%rdx), %xmm8
movdqu %xmm8, -32(%rdi,%rdx)
jbe L(return)
movdqu 32(%rsi), %xmm8
cmpq $128, %rdx
movdqu %xmm8, 32(%rdi)
movdqu -48(%rsi,%rdx), %xmm8
movdqu %xmm8, -48(%rdi,%rdx)
movdqu 48(%rsi), %xmm8
movdqu %xmm8, 48(%rdi)
movdqu -64(%rsi,%rdx), %xmm8
movdqu %xmm8, -64(%rdi,%rdx)
jbe L(return)
leaq 64(%rdi), %rcx
addq %rdi, %rdx
andq $-64, %rdx
andq $-64, %rcx
movq %rcx, %rax
subq %rdi, %rax
addq %rax, %rsi
cmpq %rdx, %rcx
je L(return)
movq %rsi, %r10
subq %rcx, %r10
leaq 16(%r10), %r9
leaq 32(%r10), %r8
leaq 48(%r10), %rax
.p2align 4,,10
.p2align 4
L(loop):
movdqu (%rcx,%r10), %xmm8
movdqa %xmm8, (%rcx)
movdqu (%rcx,%r9), %xmm8
movdqa %xmm8, 16(%rcx)
movdqu (%rcx,%r8), %xmm8
movdqa %xmm8, 32(%rcx)
movdqu (%rcx,%rax), %xmm8
movdqa %xmm8, 48(%rcx)
addq $64, %rcx
cmpq %rcx, %rdx
jne L(loop)
jmp L(return)
L(overlapping):
cmpq %rsi, %rdi
jae .L3
testq %rdx, %rdx
.p2align 4,,5
je L(return)
movq %rdx, %r9
leaq 16(%rsi), %rcx
leaq 16(%rdi), %r8
shrq $4, %r9
movq %r9, %rax
salq $4, %rax
cmpq %rcx, %rdi
setae %cl
cmpq %r8, %rsi
setae %r8b
orl %r8d, %ecx
cmpq $15, %rdx
seta %r8b
testb %r8b, %cl
je .L16
testq %rax, %rax
je .L16
xorl %ecx, %ecx
xorl %r8d, %r8d
.L7:
movdqu (%rsi,%rcx), %xmm8
addq $1, %r8
movdqu %xmm8, (%rdi,%rcx)
addq $16, %rcx
cmpq %r8, %r9
ja .L7
cmpq %rax, %rdx
je L(return)
.L21:
movzbl (%rsi,%rax), %ecx
movb %cl, (%rdi,%rax)
addq $1, %rax
cmpq %rax, %rdx
ja .L21
jmp L(return)
L(less_16):
testb $24, %dl
jne L(between_9_16)
testb $4, %dl
.p2align 4,,5
jne L(between_5_8)
testq %rdx, %rdx
.p2align 4,,2
je L(return)
movzbl (%rsi), %eax
testb $2, %dl
movb %al, (%rdi)
je L(return)
movzwl -2(%rsi,%rdx), %eax
movw %ax, -2(%rdi,%rdx)
jmp L(return)
.L3:
leaq -1(%rdx), %rax
.p2align 4,,10
.p2align 4
.L11:
movzbl (%rsi,%rax), %edx
movb %dl, (%rdi,%rax)
subq $1, %rax
jmp .L11
L(between_9_16):
movq (%rsi), %rax
movq %rax, (%rdi)
movq -8(%rsi,%rdx), %rax
movq %rax, -8(%rdi,%rdx)
jmp L(return)
.L16:
xorl %eax, %eax
jmp .L21
L(between_5_8):
movl (%rsi), %eax
movl %eax, (%rdi)
movl -4(%rsi,%rdx), %eax
movl %eax, -4(%rdi,%rdx)
jmp L(return)
END(__memcpy_sse2_unaligned)
|
