about summary refs log tree commit diff
path: root/sysdeps/x86_64/multiarch/memcpy-sse2-unaligned.S
blob: efdfea238f8ac9c42e17d23cfd4bb797389ae0c3 (plain) (blame)
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
/* memcpy with unaliged loads
   Copyright (C) 2013 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"

#ifndef ALIGN
# define ALIGN(n)	.p2align n
#endif


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
	ALIGN(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
	ALIGN(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
	ALIGN(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)