summaryrefslogtreecommitdiff
path: root/sysdeps/i386/i686/multiarch/wcslen-sse2.S
blob: 70b73b482571c4ccf341854647bd04eb19453464 (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
181
182
183
184
185
186
187
188
189
190
191
192
193
/* wcslen with SSE2
   Copyright (C) 2011-2014 Free Software Foundation, Inc.
   Contributed by Intel Corporation.
   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/>.  */

#if IS_IN (libc)
# include <sysdep.h>
# define STR	4

	.text
ENTRY (__wcslen_sse2)
	mov	STR(%esp), %edx

	cmp	$0, (%edx)
	jz	L(exit_tail0)
	cmp	$0, 4(%edx)
	jz	L(exit_tail1)
	cmp	$0, 8(%edx)
	jz	L(exit_tail2)
	cmp	$0, 12(%edx)
	jz	L(exit_tail3)
	cmp	$0, 16(%edx)
	jz	L(exit_tail4)
	cmp	$0, 20(%edx)
	jz	L(exit_tail5)
	cmp	$0, 24(%edx)
	jz	L(exit_tail6)
	cmp	$0, 28(%edx)
	jz	L(exit_tail7)

	pxor	%xmm0, %xmm0

	lea	32(%edx), %eax
	lea	16(%edx), %ecx
	and	$-16, %eax

	pcmpeqd	(%eax), %xmm0
	pmovmskb %xmm0, %edx
	pxor	%xmm1, %xmm1
	test	%edx, %edx
	lea	16(%eax), %eax
	jnz	L(exit)

	pcmpeqd	(%eax), %xmm1
	pmovmskb %xmm1, %edx
	pxor	%xmm2, %xmm2
	test	%edx, %edx
	lea	16(%eax), %eax
	jnz	L(exit)

	pcmpeqd	(%eax), %xmm2
	pmovmskb %xmm2, %edx
	pxor	%xmm3, %xmm3
	test	%edx, %edx
	lea	16(%eax), %eax
	jnz	L(exit)

	pcmpeqd	(%eax), %xmm3
	pmovmskb %xmm3, %edx
	test	%edx, %edx
	lea	16(%eax), %eax
	jnz	L(exit)

	and	$-0x40, %eax

	.p2align 4
L(aligned_64_loop):
	movaps	(%eax), %xmm0
	movaps	16(%eax), %xmm1
	movaps	32(%eax), %xmm2
	movaps	48(%eax), %xmm6

	pminub	%xmm1, %xmm0
	pminub	%xmm6, %xmm2
	pminub	%xmm0, %xmm2
	pcmpeqd	%xmm3, %xmm2
	pmovmskb %xmm2, %edx
	test	%edx, %edx
	lea	64(%eax), %eax
	jz	L(aligned_64_loop)

	pcmpeqd	-64(%eax), %xmm3
	pmovmskb %xmm3, %edx
	test	%edx, %edx
	lea	48(%ecx), %ecx
	jnz	L(exit)

	pcmpeqd	%xmm1, %xmm3
	pmovmskb %xmm3, %edx
	test	%edx, %edx
	lea	-16(%ecx), %ecx
	jnz	L(exit)

	pcmpeqd	-32(%eax), %xmm3
	pmovmskb %xmm3, %edx
	test	%edx, %edx
	lea	-16(%ecx), %ecx
	jnz	L(exit)

	pcmpeqd	%xmm6, %xmm3
	pmovmskb %xmm3, %edx
	test	%edx, %edx
	lea	-16(%ecx), %ecx
	jnz	L(exit)

	jmp	L(aligned_64_loop)

	.p2align 4
L(exit):
	sub	%ecx, %eax
	shr	$2, %eax
	test	%dl, %dl
	jz	L(exit_high)

	mov	%dl, %cl
	and	$15, %cl
	jz	L(exit_1)
	ret

	.p2align 4
L(exit_high):
	mov	%dh, %ch
	and	$15, %ch
	jz	L(exit_3)
	add	$2, %eax
	ret

	.p2align 4
L(exit_1):
	add	$1, %eax
	ret

	.p2align 4
L(exit_3):
	add	$3, %eax
	ret

	.p2align 4
L(exit_tail0):
	xor	%eax, %eax
	ret

	.p2align 4
L(exit_tail1):
	mov	$1, %eax
	ret

	.p2align 4
L(exit_tail2):
	mov	$2, %eax
	ret

	.p2align 4
L(exit_tail3):
	mov	$3, %eax
	ret

	.p2align 4
L(exit_tail4):
	mov	$4, %eax
	ret

	.p2align 4
L(exit_tail5):
	mov	$5, %eax
	ret

	.p2align 4
L(exit_tail6):
	mov	$6, %eax
	ret

	.p2align 4
L(exit_tail7):
	mov	$7, %eax
	ret

END (__wcslen_sse2)
#endif