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
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
/* wcschr with SSE2, without using bsf instructions
Copyright (C) 2011-2020 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
<https://www.gnu.org/licenses/>. */
#if IS_IN (libc)
# include <sysdep.h>
# define CFI_PUSH(REG) \
cfi_adjust_cfa_offset (4); \
cfi_rel_offset (REG, 0)
# define CFI_POP(REG) \
cfi_adjust_cfa_offset (-4); \
cfi_restore (REG)
# define PUSH(REG) pushl REG; CFI_PUSH (REG)
# define POP(REG) popl REG; CFI_POP (REG)
# define PARMS 4
# define STR1 PARMS
# define STR2 STR1+4
atom_text_section
ENTRY (__wcschr_sse2)
mov STR1(%esp), %ecx
movd STR2(%esp), %xmm1
mov %ecx, %eax
punpckldq %xmm1, %xmm1
pxor %xmm2, %xmm2
punpckldq %xmm1, %xmm1
and $63, %eax
cmp $48, %eax
ja L(cross_cache)
movdqu (%ecx), %xmm0
pcmpeqd %xmm0, %xmm2
pcmpeqd %xmm1, %xmm0
pmovmskb %xmm2, %edx
pmovmskb %xmm0, %eax
or %eax, %edx
jnz L(matches)
and $-16, %ecx
jmp L(loop)
.p2align 4
L(cross_cache):
PUSH (%edi)
mov %ecx, %edi
mov %eax, %ecx
and $-16, %edi
and $15, %ecx
movdqa (%edi), %xmm0
pcmpeqd %xmm0, %xmm2
pcmpeqd %xmm1, %xmm0
pmovmskb %xmm2, %edx
pmovmskb %xmm0, %eax
sarl %cl, %edx
sarl %cl, %eax
test %eax, %eax
jz L(unaligned_no_match)
add %edi, %ecx
POP (%edi)
test %edx, %edx
jz L(match_case1)
test %al, %al
jz L(match_higth_case2)
test $15, %al
jnz L(match_case2_4)
test $15, %dl
jnz L(return_null)
lea 4(%ecx), %eax
ret
CFI_PUSH (%edi)
.p2align 4
L(unaligned_no_match):
mov %edi, %ecx
POP (%edi)
test %edx, %edx
jnz L(return_null)
pxor %xmm2, %xmm2
/* Loop start on aligned string. */
.p2align 4
L(loop):
add $16, %ecx
movdqa (%ecx), %xmm0
pcmpeqd %xmm0, %xmm2
pcmpeqd %xmm1, %xmm0
pmovmskb %xmm2, %edx
pmovmskb %xmm0, %eax
or %eax, %edx
jnz L(matches)
add $16, %ecx
movdqa (%ecx), %xmm0
pcmpeqd %xmm0, %xmm2
pcmpeqd %xmm1, %xmm0
pmovmskb %xmm2, %edx
pmovmskb %xmm0, %eax
or %eax, %edx
jnz L(matches)
add $16, %ecx
movdqa (%ecx), %xmm0
pcmpeqd %xmm0, %xmm2
pcmpeqd %xmm1, %xmm0
pmovmskb %xmm2, %edx
pmovmskb %xmm0, %eax
or %eax, %edx
jnz L(matches)
add $16, %ecx
movdqa (%ecx), %xmm0
pcmpeqd %xmm0, %xmm2
pcmpeqd %xmm1, %xmm0
pmovmskb %xmm2, %edx
pmovmskb %xmm0, %eax
or %eax, %edx
jz L(loop)
.p2align 4
L(matches):
pmovmskb %xmm2, %edx
test %eax, %eax
jz L(return_null)
test %edx, %edx
jz L(match_case1)
.p2align 4
L(match_case2):
test %al, %al
jz L(match_higth_case2)
test $15, %al
jnz L(match_case2_4)
test $15, %dl
jnz L(return_null)
lea 4(%ecx), %eax
ret
.p2align 4
L(match_case2_4):
mov %ecx, %eax
ret
.p2align 4
L(match_higth_case2):
test %dl, %dl
jnz L(return_null)
test $15, %ah
jnz L(match_case2_12)
test $15, %dh
jnz L(return_null)
lea 12(%ecx), %eax
ret
.p2align 4
L(match_case2_12):
lea 8(%ecx), %eax
ret
.p2align 4
L(match_case1):
test %al, %al
jz L(match_higth_case1)
test $0x01, %al
jnz L(exit0)
lea 4(%ecx), %eax
ret
.p2align 4
L(match_higth_case1):
test $0x01, %ah
jnz L(exit3)
lea 12(%ecx), %eax
ret
.p2align 4
L(exit0):
mov %ecx, %eax
ret
.p2align 4
L(exit3):
lea 8(%ecx), %eax
ret
.p2align 4
L(return_null):
xor %eax, %eax
ret
END (__wcschr_sse2)
#endif
|
