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
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
|
/* strrchr with SSE2 with bsf and bsr
Copyright (C) 2011-2019 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 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
.text
ENTRY (__strrchr_sse2_bsf)
mov STR1(%esp), %ecx
movd STR2(%esp), %xmm1
PUSH (%edi)
pxor %xmm2, %xmm2
mov %ecx, %edi
punpcklbw %xmm1, %xmm1
punpcklbw %xmm1, %xmm1
/* ECX has OFFSET. */
and $63, %ecx
cmp $48, %ecx
pshufd $0, %xmm1, %xmm1
ja L(crosscashe)
/* unaligned string. */
movdqu (%edi), %xmm0
pcmpeqb %xmm0, %xmm2
pcmpeqb %xmm1, %xmm0
/* Find where NULL is. */
pmovmskb %xmm2, %edx
/* Check if there is a match. */
pmovmskb %xmm0, %eax
test %eax, %eax
jnz L(unaligned_match1)
test %edx, %edx
jnz L(return_null)
and $-16, %edi
add $16, %edi
PUSH (%esi)
PUSH (%ebx)
xor %ebx, %ebx
jmp L(loop)
CFI_POP (%esi)
CFI_POP (%ebx)
.p2align 4
L(unaligned_return_value1):
bsf %edx, %ecx
mov $2, %edx
shl %cl, %edx
sub $1, %edx
and %edx, %eax
jz L(return_null)
bsr %eax, %eax
add %edi, %eax
POP (%edi)
ret
CFI_PUSH (%edi)
.p2align 4
L(unaligned_match1):
test %edx, %edx
jnz L(unaligned_return_value1)
PUSH (%esi)
PUSH (%ebx)
mov %eax, %ebx
lea 16(%edi), %esi
and $-16, %edi
add $16, %edi
jmp L(loop)
CFI_POP (%esi)
CFI_POP (%ebx)
.p2align 4
L(crosscashe):
/* Hancle unaligned string. */
and $15, %ecx
and $-16, %edi
pxor %xmm3, %xmm3
movdqa (%edi), %xmm0
pcmpeqb %xmm0, %xmm3
pcmpeqb %xmm1, %xmm0
/* Find where NULL is. */
pmovmskb %xmm3, %edx
/* Check if there is a match. */
pmovmskb %xmm0, %eax
/* Remove the leading bytes. */
shr %cl, %edx
shr %cl, %eax
test %eax, %eax
jnz L(unaligned_match)
test %edx, %edx
jnz L(return_null)
add $16, %edi
PUSH (%esi)
PUSH (%ebx)
xor %ebx, %ebx
jmp L(loop)
CFI_POP (%esi)
CFI_POP (%ebx)
.p2align 4
L(unaligned_return_value):
add %ecx, %edi
bsf %edx, %ecx
mov $2, %edx
shl %cl, %edx
sub $1, %edx
and %edx, %eax
jz L(return_null)
bsr %eax, %eax
add %edi, %eax
POP (%edi)
ret
CFI_PUSH (%edi)
.p2align 4
L(unaligned_match):
test %edx, %edx
jnz L(unaligned_return_value)
PUSH (%esi)
PUSH (%ebx)
mov %eax, %ebx
add $16, %edi
lea (%edi, %ecx), %esi
/* Loop start on aligned string. */
.p2align 4
L(loop):
movdqa (%edi), %xmm0
pcmpeqb %xmm0, %xmm2
add $16, %edi
pcmpeqb %xmm1, %xmm0
pmovmskb %xmm2, %ecx
pmovmskb %xmm0, %eax
or %eax, %ecx
jnz L(matches)
movdqa (%edi), %xmm0
pcmpeqb %xmm0, %xmm2
add $16, %edi
pcmpeqb %xmm1, %xmm0
pmovmskb %xmm2, %ecx
pmovmskb %xmm0, %eax
or %eax, %ecx
jnz L(matches)
movdqa (%edi), %xmm0
pcmpeqb %xmm0, %xmm2
add $16, %edi
pcmpeqb %xmm1, %xmm0
pmovmskb %xmm2, %ecx
pmovmskb %xmm0, %eax
or %eax, %ecx
jnz L(matches)
movdqa (%edi), %xmm0
pcmpeqb %xmm0, %xmm2
add $16, %edi
pcmpeqb %xmm1, %xmm0
pmovmskb %xmm2, %ecx
pmovmskb %xmm0, %eax
or %eax, %ecx
jz L(loop)
L(matches):
test %eax, %eax
jnz L(match)
L(return_value):
test %ebx, %ebx
jz L(return_null_1)
bsr %ebx, %eax
add %esi, %eax
POP (%ebx)
POP (%esi)
sub $16, %eax
POP (%edi)
ret
CFI_PUSH (%edi)
CFI_PUSH (%ebx)
CFI_PUSH (%esi)
.p2align 4
L(match):
pmovmskb %xmm2, %ecx
test %ecx, %ecx
jnz L(return_value_1)
mov %eax, %ebx
mov %edi, %esi
jmp L(loop)
.p2align 4
L(return_value_1):
bsf %ecx, %ecx
mov $2, %edx
shl %cl, %edx
sub $1, %edx
and %edx, %eax
jz L(return_value)
POP (%ebx)
POP (%esi)
bsr %eax, %eax
add %edi, %eax
sub $16, %eax
POP (%edi)
ret
CFI_PUSH (%edi)
/* Return NULL. */
.p2align 4
L(return_null):
xor %eax, %eax
POP (%edi)
ret
CFI_PUSH (%edi)
CFI_PUSH (%ebx)
CFI_PUSH (%esi)
/* Return NULL. */
.p2align 4
L(return_null_1):
POP (%ebx)
POP (%esi)
POP (%edi)
xor %eax, %eax
ret
END (__strrchr_sse2_bsf)
#endif
|
GitWeb