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
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
|
/* strchr SSE2 without bsf
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/>. */
#ifndef NOT_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 8
# define ENTRANCE PUSH(%edi)
# define RETURN POP(%edi); ret; CFI_PUSH(%edi);
# define STR1 PARMS
# define STR2 STR1+4
atom_text_section
ENTRY (__strchr_sse2)
ENTRANCE
mov STR1(%esp), %ecx
movd STR2(%esp), %xmm1
pxor %xmm2, %xmm2
mov %ecx, %edi
punpcklbw %xmm1, %xmm1
punpcklbw %xmm1, %xmm1
/* ECX has OFFSET. */
and $15, %ecx
pshufd $0, %xmm1, %xmm1
je L(loop)
/* Handle unaligned string. */
and $-16, %edi
movdqa (%edi), %xmm0
pcmpeqb %xmm0, %xmm2
pcmpeqb %xmm1, %xmm0
/* Find where NULL is. */
pmovmskb %xmm2, %edx
/* Check if there is a match. */
pmovmskb %xmm0, %eax
/* Remove the leading bytes. */
sarl %cl, %edx
sarl %cl, %eax
test %eax, %eax
jz L(unaligned_no_match)
/* Check which byte is a match. */
/* Is there a NULL? */
add %ecx, %edi
test %edx, %edx
jz L(match_case1)
jmp L(match_case2)
.p2align 4
L(unaligned_no_match):
test %edx, %edx
jne L(return_null)
pxor %xmm2, %xmm2
add $16, %edi
.p2align 4
/* Loop start on aligned string. */
L(loop):
movdqa (%edi), %xmm0
pcmpeqb %xmm0, %xmm2
pcmpeqb %xmm1, %xmm0
pmovmskb %xmm2, %edx
pmovmskb %xmm0, %eax
test %eax, %eax
jnz L(matches)
test %edx, %edx
jnz L(return_null)
add $16, %edi
movdqa (%edi), %xmm0
pcmpeqb %xmm0, %xmm2
pcmpeqb %xmm1, %xmm0
pmovmskb %xmm2, %edx
pmovmskb %xmm0, %eax
test %eax, %eax
jnz L(matches)
test %edx, %edx
jnz L(return_null)
add $16, %edi
movdqa (%edi), %xmm0
pcmpeqb %xmm0, %xmm2
pcmpeqb %xmm1, %xmm0
pmovmskb %xmm2, %edx
pmovmskb %xmm0, %eax
test %eax, %eax
jnz L(matches)
test %edx, %edx
jnz L(return_null)
add $16, %edi
movdqa (%edi), %xmm0
pcmpeqb %xmm0, %xmm2
pcmpeqb %xmm1, %xmm0
pmovmskb %xmm2, %edx
pmovmskb %xmm0, %eax
test %eax, %eax
jnz L(matches)
test %edx, %edx
jnz L(return_null)
add $16, %edi
jmp L(loop)
L(matches):
/* There is a match. First find where NULL is. */
test %edx, %edx
jz L(match_case1)
.p2align 4
L(match_case2):
test %al, %al
jz L(match_higth_case2)
mov %al, %cl
and $15, %cl
jnz L(match_case2_4)
mov %dl, %ch
and $15, %ch
jnz L(return_null)
test $0x10, %al
jnz L(Exit5)
test $0x10, %dl
jnz L(return_null)
test $0x20, %al
jnz L(Exit6)
test $0x20, %dl
jnz L(return_null)
test $0x40, %al
jnz L(Exit7)
test $0x40, %dl
jnz L(return_null)
lea 7(%edi), %eax
RETURN
.p2align 4
L(match_case2_4):
test $0x01, %al
jnz L(Exit1)
test $0x01, %dl
jnz L(return_null)
test $0x02, %al
jnz L(Exit2)
test $0x02, %dl
jnz L(return_null)
test $0x04, %al
jnz L(Exit3)
test $0x04, %dl
jnz L(return_null)
lea 3(%edi), %eax
RETURN
.p2align 4
L(match_higth_case2):
test %dl, %dl
jnz L(return_null)
mov %ah, %cl
and $15, %cl
jnz L(match_case2_12)
mov %dh, %ch
and $15, %ch
jnz L(return_null)
test $0x10, %ah
jnz L(Exit13)
test $0x10, %dh
jnz L(return_null)
test $0x20, %ah
jnz L(Exit14)
test $0x20, %dh
jnz L(return_null)
test $0x40, %ah
jnz L(Exit15)
test $0x40, %dh
jnz L(return_null)
lea 15(%edi), %eax
RETURN
.p2align 4
L(match_case2_12):
test $0x01, %ah
jnz L(Exit9)
test $0x01, %dh
jnz L(return_null)
test $0x02, %ah
jnz L(Exit10)
test $0x02, %dh
jnz L(return_null)
test $0x04, %ah
jnz L(Exit11)
test $0x04, %dh
jnz L(return_null)
lea 11(%edi), %eax
RETURN
.p2align 4
L(match_case1):
test %al, %al
jz L(match_higth_case1)
test $0x01, %al
jnz L(Exit1)
test $0x02, %al
jnz L(Exit2)
test $0x04, %al
jnz L(Exit3)
test $0x08, %al
jnz L(Exit4)
test $0x10, %al
jnz L(Exit5)
test $0x20, %al
jnz L(Exit6)
test $0x40, %al
jnz L(Exit7)
lea 7(%edi), %eax
RETURN
.p2align 4
L(match_higth_case1):
test $0x01, %ah
jnz L(Exit9)
test $0x02, %ah
jnz L(Exit10)
test $0x04, %ah
jnz L(Exit11)
test $0x08, %ah
jnz L(Exit12)
test $0x10, %ah
jnz L(Exit13)
test $0x20, %ah
jnz L(Exit14)
test $0x40, %ah
jnz L(Exit15)
lea 15(%edi), %eax
RETURN
.p2align 4
L(Exit1):
lea (%edi), %eax
RETURN
.p2align 4
L(Exit2):
lea 1(%edi), %eax
RETURN
.p2align 4
L(Exit3):
lea 2(%edi), %eax
RETURN
.p2align 4
L(Exit4):
lea 3(%edi), %eax
RETURN
.p2align 4
L(Exit5):
lea 4(%edi), %eax
RETURN
.p2align 4
L(Exit6):
lea 5(%edi), %eax
RETURN
.p2align 4
L(Exit7):
lea 6(%edi), %eax
RETURN
.p2align 4
L(Exit9):
lea 8(%edi), %eax
RETURN
.p2align 4
L(Exit10):
lea 9(%edi), %eax
RETURN
.p2align 4
L(Exit11):
lea 10(%edi), %eax
RETURN
.p2align 4
L(Exit12):
lea 11(%edi), %eax
RETURN
.p2align 4
L(Exit13):
lea 12(%edi), %eax
RETURN
.p2align 4
L(Exit14):
lea 13(%edi), %eax
RETURN
.p2align 4
L(Exit15):
lea 14(%edi), %eax
RETURN
/* Return NULL. */
.p2align 4
L(return_null):
xor %eax, %eax
RETURN
END (__strchr_sse2)
#endif
|
