about summary refs log tree commit diff
path: root/sysdeps/i386/i686/multiarch/strchr-sse2.S
blob: 4f387eaeead9c570f247e68b77a862c0aabbaaab (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
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) 2011-2015 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  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