about summary refs log tree commit diff
path: root/sysdeps/i386/i686/multiarch/wcsrchr-sse2.S
blob: 0e1b291c19064a896f2b78b515b8caab1b6e511d (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
349
350
351
352
353
354
/* wcsrchr with SSE2, without using bsf instructions.
   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 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 (__wcsrchr_sse2)

	ENTRANCE
	mov	STR1(%esp), %ecx
	movd	STR2(%esp), %xmm1

	mov	%ecx, %edi
	punpckldq %xmm1, %xmm1
	pxor	%xmm2, %xmm2
	punpckldq %xmm1, %xmm1

/* ECX has OFFSET. */
	and	$63, %ecx
	cmp	$48, %ecx
	ja	L(crosscache)

/* unaligned string. */
	movdqu	(%edi), %xmm0
	pcmpeqd	%xmm0, %xmm2
	pcmpeqd	%xmm1, %xmm0
/* Find where NULL is.  */
	pmovmskb %xmm2, %ecx
/* Check if there is a match.  */
	pmovmskb %xmm0, %eax
	add	$16, %edi

	test	%eax, %eax
	jnz	L(unaligned_match1)

	test	%ecx, %ecx
	jnz	L(return_null)

	and	$-16, %edi

	PUSH	(%esi)

	xor	%edx, %edx
	jmp	L(loop)

	CFI_POP	(%esi)

	.p2align 4
L(unaligned_match1):
	test	%ecx, %ecx
	jnz	L(prolog_find_zero_1)

	PUSH	(%esi)

/* Save current match */
	mov	%eax, %edx
	mov	%edi, %esi
	and	$-16, %edi
	jmp	L(loop)

	CFI_POP	(%esi)

	.p2align 4
L(crosscache):
/* Hancle unaligned string.  */
	and	$15, %ecx
	and	$-16, %edi
	pxor	%xmm3, %xmm3
	movdqa	(%edi), %xmm0
	pcmpeqd	%xmm0, %xmm3
	pcmpeqd	%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
	add	$16, %edi

	test	%eax, %eax
	jnz	L(unaligned_match)

	test	%edx, %edx
	jnz	L(return_null)

	PUSH	(%esi)

	xor	%edx, %edx
	jmp	L(loop)

	CFI_POP	(%esi)

	.p2align 4
L(unaligned_match):
	test	%edx, %edx
	jnz	L(prolog_find_zero)

	PUSH	(%esi)

	mov	%eax, %edx
	lea	(%edi, %ecx), %esi

/* Loop start on aligned string.  */
	.p2align 4
L(loop):
	movdqa	(%edi), %xmm0
	pcmpeqd	%xmm0, %xmm2
	add	$16, %edi
	pcmpeqd	%xmm1, %xmm0
	pmovmskb %xmm2, %ecx
	pmovmskb %xmm0, %eax
	or	%eax, %ecx
	jnz	L(matches)

	movdqa	(%edi), %xmm3
	pcmpeqd	%xmm3, %xmm2
	add	$16, %edi
	pcmpeqd	%xmm1, %xmm3
	pmovmskb %xmm2, %ecx
	pmovmskb %xmm3, %eax
	or	%eax, %ecx
	jnz	L(matches)

	movdqa	(%edi), %xmm4
	pcmpeqd	%xmm4, %xmm2
	add	$16, %edi
	pcmpeqd	%xmm1, %xmm4
	pmovmskb %xmm2, %ecx
	pmovmskb %xmm4, %eax
	or	%eax, %ecx
	jnz	L(matches)

	movdqa	(%edi), %xmm5
	pcmpeqd	%xmm5, %xmm2
	add	$16, %edi
	pcmpeqd	%xmm1, %xmm5
	pmovmskb %xmm2, %ecx
	pmovmskb %xmm5, %eax
	or	%eax, %ecx
	jz	L(loop)

	.p2align 4
L(matches):
	test	%eax, %eax
	jnz	L(match)
L(return_value):
	test	%edx, %edx
	jz	L(return_null_1)
	mov	%edx, %eax
	mov	%esi, %edi

	POP	(%esi)

	test	%ah, %ah
	jnz	L(match_third_or_fourth_wchar)
	test	$15 << 4, %al
	jnz	L(match_second_wchar)
	lea	-16(%edi), %eax
	RETURN

	CFI_PUSH	(%esi)

	.p2align 4
L(return_null_1):
	POP	(%esi)

	xor	%eax, %eax
	RETURN

	CFI_PUSH	(%esi)

	.p2align 4
L(match):
	pmovmskb %xmm2, %ecx
	test	%ecx, %ecx
	jnz	L(find_zero)
/* save match info */
	mov	%eax, %edx
	mov	%edi, %esi
	jmp	L(loop)

	.p2align 4
L(find_zero):
	test	%cl, %cl
	jz	L(find_zero_in_third_or_fourth_wchar)
	test	$15, %cl
	jz	L(find_zero_in_second_wchar)
	and	$1, %eax
	jz	L(return_value)

	POP	(%esi)

	lea	-16(%edi), %eax
	RETURN

	CFI_PUSH	(%esi)

	.p2align 4
L(find_zero_in_second_wchar):
	and	$1 << 5 - 1, %eax
	jz	L(return_value)

	POP	(%esi)

	test	$15 << 4, %al
	jnz	L(match_second_wchar)
	lea	-16(%edi), %eax
	RETURN

	CFI_PUSH	(%esi)

	.p2align 4
L(find_zero_in_third_or_fourth_wchar):
	test	$15, %ch
	jz	L(find_zero_in_fourth_wchar)
	and	$1 << 9 - 1, %eax
	jz	L(return_value)

	POP	(%esi)

	test	%ah, %ah
	jnz	L(match_third_wchar)
	test	$15 << 4, %al
	jnz	L(match_second_wchar)
	lea	-16(%edi), %eax
	RETURN

	CFI_PUSH	(%esi)

	.p2align 4
L(find_zero_in_fourth_wchar):

	POP	(%esi)

	test	%ah, %ah
	jnz	L(match_third_or_fourth_wchar)
	test	$15 << 4, %al
	jnz	L(match_second_wchar)
	lea	-16(%edi), %eax
	RETURN

	CFI_PUSH	(%esi)

	.p2align 4
L(match_second_wchar):
	lea	-12(%edi), %eax
	RETURN

	.p2align 4
L(match_third_or_fourth_wchar):
	test	$15 << 4, %ah
	jnz	L(match_fourth_wchar)
	lea	-8(%edi), %eax
	RETURN

	.p2align 4
L(match_third_wchar):
	lea	-8(%edi), %eax
	RETURN

	.p2align 4
L(match_fourth_wchar):
	lea	-4(%edi), %eax
	RETURN

	.p2align 4
L(return_null):
	xor	%eax, %eax
	RETURN

	.p2align 4
L(prolog_find_zero):
	add	%ecx, %edi
	mov     %edx, %ecx
L(prolog_find_zero_1):
	test	%cl, %cl
	jz	L(prolog_find_zero_in_third_or_fourth_wchar)
	test	$15, %cl
	jz	L(prolog_find_zero_in_second_wchar)
	and	$1, %eax
	jz	L(return_null)

	lea	-16(%edi), %eax
	RETURN

	.p2align 4
L(prolog_find_zero_in_second_wchar):
	and	$1 << 5 - 1, %eax
	jz	L(return_null)

	test	$15 << 4, %al
	jnz	L(match_second_wchar)
	lea	-16(%edi), %eax
	RETURN

	.p2align 4
L(prolog_find_zero_in_third_or_fourth_wchar):
	test	$15, %ch
	jz	L(prolog_find_zero_in_fourth_wchar)
	and	$1 << 9 - 1, %eax
	jz	L(return_null)

	test	%ah, %ah
	jnz	L(match_third_wchar)
	test	$15 << 4, %al
	jnz	L(match_second_wchar)
	lea	-16(%edi), %eax
	RETURN

	.p2align 4
L(prolog_find_zero_in_fourth_wchar):
	test	%ah, %ah
	jnz	L(match_third_or_fourth_wchar)
	test	$15 << 4, %al
	jnz	L(match_second_wchar)
	lea	-16(%edi), %eax
	RETURN

END (__wcsrchr_sse2)
#endif