aboutsummaryrefslogtreecommitdiff
path: root/sysdeps/x86_64/wcsrchr.S
blob: c2e4b7e97a4b5050a8d9f90b20cb583765de9975 (plain)
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
/* wcsrchr with SSSE3
   Copyright (C) 2011 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, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <sysdep.h>

	.text
ENTRY (wcsrchr)

	movd	%rsi, %xmm1
	mov	%rdi, %rcx
	punpckldq %xmm1, %xmm1
	pxor	%xmm2, %xmm2
	punpckldq %xmm1, %xmm1
	and	$63, %rcx
	cmp	$48, %rcx
	ja	L(crosscache)

	movdqu	(%rdi), %xmm0
	pcmpeqd	%xmm0, %xmm2
	pcmpeqd	%xmm1, %xmm0
	pmovmskb %xmm2, %rcx
	pmovmskb %xmm0, %rax
	add	$16, %rdi

	test	%rax, %rax
	jnz	L(unaligned_match1)

	test	%rcx, %rcx
	jnz	L(return_null)

	and	$-16, %rdi
	xor	%r8, %r8
	jmp	L(loop)

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

	mov	%rax, %r8
	mov	%rdi, %rsi
	and	$-16, %rdi
	jmp	L(loop)

	.p2align 4
L(crosscache):
	and	$15, %rcx
	and	$-16, %rdi
	pxor	%xmm3, %xmm3
	movdqa	(%rdi), %xmm0
	pcmpeqd	%xmm0, %xmm3
	pcmpeqd	%xmm1, %xmm0
	pmovmskb %xmm3, %rdx
	pmovmskb %xmm0, %rax
	shr	%cl, %rdx
	shr	%cl, %rax
	add	$16, %rdi

	test	%rax, %rax
	jnz	L(unaligned_match)

	test	%rdx, %rdx
	jnz	L(return_null)

	xor	%r8, %r8
	jmp	L(loop)

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

	mov	%rax, %r8
	lea	(%rdi, %rcx), %rsi

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

	movdqa	(%rdi), %xmm3
	pcmpeqd	%xmm3, %xmm2
	add	$16, %rdi
	pcmpeqd	%xmm1, %xmm3
	pmovmskb %xmm2, %rcx
	pmovmskb %xmm3, %rax
	or	%rax, %rcx
	jnz	L(matches)

	movdqa	(%rdi), %xmm4
	pcmpeqd	%xmm4, %xmm2
	add	$16, %rdi
	pcmpeqd	%xmm1, %xmm4
	pmovmskb %xmm2, %rcx
	pmovmskb %xmm4, %rax
	or	%rax, %rcx
	jnz	L(matches)

	movdqa	(%rdi), %xmm5
	pcmpeqd	%xmm5, %xmm2
	add	$16, %rdi
	pcmpeqd	%xmm1, %xmm5
	pmovmskb %xmm2, %rcx
	pmovmskb %xmm5, %rax
	or	%rax, %rcx
	jz	L(loop)

	.p2align 4
L(matches):
	test	%rax, %rax
	jnz	L(match)
L(return_value):
	test	%r8, %r8
	jz	L(return_null)
	mov	%r8, %rax
	mov	%rsi, %rdi

	test	$15 << 4, %ah
	jnz	L(match_fourth_wchar)
	test	%ah, %ah
	jnz	L(match_third_wchar)
	test	$15 << 4, %al
	jnz	L(match_second_wchar)
	lea	-16(%rdi), %rax
	ret

	.p2align 4
L(match):
	pmovmskb %xmm2, %rcx
	test	%rcx, %rcx
	jnz	L(find_zero)
	mov	%rax, %r8
	mov	%rdi, %rsi
	jmp	L(loop)

	.p2align 4
L(find_zero):
	test	$15, %cl
	jnz	L(find_zero_in_first_wchar)
	test	%cl, %cl
	jnz	L(find_zero_in_second_wchar)
	test	$15, %ch
	jnz	L(find_zero_in_third_wchar)

	and	$1 << 13 - 1, %rax
	jz	L(return_value)

	test	$15 << 4, %ah
	jnz	L(match_fourth_wchar)
	test	%ah, %ah
	jnz	L(match_third_wchar)
	test	$15 << 4, %al
	jnz	L(match_second_wchar)
	lea	-16(%rdi), %rax
	ret

	.p2align 4
L(find_zero_in_first_wchar):
	test	$1, %rax
	jz	L(return_value)
	lea	-16(%rdi), %rax
	ret

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

	test	$15 << 4, %al
	jnz	L(match_second_wchar)
	lea	-16(%rdi), %rax
	ret

	.p2align 4
L(find_zero_in_third_wchar):
	and	$1 << 9 - 1, %rax
	jz	L(return_value)

	test	%ah, %ah
	jnz	L(match_third_wchar)
	test	$15 << 4, %al
	jnz	L(match_second_wchar)
	lea	-16(%rdi), %rax
	ret

	.p2align 4
L(prolog_find_zero):
	add	%rcx, %rdi
	mov     %rdx, %rcx
L(prolog_find_zero_1):
	test	$15, %cl
	jnz	L(prolog_find_zero_in_first_wchar)
	test	%cl, %cl
	jnz	L(prolog_find_zero_in_second_wchar)
	test	$15, %ch
	jnz	L(prolog_find_zero_in_third_wchar)

	and	$1 << 13 - 1, %rax
	jz	L(return_null)

	test	$15 << 4, %ah
	jnz	L(match_fourth_wchar)
	test	%ah, %ah
	jnz	L(match_third_wchar)
	test	$15 << 4, %al
	jnz	L(match_second_wchar)
	lea	-16(%rdi), %rax
	ret

	.p2align 4
L(prolog_find_zero_in_first_wchar):
	test	$1, %rax
	jz	L(return_null)
	lea	-16(%rdi), %rax
	ret

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

	test	$15 << 4, %al
	jnz	L(match_second_wchar)
	lea	-16(%rdi), %rax
	ret

	.p2align 4
L(prolog_find_zero_in_third_wchar):
	and	$1 << 9 - 1, %rax
	jz	L(return_null)

	test	%ah, %ah
	jnz	L(match_third_wchar)
	test	$15 << 4, %al
	jnz	L(match_second_wchar)
	lea	-16(%rdi), %rax
	ret

	.p2align 4
L(match_second_wchar):
	lea	-12(%rdi), %rax
	ret

	.p2align 4
L(match_third_wchar):
	lea	-8(%rdi), %rax
	ret

	.p2align 4
L(match_fourth_wchar):
	lea	-4(%rdi), %rax
	ret

	.p2align 4
L(return_null):
	xor	%rax, %rax
	ret

END (wcsrchr)