summaryrefslogtreecommitdiff
path: root/sysdeps/x86_64/multiarch/strchr-sse2-no-bsf.S
blob: 05311964902c1b4bd22362296a81846926579301 (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
/* strchr with SSE2 without bsf
   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>
# include "asm-syntax.h"

	atom_text_section
ENTRY (__strchr_sse2_no_bsf)
	movd	%esi, %xmm1
	movq	%rdi, %rcx
	punpcklbw %xmm1, %xmm1
	andq	$~15, %rdi
	pxor	%xmm2, %xmm2
	punpcklbw %xmm1, %xmm1
	orl	$0xffffffff, %esi
	movdqa	(%rdi), %xmm0
	pshufd	$0, %xmm1, %xmm1
	subq	%rdi, %rcx
	movdqa	%xmm0, %xmm3
	leaq	16(%rdi), %rdi
	pcmpeqb	%xmm1, %xmm0
	pcmpeqb	%xmm2, %xmm3
	shl	%cl, %esi
	pmovmskb %xmm0, %eax
	pmovmskb %xmm3, %edx
	andl	%esi, %eax
	andl	%esi, %edx
	test	%eax, %eax
	jnz	L(matches)
	test	%edx, %edx
	jnz	L(return_null)

L(loop):
	movdqa	(%rdi), %xmm0
	leaq	16(%rdi), %rdi
	movdqa	%xmm0, %xmm3
	pcmpeqb	%xmm1, %xmm0
	pcmpeqb	%xmm2, %xmm3
	pmovmskb %xmm0, %eax
	pmovmskb %xmm3, %edx
	or	%eax, %edx
	jz	L(loop)

	pmovmskb %xmm3, %edx
	test	%eax, %eax
	jnz	L(matches)

/* Return NULL.  */
	.p2align 4
L(return_null):
	xor	%rax, %rax
	ret

L(matches):
	/* There is a match.  First find where NULL is.  */
	leaq	-16(%rdi), %rdi
	test	%edx, %edx
	jz	L(match_case1)

	.p2align 4
L(match_case2):
	test	%al, %al
	jz	L(match_high_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(%rdi), %rax
	ret

	.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(%rdi), %rax
	ret

	.p2align 4
L(match_high_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(%rdi), %rax
	ret

	.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(%rdi), %rax
	ret

	.p2align 4
L(match_case1):
	test	%al, %al
	jz	L(match_high_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(%rdi), %rax
	ret

	.p2align 4
L(match_high_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(%rdi), %rax
	ret

	.p2align 4
L(Exit1):
	lea	(%rdi), %rax
	ret

	.p2align 4
L(Exit2):
	lea	1(%rdi), %rax
	ret

	.p2align 4
L(Exit3):
	lea	2(%rdi), %rax
	ret

	.p2align 4
L(Exit4):
	lea	3(%rdi), %rax
	ret

	.p2align 4
L(Exit5):
	lea	4(%rdi), %rax
	ret

	.p2align 4
L(Exit6):
	lea	5(%rdi), %rax
	ret

	.p2align 4
L(Exit7):
	lea	6(%rdi), %rax
	ret

	.p2align 4
L(Exit9):
	lea	8(%rdi), %rax
	ret

	.p2align 4
L(Exit10):
	lea	9(%rdi), %rax
	ret

	.p2align 4
L(Exit11):
	lea	10(%rdi), %rax
	ret

	.p2align 4
L(Exit12):
	lea	11(%rdi), %rax
	ret

	.p2align 4
L(Exit13):
	lea	12(%rdi), %rax
	ret

	.p2align 4
L(Exit14):
	lea	13(%rdi), %rax
	ret

	.p2align 4
L(Exit15):
	lea	14(%rdi), %rax
	ret

END (__strchr_sse2_no_bsf)
#endif