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
|
/* strrchr (str, ch) -- Return pointer to last occurrence of CH in STR.
Copyright (C) 2013-2019 Free Software Foundation, Inc.
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
<https://www.gnu.org/licenses/>. */
#include <sysdep.h>
.text
ENTRY (strrchr)
movd %esi, %xmm1
movq %rdi, %rax
andl $4095, %eax
punpcklbw %xmm1, %xmm1
cmpq $4032, %rax
punpcklwd %xmm1, %xmm1
pshufd $0, %xmm1, %xmm1
ja L(cross_page)
movdqu (%rdi), %xmm0
pxor %xmm2, %xmm2
movdqa %xmm0, %xmm3
pcmpeqb %xmm1, %xmm0
pcmpeqb %xmm2, %xmm3
pmovmskb %xmm0, %ecx
pmovmskb %xmm3, %edx
testq %rdx, %rdx
je L(next_48_bytes)
leaq -1(%rdx), %rax
xorq %rdx, %rax
andq %rcx, %rax
je L(exit)
bsrq %rax, %rax
addq %rdi, %rax
ret
.p2align 4
L(next_48_bytes):
movdqu 16(%rdi), %xmm4
movdqa %xmm4, %xmm5
movdqu 32(%rdi), %xmm3
pcmpeqb %xmm1, %xmm4
pcmpeqb %xmm2, %xmm5
movdqu 48(%rdi), %xmm0
pmovmskb %xmm5, %edx
movdqa %xmm3, %xmm5
pcmpeqb %xmm1, %xmm3
pcmpeqb %xmm2, %xmm5
pcmpeqb %xmm0, %xmm2
salq $16, %rdx
pmovmskb %xmm3, %r8d
pmovmskb %xmm5, %eax
pmovmskb %xmm2, %esi
salq $32, %r8
salq $32, %rax
pcmpeqb %xmm1, %xmm0
orq %rdx, %rax
movq %rsi, %rdx
pmovmskb %xmm4, %esi
salq $48, %rdx
salq $16, %rsi
orq %r8, %rsi
orq %rcx, %rsi
pmovmskb %xmm0, %ecx
salq $48, %rcx
orq %rcx, %rsi
orq %rdx, %rax
je L(loop_header2)
leaq -1(%rax), %rcx
xorq %rax, %rcx
andq %rcx, %rsi
je L(exit)
bsrq %rsi, %rsi
leaq (%rdi,%rsi), %rax
ret
.p2align 4
L(loop_header2):
testq %rsi, %rsi
movq %rdi, %rcx
je L(no_c_found)
L(loop_header):
addq $64, %rdi
pxor %xmm7, %xmm7
andq $-64, %rdi
jmp L(loop_entry)
.p2align 4
L(loop64):
testq %rdx, %rdx
cmovne %rdx, %rsi
cmovne %rdi, %rcx
addq $64, %rdi
L(loop_entry):
movdqa 32(%rdi), %xmm3
pxor %xmm6, %xmm6
movdqa 48(%rdi), %xmm2
movdqa %xmm3, %xmm0
movdqa 16(%rdi), %xmm4
pminub %xmm2, %xmm0
movdqa (%rdi), %xmm5
pminub %xmm4, %xmm0
pminub %xmm5, %xmm0
pcmpeqb %xmm7, %xmm0
pmovmskb %xmm0, %eax
movdqa %xmm5, %xmm0
pcmpeqb %xmm1, %xmm0
pmovmskb %xmm0, %r9d
movdqa %xmm4, %xmm0
pcmpeqb %xmm1, %xmm0
pmovmskb %xmm0, %edx
movdqa %xmm3, %xmm0
pcmpeqb %xmm1, %xmm0
salq $16, %rdx
pmovmskb %xmm0, %r10d
movdqa %xmm2, %xmm0
pcmpeqb %xmm1, %xmm0
salq $32, %r10
orq %r10, %rdx
pmovmskb %xmm0, %r8d
orq %r9, %rdx
salq $48, %r8
orq %r8, %rdx
testl %eax, %eax
je L(loop64)
pcmpeqb %xmm6, %xmm4
pcmpeqb %xmm6, %xmm3
pcmpeqb %xmm6, %xmm5
pmovmskb %xmm4, %eax
pmovmskb %xmm3, %r10d
pcmpeqb %xmm6, %xmm2
pmovmskb %xmm5, %r9d
salq $32, %r10
salq $16, %rax
pmovmskb %xmm2, %r8d
orq %r10, %rax
orq %r9, %rax
salq $48, %r8
orq %r8, %rax
leaq -1(%rax), %r8
xorq %rax, %r8
andq %r8, %rdx
cmovne %rdi, %rcx
cmovne %rdx, %rsi
bsrq %rsi, %rsi
leaq (%rcx,%rsi), %rax
ret
.p2align 4
L(no_c_found):
movl $1, %esi
xorl %ecx, %ecx
jmp L(loop_header)
.p2align 4
L(exit):
xorl %eax, %eax
ret
.p2align 4
L(cross_page):
movq %rdi, %rax
pxor %xmm0, %xmm0
andq $-64, %rax
movdqu (%rax), %xmm5
movdqa %xmm5, %xmm6
movdqu 16(%rax), %xmm4
pcmpeqb %xmm1, %xmm5
pcmpeqb %xmm0, %xmm6
movdqu 32(%rax), %xmm3
pmovmskb %xmm6, %esi
movdqa %xmm4, %xmm6
movdqu 48(%rax), %xmm2
pcmpeqb %xmm1, %xmm4
pcmpeqb %xmm0, %xmm6
pmovmskb %xmm6, %edx
movdqa %xmm3, %xmm6
pcmpeqb %xmm1, %xmm3
pcmpeqb %xmm0, %xmm6
pcmpeqb %xmm2, %xmm0
salq $16, %rdx
pmovmskb %xmm3, %r9d
pmovmskb %xmm6, %r8d
pmovmskb %xmm0, %ecx
salq $32, %r9
salq $32, %r8
pcmpeqb %xmm1, %xmm2
orq %r8, %rdx
salq $48, %rcx
pmovmskb %xmm5, %r8d
orq %rsi, %rdx
pmovmskb %xmm4, %esi
orq %rcx, %rdx
pmovmskb %xmm2, %ecx
salq $16, %rsi
salq $48, %rcx
orq %r9, %rsi
orq %r8, %rsi
orq %rcx, %rsi
movl %edi, %ecx
subl %eax, %ecx
shrq %cl, %rdx
shrq %cl, %rsi
testq %rdx, %rdx
je L(loop_header2)
leaq -1(%rdx), %rax
xorq %rdx, %rax
andq %rax, %rsi
je L(exit)
bsrq %rsi, %rax
addq %rdi, %rax
ret
END (strrchr)
weak_alias (strrchr, rindex)
libc_hidden_builtin_def (strrchr)
|
