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
|
/* Optimized strrchr implementation using LoongArch LASX instructions.
Copyright (C) 2023-2024 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>
#include <sys/regdef.h>
#include <sys/asm.h>
#if IS_IN (libc) && !defined __loongarch_soft_float
#define STRRCHR __strrchr_lasx
LEAF(STRRCHR, 6)
move a2, a0
bstrins.d a0, zero, 5, 0
xvld xr0, a0, 0
xvld xr1, a0, 32
li.d t2, -1
xvreplgr2vr.b xr4, a1
xvmsknz.b xr2, xr0
xvmsknz.b xr3, xr1
xvpickve.w xr5, xr2, 4
xvpickve.w xr6, xr3, 4
vilvl.h vr2, vr5, vr2
vilvl.h vr3, vr6, vr3
vilvl.w vr2, vr3, vr2
movfr2gr.d t0, fa2
sra.d t0, t0, a2
beq t0, t2, L(find_tail)
xvseq.b xr2, xr0, xr4
xvseq.b xr3, xr1, xr4
xvmsknz.b xr2, xr2
xvmsknz.b xr3, xr3
xvpickve.w xr4, xr2, 4
xvpickve.w xr5, xr3, 4
vilvl.h vr2, vr4, vr2
vilvl.h vr3, vr5, vr3
vilvl.w vr1, vr3, vr2
slli.d t3, t2, 1
movfr2gr.d t1, fa1
cto.d t0, t0
srl.d t1, t1, a2
sll.d t3, t3, t0
addi.d a0, a2, 63
andn t1, t1, t3
clz.d t0, t1
sub.d a0, a0, t0
maskeqz a0, a0, t1
jr ra
.align 5
L(find_tail):
addi.d a3, a0, 64
L(loop):
xvld xr2, a0, 64
xvld xr3, a0, 96
addi.d a0, a0, 64
xvmin.bu xr5, xr2, xr3
xvsetanyeqz.b fcc0, xr5
bceqz fcc0, L(loop)
xvmsknz.b xr5, xr2
xvmsknz.b xr6, xr3
xvpickve.w xr7, xr5, 4
xvpickve.w xr8, xr6, 4
vilvl.h vr5, vr7, vr5
vilvl.h vr6, vr8, vr6
xvseq.b xr2, xr2, xr4
xvseq.b xr3, xr3, xr4
xvmsknz.b xr2, xr2
xvmsknz.b xr3, xr3
xvpickve.w xr7, xr2, 4
xvpickve.w xr8, xr3, 4
vilvl.h vr2, vr7, vr2
vilvl.h vr3, vr8, vr3
vilvl.w vr5, vr6, vr5
vilvl.w vr2, vr3, vr2
movfr2gr.d t0, fa5
movfr2gr.d t1, fa2
slli.d t3, t2, 1
cto.d t0, t0
sll.d t3, t3, t0
andn t1, t1, t3
beqz t1, L(find_loop)
clz.d t0, t1
addi.d a0, a0, 63
sub.d a0, a0, t0
jr ra
L(find_loop):
beq a0, a3, L(find_end)
xvld xr2, a0, -64
xvld xr3, a0, -32
addi.d a0, a0, -64
xvseq.b xr2, xr2, xr4
xvseq.b xr3, xr3, xr4
xvmax.bu xr5, xr2, xr3
xvseteqz.v fcc0, xr5
bcnez fcc0, L(find_loop)
xvmsknz.b xr0, xr2
xvmsknz.b xr1, xr3
xvpickve.w xr2, xr0, 4
xvpickve.w xr3, xr1, 4
vilvl.h vr0, vr2, vr0
vilvl.h vr1, vr3, vr1
vilvl.w vr0, vr1, vr0
movfr2gr.d t0, fa0
addi.d a0, a0, 63
clz.d t0, t0
sub.d a0, a0, t0
jr ra
nop
L(find_end):
xvseq.b xr2, xr0, xr4
xvseq.b xr3, xr1, xr4
xvmsknz.b xr2, xr2
xvmsknz.b xr3, xr3
xvpickve.w xr4, xr2, 4
xvpickve.w xr5, xr3, 4
vilvl.h vr2, vr4, vr2
vilvl.h vr3, vr5, vr3
vilvl.w vr1, vr3, vr2
movfr2gr.d t1, fa1
addi.d a0, a2, 63
srl.d t1, t1, a2
clz.d t0, t1
sub.d a0, a0, t0
maskeqz a0, a0, t1
jr ra
END(STRRCHR)
libc_hidden_builtin_def(STRRCHR)
#endif
|
