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
|
/* Optimized strrchr implementation using LoongArch LSX instructions.
Copyright (C) 2023 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_lsx
LEAF(STRRCHR, 6)
move a2, a0
bstrins.d a0, zero, 4, 0
vld vr0, a0, 0
vld vr1, a0, 16
li.d t2, -1
vreplgr2vr.b vr4, a1
vmsknz.b vr2, vr0
vmsknz.b vr3, vr1
vilvl.h vr2, vr3, vr2
movfr2gr.s t0, fa2
sra.w t0, t0, a2
beq t0, t2, L(find_tail)
vseq.b vr2, vr0, vr4
vseq.b vr3, vr1, vr4
vmsknz.b vr2, vr2
vmsknz.b vr3, vr3
vilvl.h vr1, vr3, vr2
slli.d t3, t2, 1
movfr2gr.s t1, fa1
cto.w t0, t0
srl.w t1, t1, a2
sll.d t3, t3, t0
addi.d a0, a2, 31
andn t1, t1, t3
clz.w t0, t1
sub.d a0, a0, t0
maskeqz a0, a0, t1
jr ra
.align 5
L(find_tail):
addi.d a3, a0, 32
L(loop):
vld vr2, a0, 32
vld vr3, a0, 48
addi.d a0, a0, 32
vmin.bu vr5, vr2, vr3
vsetanyeqz.b fcc0, vr5
bceqz fcc0, L(loop)
vmsknz.b vr5, vr2
vmsknz.b vr6, vr3
vilvl.h vr5, vr6, vr5
vseq.b vr2, vr2, vr4
vseq.b vr3, vr3, vr4
vmsknz.b vr2, vr2
vmsknz.b vr3, vr3
vilvl.h vr2, vr3, vr2
movfr2gr.s t0, fa5
movfr2gr.s t1, fa2
slli.d t3, t2, 1
cto.w t0, t0
sll.d t3, t3, t0
andn t1, t1, t3
beqz t1, L(find_loop)
clz.w t0, t1
addi.d a0, a0, 31
sub.d a0, a0, t0
jr ra
L(find_loop):
beq a0, a3, L(find_end)
vld vr2, a0, -32
vld vr3, a0, -16
addi.d a0, a0, -32
vseq.b vr2, vr2, vr4
vseq.b vr3, vr3, vr4
vmax.bu vr5, vr2, vr3
vseteqz.v fcc0, vr5
bcnez fcc0, L(find_loop)
vmsknz.b vr0, vr2
vmsknz.b vr1, vr3
vilvl.h vr0, vr1, vr0
movfr2gr.s t0, fa0
addi.d a0, a0, 31
clz.w t0, t0
sub.d a0, a0, t0
jr ra
nop
L(find_end):
vseq.b vr2, vr0, vr4
vseq.b vr3, vr1, vr4
vmsknz.b vr2, vr2
vmsknz.b vr3, vr3
vilvl.h vr1, vr3, vr2
movfr2gr.s t1, fa1
addi.d a0, a2, 31
srl.w t1, t1, a2
clz.w t0, t1
sub.d a0, a0, t0
maskeqz a0, a0, t1
jr ra
END(STRRCHR)
libc_hidden_builtin_def(STRRCHR)
#endif
|
