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
|
/* Optimized strlen 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 STRLEN __strlen_lasx
LEAF(STRLEN, 6)
move a1, a0
bstrins.d a0, zero, 4, 0
li.d t1, -1
xvld xr0, a0, 0
xvmsknz.b xr0, xr0
xvpickve.w xr1, xr0, 4
vilvl.h vr0, vr1, vr0
movfr2gr.s t0, fa0 # sign extend
sra.w t0, t0, a1
beq t0, t1, L(loop)
cto.w a0, t0
jr ra
L(loop):
xvld xr0, a0, 32
addi.d a0, a0, 32
xvsetanyeqz.b fcc0, xr0
bceqz fcc0, L(loop)
xvmsknz.b xr0, xr0
sub.d a0, a0, a1
xvpickve.w xr1, xr0, 4
vilvl.h vr0, vr1, vr0
movfr2gr.s t0, fa0
cto.w t0, t0
add.d a0, a0, t0
jr ra
END(STRLEN)
libc_hidden_builtin_def (STRLEN)
#endif
|
