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
|
/* string-fzi.h -- zero byte indexes. HPPA version.
Copyright (C) 2023-2025 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
<http://www.gnu.org/licenses/>. */
#ifndef _STRING_FZI_H
#define _STRING_FZI_H 1
#include <string-optype.h>
#include <string-fza.h>
_Static_assert (sizeof (op_t) == 4, "64-bit not supported");
static __always_inline unsigned int
index_first (find_t c)
{
unsigned int ret;
/* Since we have no clz insn, direct tests of the bytes is faster
than loading up the constants to do the masking. */
asm ("extrw,u,= %1,23,8,%%r0\n\t"
"ldi 2,%0\n\t"
"extrw,u,= %1,15,8,%%r0\n\t"
"ldi 1,%0\n\t"
"extrw,u,= %1,7,8,%%r0\n\t"
"ldi 0,%0"
: "=r"(ret) : "r"(c), "0"(3));
return ret;
}
static __always_inline unsigned int
index_last (find_t c)
{
unsigned int ret;
/* Since we have no ctz insn, direct tests of the bytes is faster
than loading up the constants to do the masking. */
asm ("extrw,u,= %1,15,8,%%r0\n\t"
"ldi 1,%0\n\t"
"extrw,u,= %1,23,8,%%r0\n\t"
"ldi 2,%0\n\t"
"extrw,u,= %1,31,8,%%r0\n\t"
"ldi 3,%0"
: "=r"(ret) : "r"(c), "0"(0));
return ret;
}
#endif /* _STRING_FZI_H */
|
