blob: 8f56c378ff96e1a411bba11646b0c43238b79499 (
plain) (
blame)
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
|
/* Zero byte detection; indexes. RISCV version.
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
<http://www.gnu.org/licenses/>. */
#ifndef _STRING_RISCV_FZI_H
#define _STRING_RISCV_FZI_H 1
#ifdef __riscv_zbb
# include <sysdeps/generic/string-fzi.h>
#else
/* Without bitmap clz/ctz extensions, it is faster to direct test the bits
instead of calling compiler auxiliary functions. */
# include <string-optype.h>
static __always_inline unsigned int
index_first (find_t c)
{
if (c & 0x80U)
return 0;
if (c & 0x8000U)
return 1;
if (c & 0x800000U)
return 2;
if (sizeof (op_t) == 4)
return 3;
if (c & 0x80000000U)
return 3;
if (c & 0x8000000000UL)
return 4;
if (c & 0x800000000000UL)
return 5;
if (c & 0x80000000000000UL)
return 6;
return 7;
}
static __always_inline unsigned int
index_last (find_t c)
{
if (sizeof (op_t) == 8)
{
if (c & 0x8000000000000000UL)
return 7;
if (c & 0x80000000000000UL)
return 6;
if (c & 0x800000000000UL)
return 5;
if (c & 0x8000000000UL)
return 4;
}
if (c & 0x80000000U)
return 3;
if (c & 0x800000U)
return 2;
if (c & 0x8000U)
return 1;
return 0;
}
#endif
#endif /* STRING_FZI_H */
|
