blob: f9b0a6d038fe34d60a9a872ca66bd7ade5c451d7 (
plain)
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
|
/* The standard memset function.
Copyright (C) 2011 Richard Henderson
This file is part of QEMU PALcode.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License or
(at your option) any later version.
This program 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 text
of the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; see the file COPYING. If not see
<http://www.gnu.org/licenses/>. */
#include "protos.h"
void *memset(void *optr, int ival, unsigned long size)
{
unsigned long val = ival;
void *ptr = optr;
if (__builtin_expect (size == 0, 0))
return optr;
if (__builtin_expect (val != 0, 0))
{
val = val & 0xff;
val |= val << 8;
val |= val << 16;
val |= val << 32;
}
if (__builtin_expect ((unsigned long)ptr & 1, 0))
{
*(char *)ptr = val;
ptr += 1;
size -= 1;
}
if (__builtin_expect ((unsigned long)ptr & 2, 0))
{
if (size < 2)
goto tail_1;
*(short *)ptr = val;
ptr += 2;
size -= 2;
}
if (__builtin_expect ((unsigned long)ptr & 4, 0))
{
if (size < 4)
goto tail_3;
*(int *)ptr = val;
ptr += 4;
size -= 4;
}
while (size >= 8)
{
*(long *)ptr = val;
ptr += 8;
size -= 8;
}
if (size >= 4)
{
*(int *)ptr = val;
ptr += 4;
size -= 4;
}
tail_3:
if (size >= 2)
{
*(short *)ptr = val;
ptr += 2;
size -= 2;
}
tail_1:
if (size > 0)
{
*(char *)ptr = val;
ptr += 1;
size -= 1;
}
return optr;
}
|
