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
|
/* Copyright (C) 2002-2013 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Hartvig Ekner <hartvige@mips.com>, 2002.
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/>. */
#include <sysdep.h>
.set nomips16
/* void *memset(void *s, int c, size_t n). */
#if __MIPSEB
# define SWHI swl /* high part is left in big-endian */
#else
# define SWHI swr /* high part is right in little-endian */
#endif
ENTRY (memset)
.set noreorder
slti t1, a2, 8 # Less than 8?
bne t1, zero, L(last8)
move v0, a0 # Setup exit value before too late
beq a1, zero, L(ueven) # If zero pattern, no need to extend
andi a1, 0xff # Avoid problems with bogus arguments
sll t0, a1, 8
or a1, t0
sll t0, a1, 16
or a1, t0 # a1 is now pattern in full word
L(ueven):
subu t0, zero, a0 # Unaligned address?
andi t0, 0x3
beq t0, zero, L(chkw)
subu a2, t0
SWHI a1, 0(a0) # Yes, handle first unaligned part
addu a0, t0 # Now both a0 and a2 are updated
L(chkw):
andi t0, a2, 0x7 # Enough left for one loop iteration?
beq t0, a2, L(chkl)
subu a3, a2, t0
addu a3, a0 # a3 is last loop address +1
move a2, t0 # a2 is now # of bytes left after loop
L(loopw):
addiu a0, 8 # Handle 2 words pr. iteration
sw a1, -8(a0)
bne a0, a3, L(loopw)
sw a1, -4(a0)
L(chkl):
andi t0, a2, 0x4 # Check if there is at least a full
beq t0, zero, L(last8) # word remaining after the loop
subu a2, t0
sw a1, 0(a0) # Yes...
addiu a0, 4
L(last8):
blez a2, L(exit) # Handle last 8 bytes (if cnt>0)
addu a3, a2, a0 # a3 is last address +1
L(lst8l):
addiu a0, 1
bne a0, a3, L(lst8l)
sb a1, -1(a0)
L(exit):
j ra # Bye, bye
nop
.set reorder
END (memset)
libc_hidden_builtin_def (memset)
|
