mirror of
https://github.com/RaySollium99/picodrive.git
synced 2025-10-27 21:48:50 +01:00
72 lines
1.8 KiB
ArmAsm
72 lines
1.8 KiB
ArmAsm
/* Copyright (C) 1998 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Philip Blundell <philb@gnu.org>
|
|
|
|
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, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
@ #include <sys/syscall.h>
|
|
|
|
.text
|
|
.global memset
|
|
.type memset,%function
|
|
.align 2
|
|
|
|
memset:
|
|
mov a4, a1
|
|
cmp a3, $8 @ at least 8 bytes to do?
|
|
blt 2f
|
|
orr a2, a2, a2, lsl $8
|
|
orr a2, a2, a2, lsl $16
|
|
1:
|
|
tst a4, $3 @ aligned yet?
|
|
strneb a2, [a4], $1
|
|
subne a3, a3, $1
|
|
bne 1b
|
|
mov ip, a2
|
|
1:
|
|
cmp a3, $8 @ 8 bytes still to do?
|
|
blt 2f
|
|
stmia a4!, {a2, ip}
|
|
sub a3, a3, $8
|
|
cmp a3, $8 @ 8 bytes still to do?
|
|
blt 2f
|
|
stmia a4!, {a2, ip}
|
|
sub a3, a3, $8
|
|
cmp a3, $8 @ 8 bytes still to do?
|
|
blt 2f
|
|
stmia a4!, {a2, ip}
|
|
sub a3, a3, $8
|
|
cmp a3, $8 @ 8 bytes still to do?
|
|
stmgeia a4!, {a2, ip}
|
|
subge a3, a3, $8
|
|
bge 1b
|
|
2:
|
|
movs a3, a3 @ anything left?
|
|
moveq pc, lr @ nope
|
|
rsb a3, a3, $7
|
|
add pc, pc, a3, lsl $2
|
|
mov r0, r0
|
|
strb a2, [a4], $1
|
|
strb a2, [a4], $1
|
|
strb a2, [a4], $1
|
|
strb a2, [a4], $1
|
|
strb a2, [a4], $1
|
|
strb a2, [a4], $1
|
|
strb a2, [a4], $1
|
|
mov pc, lr
|
|
|
|
.size memset,.-memset;
|
|
|