mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-09 23:00:07 +00:00
69 lines
1.7 KiB
ArmAsm
69 lines
1.7 KiB
ArmAsm
/* Copyright (C) 1998-2024 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
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
/* Thumb requires excessive IT insns here. */
|
|
#define NO_THUMB
|
|
#include <sysdep.h>
|
|
|
|
.text
|
|
.syntax unified
|
|
|
|
/* void *memset (dstpp, c, len) */
|
|
|
|
ENTRY(memset)
|
|
mov r3, r0
|
|
cmp r2, #8
|
|
bcc 2f @ less than 8 bytes to move
|
|
|
|
1:
|
|
tst r3, #3 @ aligned yet?
|
|
strbne r1, [r3], #1
|
|
subne r2, r2, #1
|
|
bne 1b
|
|
|
|
and r1, r1, #255 @ clear any sign bits
|
|
orr r1, r1, r1, lsl $8
|
|
orr r1, r1, r1, lsl $16
|
|
mov ip, r1
|
|
|
|
1:
|
|
subs r2, r2, #8
|
|
stmiacs r3!, {r1, ip} @ store up to 32 bytes per loop iteration
|
|
subscs r2, r2, #8
|
|
stmiacs r3!, {r1, ip}
|
|
subscs r2, r2, #8
|
|
stmiacs r3!, {r1, ip}
|
|
subscs r2, r2, #8
|
|
stmiacs r3!, {r1, ip}
|
|
bcs 1b
|
|
|
|
and r2, r2, #7
|
|
2:
|
|
subs r2, r2, #1 @ store up to 4 bytes per loop iteration
|
|
strbcs r1, [r3], #1
|
|
subscs r2, r2, #1
|
|
strbcs r1, [r3], #1
|
|
subscs r2, r2, #1
|
|
strbcs r1, [r3], #1
|
|
subscs r2, r2, #1
|
|
strbcs r1, [r3], #1
|
|
bcs 2b
|
|
|
|
DO_RET(lr)
|
|
END(memset)
|
|
libc_hidden_builtin_def (memset)
|