https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: e8f897f4afef0031fe618a8e94127a0934896aba authored by Linus Torvalds on 10 March 2024, 20:38:09 UTC
Linux 6.8
Linux 6.8
Tip revision: e8f897f
memset.S
/* SPDX-License-Identifier: GPL-2.0 */
// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
#include <linux/linkage.h>
#include "sysdep.h"
.weak memset
ENTRY(__memset)
ENTRY(memset)
/* Test if len less than 4 bytes. */
mov r12, r0
cmplti r2, 8
bt .L_set_by_byte
andi r13, r0, 3
movi r19, 4
/* Test if dest is not 4 bytes aligned. */
bnez r13, .L_dest_not_aligned
/* Hardware can handle unaligned access directly. */
.L_dest_aligned:
zextb r3, r1
lsli r1, 8
or r1, r3
lsli r3, r1, 16
or r3, r1
/* If dest is aligned, then copy. */
zext r18, r2, 31, 4
/* Test if len less than 16 bytes. */
bez r18, .L_len_less_16bytes
LABLE_ALIGN
.L_len_larger_16bytes:
stw r3, (r0, 0)
stw r3, (r0, 4)
stw r3, (r0, 8)
stw r3, (r0, 12)
PRE_BNEZAD (r18)
addi r0, 16
BNEZAD (r18, .L_len_larger_16bytes)
.L_len_less_16bytes:
zext r18, r2, 3, 2
andi r2, 3
bez r18, .L_set_by_byte
.L_len_less_16bytes_loop:
stw r3, (r0, 0)
PRE_BNEZAD (r18)
addi r0, 4
BNEZAD (r18, .L_len_less_16bytes_loop)
/* Test if len less than 4 bytes. */
.L_set_by_byte:
zext r18, r2, 2, 0
bez r18, .L_return
.L_set_by_byte_loop:
stb r1, (r0, 0)
PRE_BNEZAD (r18)
addi r0, 1
BNEZAD (r18, .L_set_by_byte_loop)
.L_return:
mov r0, r12
rts
/* If dest is not aligned, just set some bytes makes the dest
align. */
.L_dest_not_aligned:
sub r13, r19, r13
sub r2, r13
.L_dest_not_aligned_loop:
/* Makes the dest align. */
stb r1, (r0, 0)
PRE_BNEZAD (r13)
addi r0, 1
BNEZAD (r13, .L_dest_not_aligned_loop)
cmplti r2, 8
bt .L_set_by_byte
/* Check whether the src is aligned. */
jbr .L_dest_aligned
ENDPROC(memset)
ENDPROC(__memset)