mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2025-09-04 20:19:47 +08:00
c5af58b769
This patch adds string optimize codes and some auxiliary codes. Signed-off-by: Chen Linfei <linfei_chen@c-sky.com> Signed-off-by: Mao Han <han_mao@c-sky.com> Signed-off-by: Guo Ren <ren_guo@c-sky.com> Reviewed-by: Arnd Bergmann <arnd@arndb.de>
153 lines
2.9 KiB
ArmAsm
153 lines
2.9 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
|
|
// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
|
|
|
|
#include <linux/linkage.h>
|
|
#include "sysdep.h"
|
|
|
|
ENTRY(memcmp)
|
|
/* Test if len less than 4 bytes. */
|
|
mov r3, r0
|
|
movi r0, 0
|
|
mov r12, r4
|
|
cmplti r2, 4
|
|
bt .L_compare_by_byte
|
|
|
|
andi r13, r0, 3
|
|
movi r19, 4
|
|
|
|
/* Test if s1 is not 4 bytes aligned. */
|
|
bnez r13, .L_s1_not_aligned
|
|
|
|
LABLE_ALIGN
|
|
.L_s1_aligned:
|
|
/* If dest is aligned, then copy. */
|
|
zext r18, r2, 31, 4
|
|
/* Test if len less than 16 bytes. */
|
|
bez r18, .L_compare_by_word
|
|
|
|
.L_compare_by_4word:
|
|
/* If aligned, load word each time. */
|
|
ldw r20, (r3, 0)
|
|
ldw r21, (r1, 0)
|
|
/* If s1[i] != s2[i], goto .L_byte_check. */
|
|
cmpne r20, r21
|
|
bt .L_byte_check
|
|
|
|
ldw r20, (r3, 4)
|
|
ldw r21, (r1, 4)
|
|
cmpne r20, r21
|
|
bt .L_byte_check
|
|
|
|
ldw r20, (r3, 8)
|
|
ldw r21, (r1, 8)
|
|
cmpne r20, r21
|
|
bt .L_byte_check
|
|
|
|
ldw r20, (r3, 12)
|
|
ldw r21, (r1, 12)
|
|
cmpne r20, r21
|
|
bt .L_byte_check
|
|
|
|
PRE_BNEZAD (r18)
|
|
addi a3, 16
|
|
addi a1, 16
|
|
|
|
BNEZAD (r18, .L_compare_by_4word)
|
|
|
|
.L_compare_by_word:
|
|
zext r18, r2, 3, 2
|
|
bez r18, .L_compare_by_byte
|
|
.L_compare_by_word_loop:
|
|
ldw r20, (r3, 0)
|
|
ldw r21, (r1, 0)
|
|
addi r3, 4
|
|
PRE_BNEZAD (r18)
|
|
cmpne r20, r21
|
|
addi r1, 4
|
|
bt .L_byte_check
|
|
BNEZAD (r18, .L_compare_by_word_loop)
|
|
|
|
.L_compare_by_byte:
|
|
zext r18, r2, 1, 0
|
|
bez r18, .L_return
|
|
.L_compare_by_byte_loop:
|
|
ldb r0, (r3, 0)
|
|
ldb r4, (r1, 0)
|
|
addi r3, 1
|
|
subu r0, r4
|
|
PRE_BNEZAD (r18)
|
|
addi r1, 1
|
|
bnez r0, .L_return
|
|
BNEZAD (r18, .L_compare_by_byte_loop)
|
|
|
|
.L_return:
|
|
mov r4, r12
|
|
rts
|
|
|
|
# ifdef __CSKYBE__
|
|
/* d[i] != s[i] in word, so we check byte 0. */
|
|
.L_byte_check:
|
|
xtrb0 r0, r20
|
|
xtrb0 r2, r21
|
|
subu r0, r2
|
|
bnez r0, .L_return
|
|
|
|
/* check byte 1 */
|
|
xtrb1 r0, r20
|
|
xtrb1 r2, r21
|
|
subu r0, r2
|
|
bnez r0, .L_return
|
|
|
|
/* check byte 2 */
|
|
xtrb2 r0, r20
|
|
xtrb2 r2, r21
|
|
subu r0, r2
|
|
bnez r0, .L_return
|
|
|
|
/* check byte 3 */
|
|
xtrb3 r0, r20
|
|
xtrb3 r2, r21
|
|
subu r0, r2
|
|
# else
|
|
/* s1[i] != s2[i] in word, so we check byte 3. */
|
|
.L_byte_check:
|
|
xtrb3 r0, r20
|
|
xtrb3 r2, r21
|
|
subu r0, r2
|
|
bnez r0, .L_return
|
|
|
|
/* check byte 2 */
|
|
xtrb2 r0, r20
|
|
xtrb2 r2, r21
|
|
subu r0, r2
|
|
bnez r0, .L_return
|
|
|
|
/* check byte 1 */
|
|
xtrb1 r0, r20
|
|
xtrb1 r2, r21
|
|
subu r0, r2
|
|
bnez r0, .L_return
|
|
|
|
/* check byte 0 */
|
|
xtrb0 r0, r20
|
|
xtrb0 r2, r21
|
|
subu r0, r2
|
|
br .L_return
|
|
# endif /* !__CSKYBE__ */
|
|
|
|
/* Compare when s1 is not aligned. */
|
|
.L_s1_not_aligned:
|
|
sub r13, r19, r13
|
|
sub r2, r13
|
|
.L_s1_not_aligned_loop:
|
|
ldb r0, (r3, 0)
|
|
ldb r4, (r1, 0)
|
|
addi r3, 1
|
|
subu r0, r4
|
|
PRE_BNEZAD (r13)
|
|
addi r1, 1
|
|
bnez r0, .L_return
|
|
BNEZAD (r13, .L_s1_not_aligned_loop)
|
|
br .L_s1_aligned
|
|
ENDPROC(memcmp)
|