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| /* SPDX-License-Identifier: GPL-2.0 */
| // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
|
| #include <linux/linkage.h>
| #include "sysdep.h"
|
| ENTRY(strcmp)
| mov a3, a0
| /* Check if the s1 addr is aligned. */
| xor a2, a3, a1
| andi a2, 0x3
| bnez a2, 7f
| andi t1, a0, 0x3
| bnez t1, 5f
|
| 1:
| /* If aligned, load word each time. */
| ldw t0, (a3, 0)
| ldw t1, (a1, 0)
| /* If s1[i] != s2[i], goto 2f. */
| cmpne t0, t1
| bt 2f
| /* If s1[i] == s2[i], check if s1 or s2 is at the end. */
| tstnbz t0
| /* If at the end, goto 3f (finish comparing). */
| bf 3f
|
| ldw t0, (a3, 4)
| ldw t1, (a1, 4)
| cmpne t0, t1
| bt 2f
| tstnbz t0
| bf 3f
|
| ldw t0, (a3, 8)
| ldw t1, (a1, 8)
| cmpne t0, t1
| bt 2f
| tstnbz t0
| bf 3f
|
| ldw t0, (a3, 12)
| ldw t1, (a1, 12)
| cmpne t0, t1
| bt 2f
| tstnbz t0
| bf 3f
|
| ldw t0, (a3, 16)
| ldw t1, (a1, 16)
| cmpne t0, t1
| bt 2f
| tstnbz t0
| bf 3f
|
| ldw t0, (a3, 20)
| ldw t1, (a1, 20)
| cmpne t0, t1
| bt 2f
| tstnbz t0
| bf 3f
|
| ldw t0, (a3, 24)
| ldw t1, (a1, 24)
| cmpne t0, t1
| bt 2f
| tstnbz t0
| bf 3f
|
| ldw t0, (a3, 28)
| ldw t1, (a1, 28)
| cmpne t0, t1
| bt 2f
| tstnbz t0
| bf 3f
|
| addi a3, 32
| addi a1, 32
|
| br 1b
|
| # ifdef __CSKYBE__
| /* d[i] != s[i] in word, so we check byte 0. */
| 2:
| xtrb0 a0, t0
| xtrb0 a2, t1
| subu a0, a2
| bez a2, 4f
| bnez a0, 4f
|
| /* check byte 1 */
| xtrb1 a0, t0
| xtrb1 a2, t1
| subu a0, a2
| bez a2, 4f
| bnez a0, 4f
|
| /* check byte 2 */
| xtrb2 a0, t0
| xtrb2 a2, t1
| subu a0, a2
| bez a2, 4f
| bnez a0, 4f
|
| /* check byte 3 */
| xtrb3 a0, t0
| xtrb3 a2, t1
| subu a0, a2
| # else
| /* s1[i] != s2[i] in word, so we check byte 3. */
| 2:
| xtrb3 a0, t0
| xtrb3 a2, t1
| subu a0, a2
| bez a2, 4f
| bnez a0, 4f
|
| /* check byte 2 */
| xtrb2 a0, t0
| xtrb2 a2, t1
| subu a0, a2
| bez a2, 4f
| bnez a0, 4f
|
| /* check byte 1 */
| xtrb1 a0, t0
| xtrb1 a2, t1
| subu a0, a2
| bez a2, 4f
| bnez a0, 4f
|
| /* check byte 0 */
| xtrb0 a0, t0
| xtrb0 a2, t1
| subu a0, a2
|
| # endif /* !__CSKYBE__ */
| jmp lr
| 3:
| movi a0, 0
| 4:
| jmp lr
|
| /* Compare when s1 or s2 is not aligned. */
| 5:
| subi t1, 4
| 6:
| ldb a0, (a3, 0)
| ldb a2, (a1, 0)
| subu a0, a2
| bez a2, 4b
| bnez a0, 4b
| addi t1, 1
| addi a1, 1
| addi a3, 1
| bnez t1, 6b
| br 1b
|
| 7:
| ldb a0, (a3, 0)
| addi a3, 1
| ldb a2, (a1, 0)
| addi a1, 1
| subu a0, a2
| bnez a0, 4b
| bnez a2, 7b
| jmp r15
| ENDPROC(strcmp)
|
|
