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| /* SPDX-License-Identifier: GPL-2.0 */
| /* $Id: memset.S,v 1.1 2000/04/14 16:49:01 mjd Exp $
| *
| * "memset" implementation of SuperH
| *
| * Copyright (C) 1999 Niibe Yutaka
| *
| */
|
| /*
| * void *memset(void *s, int c, size_t n);
| */
|
| #include <linux/linkage.h>
|
| ENTRY(memset)
| tst r6,r6
| bt/s 5f ! if n=0, do nothing
| add r6,r4
| mov #12,r0
| cmp/gt r6,r0
| bt/s 4f ! if it's too small, set a byte at once
| mov r4,r0
| and #3,r0
| cmp/eq #0,r0
| bt/s 2f ! It's aligned
| sub r0,r6
| 1:
| dt r0
| bf/s 1b
| mov.b r5,@-r4
| 2: ! make VVVV
| extu.b r5,r5
| swap.b r5,r0 ! V0
| or r0,r5 ! VV
| swap.w r5,r0 ! VV00
| or r0,r5 ! VVVV
| !
| mov r6,r0
| shlr2 r0
| shlr r0 ! r0 = r6 >> 3
| 3:
| dt r0
| mov.l r5,@-r4 ! set 8-byte at once
| bf/s 3b
| mov.l r5,@-r4
| !
| mov #7,r0
| and r0,r6
| tst r6,r6
| bt 5f
| ! fill bytes
| 4:
| dt r6
| bf/s 4b
| mov.b r5,@-r4
| 5:
| rts
| mov r4,r0
|
|
