72 lines
827 B
ArmAsm
72 lines
827 B
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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/* $Id: strlen.S,v 1.2 2001/06/29 14:07:15 gniibe Exp $
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*
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* "strlen" implementation of SuperH
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*
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* Copyright (C) 1999 Kaz Kojima
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*
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*/
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/* size_t strlen (const char *s) */
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#include <linux/linkage.h>
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ENTRY(strlen)
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mov r4,r0
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and #3,r0
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tst r0,r0
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bt/s 1f
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mov #0,r2
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add #-1,r0
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shll2 r0
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shll r0
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braf r0
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nop
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mov.b @r4+,r1
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tst r1,r1
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bt 8f
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add #1,r2
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mov.b @r4+,r1
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tst r1,r1
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bt 8f
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add #1,r2
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mov.b @r4+,r1
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tst r1,r1
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bt 8f
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add #1,r2
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1:
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mov #0,r3
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2:
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mov.l @r4+,r1
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cmp/str r3,r1
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bf/s 2b
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add #4,r2
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add #-4,r2
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#ifndef __LITTLE_ENDIAN__
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swap.b r1,r1
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swap.w r1,r1
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swap.b r1,r1
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#endif
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extu.b r1,r0
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tst r0,r0
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bt/s 8f
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shlr8 r1
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add #1,r2
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extu.b r1,r0
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tst r0,r0
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bt/s 8f
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shlr8 r1
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add #1,r2
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extu.b r1,r0
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tst r0,r0
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bt 8f
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add #1,r2
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8:
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rts
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mov r2,r0
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