| 1 | /* SPDX-License-Identifier: GPL-2.0 */
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| 2 | /* $Id: strlen.S,v 1.2 2001/06/29 14:07:15 gniibe Exp $
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| 3 | *
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| 4 | * "strlen" implementation of SuperH
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| 5 | *
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| 6 | * Copyright (C) 1999 Kaz Kojima
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| 7 | *
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| 8 | */
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| 9 |
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| 10 | /* size_t strlen (const char *s) */
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| 11 |
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| 12 | |
| 13 | ENTRY(strlen)
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| 14 | mov r4,r0
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| 15 | and |
| 16 | tst r0,r0
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| 17 | bt/s 1f
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| 18 | mov |
| 19 |
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| 20 | add |
| 21 | shll2 r0
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| 22 | shll r0
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| 23 | braf r0
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| 24 | nop
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| 25 |
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| 26 | mov.b @r4+,r1
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| 27 | tst r1,r1
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| 28 | bt 8f
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| 29 | add |
| 30 |
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| 31 | mov.b @r4+,r1
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| 32 | tst r1,r1
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| 33 | bt 8f
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| 34 | add |
| 35 |
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| 36 | mov.b @r4+,r1
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| 37 | tst r1,r1
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| 38 | bt 8f
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| 39 | add |
| 40 |
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| 41 | 1:
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| 42 | mov |
| 43 | 2:
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| 44 | mov.l @r4+,r1
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| 45 | cmp/str r3,r1
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| 46 | bf/s 2b
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| 47 | add |
| 48 |
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| 49 | add |
| 50 | |
| 51 | swap.b r1,r1
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| 52 | swap.w r1,r1
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| 53 | swap.b r1,r1
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| 54 | |
| 55 | extu.b r1,r0
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| 56 | tst r0,r0
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| 57 | bt/s 8f
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| 58 | shlr8 r1
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| 59 | add |
| 60 | extu.b r1,r0
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| 61 | tst r0,r0
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| 62 | bt/s 8f
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| 63 | shlr8 r1
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| 64 | add |
| 65 | extu.b r1,r0
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| 66 | tst r0,r0
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| 67 | bt 8f
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| 68 | add |
| 69 | 8:
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| 70 | rts
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| 71 | mov r2,r0
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