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[mirror_ubuntu-artful-kernel.git] / arch / arc / lib / strlen.S
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1/*
2 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 */
8
ec7ac6af 9#include <linux/linkage.h>
5210d1e6 10
ec7ac6af 11ENTRY(strlen)
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12 or r3,r0,7
13 ld r2,[r3,-7]
14 ld.a r6,[r3,-3]
15 mov r4,0x01010101
16 ; uses long immediate
17#ifdef __LITTLE_ENDIAN__
18 asl_s r1,r0,3
19 btst_s r0,2
20 asl r7,r4,r1
21 ror r5,r4
22 sub r1,r2,r7
23 bic_s r1,r1,r2
24 mov.eq r7,r4
25 sub r12,r6,r7
26 bic r12,r12,r6
27 or.eq r12,r12,r1
28 and r12,r12,r5
29 brne r12,0,.Learly_end
30#else /* BIG ENDIAN */
31 ror r5,r4
32 btst_s r0,2
33 mov_s r1,31
34 sub3 r7,r1,r0
35 sub r1,r2,r4
36 bic_s r1,r1,r2
37 bmsk r1,r1,r7
38 sub r12,r6,r4
39 bic r12,r12,r6
40 bmsk.ne r12,r12,r7
41 or.eq r12,r12,r1
42 and r12,r12,r5
43 brne r12,0,.Learly_end
44#endif /* ENDIAN */
45
46.Loop:
47 ld_s r2,[r3,4]
48 ld.a r6,[r3,8]
49 ; stall for load result
50 sub r1,r2,r4
51 bic_s r1,r1,r2
52 sub r12,r6,r4
53 bic r12,r12,r6
54 or r12,r12,r1
55 and r12,r12,r5
56 breq r12,0,.Loop
57.Lend:
58 and.f r1,r1,r5
59 sub.ne r3,r3,4
60 mov.eq r1,r12
61#ifdef __LITTLE_ENDIAN__
62 sub_s r2,r1,1
63 bic_s r2,r2,r1
64 norm r1,r2
65 sub_s r0,r0,3
66 lsr_s r1,r1,3
67 sub r0,r3,r0
68 j_s.d [blink]
69 sub r0,r0,r1
70#else /* BIG ENDIAN */
71 lsr_s r1,r1,7
72 mov.eq r2,r6
73 bic_s r1,r1,r2
74 norm r1,r1
75 sub r0,r3,r0
76 lsr_s r1,r1,3
77 j_s.d [blink]
78 add r0,r0,r1
79#endif /* ENDIAN */
80.Learly_end:
81 b.d .Lend
82 sub_s.ne r1,r1,r1
ec7ac6af 83END(strlen)