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Commit | Line | Data |
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ae984d72 | 1 | /* strlen.S: Sparc optimized strlen code |
1da177e4 LT |
2 | * Hand optimized from GNU libc's strlen |
3 | * Copyright (C) 1991,1996 Free Software Foundation | |
ae984d72 | 4 | * Copyright (C) 1996,2008 David S. Miller (davem@davemloft.net) |
1da177e4 LT |
5 | * Copyright (C) 1996, 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz) |
6 | */ | |
7 | ||
ae984d72 DM |
8 | #include <linux/linkage.h> |
9 | #include <asm/asm.h> | |
d3867f04 | 10 | #include <asm/export.h> |
ae984d72 | 11 | |
1da177e4 LT |
12 | #define LO_MAGIC 0x01010101 |
13 | #define HI_MAGIC 0x80808080 | |
14 | ||
ae984d72 DM |
15 | .text |
16 | ENTRY(strlen) | |
1da177e4 LT |
17 | mov %o0, %o1 |
18 | andcc %o0, 3, %g0 | |
ae984d72 | 19 | BRANCH32(be, pt, 9f) |
1da177e4 LT |
20 | sethi %hi(HI_MAGIC), %o4 |
21 | ldub [%o0], %o5 | |
ae984d72 | 22 | BRANCH_REG_ZERO(pn, %o5, 11f) |
1da177e4 LT |
23 | add %o0, 1, %o0 |
24 | andcc %o0, 3, %g0 | |
ae984d72 | 25 | BRANCH32(be, pn, 4f) |
1da177e4 LT |
26 | or %o4, %lo(HI_MAGIC), %o3 |
27 | ldub [%o0], %o5 | |
ae984d72 | 28 | BRANCH_REG_ZERO(pn, %o5, 12f) |
1da177e4 LT |
29 | add %o0, 1, %o0 |
30 | andcc %o0, 3, %g0 | |
ae984d72 | 31 | BRANCH32(be, pt, 5f) |
1da177e4 LT |
32 | sethi %hi(LO_MAGIC), %o4 |
33 | ldub [%o0], %o5 | |
ae984d72 | 34 | BRANCH_REG_ZERO(pn, %o5, 13f) |
1da177e4 | 35 | add %o0, 1, %o0 |
ae984d72 | 36 | BRANCH32(ba, pt, 8f) |
1da177e4 LT |
37 | or %o4, %lo(LO_MAGIC), %o2 |
38 | 9: | |
39 | or %o4, %lo(HI_MAGIC), %o3 | |
40 | 4: | |
41 | sethi %hi(LO_MAGIC), %o4 | |
42 | 5: | |
43 | or %o4, %lo(LO_MAGIC), %o2 | |
44 | 8: | |
45 | ld [%o0], %o5 | |
46 | 2: | |
47 | sub %o5, %o2, %o4 | |
48 | andcc %o4, %o3, %g0 | |
ae984d72 | 49 | BRANCH32(be, pt, 8b) |
1da177e4 LT |
50 | add %o0, 4, %o0 |
51 | ||
52 | /* Check every byte. */ | |
53 | srl %o5, 24, %g7 | |
54 | andcc %g7, 0xff, %g0 | |
ae984d72 | 55 | BRANCH32(be, pn, 1f) |
1da177e4 LT |
56 | add %o0, -4, %o4 |
57 | srl %o5, 16, %g7 | |
58 | andcc %g7, 0xff, %g0 | |
ae984d72 | 59 | BRANCH32(be, pn, 1f) |
1da177e4 LT |
60 | add %o4, 1, %o4 |
61 | srl %o5, 8, %g7 | |
62 | andcc %g7, 0xff, %g0 | |
ae984d72 | 63 | BRANCH32(be, pn, 1f) |
1da177e4 LT |
64 | add %o4, 1, %o4 |
65 | andcc %o5, 0xff, %g0 | |
ae984d72 | 66 | BRANCH32_ANNUL(bne, pt, 2b) |
1da177e4 LT |
67 | ld [%o0], %o5 |
68 | add %o4, 1, %o4 | |
69 | 1: | |
70 | retl | |
71 | sub %o4, %o1, %o0 | |
72 | 11: | |
73 | retl | |
74 | mov 0, %o0 | |
75 | 12: | |
76 | retl | |
77 | mov 1, %o0 | |
78 | 13: | |
79 | retl | |
80 | mov 2, %o0 | |
ae984d72 | 81 | ENDPROC(strlen) |
d3867f04 | 82 | EXPORT_SYMBOL(strlen) |