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Commit | Line | Data |
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1da177e4 LT |
1 | /* strlen.S: Sparc optimized strlen code |
2 | * Hand optimized from GNU libc's strlen | |
3 | * Copyright (C) 1991,1996 Free Software Foundation | |
4 | * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) | |
5 | * Copyright (C) 1996 Jakub Jelinek (jj@sunsite.mff.cuni.cz) | |
6 | */ | |
7 | ||
8 | #define LO_MAGIC 0x01010101 | |
9 | #define HI_MAGIC 0x80808080 | |
10 | ||
11 | 0: | |
12 | ldub [%o0], %o5 | |
13 | cmp %o5, 0 | |
14 | be 1f | |
15 | add %o0, 1, %o0 | |
16 | andcc %o0, 3, %g0 | |
17 | be 4f | |
18 | or %o4, %lo(HI_MAGIC), %o3 | |
19 | ldub [%o0], %o5 | |
20 | cmp %o5, 0 | |
21 | be 2f | |
22 | add %o0, 1, %o0 | |
23 | andcc %o0, 3, %g0 | |
24 | be 5f | |
25 | sethi %hi(LO_MAGIC), %o4 | |
26 | ldub [%o0], %o5 | |
27 | cmp %o5, 0 | |
28 | be 3f | |
29 | add %o0, 1, %o0 | |
30 | b 8f | |
31 | or %o4, %lo(LO_MAGIC), %o2 | |
32 | 1: | |
33 | retl | |
34 | mov 0, %o0 | |
35 | 2: | |
36 | retl | |
37 | mov 1, %o0 | |
38 | 3: | |
39 | retl | |
40 | mov 2, %o0 | |
41 | ||
42 | .align 4 | |
43 | .global strlen | |
44 | strlen: | |
45 | mov %o0, %o1 | |
46 | andcc %o0, 3, %g0 | |
47 | bne 0b | |
48 | sethi %hi(HI_MAGIC), %o4 | |
49 | or %o4, %lo(HI_MAGIC), %o3 | |
50 | 4: | |
51 | sethi %hi(LO_MAGIC), %o4 | |
52 | 5: | |
53 | or %o4, %lo(LO_MAGIC), %o2 | |
54 | 8: | |
55 | ld [%o0], %o5 | |
56 | 2: | |
57 | sub %o5, %o2, %o4 | |
58 | andcc %o4, %o3, %g0 | |
59 | be 8b | |
60 | add %o0, 4, %o0 | |
61 | ||
62 | /* Check every byte. */ | |
63 | srl %o5, 24, %g5 | |
64 | andcc %g5, 0xff, %g0 | |
65 | be 1f | |
66 | add %o0, -4, %o4 | |
67 | srl %o5, 16, %g5 | |
68 | andcc %g5, 0xff, %g0 | |
69 | be 1f | |
70 | add %o4, 1, %o4 | |
71 | srl %o5, 8, %g5 | |
72 | andcc %g5, 0xff, %g0 | |
73 | be 1f | |
74 | add %o4, 1, %o4 | |
75 | andcc %o5, 0xff, %g0 | |
76 | bne,a 2b | |
77 | ld [%o0], %o5 | |
78 | add %o4, 1, %o4 | |
79 | 1: | |
80 | retl | |
81 | sub %o4, %o1, %o0 |