Commit | Line | Data |
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1da177e4 LT |
1 | /* strlen.S: Sparc64 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, 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz) | |
6 | */ | |
7 | ||
8 | #define LO_MAGIC 0x01010101 | |
9 | #define HI_MAGIC 0x80808080 | |
10 | ||
11 | .align 32 | |
12 | .globl strlen | |
13 | .type strlen,#function | |
14 | strlen: | |
15 | mov %o0, %o1 | |
16 | andcc %o0, 3, %g0 | |
17 | be,pt %icc, 9f | |
18 | sethi %hi(HI_MAGIC), %o4 | |
19 | ldub [%o0], %o5 | |
20 | brz,pn %o5, 11f | |
21 | add %o0, 1, %o0 | |
22 | andcc %o0, 3, %g0 | |
23 | be,pn %icc, 4f | |
24 | or %o4, %lo(HI_MAGIC), %o3 | |
25 | ldub [%o0], %o5 | |
26 | brz,pn %o5, 12f | |
27 | add %o0, 1, %o0 | |
28 | andcc %o0, 3, %g0 | |
29 | be,pt %icc, 5f | |
30 | sethi %hi(LO_MAGIC), %o4 | |
31 | ldub [%o0], %o5 | |
32 | brz,pn %o5, 13f | |
33 | add %o0, 1, %o0 | |
34 | ba,pt %icc, 8f | |
35 | or %o4, %lo(LO_MAGIC), %o2 | |
36 | 9: | |
37 | or %o4, %lo(HI_MAGIC), %o3 | |
38 | 4: | |
39 | sethi %hi(LO_MAGIC), %o4 | |
40 | 5: | |
41 | or %o4, %lo(LO_MAGIC), %o2 | |
42 | 8: | |
43 | ld [%o0], %o5 | |
44 | 2: | |
45 | sub %o5, %o2, %o4 | |
46 | andcc %o4, %o3, %g0 | |
47 | be,pt %icc, 8b | |
48 | add %o0, 4, %o0 | |
49 | ||
50 | /* Check every byte. */ | |
51 | srl %o5, 24, %g7 | |
52 | andcc %g7, 0xff, %g0 | |
53 | be,pn %icc, 1f | |
54 | add %o0, -4, %o4 | |
55 | srl %o5, 16, %g7 | |
56 | andcc %g7, 0xff, %g0 | |
57 | be,pn %icc, 1f | |
58 | add %o4, 1, %o4 | |
59 | srl %o5, 8, %g7 | |
60 | andcc %g7, 0xff, %g0 | |
61 | be,pn %icc, 1f | |
62 | add %o4, 1, %o4 | |
63 | andcc %o5, 0xff, %g0 | |
64 | bne,a,pt %icc, 2b | |
65 | ld [%o0], %o5 | |
66 | add %o4, 1, %o4 | |
67 | 1: | |
68 | retl | |
69 | sub %o4, %o1, %o0 | |
70 | 11: | |
71 | retl | |
72 | mov 0, %o0 | |
73 | 12: | |
74 | retl | |
75 | mov 1, %o0 | |
76 | 13: | |
77 | retl | |
78 | mov 2, %o0 | |
79 | ||
80 | .size strlen, .-strlen |