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ae6b8730 RH |
1 | /* Determine the length of a string. |
2 | For SPARC v7. | |
568035b7 | 3 | Copyright (C) 1996-2013 Free Software Foundation, Inc. |
41bdb6e2 | 4 | This file is part of the GNU C Library. |
462a5227 DM |
5 | Contributed by Jakub Jelinek <jj@ultra.linux.cz> and |
6 | David S. Miller <davem@davemloft.net>. | |
ae6b8730 RH |
7 | |
8 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
9 | modify it under the terms of the GNU Lesser General Public |
10 | License as published by the Free Software Foundation; either | |
11 | version 2.1 of the License, or (at your option) any later version. | |
ae6b8730 RH |
12 | |
13 | The GNU C Library is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 16 | Lesser General Public License for more details. |
ae6b8730 | 17 | |
41bdb6e2 | 18 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
19 | License along with the GNU C Library; if not, see |
20 | <http://www.gnu.org/licenses/>. */ | |
ae6b8730 RH |
21 | |
22 | #include <sysdep.h> | |
23 | ||
ae6b8730 RH |
24 | .text |
25 | .align 4 | |
043cee37 RM |
26 | |
27 | ENTRY(strlen) | |
462a5227 DM |
28 | mov %o0, %o1 |
29 | andn %o0, 0x3, %o0 | |
30 | ||
31 | ld [%o0], %o5 | |
32 | and %o1, 0x3, %g1 | |
33 | mov -1, %g5 | |
34 | ||
35 | sethi %hi(0x01010101), %o2 | |
36 | sll %g1, 3, %g1 | |
37 | ||
38 | or %o2, %lo(0x01010101), %o2 | |
39 | srl %g5, %g1, %g2 | |
40 | ||
41 | orn %o5, %g2, %o5 | |
42 | sll %o2, 7, %o3 | |
43 | 10: add %o0, 4, %o0 | |
44 | ||
45 | andn %o3, %o5, %g1 | |
46 | sub %o5, %o2, %g2 | |
47 | ||
48 | andcc %g1, %g2, %g0 | |
49 | be,a 10b | |
50 | ld [%o0], %o5 | |
51 | ||
52 | srl %o5, 24, %g1 | |
53 | ||
54 | andcc %g1, 0xff, %g0 | |
55 | be 90f | |
56 | sub %o0, 4, %o0 | |
57 | ||
58 | srl %o5, 16, %g2 | |
59 | ||
60 | andcc %g2, 0xff, %g0 | |
61 | be 90f | |
62 | add %o0, 1, %o0 | |
63 | ||
64 | srl %o5, 8, %g1 | |
65 | ||
66 | andcc %g1, 0xff, %g0 | |
67 | be 90f | |
68 | add %o0, 1, %o0 | |
69 | ||
70 | add %o0, 1, %o0 | |
71 | ||
72 | 90: retl | |
73 | sub %o0, %o1, %o0 | |
ae6b8730 | 74 | END(strlen) |
85dd1003 | 75 | libc_hidden_builtin_def (strlen) |