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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [arch/] [sparc64/] [lib/] [strlen.S] - Blame information for rev 1275

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Line No.	Rev	Author	Line
1	1275	phoenix	`/* 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			`.global strlen, __strlen`
13			`strlen:`
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, %g5`
52			`andcc %g5, 0xff, %g0`
53			`be,pn %icc, 1f`
54			`add %o0, -4, %o4`
55			`srl %o5, 16, %g5`
56			`andcc %g5, 0xff, %g0`
57			`be,pn %icc, 1f`
58			`add %o4, 1, %o4`
59			`srl %o5, 8, %g5`
60			`andcc %g5, 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`

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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [arch/] [sparc64/] [lib/] [strlen.S] - Blame information for rev 1275