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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [arch/] [sh/] [lib/] [memset.S] - Blame information for rev 1765

Line No.	Rev	Author	Line
1	1275	phoenix	`/* $Id: memset.S,v 1.1.1.1 2004-04-15 01:17:17 phoenix Exp $`
2			`*`
3			`* "memset" implementation of SuperH`
4			`*`
5			`* Copyright (C) 1999 Niibe Yutaka`
6			`*`
7			`*/`
8
9			`/*`
10			`* void memset(void s, int c, size_t n);`
11			`*/`
12
13			`#include`
14
15			`ENTRY(memset)`
16			`tst r6,r6`
17			`bt/s 5f ! if n=0, do nothing`
18			`add r6,r4`
19			`mov #12,r0`
20			`cmp/gt r6,r0`
21			`bt/s 4f ! if it's too small, set a byte at once`
22			`mov r4,r0`
23			`and #3,r0`
24			`cmp/eq #0,r0`
25			`bt/s 2f ! It's aligned`
26			`sub r0,r6`
27			`1:`
28			`dt r0`
29			`bf/s 1b`
30			`mov.b r5,@-r4`
31			`2: ! make VVVV`
32			`swap.b r5,r0 ! V0`
33			`or r0,r5 ! VV`
34			`swap.w r5,r0 ! VV00`
35			`or r0,r5 ! VVVV`
36			`!`
37			`mov r6,r0`
38			`shlr2 r0`
39			`shlr r0 ! r0 = r6 >> 3`
40			`3:`
41			`dt r0`
42			`mov.l r5,@-r4 ! set 8-byte at once`
43			`bf/s 3b`
44			`mov.l r5,@-r4`
45			`!`
46			`mov #7,r0`
47			`and r0,r6`
48			`tst r6,r6`
49			`bt 5f`
50			`! fill bytes`
51			`4:`
52			`dt r6`
53			`bf/s 4b`
54			`mov.b r5,@-r4`
55			`5:`
56			`rts`
57			`mov r4,r0`