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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [arch/] [m68k/] [lib/] [memcpy.c] - Blame information for rev 1765

Line No.	Rev	Author	Line
1	1275	phoenix	`#include <linux/types.h>`
2
3			`void * memcpy(void * to, const void * from, size_t n)`
4			`{`
5			`void *xto = to;`
6			`size_t temp, temp1;`
7
8			`if (!n)`
9			`return xto;`
10			`if ((long) to & 1)`
11			`{`
12			`char *cto = to;`
13			`const char *cfrom = from;`
14			`cto++ = cfrom++;`
15			`to = cto;`
16			`from = cfrom;`
17			`n--;`
18			`}`
19			`if (n > 2 && (long) to & 2)`
20			`{`
21			`short *sto = to;`
22			`const short *sfrom = from;`
23			`sto++ = sfrom++;`
24			`to = sto;`
25			`from = sfrom;`
26			`n -= 2;`
27			`}`
28			`temp = n >> 2;`
29			`if (temp)`
30			`{`
31			`long *lto = to;`
32			`const long *lfrom = from;`
33
34			`__asm__ __volatile__("movel %2,%3\n\t"`
35			`"andw #7,%3\n\t"`
36			`"lsrl #3,%2\n\t"`
37			`"negw %3\n\t"`
38			`"jmp %%pc@(1f,%3:w:2)\n\t"`
39			`"4:\t"`
40			`"movel %0@+,%1@+\n\t"`
41			`"movel %0@+,%1@+\n\t"`
42			`"movel %0@+,%1@+\n\t"`
43			`"movel %0@+,%1@+\n\t"`
44			`"movel %0@+,%1@+\n\t"`
45			`"movel %0@+,%1@+\n\t"`
46			`"movel %0@+,%1@+\n\t"`
47			`"movel %0@+,%1@+\n\t"`
48			`"1:\t"`
49			`"dbra %2,4b\n\t"`
50			`"clrw %2\n\t"`
51			`"subql #1,%2\n\t"`
52			`"jpl 4b\n\t"`
53			`: "=a" (lfrom), "=a" (lto), "=d" (temp),`
54			`"=&d" (temp1)`
55			`: "0" (lfrom), "1" (lto), "2" (temp)`
56			`);`
57			`to = lto;`
58			`from = lfrom;`
59			`}`
60			`if (n & 2)`
61			`{`
62			`short *sto = to;`
63			`const short *sfrom = from;`
64			`sto++ = sfrom++;`
65			`to = sto;`
66			`from = sfrom;`
67			`}`
68			`if (n & 1)`
69			`{`
70			`char *cto = to;`
71			`const char *cfrom = from;`
72			`cto = cfrom;`
73			`}`
74			`return xto;`
75			`}`