source: buchla-68k/lib700/blkmove.s@ f40a309

Last change on this file since f40a309 was f40a309, checked in by Thomas Lopatic <thomas@…>, 7 years ago

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File size: 1010 bytes
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1* ------------------------------------------------------------------------------
2* blkmove.s -- block move function
3* Version 1 -- 1987-08-28 -- D.N. Lynx Crowe
4*
5* void
6* blkmove(to, from, n)
7* char *to, *from;
8* short n;
9*
10* Copies 'n' bytes from address 'from' to address 'to'.
11* Treats overlaps of from and to areas intelligently.
12* ------------------------------------------------------------------------------
13 .text
14*
15 .xdef _blkmove
16*
17_blkmove: link a6,#$FFFC
18 move.l 8(a6),d0
19 cmp.l 12(a6),d0
20 bcc blkm3
21*
22 bra blkm2
23*
24blkm1: movea.l 8(a6),a0
25 movea.l 12(a6),a1
26 move.b (a1),(a0)
27 addq.l #1,8(a6)
28 addq.l #1,12(a6)
29*
30blkm2: move.w 16(a6),d0
31 subq.w #1,16(a6)
32 tst.w d0
33 bne blkm1
34*
35 bra blkm6
36*
37blkm3: move.w 16(a6),d0
38 ext.l d0
39 add.l d0,8(a6)
40 add.l d0,12(a6)
41 bra blkm5
42*
43blkm4: subq.l #1,8(a6)
44 subq.l #1,12(a6)
45 movea.l 8(a6),a0
46 movea.l 12(a6),a1
47 move.b (a1),(a0)
48*
49blkm5: move.w 16(a6),d0
50 subq.w #1,16(a6)
51 tst.w d0
52 bne blkm4
53*
54blkm6: unlk a6
55 rts
56*
57 .end
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