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

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

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1* ------------------------------------------------------------------------------
2* lmul.s -- long multiply
3* Version 2 -- 1989-07-18
4* ------------------------------------------------------------------------------
5 .text
6*
7 .xdef lmul
8*
9ARG1 .equ 8
10ARG2 .equ 12
11*
12TEMP .equ -4
13*
14lmul: link a6,#-4
15 clr.w d2
16 tst.l ARG1(a6)
17 bge lmul1
18*
19 neg.l ARG1(a6)
20 addq.w #1,d2
21*
22lmul1: tst.l ARG2(a6)
23 bge lmul2
24*
25 neg.l ARG2(a6)
26 addq.w #1,d2
27*
28lmul2: move.w ARG1+2(a6),d0
29 mulu ARG2+2(a6),d0
30 move.l d0,TEMP(a6)
31 move.w ARG1(a6),d0
32 mulu ARG2+2(a6),d0
33 move.w ARG2(a6),d1
34 mulu ARG1+2(a6),d1
35 add.w d1,d0
36 add.w TEMP(a6),d0
37 move.w d0,TEMP(A6)
38 move.l TEMP(a6),d0
39 btst #0,d2
40 beq lmul3
41*
42 neg.l d0
43*
44lmul3: unlk a6
45 rts
46*
47 .end
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