how to make this code 68000 compliant?

jotd · 30 January 2021, 17:42

Code:

    tst.w    d1
    bne.b    .AAA
    swap    d2
    move.w    d2,d1
    clr.w    d2
    divu.l    d0,d1:d2   <====
    bvs.b    .AAA
    move.l    d2,d0

the "divu.l" instruction is not 68000 compatible (and AFAIR not 68060 compatible either)

can someone help to rewrite this code in a 68000 compatible way? I included the full code around for context.

Ernst Blofeld · 30 January 2021, 17:44

Quote:

Originally Posted by jotd

Code:

    tst.w    d1
    bne.b    .AAA
    swap    d2
    move.w    d2,d1
    clr.w    d2
    divu.l    d0,d1:d2   <====
    bvs.b    .AAA
    move.l    d2,d0

the "divu.l" instruction is not 68000 compatible (and AFAIR not 68060 compatible either)

can someone help to rewrite this code in a 68000 compatible way? I included the full code around for context.

Algorithm D?

http://eab.abime.net/showthread.php?...ght=AlgorithmD

I'm using that code with the 2 020 specific lines removed.

jotd · 30 January 2021, 18:25

ah I saw this thread a few weeks/days ago. thanks.

It may be worth testing against CPU before doing this. on a 68020 the divu.l is probably much faster.

30 January 2021, 17:42	#1
jotd This cat is no more Join Date: Dec 2004 Location: FRANCE Age: 52 Posts: 8,359	how to make this code 68000 compliant? Code: tst.w d1 bne.b .AAA swap d2 move.w d2,d1 clr.w d2 divu.l d0,d1:d2 <==== bvs.b .AAA move.l d2,d0 the "divu.l" instruction is not 68000 compatible (and AFAIR not 68060 compatible either) can someone help to rewrite this code in a 68000 compatible way? I included the full code around for context.

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30 January 2021, 18:25	#3
jotd This cat is no more Join Date: Dec 2004 Location: FRANCE Age: 52 Posts: 8,359	ah I saw this thread a few weeks/days ago. thanks. It may be worth testing against CPU before doing this. on a 68020 the divu.l is probably much faster.

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