[LLVMdev] New backend help request.

[James Boulton]

Hmm, I'm getting nowhere pretty fast. It seems 68000 with its CISC nature is quite complex to implement for a novice.

I can see how to implement simple stuff, like --

move dn, dn
move dn, (an)

As that just turns into stores, sets, etc. But how would you represent things like indexed access?

move dn, (an,dn)
move dn, offset(an)

Can I only really define very simple operations for the main instruction info, and then the rest comes as optimisation? It sounds like that may not be very efficient?