[M3devel] thoughts on NT386/LONGINT?

[Jay K]

Anyone have any thoughts on how to implement LONGINT on NT386?

 


The code is setup to do pretty good constant folding and enregistration.

 


I did the work so that constant folding should work for LONGINT.

 


However I think doing good enregistration is maybe still
too much work. In particular, I think every LONGINT
operation will do a load, operation, store.
Typical of unoptimized code, but not typical
of the Modula-3/NT386 quality.


 

In particular, there is still this notion of an "operand"
that might be held in one register.


 

I'd have to make it a register pair, or array of registers,
or invent "psuedo registers" that are register pairs.
An array of registers is the obvious best choice, but
none of these are a small change.

 


96 occurences of "reg" in Stackx86.m3, 58 in M3x86.m3,
would probably all have to change.
63 in Codex86.m3 unsure.
 It is the lowest level and might need to only deal with single
  registers.


 

Returning LONGINT from a function also needs separate attention.

Maybe I really should go ahead and use an array of registers?

 


 - Jay

 		 	   		  
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