cgen->sim question

[Dave Korn]

Dmitry Eremin-Solenikov wrote:
> Hello,
> 
> I have a question regarding generating sim code from cgen description.
> 
> I have an instruction operand instantiated from field with type h-addr.
> If in the semantics part of the instruction I try to access the operandr
> as an address: '(mem QI ddaddr)', I get an error from cgen:
> 
> simplify.inc:131:3: op:new-mode: invalid mode for operand `ddaddr': USI
> 
> This is the definition of ddaddr:
> 
> (dif f-dd-1 "1-byte direct address at 1 position" (ABS-ADDR) 8 8 0 8 UINT #f #f)
> (dno ddaddr "direct address" () h-addr f-dd-1)
> 

  I've seen this too.  I made it go away by changing the hardware element type
in the define-normal-operand from h-addr to h-uint (or h-sint in some cases).
 I don't know for a fact if it was the right thing to do, but all the
generated code ended up looking sane; it does leave me a little unsure,
however, because now I don't know what h-addr is actually supposed to be used
for - my port ends up not using it at all anywhere, and everything appears to
work.

    cheers,
      DaveK