ifield's value processing -- help is needed

[Frank Ch. Eigler]

Hi -

> (I'm not 100% sure if this is a correct place to ask, [...]

It is.

> I'm wandering if there is a possibility to specify (either in a `.cpu'
> file or in a corresponding `.opc' file) an additional processing
> function for a value of an instruction's ifield. For example, I'd like
> to define several isa sets. Suppose that these sets differ by opcode
> values only. In this case, I may supply a simple lookup function that
> picks the correct value depending on the isa. [...]

Have you considered using macros to expand to explicit isa-specific
instructions (basically generating the cartesian product of
instruction X isa in the cgen model), as opposed to trying to do this
selection based upon a run-time function call?

- FChE