Re: how to implement general macro-insn expansion?

[Doug Evans <dje@transmeta.com>]

Greg McGary writes:
 > I stared at the code some more, and I think I understand it better
 > now.  rtl-c.scm is a toolkit for making builders.  Having a "builder
 > for each real insn" is what I want to do.

I _think_ that's the way to go.
As you get into it feel free to change your mind. :-)

 > Here's another comment from minsn.scm:
 > 
 > ; Expansion:
 > ; If the macro expands to a string, arguments in the input string
 > ; are refered to with %N.
 > 
 > By %N, do you mean that %0, %1, %2 stand for first, second and third
 > operands in the macro-insn's syntax string?

Yes.  That was some playing around I did _really_ early on.
Ignore it unless there's a seed of something useful there.

 > ; Multiple insns are separated with '\n'.
 > ; String expansion is a special case of the normal form which is a Scheme
 > ; expression that controls the expansion.
 > 
 > Do you still want to support this?  I'd rather just support the
 > general scheme expansion.

Dunno.  Feel free to ignore it for now.