From mboxrd@z Thu Jan  1 00:00:00 1970
From: Greg McGary <greg@mcgary.org>
To: Doug Evans <dje@transmeta.com>
Cc: cgen@sourceware.cygnus.com
Subject: Re: how to implement general macro-insn expansion?
Date: Wed, 20 Dec 2000 00:48:00 -0000
Message-id: <msy9xb5vhp.fsf@mcgary.org>
References: <200012182002.NAA03245@kayak.mcgary.org> <14910.31997.701815.400981@casey.transmeta.com> <ms1yv37fcw.fsf_-_@mcgary.org>
X-SW-Source: 2000-q4/msg00282.html

Greg McGary <greg@mcgary.org> writes:

> ; Another thing to do is have a builder for each real insn so instead of
> ; expanding to text, the macro-expansion could invoke the builder for each
> ; expanded-to insn.
> 
> I don't understand this statement.  Could you elaborate?

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.

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?

; 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.

Greg