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: how to implement general macro-insn expansion?
Date: Tue, 19 Dec 2000 22:54:00 -0000
Message-id: <ms1yv37fcw.fsf_-_@mcgary.org>
References: <200012182002.NAA03245@kayak.mcgary.org> <14910.31997.701815.400981@casey.transmeta.com>
X-SW-Source: 2000-q4/msg00281.html

Doug,

I found this comment in opc-itab.scm before the definition of
`-gen-macro-insn-table':

; The general form is a Scheme expression that is interpreted at runtime to
; decide how to perform the expansion.  Yes, that means having a (perhaps
; minimal) Scheme interpreter in the assembler.

I hope the idea of having a scheme interpreter in the assembler is
outdated.  My plan was to reuse as much of rtl-c.scm as possible to
generate something analogous to sem-switch.c for the gas-runtime
stuff.

; 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?

Thanks,
Greg