From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-return-62149-listarch-gcc=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 9741 invoked by alias); 22 Oct 2002 19:22:40 -0000
Mailing-List: contact gcc-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Archive: <http://gcc.gnu.org/ml/gcc/>
List-Post: <mailto:gcc@gcc.gnu.org>
List-Help: <http://gcc.gnu.org/ml/>
Sender: gcc-owner@gcc.gnu.org
Received: (qmail 9733 invoked from network); 22 Oct 2002 19:22:39 -0000
Received: from unknown (HELO Cantor.suse.de) (213.95.15.193)
  by sources.redhat.com with SMTP; 22 Oct 2002 19:22:39 -0000
Received: from Hermes.suse.de (Charybdis.suse.de [213.95.15.201])
	by Cantor.suse.de (Postfix) with ESMTP
	id 414DB16FC7; Tue, 22 Oct 2002 21:22:38 +0200 (MEST)
Date: Tue, 22 Oct 2002 15:16:00 -0000
From: Michael Matz <matz@suse.de>
To: Andrew Haley <aph@redhat.com>
Cc: =?iso-8859-1?q?Gr=E9goire=20Dooms?= <dooms@student.info.ucl.ac.be>,
	<gcc@gcc.gnu.org>
Subject: Re: porting gcc
In-Reply-To: <15797.41590.824194.255887@cuddles.cambridge.redhat.com>
Message-ID: <Pine.LNX.4.33.0210222117360.20702-100000@wotan.suse.de>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
X-SW-Source: 2002-10/txt/msg01373.txt.bz2


On Tue, 22 Oct 2002, Andrew Haley wrote:

> =?iso-8859-1?Q?Gr=E9goire=5FDooms?= writes:
>  > I'd like to port gcc to the Microchip PIC 8 bit microcontroller familly.
>
> Ouch.  Are you really sure that you want to do this?  Gcc requires
> reasonably efficient addressing of stack frames in order to spill and
> fill when there are insufficient physical registers.  This might be
> hard to do on the PIC.  gcc has been [orted to some 16-bitters, but a
> microcontroller is a stretch.

The AVR _is_ a 8 bit microcontroller, and is supported by gcc (it also
supports it with 16bit integers).  Sure, it has around 30 free registers.
And yes, the stack pointer (like all its 16 bit pointers) actually are two
registers.


Ciao,
Michael.