From mboxrd@z Thu Jan  1 00:00:00 1970
From: Richard Henderson <rth@cygnus.com>
To: law@cygnus.com
Cc: egcs@cygnus.com
Subject: Re: Feature request: ability to describe x86 register halves as contraints.
Date: Wed, 01 Jul 1998 03:42:00 -0000
Message-id: <19980701034306.B23054@dot.cygnus.com>
References: <199806301655.RAA04324@phal.cygnus.co.uk> <17543.899226092@hurl.cygnus.com>
X-SW-Source: 1998-07/msg00025.html

On Tue, Jun 30, 1998 at 11:01:32AM -0600, Jeffrey A Law wrote:
>   > I think we should change SUBREG to count addressable units instead of
>   > 'words'.  This would also fix some brokenness when there are
>   > varying register sizes (E.g. floating point wider than integer...)
> I'm not sure I'd recommend changing the meaning of SUBREG -- we might
> be better off with a new RTX for this kindof thing.

Actually, in the context of sparc64 lossage, Jim suggested
that the proper solution was to fix subreg part number be
unrelated anything target specific, so that a subreg would
mean exactly the same thing on all ports.

He of course added that it would be a stunning amount of work.


r~