From mboxrd@z Thu Jan  1 00:00:00 1970
From: Joern Rennecke <amylaar@cygnus.co.uk>
To: law@cygnus.com
Cc: ak@muc.de, egcs@cygnus.com
Subject: Re: Feature request: ability to describe x86 register halves as contraints.
Date: Tue, 30 Jun 1998 11:53:00 -0000
Message-id: <199806301655.RAA04324@phal.cygnus.co.uk>
References: <15971.899192800@hurl.cygnus.com>
X-SW-Source: 1998-06/msg01129.html

>   > Is it possible to add such an extension to the constraints language? 
>   > Hopefully only minimal changes should be needed for this. 
> First there'd have to be a way to describe hi/lo halves of registers
> in RTL.  I'm not aware of any such mechanism.

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...)