From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jeffrey A Law <law@cygnus.com>
To: Joern Rennecke <amylaar@cygnus.co.uk>
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: <17543.899226092@hurl.cygnus.com>
References: <199806301655.RAA04324@phal.cygnus.co.uk>
X-SW-Source: 1998-06/msg01130.html

  In message < 199806301655.RAA04324@phal.cygnus.co.uk >you write:
  > >   > 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...)
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.

jeff