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 [thread overview]
Message-ID: <17543.899226092@hurl.cygnus.com> (raw)
In-Reply-To: <199806301655.RAA04324@phal.cygnus.co.uk>
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
next prev parent reply other threads:[~1998-06-30 11:53 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
1998-06-29 20:41 ak
1998-06-30 0:42 ` Richard Henderson
1998-06-30 4:50 ` ak
1998-06-30 19:49 ` Alan Modra
1998-06-30 19:49 ` Andreas Kleen
1998-06-30 14:08 ` Jeffrey A Law
1998-06-30 9:24 ` Richard Henderson
1998-06-30 1:02 ` Jeffrey A Law
1998-06-30 11:53 ` Joern Rennecke
1998-06-30 11:53 ` Jeffrey A Law [this message]
1998-07-01 3:42 ` Richard Henderson
1998-06-30 15:15 ` Bill Currie
1998-06-30 15:26 ` Jeffrey A Law
1998-06-30 23:15 ` Bill Currie
1998-06-30 19:49 ` Jeffrey A Law
1998-07-01 10:51 ` Joern Rennecke
1998-07-01 10:51 ` Jeffrey A Law
1998-07-01 13:20 Michael Meissner
1998-07-01 20:15 ` Joern Rennecke
[not found] <359ABD84.2FC4@tssc.co.nz>
1998-07-02 1:39 ` Jeffrey A Law
1998-07-02 1:39 ` Bill Currie
1998-07-02 1:39 ` Jeffrey A Law
1998-07-03 0:12 ` Bill Currie
1998-07-02 11:02 ` Joern Rennecke
1998-07-02 15:15 ` Bill Currie
1998-07-02 15:15 ` Joern Rennecke
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