From: Bill Currie <bcurrie@tssc.co.nz>
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 15:15:00 -0000 [thread overview]
Message-ID: <359962C1.6A80@tssc.co.nz> (raw)
In-Reply-To: <15971.899192800@hurl.cygnus.com>
Jeffrey A Law wrote:
> 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.
Couldn't (subreg:QI (reg:HI 0) 1) or (subreg:QI (reg:SI 0) 1) be used to
represent AH? Trouble is, someone will have to teach egcs to use such
constructs (I'm not well versed on the operation of trees yet,
especially tree->rtl conversion)
Also, how difficult would it be to add eiter a new machine mode or a new
flag/interpretation of existing flags to represent halves of registers?
Bill
--
Leave others their otherness
next prev parent reply other threads:[~1998-06-30 15:15 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
1998-07-01 3:42 ` Richard Henderson
1998-06-30 15:15 ` Bill Currie [this message]
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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