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Date: Thu, 08 Sep 2005 20:28:00 -0000
From: "Frank Ch. Eigler" <fche@redhat.com>
To: Will Newton <will.newton@imgtec.com>
Cc: cgen@sources.redhat.com
Subject: Re: Constraints between operands
Message-ID: <20050908202809.GA28732@redhat.com>
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Hi -

On Thu, Sep 08, 2005 at 02:55:16PM +0100, Will Newton wrote:
> [...]
> I'm using cgen to write a binutils port for a processor. I've come
> across a problem I haven't been able to solve yet with expressing a
> constraint between a number of fields in an instruction.
> [...]
> ADD D0.1,D0.2 ; Data unit 0 for both regs, OK
> ADD D0.1,D1.2 ; Data unit mismatch, error!
> [...]

One way may be to write a custom operand parser for the second D slot,
which would enforce this constraint.  It would signal a parse error.


- FChE