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Re: Constraints between operands

From: "Frank Ch. Eigler" <fche at redhat dot com>
To: Will Newton <will dot newton at imgtec dot com>
Cc: cgen at sources dot redhat dot com
Date: Thu, 8 Sep 2005 16:28:09 -0400
Subject: Re: Constraints between operands
References: <0D107966AF6D79418315B7C5549F4B5104DFDC@lemail1.le.imgtec.org>

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

References:
- Constraints between operands
  - From: Will Newton

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