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Re: frame pointer must be single register?

From: Georg-Johann Lay <avr at gjlay dot de>
To: Jeff Law <law at redhat dot com>
Cc: DJ Delorie <dj at redhat dot com>, gcc at gcc dot gnu dot org
Date: Fri, 08 Jul 2011 20:02:09 +0200
Subject: Re: frame pointer must be single register?
References: <201107081707.p68H7aGe003027@greed.delorie.com> <4E173B06.9030508@redhat.com>

Jeff Law wrote:
> On 07/08/11 11:07, DJ Delorie wrote:
>> Is there an unwritten rule that the frame pointer must be a single
>> hard register?  I'm working on a port where $fp is a register pair,
>> and I've seen gcc allocate the second register to other things
>> (causing all sorts of problems).
> It's certainly caused problems (some of which I believe have been fixed
> within the last year or so)...  I think there's a port (AVR?) that may
> have similar characteristics.
> 
> jeff

Yes, and fixing the second part appears not to be the right approach.
I just committed a patch to fix PR46779, PR45291.

Johann

References:
- frame pointer must be single register?
  - From: DJ Delorie
- Re: frame pointer must be single register?
  - From: Jeff Law

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