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Re: AVR: CC0 to CCmode conversion

From: Denis Chertykov <denisc at overta dot ru>
To: Richard Henderson <rth at redhat dot com>
Cc: Denis Chertykov <denisc at overta dot ru>, Paul Schlie <schlie at comcast dot net>, gcc at gcc dot gnu dot org, Jan-Benedict Glaw <jbglaw at lug-owl dot de>
Date: 21 Mar 2005 20:52:59 +0300
Subject: Re: AVR: CC0 to CCmode conversion
References: <BE61C6CA.985C%schlie@comcast.net><ekea7fbz.fsf@localhost.localdomain><20050320160014.GB11791@redhat.com>

Richard Henderson <rth@redhat.com> writes:

> On Sun, Mar 20, 2005 at 01:59:44PM +0300, Denis Chertykov wrote:
> > The reload will generate addhi3 and reload will have a problem with
> > two modified regs (ZCMP_FLAGS, CARRY_FLAGS) which will be a bad
> > surprise for reload. :( As I remember.
> 
> In order to expose the flags register before reload, you *must*

Precisely to say while reload_in_progress.

> have load, store, reg-reg move, and add operations that do not
> modify the flags.

They (load, store, add) can modify flags before reload.
(while no reload_in_progress)
Is this OK ?

Denis.

Follow-Ups:
- Re: AVR: CC0 to CCmode conversion
  - From: Richard Henderson

References:
- Re: AVR: CC0 to CCmode conversion
  - From: Paul Schlie
- Re: AVR: CC0 to CCmode conversion
  - From: Denis Chertykov
- Re: AVR: CC0 to CCmode conversion
  - From: Richard Henderson

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