[PATCH][GCC][mid-end] Fix PR85123 incorrect copies

[Tamar Christina]

> -----Original Message-----
> From: Richard Biener <rguenther@suse.de>
> Sent: Friday, April 6, 2018 12:36
> To: Eric Botcazou <ebotcazou@adacore.com>
> Cc: gcc-patches@gcc.gnu.org; Alan Modra <amodra@gmail.com>; Tamar
> Christina <Tamar.Christina@arm.com>; nd <nd@arm.com>;
> law@redhat.com; ian@airs.com; bergner@vnet.ibm.com
> Subject: Re: [PATCH][GCC][mid-end] Fix PR85123 incorrect copies
> 
> On Fri, 6 Apr 2018, Eric Botcazou wrote:
> 
> > > I wonder if it's best to revert the original regression causing
> > > patch and look for a proper solution in the GCC 9 timeframe?
> >
> > Probably the best course of action indeed, as changes in this area
> > need to be thoroughly tested on various targets to cover all the cases.
> 
> So please go ahead with that now.  If we wind up with an obviously correct
> solution we can reconsider later, backporting to GCC 8.2+ is possible as well.

I was going to suggest a more conservative approach of only doing it if there is no
Padding correction. Since it seems to me the only targets that have an issue are those
which use padding corrections.

But I'll revert the patch then.

> 
> Thanks,
> Richard.