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Re: Is store_expr(e,t,v!=m) safe?

From: Jan Hubicka <jh at suse dot cz>
To: Richard Henderson <rth at redhat dot com>,Steven Bosscher <s dot bosscher at student dot tudelft dot nl>,Roger Sayle <roger at www dot eyesopen dot com>, gcc at gcc dot gnu dot org
Date: Mon, 7 Apr 2003 23:56:52 +0200
Subject: Re: Is store_expr(e,t,v!=m) safe?
References: <Pine.LNX.4.44.0304060859330.2012-100000@www.eyesopen.com> <1049648010.20460.97.camel@steven> <20030407210014.GL9659@redhat.com>

> On Sun, Apr 06, 2003 at 06:53:29PM +0200, Steven Bosscher wrote:
> > Honza digged up a patch by Zdenek for this PR.  I have attached this
> > information to the PR audit trail.
> > http://gcc.gnu.org/ml/gcc-patches/2003-02/msg01655.html
> 
> But, as Zdenek mentions, this patch probably only masks the problem.
> I'll look into this today.

I think it does not mask it.  The problem is that a[0]=x is converted
into load+logicals+store of the whole "a" that fits in DImode that
doesn't hurt as long as we don't decide to spit "a" into constant memory
area.  Avoid purge_addressof from doing the (pessimizing) transfromation
and later changing the mind is the right way to go IMO.

Honza
> 
> 
> r~

Follow-Ups:
- Re: Is store_expr(e,t,v!=m) safe?
  - From: Richard Henderson

References:
- Is store_expr(e,t,v!=m) safe?
  - From: Roger Sayle
- Re: Is store_expr(e,t,v!=m) safe?
  - From: Steven Bosscher
- Re: Is store_expr(e,t,v!=m) safe?
  - From: Richard Henderson

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