[PATCH] Fix part of PR45678

[Richard Guenther]

On Fri, 17 Sep 2010, H.J. Lu wrote:

> On Fri, Sep 17, 2010 at 1:48 AM, Richard Guenther <rguenther@suse.de> wrote:
> >
> > This fixes part of PR45678 where memcpy folding lies about alignment
> > of memory accesses. Â Usually this shouldn't matter for !STRICT_ALIGNMENT
> > targets but some targets are half strict-alignment but lie about that
> > (x86_64 for example, where all vector modes require strict alignment).
> > For those targets we require that they implement a movmisalign
> > optab for the affected modes.
> >
> > Bootstrapped and tested on x86_64-unknown-linux-gnu, committed.
> >
> > Richard.
> >
> > 2010-09-17  Richard Guenther  <rguenther@suse.de>
> >
> > Â  Â  Â  Â PR middle-end/45678
> > Â  Â  Â  Â * builtins.c (fold_builtin_memory_op): Always properly adjust
> > Â  Â  Â  Â alignment of memory accesses.
> >
> 
> Could you please add the testcase in PR 45678?

It isn't fixed - cfgexpand still messes up DECL_ALIGN as I said in
the PR.

Richard.