[Bug tree-optimization/38401] TreeSSA-PRE load after store misoptimization

[rguenther at suse dot de]

------- Comment #13 from rguenther at suse dot de  2008-12-08 12:40 -------
Subject: Re:  TreeSSA-PRE load after store
 misoptimization

On Mon, 8 Dec 2008, sergeid at il dot ibm dot com wrote:

> ------- Comment #12 from sergeid at il dot ibm dot com  2008-12-08 11:53 -------
> I have to mention that tree PRE still don't catch this LOAD with -O3. 
> Though the patch Richard posted does the job.

Sorry if the comment wasn't clear - -O3 doesn't catch it, but this is
only because of the implementation decision fixed with that patch.

> (In reply to comment #1)
> > It works with -O3 (with partial-partial PRE enabled).  At least phi-translation
> > figures out that *res is zero on the incoming edge.
> > 
> > Un-leashing partial-PRE like with


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38401