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

[sergeid at il dot ibm dot com]

------- 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.

(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