[Bug tree-optimization/49516] New: SRA generates memory references into its replacements

["jamborm at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49516

           Summary: SRA generates memory references into its replacements
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: jamborm@gcc.gnu.org


When SRA tries to modify an assignment where on one side it should put
one new scalar replacement but the other is actually an aggregate with
a number of replacements for it, it will generate a MEM-REF into the
former replacement which can lead to miscompilations.

Originally reported here by Xinliang David Li:
http://gcc.gnu.org/ml/gcc-patches/2011-06/msg01380.html

I have only slightly changed the original testcase so that it does not
require any includes and will attach it shortly.