int x;

foo (void)
  if (x == 0)
    x = 0;

was optimized into empty routine with gcc 3.4 and 4.0, but isn't any longer in
4.1+.  In 4.0 apparently the store went away in *.optimized, and with
-fno-tree-ter in ce1+combine removed it.  This occurs quite a lot in

           Summary: [4.3/4.4/4.5/4.6 Regression] Useless store not optimized
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jakub at gcc dot gnu dot org

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