[Bug tree-optimization/22538] New: Eustore does not remove stores for struct assignments

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

Take the following code:
typedef struct dw_cfi_oprnd_struct {
  unsigned long reg;
} dw_cfa_location;
  dw_cfa_location loc;
void def_cfa_1 (void) {
  loc.reg = loc.reg;
}

We don't remove the store/load to loc.rec on the tree level.  We even don't remove PIC startup code for 
ppc-darwin either:
_def_cfa_1:
        mflr r0
        stw r31,-4(r1)
        lwz r31,-4(r1)
        mtlr r0
        blr

-- 
           Summary: Eustore does not remove stores for struct assignments
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Keywords: missed-optimization, TREE
          Severity: enhancement
          Priority: P2
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: pinskia at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22538