[Bug tree-optimization/45791] New: Missed devirtualization

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

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45791

           Summary: Missed devirtualization
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: hubicka@gcc.gnu.org


Compiling
// PR rtl-optimization/36185
// { dg-do run }
// { dg-options "-O2 -fgcse-sm" }

struct Base {
        virtual ~Base() {}
        virtual void f() = 0;
};
struct Derived : Base {
        Derived();
        virtual void f() {}
};
struct Foo {
        Foo(Base&);
};
Derived::Derived() {
        Foo foo(*this);
}
Foo::Foo(Base& base) {
        base.f();
}
int main() {
        Derived d;
}

makes einline to produce:
  MEM[(struct Base *)&d]._vptr.Base = &_ZTV4Base[2];
  d.D.2114._vptr.Base = &_ZTV7Derived[2];
  D.2243_5 = &d.D.2114;
  D.2241_6 = MEM[(struct Base *)&d]._vptr.Base;
  D.2242_7 = MEM[(int (*__vtbl_ptr_type) (void) *)D.2241_6 + 16B];
  OBJ_TYPE_REF(D.2242_7;D.2243_5->2) (D.2243_5);
this should get devirtualized but doesn't

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