[LLVMbugs] [Bug 21224] New: Missed optimization: replace the C2 constructor with the base class C2

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=21224

            Bug ID: 21224
           Summary: Missed optimization: replace the C2 constructor with
                    the base class C2
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: rafael.espindola at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Given

struct bar {
  bar();
  ~bar();
};
template<typename T>
struct foo : public bar {
};
foo<int> x;

the D2 destructor of foo is just replaced with the D2 destructor of bar, but
for the constructor we end up with

define linkonce_odr void @_ZN3fooIiEC2Ev(%struct.foo* %this) unnamed_addr #0
align 2 {
entry:
  %0 = bitcast %struct.foo* %this to %struct.bar*
  call void @_ZN3barC2Ev(%struct.bar* %0)
  ret void
}

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