[LLVMbugs] [Bug 6748] New: missed optimization for vtables

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=6748

           Summary: missed optimization for vtables
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: rafael.espindola at gmail.com
                CC: llvmbugs at cs.uiuc.edu, dgregor at apple.com


We produce a vtable for

template <typename T>
struct foo {
  virtual void bar() {}
};
template struct foo<int>;


so we don't have to produce one for

template <typename T>
struct foo {
  virtual void bar() {}
};
extern template struct foo<int>;
void zed() {
  foo<int> a;
  a.bar();
}

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