[LLVMbugs] [Bug 20477] New: MS ABI: clang generates unnecessary vtordisp adjustment

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=20477

            Bug ID: 20477
           Summary: MS ABI: clang generates unnecessary vtordisp
                    adjustment
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: LLVM Codegen
          Assignee: unassignedclangbugs at nondot.org
          Reporter: david.majnemer at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

consider:
struct A {
  virtual A *f() { return this; }
};
struct B {
  B() {}
  virtual B *f() { return this; }
};
B b;

While both compilers agree on what B has in it's vftable in the first entry,
the second entry is different for both compilers.

For this entry, CL has ?f at B@@UAEPAU1 at XZ which performs only a return
adjustment.
However, clang-cl has does a 'vtordisp' adjustment *and* a return adjustment.

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