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pr45605.C devirtualize call failure in ia64-hp-hpux?


Hi,

This is related to pr45605.C test.

---- Reduced testcase

struct B {
  virtual void Run(){};
};

struct D : public B {
  virtual void Run() { };
};

int main() {
  D d;
  static_cast<B&>(d).Run();
}

With x86_64 linux the call to Run through object d is devirtualized.
Whereas it looks like in ia64 hp-ux it is not devirtualized.

-fdump-tree-fre1 output for both:

---- x86_64 linux:

  MEM[(struct B *)&d]._vptr.B = &MEM[(void *)&_ZTV1B + 16B];
  d.D.2197._vptr.B = &MEM[(void *)&_ZTV1D + 16B];
  D.2248_1 = &MEM[(void *)&_ZTV1D + 16B];
  D.2249_2 = Run;
  D::Run (&d.D.2197);
  d ={v} {CLOBBER};
  return 0;

---- ia64 hp-ux:

  MEM[(struct B *)&d]._vptr.B = &MEM[(void *)&_ZTV1B + 16B];
  d.D.1878._vptr.B = &MEM[(void *)&_ZTV1D + 16B];
  D.1929_1 = &MEM[(void *)&_ZTV1D + 16B];
  D.1930_2 = (int (*__vtbl_ptr_type) ()) &MEM[(void *)&_ZTV1D + 16B];
  OBJ_TYPE_REF(D.1930_2;&d.D.1878->0) (&d.D.1878);

Is it a bug (unexpected with O1 compilation) that it is not optimized to direct call?

Regards,
Kannan


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