void VMRegImpl::set_regName() {

      Register reg = ::as_Register(0);
      int i;
      for (i = 0; i < ConcreteRegisterImpl::max_gpr ; ) {
        regName[i++  ] = reg->name();
        regName[i++  ] = reg->name();
        reg = reg->successor();
      }

      FloatRegister freg = ::as_FloatRegister(0);
      for ( ; i < ConcreteRegisterImpl::max_fpr ; ) {
        regName[i++] = freg->name();
        if (freg->encoding() > 31) {
          regName[i++] = freg->name();
        }
        freg = freg->successor();
      }

      for ( ; i < ConcreteRegisterImpl::number_of_registers ; i ++ ) {
        regName[i] = "NON-GPR-FPR";
      }
    }