void VMRegImpl::set_regName() {

      Register reg = ::as_Register(0);
      int i;
      for (i = 0; i < ConcreteRegisterImpl::max_gpr ; ) {
        regName[i++] = reg->name();
    #ifdef AMD64
        regName[i++] = reg->name();
    #endif // AMD64
        reg = reg->successor();
      }

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

      XMMRegister xreg = ::as_XMMRegister(0);
      for ( ; i < ConcreteRegisterImpl::max_xmm ; ) {
        regName[i++] = xreg->name();
        regName[i++] = xreg->name();
        xreg = xreg->successor();
      }
      for ( ; i < ConcreteRegisterImpl::number_of_registers ; i ++ ) {
        regName[i] = "NON-GPR-FPR-XMM";
      }
    }