EMIT(MIR_Move.mutate(s, PPC_MOVE, def, left));
  protected final void INT_2ADDRZerExt(OPT_Instruction s,                                  OPT_RegisterOperand def,                                  OPT_RegisterOperand left) {    //-#if RVM_FOR_32_ADDR    EMIT(MIR_Move.mutate(s, PPC_MOVE, def, left));    //-#endif    //-#if RVM_FOR_64_ADDR    EMIT(MIR_Unary.create(PPC64_EXTZW, def, left));     //-#endif  }