EMIT(MIR_Return.mutate(s, PPC_BLR, rop.copyU2U(), null));
  protected final void RETURN(OPT_Instruction s, OPT_Operand value) {    if (value != null) {      OPT_RegisterOperand rop = (OPT_RegisterOperand)value;      if (value.getType().isLongType()) {        OPT_Register pair = regpool.getSecondReg(rop.register);        EMIT(MIR_Return.mutate(s, PPC_BLR, rop.copyU2U(), R(pair)));      } else {        EMIT(MIR_Return.mutate(s, PPC_BLR, rop.copyU2U(), null));      }    } else {      EMIT(MIR_Return.mutate(s, PPC_BLR, null, null));    }  }