return t;
return t.copyD2U();
  private OPT_Operand _prepareLongConstant(OPT_Operand op) {    /* for long and double constants, always move them to a register,     * therefor, BURS will split it in two registers.     */    OPT_RegisterOperand t = gc.temps.makeTemp(op.getType());    appendInstruction(Move.create(LONG_MOVE, t, op));    t.copyD2U();     return t;  }