ARITHMETIC UNIT

摘要

PURPOSE: To improve the processing efficiency by providing a result code selection device which is connected to a magnitude comparison mechanism and a code circuit and selectively supplies the sign digit of an operand A or B as a result sign in response to first and third result condition signals. CONSTITUTION: Acoden selection circuit 60 receives a sign control (SIGN CON TROL) signal from a signal line 52 and selectively supplied sign values of operands A and B to signal lines 61 and 63 as the result sign as one of operand signs. This selected sign (SIGN) is supplied to a SIGN part 22 of a register 20 through a signal line 65. It is desirable that the code selection circuit 60 exists as a part of a code circuit 50. Thus, result condition determination in execution of packed decimal operation processing is promoted to improve the processing efficiency.