公开(公告)号：JP2000003295A

公开(公告)日：2000-01-07

申请号：JP9643199

申请日：1999-04-02

Applicant: IBM

Inventor： FRANK ELLIOTT LEVIN ,  ROY STUART MOORE ,  CHARLES PHILIP ROSS ,  EDWARD HUGH WELBONE

IPC: G06F9/38 ,  G06F11/34

Abstract: PROBLEM TO BE SOLVED: To provide a method which can progress and monitor an instruction in a processor by preparing a circuit, etc., that can operate to transfer a 1st or 2nd reason code to a 3rd stage by means of a 1st or 2nd execution unit serving as a 2nd stage. SOLUTION: If a dispatch unit serving as a 1st stage stops its operation and cannot dispatch the instructions, a 1st execution unit serving as a 2nd stage receives no Job in a step 801. Then the processing proceeds to a step 803 to decide whether the 1st execution unit can produce its result. Therefore, the 1st execution unit carries out a division operation that requires plural cycles and can produce its result as soon as the division operation is over. Then in a step 804, the 1st execution unit transfers the result of the division operation (e.g. a 1st reason code) to an end unit serving as a 3rd stage.