INFORMATION PROCESSING SYSTEM COMPRISING A REGISTER RENEWAL WAITING CONTROL CIRCUIT WITH RENEWAL REGISTER NUMBER REGISTERING MEANS

When one of general registers has a register number indicated by a renewal instruction and should be renewed to a result of execution by an arithmetic unit of an execution time measured in terms of machine cycles for the renewal instruction, a register (91) holds the register number as a held number. From a machine cycle number representative of the execution time, a counter (95) is counted down in each machine cycle to successively provide decreasing numbers. Coincidence circuits (97, 98) find coincidence between the held number and two register numbers indicated by a current instruction which is preceded by the renewal instruction and for which two operands should be read from the general registers of the two register numbers. When the coincidence is found, execution of the current instruction is suspended. Otherwise, the operands are read. The suspension is released when the counter is counted down to zero.