RECORDING DEVICE FOR INSTRUCTION RUN ADDRESS

PURPOSE:To separate a program into a part which is already run and a part which is not run by recording automatically a run identification flag corresponding to an instruction address of a program to be recorded without deteriorating processing function. CONSTITUTION:Write data to an instruction run address recording device 100 is determined according to whether an instruction being executed by an information processor 1 is a branch instruction or not and by a branch success signal sent out through a bus 106. This data is sent out to an instruction run address storage part 8. Further, every time one instruction is executed by the processor 1, a low-order instruction address is selected by a record identification register 6 and comparing circuits 5a-5h, and an identification flag is stored in a two-bit storage area in the storage part 8 which is selected by said address. The contents of the storage part 8 are read out to a main storage device 2 by a bus 109 through the processor 1 on the basis of the flag, and the program is separated into a part which is already run and the part which is not run almost without deterioration in performance.