System for controlling branch history table

A system for controlling a branch history table in a data processing apparatus which has a memory for storing a branch instruction address and a branch destination address, corresponding to the branch instruction in a one-to-one correspondence, as said branch history table and which employs a virtual storage scheme, comprising:

• a first register for storing the branch instruction address, said branch instruction address including a virtual space number which will be stored in said branch history table;
• a second register for storing the branch destination address corresponding to said branch instruction address stored in said first register, said branch destination address including a branch virtual space number, which will be stored in said branch history table;
• comparing means, connected to said first and second registers, for comparing the virtual space number stored in said first register and the branch virtual space number stored in said second register and outputting a compare signal to indicate a coincidence;
• and
• control means, receiving said compare signal, for enabling storage of said branch instruction address stored in said first register and said branch destination address stored in said second register in said branch history table in said memory when a coincidence is established as a result of comparison by said comparing means.