Information processing device

An information processing device comprising:

• an instruction fetch portion which fetches both a sequential side instruction sequence and a target side instruction sequence of a branching instruction;
• a cache controller which fetches instructions from a cache memory or from a main memory in response to a fetch request from said instruction fetch portion;
• a memory bus access portion which accesses said main memory;
• an instruction buffer which buffers instructions which have been fetched;
• and
• a branching prediction portion which, prior to an execution of a branching instruction, performs a branching prediction for the branching instruction which is stored in said instruction buffer;
• wherein, while a branching direction of said branching instruction is not yet determined, if the cache controller has performed a cache miss, said cache controller performs or does not perform a memory bus access to said main memory depending on a branching direction predicted by the branching prediction portion.

An information processing device comprising:

• an instruction fetch portion adapted to fetch a sequential side instruction sequence and a target side instruction sequence of a branching instruction;
• a cache controller adapted to fetch instructions from one of a cache memory and a main memory in response to a fetch request from the instruction fetch portion;
• a memory bus access portion adapted to access the main memory;
• an instruction buffer adapted to buffer instructions which have been fetched;
• and
• a branching prediction portion adapted to perform, prior to an execution of a branching instruction, a branching prediction for the branching instruction which is stored in the instruction buffer;
• wherein, while the branching direction of the branching instruction is not yet determined, if the cache controller performs a cache miss, the cache controller performs a memory bus access to the main memory according to an instruction of a branching direction predicted by the branching prediction portion.