| 摘要 |
PROBLEM TO BE SOLVED: To enhance a processing efficiency in a pre-fetch operation. SOLUTION: The instruction pre-fetch control device includes a CPU 2 and an instruction cache part 10, wherein the instruction cache part has an instruction cache data memory 11, a pre-fetch buffer 14, an instruction cache write control part 15, and a hit or error determination access control part 12 which transfers an instruction string from the pre-fetch buffer 14 to the instruction cache data memory 11 and stores it in the instruction cache data memory 11 when the CPU 2 makes a fetch request for the instruction string stored in the pre-fetch buffer 14, and transfers the instruction string from the pre-fetch buffer 14 to the instruction cache data memory 11 according to a branch type, determines whether to store the instruction string and controls the instruction string when a branch occurs before the CPU 2 executes the instruction string stored in the pre-fetch buffer 14 or when the next instruction string of an instruction string of a branch destination is stored in the pre-fetch buffer 14. COPYRIGHT: (C)2008,JPO&INPIT
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