| 摘要 |
PROBLEM TO BE SOLVED: To surely prevent performance deterioration without requiring a large storage capacity for instruction control and by controlling so that the whole flow of instruction processing in a processor is not temporarily stopped in regard to an instruction control method. SOLUTION: The instruction control method having a delay instruction for branching is constituted so that at the time of branch prediction, after a branch instruction is estimated not to be branch established and an instruction is issued with the delay instruction once replaced with a Non-Operation instruction, when the previous branch instruction is determined to be branch established, an instruction is issued with not only an instruction fetch request of a branch destination but also a corresponding delay instruction extracted from storage; after the instruction is estimated to be branch established and a delay instruction corresponding to the branch instruction is issued, an instruction of the estimated branch destination is issued; and when the estimated branch destination is correct, the instruction is continued to be executed as it is, or when the estimated branch destination is incorrect, an instruction refetch request of the branch destination instruction after the delay instruction is made. COPYRIGHT: (C)2006,JPO&NCIPI
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