| 摘要 |
PROBLEM TO BE SOLVED: To fetch an instruction and data beyond many underived branches by encoding speculation at the time of compile related with a conditional branch which is present between a point of time when a prefetch request is started and a point of time when prefetched data are necessary, and specifying it to hardware at the time of execution. SOLUTION: A memory unit 102 stores instructions or data in an instruction cache 104 and a data cache 106, and divides each into blocks. Each block is fetched to a decode unit 110 by an instruction fetch unit 108. On the other hand, the fetch of the data block from a data cache 106 to a functioning units 116-1-116-K is processed by a data fetch unit 118. Then, speculation is encoded at the time of the compile of a conditional branch which is present between a point of time when a prefetch request for the speculation tag of an entry 200 is started, and a point of time when the prefetched data of a control unit 124 are necessary, and specified to a completing unit 122 at the time of execution. |
