| 摘要 |
PROBLEM TO BE SOLVED: To effectively make use of various resources and to perform the out-of-order execution of more instructions by allowing a following instruction which does not depend upon the execution result of a synchronous instruction to perform out-of-order execution by itself as long as it is not a synchronous instruction. SOLUTION: A synchronous instruction detecting decoder 102 judges whether or not an instruction code that a processor 100 reads out of an external memory, etc., is a synchronous instruction which can not be executed before precedent instructions are all executed. Then an S bit of a reorder buffer 103 and an S bit of a reservation station 104 are set for a synchronous instruction and reset for a nonsynchronous instruction. The reservation station 104 feed instructions for which the S bit is not set, i.e., nonsynchronous instructions to a computing element 105 in order instructions which can be operated irrelevantly to the instruction order and executes them. For instructions after operation, an E bit of the reorder buffer 103 is set and the bit of the reservation station 104 is reset.
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