| 摘要 |
PURPOSE:To suppress useless prefetch of instruction, to reduce a load and to improve performance in an instruction control device by suppressing a reading request from a main storage device at the detection of a branch instruction and releasing said suppression at the completion of the execution of the branch instruction. CONSTITUTION:When prefetch of instruction inputted to an instruction buffer 2 is decoded by a decoder 8 and the existence of a branch instruction is detected, an FF 10 is turned on and OR between an output signal of the decoder 8 and an output signal of the FF 10 is found out by an OR circuit 12. The output signal of the OR circuit 12 is functioned as a suppressing signal to a NAND circuit 13 to suppress an instruction prefetch request signal 7. At the completion of the execution of the branch instruction, the suppressing status is released.
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