Superscalar processor controlling fetching of instructions based

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395375, 364DIG1, 364230, G06F 930

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active

054974968

ABSTRACT:
A plurality of instructions are read out from an instruction cache 1 for each cycle and temporarily stored in a second shift register SR2. The instructions stored in second shift register SR2 are transferred to empty positions of instruction registers IR0 to IR3 and fetched. An instruction decoder 3 selects instructions which can be processed in a parallel manner from the instructions stored in instruction registers IR0 to IR3 and supplies the same to any of processing units 4 to 7. A selector control circuit 12 controls the selection state of each selector 100 to 103, 200 to 203 based on a NUM signal indicating the number of empty instruction registers. The instructions stored in second shift register SR2 are thereby transferred to emptied instruction registers only. In this way, a new instruction is supplied to an empty instruction register as a supplement for each cycle.

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Grohoski, "Machine organization of the IBM RISC System/6000 Processor", IBM Journal of Research and Development, vol. 34, No. 1, Jan. 1990, pp. 37-58.

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