Short forward conditional skip hardware
    5.
    发明授权
    Short forward conditional skip hardware 失效
    短暂的条件跳过硬件

    公开(公告)号:US3553655A

    公开(公告)日:1971-01-05

    申请号:US3553655D

    申请日:1969-03-28

    Applicant: IBM

    CPC classification number: G06F9/30069 G06F9/3846

    Abstract: A DATA PROCESSING SYSTEM HAS AN INSTRUCTION UNIT AND AN EXECUTION UNIT. IN PROCESSING A PROGRAM, WHEN A CONDITIONAL BRANCH INSTRUCTION IS ENCOUNTERED AND THE STATUS OF THE CONDITION IS NOT YET RESOLVED, THE SYSTEM OPERATES IN A CONDITIONAL MODE. IN SUCH MODE, A LIMITED NUMBER OF INSTRUCTIONS ARE ISSUED BY THE INSTRUCTION UNIT TO THE EXECUTION UNIT. SHOULD THE TARGET INSTRUCTION BE WITHIN THE LIMITED NUMBER, AND THUS BE CONSIDERED TO INVOLVE A SHORT FORWARD JUMP OR SKIP, IT IS ISSUED ON A NONCANCELLABLE BASIS WHILE INSTRUCTIONS BETWEEN THE BRANCH IN STRUCTION AND THE TARGET INSTRUCTION ARE ISSUED SUBJECT TO CANCELLATION OR EXECUTION IN THE EVENT THE BRANCH IS TAKEN OR IS NOT TAKEN, RESPECTIVELY.

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