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1. 发明授权

US06622240B1 Method and apparatus for pre-branch instruction 有权
标题翻译：分支前指导的方法和装置
公开(公告)号：US06622240B1
公开(公告)日：2003-09-16
申请号：US09496008
申请日：2000-02-01
申请人： Timothy Alan Olson , James S. Blomgren
发明人： Timothy Alan Olson , James S. Blomgren
IPC分类号： G06F938
CPC分类号： G06F9/3867 , G06F9/30058 , G06F9/3804 , G06F9/3842 , G06F9/3846
摘要： A method and apparatus that minimizes instruction gaps behind a branch instruction in a multistage pipelined processor is disclosed. A pre-branch instruction that corresponds to a branch instruction to inserted into the instruction stream a sufficient number of instructions ahead of the branch instruction to insure that the pre-branch instruction exits the decode stage of the pipeline at the same time the branch instruction exits the first instruction fetch stage of the pipeline. The pre-branch instruction is decoded and causes the instruction fetch unit either to begin fetching instructions at a target address, where the branch is known or predicted to be taken, or to continue fetching instructions along the main execution path, the branch is known or predicted to be not taken.
摘要翻译：公开了一种使多级流水线处理器中的分支指令之后的指令间隙最小化的方法和装置。一个预分支指令，其对应于在分支指令之前插入到指令流中的足够数量的指令的分支指令，以确保分支指令在分支指令退出的同时离开流水线的解码级管道的第一个指令提取阶段。预分支指令被解码，并且使指令获取单元开始在目标地址处获取指令，其中分支已知或预测将被采用，或者继续沿着主执行路径获取指令，分支是已知的或预计不会被采取。

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