instruction fetch

• 1. 指令取出: instruction fetch
• 2. 机器指令取出周期: machine instruction fetch
• 3. 操作数取出指令: operand fetch instruction

• 1.分支提示至少是分支指令之前的4个指令取出组，否则就没有效果。
  At minimum, the branch hint must be four instruction fetch groups before the branch instruction, or it will have no effect.
  dict.yoduao.com
• 2.如果某个文件因为指令取出发生了缺页，那么会将非计算性文件转换为计算性状态。
  When a page fault is taken on a file due to an instruction fetch, only the non-computational file transitions to the computational state.
  dict.yoduao.com
• 3.要想让分支提示变得非常有效(这样分支就根本不会暂停了)，就必须设置至少4个指令取出组和分支指令之前的11个周期。
  For a branch hint to be most effective (so that the branch does not stall at all), it must be set at least four instruction fetch-groups plus 11 cycles before the branch instruction.
  dict.yoduao.com

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