The lower value of CPI means one instruction takes less time to execute. The cycles can be broken down into several parts in terms of how much time is spent in different pipeline stage.
CPI 值低就意味着指令花费的执行时间少。
2
Branch mis-prediction (Processor guesses the wrong branch, so it has to flush the pipeline and load instruction from proper branch again), or.
分支预测错误(处理器猜错了分支，所以它不得不更新流水线并从正确的分支装载指令)。
3
Setting up instructions so that they take full advantage of a processor's pipeline is called instruction scheduling.