5.5 Instruction Pipeline

5.5.1 Basic concepts of instruction pipeline

Reference: Knowing the order of
指令流水定义:taking instructions, analyzing, and executing

1):T=3nt
2)One overlapping execution method:T=(1+2n)t
3)Second overlap execution method:T=(2+N)t

流水线的特点:

5.5.2 Classification of pipelines 了解

5.5.3 Factors affecting the pipeline

条件转移指令 TriggerControl related

5.5.4 Performance indicators of the pipeline

1.流水线的吞吐率: The number of tasks completed by the pipeline per unit time

TP=n/Tk #Tk是处理完n个任务所需时间

TP=n/(k+n-1)Δt
lim(n->∞)TP=1/Δt

2.流水线的加速比: To complete the same task, the ratio of the time used without the pipeline to the time used by the pipeline

S=T0/Tk #T0表示不用流水线的时间，Tk表示使用流水线时间

S=nkΔt/(k+n-1)Δt
lim(n->∞)S=k

3.流水线的效率: The ratio of the effective area of ​​the space-time area occupied by completing n tasks to the time used by the n tasks and the total area of ​​the space-time area enclosed by k flow sections.

E=mnΔt/m(m+n-1)Δt  #m条指令n段

5.5.5 Basic concepts of superscalar pipeline

1. Superscalar pipeline technology

2. Ultra-pipeline technology 一个时钟周期内一个功能部件使用多次

3. Ultra-long instruction words
with parallelism
例题