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计算机组成教学课件:Chapter6 Pipelining
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2022-05-10
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计算机组成教学课件:Chapter6 Pipelining
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Chapter 6
Pipelining
Contents
6.1 Basic Concept of Pipelining
6.2 Pipeline Organization
6.3 Pipeline Issues
6.4 Data Dependencies
6.5 Memory Delays
6.6 Branch Delays
6.7 Resource Limitations
6.9 Superscalar Operation
2
6.1 Basic Concept of Pipelining
Circuit technology and hardware arrangement
influence the speed of execution for programs.
All computer units benefit from faster circuits.
Pipelining involves arranging the hardware to
perform multiple operations simultaneously.
Similar to assembly line where product moves
through stations that perform specific tasks.
Same total time for each item, but overlapped.
3
Pipelining in a Computer
Focus on pipelining of instruction execution.
Multistage datapath in Chapter 5 consists of:
Fetch, Decode, Compute, Memory, Write.
Instructions fetched & executed one at a time
with only one stage active in any cycle.
With pipelining, multiple stages are active
simultaneously for different instructions.
Still 5 cycles to execute one instruction, but rate
is 1 per cycle.
4
Fetch Decode Compute Memory Write
Fetch Decode Compute Memory Write
I
j+3
I
j+4
Fetch Decode Compute Memory Write
Fetch Decode Compute Memory Write
I
j+5
I
j+6
5
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