Shri vishnu engineering college for women:: bhimavaram department of information technology



Download 3.29 Mb.
View original pdf
Page80/128
Date12.04.2022
Size3.29 Mb.
#58595
1   ...   76   77   78   79   80   81   82   83   ...   128
ITIIBTechIISemLecCOA
0910-ComputerSystemOverview02
MULTIPLE STREAMS

A simple pipeline suffers a penalty fora branch instruction because it must choose one of two instructions to fetch next and may make the wrong choice.
A brute-force approach is to replicate the initial portions of the pipeline and allow the pipeline to fetch both instructions, making use of two streams. There are two problems with this approach
• With multiple pipelines there are contention delays for access to the registers and to memory.
• Additional branch instructions may enter the pipeline (either stream) before the original branch decision is resolved. Each such instruction needs an additional stream. Examples of machines with two or more pipeline streams are the IBM 370/168 and the IBM 3033.

Download 3.29 Mb.

Share with your friends:
1   ...   76   77   78   79   80   81   82   83   ...   128




The database is protected by copyright ©ininet.org 2024
send message

    Main page