we would like to keep the pipeline full as much as possible and improve the performance. can we reorder the instructions to avoid NOPs? if so how? MLOA!PC14Address>AddInstructionmemory1w R15, 0(R2)add R14, R15, R151wR16, 4(R2)add R17, R16, R16IF/IDInstructionReadregister 1Readregister 2WriteregisterWritedataRegisters Readdata 2Readdata 116Sign-extend32ID/EXShiftleft 2Q: Where doesadd need R15?Add AddresultaddneedsR15ZeroALU ALUresultMA: No! Data is readyat the END of theMEM cycle, we needit at the start of EXEcycle for ADD!Q: Can weforward fromMEM?Iwhas R15AddressriteDatamemoryReaddata。Mux The code below was written without regard for the delay slots.(There may be NOPs missing. The pipeline has a double-pumped register file and forwarding.)lw R15, 0(R2)add1w R16, 4(R2)add R17, R16, R16R14, R15, R15

A pipeline refers to a method of improving the total efficiency and performance of processors by…

Answered: we would like to keep the pipeline full…

we would like to keep the pipeline full as much as possible and improve the performance. can we reorder the instructions to avoid NOPs? if so how?

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Concept explainers

Embedded Software Development

Using specific programming languages (like C and C++) to write code for a specific hardware device in which it runs is called embedded software development. It makes the device smart by performing actions based on user's input which improves the user experience. They are designed to perform function-specific tasks rather than doing multiple tasks like computers. The embedded system is incredibly intuitive. An embedded software system could be a system developed and organized on any device, apart from an old-fashioned computer. It is the brain of a specific device; however, it is a solely useless tool and simple to elucidate what software system is embedded.

Question

we would like to keep the pipeline full as much as possible and improve the performance. can we reorder the instructions to avoid NOPs? if so how?

M
LOA!
PC
1
4
Address
>Add
Instruction
memory
1w R15, 0(R2)
add R14, R15, R15
1w
R16, 4(R2)
add R17, R16, R16
IF/ID
Instruction
Read
register 1
Read
register 2
Write
register
Write
data
Registers Read
data 2
Read
data 1
16
Sign-
extend
32
ID/EX
Shift
left 2
Q: Where does
add need R15?
Add Add
result
add
needs
R15
Zero
ALU ALU
result
M
A: No! Data is ready
at the END of the
MEM cycle, we need
it at the start of EXE
cycle for ADD!
Q: Can we
forward from
MEM?
Iw
has R15
Address
rite
Data
memory
Read
data
。Mux

The code below was written without regard for the delay slots.
(There may be NOPs missing. The pipeline has a double-pumped register file and forwarding.)
lw R15, 0(R2)
add
1w R16, 4(R2)
add R17, R16, R16
R14, R15, R15

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