He stage if any of its operands isn't ready. Consider executing the followi lw $r2, 10($1) sub $r4, $r3, Sr2 add $r5, $r6, $7 and $r8, Sr4,$r5 At the end of fifth cycle of execution, what instruction will be in each of

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
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5. Pipelined datapath has five stages, ie., instruction fetch (IF), decode (ID), execution (EX), memory
(MEM), and write back (WB). It has a hazard detection unit. An instruction will be stalled at the
decode stage if any of its operands isn't ready. Consider executing the following code on this datapath
(1) At the end of fifth cycle of execution, what instruction will be in each of the pipeline
stages? (If there is any "bubble" in the pipeline, please write "NOP" in the
corresponding pipeline stage.) (5%)
You must write the answer with the following format.
instruction
IF
instruction
lw $r2, 10($1)
sub $r4, $13, Sr2
add $r5, Sr6, $7
and Sr8, Sr4,$r5
IF
ID
EX
(2) If the datapath has a forwarding unit to resolve the data hazard, what instruction will be in
each of the pipeline stages at the end of the fifth cycle? (If there is any "bubble" in the
-pipeline, please write "NOP" in the corresponding pipeline stage.) (5%)
You must write the answer with the following format:
(D
MEM
EX
WB.
MEM
WR
Transcribed Image Text:5. Pipelined datapath has five stages, ie., instruction fetch (IF), decode (ID), execution (EX), memory (MEM), and write back (WB). It has a hazard detection unit. An instruction will be stalled at the decode stage if any of its operands isn't ready. Consider executing the following code on this datapath (1) At the end of fifth cycle of execution, what instruction will be in each of the pipeline stages? (If there is any "bubble" in the pipeline, please write "NOP" in the corresponding pipeline stage.) (5%) You must write the answer with the following format. instruction IF instruction lw $r2, 10($1) sub $r4, $13, Sr2 add $r5, Sr6, $7 and Sr8, Sr4,$r5 IF ID EX (2) If the datapath has a forwarding unit to resolve the data hazard, what instruction will be in each of the pipeline stages at the end of the fifth cycle? (If there is any "bubble" in the -pipeline, please write "NOP" in the corresponding pipeline stage.) (5%) You must write the answer with the following format: (D MEM EX WB. MEM WR
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