MIPS write the program with Mars: Multitasking and Context Switching; Pipelining

Question

MIPS write the program with Mars:

Multitasking and Context Switching; Pipelining

Assume a 5-stage pipelined processor using the standard 5-stages (IF, ID, EX, MEM, WB) that uses no forwarding or stalling circuitry. Rather, you will use the compiler to add no-ops to the code to ensure correct execution.

Note: You can assume that if the processor reads and writes to the same register in a given cycle, the value read out will be the new value that is written in that cycle.

Write your own short program that re-writes the code below including the no-ops that are needed to protect against hazard conditions.

Include as few no-ops as possible. Do not change the order of the code statements.

Explanation / Answer

Answer is as follows :

After inserting no ops instreuctions to the given instruction , we get the following part.

add $3, $2, $3

NOP

lw $4, 100($3)

sub $7, $6, $2

NOP

xor $6, $4, $3

So the Pipelining with no forwarding technique is as follows :

if there is any query please ask in comments...

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 add $3, $2, $3 IF ID EX MEM WB lw $4, 100($3) IF * ID EX MEM WB sub $7, $6, $2 IF ID EX MEM WB xor $6, $4, $3 IF * ID EX MEM WB

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