Question

KINDLY DO IT IN PROPER WAY TOMMOROW IS MY FINAL

Q#1: Identify the Hazards in the code given below and remove them using

1. Only Forwarding                      (Show Forwarding using Graphical representation of pipeline)
2. Only Stalling                           (Show stalling using Graphical representation of pipe line )

                     

add $t0, $t1, $t2

add $t3, $t4, $t0

add $t5, $t6, $t0

Also write the forwarding equations which you used to remove hazards.

Answer 1

a) Only forwarding :-
No Hazards

Instruction	1	2	3	4	5	6	7
add $t0,$t1,$t2	IF	ID	EX	MEM	Wb
add $t3,$t4,$t0		IF	ID	EX	MEM	Wb
add $t5,$t6,$t0			IF	ID	EX	MEM	WB

b) Only stalling :-
Hazards raw :-
Instructions 0 and 1 . Register $t0
Instructions 0 and 2 . Register $t0

Instruction	1	2	3	4	5	6	7	8	9
add $t0,$t1,$t2	IF	ID	EX	MEM	Wb
add $t3,$t4,$t0		IF	ID	NOP	NOP	EX	MEM	WB
add $t5,$t6,$t0			IF	NOP	NOP	ID	EX	MEM	WB