Question: In this exercise, we examine how data dependences affect execution in the basic 5-stage pipeline described in Section 4.5. Problems in this exercise refer to

In this exercise, we examine how data dependences affect execution in the basic 5-stage pipeline described in Section 4.5. Problems in this exercise refer to the following sequence of instructions

:or r1,r2,r3

or r2,r1,r4

or r1,r1,r2

Also, assume the following cycle times for each of the options related to forwarding:

Without Forwarding With Full Forwarding With ALU-ALU Forwarding Only

250ps 300ps 280ps

e)Add nop instructions to this code to eliminate hazards if there is ALU-ALU forwarding only (no forwarding from the MEM to the EX stage).

f)What is the total execution time of this instruction sequence with only ALU-ALU forwarding? What is the speedup over a no-forwarding pipeline?

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