4.9 In this exercise, we examine how data dependencies 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	290ps

4.9.1 Indicate dependencies and their type.

4.9.2 Assume there is no forwarding in this pipelined processor. Indicate hazards and add nop instructions to eliminate them.

4.9.3 Assume there is full forwarding. Indicate hazards and add NOP instructions to eliminate them.