Computer Organization

4.9 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,rl,r4 or rl.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 4.9.4 [10] What is the total execution time of this instruction sequence without forwarding and with full forwarding? What is the speedup achieved by adding full forwarding to a pipeline that had no forwarding? 4.9.5 [10] 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) 4.9.6 [10] What is the total execution time of this instruction sequence with only ALU-ALU forwarding? What is the speedup over a no-forwarding pipeline? 4.9 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,rl,r4 or rl.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 4.9.4 [10] What is the total execution time of this instruction sequence without forwarding and with full forwarding? What is the speedup achieved by adding full forwarding to a pipeline that had no forwarding? 4.9.5 [10] 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) 4.9.6 [10] What is the total execution time of this instruction sequence with only ALU-ALU forwarding? What is the speedup over a no-forwarding pipeline