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Question 1: Problems in this exercise refer to the following sequence of instructions : LW $5,...

Question 1: Problems in this exercise refer to the following sequence of instructions

: LW $5, -16($5)

SW $5, -16($5)

ADD $5, $5, $5

A) Indicate dependences and their type. (40 Points)

B) Assume there is not forwarding in this pipeline processor, indicate hazards and add NOP instructions to eliminate them.

C) Assume there is full forwarding, indicate hazards and add NOP instructions to eliminate unresolved cases. The remaining problem in this exercise assumes the following clock cycle times: Without forwarding With full forwarding With ALU-ALU forwarding only 200 ps 250 ps 220 ps

D) What is the total execution time of this instruction sequence without forwarding and with full forwarding? What is the speed-up achieved by adding full forwarding to a pipeline that had no forwarding?

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

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Answer #1

Answer giventha Register De fendency Register 1 w$5,-155 Antiderencency Rt or L Rs OF Lu TIU frocess Sw $5,-16(5) oF Su RI RB) Sol In this hagard hay exis in the true depenclency Process Then are eliminaled Nop ha Bard the insurin then EXeruted insuD) The fowing elack cyele timey svch a without Foarding oops tuil torwar dinI with 950 Ps Foruar ding - ALU ALU Sol FU Forwar

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