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3. Consider executing the following code on the MIPS pipelined datapath with forwarding (text Figure 4.60, p. 316) add $2, $3, $1 sub $4, $3,

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3. Consider executing the following code on the MIPS pipelined datapath with forwarding (text Figure 4.60, p. 316) add $2, $3, $1 sub $4, $3, $5 add $5, $3, $7 add $7, $6, $1 add $8, $2, $6 During the fifth cycle of execution, which registers will be read, and which register will be written? a. b. During the fifth cycle of execution, what is the forwarding unit doing? List any comparisons it makes, even if results are not forwarded. During the fifth cycle of execution, what is the hazard detection unit doing? List any comparisons it makes, even if there is no hazard that requires a stall c. 3. Consider executing the following code on the MIPS pipelined datapath with forwarding (text Figure 4.60, p. 316) add $2, $3, $1 sub $4, $3, $5 add $5, $3, $7 add $7, $6, $1 add $8, $2, $6 During the fifth cycle of execution, which registers will be read, and which register will be written? a. b. During the fifth cycle of execution, what is the forwarding unit doing? List any comparisons it makes, even if results are not forwarded. During the fifth cycle of execution, what is the hazard detection unit doing? List any comparisons it makes, even if there is no hazard that requires a stall c

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