Problem ??: (?? marks) Consider executing the following code on the MIPS pipelined datapath: add $t5, $t6, $t8 add $t9, $t5, $t4 lw $t3, 100($t9) sub $t2,

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Presentation transcript:

Problem ??: (?? marks) Consider executing the following code on the MIPS pipelined datapath: add $t5, $t6, $t8 add $t9, $t5, $t4 lw $t3, 100($t9) sub $t2, $t3, $t4 Using the following diagram for the MIPS pipeline, draw the pipeline execution diagram and show the forwarding paths needed to execute the above code while incorporating any stalls or forwarding to resolve the dependencies.

Problem ??: (?? marks) Given the following code sequence: LW $t2, 0($t1) Label1: BEQ $t2, $t0, Label2 # Not Taken once, then Taken LW $t3, 0($t2) BEQ $t3, $t0, Label1 # Taken ADD $t1, $t3, $t1 Label2: SW $t1, 0(St2) Assume that this sequence is executed on a pipelined processor with a 5-stage MIPS pipeline using forwarding and a predict-taken branch prediction method. Draw the pipeline execution diagram for this sequence, assuming that branch instructions are resolved in the EX stage. How many clock cycles are needed to execute this sequence? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 LW $t2, 0($t1) IF ID EX MEM WB BEQ $t2,$t0, Label2(NT) **** LW $t3, 0($t2) BEQ $t3, $t0, Label1(T) BEQ $t2, $t0, Label2(T) SW $t1, 0(St2)

Problem ??: (?? marks) Given the following code sequence: LW $t2, 0($t1) Label1: BEQ $t2, $t0, Label2 # Not Taken once, then Taken LW $t3, 0($t2) BEQ $t3, $t0, Label1 # Taken ADD $t1, $t3, $t1 Label2: SW $t1, 0(St2) Assume that this sequence is executed on a pipelined processor with a 5-stage MIPS pipeline using forwarding and a predict-taken branch prediction method. Draw the pipeline execution diagram for this sequence, assuming that branch instructions are resolved in the EX stage. How many clock cycles are needed to execute this sequence? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 LW $t2, 0($t1) IF ID EX MEM WB BEQ $t2,$t0, Label2(NT) LW $t3, 0($t2) BEQ $t3, $t0, Label1(T) BEQ $t2, $t0, Label2(T) SW $t1, 0(St2)

Problem ??: (?? marks) Given the following code sequence: LW $t2, 0($t1) Label1: BEQ $t2, $t0, Label2 # Not Taken once, then Taken LW $t3, 0($t2) BEQ $t3, $t0, Label1 # Taken ADD $t1, $t3, $t1 Label2: SW $t1, 0(St2) Assume that this sequence is executed on a pipelined processor with a 5-stage MIPS pipeline using forwarding and a predict-taken branch prediction method. Draw the pipeline execution diagram for this sequence, assuming that branch instructions are resolved in the EX stage. How many clock cycles are needed to execute this sequence? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 LW $t2, 0($t1) IF ID EX MEM WB BEQ $t2,$t0, Label2(NT) LW $t3, 0($t2) BEQ $t3, $t0, Label1(T) BEQ $t2, $t0, Label2(T) SW $t1, 0(St2)