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Problem #3 (15 points) The two ALU's are provided with each taking three cycles to finish the EX phase (internally pipelined). Indicate the comparators needed to detect the stall if one exists and the comparators needed for forwarding as well. EX3A IF ID MEM WB EXIA EX2A EXIB EX2B EX3B 1) LW R5, R4(20) SUB R5, R6, R4 ADDR3, R7, R7 SUB R7, R2, R9 2) LW R6, R5(30) ADD R7, R5, R6 SUB R9, R5, R6 MUL R9, R8, R7 3) SUB R9, R6, R4 LW R8, R9(40) ADD R5, R9, R8 SUB R4, RS, R8 Problem #3 (15 points) The two ALU's are provided with each taking three cycles to finish the EX phase (internally pipelined). Indicate the comparators needed to detect the stall if one exists and the comparators needed for forwarding as well. EX3A IF ID MEM WB EXIA EX2A EXIB EX2B EX3B 1) LW R5, R4(20) SUB R5, R6, R4 ADDR3, R7, R7 SUB R7, R2, R9 2) LW R6, R5(30) ADD R7, R5, R6 SUB R9, R5, R6 MUL R9, R8, R7 3) SUB R9, R6, R4 LW R8, R9(40) ADD R5, R9, R8 SUB R4, RS, R8