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A 5-stage pipelined processor has Instruction Fetch (IF), Instruction Decode (ID), Operand Fetch (OF), Perform Operation (PO) and Write Operand (WO) stages. The IF, ID, OF and WO stages take 1 clock cycle each for any instruction. The PO stage takes 1 clock cycle for ADD and SUB instructions, 3 clock cycles for MUL instruction, and 6 clock cycles for DIV instruction respectively. Operand forwarding is used in the pipeline. What is the number of clock cycles needed to execute the following sequence of instructions?
  • a)
    13
  • b)
    15
  • c)
    17
  • d)
    19
Correct answer is option 'B'. Can you explain this answer?
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A 5-stage pipelined processor has Instruction Fetch (IF), Instruction ...
It is given that there is operand forwarding. In the case of operand forwarding, the updated value from the previous instruction's PO stage is forwarded to the present instruction's PO stage. Here there's a RAW dependency between I1-I2 for R5 and between I2-I3 for R2. These dependencies are resolved by using operand forwarding as shown in the below table. The total number of clock cycles needed is 15.

clock cycles = 15.
Hence the correct answer is 15.
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Community Answer
A 5-stage pipelined processor has Instruction Fetch (IF), Instruction ...
It is given that there is operand forwarding. In the case of operand forwarding, the updated value from the previous instruction's PO stage is forwarded to the present instruction's PO stage. Here there's a RAW dependency between I1-I2 for R5 and between I2-I3 for R2. These dependencies are resolved by using operand forwarding as shown in the below table. The total number of clock cycles needed is 15.

clock cycles = 15.
Hence the correct answer is 15.
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A pipelined processor uses a 4-stage instruction pipeline with the following stages: instruction fetch (IF), Instruction decode (ID), Execute (EX) and Write-back (WB). The arithmetic operations as well as the load and store operations are carried out in the EX stage. The sequence of instructions corresponding to the statement X = (S - R * (P+ G))/T is given below. The values of variables P, Q, R, S and T are available in the registers R0, R1, R2, R3and R4respectively, before the execution of the instruction sequence.Q. The IF, ID and WB stages take 1 clock cycle each. The EX stage takes 1 clock cycle each for the ADD, SUB and STORE operations, and 3 clock cycles each for MUL and DIV operations. Operand forwarding from the EX stage to the ID stage is used. The number of clock cycles required to complete the sequence of instructions is

A pipelined processor uses a 4-stage instruction pipeline with the following stages: Instruction fetch (IF), Instruction decode (ID), Execute (EX) and Writeback (WB). The arithmetic operations as well as the load and store operations are carried out in the EX stage. The sequence of instructions corresponding to the statement X = (S - R * (P + Q))/T is given below. The values of variables P, Q, R, S and T are available in the registers R0, R1, R2, R3 and R4 respectively, before the execution of the instruction sequence.ADD R5, R0, R1 ; R5 R0 + R1MUL R6, R2, R5 ; R6 R2 * R5SUB R5, R3, R6 ; R5 R3 - R6DIV R6, R5, R4 ; R6 R5/R4STORE R6, X ; X R6The IF, ID and WB stages take 1 clock cycle each. The EX stage takes 1 clock cycle each for the ADD, SUB and STORE operations, and 3 clock cycles each for MUL and DIV operations. Operand forwarding from the EX stage to the ID stage is used. The number of clock cycles required to complete the sequence of instructions is

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A 5-stage pipelined processor has Instruction Fetch (IF), Instruction Decode (ID), Operand Fetch (OF), Perform Operation (PO) and Write Operand (WO) stages. The IF, ID, OF and WO stages take 1 clock cycle each for any instruction. The PO stage takes 1 clock cycle for ADD and SUB instructions, 3 clock cycles for MUL instruction, and 6 clock cycles for DIV instruction respectively. Operand forwarding is used in the pipeline. What is the number of clock cycles needed to execute the following sequence of instructions?a)13b)15c)17d)19Correct answer is option 'B'. Can you explain this answer?
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