Consider a pipelined processor with the following four stages: IF: Instruction Fetch ID: Instruction Decode and Operand Fetch EX: Execute WB: Write BackThe IF, ID and WB stages take one clock cycle each to complete the operation. The number of clock cycles for the EX stage depends on the instruction. The ADD and SUB instructions need 1 clock cycle and the MUL instruction needs 3 clock cycles in the EX stage. Operand forwarding is used in the pipelined processor. What is the number of clock cycles taken to complete the following sequence of instructions?ADD R2, R1, R0 R2 R1 + R0MUL R4, R3, R2 R4 R3 * R2SUB R6, R5, R4 R6 R5 - R4a)7b)8c)10d)14Correct answer is option 'B'. Can you explain this answer? - EduRev Computer Science Engineering (CSE) Question

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Consider a pipelined processor with the following four stages:

IF: Instruction Fetch
ID: Instruction Decode and Operand Fetch
EX: Execute
WB: Write Back

The IF, ID and WB stages take one clock cycle each to complete the operation. The number of clock cycles for the EX stage depends on the instruction. The ADD and SUB instructions need 1 clock cycle and the MUL instruction needs 3 clock cycles in the EX stage. Operand forwarding is used in the pipelined processor. What is the number of clock cycles taken to complete the following sequence of instructions?
ADD R2, R1, R0 R2 ← R1 + R0
MUL R4, R3, R2 R4 ← R3 * R2
SUB R6, R5, R4 R6 ← R5 - R4

a)
7
b)
8
c)
10
d)
14

Correct answer is option 'B'. Can you explain this answer?

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Consider a pipelined processor with the following four stages: IF: Ins...

Answer: option B
considering EX to EX data forwarding.

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Consider a pipelined processor with the following four stages: IF: Ins...

The given sequence of instructions consists of three instructions: ADD, MUL, and SUB. To determine the number of clock cycles taken to complete these instructions, we need to consider the pipeline stages for each instruction and the dependencies between them.

1. ADD R2, R1, R0:
- IF stage: Fetches the ADD instruction.
- ID stage: Decodes the instruction and fetches the operands R1 and R0.
- EX stage: Executes the ADD operation, which takes 1 clock cycle.
- WB stage: Writes the result to register R2.

2. MUL R4, R3, R2:
- IF stage: Fetches the MUL instruction.
- ID stage: Decodes the instruction and fetches the operands R3 and R2.
- EX stage: Executes the MUL operation, which takes 3 clock cycles.
- WB stage: Writes the result to register R4.

3. SUB R6, R5, R4:
- IF stage: Fetches the SUB instruction.
- ID stage: Decodes the instruction and fetches the operands R5 and R4.
- EX stage: Executes the SUB operation, which takes 1 clock cycle.
- WB stage: Writes the result to register R6.

To determine the number of clock cycles, we need to consider the dependencies between the instructions. In this case, the MUL instruction depends on the result of the ADD instruction, and the SUB instruction depends on the result of the MUL instruction. However, since the processor uses operand forwarding, the results of the previous instructions can be forwarded to the subsequent instructions without waiting for them to be written back to the registers.

Therefore, the number of clock cycles required to complete the given sequence of instructions is as follows:

- Clock cycle 1: IF stage of ADD
- Clock cycle 2: ID stage of ADD
- Clock cycle 3: EX stage of ADD
- Clock cycle 4: WB stage of ADD
- Clock cycle 5: IF stage of MUL
- Clock cycle 6: ID stage of MUL
- Clock cycle 7: EX stage of MUL
- Clock cycle 8: EX stage of MUL
- Clock cycle 9: WB stage of MUL
- Clock cycle 10: IF stage of SUB
- Clock cycle 11: ID stage of SUB
- Clock cycle 12: EX stage of SUB
- Clock cycle 13: WB stage of SUB

Hence, it takes a total of 8 clock cycles to complete the given sequence of instructions. Therefore, the correct answer is option B) 8.

Answered by Gate Gurus · View profile

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Consider a pipelined processor with the following four stages: IF: Instruction Fetch ID: Instruction Decode and Operand Fetch EX: Execute WB: Write BackThe IF, ID and WB stages take one clock cycle each to complete the operation. The number of clock cycles for the EX stage depends on the instruction. The ADD and SUB instructions need 1 clock cycle and the MUL instruction needs 3 clock cycles in the EX stage. Operand forwarding is used in the pipelined processor. What is the number of clock cycles taken to complete the following sequence of instructions?ADD R2, R1, R0 R2 ← R1 + R0MUL R4, R3, R2 R4 ← R3 * R2SUB R6, R5, R4 R6 ← R5 - R4a)7b)8c)10d)14Correct answer is option 'B'. Can you explain this answer?

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Consider a pipelined processor with the following four stages: IF: Instruction Fetch ID: Instruction Decode and Operand Fetch EX: Execute WB: Write BackThe IF, ID and WB stages take one clock cycle each to complete the operation. The number of clock cycles for the EX stage depends on the instruction. The ADD and SUB instructions need 1 clock cycle and the MUL instruction needs 3 clock cycles in the EX stage. Operand forwarding is used in the pipelined processor. What is the number of clock cycles taken to complete the following sequence of instructions?ADD R2, R1, R0 R2 ← R1 + R0MUL R4, R3, R2 R4 ← R3 * R2SUB R6, R5, R4 R6 ← R5 - R4a)7b)8c)10d)14Correct answer is option 'B'. Can you explain this answer? for Computer Science Engineering (CSE) 2024 is part of Computer Science Engineering (CSE) preparation. The Question and answers have been prepared according to the Computer Science Engineering (CSE) exam syllabus. Information about Consider a pipelined processor with the following four stages: IF: Instruction Fetch ID: Instruction Decode and Operand Fetch EX: Execute WB: Write BackThe IF, ID and WB stages take one clock cycle each to complete the operation. The number of clock cycles for the EX stage depends on the instruction. The ADD and SUB instructions need 1 clock cycle and the MUL instruction needs 3 clock cycles in the EX stage. Operand forwarding is used in the pipelined processor. What is the number of clock cycles taken to complete the following sequence of instructions?ADD R2, R1, R0 R2 ← R1 + R0MUL R4, R3, R2 R4 ← R3 * R2SUB R6, R5, R4 R6 ← R5 - R4a)7b)8c)10d)14Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for Computer Science Engineering (CSE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider a pipelined processor with the following four stages: IF: Instruction Fetch ID: Instruction Decode and Operand Fetch EX: Execute WB: Write BackThe IF, ID and WB stages take one clock cycle each to complete the operation. The number of clock cycles for the EX stage depends on the instruction. The ADD and SUB instructions need 1 clock cycle and the MUL instruction needs 3 clock cycles in the EX stage. Operand forwarding is used in the pipelined processor. What is the number of clock cycles taken to complete the following sequence of instructions?ADD R2, R1, R0 R2 ← R1 + R0MUL R4, R3, R2 R4 ← R3 * R2SUB R6, R5, R4 R6 ← R5 - R4a)7b)8c)10d)14Correct answer is option 'B'. Can you explain this answer?.

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