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 isa)10b)12c)14d)16Correct answer is option 'B'. Can you explain this answer? - EduRev Computer Science Engineering (CSE) Question

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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 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 + R1
MUL R6, R2, R5 ; R6 → R2 * R5
SUB R5, R3, R6 ; R5 → R3 - R6
DIV R6, R5, R4 ; R6 → R5/R4
STORE R6, X ; X ← R6
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)
10
b)
12
c)
14
d)
16

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

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A pipelined processor uses a 4-stage instruction pipeline with the fol...

This is what i have solved. so answer is 12

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Understanding the Pipelined Execution
In a 4-stage pipelined processor, we have the following stages: Instruction Fetch (IF), Instruction Decode (ID), Execute (EX), and Writeback (WB). Each stage takes 1 clock cycle, except for MUL and DIV, which take 3 cycles.
Instruction Breakdown
1. ADD R5, R0, R1
- Takes 1 cycle in IF, ID, EX, and 1 cycle in WB (Total: 4 cycles).
2. MUL R6, R2, R5
- Takes 1 cycle in IF, ID, 3 cycles in EX, and 1 cycle in WB (Total: 6 cycles).
3. SUB R5, R3, R6
- Takes 1 cycle in IF, ID, EX, and 1 cycle in WB (Total: 4 cycles).
4. DIV R6, R5, R4
- Takes 1 cycle in IF, ID, 3 cycles in EX, and 1 cycle in WB (Total: 6 cycles).
5. STORE R6, X
- Takes 1 cycle in IF, ID, EX, and 1 cycle in WB (Total: 4 cycles).
Pipelining and Clock Cycles
- The pipeline can overlap the execution of instructions.
- Each instruction progresses through the stages simultaneously, and the total cycles will be determined by the longest EX stage.
Cycle Calculation
- The critical path is defined by the longest operation, which is MUL (6 cycles) and DIV (6 cycles).
- Thus, the total number of clock cycles required to complete all instructions is determined by the longest EX stages, plus the time taken for the first instruction to complete its WB stage.
Total Clock Cycle Count
- The total clock cycles required:
- 1 (IF for ADD) + 1 (ID for ADD) + 1 (EX for ADD) + 1 (WB for ADD)
- + 1 (IF for MUL, overlaps with ID for ADD)
- + 1 (ID for MUL) + 3 (EX for MUL) + 1 (WB for MUL)
- + 1 (IF for SUB, overlaps with ID for MUL)
- + 1 (ID for SUB) + 1 (EX for SUB) + 1 (WB for SUB)
- + 1 (IF for DIV, overlaps with ID for SUB)
- + 1 (ID for DIV) + 3 (EX for DIV) + 1 (WB for DIV)
- + 1 (IF for STORE, overlaps with ID for DIV)
- + 1 (ID for STORE) + 1 (EX for STORE) + 1 (WB for STORE)
The total comes up to 12 cycles.
Thus, the correct answer is 12 cycles (option b).

Answered by Gate Gurus · View profile

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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 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 isa)10b)12c)14d)16Correct answer is option 'B'. Can you explain this answer?

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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 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 isa)10b)12c)14d)16Correct 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 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 isa)10b)12c)14d)16Correct 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 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 isa)10b)12c)14d)16Correct answer is option 'B'. Can you explain this answer?.

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Can you explain this answer? theory, EduRev gives you an ample number of questions to practice 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 isa)10b)12c)14d)16Correct answer is option 'B'. Can you explain this answer? tests, examples and also practice Computer Science Engineering (CSE) tests.

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