Consider the following x86 machine instruction sequence:ADD EAX, EBXSUB ECX, EAXADD EBX, ECXThe first instruction adds the contents of the 32-bit registers EAX and EBX and stores the result in EAX. The second instruction subtracts the contents of EAX from ECX and stores the result in ECX. These instructions are to be executed in a pipelined instruction processor with the following 4 stages: fetch instruction (FI), decode instruction and calculate addresses (DA), fetch operand (FO), and execute (EX). The FI, DA and EX stages take 1 clock cycle each for any instruction. The FO stage takes 2 clock cycle for ADD and 3 clock cycle for SUB instruction. The pipelined processor uses operand forwarding from the FO stage to the DA stage. Calculate the number of clock cycles required for the execution of the above instructions.Correct answer is '10'. Can you explain this answer? - EduRev Computer Science Engineering (CSE) Question

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Consider the following x86 machine instruction sequence:

ADD EAX, EBX

SUB ECX, EAX

ADD EBX, ECX

The first instruction adds the contents of the 32-bit registers EAX and EBX and stores the result in EAX. The second instruction subtracts the contents of EAX from ECX and stores the result in ECX. These instructions are to be executed in a pipelined instruction processor with the following 4 stages: fetch instruction (FI), decode instruction and calculate addresses (DA), fetch operand (FO), and execute (EX). The FI, DA and EX stages take 1 clock cycle each for any instruction. The FO stage takes 2 clock cycle for ADD and 3 clock cycle for SUB instruction. The pipelined processor uses operand forwarding from the FO stage to the DA stage. Calculate the number of clock cycles required for the execution of the above instructions.

Correct answer is '10'. Can you explain this answer?

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Consider the following x86 machine instruction sequence:ADD EAX, EBXSU...

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Consider the following x86 machine instruction sequence:ADD EAX, EBXSU...

Given:
- x86 machine instruction sequence: ADD EAX, EBX; SUB ECX, EAX; ADD EBX, ECX
- 4 stages of pipelined instruction processor: FI, DA, FO, EX
- FI, DA, EX stages take 1 clock cycle each for any instruction
- FO stage takes 2 clock cycles for ADD and 3 clock cycles for SUB instruction
- Operand forwarding is used from the FO stage to the DA stage

To find:
- Number of clock cycles required for the execution of the instructions

Solution:
To calculate the number of clock cycles required for the execution of the instructions, we need to consider the pipelining and the dependencies between the instructions.

Step 1: FI stage
- The first instruction, ADD EAX, EBX, enters the pipeline in the FI stage.

Step 2: DA stage
- The ADD EAX, EBX instruction moves to the DA stage.
- The second instruction, SUB ECX, EAX, enters the pipeline in the FI stage.

Step 3: FO stage
- The ADD EAX, EBX instruction moves to the FO stage.
- The SUB ECX, EAX instruction moves to the DA stage.
- The third instruction, ADD EBX, ECX, enters the pipeline in the FI stage.

Step 4: EX stage
- The ADD EAX, EBX instruction moves to the EX stage.
- The SUB ECX, EAX instruction moves to the FO stage.
- The ADD EBX, ECX instruction moves to the DA stage.

Step 5: FI stage
- The ADD EAX, EBX instruction finishes execution and leaves the pipeline.
- The SUB ECX, EAX instruction moves to the EX stage.
- The ADD EBX, ECX instruction moves to the FO stage.

Step 6: DA stage
- The SUB ECX, EAX instruction finishes execution and leaves the pipeline.
- The ADD EBX, ECX instruction moves to the EX stage.

Step 7: FO stage
- The ADD EBX, ECX instruction finishes execution and leaves the pipeline.

Step 8: EX stage
- The SUB ECX, EAX instruction finishes execution and leaves the pipeline.

Step 9: FI stage
- The ADD EBX, ECX instruction finishes execution and leaves the pipeline.

Step 10: Pipeline completion
- All instructions have finished execution.

Number of clock cycles:
- The total number of clock cycles required for the execution of the instructions is 10.

Explanation:
- The pipelined processor allows multiple instructions to be executed simultaneously at different stages of the pipeline.
- While the first instruction is being executed in the EX stage, the second instruction can enter the FO stage,

Answered by Gate Gurus · View profile

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Consider the following x86 machine instruction sequence:ADD EAX, EBXSUB ECX, EAXADD EBX, ECXThe first instruction adds the contents of the 32-bit registers EAX and EBX and stores the result in EAX. The second instruction subtracts the contents of EAX from ECX and stores the result in ECX. These instructions are to be executed in a pipelined instruction processor with the following 4 stages: fetch instruction (FI), decode instruction and calculate addresses (DA), fetch operand (FO), and execute (EX). The FI, DA and EX stages take 1 clock cycle each for any instruction. The FO stage takes 2 clock cycle for ADD and 3 clock cycle for SUB instruction. The pipelined processor uses operand forwarding from the FO stage to the DA stage. Calculate the number of clock cycles required for the execution of the above instructions.Correct answer is '10'. Can you explain this answer?

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Consider the following x86 machine instruction sequence:ADD EAX, EBXSUB ECX, EAXADD EBX, ECXThe first instruction adds the contents of the 32-bit registers EAX and EBX and stores the result in EAX. The second instruction subtracts the contents of EAX from ECX and stores the result in ECX. These instructions are to be executed in a pipelined instruction processor with the following 4 stages: fetch instruction (FI), decode instruction and calculate addresses (DA), fetch operand (FO), and execute (EX). The FI, DA and EX stages take 1 clock cycle each for any instruction. The FO stage takes 2 clock cycle for ADD and 3 clock cycle for SUB instruction. The pipelined processor uses operand forwarding from the FO stage to the DA stage. Calculate the number of clock cycles required for the execution of the above instructions.Correct answer is '10'. 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 the following x86 machine instruction sequence:ADD EAX, EBXSUB ECX, EAXADD EBX, ECXThe first instruction adds the contents of the 32-bit registers EAX and EBX and stores the result in EAX. The second instruction subtracts the contents of EAX from ECX and stores the result in ECX. These instructions are to be executed in a pipelined instruction processor with the following 4 stages: fetch instruction (FI), decode instruction and calculate addresses (DA), fetch operand (FO), and execute (EX). The FI, DA and EX stages take 1 clock cycle each for any instruction. The FO stage takes 2 clock cycle for ADD and 3 clock cycle for SUB instruction. The pipelined processor uses operand forwarding from the FO stage to the DA stage. Calculate the number of clock cycles required for the execution of the above instructions.Correct answer is '10'. 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 the following x86 machine instruction sequence:ADD EAX, EBXSUB ECX, EAXADD EBX, ECXThe first instruction adds the contents of the 32-bit registers EAX and EBX and stores the result in EAX. The second instruction subtracts the contents of EAX from ECX and stores the result in ECX. These instructions are to be executed in a pipelined instruction processor with the following 4 stages: fetch instruction (FI), decode instruction and calculate addresses (DA), fetch operand (FO), and execute (EX). The FI, DA and EX stages take 1 clock cycle each for any instruction. The FO stage takes 2 clock cycle for ADD and 3 clock cycle for SUB instruction. The pipelined processor uses operand forwarding from the FO stage to the DA stage. Calculate the number of clock cycles required for the execution of the above instructions.Correct answer is '10'. Can you explain this answer?.

Solutions for Consider the following x86 machine instruction sequence:ADD EAX, EBXSUB ECX, EAXADD EBX, ECXThe first instruction adds the contents of the 32-bit registers EAX and EBX and stores the result in EAX. The second instruction subtracts the contents of EAX from ECX and stores the result in ECX. These instructions are to be executed in a pipelined instruction processor with the following 4 stages: fetch instruction (FI), decode instruction and calculate addresses (DA), fetch operand (FO), and execute (EX). The FI, DA and EX stages take 1 clock cycle each for any instruction. The FO stage takes 2 clock cycle for ADD and 3 clock cycle for SUB instruction. The pipelined processor uses operand forwarding from the FO stage to the DA stage. Calculate the number of clock cycles required for the execution of the above instructions.Correct answer is '10'. Can you explain this answer? in English & in Hindi are available as part of our courses for Computer Science Engineering (CSE). Download more important topics, notes, lectures and mock test series for Computer Science Engineering (CSE) Exam by signing up for free.

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