Consider a 5-stage pipeline - IF (Instruction Fetch), ID (Instruction Decode and register read), EX (Execute), MEM (memory), and WB (Write Back). All (memory or register) reads take place in the second phase of a clock cycle and all writes occur in the first phase. Consider the execution of the following instruction sequence:a. Show all data dependencies between the four instructions.b. Identify the data hazards.c. Can all hazards be avoided by forwarding in this case.Correct answer is 'ANS'. Can you explain this answer? - EduRev Computer Science Engineering (CSE) Question

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a. Show all data dependencies between the four instructions.
b. Identify the data hazards.
c. Can all hazards be avoided by forwarding in this case.

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

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Test: Pipelining- 1

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Consider a 5-stage pipeline - IF (Instruction Fetch), ID (Instruction ...

4 RAW

3 WAR

With operand forwarding:

Without it:
(both tables represent the same pipeline)

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Consider a pipelined processor operating at 2 GHZ with 5 stages, Instruction fetch (IF), Instruction decode (ID), Execute (EX), Memory access (MEM), and write back (WB). Each stage of the pipeline, except the EX stage, takes one cycle. The EX takes one cycle for ADD and SUB, three cycles for MUL, two cycles for DIV Instruction.Consider the following instructions:Find, the number of true data dependences in the above code and the execution time using operand forwarding technique respectively is______.

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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

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The instruction pipeline of a RISC processor has the following stages: Instruction Fetch (IF), Instruction Decode (ID), Operand Fetch (OF), Perform Operation (PO) and Writeback (WB), The IF, ID, OF and WB stages take 1 clock cycle each for every instruction. Consider a sequence of 100 instructions. In the PO stage, 40 instructions take 3 clock cycles each, 35 instructions take 2 clock cycles each, and the remaining 25 instructions take 1 clock cycle each. Assume that there are no data hazards and no control hazards. The number of clock cycles required for completion of execution of the sequence of instruction is ______ .Note -This was Numerical Type 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 + 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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Consider a 5-stage pipeline - IF (Instruction Fetch), ID (Instruction Decode and register read), EX (Execute), MEM (memory), and WB (Write Back). All (memory or register) reads take place in the second phase of a clock cycle and all writes occur in the first phase. Consider the execution of the following instruction sequence:a. Show all data dependencies between the four instructions.b. Identify the data hazards.c. Can all hazards be avoided by forwarding in this case.Correct answer is 'ANS'. Can you explain this answer?

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