Q21

MCQ1 mark, −0.33

An instruction format has the following structure: Instruction Number: Opcode destination reg, source reg- $1$ , source reg- $2$ Consider the following sequence of instructions to be executed in a pipelined processor: $\text{I 1: DIV R3, R1, R2}$ $\text{I 2: SUB R5, R3, R4}$ $\text{I 3: ADD R3, R5, R6}$ $\text{I 4: MUL R7, R3, R8}$ Which of the following statements is/are TRUE?

(A)

There is a RAW dependency on $\text{R 3}$ between $\text{I 1}$ and $\text{I 2}$

(B)

There is a WAR dependency on $\text{R 3}$ between $\text{I 1}$ and $\text{I 3}$

(C)

There is a RAW dependency on $\text{R 3}$ between $\text{I 2}$ and $\text{I 3}$

(D)

There is a WAW dependency on $\text{R 3}$ between $\text{I 3}$ and $\text{I 4}$

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