1. LD R1, 45(R2) 2. DADD R7, R1, R5 3. DSUB R8, R1, R6 4. OR R9, R5, R1 5. DADD

Question

1. LD R1, 45(R2)

2. DADD R7, R1, R5

3. DSUB R8, R1, R6

4. OR R9, R5, R1

5. DADD R10, R8, R5

6. XOR R2, R3, R4

By using the above code, answer the followingquestions:

Q.1. identify each dependency by type; list the twoinstructions involved; identify which instruction is dependent; andname the storage location involved. [5]

Q.2 Draw the 5 stage pipelined diagram using“Forwarding” and without using“Forwarding”. [10+10].

Note: One solved template example is givenbelow, you can do question#2 according to this format.

You are required to visit the following internet link beforestarting the assignment.

http://en.wikipedia.org/wiki/Instruction_pipeline

Explanation / Answer

1. LD R1, 45 (R2)

                                            Instruction 2 is dependant on1 waiting for R1 value

2. DADD R7, R1,R5           

3. DSUB R8, R1,R6           Instruction 3 is dependent on1 waiting for R1 value

4. Or R9, R5,R1                 Instruction 4 is dependent on 1 waiting for R1 value

5. BNEZ R7,target             Instruction 5 is dependent on 2 waiting for R7 value

6. DADD R10, R8,R5         Instruction 6 isdependent on 3 waiting for R8 value

Control dependences : -

2. DADD R7, R1, R5

                                              Instruction 2 is dependent on 1 waiting for R7 value

3. BNEZ R7, target

Execution of instructions 6,7 is dependent on branchinstruction

If BNEZ (R7 0) is true, then the statements at the labeltarget get executed

Else statements 6, 7 get executed

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