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Problem

Consider the following code and answer the following questions. Note that F2 register holds a scalar constant that cannot be changed for the computation (see MUL.D instruction)

DADDI R3,R0,8

DADDI R1,R0,1024

DADDI R2,R0,1024

Loop: L.D F0,0(R1)

MUL.D F0,F0,F2

L.D F4,0(R2)

ADD.D F0,F0,F4

S.D F0,0(R2)

DSUB R1,R1,R3

DSUB R2,R2,R3

BNEZ R1,Loop

HALT

(a) Re-arrange the loop without unrolling. You can move individual instructions, however the output of this dummy loop should be exactly the same i.e. adjust the offset for memory instructions (load/store). Show the rearranged loop. Can you reduce the stalls for this code?

(b) Now, transform the loop by unrolling the loop and reschedule the instructions to minimize stalls.

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Computer Engineering, Engineering

Category:- Computer Engineering
Reference No.:- M93091347

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