Consider the following code for the following problems loop: LW R4, 0(R3) ADDI R

Question

Consider the following code for the following problems

loop: LW R4, 0(R3)

ADDI R3, R3, 4

SUBI R1, R1, 1

b1: b2: BEQ R0, R4, b2 # R0 is zero

ADDI R2, R2, 1

BNE R0, R1, loop

ADDI R3, R3, 4
Assume R3 points to the array with all 0 entries. R1 = R2 = 5.

a) If there is a branch delay slot and result of R2 stays even after branch is taken. What is the value of R2 when the loop finishes?

b) If there is no branch delay slot, what is the value of R2 when the loop finishes?

c) Which behavior makes the most sense?

Explanation / Answer

(a)
R2 value would be 6 at end of loop.

(b)
R2 value would be 6 at end of loop.

(c)
Since R2 is not being used anywhere within the loop except incrementing it,
both the behaviours make sense.

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