Short answers questions. a. True or false: It is of equal importance to eliminat

Question

Short answers questions.

a. True or false: It is of equal importance to eliminate nop instructions whether they occur inside a loop or immediately following an annulled branching instruction at the end of a loop.

b. Why do we not allow memory to memory operations for the SPARC machine?

c. Can we replace mov %o1, %o2 with add %o1, %g0, %o2?

d. Consider the following code as stored in the designated addresses. Provide the values of %r1 and %r2 after tracing the code.

mov 22, %r1

mov 35, %r2

subcc %r1, %r2, %r2

bg else

add %r2, 5, %r2

subcc %r1, 3, %r1

ba done

clr %r1

else: add %r2, 5, %r2

done: nop

Explanation / Answer

1. True

2. Because it has a very large latency to do this operation which will effect the performance of the machine. There is a swap instruction in sparc architecture.

3. Yes it is possible in sparc machines.

4. r1 should be 0 and r2 should be 40.

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