Consider a loop like this one:

for(i=0; i<100; i++){

A[i] = B[i] + C[i];

C[i] = B[i] + D[i];

C[i+1] = B[i] * D[i];

}

1). Unroll the loop by a factor of 2, write out the code for the new loop

2). What kind of dependences are there in the code of your answer to 1

3). Rewrite the code to eliminate as many dependences as possible.