1. Loop unrolling was described in Chapter 4. Unroll and optimize the loop above so that each…

1. Loop unrolling was described in Chapter  4. Unroll and optimize the loop above so that each unrolled loop handles three iterations of the original loop. Show where this code stalls and calculate the number of cycles required to execute.

2. The unrolling from Exercise 6.4.5. works nicely because we happen to want a multiple of three iterations. What happens if the number of iterations is not known at compile time? How can we efficiently handle a number of iterations that isn’t a multiple of the number of iterations per unrolled loop?

Exercise 6.4.5.

Loop unrolling was described in Chapter  4. Unroll and optimize the loop above so that each unrolled loop handles three iterations of the original loop. Show where this code stalls and calculate the number of cycles required to execute.

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