UGC NET CSE | December 2015 | Part 2 | Question: 41

Question

Loop unrolling is a code optimization technique:

• A. that avoids tests at every iteration of the loop
• B. that improves preformance by decreasing the number of instructions in a basic block
• C. that exchanges inner loops with outer loops
• D. that reorders operations to allow multiple computations to happen in parallel

Answer 1

ans should be A

Lopp unrolling is used to reduce the number of jump & branch instructions which could potentially make the loop faster but will increase the size of the the binary. Depending on the implementation and platform, either could be faster.