Question

Which loop transformations have several instances of the loop body?

(a) loop fusion

(b) loop unrolling

(c) loop fission

(d) loop tiling

The question was posed to me in an online interview.

My question is taken from High Level Optimization in portion Implementing Embedded System: Hardware/Software Codesign of Embedded Systems

Answer 1

The correct answer is (b) loop unrolling

To elaborate: The loop unrolling is a standard transformation which creates several instances of the loop body and the number of copies of the loop is known as the unrolling factor.