What is loop unrolling? How you can speed up Mojo🔥 code with @unroll

Loop unrolling is a technique used to enhance program performance by minimizing the computational overhead associated with loop control instructions, albeit at the cost of increased code size. This process involves eliminating or reducing loop control structures by replicating the loop body multiple times, thereby benefiting performance-critical applications. In the Mojo programming language, loop unrolling can be achieved manually or through the use of language-specific features like the @unroll decorator, which offers programmers explicit control over the unrolling process. Mojo provides distinct features such as @unroll for full unrolling, @unroll(n) for unrolling with a specified factor, and an unroll() function for repeated function evaluation, allowing developers to balance performance gains against potential code size increases. This detailed control differentiates Mojo from traditional compilers, which often perform loop unrolling as part of automatic, less transparent optimization processes. Through these features, Mojo aims to give programmers more predictable and fine-grained control over their code's execution, facilitating better optimization strategies for specific performance requirements.