RMK007: SIMD opportunity a within multi-threaded region

Issue

There is a SIMD vectorization opportunity within a multi-threaded region.

Actions

Add vectorization directives to instruct the compiler to vectorize the loop.

Relevance

SIMD vectorization is performed at the lowest level in hardware and is usually compatible with higher forms of parallelization. In this case, it could potentially be used to further increase the performance of a multi-threaded computation.