Use sensible Fortran flags
At the moment the fortran code is compiled with minimal flags, and therefore the compiler has its hands tied. However, the code is written in a way which should be easily vectorisable by the compiler.
Ekatherine from RSC is currently testing:
-xCORE-AVX512 -fma -align array64byte
and has mentioned that
-qopt-prefetch=3 worked well with the prototype code.
To be updated...