It's useful in linear algebra implementations (if not necessarily using __builtin_prefetch). You can study the (micro-)architecture-dependent uses in e.g. http

It's useful in linear algebra implementations (if not necessarily using __builtin_prefetch). You can study the (micro-)architecture-dependent uses in e.g. https://github.com/flame/blis https://github.com/flame/blis https://github.com/xianyi/OpenBLAS https://github.com/xianyi/OpenBLAS and https://github.com/hfp/libxsmm https://github.com/hfp/libxsmm and it may be discussed in the papers describing them. libxsmm provides a view of the complexity outside "large" dimension BLAS.