From highway:

> Does what you expect: Highway is a C++ library with carefully-chosen functions that map well to CPU instructions without extensive compiler transformations. The resulting code is more predictable and robust to code changes/compiler updates than autovectorization.

So C compilers are not a good place to start if one wants to write a compiler for an array language (which naturally expresses SIMD calculations). Which is what I point out in the last paragraph of the blog post:

> To some extent this percolates compilers textbooks. Array languages naturally express SIMD calculations; perhaps there are more fluent methods for compilation (and better data structures for export à la object files).

It is more like, ISO C++ with compiler extensions does ok.