Add qsort for _Float16 using AVX-512 FP16 ISA

[r-devulap]

• Add new file avx512fp16-16bit-qsort.hpp
• Add new tests for _Float16 on SPR
• Update meson and Make build

[thac0]

Some comments from the peanut gallery. 😁

If you'd like, I could post a companion PR, if you'd like to see how I'd do the meson coding... but only if you're interested.

[thac0]

That'll bite if others don't use the exact same distro and packaging as you. Best not to hard-assign the compiler in a Makefile.

Continue to use ?= so the end-user can override (with, say, g++-12) in an env var.

[r-devulap]

-march=sapphirerapids is supported only with g++-12 and above and adding conditional compile in Make is non trivial, at least to me :) The main build system is Meson anyway which handles this relatively easy.

[thac0]

Not just you 😁 . "Read the docs, provide path to compiler that support the following flags" is about all you can do with a custom Makefile.

[thac0]

These can all be assigned to one variable, using a single include_directories() invocation with an array.