As mentioned ("re-include our source file"), we are indeed able to put the SIMD code, as well as the self-#include of itself, in a load.cxx TU.
Here is an example: https://github.com/google/gemma.cpp/blob/9dfe2a76be63bcfe679...
Here is an example: https://github.com/google/gemma.cpp/blob/9dfe2a76be63bcfe679...
Let's stop here, it doesn't seem like we understand each other.