I started to appreciate that compilers can do only as much and from my experience auto-vectorization doesn't really shine that much, it leaves a lot of performa

I started to appreciate that compilers can do only as much and from my experience auto-vectorization doesn't really shine that much, it leaves a lot of performance on the table, and then it also messes up with the hand optimized code. > So it really seems to be something Zen-specific and weird. Number and/or type of ports. Perhaps even the code generation is different so it could be the compiler backend differences too for different uarchs