[vectorcamp]

I agree. Most developers don't need to write SIMD code. Some do however and those need good documentation to write good SIMD code, even more so when it comes to porting.

Interesting that you mention Eigen. Long before I started my company VectorCamp, wrote the original Altivec/VSX, Arm and Z ports for Eigen and it took me a lot more to do a proper port back then -iirc I started that effort in 2008- than it would take me now, because now the tools are far far better. I started this company to provide SIMD optimizations for all architectures and this tool SIMD.info began because I wanted to help other developers find the information that I wish I had back then. It's that simple.

For me and my company, anything that needs to be performant critical to be written in a compiled language like C, C++, Rust -and now Zig- is worth optimizing. How much depends on your time, money and skills. Not everything needs SIMD of course. But it's definitely NOT only for library and compiler developers. You would be surprised how much SIMD code is even in application code out there. It all depends on the expectations and the required performance. Also, some of the libraries don't utilize all available instructions.

My 2c.