Plasma on Wayland does have HDR support now… But I don’t have a way to test how good it is, and I think it’s both still unfinished and severely lacking support from applications. But hey, things are improving!
I wouldn’t count on Adobe support though.
I might be wrong, but doesn’t SSE require you to explicitly use it in C/C++? Laying out your data as arrays and specifically calling the SIMD operations on them?