Michal,Support for AMD through HIP is very high on my todo list but the compiler is not that great right now, i.e. the compiler can (and will) generate buggy code.
I've tried to hipify the code a few months ago but it didn't go too well. My plan is to work on support for AMD after we branch the release so that we don't have to support buggy compilers. I am pretty confident that we will have support for HIP by the end of the Summer maybe earlier.
Best,Bruno