Cuda is a programming language. You implement it like any other. The docs are a bit sparse but not awful. Targeting amdgpu is probably about as difficult as targeting x64, mostly changes the compiler runtime.
The online ptx implementation is notable for being even more annoying to deal with than the cuda, but it's just bytes in / different bytes out. No magic.
The online ptx implementation is notable for being even more annoying to deal with than the cuda, but it's just bytes in / different bytes out. No magic.