Tim has been working on making it easy to use CUDA.jl and AMDGPU.jl pretty interchangeably through GPUArrays.jl, and this approach seems to be pretty extensible to other accelerators like Intel's dGPUs. KernelAbstractions.jl will also be gaining AMDGPU.jl support soon, so it'll be easy to write generic kernels without buying into a single vendor's cards.