A long available tool has been AMD’s ROCm HIP that allows converting CUDA code to portable C++ code that in turn can be executed on Radeon GPUs. There is now work on getting the upstream LLVM Clang compiler’s CUDA toolchain support to also support HIP…

Source: Phoronix – Work Is Underway To Upstream LLVM Clang’s CUDA Toolchain For AMDGPU/HIP