Well, they kinda have it with their hipify tool, although this is for porting CUDA code to AMD's HIP which supports both AMD and NVIDIA. This supports CUDA C code and libraries with AMD equivalents like cuDNN, cuBLAS, cuRAND, but doesn't support porting of CUDA C inline PTX assembler. AMD have their own inline GCN assembler, but seem to discourage it's use.

There are also versions of PyTorch, TensorFlow and JAX with AMD support.

PyTorch's torch.compile can generate Triton (OpenAI's GPU compiler) kernels, with Triton also supporting AMD.