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I agree, AMD is working on making it easy to port CUDA[1], which still doesn't provide a strict alternative, but it's something

Google also released GPUCC (http://research.google.com/pubs/pub45226.html), and got CUDA support into upstream clang.

LLVM also has an AMD GPU backend, and says this thing is built on clang/llvm.

So i suspect it's based on that support :)

But yeah this isn't production ready