> While Google did developed a PTX backend for LLVM, the student that worked on that as part of a GSOC got later hired by NVIDIA, and ended up contributing the current NVPTX backend that clang uses today.

You more or less reformalized what I said. It might become used one day behind a proprietary blob, rebranded blob of NVidia, but fact is that today, close to nobody use it for production in the wild and it is not even supported officially.

> This is false. The NV part of the backend name (NVPTX) literally brands this backend as NVIDIAs PTX backend.

It does not mean it's stable or used. I do not now a single major GPGPU software in existence that ever used it in an official distribution. Like I said.

> CUDA Fortran just fine

CUDA fortran, yes you said it, CUDA fortran. The rest is OpenACC.

> The Parallel STL work actually originated with the GCC parallel STL, the Intel TBB, and NVIDIA Thrust libraries

My apologies for that. I was ignoring this precedent work.

> AMD is nowhere to be found in this type of work.

I do not think I ever said anything about AMD.