I see this extension come up on printouts of device queries, but I cannot find what it does, or how to use it. I checked nVidia Programming Guide & Best Practices, but a search gets no hits. I checked Khronos OpenCL API Registry web page. Nothing there as well.
A web search only gets any hits in pages for CUDA. I guess that is where the options themselves are, but in any case it only mentions “cl_nv_compiler_options”, not how to use it.
I thought it might be a way to specify something like “-cl-nv-maxrregcount=32” inside a kernel. This might avoid getting an error on platforms like OSX when it is specified as a compiler option. Building kernel compiler options on the fly, based on the platform, is a pain. This is not going to do anybody much good unless someone can find how to use it.