This question:
Does NVidia support OpenCL SPIR?
was asked 5 years ago. Since then, NVIDIA support for Khronos OpenCL has improved over this period, and it has also adopted Khronos Vulkan (of which I know little), I was wondering whether things had changed w.r.t. SPIR (the Khronos standards equivalent of PTX, if you will) as well.
No change. NVIDIA does not support the cl_khr_spir extension ("SPIR 1.2") in their otherwise nice OpenCL 1.2 drivers (and SPIR-V is a 2.x thing, so also not supported).