CUDA itself only got bumped from LLVM 5 to LLVM 7 in CUDA 11.2 (https://developer.nvidia.com/blog/boosting-productivity-and-performance-with-the-nvidia-cuda-11-

CUDA itself only got bumped from LLVM 5 to LLVM 7 in CUDA 11.2 (https://developer.nvidia.com/blog/boosting-productivity-and-performance-with-the-nvidia-cuda-11-2-c-compiler/ https://developer.nvidia.com/blog/boosting-productivity-and-...). LLVM 7 opt-in for OpenCL happened some time later (available since r510). What changes now is that LLVM 7 is the new default.