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Those who released LLVM under a non-copyleft license <a href="https://www.anandtech.com/show/5238/nvidia-releases-cuda-41-cuda-goes-llvm-and-open-source-kind-of">enabled nVidia to release a high-quality nonfree compiler</a> for its GPUs, while keeping its instruction set secret. Thus, we can't write a free compiler for that platform without a big reverse engineering job. The nonfree adaptation of LLVM is the only compiler for those machines, and is likely to remain so. 
Intel uses <a href="https://www.tomshardware.com/news/google-removing-minix-management-engine-intel,35876.html">a proprietary version of the MINIX system</a>, which is free but not copylefted, in the Management Engine back door in its modern processors.