do I know anyone who has written a gcc or llvm backend for a new architecture (or a tutorial on how to do so) within the last several years?

I would like to compile C code into assembly for a toy architecture. I don't really care which toolchain I use, this is very results focused.

unfortunately the only tutorials I can find were written long enough ago that significant changes have been made to the toolchain codebase and even with educated guesses I'm hitting roadblocks at the first step.