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...it might be a different story to if one were getting up to speed on how compilers work by starting with LLVM (which sounds like it might be the case here). Certainly in looking at the LLVM code in areas I don't know about there is the undeniable fact that one is trying to understand _production optimized_ code at the same time as trying to understand the basic concepts the code implements, which is harder than learning about the concepts from more basic code then studying a better implementation. I don't know of a book, but as a suggestion: is there anyone who's teaching a course on compiler...

If you wanted to write a new register allocator, that would be a different story. Then you would do well to read the literature to try and understand about various schemes that have already been invented. No need to reinvent the wheel. Most people doing a port can figure things out by just using their brain and the documentation already at the LLVM web site; but like I said, a good solid