Lanai, the mystery CPU architecture in LLVM

Some of my recent long-term projects revolve around a little known CPU architecture called Lanai'. Unsurprisingly, very few people have heard of it, and even their Googling skills don't come in handy. This page is a short summary of what I know, and should serve as a reference for future questions.

Deeply fascinating. I love obscure CPU architectures, and they don't come more obscure than this.