https://llvm.org/devmtg/2014-10/
—
Building an LLVM Backend  - Fraser Cormack, Pierre-André Saulais

Slides: http://llvm.org/devmtg/2014-10/Slides/Cormack-BuildingAnLLVMBackend.pdf
—
This talk explains how to get started with building a LLVM backend for a new architecture. It shows how LLVM transforms programs through the back-end compilation pipeline and what needs implementing for a new target. Practical debugging tips, as well as solutions to common issues are given. No LLVM backend experience is needed, but experience with LLVM IR is recommended.
—