http://llvm.org/devmtg/2018-10/
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LLVM backend development by example (RISC-V)  - Alex Bradbury

Slides: 
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This tutorial steps through how to develop an LLVM backend for a modern RISC target (RISC-V). It will be of interest to anyone who hopes to implement a new backend, modify an existing backend, or simply better understand this part of the LLVM infrastructure. It provides a high level introduction to the MC layer, instruction selection, as well as small selection of represenative implementation challenges. No experience with LLVM backends is required, but a basic level of familiarity with LLVM IR would be useful.
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Videos Filmed & Edited by Bash Films: http://www.BashFilms.com