http://www.LLVM.org/devmtg/2017-10/
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Tutorial: Head First into GlobalISel  - Daniel Sanders, Aditya Nandakumar and Justin Bogner

Slides: http://llvm.org/devmtg/2017-10/slides/Bogner-Nandakumar-Sanders-Head%20First%20into%20GlobalISel.pdf
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GlobalISel has been getting a lot of attention lately, and by now you're probably wondering when and how you'll need to port your own favourite backend. We'll ignore the when for now, but in this tutorial we'll dive head first into implementing a GlobalISel backend. Starting with a brief overview of the GlobalISel pipeline, we'll go through concrete examples of how to approach implementing each of the instruction selection phases in a simple backend. As this unfolds, we'll point out some of the gotchas and corner cases you might run into as well as commenting on tools, diagnostics, and the burgeoning best practices of GlobalISel development. At the end of this talk, we hope you'll feel comfortable tackling porting your own backend to GlobalISel.
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