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In this talk, you will explore the basic operation of the main optimisations that GHC performs, what users should expect from the compiler and what options they have to control how the optimiser behaves. We will focus on core-to-core passes such as inlining, specialisation, SpecConstr, SAT and so on.
The aim of this talk is to make you think more carefully about how the compiler optimises their code. There will be lots of examples of real world code and toy examples which demonstrate how specific passes work. Ultimately by users better understanding the optimisation pipeline, I hope that library writers experience can feed back into making GHC better optimise modern Haskell code.
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Matthew is a PhD student at the University of Bristol and one of the core GHC contributors. His research interests are in program generation and multi-stage programming.