Partial Evaluation in Dependently Typed Languages

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This project aims to explore the optimisation of dependently typed programming languages using partial evaluation. In addition to answering open researchquestions, the project will provide a concrete implementation of a partial evaluator for the Idris2 compiler. The project furthers the research already undertaken by Brady[4], aiming to make dependently typed languages practical forwriting everyday programs through the careful application of program optimisations.Partial evaluation (PE) is an optimisation technique which evaluates portionsof the program at compile time to produce a more efficient executable[7]. It is apowerful generalisation of constant folding, which allows programmers to writeidiomatic definitions without loss of performance. Many modern programminglanguages implement PE, with some inferring the areas of program to evaluate,and with others taking explicit guidance from the programmers (for example,C++11's constexpr keyword). The main drawback to partial evaluation is thatit can be very expensive for large programs, significantly increasing compilationtimes.