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Modular, higher order cardinality analysis in theory and practice

Part of: JFP Research Articles

Published online by Cambridge University Press:  16 February 2017

ILYA SERGEY ,
DIMITRIOS VYTINIOTIS ,
SIMON L. PEYTON JONES  and
JOACHIM BREITNER
ILYA SERGEY
Affiliation:
University College London, London, UK (e-mail: i.sergey@ucl.ac.uk)
DIMITRIOS VYTINIOTIS
Affiliation:
Microsoft Research, Cambridge, UK (e-mail: dimitris@microsoft.com, simonpj@microsoft.com)
SIMON L. PEYTON JONES
Affiliation:
Microsoft Research, Cambridge, UK (e-mail: dimitris@microsoft.com, simonpj@microsoft.com)
JOACHIM BREITNER
Affiliation:
University of Pennsylvania, Pennsylvania, USA (e-mail: joachim@cis.upenn.edu)
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Abstract

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Since the mid '80s, compiler writers for functional languages (especially lazy ones) have been writing papers about identifying and exploiting thunks and lambdas that are used only once. However, it has proved difficult to achieve both power and simplicity in practice. In this paper, we describe a new, modular analysis for a higher order language, which is both simple and effective. We prove the analysis sound with respect to a standard call-by-need semantics, and present measurements of its use in a full-scale, state-of-the-art optimising compiler. The analysis finds many single-entry thunks and one-shot lambdas and enables a number of program optimisations. This paper extends our preceding conference publication (Sergey et al. 2014 Proceedings of the 41st Annual ACM SIGPLAN-SIGACT Symposium on Principles of Programming Languages (POPL 2014). ACM, pp. 335–348) with proofs, expanded report on evaluation and a detailed examination of the factors causing the loss of precision in the analysis.

Type
Articles
Information
Journal of Functional Programming , Volume 27 , 2017 , e11
Copyright
Copyright © Cambridge University Press 2017 

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