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A modular memory optimization for synchronous data-flow languages: application to arrays in a lustre compiler

Léonard Gérard 1 Adrien Guatto 1 Cédric Pasteur 1 Marc Pouzet 1 
1 Parkas - Parallélisme de Kahn Synchrone
DI-ENS - Département d'informatique - ENS Paris, Inria Paris-Rocquencourt, CNRS - Centre National de la Recherche Scientifique : UMR 8548
Abstract : The generation of efficient sequential code for synchronous data-flow languages raises two intertwined issues: control and memory optimization. While the former has been extensively studied, for instance in the compilation of Lustre and Signal, the latter has only been addressed in a restricted manner. Yet, memory optimization becomes a pressing issue when arrays are added to such languages. This article presents a two-level solution to the memory optimization problem. It combines a compile-time optimization algorithm, reminiscent of register allocation, paired with language annotations on the source given by the designer. Annotations express in-place modifications and control where allocation is performed. Moreover, they allow external functions performing in-place modifications to be safely imported. Soundness of annotations is guaranteed by a semilinear type system and additional scheduling constraints. A key feature is that annotations for well-typed programs do not change the semantics of the language: removing them may lead to less efficient code but will not alter the semantics. The method has been implemented in a new compiler for a LUSTRE-like synchronous language extended with hierarchical automata and arrays. Experiments show that the proposed approach removes most of the unnecessary array copies, resulting in faster code that uses less memory.
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Submitted on : Thursday, September 6, 2012 - 12:04:53 PM
Last modification on : Thursday, March 17, 2022 - 10:08:43 AM




Léonard Gérard, Adrien Guatto, Cédric Pasteur, Marc Pouzet. A modular memory optimization for synchronous data-flow languages: application to arrays in a lustre compiler. Proceedings of the 13th ACM SIGPLAN/SIGBED International Conference on Languages, Compilers, Tools and Theory for Embedded Systems, Jun 2012, Beijing, China. pp.51--60, ⟨10.1145/2248418.2248426⟩. ⟨hal-00728527⟩



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