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Improving WCET Evaluation using Linear Relation Analysis

Authors Pascal Raymond , Claire Maiza , Catherine Parent-Vigouroux , Erwan Jahier , Nicolas Halbwachs , Fabienne Carrier, Mihail Asavoae, Rémy Boutonnet

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Pascal Raymond
  • Univ. Grenoble Alpes, CNRS, Grenoble INP (Institute of Engineering Univ. Grenoble Alpes), VERIMAG, Grenoble, France
Claire Maiza
  • Univ. Grenoble Alpes, CNRS, Grenoble INP (Institute of Engineering Univ. Grenoble Alpes), VERIMAG, Grenoble, France
Catherine Parent-Vigouroux
  • Univ. Grenoble Alpes, CNRS, Grenoble INP (Institute of Engineering Univ. Grenoble Alpes), VERIMAG, Grenoble, France
Erwan Jahier
  • Univ. Grenoble Alpes, CNRS, Grenoble INP (Institute of Engineering Univ. Grenoble Alpes), VERIMAG, Grenoble, France
Nicolas Halbwachs
  • Univ. Grenoble Alpes, CNRS, Grenoble INP (Institute of Engineering Univ. Grenoble Alpes), VERIMAG, Grenoble, France
Fabienne Carrier
  • Univ. Grenoble Alpes, CNRS, Grenoble INP (Institute of Engineering Univ. Grenoble Alpes), VERIMAG, Grenoble, France
Mihail Asavoae
  • Univ. Grenoble Alpes, CNRS, Grenoble INP (Institute of Engineering Univ. Grenoble Alpes), VERIMAG, Grenoble, France
Rémy Boutonnet
  • Univ. Grenoble Alpes, CNRS, Grenoble INP (Institute of Engineering Univ. Grenoble Alpes), VERIMAG, Grenoble, France

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Pascal Raymond, Claire Maiza, Catherine Parent-Vigouroux, Erwan Jahier, Nicolas Halbwachs, Fabienne Carrier, Mihail Asavoae, and Rémy Boutonnet. Improving WCET Evaluation using Linear Relation Analysis. In LITES, Volume 6, Issue 1 (2019). Leibniz Transactions on Embedded Systems, Volume 6, Issue 1, pp. 02:1-02:28, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019) https://doi.org/10.4230/LITES-v006-i001-a002

Abstract

The precision of a worst case execution time (WCET) evaluation tool on a given program is highly dependent on how the tool is able to detect and discard semantically infeasible executions of the program. In this paper, we propose to use the classical abstract interpretation-based method of linear relation analysis to discover and exploit relations between execution paths. For this purpose, we add auxiliary variables (counters) to the program to trace its execution paths. The results are easily incorporated in the classical workflow of a WCET evaluator, when the evaluator is based on the popular implicit path enumeration technique. We use existing tools - a WCET evaluator and a linear relation analyzer - to build and experiment a prototype implementation of this idea.

Subject Classification

ACM Subject Classification
  • Software and its engineering → Real-time systems software
Keywords
  • Worst Case Execution Time estimation
  • Infeasible Execution Paths
  • Abstract Interpretation

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