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Towards Formally Verified Optimizing Compilation in Flight Control Software França, Ricardo Bedin Favre-Felix, Denis Leroy, Xavier Pantel, Marc Souyris, Jean Compiler verification avionics software WCET code optimization This work presents a preliminary evaluation of the use of the CompCert formally specified and verified optimizing compiler for the development of level A critical flight control software. First, the motivation for choosing CompCert is presented, as well as the requirements and constraints for safety-critical avionics software. The main point is to allow optimized code generation by relying on the formal proof of correctness instead of the current un-optimized generation required to produce assembly code structurally similar to the algorithmic language (and even the initial models) source code. The evaluation of its performance (measured using WCET) is presented and the results are compared to those obtained with the currently used compiler. Finally, the paper discusses verification and certification issues that are raised when one seeks to use CompCert for the development of such critical software. Schloss Dagstuhl – Leibniz-Zentrum für Informatik Ricardo Bedin França and Denis Favre-Felix and Xavier Leroy and Marc Pantel and Jean Souyris 2011 Is Part Of OASIcs, Volume 18, Bringing Theory to Practice: Predictability and Performance in Embedded Systems (2011) InProceedings Text doc-type:ResearchArticle publishedVersion application/pdf doi:10.4230/OASIcs.PPES.2011.59 urn:nbn:de:0030-drops-30824 https://drops.dagstuhl.de/entities/document/10.4230/OASIcs.PPES.2011.59 eng https://creativecommons.org/licenses/by-nc-nd/3.0/legalcode