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Verified Compilation and Optimization of Floating-Point Programs in CakeML (Artifact) Becker, Heiko Rabe, Robert Darulova, Eva Myreen, Magnus O. Tatlock, Zachary Kumar, Ramana Tan, Yong Kiam Fox, Anthony compiler verification compiler optimization floating-point arithmetic Verified compilers such as CompCert and CakeML have become increasingly realistic over the last few years, but their support for floating-point arithmetic has thus far been limited. In particular, they lack the "fast-math-style" optimizations that unverified mainstream compilers perform. Supporting such optimizations in the setting of verified compilers is challenging because these optimizations, for the most part, do not preserve the IEEE-754 floating-point semantics. However, IEEE-754 floating-point numbers are finite approximations of the real numbers, and we argue that any compiler correctness result for fast-math optimizations should appeal to a real-valued semantics rather than the rigid IEEE-754 floating-point numbers. This document describes the artifact for RealCake, an extension of CakeML that achieves end-to-end correctness results for fast-math-style optimized compilation of floating-point arithmetic. This result is achieved by giving CakeML a flexible floating-point semantics and integrating an external proof-producing accuracy analysis. RealCake’s end-to-end theorems relate the I/O behavior of the original source program under real-number semantics to the observable I/O behavior of the compiler generated and fast-math-optimized machine code. Schloss Dagstuhl – Leibniz-Zentrum für Informatik Heiko Becker and Robert Rabe and Eva Darulova and Magnus O. Myreen and Zachary Tatlock and Ramana Kumar and Yong Kiam Tan and Anthony Fox 2022 Is Part Of DARTS, Volume 8, Issue 2, Special Issue of the 36th European Conference on Object-Oriented Programming (ECOOP 2022) Article Text doc-type:ResearchArticle publishedVersion application/pdf doi:10.4230/DARTS.8.2.10 urn:nbn:de:0030-drops-162086 https://drops.dagstuhl.de/entities/document/10.4230/DARTS.8.2.10 eng https://creativecommons.org/licenses/by/4.0/legalcode