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WCET-aware Code Generation and Communication Optimization for Parallelizing Compilers

High performance demands of present and future embedded applications increase the need for multi-core processors in hard real-time systems. Challenges in static multi-core WCET-analysis and the more complex design of parallel software, however, oppose the adoption of multi-core processors in that area. Automated parallelization is a promising approach to solve these issues, but specialized solutions are required to preserve static analyzability. With a WCET-aware parallelizing transformation, this work presents a novel solution for an important building block of a real-time capable parallelizing compiler. The approach includes a technique to optimize communication and synchronization in the parallelized program and supports complex memory hierarchies consisting of both shared and core-private memory segments. In an experiment with four different applications, the parallelization improved the WCET by up to factor 3.2 on 4 cores. The studied optimization technique and the support for shared memories significantly contribute to these results.