By Paul Lokuciejewski
ISBN-10: 904819928X
ISBN-13: 9789048199280
ISBN-10: 9048199298
ISBN-13: 9789048199297
For real-time platforms, the worst-case execution time (WCET) is the major aim to be thought of. often, code for real-time platforms is generated with no taking this target into consideration and the WCET is computed in basic terms after code new release. Worst-Case Execution Time acutely aware Compilation thoughts for Real-Time Systems provides the 1st accomplished method integrating WCET concerns into the code iteration strategy. in keeping with the proposed reconciliation among a compiler and a timing analyzer, quite a lot of novel optimization concepts is supplied. between others, the strategies disguise resource code and meeting point optimizations, make the most computer studying thoughts and handle the layout of contemporary structures that experience to satisfy a number of objectives.
Using those optimizations, the WCET of real-time functions will be decreased via approximately 30% to forty five% at the general. This opens possibilities for reducing clock speeds, expenditures and effort intake of embedded processors. The proposed suggestions can be utilized for every type real-time structures, together with automobile and avionics IT systems.
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Additional resources for Worst-Case Execution Time Aware Compilation Techniques for Real-Time Systems
Sample text
This information is usually hard to compute manually and, if known anyway, its propagation to aiT would require a tedious and error-prone specification via a file interface. 3 Import of Worst-Case Execution Data The last step of the integration of a timing analyzer into the compiler is the import of the worst-case timing data computed by aiT into the backend. For that purpose, the final CRL2 file, which represents the program’s CFG enriched with WCET data, is traversed. 1, a mapping between basic blocks of both IRs is established enabling an exchange of WCET data.
1 Introduction Most embedded/cyber-physical systems have to respect timing constraints. System designers attempt to reduce the WCET of these systems since its reduction leads to a cut in the production costs: slower and cheaper processors can be used that P.
1 Compiler Frontend ICD-C IR . . . . . . 2 Standard Source Code Level Optimizations . . 3 Code Selector . . . . . . . . . . 4 Compiler Backend LLIR . . . . . . . 5 Standard Assembly Level Optimizations . . . 6 Code Generator . . . . . . . . . . 4 Integration of WCET Analyzer . . . . . . . . 1 Conversion from LLIR to CRL2 . . . . . 2 Invocation of aiT . . . . . . . . . 3 Import of Worst-Case Execution Data . . . . 5 Modeling of Flow Facts .