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Erschienen in:
2014 | OriginalPaper | Buchkapitel
A New GCC Plugin-Based Compiler Pass to Add Support for Thread-Level Speculation into OpenMP
verfasst von : Sergio Aldea, Alvaro Estebanez, Diego R. Llanos, Arturo Gonzalez-Escribano
Erschienen in: Euro-Par 2014 Parallel Processing
Verlag: Springer International Publishing
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In this paper we propose a compile-time system that adds support for Thread-Level Speculation (TLS) into OpenMP. Our solution augments the original user code with calls to a TLS library that handles the speculative parallel execution of a given loop, with the help of a new OpenMP
speculative
clause for variable usage classification. To support it, we have developed a plugin-based compiler pass for GCC that augments the code of the loop. With this approach, we only need one additional code line to speculatively parallelize the code, compared with the tens or hundreds of changes needed (depending on the number of accesses to speculative variables) to manually apply the required transformations. Moreover, the plugin leads to a faster performance than the manual parallelization.