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<button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2402.00986">arXiv:2402.00986</a> <span> [<a href="https://arxiv.org/pdf/2402.00986">pdf</a>, <a href="https://arxiv.org/format/2402.00986">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Programming Languages">cs.PL</span> </div> </div> <p class="title is-5 mathjax"> The Parallel Semantics Program Dependence Graph </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cs?searchtype=author&query=Homerding%2C+B">Brian Homerding</a>, <a href="/search/cs?searchtype=author&query=Patel%2C+A">Atmn Patel</a>, <a href="/search/cs?searchtype=author&query=Deiana%2C+E+A">Enrico Armenio Deiana</a>, <a href="/search/cs?searchtype=author&query=Su%2C+Y">Yian Su</a>, <a href="/search/cs?searchtype=author&query=Tan%2C+Z">Zujun Tan</a>, <a href="/search/cs?searchtype=author&query=Xu%2C+Z">Ziyang Xu</a>, <a href="/search/cs?searchtype=author&query=Godala%2C+B+R">Bhargav Reddy Godala</a>, <a href="/search/cs?searchtype=author&query=August%2C+D+I">David I. August</a>, <a href="/search/cs?searchtype=author&query=Campanoni%2C+S">Simone Campanoni</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2402.00986v1-abstract-short" style="display: inline;"> A compiler's intermediate representation (IR) defines a program's execution plan by encoding its instructions and their relative order. Compiler optimizations aim to replace a given execution plan with a semantically-equivalent one that increases the program's performance for the target architecture. Alternative representations of an IR, like the Program Dependence Graph (PDG), aid this process by… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.00986v1-abstract-full').style.display = 'inline'; document.getElementById('2402.00986v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2402.00986v1-abstract-full" style="display: none;"> A compiler's intermediate representation (IR) defines a program's execution plan by encoding its instructions and their relative order. Compiler optimizations aim to replace a given execution plan with a semantically-equivalent one that increases the program's performance for the target architecture. Alternative representations of an IR, like the Program Dependence Graph (PDG), aid this process by capturing the minimum set of constraints that semantically-equivalent execution plans must satisfy. Parallel programming like OpenMP extends a sequential execution plan by adding the possibility of running instructions in parallel, creating a parallel execution plan. Recently introduced parallel IRs, like TAPIR, explicitly encode a parallel execution plan. These new IRs finally make it possible for compilers to change the parallel execution plan expressed by programmers to better fit the target parallel architecture. Unfortunately, parallel IRs do not help compilers in identifying the set of parallel execution plans that preserve the original semantics. In other words, we are still lacking an alternative representation of parallel IRs to capture the minimum set of constraints that parallel execution plans must satisfy to be semantically-equivalent. Unfortunately, the PDG is not an ideal candidate for this task as it was designed for sequential code. We propose the Parallel Semantics Program Dependence Graph (PS-PDG) to precisely capture the salient program constraints that all semantically-equivalent parallel execution plans must satisfy. This paper defines the PS-PDG, justifies the necessity of each extension to the PDG, and demonstrates the increased optimization power of the PS-PDG over an existing PDG-based automatic-parallelizing compiler. Compilers can now rely on the PS-PDG to select different parallel execution plans while maintaining the same original semantics. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.00986v1-abstract-full').style.display = 'none'; document.getElementById('2402.00986v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 February, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2024. </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a href="https://github.com/arXiv/arxiv-search/releases">Search v0.5.6 released 2020-02-24</a>  </span> </div> </div> </main> <footer> <div class="columns is-desktop" role="navigation" aria-label="Secondary">  <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a 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