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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [Polly] Make reduction dependency computation work on schedule trees"
href="https://llvm.org/bugs/show_bug.cgi?id=26320">26320</a>
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<th>Summary</th>
<td>[Polly] Make reduction dependency computation work on schedule trees
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<th>Product</th>
<td>Polly
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Linux
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Optimizer
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<th>Assignee</th>
<td>polly-dev@googlegroups.com
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<th>Reporter</th>
<td>tobias@grosser.es
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>When introducing reductions into Polly we thought it would be a good idea to
model reduction dependences using a "convex_hull" computation. However, this is
both computationally a lot more complex than expected and also conflicts made
it hard to compute reduction dependences on schedule trees. Fortunately, Sven
Verdoolaege suggested (at least parts) of what looks like a good solution.
Instead of first computing precise dependences and _then_ reintroducing
reduction dependences, we could just model reduction statements as may-writes
which will make the dependence analysis automatically introduce the additional
dependences needed when removing the inter-reduction-operation dependences.
This blocks <a href="http://reviews.llvm.org/D5190">http://reviews.llvm.org/D5190</a>
This is just a brief reminder. Please ping back in case you need more
information.</pre>
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