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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Improve generic vector CTPOP expansion"
href="http://bugs.llvm.org/show_bug.cgi?id=32655">32655</a>
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<th>Summary</th>
<td>Improve generic vector CTPOP expansion
</td>
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<th>Product</th>
<td>libraries
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Common Code Generator Code
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>bruno.cardoso@gmail.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>Target independent vector CTPOP expansion could be improved by using a parallel
version of the algorithm presented in
<a href="http://graphics.stanford.edu/~seander/bithacks.html#CountBitsSetParallel">http://graphics.stanford.edu/~seander/bithacks.html#CountBitsSetParallel</a>
There's an old patch that does most part of the work in this direction:
<a href="https://reviews.llvm.org/D10002">https://reviews.llvm.org/D10002</a></pre>
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