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    <head>
      <base href="http://bugs.llvm.org/">
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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <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>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Improve generic vector CTPOP expansion
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>libraries
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>trunk
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>enhancement
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>Common Code Generator Code
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>bruno.cardoso@gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org
          </td>
        </tr></table>
      <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>
        </div>
      </p>


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