<html>
    <head>
      <base href="https://llvm.org/bugs/" />
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - GVNHoist pass uses a large amount of memory and appears to hang due to large increase in buildtime"
   href="https://llvm.org/bugs/show_bug.cgi?id=28670">28670</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>GVNHoist pass uses a large amount of memory and appears to hang due to large increase in buildtime
          </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>normal
          </td>
        </tr>

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

        <tr>
          <th>Component</th>
          <td>Scalar Optimizations
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>alina.sbirlea@gmail.com
          </td>
        </tr>

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

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=16795" name="attach_16795" title="Sample testcase">attachment 16795</a> <a href="attachment.cgi?id=16795&action=edit" title="Sample testcase">[details]</a></span>
Sample testcase

The recently added GVNHoist pass causes certain Halide tests to take forever
making Halide unusable.

More details on discussion: <a href="https://reviews.llvm.org/D22639">https://reviews.llvm.org/D22639</a>

Adding a sample testcase generated by Halide. 
Test using "opt -gvn-hoist gvnhoist_small.bc".

An even larger testcase can be found here:
<a href="https://drive.google.com/open?id=0B01oOnN8VyO8MnpIdlpBcmRybmc">https://drive.google.com/open?id=0B01oOnN8VyO8MnpIdlpBcmRybmc</a></pre>
        </div>
      </p>
      <hr>
      <span>You are receiving this mail because:</span>
      
      <ul>
          <li>You are on the CC list for the bug.</li>
      </ul>
    </body>
</html>