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      <base href="https://llvm.org/bugs/" />
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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 --- - LICM spends large part of its time computing Alias info"
   href="https://llvm.org/bugs/show_bug.cgi?id=31883">31883</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>LICM spends large part of its time computing Alias info
          </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>Windows NT
          </td>
        </tr>

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

        <tr>
          <th>Keywords</th>
          <td>slow-compile
          </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>davide@freebsd.org
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>dberlin@dberlin.org, llvm-bugs@lists.llvm.org, simon.f.whittaker@gmail.com
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=17942" name="attach_17942" title="LTO profile">attachment 17942</a> <a href="attachment.cgi?id=17942&action=edit" title="LTO profile">[details]</a></span>
LTO profile

LICM seems to spend 90-95% of its time in AST, which is terribly O(N^2).
This slowness is exacerbated on large files or at LTO time.
See attachment.</pre>
        </div>
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