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        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Compiling time deg caused by ebf3b18 - [Scheduling] Implement a new way to cluster loads/stores"
   href="https://bugs.llvm.org/show_bug.cgi?id=47966">47966</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Compiling time deg caused by ebf3b18 - [Scheduling] Implement a new way to cluster loads/stores
          </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>Backend: AArch64
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>qshanz@cn.ibm.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>arnaud.degrandmaison@arm.com, llvm-bugs@lists.llvm.org, smithp352@googlemail.com, Ties.Stuij@arm.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=24098" name="attach_24098" title="AArch64 tests">attachment 24098</a> <a href="attachment.cgi?id=24098&action=edit" title="AArch64 tests">[details]</a></span>
AArch64 tests

>From Owen:
<span class="quote">> I’m seeing significant compile time problems introduced by this change on AArch64, with a worst case example taking >10 minutes to compile.  The root cause seems to be the IsReachable() calls introduced here - they’re not cheap, and they’re being called a lot.  Is there some way we can back off or limit the number of queries here?</span ></pre>
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