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    <head>
      <base href="http://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_ASSIGNED "
   title="ASSIGNED --- - Create subregister liveness tracking tests later"
   href="http://llvm.org/bugs/show_bug.cgi?id=22007">22007</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Create subregister liveness tracking tests later
          </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>ASSIGNED
          </td>
        </tr>

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

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

        <tr>
          <th>Component</th>
          <td>Register Allocator
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>matze@braunis.de
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>matze@braunis.de
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvmbugs@cs.uiuc.edu
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Subregister liveness tracking is currently disabled in trunk while it is
developed. That means we cannot sensibly commit testcases for bugs we fix there
right now. This PR serves as a reminder to create test cases once we enable
subregister liveness for some targets.

- Kill flags are invalid for partially undefined uses. Fixed in r224664
- RegisterCoalescer failed to properly detect undef copies if only the
respective subranges were dead at the copy (but the main range alive). Fixed in
r224560
- LiveIntervalAnalysis::computeDeadValues() did not actually attach dead flags
to many values anymore. Fixed in r224538
- RegisterCoalescer::stripCopies() didn't pickup copies if they involved
subranges through multiple stages of indirection. Fixed in r224461</pre>
        </div>
      </p>
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