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      <base href="https://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 - [RegisterCoalescer] Assertion `ASubValNo != nullptr' failed."
   href="https://bugs.llvm.org/show_bug.cgi?id=40215">40215</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[RegisterCoalescer]  Assertion `ASubValNo != nullptr' failed.
          </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>Linux
          </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>Register Allocator
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>paulsson@linux.vnet.ibm.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org, quentin.colombet@gmail.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=21290" name="attach_21290" title="reduced test case">attachment 21290</a> <a href="attachment.cgi?id=21290&action=edit" title="reduced test case">[details]</a></span>
reduced test case

bin/llc -mcpu=z13 -O3 -systemz-subreg-liveness tc_asubvalno.ll

lib/CodeGen/RegisterCoalescer.cpp:908: std::pair<bool, bool>
{anonymous}::RegisterCoalescer::removeCopyByCommutingDef(const
llvm::CoalescerPair&, llvm::MachineInstr*): Assertion `ASubValNo != nullptr'
failed.</pre>
        </div>
      </p>


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