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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 - Assertion `(Ops[0].getValueType().getVectorElementCount() * Ops.size()) == VT.getVectorElementCount() & & "Incorrect element count in vector concatenation!"' failed"
   href="https://bugs.llvm.org/show_bug.cgi?id=46820">46820</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Assertion `(Ops[0].getValueType().getVectorElementCount() * Ops.size()) == VT.getVectorElementCount() & & "Incorrect element count in vector concatenation!"' 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>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: X86
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>benny.kra@gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>craig.topper@gmail.com, llvm-bugs@lists.llvm.org, llvm-dev@redking.me.uk, spatel+llvm@rotateright.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=23767" name="attach_23767" title="reduced test case">attachment 23767</a> <a href="attachment.cgi?id=23767&action=edit" title="reduced test case">[details]</a></span>
reduced test case

Seems to be an AVX512 issue

$ llc < bugpoint-reduced-simplified.ll
llc: llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp:4340: llvm::SDValue
foldCONCAT_VECTORS(const llvm::SDLoc &, llv
m::EVT, ArrayRef<llvm::SDValue>, llvm::SelectionDAG &): Assertion
`(Ops[0].getValueType().getVectorElementCount() * Ops.size()) ==
VT.getVectorElementCount() &
& "Incorrect element count in vector concatenation!"' failed.</pre>
        </div>
      </p>


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