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    <head>
      <base href="https://bugs.llvm.org/">
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Big shuffle crashes X86 backend"
   href="https://bugs.llvm.org/show_bug.cgi?id=47534">47534</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Big shuffle crashes X86 backend
          </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=23964" name="attach_23964" title="reduced test case">attachment 23964</a> <a href="attachment.cgi?id=23964&action=edit" title="reduced test case">[details]</a></span>
reduced test case

$ llc < bugpoint-reduced-simplified.ll -mcpu=skylake-avx512
llc: llvm/lib/Target/X86/X86ISelLowering.cpp:10987: unsigned int
getV4X86ShuffleImm(ArrayRef<int>): Assertion `Mask[1] >= -1 && Mask[1] < 4 &&
"Out of bound mask element!"' failed.</pre>
        </div>
      </p>


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