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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 - Merge clang r322246 into 6.0 branch: [X86] Fix vpshrd builtins to require an ICE for their constant argument to match vpshld."
   href="https://bugs.llvm.org/show_bug.cgi?id=35915">35915</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Merge clang r322246 into 6.0 branch: [X86] Fix vpshrd builtins to require an ICE for their constant argument to match vpshld.
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>libraries
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>6.0
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Windows NT
          </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>craig.topper@gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>This commit makes the frontend generate an error for this code because the last
argument should be an integer constant expression

__m512i test_mm512_mask_shrdi_epi64(__m512i __S, __mmask8 __U, __m512i __A,
__m512i __B, unsigned x) {
  return _mm512_mask_shrdi_epi64(__S, __U, __A, __B, x);
}


Without this check in the frontend it goes to the backend and throws a fatal
error in the backend during isel. The frontend error is a better user
experience.

The _mm512_mask_shrdi_epi64 was introduced in late December 2017 so doesn't
exist in any releases before 6.0</pre>
        </div>
      </p>


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