<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/156346>156346</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [Headers][X86] Allow vector zero padding intrinsics to be used in constexpr
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            good first issue,
            backend:X86,
            clang:headers,
            constexpr
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          RKSimon
      </td>
    </tr>
</table>

<pre>
    ```
_mm256_zextpd128_pd256
_mm512_zextpd128_pd512
_mm512_zextpd256_pd512
_mm256_zextph128_ph256
_mm512_zextph128_ph512
_mm512_zextph256_ph512
_mm256_zextps128_ps256
_mm512_zextps128_ps512
_mm512_zextps256_ps512
_mm256_zextsi128_si256
_mm512_zextsi128_si512
_mm512_zextsi256_si512
```
</pre>
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