<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/121241>121241</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [aarch64] Is a bug for selecting register?
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

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

    <tr>
      <th>Reporter</th>
      <td>
          Zhenhang1213
      </td>
    </tr>
</table>

<pre>
    demo:
https://godbolt.org/z/E5zqec1xj

I think this is wrong, Instead of w8, x8 should be selected, like gcc. And I find this ir is right


</pre>
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