<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/85107>85107</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [libc++] atomic_wait uses UL_COMPARE_AND_WAIT when it should use UL_COMPARE_AND_WAIT64 on Darwin
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            libc++
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
            ldionne,
            huixie90
      </td>
    </tr>

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

<pre>
    `UL_COMPARE_AND_WAIT` assumes a 32 bit value, but we're pointing to a `contention_t` which is a 64 bit value.
</pre>
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