<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/133697>133697</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            __c11_atomic_add_fetch is not implemented
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
      </td>
    </tr>

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

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

<pre>
    Could you please implement the missing C11 variants of the atomic builtins?

I was using stdatomic.h in my code, sometimes directly with the  `__atomic_*` builtins, but got a quite confusing compilation error:

`address argument to atomic operation must be a pointer to integer, pointer or supported floating point type ('atomic_uint *' (aka '_Atomic(unsigned int) *') invalid`

After doing some search it turned out that instead of the `__atomic_*` builtins the `__c11_atomic_*` builtins shall be used. It fixed most of my issues except where a `__c11_*` variant is not available.

While those are not available, it it OK to make the compilation error go away by casting the atomic pointer to ordinary pointer?

`__atomic_add_fetch((unsigned int *)(ptr), val, memorder)`

</pre>
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