<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/110674>110674</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [flang][runtime] REDUCE likely uses wrong callback signatures for COMPLEX VALUE 
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            bug,
            flang:runtime
      </td>
    </tr>

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

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

<pre>
    I am removing fir.complex, and doing so, I realize that the REDUCE runtime implementation for COMPLEX is likely not correct for all targets since it uses std::complex values for the interface of the user defined function. The user function defined in Fortran is equivalent to C Complex.

This likely does not matter on aarch64 / x86-64, so I do not have a program demonstrating the issue functionally. On windows 32 bits, that would most likely cause issues.

https://github.com/llvm/llvm-project/blob/00ab44ee66dbcf0d32819dbc6e4eefd1b7c48dfa/flang/runtime/reduce.cpp#L528
</pre>
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