<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/114528>114528</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [mlir][affine] Affine super vectorize should guard against empty virtual-vector-size option
        </td>
    </tr>

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

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

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

<pre>
    When calling `mlir-opt --affine-super-vectorize`, nothing happens, because the default for `virtual-vector-size` is empty, and all current vectorization patterns require vector rank 1, 2 or 3 (whereas empty vector sizes means rank 0). When calling additionally with option `vectorize-reductions`, then an error is printed (`Vectorizing reductions is supported only for 1-D vectors.`), because then the vector rank must be 1.

I think the pass should check if the rank is zero and fail, informing the user that the virtual-vector-size option must be specified. 

Optionally, we could add a default for the option, eg 8.
</pre>
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