<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/92422>92422</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [DirectX] scalarize vector types
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            backend:DirectX
      </td>
    </tr>

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

    <tr>
      <th>Reporter</th>
      <td>
          python3kgae
      </td>
    </tr>
</table>

<pre>
    
DXIL requires [Vectors](https://github.com/microsoft/DirectXShaderCompiler/blob/main/docs/DXIL.rst#vectors) to be scalarized.

AC:
- [ ] design doc for scalarize vector types.
       Note that group-shared vectors need to be lowered to arrays to maintain layout consistency and avoid affecting access coalescing.
- [ ] Verify that the vector overload of intrinsic functions is functioning correctly.
- [ ] Introduce the ScalarizerPass to the DirectX backend pipeline.
       Keep in mind that the ScalarizerPass does not have a wrapper for the legacy pass manager.
- [ ] Add a pass to scalarize global variables, including static globals and group-shared variables.
- [ ] Tests
</pre>
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