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<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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