<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/90418>90418</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [mlir][Vector] Add support for `i2` vector emulation
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            mlir,
            mlir:vector
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
            KoolJBlack,
            banach-space
      </td>
    </tr>

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

<pre>
    [We recently added support](https://github.com/llvm/llvm-project/blob/aa596fa4d974f75ed8d2db3f4880ec0e5be3e176/mlir/lib/Dialect/Vector/Transforms/VectorEmulateNarrowType.cpp#L857) to generate fast vector sequences of instructions to "emulate" conversions from `i4` to byte+ integer and 32-bit floating point types. This issue is to track the same work for `i2` data types. We should add support for signed and unsigned extensions to byte and floating point types. The existing `i4` support should be the foundation of the implementation for `i2` (we may need to loop into that code for the `i2` case, literally). The tests added in the `i4` support can help define the cases that need to be supported for `i2`.
</pre>
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