<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/87777>87777</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            investigate how to use `llvm.is.fpclass` and replace `int_dx_isinf` with it
        </td>
    </tr>

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

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

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

<pre>
     HLSL Intrinsic | DXIL Op                   | LLVM Intrinsic |
|----------------|---------------------------|---------------------------|
| [isinf]        | [IsInf][dx.IsInf]         | [llvm.is.fpclass] |

_Originally posted by @bogner in https://github.com/llvm/llvm-project/issues/87367#issuecomment-2038833117_

Justin's lowering table shows we don't need our own intrinsic here
            
</pre>
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