<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/114275>114275</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [HLSL] DIspatchThreadID/GroupID and related semantic support
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            HLSL
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
            llvm-beanz
      </td>
    </tr>

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

<pre>
    Hi!

As I started to look into some thread/group related semantics, I noticed SV_DispatchThreadID has been implemented.

>From MSDN, semantic is a uint3, each element for 1 dimension.
However, the dx_thread_id intrinsic is implemented as `i32 dx_thread_id(i32)`, and it looks like this intrinsic is called 1 time for each dimension. Do you know why? Is that expected?

On the SPIR-V side, we gather all 3 dimensions at the same time, hence it would be convenient to have the following intrinsic prototype instead: `<3 x i32> thread_id()`.
On the DXIL side (generated by DXC), looks like there are no builtin call, the semantic is directly linked to an `<3 x i32>` input parameter with the semantic.


</pre>
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