<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/83177>83177</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [DirectX] DXContainer support for SM 6.8 feature flags
        </td>
    </tr>

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

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

    <tr>
      <th>Reporter</th>
      <td>
          llvm-beanz
      </td>
    </tr>
</table>

<pre>
    Shader Model 6.8 adds new feature flags that are exposed in the DX Container:

>From DXC:
```c
// SM 6.8+
const uint64_t ShaderFeatureInfo_SampleCmpGradientOrBias = 0x80000000;
const uint64_t ShaderFeatureInfo_ExtendedCommandInfo = 0x100000000;

// Experimental SM 6.9+ - Reserved, not yet supported.
// WaveMMA slots in between two SM 6.6 feature bits.
const uint64_t ShaderFeatureInfo_WaveMMA = 0x8000000;
```

The flags get exposed as constants here: https://github.com/llvm/llvm-project/blob/main/llvm/include/llvm/BinaryFormat/DXContainerConstants.def

We'll need YAML tests that support round tripping the flags in and out of DX Containers like the test here:

https://github.com/llvm/llvm-project/blob/main/llvm/test/tools/obj2yaml/DXContainer/ShaderFlags.yaml

</pre>
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