Simple Amplification Shader internal compiler error repro (using 2021-12-08 dxc.exe release)

[DanHCM]

Hello. I've got a quite small reproduction of an "Internal compiler error: access violation ..." using the 2021-12-08 released dxc as follows -

dxc.exe test.hlsl -E main -T as_6_5 -Od

where 'test.hlsl' contains -

struct SharedPayload
{
  uint2 m_a;

  void Foo( in float3 v3 )
  {
    uint3 f16Vec3 = f32tof16(v3);
    m_a.x = f16Vec3.x | (f16Vec3.y<<16);
    m_a.y = f16Vec3.z;
  }
};

groupshared SharedPayload g_payload;

[numthreads(8, 8, 1)]
void main()
{
  g_payload.Foo( 1.0.xxx );
  DispatchMesh(1,1,1,g_payload);
}

I'm not claiming this is supposed to compile without errors but I would expect it to report a sensible error message rather than get a memory access violation.

Cheers

Dan