<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/63216>63216</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            v_mad_u64_u32 patterns do not import in globalisel 
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            backend:AMDGPU,
            globalisel
      </td>
    </tr>

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

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

<pre>
    ```
Included from /home/matt/src/llvm-project/llvm/lib/Target/AMDGPU/AMDGPU.td:1908:
Included from /home/matt/src/llvm-project/llvm/lib/Target/AMDGPU/SIInstrInfo.td:2972:
Included from /home/matt/src/llvm-project/llvm/lib/Target/AMDGPU/SIInstructions.td:28:
Included from /home/matt/src/llvm-project/llvm/lib/Target/AMDGPU/VOPInstructions.td:1485:
/home/matt/src/llvm-project/llvm/lib/Target/AMDGPU/VOP3Instructions.td:661:3: warning: Skipped pattern: Could not infer class for EXTRACT_SUBREG operand #0
  def : GCNPat <
  ^
Included from /home/matt/src/llvm-project/llvm/lib/Target/AMDGPU/AMDGPU.td:1908:
Included from /home/matt/src/llvm-project/llvm/lib/Target/AMDGPU/SIInstrInfo.td:2972:
Included from /home/matt/src/llvm-project/llvm/lib/Target/AMDGPU/SIInstructions.td:28:
Included from /home/matt/src/llvm-project/llvm/lib/Target/AMDGPU/VOPInstructions.td:1485:
/home/matt/src/llvm-project/llvm/lib/Target/AMDGPU/VOP3Instructions.td:682:10: note: instantiated from multiclass
  defm : IMAD32_Pats<V_MAD_U64_U32_e64>;
         ^
```

I'm assuming GlobalISel emitter is getting confused by the 2 outputs on the v_mad_u64_u32, and the extract type should just infer it from the first result.

Additionally the combiner needs to implement the reassociation from f02510e432e2c452e85a2b7450a8588d0f3c526a
</pre>
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