<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/115392>115392</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Missing function pointer (e.g. `void (ptr)`) support in `mlir::LLVM::GlobalOp`
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            mlir:llvm
      </td>
    </tr>

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

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

<pre>
    While working on ClangIR to LLVM lowering, we want to generate this kind of LLVM IR code:
```
@_ZN1BD1Ev = dso_local unnamed_addr alias void (ptr), ptr @_ZN1BD2Ev
@_ZN1CD2Ev = dso_local unnamed_addr alias void (ptr), ptr @_ZN1BD2Ev
@_ZN1CD1Ev = dso_local unnamed_addr alias void (ptr), ptr @_ZN1BD2Ev
 
define dso_local void @_ZN1BD2Ev(ptr noundef nonnull align 8 dereferenceable(9) %this) unnamed_addr #0 {
```

However,  one of the issues is that `llvm.mlir.global`s don't seem to accept anything besides `!llvm.ptr` as their types and there are no existing casts to use in its initializers that can allows us to load `llvm.mlir.addressof` as `void (ptr)`. I tried several combinations but didn't get successful, let me know if I'm missing anything. The other reason we can't generate this is the missing `alias`, tracked in https://github.com/llvm/llvm-project/issues/115390


</pre>
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