<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/73180>73180</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            flang-new driver does not enable some LLVM optimizations
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            enhancement,
            performance
      </td>
    </tr>

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

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

<pre>
    LLVM [PassBuilder](https://llvm.org/doxygen/classllvm_1_1PassBuilder.html) relies on `PipelineTuningOptions` to enable some LLVM optimizations.  For example, `clang` [enables](https://github.com/llvm/llvm-project/blob/a8450619358c3de23b72aef7c1fd932bca112257/clang/lib/CodeGen/BackendUtil.cpp#L808) SLP vectorization at higher optimization levels. `flang-new` [does not](https://github.com/llvm/llvm-project/blob/a8450619358c3de23b72aef7c1fd932bca112257/flang/lib/Frontend/FrontendActions.cpp#L970) do this.

I think we need to align the optimization pipelines between `clang` and `flang-new`.
</pre>
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