<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/57117>57117</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            clang-format 14 is extremely slow
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

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

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

<pre>
    Formatting https://github.com/OpenMPT/openmpt/blob/072d4ccc83d842cfa34601dddf2c69a4cc889c74/src/mpt/arch/x86_amd64.hpp (~50kB) using https://github.com/OpenMPT/openmpt/blob/072d4ccc83d842cfa34601dddf2c69a4cc889c74/src/mpt/.clang-format with clang-format 14 takes about 14 minutes for me (CPU is a 3.4GHz AMD Piledriver).
I am using `clang-format version 14.0.5` (as shipped with Visual Studio 2022 17.3.0) or `Ubuntu clang-format version 14.0.6-++20220622053131+f28c006a5895-1~exp1~20220622173215.157` (from `deb http://apt.llvm.org/focal/ llvm-toolchain-focal-14 main`).

I do not see any excessive memory consumption, it's only CPU time.

The performance was fine with clang-format 13.

I could also provide other source files where performance is noticeably slow with clang-format 14 if required, however the given file is the worst offender.

</pre>
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