<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/63308>63308</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            clang-tidy misc-const-correctness has performance issues with std::format
        </td>
    </tr>

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

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

    <tr>
      <th>Reporter</th>
      <td>
          cedric-ca
      </td>
    </tr>
</table>

<pre>
    Hi,

We encounter performance issues with clang-tidy misc-const-correctness when we introduced std::format.
I tried LLVM 16.0.0, 16.0.3 and 16.0.6.

The file I tested has only one std::format:
const double toto = 1.0;
std::string s = std::format("text I want = {}", toto);
vs 
std::string s = "text I want = " + std::to_string(toto);

[std_format_performance.txt](https://github.com/llvm/llvm-project/files/11747920/std_format_performance.txt)
[without_std_format_performance.txt](https://github.com/llvm/llvm-project/files/11747921/without_std_format_performance.txt)

Cédric
</pre>
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