<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/54584>54584</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            clang timeout on certain floating-point constants
        </td>
    </tr>

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

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

    <tr>
      <th>Reporter</th>
      <td>
          Edin-Li
      </td>
    </tr>
</table>

<pre>
    Affected versions: x86-64 clang 13.0.1 (Ubuntu 20.04.2), also reproduced with clang 10

(terminal) $ clang a.c

Looks like this is a magical constant (from test suite). Clang does not terminate even after hours, while gcc compiles quickly. A tiny change to the constant will yield a fast compilation (<1s):

Line 201:
-2277811246822238899767398834228515625e-4951L;
+2277811246822238899767398834228515626e-4951L;

see code at: https://godbolt.org/z/nnx56esqK

</pre>
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