<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/129249>129249</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Poor scalability of empty block elimination in SimplifyCFG
        </td>
    </tr>

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

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

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

<pre>
    ```c
int f(int);

#define T if (f(++i)) { return i; }

#define X16(X) X X X X X X X X X X X X X X X X

int g()
{
 int i = 0;
        X16(X16(X16(T)))
#ifdef TWICE
 X16(X16(X16(T)))
#endif
        return 0;
}
```
</pre>
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