<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/64876>64876</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Assertion failed: (isRepresentableByInt64() && "Too many bits for int64_t"), function getExtValue, file APSInt.h, line 99.
        </td>
    </tr>

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

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

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

<pre>
    ```
% cat red.cpp 
#include <string>
int a { strncmp(0, 0, -511LL) }
```

```
 % xcrun ./clang red.cpp 
Assertion failed: (isRepresentableByInt64() && "Too many bits for int64_t"), function getExtValue, file APSInt.h, line 99.
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script.
```
</pre>
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