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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - UBSan (enum) failure on <regex> implementation of MSVC"
href="https://bugs.llvm.org/show_bug.cgi?id=42796">42796</a>
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<th>Summary</th>
<td>UBSan (enum) failure on <regex> implementation of MSVC
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>-New Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>jvapen@gmail.com
</td>
</tr>
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>The following case is reduced from the std::regex_search() of MSVC2017.
Compiler explorer: <a href="https://godbolt.org/z/OZKIJV">https://godbolt.org/z/OZKIJV</a>
// clang++ -std=c++2a -fsanitize=enum
enum E
{
A = 1,
B = 2,
C = 4,
};
constexpr E operator&(E _Left, E _Right) noexcept
{
return (static_cast<E>(static_cast<int>(_Left) &
static_cast<int>(_Right)));
}
constexpr E operator~(E _Left) noexcept
{
return (static_cast<E>(~static_cast<int>(_Left)));
}
int main()
{
E e = E::A;
e = (e & ~E::C);
}
<span class="quote">>> example.cpp:10:68: runtime error: load of value 4294967291, which is not a valid value for type 'E'</span ></pre>
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