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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - std::bitset::bitset(unsigned long long) does not zero unused bits"
href="https://bugs.llvm.org/show_bug.cgi?id=35438">35438</a>
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<th>Summary</th>
<td>std::bitset::bitset(unsigned long long) does not zero unused bits
</td>
</tr>
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<th>Product</th>
<td>libc++
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>All Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>tebbi@chromium.org
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
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<p>
<div>
<pre>As per the standard, the std::bitset<n>::bitset(unsigned long long x)
constructor should only take the lowest n bits from the argument, however, the
libc++ implementation stores the argument unchanged in its backing store, which
can be observed by the to_ulong() member function.
Example:
std::bitset<8> x(10000000);
printf("%zu\n", x.to_ulong());
This should output 255, but it outputs 10000000.
Also, this behavior is different from libstdc++, which is standard compliant in
this case.</pre>
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