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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - -Wconversion warning not detecting potential overflow"
href="https://bugs.llvm.org/show_bug.cgi?id=44317">44317</a>
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<th>Summary</th>
<td>-Wconversion warning not detecting potential overflow
</td>
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<th>Product</th>
<td>clang
</td>
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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>Linux
</td>
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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
</td>
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<th>Component</th>
<td>Frontend
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>leonardchan@google.com
</td>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<pre>Given the following code:
```
typedef short unsigned int uint16_t;
uint16_t func(uint16_t x, uint16_t mask) {
x += ~mask;
return x;
}
```
GCC is able to emit a warning with `-Wconversion` on the `x += ~mask` which can
cause an unexpected overflow. We do not get any similar warning with
`-Wconversion` on clang though, which would be nice to have.</pre>
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