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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Clang should warn when one condition trivially subsumes another condition"
href="https://llvm.org/bugs/show_bug.cgi?id=30897">30897</a>
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<th>Summary</th>
<td>Clang should warn when one condition trivially subsumes another condition
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</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>Frontend
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>chandlerc@gmail.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>Consider this test code:
bool f(int x) {
return x == 42 || x != 13;
}
bool g(int x) {
return x == 42 || x > 13;
}
Both of these contain trivially subsumed cases in an ||. I think Clang should
be able to at least warn on these in ||s and &&s when the expressions are
integral type comparisons that we can easily analyze.</pre>
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