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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 - Missing optimization: if constexpr(false) prevents NRVO"
href="https://bugs.llvm.org/show_bug.cgi?id=50953">50953</a>
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<th>Summary</th>
<td>Missing optimization: if constexpr(false) prevents NRVO
</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
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<th>Component</th>
<td>Frontend
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>antoshkka@gmail.com
</td>
</tr>
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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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<p>
<div>
<pre>Consider the following code:
struct A {
A() = default;
A(A&&);
};
template <bool B>
A foo() {
A a;
if constexpr (B) {
return A();
}
return a;
}
A test() {
return foo<false>();
}
In the above example NRVO for `a` is applied by many compilers, but not clang.
Godbolt playground: <a href="https://godbolt.org/z/P8G3zj5GE">https://godbolt.org/z/P8G3zj5GE</a></pre>
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