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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Exhaustive stack usage"
href="https://bugs.llvm.org/show_bug.cgi?id=44253">44253</a>
</td>
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<th>Summary</th>
<td>Exhaustive stack usage
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>LLVM Codegen
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>antoshkka@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
</td>
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<p>
<div>
<pre>Consider the following example:
struct test {
test(test&&);
void Extend(test v);
int data_[4096];
};
test test_func(test t) {
t.Extend(static_cast<test&&>(t));
t.Extend(static_cast<test&&>(t));
return t;
}
With `-std=c++11 -O2` flags Clang uses 32768 bytes of stack, GCC uses 16392
bytes.
Note that adding additional `t.Extend(static_cast<test&&>(t));` results in
stack usage growth for Clang, while GCC keeps using only 16392 bytes.
Godbolt playground: <a href="https://godbolt.org/z/MdaNfa">https://godbolt.org/z/MdaNfa</a></pre>
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</p>
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