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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - testcase we fail to devirtualize but gcc does"
href="http://llvm.org/bugs/show_bug.cgi?id=18972">18972</a>
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<th>Summary</th>
<td>testcase we fail to devirtualize but gcc does
</td>
</tr>
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<th>Product</th>
<td>new-bugs
</td>
</tr>
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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>Linux
</td>
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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>new bugs
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>rafael.espindola@gmail.com
</td>
</tr>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>Given
struct foo {
virtual ~foo();
};
struct bar : public foo {
virtual void zed();
};
void f() {
foo *x(new bar);
delete x;
}
clang at -O3 will produce a call via a vtable. It would be illegal to call
_ZN3barD0Ev, since we are not guaranteed by the ABI that it is available, but
what current gcc does instead is call _ZN3fooD2E.
To do this in llvm we would probably need one more linkage:
unavailable_but_known. The idea is that _ZN3barD0Ev is not
available_externally, it can be internal no another TU, but we know its value
anyway.</pre>
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