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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 --- - Missing optimization: linkonce_odr stuff only referenced by available externally globals is not discarded"
href="http://llvm.org/bugs/show_bug.cgi?id=20182">20182</a>
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<th>Summary</th>
<td>Missing optimization: linkonce_odr stuff only referenced by available externally globals is not discarded
</td>
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<th>Product</th>
<td>libraries
</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>Windows NT
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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
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<th>Component</th>
<td>Common Code Generator Code
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>rnk@google.com
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<th>CC</th>
<td>david.majnemer@gmail.com, llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>consider:
@x = available_externally constant void()* @f
define linkonce_odr void @f() {
ret void
}
define i32 @main() {
%f = load void()** @x
call void %f()
ret i32 0
}
@x references @f. @x will not be emitted, and @f is discardable, so we should
discard it if that's the only reference.
This is relevant for dllimported vftable thunks in the MS ABI, because they are
not actually available externally. We emit them for devirtualization of
thunks, but we cannot actually import them.</pre>
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