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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 - ThinLTO doesn't apply interprocedural GlobalDCE optimization"
href="https://bugs.llvm.org/show_bug.cgi?id=33631">33631</a>
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<th>Summary</th>
<td>ThinLTO doesn't apply interprocedural GlobalDCE optimization
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<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>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Interprocedural Optimizations
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>charles.saternos@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>// a.c
int jj = 10;
int x() {
return jj;
}
int f(int x) {
return x + 1;
}
// b.c
extern int f(int);
int main(void) {
return 1;
}
///////////////////
# === THINLTO ===
$ ../build/bin/clang a.c b.c --for-linker=-mllvm --for-linker=-stats -flto=thin
\
-fuse-ld=lld -o out &>&1 | grep globaldce
# nothing
# === LTO ===
$ ../build/bin/clang a.c b.c --for-linker=-mllvm --for-linker=-stats -flto \
-fuse-ld=lld -o out &>&1 | grep globaldce
2 globaldce - Number of functions removed
1 globaldce - Number of global variables removed</pre>
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