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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Function merging not enabled at -O2/-Os or higher"
href="https://bugs.llvm.org/show_bug.cgi?id=44804">44804</a>
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<th>Summary</th>
<td>Function merging not enabled at -O2/-Os or higher
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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>All
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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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>mike.k@digitalcarbide.com
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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>
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<pre>In GCC, `-fipa-icf` is enabled at `-O2` (and higher) and `-Os`.
The equivalent functionality, for functions at least, is `-Xclang
-fmerge-functions`. It is not, however, enabled at any optimization level.
It should be changed to be enabled the same as it is in GCC - at `-O2` or
higher, `-Os`, and `-Oz`.
See: <a href="https://godbolt.org/z/2wLv_w">https://godbolt.org/z/2wLv_w</a> for an example of a lack of folding in Clang
as compared to GCC.</pre>
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