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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - wasm: Implement comdat noduplicates"
href="https://bugs.llvm.org/show_bug.cgi?id=50531">50531</a>
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<th>Summary</th>
<td>wasm: Implement comdat noduplicates
</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>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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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>Backend: WebAssembly
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>i@maskray.me
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Regular `comdat any` performs deduplication with the symbol name as the key.
`comdat noduplicates` is useful to express that a group of sections should be
retained or discarded as a unit. This is currently unimplemented for wasm.
This feature is useful for certain metadata sections. In the simplest
non-value-profiling PGO/coverage case. A function needs two metadata sections:
__llvm_prf_cnts, __llvm_prf_data. The code references __llvm_prf_cnts but
__llvm_prf_data is unreferenced. We can place the pair of cnts/data in a
`comdat noduplicates` to let the liveness of cnts retain data.</pre>
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