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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - `upgradeCUVariable` is non linear"
href="https://bugs.llvm.org/show_bug.cgi?id=33054">33054</a>
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<th>Summary</th>
<td>`upgradeCUVariable` is non linear
</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
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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>DebugInfo
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>davide@freebsd.org
</td>
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<th>CC</th>
<td>aprantl@apple.com, filcab@gmail.com, llvm-bugs@lists.llvm.org, llvm-dev@redking.me.uk, simon.f.whittaker@gmail.com
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<div>
<pre>I have in my hands a modestly sized piece of bitcode [250MB] produced with 3.8
(dumped after the mover merged input modules at LTO time) that takes circa
1000secs to be parsed. The overall time spent in the optimizer is about 1/10th
of that (120secs).
The profiler shows all the time goes in `parseMetadata` while materializing, in
particular in `upgradeCUVariables` on metadata operations.
- 94.82% llvm::MetadataLoader::MetadataLoaderImpl::upgradeCUVariables
- 42.72% llvm::GlobalObject::getMetadata
- 21.45% llvm::MDGlobalAttachmentMap::get
[...]
+ 29.10% llvm::GlobalObject::addMetadata
+ 11.56% llvm::GlobalObject::eraseMetadata
[...]
I'm afraid I'm not in a position to share the bitcode as it's owned by one of
our internal game teams, but I may try to reproduce on something publicly
available.
Adrian, you committed this code, any ideas on how we can make it more
efficient?</pre>
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