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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Abnormal amount of time spent in SelectionDAG::Combine"
href="https://bugs.llvm.org/show_bug.cgi?id=44128">44128</a>
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<th>Summary</th>
<td>Abnormal amount of time spent in SelectionDAG::Combine
</td>
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<th>Product</th>
<td>libraries
</td>
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<th>Version</th>
<td>9.0
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
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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>Backend: X86
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>jonasschievink@gmail.com
</td>
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<th>CC</th>
<td>craig.topper@gmail.com, llvm-bugs@lists.llvm.org, llvm-dev@redking.me.uk, spatel+llvm@rotateright.com
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<pre>Created <span class=""><a href="attachment.cgi?id=22860" name="attach_22860" title="Reproduction - run with `llc llvm.ll`">attachment 22860</a> <a href="attachment.cgi?id=22860&action=edit" title="Reproduction - run with `llc llvm.ll`">[details]</a></span>
Reproduction - run with `llc llvm.ll`
The attached LLVM IR (generated by rustc) makes llc spend an unexpectedly long
time (minutes) in SelectionDAG::Combine.
Upstream issue: <a href="https://github.com/rust-lang/rust/issues/66595">https://github.com/rust-lang/rust/issues/66595</a>
The IR isn't fully minimized yet, but the file is only a couple dozen lines
regardless.</pre>
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