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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [InstCombine] Infinite loop in a bitcode generated by rustc"
href="https://bugs.llvm.org/show_bug.cgi?id=44245">44245</a>
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<th>Summary</th>
<td>[InstCombine] Infinite loop in a bitcode generated by rustc
</td>
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<th>Product</th>
<td>new-bugs
</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
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>release blocker
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>new bugs
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>phosek@chromium.org
</td>
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=22917" name="attach_22917" title="bitcode reproducer (reduced with bugpoint)">attachment 22917</a> <a href="attachment.cgi?id=22917&action=edit" title="bitcode reproducer (reduced with bugpoint)">[details]</a></span>
bitcode reproducer (reduced with bugpoint)
We're seeing what appears to be an infinite loop when running instcombine on a
bitcode file generated by rustc (the related Rust issue is
<a href="https://github.com/rust-lang/rust/issues/66036">https://github.com/rust-lang/rust/issues/66036</a>).
We've managed to create a reproducer and then further reduce it by using
bugpoint. This behavior can be reproduced by simply running:
opt -instcombine bugpoint-reduced-simplified.bc -o out
We've tried all the version from trunk to 6.0 and it reproduces with all of
them so this doesn't appear to be a recent regression.</pre>
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