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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - opt -jump-threading hangs"
href="https://bugs.llvm.org/show_bug.cgi?id=48362">48362</a>
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<th>Summary</th>
<td>opt -jump-threading hangs
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
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<th>Version</th>
<td>unspecified
</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>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>new bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>mikael.holmen@ericsson.com
</td>
</tr>
<tr>
<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=24227" name="attach_24227" title="bbi-50589_reduced.ll reproducer">attachment 24227</a> <a href="attachment.cgi?id=24227&action=edit" title="bbi-50589_reduced.ll reproducer">[details]</a></span>
bbi-50589_reduced.ll reproducer
Reproduce with:
opt -o - bbi-50589_reduced.ll -S -jump-threading
It doesn't seem to terminate.
This starts happening after 5486e00dc3e3:
[InstSimplify] remove poison-unsafe insertelement of undef value
PR45481:
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - Can't remove insertelement undef"
href="show_bug.cgi?id=45481">https://bugs.llvm.org/show_bug.cgi?id=45481</a>
SDAG has an identical transform to this, so there's little
chance of any real-world impact. OTOH, that means we are
effectively sweeping the bug out of sight because poison
exists in codegen too.</pre>
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