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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [SystemZ + SubregLiveness] Assertion `!NodePtr->isKnownSentinel()' failed."
href="https://bugs.llvm.org/show_bug.cgi?id=39276">39276</a>
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<th>Summary</th>
<td>[SystemZ + SubregLiveness] Assertion `!NodePtr->isKnownSentinel()' failed.
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Register Allocator
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>paulsson@linux.vnet.ibm.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=21000" name="attach_21000" title="reduced testcase">attachment 21000</a> <a href="attachment.cgi?id=21000&action=edit" title="reduced testcase">[details]</a></span>
reduced testcase
llc -mtriple=s390x-linux-gnu -mcpu=z13 ./tc-subregliven-coal.ll
-systemz-subreg-liveness -disable-machine-dce
clang-8: /home/ijonpan/llvm/llvm-dev/include/llvm/ADT/ilist_iterator.h:140:
Assertion `!NodePtr->isKnownSentinel()' failed.
#8 0x000002aa30e16ed0 llvm::SystemZRegisterInfo::shouldCoalesce
#9 0x000002aa3119dd8c (anonymous namespace)::RegisterCoalescer::joinCopy</pre>
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