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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - SystemZ backend: failing assert in ScheduleDAGRRList"
href="https://llvm.org/bugs/show_bug.cgi?id=28753">28753</a>
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<tr>
<th>Summary</th>
<td>SystemZ backend: failing assert in ScheduleDAGRRList
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>colpell@ca.ibm.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=16831" name="attach_16831" title="C source">attachment 16831</a> <a href="attachment.cgi?id=16831&action=edit" title="C source">[details]</a></span>
C source
To reproduce, compile bug.c with
clang -O1 -target s390x-linux-gnu -c bug.c
Compilation aborts during "DAG->DAG Pattern Instruction Selection" with this
failed assert:
llvm/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp:1197: llvm::MVT
getPhysicalRegisterVT(llvm::SDNode*, unsigned int, const
llvm::TargetInstrInfo*): Assertion `MCID.ImplicitDefs && "Physical reg def must
be in implicit def list!"' failed.
Compiling at -O0 does not reproduce the failure. Changing "shift" in bug.c to a
value lower than 64 also causes compilation to pass.
LLVM/Clang is from SVN trunk 276984.</pre>
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