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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - DAG combiner asserts due to extend in-register size mismatch for shufflevector"
href="https://bugs.llvm.org/show_bug.cgi?id=33743">33743</a>
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<th>Summary</th>
<td>DAG combiner asserts due to extend in-register size mismatch for shufflevector
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<th>Product</th>
<td>libraries
</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>All
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Common Code Generator Code
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>david.stuttard@amd.com
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</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<pre>Created <span class=""><a href="attachment.cgi?id=18775" name="attach_18775" title="Reproducer for shufflevec issue in DAGCombine">attachment 18775</a> <a href="attachment.cgi?id=18775&action=edit" title="Reproducer for shufflevec issue in DAGCombine">[details]</a></span>
Reproducer for shufflevec issue in DAGCombine
This issue has been seen when compiling for the AMDGPU backend
llc -march=amdgcn shufflevec-dagcombine-issue.ll
This results in the following assert:
Assertion failed: VT.getSizeInBits() == Op.getValueSizeInBits() && "The sizes
of the input and result must match in order to perform the " "extend
in-register.", file ~\llvm\lib\CodeGen\SelectionDAG\SelectionDAG.cpp, line 1012
This looks like an issue in combineShuffleToVectorExtend</pre>
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