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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - A bug in DAG Combiner when turns a shuffle with undef mask of two CONCAT_VECTORS into a single concat"
href="http://llvm.org/bugs/show_bug.cgi?id=15950">15950</a>
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<th>Summary</th>
<td>A bug in DAG Combiner when turns a shuffle with undef mask of two CONCAT_VECTORS into a single concat
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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
</td>
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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
</td>
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<th>Component</th>
<td>new bugs
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>hao.liu8822@gmail.com
</td>
</tr>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=10488" name="attach_10488" title="bug.ll Overflow caused by undef mask">attachment 10488</a> <a href="attachment.cgi?id=10488&action=edit" title="bug.ll Overflow caused by undef mask">[details]</a></span>
bug.ll Overflow caused by undef mask
In DAG Combiner, an undef mask in ShuffleVector causes an overflow of an
unsigned variable. The overflowed variable will cause the assertion failure.
To reproduce the failure: llc bug.ll</pre>
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