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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - NewGVN miscompile and crash"
href="https://bugs.llvm.org/show_bug.cgi?id=49873">49873</a>
</td>
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<th>Summary</th>
<td>NewGVN miscompile and crash
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
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<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>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Scalar Optimizations
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>ruiling.song83@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=24727" name="attach_24727" title="IR reproducer">attachment 24727</a> <a href="attachment.cgi?id=24727&action=edit" title="IR reproducer">[details]</a></span>
IR reproducer
NewGVN fails to add extra dependency when processing an icmp with one operand
being phi-node. it tries to evaluate a phi-of-icmp and later one of the icmp
proved to be constant based on a previous predicate, see the code after big
piece of comment in NewGVN::performSymbolicCmpEvaluation(). We need to make
sure the dependency between the real instruction and the predicate condition
was added.
opt -S -newgvn -o - reproduce.ll</pre>
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