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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Infinite loop in MemorySSAUpdater::applyInsertUpdates during loop-rotate"
href="https://bugs.llvm.org/show_bug.cgi?id=43493">43493</a>
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<th>Summary</th>
<td>Infinite loop in MemorySSAUpdater::applyInsertUpdates during loop-rotate
</td>
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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>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Scalar Optimizations
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>bjorn.a.pettersson@ericsson.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<pre>Created <span class=""><a href="attachment.cgi?id=22598" name="attach_22598" title="reduced reproducer">attachment 22598</a> <a href="attachment.cgi?id=22598&action=edit" title="reduced reproducer">[details]</a></span>
reduced reproducer
Looks like we get stuck in an infinite loop in
MemorySSAUpdater::applyInsertUpdates when running
opt -enable-mssa-loop-dependency=true -loop-rotate -S -o - mssa5.ll
Problem is not seen with -enable-mssa-loop-dependency=false.
Reproduced with trunk at llvm-svn: 373150
The attached mssa5.ll is a quite heavily reduced test case (still in loop
simplify form). Original C test case was generated by csmith.</pre>
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