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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Assert in LegacyPassManager when adding PostDominatorTree to analysis pass"
href="https://llvm.org/bugs/show_bug.cgi?id=30370">30370</a>
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<th>Summary</th>
<td>Assert in LegacyPassManager when adding PostDominatorTree to analysis pass
</td>
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<th>Product</th>
<td>new-bugs
</td>
</tr>
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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>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>new bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>Christof.Douma@arm.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=17255" name="attach_17255" title="reproducer - created against svn revision 281213.">attachment 17255</a> <a href="attachment.cgi?id=17255&action=edit" title="reproducer - created against svn revision 281213.">[details]</a></span>
reproducer - created against svn revision 281213.
When I add PostDominatorTree analysis pass to scalar-evolution (as a transitive
requirement) the LegacyPassManager run into an assert:
opt: ../lib/IR/LegacyPassManager.cpp:520: void
llvm::PMTopLevelManager::setLastUser(llvm::ArrayRef<llvm::Pass*>, llvm::Pass*):
Assertion `AnalysisPass && "Expected analysis pass to exist."' failed.
This looks like a bad interaction between the new PassManager and the
LegacyPassManager.
To reproduce, use the attached patch on ScalarEvolution.cpp that only adds
PostDominatorTree as a required pass and run using:
true | opt -loop-idiom -loop-unroll
This currently blocks my attempt to solve <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Scalar Evolution fails to find constant trip count"
href="show_bug.cgi?id=28429">bug 28429</a>.</pre>
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