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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Assertion `NewOuter->isRecursivelyLCSSAForm(*DT) && "LCSSA is broken after separating nested loops!"' failed."
href="https://llvm.org/bugs/show_bug.cgi?id=28825">28825</a>
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<th>Summary</th>
<td>Assertion `NewOuter->isRecursivelyLCSSAForm(*DT) && "LCSSA is broken after separating nested loops!"' failed.
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</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>Linux
</td>
</tr>
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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>Core LLVM classes
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>chisophugis@gmail.com
</td>
</tr>
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<th>CC</th>
<td>chandlerc@gmail.com, dberlin@dberlin.org, llvm-bugs@lists.llvm.org, michael.v.zolotukhin@gmail.com
</td>
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<th>Blocks</th>
<td>28315
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=16867" name="attach_16867" title="Failing test case.">attachment 16867</a> <a href="attachment.cgi?id=16867&action=edit" title="Failing test case.">[details]</a></span>
Failing test case.
opt: /home/sean/pg/llvm/lib/Transforms/Utils/LoopSimplify.cpp:383: llvm::Loop*
separateNestedLoop(llvm::Loop*, llvm::BasicBlock*, llvm::DominatorTree*,
llvm::LoopInfo*, llvm::ScalarEvolution*, bool, llvm::AssumptionCache*):
Assertion `NewOuter->isRecursivelyLCSSAForm(*DT) && "LCSSA is broken after
separating nested loops!"' failed.
For some reason this only manifests with the new PM.
opt -passes='function(lcssa,loop-simplify)' -disable-output $1
(
but this succeeds:
opt -lcssa -loop-simplify -disable-output $1
)
Sorry for the enormous testcase (attached). Even with the new hotness for CFG
reduction that DannyB added recently this is the best that bugpoint can do.</pre>
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