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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [SimpleLoopUnswitch] Assertion `OldContainingL->hasDedicatedExits() && "Unexpected predecessor of hoisted loop preheader!"' failed."
href="https://bugs.llvm.org/show_bug.cgi?id=38283">38283</a>
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<th>Summary</th>
<td>[SimpleLoopUnswitch] Assertion `OldContainingL->hasDedicatedExits() && "Unexpected predecessor of hoisted loop preheader!"' 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>
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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>Loop Optimizer
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>paulsson@linux.vnet.ibm.com
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</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
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<pre>Created <span class=""><a href="attachment.cgi?id=20593" name="attach_20593" title="reduced testcase">attachment 20593</a> <a href="attachment.cgi?id=20593&action=edit" title="reduced testcase">[details]</a></span>
reduced testcase
Getting dozens of test failures with -enable-simple-loop-unswitch currently.
Attached is a reduced test case for opt:
opt -mtriple=s390x-linux-gnu -O3 -mcpu=z13 -enable-simple-loop-unswitch
./tc_simpleloopunsw.ll
opt:
/home/ijonpan/llvm/llvm-dev/lib/Transforms/Scalar/SimpleLoopUnswitch.cpp:308:
void hoistLoopToNewParent(llvm::Loop&, llvm::BasicBlock&, llvm::DominatorTree&,
llvm::LoopInfo&): Assertion `OldContainingL->hasDedicatedExit\
s() && "Unexpected predecessor of hoisted loop preheader!"' failed.
Stack dump:
0. Program arguments: /home/ijonpan/llvm/build/llvm-dev/bin/opt
-mtriple=s390x-linux-gnu -O3 -mcpu=z13 -enable-simple-loop-unswitch
./tc_simpleloopunsw.ll
1. Running pass 'CallGraph Pass Manager' on module
'./tc_simpleloopunsw.ll'.
2. Running pass 'Loop Pass Manager' on function '@func_9'
3. Running pass 'Simple unswitch loops' on basic block '%bb9'
...</pre>
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