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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Assert in LoopUnroll.cpp: Loops should be in LCSSA form after loop-unroll."
href="https://llvm.org/bugs/show_bug.cgi?id=26688">26688</a>
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<th>Summary</th>
<td>Assert in LoopUnroll.cpp: Loops should be in LCSSA form after loop-unroll.
</td>
</tr>
<tr>
<th>Product</th>
<td>tools
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<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>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>opt
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>karl-johan.karlsson@ericsson.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=15929" name="attach_15929" title="Reproducer: ./opt -S -loop-rotate -licm -instcombine -loop-unroll ./loopunroll.ll -o -">attachment 15929</a> <a href="attachment.cgi?id=15929&action=edit" title="Reproducer: ./opt -S -loop-rotate -licm -instcombine -loop-unroll ./loopunroll.ll -o -">[details]</a></span>
Reproducer: ./opt -S -loop-rotate -licm -instcombine -loop-unroll
./loopunroll.ll -o -
$ ./opt -S -loop-rotate -licm -instcombine -loop-unroll ./loopunroll.ll -o -
opt: ../lib/Transforms/Utils/LoopUnroll.cpp:604: bool
llvm::UnrollLoop(llvm::Loop *, unsigned int, unsigned int, bool, bool, unsigned
int, llvm::LoopInfo *, llvm::ScalarEvolution *, llvm::DominatorTree *,
llvm::AssumptionCache *, bool): Assertion `OuterL->isLCSSAForm(*DT) && "Loops
should be in LCSSA form after loop-unroll."' failed.
0 opt 0x00000000016a1138
llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 40
1 opt 0x000000000169f906 llvm::sys::RunSignalHandlers() + 54
2 opt 0x00000000016a1c6a
3 libpthread.so.0 0x00007f3231779340
4 libc.so.6 0x00007f32309a1cc9 gsignal + 57
5 libc.so.6 0x00007f32309a50d8 abort + 328
6 libc.so.6 0x00007f323099ab86
7 libc.so.6 0x00007f323099ac32
8 opt 0x00000000016f3844
9 opt 0x00000000015848c9
10 opt 0x0000000000f1ad7f
llvm::LPPassManager::runOnFunction(llvm::Function&) + 799
11 opt 0x00000000012cfc78
llvm::FPPassManager::runOnFunction(llvm::Function&) + 344
12 opt 0x00000000012cfebb
llvm::FPPassManager::runOnModule(llvm::Module&) + 43
13 opt 0x00000000012d0375
llvm::legacy::PassManagerImpl::run(llvm::Module&) + 869
14 opt 0x000000000062036e main + 8670
15 libc.so.6 0x00007f323098cec5 __libc_start_main + 245
16 opt 0x000000000060f96c
Stack dump:
0. Program arguments: ./opt -S -loop-rotate -licm -instcombine
-loop-unroll ./loopunroll.ll -o -
1. Running pass 'Function Pass Manager' on module './loopunroll.ll'.
2. Running pass 'Loop Pass Manager' on function '@fn1'
3. Running pass 'Unroll loops' on basic block '%bb4'
Aborted (core dumped)</pre>
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