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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - opt crashes with -enable-nontrivial-unswitch -passes=unswitch: Assertion `(L.contains(ChildN->getBlock()) || llvm::find(ExitBlocks, ChildN->getBlock()) != ExitBlocks.end()) && "Should never reach beyond the loop and exits when deleting!"' failed"
href="https://bugs.llvm.org/show_bug.cgi?id=36379">36379</a>
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<th>Summary</th>
<td>opt crashes with -enable-nontrivial-unswitch -passes=unswitch: Assertion `(L.contains(ChildN->getBlock()) || llvm::find(ExitBlocks, ChildN->getBlock()) != ExitBlocks.end()) && "Should never reach beyond the loop and exits when deleting!"' failed
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</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>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Loop Optimizer
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>fedor.v.sergeev@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Fails on a rather simple IR:
] cat bad-unswitch.ll
define void @test() {
br label %check1
check1:
br i1 true, label %check2, label %check1
check2:
br i1 true, label %check3, label %zero
check3:
br i1 true, label %check4, label %zero
check4:
br i1 true, label %check3, label %check1
zero:
ret void
}
] opt --enable-nontrivial-unswitch -passes=unswitch --disable-output
bad-unswitch.ll
opt: lib/Transforms/Scalar/SimpleLoopUnswitch.cpp:1238: void
deleteDeadBlocksFromLoop(llvm::Loop&, llvm::BasicBlock*,
llvm::SmallVectorImpl<llvm::BasicBlock*>&, llvm::DominatorTree&,
llvm::LoopInfo&): Assertion `(L.contains(ChildN->getBlock()) ||
llvm::find(ExitBlocks, ChildN->getBlock()) != ExitBlocks.end()) && "Should
never reach beyond the loop and exits when deleting!"' failed.
]
Originally it was failing on a considerably more complicated testcase where
trivial unswitch failed to perform any unswitches and I had to enable
nontrivial one. Got this assert immediately, reduced down to the above bits.</pre>
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