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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Undefined behavior in CFGPrinter due to Twine misuse"
href="https://bugs.llvm.org/show_bug.cgi?id=37019">37019</a>
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<th>Summary</th>
<td>Undefined behavior in CFGPrinter due to Twine misuse
</td>
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<th>Product</th>
<td>libraries
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>All
</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>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Global Analyses
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>siu@continuum.io
</td>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre>The Twine usage in include/llvm/Analysis/CFGPrinter.h#L175
(<a href="https://github.com/llvm-mirror/llvm/blob/433eb70569ee6379cdd5181e72b9193fdb0a39dd/include/llvm/Analysis/CFGPrinter.h#L175">https://github.com/llvm-mirror/llvm/blob/433eb70569ee6379cdd5181e72b9193fdb0a39dd/include/llvm/Analysis/CFGPrinter.h#L175</a>)
is leading to an undefined behavior bug when LLVM is compiled with O2. The
error can be observed with `opt -dot-cfg` on a function that contains
branch-weight. The output DOT file will be corrupted.
Llvmlite has patched LLVM with <a href="https://github.com/numba/llvmlite/pull/343">https://github.com/numba/llvmlite/pull/343</a>. The
PR also contains test to replicate the problem.</pre>
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