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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Segfault in X86TargetLowering::PerformDAGCombine"
href="https://bugs.llvm.org/show_bug.cgi?id=44002">44002</a>
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<th>Summary</th>
<td>Segfault in X86TargetLowering::PerformDAGCombine
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<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>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Backend: X86
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>lennart.braun@posteo.de
</td>
</tr>
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<th>CC</th>
<td>craig.topper@gmail.com, llvm-bugs@lists.llvm.org, llvm-dev@redking.me.uk, spatel+llvm@rotateright.com
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=22813" name="attach_22813" title="reduced reproducer and run script">attachment 22813</a> <a href="attachment.cgi?id=22813&action=edit" title="reduced reproducer and run script">[details]</a></span>
reduced reproducer and run script
Hi there,
the x86 code generation of clang/LLVM crashed on my source code. I was using
LLVM 9.0 but could also reproduce the problem with llvm/trunk 375507.
I used C-Reduce [0] to obtain a minimal input file triggering the bug. Then I
used bugpoint as described in [1] to get a reduced/simplified bitcode which
kills llc.
Attached are files with the following:
* reduced source code
* script to reproduce the crash
* clang-9 stack dump
* clang-10 stack dump (llvm/trunk 375507)
* simplified llvm bit code which crashes llc
[0]: <a href="https://github.com/csmith-project/creduce">https://github.com/csmith-project/creduce</a>
[1]: <a href="https://llvm.org/docs/HowToSubmitABug.html#code-generator-bugs">https://llvm.org/docs/HowToSubmitABug.html#code-generator-bugs</a>
Best
Lennart</pre>
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