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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Crash in 'Machine Common Subexpression Elimination' and possibly other passes"
href="https://bugs.llvm.org/show_bug.cgi?id=35392">35392</a>
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<th>Summary</th>
<td>Crash in 'Machine Common Subexpression Elimination' and possibly other passes
</td>
</tr>
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<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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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>Common Code Generator Code
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>rtrieu@google.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<pre>Created <span class=""><a href="attachment.cgi?id=19458" name="attach_19458" title="Example code">attachment 19458</a> <a href="attachment.cgi?id=19458&action=edit" title="Example code">[details]</a></span>
Example code
Stack dump:
0. Program arguments: clang -cc1 -triple x86_64-unknown-linux-gnu
-emit-obj -target-cpu x86-64 -O1 -std=c++11 -fsanitize=address -x c++ test.cpp
1. <eof> parser at end of file
2. Code generation
3. Running pass 'Function Pass Manager' on module 'test.cpp'.
4. Running pass 'Machine Common Subexpression Elimination' on function
'@_ZNK1S3RunER1RR4Pair'
Segmentation fault (core dumped)
clang -cc1 -triple x86_64-unknown-linux-gnu -emit-obj -target-cpu x86-64 -O1
-std=c++11 -fsanitize=address -x c++ test.cpp
The attached file uses macros to generate many repetitive branches in the
function. Once preprocessed, the code is over four thousands lines. Compiling
can take a few minutes. MachineCSE was not the only pass seen while reducing
this example. These are all the passes seen in crash logs:
'Machine Common Subexpression Elimination'
'X86 DAG->DAG Instruction Selection'
'Live Variable Analysis'
'X86 Optimize Call Frame'</pre>
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