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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - infinite recursion with opt -instcombine"
href="https://bugs.llvm.org/show_bug.cgi?id=47752">47752</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>infinite recursion with opt -instcombine
</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>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Scalar Optimizations
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>mikael.holmen@ericsson.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=24029" name="attach_24029" title="bbi-48251.ll reproducer">attachment 24029</a> <a href="attachment.cgi?id=24029&action=edit" title="bbi-48251.ll reproducer">[details]</a></span>
bbi-48251.ll reproducer
llvm commit: 1aa8e6a51a0eb
Reproduce with:
opt -S -o - bbi-48251.ll -instcombine
Result:
PLEASE submit a bug report to <a href="https://bugs.llvm.org/">https://bugs.llvm.org/</a> and include the crash
backtrace.
Stack dump:
0. Program arguments: ../../master/llvm/build-all/bin/opt -S -o -
bbi-48251.ll -instcombine
1. Running pass 'Function Pass Manager' on module 'bbi-48251.ll'.
2. Running pass 'Combine redundant instructions' on function '@g'
#0 0x00000000027d2723 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int)
(../../master/llvm/build-all/bin/opt+0x27d2723)
#1 0x00000000027d03ee llvm::sys::RunSignalHandlers()
(../../master/llvm/build-all/bin/opt+0x27d03ee)
#2 0x00000000027d2bdc SignalHandler(int)
(../../master/llvm/build-all/bin/opt+0x27d2bdc)
#3 0x00007fadc69978a0 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x128a0)
#4 0x00000000022e25f2 llvm::Negator::visitImpl(llvm::Value*, unsigned int)
(../../master/llvm/build-all/bin/opt+0x22e25f2)
#5 0x00000000022e4323 llvm::Negator::negate(llvm::Value*, unsigned int)
(../../master/llvm/build-all/bin/opt+0x22e4323)
#6 0x00000000022e34e1 llvm::Negator::visitImpl(llvm::Value*, unsigned int)
(../../master/llvm/build-all/bin/opt+0x22e34e1)
#7 0x00000000022e4323 llvm::Negator::negate(llvm::Value*, unsigned int)
(../../master/llvm/build-all/bin/opt+0x22e4323)
etc
This starts happening with commit 67266d879c7 from April 22:
[InstCombine] Negator: shufflevector is negatible
All these folds are correct as per alive-tv</pre>
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