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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [MemorySSA + EXPENSIVE_CHECKS] Assertion "Found clobber before reaching ClobberAt!"' failed."
href="https://bugs.llvm.org/show_bug.cgi?id=40509">40509</a>
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<th>Summary</th>
<td>[MemorySSA + EXPENSIVE_CHECKS] Assertion "Found clobber before reaching ClobberAt!"' failed.
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<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>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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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>Scalar Optimizations
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>paulsson@linux.vnet.ibm.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=21399" name="attach_21399" title="reduced testcase">attachment 21399</a> <a href="attachment.cgi?id=21399&action=edit" title="reduced testcase">[details]</a></span>
reduced testcase
Building opt with EXPENSIVE_CHECKS seems to expose a problem in MemorySSA:
bin/opt -mtriple=systemz-unknown -march=z13 -S -O3 tc_memssa.ll
-enable-mssa-loop-dependency
lib/Analysis/MemorySSA.cpp:440: void checkClobberSanity(const
llvm::MemoryAccess*, llvm::MemoryAccess*, const llvm::MemoryLocation&,
const llvm::MemorySSA&, const {anonymous}::UpwardsMemoryQuery&,
llvm::AliasAnalysis&, bool): Assertion `!instructionClobbersQuery(MD,
MAP.second, Query.Inst, AA) .IsClo
bber && "Found clobber before reaching ClobberAt!"' failed.</pre>
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