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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - NewGVN fails to verify memory congruency"
href="https://llvm.org/bugs/show_bug.cgi?id=31573">31573</a>
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<tr>
<th>Summary</th>
<td>NewGVN fails to verify memory congruency
</td>
</tr>
<tr>
<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>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Scalar Optimizations
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>davide@freebsd.org
</td>
</tr>
<tr>
<th>CC</th>
<td>dberlin@dberlin.org, llvm-bugs@lists.llvm.org, paulsson@linux.vnet.ibm.com
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</tr>
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<th>Blocks</th>
<td>30995
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Reduced from Jonas Paulsson's report.
define void @patatino(i8* %blah) {
entry:
br label %while.cond
while.cond:
%meh = phi i8* [ %blah, %entry ], [ null, %while.body ]
switch i32 undef, label %while.body [
i32 666, label %while.end
]
while.body:
br label %while.cond
while.end:
store i8 0, i8* %meh, align 1
store i8 0, i8* %blah, align 1
ret void
}
$ opt -newgvn patatuccio.ll -o /dev/null
opt: ../lib/Transforms/Scalar/NewGVN.cpp:1477: void
NewGVN::verifyMemoryCongruency(): Assertion
`ValueToClass.lookup(FirstMUD->getMemoryInst()) ==
ValueToClass.lookup(SecondMUD->getMemoryInst()) && "The instructions for these
memory operations should have been in " "the same congruence class"' failed.
[...]</pre>
</div>
</p>
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