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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [MemorySSA][SimpleUnswitch] Assertion `dominates(MD, U) && "Memory Def does not dominate it's uses"' failed"
href="https://bugs.llvm.org/show_bug.cgi?id=43641">43641</a>
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<tr>
<th>Summary</th>
<td>[MemorySSA][SimpleUnswitch] Assertion `dominates(MD, U) && "Memory Def does not dominate it's uses"' failed
</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>All
</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>
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<th>Component</th>
<td>Scalar Optimizations
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>jji@us.ibm.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=22651" name="attach_22651" title="Reduced IR file">attachment 22651</a> <a href="attachment.cgi?id=22651&action=edit" title="Reduced IR file">[details]</a></span>
Reduced IR file
$ cat t2.c
int a;
long b;
void c(d) {
while (a) {
e();
if ((b < 0 || d && b) == 0)
break;
}
}
$clang -O3 -fexperimental-new-pass-manager -mllvm -enable-nontrivial-unswitch
-emit-llvm -S t2.c
opt: .../llvm-project/llvm/lib/Analysis/MemorySSA.cpp:2041: void
llvm::MemorySSA::verifyDomination(llvm::Function &) const: Assertion
`dominates(MD, U) && "Memory Def does not dominate it's uses"' failed.
---
Reduced IR attached.
opt -passes="default<O3>" -enable-nontrivial-unswitch -S reduced.ll</pre>
</div>
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