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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - NewGVN failure while verifying memory congruency"
href="https://llvm.org/bugs/show_bug.cgi?id=31594">31594</a>
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<th>Summary</th>
<td>NewGVN failure while verifying 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>
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<th>OS</th>
<td>Windows NT
</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>
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<th>Component</th>
<td>Scalar Optimizations
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>davide@freebsd.org
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>I think this is a slight variation of PR31573.
store i8 0, i8* %blah, align 1
and
store i8 0, i8* %foo.lcssa, align 1
are believed to be congruent but they belong to two different congruence
classes, hence the assertion firing.
define void @patatino(i8* %blah, i32 %choice) {
entry:
br label %while.cond
while.cond:
%foo = phi i8* [ %blah, %entry ], [ null, %while.body ]
switch i32 %choice, label %while.body [
i32 -1, label %while.end
i32 40, label %land.end
]
land.end:
br label %while.end
while.body:
br label %while.cond
while.end:
%foo.lcssa = phi i8* [ %foo, %land.end ], [ %foo, %while.cond ]
store i8 0, i8* %foo.lcssa, align 1
%0 = load i8, i8* %blah, align 1
%loaded = icmp eq i8 %0, 0
store i8 0, i8* %blah, align 1
ret void
}</pre>
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</p>
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