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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - GVN miscompile"
href="https://bugs.llvm.org/show_bug.cgi?id=31953">31953</a>
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<th>Summary</th>
<td>GVN miscompile
</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>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
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<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>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>mehdi.amini@apple.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=17975" name="attach_17975" title="GVN bug test-case">attachment 17975</a> <a href="attachment.cgi?id=17975&action=edit" title="GVN bug test-case">[details]</a></span>
GVN bug test-case
I haven't been able to figure out why, but this is annoyingly miscompiling a
quite simple C++ file:
$ opt -gvn opt.before.gvn.bc -o opt.bc && llc opt.bc -filetype=obj -o
opt.llc.o && clang opt.llc.o && ./a.out | grep TEST2
… oldCodeResult is INCORRECT
Without GVN:
$ opt opt.before.gvn.bc -o opt.bc && llc opt.bc -filetype=obj -o
opt.llc.o && clang opt.llc.o && ./a.out | grep TEST2
… oldCodeResult is OK</pre>
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