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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [Loop vectorizer] miscompile since r272715"
href="https://bugs.llvm.org/show_bug.cgi?id=33706">33706</a>
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<th>Summary</th>
<td>[Loop vectorizer] miscompile since r272715
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Loop Optimizer
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>Wolfgang_Pieb@playstation.sony.com
</td>
</tr>
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<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=18763" name="attach_18763" title="test case (different output with -O2 vs. -O0).">attachment 18763</a> <a href="attachment.cgi?id=18763&action=edit" title="test case (different output with -O2 vs. -O0).">[details]</a></span>
test case (different output with -O2 vs. -O0).
The attached test case produces different output for -O2 vs. -O0 compilation,
which we bisected down to the loop vectorizer. The failure started with
r272715, but appears to be masked whenever the GVNHoist pass is enabled (which
it currently isn't at r307289).
Apologies for not providing a more narrowed test case with opt/llc, but opt
resisted my attempts to find a set of switches that reproduces the failure.
Compile with
clang -O2 --target=x86_64-unknown-linux-gnu</pre>
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