<html>
<head>
<base href="https://llvm.org/bugs/" />
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - SLPVectorizer misses a vectorization opportunity BBVectorizer doesn't"
href="https://llvm.org/bugs/show_bug.cgi?id=25085">25085</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>SLPVectorizer misses a vectorization opportunity BBVectorizer doesn't
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>3.7
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>pekka.jaaskelainen@tut.fi
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=15017" name="attach_15017" title="LLVM IR without BBVectorizer">attachment 15017</a> <a href="attachment.cgi?id=15017&action=edit" title="LLVM IR without BBVectorizer">[details]</a></span>
LLVM IR without BBVectorizer
Attached are two .ll files from pocl kernel compiler after parallel region
formation. I have marked "See here" in parallel-bbvectorize.ll to the first
place where I spotted a vectorized instruction which wasn't in
parallel-no-bbvectorize.ll.
This is from NBody case from AMD SDK. It causes a major performance regression
in case BBVectorizer is disabled.
See the pocl bug <a href="https://github.com/pocl/pocl/issues/251">https://github.com/pocl/pocl/issues/251</a>
Is this helpful in fixing the issue? Let me know if you want me to try and
patches.</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>