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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - SLP vectorizer miscompiles reduction"
href="https://bugs.llvm.org/show_bug.cgi?id=46455">46455</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>SLP vectorizer miscompiles reduction
</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>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Loop Optimizer
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>benny.kra@gmail.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=23650" name="attach_23650" title="Unreduced test case">attachment 23650</a> <a href="attachment.cgi?id=23650&action=edit" title="Unreduced test case">[details]</a></span>
Unreduced test case
Test case is a bit large and will probably only work on Skylake + Linux.
$ clang++ -O3 module_0000.ir-no-opt.ll driver.cc -march=skx && ./a.out
buffer-assignment.txt
Output:
(
2, 4
,
1, 2, 2, 2
)
$ clang++ -O3 module_0000.ir-no-opt.ll driver.cc -march=skx -mllvm
-vectorize-slp=false && ./a.out buffer-assignment.txt
Output:
(
3, 4
,
1, 2, 2, 2
)</pre>
</div>
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