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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - LoadStoreVectorizer crashes with out of bounds access to SetVector"
href="https://llvm.org/bugs/show_bug.cgi?id=29148">29148</a>
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<th>Summary</th>
<td>LoadStoreVectorizer crashes with out of bounds access to SetVector
</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>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</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>Matthew.Arsenault@amd.com
</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>Created <span class=""><a href="attachment.cgi?id=17053" name="attach_17053" title="Testcase">attachment 17053</a> <a href="attachment.cgi?id=17053&action=edit" title="Testcase">[details]</a></span>
Testcase
This loop looks suspicious:
for (int Head : Heads) {
if (InstructionsProcessed.count(Instrs[Head]))
continue;
bool longerChainExists = false;
for (unsigned TIt = 0; TIt < Tails.size(); TIt++) {
if (Head == Tails[TIt] &&
!InstructionsProcessed.count(Instrs[Heads[TIt]])) {
The loop over tails is indexing into Heads with TIt. If I fix this, all tests
pass except for X86/subchain-interleaved.ll, which then fails to vectorize some
of the cases</pre>
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