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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [LoopInterchange] Missed optimization with no dependencies."
href="https://llvm.org/bugs/show_bug.cgi?id=30472">30472</a>
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<th>Summary</th>
<td>[LoopInterchange] Missed optimization with no dependencies.
</td>
</tr>
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<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>
</tr>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Loop Optimizer
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>mcrosier@codeaurora.org
</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>If I'm not mistaken, we should be able to interchange the below loop, but we
currently don't.
unsigned no_deps_interchange(unsigned **Arr, unsigned k) {
unsigned sum = 0;
for (int i = 0; i < 1024; ++i)
for(int j = 0; j < 1024; ++j)
sum += Arr[j][i] + k;
return sum;
}
The first issue is that we bail from loop interchange if we don't find any
dependencies (i.e., DepMatrix.size() == 0).</pre>
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</p>
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