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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [Vectorizer] Implement interleaved stride vectorization"
href="http://llvm.org/bugs/show_bug.cgi?id=17679">17679</a>
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<th>Summary</th>
<td>[Vectorizer] Implement interleaved stride vectorization
</td>
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<th>Product</th>
<td>libraries
</td>
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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>
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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>renato.golin@linaro.org
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</tr>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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</tr>
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<th>Classification</th>
<td>Unclassified
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</tr></table>
<p>
<div>
<pre>After implementing the non-interleaved vectorization, detect interleaved
patterns, such as:
for (i..N/3) {
a[3*i] = b[3*i] + I;
a[3*i+1] = b[3*i+1] + J;
a[3*i+2] = b[3*i+2] + K;
}
Where you can unroll this into:
for (i..N/3) {
a[3*i] = b[3*i] + I;
a[3*i+3] = b[3*i+3] + I;
a[3*i+6] = b[3*i+6] + I;
a[3*i+9] = b[3*i+9] + I;
a[3*i+1] = b[3*i+1] + J;
a[3*i+4] = b[3*i+4] + J;
a[3*i+7] = b[3*i+7] + J;
a[3*i+10] = b[3*i+10] + J;
a[3*i+2] = b[3*i+2] + K;
a[3*i+5] = b[3*i+5] + K;
a[3*i+8] = b[3*i+8] + K;
a[3*i+11] = b[3*i+11] + K;
}
And use interleaved reads/writes, for example ARM's VLDN/VSTN.</pre>
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