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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Missed loop vectorization"
href="https://bugs.llvm.org/show_bug.cgi?id=39420">39420</a>
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<th>Summary</th>
<td>Missed loop vectorization
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
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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>
</tr>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</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
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<th>Reporter</th>
<td>david.bolvansky@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>We are unable to vectorize:
for (size_t i = 0; i < nrpt; i++) {
for (size_t j = 0; j < nsize; j++) {
a[j] = (float)0.0f;
}
for (size_t j = 0; j < nsize; j++) {
for (size_t k = 0; k < nsize; k++) {
a[j] += b[j] * c[j][k];
}
}
}
While GCC/ICC has no issues with this code. (-march=haswell)
Code example: <a href="https://godbolt.org/z/ooyf1N">https://godbolt.org/z/ooyf1N</a></pre>
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</p>
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