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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 - No loop vectorization for loop guarded by condition"
href="https://bugs.llvm.org/show_bug.cgi?id=47670">47670</a>
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<th>Summary</th>
<td>No loop vectorization for loop guarded by condition
</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>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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</tr>
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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>No vectorization:
unsigned sum_small(unsigned data[], bool b) {
unsigned sum = 0;
if (b) {
for (int i = 0; i < 32; ++i) {
sum += data[i];
}
}
return sum;
}
Vectorized:
unsigned sum_small(unsigned data[], bool b) {
unsigned sum = 0;
// if (b) {
for (int i = 0; i < 32; ++i) {
sum += data[i];
}
// }
return sum;
}
<a href="https://godbolt.org/z/oWPf9x">https://godbolt.org/z/oWPf9x</a></pre>
</div>
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