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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Missing vectorization for step 4"
href="https://bugs.llvm.org/show_bug.cgi?id=38330">38330</a>
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<th>Summary</th>
<td>Missing vectorization for step 4
</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>
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<th>Component</th>
<td>Scalar Optimizations
</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>Hello,
Code:
int vec_step_four(int *restrict A, int *restrict B, int *restrict C, int N) {
int sum = 0;
for (int i = 0; i < N; i += 4) {
C[i] = A[i] + B[i];
sum += C[i];
}
return sum;
}
Clang -O3 currently cannot vectorize this loop.
<a href="https://godbolt.org/g/NSHVVL">https://godbolt.org/g/NSHVVL</a></pre>
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