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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [SLP] Missing vectorization of a reduction loop"
href="https://bugs.llvm.org/show_bug.cgi?id=47726">47726</a>
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<th>Summary</th>
<td>[SLP] Missing vectorization of a reduction loop
</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>Windows NT
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Scalar Optimizations
</td>
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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>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre>int foo(int d[64], int r) {
for (unsigned i = 0; i < 64; ++i) r -= d[i];
return r;
}
<a href="https://godbolt.org/z/GYqdrh">https://godbolt.org/z/GYqdrh</a>
Loop is vectorized with -fno-unroll-loops.
Also no problems with:
int foo(int d[64], int n, int r) {
for (unsigned i = 0; i < n; ++i) r -= d[i];
return r;
}</pre>
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