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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 - Missed pattern to vectorize in Loop Vectorizer"
href="https://bugs.llvm.org/show_bug.cgi?id=52461">52461</a>
</td>
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<tr>
<th>Summary</th>
<td>Missed pattern to vectorize in Loop Vectorizer
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Loop Optimizer
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<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>void foo_32(int *a, unsigned N)
{
int p = 1;
for (unsigned i = 0; i < 32; i++, p*=2)
a[i] *= p; // SLP Vectorizer catches this.
}
void foo_N(int *a, unsigned N)
{
int p = 1;
for (unsigned i = 0; i < N; i++, p*=2)
a[i] *= p; // Loop Vectorizer fails to vectorize this code.
}
<a href="https://godbolt.org/z/qasEo3cd9">https://godbolt.org/z/qasEo3cd9</a></pre>
</div>
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