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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Failure to vectorize accumulation when result is stored in memory"
href="https://bugs.llvm.org/show_bug.cgi?id=52128">52128</a>
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<th>Summary</th>
<td>Failure to vectorize accumulation when result is stored in memory
</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>
</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>
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<th>Component</th>
<td>Scalar Optimizations
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>gabravier@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>void mac(const int *b, int *sum)
{
int dotp = 0;
for (int i = 0; i < 32; i++)
dotp += b[i];
*sum = dotp;
}
This is not vectorized, but could be. This is done by GCC, but not by LLVM.
PS: Oddly, this can easily be changed to vectorize, but only by making it so
`dotp` is returned instead of stored into memory.</pre>
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