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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Missed Loop vectorization for global loop variants"
href="https://bugs.llvm.org/show_bug.cgi?id=40946">40946</a>
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<th>Summary</th>
<td>Missed Loop vectorization for global loop variants
</td>
</tr>
<tr>
<th>Product</th>
<td>tools
</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>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>opt
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>balarishi.bhogadi@amd.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>If the loop variant variables are functional parameters of point type, then
loop vectorizations happens.
But, When loop variant variables are global, loop vectorization is not taking
place.
===========
// Flag: -O3 -fno-unroll-loops -c
char *a, *b, *c;
void loop_not_vectorized()
{
for (int i = 0; i < 1800; i++) // Loop not vectorized
{
a[i] = b[i] * c[i];
}
}
===========
// Flag: -O3 -fno-unroll-loops -c
void loop_vectorized(char *a, char *b, char *c)
{
for (int i = 0; i < 1800; i++) // Loop vectorized
{
a[i] = b[i] * c[i];
}
}
===========</pre>
</div>
</p>
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