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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Accessing element of struct prevents vectorization"
href="https://bugs.llvm.org/show_bug.cgi?id=46902">46902</a>
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<th>Summary</th>
<td>Accessing element of struct prevents vectorization
</td>
</tr>
<tr>
<th>Product</th>
<td>tools
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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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>joel.hutton@arm.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>The following snippet:
include <stdint.h>$
struct foo;$
typedef struct foo {$
int x;$
} foo;$
$
void bar(unsigned char dst, unsigned char src,$
foo *f, int i_max) {$
for (int i = 0; i < i_max; i++)$
dst[i] = (src[i] + f->x);$
}$
cannot be vectorized by LLVM trunk. However, if f->x is replaced by an integer
passed as a parameter, it can be vectorized. This can be vectorized by GCC
trunk.
Tested on aarch64-linux</pre>
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