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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - vectorizer will turn i1* -> <n x i1>*"
href="http://llvm.org/bugs/show_bug.cgi?id=19436">19436</a>
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<th>Summary</th>
<td>vectorizer will turn i1* -> <n x i1>*
</td>
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<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
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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>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Loop Optimizer
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>hfinkel@anl.gov
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=12377" name="attach_12377" title="test case">attachment 12377</a> <a href="attachment.cgi?id=12377&action=edit" title="test case">[details]</a></span>
test case
As demonstrated in the attached test case, the loop vectorizer will happily
turn a consecutive i1* load/store into a <n x i1>* load/store. However, my
understanding is that, although LLVM is currently inconsistent about this, the
desired memory representation of <n x i1> is packed, and so this transformation
is invalid.
The easiest thing will be to disable vectorizing i1*; alternatively, we could
vectorize by casting to <n x i8>* and back again.</pre>
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