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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - loop-vectorizer regression on x86-32"
href="http://llvm.org/bugs/show_bug.cgi?id=16592">16592</a>
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<th>Summary</th>
<td>loop-vectorizer regression on x86-32
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<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>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>new bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>baldrick@free.fr
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=10856" name="attach_10856" title="IR that used to loop-vectorize">attachment 10856</a> <a href="attachment.cgi?id=10856&action=edit" title="IR that used to loop-vectorize">[details]</a></span>
IR that used to loop-vectorize
This
void bar(float *A, float* B, float K) {
int i;
for (i = 0; i < 64; ++i)
A[i] *= B[i] + K;
}
used to vectorize with dragonegg on x86-32 (with -O3 -msse), but stopped
vectorizing recently. Note that it still vectorizes with clang, I think
because clang outputs inbounds GEPs for the array accesses while dragonegg
doesn't.
It still vectorizes on x86-64, but it's not clear to me why it is better on 64
bit.
IR attached.</pre>
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