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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - vector comparison 'less than' miscompiled on avx2"
href="http://llvm.org/bugs/show_bug.cgi?id=17899">17899</a>
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<th>Summary</th>
<td>vector comparison 'less than' miscompiled on avx2
</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>
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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>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Backend: X86
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>kraiskil@ovi.com
</td>
</tr>
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<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=11526" name="attach_11526" title="Sample reduced source to show the bug">attachment 11526</a> <a href="attachment.cgi?id=11526&action=edit" title="Sample reduced source to show the bug">[details]</a></span>
Sample reduced source to show the bug
The following OpenCL code is miscompiled when targeting core-avx2 CPU:s
c < (short16)0 ? b : a
Only 'less that' seems to be miscompiled, all other comparisons that I tried
give the correct result. Also all shorter that 16xi16 vectors work fine.
Attached is a tar.gz with complete example code. When compiling with CPU
corei7, the result is correct, when compiling with core-avx2 it is wrong:
$./run.sh corei7
res1.x=a
$./run.sh core-avx2
res1.x=b</pre>
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