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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Instruction with incorrect VEX prefix W value decoded as valid"
href="https://bugs.llvm.org/show_bug.cgi?id=32804">32804</a>
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<th>Summary</th>
<td>Instruction with incorrect VEX prefix W value decoded as valid
</td>
</tr>
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<th>Product</th>
<td>libraries
</td>
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<th>Version</th>
<td>3.9
</td>
</tr>
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<th>Hardware</th>
<td>Other
</td>
</tr>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>MC
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>nholcomb@wisc.edu
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>The following instruction should be incorrect because 3rd byte is incorrect for
this instruction to be valid. The third byte must have a leading zero (for the
W bit of vex).
Bytes: 8f 08 f0 86 25 24 bf 73 eb ba
LLVM Output: vpmacsswd %xmm11, -344735964(%rip), %xmm1, %xmm12
Expected: decoder should return error</pre>
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