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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Cannot encode LSL with REX.W prefix"
href="https://bugs.llvm.org/show_bug.cgi?id=34568">34568</a>
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<tr>
<th>Summary</th>
<td>Cannot encode LSL with REX.W prefix
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>4.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
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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>Backend: X86
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>kadircetinkaya.06.tr@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>LSL RAX, EBX
cannot be assembled, but as mentioned in July 2017 version of the Instruction
Set Reference page 649 it is possible to encode this instruction with
REX.W + 0F 03 /r
LSL r64, r32/m16*
Load: r64 ← segment limit, selector r32/m16
this encoding specificaiton.</pre>
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