<html>
<head>
<base href="https://bugs.llvm.org/">
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - LOCK/REP/REPNE prefixes emitted as instruction on their own"
href="https://bugs.llvm.org/show_bug.cgi?id=34475">34475</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>LOCK/REP/REPNE prefixes emitted as instruction on their own
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>4.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<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>readPrefixes in lib/Target/X86/Disassembler/X86DisassemblerDecoder.cpp treats
0xf0, 0xf2 and 0xf3 as instructions instead of prefixes, so
echo '0xf2 0xa4' | llvm-mc -disassemble
this one outputs
repne
movsb
as two separate instructions, while repne doesn't have a meaning without movsb.</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>