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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - nopl %ebx is not recognized as valid assembly"
href="http://bugs.llvm.org/show_bug.cgi?id=32805">32805</a>
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<th>Summary</th>
<td>nopl %ebx is not recognized as valid assembly
</td>
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<th>Product</th>
<td>libraries
</td>
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<th>Version</th>
<td>trunk
</td>
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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>enhancement
</td>
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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
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<th>Reporter</th>
<td>Pidgeot18@gmail.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre>$ echo "nopl %ebx" | llvm-mc
.text
<stdin>:1:6: error: invalid operand for instruction
nopl %ebx
^~~~
$ echo "nopl %ebx" | as && objdump -d a.out
a.out: file format elf64-x86-64
Disassembly of section .text:
0000000000000000 <.text>:
0: 0f 1f c3 nop %ebx
Although the manual recommends that the multi-byte sequences use only the
memory forms, I don't see much of a reason to ignore the register forms for the
Mod/RM byte.</pre>
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