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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Wrong disassembling for SWC2 & SWC3"
href="http://llvm.org/bugs/show_bug.cgi?id=21015">21015</a>
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<th>Summary</th>
<td>Wrong disassembling for SWC2 & SWC3
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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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>new bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>junkoi2004@gmail.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>There are 2 bugs with SWC2 & SWC3
(1) SWC2 seems to be wrongly handled: the disassembling disagree with
assembling on first operand ($0 vs $f0)
$ echo "swc2 \$0, 0(\$zero)"|./Release+Asserts/bin/llvm-mc -assemble -arch=mips
-show-encoding
.text
swc2 $0, 0($zero) # encoding: [0xe8,0x00,0x00,0x00]
$ echo "0xe8,0x00,0x00,0x00" | ./Release+Asserts/bin/llvm-mc -disassemble
-arch=mips -show-encoding
.text
swc2 $f0, 0($zero) # encoding: [0xe8,0x00,0x00,0x00]
(2) Meanwhile, SWC3 can be assembled, but cannot be disassembled
$ echo "swc3 \$0, 0(\$zero)"|./Release+Asserts/bin/llvm-mc -assemble -arch=mips
-show-encoding
.text
swc3 $0, 0($zero) # encoding: [0xec,0x00,0x00,0x00]
$ echo "0xec,0x00,0x00,0x00" | ./Release+Asserts/bin/llvm-mc -disassemble
-arch=mips -show-encoding
.text
<stdin>:1:1: warning: invalid instruction encoding
0xec,0x00,0x00,0x00</pre>
</div>
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