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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - MOVS with shifted register incorrectly rejected for armv6-m"
href="https://bugs.llvm.org/show_bug.cgi?id=44583">44583</a>
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<th>Summary</th>
<td>MOVS with shifted register incorrectly rejected for armv6-m
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<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: ARM
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>john.brawn@arm.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, peter.smith@linaro.org, Ties.Stuij@arm.com
</td>
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<p>
<div>
<pre>Doing
echo "movs r0, r1, lsl #1" | llvm-mc --triple=armv6m-arm-none-eabi
--show-encoding
gets the error
<stdin>:1:1: error: invalid instruction, any one of the following would fix
this:
movs r0, r1, lsl #1
^
<stdin>:1:14: note: operand must be an immediate in the range [0,255]
movs r0, r1, lsl #1
^
<stdin>:1:14: note: operand must be a register in range [r0, r7]
movs r0, r1, lsl #1
^
The armv6-m armarm defines this instruction as an alias of lsls (in section
A6.7.41 MOV shifted register). When assembling for 7-M we do get the correct
encoding:
echo "movs r0, r1, lsl #1" | llvm-mc --triple=armv7m-arm-none-eabi
--show-encoding
gives
.text
lsls r0, r1, #1 @ encoding: [0x48,0x00]</pre>
</div>
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