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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 - armv7-m target uses invalid 'smmls' instruction"
href="https://bugs.llvm.org/show_bug.cgi?id=38765">38765</a>
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<th>Summary</th>
<td>armv7-m target uses invalid 'smmls' instruction
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>6.0
</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>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>-New Bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>arnd@linaro.org
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=20803" name="attach_20803" title="linux/drivers/gpu/drm/drm_dp_mst_topology.c, preprocessed">attachment 20803</a> <a href="attachment.cgi?id=20803&action=edit" title="linux/drivers/gpu/drm/drm_dp_mst_topology.c, preprocessed">[details]</a></span>
linux/drivers/gpu/drm/drm_dp_mst_topology.c, preprocessed
Linux kernel randconfig testing on arm produced a build error:
$ clang+llvm-6.0.1-x86_64-linux-gnu-ubuntu-16.04/bin/clang
-Wparentheses-equality -O2 -Wno-unused -Wno-pointer-sign
--target=arm-linux-gnueabi -no-integrated-as -march=armv7-m -c
drm_dp_mst_topology.i
/tmp/drm_dp_mst_topology-bcb935.s: Assembler messages:
/tmp/drm_dp_mst_topology-bcb935.s:3067: Error: selected processor does not
support `smmls r2,r6,r0,r1' in Thumb mode
This does not happen with the integrated assembler, which accepts the smmls
instruction as valid even for armv7-m. According to
<a href="http://www.keil.com/support/man/docs/armasm/armasm_dom1361289901461.htm">http://www.keil.com/support/man/docs/armasm/armasm_dom1361289901461.htm</a>, it
should be valid only on armv7e-m but not armv7-m.</pre>
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