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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Bad Thumb2 code generated, SUB.W SP,"
href="https://llvm.org/bugs/show_bug.cgi?id=25275">25275</a>
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<th>Summary</th>
<td>Bad Thumb2 code generated, SUB.W SP,
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</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>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</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>
<tr>
<th>Reporter</th>
<td>bagel99@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>This is a regression since 3.6.0.
LLVM version 3.7.0 and trunk generate:
mov r0, sp
sub.w sp, r0, #8 <-- BAD!! rd of sp is undefined
gnu as gives following error message:
Error: r13 not allowed here -- `sub.w sp,r0,#8'
LLVM version 3.6.0 generated:
mov r0, sp
sub.w r1, r0, #8
mov sp, r1
The source code that generates this is somewhat complex. If necessary, I'll
try to find a small .ll test case.</pre>
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