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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - ARM "J" assembler constraint range for Thumb2 incorrect"
href="https://llvm.org/bugs/show_bug.cgi?id=26061">26061</a>
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<th>Summary</th>
<td>ARM "J" assembler constraint range for Thumb2 incorrect
</td>
</tr>
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<th>Product</th>
<td>clang
</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>
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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>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The arch/arm/probes/kprobes/core.c file in the Linux kernel fails to build in
Thumb-2 mode because of a small positive number passed as an argument to the
"J" constraint
arch/arm/probes/kprobes/core.c:540:3: error: invalid operand for inline asm
constraint 'J'
Gcc accepts the range from -4095 to +4095 for "J" in Thumb-2 mode and -255 to
-1 for Thumb-1 mode, while clang only accepts the -255 to -1 for both Thumb-2
and Thumb-1 mode.</pre>
</div>
</p>
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