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<base href="http://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - inline asm fails with -O2 for aarch64"
href="http://llvm.org/bugs/show_bug.cgi?id=17728">17728</a>
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</tr>
<tr>
<th>Summary</th>
<td>inline asm fails with -O2 for aarch64
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>charlebm@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=11440" name="attach_11440" title="Test file">attachment 11440</a> <a href="attachment.cgi?id=11440&action=edit" title="Test file">[details]</a></span>
Test file
The attached code will compile with gcc and clang with no optimization but will
generate the following error when compiled with clang with -O2 optimization
enabled:
(CROSS_COMPILE=aarch64-linux-gnu- ../../../toolchain/clang/install/bin/clang
-gcc-toolchain
../../../arch/aarch64/toolchain/linaro/gcc-linaro-aarch64-linux-gnu-4.8-2013.06_linux
-isystem ../../../toolchain/clang/install/bin/../lib/clang/3.4/include -I.
-target aarch64-none-linux-gnueabi -no-integrated-as
--sysroot=../../../arch/aarch64/toolchain/linaro/gcc-linaro-aarch64-linux-gnu-4.8-2013.06_linux/aarch64-linux-gnu/libc
-O2 -o t4 t4.c )
t4.c:15:23: error: invalid operand in inline asm: '// atomic_add
1: ldxr ${0:w}, [$3]
add ${0:w}, ${0:w}, ${4:w}
stxr ${1:w}, ${0:w}, [$3]
cbnz ${1:w}, 1b'
__asm__ __volatile__("// atomic_add\n"
^
t4.c:30:15: error: invalid operand in inline asm: '// atomic_sub
1: ldxr ${0:w}, [$3]
sub ${0:w}, ${0:w}, ${4:w}
stxr ${1:w}, ${0:w}, [$3]
cbnz ${1:w}, 1b'
asm volatile("// atomic_sub\n"
^
2 errors generated.
make: *** [t4] Error 1</pre>
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