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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - PowerPC64 missing 16 byte atomic ops"
href="https://llvm.org/bugs/show_bug.cgi?id=25933">25933</a>
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<th>Summary</th>
<td>PowerPC64 missing 16 byte atomic ops
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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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: PowerPC
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>anton@samba.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 following test case:
int main(void)
{
__uint128_t x;
__sync_val_compare_and_swap_16(&x, 1, 0);
}
works on gcc:
$ gcc -mcpu=power8 -O2 test.c
but fails on clang:
$ clang -mcpu=power8 -O2 test.c
/tmp/test-bae14f.o: In function `main':
test.c:(.text+0x34): undefined reference to `__sync_val_compare_and_swap_16'</pre>
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