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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [ARM64] assert unimplemented reg-to-reg copy"
href="https://bugs.llvm.org/show_bug.cgi?id=40693">40693</a>
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<th>Summary</th>
<td>[ARM64] assert unimplemented reg-to-reg copy
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>8.0
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>LLVM Codegen
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>al.grant@arm.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<p>
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<pre>Fails on 8.0.0-rc2 at -O1 or higher (-O0 is ok).
clang -O2 --target=aarch64-linux-gnu -march=armv8.1a
void inc128(__int128 *p)
{
__int128 n, nn;
do {
__atomic_load(p, &n, __ATOMIC_RELAXED);
n = n + 1;
} while (!__sync_bool_compare_and_swap(p, n, nn));
}</pre>
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