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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - __builtin_shuffle parsing bug"
href="https://bugs.llvm.org/show_bug.cgi?id=37870">37870</a>
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<th>Summary</th>
<td>__builtin_shuffle parsing bug
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>unspecified
</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>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>zhonghao@pku.org.cn
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>The code is as follow:
typedef int V __attribute__((vector_size (16)));
V a, b, c;
int
foo ()
{
return __builtin_shuffle (a, b, c)[3];
}
int
main ()
{
a = (V) { 1, 2, 3, 4 };
b = (V) { 5, 6, 7, 8 };
c = (V) { 7, 2, 5, 6 };
if (foo () != 7)
__builtin_abort ();
return 0;
}
clang++ rejects the code with an error message:
error: use of undeclared identifier '__builtin_shuffle'
return __builtin_shuffle (a, b, c)[3];
^
1 error generated.
The code comes from a gcc bug report:
<a href="https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78089">https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78089</a>
Jakub Jelinek explained why it is a bug.</pre>
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</p>
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