<html>
<head>
<base href="https://llvm.org/bugs/" />
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Second argument to signed Neon vtbl functions should be unsigned"
href="https://llvm.org/bugs/show_bug.cgi?id=23324">23324</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Second argument to signed Neon vtbl functions should be unsigned
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</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>Headers
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>lennox@cs.columbia.edu
</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>The ARM C Language Extensions document (ACLE) specifies that the second (index)
parameter to the vtbl and vtbx family of functions should be unsigned, even
when the other parameters are signed:
Aarch32:
T vtblN_ST(TxN a, UT b);
T vtbxN_ST(T a, TxN b, UT c);
Aarch64:
T vqtblNQ_ST (T2xN t, UT idx);
T vqtbxNQ_ST (T a, T2xN t, UT idx);
E.g.,
int8x8_t vqtbl1_s8 (int8x16_t a, uint8x8_t b)
Clang declares them to be signed, instead.
GCC has had these correct for Aarch64 since GCC 4.9, though for ARM (Aarch32)
it still has the second value signed.</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>