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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [ARM][NEON] Missing vXi64 popcnt lowering"
href="https://bugs.llvm.org/show_bug.cgi?id=39281">39281</a>
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<th>Summary</th>
<td>[ARM][NEON] Missing vXi64 popcnt lowering
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Backend: ARM
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>llvm-dev@redking.me.uk
</td>
</tr>
<tr>
<th>CC</th>
<td>efriedma@codeaurora.org, llvm-bugs@lists.llvm.org, sam.parker@arm.com, t.p.northover@gmail.com, tim.northover@arm.com
</td>
</tr>
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<th>Blocks</th>
<td>32655
</td>
</tr></table>
<p>
<div>
<pre>Discovered while adding CTPOP vector expansion support (PR32655), vXi8, vXi16
and vXi32 popcnt lowering is present but vXi64 is missing.
IIRC from the last time I touched a raspberry-pi, this should be achievable
with:
uint64x2_t a
vpaddlq_u32( vpaddlq_u16( vpaddlq_u8( vcntq_u8( vreinterpretq_u8_u64(a) ) ) )
)
Interestingly, the vXi16 and vXi32 lowerings don't use the PADDL instructions,
so there might be a reason I'm not aware of to avoid these?</pre>
</div>
</p>
<div id="referenced">
<hr style="border: 1px dashed #969696">
<b>Referenced Bugs:</b>
<ul>
<li>
[<a class="bz_bug_link
bz_status_NEW "
title="NEW - Improve generic vector CTPOP expansion"
href="https://bugs.llvm.org/show_bug.cgi?id=32655">Bug 32655</a>] Improve generic vector CTPOP expansion
</li>
</ul>
</div>
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