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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Missed opportunity for vpadd"
href="https://bugs.llvm.org/show_bug.cgi?id=42607">42607</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Missed opportunity for vpadd
</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>
<tr>
<th>OS</th>
<td>Linux
</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>
</tr>
<tr>
<th>Component</th>
<td>Backend: X86
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>david.bolvansky@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>craig.topper@gmail.com, llvm-bugs@lists.llvm.org, llvm-dev@redking.me.uk, spatel+llvm@rotateright.com
</td>
</tr></table>
<p>
<div>
<pre>typedef unsigned long long v64u64 __attribute__((vector_size(64)));
typedef unsigned __int128 v64u128 __attribute__((vector_size(64)));
v64u64 foo(v64u64 a, v64u128 b) { return a + (v64u64)b; }
-O3 -mavx512vbmi -march=skylake
Clang:
foo: # @foo
vmovq xmm1, rcx
vmovq xmm2, rdx
vpunpcklqdq xmm1, xmm2, xmm1 # xmm1 = xmm2[0],xmm1[0]
vmovq xmm2, rsi
vmovq xmm3, rdi
vpunpcklqdq xmm2, xmm3, xmm2 # xmm2 = xmm3[0],xmm2[0]
vinserti128 ymm1, ymm2, xmm1, 1
vmovq xmm2, r9
vmovq xmm3, r8
vpunpcklqdq xmm2, xmm3, xmm2 # xmm2 = xmm3[0],xmm2[0]
vinserti128 ymm2, ymm2, xmmword ptr [rsp + 8], 1
vinserti64x4 zmm1, zmm1, ymm2, 1
vpaddq zmm0, zmm1, zmm0
ret
GCC:
foo:
vpaddq zmm0, zmm0, ZMMWORD PTR [rsp+8]
ret</pre>
</div>
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