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<body><span class="vcard"><a class="email" href="mailto:llvm-dev@redking.me.uk" title="Simon Pilgrim <llvm-dev@redking.me.uk>"> <span class="fn">Simon Pilgrim</span></a>
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<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [X86][AVX512] suboptimal shuffle sequence instead of one vpermps instruction"
href="https://bugs.llvm.org/show_bug.cgi?id=34370">bug 34370</a>
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<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>FIXED
</td>
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<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [X86][AVX512] suboptimal shuffle sequence instead of one vpermps instruction"
href="https://bugs.llvm.org/show_bug.cgi?id=34370#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [X86][AVX512] suboptimal shuffle sequence instead of one vpermps instruction"
href="https://bugs.llvm.org/show_bug.cgi?id=34370">bug 34370</a>
from <span class="vcard"><a class="email" href="mailto:llvm-dev@redking.me.uk" title="Simon Pilgrim <llvm-dev@redking.me.uk>"> <span class="fn">Simon Pilgrim</span></a>
</span></b>
<pre>Current codegen combine the 2 shuffles AND the select into a single binary
shuffle:
vmovaps (%rdi), %ymm2
vmovaps {{.*#+}} ymm1 = [7,6,3,11,7,6,14,15]
vpermi2ps %ymm0, %ymm2, %ymm1
vmovaps %ymm1, %ymm0
retq
Added a test case at rL323106</pre>
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