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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [AVX512] lowerV4X128VectorShuffle doesn't correctly select input operands"
href="https://llvm.org/bugs/show_bug.cgi?id=26914">26914</a>
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<th>Summary</th>
<td>[AVX512] lowerV4X128VectorShuffle doesn't correctly select input operands
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Backend: X86
</td>
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<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>elena.demikhovsky@intel.com, igor.breger@intel.com, llvm-bugs@lists.llvm.org
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</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>define <8 x double> @shuffle_v8f64_23014567(<8 x double> %a0, <8 x double> %a1)
{
%1 = shufflevector <8 x double> %a1, <8 x double> undef, <8 x i32> <i32 2,
i32 3, i32 0, i32 1, i32 4, i32 5, i32 6, i32 7>
ret <8 x double> %1
}
Gives:
vshuff64x2 $225, %zmm0, %zmm1, %zmm0 # zmm0 = zmm1[2,3,0,1],zmm0[4,5,6,7]
retq
I'd expect:
vshuff64x2 $225, %zmm1, %zmm1, %zmm0 # zmm0 = zmm1[2,3,0,1,4,5,6,7]
retq
Found whilst investigating adding X86ISD::SHUF128 to the target shuffle combine
list.</pre>
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