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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 - shuffle (concat_vectors v4f64) hits assertion with AVX512"
href="https://bugs.llvm.org/show_bug.cgi?id=32371">32371</a>
</td>
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<th>Summary</th>
<td>shuffle (concat_vectors v4f64) hits assertion with AVX512
</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>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Backend: X86
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>zvi.rackover@intel.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Starting from r294774 the following test miscompiles:
llc -mcpu=skx
define <8 x double> @foo2(<4 x double> %v) {
%res = shufflevector <4 x double> %v, <4 x double> undef, <8 x i32>
<i32 2, i32 2, i32 2, i32 2, i32 2, i32 2, i32 2, i32 2>
ret <8 x double> %res
}
llvm/lib/Target/X86/X86ISelLowering.cpp:9919: llvm::SDValue
lowerVectorShuffleAsBroadcast(const llvm::SDLoc &, llvm::MVT, llvm::SDValue,
llvm::SDValue, ArrayRef<int>, const llvm::X86Subtarget &, llvm::SelectionDAG
&): Assertion `SrcVT.getVectorNumElements() ==
BroadcastVT.getVectorNumElements() && "Unexpected vector num elements"' failed.
Here's the DAG at the time the assert fires:
SelectionDAG has 11 nodes:
t0: ch = EntryToken
t2: v4f64,ch = CopyFromReg t0, Register:v4f64 %vreg0
t4: v8f64 = concat_vectors t2, undef:v4f64
t6: v8f64 = vector_shuffle<2,2,2,2,2,2,2,2> t4, undef:v8f64
t9: ch,glue = CopyToReg t0, Register:v8f64 %ZMM0, t6
t10: ch = X86ISD::RET_FLAG t9, TargetConstant:i32<0>, Register:v8f64 %ZMM0,
t9:1</pre>
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