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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Assertion in DAGCombiner::visitCONCAT_VECTORS"
href="https://bugs.llvm.org/show_bug.cgi?id=32278">32278</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Assertion in DAGCombiner::visitCONCAT_VECTORS
</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>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>
<tr>
<th>Component</th>
<td>Common Code Generator Code
</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>
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<pre>Running llc on the following function (reproduces both on X86 and ARM):
define i8 @foo_v4i1_0_0_1_1_2_2_3_3(i8 %in) {
%trunc = trunc i8 %in to i4
%mask = bitcast i4 %trunc to <4 x i1>
%s = shufflevector <4 x i1> %mask, <4 x i1> undef, <8 x i32> <i32 0, i32 0,
i32 1, i32 1, i32 2, i32 2, i32 3, i32 3>
%b = bitcast <8 x i1> %s to i8
ret i8 %b
}
results in the following:
llc: llvm/lib/IR/Type.cpp:632: static llvm::VectorType
*llvm::VectorType::get(llvm::Type *, unsigned int): Assertion `NumElements > 0
&& "#Elements of a VectorType must be greater than 0"' failed.
Stack trace shows the assertion happened in DAGCombiner::visitCONCAT_VECTORS
#3 0x00007ffff67bf612 in __GI___assert_fail (assertion=0x3d09118 "NumElements
<span class="quote">> 0 && \"#Elements of a VectorType must be greater than 0\"", file=0x3d08af8</span >
"/users/zrackove/llvm/lib/IR/Type.cpp", line=632,
function=0x3d0915e "static llvm::VectorType
*llvm::VectorType::get(llvm::Type *, unsigned int)") at assert.c:101
#4 0x00000000024518dd in llvm::VectorType::get (ElementType=0x4f18b38,
NumElements=0) at /users/zrackove/llvm/lib/IR/Type.cpp:632
#5 0x0000000002464ddd in llvm::EVT::getExtendedVectorVT (Context=..., VT=...,
NumElements=0) at /users/zrackove/llvm/lib/IR/ValueTypes.cpp:43
#6 0x0000000000a3552c in llvm::EVT::getVectorVT (Context=..., VT=...,
NumElements=0) at ../include/llvm/CodeGen/ValueTypes.h:74
#7 0x0000000002821c71 in (anonymous
namespace)::DAGCombiner::visitCONCAT_VECTORS (this=0x7fffffffb628, N=0x4fd28a0)
at /users/zrackove/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp:14080
#8 0x00000000027e2614 in (anonymous namespace)::DAGCombiner::visit
(this=0x7fffffffb628, N=0x4fd28a0) at
/users/zrackove/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp:1477
#9 0x00000000027e199b in (anonymous namespace)::DAGCombiner::combine
(this=0x7fffffffb628, N=0x4fd28a0) at
/users/zrackove/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp:1493
#10 0x00000000027e0f47 in (anonymous namespace)::DAGCombiner::Run
(this=0x7fffffffb628, AtLevel=llvm::BeforeLegalizeTypes) at
/users/zrackove/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp:1345
#11 0x00000000027e0872 in llvm::SelectionDAG::Combine (this=0x4f51410,
Level=llvm::BeforeLegalizeTypes, AA=..., OptLevel=llvm::CodeGenOpt::Default) at
/users/zrackove/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp:16317
#12 0x00000000029ab9ec in llvm::SelectionDAGISel::CodeGenAndEmitDAG
(this=0x4f50f10) at
/users/zrackove/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:807
#13 0x00000000029ab3ef in llvm::SelectionDAGISel::SelectBasicBlock
(this=0x4f50f10, Begin=..., End=..., HadTailCall=@0x7fffffffc55d: false) at
/users/zrackove/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:727
#14 0x00000000029ab114 in llvm::SelectionDAGISel::SelectAllBasicBlocks
(this=0x4f50f10, Fn=...) at
/users/zrackove/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:1689
#15 0x00000000029a8dc9 in llvm::SelectionDAGISel::runOnMachineFunction
(this=0x4f50f10, mf=...) at
/users/zrackove/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:542
#16 0x0000000001853abb in (anonymous
namespace)::X86DAGToDAGISel::runOnMachineFunction (this=0x4f50f10, MF=...) at
/users/zrackove/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp:176</pre>
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