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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - "Assertion `NewC && "Constant folding failed"' failed." with SVE"
href="https://bugs.llvm.org/show_bug.cgi?id=49781">49781</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>"Assertion `NewC && "Constant folding failed"' failed." with SVE
</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>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Backend: AArch64
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>efriedma@quicinc.com
</td>
</tr>
<tr>
<th>CC</th>
<td>arnaud.degrandmaison@arm.com, llvm-bugs@lists.llvm.org, smithp352@googlemail.com, Ties.Stuij@arm.com
</td>
</tr></table>
<p>
<div>
<pre>Testcase:
define <vscale x 2 x i64> @foo(<vscale x 2 x i64> %a) {
%idx = shufflevector <vscale x 2 x i64> insertelement (<vscale x 2 x i64>
undef, i64 1, i32 0), <vscale x 2 x i64> zeroinitializer, <vscale x 2 x i32>
zeroinitializer
%b = sub <vscale x 2 x i64> %a, %idx
%c = sub <vscale x 2 x i64> %b, %idx
ret <vscale x 2 x i64> %c
}
With "llc -mtriple=aarch64 -mattr=+sve":
llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp:3335: llvm::SDValue (anonymous
namespace)::DAGCombiner::visitSUB(llvm::SDNode *): Assertion `NewC && "Constant
folding failed"' failed.
PLEASE submit a bug report to <a href="https://bugs.llvm.org/">https://bugs.llvm.org/</a> and include the crash
backtrace.
Stack dump:
0. Program arguments: bin/llc -mtriple=aarch64 -mattr=+sve
1. Running pass 'Function Pass Manager' on module '<stdin>'.
2. Running pass 'AArch64 Instruction Selection' on function '@foo'
#0 0x0000000004c81c03 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int)
(bin/llc+0x4c81c03)
#1 0x0000000004c7f7ce llvm::sys::RunSignalHandlers() (bin/llc+0x4c7f7ce)
#2 0x0000000004c820d6 SignalHandler(int) Signals.cpp:0:0
#3 0x00007faebbb7a390 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x11390)
#4 0x00007faeba564438 raise
/build/glibc-e6zv40/glibc-2.23/signal/../sysdeps/unix/sysv/linux/raise.c:54:0
#5 0x00007faeba56603a abort /build/glibc-e6zv40/glibc-2.23/stdlib/abort.c:91:0
#6 0x00007faeba55cbe7 __assert_fail_base
/build/glibc-e6zv40/glibc-2.23/assert/assert.c:92:0
#7 0x00007faeba55cc92 (/lib/x86_64-linux-gnu/libc.so.6+0x2dc92)
#8 0x00000000049291f4 (anonymous
namespace)::DAGCombiner::visitSUB(llvm::SDNode*) DAGCombiner.cpp:0:0
#9 0x00000000048f8691 (anonymous namespace)::DAGCombiner::visit(llvm::SDNode*)
DAGCombiner.cpp:0:0
#10 0x00000000048f3f31 (anonymous
namespace)::DAGCombiner::combine(llvm::SDNode*) DAGCombiner.cpp:0:0
#11 0x00000000048f1254 llvm::SelectionDAG::Combine(llvm::CombineLevel,
llvm::AAResults*, llvm::CodeGenOpt::Level) (bin/llc+0x48f1254)
#12 0x0000000004ab258f llvm::SelectionDAGISel::CodeGenAndEmitDAG()
(bin/llc+0x4ab258f)
#13 0x0000000004ab15b1
llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&)
(bin/llc+0x4ab15b1)
#14 0x0000000004aadc06
llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&)
(bin/llc+0x4aadc06)
#15 0x0000000003ff8b2a
llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (bin/llc+0x3ff8b2a)
#16 0x00000000044353c2 llvm::FPPassManager::runOnFunction(llvm::Function&)
(bin/llc+0x44353c2)
#17 0x000000000443c1f8 llvm::FPPassManager::runOnModule(llvm::Module&)
(bin/llc+0x443c1f8)
#18 0x0000000004435a6e llvm::legacy::PassManagerImpl::run(llvm::Module&)
(bin/llc+0x4435a6e)
#19 0x00000000029f3b00 main (bin/llc+0x29f3b00)
#20 0x00007faeba54f840 __libc_start_main
/build/glibc-e6zv40/glibc-2.23/csu/../csu/libc-start.c:325:0
#21 0x00000000029f1029 _start (bin/llc+0x29f1029)
Aborted</pre>
</div>
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