[llvm-bugs] [Bug 29059] New: Assert in llvm::SelectionDAG::Legalize()

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=29059

            Bug ID: 29059
           Summary: Assert in llvm::SelectionDAG::Legalize()
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: babokin at gmail.com
                CC: llvm-bugs at lists.llvm.org, Vsevolod.Livinskij at frtk.ru
    Classification: Unclassified

Created attachment 17005
  --> https://llvm.org/bugs/attachment.cgi?id=17005&action=edit
reproducer

Fresh trunk fails with an assert in llvm::SelectionDAG::Legalize()

The source contains several warnings, but this is all legal C++.

> clang --version
clang version 4.0.0 (trunk 279250)
Target: x86_64-unknown-linux-gnu
Thread model: posix

> clang++ -c pr.cpp -O2 -w
clang-4.0:
/export/users/dybaboki/llvm/llvm-trunk/include/llvm/CodeGen/SelectionDAGNodes.h:666:
const llvm::SDValue &llvm::SDNode::getOperand(unsigned int) const: Assertion
`Num < NumOperands && "Invalid child # of SDNode!"' failed.
#0 0x0000000001143335 llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/export/users/dybaboki/llvm/bin-trunk/bin/clang-4.0+0x1143335)
#1 0x0000000001143a06 SignalHandler(int)
(/export/users/dybaboki/llvm/bin-trunk/bin/clang-4.0+0x1143a06)
#2 0x00007f1b7df61100 __restore_rt (/lib64/libpthread.so.0+0xf100)
#3 0x00007f1b7cb595f7 __GI_raise (/lib64/libc.so.6+0x355f7)
#4 0x00007f1b7cb5ace8 __GI_abort (/lib64/libc.so.6+0x36ce8)
#5 0x00007f1b7cb52566 __assert_fail_base (/lib64/libc.so.6+0x2e566)
#6 0x00007f1b7cb52612 (/lib64/libc.so.6+0x2e612)
#7 0x0000000001823076 (anonymous
namespace)::SelectionDAGLegalize::LegalizeOp(llvm::SDNode*)
(/export/users/dybaboki/llvm/bin-trunk/bin/clang-4.0+0x1823076)
#8 0x00000000018209c6 llvm::SelectionDAG::Legalize()
(/export/users/dybaboki/llvm/bin-trunk/bin/clang-4.0+0x18209c6)
#9 0x00000000018d1039 llvm::SelectionDAGISel::CodeGenAndEmitDAG()
(/export/users/dybaboki/llvm/bin-trunk/bin/clang-4.0+0x18d1039)
#10 0x00000000018cfc41
llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&)
(/export/users/dybaboki/llvm/bin-trunk/bin/clang-4.0+0x18cfc41)
#11 0x00000000018cb5cd
llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&)
(/export/users/dybaboki/llvm/bin-trunk/bin/clang-4.0+0x18cb5cd)
#12 0x0000000000782271 (anonymous
namespace)::X86DAGToDAGISel::runOnMachineFunction(llvm::MachineFunction&)
(/export/users/dybaboki/llvm/bin-trunk/bin/clang-4.0+0x782271)
#13 0x0000000000ab36e6
llvm::MachineFunctionPass::runOnFunction(llvm::Function&)
(/export/users/dybaboki/llvm/bin-trunk/bin/clang-4.0+0xab36e6)
#14 0x0000000000d5e84f llvm::FPPassManager::runOnFunction(llvm::Function&)
(/export/users/dybaboki/llvm/bin-trunk/bin/clang-4.0+0xd5e84f)
#15 0x0000000000d5ea9b llvm::FPPassManager::runOnModule(llvm::Module&)
(/export/users/dybaboki/llvm/bin-trunk/bin/clang-4.0+0xd5ea9b)
#16 0x0000000000d5ef85 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/export/users/dybaboki/llvm/bin-trunk/bin/clang-4.0+0xd5ef85)
#17 0x00000000012c4204 clang::EmitBackendOutput(clang::DiagnosticsEngine&,
clang::CodeGenOptions const&, clang::TargetOptions const&, clang::LangOptions
const&, llvm::DataLayout const&, llvm::Module*, clang::BackendAction,
std::unique_ptr<llvm::raw_pwrite_stream,
std::default_delete<llvm::raw_pwrite_stream> >)
(/export/users/dybaboki/llvm/bin-trunk/bin/clang-4.0+0x12c4204)
#18 0x0000000001999bfc
clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&)
(/export/users/dybaboki/llvm/bin-trunk/bin/clang-4.0+0x1999bfc)
#19 0x0000000001da2c66 clang::ParseAST(clang::Sema&, bool, bool)
(/export/users/dybaboki/llvm/bin-trunk/bin/clang-4.0+0x1da2c66)
#20 0x0000000001682635 clang::FrontendAction::Execute()
(/export/users/dybaboki/llvm/bin-trunk/bin/clang-4.0+0x1682635)
#21 0x000000000164b1e1
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/export/users/dybaboki/llvm/bin-trunk/bin/clang-4.0+0x164b1e1)
#22 0x000000000171653a
clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/export/users/dybaboki/llvm/bin-trunk/bin/clang-4.0+0x171653a)
#23 0x00000000006d63a3 cc1_main(llvm::ArrayRef<char const*>, char const*,
void*) (/export/users/dybaboki/llvm/bin-trunk/bin/clang-4.0+0x6d63a3)
#24 0x00000000006d48b9 main
(/export/users/dybaboki/llvm/bin-trunk/bin/clang-4.0+0x6d48b9)
#25 0x00007f1b7cb45b15 __libc_start_main (/lib64/libc.so.6+0x21b15)
#26 0x00000000006d1dc5 _start
(/export/users/dybaboki/llvm/bin-trunk/bin/clang-4.0+0x6d1dc5)

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