[llvm-bugs] [Bug 34947] New: -O0 crash: assertion "Cannot BITCAST between types of different sizes!"

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=34947

            Bug ID: 34947
           Summary: -O0 crash: assertion "Cannot BITCAST between types of
                    different sizes!"
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: babokin at gmail.com
                CC: llvm-bugs at lists.llvm.org

clang trunk, rev315788, x86_64.

> cat f.cpp
typedef unsigned a __attribute__((ext_vector_type(9)));
a b = 2149580799 % 262143 * (0 % b);

> clang++ -c f.cpp -w
clang-6.0:
/home/dybaboki/llvm/llvm-trunk-20171013/lib/CodeGen/SelectionDAG/SelectionDAG.cpp:3822:
llvm::SDValue llvm::SelectionDAG::getNode(unsigned int, const llvm::SDLoc &,
llvm::EVT, llvm::SDValue, const llvm::SDNodeFlags): Assertion
`VT.getSizeInBits() == Operand.get
ValueSizeInBits() && "Cannot BITCAST between types of different sizes!"'
failed.
#0 0x000000000137e1ef llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/home/dybaboki/llvm/bin-trunk-20171013/bin/clang-6.0+0x137e1ef)
#1 0x000000000137e4f6 SignalHandler(int)
(/home/dybaboki/llvm/bin-trunk-20171013/bin/clang-6.0+0x137e4f6)
#2 0x00007f92b5e18370 __restore_rt (/lib64/libpthread.so.0+0xf370)
#3 0x00007f92b49941d7 __GI_raise (/lib64/libc.so.6+0x351d7)
#4 0x00007f92b49958c8 __GI_abort (/lib64/libc.so.6+0x368c8)
#5 0x00007f92b498d146 __assert_fail_base (/lib64/libc.so.6+0x2e146)
#6 0x00007f92b498d1f2 (/lib64/libc.so.6+0x2e1f2)
#7 0x0000000001ad09c3 llvm::SelectionDAG::getNode(unsigned int, llvm::SDLoc
const&, llvm::EVT, llvm::SDValue, llvm::SDNodeFlags)
(/home/dybaboki/llvm/bin-trunk-20171013/bin/clang-6.0+0x1ad09c3)
#8 0x00000000008d3e37 llvm::X86TargetLowering::PerformDAGCombine(llvm::SDNode*,
llvm::TargetLowering::DAGCombinerInfo&) const
(/home/dybaboki/llvm/bin-trunk-20171013/bin/clang-6.0+0x8d3e37)
#9 0x00000000019d6074 (anonymous
namespace)::DAGCombiner::combine(llvm::SDNode*)
(/home/dybaboki/llvm/bin-trunk-20171013/bin/clang-6.0+0x19d6074)
#10 0x00000000019d4ccf llvm::SelectionDAG::Combine(llvm::CombineLevel,
llvm::AAResults*, llvm::CodeGenOpt::Level)
(/home/dybaboki/llvm/bin-trunk-20171013/bin/clang-6.0+0x19d4ccf)
#11 0x0000000001b0d66a llvm::SelectionDAGISel::CodeGenAndEmitDAG()
(/home/dybaboki/llvm/bin-trunk-20171013/bin/clang-6.0+0x1b0d66a)
#12 0x0000000001b0bc0c
llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&)
(/home/dybaboki/llvm/bin-trunk-20171013/bin/clang-6.0+0x1b0bc0c)
#13 0x0000000001b084b4
llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&)
(/home/dybaboki/llvm/bin-trunk-20171013/bin/clang-6.0+0x1b084b4)
#14 0x000000000083ce81 (anonymous
namespace)::X86DAGToDAGISel::runOnMachineFunction(llvm::MachineFunction&)
(/home/dybaboki/llvm/bin-trunk-20171013/bin/clang-6.0+0x83ce81)
#15 0x0000000000bf4938
llvm::MachineFunctionPass::runOnFunction(llvm::Function&)
(/home/dybaboki/llvm/bin-trunk-20171013/bin/clang-6.0+0xbf4938)
#16 0x0000000000f0d9af llvm::FPPassManager::runOnFunction(llvm::Function&)
(/home/dybaboki/llvm/bin-trunk-20171013/bin/clang-6.0+0xf0d9af)
#17 0x0000000000f0dc73 llvm::FPPassManager::runOnModule(llvm::Module&)
(/home/dybaboki/llvm/bin-trunk-20171013/bin/clang-6.0+0xf0dc73)
<...>

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