[llvm-bugs] [Bug 42909] New: X86ISelLowering.cpp:7692: llvm::SDValue EltsFromConsecutiveLoads(...): Assertion `EltBaseVT.getSizeInBits() == EltBaseVT.getStoreSizeInBits() && "Register/Memory size mismatch"' failed.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42909

            Bug ID: 42909
           Summary: X86ISelLowering.cpp:7692: llvm::SDValue
                    EltsFromConsecutiveLoads(...): Assertion
                    `EltBaseVT.getSizeInBits() ==
                    EltBaseVT.getStoreSizeInBits() && "Register/Memory
                    size mismatch"' failed.
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: bjorn.a.pettersson at ericsson.com
                CC: craig.topper at gmail.com, llvm-bugs at lists.llvm.org,
                    llvm-dev at redking.me.uk, spatel+llvm at rotateright.com

Created attachment 22348
  --> https://bugs.llvm.org/attachment.cgi?id=22348&action=edit
Test case as generated by llvm-stress

An assertion has started to show up (probably after turning on
x86-experimental-vector-widening-legalization by default since it disappears
when disabling it).

When running

  llc -march=x86-64 -mcpu=corei7 -o - stress-300-31033.ll
-x86-experimental-vector-widening-legalization=1

we get

...
Combining: t137: v4i1 = vector_shuffle<u,1,5,u> t129, t176
llc: ../lib/Target/X86/X86ISelLowering.cpp:7692: llvm::SDValue
EltsFromConsecutiveLoads(llvm::EVT, ArrayRef<llvm::SDValue>, const llvm::SDLoc
&, llvm::SelectionDAG &, const llvm::X86Subtarget &, bool): Assertion
`EltBaseVT.getSizeInBits() == EltBaseVT.getStoreSizeInBits() &&
"Register/Memory size mismatch"' failed.
Stack dump:
0.      Program arguments: bin/llc -march=x86-64 -mcpu=corei7 -o -
stress-300-31033.ll -x86-experimental-vector-widening-legalization=1 -debug 
1.      Running pass 'Function Pass Manager' on module 'stress-300-31033.ll'.
2.      Running pass 'X86 DAG->DAG Instruction Selection' on function
'@autogen_SD31033'
 #0 0x0000000002345d94 PrintStackTraceSignalHandler(void*) (bin/llc+0x2345d94)
 #1 0x0000000002343a7e llvm::sys::RunSignalHandlers() (bin/llc+0x2343a7e)
 #2 0x0000000002346198 SignalHandler(int) (bin/llc+0x2346198)
 #3 0x0000003ba280f7e0 __restore_rt (/lib64/libpthread.so.0+0x3ba280f7e0)
 #4 0x0000003ba24324f5 raise (/lib64/libc.so.6+0x3ba24324f5)
 #5 0x0000003ba2433cd5 abort (/lib64/libc.so.6+0x3ba2433cd5)
 #6 0x0000003ba242b66e __assert_fail_base (/lib64/libc.so.6+0x3ba242b66e)
 #7 0x0000003ba242b730 __assert_perror_fail (/lib64/libc.so.6+0x3ba242b730)
 #8 0x000000000124b01c EltsFromConsecutiveLoads(llvm::EVT,
llvm::ArrayRef<llvm::SDValue>, llvm::SDLoc const&, llvm::SelectionDAG&,
llvm::X86Subtarget const&, bool) (bin/llc+0x124b01c)
 #9 0x00000000012ef06e combineShuffle(llvm::SDNode*, llvm::SelectionDAG&,
llvm::TargetLowering::DAGCombinerInfo&, llvm::X86Subtarget const&)
(bin/llc+0x12ef06e)
#10 0x00000000012b8541
llvm::X86TargetLowering::PerformDAGCombine(llvm::SDNode*,
llvm::TargetLowering::DAGCombinerInfo&) const (bin/llc+0x12b8541)
#11 0x000000000204008f (anonymous
namespace)::DAGCombiner::combine(llvm::SDNode*) (bin/llc+0x204008f)
#12 0x000000000203dbd4 llvm::SelectionDAG::Combine(llvm::CombineLevel,
llvm::AAResults*, llvm::CodeGenOpt::Level) (bin/llc+0x203dbd4)
#13 0x00000000021c6c18 llvm::SelectionDAGISel::CodeGenAndEmitDAG()
(bin/llc+0x21c6c18)
#14 0x00000000021c5c3c
llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&)
(bin/llc+0x21c5c3c)
#15 0x00000000021c25d6
llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&)
(bin/llc+0x21c25d6)
#16 0x0000000001210b56 (anonymous
namespace)::X86DAGToDAGISel::runOnMachineFunction(llvm::MachineFunction&)
(bin/llc+0x1210b56)
#17 0x000000000197d7c9
llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (bin/llc+0x197d7c9)
#18 0x0000000001cec403 llvm::FPPassManager::runOnFunction(llvm::Function&)
(bin/llc+0x1cec403)
#19 0x0000000001cec713 llvm::FPPassManager::runOnModule(llvm::Module&)
(bin/llc+0x1cec713)
#20 0x0000000001cecd7d llvm::legacy::PassManagerImpl::run(llvm::Module&)
(bin/llc+0x1cecd7d)
#21 0x0000000000788eae compileModule(char**, llvm::LLVMContext&)
(bin/llc+0x788eae)
#22 0x000000000078660d main (bin/llc+0x78660d)
#23 0x0000003ba241ed20 __libc_start_main (/lib64/libc.so.6+0x3ba241ed20)
#24 0x00000000007842a9 _start (bin/llc+0x7842a9)
Abort (core dumped)

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