Created attachment 20535 [details] Reduced test case The attached test case causes an assertion failure when compiled with: llc -march=ppc64 -mcpu=pwr9 But compiles fine with llc -march=ppc64 Here is the backtrace from the assertion failure: llc: /home/tstellar/llvm-project/llvm/include/llvm/ADT/SmallVector.h:150: reference llvm::SmallVectorTemplateCommon<int, void>::operator[](size_type) [T = int]: Assertion `idx < size()' failed. Stack dump: 0. Program arguments: ../llvm-build/bin/llc -march=ppc64 -mcpu=pwr9 1. Running pass 'Function Pass Manager' on module '<stdin>'. 2. Running pass 'PowerPC DAG->DAG Pattern Instruction Selection' on function '@draw_llvm_vs_variant0' #0 0x00007fc65dc1b514 PrintStackTraceSignalHandler(void*) (llvm-build/bin/../lib/libLLVM-7svn.so+0x935514) #1 0x00007fc65dc19810 llvm::sys::RunSignalHandlers() (llvm-build/bin/../lib/libLLVM-7svn.so+0x933810) #2 0x00007fc65dc1b6c2 SignalHandler(int) (llvm-build/bin/../lib/libLLVM-7svn.so+0x9356c2) #3 0x00007fc65d0d9370 __restore_rt (/lib64/libpthread.so.0+0xf370) #4 0x00007fc65c51e1d7 __GI_raise (/lib64/libc.so.6+0x351d7) #5 0x00007fc65c51f8c8 __GI_abort (/lib64/libc.so.6+0x368c8) #6 0x00007fc65c517146 __assert_fail_base (/lib64/libc.so.6+0x2e146) #7 0x00007fc65c5171f2 (/lib64/libc.so.6+0x2e1f2) #8 0x00007fc65f8455dc llvm::PPCTargetLowering::DAGCombineBuildVector(llvm::SDNode*, llvm::TargetLowering::DAGCombinerInfo&) const (lvm-build/bin/../lib/libLLVM-7svn.so+0x255f5dc) #9 0x00007fc65f8476c5 llvm::PPCTargetLowering::PerformDAGCombine(llvm::SDNode*, llvm::TargetLowering::DAGCombinerInfo&) const (llvm-build/bin/../lib/libLLVM-7svn.so+0x25616c5) #10 0x00007fc65e111681 (anonymous namespace)::DAGCombiner::combine(llvm::SDNode*) (llvm-build/bin/../lib/libLLVM-7svn.so+0xe2b681) #11 0x00007fc65e1103bf llvm::SelectionDAG::Combine(llvm::CombineLevel, llvm::AAResults*, llvm::CodeGenOpt::Level) (llvm-build/bin/../lib/libLLVM-7svn.so+0xe2a3bf) #12 0x00007fc65e2ef5f5 llvm::SelectionDAGISel::CodeGenAndEmitDAG() (llvm-build/bin/../lib/libLLVM-7svn.so+0x10095f5) #13 0x00007fc65e2edb92 llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) (llvm-build/bin/../lib/libLLVM-7svn.so+0x1007b92) #14 0x00007fc65e2e9d59 llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) (llvm-build/bin/../lib/libLLVM-7svn.so+0x1003d59) #15 0x00007fc65f7e3412 (anonymous namespace)::PPCDAGToDAGISel::runOnMachineFunction(llvm::MachineFunction&) (llvm-build/bin/../lib/libLLVM-7svn.so+0x24fd412) #16 0x00007fc65df27834 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (llvm-build/bin/../lib/libLLVM-7svn.so+0xc41834) #17 0x00007fc65dd4f217 llvm::FPPassManager::runOnFunction(llvm::Function&) (llvm-build/bin/../lib/libLLVM-7svn.so+0xa69217) #18 0x00007fc65dd4f473 llvm::FPPassManager::runOnModule(llvm::Module&) (llvm-build/bin/../lib/libLLVM-7svn.so+0xa69473) #19 0x00007fc65dd4f97b llvm::legacy::PassManagerImpl::run(llvm::Module&) (llvm-build/bin/../lib/libLLVM-7svn.so+0xa6997b) #20 0x0000000000412a34 compileModule(char**, llvm::LLVMContext&) (../llvm-build/bin/llc+0x412a34) #21 0x000000000041000d main (../llvm-build/bin/llc+0x41000d) #22 0x00007fc65c50ab35 __libc_start_main (/lib64/libc.so.6+0x21b35) #23 0x000000000040ee0a _start (../llvm-build/bin/llc+0x40ee0a)
I'll have a look.
Fix in https://reviews.llvm.org/D49080
(In reply to Nemanja Ivanovic from comment #2) > Fix in https://reviews.llvm.org/D49080 That landed in r339769 and I merged it to 7.0 in r339859.