[RISCV] Assertion `Iter != this->end() && "DenseMap::at failed due to a missing key"' failed. #168665
Description
https://godbolt.org/z/ojcT5x3n3
bisect to 65ad21d
assertion message as below
llc: /root/llvm-project/llvm/include/llvm/ADT/DenseMap.h:226: const ValueT& llvm::DenseMapBase<DerivedT, KeyT, ValueT, KeyInfoT, BucketT>::at(llvm::DenseMapBase<DerivedT, KeyT, ValueT, KeyInfoT, BucketT>::const_arg_type_t<KeyT>) const [with DerivedT = llvm::DenseMap<const llvm::MachineInstr*, {anonymous}::DemandedVL>; KeyT = const llvm::MachineInstr*; ValueT = {anonymous}::DemandedVL; KeyInfoT = llvm::DenseMapInfo<const llvm::MachineInstr*, void>; BucketT = llvm::detail::DenseMapPair<const llvm::MachineInstr*, {anonymous}::DemandedVL>; llvm::DenseMapBase<DerivedT, KeyT, ValueT, KeyInfoT, BucketT>::const_arg_type_t<KeyT> = const llvm::MachineInstr*]: Assertion `Iter != this->end() && "DenseMap::at failed due to a missing key"' failed.
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace and instructions to reproduce the bug.
Stack dump:
0. Program arguments: /opt/compiler-explorer/clang-assertions-trunk/bin/llc -o /app/output.s -x86-asm-syntax=intel -mattr=+v -O2 <source>
1. Running pass 'Function Pass Manager' on module '<source>'.
2. Running pass 'RISC-V VL Optimizer' on function '@main'
#0 0x00000000041a29e8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0x41a29e8)
#1 0x000000000419f894 SignalHandler(int, siginfo_t*, void*) Signals.cpp:0:0
#2 0x0000785c70242520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#3 0x0000785c702969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
#4 0x0000785c70242476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
#5 0x0000785c702287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
#6 0x0000785c7022871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
#7 0x0000785c70239e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
#8 0x0000000001d42be3 (anonymous namespace)::RISCVVLOptimizer::runOnMachineFunction(llvm::MachineFunction&) (.part.0) RISCVVLOptimizer.cpp:0:0
#9 0x0000000003090789 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (.part.0) MachineFunctionPass.cpp:0:0
#10 0x00000000036da9c6 llvm::FPPassManager::runOnFunction(llvm::Function&) (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0x36da9c6)
#11 0x00000000036dad71 llvm::FPPassManager::runOnModule(llvm::Module&) (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0x36dad71)
#12 0x00000000036db5df llvm::legacy::PassManagerImpl::run(llvm::Module&) (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0x36db5df)
#13 0x00000000008f821f compileModule(char**, llvm::LLVMContext&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>&) llc.cpp:0:0
#14 0x00000000007c5db9 main (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0x7c5db9)
#15 0x0000785c70229d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#16 0x0000785c70229e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#17 0x00000000008ed4c5 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0x8ed4c5)
Program terminated with signal: SIGSEGV
Compiler returned: 139