% cat a.c long a, b, e, g; int c; short d; int *f; int h() {  long i; j:  if (e) {  int k;  g = b && -1 / a;  k = *f;  if (k) {  i |= 0 <= 0;  if (c)  goto j;  } else {  d = 0;  return 0;  }  } else {  int l;  for (; d;) {  e = 9166129423;  goto j;  }  return *f;  }  return 0; } int main() {} % % clang -O1 a.c clang-14: /tmp/tmp3wrk7acr/tmpxyxr54it/llvm/include/llvm/CodeGen/MachineOperand.h:361: llvm::Register llvm::MachineOperand::getReg() const: Assertion `isReg() && "This is not a register operand!"' failed. PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash backtrace, preprocessed source, and associated run script. Stack dump: 0. Program arguments: /zdata/shaoli/compilers/ccbuilder-compilers/clang-2cdc6f2ca62e83fec445114fbbe6276e9ab2a7d0/bin/clang-14 -cc1 -triple x86_64-unknown-linux-gnu -emit-obj --mrelax-relocations -disable-free -clear-ast-before-backend -main-file-name reduced.c -mrelocation-model static -mframe-pointer=none -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/zdata/shaoli/realsmith/watchdir/reduced/case_7TTZKO7D -resource-dir /zdata/shaoli/compilers/ccbuilder-compilers/clang-2cdc6f2ca62e83fec445114fbbe6276e9ab2a7d0/lib/clang/14.0.0 -internal-isystem /zdata/shaoli/compilers/ccbuilder-compilers/clang-2cdc6f2ca62e83fec445114fbbe6276e9ab2a7d0/lib/clang/14.0.0/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/11/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O1 -fdebug-compilation-dir=/zdata/shaoli/realsmith/watchdir/reduced/case_7TTZKO7D -ferror-limit 19 -fgnuc-version=4.2.1 -fcolor-diagnostics -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/reduced-b68b25.o -x c a.c 1. <eof> parser at end of file 2. Code generation 3. Running pass 'Function Pass Manager' on module 'a.c'. 4. Running pass 'Simple Register Coalescing' on function '@h'  #0 0x00007fd79170c704 PrintStackTraceSignalHandler(void*) Signals.cpp:0:0  #1 0x00007fd791709e2e SignalHandler(int) Signals.cpp:0:0  #2 0x00007fd790ae8090 (/lib/x86_64-linux-gnu/libc.so.6+0x43090)  #3 0x00007fd790ae800b raise /build/glibc-BHL3KM/glibc-2.31/signal/../sysdeps/unix/sysv/linux/raise.c:51:1  #4 0x00007fd790ac7859 abort /build/glibc-BHL3KM/glibc-2.31/stdlib/abort.c:81:7  #5 0x00007fd790ac7729 get_sysdep_segment_value /build/glibc-BHL3KM/glibc-2.31/intl/loadmsgcat.c:509:8  #6 0x00007fd790ac7729 _nl_load_domain /build/glibc-BHL3KM/glibc-2.31/intl/loadmsgcat.c:970:34  #7 0x00007fd790ad8fd6 (/lib/x86_64-linux-gnu/libc.so.6+0x33fd6)  #8 0x00007fd791d8fadd isMoveInstr(llvm::TargetRegisterInfo const&, llvm::MachineInstr const*, llvm::Register&, llvm::Register&, unsigned int&, unsigned int&) (.constprop.0) RegisterCoalescer.cpp:0:0  #9 0x00007fd791d95ada llvm::CoalescerPair::setRegisters(llvm::MachineInstr const*) (/zdata/shaoli/compilers/ccbuilder-compilers/clang-2cdc6f2ca62e83fec445114fbbe6276e9ab2a7d0/bin/../lib/libLLVM-14git.so+0xec2ada) #10 0x00007fd791da10ac (anonymous namespace)::RegisterCoalescer::joinCopy(llvm::MachineInstr*, bool&) (.constprop.0) RegisterCoalescer.cpp:0:0 #11 0x00007fd791da38cf (anonymous namespace)::RegisterCoalescer::copyCoalesceWorkList(llvm::MutableArrayRef<llvm::MachineInstr*>) RegisterCoalescer.cpp:0:0 #12 0x00007fd791da70d5 (anonymous namespace)::RegisterCoalescer::runOnMachineFunction(llvm::MachineFunction&) RegisterCoalescer.cpp:0:0 #13 0x00007fd791bb2a38 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (/zdata/shaoli/compilers/ccbuilder-compilers/clang-2cdc6f2ca62e83fec445114fbbe6276e9ab2a7d0/bin/../lib/libLLVM-14git.so+0xcdfa38) #14 0x00007fd7918a12c5 llvm::FPPassManager::runOnFunction(llvm::Function&) (/zdata/shaoli/compilers/ccbuilder-compilers/clang-2cdc6f2ca62e83fec445114fbbe6276e9ab2a7d0/bin/../lib/libLLVM-14git.so+0x9ce2c5) #15 0x00007fd7918a1509 llvm::FPPassManager::runOnModule(llvm::Module&) (/zdata/shaoli/compilers/ccbuilder-compilers/clang-2cdc6f2ca62e83fec445114fbbe6276e9ab2a7d0/bin/../lib/libLLVM-14git.so+0x9ce509) #16 0x00007fd7918a25f2 llvm::legacy::PassManagerImpl::run(llvm::Module&) (/zdata/shaoli/compilers/ccbuilder-compilers/clang-2cdc6f2ca62e83fec445114fbbe6276e9ab2a7d0/bin/../lib/libLLVM-14git.so+0x9cf5f2) #17 0x00007fd7970948a3 clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::HeaderSearchOptions const&, clang::CodeGenOptions const&, clang::TargetOptions const&, clang::LangOptions const&, llvm::StringRef, llvm::Module*, clang::BackendAction, std::unique_ptr<llvm::raw_pwrite_stream, std::default_delete<llvm::raw_pwrite_stream> >) (/zdata/shaoli/compilers/ccbuilder-compilers/clang-2cdc6f2ca62e83fec445114fbbe6276e9ab2a7d0/bin/../lib/libclang-cpp.so.14git+0x1bef8a3) #18 0x00007fd797472353 clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) (/zdata/shaoli/compilers/ccbuilder-compilers/clang-2cdc6f2ca62e83fec445114fbbe6276e9ab2a7d0/bin/../lib/libclang-cpp.so.14git+0x1fcd353) #19 0x00007fd795e300d9 clang::ParseAST(clang::Sema&, bool, bool) (/zdata/shaoli/compilers/ccbuilder-compilers/clang-2cdc6f2ca62e83fec445114fbbe6276e9ab2a7d0/bin/../lib/libclang-cpp.so.14git+0x98b0d9) #20 0x00007fd797470ce8 clang::CodeGenAction::ExecuteAction() (/zdata/shaoli/compilers/ccbuilder-compilers/clang-2cdc6f2ca62e83fec445114fbbe6276e9ab2a7d0/bin/../lib/libclang-cpp.so.14git+0x1fcbce8) #21 0x00007fd797ef89a9 clang::FrontendAction::Execute() (/zdata/shaoli/compilers/ccbuilder-compilers/clang-2cdc6f2ca62e83fec445114fbbe6276e9ab2a7d0/bin/../lib/libclang-cpp.so.14git+0x2a539a9) #22 0x00007fd797e8238e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/zdata/shaoli/compilers/ccbuilder-compilers/clang-2cdc6f2ca62e83fec445114fbbe6276e9ab2a7d0/bin/../lib/libclang-cpp.so.14git+0x29dd38e) #23 0x00007fd797f8c223 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/zdata/shaoli/compilers/ccbuilder-compilers/clang-2cdc6f2ca62e83fec445114fbbe6276e9ab2a7d0/bin/../lib/libclang-cpp.so.14git+0x2ae7223) #24 0x000055efe3794127 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/zdata/shaoli/compilers/ccbuilder-compilers/clang-2cdc6f2ca62e83fec445114fbbe6276e9ab2a7d0/bin/clang-14+0x15127) #25 0x000055efe3790778 ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&) driver.cpp:0:0 #26 0x000055efe378d361 main (/zdata/shaoli/compilers/ccbuilder-compilers/clang-2cdc6f2ca62e83fec445114fbbe6276e9ab2a7d0/bin/clang-14+0xe361) #27 0x00007fd790ac9083 __libc_start_main /build/glibc-BHL3KM/glibc-2.31/csu/../csu/libc-start.c:342:3 #28 0x000055efe37902ee _start (/zdata/shaoli/compilers/ccbuilder-compilers/clang-2cdc6f2ca62e83fec445114fbbe6276e9ab2a7d0/bin/clang-14+0x112ee) clang-14: error: unable to execute command: Aborted clang-14: error: clang frontend command failed due to signal (use -v to see invocation) clang version 14.0.0 (https://github.com/llvm/llvm-project.git 2cdc6f2ca62e83fec445114fbbe6276e9ab2a7d0) Target: x86_64-unknown-linux-gnu Thread model: posix InstalledDir: /zdata/shaoli/compilers/ccbuilder-compilers/clang-2cdc6f2ca62e83fec445114fbbe6276e9ab2a7d0/bin clang-14: note: diagnostic msg: ******************** %