Clang crash: Assertion `isReg() && "This is not a register operand!"' failed.

[shao-hua-li]

Clang at -O1 crashes on the test case.

Bisected to 2cdc6f2, which was committed by @djtodoro

Compiler explorer: https://godbolt.org/z/74MTEPh36

% 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:
********************
%

[djolertrk]

I will take a look. Thanks.