APAR status

• Closed as program error.

Error description

• When compiling large testcase with -O2 or higher, the compiler
  may produce an assert similar to the following:
  
  $ ibm-clang -c -O3 -m64 -o assert_invalid_basic_block_argument.o
  assert_invalid_basic_block_argument.ll
  
  Assertion failed: Idx >= 0 && "Invalid basic block argument!",
  file  llvm/include/llvm/IR/Instructions.h, line 2905,
  llvm::Value *llvm::PHINode::getIncomingValueForBlock(const
  llvm::BasicBlock *) const()
  PLEASE submit a bug report to [https://ibm.biz/openxlcpp-suppor
  t](https://urldefense.proofpoint.com/v2/url?u=https-3A__ibm.biz
  _openxlcpp-2Dsupport&d=DwMFAg&c=BSDicqBQBDjDI9RkVyTcHQ&r=UoTB0N
  JyahNcSmHLXog12y9J9_TFjXKTjd2MXnBGUiY&m=3WgWAAc-0PUK3dn4xsYEOPX
  SxybK47XYuFFIEg8js3uLn0PJsls8KIcYGkX2CEqw&s=Pyge8dy4CkFip4OyDwy
  xQm1be3wNwFFM9ewgjyStV-Q&e=)and include the crash backtrace, pre
  associated run script.
  Stack dump:
  0.      Program arguments:
  /opt/IBM/openxlC/17.1.2/bin/.ibm-clang.orig -c -O3 -m64 -o
  assert_invalid_basic_block_argument.o
  assert_invalid_basic_block_argument.ll
  1.      Code generation
  2.      Running pass 'Function Pass Manager' on module
  'assert_invalid_basic_block_argument.ll'.
  3.      Running pass 'Canonicalize natural loops' on function
  '@setup_phase'
   Offset 0x000000c4 pthread_kill
   Offset 0x00000048 _p_raise
   Offset 0x0000004c raise
   Offset 0x000000bc abort
   Offset 0x0000027c __assert_c99
   Offset 0x00000110
  llvm::PHINode::getIncomingValueForBlock(llvm::BasicBlock const*)
  const
   Offset 0x00000154 UpdatePHINodes(llvm::BasicBlock*,
  llvm::BasicBlock*, llvm::ArrayRef<llvm::BasicBlock*>,
  llvm::BranchInst*, bool)
   Offset 0x00000530 SplitBlockPredecessorsImpl(llvm::BasicBlock*,
  llvm::ArrayRef<llvm::BasicBlock*>, char const*,
  llvm::DomTreeUpdater*, llvm::DominatorTree*, llvm::LoopInfo*,
  llvm::MemorySSAUpdater*, bool)
   Offset 0x00000030
  llvm::SplitBlockPredecessors(llvm::BasicBlock*,
  llvm::ArrayRef<llvm::BasicBlock*>, char const*,
  llvm::DominatorTree*, llvm::LoopInfo*, llvm::MemorySSAUpdater*,
  bool)
   Offset 0x00000730 llvm::formDedicatedExitBlocks(llvm::Loop*,
  llvm::DominatorTree*, llvm::LoopInfo*, llvm::MemorySSAUpdater*,
  bool)
   Offset 0x00000f88 simplifyOneLoop(llvm::Loop*,
  llvm::SmallVectorImpl<llvm::Loop*>&, llvm::DominatorTree*,
  llvm::LoopInfo*, llvm::ScalarEvolution*, llvm::AssumptionCache*,
  llvm::MemorySSAUpdater*, bool)
   Offset 0x000001f8 llvm::simplifyLoop(llvm::Loop*,
  llvm::DominatorTree*, llvm::LoopInfo*, llvm::ScalarEvolution*,
  llvm::AssumptionCache*, llvm::MemorySSAUpdater*, bool)
   Offset 0x000003c0 (anonymous
  namespace)::LoopSimplify::runOnFunction(llvm::Function&)
   Offset 0x0000032c
  llvm::FPPassManager::runOnFunction(llvm::Function&)
   Offset 0x00000058
  llvm::FPPassManager::runOnModule(llvm::Module&)
   Offset 0x00000988
  llvm::legacy::PassManagerImpl::run(llvm::Module&)
   Offset 0x00000014 llvm::legacy::PassManager::run(llvm::Module&)
  
   Offset 0x000011c4
  clang::EmitBackendOutput(clang::DiagnosticsEngine&,
  clang::HeaderSearchOptions const&, clang::CodeGenOptions const&,
  clang::TargetOptions const&, clang::LangOptions const&,
  llvm::StringRef, llvm::Module*, clang::BackendAction,
  llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>,
  std::__1::unique_ptr<llvm::raw_pwrite_stream,
  std::__1::default_delete<llvm::raw_pwrite_stream>>)
   Offset 0x00000a04 clang::CodeGenAction::ExecuteAction()
   Offset 0x000000bc clang::FrontendAction::Execute()
   Offset 0x00000508
  clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
   Offset 0x00000320
  clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
   Offset 0x00000690 cc1_main(llvm::ArrayRef<char const*>, char
  const*, void*)
   Offset 0x000001c4 ExecuteCC1Tool(llvm::SmallVectorImpl<char
  const*>&, llvm::ToolContext const&)
   Offset 0x0000001c int llvm::function_ref<int
  (llvm::SmallVectorImpl<char
  const*>&)>::callback_fn<clang_main(int, char**,
  llvm::ToolContext const&)::$_0>(long, llvm::SmallVectorImpl<char
  const*>&)
   Offset 0x0000003c void llvm::function_ref<void ()>::callback_f
  n<clang::driver::CC1Command::Execute(llvm::ArrayRef<std::__1::o
  ptional<llvm::StringRef>>,std::__1::basic_string<char, std::__1:
  std::__1::allocator<char>>*, bool*) const::$_1>(long)
   Offset 0x000000dc
  llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void
  ()>)
   Offset 0x00000130 clang::driver::CC1Command::Execute(llvm::Arr
  ayRef<std::__1::optional<llvm::StringRef>>,std::__1::basic_strin
  std::__1::allocator<char>>*, bool*) const
   Offset 0x00000470 clang::driver::Compilation::ExecuteCommand(c
  lang::driver::Commandconst&, clang::driver::Command const*&, boo
   Offset 0x000003a8
  clang::driver::Compilation::ExecuteJobs(clang::driver::JobList
  const&, llvm::SmallVectorImpl<std::__1::pair<int,
  clang::driver::Command const*>>&, bool) const
   Offset 0x00000218 clang::driver::Driver::ExecuteCompilation(cl
  ang::driver::Compilation&,llvm::SmallVectorImpl<std::__1::pair<i
  const*>>&)
   Offset 0x00003340 clang_main(int, char**, llvm::ToolContext
  const&)
   Offset 0x00000028 main
   --- End of call chain ---
  .ibm-clang: error: clang frontend command failed with exit code
  134 (use -v to see invocation)
  IBM Open XL C/C++ for AIX 17.1.2 (5725-C72, 5765-J18), version
  17.1.2.10, clang version 17.0.6 (build da7bd4a
  da7bd4afc22e1c0785a242a79f42c4f67ccbae6e)
  Target: powerpc64-ibm-aix7.2.0.0
  Thread model: posix
  InstalledDir: /opt/IBM/openxlC/17.1.2/bin
  .ibm-clang: note: diagnostic msg: Error generating preprocessed
  source(s) - no preprocessable inputs.
  

Local fix

• N/A
  

Problem summary

• USERS AFFECTED:
  
  
  Users who compile with -O2 and above and who have large
  programs may be affected by this issue.
  
  
  
  
  
  PROBLEM DESCRIPTION:
  
  
  The incoming values to a certain internal backend function was
  incorrect leading to the assertion.
  

Problem conclusion

• The incoming values to the internal backend function has been
  fixed.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  XL C/C++ FOR AI

• Fixed component ID

  5725C7200

Applicable component levels