[llvm-bugs] [Bug 41917] New: Regression(360859): Assertion failed: Dead.count(Pred) && "All predecessors must be dead!" on 32-bit win

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=41917

            Bug ID: 41917
           Summary: Regression(360859): Assertion failed: Dead.count(Pred)
                    && "All predecessors must be dead!" on 32-bit win
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Transformation Utilities
          Assignee: unassignedbugs at nondot.org
          Reporter: nicolasweber at gmx.de
                CC: llvm-bugs at lists.llvm.org

thakis at thakis:~/src/llvm-project$ ./Path-4503c7.reduced.sh
clang: ../../llvm/lib/Transforms/Utils/BasicBlockUtils.cpp:97: void
llvm::DeleteDeadBlocks(ArrayRef<llvm::BasicBlock *>, llvm::DomTreeUpdater *,
bool): Assertion `Dead.count(Pred) && "All predecessors must be dead!"' failed.
Stack dump:
0.      Program arguments:
/usr/local/google/home/thakis/src/llvm-project/out/gn/bin/clang -cc1 -triple
i386-pc-windows-msvc19.11.0 -emit-obj -Os Path-4503c7.reduced.cpp
1.      <eof> parser at end of file
2.      Code generation
3.      Running pass 'Function Pass Manager' on module
'Path-4503c7.reduced.cpp'.
4.      Running pass 'Merge contiguous icmps into a memcmp' on function
'@"?f@@YA_NVa@@0 at Z"'
 #0 0x0000000002f81d6d PrintStackTraceSignalHandler(void*)
(/usr/local/google/home/thakis/src/llvm-project/out/gn/bin/clang+0x2f81d6d)
 #1 0x0000000002f7faee llvm::sys::RunSignalHandlers()
(/usr/local/google/home/thakis/src/llvm-project/out/gn/bin/clang+0x2f7faee)
 #2 0x0000000002f81f28 SignalHandler(int)
(/usr/local/google/home/thakis/src/llvm-project/out/gn/bin/clang+0x2f81f28)
 #3 0x00007f3beeb490c0 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x110c0)
 #4 0x00007f3bedd0cfcf raise (/lib/x86_64-linux-gnu/libc.so.6+0x32fcf)
 #5 0x00007f3bedd0e3fa abort (/lib/x86_64-linux-gnu/libc.so.6+0x343fa)
 #6 0x00007f3bedd05e37 (/lib/x86_64-linux-gnu/libc.so.6+0x2be37)
 #7 0x00007f3bedd05ee2 (/lib/x86_64-linux-gnu/libc.so.6+0x2bee2)
 #8 0x000000000342f6e1
llvm::DeleteDeadBlocks(llvm::ArrayRef<llvm::BasicBlock*>,
llvm::DomTreeUpdater*, bool)
(/usr/local/google/home/thakis/src/llvm-project/out/gn/bin/clang+0x342f6e1)
 #9 0x00000000033670a2 (anonymous
namespace)::MergeICmps::runOnFunction(llvm::Function&)
(/usr/local/google/home/thakis/src/llvm-project/out/gn/bin/clang+0x33670a2)
#10 0x0000000002dbdd56 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/usr/local/google/home/thakis/src/llvm-project/out/gn/bin/clang+0x2dbdd56)
#11 0x0000000002dbe063 llvm::FPPassManager::runOnModule(llvm::Module&)
(/usr/local/google/home/thakis/src/llvm-project/out/gn/bin/clang+0x2dbe063)
#12 0x0000000002dbe6ac llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/usr/local/google/home/thakis/src/llvm-project/out/gn/bin/clang+0x2dbe6ac)
#13 0x0000000002171cbd clang::EmitBackendOutput(clang::DiagnosticsEngine&,
clang::HeaderSearchOptions const&, clang::CodeGenOptions const&,
clang::TargetOptions const&, clang::LangOptions const&, llvm::DataLayout
const&, llvm::Module*, clang::BackendAction,
std::unique_ptr<llvm::raw_pwrite_stream,
std::default_delete<llvm::raw_pwrite_stream> >)
(/usr/local/google/home/thakis/src/llvm-project/out/gn/bin/clang+0x2171cbd)
#14 0x0000000002752bc7
clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&)
(/usr/local/google/home/thakis/src/llvm-project/out/gn/bin/clang+0x2752bc7)
#15 0x0000000003983aa5 clang::ParseAST(clang::Sema&, bool, bool)
(/usr/local/google/home/thakis/src/llvm-project/out/gn/bin/clang+0x3983aa5)
#16 0x00000000026b4c60 clang::FrontendAction::Execute()
(/usr/local/google/home/thakis/src/llvm-project/out/gn/bin/clang+0x26b4c60)

thakis at thakis:~/src/llvm-project$ cat Path-4503c7.reduced.sh
/usr/local/google/home/thakis/src/llvm-project/out/gn/bin/clang -cc1 -triple
i386-pc-windows-msvc19.11.0 -emit-obj -Os Path-4503c7.reduced.cpp

thakis at thakis:~/src/llvm-project$ cat Path-4503c7.reduced.cpp
class a {
  int b;
  int c;
  int h;
  int d;
  int e;
  friend bool f(a, a);
};
bool fn2();
bool f(a g, a p2) {
  fn2() && fn2();
  return g.c == p2.c && g.h == p2.h;
}

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