Flaky Behavior on Inline-Float.c

[JonathanDLTran]

When running inline-float.c, sometimes, the pass crashes on when converted egg terms back to llvm instructions.
The error message is:

Stopped after 4 iterations, reason: Some(Saturated)
Dropping inapplicable rules: div-1 div-1-inv neg-neg neg-neg-rev neg-sgn neg-sgn-rev neg-zero-inv neg-zero-inv-rev neg-minus neg-minus-rev neg-minus-zero neg-minus-zero-rev sqrt-1-inv sqrt-1-inv-rev neg_unop sqrt_unop /_binop
Stopped after 4 iterations, reason: Some(Saturated)
Dropping inapplicable rules: div-1 div-1-inv neg-neg neg-neg-rev neg-sgn neg-sgn-rev neg-zero-inv neg-zero-inv-rev neg-minus neg-minus-rev neg-minus-zero neg-minus-zero-rev sqrt-1-inv sqrt-1-inv-rev neg_unop sqrt_unop /_binop
Stopped after 4 iterations, reason: Some(Saturated)
Dropping inapplicable rules: div-1 div-1-inv neg-neg neg-neg-rev neg-sgn neg-sgn-rev neg-zero-inv neg-zero-inv-rev neg-minus neg-minus-rev neg-minus-zero neg-minus-zero-rev sqrt-1-inv sqrt-1-inv-rev neg_unop sqrt_unop /_binop
Stopped after 11 iterations, reason: Some(Saturated)
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: /usr/local/opt/llvm/bin/clang -emit-llvm -S -Xclang -load -Xclang target/debug/libllvmlib.dylib -mllvm -opt -mllvm -print=false build/aa.ll -o build/diospyros.ll 
1.	Per-module optimization passes
2.	Running pass 'Print Module IR' on module 'build/aa.ll'.
0  libLLVM.dylib            0x00000001091ae6d4 llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 40
1  libLLVM.dylib            0x00000001091ae151 llvm::sys::CleanupOnSignal(unsigned long) + 184
2  libLLVM.dylib            0x000000010911ae21 (anonymous namespace)::CrashRecoveryContextImpl::HandleCrash(int, unsigned long) + 97
3  libLLVM.dylib            0x000000010911af8a CrashRecoverySignalHandler(int) + 135
4  libsystem_platform.dylib 0x00007fff6a5fdb5d _sigtramp + 29
5  libLLVM.dylib            0x0000000109dd7eb1 llvm::TargetLibraryAnalysis::run(llvm::Function const&, llvm::AnalysisManager<llvm::Function>&) + 209
6  libLLVM.dylib            0x00000001091bde7b WriteAsOperandInternal(llvm::raw_ostream&, llvm::Value const*, (anonymous namespace)::TypePrinting*, llvm::SlotTracker*, llvm::Module const*) + 711
7  libLLVM.dylib            0x00000001091b6860 (anonymous namespace)::AssemblyWriter::printInstruction(llvm::Instruction const&) + 2030
8  libLLVM.dylib            0x00000001091b3423 (anonymous namespace)::AssemblyWriter::printBasicBlock(llvm::BasicBlock const*) + 625
9  libLLVM.dylib            0x00000001091b2e80 (anonymous namespace)::AssemblyWriter::printFunction(llvm::Function const*) + 2840
10 libLLVM.dylib            0x00000001091b4681 llvm::Module::print(llvm::raw_ostream&, llvm::AssemblyAnnotationWriter*, bool, bool) const + 4609
11 libLLVM.dylib            0x00000001092548f6 llvm::PrintModulePass::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) + 362
12 libLLVM.dylib            0x0000000109254e96 (anonymous namespace)::PrintModulePassWrapper::runOnModule(llvm::Module&) + 50
13 libLLVM.dylib            0x0000000109274dd4 llvm::legacy::PassManagerImpl::run(llvm::Module&) + 668
14 libclang-cpp.dylib       0x0000000105ec5d66 clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::HeaderSearchOptions const&, clang::CodeGenOptions const&, clang::TargetOptions const&, clang::LangOptions const&, llvm::DataLayout const&, llvm::Module*, clang::BackendAction, std::__1::unique_ptr<llvm::raw_pwrite_stream, std::__1::default_delete<llvm::raw_pwrite_stream> >) + 10572
15 libclang-cpp.dylib       0x00000001060ebf0d clang::CodeGenAction::ExecuteAction() + 1737
16 libclang-cpp.dylib       0x00000001065ecf9b clang::FrontendAction::Execute() + 77
17 libclang-cpp.dylib       0x00000001065b4fc1 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 1287
18 libclang-cpp.dylib       0x000000010663a7db clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 1059
19 clang                    0x00000001054530b8 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) + 1880
20 clang                    0x00000001054519c6 ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&) + 270
21 libclang-cpp.dylib       0x00000001063b2301 void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optional<llvm::StringRef> >, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >*, bool*) const::$_1>(long) + 23
22 libLLVM.dylib            0x000000010911ad9c llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) + 218
23 libclang-cpp.dylib       0x00000001063b19bf clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optional<llvm::StringRef> >, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >*, bool*) const + 233
24 libclang-cpp.dylib       0x0000000106392796 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&) const + 526
25 libclang-cpp.dylib       0x0000000106392985 clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::__1::pair<int, clang::driver::Command const*> >&) const + 95
26 libclang-cpp.dylib       0x00000001063a15ca clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::__1::pair<int, clang::driver::Command const*> >&) + 210
27 clang                    0x0000000105451202 main + 7204
28 libdyld.dylib            0x00007fff6a4123d5 start + 1
29 libdyld.dylib            0x000000000000000e start + 18446603338733509690
clang-11: error: clang frontend command failed due to signal (use -v to see invocation)
clang version 11.0.1
Target: x86_64-apple-darwin18.7.0
Thread model: posix
InstalledDir: /usr/local/opt/llvm/bin
clang-11: note: diagnostic msg: Error generating preprocessed source(s) - no preprocessable inputs.
make: *** [run-opt] Error 254

[sampsyo]

Hmm; a crash in printInstruction looks suspicious! Probably indicates malformed IR… running the validation pass could help, as could attempting to narrow down the crashing instruction.