internal compiler error: Invalid register name global variable

[llvmbot]

Bugzilla Link	48312
Version	11.0
OS	Linux
Reporter	LLVM Bugzilla Contributor
CC	@DougGregor,@zygoloid

Extended Description

https://godbolt.org/z/rW5Kaf

[llvmbot]

While I was trying to fix a warning in Linux, I was building mips tinyconfig with clang I ran into this internal compiler error.

sample code:
register long sp asm("$sp");

int f(void)
{
return sp;
}

output:

fatal error: error in backend: Invalid register name global variable
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: /opt/compiler-explorer/clang-11.0.0/bin/clang -g -o ./output.s -mllvm --x86-asm-syntax=intel -S --gcc-toolchain=/opt/compiler-explorer/gcc-10.2.0 -fcolor-diagnostics -fno-crash-diagnostics --target=mips-linux

1. parser at end of file
2. Code generation
3. Running pass 'Function Pass Manager' on module ''.
4. Running pass 'MIPS DAG->DAG Pattern Instruction Selection' on function '@f'
   #​0 0x0000556e94e9b47a llvm::sys::PrintStackTrace(llvm::raw_ostream&) (/opt/compiler-explorer/clang-11.0.0/bin/clang+0x2cab47a)
   #​1 0x0000556e94e99224 llvm::sys::RunSignalHandlers() (/opt/compiler-explorer/clang-11.0.0/bin/clang+0x2ca9224)
   #​2 0x0000556e94e99495 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-11.0.0/bin/clang+0x2ca9495)
   #​3 0x0000556e94e0df12 llvm::CrashRecoveryContext::HandleExit(int) (/opt/compiler-explorer/clang-11.0.0/bin/clang+0x2c1df12)
   #​4 0x0000556e94e920f7 llvm::sys::Process::Exit(int) (/opt/compiler-explorer/clang-11.0.0/bin/clang+0x2ca20f7)
   #​5 0x0000556e93074bc1 LLVMErrorHandler(void*, std::__cxx11::basic_string<char, std::char_traits, std::allocator > const&, bool) (/opt/compiler-explorer/clang-11.0.0/bin/clang+0xe84bc1)
   #​6 0x0000556e94e146b9 llvm::report_fatal_error(llvm::Twine const&, bool) (/opt/compiler-explorer/clang-11.0.0/bin/clang+0x2c246b9)
   #​7 0x0000556e94e147f8 (/opt/compiler-explorer/clang-11.0.0/bin/clang+0x2c247f8)
   #​8 0x0000556e939a36bf llvm::MipsTargetLowering::getRegisterByName(char const*, llvm::LLT, llvm::MachineFunction const&) const (/opt/compiler-explorer/clang-11.0.0/bin/clang+0x17b36bf)
   #​9 0x0000556e95b61525 llvm::SelectionDAGISel::Select_READ_REGISTER(llvm::SDNode*) (/opt/compiler-explorer/clang-11.0.0/bin/clang+0x3971525)
   #​10 0x0000556e95b62b51 llvm::SelectionDAGISel::SelectCodeCommon(llvm::SDNode*, unsigned char const*, unsigned int) (/opt/compiler-explorer/clang-11.0.0/bin/clang+0x3972b51)
   #​11 0x0000556e95b60b54 llvm::SelectionDAGISel::DoInstructionSelection() (/opt/compiler-explorer/clang-11.0.0/bin/clang+0x3970b54)
   #​12 0x0000556e95b67136 llvm::SelectionDAGISel::CodeGenAndEmitDAG() (/opt/compiler-explorer/clang-11.0.0/bin/clang+0x3977136)
   #​13 0x0000556e95b6b4db llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) (/opt/compiler-explorer/clang-11.0.0/bin/clang+0x397b4db)
   #​14 0x0000556e95b6d59d llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) (.part.825) (/opt/compiler-explorer/clang-11.0.0/bin/clang+0x397d59d)
   #​15 0x0000556e939a1a6a llvm::MipsDAGToDAGISel::runOnMachineFunction(llvm::MachineFunction&) (/opt/compiler-explorer/clang-11.0.0/bin/clang+0x17b1a6a)
   #​16 0x0000556e94424378 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (/opt/compiler-explorer/clang-11.0.0/bin/clang+0x2234378)
   #​17 0x0000556e947cd77f llvm::FPPassManager::runOnFunction(llvm::Function&) (/opt/compiler-explorer/clang-11.0.0/bin/clang+0x25dd77f)
   #​18 0x0000556e947cde71 llvm::FPPassManager::runOnModule(llvm::Module&) (/opt/compiler-explorer/clang-11.0.0/bin/clang+0x25dde71)
   #​19 0x0000556e947cc9b1 llvm::legacy::PassManagerImpl::run(llvm::Module&) (/opt/compiler-explorer/clang-11.0.0/bin/clang+0x25dc9b1)
   #​20 0x0000556e9511bc88 (anonymous namespace)::EmitAssemblyHelper::EmitAssembly(clang::BackendAction, std::unique_ptr<llvm::raw_pwrite_stream, std::default_deletellvm::raw_pwrite_stream >) (/opt/compiler-explorer/clang-11.0.0/bin/clang+0x2f2bc88)
   #​21 0x0000556e9511d83b 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_deletellvm::raw_pwrite_stream >) (/opt/compiler-explorer/clang-11.0.0/bin/clang+0x2f2d83b)
   #​22 0x0000556e95c61194 clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) (/opt/compiler-explorer/clang-11.0.0/bin/clang+0x3a71194)
   #​23 0x0000556e969d2f29 clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-11.0.0/bin/clang+0x47e2f29)
   #​24 0x0000556e95687479 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-11.0.0/bin/clang+0x3497479)
   #​25 0x0000556e95640f9b clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-11.0.0/bin/clang+0x3450f9b)
   #​26 0x0000556e9574db2b clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-11.0.0/bin/clang+0x355db2b)
   #​27 0x0000556e9307614c cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-11.0.0/bin/clang+0xe8614c)
   #​28 0x0000556e93072c4d ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&) (/opt/compiler-explorer/clang-11.0.0/bin/clang+0xe82c4d)
   #​29 0x0000556e95518c45 void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optionalllvm::StringRef >, std::__cxx11::basic_string<char, std::char_traits, std::allocator >, bool) const::'lambda'()>(long) (/opt/compiler-explorer/clang-11.0.0/bin/clang+0x3328c45)
   #​30 0x0000556e94e0dda3 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-11.0.0/bin/clang+0x2c1dda3)
   #​31 0x0000556e95519720 clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optionalllvm::StringRef >, std::__cxx11::basic_string<char, std::char_traits, std::allocator >, bool) const (.part.148) (/opt/compiler-explorer/clang-11.0.0/bin/clang+0x3329720)
   #​32 0x0000556e954f38f5 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&) const (/opt/compiler-explorer/clang-11.0.0/bin/clang+0x33038f5)
   #​33 0x0000556e954f433f clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*> >&) const (/opt/compiler-explorer/clang-11.0.0/bin/clang+0x330433f)
   #​34 0x0000556e954fced5 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*> >&) (/opt/compiler-explorer/clang-11.0.0/bin/clang+0x330ced5)
   #​35 0x0000556e92fb2dc1 main (/opt/compiler-explorer/clang-11.0.0/bin/clang+0xdc2dc1)
   #​36 0x00007f8c1db210b3 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x270b3)
   #​37 0x0000556e930727ca _start (/opt/compiler-explorer/clang-11.0.0/bin/clang+0xe827ca)
   clang-11: error: clang frontend command failed with exit code 70 (use -v to see invocation)
   Compiler returned: 70

[Endilll]

Still crashing as of post-17 trunk: https://godbolt.org/z/j4Mdss8Ka

fatal error: error in backend: Invalid register name global variable

PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0.	Program arguments: /opt/compiler-explorer/clang-assertions-trunk/bin/clang -gdwarf-4 -g -o /app/output.s -mllvm --x86-asm-syntax=intel -S --gcc-toolchain=/opt/compiler-explorer/gcc-9.2.0 -fcolor-diagnostics -fno-crash-diagnostics --target=mips-linux <source>
1.	<eof> parser at end of file
2.	Code generation
3.	Running pass 'Function Pass Manager' on module '<source>'.
4.	Running pass 'MIPS DAG->DAG Pattern Instruction Selection' on function '@f'
 #0 0x00000000036af848 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x36af848)
 #1 0x00000000036ad50c llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x36ad50c)
 #2 0x00000000035f6e96 llvm::CrashRecoveryContext::HandleExit(int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x35f6e96)
 #3 0x00000000036a485e llvm::sys::Process::Exit(int, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x36a485e)
 #4 0x0000000000bd52fa LLVMErrorHandler(void*, char const*, bool) cc1_main.cpp:0:0
 #5 0x0000000003601893 llvm::report_fatal_error(llvm::Twine const&, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3601893)
 #6 0x00000000036019f8 (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x36019f8)
 #7 0x0000000001adac4e llvm::MipsTargetLowering::getRegisterByName(char const*, llvm::LLT, llvm::MachineFunction const&) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x1adac4e)
 #8 0x000000000479968e llvm::SelectionDAGISel::Select_READ_REGISTER(llvm::SDNode*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x479968e)
 #9 0x000000000479c9c3 llvm::SelectionDAGISel::SelectCodeCommon(llvm::SDNode*, unsigned char const*, unsigned int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x479c9c3)
#10 0x0000000001ad9cec llvm::MipsDAGToDAGISel::Select(llvm::SDNode*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x1ad9cec)
#11 0x000000000479790f llvm::SelectionDAGISel::DoInstructionSelection() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x479790f)
#12 0x00000000047a4d27 llvm::SelectionDAGISel::CodeGenAndEmitDAG() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x47a4d27)
#13 0x00000000047a906c llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x47a906c)
#14 0x00000000047a9f82 llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) (.part.0) SelectionDAGISel.cpp:0:0
#15 0x0000000001ada30b llvm::MipsDAGToDAGISel::runOnMachineFunction(llvm::MachineFunction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x1ada30b)
#16 0x0000000002a92ca9 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (.part.0) MachineFunctionPass.cpp:0:0
#17 0x00000000030397a9 llvm::FPPassManager::runOnFunction(llvm::Function&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x30397a9)
#18 0x00000000030399e1 llvm::FPPassManager::runOnModule(llvm::Module&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x30399e1)
#19 0x000000000303a202 llvm::legacy::PassManagerImpl::run(llvm::Module&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x303a202)
#20 0x0000000003923b10 (anonymous namespace)::EmitAssemblyHelper::EmitAssembly(clang::BackendAction, std::unique_ptr<llvm::raw_pwrite_stream, std::default_delete<llvm::raw_pwrite_stream>>) BackendUtil.cpp:0:0
#21 0x0000000003924439 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::unique_ptr<llvm::raw_pwrite_stream, std::default_delete<llvm::raw_pwrite_stream>>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3924439)
#22 0x0000000004908d2f clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4908d2f)
#23 0x0000000005dfd8f9 clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5dfd8f9)
#24 0x00000000049074d8 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x49074d8)
#25 0x0000000004170419 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4170419)
#26 0x00000000040f104e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x40f104e)
#27 0x000000000424f82e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x424f82e)
#28 0x0000000000bd6c10 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xbd6c10)
#29 0x0000000000bcee3a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#30 0x0000000003f526d9 void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const::'lambda'()>(long) Job.cpp:0:0
#31 0x00000000035f6dd4 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x35f6dd4)
#32 0x0000000003f52ccf clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const (.part.0) Job.cpp:0:0
#33 0x0000000003f1b055 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3f1b055)
#34 0x0000000003f1babd clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3f1babd)
#35 0x0000000003f239e5 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3f239e5)
#36 0x0000000000bd4a1c clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xbd4a1c)
#37 0x0000000000ad1421 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xad1421)
#38 0x00007f91eb1e9083 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x24083)
#39 0x0000000000bce91e _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xbce91e)
clang: error: clang frontend command failed with exit code 70 (use -v to see invocation)

[llvmbot]

@llvm/issue-subscribers-backend-mips

[brad0]

cc @yingopq

[el-ev]

Blocked by #136132