icx -O0 ICE error in backend: Cannot emit physreg copy instruction

[vzecca]

cat icxerr4.c
// icx -O0 ICE error in backend: Cannot emit physreg copy instruction
void foo (void)
{
register int r19 asm ("19");

asm volatile ("# %0" : "=r"(r19));
}

icx -S -O0 icxerr4.c
fatal error: error in backend: Cannot emit physreg copy instruction
PLEASE submit a bug report to https://software.intel.com/en-us/support/priority-support and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0. Program arguments: /opt/intel/oneapi/compiler/2021.3.0/linux/bin/clang @/tmp/icxargSEcVCE
1. <eof> parser at end of file
2. Code generation
3. Running pass 'Function Pass Manager' on module 'icxerr4.c'.
4. Running pass 'Post-RA pseudo instruction expansion pass' on function ''
#0 0x000055d310f0a68a llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/intel/oneapi/compiler/2021.3.0/linux/bin/clang+0x438f68a)
#1 0x000055d310f0a430 llvm::sys::RunSignalHandlers() (/opt/intel/oneapi/compiler/2021.3.0/linux/bin/clang+0x438f430)
#2 0x000055d310ebc2c7 (anonymous namespace)::CrashRecoveryContextImpl::HandleCrash(int, unsigned long) (/opt/intel/oneapi/compiler/2021.3.0/linux/bin/clang+0x43412c7)
#3 0x000055d310ebc27b (/opt/intel/oneapi/compiler/2021.3.0/linux/bin/clang+0x434127b)
#4 0x000055d310689957 llvm::sys::Process::Exit(int, bool) (/opt/intel/oneapi/compiler/2021.3.0/linux/bin/clang+0x3b0e957)
#5 0x000055d310689770 clang::DiagnosticsEngine::Report(unsigned int) (/opt/intel/oneapi/compiler/2021.3.0/linux/bin/clang+0x3b0e770)
#6 0x000055d30f0c3ab4 llvm::report_fatal_error(llvm::Twine const&, bool) (/opt/intel/oneapi/compiler/2021.3.0/linux/bin/clang+0x2548ab4)
#7 0x000055d30f29abe5 (/opt/intel/oneapi/compiler/2021.3.0/linux/bin/clang+0x271fbe5)
#8 0x000055d310413279 llvm::X86InstrInfo::copyPhysReg(llvm::MachineBasicBlock&, llvm::MachineInstrBundleIterator<llvm::MachineInstr, false>, llvm::DebugLoc const&, llvm::MCRegister, llvm::MCRegister, bool) const (/opt/intel/oneapi/compiler/2021.3.0/linux/bin/clang+0x3898279)
#9 0x000055d30fbfcc8b (anonymous namespace)::ExpandPostRA::runOnMachineFunction(llvm::MachineFunction&) (/opt/intel/oneapi/compiler/2021.3.0/linux/bin/clang+0x3081c8b)
#10 0x000055d30f7926c9 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (/opt/intel/oneapi/compiler/2021.3.0/linux/bin/clang+0x2c176c9)
#11 0x000055d30f0cc2d7 llvm::FPPassManager::runOnFunction(llvm::Function&) (/opt/intel/oneapi/compiler/2021.3.0/linux/bin/clang+0x25512d7)
#12 0x000055d30f0cc11f llvm::FPPassManager::runOnModule(llvm::Module&) (/opt/intel/oneapi/compiler/2021.3.0/linux/bin/clang+0x255111f)
#13 0x000055d3100fcd3a llvm::legacy::PassManagerImpl::run(llvm::Module&) (/opt/intel/oneapi/compiler/2021.3.0/linux/bin/clang+0x3581d3a)
#14 0x000055d3100f7114 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> >) (/opt/intel/oneapi/compiler/2021.3.0/linux/bin/clang+0x357c114)
#15 0x000055d3100f6224 clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) (/opt/intel/oneapi/compiler/2021.3.0/linux/bin/clang+0x357b224)
#16 0x000055d310250353 clang::ParseAST(clang::Sema&, bool, bool) (/opt/intel/oneapi/compiler/2021.3.0/linux/bin/clang+0x36d5353)
#17 0x000055d31024f507 clang::CodeGenAction::ExecuteAction() (/opt/intel/oneapi/compiler/2021.3.0/linux/bin/clang+0x36d4507)
#18 0x000055d30f0d1f4e clang::FrontendAction::Execute() (/opt/intel/oneapi/compiler/2021.3.0/linux/bin/clang+0x2556f4e)
#19 0x000055d30f0d14b5 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/intel/oneapi/compiler/2021.3.0/linux/bin/clang+0x25564b5)
#20 0x000055d31038e427 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/intel/oneapi/compiler/2021.3.0/linux/bin/clang+0x3813427)
#21 0x000055d31038a676 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/intel/oneapi/compiler/2021.3.0/linux/bin/clang+0x380f676)
#22 0x000055d3104349e8 ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&) (/opt/intel/oneapi/compiler/2021.3.0/linux/bin/clang+0x38b99e8)
#23 0x000055d313214ec2 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) (/opt/intel/oneapi/compiler/2021.3.0/linux/bin/clang+0x6699ec2)
#24 0x000055d310413f11 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/intel/oneapi/compiler/2021.3.0/linux/bin/clang+0x3898f11)
#25 0x000055d310413d65 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 (/opt/intel/oneapi/compiler/2021.3.0/linux/bin/clang+0x3898d65)
#26 0x000055d31002edfd clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&) const (/opt/intel/oneapi/compiler/2021.3.0/linux/bin/clang+0x34b3dfd)
#27 0x000055d31002e89f clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::__1::pair<int, clang::driver::Command const*> >&) const (/opt/intel/oneapi/compiler/2021.3.0/linux/bin/clang+0x34b389f)
#28 0x000055d31002dec9 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::__1::pair<int, clang::driver::Command const*> >&) (/opt/intel/oneapi/compiler/2021.3.0/linux/bin/clang+0x34b2ec9)
#29 0x000055d310024e39 main (/opt/intel/oneapi/compiler/2021.3.0/linux/bin/clang+0x34a9e39)
#30 0x000014ed6a154b75 (/usr/lib64/libc.so.6+0x27b75)
#31 0x000055d3130f7c78 _start (/opt/intel/oneapi/compiler/2021.3.0/linux/bin/clang+0x657cc78)
clang: error: clang frontend command failed with exit code 70 (use -v to see invocation)
Intel(R) oneAPI DPC++/C++ Compiler 2021.3.0 (2021.3.0.20210619)
Target: x86_64-unknown-linux-gnu
Thread model: posix

[ShivaniK_Intel]

Hi,

Thanks for reaching out to us.

We are able to reproduce the error at our end. We are working on it and will get back to you soon.

Thanks & Regards

Shivani  

[Sravani_K_Intel]

Issue escalated to Engineering via CMPLRLLVM-29860

[Sravani_K_Intel]

Hi Vittorio,

What's the expected behavior here? The test also failed on GCC and ICC https://godbolt.org/z/T5bnWTWbY. It looks more like test case problem. A good example https://godbolt.org/z/Pfdx3vPPc

[JyotsnaK_Intel]

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