| Issue |
169987
|
| Summary |
[X86] UNREACHABLE executed at /root/llvm-project/llvm/lib/Target/X86/X86FlagsCopyLowering.cpp:712!
|
| Labels |
backend:X86,
crash
|
| Assignees |
|
| Reporter |
k-arrows
|
Note: using `-mllvm -disable-machine-dce -O1`
Reproducer:
https://godbolt.org/z/964T15rh3
```cpp
void foo(char *out) {
asm(""
: "=@ccb"(out[0]), "=@ccl"(out[1]), "=@ccz"(out[2]), "=@ccbe"(out[4]),
"=@ccge"(out[5]), "=@ccle"(out[6]));
}
```
Backtrace:
```console
Unlowered EFLAGS copy!
UNREACHABLE executed at /root/llvm-project/llvm/lib/Target/X86/X86FlagsCopyLowering.cpp:712!
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++ -g -o /app/output.s -mllvm --x86-asm-syntax=intel -fno-verbose-asm -S --gcc-toolchain=/opt/compiler-explorer/gcc-snapshot -fcolor-diagnostics -fno-crash-diagnostics -mllvm -disable-machine-dce -O1 <source>
1. <eof> parser at end of file
2. Code generation
3. Running pass 'Function Pass Manager' on module '<source>'.
4. Running pass 'X86 EFLAGS copy lowering' on function '@_Z3fooPc'
#0 0x0000000004273358 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4273358)
#1 0x0000000004270784 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4270784)
#2 0x00000000041b44b8 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x000070ab38e42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x000070ab38e969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
#5 0x000070ab38e42476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
#6 0x000070ab38e287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
#7 0x00000000041c018a (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x41c018a)
#8 0x0000000002b17dda (anonymous namespace)::X86FlagsCopyLoweringPass::runOnMachineFunction(llvm::MachineFunction&) X86FlagsCopyLowering.cpp:0:0
#9 0x00000000035284e9 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (.part.0) MachineFunctionPass.cpp:0:0
#10 0x0000000003b6ced6 llvm::FPPassManager::runOnFunction(llvm::Function&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3b6ced6)
#11 0x0000000003b6d281 llvm::FPPassManager::runOnModule(llvm::Module&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3b6d281)
#12 0x0000000003b6daef llvm::legacy::PassManagerImpl::run(llvm::Module&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3b6daef)
#13 0x0000000004531746 clang::emitBackendOutput(clang::CompilerInstance&, clang::CodeGenOptions&, 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>>, clang::BackendConsumer*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4531746)
#14 0x0000000004bc1f37 clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4bc1f37)
#15 0x000000000695755c clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x695755c)
#16 0x0000000004bc2398 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4bc2398)
#17 0x0000000004eadba5 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4eadba5)
#18 0x0000000004e2dd5e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4e2dd5e)
#19 0x0000000004fa6bdd clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4fa6bdd)
#20 0x0000000000dc7650 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xdc7650)
#21 0x0000000000dbe0ca ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>) driver.cpp:0:0
#22 0x0000000000dbe24d int llvm::function_ref<int (llvm::SmallVectorImpl<char const*>&)>::callback_fn<clang_main(int, char**, llvm::ToolContext const&)::'lambda'(llvm::SmallVectorImpl<char const*>&)>(long, llvm::SmallVectorImpl<char const*>&) driver.cpp:0:0
#23 0x0000000004c2ab89 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
#24 0x00000000041b4954 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x41b4954)
#25 0x0000000004c2b19f 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
#26 0x0000000004beb992 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4beb992)
#27 0x0000000004bec93e 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+++0x4bec93e)
#28 0x0000000004bf3d75 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4bf3d75)
#29 0x0000000000dc3a71 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xdc3a71)
#30 0x0000000000c72444 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xc72444)
#31 0x000070ab38e29d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#32 0x000070ab38e29e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#33 0x0000000000dbdb65 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xdbdb65)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134
```
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