| Issue |
166522
|
| Summary |
[X86][GISel] clang crashed on empty function with vector argument at -O0
|
| Labels |
backend:X86,
llvm:globalisel,
crash-on-valid
|
| Assignees |
|
| Reporter |
XChy
|
Reproducer: https://godbolt.org/z/1W1aPsEsz
Reduced C testcase:
```c
#include <stdint.h>
#define BS_VEC(type, num) type __attribute__((vector_size(num * sizeof(type))))
int64_t backsmith_pure_2(BS_VEC(uint32_t, 2)) {}
```
clang output:
```
<source>:4:45: warning: omitting the parameter name in a function definition is a C23 extension [-Wc23-extensions]
4 | int64_t backsmith_pure_2(BS_VEC(uint32_t, 2)) {}
| ^
<source>:4:48: warning: non-void function does not return a value [-Wreturn-type]
4 | int64_t backsmith_pure_2(BS_VEC(uint32_t, 2)) {}
| ^
Unsupported register size.
UNREACHABLE executed at /root/llvm-project/llvm/lib/Target/X86/GISel/X86RegisterBankInfo.cpp:190!
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 -O0 -mllvm -global-isel -mllvm -global-isel-abort=2 <source>
1. <eof> parser at end of file
2. Code generation
3. Running pass 'Function Pass Manager' on module '<source>'.
4. Running pass 'RegBankSelect' on function '@backsmith_pure_2'
#0 0x0000000004238d78 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4238d78)
#1 0x00000000042361a4 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x42361a4)
#2 0x000000000417a418 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x00007d278b242520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x00007d278b2969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
#5 0x00007d278b242476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
#6 0x00007d278b2287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
#7 0x0000000004185ffa (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4185ffa)
#8 0x0000000002d82989 llvm::X86GenRegisterBankInfo::getPartialMappingIdx(llvm::MachineInstr const&, llvm::LLT const&, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x2d82989)
#9 0x0000000002d82b42 llvm::X86RegisterBankInfo::getInstrPartialMappingIdxs(llvm::MachineInstr const&, llvm::MachineRegisterInfo const&, bool, llvm::SmallVectorImpl<llvm::X86GenRegisterBankInfo::PartialMappingIdx>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x2d82b42)
#10 0x0000000002d840cd llvm::X86RegisterBankInfo::getInstrMapping(llvm::MachineInstr const&) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x2d840cd)
#11 0x0000000005648f57 llvm::RegBankSelect::assignInstr(llvm::MachineInstr&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5648f57)
#12 0x00000000056494f5 llvm::RegBankSelect::assignRegisterBanks(llvm::MachineFunction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x56494f5)
#13 0x0000000005649736 llvm::RegBankSelect::runOnMachineFunction(llvm::MachineFunction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5649736)
#14 0x00000000034ebb59 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (.part.0) MachineFunctionPass.cpp:0:0
#15 0x0000000003b350a6 llvm::FPPassManager::runOnFunction(llvm::Function&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3b350a6)
#16 0x0000000003b35451 llvm::FPPassManager::runOnModule(llvm::Module&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3b35451)
#17 0x0000000003b35cbf llvm::legacy::PassManagerImpl::run(llvm::Module&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3b35cbf)
#18 0x00000000044f97f6 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+0x44f97f6)
#19 0x0000000004b83fa7 clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4b83fa7)
#20 0x0000000006926d7c clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6926d7c)
#21 0x0000000004b84408 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4b84408)
#22 0x0000000004e72255 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4e72255)
#23 0x0000000004df319e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4df319e)
#24 0x0000000004f6a9cd clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4f6a9cd)
#25 0x0000000000dcd1b0 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xdcd1b0)
#26 0x0000000000dc3d2a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>) driver.cpp:0:0
#27 0x0000000000dc3ead 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
#28 0x0000000004bedcb9 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
#29 0x000000000417a8b4 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x417a8b4)
#30 0x0000000004bee2cf 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
#31 0x0000000004baf022 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4baf022)
#32 0x0000000004baffce 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+0x4baffce)
#33 0x0000000004bb7725 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4bb7725)
#34 0x0000000000dc96d1 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xdc96d1)
#35 0x0000000000c79094 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xc79094)
#36 0x00007d278b229d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#37 0x00007d278b229e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#38 0x0000000000dc37c5 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xdc37c5)
clang: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134
```
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