| Issue |
166002
|
| Summary |
[MIPS64][GISel] GlobalISel crashed on a simple empty function and reported "Target needs to handle register class ID 0x35"
|
| Labels |
backend:MIPS,
crash
|
| Assignees |
|
| Reporter |
XChy
|
Reproducer: https://godbolt.org/z/45c6de4nW
Testcase:
```llvm
target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
target triple = "mips64el-unknown-unknown-elf"
define i64 @func_3() local_unnamed_addr #0 {
entry:
ret i64 undef
}
attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(none) "frame-pointer"="all" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="mips64r2" "target-features"="+mips64r2,-noabicalls" }
```
llc output:
```
Target needs to handle register class ID 0x35
UNREACHABLE executed at /root/build/lib/Target/Mips/MipsGenRegisterBank.inc:193!
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace and instructions to reproduce the bug.
Stack dump:
0. Program arguments: /opt/compiler-explorer/clang-assertions-trunk/bin/llc -o /app/output.s -x86-asm-syntax=intel -O3 -global-isel -global-isel-abort=2 <source>
1. Running pass 'Function Pass Manager' on module '<source>'.
2. Running pass 'RegBankSelect' on function '@func_3'
#0 0x000000000419b988 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0x419b988)
#1 0x0000000004198834 SignalHandler(int, siginfo_t*, void*) Signals.cpp:0:0
#2 0x000070a60e042520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#3 0x000070a60e0969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
#4 0x000070a60e042476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
#5 0x000070a60e0287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
#6 0x00000000040da8fa (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0x40da8fa)
#7 0x0000000001a3a145 llvm::MipsGenRegisterBankInfo::getRegBankFromRegClass(llvm::TargetRegisterClass const&, llvm::LLT) const (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0x1a3a145)
#8 0x0000000001a3dc0c llvm::MipsRegisterBankInfo::TypeInfoForMF::setTypesAccordingToPhysicalRegister(llvm::MachineInstr const*, llvm::MachineInstr const*, unsigned int) (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0x1a3dc0c)
#9 0x0000000001a43713 llvm::MipsRegisterBankInfo::TypeInfoForMF::visitAdjacentInstrs(llvm::MachineInstr const*, llvm::SmallVectorImpl<llvm::MachineInstr*>&, bool, llvm::MipsRegisterBankInfo::InstType&) (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0x1a43713)
#10 0x0000000001a4256d llvm::MipsRegisterBankInfo::TypeInfoForMF::visit(llvm::MachineInstr const*, llvm::MachineInstr const*, llvm::MipsRegisterBankInfo::InstType&) (.part.0) MipsRegisterBankInfo.cpp:0:0
#11 0x0000000001a43942 llvm::MipsRegisterBankInfo::TypeInfoForMF::determineInstType(llvm::MachineInstr const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0x1a43942)
#12 0x0000000001a449d5 llvm::MipsRegisterBankInfo::getInstrMapping(llvm::MachineInstr const&) const (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0x1a449d5)
#13 0x000000000488c9d7 llvm::RegBankSelect::assignInstr(llvm::MachineInstr&) (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0x488c9d7)
#14 0x000000000488cf75 llvm::RegBankSelect::assignRegisterBanks(llvm::MachineFunction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0x488cf75)
#15 0x000000000488d1b6 llvm::RegBankSelect::runOnMachineFunction(llvm::MachineFunction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0x488d1b6)
#16 0x000000000307eca9 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (.part.0) MachineFunctionPass.cpp:0:0
#17 0x00000000036ce866 llvm::FPPassManager::runOnFunction(llvm::Function&) (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0x36ce866)
#18 0x00000000036cec11 llvm::FPPassManager::runOnModule(llvm::Module&) (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0x36cec11)
#19 0x00000000036cf47f llvm::legacy::PassManagerImpl::run(llvm::Module&) (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0x36cf47f)
#20 0x00000000008fa6c3 compileModule(char**, llvm::LLVMContext&) llc.cpp:0:0
#21 0x00000000007c7846 main (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0x7c7846)
#22 0x000070a60e029d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#23 0x000070a60e029e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#24 0x00000000008efb05 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0x8efb05)
Program terminated with signal: SIGSEGV
Compiler returned: 139
```
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