| Issue |
107939
|
| Summary |
m68k fails to select atomic store where address is sum of two registers
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
programmerjake
|
encountered when trying to build Rust's standard library for m68k:
https://rust-lang.zulipchat.com/#narrow/stream/187780-t-compiler.2Fwg-llvm/topic/M86k.20Compilation.20Failures/near/468939538
reduced:
https://llvm.godbolt.org/z/qP4nsoq58
```llvm
define void @f(i8 %v, ptr %p, i32 %o) {
start:
%p2 = getelementptr i8, ptr %p, i32 %o
store atomic i8 %v, ptr %p2 monotonic, align 1
ret void
}
```
```
warning: overriding the module target triple with m68k-unknown-linux-gnu [-Woverride-module]
fatal error: error in backend: Cannot select: 0xb912ff0: ch = AtomicStore<(store monotonic (s8) into %ir.p2)> 0xb8cf930, 0xb912ab0, 0xb912f80
0xb912ab0: i8,ch = load<(load (s8) from %fixed-stack.2)> 0xb8cf930, FrameIndex:i32<-1>, undef:i32
0xb9129d0: i32 = FrameIndex<-1>
0xb912a40: i32 = undef
0xb912f80: i32 = add 0xb912b90, 0xb912c70
0xb912b90: i32,ch = load<(load (s32) from %fixed-stack.1)> 0xb8cf930, FrameIndex:i32<-2>, undef:i32
0xb912b20: i32 = FrameIndex<-2>
0xb912a40: i32 = undef
0xb912c70: i32,ch = load<(load (s32) from %fixed-stack.0, align 8)> 0xb8cf930, FrameIndex:i32<-3>, undef:i32
0xb912c00: i32 = FrameIndex<-3>
0xb912a40: i32 = undef
In function: f
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-18.1.0/bin/clang++ -g -o /app/output.s -fno-verbose-asm -S -x ir -fcolor-diagnostics -fno-crash-diagnostics --target=m68k-unknown-linux-gnu <source>
1. Code generation
2. Running pass 'Function Pass Manager' on module '<source>'.
3. Running pass 'M68k DAG->DAG Pattern Instruction Selection' on function '@f'
#0 0x000000000351ae38 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x351ae38)
#1 0x0000000003518f84 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x3518f84)
#2 0x0000000003467543 llvm::CrashRecoveryContext::HandleExit(int) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x3467543)
#3 0x000000000351097e llvm::sys::Process::Exit(int, bool) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x351097e)
#4 0x0000000000c17976 (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0xc17976)
#5 0x0000000003470593 llvm::report_fatal_error(llvm::Twine const&, bool) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x3470593)
#6 0x00000000045d3174 llvm::SelectionDAGISel::CannotYetSelect(llvm::SDNode*) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x45d3174)
#7 0x00000000045d9135 llvm::SelectionDAGISel::SelectCodeCommon(llvm::SDNode*, unsigned char const*, unsigned int) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x45d9135)
#8 0x00000000024cc97b (anonymous namespace)::M68kDAGToDAGISel::Select(llvm::SDNode*) M68kISelDAGToDAG.cpp:0:0
#9 0x00000000045d06f7 llvm::SelectionDAGISel::DoInstructionSelection() (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x45d06f7)
#10 0x00000000045dda15 llvm::SelectionDAGISel::CodeGenAndEmitDAG() (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x45dda15)
#11 0x00000000045e06df llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x45e06df)
#12 0x00000000045e2dc9 llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) (.part.0) SelectionDAGISel.cpp:0:0
#13 0x00000000029bc2f0 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (.part.0) MachineFunctionPass.cpp:0:0
#14 0x0000000002ee69e2 llvm::FPPassManager::runOnFunction(llvm::Function&) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x2ee69e2)
#15 0x0000000002ee6b61 llvm::FPPassManager::runOnModule(llvm::Module&) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x2ee6b61)
#16 0x0000000002ee87e0 llvm::legacy::PassManagerImpl::run(llvm::Module&) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x2ee87e0)
#17 0x000000000378ad99 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>>, clang::BackendConsumer*) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x378ad99)
#18 0x0000000003d5a8bf clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x3d5a8bf)
#19 0x0000000003fe2aa1 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x3fe2aa1)
#20 0x0000000003f6010b clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x3f6010b)
#21 0x00000000040c2473 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x40c2473)
#22 0x0000000000c19746 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0xc19746)
#23 0x0000000000c1211d ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#24 0x0000000003da1979 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
#25 0x0000000003467443 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x3467443)
#26 0x0000000003da1b99 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
#27 0x0000000003d69d17 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x3d69d17)
#28 0x0000000003d6a6cd clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x3d6a6cd)
#29 0x0000000003d7445c clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0x3d7445c)
#30 0x0000000000c16a21 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0xc16a21)
#31 0x0000000000b0fa84 main (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0xb0fa84)
#32 0x000070bdd3029d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#33 0x000070bdd3029e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#34 0x0000000000c1191e _start (/opt/compiler-explorer/clang-18.1.0/bin/clang+++0xc1191e)
clang++: error: clang frontend command failed with exit code 70 (use -v to see invocation)
Compiler returned: 70
```
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