| Issue |
173761
|
| Summary |
[RISC-V] Clang crashes when running pass 'RISC-V DAG->DAG Pattern Instruction Selection' on function '@_Z1yv'
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
ams-x9v2b7kq
|
## [RISC-V] Clang crashes when running pass 'RISC-V DAG->DAG Pattern Instruction Selection' on function '@_Z1yv'
### code link: https://godbolt.org/z/4E35bd6do
The test case is reduced by C-Reduce.
```c++
int a, j, k, m, o, p, q, r;
char l;
short n, u;
int s[24][6];
extern int t[], v[];
extern bool w[][4][4][4];
char x[36];
void y() {
for (short b = 0; b < 31; b += 2) {
for (char c = 0; c < j; c = 3)
;
for (bool d = 0; d < 1; d = r ?: t[b]) {
for (int e(k); e; e += n)
for (int f(a); f; f += 4)
o = v[b];
#pragma clang loop vectorize_predicate(enable)
for (short g = 0; g < m; g++) {
p = q <= w[g][g][b][b];
for (int h = 0; h < 24; h += 4)
;
for (int i = 0; i < 24; i += 4) {
u = k ?: s[i][i];
x[i] = w[b][d][g][i] ? w[b][b][b][i] : l;
}
}
}
}
}
```
```
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: /home/2025-compiler/gcc-16-20251221/bin/clang++ --gcc-toolchain=/home/2025-compiler/gcc-16-20251221 -O3 -march=rv64gcv_zvfh -Werror=uninitialized -Werror=implicitly-unsigned-literal -Wno-pass-failed -c func.cpp -o func.o
1. <eof> parser at end of file
2. Code generation
3. Running pass 'Function Pass Manager' on module 'func.cpp'.
4. Running pass 'RISC-V DAG->DAG Pattern Instruction Selection' on function '@_Z1yv'
#0 0x0000556adac9d852 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/home/2025-compiler/gcc-16-20251221/bin/clang+++0x1de9852)
#1 0x0000556adac9b2fc llvm::sys::CleanupOnSignal(unsigned long) (/home/2025-compiler/gcc-16-20251221/bin/clang+++0x1de72fc)
#2 0x0000556adabdb988 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x00007f1e6d335330 (/lib/x86_64-linux-gnu/libc.so.6+0x45330)
#4 0x0000556ada2d6578 llvm::EVT::getExtendedSizeInBits() const (/home/2025-compiler/gcc-16-20251221/bin/clang+++0x1422578)
#5 0x0000556ad9c836aa legalizeScatterGatherIndexType(llvm::SDLoc, llvm::SDValue&, llvm::ISD::MemIndexType&, llvm::TargetLowering::DAGCombinerInfo&) (.isra.0) RISCVISelLowering.cpp:0:0
#6 0x0000556ad9cf3f7c llvm::RISCVTargetLowering::PerformDAGCombine(llvm::SDNode*, llvm::TargetLowering::DAGCombinerInfo&) const (/home/2025-compiler/gcc-16-20251221/bin/clang+++0xe3ff7c)
#7 0x0000556adbef6b89 (anonymous namespace)::DAGCombiner::combine(llvm::SDNode*) DAGCombiner.cpp:0:0
#8 0x0000556adbef8126 (anonymous namespace)::DAGCombiner::Run(llvm::CombineLevel) DAGCombiner.cpp:0:0
#9 0x0000556adbefb466 llvm::SelectionDAG::Combine(llvm::CombineLevel, llvm::BatchAAResults*, llvm::CodeGenOptLevel) (/home/2025-compiler/gcc-16-20251221/bin/clang+++0x3047466)
#10 0x0000556adc01a389 llvm::SelectionDAGISel::CodeGenAndEmitDAG() (/home/2025-compiler/gcc-16-20251221/bin/clang+++0x3166389)
#11 0x0000556adc01d00d llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) (/home/2025-compiler/gcc-16-20251221/bin/clang+++0x316900d)
#12 0x0000556adc01ebe5 llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) (/home/2025-compiler/gcc-16-20251221/bin/clang+++0x316abe5)
#13 0x0000556adc00d7a9 llvm::SelectionDAGISelLegacy::runOnMachineFunction(llvm::MachineFunction&) (/home/2025-compiler/gcc-16-20251221/bin/clang+++0x31597a9)
#14 0x0000556ada0f6ac0 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (/home/2025-compiler/gcc-16-20251221/bin/clang+++0x1242ac0)
#15 0x0000556ada6eb849 llvm::FPPassManager::runOnFunction(llvm::Function&) (/home/2025-compiler/gcc-16-20251221/bin/clang+++0x1837849)
#16 0x0000556ada6eb9f4 llvm::FPPassManager::runOnModule(llvm::Module&) (/home/2025-compiler/gcc-16-20251221/bin/clang+++0x18379f4)
#17 0x0000556ada6ead77 llvm::legacy::PassManagerImpl::run(llvm::Module&) (/home/2025-compiler/gcc-16-20251221/bin/clang+++0x1836d77)
#18 0x0000556adaf2337b 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*) (/home/2025-compiler/gcc-16-20251221/bin/clang+++0x206f37b)
#19 0x0000556adb5030a9 clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) (/home/2025-compiler/gcc-16-20251221/bin/clang+++0x264f0a9)
#20 0x0000556adcf4908c clang::ParseAST(clang::Sema&, bool, bool) (/home/2025-compiler/gcc-16-20251221/bin/clang+++0x409508c)
#21 0x0000556adb83ed8e clang::FrontendAction::Execute() (/home/2025-compiler/gcc-16-20251221/bin/clang+++0x298ad8e)
#22 0x0000556adb7c06d3 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/home/2025-compiler/gcc-16-20251221/bin/clang+++0x290c6d3)
#23 0x0000556adb9225af clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/home/2025-compiler/gcc-16-20251221/bin/clang+++0x2a6e5af)
#24 0x0000556ad9b24a7d cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/home/2025-compiler/gcc-16-20251221/bin/clang+++0xc70a7d)
#25 0x0000556ad9b1c25a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>) driver.cpp:0:0
#26 0x0000556ad9b1c2b5 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
#27 0x0000556adb57f5bd 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
#28 0x0000556adabdbdb7 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/home/2025-compiler/gcc-16-20251221/bin/clang+++0x1d27db7)
#29 0x0000556adb57fcb1 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
#30 0x0000556adb542ed6 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/home/2025-compiler/gcc-16-20251221/bin/clang+++0x268eed6)
#31 0x0000556adb543f39 clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/home/2025-compiler/gcc-16-20251221/bin/clang+++0x268ff39)
#32 0x0000556adb55584c clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/home/2025-compiler/gcc-16-20251221/bin/clang+++0x26a184c)
#33 0x0000556ad9b21111 clang_main(int, char**, llvm::ToolContext const&) (/home/2025-compiler/gcc-16-20251221/bin/clang+++0xc6d111)
#34 0x0000556ad9a231da main (/home/2025-compiler/gcc-16-20251221/bin/clang+++0xb6f1da)
#35 0x00007f1e6d31a1ca (/lib/x86_64-linux-gnu/libc.so.6+0x2a1ca)
#36 0x00007f1e6d31a28b __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2a28b)
#37 0x0000556ad9b1bc85 _start (/home/2025-compiler/gcc-16-20251221/bin/clang+++0xc67c85)
clang++: error: clang frontend command failed with exit code 139 (use -v to see invocation)
clang version 22.0.0git
Target: riscv64-unknown-unknown-elf
Thread model: posix
InstalledDir: /home/2025-compiler/gcc-16-20251221/bin
clang++: note: diagnostic msg:
********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang++: note: diagnostic msg: /tmp/func-90a260.cpp
clang++: note: diagnostic msg: /tmp/func-90a260.sh
clang++: note: diagnostic msg:
********************
```
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