| Issue |
183451
|
| Summary |
clang crashes with #pragma omp tile and -fopenmp-simd
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
chillenb
|
I was messing around with the new openmp features and encountered a bug. Clang crashes trying to compile the following code with `-fopenmp-simd`.
What's the correct behavior here? Should the loop transformation be enabled because it doesn't need the runtime library, or should it be disabled because it's not a SIMD feature?
```c
void dowork(double *a, int n) {
#pragma omp tile sizes(2,2)
for(int i = 0; i < n; i++)
for(int j = 0; j < n; j++) {
a[i*n+j] *= 2.0;
}
}
```
Link: https://godbolt.org/z/hzqn3Pnq4
```
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-21.1.0/bin/clang -g -o /app/output.s -mllvm --x86-asm-syntax=intel -fno-verbose-asm -S --gcc-toolchain=/opt/compiler-explorer/gcc-15.2.0 -fcolor-diagnostics -fno-crash-diagnostics -fopenmp-simd <source>
1. <eof> parser at end of file
2. <source>:1:6: LLVM IR generation of declaration 'dowork'
3. <source>:1:6: Generating code for declaration 'dowork'
#0 0x0000000003bfa6c8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-21.1.0/bin/clang+0x3bfa6c8)
#1 0x0000000003bf809c llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-21.1.0/bin/clang+0x3bf809c)
#2 0x0000000003b483f8 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x00007f9157042520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x00000000076bc570 clang::CapturedStmt::Capture::getCaptureKind() const (/opt/compiler-explorer/clang-21.1.0/bin/clang+0x76bc570)
#5 0x00000000040ea793 clang::CodeGen::CodeGenFunction::EmitSimpleOMPExecutableDirective(clang::OMPExecutableDirective const&) (/opt/compiler-explorer/clang-21.1.0/bin/clang+0x40ea793)
#6 0x00000000040ad402 clang::CodeGen::CodeGenFunction::EmitStmt(clang::Stmt const*, llvm::ArrayRef<clang::Attr const*>) (/opt/compiler-explorer/clang-21.1.0/bin/clang+0x40ad402)
#7 0x00000000040b48f9 clang::CodeGen::CodeGenFunction::EmitCompoundStmtWithoutScope(clang::CompoundStmt const&, bool, clang::CodeGen::AggValueSlot) (/opt/compiler-explorer/clang-21.1.0/bin/clang+0x40b48f9)
#8 0x00000000041166f5 clang::CodeGen::CodeGenFunction::EmitFunctionBody(clang::Stmt const*) (/opt/compiler-explorer/clang-21.1.0/bin/clang+0x41166f5)
#9 0x000000000412a183 clang::CodeGen::CodeGenFunction::GenerateCode(clang::GlobalDecl, llvm::Function*, clang::CodeGen::CGFunctionInfo const&) (/opt/compiler-explorer/clang-21.1.0/bin/clang+0x412a183)
#10 0x0000000004184b2b clang::CodeGen::CodeGenModule::EmitGlobalFunctionDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/opt/compiler-explorer/clang-21.1.0/bin/clang+0x4184b2b)
#11 0x00000000041805b4 clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/opt/compiler-explorer/clang-21.1.0/bin/clang+0x41805b4)
#12 0x0000000004180eb3 clang::CodeGen::CodeGenModule::EmitGlobal(clang::GlobalDecl) (/opt/compiler-explorer/clang-21.1.0/bin/clang+0x4180eb3)
#13 0x000000000418aa2f clang::CodeGen::CodeGenModule::EmitTopLevelDecl(clang::Decl*) (.part.0) CodeGenModule.cpp:0:0
#14 0x000000000454c6e0 (anonymous namespace)::CodeGeneratorImpl::HandleTopLevelDecl(clang::DeclGroupRef) ModuleBuilder.cpp:0:0
#15 0x00000000045363f9 clang::BackendConsumer::HandleTopLevelDecl(clang::DeclGroupRef) (/opt/compiler-explorer/clang-21.1.0/bin/clang+0x45363f9)
#16 0x000000000618ef64 clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-21.1.0/bin/clang+0x618ef64)
#17 0x000000000454985d clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-21.1.0/bin/clang+0x454985d)
#18 0x000000000485b83a clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-21.1.0/bin/clang+0x485b83a)
#19 0x00000000047d655b clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-21.1.0/bin/clang+0x47d655b)
#20 0x000000000494e513 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-21.1.0/bin/clang+0x494e513)
#21 0x0000000000da5f25 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-21.1.0/bin/clang+0xda5f25)
#22 0x0000000000d9de2d ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#23 0x00000000045bb869 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 0x0000000003b48813 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-21.1.0/bin/clang+0x3b48813)
#25 0x00000000045bba89 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 0x000000000457eddd clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-21.1.0/bin/clang+0x457eddd)
#27 0x000000000457fd91 clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/opt/compiler-explorer/clang-21.1.0/bin/clang+0x457fd91)
#28 0x000000000458d29c clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-21.1.0/bin/clang+0x458d29c)
#29 0x0000000000da2751 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-21.1.0/bin/clang+0xda2751)
#30 0x0000000000c526f4 main (/opt/compiler-explorer/clang-21.1.0/bin/clang+0xc526f4)
#31 0x00007f9157029d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#32 0x00007f9157029e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#33 0x0000000000d9d8c5 _start (/opt/compiler-explorer/clang-21.1.0/bin/clang+0xd9d8c5)
clang: error: clang frontend command failed with exit code 139 (use -v to see invocation)
Compiler returned: 139
```
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