Open
Description
Reproducer:
https://godbolt.org/z/b387aMKxa
void f(long double ld) {
#pragma omp atomic compare
ld = ld == 0.0L ? 1.0L : ld;
}The original reproducer of this issue is the following:
https://github.com/gcc-mirror/gcc/blob/master/libgomp/testsuite/libgomp.c-c%2B%2B-common/atomic-21.c
Backtrace:
clang++: /root/llvm-project/llvm/include/llvm/Support/Alignment.h:78: llvm::Align::Align(uint64_t): Assertion `llvm::isPowerOf2_64(Value) && "Alignment is not a power of 2"' failed.
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++ -gdwarf-4 -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 -fopenmp <source>
1. <eof> parser at end of file
2. Per-file LLVM IR generation
3. <source>:1:6: Generating code for declaration 'f'
#0 0x0000000003f99d48 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3f99d48)
#1 0x0000000003f979d4 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3f979d4)
#2 0x0000000003edc608 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x0000707d17242520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x0000707d172969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
#5 0x0000707d17242476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
#6 0x0000707d172287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
#7 0x0000707d1722871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
#8 0x0000707d17239e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
#9 0x0000000000ec4e6f llvm::Align::Align(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xec4e6f)
#10 0x00000000030b5dea llvm::IRBuilderBase::CreateAtomicCmpXchg(llvm::Value*, llvm::Value*, llvm::Value*, llvm::MaybeAlign, llvm::AtomicOrdering, llvm::AtomicOrdering, unsigned char) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x30b5dea)
#11 0x0000000008011616 llvm::OpenMPIRBuilder::createAtomicCompare(llvm::OpenMPIRBuilder::LocationDescription const&, llvm::OpenMPIRBuilder::AtomicOpValue&, llvm::OpenMPIRBuilder::AtomicOpValue&, llvm::OpenMPIRBuilder::AtomicOpValue&, llvm::Value*, llvm::Value*, llvm::AtomicOrdering, llvm::omp::OMPAtomicCompareOp, bool, bool, bool, llvm::AtomicOrdering) (.part.0) OMPIRBuilder.cpp:0:0
#12 0x00000000080120be llvm::OpenMPIRBuilder::createAtomicCompare(llvm::OpenMPIRBuilder::LocationDescription const&, llvm::OpenMPIRBuilder::AtomicOpValue&, llvm::OpenMPIRBuilder::AtomicOpValue&, llvm::OpenMPIRBuilder::AtomicOpValue&, llvm::Value*, llvm::Value*, llvm::AtomicOrdering, llvm::omp::OMPAtomicCompareOp, bool, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x80120be)
#13 0x00000000044c8ee4 clang::CodeGen::CodeGenFunction::EmitOMPAtomicDirective(clang::OMPAtomicDirective const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x44c8ee4)
#14 0x000000000447a66e clang::CodeGen::CodeGenFunction::EmitStmt(clang::Stmt const*, llvm::ArrayRef<clang::Attr const*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x447a66e)
#15 0x00000000044823cc clang::CodeGen::CodeGenFunction::EmitCompoundStmtWithoutScope(clang::CompoundStmt const&, bool, clang::CodeGen::AggValueSlot) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x44823cc)
#16 0x00000000044e8586 clang::CodeGen::CodeGenFunction::EmitFunctionBody(clang::Stmt const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x44e8586)
#17 0x00000000044fba0b clang::CodeGen::CodeGenFunction::GenerateCode(clang::GlobalDecl, llvm::Function*, clang::CodeGen::CGFunctionInfo const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x44fba0b)
#18 0x00000000045659d5 clang::CodeGen::CodeGenModule::EmitGlobalFunctionDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x45659d5)
#19 0x0000000004560b44 clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4560b44)
#20 0x000000000456d347 clang::CodeGen::CodeGenModule::EmitDeferred() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x456d347)
#21 0x000000000456f8d3 clang::CodeGen::CodeGenModule::Release() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x456f8d3)
#22 0x000000000494840e (anonymous namespace)::CodeGeneratorImpl::HandleTranslationUnit(clang::ASTContext&) ModuleBuilder.cpp:0:0
#23 0x0000000004944825 clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4944825)
#24 0x000000000662d34c clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x662d34c)
#25 0x0000000004944fd8 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4944fd8)
#26 0x0000000004c3cea5 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4c3cea5)
#27 0x0000000004bbbb3e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4bbbb3e)
#28 0x0000000004d30a49 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4d30a49)
#29 0x0000000000dac29f cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xdac29f)
#30 0x0000000000da246a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#31 0x00000000049ac2c9 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
#32 0x0000000003edcaa4 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3edcaa4)
#33 0x00000000049ac8df 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
#34 0x000000000496e6ad clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x496e6ad)
#35 0x000000000496f73e 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+++0x496f73e)
#36 0x0000000004977a25 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4977a25)
#37 0x0000000000da8208 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xda8208)
#38 0x0000000000c2df44 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xc2df44)
#39 0x0000707d17229d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#40 0x0000707d17229e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#41 0x0000000000da1f15 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xda1f15)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134