| Issue |
176983
|
| Summary |
clang++ crash on constexpr simd (gnu vector extension) assignment
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
ImpleLee
|
Godbolt link: https://godbolt.org/z/G7T4vo13z .
### code
```c++
#include <cstdint>
using u64x4 [[gnu::vector_size(4 * sizeof(std::uint64_t))]] = std::uint64_t;
constexpr u64x4 f() {
u64x4 result;
result[0] = 0;
return result;
}
void g() { f(); }
```
### crash backtrace
```
Stack dump:
0. Program arguments: /opt/compiler-explorer/clang-trunk/bin/clang++ -g -o /app/output.s -fno-verbose-asm -S --gcc-toolchain=/opt/compiler-explorer/gcc-snapshot -fcolor-diagnostics -fno-crash-diagnostics <source>
1. <source>:11:1: current parser token 'void'
2. <source>:5:21: parsing function body 'f'
#0 0x0000000003d58c08 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3d58c08)
#1 0x0000000003d565fc llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3d565fc)
#2 0x0000000003c9ba78 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x000070f9c8442520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x000070f9c88c6603 std::_Rb_tree_decrement(std::_Rb_tree_node_base const*) (/lib/x86_64-linux-gnu/libstdc++.so.6+0xc6603)
#5 0x000000000750522e (anonymous namespace)::LValueExprEvaluator::VisitVarDecl(clang::Expr const*, clang::VarDecl const*) ExprConstant.cpp:0:0
#6 0x000000000753e05a (anonymous namespace)::LValueExprEvaluator::VisitDeclRefExpr(clang::DeclRefExpr const*) ExprConstant.cpp:0:0
#7 0x0000000007539736 clang::StmtVisitorBase<llvm::make_const_ptr, (anonymous namespace)::LValueExprEvaluator, bool>::Visit(clang::Stmt const*) ExprConstant.cpp:0:0
#8 0x0000000007577794 (anonymous namespace)::VectorExprEvaluator::VisitCastExpr(clang::CastExpr const*) ExprConstant.cpp:0:0
#9 0x0000000007578064 clang::StmtVisitorBase<llvm::make_const_ptr, (anonymous namespace)::VectorExprEvaluator, bool>::Visit(clang::Stmt const*) ExprConstant.cpp:0:0
#10 0x0000000007523f6a Evaluate(clang::APValue&, (anonymous namespace)::EvalInfo&, clang::Expr const*) ExprConstant.cpp:0:0
#11 0x0000000007565882 EvaluateStmt((anonymous namespace)::StmtResult&, (anonymous namespace)::EvalInfo&, clang::Stmt const*, clang::SwitchCase const*) (.part.0) ExprConstant.cpp:0:0
#12 0x0000000007564be8 EvaluateStmt((anonymous namespace)::StmtResult&, (anonymous namespace)::EvalInfo&, clang::Stmt const*, clang::SwitchCase const*) (.part.0) ExprConstant.cpp:0:0
#13 0x000000000756ab2e HandleFunctionCall(clang::SourceLocation, clang::FunctionDecl const*, (anonymous namespace)::LValue const*, clang::Expr const*, llvm::ArrayRef<clang::Expr const*>, (anonymous namespace)::CallRef, clang::Stmt const*, (anonymous namespace)::EvalInfo&, clang::APValue&, (anonymous namespace)::LValue const*) (.isra.0) ExprConstant.cpp:0:0
#14 0x0000000007574b2e clang::Expr::isPotentialConstantExpr(clang::FunctionDecl const*, llvm::SmallVectorImpl<std::pair<clang::SourceLocation, clang::PartialDiagnostic>>&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x7574b2e)
#15 0x000000000671c326 clang::Sema::CheckConstexprFunctionDefinition(clang::FunctionDecl const*, clang::Sema::CheckConstexprKind) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x671c326)
#16 0x00000000066a883a clang::Sema::ActOnFinishFunctionBody(clang::Decl*, clang::Stmt*, bool, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x66a883a)
#17 0x00000000063d04b4 clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x63d04b4)
#18 0x00000000062bad9b clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x62bad9b)
#19 0x000000000630775f clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::ParsedAttributes&, clang::Parser::ParsedTemplateInfo&, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x630775f)
#20 0x00000000062b4187 clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x62b4187)
#21 0x00000000062b4927 clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x62b4927)
#22 0x00000000062bd2ef clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x62bd2ef)
#23 0x00000000062beaf7 clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x62beaf7)
#24 0x000000000629793a clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x629793a)
#25 0x000000000462afd5 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x462afd5)
#26 0x000000000493f08a clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x493f08a)
#27 0x00000000048bcceb clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x48bcceb)
#28 0x0000000004a3530b clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x4a3530b)
#29 0x0000000000de0d0d cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0xde0d0d)
#30 0x0000000000dd8b3b ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>) driver.cpp:0:0
#31 0x0000000000dd8bdd 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
#32 0x00000000046a5bb9 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
#33 0x0000000003c9be93 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3c9be93)
#34 0x00000000046a5dd9 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
#35 0x0000000004668ec2 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-trunk/bin/clang+++0x4668ec2)
#36 0x0000000004669da1 clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/opt/compiler-explorer/clang-trunk/bin/clang+++0x4669da1)
#37 0x000000000467289c clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x467289c)
#38 0x0000000000ddd609 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0xddd609)
#39 0x0000000000c92984 main (/opt/compiler-explorer/clang-trunk/bin/clang+++0xc92984)
#40 0x000070f9c8429d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#41 0x000070f9c8429e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#42 0x0000000000dd85d5 _start (/opt/compiler-explorer/clang-trunk/bin/clang+++0xdd85d5)
clang++: error: clang frontend command failed with exit code 139 (use -v to see invocation)
Compiler returned: 139
```
### comments
Crash starts from clang++-20, and the current trunk still crashes. The assignment seems to be the key. Clang++ does not crash if the assignment is removed.
![]()
_______________________________________________
llvm-bugs mailing list
[email protected]
https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-bugs
