[LLVMbugs] [Bug 14442] New: __int128 atomic hangs compiler

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=14442

             Bug #: 14442
           Summary: __int128 atomic hangs compiler
           Product: new-bugs
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: dvyukov at google.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


$ clang++ -v
clang version 3.3 (trunk 168584)
Target: x86_64-unknown-linux-gnu
Thread model: posix

$ cat /tmp/test.cc
int main() {
    __int128 a;
    __sync_fetch_and_add(&a, 1);
}

$ clang++ /tmp/test.cc
[burns 100% CPU and hangs forever in]

#0  0x0000000000b943df in llvm::DAGTypeLegalizer::ExpandAtomic(llvm::SDNode*)
()
#1  0x0000000000bacf42 in
llvm::DAGTypeLegalizer::ExpandIntegerResult(llvm::SDNode*, unsigned int) ()
#2  0x0000000000b3f40c in llvm::SelectionDAG::LegalizeTypes() ()
#3  0x0000000000aee1a9 in llvm::SelectionDAGISel::CodeGenAndEmitDAG() ()
#4  0x0000000000af4e4e in
llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) ()
#5  0x0000000000af5fb8 in
llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) ()
#6  0x00000000010f024c in llvm::FPPassManager::runOnFunction(llvm::Function&)
()
#7  0x00000000010f02f3 in llvm::FPPassManager::runOnModule(llvm::Module&) ()
#8  0x00000000010efe66 in llvm::MPPassManager::runOnModule(llvm::Module&) ()
#9  0x00000000010effa2 in llvm::PassManagerImpl::run(llvm::Module&) ()
#10 0x00000000011e886a in clang::EmitBackendOutput(clang::DiagnosticsEngine&,
clang::CodeGenOptions const&, clang::TargetOptions const&, clang::LangOptions
const&, llvm::Module*, clang::BackendAction, llvm::raw_ostream*) ()
#11 0x00000000011e61a0 in
clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) ()
#12 0x000000000146c5ee in clang::ParseAST(clang::Sema&, bool, bool) ()
#13 0x00000000013b3a81 in clang::FrontendAction::Execute() ()
#14 0x0000000001396aa0 in
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) ()
#15 0x00000000011c8aca in
clang::ExecuteCompilerInvocation(clang::CompilerInstance*) ()
#16 0x0000000000640690 in cc1_main(char const**, char const**, char const*,
void*) ()
#17 0x00000000006274a2 in main ()

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