[LLVMbugs] [Bug 1695] New: ScheduleDAGSimple:: isStrongDependency uses an uninitialized value

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=1695

           Summary: ScheduleDAGSimple::isStrongDependency uses an
                    uninitialized value
           Product: new-bugs
           Version: unspecified
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: baldrick at free.fr
                CC: llvmbugs at cs.uiuc.edu


Running test/CodeGen/Generic/2006-07-03-schedulers.ll under valgrind gives:

Conditional jump or move depends on uninitialised value(s)
   at 0x85E9018: (anonymous
namespace)::ScheduleDAGSimple::isStrongDependency((anonymous
namespace)::NodeInfo*, (anonymous namespace)::NodeInfo*)
(ScheduleDAGSimple.cpp:960)
   by 0x85E929D: (anonymous namespace)::ScheduleDAGSimple::ScheduleBackward()
(ScheduleDAGSimple.cpp:998)
   by 0x85EA80B: (anonymous namespace)::ScheduleDAGSimple::Schedule()
(ScheduleDAGSimple.cpp:1126)
   by 0x8675363: llvm::ScheduleDAG::Run() (ScheduleDAG.cpp:834)
   by 0x860B240:
llvm::SelectionDAGISel::ScheduleAndEmitDAG(llvm::SelectionDAG&)
(SelectionDAGISel.cpp:4870)
   by 0x8546DE5: (anonymous
namespace)::X86DAGToDAGISel::InstructionSelectBasicBlock(llvm::SelectionDAG&)
(X86ISelDAGToDAG.cpp:479)
   by 0x860B3CE: llvm::SelectionDAGISel::CodeGenAndEmitDAG(llvm::SelectionDAG&)
(SelectionDAGISel.cpp:4646)
   by 0x861F5D2: llvm::SelectionDAGISel::SelectBasicBlock(llvm::BasicBlock*,
llvm::MachineFunction&, llvm::FunctionLoweringInfo&)
(SelectionDAGISel.cpp:4664)
   by 0x8621211: llvm::SelectionDAGISel::runOnFunction(llvm::Function&)
(SelectionDAGISel.cpp:4365)
   by 0x84A02E0: (anonymous
namespace)::X86DAGToDAGISel::runOnFunction(llvm::Function&)
(X86ISelDAGToDAG.cpp:122)
   by 0x8822027: llvm::FPPassManager::runOnFunction(llvm::Function&)
(PassManager.cpp:1168)
   by 0x8822285: llvm::FunctionPassManagerImpl::run(llvm::Function&)
(PassManager.cpp:1126)

Conditional jump or move depends on uninitialised value(s)
   at 0x85E9018: (anonymous
namespace)::ScheduleDAGSimple::isStrongDependency((anonymous
namespace)::NodeInfo*, (anonymous namespace)::NodeInfo*)
(ScheduleDAGSimple.cpp:960)
   by 0x85E90C7: (anonymous namespace)::ScheduleDAGSimple::ScheduleForward()
(ScheduleDAGSimple.cpp:1055)
   by 0x85EA816: (anonymous namespace)::ScheduleDAGSimple::Schedule()
(ScheduleDAGSimple.cpp:1129)
   by 0x8675363: llvm::ScheduleDAG::Run() (ScheduleDAG.cpp:834)
   by 0x860B240:
llvm::SelectionDAGISel::ScheduleAndEmitDAG(llvm::SelectionDAG&)
(SelectionDAGISel.cpp:4870)
   by 0x8546DE5: (anonymous
namespace)::X86DAGToDAGISel::InstructionSelectBasicBlock(llvm::SelectionDAG&)
(X86ISelDAGToDAG.cpp:479)
   by 0x860B3CE: llvm::SelectionDAGISel::CodeGenAndEmitDAG(llvm::SelectionDAG&)
(SelectionDAGISel.cpp:4646)
   by 0x861F5D2: llvm::SelectionDAGISel::SelectBasicBlock(llvm::BasicBlock*,
llvm::MachineFunction&, llvm::FunctionLoweringInfo&)
(SelectionDAGISel.cpp:4664)
   by 0x8621211: llvm::SelectionDAGISel::runOnFunction(llvm::Function&)
(SelectionDAGISel.cpp:4365)
   by 0x84A02E0: (anonymous
namespace)::X86DAGToDAGISel::runOnFunction(llvm::Function&)
(X86ISelDAGToDAG.cpp:122)
   by 0x8822027: llvm::FPPassManager::runOnFunction(llvm::Function&)
(PassManager.cpp:1168)
   by 0x8822285: llvm::FunctionPassManagerImpl::run(llvm::Function&)
(PassManager.cpp:1126)

Reproduce using:
  llvm-upgrade 2006-07-03-schedulers.ll | llvm-as | valgrind --tool=memcheck
llc -pre-RA-sched=simple > /dev/null


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