Program: 79483
Project: 79483
Buggy source:
public void run(){
  for (  IRFunction irFunction : ir.getFuncs().values()) {
    List<BasicBlock> reversePreOrder=irFunction.getReversePreOrder();
    for (    BasicBlock bb : reversePreOrder) {
      for (IRInstruction inst=bb.getFirstInst(); inst != null; inst=inst.getNextInst()) {
        inst.liveIn=new HashSet<>();
        inst.liveOut=new HashSet<>();
      }
    }
    Set<VirtualRegister> liveIn=new HashSet<>();
    Set<VirtualRegister> liveOut=new HashSet<>();
    boolean converged=false;
    while (!converged) {
      converged=true;
      for (      BasicBlock bb : reversePreOrder) {
        for (IRInstruction inst=bb.getLastInst(); inst != null; inst=inst.getPrevInst()) {
          liveIn.clear();
          liveOut.clear();
          if (inst instanceof IRJumpInstruction) {
            if (inst instanceof IRJump) {
              liveOut.addAll(((IRJump)inst).getTargetBB().getFirstInst().liveIn);
            }
 else             if (inst instanceof IRBranch) {
              if (((IRBranch)inst).getThenBB().getFirstInst() == null) {
                System.err.println("String_Node_Str" + (((IRBranch)inst).getThenBB().getName()));
              }
              liveOut.addAll(((IRBranch)inst).getThenBB().getFirstInst().liveIn);
              liveOut.addAll(((IRBranch)inst).getElseBB().getFirstInst().liveIn);
            }
          }
 else {
            if (inst.getNextInst() != null)             liveOut.addAll(inst.getNextInst().liveIn);
          }
          liveIn.addAll(liveOut);
          IRRegister definedReg=inst.getDefinedRegister();
          if (definedReg instanceof VirtualRegister) {
            liveIn.remove(definedReg);
          }
          for (          IRRegister usedReg : inst.getUsedRegisters()) {
            if (usedReg instanceof VirtualRegister) {
              liveIn.add((VirtualRegister)usedReg);
            }
          }
          if (!inst.liveIn.equals(liveIn)) {
            converged=false;
            inst.liveIn.clear();
            inst.liveIn.addAll(liveIn);
          }
          if (!inst.liveOut.equals(liveOut)) {
            converged=false;
            inst.liveOut.clear();
            inst.liveOut.addAll(liveOut);
          }
        }
      }
    }
  }
}

Fixed version (ground truth):
public void run(){
  for (  IRFunction irFunction : ir.getFuncs().values()) {
    List<BasicBlock> reversePreOrder=irFunction.getReversePreOrder();
    for (    BasicBlock bb : reversePreOrder) {
      for (IRInstruction inst=bb.getFirstInst(); inst != null; inst=inst.getNextInst()) {
        inst.liveIn=new HashSet<>();
        inst.liveOut=new HashSet<>();
      }
    }
    Set<VirtualRegister> liveIn=new HashSet<>();
    Set<VirtualRegister> liveOut=new HashSet<>();
    boolean converged=false;
    while (!converged) {
      converged=true;
      for (      BasicBlock bb : reversePreOrder) {
        for (IRInstruction inst=bb.getLastInst(); inst != null; inst=inst.getPrevInst()) {
          liveIn.clear();
          liveOut.clear();
          if (inst instanceof IRJumpInstruction) {
            if (inst instanceof IRJump) {
              liveOut.addAll(((IRJump)inst).getTargetBB().getFirstInst().liveIn);
            }
 else             if (inst instanceof IRBranch) {
              liveOut.addAll(((IRBranch)inst).getThenBB().getFirstInst().liveIn);
              liveOut.addAll(((IRBranch)inst).getElseBB().getFirstInst().liveIn);
            }
          }
 else {
            if (inst.getNextInst() != null)             liveOut.addAll(inst.getNextInst().liveIn);
          }
          liveIn.addAll(liveOut);
          IRRegister definedReg=inst.getDefinedRegister();
          if (definedReg instanceof VirtualRegister) {
            liveIn.remove(definedReg);
          }
          for (          IRRegister usedReg : inst.getUsedRegisters()) {
            if (usedReg instanceof VirtualRegister) {
              liveIn.add((VirtualRegister)usedReg);
            }
          }
          if (!inst.liveIn.equals(liveIn)) {
            converged=false;
            inst.liveIn.clear();
            inst.liveIn.addAll(liveIn);
          }
          if (!inst.liveOut.equals(liveOut)) {
            converged=false;
            inst.liveOut.clear();
            inst.liveOut.addAll(liveOut);
          }
        }
      }
    }
  }
}