private static Exprent identifySecondaryFunctions(Exprent exprent, boolean statement_level, VarProcessor varProc) {
    if (exprent.type == Exprent.EXPRENT_FUNCTION) {
      FunctionExprent fexpr = (FunctionExprent)exprent;

      switch (fexpr.getFuncType()) {
        case FunctionExprent.FUNCTION_BOOL_NOT -> {

          Exprent retparam = propagateBoolNot(fexpr);

          if (retparam != null) {
            return retparam;
          }
        }
        case FunctionExprent.FUNCTION_EQ, FunctionExprent.FUNCTION_NE, FunctionExprent.FUNCTION_GT,
          FunctionExprent.FUNCTION_GE, FunctionExprent.FUNCTION_LT, FunctionExprent.FUNCTION_LE -> {
          Exprent expr1 = fexpr.getLstOperands().get(0);
          Exprent expr2 = fexpr.getLstOperands().get(1);

          if (expr1.type == Exprent.EXPRENT_CONST) {
            expr2 = expr1;
            expr1 = fexpr.getLstOperands().get(1);
          }

          if (expr1.type == Exprent.EXPRENT_FUNCTION && expr2.type == Exprent.EXPRENT_CONST) {
            FunctionExprent funcexpr = (FunctionExprent)expr1;
            ConstExprent cexpr = (ConstExprent)expr2;

            int functype = funcexpr.getFuncType();
            if (functype == FunctionExprent.FUNCTION_LCMP || functype == FunctionExprent.FUNCTION_FCMPG ||
                functype == FunctionExprent.FUNCTION_FCMPL || functype == FunctionExprent.FUNCTION_DCMPG ||
                functype == FunctionExprent.FUNCTION_DCMPL) {

              int desttype = -1;

              Integer[] destcons = mapNumComparisons.get(fexpr.getFuncType());
              if (destcons != null) {
                int index = cexpr.getIntValue() + 1;
                if (index >= 0 && index <= 2) {
                  Integer destcon = destcons[index];
                  if (destcon != null) {
                    desttype = destcon;
                  }
                }
              }

              if (desttype >= 0) {
                if (functype != FunctionExprent.FUNCTION_LCMP) {
                  boolean oneForNan = functype == FunctionExprent.FUNCTION_DCMPL || functype == FunctionExprent.FUNCTION_FCMPL;
                  boolean trueForOne = desttype == FunctionExprent.FUNCTION_LT || desttype == FunctionExprent.FUNCTION_LE;
                  boolean trueForNan = oneForNan == trueForOne;
                  if (trueForNan) {
                    List<Exprent> operands = new ArrayList<>();
                    operands.add(new FunctionExprent(funcsnot[desttype - FunctionExprent.FUNCTION_EQ],
                                                     funcexpr.getLstOperands(), funcexpr.bytecode));
                    return new FunctionExprent(FunctionExprent.FUNCTION_BOOL_NOT, operands, funcexpr.bytecode);
                  }
                }
                return new FunctionExprent(desttype, funcexpr.getLstOperands(), funcexpr.bytecode);
              }
            }
          }
        }
      }
    }


    boolean replaced = true;
    while (replaced) {
      replaced = false;

      for (Exprent expr : exprent.getAllExprents()) {
        Exprent retexpr = identifySecondaryFunctions(expr, false, varProc);
        if (retexpr != null) {
          exprent.replaceExprent(expr, retexpr);
          replaced = true;
          break;
        }
      }
    }

    switch (exprent.type) {
      case Exprent.EXPRENT_FUNCTION -> {
        FunctionExprent fexpr = (FunctionExprent)exprent;
        List<Exprent> lstOperands = fexpr.getLstOperands();

        switch (fexpr.getFuncType()) {
          case FunctionExprent.FUNCTION_XOR -> {
            for (int i = 0; i < 2; i++) {
              Exprent operand = lstOperands.get(i);
              VarType operandtype = operand.getExprType();

              if (operand.type == Exprent.EXPRENT_CONST &&
                  operandtype.getType() != CodeConstants.TYPE_BOOLEAN) {
                ConstExprent cexpr = (ConstExprent)operand;
                long val;
                if (operandtype.getType() == CodeConstants.TYPE_LONG) {
                  val = (Long)cexpr.getValue();
                }
                else {
                  val = (Integer)cexpr.getValue();
                }

                if (val == -1) {
                  List<Exprent> lstBitNotOperand = new ArrayList<>();
                  lstBitNotOperand.add(lstOperands.get(1 - i));
                  return new FunctionExprent(FunctionExprent.FUNCTION_BIT_NOT, lstBitNotOperand, fexpr.bytecode);
                }
              }
            }
          }
          case FunctionExprent.FUNCTION_EQ, FunctionExprent.FUNCTION_NE -> {
            if (lstOperands.get(0).getExprType().getType() == CodeConstants.TYPE_BOOLEAN &&
                lstOperands.get(1).getExprType().getType() == CodeConstants.TYPE_BOOLEAN) {
              for (int i = 0; i < 2; i++) {
                if (lstOperands.get(i).type == Exprent.EXPRENT_CONST) {
                  ConstExprent cexpr = (ConstExprent)lstOperands.get(i);
                  int val = (Integer)cexpr.getValue();

                  if ((fexpr.getFuncType() == FunctionExprent.FUNCTION_EQ && val == 1) ||
                      (fexpr.getFuncType() == FunctionExprent.FUNCTION_NE && val == 0)) {
                    return lstOperands.get(1 - i);
                  }
                  else {
                    List<Exprent> lstNotOperand = new ArrayList<>();
                    lstNotOperand.add(lstOperands.get(1 - i));
                    return new FunctionExprent(FunctionExprent.FUNCTION_BOOL_NOT, lstNotOperand, fexpr.bytecode);
                  }
                }
              }
            }
          }
          case FunctionExprent.FUNCTION_BOOL_NOT -> {
            if (lstOperands.get(0).type == Exprent.EXPRENT_CONST) {
              int val = ((ConstExprent)lstOperands.get(0)).getIntValue();
              if (val == 0) {
                return new ConstExprent(VarType.VARTYPE_BOOLEAN, 1, fexpr.bytecode);
              }
              else {
                return new ConstExprent(VarType.VARTYPE_BOOLEAN, 0, fexpr.bytecode);
              }
            }
          }
          case FunctionExprent.FUNCTION_IIF -> {
            Exprent expr1 = lstOperands.get(1);
            Exprent expr2 = lstOperands.get(2);

            if (expr1.type == Exprent.EXPRENT_CONST && expr2.type == Exprent.EXPRENT_CONST) {
              ConstExprent cexpr1 = (ConstExprent)expr1;
              ConstExprent cexpr2 = (ConstExprent)expr2;

              if (cexpr1.getExprType().getType() == CodeConstants.TYPE_BOOLEAN &&
                  cexpr2.getExprType().getType() == CodeConstants.TYPE_BOOLEAN) {

                if (cexpr1.getIntValue() == 0 && cexpr2.getIntValue() != 0) {
                  return new FunctionExprent(FunctionExprent.FUNCTION_BOOL_NOT, lstOperands.get(0), fexpr.bytecode);
                }
                else if (cexpr1.getIntValue() != 0 && cexpr2.getIntValue() == 0) {
                  return lstOperands.get(0);
                }
              }
            }
          }
          case FunctionExprent.FUNCTION_LCMP, FunctionExprent.FUNCTION_FCMPL, FunctionExprent.FUNCTION_FCMPG, FunctionExprent.FUNCTION_DCMPL, FunctionExprent.FUNCTION_DCMPG -> {
            int var = DecompilerContext.getCounterContainer().getCounterAndIncrement(CounterContainer.VAR_COUNTER);
            VarType type = lstOperands.get(0).getExprType();

            FunctionExprent iff = new FunctionExprent(FunctionExprent.FUNCTION_IIF, Arrays.asList(
              new FunctionExprent(FunctionExprent.FUNCTION_LT, Arrays.asList(new VarExprent(var, type, varProc),
                                                                             ConstExprent.getZeroConstant(type.getType())), null),
              new ConstExprent(VarType.VARTYPE_INT, -1, null),
              new ConstExprent(VarType.VARTYPE_INT, 1, null)), null);

            FunctionExprent head = new FunctionExprent(FunctionExprent.FUNCTION_EQ, Arrays.asList(
              new AssignmentExprent(new VarExprent(var, type, varProc),
                                    new FunctionExprent(FunctionExprent.FUNCTION_SUB, Arrays.asList(lstOperands.get(0), lstOperands.get(1)),
                                                        null),
                                    null),
              ConstExprent.getZeroConstant(type.getType())), null);

            varProc.setVarType(new VarVersionPair(var, 0), type);

            return new FunctionExprent(FunctionExprent.FUNCTION_IIF, Arrays.asList(
              head, new ConstExprent(VarType.VARTYPE_INT, 0, null), iff), fexpr.bytecode);
          }
        }
      }
      case Exprent.EXPRENT_ASSIGNMENT -> { // check for conditional assignment
        AssignmentExprent asexpr = (AssignmentExprent)exprent;
        Exprent right = asexpr.getRight();
        Exprent left = asexpr.getLeft();

        if (right.type == Exprent.EXPRENT_FUNCTION) {
          FunctionExprent func = (FunctionExprent)right;

          VarType midlayer = null;
          if (func.getFuncType() >= FunctionExprent.FUNCTION_I2L &&
              func.getFuncType() <= FunctionExprent.FUNCTION_I2S) {
            right = func.getLstOperands().get(0);
            midlayer = func.getSimpleCastType();
            if (right.type == Exprent.EXPRENT_FUNCTION) {
              func = (FunctionExprent)right;
            }
            else {
              return null;
            }
          }

          List<Exprent> lstFuncOperands = func.getLstOperands();

          Exprent cond = null;

          switch (func.getFuncType()) {
            case FunctionExprent.FUNCTION_ADD:
            case FunctionExprent.FUNCTION_AND:
            case FunctionExprent.FUNCTION_OR:
            case FunctionExprent.FUNCTION_XOR:
              if (left.equals(lstFuncOperands.get(1))) {
                cond = lstFuncOperands.get(0);
                break;
              }
            case FunctionExprent.FUNCTION_SUB:
            case FunctionExprent.FUNCTION_MUL:
            case FunctionExprent.FUNCTION_DIV:
            case FunctionExprent.FUNCTION_REM:
            case FunctionExprent.FUNCTION_SHL:
            case FunctionExprent.FUNCTION_SHR:
            case FunctionExprent.FUNCTION_USHR:
              if (left.equals(lstFuncOperands.get(0))) {
                cond = lstFuncOperands.get(1);
              }
          }

          if (cond != null && (midlayer == null || midlayer.equals(cond.getExprType()))) {
            asexpr.setRight(cond);
            asexpr.setCondType(func.getFuncType());
          }
        }
      }
      case Exprent.EXPRENT_INVOCATION -> {
        if (!statement_level) { // simplify if exprent is a real expression. The opposite case is pretty absurd, can still happen however (and happened at least once).
          Exprent retexpr = ConcatenationHelper.contractStringConcat(exprent);
          if (!exprent.equals(retexpr)) {
            return retexpr;
          }
        }
      }
    }

    return null;
  }
private static Exprent identifySecondaryFunctions(Exprent exprent, boolean statement_level, VarProcessor varProc)