diff -Npur tvm/include/tvm/expr_operator.h tvm_new/include/tvm/expr_operator.h
--- tvm/include/tvm/expr_operator.h	2019-12-28 10:11:27.369814744 +0800
+++ tvm_new/include/tvm/expr_operator.h	2019-12-28 10:11:27.209812391 +0800
@@ -25,6 +25,11 @@
  *   when the type is int32 or int64 for simplifying the index expressions.
  */
 // Acknowledgement: Most operator APIs originate from Halide.
+
+/*
+ * 2019.12.30 - Add new operator for expr.
+ */
+
 #ifndef TVM_EXPR_OPERATOR_H_
 #define TVM_EXPR_OPERATOR_H_
 
@@ -217,6 +222,16 @@ TVM_DLL Expr operator*(Expr a, Expr b);
  */
 TVM_DLL Expr operator/(Expr a, Expr b);
 /*!
+ * \brief mod operator
+ *
+ * \param a left operand
+ * \param b right operand
+ * \return The result expression.
+ * \note this function does eager constant folding for
+ *       index types(int32, int64) when possible.
+ */
+TVM_DLL Expr operator%(Expr a, Expr b);
+/*!
  * \brief left shift operator
  *
  * \param a left operand
diff -Npur tvm/include/tvm/lowered_func.h tvm_new/include/tvm/lowered_func.h
--- tvm/include/tvm/lowered_func.h	2019-12-28 10:11:27.369814744 +0800
+++ tvm_new/include/tvm/lowered_func.h	2019-12-28 10:11:27.209812391 +0800
@@ -22,6 +22,11 @@
  * \brief Information about a lowered TVM function.
  *  This data structure is final step toward codegen.
  */
+
+/*
+ * 2019.12.30 - Add new var array for args_real.
+ */
+
 #ifndef TVM_LOWERED_FUNC_H_
 #define TVM_LOWERED_FUNC_H_
 
@@ -74,6 +79,7 @@ class LoweredFuncNode : public ir::Funct
    *  This function can only take pod type(int, float) and void* as arguments.
    */
   Array<Var> args;
+  Array<Var> args_real;
   /*!
    * \brief The IterVar axis of threads
    *  Each axis need host function to specify a size.