COMPMID-1717: CL: Implement Maximum, Minimum, SquaredDifference

Change-Id: Ice653e48211053bd3cd20a693bd76de6b4efc370
Reviewed-on: https://review.mlplatform.org/270
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
diff --git a/arm_compute/core/Types.h b/arm_compute/core/Types.h
index 7db2f5f..7d632fe 100644
--- a/arm_compute/core/Types.h
+++ b/arm_compute/core/Types.h
@@ -552,6 +552,17 @@
     ARG_IDX_MIN  /**< Index of the min value */
 };
 
+/** Available element-wise operations */
+enum class ArithmeticOperation
+{
+    ADD,          /**< (x + y) */
+    SUB,          /**< (x  - y) */
+    DIV,          /**< (x / y) */
+    MIN,          /**< Min(x, y) */
+    MAX,          /**< Max(x, y) */
+    SQUARED_DIFF, /**< (x - y)^2 */
+};
+
 /** The normalization type used for the normalization layer */
 enum class NormType
 {