This implements the trivial change needed to move back from the hip{Something}_{x, y, z} macros to the natural CUDA syntax of Something.{x, y, z}. This is contained in lines 384-404 in hip_runtime.h. All of the other changes have to do with changing unit tests to use this syntax. The macros are retained for backwards compatibility.

include/hip/hcc_detail/hip_runtime.h

@@ -381,6 +381,27 @@ __device__ void  __threadfence_system(void) ;
  * @}
  */
 
+template<typename std::common_type<
+    decltype(hc_get_group_id),
+    decltype(hc_get_group_size),
+    decltype(hc_get_num_groups),
+    decltype(hc_get_workitem_id)>::type f>
+class Coordinates {
+    using R = decltype(f(0));
+
+    struct X { __device__ operator R() const { return f(0); } };
+    struct Y { __device__ operator R() const { return f(1); } };
+    struct Z { __device__ operator R() const { return f(2); } };
+public:
+    static constexpr X x{};
+    static constexpr Y y{};
+    static constexpr Z z{};
+};
+
+static constexpr Coordinates<hc_get_group_size> blockDim;
+static constexpr Coordinates<hc_get_group_id> blockIdx;
+static constexpr Coordinates<hc_get_num_groups> gridDim;
+static constexpr Coordinates<hc_get_workitem_id> threadIdx;
 
 #define hipThreadIdx_x (hc_get_workitem_id(0))
 #define hipThreadIdx_y (hc_get_workitem_id(1))