| /************************************************************************************\ |
| * * |
| * Copyright � 2014 Advanced Micro Devices, Inc. * |
| * Copyright (c) 2015 Mark D. Hill and David A. Wood * |
| * Copyright (c) 2021 Gaurav Jain and Matthew D. Sinclair * |
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| \************************************************************************************/ |
| |
| #ifndef KERNEL_MAXMIN_H |
| #define KERNEL_MAXMIN_H |
| |
| #include "hip/hip_runtime.h" |
| |
| #define BIG_NUM 999999 |
| |
| /** |
| * @brief color kernel 1 |
| * @param row CSR pointer array |
| * @param col CSR column array |
| * @param node_value Vertex value array |
| * @param color_array Color value array |
| * @param stop Termination variable |
| * @param max_d Max array |
| * @param max_d Min array |
| * @param color Current color label |
| * @param num_nodes Number of vertices |
| * @param num_edges Number of edges |
| */ |
| __global__ void color1(int *row, int *col, int *node_value, int *color_array, |
| int *stop, int *max_d, int *min_d, const int color, |
| const int num_nodes, const int num_edges) |
| { |
| // Get my workitem id |
| int tid = blockIdx.x * blockDim.x + threadIdx.x; |
| |
| if (tid < num_nodes) { |
| // If the vertex is not colored |
| if (color_array[tid] == -1) { |
| |
| // Get the start and end pointers for the neighbor list |
| int start = row[tid]; |
| int end; |
| if (tid + 1 < num_nodes) |
| end = row[tid + 1]; |
| else |
| end = num_edges; |
| |
| int maximum = -1; |
| int minimum = BIG_NUM; |
| // Navigate the neighborlist |
| for (int edge = start; edge < end; edge++) { |
| if (color_array[col[edge]] == -1 && start != end - 1) { |
| *stop = 1; |
| // Determine if the vertex value is the maximum/minimum in the neighborhood |
| if (node_value[col[edge]] > maximum) |
| maximum = node_value[col[edge]]; |
| if (node_value[col[edge]] < minimum) |
| minimum = node_value[col[edge]]; |
| } |
| } |
| // Assign the maximum/miminum value to max/min array |
| max_d[tid] = maximum; |
| min_d[tid] = minimum; |
| } |
| } |
| } |
| |
| /** |
| * @brief color kernel 2 |
| * @param node_value Vertex value array |
| * @param color_array Color value array |
| * @param max_d Max array |
| * @param min_d Min array |
| * @param color Current color label |
| * @param num_nodes Number of vertices |
| * @param num_edges Number of edges |
| */ |
| __global__ void color2(int *node_value, int *color_array, int *max_d, |
| int *min_d, const int color, const int num_nodes, |
| const int num_edges) |
| { |
| // Get my workitem id |
| int tid = blockIdx.x * blockDim.x + threadIdx.x; |
| |
| if (tid < num_nodes) { |
| // If the vertex is still not colored |
| if (color_array[tid] == -1) { |
| // Assign a color |
| if (node_value[tid] >= max_d[tid]) |
| color_array[tid] = color; |
| if (node_value[tid] <= min_d[tid]) |
| color_array[tid] = color + 1; |
| } |
| } |
| |
| } |
| |
| /** |
| * @brief init kernel |
| * @param max_d Max array |
| * @param min_d Min array |
| * @param num_nodes Number of vertices |
| */ |
| __global__ void ini(int *max_d, int *min_d, const int num_nodes) |
| { |
| // Get my workitem id |
| int tid = blockIdx.x * blockDim.x + threadIdx.x; |
| |
| // Initialize max: -1 and min: Big_num |
| if (tid < num_nodes) { |
| max_d[tid] = -1; |
| min_d[tid] = BIG_NUM; |
| } |
| |
| } |
| |
| #endif |