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 *                                                                                  *
 * 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_H
#define KERNEL_H

#include "hip/hip_runtime.h"

/**
 * @brief   naive floyd warshal kernel
 * @param   dist  Distance array
 * @param   next  Next array
 * @param   dim   Dimension of the 2-D matrix
 * @param   k     Current iteration number
 */
__global__ void
floydwarshall(int *dist, int *next, int dim, int k)
{
    // Get my workitem id x_dim
    int i = hipBlockDim_x * hipBlockIdx_x + hipThreadIdx_x;
    // Get my workitem id y_dim
    int j = hipBlockDim_y * hipBlockIdx_y + hipThreadIdx_y;

    if (i < dim && j < dim) {
        // if (dist i -> k + k -> j) update the dist i-> j
        if (dist[i * dim + k] + dist[k * dim + j] < dist[i * dim + j]) {
            dist[i * dim + j] = dist[i * dim + k] + dist[k * dim + j];
            next[i * dim + j] = k;
        }
    }
}

#endif // KERNEL_H