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#ifdef KHR_DP_EXTENSION
#pragma OPENCL EXTENSION cl_khr_fp64 : enable
#else
#pragma OPENCL EXTENSION cl_amd_fp64 : enable
#endif

#define VECTOR_SIZE 4


/* Kernel to decompose the matrix in LU parts
    input taken from inlacematrix
    param d tells which iteration of the kernel is executing
    output matrix U is generated in the inplacematrix itself
    output matrix L is generated in the LMatrix*/
#if mykernel == 1

__kernel void kernelLUDecompose(__global double4* LMatrix,
                           __global double4* inplaceMatrix,
                            int d,
                            __local double* ratio)
{	
	  __requires(d == 1); //< previously, 0 <= d <= 15

    //get the global id of the work item
    int y = get_global_id(1);
    int x = get_global_id(0);
    int lidx = get_local_id(0);
    int lidy = get_local_id(1);
    //the range in x axis is dimension / 4
    int xdimension = get_global_size(0) + d / VECTOR_SIZE;
    int D = d % VECTOR_SIZE;
    //printf(" Thread ID %d %d local ID %d  %d\n",x,y,lidx,lidy);
    if(get_local_id(0) == 0)
    {
        
        //ratio needs to be calculated only once per workitem
        (D == 0) ? (ratio[lidy] = inplaceMatrix[ y * xdimension + d / VECTOR_SIZE].s0 / inplaceMatrix[ d * xdimension + d / VECTOR_SIZE].s0):1;
        (D == 1) ? (ratio[lidy] = inplaceMatrix[ y * xdimension + d / VECTOR_SIZE].s1 / inplaceMatrix[ d * xdimension + d / VECTOR_SIZE].s1):1;
        (D == 2) ? (ratio[lidy] = inplaceMatrix[ y * xdimension + d / VECTOR_SIZE].s2 / inplaceMatrix[ d * xdimension + d / VECTOR_SIZE].s2):1;
        (D == 3) ? (ratio[lidy] = inplaceMatrix[ y * xdimension + d / VECTOR_SIZE].s3 / inplaceMatrix[ d * xdimension + d / VECTOR_SIZE].s3):1;
    }
    
    // REVISIT: original had bug
//#define ORIGINAL
#ifdef ORIGINAL
    barrier(CLK_LOCAL_MEM_FENCE);
#else
    barrier(CLK_LOCAL_MEM_FENCE | CLK_GLOBAL_MEM_FENCE);
#endif
    
    //check which workitems need to be included for computation
    if(y >= d + 1 && ((x + 1) * VECTOR_SIZE) > d)
    {
        double4 result;
        
        //the vectorized part begins here
        {
            result.s0 = inplaceMatrix[y * xdimension + x].s0 - ratio[lidy] * inplaceMatrix[ d * xdimension + x].s0;
            result.s1 = inplaceMatrix[y * xdimension + x].s1 - ratio[lidy] * inplaceMatrix[ d * xdimension + x].s1;
            result.s2 = inplaceMatrix[y * xdimension + x].s2 - ratio[lidy] * inplaceMatrix[ d * xdimension + x].s2;
            result.s3 = inplaceMatrix[y * xdimension + x].s3 - ratio[lidy] * inplaceMatrix[ d * xdimension + x].s3;
        }
        
        
        if(x == d / VECTOR_SIZE)
        {
            (D == 0) ? (LMatrix[y * xdimension + x].s0 = ratio[lidy]) : (inplaceMatrix[y * xdimension + x].s0 = result.s0);
            (D == 1) ? (LMatrix[y * xdimension + x].s1 = ratio[lidy]) : (inplaceMatrix[y * xdimension + x].s1 = result.s1);
            (D == 2) ? (LMatrix[y * xdimension + x].s2 = ratio[lidy]) : (inplaceMatrix[y * xdimension + x].s2 = result.s2);
            (D == 3) ? (LMatrix[y * xdimension + x].s3 = ratio[lidy]) : (inplaceMatrix[y * xdimension + x].s3 = result.s3);
        }
        else
        {
            inplaceMatrix[y * xdimension + x].s0 = result.s0;
            inplaceMatrix[y * xdimension + x].s1 = result.s1;
            inplaceMatrix[y * xdimension + x].s2 = result.s2;
            inplaceMatrix[y * xdimension + x].s3 = result.s3;
        }
    }
}


/*	This function will combine L & U into 1 matrix
    param: inplace matrix contains the U matrix generated by above kernel
    param: LMatrix contains L MAtrix
    The kernel will combine them together as one matrix
    We ignore the diagonal elements of LMatrix during this as 
    they will all be zero
    */
#endif
#if mykernel == 2

__kernel void kernelLUCombine(__global double* LMatrix,
                         __global double* inplaceMatrix)
{
    int i = get_global_id(1);
    int j = get_global_id(0);
    int gidx = get_group_id(0);
    int gidy = get_group_id(1);
    int dimension = get_global_size(0);
    if(i>j )
    {
        int dimension = get_global_size(0);
        inplaceMatrix[i * dimension + j] = LMatrix[i * dimension + j];
    }
}

#endif
