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/*
 * ScanLargeArrays : Scan is done for each block and the sum of each
 * block is stored in separate array (sumBuffer). SumBuffer is scanned
 * and results are added to every value of next corresponding block to
 * compute the scan of a large array.(not limited to 2*MAX_GROUP_SIZE)
 * Scan uses a balanced tree algorithm. See Belloch, 1990 "Prefix Sums
 * and Their Applications"
 * @param output output data
 * @param input  input data
 * @param block  local memory used in the kernel
 * @param sumBuffer  sum of blocks
 * @param length length of the input data
 */

__kernel
void blockAddition(__global float* input, __global float* output)
{
	int globalId = get_global_id(0);
	int groupId = get_group_id(0);
	int localId = get_local_id(0);

	__local float value[1];

	/* Only 1 thread of a group will read from global buffer */
	if(localId == 0)
	{
		value[0] = input[groupId];
	}
	barrier(CLK_LOCAL_MEM_FENCE);

	output[globalId] += value[0];
}
