package cpustream;

import com.maxeler.maxcompiler.v2.kernelcompiler.Kernel;
import com.maxeler.maxcompiler.v2.kernelcompiler.KernelParameters;
import com.maxeler.maxcompiler.v2.kernelcompiler.types.base.DFEType;
import com.maxeler.maxcompiler.v2.kernelcompiler.types.base.DFEVar;

class CpuStreamKernel extends Kernel {

	private static final DFEType type1 = dfeInt(32);
	private static final DFEType type2 = dfeFloat(8, 24);
	private static final DFEType type3 = dfeUInt(4);

	protected CpuStreamKernel(KernelParameters parameters) {
		super(parameters);

		DFEVar x = io.input("x", type1);
		DFEVar N = io.scalarInput("N", type3);

		/* stream.offset nam sluzi da pogledamo prethodne ili sledece vrednosti u
		 * datom toku podataka
		 */

		/* dovoljan nam je brojac sa 4 bita jer je tok podataka najvise 16 */
		DFEVar brojac = control.count.simpleCounter(4);

		DFEVar xpre = brojac.eq(0)?0:stream.offset(x, -1);
		DFEVar xposle = brojac.eq(N-1)?0:stream.offset(x, +1);

		DFEVar sum = (brojac.eq(0) | brojac.eq(N-1))?(x + xpre+xposle).cast(type2)/2:(x+xpre+xposle).cast(type2)/3;

		io.output("s", sum, type2);
	}

}