Multiplication.java

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package datapath.graph.operations;

import datapath.graph.ModlibWriter;
import datapath.graph.OperationVisitor;
import datapath.graph.type.Type;

/**
 *
 * @author jh
 */
public class Multiplication extends BinaryOperation {

    @Override
    public String getDisplayLabel() {
        return "MULT";
    }

    public void visit(OperationVisitor visitor) {
        visitor.visit(this);
    }

    @Override
    public int getDelay() {
        Type type = getType();
        int delay = super.getDelay();
        if (type instanceof datapath.graph.type.Float) {
            delay = (type.getBitsize() == 32 ? 8 : 10); //- getStageDelay();
        }

        if (ModlibWriter.mul_pipe) {
            if (ModlibWriter.mul_pipe_create) {
                if (lhs.getOutputBitsize() <= 64 && rhs.getOutputBitsize() <= 64 &&
                        getOutputBitsize() <= 128) {
                    delay = 32 - Integer.numberOfLeadingZeros(((lhs.getOutputBitsize() +
                            15) / 16) - 1) + 32 - Integer.numberOfLeadingZeros(
                            ((rhs.getOutputBitsize() + 15) / 16) - 1) + 2;

//                    if (lhs.getOutputBitsize() <= 16 &&
//                            rhs.getOutputBitsize() <= 16 &&
//                            getOutputBitsize() <= 32) {
//                        delay = 6;
//                    } else
//                    if (lhs.getOutputBitsize() <= 32 &&
//                            rhs.getOutputBitsize() <= 32 &&
//                            getOutputBitsize() <= 64) {
//                        delay = 11;
//                    } else
//                    if (lhs.getOutputBitsize() <= 64 &&
//                            rhs.getOutputBitsize() <= 64 &&
//                            getOutputBitsize() <= 128) {
//                        delay = 18;
//                    }
                    assert delay > 0;
                    assert delay < 20 : String.format(
                            "delay %d < 20 violated | %d * %d ", delay,
                            lhs.getOutputBitsize(), rhs.getOutputBitsize());
                    return delay;
                }
            } else {
                if (lhs.getOutputBitsize() == 21 && rhs.getOutputBitsize() == 21 &&
                        getOutputBitsize() == 42) {
                    return 4;
                }
                if (lhs.getOutputBitsize() <= 16 && rhs.getOutputBitsize() <= 16 &&
                        getOutputBitsize() <= 32) {
                    return 2;
                }
                if (lhs.getOutputBitsize() <= 32 && rhs.getOutputBitsize() <= 32 &&
                        getOutputBitsize() <= 64) {
                    return 4;
                }
                if (lhs.getOutputBitsize() <= 64 && rhs.getOutputBitsize() <= 64 &&
                        getOutputBitsize() <= 128) {
                    return 6;
                }
            }
        }
        return delay;
    }

    @Override
    public int getStageDelay() {
//        if(getOutputBitsize() > 32)
//            return 2;
//        else
        return super.getStageDelay();
    }
}