ship: Lut

== Ports ===========================================================
data  in:   in1
data  in:   in2
data  in:   in3
data  in:   inLut

data  out:  out

== Constants ========================================================

== TeX ==============================================================

This ship implements a {\bf L}ook {\bf U}p {\bf T}able.  The least
significant eight bits of the {\tt inLut} value form a truth table
with two inputs and one output (FIXME: specify the layout).

When values are available at all three inputs they are consumed and a
value is produced at {\tt out}.  Each bit of {\tt out} is produced by
looking up the corresponding bits of {\tt in1} and {\tt in2} in the
{\tt inLut} truth table.

== Fleeterpreter ====================================================
    public void service() {
        if (box_in1.dataReadyForShip() &&
            box_in2.dataReadyForShip() &&
            box_inLut.dataReadyForShip()) {
            int a      = box_in1.removeDataForShip();
            int b      = box_in2.removeDataForShip();
            int lut    = box_inLut.removeDataForShip();
            int ret = 0;
            if ((lut & 1) != 0) ret |= (~a) & (~b);
            if ((lut & 2) != 0) ret |= (a)  & (~b);
            if ((lut & 4) != 0) ret |= (~a) &  (b);
            if ((lut & 8) != 0) ret |=   a  &    b;
            box_out.addDataFromShip(ret);
        }
    }

== FleetSim ==============================================================
== FPGA ==============================================================
// not implemented FIXME

== Contributors =========================================================
Adam Megacz <megacz@cs.berkeley.edu>