10. Maygate Cell

Randomly sets the state of a wire to be 1 or 0.

byte 1: wire to set. 0 by default.

For now, this is just a cointoss (50/50) probability.

If the data is non-zero, maygate can function as a conditional jump. The random state of 1 will cause a jump to the location stored in the data byte.

static int maygate(trig_vm *vm,
                   int pos,
                   uint32_t cmd,
                   uint32_t data)
{
    int byte;
    int wire;
    double rnd;

    byte = (cmd >> 8) & 0xFF;

    /* right most bit */
    byte &= -byte;

    wire = 0;
    while (byte >>= 1) wire++;

    rnd = (double) rand() / RAND_MAX;

    if (rnd > 0.5) {
        trig_vm_wire_set(vm, wire, 1);
    } else {
        trig_vm_wire_set(vm, wire, 0);
    }

    if (data == 0) {
        return (pos + 1) % 32;
    } else {
        if (rnd > 0.5) {
            int go;

            byte = data;
            byte &= -byte;
            go = 0;
            while (byte >>= 1) go++;

            return go;
        } else {
            return (pos + 1) % 32;
        }
    }
}

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