pecial because it only has one argument. */
	if ((regs[RB_FLAGS] &amp; 0x2U) == 0) {
	    rabbitw src = i.modes.immediate  ? fetch_immediate() : regs[i.regc];
	    regs[RB_IP] = i.modes.regc_deref ? mem[src] : src;
	}
	break;
    case RB_BRNZ:
	/* Branch not zero is special because it only has one argument. */
	if ((regs[RB_FLAGS] &amp; 0x2U) != 0) {
	    rabbitw src = i.modes.immediate ? fetch_immediate() : regs[i.regc];
	    regs[RB_IP] = i.modes.regc_deref ? mem[src] : src;
	}
	break;
    case RB_IN: {
	