25x speedup by moving to switch table

src/main/kotlin/Main.kt

@@ -19,12 +19,12 @@ fun main(args: Array<String>) {
         cpu.runState = CPU.RunState.RUNNING
         cpu.pc = 0x80u
         val start = System.nanoTime()
-        val ninsn = cpu.run(50000000)
+        val ninsn = cpu.run(600000000)
         val end = System.nanoTime()
 
         System.err.println("Halted at 0${cpu.pc.toString(8)}")
         val time = (end - start).toDouble() / 1_000_000_000.0
-        println("Executed ${ninsn} in ${time}s: ${ninsn / time} i/s")
+        println("Executed ${ninsn} in ${time}s: ${ninsn / time / 1_000_000} MIPS")
     } finally {
         println("Exiting")
         console.stop()