-alu :: (AluOp, Bit, Bit) -> Bit
-alu (High, a, b) = a `hwand` b
-alu (Low, a, b) = a `hwor` b
+alu :: AluOp -> Word -> Word -> Word
+{-# NOINLINE alu #-}
+--alu High a b = a `hwand` b
+--alu Low a b = a `hwor` b
+alu High a b = a + b
+alu Low a b = a - b