module Adders where
import Bits
+import qualified Sim
import Language.Haskell.Syntax
-main = do show_add exp_adder; show_add rec_adder;
+mainIO f = Sim.simulateIO (Sim.stateless f) ()
+
+-- This function is from Sim.hs, but we redefine it here so it can get inlined
+-- by default.
+stateless :: (i -> o) -> (i -> () -> ((), o))
+stateless f = \i s -> (s, f i)
show_add f = do print ("Sum: " ++ (displaysigs s)); print ("Carry: " ++ (displaysig c))
where
dup :: Bit -> (Bit, Bit)
dup a = (a, a)
+-- Not really an adder either, but a simple stateful example (D-flipflop)
+dff :: Bit -> Bit -> (Bit, Bit)
+dff d s = (s', q)
+ where
+ q = s
+ s' = d
+
-- Combinatoric stateless no-carry adder
-- A -> B -> S
no_carry_adder :: (Bit, Bit) -> Bit
(s, c2) = half_adder(s1, cin)
c = c1 `hwor` c2
+sfull_adder = stateless full_adder
+
-- Four bit adder
-- Explicit version
-- [a] -> [b] -> ([s], cout)