Really revert all of the recent rotating changes.

[matthijs/master-project/cλash.git] / Alu.hs

diff --git a/Alu.hs b/Alu.hs
index 2495df25f0c80b885f4095012088e4f2b30f2623..7171a6549d4a216f7ffb876eacdc4d8db5e22571 100644 (file)
--- a/Alu.hs
+++ b/Alu.hs
@@ -1,70 +1,81 @@
-module Alu (main) where
-import Bits
+module Alu where
 import qualified Sim
+import CLasH.HardwareTypes hiding (fst,snd)
+import CLasH.Translator.Annotations
+import qualified Prelude as P
+
+fst (a, b) = a
+snd (a, b) = b
 
 main = Sim.simulate exec program initial_state
 mainIO = Sim.simulateIO exec initial_state
 
+dontcare = Low
+
 program = [
             -- (addr, we, op)
             (High, Low, High), -- z = r1 and t (0) ; t = r1 (1)
             (Low, Low, Low), -- z = r0 or t (1); t = r0 (0)
-            (Low, High, DontCare), -- r0 = z (1)
+            (Low, High, dontcare), -- r0 = z (1)
             (High, Low, High), -- z = r1 and t (0); t = r1 (1)
-            (High, High, DontCare) -- r1 = z (0)
+            (High, High, dontcare) -- r1 = z (0)
           ]
 
-initial_state = ((Low, High), (), Low, Low)
-
---
---
+--initial_state = (Regs Low High, Low, Low)
+initial_state = State (State (0, 1), 0, 0)
 
+type Word = SizedWord D4
+-- Register bank
 type RegAddr = Bit
-type RegisterBankState = (Bit, Bit)
-register_bank :: 
-  (RegAddr, Bit, Bit) -> -- (addr, we, d)
-  RegisterBankState -> -- s
-  (RegisterBankState, Bit) -- (s', o)
-
-register_bank (Low, Low, _) s = -- Read r0
-  (s, fst s)
+type RegisterBankState = State (Word, Word)
+--data RegisterBankState = Regs { r0, r1 :: Bit} deriving (Show)
 
-register_bank (High, Low, _) s = -- Read r1
-  (s, snd s)
+{-# NOINLINE register_bank #-}
+register_bank :: 
+  RegAddr -- ^ Address
+  -> Bit -- ^ Write Enable
+  -> Word -- ^ Data
+  -> RegisterBankState -> -- State
+  (RegisterBankState, Word) -- (State', Output)
 
-register_bank (addr, High, d) s = -- Write
-  (s', DontCare)
+register_bank addr we d (State s) = (State s', o)
   where
-    (r0, r1) = s
-    r0' = if addr == Low then d else r0
-    r1' = if addr == High then d else r1
-    s' = (r0', r1')
+    s' = case we of
+      Low -> s -- Read
+      High -> -- Write
+        let
+          (r0, r1) = s
+          r0' = case addr of Low -> d; High -> r0
+          r1' = case addr of High -> d; Low -> r1
+        in (r0', r1')
+    o = case we of
+      -- Read
+      Low -> case addr of Low -> fst s; High -> snd s
+      -- Write
+      High -> 0 -- Don't output anything useful
+
+-- ALU
 
-type AluState = ()
 type AluOp = Bit
 
-alu :: (AluOp, Bit, Bit) -> AluState -> (AluState, Bit)
-alu (High, a, b) s = ((), a `hwand` b)
-alu (Low, a, b) s = ((), 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
 
-type ExecState = (RegisterBankState, AluState, Bit, Bit)
-exec :: (RegAddr, Bit, AluOp) -> ExecState -> (ExecState, ())
+type ExecState = State (RegisterBankState, Word, Word)
+exec :: (RegAddr, Bit, AluOp) -> ExecState -> (ExecState, Word)
 
+{-# ANN exec TopEntity #-}
 -- Read & Exec
-exec (addr, Low, op) s =
-  (s', ())
-  where
-    (reg_s, alu_s, t, z) = s
-    (reg_s', t') = register_bank (addr, Low, DontCare) reg_s
-    (alu_s', z') = alu (op, t', t) alu_s
-    s' = (reg_s', alu_s', t', z')
-
--- Write
-exec (addr, High, op) s =
-  (s', ())
+exec (addr, we, op) (State s) =
+  (State s', z')
   where
-    (reg_s, alu_s, t, z) = s
-    (reg_s', _) = register_bank (addr, High, z) reg_s
-    s' = (reg_s', alu_s, t, z)
+    (reg_s, t, z) = s
+    (reg_s', t') = register_bank addr we z reg_s
+    z' = alu op t' t
+    s' = (reg_s', t', z')
 
 -- vim: set ts=8 sw=2 sts=2 expandtab: