From dcf9dd6d86a5f256c1129146a977620ab6d8d466 Mon Sep 17 00:00:00 2001 From: Matthijs Kooijman Date: Fri, 30 Jan 2009 10:11:06 +0100 Subject: [PATCH] Store the RegisterBankState in a algbraic data type. --- Alu.hs | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/Alu.hs b/Alu.hs index 59e5fd5..40f7622 100644 --- a/Alu.hs +++ b/Alu.hs @@ -14,30 +14,32 @@ program = [ (High, High, DontCare) -- r1 = z (0) ] -initial_state = ((Low, High), (), Low, Low) +initial_state = (Regs Low High, (), Low, Low) -- Register bank type RegAddr = Bit -type RegisterBankState = (Bit, Bit) +--type RegisterBankState = (Bit, Bit) +data RegisterBankState = Regs { r0, r1 :: Bit} deriving (Show) + register_bank :: (RegAddr, Bit, Bit) -> -- (addr, we, d) RegisterBankState -> -- s (RegisterBankState, Bit) -- (s', o) register_bank (Low, Low, _) s = -- Read r0 - (s, fst s) + (s, r0 s) register_bank (High, Low, _) s = -- Read r1 - (s, snd s) + (s, r1 s) register_bank (addr, High, d) s = -- Write (s', DontCare) where - (r0, r1) = s + Regs r0 r1 = s r0' = if addr == Low then d else r0 r1' = if addr == High then d else r1 - s' = (r0', r1') + s' = Regs r0' r1' -- ALU -- 2.30.2