module PPC.Cond (
        Cond(..),
        condNegate,
        condUnsigned,
        condToSigned,
        condToUnsigned,
)

where

import Panic

data Cond
        = ALWAYS
        | EQQ
        | GE
        | GEU
        | GTT
        | GU
        | LE
        | LEU
        | LTT
        | LU
        | NE
        deriving Eq


condNegate :: Cond -> Cond
condNegate ALWAYS  = panic "condNegate: ALWAYS"
condNegate EQQ     = NE
condNegate GE      = LTT
condNegate GEU     = LU
condNegate GTT     = LE
condNegate GU      = LEU
condNegate LE      = GTT
condNegate LEU     = GU
condNegate LTT     = GE
condNegate LU      = GEU
condNegate NE      = EQQ

-- Condition utils
condUnsigned :: Cond -> Bool
condUnsigned GU  = True
condUnsigned LU  = True
condUnsigned GEU = True
condUnsigned LEU = True
condUnsigned _   = False

condToSigned :: Cond -> Cond
condToSigned GU  = GTT
condToSigned LU  = LTT
condToSigned GEU = GE
condToSigned LEU = LE
condToSigned x   = x

condToUnsigned :: Cond -> Cond
condToUnsigned GTT = GU
condToUnsigned LTT = LU
condToUnsigned GE  = GEU
condToUnsigned LE  = LEU
condToUnsigned x   = x