RegClass.hs

-- | An architecture independent description of a register's class.
module RegClass
        ( RegClass(..)
        , allRegClasses
        ) where

import GhcPrelude

import  Outputable
import  Unique

-- | The class of a register.
--      Used in the register allocator.
--      We treat all registers in a class as being interchangable.
--
data RegClass
        = RcInteger
        | RcFloat
        | RcDouble
        deriving (Eq, Show)

allRegClasses :: [RegClass]
allRegClasses =
    [ RcInteger, RcFloat, RcDouble ]


instance Uniquable RegClass where
    getUnique RcInteger = mkRegClassUnique 0
    getUnique RcFloat   = mkRegClassUnique 1
    getUnique RcDouble  = mkRegClassUnique 2

instance Outputable RegClass where
    ppr RcInteger         = Outputable.text "I"
    ppr RcFloat           = Outputable.text "F"
    ppr RcDouble          = Outputable.text "D"