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

    where

    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
    	| RcDoubleSSE -- x86 only: the SSE regs are a separate class
    	deriving Eq

    instance Uniquable RegClass where
        getUnique RcInteger	= mkRegClassUnique 0
        getUnique RcFloat	= mkRegClassUnique 1
        getUnique RcDouble	= mkRegClassUnique 2
        getUnique RcDoubleSSE = mkRegClassUnique 3

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