{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE FlexibleContexts #-}
module Data.Array.Accelerate.Utility.Lift.Acc (
Unlift,
Unlifted,
Tuple,
unlift,
modify,
modify2,
modify3,
modify4,
Acc(Acc), acc,
Exp(Exp), expr,
unliftPair,
unliftTriple,
unliftQuadruple,
mapFst,
mapSnd,
singleton,
the,
) where
import qualified Data.Array.Accelerate as A
import qualified Data.Tuple.HT as Tuple
import Data.Tuple.HT (mapTriple)
class (A.Arrays (Tuple pattern)) => Unlift pattern where
type Unlifted pattern
type Tuple pattern
unlift :: pattern -> A.Acc (Tuple pattern) -> Unlifted pattern
modify ::
(A.Lift A.Acc a, Unlift pattern) =>
pattern ->
(Unlifted pattern -> a) ->
A.Acc (Tuple pattern) -> A.Acc (A.Plain a)
modify p f = A.lift . f . unlift p
modify2 ::
(A.Lift A.Acc a, Unlift patternA, Unlift patternB) =>
patternA ->
patternB ->
(Unlifted patternA -> Unlifted patternB -> a) ->
A.Acc (Tuple patternA) -> A.Acc (Tuple patternB) -> A.Acc (A.Plain a)
modify2 pa pb f a b = A.lift $ f (unlift pa a) (unlift pb b)
modify3 ::
(A.Lift A.Acc a, Unlift patternA, Unlift patternB, Unlift patternC) =>
patternA ->
patternB ->
patternC ->
(Unlifted patternA -> Unlifted patternB -> Unlifted patternC -> a) ->
A.Acc (Tuple patternA) -> A.Acc (Tuple patternB) ->
A.Acc (Tuple patternC) -> A.Acc (A.Plain a)
modify3 pa pb pc f a b c =
A.lift $ f (unlift pa a) (unlift pb b) (unlift pc c)
modify4 ::
(A.Lift A.Acc a,
Unlift patternA, Unlift patternB, Unlift patternC, Unlift patternD) =>
patternA ->
patternB ->
patternC ->
patternD ->
(Unlifted patternA -> Unlifted patternB ->
Unlifted patternC -> Unlifted patternD -> a) ->
A.Acc (Tuple patternA) -> A.Acc (Tuple patternB) ->
A.Acc (Tuple patternC) -> A.Acc (Tuple patternD) -> A.Acc (A.Plain a)
modify4 pa pb pc pd f a b c d =
A.lift $ f (unlift pa a) (unlift pb b) (unlift pc c) (unlift pd d)
instance (A.Arrays a) => Unlift (Acc a) where
type Unlifted (Acc a) = A.Acc a
type Tuple (Acc a) = a
unlift _ = id
data Acc a = Acc
acc :: Acc a
acc = Acc
instance (A.Elt a) => Unlift (Exp a) where
type Unlifted (Exp a) = A.Exp a
type Tuple (Exp a) = A.Scalar a
unlift _ = A.the
data Exp e = Exp
expr :: Exp e
expr = Exp
-- | like 'A.unit' in the 'Acc' environment
singleton :: (A.Elt e) => e -> A.Scalar e
singleton x = A.fromList A.Z [x]
-- | like 'A.the' in the 'Acc' environment
the :: (A.Elt e) => A.Scalar e -> e
the arr = A.indexArray arr A.Z
instance (Unlift pa, Unlift pb) => Unlift (pa,pb) where
type Unlifted (pa,pb) = (Unlifted pa, Unlifted pb)
type Tuple (pa,pb) = (Tuple pa, Tuple pb)
unlift (pa,pb) ab =
(unlift pa $ A.afst ab, unlift pb $ A.asnd ab)
instance
(Unlift pa, Unlift pb, Unlift pc) =>
Unlift (pa,pb,pc) where
type Unlifted (pa,pb,pc) = (Unlifted pa, Unlifted pb, Unlifted pc)
type Tuple (pa,pb,pc) = (Tuple pa, Tuple pb, Tuple pc)
unlift (pa,pb,pc) =
mapTriple (unlift pa, unlift pb, unlift pc) . A.unlift
unliftPair :: (A.Arrays a, A.Arrays b) => A.Acc (a,b) -> (A.Acc a, A.Acc b)
unliftPair = A.unlift
unliftTriple ::
(A.Arrays a, A.Arrays b, A.Arrays c) => A.Acc (a,b,c) -> (A.Acc a, A.Acc b, A.Acc c)
unliftTriple = A.unlift
unliftQuadruple ::
(A.Arrays a, A.Arrays b, A.Arrays c, A.Arrays d) =>
A.Acc (a,b,c,d) -> (A.Acc a, A.Acc b, A.Acc c, A.Acc d)
unliftQuadruple = A.unlift
mapFst ::
(A.Arrays a, A.Arrays b, A.Arrays c) =>
(A.Acc a -> A.Acc b) -> A.Acc (a,c) -> A.Acc (b,c)
mapFst f = modify (acc,acc) $ Tuple.mapFst f
mapSnd ::
(A.Arrays a, A.Arrays b, A.Arrays c) =>
(A.Acc b -> A.Acc c) -> A.Acc (a,b) -> A.Acc (a,c)
mapSnd f = modify (acc,acc) $ Tuple.mapSnd f