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{-# LANGUAGE GADTs #-}
{-# LANGUAGE LambdaCase #-}
module SC.Acc where
import qualified Data.Array.Accelerate.AST as A
import Data.Array.Accelerate.AST.LeftHandSide
import Data.Array.Accelerate.AST.Var
import Data.Array.Accelerate.Representation.Array
import Data.Array.Accelerate.Representation.Type
import Data.Array.Accelerate.Type
import Data.Bifunctor
import qualified Data.Set as Set
import qualified Language.C as C
import SC.Defs
import SC.Monad
data Command
= CChunk [C.FunDef] -- ^ Emitted top-level function definitions
[C.Stmt] -- ^ Code to execute
[C.Name] -- ^ Array variables used
| CAlloc [C.FunDef] -- ^ Emitted top-level function definitions
C.Type -- ^ Element type of the allocated array
C.Name -- ^ Variable to store it in
C.StExpr -- ^ Code that computes the array size
| CKeepalive C.Name -- ^ Never deallocate this
| CDealloc C.Name
deriving (Show)
insertDeallocs :: [Command] -> [Command]
insertDeallocs cmds =
let allocated = Set.fromList [n | CAlloc _ _ n _ <- cmds]
`Set.union` Set.fromList [n | CKeepalive n <- cmds]
in fst $ foldr
(\cmd (rest, done) -> case cmd of
CChunk _ _ used ->
let todealloc = filter (\n -> n `Set.member` allocated &&
n `Set.notMember` done)
used
in (cmd : map CDealloc todealloc ++ rest
,done `Set.union` Set.fromList todealloc)
CAlloc _ _ name _
| name `Set.notMember` done -> (rest, done) -- unused alloc
| otherwise -> (cmd : rest, Set.delete name done)
CKeepalive _ -> (rest, done) -- already handled above in @allocated@
CDealloc _ -> error "insertDeallocs: CDealloc found")
([], mempty) cmds
compileCommands :: [Command] -> ([C.FunDef], [C.Stmt])
compileCommands [] = ([], [])
compileCommands (CChunk defs code _ : cmds) =
bimap (defs ++) (code ++) (compileCommands cmds)
compileCommands (CAlloc defs typ name (C.StExpr szstmts szexpr) : cmds) =
let allocstmt = C.SDecl (C.TPtr typ) name
(Just (C.ECall (C.Name "malloc") [C.EOp szexpr "*" (C.ESizeOf typ)]))
in bimap (defs ++) ((szstmts ++ [allocstmt]) ++) (compileCommands cmds)
compileCommands (CDealloc name : cmds) =
second ([C.SCall (C.Name "free") [C.EVar name]] ++) (compileCommands cmds)
compileCommands (CKeepalive _ : cmds) = compileCommands cmds
compileAcc' :: AVarEnv aenv -> TupANames t -> A.OpenAcc aenv t -> SC [Command]
compileAcc' aenv dest (A.OpenAcc acc) = compilePAcc' aenv dest acc
compilePAcc' :: AVarEnv aenv -> TupANames t -> A.PreOpenAcc A.OpenAcc aenv t -> SC [Command]
compilePAcc' aenv destnames = \case
A.Alet lhs rhs body -> do
(names, aenv') <- genVarsAEnv lhs aenv
let sts1 = [C.SDecl t n Nothing | TypedAName t n <- itupList names]
let cmds1 = [CChunk [] sts1 []]
cmds2 <- compileAcc' aenv names rhs
cmds3 <- compileAcc' aenv' destnames body
return (cmds1 ++ cmds2 ++ cmds3)
A.Avar (Var _ idx) ->
return (Right ([], ITupSingle (C.EVar (aveprj aenv idx))))
A.Apair a b -> do
res1 <- compileAcc' aenv a
res2 <- compileAcc' aenv b
return (Left (\case
ITupPair n1 n2 -> toStoring res1 n1 ++ toStoring res2 n2
ITupIgnore -> []
ITupSingle _ -> error "wat"))
_ -> throw "Unsupported Acc constructor"
where
toStExprs :: TypeR t -> Either (ANames t -> [C.Stmt]) ([C.Stmt], Exprs t) -> SC ([C.Stmt], Exprs t)
toStExprs ty (Left fun) = do
names <- genAVars ty
let sts1 = fun names
return (sts1, itupmap (\(TypedName _ n) -> C.EVar n) names)
toStExprs _ (Right pair) = return pair
toStoring :: Either (Names t -> [C.Stmt]) ([C.Stmt], Exprs t) -> Names t -> [C.Stmt]
toStoring (Left f) = f
toStoring (Right (sts, exs)) = (sts ++) . flip go exs
where
go :: Names t -> Exprs t -> [C.Stmt]
go (ITupSingle (TypedName _ name)) (ITupSingle ex) = [C.SAsg name ex]
go (ITupSingle _) _ = error "wat"
go ITupIgnore _ = []
go (ITupPair ns1 ns2) (ITupPair es1 es2) = go ns1 es1 ++ go ns2 es2
go (ITupPair _ _) _ = error "wat"
genVarsAEnv :: A.ALeftHandSide t aenv aenv' -> AVarEnv aenv -> SC (TupANames t, AVarEnv aenv')
genVarsAEnv (LeftHandSideWildcard _) env = return (ANIgnore, env)
genVarsAEnv (LeftHandSideSingle (ArrayR _ ty)) env = do
name <- genName "a"
ty' <- cvtType ty
return (ITupSingle (TypedAName ty' name), AVEPush _ name env)
genVarsAEnv (LeftHandSidePair lhs1 lhs2) env = do
(n1, env1) <- genVarsAEnv lhs1 env
(n2, env2) <- genVarsAEnv lhs2 env1
return (ITupPair n1 n2, env2)
genAVars :: TypeR t -> SC (ANames t)
genAVars TupRunit = return ITupIgnore
genAVars (TupRsingle ty) = genAVar ty
genAVars (TupRpair t1 t2) = ITupPair <$> genAVars t1 <*> genAVars t2
genAVar :: ScalarType t -> SC (ANames t)
genAVar ty = ITupSingle <$> (TypedAName <$> cvtType ty <*> genName "a")
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