{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE RankNTypes #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TypeFamilies #-}

-- | Kernel extraction.
--
-- In the following, I will use the term "width" to denote the amount
-- of immediate parallelism in a map - that is, the outer size of the
-- array(s) being used as input.
--
-- = Basic Idea
--
-- If we have:
--
-- @
--   map
--     map(f)
--     stms_a...
--     map(g)
-- @
--
-- Then we want to distribute to:
--
-- @
--   map
--     map(f)
--   map
--     stms_a
--   map
--     map(g)
-- @
--
-- But for now only if
--
--  (0) it can be done without creating irregular arrays.
--      Specifically, the size of the arrays created by @map(f)@, by
--      @map(g)@ and whatever is created by @stms_a@ that is also used
--      in @map(g)@, must be invariant to the outermost loop.
--
--  (1) the maps are _balanced_.  That is, the functions @f@ and @g@
--      must do the same amount of work for every iteration.
--
-- The advantage is that the map-nests containing @map(f)@ and
-- @map(g)@ can now be trivially flattened at no cost, thus exposing
-- more parallelism.  Note that the @stms_a@ map constitutes array
-- expansion, which requires additional storage.
--
-- = Distributing Sequential Loops
--
-- As a starting point, sequential loops are treated like scalar
-- expressions.  That is, not distributed.  However, sometimes it can
-- be worthwhile to distribute if they contain a map:
--
-- @
--   map
--     loop
--       map
--     map
-- @
--
-- If we distribute the loop and interchange the outer map into the
-- loop, we get this:
--
-- @
--   loop
--     map
--       map
--   map
--     map
-- @
--
-- Now more parallelism may be available.
--
-- = Unbalanced Maps
--
-- Unbalanced maps will as a rule be sequentialised, but sometimes,
-- there is another way.  Assume we find this:
--
-- @
--   map
--     map(f)
--       map(g)
--     map
-- @
--
-- Presume that @map(f)@ is unbalanced.  By the simple rule above, we
-- would then fully sequentialise it, resulting in this:
--
-- @
--   map
--     loop
--   map
--     map
-- @
--
-- == Balancing by Loop Interchange
--
-- The above is not ideal, as we cannot flatten the @map-loop@ nest,
-- and we are thus limited in the amount of parallelism available.
--
-- But assume now that the width of @map(g)@ is invariant to the outer
-- loop.  Then if possible, we can interchange @map(f)@ and @map(g)@,
-- sequentialise @map(f)@ and distribute, interchanging the outer
-- parallel loop into the sequential loop:
--
-- @
--   loop(f)
--     map
--       map(g)
--   map
--     map
-- @
--
-- After flattening the two nests we can obtain more parallelism.
--
-- When distributing a map, we also need to distribute everything that
-- the map depends on - possibly as its own map.  When distributing a
-- set of scalar bindings, we will need to know which of the binding
-- results are used afterwards.  Hence, we will need to compute usage
-- information.
--
-- = Redomap
--
-- Redomap can be handled much like map.  Distributed loops are
-- distributed as maps, with the parameters corresponding to the
-- neutral elements added to their bodies.  The remaining loop will
-- remain a redomap.  Example:
--
-- @
-- redomap(op,
--         fn (v) =>
--           map(f)
--           map(g),
--         e,a)
-- @
--
-- distributes to
--
-- @
-- let b = map(fn v =>
--               let acc = e
--               map(f),
--               a)
-- redomap(op,
--         fn (v,dist) =>
--           map(g),
--         e,a,b)
-- @
--
-- Note that there may be further kernel extraction opportunities
-- inside the @map(f)@.  The downside of this approach is that the
-- intermediate array (@b@ above) must be written to main memory.  An
-- often better approach is to just turn the entire @redomap@ into a
-- single kernel.
module Futhark.Pass.ExtractKernels (extractKernels) where

import Control.Monad.Identity
import Control.Monad.RWS.Strict
import Control.Monad.Reader
import Data.Bifunctor (first)
import Data.Maybe
import qualified Futhark.IR.GPU as Out
import Futhark.IR.GPU.Op
import Futhark.IR.SOACS
import Futhark.IR.SOACS.Simplify (simplifyStms)
import Futhark.MonadFreshNames
import Futhark.Pass
import Futhark.Pass.ExtractKernels.BlockedKernel
import Futhark.Pass.ExtractKernels.DistributeNests
import Futhark.Pass.ExtractKernels.Distribution
import Futhark.Pass.ExtractKernels.ISRWIM
import Futhark.Pass.ExtractKernels.Intragroup
import Futhark.Pass.ExtractKernels.StreamKernel
import Futhark.Pass.ExtractKernels.ToGPU
import Futhark.Tools
import qualified Futhark.Transform.FirstOrderTransform as FOT
import Futhark.Transform.Rename
import Futhark.Util.Log
import Prelude hiding (log)

-- | Transform a program using SOACs to a program using explicit
-- kernels, using the kernel extraction transformation.
extractKernels :: Pass SOACS Out.GPU
extractKernels :: Pass SOACS GPU
extractKernels =
  Pass :: forall fromrep torep.
String
-> String
-> (Prog fromrep -> PassM (Prog torep))
-> Pass fromrep torep
Pass
    { passName :: String
passName = String
"extract kernels",
      passDescription :: String
passDescription = String
"Perform kernel extraction",
      passFunction :: Prog SOACS -> PassM (Prog GPU)
passFunction = Prog SOACS -> PassM (Prog GPU)
transformProg
    }

transformProg :: Prog SOACS -> PassM (Prog Out.GPU)
transformProg :: Prog SOACS -> PassM (Prog GPU)
transformProg (Prog Stms SOACS
consts [FunDef SOACS]
funs) = do
  GPUStms
consts' <- DistribM GPUStms -> PassM GPUStms
forall (m :: * -> *) a.
(MonadLogger m, MonadFreshNames m) =>
DistribM a -> m a
runDistribM (DistribM GPUStms -> PassM GPUStms)
-> DistribM GPUStms -> PassM GPUStms
forall a b. (a -> b) -> a -> b
$ KernelPath -> [Stm] -> DistribM GPUStms
transformStms KernelPath
forall a. Monoid a => a
mempty ([Stm] -> DistribM GPUStms) -> [Stm] -> DistribM GPUStms
forall a b. (a -> b) -> a -> b
$ Stms SOACS -> [Stm]
forall rep. Stms rep -> [Stm rep]
stmsToList Stms SOACS
consts
  [FunDef GPU]
funs' <- (FunDef SOACS -> PassM (FunDef GPU))
-> [FunDef SOACS] -> PassM [FunDef GPU]
forall (t :: * -> *) (m :: * -> *) a b.
(Traversable t, Monad m) =>
(a -> m b) -> t a -> m (t b)
mapM (Scope GPU -> FunDef SOACS -> PassM (FunDef GPU)
forall (m :: * -> *).
(MonadFreshNames m, MonadLogger m) =>
Scope GPU -> FunDef SOACS -> m (FunDef GPU)
transformFunDef (Scope GPU -> FunDef SOACS -> PassM (FunDef GPU))
-> Scope GPU -> FunDef SOACS -> PassM (FunDef GPU)
forall a b. (a -> b) -> a -> b
$ GPUStms -> Scope GPU
forall rep a. Scoped rep a => a -> Scope rep
scopeOf GPUStms
consts') [FunDef SOACS]
funs
  Prog GPU -> PassM (Prog GPU)
forall (m :: * -> *) a. Monad m => a -> m a
return (Prog GPU -> PassM (Prog GPU)) -> Prog GPU -> PassM (Prog GPU)
forall a b. (a -> b) -> a -> b
$ GPUStms -> [FunDef GPU] -> Prog GPU
forall rep. Stms rep -> [FunDef rep] -> Prog rep
Prog GPUStms
consts' [FunDef GPU]
funs'

-- In order to generate more stable threshold names, we keep track of
-- the numbers used for thresholds separately from the ordinary name
-- source,
data State = State
  { State -> VNameSource
stateNameSource :: VNameSource,
    State -> Int
stateThresholdCounter :: Int
  }

newtype DistribM a = DistribM (RWS (Scope Out.GPU) Log State a)
  deriving
    ( a -> DistribM b -> DistribM a
(a -> b) -> DistribM a -> DistribM b
(forall a b. (a -> b) -> DistribM a -> DistribM b)
-> (forall a b. a -> DistribM b -> DistribM a) -> Functor DistribM
forall a b. a -> DistribM b -> DistribM a
forall a b. (a -> b) -> DistribM a -> DistribM b
forall (f :: * -> *).
(forall a b. (a -> b) -> f a -> f b)
-> (forall a b. a -> f b -> f a) -> Functor f
<$ :: a -> DistribM b -> DistribM a
$c<$ :: forall a b. a -> DistribM b -> DistribM a
fmap :: (a -> b) -> DistribM a -> DistribM b
$cfmap :: forall a b. (a -> b) -> DistribM a -> DistribM b
Functor,
      Functor DistribM
a -> DistribM a
Functor DistribM
-> (forall a. a -> DistribM a)
-> (forall a b. DistribM (a -> b) -> DistribM a -> DistribM b)
-> (forall a b c.
    (a -> b -> c) -> DistribM a -> DistribM b -> DistribM c)
-> (forall a b. DistribM a -> DistribM b -> DistribM b)
-> (forall a b. DistribM a -> DistribM b -> DistribM a)
-> Applicative DistribM
DistribM a -> DistribM b -> DistribM b
DistribM a -> DistribM b -> DistribM a
DistribM (a -> b) -> DistribM a -> DistribM b
(a -> b -> c) -> DistribM a -> DistribM b -> DistribM c
forall a. a -> DistribM a
forall a b. DistribM a -> DistribM b -> DistribM a
forall a b. DistribM a -> DistribM b -> DistribM b
forall a b. DistribM (a -> b) -> DistribM a -> DistribM b
forall a b c.
(a -> b -> c) -> DistribM a -> DistribM b -> DistribM c
forall (f :: * -> *).
Functor f
-> (forall a. a -> f a)
-> (forall a b. f (a -> b) -> f a -> f b)
-> (forall a b c. (a -> b -> c) -> f a -> f b -> f c)
-> (forall a b. f a -> f b -> f b)
-> (forall a b. f a -> f b -> f a)
-> Applicative f
<* :: DistribM a -> DistribM b -> DistribM a
$c<* :: forall a b. DistribM a -> DistribM b -> DistribM a
*> :: DistribM a -> DistribM b -> DistribM b
$c*> :: forall a b. DistribM a -> DistribM b -> DistribM b
liftA2 :: (a -> b -> c) -> DistribM a -> DistribM b -> DistribM c
$cliftA2 :: forall a b c.
(a -> b -> c) -> DistribM a -> DistribM b -> DistribM c
<*> :: DistribM (a -> b) -> DistribM a -> DistribM b
$c<*> :: forall a b. DistribM (a -> b) -> DistribM a -> DistribM b
pure :: a -> DistribM a
$cpure :: forall a. a -> DistribM a
$cp1Applicative :: Functor DistribM
Applicative,
      Applicative DistribM
a -> DistribM a
Applicative DistribM
-> (forall a b. DistribM a -> (a -> DistribM b) -> DistribM b)
-> (forall a b. DistribM a -> DistribM b -> DistribM b)
-> (forall a. a -> DistribM a)
-> Monad DistribM
DistribM a -> (a -> DistribM b) -> DistribM b
DistribM a -> DistribM b -> DistribM b
forall a. a -> DistribM a
forall a b. DistribM a -> DistribM b -> DistribM b
forall a b. DistribM a -> (a -> DistribM b) -> DistribM b
forall (m :: * -> *).
Applicative m
-> (forall a b. m a -> (a -> m b) -> m b)
-> (forall a b. m a -> m b -> m b)
-> (forall a. a -> m a)
-> Monad m
return :: a -> DistribM a
$creturn :: forall a. a -> DistribM a
>> :: DistribM a -> DistribM b -> DistribM b
$c>> :: forall a b. DistribM a -> DistribM b -> DistribM b
>>= :: DistribM a -> (a -> DistribM b) -> DistribM b
$c>>= :: forall a b. DistribM a -> (a -> DistribM b) -> DistribM b
$cp1Monad :: Applicative DistribM
Monad,
      HasScope Out.GPU,
      LocalScope Out.GPU,
      MonadState State,
      Monad DistribM
Applicative DistribM
a -> DistribM ()
Applicative DistribM
-> Monad DistribM
-> (forall a. ToLog a => a -> DistribM ())
-> (Log -> DistribM ())
-> MonadLogger DistribM
Log -> DistribM ()
forall a. ToLog a => a -> DistribM ()
forall (m :: * -> *).
Applicative m
-> Monad m
-> (forall a. ToLog a => a -> m ())
-> (Log -> m ())
-> MonadLogger m
addLog :: Log -> DistribM ()
$caddLog :: Log -> DistribM ()
logMsg :: a -> DistribM ()
$clogMsg :: forall a. ToLog a => a -> DistribM ()
$cp2MonadLogger :: Monad DistribM
$cp1MonadLogger :: Applicative DistribM
MonadLogger
    )

instance MonadFreshNames DistribM where
  getNameSource :: DistribM VNameSource
getNameSource = (State -> VNameSource) -> DistribM VNameSource
forall s (m :: * -> *) a. MonadState s m => (s -> a) -> m a
gets State -> VNameSource
stateNameSource
  putNameSource :: VNameSource -> DistribM ()
putNameSource VNameSource
src = (State -> State) -> DistribM ()
forall s (m :: * -> *). MonadState s m => (s -> s) -> m ()
modify ((State -> State) -> DistribM ())
-> (State -> State) -> DistribM ()
forall a b. (a -> b) -> a -> b
$ \State
s -> State
s {stateNameSource :: VNameSource
stateNameSource = VNameSource
src}

runDistribM ::
  (MonadLogger m, MonadFreshNames m) =>
  DistribM a ->
  m a
runDistribM :: DistribM a -> m a
runDistribM (DistribM RWS (Scope GPU) Log State a
m) = do
  (a
x, Log
msgs) <- (VNameSource -> ((a, Log), VNameSource)) -> m (a, Log)
forall (m :: * -> *) a.
MonadFreshNames m =>
(VNameSource -> (a, VNameSource)) -> m a
modifyNameSource ((VNameSource -> ((a, Log), VNameSource)) -> m (a, Log))
-> (VNameSource -> ((a, Log), VNameSource)) -> m (a, Log)
forall a b. (a -> b) -> a -> b
$ \VNameSource
src ->
    let (a
x, State
s, Log
msgs) = RWS (Scope GPU) Log State a
-> Scope GPU -> State -> (a, State, Log)
forall r w s a. RWS r w s a -> r -> s -> (a, s, w)
runRWS RWS (Scope GPU) Log State a
m Scope GPU
forall a. Monoid a => a
mempty (VNameSource -> Int -> State
State VNameSource
src Int
0)
     in ((a
x, Log
msgs), State -> VNameSource
stateNameSource State
s)
  Log -> m ()
forall (m :: * -> *). MonadLogger m => Log -> m ()
addLog Log
msgs
  a -> m a
forall (m :: * -> *) a. Monad m => a -> m a
return a
x

transformFunDef ::
  (MonadFreshNames m, MonadLogger m) =>
  Scope Out.GPU ->
  FunDef SOACS ->
  m (Out.FunDef Out.GPU)
transformFunDef :: Scope GPU -> FunDef SOACS -> m (FunDef GPU)
transformFunDef Scope GPU
scope (FunDef Maybe EntryPoint
entry Attrs
attrs Name
name [RetType SOACS]
rettype [FParam SOACS]
params BodyT SOACS
body) = DistribM (FunDef GPU) -> m (FunDef GPU)
forall (m :: * -> *) a.
(MonadLogger m, MonadFreshNames m) =>
DistribM a -> m a
runDistribM (DistribM (FunDef GPU) -> m (FunDef GPU))
-> DistribM (FunDef GPU) -> m (FunDef GPU)
forall a b. (a -> b) -> a -> b
$ do
  Body GPU
body' <-
    Scope GPU -> DistribM (Body GPU) -> DistribM (Body GPU)
forall rep (m :: * -> *) a.
LocalScope rep m =>
Scope rep -> m a -> m a
localScope (Scope GPU
scope Scope GPU -> Scope GPU -> Scope GPU
forall a. Semigroup a => a -> a -> a
<> [Param DeclType] -> Scope GPU
forall rep dec. (FParamInfo rep ~ dec) => [Param dec] -> Scope rep
scopeOfFParams [Param DeclType]
[FParam SOACS]
params) (DistribM (Body GPU) -> DistribM (Body GPU))
-> DistribM (Body GPU) -> DistribM (Body GPU)
forall a b. (a -> b) -> a -> b
$
      KernelPath -> BodyT SOACS -> DistribM (Body GPU)
transformBody KernelPath
forall a. Monoid a => a
mempty BodyT SOACS
body
  FunDef GPU -> DistribM (FunDef GPU)
forall (m :: * -> *) a. Monad m => a -> m a
return (FunDef GPU -> DistribM (FunDef GPU))
-> FunDef GPU -> DistribM (FunDef GPU)
forall a b. (a -> b) -> a -> b
$ Maybe EntryPoint
-> Attrs
-> Name
-> [RetType GPU]
-> [FParam GPU]
-> Body GPU
-> FunDef GPU
forall rep.
Maybe EntryPoint
-> Attrs
-> Name
-> [RetType rep]
-> [FParam rep]
-> BodyT rep
-> FunDef rep
FunDef Maybe EntryPoint
entry Attrs
attrs Name
name [RetType SOACS]
[RetType GPU]
rettype [FParam SOACS]
[FParam GPU]
params Body GPU
body'

type GPUStms = Stms Out.GPU

transformBody :: KernelPath -> Body -> DistribM (Out.Body Out.GPU)
transformBody :: KernelPath -> BodyT SOACS -> DistribM (Body GPU)
transformBody KernelPath
path BodyT SOACS
body = do
  GPUStms
stms <- KernelPath -> [Stm] -> DistribM GPUStms
transformStms KernelPath
path ([Stm] -> DistribM GPUStms) -> [Stm] -> DistribM GPUStms
forall a b. (a -> b) -> a -> b
$ Stms SOACS -> [Stm]
forall rep. Stms rep -> [Stm rep]
stmsToList (Stms SOACS -> [Stm]) -> Stms SOACS -> [Stm]
forall a b. (a -> b) -> a -> b
$ BodyT SOACS -> Stms SOACS
forall rep. BodyT rep -> Stms rep
bodyStms BodyT SOACS
body
  Body GPU -> DistribM (Body GPU)
forall (m :: * -> *) a. Monad m => a -> m a
return (Body GPU -> DistribM (Body GPU))
-> Body GPU -> DistribM (Body GPU)
forall a b. (a -> b) -> a -> b
$ GPUStms -> Result -> Body GPU
forall rep. Buildable rep => Stms rep -> Result -> Body rep
mkBody GPUStms
stms (Result -> Body GPU) -> Result -> Body GPU
forall a b. (a -> b) -> a -> b
$ BodyT SOACS -> Result
forall rep. BodyT rep -> Result
bodyResult BodyT SOACS
body

transformStms :: KernelPath -> [Stm] -> DistribM GPUStms
transformStms :: KernelPath -> [Stm] -> DistribM GPUStms
transformStms KernelPath
_ [] =
  GPUStms -> DistribM GPUStms
forall (m :: * -> *) a. Monad m => a -> m a
return GPUStms
forall a. Monoid a => a
mempty
transformStms KernelPath
path (Stm
stm : [Stm]
stms) =
  Stm -> DistribM (Maybe (Stms SOACS))
sequentialisedUnbalancedStm Stm
stm DistribM (Maybe (Stms SOACS))
-> (Maybe (Stms SOACS) -> DistribM GPUStms) -> DistribM GPUStms
forall (m :: * -> *) a b. Monad m => m a -> (a -> m b) -> m b
>>= \case
    Maybe (Stms SOACS)
Nothing -> do
      GPUStms
stm' <- KernelPath -> Stm -> DistribM GPUStms
transformStm KernelPath
path Stm
stm
      GPUStms -> DistribM GPUStms -> DistribM GPUStms
forall rep a (m :: * -> *) b.
(Scoped rep a, LocalScope rep m) =>
a -> m b -> m b
inScopeOf GPUStms
stm' (DistribM GPUStms -> DistribM GPUStms)
-> DistribM GPUStms -> DistribM GPUStms
forall a b. (a -> b) -> a -> b
$
        (GPUStms
stm' GPUStms -> GPUStms -> GPUStms
forall a. Semigroup a => a -> a -> a
<>) (GPUStms -> GPUStms) -> DistribM GPUStms -> DistribM GPUStms
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> KernelPath -> [Stm] -> DistribM GPUStms
transformStms KernelPath
path [Stm]
stms
    Just Stms SOACS
stms' ->
      KernelPath -> [Stm] -> DistribM GPUStms
transformStms KernelPath
path ([Stm] -> DistribM GPUStms) -> [Stm] -> DistribM GPUStms
forall a b. (a -> b) -> a -> b
$ Stms SOACS -> [Stm]
forall rep. Stms rep -> [Stm rep]
stmsToList Stms SOACS
stms' [Stm] -> [Stm] -> [Stm]
forall a. Semigroup a => a -> a -> a
<> [Stm]
stms

unbalancedLambda :: Lambda -> Bool
unbalancedLambda :: Lambda -> Bool
unbalancedLambda Lambda
orig_lam =
  Names -> BodyT SOACS -> Bool
forall rep rep. (Op rep ~ SOAC rep) => Names -> BodyT rep -> Bool
unbalancedBody ([VName] -> Names
namesFromList ([VName] -> Names) -> [VName] -> Names
forall a b. (a -> b) -> a -> b
$ (Param Type -> VName) -> [Param Type] -> [VName]
forall a b. (a -> b) -> [a] -> [b]
map Param Type -> VName
forall dec. Param dec -> VName
paramName ([Param Type] -> [VName]) -> [Param Type] -> [VName]
forall a b. (a -> b) -> a -> b
$ Lambda -> [LParam SOACS]
forall rep. LambdaT rep -> [LParam rep]
lambdaParams Lambda
orig_lam) (BodyT SOACS -> Bool) -> BodyT SOACS -> Bool
forall a b. (a -> b) -> a -> b
$
    Lambda -> BodyT SOACS
forall rep. LambdaT rep -> BodyT rep
lambdaBody Lambda
orig_lam
  where
    subExpBound :: SubExp -> Names -> Bool
subExpBound (Var VName
i) Names
bound = VName
i VName -> Names -> Bool
`nameIn` Names
bound
    subExpBound (Constant PrimValue
_) Names
_ = Bool
False

    unbalancedBody :: Names -> BodyT rep -> Bool
unbalancedBody Names
bound BodyT rep
body =
      (Stm rep -> Bool) -> Seq (Stm rep) -> Bool
forall (t :: * -> *) a. Foldable t => (a -> Bool) -> t a -> Bool
any (Names -> ExpT rep -> Bool
unbalancedStm (Names
bound Names -> Names -> Names
forall a. Semigroup a => a -> a -> a
<> BodyT rep -> Names
forall rep. Body rep -> Names
boundInBody BodyT rep
body) (ExpT rep -> Bool) -> (Stm rep -> ExpT rep) -> Stm rep -> Bool
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Stm rep -> ExpT rep
forall rep. Stm rep -> Exp rep
stmExp) (Seq (Stm rep) -> Bool) -> Seq (Stm rep) -> Bool
forall a b. (a -> b) -> a -> b
$
        BodyT rep -> Seq (Stm rep)
forall rep. BodyT rep -> Stms rep
bodyStms BodyT rep
body

    -- XXX - our notion of balancing is probably still too naive.
    unbalancedStm :: Names -> ExpT rep -> Bool
unbalancedStm Names
bound (Op (Stream w _ _ _ _)) =
      SubExp
w SubExp -> Names -> Bool
`subExpBound` Names
bound
    unbalancedStm Names
bound (Op (Screma w _ _)) =
      SubExp
w SubExp -> Names -> Bool
`subExpBound` Names
bound
    unbalancedStm Names
_ Op {} =
      Bool
False
    unbalancedStm Names
_ DoLoop {} = Bool
False
    unbalancedStm Names
bound (WithAcc [WithAccInput rep]
_ Lambda rep
lam) =
      Names -> BodyT rep -> Bool
unbalancedBody Names
bound (Lambda rep -> BodyT rep
forall rep. LambdaT rep -> BodyT rep
lambdaBody Lambda rep
lam)
    unbalancedStm Names
bound (If SubExp
cond BodyT rep
tbranch BodyT rep
fbranch IfDec (BranchType rep)
_) =
      SubExp
cond SubExp -> Names -> Bool
`subExpBound` Names
bound
        Bool -> Bool -> Bool
&& (Names -> BodyT rep -> Bool
unbalancedBody Names
bound BodyT rep
tbranch Bool -> Bool -> Bool
|| Names -> BodyT rep -> Bool
unbalancedBody Names
bound BodyT rep
fbranch)
    unbalancedStm Names
_ (BasicOp BasicOp
_) =
      Bool
False
    unbalancedStm Names
_ (Apply Name
fname [(SubExp, Diet)]
_ [RetType rep]
_ (Safety, SrcLoc, [SrcLoc])
_) =
      Bool -> Bool
not (Bool -> Bool) -> Bool -> Bool
forall a b. (a -> b) -> a -> b
$ Name -> Bool
isBuiltInFunction Name
fname

sequentialisedUnbalancedStm :: Stm -> DistribM (Maybe (Stms SOACS))
sequentialisedUnbalancedStm :: Stm -> DistribM (Maybe (Stms SOACS))
sequentialisedUnbalancedStm (Let Pat SOACS
pat StmAux (ExpDec SOACS)
_ (Op soac :: Op SOACS
soac@(Screma _ _ form)))
  | Just ([Reduce SOACS]
_, Lambda
lam2) <- ScremaForm SOACS -> Maybe ([Reduce SOACS], Lambda)
forall rep. ScremaForm rep -> Maybe ([Reduce rep], Lambda rep)
isRedomapSOAC ScremaForm SOACS
form,
    Lambda -> Bool
unbalancedLambda Lambda
lam2,
    Lambda -> Bool
lambdaContainsParallelism Lambda
lam2 = do
    Scope SOACS
types <- (Scope GPU -> Scope SOACS) -> DistribM (Scope SOACS)
forall rep (m :: * -> *) a.
HasScope rep m =>
(Scope rep -> a) -> m a
asksScope Scope GPU -> Scope SOACS
scopeForSOACs
    Stms SOACS -> Maybe (Stms SOACS)
forall a. a -> Maybe a
Just (Stms SOACS -> Maybe (Stms SOACS))
-> (((), Stms SOACS) -> Stms SOACS)
-> ((), Stms SOACS)
-> Maybe (Stms SOACS)
forall b c a. (b -> c) -> (a -> b) -> a -> c
. ((), Stms SOACS) -> Stms SOACS
forall a b. (a, b) -> b
snd (((), Stms SOACS) -> Maybe (Stms SOACS))
-> DistribM ((), Stms SOACS) -> DistribM (Maybe (Stms SOACS))
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> BuilderT SOACS DistribM ()
-> Scope SOACS -> DistribM ((), Stms SOACS)
forall (m :: * -> *) rep a.
MonadFreshNames m =>
BuilderT rep m a -> Scope rep -> m (a, Stms rep)
runBuilderT (Pat (Rep (BuilderT SOACS DistribM))
-> SOAC (Rep (BuilderT SOACS DistribM))
-> BuilderT SOACS DistribM ()
forall (m :: * -> *).
Transformer m =>
Pat (Rep m) -> SOAC (Rep m) -> m ()
FOT.transformSOAC Pat (Rep (BuilderT SOACS DistribM))
Pat SOACS
pat Op SOACS
SOAC (Rep (BuilderT SOACS DistribM))
soac) Scope SOACS
types
sequentialisedUnbalancedStm Stm
_ =
  Maybe (Stms SOACS) -> DistribM (Maybe (Stms SOACS))
forall (m :: * -> *) a. Monad m => a -> m a
return Maybe (Stms SOACS)
forall a. Maybe a
Nothing

cmpSizeLe ::
  String ->
  Out.SizeClass ->
  [SubExp] ->
  DistribM ((SubExp, Name), Out.Stms Out.GPU)
cmpSizeLe :: String
-> SizeClass -> [SubExp] -> DistribM ((SubExp, Name), GPUStms)
cmpSizeLe String
desc SizeClass
size_class [SubExp]
to_what = do
  Int
x <- (State -> Int) -> DistribM Int
forall s (m :: * -> *) a. MonadState s m => (s -> a) -> m a
gets State -> Int
stateThresholdCounter
  (State -> State) -> DistribM ()
forall s (m :: * -> *). MonadState s m => (s -> s) -> m ()
modify ((State -> State) -> DistribM ())
-> (State -> State) -> DistribM ()
forall a b. (a -> b) -> a -> b
$ \State
s -> State
s {stateThresholdCounter :: Int
stateThresholdCounter = Int
x Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
1}
  let size_key :: Name
size_key = String -> Name
nameFromString (String -> Name) -> String -> Name
forall a b. (a -> b) -> a -> b
$ String
desc String -> String -> String
forall a. [a] -> [a] -> [a]
++ String
"_" String -> String -> String
forall a. [a] -> [a] -> [a]
++ Int -> String
forall a. Show a => a -> String
show Int
x
  Builder GPU (SubExp, Name) -> DistribM ((SubExp, Name), GPUStms)
forall (m :: * -> *) somerep rep a.
(MonadFreshNames m, HasScope somerep m, SameScope somerep rep) =>
Builder rep a -> m (a, Stms rep)
runBuilder (Builder GPU (SubExp, Name) -> DistribM ((SubExp, Name), GPUStms))
-> Builder GPU (SubExp, Name) -> DistribM ((SubExp, Name), GPUStms)
forall a b. (a -> b) -> a -> b
$ do
    SubExp
to_what' <-
      String
-> Exp (Rep (BuilderT GPU (State VNameSource)))
-> BuilderT GPU (State VNameSource) SubExp
forall (m :: * -> *).
MonadBuilder m =>
String -> Exp (Rep m) -> m SubExp
letSubExp String
"comparatee"
        (ExpT GPU -> BuilderT GPU (State VNameSource) SubExp)
-> BuilderT GPU (State VNameSource) (ExpT GPU)
-> BuilderT GPU (State VNameSource) SubExp
forall (m :: * -> *) a b. Monad m => (a -> m b) -> m a -> m b
=<< BinOp
-> SubExp
-> [SubExp]
-> BuilderT
     GPU
     (State VNameSource)
     (Exp (Rep (BuilderT GPU (State VNameSource))))
forall (m :: * -> *).
MonadBuilder m =>
BinOp -> SubExp -> [SubExp] -> m (Exp (Rep m))
foldBinOp (IntType -> Overflow -> BinOp
Mul IntType
Int64 Overflow
OverflowUndef) (IntType -> Integer -> SubExp
intConst IntType
Int64 Integer
1) [SubExp]
to_what
    SubExp
cmp_res <- String
-> Exp (Rep (BuilderT GPU (State VNameSource)))
-> BuilderT GPU (State VNameSource) SubExp
forall (m :: * -> *).
MonadBuilder m =>
String -> Exp (Rep m) -> m SubExp
letSubExp String
desc (Exp (Rep (BuilderT GPU (State VNameSource)))
 -> BuilderT GPU (State VNameSource) SubExp)
-> Exp (Rep (BuilderT GPU (State VNameSource)))
-> BuilderT GPU (State VNameSource) SubExp
forall a b. (a -> b) -> a -> b
$ Op GPU -> ExpT GPU
forall rep. Op rep -> ExpT rep
Op (Op GPU -> ExpT GPU) -> Op GPU -> ExpT GPU
forall a b. (a -> b) -> a -> b
$ SizeOp -> HostOp GPU (SOAC GPU)
forall rep op. SizeOp -> HostOp rep op
SizeOp (SizeOp -> HostOp GPU (SOAC GPU))
-> SizeOp -> HostOp GPU (SOAC GPU)
forall a b. (a -> b) -> a -> b
$ Name -> SizeClass -> SubExp -> SizeOp
CmpSizeLe Name
size_key SizeClass
size_class SubExp
to_what'
    (SubExp, Name) -> Builder GPU (SubExp, Name)
forall (m :: * -> *) a. Monad m => a -> m a
return (SubExp
cmp_res, Name
size_key)

kernelAlternatives ::
  (MonadFreshNames m, HasScope Out.GPU m) =>
  Out.Pat Out.GPU ->
  Out.Body Out.GPU ->
  [(SubExp, Out.Body Out.GPU)] ->
  m (Out.Stms Out.GPU)
kernelAlternatives :: Pat GPU -> Body GPU -> [(SubExp, Body GPU)] -> m GPUStms
kernelAlternatives Pat GPU
pat Body GPU
default_body [] = Builder GPU () -> m GPUStms
forall (m :: * -> *) somerep rep a.
(MonadFreshNames m, HasScope somerep m, SameScope somerep rep) =>
Builder rep a -> m (Stms rep)
runBuilder_ (Builder GPU () -> m GPUStms) -> Builder GPU () -> m GPUStms
forall a b. (a -> b) -> a -> b
$ do
  Result
ses <- Body (Rep (BuilderT GPU (State VNameSource)))
-> BuilderT GPU (State VNameSource) Result
forall (m :: * -> *). MonadBuilder m => Body (Rep m) -> m Result
bodyBind Body (Rep (BuilderT GPU (State VNameSource)))
Body GPU
default_body
  [(VName, SubExpRes)]
-> ((VName, SubExpRes) -> Builder GPU ()) -> Builder GPU ()
forall (t :: * -> *) (m :: * -> *) a b.
(Foldable t, Monad m) =>
t a -> (a -> m b) -> m ()
forM_ ([VName] -> Result -> [(VName, SubExpRes)]
forall a b. [a] -> [b] -> [(a, b)]
zip (PatT Type -> [VName]
forall dec. PatT dec -> [VName]
patNames PatT Type
Pat GPU
pat) Result
ses) (((VName, SubExpRes) -> Builder GPU ()) -> Builder GPU ())
-> ((VName, SubExpRes) -> Builder GPU ()) -> Builder GPU ()
forall a b. (a -> b) -> a -> b
$ \(VName
name, SubExpRes Certs
cs SubExp
se) ->
    Certs -> Builder GPU () -> Builder GPU ()
forall (m :: * -> *) a. MonadBuilder m => Certs -> m a -> m a
certifying Certs
cs (Builder GPU () -> Builder GPU ())
-> Builder GPU () -> Builder GPU ()
forall a b. (a -> b) -> a -> b
$ [VName]
-> Exp (Rep (BuilderT GPU (State VNameSource))) -> Builder GPU ()
forall (m :: * -> *).
MonadBuilder m =>
[VName] -> Exp (Rep m) -> m ()
letBindNames [VName
name] (Exp (Rep (BuilderT GPU (State VNameSource))) -> Builder GPU ())
-> Exp (Rep (BuilderT GPU (State VNameSource))) -> Builder GPU ()
forall a b. (a -> b) -> a -> b
$ BasicOp -> ExpT GPU
forall rep. BasicOp -> ExpT rep
BasicOp (BasicOp -> ExpT GPU) -> BasicOp -> ExpT GPU
forall a b. (a -> b) -> a -> b
$ SubExp -> BasicOp
SubExp SubExp
se
kernelAlternatives Pat GPU
pat Body GPU
default_body ((SubExp
cond, Body GPU
alt) : [(SubExp, Body GPU)]
alts) = Builder GPU () -> m GPUStms
forall (m :: * -> *) somerep rep a.
(MonadFreshNames m, HasScope somerep m, SameScope somerep rep) =>
Builder rep a -> m (Stms rep)
runBuilder_ (Builder GPU () -> m GPUStms) -> Builder GPU () -> m GPUStms
forall a b. (a -> b) -> a -> b
$ do
  PatT Type
alts_pat <- ([PatElemT Type] -> PatT Type)
-> BuilderT GPU (State VNameSource) [PatElemT Type]
-> BuilderT GPU (State VNameSource) (PatT Type)
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap [PatElemT Type] -> PatT Type
forall dec. [PatElemT dec] -> PatT dec
Pat (BuilderT GPU (State VNameSource) [PatElemT Type]
 -> BuilderT GPU (State VNameSource) (PatT Type))
-> ((PatElemT Type
     -> BuilderT GPU (State VNameSource) (PatElemT Type))
    -> BuilderT GPU (State VNameSource) [PatElemT Type])
-> (PatElemT Type
    -> BuilderT GPU (State VNameSource) (PatElemT Type))
-> BuilderT GPU (State VNameSource) (PatT Type)
forall b c a. (b -> c) -> (a -> b) -> a -> c
. [PatElemT Type]
-> (PatElemT Type
    -> BuilderT GPU (State VNameSource) (PatElemT Type))
-> BuilderT GPU (State VNameSource) [PatElemT Type]
forall (t :: * -> *) (m :: * -> *) a b.
(Traversable t, Monad m) =>
t a -> (a -> m b) -> m (t b)
forM (PatT Type -> [PatElemT Type]
forall dec. PatT dec -> [PatElemT dec]
patElems PatT Type
Pat GPU
pat) ((PatElemT Type
  -> BuilderT GPU (State VNameSource) (PatElemT Type))
 -> BuilderT GPU (State VNameSource) (PatT Type))
-> (PatElemT Type
    -> BuilderT GPU (State VNameSource) (PatElemT Type))
-> BuilderT GPU (State VNameSource) (PatT Type)
forall a b. (a -> b) -> a -> b
$ \PatElemT Type
pe -> do
    VName
name <- String -> BuilderT GPU (State VNameSource) VName
forall (m :: * -> *). MonadFreshNames m => String -> m VName
newVName (String -> BuilderT GPU (State VNameSource) VName)
-> String -> BuilderT GPU (State VNameSource) VName
forall a b. (a -> b) -> a -> b
$ VName -> String
baseString (VName -> String) -> VName -> String
forall a b. (a -> b) -> a -> b
$ PatElemT Type -> VName
forall dec. PatElemT dec -> VName
patElemName PatElemT Type
pe
    PatElemT Type -> BuilderT GPU (State VNameSource) (PatElemT Type)
forall (m :: * -> *) a. Monad m => a -> m a
return PatElemT Type
pe {patElemName :: VName
patElemName = VName
name}

  GPUStms
alt_stms <- Pat GPU
-> Body GPU
-> [(SubExp, Body GPU)]
-> BuilderT GPU (State VNameSource) GPUStms
forall (m :: * -> *).
(MonadFreshNames m, HasScope GPU m) =>
Pat GPU -> Body GPU -> [(SubExp, Body GPU)] -> m GPUStms
kernelAlternatives PatT Type
Pat GPU
alts_pat Body GPU
default_body [(SubExp, Body GPU)]
alts
  let alt_body :: Body GPU
alt_body = GPUStms -> Result -> Body GPU
forall rep. Buildable rep => Stms rep -> Result -> Body rep
mkBody GPUStms
alt_stms (Result -> Body GPU) -> Result -> Body GPU
forall a b. (a -> b) -> a -> b
$ [VName] -> Result
varsRes ([VName] -> Result) -> [VName] -> Result
forall a b. (a -> b) -> a -> b
$ PatT Type -> [VName]
forall dec. PatT dec -> [VName]
patNames PatT Type
alts_pat

  Pat (Rep (BuilderT GPU (State VNameSource)))
-> Exp (Rep (BuilderT GPU (State VNameSource))) -> Builder GPU ()
forall (m :: * -> *).
MonadBuilder m =>
Pat (Rep m) -> Exp (Rep m) -> m ()
letBind Pat (Rep (BuilderT GPU (State VNameSource)))
Pat GPU
pat (Exp (Rep (BuilderT GPU (State VNameSource))) -> Builder GPU ())
-> Exp (Rep (BuilderT GPU (State VNameSource))) -> Builder GPU ()
forall a b. (a -> b) -> a -> b
$
    SubExp
-> Body GPU -> Body GPU -> IfDec (BranchType GPU) -> ExpT GPU
forall rep.
SubExp
-> BodyT rep -> BodyT rep -> IfDec (BranchType rep) -> ExpT rep
If SubExp
cond Body GPU
alt Body GPU
alt_body (IfDec (BranchType GPU) -> ExpT GPU)
-> IfDec (BranchType GPU) -> ExpT GPU
forall a b. (a -> b) -> a -> b
$
      [TypeBase ExtShape NoUniqueness]
-> IfSort -> IfDec (TypeBase ExtShape NoUniqueness)
forall rt. [rt] -> IfSort -> IfDec rt
IfDec ([Type] -> [TypeBase ExtShape NoUniqueness]
forall u. [TypeBase Shape u] -> [TypeBase ExtShape u]
staticShapes (PatT Type -> [Type]
forall dec. Typed dec => PatT dec -> [Type]
patTypes PatT Type
Pat GPU
pat)) IfSort
IfEquiv

transformLambda :: KernelPath -> Lambda -> DistribM (Out.Lambda Out.GPU)
transformLambda :: KernelPath -> Lambda -> DistribM (Lambda GPU)
transformLambda KernelPath
path (Lambda [LParam SOACS]
params BodyT SOACS
body [Type]
ret) =
  [LParam GPU] -> Body GPU -> [Type] -> Lambda GPU
forall rep. [LParam rep] -> BodyT rep -> [Type] -> LambdaT rep
Lambda [LParam SOACS]
[LParam GPU]
params
    (Body GPU -> [Type] -> Lambda GPU)
-> DistribM (Body GPU) -> DistribM ([Type] -> Lambda GPU)
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> Scope GPU -> DistribM (Body GPU) -> DistribM (Body GPU)
forall rep (m :: * -> *) a.
LocalScope rep m =>
Scope rep -> m a -> m a
localScope ([Param Type] -> Scope GPU
forall rep dec. (LParamInfo rep ~ dec) => [Param dec] -> Scope rep
scopeOfLParams [Param Type]
[LParam SOACS]
params) (KernelPath -> BodyT SOACS -> DistribM (Body GPU)
transformBody KernelPath
path BodyT SOACS
body)
    DistribM ([Type] -> Lambda GPU)
-> DistribM [Type] -> DistribM (Lambda GPU)
forall (f :: * -> *) a b. Applicative f => f (a -> b) -> f a -> f b
<*> [Type] -> DistribM [Type]
forall (f :: * -> *) a. Applicative f => a -> f a
pure [Type]
ret

transformStm :: KernelPath -> Stm -> DistribM GPUStms
transformStm :: KernelPath -> Stm -> DistribM GPUStms
transformStm KernelPath
_ Stm
stm
  | Attr
"sequential" Attr -> Attrs -> Bool
`inAttrs` StmAux () -> Attrs
forall dec. StmAux dec -> Attrs
stmAuxAttrs (Stm -> StmAux (ExpDec SOACS)
forall rep. Stm rep -> StmAux (ExpDec rep)
stmAux Stm
stm) =
    Builder GPU () -> DistribM GPUStms
forall (m :: * -> *) somerep rep a.
(MonadFreshNames m, HasScope somerep m, SameScope somerep rep) =>
Builder rep a -> m (Stms rep)
runBuilder_ (Builder GPU () -> DistribM GPUStms)
-> Builder GPU () -> DistribM GPUStms
forall a b. (a -> b) -> a -> b
$ Stm -> Builder GPU ()
forall (m :: * -> *).
(Transformer m, LetDec (Rep m) ~ LetDec SOACS) =>
Stm -> m ()
FOT.transformStmRecursively Stm
stm
transformStm KernelPath
path (Let Pat SOACS
pat StmAux (ExpDec SOACS)
aux (Op Op SOACS
soac))
  | Attr
"sequential_outer" Attr -> Attrs -> Bool
`inAttrs` StmAux () -> Attrs
forall dec. StmAux dec -> Attrs
stmAuxAttrs StmAux ()
StmAux (ExpDec SOACS)
aux =
    KernelPath -> [Stm] -> DistribM GPUStms
transformStms KernelPath
path ([Stm] -> DistribM GPUStms)
-> (Stms SOACS -> [Stm]) -> Stms SOACS -> DistribM GPUStms
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Stms SOACS -> [Stm]
forall rep. Stms rep -> [Stm rep]
stmsToList (Stms SOACS -> [Stm])
-> (Stms SOACS -> Stms SOACS) -> Stms SOACS -> [Stm]
forall b c a. (b -> c) -> (a -> b) -> a -> c
. (Stm -> Stm) -> Stms SOACS -> Stms SOACS
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap (Certs -> Stm -> Stm
forall rep. Certs -> Stm rep -> Stm rep
certify (StmAux () -> Certs
forall dec. StmAux dec -> Certs
stmAuxCerts StmAux ()
StmAux (ExpDec SOACS)
aux))
      (Stms SOACS -> DistribM GPUStms)
-> DistribM (Stms SOACS) -> DistribM GPUStms
forall (m :: * -> *) a b. Monad m => (a -> m b) -> m a -> m b
=<< Builder SOACS () -> DistribM (Stms SOACS)
forall (m :: * -> *) somerep rep a.
(MonadFreshNames m, HasScope somerep m, SameScope somerep rep) =>
Builder rep a -> m (Stms rep)
runBuilder_ (Pat (Rep (BuilderT SOACS (State VNameSource)))
-> SOAC (Rep (BuilderT SOACS (State VNameSource)))
-> Builder SOACS ()
forall (m :: * -> *).
Transformer m =>
Pat (Rep m) -> SOAC (Rep m) -> m ()
FOT.transformSOAC Pat (Rep (BuilderT SOACS (State VNameSource)))
Pat SOACS
pat Op SOACS
SOAC (Rep (BuilderT SOACS (State VNameSource)))
soac)
transformStm KernelPath
path (Let Pat SOACS
pat StmAux (ExpDec SOACS)
aux (If SubExp
c BodyT SOACS
tb BodyT SOACS
fb IfDec (BranchType SOACS)
rt)) = do
  Body GPU
tb' <- KernelPath -> BodyT SOACS -> DistribM (Body GPU)
transformBody KernelPath
path BodyT SOACS
tb
  Body GPU
fb' <- KernelPath -> BodyT SOACS -> DistribM (Body GPU)
transformBody KernelPath
path BodyT SOACS
fb
  GPUStms -> DistribM GPUStms
forall (m :: * -> *) a. Monad m => a -> m a
return (GPUStms -> DistribM GPUStms) -> GPUStms -> DistribM GPUStms
forall a b. (a -> b) -> a -> b
$ Stm GPU -> GPUStms
forall rep. Stm rep -> Stms rep
oneStm (Stm GPU -> GPUStms) -> Stm GPU -> GPUStms
forall a b. (a -> b) -> a -> b
$ Pat GPU -> StmAux (ExpDec GPU) -> ExpT GPU -> Stm GPU
forall rep. Pat rep -> StmAux (ExpDec rep) -> Exp rep -> Stm rep
Let Pat SOACS
Pat GPU
pat StmAux (ExpDec SOACS)
StmAux (ExpDec GPU)
aux (ExpT GPU -> Stm GPU) -> ExpT GPU -> Stm GPU
forall a b. (a -> b) -> a -> b
$ SubExp
-> Body GPU -> Body GPU -> IfDec (BranchType GPU) -> ExpT GPU
forall rep.
SubExp
-> BodyT rep -> BodyT rep -> IfDec (BranchType rep) -> ExpT rep
If SubExp
c Body GPU
tb' Body GPU
fb' IfDec (BranchType SOACS)
IfDec (BranchType GPU)
rt
transformStm KernelPath
path (Let Pat SOACS
pat StmAux (ExpDec SOACS)
aux (WithAcc [WithAccInput SOACS]
inputs Lambda
lam)) =
  Stm GPU -> GPUStms
forall rep. Stm rep -> Stms rep
oneStm (Stm GPU -> GPUStms)
-> (ExpT GPU -> Stm GPU) -> ExpT GPU -> GPUStms
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Pat GPU -> StmAux (ExpDec GPU) -> ExpT GPU -> Stm GPU
forall rep. Pat rep -> StmAux (ExpDec rep) -> Exp rep -> Stm rep
Let Pat SOACS
Pat GPU
pat StmAux (ExpDec SOACS)
StmAux (ExpDec GPU)
aux
    (ExpT GPU -> GPUStms) -> DistribM (ExpT GPU) -> DistribM GPUStms
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> ([WithAccInput GPU] -> Lambda GPU -> ExpT GPU
forall rep. [WithAccInput rep] -> Lambda rep -> ExpT rep
WithAcc ((WithAccInput SOACS -> WithAccInput GPU)
-> [WithAccInput SOACS] -> [WithAccInput GPU]
forall a b. (a -> b) -> [a] -> [b]
map WithAccInput SOACS -> WithAccInput GPU
forall (f :: * -> *) (p :: * -> * -> *) a b c.
(Functor f, Bifunctor p) =>
(a, b, f (p Lambda c)) -> (a, b, f (p (Lambda GPU) c))
transformInput [WithAccInput SOACS]
inputs) (Lambda GPU -> ExpT GPU)
-> DistribM (Lambda GPU) -> DistribM (ExpT GPU)
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> KernelPath -> Lambda -> DistribM (Lambda GPU)
transformLambda KernelPath
path Lambda
lam)
  where
    transformInput :: (a, b, f (p Lambda c)) -> (a, b, f (p (Lambda GPU) c))
transformInput (a
shape, b
arrs, f (p Lambda c)
op) =
      (a
shape, b
arrs, (p Lambda c -> p (Lambda GPU) c)
-> f (p Lambda c) -> f (p (Lambda GPU) c)
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap ((Lambda -> Lambda GPU) -> p Lambda c -> p (Lambda GPU) c
forall (p :: * -> * -> *) a b c.
Bifunctor p =>
(a -> b) -> p a c -> p b c
first Lambda -> Lambda GPU
soacsLambdaToGPU) f (p Lambda c)
op)
transformStm KernelPath
path (Let Pat SOACS
pat StmAux (ExpDec SOACS)
aux (DoLoop [(FParam SOACS, SubExp)]
merge LoopForm SOACS
form BodyT SOACS
body)) =
  Scope GPU -> DistribM GPUStms -> DistribM GPUStms
forall rep (m :: * -> *) a.
LocalScope rep m =>
Scope rep -> m a -> m a
localScope (Scope SOACS -> Scope GPU
forall fromrep torep.
SameScope fromrep torep =>
Scope fromrep -> Scope torep
castScope (LoopForm SOACS -> Scope SOACS
forall rep a. Scoped rep a => a -> Scope rep
scopeOf LoopForm SOACS
form) Scope GPU -> Scope GPU -> Scope GPU
forall a. Semigroup a => a -> a -> a
<> [Param DeclType] -> Scope GPU
forall rep dec. (FParamInfo rep ~ dec) => [Param dec] -> Scope rep
scopeOfFParams [Param DeclType]
params) (DistribM GPUStms -> DistribM GPUStms)
-> DistribM GPUStms -> DistribM GPUStms
forall a b. (a -> b) -> a -> b
$
    Stm GPU -> GPUStms
forall rep. Stm rep -> Stms rep
oneStm (Stm GPU -> GPUStms)
-> (Body GPU -> Stm GPU) -> Body GPU -> GPUStms
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Pat GPU -> StmAux (ExpDec GPU) -> ExpT GPU -> Stm GPU
forall rep. Pat rep -> StmAux (ExpDec rep) -> Exp rep -> Stm rep
Let Pat SOACS
Pat GPU
pat StmAux (ExpDec SOACS)
StmAux (ExpDec GPU)
aux (ExpT GPU -> Stm GPU)
-> (Body GPU -> ExpT GPU) -> Body GPU -> Stm GPU
forall b c a. (b -> c) -> (a -> b) -> a -> c
. [(FParam GPU, SubExp)] -> LoopForm GPU -> Body GPU -> ExpT GPU
forall rep.
[(FParam rep, SubExp)] -> LoopForm rep -> BodyT rep -> ExpT rep
DoLoop [(FParam SOACS, SubExp)]
[(FParam GPU, SubExp)]
merge LoopForm GPU
form' (Body GPU -> GPUStms) -> DistribM (Body GPU) -> DistribM GPUStms
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> KernelPath -> BodyT SOACS -> DistribM (Body GPU)
transformBody KernelPath
path BodyT SOACS
body
  where
    params :: [Param DeclType]
params = ((Param DeclType, SubExp) -> Param DeclType)
-> [(Param DeclType, SubExp)] -> [Param DeclType]
forall a b. (a -> b) -> [a] -> [b]
map (Param DeclType, SubExp) -> Param DeclType
forall a b. (a, b) -> a
fst [(Param DeclType, SubExp)]
[(FParam SOACS, SubExp)]
merge
    form' :: LoopForm GPU
form' = case LoopForm SOACS
form of
      WhileLoop VName
cond ->
        VName -> LoopForm GPU
forall rep. VName -> LoopForm rep
WhileLoop VName
cond
      ForLoop VName
i IntType
it SubExp
bound [(LParam SOACS, VName)]
ps ->
        VName -> IntType -> SubExp -> [(LParam GPU, VName)] -> LoopForm GPU
forall rep.
VName -> IntType -> SubExp -> [(LParam rep, VName)] -> LoopForm rep
ForLoop VName
i IntType
it SubExp
bound [(LParam SOACS, VName)]
[(LParam GPU, VName)]
ps
transformStm KernelPath
path (Let Pat SOACS
pat StmAux (ExpDec SOACS)
aux (Op (Screma w arrs form)))
  | Just Lambda
lam <- ScremaForm SOACS -> Maybe Lambda
forall rep. ScremaForm rep -> Maybe (Lambda rep)
isMapSOAC ScremaForm SOACS
form =
    KernelPath -> MapLoop -> DistribM GPUStms
onMap KernelPath
path (MapLoop -> DistribM GPUStms) -> MapLoop -> DistribM GPUStms
forall a b. (a -> b) -> a -> b
$ Pat SOACS -> StmAux () -> SubExp -> Lambda -> [VName] -> MapLoop
MapLoop Pat SOACS
pat StmAux ()
StmAux (ExpDec SOACS)
aux SubExp
w Lambda
lam [VName]
arrs
transformStm KernelPath
path (Let Pat SOACS
res_pat (StmAux Certs
cs Attrs
_ ExpDec SOACS
_) (Op (Screma w arrs form)))
  | Just [Scan SOACS]
scans <- ScremaForm SOACS -> Maybe [Scan SOACS]
forall rep. ScremaForm rep -> Maybe [Scan rep]
isScanSOAC ScremaForm SOACS
form,
    Scan Lambda
scan_lam [SubExp]
nes <- [Scan SOACS] -> Scan SOACS
forall rep. Buildable rep => [Scan rep] -> Scan rep
singleScan [Scan SOACS]
scans,
    Just BuilderT SOACS DistribM ()
do_iswim <- Pat SOACS
-> SubExp
-> Lambda
-> [(SubExp, VName)]
-> Maybe (BuilderT SOACS DistribM ())
forall (m :: * -> *).
(MonadBuilder m, Rep m ~ SOACS) =>
Pat SOACS -> SubExp -> Lambda -> [(SubExp, VName)] -> Maybe (m ())
iswim Pat SOACS
res_pat SubExp
w Lambda
scan_lam ([(SubExp, VName)] -> Maybe (BuilderT SOACS DistribM ()))
-> [(SubExp, VName)] -> Maybe (BuilderT SOACS DistribM ())
forall a b. (a -> b) -> a -> b
$ [SubExp] -> [VName] -> [(SubExp, VName)]
forall a b. [a] -> [b] -> [(a, b)]
zip [SubExp]
nes [VName]
arrs = do
    Scope SOACS
types <- (Scope GPU -> Scope SOACS) -> DistribM (Scope SOACS)
forall rep (m :: * -> *) a.
HasScope rep m =>
(Scope rep -> a) -> m a
asksScope Scope GPU -> Scope SOACS
scopeForSOACs
    KernelPath -> [Stm] -> DistribM GPUStms
transformStms KernelPath
path ([Stm] -> DistribM GPUStms)
-> (((), Stms SOACS) -> [Stm])
-> ((), Stms SOACS)
-> DistribM GPUStms
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Stms SOACS -> [Stm]
forall rep. Stms rep -> [Stm rep]
stmsToList (Stms SOACS -> [Stm])
-> (((), Stms SOACS) -> Stms SOACS) -> ((), Stms SOACS) -> [Stm]
forall b c a. (b -> c) -> (a -> b) -> a -> c
. ((), Stms SOACS) -> Stms SOACS
forall a b. (a, b) -> b
snd (((), Stms SOACS) -> DistribM GPUStms)
-> DistribM ((), Stms SOACS) -> DistribM GPUStms
forall (m :: * -> *) a b. Monad m => (a -> m b) -> m a -> m b
=<< BuilderT SOACS DistribM ()
-> Scope SOACS -> DistribM ((), Stms SOACS)
forall (m :: * -> *) rep a.
MonadFreshNames m =>
BuilderT rep m a -> Scope rep -> m (a, Stms rep)
runBuilderT (Certs -> BuilderT SOACS DistribM () -> BuilderT SOACS DistribM ()
forall (m :: * -> *) a. MonadBuilder m => Certs -> m a -> m a
certifying Certs
cs BuilderT SOACS DistribM ()
do_iswim) Scope SOACS
types
  | Just ([Scan SOACS]
scans, Lambda
map_lam) <- ScremaForm SOACS -> Maybe ([Scan SOACS], Lambda)
forall rep. ScremaForm rep -> Maybe ([Scan rep], Lambda rep)
isScanomapSOAC ScremaForm SOACS
form = Builder GPU () -> DistribM GPUStms
forall (m :: * -> *) somerep rep a.
(MonadFreshNames m, HasScope somerep m, SameScope somerep rep) =>
Builder rep a -> m (Stms rep)
runBuilder_ (Builder GPU () -> DistribM GPUStms)
-> Builder GPU () -> DistribM GPUStms
forall a b. (a -> b) -> a -> b
$ do
    [SegBinOp GPU]
scan_ops <- [Scan SOACS]
-> (Scan SOACS -> BuilderT GPU (State VNameSource) (SegBinOp GPU))
-> BuilderT GPU (State VNameSource) [SegBinOp GPU]
forall (t :: * -> *) (m :: * -> *) a b.
(Traversable t, Monad m) =>
t a -> (a -> m b) -> m (t b)
forM [Scan SOACS]
scans ((Scan SOACS -> BuilderT GPU (State VNameSource) (SegBinOp GPU))
 -> BuilderT GPU (State VNameSource) [SegBinOp GPU])
-> (Scan SOACS -> BuilderT GPU (State VNameSource) (SegBinOp GPU))
-> BuilderT GPU (State VNameSource) [SegBinOp GPU]
forall a b. (a -> b) -> a -> b
$ \(Scan Lambda
scan_lam [SubExp]
nes) -> do
      (Lambda
scan_lam', [SubExp]
nes', Shape
shape) <- Lambda
-> [SubExp]
-> BuilderT GPU (State VNameSource) (Lambda, [SubExp], Shape)
forall (m :: * -> *).
MonadBuilder m =>
Lambda -> [SubExp] -> m (Lambda, [SubExp], Shape)
determineReduceOp Lambda
scan_lam [SubExp]
nes
      let scan_lam'' :: Lambda GPU
scan_lam'' = Lambda -> Lambda GPU
soacsLambdaToGPU Lambda
scan_lam'
      SegBinOp GPU -> BuilderT GPU (State VNameSource) (SegBinOp GPU)
forall (m :: * -> *) a. Monad m => a -> m a
return (SegBinOp GPU -> BuilderT GPU (State VNameSource) (SegBinOp GPU))
-> SegBinOp GPU -> BuilderT GPU (State VNameSource) (SegBinOp GPU)
forall a b. (a -> b) -> a -> b
$ Commutativity -> Lambda GPU -> [SubExp] -> Shape -> SegBinOp GPU
forall rep.
Commutativity -> Lambda rep -> [SubExp] -> Shape -> SegBinOp rep
SegBinOp Commutativity
Noncommutative Lambda GPU
scan_lam'' [SubExp]
nes' Shape
shape
    let map_lam_sequential :: Lambda GPU
map_lam_sequential = Lambda -> Lambda GPU
soacsLambdaToGPU Lambda
map_lam
    SegLevel
lvl <- MkSegLevel GPU (State VNameSource)
forall (m :: * -> *). MonadFreshNames m => MkSegLevel GPU m
segThreadCapped [SubExp
w] String
"segscan" (ThreadRecommendation
 -> BuilderT GPU (State VNameSource) (SegOpLevel GPU))
-> ThreadRecommendation
-> BuilderT GPU (State VNameSource) (SegOpLevel GPU)
forall a b. (a -> b) -> a -> b
$ SegVirt -> ThreadRecommendation
NoRecommendation SegVirt
SegNoVirt
    GPUStms -> Builder GPU ()
forall (m :: * -> *). MonadBuilder m => Stms (Rep m) -> m ()
addStms (GPUStms -> Builder GPU ())
-> (GPUStms -> GPUStms) -> GPUStms -> Builder GPU ()
forall b c a. (b -> c) -> (a -> b) -> a -> c
. (Stm GPU -> Stm GPU) -> GPUStms -> GPUStms
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap (Certs -> Stm GPU -> Stm GPU
forall rep. Certs -> Stm rep -> Stm rep
certify Certs
cs)
      (GPUStms -> Builder GPU ())
-> BuilderT GPU (State VNameSource) GPUStms -> Builder GPU ()
forall (m :: * -> *) a b. Monad m => (a -> m b) -> m a -> m b
=<< SegOpLevel GPU
-> Pat GPU
-> Certs
-> SubExp
-> [SegBinOp GPU]
-> Lambda GPU
-> [VName]
-> [(VName, SubExp)]
-> [KernelInput]
-> BuilderT GPU (State VNameSource) GPUStms
forall (m :: * -> *) rep.
(MonadFreshNames m, DistRep rep, HasScope rep m) =>
SegOpLevel rep
-> Pat rep
-> Certs
-> SubExp
-> [SegBinOp rep]
-> Lambda rep
-> [VName]
-> [(VName, SubExp)]
-> [KernelInput]
-> m (Stms rep)
segScan SegOpLevel GPU
SegLevel
lvl Pat SOACS
Pat GPU
res_pat Certs
forall a. Monoid a => a
mempty SubExp
w [SegBinOp GPU]
scan_ops Lambda GPU
map_lam_sequential [VName]
arrs [] []
transformStm KernelPath
path (Let Pat SOACS
res_pat StmAux (ExpDec SOACS)
aux (Op (Screma w arrs form)))
  | Just [Reduce Commutativity
comm Lambda
red_fun [SubExp]
nes] <- ScremaForm SOACS -> Maybe [Reduce SOACS]
forall rep. ScremaForm rep -> Maybe [Reduce rep]
isReduceSOAC ScremaForm SOACS
form,
    let comm' :: Commutativity
comm'
          | Lambda -> Bool
forall rep. Lambda rep -> Bool
commutativeLambda Lambda
red_fun = Commutativity
Commutative
          | Bool
otherwise = Commutativity
comm,
    Just BuilderT SOACS DistribM ()
do_irwim <- Pat SOACS
-> SubExp
-> Commutativity
-> Lambda
-> [(SubExp, VName)]
-> Maybe (BuilderT SOACS DistribM ())
forall (m :: * -> *).
(MonadBuilder m, Rep m ~ SOACS) =>
Pat SOACS
-> SubExp
-> Commutativity
-> Lambda
-> [(SubExp, VName)]
-> Maybe (m ())
irwim Pat SOACS
res_pat SubExp
w Commutativity
comm' Lambda
red_fun ([(SubExp, VName)] -> Maybe (BuilderT SOACS DistribM ()))
-> [(SubExp, VName)] -> Maybe (BuilderT SOACS DistribM ())
forall a b. (a -> b) -> a -> b
$ [SubExp] -> [VName] -> [(SubExp, VName)]
forall a b. [a] -> [b] -> [(a, b)]
zip [SubExp]
nes [VName]
arrs = do
    Scope SOACS
types <- (Scope GPU -> Scope SOACS) -> DistribM (Scope SOACS)
forall rep (m :: * -> *) a.
HasScope rep m =>
(Scope rep -> a) -> m a
asksScope Scope GPU -> Scope SOACS
scopeForSOACs
    Stms SOACS
stms <- (Stms SOACS, Stms SOACS) -> Stms SOACS
forall a b. (a, b) -> a
fst ((Stms SOACS, Stms SOACS) -> Stms SOACS)
-> DistribM (Stms SOACS, Stms SOACS) -> DistribM (Stms SOACS)
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> BuilderT SOACS DistribM (Stms SOACS)
-> Scope SOACS -> DistribM (Stms SOACS, Stms SOACS)
forall (m :: * -> *) rep a.
MonadFreshNames m =>
BuilderT rep m a -> Scope rep -> m (a, Stms rep)
runBuilderT (Stms SOACS -> BuilderT SOACS DistribM (Stms SOACS)
forall (m :: * -> *).
(HasScope SOACS m, MonadFreshNames m) =>
Stms SOACS -> m (Stms SOACS)
simplifyStms (Stms SOACS -> BuilderT SOACS DistribM (Stms SOACS))
-> BuilderT SOACS DistribM (Stms SOACS)
-> BuilderT SOACS DistribM (Stms SOACS)
forall (m :: * -> *) a b. Monad m => (a -> m b) -> m a -> m b
=<< BuilderT SOACS DistribM ()
-> BuilderT SOACS DistribM (Stms (Rep (BuilderT SOACS DistribM)))
forall (m :: * -> *) a. MonadBuilder m => m a -> m (Stms (Rep m))
collectStms_ (StmAux ()
-> BuilderT SOACS DistribM () -> BuilderT SOACS DistribM ()
forall (m :: * -> *) anyrep a.
MonadBuilder m =>
StmAux anyrep -> m a -> m a
auxing StmAux ()
StmAux (ExpDec SOACS)
aux BuilderT SOACS DistribM ()
do_irwim)) Scope SOACS
types
    KernelPath -> [Stm] -> DistribM GPUStms
transformStms KernelPath
path ([Stm] -> DistribM GPUStms) -> [Stm] -> DistribM GPUStms
forall a b. (a -> b) -> a -> b
$ Stms SOACS -> [Stm]
forall rep. Stms rep -> [Stm rep]
stmsToList Stms SOACS
stms
transformStm KernelPath
path (Let Pat SOACS
pat aux :: StmAux (ExpDec SOACS)
aux@(StmAux Certs
cs Attrs
_ ExpDec SOACS
_) (Op (Screma w arrs form)))
  | Just ([Reduce SOACS]
reds, Lambda
map_lam) <- ScremaForm SOACS -> Maybe ([Reduce SOACS], Lambda)
forall rep. ScremaForm rep -> Maybe ([Reduce rep], Lambda rep)
isRedomapSOAC ScremaForm SOACS
form = do
    let paralleliseOuter :: DistribM GPUStms
paralleliseOuter = Builder GPU () -> DistribM GPUStms
forall (m :: * -> *) somerep rep a.
(MonadFreshNames m, HasScope somerep m, SameScope somerep rep) =>
Builder rep a -> m (Stms rep)
runBuilder_ (Builder GPU () -> DistribM GPUStms)
-> Builder GPU () -> DistribM GPUStms
forall a b. (a -> b) -> a -> b
$ do
          [SegBinOp GPU]
red_ops <- [Reduce SOACS]
-> (Reduce SOACS
    -> BuilderT GPU (State VNameSource) (SegBinOp GPU))
-> BuilderT GPU (State VNameSource) [SegBinOp GPU]
forall (t :: * -> *) (m :: * -> *) a b.
(Traversable t, Monad m) =>
t a -> (a -> m b) -> m (t b)
forM [Reduce SOACS]
reds ((Reduce SOACS -> BuilderT GPU (State VNameSource) (SegBinOp GPU))
 -> BuilderT GPU (State VNameSource) [SegBinOp GPU])
-> (Reduce SOACS
    -> BuilderT GPU (State VNameSource) (SegBinOp GPU))
-> BuilderT GPU (State VNameSource) [SegBinOp GPU]
forall a b. (a -> b) -> a -> b
$ \(Reduce Commutativity
comm Lambda
red_lam [SubExp]
nes) -> do
            (Lambda
red_lam', [SubExp]
nes', Shape
shape) <- Lambda
-> [SubExp]
-> BuilderT GPU (State VNameSource) (Lambda, [SubExp], Shape)
forall (m :: * -> *).
MonadBuilder m =>
Lambda -> [SubExp] -> m (Lambda, [SubExp], Shape)
determineReduceOp Lambda
red_lam [SubExp]
nes
            let comm' :: Commutativity
comm'
                  | Lambda -> Bool
forall rep. Lambda rep -> Bool
commutativeLambda Lambda
red_lam' = Commutativity
Commutative
                  | Bool
otherwise = Commutativity
comm
                red_lam'' :: Lambda GPU
red_lam'' = Lambda -> Lambda GPU
soacsLambdaToGPU Lambda
red_lam'
            SegBinOp GPU -> BuilderT GPU (State VNameSource) (SegBinOp GPU)
forall (m :: * -> *) a. Monad m => a -> m a
return (SegBinOp GPU -> BuilderT GPU (State VNameSource) (SegBinOp GPU))
-> SegBinOp GPU -> BuilderT GPU (State VNameSource) (SegBinOp GPU)
forall a b. (a -> b) -> a -> b
$ Commutativity -> Lambda GPU -> [SubExp] -> Shape -> SegBinOp GPU
forall rep.
Commutativity -> Lambda rep -> [SubExp] -> Shape -> SegBinOp rep
SegBinOp Commutativity
comm' Lambda GPU
red_lam'' [SubExp]
nes' Shape
shape
          let map_lam_sequential :: Lambda GPU
map_lam_sequential = Lambda -> Lambda GPU
soacsLambdaToGPU Lambda
map_lam
          SegLevel
lvl <- MkSegLevel GPU (State VNameSource)
forall (m :: * -> *). MonadFreshNames m => MkSegLevel GPU m
segThreadCapped [SubExp
w] String
"segred" (ThreadRecommendation
 -> BuilderT GPU (State VNameSource) (SegOpLevel GPU))
-> ThreadRecommendation
-> BuilderT GPU (State VNameSource) (SegOpLevel GPU)
forall a b. (a -> b) -> a -> b
$ SegVirt -> ThreadRecommendation
NoRecommendation SegVirt
SegNoVirt
          GPUStms -> Builder GPU ()
forall (m :: * -> *). MonadBuilder m => Stms (Rep m) -> m ()
addStms (GPUStms -> Builder GPU ())
-> (GPUStms -> GPUStms) -> GPUStms -> Builder GPU ()
forall b c a. (b -> c) -> (a -> b) -> a -> c
. (Stm GPU -> Stm GPU) -> GPUStms -> GPUStms
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap (Certs -> Stm GPU -> Stm GPU
forall rep. Certs -> Stm rep -> Stm rep
certify Certs
cs)
            (GPUStms -> Builder GPU ())
-> BuilderT GPU (State VNameSource) GPUStms -> Builder GPU ()
forall (m :: * -> *) a b. Monad m => (a -> m b) -> m a -> m b
=<< SegOpLevel GPU
-> Pat GPU
-> SubExp
-> [SegBinOp GPU]
-> Lambda GPU
-> [VName]
-> BuilderT GPU (State VNameSource) GPUStms
forall (m :: * -> *) rep.
(MonadFreshNames m, DistRep rep, HasScope rep m) =>
SegOpLevel rep
-> Pat rep
-> SubExp
-> [SegBinOp rep]
-> Lambda rep
-> [VName]
-> m (Stms rep)
nonSegRed SegOpLevel GPU
SegLevel
lvl Pat SOACS
Pat GPU
pat SubExp
w [SegBinOp GPU]
red_ops Lambda GPU
map_lam_sequential [VName]
arrs

        outerParallelBody :: DistribM (Body GPU)
outerParallelBody =
          Body GPU -> DistribM (Body GPU)
forall rep (m :: * -> *).
(Renameable rep, MonadFreshNames m) =>
Body rep -> m (Body rep)
renameBody
            (Body GPU -> DistribM (Body GPU))
-> DistribM (Body GPU) -> DistribM (Body GPU)
forall (m :: * -> *) a b. Monad m => (a -> m b) -> m a -> m b
=<< (GPUStms -> Result -> Body GPU
forall rep. Buildable rep => Stms rep -> Result -> Body rep
mkBody (GPUStms -> Result -> Body GPU)
-> DistribM GPUStms -> DistribM (Result -> Body GPU)
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> DistribM GPUStms
paralleliseOuter DistribM (Result -> Body GPU)
-> DistribM Result -> DistribM (Body GPU)
forall (f :: * -> *) a b. Applicative f => f (a -> b) -> f a -> f b
<*> Result -> DistribM Result
forall (f :: * -> *) a. Applicative f => a -> f a
pure ([VName] -> Result
varsRes (PatT Type -> [VName]
forall dec. PatT dec -> [VName]
patNames PatT Type
Pat SOACS
pat)))

        paralleliseInner :: KernelPath -> DistribM GPUStms
paralleliseInner KernelPath
path' = do
          (Stm
mapstm, Stm
redstm) <-
            Pat SOACS
-> (SubExp, [Reduce SOACS], Lambda, [VName]) -> DistribM (Stm, Stm)
forall (m :: * -> *) rep.
(MonadFreshNames m, Buildable rep, ExpDec rep ~ (),
 Op rep ~ SOAC rep) =>
Pat rep
-> (SubExp, [Reduce rep], LambdaT rep, [VName])
-> m (Stm rep, Stm rep)
redomapToMapAndReduce Pat SOACS
pat (SubExp
w, [Reduce SOACS]
reds, Lambda
map_lam, [VName]
arrs)
          Scope SOACS
types <- (Scope GPU -> Scope SOACS) -> DistribM (Scope SOACS)
forall rep (m :: * -> *) a.
HasScope rep m =>
(Scope rep -> a) -> m a
asksScope Scope GPU -> Scope SOACS
scopeForSOACs
          KernelPath -> [Stm] -> DistribM GPUStms
transformStms KernelPath
path' ([Stm] -> DistribM GPUStms)
-> (Stms SOACS -> [Stm]) -> Stms SOACS -> DistribM GPUStms
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Stms SOACS -> [Stm]
forall rep. Stms rep -> [Stm rep]
stmsToList (Stms SOACS -> DistribM GPUStms)
-> (BuilderT SOACS DistribM () -> DistribM (Stms SOACS))
-> BuilderT SOACS DistribM ()
-> DistribM GPUStms
forall (m :: * -> *) b c a.
Monad m =>
(b -> m c) -> (a -> m b) -> a -> m c
<=< (BuilderT SOACS DistribM () -> Scope SOACS -> DistribM (Stms SOACS)
forall (m :: * -> *) rep.
MonadFreshNames m =>
BuilderT rep m () -> Scope rep -> m (Stms rep)
`runBuilderT_` Scope SOACS
types) (BuilderT SOACS DistribM () -> DistribM GPUStms)
-> BuilderT SOACS DistribM () -> DistribM GPUStms
forall a b. (a -> b) -> a -> b
$
            Stms SOACS -> BuilderT SOACS DistribM ()
forall (m :: * -> *). MonadBuilder m => Stms (Rep m) -> m ()
addStms (Stms SOACS -> BuilderT SOACS DistribM ())
-> BuilderT SOACS DistribM (Stms SOACS)
-> BuilderT SOACS DistribM ()
forall (m :: * -> *) a b. Monad m => (a -> m b) -> m a -> m b
=<< Stms SOACS -> BuilderT SOACS DistribM (Stms SOACS)
forall (m :: * -> *).
(HasScope SOACS m, MonadFreshNames m) =>
Stms SOACS -> m (Stms SOACS)
simplifyStms ([Stm] -> Stms SOACS
forall rep. [Stm rep] -> Stms rep
stmsFromList [Certs -> Stm -> Stm
forall rep. Certs -> Stm rep -> Stm rep
certify Certs
cs Stm
mapstm, Certs -> Stm -> Stm
forall rep. Certs -> Stm rep -> Stm rep
certify Certs
cs Stm
redstm])

        innerParallelBody :: KernelPath -> DistribM (Body GPU)
innerParallelBody KernelPath
path' =
          Body GPU -> DistribM (Body GPU)
forall rep (m :: * -> *).
(Renameable rep, MonadFreshNames m) =>
Body rep -> m (Body rep)
renameBody
            (Body GPU -> DistribM (Body GPU))
-> DistribM (Body GPU) -> DistribM (Body GPU)
forall (m :: * -> *) a b. Monad m => (a -> m b) -> m a -> m b
=<< (GPUStms -> Result -> Body GPU
forall rep. Buildable rep => Stms rep -> Result -> Body rep
mkBody (GPUStms -> Result -> Body GPU)
-> DistribM GPUStms -> DistribM (Result -> Body GPU)
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> KernelPath -> DistribM GPUStms
paralleliseInner KernelPath
path' DistribM (Result -> Body GPU)
-> DistribM Result -> DistribM (Body GPU)
forall (f :: * -> *) a b. Applicative f => f (a -> b) -> f a -> f b
<*> Result -> DistribM Result
forall (f :: * -> *) a. Applicative f => a -> f a
pure ([VName] -> Result
varsRes (PatT Type -> [VName]
forall dec. PatT dec -> [VName]
patNames PatT Type
Pat SOACS
pat)))

    if Bool -> Bool
not (Lambda -> Bool
lambdaContainsParallelism Lambda
map_lam)
      Bool -> Bool -> Bool
|| Attr
"sequential_inner" Attr -> Attrs -> Bool
`inAttrs` StmAux () -> Attrs
forall dec. StmAux dec -> Attrs
stmAuxAttrs StmAux ()
StmAux (ExpDec SOACS)
aux
      then DistribM GPUStms
paralleliseOuter
      else do
        ((SubExp
outer_suff, Name
outer_suff_key), GPUStms
suff_stms) <-
          String
-> [SubExp]
-> KernelPath
-> Maybe Int64
-> DistribM ((SubExp, Name), GPUStms)
sufficientParallelism String
"suff_outer_redomap" [SubExp
w] KernelPath
path Maybe Int64
forall a. Maybe a
Nothing

        Body GPU
outer_stms <- DistribM (Body GPU)
outerParallelBody
        Body GPU
inner_stms <- KernelPath -> DistribM (Body GPU)
innerParallelBody ((Name
outer_suff_key, Bool
False) (Name, Bool) -> KernelPath -> KernelPath
forall a. a -> [a] -> [a]
: KernelPath
path)

        (GPUStms
suff_stms GPUStms -> GPUStms -> GPUStms
forall a. Semigroup a => a -> a -> a
<>) (GPUStms -> GPUStms) -> DistribM GPUStms -> DistribM GPUStms
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> Pat GPU -> Body GPU -> [(SubExp, Body GPU)] -> DistribM GPUStms
forall (m :: * -> *).
(MonadFreshNames m, HasScope GPU m) =>
Pat GPU -> Body GPU -> [(SubExp, Body GPU)] -> m GPUStms
kernelAlternatives Pat SOACS
Pat GPU
pat Body GPU
inner_stms [(SubExp
outer_suff, Body GPU
outer_stms)]

-- Streams can be handled in two different ways - either we
-- sequentialise the body or we keep it parallel and distribute.
transformStm KernelPath
path (Let Pat SOACS
pat aux :: StmAux (ExpDec SOACS)
aux@(StmAux Certs
cs Attrs
_ ExpDec SOACS
_) (Op (Stream w arrs Parallel {} [] map_fun)))
  | Bool -> Bool
not (Attr
"sequential_inner" Attr -> Attrs -> Bool
`inAttrs` StmAux () -> Attrs
forall dec. StmAux dec -> Attrs
stmAuxAttrs StmAux ()
StmAux (ExpDec SOACS)
aux) = do
    -- No reduction part.  Remove the stream and leave the body
    -- parallel.  It will be distributed.
    Scope SOACS
types <- (Scope GPU -> Scope SOACS) -> DistribM (Scope SOACS)
forall rep (m :: * -> *) a.
HasScope rep m =>
(Scope rep -> a) -> m a
asksScope Scope GPU -> Scope SOACS
scopeForSOACs
    KernelPath -> [Stm] -> DistribM GPUStms
transformStms KernelPath
path ([Stm] -> DistribM GPUStms)
-> (((), Stms SOACS) -> [Stm])
-> ((), Stms SOACS)
-> DistribM GPUStms
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Stms SOACS -> [Stm]
forall rep. Stms rep -> [Stm rep]
stmsToList (Stms SOACS -> [Stm])
-> (((), Stms SOACS) -> Stms SOACS) -> ((), Stms SOACS) -> [Stm]
forall b c a. (b -> c) -> (a -> b) -> a -> c
. ((), Stms SOACS) -> Stms SOACS
forall a b. (a, b) -> b
snd
      (((), Stms SOACS) -> DistribM GPUStms)
-> DistribM ((), Stms SOACS) -> DistribM GPUStms
forall (m :: * -> *) a b. Monad m => (a -> m b) -> m a -> m b
=<< BuilderT SOACS DistribM ()
-> Scope SOACS -> DistribM ((), Stms SOACS)
forall (m :: * -> *) rep a.
MonadFreshNames m =>
BuilderT rep m a -> Scope rep -> m (a, Stms rep)
runBuilderT (Certs -> BuilderT SOACS DistribM () -> BuilderT SOACS DistribM ()
forall (m :: * -> *) a. MonadBuilder m => Certs -> m a -> m a
certifying Certs
cs (BuilderT SOACS DistribM () -> BuilderT SOACS DistribM ())
-> BuilderT SOACS DistribM () -> BuilderT SOACS DistribM ()
forall a b. (a -> b) -> a -> b
$ Pat (Rep (BuilderT SOACS DistribM))
-> SubExp
-> [SubExp]
-> LambdaT (Rep (BuilderT SOACS DistribM))
-> [VName]
-> BuilderT SOACS DistribM ()
forall (m :: * -> *).
(MonadBuilder m, Buildable (Rep m)) =>
Pat (Rep m)
-> SubExp -> [SubExp] -> LambdaT (Rep m) -> [VName] -> m ()
sequentialStreamWholeArray Pat (Rep (BuilderT SOACS DistribM))
Pat SOACS
pat SubExp
w [] LambdaT (Rep (BuilderT SOACS DistribM))
Lambda
map_fun [VName]
arrs) Scope SOACS
types
transformStm KernelPath
path (Let Pat SOACS
pat aux :: StmAux (ExpDec SOACS)
aux@(StmAux Certs
cs Attrs
_ ExpDec SOACS
_) (Op (Stream w arrs (Parallel o comm red_fun) nes fold_fun)))
  | Attr
"sequential_inner" Attr -> Attrs -> Bool
`inAttrs` StmAux () -> Attrs
forall dec. StmAux dec -> Attrs
stmAuxAttrs StmAux ()
StmAux (ExpDec SOACS)
aux =
    KernelPath -> DistribM GPUStms
paralleliseOuter KernelPath
path
  | Bool
otherwise = do
    ((SubExp
outer_suff, Name
outer_suff_key), GPUStms
suff_stms) <-
      String
-> [SubExp]
-> KernelPath
-> Maybe Int64
-> DistribM ((SubExp, Name), GPUStms)
sufficientParallelism String
"suff_outer_stream" [SubExp
w] KernelPath
path Maybe Int64
forall a. Maybe a
Nothing

    Body GPU
outer_stms <- KernelPath -> DistribM (Body GPU)
outerParallelBody ((Name
outer_suff_key, Bool
True) (Name, Bool) -> KernelPath -> KernelPath
forall a. a -> [a] -> [a]
: KernelPath
path)
    Body GPU
inner_stms <- KernelPath -> DistribM (Body GPU)
innerParallelBody ((Name
outer_suff_key, Bool
False) (Name, Bool) -> KernelPath -> KernelPath
forall a. a -> [a] -> [a]
: KernelPath
path)

    (GPUStms
suff_stms GPUStms -> GPUStms -> GPUStms
forall a. Semigroup a => a -> a -> a
<>)
      (GPUStms -> GPUStms) -> DistribM GPUStms -> DistribM GPUStms
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> Pat GPU -> Body GPU -> [(SubExp, Body GPU)] -> DistribM GPUStms
forall (m :: * -> *).
(MonadFreshNames m, HasScope GPU m) =>
Pat GPU -> Body GPU -> [(SubExp, Body GPU)] -> m GPUStms
kernelAlternatives Pat SOACS
Pat GPU
pat Body GPU
inner_stms [(SubExp
outer_suff, Body GPU
outer_stms)]
  where
    paralleliseOuter :: KernelPath -> DistribM GPUStms
paralleliseOuter KernelPath
path'
      | Bool -> Bool
not (Bool -> Bool) -> Bool -> Bool
forall a b. (a -> b) -> a -> b
$ (Type -> Bool) -> [Type] -> Bool
forall (t :: * -> *) a. Foldable t => (a -> Bool) -> t a -> Bool
all Type -> Bool
forall shape u. TypeBase shape u -> Bool
primType ([Type] -> Bool) -> [Type] -> Bool
forall a b. (a -> b) -> a -> b
$ Lambda -> [Type]
forall rep. LambdaT rep -> [Type]
lambdaReturnType Lambda
red_fun = do
        -- Split into a chunked map and a reduction, with the latter
        -- further transformed.
        let fold_fun' :: Lambda GPU
fold_fun' = Lambda -> Lambda GPU
soacsLambdaToGPU Lambda
fold_fun

        let ([PatElemT Type]
red_pat_elems, [PatElemT Type]
concat_pat_elems) =
              Int -> [PatElemT Type] -> ([PatElemT Type], [PatElemT Type])
forall a. Int -> [a] -> ([a], [a])
splitAt ([SubExp] -> Int
forall (t :: * -> *) a. Foldable t => t a -> Int
length [SubExp]
nes) ([PatElemT Type] -> ([PatElemT Type], [PatElemT Type]))
-> [PatElemT Type] -> ([PatElemT Type], [PatElemT Type])
forall a b. (a -> b) -> a -> b
$ PatT Type -> [PatElemT Type]
forall dec. PatT dec -> [PatElemT dec]
patElems PatT Type
Pat SOACS
pat
            red_pat :: PatT Type
red_pat = [PatElemT Type] -> PatT Type
forall dec. [PatElemT dec] -> PatT dec
Pat [PatElemT Type]
red_pat_elems

        ((SubExp
num_threads, [VName]
red_results), GPUStms
stms) <-
          MkSegLevel GPU DistribM
-> [String]
-> [PatElem GPU]
-> SubExp
-> Commutativity
-> Lambda GPU
-> [SubExp]
-> [VName]
-> DistribM ((SubExp, [VName]), GPUStms)
forall (m :: * -> *).
(MonadFreshNames m, HasScope GPU m) =>
MkSegLevel GPU m
-> [String]
-> [PatElem GPU]
-> SubExp
-> Commutativity
-> Lambda GPU
-> [SubExp]
-> [VName]
-> m ((SubExp, [VName]), GPUStms)
streamMap
            MkSegLevel GPU DistribM
forall (m :: * -> *). MonadFreshNames m => MkSegLevel GPU m
segThreadCapped
            ((PatElemT Type -> String) -> [PatElemT Type] -> [String]
forall a b. (a -> b) -> [a] -> [b]
map (VName -> String
baseString (VName -> String)
-> (PatElemT Type -> VName) -> PatElemT Type -> String
forall b c a. (b -> c) -> (a -> b) -> a -> c
. PatElemT Type -> VName
forall dec. PatElemT dec -> VName
patElemName) [PatElemT Type]
red_pat_elems)
            [PatElemT Type]
[PatElem GPU]
concat_pat_elems
            SubExp
w
            Commutativity
Noncommutative
            Lambda GPU
fold_fun'
            [SubExp]
nes
            [VName]
arrs

        ScremaForm SOACS
reduce_soac <- [Reduce SOACS] -> DistribM (ScremaForm SOACS)
forall rep (m :: * -> *).
(Buildable rep, MonadFreshNames m) =>
[Reduce rep] -> m (ScremaForm rep)
reduceSOAC [Commutativity -> Lambda -> [SubExp] -> Reduce SOACS
forall rep. Commutativity -> Lambda rep -> [SubExp] -> Reduce rep
Reduce Commutativity
comm' Lambda
red_fun [SubExp]
nes]

        (GPUStms
stms GPUStms -> GPUStms -> GPUStms
forall a. Semigroup a => a -> a -> a
<>)
          (GPUStms -> GPUStms) -> DistribM GPUStms -> DistribM GPUStms
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> GPUStms -> DistribM GPUStms -> DistribM GPUStms
forall rep a (m :: * -> *) b.
(Scoped rep a, LocalScope rep m) =>
a -> m b -> m b
inScopeOf
            GPUStms
stms
            ( KernelPath -> Stm -> DistribM GPUStms
transformStm KernelPath
path' (Stm -> DistribM GPUStms) -> Stm -> DistribM GPUStms
forall a b. (a -> b) -> a -> b
$
                Pat SOACS -> StmAux (ExpDec SOACS) -> ExpT SOACS -> Stm
forall rep. Pat rep -> StmAux (ExpDec rep) -> Exp rep -> Stm rep
Let PatT Type
Pat SOACS
red_pat StmAux ()
StmAux (ExpDec SOACS)
aux {stmAuxAttrs :: Attrs
stmAuxAttrs = Attrs
forall a. Monoid a => a
mempty} (ExpT SOACS -> Stm) -> ExpT SOACS -> Stm
forall a b. (a -> b) -> a -> b
$
                  Op SOACS -> ExpT SOACS
forall rep. Op rep -> ExpT rep
Op (SubExp -> [VName] -> ScremaForm SOACS -> SOAC SOACS
forall rep. SubExp -> [VName] -> ScremaForm rep -> SOAC rep
Screma SubExp
num_threads [VName]
red_results ScremaForm SOACS
reduce_soac)
            )
      | Bool
otherwise = do
        let red_fun_sequential :: Lambda GPU
red_fun_sequential = Lambda -> Lambda GPU
soacsLambdaToGPU Lambda
red_fun
            fold_fun_sequential :: Lambda GPU
fold_fun_sequential = Lambda -> Lambda GPU
soacsLambdaToGPU Lambda
fold_fun
        (Stm GPU -> Stm GPU) -> GPUStms -> GPUStms
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap (Certs -> Stm GPU -> Stm GPU
forall rep. Certs -> Stm rep -> Stm rep
certify Certs
cs)
          (GPUStms -> GPUStms) -> DistribM GPUStms -> DistribM GPUStms
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> MkSegLevel GPU DistribM
-> Pat GPU
-> SubExp
-> Commutativity
-> Lambda GPU
-> Lambda GPU
-> [SubExp]
-> [VName]
-> DistribM GPUStms
forall (m :: * -> *).
(MonadFreshNames m, HasScope GPU m) =>
MkSegLevel GPU m
-> Pat GPU
-> SubExp
-> Commutativity
-> Lambda GPU
-> Lambda GPU
-> [SubExp]
-> [VName]
-> m GPUStms
streamRed
            MkSegLevel GPU DistribM
forall (m :: * -> *). MonadFreshNames m => MkSegLevel GPU m
segThreadCapped
            Pat SOACS
Pat GPU
pat
            SubExp
w
            Commutativity
comm'
            Lambda GPU
red_fun_sequential
            Lambda GPU
fold_fun_sequential
            [SubExp]
nes
            [VName]
arrs

    outerParallelBody :: KernelPath -> DistribM (Body GPU)
outerParallelBody KernelPath
path' =
      Body GPU -> DistribM (Body GPU)
forall rep (m :: * -> *).
(Renameable rep, MonadFreshNames m) =>
Body rep -> m (Body rep)
renameBody
        (Body GPU -> DistribM (Body GPU))
-> DistribM (Body GPU) -> DistribM (Body GPU)
forall (m :: * -> *) a b. Monad m => (a -> m b) -> m a -> m b
=<< (GPUStms -> Result -> Body GPU
forall rep. Buildable rep => Stms rep -> Result -> Body rep
mkBody (GPUStms -> Result -> Body GPU)
-> DistribM GPUStms -> DistribM (Result -> Body GPU)
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> KernelPath -> DistribM GPUStms
paralleliseOuter KernelPath
path' DistribM (Result -> Body GPU)
-> DistribM Result -> DistribM (Body GPU)
forall (f :: * -> *) a b. Applicative f => f (a -> b) -> f a -> f b
<*> Result -> DistribM Result
forall (f :: * -> *) a. Applicative f => a -> f a
pure ([VName] -> Result
varsRes (PatT Type -> [VName]
forall dec. PatT dec -> [VName]
patNames PatT Type
Pat SOACS
pat)))

    paralleliseInner :: KernelPath -> DistribM GPUStms
paralleliseInner KernelPath
path' = do
      Scope SOACS
types <- (Scope GPU -> Scope SOACS) -> DistribM (Scope SOACS)
forall rep (m :: * -> *) a.
HasScope rep m =>
(Scope rep -> a) -> m a
asksScope Scope GPU -> Scope SOACS
scopeForSOACs
      KernelPath -> [Stm] -> DistribM GPUStms
transformStms KernelPath
path' ([Stm] -> DistribM GPUStms)
-> (((), Stms SOACS) -> [Stm])
-> ((), Stms SOACS)
-> DistribM GPUStms
forall b c a. (b -> c) -> (a -> b) -> a -> c
. (Stm -> Stm) -> [Stm] -> [Stm]
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap (Certs -> Stm -> Stm
forall rep. Certs -> Stm rep -> Stm rep
certify Certs
cs) ([Stm] -> [Stm])
-> (((), Stms SOACS) -> [Stm]) -> ((), Stms SOACS) -> [Stm]
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Stms SOACS -> [Stm]
forall rep. Stms rep -> [Stm rep]
stmsToList (Stms SOACS -> [Stm])
-> (((), Stms SOACS) -> Stms SOACS) -> ((), Stms SOACS) -> [Stm]
forall b c a. (b -> c) -> (a -> b) -> a -> c
. ((), Stms SOACS) -> Stms SOACS
forall a b. (a, b) -> b
snd
        (((), Stms SOACS) -> DistribM GPUStms)
-> DistribM ((), Stms SOACS) -> DistribM GPUStms
forall (m :: * -> *) a b. Monad m => (a -> m b) -> m a -> m b
=<< BuilderT SOACS DistribM ()
-> Scope SOACS -> DistribM ((), Stms SOACS)
forall (m :: * -> *) rep a.
MonadFreshNames m =>
BuilderT rep m a -> Scope rep -> m (a, Stms rep)
runBuilderT (Pat (Rep (BuilderT SOACS DistribM))
-> SubExp
-> [SubExp]
-> LambdaT (Rep (BuilderT SOACS DistribM))
-> [VName]
-> BuilderT SOACS DistribM ()
forall (m :: * -> *).
(MonadBuilder m, Buildable (Rep m)) =>
Pat (Rep m)
-> SubExp -> [SubExp] -> LambdaT (Rep m) -> [VName] -> m ()
sequentialStreamWholeArray Pat (Rep (BuilderT SOACS DistribM))
Pat SOACS
pat SubExp
w [SubExp]
nes LambdaT (Rep (BuilderT SOACS DistribM))
Lambda
fold_fun [VName]
arrs) Scope SOACS
types

    innerParallelBody :: KernelPath -> DistribM (Body GPU)
innerParallelBody KernelPath
path' =
      Body GPU -> DistribM (Body GPU)
forall rep (m :: * -> *).
(Renameable rep, MonadFreshNames m) =>
Body rep -> m (Body rep)
renameBody
        (Body GPU -> DistribM (Body GPU))
-> DistribM (Body GPU) -> DistribM (Body GPU)
forall (m :: * -> *) a b. Monad m => (a -> m b) -> m a -> m b
=<< (GPUStms -> Result -> Body GPU
forall rep. Buildable rep => Stms rep -> Result -> Body rep
mkBody (GPUStms -> Result -> Body GPU)
-> DistribM GPUStms -> DistribM (Result -> Body GPU)
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> KernelPath -> DistribM GPUStms
paralleliseInner KernelPath
path' DistribM (Result -> Body GPU)
-> DistribM Result -> DistribM (Body GPU)
forall (f :: * -> *) a b. Applicative f => f (a -> b) -> f a -> f b
<*> Result -> DistribM Result
forall (f :: * -> *) a. Applicative f => a -> f a
pure ([VName] -> Result
varsRes (PatT Type -> [VName]
forall dec. PatT dec -> [VName]
patNames PatT Type
Pat SOACS
pat)))

    comm' :: Commutativity
comm'
      | Lambda -> Bool
forall rep. Lambda rep -> Bool
commutativeLambda Lambda
red_fun, StreamOrd
o StreamOrd -> StreamOrd -> Bool
forall a. Eq a => a -> a -> Bool
/= StreamOrd
InOrder = Commutativity
Commutative
      | Bool
otherwise = Commutativity
comm
transformStm KernelPath
path (Let Pat SOACS
pat (StmAux Certs
cs Attrs
_ ExpDec SOACS
_) (Op (Screma w arrs form))) = do
  -- This screma is too complicated for us to immediately do
  -- anything, so split it up and try again.
  Scope SOACS
scope <- (Scope GPU -> Scope SOACS) -> DistribM (Scope SOACS)
forall rep (m :: * -> *) a.
HasScope rep m =>
(Scope rep -> a) -> m a
asksScope Scope GPU -> Scope SOACS
scopeForSOACs
  KernelPath -> [Stm] -> DistribM GPUStms
transformStms KernelPath
path ([Stm] -> DistribM GPUStms)
-> (((), Stms SOACS) -> [Stm])
-> ((), Stms SOACS)
-> DistribM GPUStms
forall b c a. (b -> c) -> (a -> b) -> a -> c
. (Stm -> Stm) -> [Stm] -> [Stm]
forall a b. (a -> b) -> [a] -> [b]
map (Certs -> Stm -> Stm
forall rep. Certs -> Stm rep -> Stm rep
certify Certs
cs) ([Stm] -> [Stm])
-> (((), Stms SOACS) -> [Stm]) -> ((), Stms SOACS) -> [Stm]
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Stms SOACS -> [Stm]
forall rep. Stms rep -> [Stm rep]
stmsToList (Stms SOACS -> [Stm])
-> (((), Stms SOACS) -> Stms SOACS) -> ((), Stms SOACS) -> [Stm]
forall b c a. (b -> c) -> (a -> b) -> a -> c
. ((), Stms SOACS) -> Stms SOACS
forall a b. (a, b) -> b
snd
    (((), Stms SOACS) -> DistribM GPUStms)
-> DistribM ((), Stms SOACS) -> DistribM GPUStms
forall (m :: * -> *) a b. Monad m => (a -> m b) -> m a -> m b
=<< BuilderT SOACS DistribM ()
-> Scope SOACS -> DistribM ((), Stms SOACS)
forall (m :: * -> *) rep a.
MonadFreshNames m =>
BuilderT rep m a -> Scope rep -> m (a, Stms rep)
runBuilderT (Pat (Rep (BuilderT SOACS DistribM))
-> SubExp
-> ScremaForm (Rep (BuilderT SOACS DistribM))
-> [VName]
-> BuilderT SOACS DistribM ()
forall (m :: * -> *).
(MonadBuilder m, Op (Rep m) ~ SOAC (Rep m), Buildable (Rep m)) =>
Pat (Rep m) -> SubExp -> ScremaForm (Rep m) -> [VName] -> m ()
dissectScrema Pat (Rep (BuilderT SOACS DistribM))
Pat SOACS
pat SubExp
w ScremaForm (Rep (BuilderT SOACS DistribM))
ScremaForm SOACS
form [VName]
arrs) Scope SOACS
scope
transformStm KernelPath
path (Let Pat SOACS
pat StmAux (ExpDec SOACS)
_ (Op (Stream w arrs Sequential nes fold_fun))) = do
  -- Remove the stream and leave the body parallel.  It will be
  -- distributed.
  Scope SOACS
types <- (Scope GPU -> Scope SOACS) -> DistribM (Scope SOACS)
forall rep (m :: * -> *) a.
HasScope rep m =>
(Scope rep -> a) -> m a
asksScope Scope GPU -> Scope SOACS
scopeForSOACs
  KernelPath -> [Stm] -> DistribM GPUStms
transformStms KernelPath
path ([Stm] -> DistribM GPUStms)
-> (((), Stms SOACS) -> [Stm])
-> ((), Stms SOACS)
-> DistribM GPUStms
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Stms SOACS -> [Stm]
forall rep. Stms rep -> [Stm rep]
stmsToList (Stms SOACS -> [Stm])
-> (((), Stms SOACS) -> Stms SOACS) -> ((), Stms SOACS) -> [Stm]
forall b c a. (b -> c) -> (a -> b) -> a -> c
. ((), Stms SOACS) -> Stms SOACS
forall a b. (a, b) -> b
snd
    (((), Stms SOACS) -> DistribM GPUStms)
-> DistribM ((), Stms SOACS) -> DistribM GPUStms
forall (m :: * -> *) a b. Monad m => (a -> m b) -> m a -> m b
=<< BuilderT SOACS DistribM ()
-> Scope SOACS -> DistribM ((), Stms SOACS)
forall (m :: * -> *) rep a.
MonadFreshNames m =>
BuilderT rep m a -> Scope rep -> m (a, Stms rep)
runBuilderT (Pat (Rep (BuilderT SOACS DistribM))
-> SubExp
-> [SubExp]
-> LambdaT (Rep (BuilderT SOACS DistribM))
-> [VName]
-> BuilderT SOACS DistribM ()
forall (m :: * -> *).
(MonadBuilder m, Buildable (Rep m)) =>
Pat (Rep m)
-> SubExp -> [SubExp] -> LambdaT (Rep m) -> [VName] -> m ()
sequentialStreamWholeArray Pat (Rep (BuilderT SOACS DistribM))
Pat SOACS
pat SubExp
w [SubExp]
nes LambdaT (Rep (BuilderT SOACS DistribM))
Lambda
fold_fun [VName]
arrs) Scope SOACS
types
transformStm KernelPath
_ (Let Pat SOACS
pat (StmAux Certs
cs Attrs
_ ExpDec SOACS
_) (Op (Scatter w ivs lam as))) = Builder GPU () -> DistribM GPUStms
forall (m :: * -> *) somerep rep a.
(MonadFreshNames m, HasScope somerep m, SameScope somerep rep) =>
Builder rep a -> m (Stms rep)
runBuilder_ (Builder GPU () -> DistribM GPUStms)
-> Builder GPU () -> DistribM GPUStms
forall a b. (a -> b) -> a -> b
$ do
  let lam' :: Lambda GPU
lam' = Lambda -> Lambda GPU
soacsLambdaToGPU Lambda
lam
  VName
write_i <- String -> BuilderT GPU (State VNameSource) VName
forall (m :: * -> *). MonadFreshNames m => String -> m VName
newVName String
"write_i"
  let ([Shape]
as_ws, [Int]
_, [VName]
_) = [(Shape, Int, VName)] -> ([Shape], [Int], [VName])
forall a b c. [(a, b, c)] -> ([a], [b], [c])
unzip3 [(Shape, Int, VName)]
as
      kstms :: GPUStms
kstms = Body GPU -> GPUStms
forall rep. BodyT rep -> Stms rep
bodyStms (Body GPU -> GPUStms) -> Body GPU -> GPUStms
forall a b. (a -> b) -> a -> b
$ Lambda GPU -> Body GPU
forall rep. LambdaT rep -> BodyT rep
lambdaBody Lambda GPU
lam'
      krets :: [KernelResult]
krets = do
        (Shape
a_w, VName
a, [(Result, SubExpRes)]
is_vs) <- [(Shape, Int, VName)]
-> Result -> [(Shape, VName, [(Result, SubExpRes)])]
forall array a.
[(Shape, Int, array)] -> [a] -> [(Shape, array, [([a], a)])]
groupScatterResults [(Shape, Int, VName)]
as (Result -> [(Shape, VName, [(Result, SubExpRes)])])
-> Result -> [(Shape, VName, [(Result, SubExpRes)])]
forall a b. (a -> b) -> a -> b
$ Body GPU -> Result
forall rep. BodyT rep -> Result
bodyResult (Body GPU -> Result) -> Body GPU -> Result
forall a b. (a -> b) -> a -> b
$ Lambda GPU -> Body GPU
forall rep. LambdaT rep -> BodyT rep
lambdaBody Lambda GPU
lam'
        let res_cs :: Certs
res_cs =
              ((Result, SubExpRes) -> Certs) -> [(Result, SubExpRes)] -> Certs
forall (t :: * -> *) m a.
(Foldable t, Monoid m) =>
(a -> m) -> t a -> m
foldMap ((SubExpRes -> Certs) -> Result -> Certs
forall (t :: * -> *) m a.
(Foldable t, Monoid m) =>
(a -> m) -> t a -> m
foldMap SubExpRes -> Certs
resCerts (Result -> Certs)
-> ((Result, SubExpRes) -> Result) -> (Result, SubExpRes) -> Certs
forall b c a. (b -> c) -> (a -> b) -> a -> c
. (Result, SubExpRes) -> Result
forall a b. (a, b) -> a
fst) [(Result, SubExpRes)]
is_vs
                Certs -> Certs -> Certs
forall a. Semigroup a => a -> a -> a
<> ((Result, SubExpRes) -> Certs) -> [(Result, SubExpRes)] -> Certs
forall (t :: * -> *) m a.
(Foldable t, Monoid m) =>
(a -> m) -> t a -> m
foldMap (SubExpRes -> Certs
resCerts (SubExpRes -> Certs)
-> ((Result, SubExpRes) -> SubExpRes)
-> (Result, SubExpRes)
-> Certs
forall b c a. (b -> c) -> (a -> b) -> a -> c
. (Result, SubExpRes) -> SubExpRes
forall a b. (a, b) -> b
snd) [(Result, SubExpRes)]
is_vs
            is_vs' :: [(Slice SubExp, SubExp)]
is_vs' = [([DimIndex SubExp] -> Slice SubExp
forall d. [DimIndex d] -> Slice d
Slice ([DimIndex SubExp] -> Slice SubExp)
-> [DimIndex SubExp] -> Slice SubExp
forall a b. (a -> b) -> a -> b
$ (SubExpRes -> DimIndex SubExp) -> Result -> [DimIndex SubExp]
forall a b. (a -> b) -> [a] -> [b]
map (SubExp -> DimIndex SubExp
forall d. d -> DimIndex d
DimFix (SubExp -> DimIndex SubExp)
-> (SubExpRes -> SubExp) -> SubExpRes -> DimIndex SubExp
forall b c a. (b -> c) -> (a -> b) -> a -> c
. SubExpRes -> SubExp
resSubExp) Result
is, SubExpRes -> SubExp
resSubExp SubExpRes
v) | (Result
is, SubExpRes
v) <- [(Result, SubExpRes)]
is_vs]
        KernelResult -> [KernelResult]
forall (m :: * -> *) a. Monad m => a -> m a
return (KernelResult -> [KernelResult]) -> KernelResult -> [KernelResult]
forall a b. (a -> b) -> a -> b
$ Certs -> Shape -> VName -> [(Slice SubExp, SubExp)] -> KernelResult
WriteReturns Certs
res_cs Shape
a_w VName
a [(Slice SubExp, SubExp)]
is_vs'
      body :: KernelBody GPU
body = BodyDec GPU -> GPUStms -> [KernelResult] -> KernelBody GPU
forall rep.
BodyDec rep -> Stms rep -> [KernelResult] -> KernelBody rep
KernelBody () GPUStms
kstms [KernelResult]
krets
      inputs :: [KernelInput]
inputs = do
        (Param Type
p, VName
p_a) <- [Param Type] -> [VName] -> [(Param Type, VName)]
forall a b. [a] -> [b] -> [(a, b)]
zip (Lambda GPU -> [LParam GPU]
forall rep. LambdaT rep -> [LParam rep]
lambdaParams Lambda GPU
lam') [VName]
ivs
        KernelInput -> [KernelInput]
forall (m :: * -> *) a. Monad m => a -> m a
return (KernelInput -> [KernelInput]) -> KernelInput -> [KernelInput]
forall a b. (a -> b) -> a -> b
$ VName -> Type -> VName -> [SubExp] -> KernelInput
KernelInput (Param Type -> VName
forall dec. Param dec -> VName
paramName Param Type
p) (Param Type -> Type
forall dec. Typed dec => Param dec -> Type
paramType Param Type
p) VName
p_a [VName -> SubExp
Var VName
write_i]
  (SegOp SegLevel GPU
kernel, GPUStms
stms) <-
    MkSegLevel GPU (BuilderT GPU (State VNameSource))
-> [(VName, SubExp)]
-> [KernelInput]
-> [Type]
-> KernelBody GPU
-> BuilderT
     GPU (State VNameSource) (SegOp (SegOpLevel GPU) GPU, GPUStms)
forall rep (m :: * -> *).
(DistRep rep, HasScope rep m, MonadFreshNames m) =>
MkSegLevel rep m
-> [(VName, SubExp)]
-> [KernelInput]
-> [Type]
-> KernelBody rep
-> m (SegOp (SegOpLevel rep) rep, Stms rep)
mapKernel
      MkSegLevel GPU (BuilderT GPU (State VNameSource))
forall (m :: * -> *). MonadFreshNames m => MkSegLevel GPU m
segThreadCapped
      [(VName
write_i, SubExp
w)]
      [KernelInput]
inputs
      ((Shape -> Type -> Type) -> [Shape] -> [Type] -> [Type]
forall a b c. (a -> b -> c) -> [a] -> [b] -> [c]
zipWith (Int -> Type -> Type
forall shape u.
ArrayShape shape =>
Int -> TypeBase shape u -> TypeBase shape u
stripArray (Int -> Type -> Type) -> (Shape -> Int) -> Shape -> Type -> Type
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Shape -> Int
forall (t :: * -> *) a. Foldable t => t a -> Int
length) [Shape]
as_ws ([Type] -> [Type]) -> [Type] -> [Type]
forall a b. (a -> b) -> a -> b
$ PatT Type -> [Type]
forall dec. Typed dec => PatT dec -> [Type]
patTypes PatT Type
Pat SOACS
pat)
      KernelBody GPU
body
  Certs -> Builder GPU () -> Builder GPU ()
forall (m :: * -> *) a. MonadBuilder m => Certs -> m a -> m a
certifying Certs
cs (Builder GPU () -> Builder GPU ())
-> Builder GPU () -> Builder GPU ()
forall a b. (a -> b) -> a -> b
$ do
    Stms (Rep (BuilderT GPU (State VNameSource))) -> Builder GPU ()
forall (m :: * -> *). MonadBuilder m => Stms (Rep m) -> m ()
addStms Stms (Rep (BuilderT GPU (State VNameSource)))
GPUStms
stms
    Pat (Rep (BuilderT GPU (State VNameSource)))
-> Exp (Rep (BuilderT GPU (State VNameSource))) -> Builder GPU ()
forall (m :: * -> *).
MonadBuilder m =>
Pat (Rep m) -> Exp (Rep m) -> m ()
letBind Pat (Rep (BuilderT GPU (State VNameSource)))
Pat SOACS
pat (Exp (Rep (BuilderT GPU (State VNameSource))) -> Builder GPU ())
-> Exp (Rep (BuilderT GPU (State VNameSource))) -> Builder GPU ()
forall a b. (a -> b) -> a -> b
$ Op GPU -> ExpT GPU
forall rep. Op rep -> ExpT rep
Op (Op GPU -> ExpT GPU) -> Op GPU -> ExpT GPU
forall a b. (a -> b) -> a -> b
$ SegOp SegLevel GPU -> HostOp GPU (SOAC GPU)
forall rep op. SegOp SegLevel rep -> HostOp rep op
SegOp SegOp SegLevel GPU
kernel
transformStm KernelPath
_ (Let Pat SOACS
orig_pat (StmAux Certs
cs Attrs
_ ExpDec SOACS
_) (Op (Hist w imgs ops bucket_fun))) = do
  let bfun' :: Lambda GPU
bfun' = Lambda -> Lambda GPU
soacsLambdaToGPU Lambda
bucket_fun

  -- It is important not to launch unnecessarily many threads for
  -- histograms, because it may mean we unnecessarily need to reduce
  -- subhistograms as well.
  Builder GPU () -> DistribM GPUStms
forall (m :: * -> *) somerep rep a.
(MonadFreshNames m, HasScope somerep m, SameScope somerep rep) =>
Builder rep a -> m (Stms rep)
runBuilder_ (Builder GPU () -> DistribM GPUStms)
-> Builder GPU () -> DistribM GPUStms
forall a b. (a -> b) -> a -> b
$ do
    SegLevel
lvl <- MkSegLevel GPU (State VNameSource)
forall (m :: * -> *). MonadFreshNames m => MkSegLevel GPU m
segThreadCapped [SubExp
w] String
"seghist" (ThreadRecommendation
 -> BuilderT GPU (State VNameSource) (SegOpLevel GPU))
-> ThreadRecommendation
-> BuilderT GPU (State VNameSource) (SegOpLevel GPU)
forall a b. (a -> b) -> a -> b
$ SegVirt -> ThreadRecommendation
NoRecommendation SegVirt
SegNoVirt
    GPUStms -> Builder GPU ()
forall (m :: * -> *). MonadBuilder m => Stms (Rep m) -> m ()
addStms (GPUStms -> Builder GPU ())
-> BuilderT GPU (State VNameSource) GPUStms -> Builder GPU ()
forall (m :: * -> *) a b. Monad m => (a -> m b) -> m a -> m b
=<< (Lambda
 -> BuilderT
      GPU
      (State VNameSource)
      (Lambda (Rep (BuilderT GPU (State VNameSource)))))
-> SegOpLevel (Rep (BuilderT GPU (State VNameSource)))
-> PatT Type
-> [(VName, SubExp)]
-> [KernelInput]
-> Certs
-> SubExp
-> [HistOp SOACS]
-> Lambda (Rep (BuilderT GPU (State VNameSource)))
-> [VName]
-> BuilderT
     GPU
     (State VNameSource)
     (Stms (Rep (BuilderT GPU (State VNameSource))))
forall (m :: * -> *).
(MonadBuilder m, DistRep (Rep m)) =>
(Lambda -> m (Lambda (Rep m)))
-> SegOpLevel (Rep m)
-> PatT Type
-> [(VName, SubExp)]
-> [KernelInput]
-> Certs
-> SubExp
-> [HistOp SOACS]
-> Lambda (Rep m)
-> [VName]
-> m (Stms (Rep m))
histKernel Lambda
-> BuilderT
     GPU
     (State VNameSource)
     (Lambda (Rep (BuilderT GPU (State VNameSource))))
Lambda -> BuilderT GPU (State VNameSource) (Lambda GPU)
onLambda SegOpLevel (Rep (BuilderT GPU (State VNameSource)))
SegLevel
lvl PatT Type
Pat SOACS
orig_pat [] [] Certs
cs SubExp
w [HistOp SOACS]
ops Lambda (Rep (BuilderT GPU (State VNameSource)))
Lambda GPU
bfun' [VName]
imgs
  where
    onLambda :: Lambda -> BuilderT GPU (State VNameSource) (Lambda GPU)
onLambda = Lambda GPU -> BuilderT GPU (State VNameSource) (Lambda GPU)
forall (f :: * -> *) a. Applicative f => a -> f a
pure (Lambda GPU -> BuilderT GPU (State VNameSource) (Lambda GPU))
-> (Lambda -> Lambda GPU)
-> Lambda
-> BuilderT GPU (State VNameSource) (Lambda GPU)
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Lambda -> Lambda GPU
soacsLambdaToGPU
transformStm KernelPath
_ Stm
stm =
  Builder GPU () -> DistribM GPUStms
forall (m :: * -> *) somerep rep a.
(MonadFreshNames m, HasScope somerep m, SameScope somerep rep) =>
Builder rep a -> m (Stms rep)
runBuilder_ (Builder GPU () -> DistribM GPUStms)
-> Builder GPU () -> DistribM GPUStms
forall a b. (a -> b) -> a -> b
$ Stm -> Builder GPU ()
forall (m :: * -> *).
(Transformer m, LetDec (Rep m) ~ LetDec SOACS) =>
Stm -> m ()
FOT.transformStmRecursively Stm
stm

sufficientParallelism ::
  String ->
  [SubExp] ->
  KernelPath ->
  Maybe Int64 ->
  DistribM ((SubExp, Name), Out.Stms Out.GPU)
sufficientParallelism :: String
-> [SubExp]
-> KernelPath
-> Maybe Int64
-> DistribM ((SubExp, Name), GPUStms)
sufficientParallelism String
desc [SubExp]
ws KernelPath
path Maybe Int64
def =
  String
-> SizeClass -> [SubExp] -> DistribM ((SubExp, Name), GPUStms)
cmpSizeLe String
desc (KernelPath -> Maybe Int64 -> SizeClass
Out.SizeThreshold KernelPath
path Maybe Int64
def) [SubExp]
ws

-- | Intra-group parallelism is worthwhile if the lambda contains more
-- than one instance of non-map nested parallelism, or any nested
-- parallelism inside a loop.
worthIntraGroup :: Lambda -> Bool
worthIntraGroup :: Lambda -> Bool
worthIntraGroup Lambda
lam = BodyT SOACS -> Int
forall rep. (Op rep ~ SOAC rep) => BodyT rep -> Int
bodyInterest (Lambda -> BodyT SOACS
forall rep. LambdaT rep -> BodyT rep
lambdaBody Lambda
lam) Int -> Int -> Bool
forall a. Ord a => a -> a -> Bool
> Int
1
  where
    bodyInterest :: BodyT rep -> Int
bodyInterest BodyT rep
body =
      Seq Int -> Int
forall (t :: * -> *) a. (Foldable t, Num a) => t a -> a
sum (Seq Int -> Int) -> Seq Int -> Int
forall a b. (a -> b) -> a -> b
$ Stm rep -> Int
interest (Stm rep -> Int) -> Seq (Stm rep) -> Seq Int
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> BodyT rep -> Seq (Stm rep)
forall rep. BodyT rep -> Stms rep
bodyStms BodyT rep
body
    interest :: Stm rep -> Int
interest Stm rep
stm
      | Attr
"sequential" Attr -> Attrs -> Bool
`inAttrs` Attrs
attrs =
        Int
0 :: Int
      | Op (Screma w _ form) <- Stm rep -> ExpT rep
forall rep. Stm rep -> Exp rep
stmExp Stm rep
stm,
        Just Lambda rep
lam' <- ScremaForm rep -> Maybe (Lambda rep)
forall rep. ScremaForm rep -> Maybe (Lambda rep)
isMapSOAC ScremaForm rep
form =
        SubExp -> Lambda rep -> Int
mapLike SubExp
w Lambda rep
lam'
      | Op (Scatter w _ lam' _) <- Stm rep -> ExpT rep
forall rep. Stm rep -> Exp rep
stmExp Stm rep
stm =
        SubExp -> Lambda rep -> Int
mapLike SubExp
w Lambda rep
lam'
      | DoLoop [(FParam rep, SubExp)]
_ LoopForm rep
_ BodyT rep
body <- Stm rep -> ExpT rep
forall rep. Stm rep -> Exp rep
stmExp Stm rep
stm =
        BodyT rep -> Int
bodyInterest BodyT rep
body Int -> Int -> Int
forall a. Num a => a -> a -> a
* Int
10
      | If SubExp
_ BodyT rep
tbody BodyT rep
fbody IfDec (BranchType rep)
_ <- Stm rep -> ExpT rep
forall rep. Stm rep -> Exp rep
stmExp Stm rep
stm =
        Int -> Int -> Int
forall a. Ord a => a -> a -> a
max (BodyT rep -> Int
bodyInterest BodyT rep
tbody) (BodyT rep -> Int
bodyInterest BodyT rep
fbody)
      | Op (Screma w _ (ScremaForm _ _ lam')) <- Stm rep -> ExpT rep
forall rep. Stm rep -> Exp rep
stmExp Stm rep
stm =
        SubExp -> Int
forall p. Num p => SubExp -> p
zeroIfTooSmall SubExp
w Int -> Int -> Int
forall a. Num a => a -> a -> a
+ BodyT rep -> Int
bodyInterest (Lambda rep -> BodyT rep
forall rep. LambdaT rep -> BodyT rep
lambdaBody Lambda rep
lam')
      | Op (Stream _ _ Sequential _ lam') <- Stm rep -> ExpT rep
forall rep. Stm rep -> Exp rep
stmExp Stm rep
stm =
        BodyT rep -> Int
bodyInterest (BodyT rep -> Int) -> BodyT rep -> Int
forall a b. (a -> b) -> a -> b
$ Lambda rep -> BodyT rep
forall rep. LambdaT rep -> BodyT rep
lambdaBody Lambda rep
lam'
      | Bool
otherwise =
        Int
0
      where
        attrs :: Attrs
attrs = StmAux (ExpDec rep) -> Attrs
forall dec. StmAux dec -> Attrs
stmAuxAttrs (StmAux (ExpDec rep) -> Attrs) -> StmAux (ExpDec rep) -> Attrs
forall a b. (a -> b) -> a -> b
$ Stm rep -> StmAux (ExpDec rep)
forall rep. Stm rep -> StmAux (ExpDec rep)
stmAux Stm rep
stm
        sequential_inner :: Bool
sequential_inner = Attr
"sequential_inner" Attr -> Attrs -> Bool
`inAttrs` Attrs
attrs

        zeroIfTooSmall :: SubExp -> p
zeroIfTooSmall (Constant (IntValue IntValue
x))
          | IntValue -> Int64
intToInt64 IntValue
x Int64 -> Int64 -> Bool
forall a. Ord a => a -> a -> Bool
< Int64
32 = p
0
        zeroIfTooSmall SubExp
_ = p
1

        mapLike :: SubExp -> Lambda rep -> Int
mapLike SubExp
w Lambda rep
lam' =
          if Bool
sequential_inner
            then Int
0
            else Int -> Int -> Int
forall a. Ord a => a -> a -> a
max (SubExp -> Int
forall p. Num p => SubExp -> p
zeroIfTooSmall SubExp
w) (BodyT rep -> Int
bodyInterest (Lambda rep -> BodyT rep
forall rep. LambdaT rep -> BodyT rep
lambdaBody Lambda rep
lam'))

-- | A lambda is worth sequentialising if it contains enough nested
-- parallelism of an interesting kind.
worthSequentialising :: Lambda -> Bool
worthSequentialising :: Lambda -> Bool
worthSequentialising Lambda
lam = BodyT SOACS -> Int
forall rep. (Op rep ~ SOAC rep) => BodyT rep -> Int
bodyInterest (Lambda -> BodyT SOACS
forall rep. LambdaT rep -> BodyT rep
lambdaBody Lambda
lam) Int -> Int -> Bool
forall a. Ord a => a -> a -> Bool
> Int
1
  where
    bodyInterest :: BodyT rep -> Int
bodyInterest BodyT rep
body =
      Seq Int -> Int
forall (t :: * -> *) a. (Foldable t, Num a) => t a -> a
sum (Seq Int -> Int) -> Seq Int -> Int
forall a b. (a -> b) -> a -> b
$ Stm rep -> Int
interest (Stm rep -> Int) -> Seq (Stm rep) -> Seq Int
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> BodyT rep -> Seq (Stm rep)
forall rep. BodyT rep -> Stms rep
bodyStms BodyT rep
body
    interest :: Stm rep -> Int
interest Stm rep
stm
      | Attr
"sequential" Attr -> Attrs -> Bool
`inAttrs` Attrs
attrs =
        Int
0 :: Int
      | Op (Screma _ _ form@(ScremaForm _ _ lam')) <- Stm rep -> ExpT rep
forall rep. Stm rep -> Exp rep
stmExp Stm rep
stm,
        Maybe (Lambda rep) -> Bool
forall a. Maybe a -> Bool
isJust (Maybe (Lambda rep) -> Bool) -> Maybe (Lambda rep) -> Bool
forall a b. (a -> b) -> a -> b
$ ScremaForm rep -> Maybe (Lambda rep)
forall rep. ScremaForm rep -> Maybe (Lambda rep)
isMapSOAC ScremaForm rep
form =
        if Bool
sequential_inner
          then Int
0
          else BodyT rep -> Int
bodyInterest (Lambda rep -> BodyT rep
forall rep. LambdaT rep -> BodyT rep
lambdaBody Lambda rep
lam')
      | Op Scatter {} <- Stm rep -> ExpT rep
forall rep. Stm rep -> Exp rep
stmExp Stm rep
stm =
        Int
0 -- Basically a map.
      | DoLoop [(FParam rep, SubExp)]
_ ForLoop {} BodyT rep
body <- Stm rep -> ExpT rep
forall rep. Stm rep -> Exp rep
stmExp Stm rep
stm =
        BodyT rep -> Int
bodyInterest BodyT rep
body Int -> Int -> Int
forall a. Num a => a -> a -> a
* Int
10
      | WithAcc [WithAccInput rep]
_ Lambda rep
withacc_lam <- Stm rep -> ExpT rep
forall rep. Stm rep -> Exp rep
stmExp Stm rep
stm =
        BodyT rep -> Int
bodyInterest (Lambda rep -> BodyT rep
forall rep. LambdaT rep -> BodyT rep
lambdaBody Lambda rep
withacc_lam)
      | Op (Screma _ _ form@(ScremaForm _ _ lam')) <- Stm rep -> ExpT rep
forall rep. Stm rep -> Exp rep
stmExp Stm rep
stm =
        Int
1 Int -> Int -> Int
forall a. Num a => a -> a -> a
+ BodyT rep -> Int
bodyInterest (Lambda rep -> BodyT rep
forall rep. LambdaT rep -> BodyT rep
lambdaBody Lambda rep
lam')
          Int -> Int -> Int
forall a. Num a => a -> a -> a
+
          -- Give this a bigger score if it's a redomap, as these
          -- are often tileable and thus benefit more from
          -- sequentialisation.
          case ScremaForm rep -> Maybe ([Reduce rep], Lambda rep)
forall rep. ScremaForm rep -> Maybe ([Reduce rep], Lambda rep)
isRedomapSOAC ScremaForm rep
form of
            Just ([Reduce rep], Lambda rep)
_ -> Int
1
            Maybe ([Reduce rep], Lambda rep)
Nothing -> Int
0
      | Bool
otherwise =
        Int
0
      where
        attrs :: Attrs
attrs = StmAux (ExpDec rep) -> Attrs
forall dec. StmAux dec -> Attrs
stmAuxAttrs (StmAux (ExpDec rep) -> Attrs) -> StmAux (ExpDec rep) -> Attrs
forall a b. (a -> b) -> a -> b
$ Stm rep -> StmAux (ExpDec rep)
forall rep. Stm rep -> StmAux (ExpDec rep)
stmAux Stm rep
stm
        sequential_inner :: Bool
sequential_inner = Attr
"sequential_inner" Attr -> Attrs -> Bool
`inAttrs` Attrs
attrs

onTopLevelStms ::
  KernelPath ->
  Stms SOACS ->
  DistNestT Out.GPU DistribM GPUStms
onTopLevelStms :: KernelPath -> Stms SOACS -> DistNestT GPU DistribM GPUStms
onTopLevelStms KernelPath
path Stms SOACS
stms =
  DistribM GPUStms -> DistNestT GPU DistribM GPUStms
forall rep (m :: * -> *) a.
(LocalScope rep m, DistRep rep) =>
m a -> DistNestT rep m a
liftInner (DistribM GPUStms -> DistNestT GPU DistribM GPUStms)
-> DistribM GPUStms -> DistNestT GPU DistribM GPUStms
forall a b. (a -> b) -> a -> b
$ KernelPath -> [Stm] -> DistribM GPUStms
transformStms KernelPath
path ([Stm] -> DistribM GPUStms) -> [Stm] -> DistribM GPUStms
forall a b. (a -> b) -> a -> b
$ Stms SOACS -> [Stm]
forall rep. Stms rep -> [Stm rep]
stmsToList Stms SOACS
stms

onMap :: KernelPath -> MapLoop -> DistribM GPUStms
onMap :: KernelPath -> MapLoop -> DistribM GPUStms
onMap KernelPath
path (MapLoop Pat SOACS
pat StmAux ()
aux SubExp
w Lambda
lam [VName]
arrs) = do
  Scope GPU
types <- DistribM (Scope GPU)
forall rep (m :: * -> *). HasScope rep m => m (Scope rep)
askScope
  let loopnest :: LoopNesting
loopnest = PatT Type
-> StmAux () -> SubExp -> [(Param Type, VName)] -> LoopNesting
MapNesting PatT Type
Pat SOACS
pat StmAux ()
aux SubExp
w ([(Param Type, VName)] -> LoopNesting)
-> [(Param Type, VName)] -> LoopNesting
forall a b. (a -> b) -> a -> b
$ [Param Type] -> [VName] -> [(Param Type, VName)]
forall a b. [a] -> [b] -> [(a, b)]
zip (Lambda -> [LParam SOACS]
forall rep. LambdaT rep -> [LParam rep]
lambdaParams Lambda
lam) [VName]
arrs
      env :: KernelPath -> DistEnv GPU DistribM
env KernelPath
path' =
        DistEnv :: forall rep (m :: * -> *).
Nestings
-> Scope rep
-> (Stms SOACS -> DistNestT rep m (Stms rep))
-> (MapLoop -> DistAcc rep -> DistNestT rep m (DistAcc rep))
-> (Stm -> Builder rep (Stms rep))
-> (Lambda -> Builder rep (Lambda rep))
-> MkSegLevel rep m
-> DistEnv rep m
DistEnv
          { distNest :: Nestings
distNest = Nesting -> Nestings
singleNesting (Names -> LoopNesting -> Nesting
Nesting Names
forall a. Monoid a => a
mempty LoopNesting
loopnest),
            distScope :: Scope GPU
distScope =
              PatT Type -> Scope GPU
forall rep dec. (LetDec rep ~ dec) => PatT dec -> Scope rep
scopeOfPat PatT Type
Pat SOACS
pat
                Scope GPU -> Scope GPU -> Scope GPU
forall a. Semigroup a => a -> a -> a
<> Scope SOACS -> Scope GPU
scopeForGPU (Lambda -> Scope SOACS
forall rep a. Scoped rep a => a -> Scope rep
scopeOf Lambda
lam)
                Scope GPU -> Scope GPU -> Scope GPU
forall a. Semigroup a => a -> a -> a
<> Scope GPU
types,
            distOnInnerMap :: MapLoop -> DistAcc GPU -> DistNestT GPU DistribM (DistAcc GPU)
distOnInnerMap = KernelPath
-> MapLoop -> DistAcc GPU -> DistNestT GPU DistribM (DistAcc GPU)
onInnerMap KernelPath
path',
            distOnTopLevelStms :: Stms SOACS -> DistNestT GPU DistribM GPUStms
distOnTopLevelStms = KernelPath -> Stms SOACS -> DistNestT GPU DistribM GPUStms
onTopLevelStms KernelPath
path',
            distSegLevel :: MkSegLevel GPU DistribM
distSegLevel = MkSegLevel GPU DistribM
forall (m :: * -> *). MonadFreshNames m => MkSegLevel GPU m
segThreadCapped,
            distOnSOACSStms :: Stm -> BuilderT GPU (State VNameSource) GPUStms
distOnSOACSStms = GPUStms -> BuilderT GPU (State VNameSource) GPUStms
forall (f :: * -> *) a. Applicative f => a -> f a
pure (GPUStms -> BuilderT GPU (State VNameSource) GPUStms)
-> (Stm -> GPUStms)
-> Stm
-> BuilderT GPU (State VNameSource) GPUStms
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Stm GPU -> GPUStms
forall rep. Stm rep -> Stms rep
oneStm (Stm GPU -> GPUStms) -> (Stm -> Stm GPU) -> Stm -> GPUStms
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Stm -> Stm GPU
soacsStmToGPU,
            distOnSOACSLambda :: Lambda -> BuilderT GPU (State VNameSource) (Lambda GPU)
distOnSOACSLambda = Lambda GPU -> BuilderT GPU (State VNameSource) (Lambda GPU)
forall (f :: * -> *) a. Applicative f => a -> f a
pure (Lambda GPU -> BuilderT GPU (State VNameSource) (Lambda GPU))
-> (Lambda -> Lambda GPU)
-> Lambda
-> BuilderT GPU (State VNameSource) (Lambda GPU)
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Lambda -> Lambda GPU
soacsLambdaToGPU
          }
      exploitInnerParallelism :: KernelPath -> DistribM GPUStms
exploitInnerParallelism KernelPath
path' =
        DistEnv GPU DistribM
-> DistNestT GPU DistribM (DistAcc GPU) -> DistribM GPUStms
forall (m :: * -> *) rep.
(MonadLogger m, DistRep rep) =>
DistEnv rep m -> DistNestT rep m (DistAcc rep) -> m (Stms rep)
runDistNestT (KernelPath -> DistEnv GPU DistribM
env KernelPath
path') (DistNestT GPU DistribM (DistAcc GPU) -> DistribM GPUStms)
-> DistNestT GPU DistribM (DistAcc GPU) -> DistribM GPUStms
forall a b. (a -> b) -> a -> b
$
          DistAcc GPU -> Stms SOACS -> DistNestT GPU DistribM (DistAcc GPU)
forall (m :: * -> *) rep.
(MonadFreshNames m, LocalScope rep m, DistRep rep) =>
DistAcc rep -> Stms SOACS -> DistNestT rep m (DistAcc rep)
distributeMapBodyStms DistAcc GPU
acc (BodyT SOACS -> Stms SOACS
forall rep. BodyT rep -> Stms rep
bodyStms (BodyT SOACS -> Stms SOACS) -> BodyT SOACS -> Stms SOACS
forall a b. (a -> b) -> a -> b
$ Lambda -> BodyT SOACS
forall rep. LambdaT rep -> BodyT rep
lambdaBody Lambda
lam)

  let exploitOuterParallelism :: KernelPath -> DistribM GPUStms
exploitOuterParallelism KernelPath
path' = do
        let lam' :: Lambda GPU
lam' = Lambda -> Lambda GPU
soacsLambdaToGPU Lambda
lam
        DistEnv GPU DistribM
-> DistNestT GPU DistribM (DistAcc GPU) -> DistribM GPUStms
forall (m :: * -> *) rep.
(MonadLogger m, DistRep rep) =>
DistEnv rep m -> DistNestT rep m (DistAcc rep) -> m (Stms rep)
runDistNestT (KernelPath -> DistEnv GPU DistribM
env KernelPath
path') (DistNestT GPU DistribM (DistAcc GPU) -> DistribM GPUStms)
-> DistNestT GPU DistribM (DistAcc GPU) -> DistribM GPUStms
forall a b. (a -> b) -> a -> b
$
          DistAcc GPU -> DistNestT GPU DistribM (DistAcc GPU)
forall (m :: * -> *) rep.
(MonadFreshNames m, LocalScope rep m, DistRep rep) =>
DistAcc rep -> DistNestT rep m (DistAcc rep)
distribute (DistAcc GPU -> DistNestT GPU DistribM (DistAcc GPU))
-> DistAcc GPU -> DistNestT GPU DistribM (DistAcc GPU)
forall a b. (a -> b) -> a -> b
$
            GPUStms -> DistAcc GPU -> DistAcc GPU
forall rep. Stms rep -> DistAcc rep -> DistAcc rep
addStmsToAcc (Body GPU -> GPUStms
forall rep. BodyT rep -> Stms rep
bodyStms (Body GPU -> GPUStms) -> Body GPU -> GPUStms
forall a b. (a -> b) -> a -> b
$ Lambda GPU -> Body GPU
forall rep. LambdaT rep -> BodyT rep
lambdaBody Lambda GPU
lam') DistAcc GPU
acc

  KernelNest
-> KernelPath
-> (KernelPath -> DistribM GPUStms)
-> (KernelPath -> DistribM GPUStms)
-> Pat SOACS
-> Lambda
-> DistribM GPUStms
onMap' (LoopNesting -> KernelNest
newKernel LoopNesting
loopnest) KernelPath
path KernelPath -> DistribM GPUStms
exploitOuterParallelism KernelPath -> DistribM GPUStms
exploitInnerParallelism Pat SOACS
pat Lambda
lam
  where
    acc :: DistAcc GPU
acc =
      DistAcc :: forall rep. Targets -> Stms rep -> DistAcc rep
DistAcc
        { distTargets :: Targets
distTargets = Target -> Targets
singleTarget (PatT Type
Pat SOACS
pat, BodyT SOACS -> Result
forall rep. BodyT rep -> Result
bodyResult (BodyT SOACS -> Result) -> BodyT SOACS -> Result
forall a b. (a -> b) -> a -> b
$ Lambda -> BodyT SOACS
forall rep. LambdaT rep -> BodyT rep
lambdaBody Lambda
lam),
          distStms :: GPUStms
distStms = GPUStms
forall a. Monoid a => a
mempty
        }

onlyExploitIntra :: Attrs -> Bool
onlyExploitIntra :: Attrs -> Bool
onlyExploitIntra Attrs
attrs =
  Name -> [Attr] -> Attr
AttrComp Name
"incremental_flattening" [Attr
"only_intra"] Attr -> Attrs -> Bool
`inAttrs` Attrs
attrs

mayExploitOuter :: Attrs -> Bool
mayExploitOuter :: Attrs -> Bool
mayExploitOuter Attrs
attrs =
  Bool -> Bool
not (Bool -> Bool) -> Bool -> Bool
forall a b. (a -> b) -> a -> b
$
    Name -> [Attr] -> Attr
AttrComp Name
"incremental_flattening" [Attr
"no_outer"] Attr -> Attrs -> Bool
`inAttrs` Attrs
attrs
      Bool -> Bool -> Bool
|| Name -> [Attr] -> Attr
AttrComp Name
"incremental_flattening" [Attr
"only_inner"] Attr -> Attrs -> Bool
`inAttrs` Attrs
attrs

mayExploitIntra :: Attrs -> Bool
mayExploitIntra :: Attrs -> Bool
mayExploitIntra Attrs
attrs =
  Bool -> Bool
not (Bool -> Bool) -> Bool -> Bool
forall a b. (a -> b) -> a -> b
$
    Name -> [Attr] -> Attr
AttrComp Name
"incremental_flattening" [Attr
"no_intra"] Attr -> Attrs -> Bool
`inAttrs` Attrs
attrs
      Bool -> Bool -> Bool
|| Name -> [Attr] -> Attr
AttrComp Name
"incremental_flattening" [Attr
"only_inner"] Attr -> Attrs -> Bool
`inAttrs` Attrs
attrs

-- The minimum amount of inner parallelism we require (by default) in
-- intra-group versions.  Less than this is usually pointless on a GPU
-- (but we allow tuning to change it).
intraMinInnerPar :: Int64
intraMinInnerPar :: Int64
intraMinInnerPar = Int64
32 -- One NVIDIA warp

onMap' ::
  KernelNest ->
  KernelPath ->
  (KernelPath -> DistribM (Out.Stms Out.GPU)) ->
  (KernelPath -> DistribM (Out.Stms Out.GPU)) ->
  Pat ->
  Lambda ->
  DistribM (Out.Stms Out.GPU)
onMap' :: KernelNest
-> KernelPath
-> (KernelPath -> DistribM GPUStms)
-> (KernelPath -> DistribM GPUStms)
-> Pat SOACS
-> Lambda
-> DistribM GPUStms
onMap' KernelNest
loopnest KernelPath
path KernelPath -> DistribM GPUStms
mk_seq_stms KernelPath -> DistribM GPUStms
mk_par_stms Pat SOACS
pat Lambda
lam = do
  -- Some of the control flow here looks a bit convoluted because we
  -- are trying to avoid generating unneeded threshold parameters,
  -- which means we need to do all the pruning checks up front.

  Scope GPU
types <- DistribM (Scope GPU)
forall rep (m :: * -> *). HasScope rep m => m (Scope rep)
askScope

  Maybe ((SubExp, SubExp), SubExp, Log, GPUStms, GPUStms)
intra <-
    if Attrs -> Bool
onlyExploitIntra (StmAux () -> Attrs
forall dec. StmAux dec -> Attrs
stmAuxAttrs StmAux ()
aux)
      Bool -> Bool -> Bool
|| (Lambda -> Bool
worthIntraGroup Lambda
lam Bool -> Bool -> Bool
&& Attrs -> Bool
mayExploitIntra Attrs
attrs)
      then (ReaderT
   (Scope GPU)
   DistribM
   (Maybe ((SubExp, SubExp), SubExp, Log, GPUStms, GPUStms))
 -> Scope GPU
 -> DistribM
      (Maybe ((SubExp, SubExp), SubExp, Log, GPUStms, GPUStms)))
-> Scope GPU
-> ReaderT
     (Scope GPU)
     DistribM
     (Maybe ((SubExp, SubExp), SubExp, Log, GPUStms, GPUStms))
-> DistribM
     (Maybe ((SubExp, SubExp), SubExp, Log, GPUStms, GPUStms))
forall a b c. (a -> b -> c) -> b -> a -> c
flip ReaderT
  (Scope GPU)
  DistribM
  (Maybe ((SubExp, SubExp), SubExp, Log, GPUStms, GPUStms))
-> Scope GPU
-> DistribM
     (Maybe ((SubExp, SubExp), SubExp, Log, GPUStms, GPUStms))
forall r (m :: * -> *) a. ReaderT r m a -> r -> m a
runReaderT Scope GPU
types (ReaderT
   (Scope GPU)
   DistribM
   (Maybe ((SubExp, SubExp), SubExp, Log, GPUStms, GPUStms))
 -> DistribM
      (Maybe ((SubExp, SubExp), SubExp, Log, GPUStms, GPUStms)))
-> ReaderT
     (Scope GPU)
     DistribM
     (Maybe ((SubExp, SubExp), SubExp, Log, GPUStms, GPUStms))
-> DistribM
     (Maybe ((SubExp, SubExp), SubExp, Log, GPUStms, GPUStms))
forall a b. (a -> b) -> a -> b
$ KernelNest
-> Lambda
-> ReaderT
     (Scope GPU)
     DistribM
     (Maybe ((SubExp, SubExp), SubExp, Log, GPUStms, GPUStms))
forall (m :: * -> *).
(MonadFreshNames m, LocalScope GPU m) =>
KernelNest
-> Lambda
-> m (Maybe ((SubExp, SubExp), SubExp, Log, GPUStms, GPUStms))
intraGroupParallelise KernelNest
loopnest Lambda
lam
      else Maybe ((SubExp, SubExp), SubExp, Log, GPUStms, GPUStms)
-> DistribM
     (Maybe ((SubExp, SubExp), SubExp, Log, GPUStms, GPUStms))
forall (m :: * -> *) a. Monad m => a -> m a
return Maybe ((SubExp, SubExp), SubExp, Log, GPUStms, GPUStms)
forall a. Maybe a
Nothing

  case Maybe ((SubExp, SubExp), SubExp, Log, GPUStms, GPUStms)
intra of
    Maybe ((SubExp, SubExp), SubExp, Log, GPUStms, GPUStms)
_ | Attr
"sequential_inner" Attr -> Attrs -> Bool
`inAttrs` Attrs
attrs -> do
      Body GPU
seq_body <- Body GPU -> DistribM (Body GPU)
forall rep (m :: * -> *).
(Renameable rep, MonadFreshNames m) =>
Body rep -> m (Body rep)
renameBody (Body GPU -> DistribM (Body GPU))
-> DistribM (Body GPU) -> DistribM (Body GPU)
forall (m :: * -> *) a b. Monad m => (a -> m b) -> m a -> m b
=<< GPUStms -> Result -> Body GPU
forall rep. Buildable rep => Stms rep -> Result -> Body rep
mkBody (GPUStms -> Result -> Body GPU)
-> DistribM GPUStms -> DistribM (Result -> Body GPU)
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> KernelPath -> DistribM GPUStms
mk_seq_stms KernelPath
path DistribM (Result -> Body GPU)
-> DistribM Result -> DistribM (Body GPU)
forall (f :: * -> *) a b. Applicative f => f (a -> b) -> f a -> f b
<*> Result -> DistribM Result
forall (f :: * -> *) a. Applicative f => a -> f a
pure Result
res
      Pat GPU -> Body GPU -> [(SubExp, Body GPU)] -> DistribM GPUStms
forall (m :: * -> *).
(MonadFreshNames m, HasScope GPU m) =>
Pat GPU -> Body GPU -> [(SubExp, Body GPU)] -> m GPUStms
kernelAlternatives Pat SOACS
Pat GPU
pat Body GPU
seq_body []
    --
    Maybe ((SubExp, SubExp), SubExp, Log, GPUStms, GPUStms)
Nothing
      | Just DistribM (SubExp, Name, GPUStms, Body GPU)
m <- Maybe (DistribM (SubExp, Name, GPUStms, Body GPU))
mkSeqAlts -> do
        (SubExp
outer_suff, Name
outer_suff_key, GPUStms
outer_suff_stms, Body GPU
seq_body) <- DistribM (SubExp, Name, GPUStms, Body GPU)
m
        Body GPU
par_body <-
          Body GPU -> DistribM (Body GPU)
forall rep (m :: * -> *).
(Renameable rep, MonadFreshNames m) =>
Body rep -> m (Body rep)
renameBody (Body GPU -> DistribM (Body GPU))
-> DistribM (Body GPU) -> DistribM (Body GPU)
forall (m :: * -> *) a b. Monad m => (a -> m b) -> m a -> m b
=<< GPUStms -> Result -> Body GPU
forall rep. Buildable rep => Stms rep -> Result -> Body rep
mkBody
            (GPUStms -> Result -> Body GPU)
-> DistribM GPUStms -> DistribM (Result -> Body GPU)
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> KernelPath -> DistribM GPUStms
mk_par_stms ((Name
outer_suff_key, Bool
False) (Name, Bool) -> KernelPath -> KernelPath
forall a. a -> [a] -> [a]
: KernelPath
path) DistribM (Result -> Body GPU)
-> DistribM Result -> DistribM (Body GPU)
forall (f :: * -> *) a b. Applicative f => f (a -> b) -> f a -> f b
<*> Result -> DistribM Result
forall (f :: * -> *) a. Applicative f => a -> f a
pure Result
res
        (GPUStms
outer_suff_stms GPUStms -> GPUStms -> GPUStms
forall a. Semigroup a => a -> a -> a
<>) (GPUStms -> GPUStms) -> DistribM GPUStms -> DistribM GPUStms
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> Pat GPU -> Body GPU -> [(SubExp, Body GPU)] -> DistribM GPUStms
forall (m :: * -> *).
(MonadFreshNames m, HasScope GPU m) =>
Pat GPU -> Body GPU -> [(SubExp, Body GPU)] -> m GPUStms
kernelAlternatives Pat SOACS
Pat GPU
pat Body GPU
par_body [(SubExp
outer_suff, Body GPU
seq_body)]
      --
      | Bool
otherwise -> do
        Body GPU
par_body <- Body GPU -> DistribM (Body GPU)
forall rep (m :: * -> *).
(Renameable rep, MonadFreshNames m) =>
Body rep -> m (Body rep)
renameBody (Body GPU -> DistribM (Body GPU))
-> DistribM (Body GPU) -> DistribM (Body GPU)
forall (m :: * -> *) a b. Monad m => (a -> m b) -> m a -> m b
=<< GPUStms -> Result -> Body GPU
forall rep. Buildable rep => Stms rep -> Result -> Body rep
mkBody (GPUStms -> Result -> Body GPU)
-> DistribM GPUStms -> DistribM (Result -> Body GPU)
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> KernelPath -> DistribM GPUStms
mk_par_stms KernelPath
path DistribM (Result -> Body GPU)
-> DistribM Result -> DistribM (Body GPU)
forall (f :: * -> *) a b. Applicative f => f (a -> b) -> f a -> f b
<*> Result -> DistribM Result
forall (f :: * -> *) a. Applicative f => a -> f a
pure Result
res
        Pat GPU -> Body GPU -> [(SubExp, Body GPU)] -> DistribM GPUStms
forall (m :: * -> *).
(MonadFreshNames m, HasScope GPU m) =>
Pat GPU -> Body GPU -> [(SubExp, Body GPU)] -> m GPUStms
kernelAlternatives Pat SOACS
Pat GPU
pat Body GPU
par_body []
    --
    Just intra' :: ((SubExp, SubExp), SubExp, Log, GPUStms, GPUStms)
intra'@((SubExp, SubExp)
_, SubExp
_, Log
log, GPUStms
intra_prelude, GPUStms
intra_stms)
      | Attrs -> Bool
onlyExploitIntra Attrs
attrs -> do
        Log -> DistribM ()
forall (m :: * -> *). MonadLogger m => Log -> m ()
addLog Log
log
        Body GPU
group_par_body <- Body GPU -> DistribM (Body GPU)
forall rep (m :: * -> *).
(Renameable rep, MonadFreshNames m) =>
Body rep -> m (Body rep)
renameBody (Body GPU -> DistribM (Body GPU))
-> Body GPU -> DistribM (Body GPU)
forall a b. (a -> b) -> a -> b
$ GPUStms -> Result -> Body GPU
forall rep. Buildable rep => Stms rep -> Result -> Body rep
mkBody GPUStms
intra_stms Result
res
        (GPUStms
intra_prelude GPUStms -> GPUStms -> GPUStms
forall a. Semigroup a => a -> a -> a
<>) (GPUStms -> GPUStms) -> DistribM GPUStms -> DistribM GPUStms
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> Pat GPU -> Body GPU -> [(SubExp, Body GPU)] -> DistribM GPUStms
forall (m :: * -> *).
(MonadFreshNames m, HasScope GPU m) =>
Pat GPU -> Body GPU -> [(SubExp, Body GPU)] -> m GPUStms
kernelAlternatives Pat SOACS
Pat GPU
pat Body GPU
group_par_body []
      --
      | Bool
otherwise -> do
        Log -> DistribM ()
forall (m :: * -> *). MonadLogger m => Log -> m ()
addLog Log
log

        case Maybe (DistribM (SubExp, Name, GPUStms, Body GPU))
mkSeqAlts of
          Maybe (DistribM (SubExp, Name, GPUStms, Body GPU))
Nothing -> do
            (Body GPU
group_par_body, SubExp
intra_ok, Name
intra_suff_key, GPUStms
intra_suff_stms) <-
              KernelPath
-> ((SubExp, SubExp), SubExp, Log, GPUStms, GPUStms)
-> DistribM (Body GPU, SubExp, Name, GPUStms)
checkSuffIntraPar KernelPath
path ((SubExp, SubExp), SubExp, Log, GPUStms, GPUStms)
intra'

            Body GPU
par_body <-
              Body GPU -> DistribM (Body GPU)
forall rep (m :: * -> *).
(Renameable rep, MonadFreshNames m) =>
Body rep -> m (Body rep)
renameBody (Body GPU -> DistribM (Body GPU))
-> DistribM (Body GPU) -> DistribM (Body GPU)
forall (m :: * -> *) a b. Monad m => (a -> m b) -> m a -> m b
=<< GPUStms -> Result -> Body GPU
forall rep. Buildable rep => Stms rep -> Result -> Body rep
mkBody
                (GPUStms -> Result -> Body GPU)
-> DistribM GPUStms -> DistribM (Result -> Body GPU)
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> KernelPath -> DistribM GPUStms
mk_par_stms ((Name
intra_suff_key, Bool
False) (Name, Bool) -> KernelPath -> KernelPath
forall a. a -> [a] -> [a]
: KernelPath
path) DistribM (Result -> Body GPU)
-> DistribM Result -> DistribM (Body GPU)
forall (f :: * -> *) a b. Applicative f => f (a -> b) -> f a -> f b
<*> Result -> DistribM Result
forall (f :: * -> *) a. Applicative f => a -> f a
pure Result
res

            (GPUStms
intra_suff_stms GPUStms -> GPUStms -> GPUStms
forall a. Semigroup a => a -> a -> a
<>)
              (GPUStms -> GPUStms) -> DistribM GPUStms -> DistribM GPUStms
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> Pat GPU -> Body GPU -> [(SubExp, Body GPU)] -> DistribM GPUStms
forall (m :: * -> *).
(MonadFreshNames m, HasScope GPU m) =>
Pat GPU -> Body GPU -> [(SubExp, Body GPU)] -> m GPUStms
kernelAlternatives Pat SOACS
Pat GPU
pat Body GPU
par_body [(SubExp
intra_ok, Body GPU
group_par_body)]
          Just DistribM (SubExp, Name, GPUStms, Body GPU)
m -> do
            (SubExp
outer_suff, Name
outer_suff_key, GPUStms
outer_suff_stms, Body GPU
seq_body) <- DistribM (SubExp, Name, GPUStms, Body GPU)
m

            (Body GPU
group_par_body, SubExp
intra_ok, Name
intra_suff_key, GPUStms
intra_suff_stms) <-
              KernelPath
-> ((SubExp, SubExp), SubExp, Log, GPUStms, GPUStms)
-> DistribM (Body GPU, SubExp, Name, GPUStms)
checkSuffIntraPar ((Name
outer_suff_key, Bool
False) (Name, Bool) -> KernelPath -> KernelPath
forall a. a -> [a] -> [a]
: KernelPath
path) ((SubExp, SubExp), SubExp, Log, GPUStms, GPUStms)
intra'

            Body GPU
par_body <-
              Body GPU -> DistribM (Body GPU)
forall rep (m :: * -> *).
(Renameable rep, MonadFreshNames m) =>
Body rep -> m (Body rep)
renameBody (Body GPU -> DistribM (Body GPU))
-> DistribM (Body GPU) -> DistribM (Body GPU)
forall (m :: * -> *) a b. Monad m => (a -> m b) -> m a -> m b
=<< GPUStms -> Result -> Body GPU
forall rep. Buildable rep => Stms rep -> Result -> Body rep
mkBody
                (GPUStms -> Result -> Body GPU)
-> DistribM GPUStms -> DistribM (Result -> Body GPU)
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> KernelPath -> DistribM GPUStms
mk_par_stms
                  ( [ (Name
outer_suff_key, Bool
False),
                      (Name
intra_suff_key, Bool
False)
                    ]
                      KernelPath -> KernelPath -> KernelPath
forall a. [a] -> [a] -> [a]
++ KernelPath
path
                  )
                  DistribM (Result -> Body GPU)
-> DistribM Result -> DistribM (Body GPU)
forall (f :: * -> *) a b. Applicative f => f (a -> b) -> f a -> f b
<*> Result -> DistribM Result
forall (f :: * -> *) a. Applicative f => a -> f a
pure Result
res

            ((GPUStms
outer_suff_stms GPUStms -> GPUStms -> GPUStms
forall a. Semigroup a => a -> a -> a
<> GPUStms
intra_suff_stms) GPUStms -> GPUStms -> GPUStms
forall a. Semigroup a => a -> a -> a
<>)
              (GPUStms -> GPUStms) -> DistribM GPUStms -> DistribM GPUStms
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> Pat GPU -> Body GPU -> [(SubExp, Body GPU)] -> DistribM GPUStms
forall (m :: * -> *).
(MonadFreshNames m, HasScope GPU m) =>
Pat GPU -> Body GPU -> [(SubExp, Body GPU)] -> m GPUStms
kernelAlternatives
                Pat SOACS
Pat GPU
pat
                Body GPU
par_body
                [(SubExp
outer_suff, Body GPU
seq_body), (SubExp
intra_ok, Body GPU
group_par_body)]
  where
    nest_ws :: [SubExp]
nest_ws = KernelNest -> [SubExp]
kernelNestWidths KernelNest
loopnest
    res :: Result
res = [VName] -> Result
varsRes ([VName] -> Result) -> [VName] -> Result
forall a b. (a -> b) -> a -> b
$ PatT Type -> [VName]
forall dec. PatT dec -> [VName]
patNames PatT Type
Pat SOACS
pat
    aux :: StmAux ()
aux = LoopNesting -> StmAux ()
loopNestingAux (LoopNesting -> StmAux ()) -> LoopNesting -> StmAux ()
forall a b. (a -> b) -> a -> b
$ KernelNest -> LoopNesting
innermostKernelNesting KernelNest
loopnest
    attrs :: Attrs
attrs = StmAux () -> Attrs
forall dec. StmAux dec -> Attrs
stmAuxAttrs StmAux ()
aux

    mkSeqAlts :: Maybe (DistribM (SubExp, Name, GPUStms, Body GPU))
mkSeqAlts
      | Lambda -> Bool
worthSequentialising Lambda
lam,
        Attrs -> Bool
mayExploitOuter Attrs
attrs = DistribM (SubExp, Name, GPUStms, Body GPU)
-> Maybe (DistribM (SubExp, Name, GPUStms, Body GPU))
forall a. a -> Maybe a
Just (DistribM (SubExp, Name, GPUStms, Body GPU)
 -> Maybe (DistribM (SubExp, Name, GPUStms, Body GPU)))
-> DistribM (SubExp, Name, GPUStms, Body GPU)
-> Maybe (DistribM (SubExp, Name, GPUStms, Body GPU))
forall a b. (a -> b) -> a -> b
$ do
        ((SubExp
outer_suff, Name
outer_suff_key), GPUStms
outer_suff_stms) <- DistribM ((SubExp, Name), GPUStms)
checkSuffOuterPar
        Body GPU
seq_body <-
          Body GPU -> DistribM (Body GPU)
forall rep (m :: * -> *).
(Renameable rep, MonadFreshNames m) =>
Body rep -> m (Body rep)
renameBody (Body GPU -> DistribM (Body GPU))
-> DistribM (Body GPU) -> DistribM (Body GPU)
forall (m :: * -> *) a b. Monad m => (a -> m b) -> m a -> m b
=<< GPUStms -> Result -> Body GPU
forall rep. Buildable rep => Stms rep -> Result -> Body rep
mkBody
            (GPUStms -> Result -> Body GPU)
-> DistribM GPUStms -> DistribM (Result -> Body GPU)
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> KernelPath -> DistribM GPUStms
mk_seq_stms ((Name
outer_suff_key, Bool
True) (Name, Bool) -> KernelPath -> KernelPath
forall a. a -> [a] -> [a]
: KernelPath
path) DistribM (Result -> Body GPU)
-> DistribM Result -> DistribM (Body GPU)
forall (f :: * -> *) a b. Applicative f => f (a -> b) -> f a -> f b
<*> Result -> DistribM Result
forall (f :: * -> *) a. Applicative f => a -> f a
pure Result
res
        (SubExp, Name, GPUStms, Body GPU)
-> DistribM (SubExp, Name, GPUStms, Body GPU)
forall (f :: * -> *) a. Applicative f => a -> f a
pure (SubExp
outer_suff, Name
outer_suff_key, GPUStms
outer_suff_stms, Body GPU
seq_body)
      | Bool
otherwise =
        Maybe (DistribM (SubExp, Name, GPUStms, Body GPU))
forall a. Maybe a
Nothing

    checkSuffOuterPar :: DistribM ((SubExp, Name), GPUStms)
checkSuffOuterPar =
      String
-> [SubExp]
-> KernelPath
-> Maybe Int64
-> DistribM ((SubExp, Name), GPUStms)
sufficientParallelism String
"suff_outer_par" [SubExp]
nest_ws KernelPath
path Maybe Int64
forall a. Maybe a
Nothing

    checkSuffIntraPar :: KernelPath
-> ((SubExp, SubExp), SubExp, Log, GPUStms, GPUStms)
-> DistribM (Body GPU, SubExp, Name, GPUStms)
checkSuffIntraPar
      KernelPath
path'
      ((SubExp
_intra_min_par, SubExp
intra_avail_par), SubExp
group_size, Log
_, GPUStms
intra_prelude, GPUStms
intra_stms) = do
        -- We must check that all intra-group parallelism fits in a group.
        ((SubExp
intra_ok, Name
intra_suff_key), GPUStms
intra_suff_stms) <- do
          ((SubExp
intra_suff, Name
suff_key), GPUStms
check_suff_stms) <-
            String
-> [SubExp]
-> KernelPath
-> Maybe Int64
-> DistribM ((SubExp, Name), GPUStms)
sufficientParallelism
              String
"suff_intra_par"
              [SubExp
intra_avail_par]
              KernelPath
path'
              (Int64 -> Maybe Int64
forall a. a -> Maybe a
Just Int64
intraMinInnerPar)

          Builder GPU (SubExp, Name) -> DistribM ((SubExp, Name), GPUStms)
forall (m :: * -> *) somerep rep a.
(MonadFreshNames m, HasScope somerep m, SameScope somerep rep) =>
Builder rep a -> m (a, Stms rep)
runBuilder (Builder GPU (SubExp, Name) -> DistribM ((SubExp, Name), GPUStms))
-> Builder GPU (SubExp, Name) -> DistribM ((SubExp, Name), GPUStms)
forall a b. (a -> b) -> a -> b
$ do
            Stms (Rep (BuilderT GPU (State VNameSource))) -> Builder GPU ()
forall (m :: * -> *). MonadBuilder m => Stms (Rep m) -> m ()
addStms Stms (Rep (BuilderT GPU (State VNameSource)))
GPUStms
intra_prelude

            SubExp
max_group_size <-
              String
-> Exp (Rep (BuilderT GPU (State VNameSource)))
-> BuilderT GPU (State VNameSource) SubExp
forall (m :: * -> *).
MonadBuilder m =>
String -> Exp (Rep m) -> m SubExp
letSubExp String
"max_group_size" (Exp (Rep (BuilderT GPU (State VNameSource)))
 -> BuilderT GPU (State VNameSource) SubExp)
-> Exp (Rep (BuilderT GPU (State VNameSource)))
-> BuilderT GPU (State VNameSource) SubExp
forall a b. (a -> b) -> a -> b
$ Op GPU -> ExpT GPU
forall rep. Op rep -> ExpT rep
Op (Op GPU -> ExpT GPU) -> Op GPU -> ExpT GPU
forall a b. (a -> b) -> a -> b
$ SizeOp -> HostOp GPU (SOAC GPU)
forall rep op. SizeOp -> HostOp rep op
SizeOp (SizeOp -> HostOp GPU (SOAC GPU))
-> SizeOp -> HostOp GPU (SOAC GPU)
forall a b. (a -> b) -> a -> b
$ SizeClass -> SizeOp
Out.GetSizeMax SizeClass
Out.SizeGroup
            SubExp
fits <-
              String
-> Exp (Rep (BuilderT GPU (State VNameSource)))
-> BuilderT GPU (State VNameSource) SubExp
forall (m :: * -> *).
MonadBuilder m =>
String -> Exp (Rep m) -> m SubExp
letSubExp String
"fits" (Exp (Rep (BuilderT GPU (State VNameSource)))
 -> BuilderT GPU (State VNameSource) SubExp)
-> Exp (Rep (BuilderT GPU (State VNameSource)))
-> BuilderT GPU (State VNameSource) SubExp
forall a b. (a -> b) -> a -> b
$
                BasicOp -> ExpT GPU
forall rep. BasicOp -> ExpT rep
BasicOp (BasicOp -> ExpT GPU) -> BasicOp -> ExpT GPU
forall a b. (a -> b) -> a -> b
$
                  CmpOp -> SubExp -> SubExp -> BasicOp
CmpOp (IntType -> CmpOp
CmpSle IntType
Int64) SubExp
group_size SubExp
max_group_size

            Stms (Rep (BuilderT GPU (State VNameSource))) -> Builder GPU ()
forall (m :: * -> *). MonadBuilder m => Stms (Rep m) -> m ()
addStms Stms (Rep (BuilderT GPU (State VNameSource)))
GPUStms
check_suff_stms

            SubExp
intra_ok <- String
-> Exp (Rep (BuilderT GPU (State VNameSource)))
-> BuilderT GPU (State VNameSource) SubExp
forall (m :: * -> *).
MonadBuilder m =>
String -> Exp (Rep m) -> m SubExp
letSubExp String
"intra_suff_and_fits" (Exp (Rep (BuilderT GPU (State VNameSource)))
 -> BuilderT GPU (State VNameSource) SubExp)
-> Exp (Rep (BuilderT GPU (State VNameSource)))
-> BuilderT GPU (State VNameSource) SubExp
forall a b. (a -> b) -> a -> b
$ BasicOp -> ExpT GPU
forall rep. BasicOp -> ExpT rep
BasicOp (BasicOp -> ExpT GPU) -> BasicOp -> ExpT GPU
forall a b. (a -> b) -> a -> b
$ BinOp -> SubExp -> SubExp -> BasicOp
BinOp BinOp
LogAnd SubExp
fits SubExp
intra_suff
            (SubExp, Name) -> Builder GPU (SubExp, Name)
forall (m :: * -> *) a. Monad m => a -> m a
return (SubExp
intra_ok, Name
suff_key)

        Body GPU
group_par_body <- Body GPU -> DistribM (Body GPU)
forall rep (m :: * -> *).
(Renameable rep, MonadFreshNames m) =>
Body rep -> m (Body rep)
renameBody (Body GPU -> DistribM (Body GPU))
-> Body GPU -> DistribM (Body GPU)
forall a b. (a -> b) -> a -> b
$ GPUStms -> Result -> Body GPU
forall rep. Buildable rep => Stms rep -> Result -> Body rep
mkBody GPUStms
intra_stms Result
res
        (Body GPU, SubExp, Name, GPUStms)
-> DistribM (Body GPU, SubExp, Name, GPUStms)
forall (f :: * -> *) a. Applicative f => a -> f a
pure (Body GPU
group_par_body, SubExp
intra_ok, Name
intra_suff_key, GPUStms
intra_suff_stms)

onInnerMap ::
  KernelPath ->
  MapLoop ->
  DistAcc Out.GPU ->
  DistNestT Out.GPU DistribM (DistAcc Out.GPU)
onInnerMap :: KernelPath
-> MapLoop -> DistAcc GPU -> DistNestT GPU DistribM (DistAcc GPU)
onInnerMap KernelPath
path maploop :: MapLoop
maploop@(MapLoop Pat SOACS
pat StmAux ()
aux SubExp
w Lambda
lam [VName]
arrs) DistAcc GPU
acc
  | Lambda -> Bool
unbalancedLambda Lambda
lam,
    Lambda -> Bool
lambdaContainsParallelism Lambda
lam =
    Stm -> DistAcc GPU -> DistNestT GPU DistribM (DistAcc GPU)
forall (m :: * -> *) rep.
(MonadFreshNames m, DistRep rep) =>
Stm -> DistAcc rep -> DistNestT rep m (DistAcc rep)
addStmToAcc (MapLoop -> Stm
mapLoopStm MapLoop
maploop) DistAcc GPU
acc
  | Bool
otherwise =
    DistAcc GPU
-> Stm
-> DistNestT
     GPU
     DistribM
     (Maybe (PostStms GPU, Result, KernelNest, DistAcc GPU))
forall (m :: * -> *) rep.
(MonadFreshNames m, LocalScope rep m, DistRep rep) =>
DistAcc rep
-> Stm
-> DistNestT
     rep m (Maybe (PostStms rep, Result, KernelNest, DistAcc rep))
distributeSingleStm DistAcc GPU
acc (MapLoop -> Stm
mapLoopStm MapLoop
maploop) DistNestT
  GPU
  DistribM
  (Maybe (PostStms GPU, Result, KernelNest, DistAcc GPU))
-> (Maybe (PostStms GPU, Result, KernelNest, DistAcc GPU)
    -> DistNestT GPU DistribM (DistAcc GPU))
-> DistNestT GPU DistribM (DistAcc GPU)
forall (m :: * -> *) a b. Monad m => m a -> (a -> m b) -> m b
>>= \case
      Just (PostStms GPU
post_kernels, Result
res, KernelNest
nest, DistAcc GPU
acc')
        | Just ([Int]
perm, [PatElemT Type]
_pat_unused) <- PatT Type -> Result -> Maybe ([Int], [PatElemT Type])
permutationAndMissing PatT Type
Pat SOACS
pat Result
res -> do
          PostStms GPU -> DistNestT GPU DistribM ()
forall (m :: * -> *) rep.
Monad m =>
PostStms rep -> DistNestT rep m ()
addPostStms PostStms GPU
post_kernels
          [Int]
-> KernelNest
-> DistAcc GPU
-> DistNestT GPU DistribM (DistAcc GPU)
multiVersion [Int]
perm KernelNest
nest DistAcc GPU
acc'
      Maybe (PostStms GPU, Result, KernelNest, DistAcc GPU)
_ -> MapLoop -> DistAcc GPU -> DistNestT GPU DistribM (DistAcc GPU)
forall (m :: * -> *) rep.
(MonadFreshNames m, LocalScope rep m, DistRep rep) =>
MapLoop -> DistAcc rep -> DistNestT rep m (DistAcc rep)
distributeMap MapLoop
maploop DistAcc GPU
acc
  where
    discardTargets :: DistAcc rep -> DistAcc rep
discardTargets DistAcc rep
acc' =
      -- FIXME: work around bogus targets.
      DistAcc rep
acc' {distTargets :: Targets
distTargets = Target -> Targets
singleTarget (PatT Type
forall a. Monoid a => a
mempty, Result
forall a. Monoid a => a
mempty)}

    multiVersion :: [Int]
-> KernelNest
-> DistAcc GPU
-> DistNestT GPU DistribM (DistAcc GPU)
multiVersion [Int]
perm KernelNest
nest DistAcc GPU
acc' = do
      -- The kernel can be distributed by itself, so now we can
      -- decide whether to just sequentialise, or exploit inner
      -- parallelism.
      DistEnv GPU DistribM
dist_env <- DistNestT GPU DistribM (DistEnv GPU DistribM)
forall r (m :: * -> *). MonadReader r m => m r
ask
      let extra_scope :: Scope GPU
extra_scope = Targets -> Scope GPU
forall rep. DistRep rep => Targets -> Scope rep
targetsScope (Targets -> Scope GPU) -> Targets -> Scope GPU
forall a b. (a -> b) -> a -> b
$ DistAcc GPU -> Targets
forall rep. DistAcc rep -> Targets
distTargets DistAcc GPU
acc'

      GPUStms
stms <- DistribM GPUStms -> DistNestT GPU DistribM GPUStms
forall rep (m :: * -> *) a.
(LocalScope rep m, DistRep rep) =>
m a -> DistNestT rep m a
liftInner (DistribM GPUStms -> DistNestT GPU DistribM GPUStms)
-> DistribM GPUStms -> DistNestT GPU DistribM GPUStms
forall a b. (a -> b) -> a -> b
$
        Scope GPU -> DistribM GPUStms -> DistribM GPUStms
forall rep (m :: * -> *) a.
LocalScope rep m =>
Scope rep -> m a -> m a
localScope Scope GPU
extra_scope (DistribM GPUStms -> DistribM GPUStms)
-> DistribM GPUStms -> DistribM GPUStms
forall a b. (a -> b) -> a -> b
$ do
          let maploop' :: MapLoop
maploop' = Pat SOACS -> StmAux () -> SubExp -> Lambda -> [VName] -> MapLoop
MapLoop Pat SOACS
pat StmAux ()
aux SubExp
w Lambda
lam [VName]
arrs

              exploitInnerParallelism :: KernelPath -> DistribM GPUStms
exploitInnerParallelism KernelPath
path' = do
                let dist_env' :: DistEnv GPU DistribM
dist_env' =
                      DistEnv GPU DistribM
dist_env
                        { distOnTopLevelStms :: Stms SOACS -> DistNestT GPU DistribM GPUStms
distOnTopLevelStms = KernelPath -> Stms SOACS -> DistNestT GPU DistribM GPUStms
onTopLevelStms KernelPath
path',
                          distOnInnerMap :: MapLoop -> DistAcc GPU -> DistNestT GPU DistribM (DistAcc GPU)
distOnInnerMap = KernelPath
-> MapLoop -> DistAcc GPU -> DistNestT GPU DistribM (DistAcc GPU)
onInnerMap KernelPath
path'
                        }
                DistEnv GPU DistribM
-> DistNestT GPU DistribM (DistAcc GPU) -> DistribM GPUStms
forall (m :: * -> *) rep.
(MonadLogger m, DistRep rep) =>
DistEnv rep m -> DistNestT rep m (DistAcc rep) -> m (Stms rep)
runDistNestT DistEnv GPU DistribM
dist_env' (DistNestT GPU DistribM (DistAcc GPU) -> DistribM GPUStms)
-> DistNestT GPU DistribM (DistAcc GPU) -> DistribM GPUStms
forall a b. (a -> b) -> a -> b
$
                  KernelNest
-> DistNestT GPU DistribM (DistAcc GPU)
-> DistNestT GPU DistribM (DistAcc GPU)
forall (m :: * -> *) rep a.
(Monad m, DistRep rep) =>
KernelNest -> DistNestT rep m a -> DistNestT rep m a
inNesting KernelNest
nest (DistNestT GPU DistribM (DistAcc GPU)
 -> DistNestT GPU DistribM (DistAcc GPU))
-> DistNestT GPU DistribM (DistAcc GPU)
-> DistNestT GPU DistribM (DistAcc GPU)
forall a b. (a -> b) -> a -> b
$
                    Scope GPU
-> DistNestT GPU DistribM (DistAcc GPU)
-> DistNestT GPU DistribM (DistAcc GPU)
forall rep (m :: * -> *) a.
LocalScope rep m =>
Scope rep -> m a -> m a
localScope Scope GPU
extra_scope (DistNestT GPU DistribM (DistAcc GPU)
 -> DistNestT GPU DistribM (DistAcc GPU))
-> DistNestT GPU DistribM (DistAcc GPU)
-> DistNestT GPU DistribM (DistAcc GPU)
forall a b. (a -> b) -> a -> b
$
                      DistAcc GPU -> DistAcc GPU
forall rep. DistAcc rep -> DistAcc rep
discardTargets (DistAcc GPU -> DistAcc GPU)
-> DistNestT GPU DistribM (DistAcc GPU)
-> DistNestT GPU DistribM (DistAcc GPU)
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> MapLoop -> DistAcc GPU -> DistNestT GPU DistribM (DistAcc GPU)
forall (m :: * -> *) rep.
(MonadFreshNames m, LocalScope rep m, DistRep rep) =>
MapLoop -> DistAcc rep -> DistNestT rep m (DistAcc rep)
distributeMap MapLoop
maploop' DistAcc GPU
acc {distStms :: GPUStms
distStms = GPUStms
forall a. Monoid a => a
mempty}

          -- Normally the permutation is for the output pattern, but
          -- we can't really change that, so we change the result
          -- order instead.
          let lam_res' :: Result
lam_res' =
                [Int] -> Result -> Result
forall a. [Int] -> [a] -> [a]
rearrangeShape ([Int] -> [Int]
rearrangeInverse [Int]
perm) (Result -> Result) -> Result -> Result
forall a b. (a -> b) -> a -> b
$
                  BodyT SOACS -> Result
forall rep. BodyT rep -> Result
bodyResult (BodyT SOACS -> Result) -> BodyT SOACS -> Result
forall a b. (a -> b) -> a -> b
$ Lambda -> BodyT SOACS
forall rep. LambdaT rep -> BodyT rep
lambdaBody Lambda
lam
              lam' :: Lambda
lam' = Lambda
lam {lambdaBody :: BodyT SOACS
lambdaBody = (Lambda -> BodyT SOACS
forall rep. LambdaT rep -> BodyT rep
lambdaBody Lambda
lam) {bodyResult :: Result
bodyResult = Result
lam_res'}}
              map_nesting :: LoopNesting
map_nesting = PatT Type
-> StmAux () -> SubExp -> [(Param Type, VName)] -> LoopNesting
MapNesting PatT Type
Pat SOACS
pat StmAux ()
aux SubExp
w ([(Param Type, VName)] -> LoopNesting)
-> [(Param Type, VName)] -> LoopNesting
forall a b. (a -> b) -> a -> b
$ [Param Type] -> [VName] -> [(Param Type, VName)]
forall a b. [a] -> [b] -> [(a, b)]
zip (Lambda -> [LParam SOACS]
forall rep. LambdaT rep -> [LParam rep]
lambdaParams Lambda
lam) [VName]
arrs
              nest' :: KernelNest
nest' = Target -> LoopNesting -> KernelNest -> KernelNest
pushInnerKernelNesting (PatT Type
Pat SOACS
pat, Result
lam_res') LoopNesting
map_nesting KernelNest
nest

          -- XXX: we do not construct a new KernelPath when
          -- sequentialising.  This is only OK as long as further
          -- versioning does not take place down that branch (it currently
          -- does not).
          (Stm GPU
sequentialised_kernel, GPUStms
nestw_stms) <- Scope GPU
-> DistribM (Stm GPU, GPUStms) -> DistribM (Stm GPU, GPUStms)
forall rep (m :: * -> *) a.
LocalScope rep m =>
Scope rep -> m a -> m a
localScope Scope GPU
extra_scope (DistribM (Stm GPU, GPUStms) -> DistribM (Stm GPU, GPUStms))
-> DistribM (Stm GPU, GPUStms) -> DistribM (Stm GPU, GPUStms)
forall a b. (a -> b) -> a -> b
$ do
            let sequentialised_lam :: Lambda GPU
sequentialised_lam = Lambda -> Lambda GPU
soacsLambdaToGPU Lambda
lam'
            MkSegLevel GPU DistribM
-> KernelNest -> Body GPU -> DistribM (Stm GPU, GPUStms)
forall rep (m :: * -> *).
(DistRep rep, MonadFreshNames m, LocalScope rep m) =>
MkSegLevel rep m -> KernelNest -> Body rep -> m (Stm rep, Stms rep)
constructKernel MkSegLevel GPU DistribM
forall (m :: * -> *). MonadFreshNames m => MkSegLevel GPU m
segThreadCapped KernelNest
nest' (Body GPU -> DistribM (Stm GPU, GPUStms))
-> Body GPU -> DistribM (Stm GPU, GPUStms)
forall a b. (a -> b) -> a -> b
$ Lambda GPU -> Body GPU
forall rep. LambdaT rep -> BodyT rep
lambdaBody Lambda GPU
sequentialised_lam

          let outer_pat :: PatT Type
outer_pat = LoopNesting -> PatT Type
loopNestingPat (LoopNesting -> PatT Type) -> LoopNesting -> PatT Type
forall a b. (a -> b) -> a -> b
$ KernelNest -> LoopNesting
forall a b. (a, b) -> a
fst KernelNest
nest
          (GPUStms
nestw_stms GPUStms -> GPUStms -> GPUStms
forall a. Semigroup a => a -> a -> a
<>)
            (GPUStms -> GPUStms) -> DistribM GPUStms -> DistribM GPUStms
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> KernelNest
-> KernelPath
-> (KernelPath -> DistribM GPUStms)
-> (KernelPath -> DistribM GPUStms)
-> Pat SOACS
-> Lambda
-> DistribM GPUStms
onMap'
              KernelNest
nest'
              KernelPath
path
              (DistribM GPUStms -> KernelPath -> DistribM GPUStms
forall a b. a -> b -> a
const (DistribM GPUStms -> KernelPath -> DistribM GPUStms)
-> DistribM GPUStms -> KernelPath -> DistribM GPUStms
forall a b. (a -> b) -> a -> b
$ GPUStms -> DistribM GPUStms
forall (m :: * -> *) a. Monad m => a -> m a
return (GPUStms -> DistribM GPUStms) -> GPUStms -> DistribM GPUStms
forall a b. (a -> b) -> a -> b
$ Stm GPU -> GPUStms
forall rep. Stm rep -> Stms rep
oneStm Stm GPU
sequentialised_kernel)
              KernelPath -> DistribM GPUStms
exploitInnerParallelism
              PatT Type
Pat SOACS
outer_pat
              Lambda
lam'

      GPUStms -> DistNestT GPU DistribM ()
forall (m :: * -> *) rep. Monad m => Stms rep -> DistNestT rep m ()
postStm GPUStms
stms
      DistAcc GPU -> DistNestT GPU DistribM (DistAcc GPU)
forall (m :: * -> *) a. Monad m => a -> m a
return DistAcc GPU
acc'