{-# LANGUAGE OverloadedStrings   #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TypeApplications    #-}
-- |
-- Module      : Data.Array.Accelerate.LLVM.Native.CodeGen.Generate
-- Copyright   : [2014..2020] The Accelerate Team
-- License     : BSD3
--
-- Maintainer  : Trevor L. McDonell <trevor.mcdonell@gmail.com>
-- Stability   : experimental
-- Portability : non-portable (GHC extensions)
--

module Data.Array.Accelerate.LLVM.Native.CodeGen.Generate
  where

import Data.Array.Accelerate.Representation.Array
import Data.Array.Accelerate.Type

import Data.Array.Accelerate.LLVM.CodeGen.Array
import Data.Array.Accelerate.LLVM.CodeGen.Base
import Data.Array.Accelerate.LLVM.CodeGen.Environment
import Data.Array.Accelerate.LLVM.CodeGen.Monad
import Data.Array.Accelerate.LLVM.CodeGen.Sugar
import Data.Array.Accelerate.LLVM.Compile.Cache

import Data.Array.Accelerate.LLVM.Native.Target                 ( Native )
import Data.Array.Accelerate.LLVM.Native.CodeGen.Base
import Data.Array.Accelerate.LLVM.Native.CodeGen.Loop


-- Construct a new array by applying a function to each index. Each thread
-- processes multiple adjacent elements.
--
mkGenerate
    :: UID
    -> Gamma aenv
    -> ArrayR (Array sh e)
    -> IRFun1  Native aenv (sh -> e)
    -> CodeGen Native      (IROpenAcc Native aenv (Array sh e))
mkGenerate :: UID
-> Gamma aenv
-> ArrayR (Array sh e)
-> IRFun1 Native aenv (sh -> e)
-> CodeGen Native (IROpenAcc Native aenv (Array sh e))
mkGenerate UID
uid Gamma aenv
aenv ArrayR (Array sh e)
repr IRFun1 Native aenv (sh -> e)
apply =
  let
      (Operands sh
start, Operands sh
end, [Parameter]
paramGang)   = ShapeR sh -> (Operands sh, Operands sh, [Parameter])
forall sh. ShapeR sh -> (Operands sh, Operands sh, [Parameter])
gangParam (ArrayR (Array sh e) -> ShapeR sh
forall sh e. ArrayR (Array sh e) -> ShapeR sh
arrayRshape ArrayR (Array sh e)
repr)
      (IRArray (Array sh e)
arrOut, [Parameter]
paramOut)        = ArrayR (Array sh e)
-> Name (Array sh e) -> (IRArray (Array sh e), [Parameter])
forall sh e.
ArrayR (Array sh e)
-> Name (Array sh e) -> (IRArray (Array sh e), [Parameter])
mutableArray ArrayR (Array sh e)
repr Name (Array sh e)
"out"
      paramEnv :: [Parameter]
paramEnv                  = Gamma aenv -> [Parameter]
forall aenv. Gamma aenv -> [Parameter]
envParam Gamma aenv
aenv
      shOut :: Operands sh
shOut                     = IRArray (Array sh e) -> Operands sh
forall sh e. IRArray (Array sh e) -> Operands sh
irArrayShape IRArray (Array sh e)
arrOut
  in
  UID
-> Label
-> [Parameter]
-> CodeGen Native ()
-> CodeGen Native (IROpenAcc Native aenv (Array sh e))
forall aenv a.
UID
-> Label
-> [Parameter]
-> CodeGen Native ()
-> CodeGen Native (IROpenAcc Native aenv a)
makeOpenAcc UID
uid Label
"generate" ([Parameter]
paramGang [Parameter] -> [Parameter] -> [Parameter]
forall a. [a] -> [a] -> [a]
++ [Parameter]
paramOut [Parameter] -> [Parameter] -> [Parameter]
forall a. [a] -> [a] -> [a]
++ [Parameter]
paramEnv) (CodeGen Native ()
 -> CodeGen Native (IROpenAcc Native aenv (Array sh e)))
-> CodeGen Native ()
-> CodeGen Native (IROpenAcc Native aenv (Array sh e))
forall a b. (a -> b) -> a -> b
$ do

    ShapeR sh
-> Operands sh
-> Operands sh
-> Operands sh
-> (Operands sh -> Operands Int -> CodeGen Native ())
-> CodeGen Native ()
forall sh.
ShapeR sh
-> Operands sh
-> Operands sh
-> Operands sh
-> (Operands sh -> Operands Int -> CodeGen Native ())
-> CodeGen Native ()
imapNestFromTo (ArrayR (Array sh e) -> ShapeR sh
forall sh e. ArrayR (Array sh e) -> ShapeR sh
arrayRshape ArrayR (Array sh e)
repr) Operands sh
start Operands sh
end Operands sh
shOut ((Operands sh -> Operands Int -> CodeGen Native ())
 -> CodeGen Native ())
-> (Operands sh -> Operands Int -> CodeGen Native ())
-> CodeGen Native ()
forall a b. (a -> b) -> a -> b
$ \Operands sh
ix Operands Int
i -> do
      Operands e
r <- IRFun1 Native aenv (sh -> e)
-> Operands sh -> IROpenExp Native ((), sh) aenv e
forall arch env aenv a b.
IROpenFun1 arch env aenv (a -> b)
-> Operands a -> IROpenExp arch (env, a) aenv b
app1 IRFun1 Native aenv (sh -> e)
apply Operands sh
ix                        -- apply generator function
      IntegralType Int
-> IRArray (Array sh e)
-> Operands Int
-> Operands e
-> CodeGen Native ()
forall int sh e arch.
IntegralType int
-> IRArray (Array sh e)
-> Operands int
-> Operands e
-> CodeGen arch ()
writeArray IntegralType Int
TypeInt IRArray (Array sh e)
arrOut Operands Int
i Operands e
r             -- store result

    CodeGen Native ()
forall arch. HasCallStack => CodeGen arch ()
return_