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Reduce allocations in some Array.Parallel funcs #17505

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Merged
merged 3 commits into from
Aug 9, 2024
Merged

Reduce allocations in some Array.Parallel funcs #17505

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Reduce allocations in some `Array.Parallel` funcs
brianrourkeboll Aug 7, 2024
0b1b32d
Need that
brianrourkeboll Aug 7, 2024
c8e6b2e
Merge branch 'main' of https://github.com/dotnet/fsharp into array-pa…
brianrourkeboll Aug 8, 2024
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24 changes: 15 additions & 9 deletions src/FSharp.Core/array.fs
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Original file line number Diff line number Diff line change
Expand Up @@ -2179,9 +2179,8 @@ module Array =
// Not exists $condition <==> (opposite of $condition is true forall)
exists (predicate >> not) array |> not

[<CompiledName("TryFindIndex")>]
let tryFindIndex predicate (array: _ array) =
checkNonNull "array" array
let inline tryFindIndexAux predicate (array: _ array) =
checkNonNull (nameof array) array

let pResult =
Parallel.For(
Expand All @@ -2192,16 +2191,24 @@ module Array =
pState.Break())
)

pResult.LowestBreakIteration |> Option.ofNullable |> Option.map int
pResult.LowestBreakIteration

[<CompiledName("TryFindIndex")>]
let tryFindIndex predicate (array: _ array) =
let i = tryFindIndexAux predicate array
if i.HasValue then Some (int (i.GetValueOrDefault()))
else None

[<CompiledName("TryFind")>]
let tryFind predicate (array: _ array) =
array |> tryFindIndex predicate |> Option.map (fun i -> array[i])
let i = tryFindIndexAux predicate array
if i.HasValue then Some array[int (i.GetValueOrDefault())]
else None

[<CompiledName("TryPick")>]
let tryPick chooser (array: _ array) =
checkNonNull "array" array
let allChosen = new System.Collections.Concurrent.ConcurrentDictionary<_, _>()
let allChosen = System.Collections.Concurrent.ConcurrentDictionary()

let pResult =
Parallel.For(
Expand All @@ -2215,9 +2222,8 @@ module Array =
pState.Break())
)

pResult.LowestBreakIteration
|> Option.ofNullable
|> Option.bind (fun i -> allChosen[int i])
if pResult.LowestBreakIteration.HasValue then allChosen[int (pResult.LowestBreakIteration.GetValueOrDefault())]
else None

[<CompiledName("Choose")>]
let choose chooser (array: 'T array) =
Expand Down
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