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.DS_Store | ||
/.build | ||
/Packages | ||
/*.xcodeproj | ||
xcuserdata/ | ||
*.xcworkspacedata |
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MIT License | ||
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Copyright (c) 2020 Brandon Asuncion | ||
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Permission is hereby granted, free of charge, to any person obtaining a copy | ||
of this software and associated documentation files (the "Software"), to deal | ||
in the Software without restriction, including without limitation the rights | ||
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
copies of the Software, and to permit persons to whom the Software is | ||
furnished to do so, subject to the following conditions: | ||
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The above copyright notice and this permission notice shall be included in all | ||
copies or substantial portions of the Software. | ||
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | ||
SOFTWARE. |
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// swift-tools-version:5.2 | ||
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import PackageDescription | ||
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let package = Package( | ||
name: "SwissTable", | ||
platforms: [ | ||
.macOS(.v10_15) | ||
], | ||
products: [ | ||
.library( | ||
name: "SwissTable", | ||
targets: ["SwissTable"]), | ||
], | ||
dependencies: [ | ||
], | ||
targets: [ | ||
.target( | ||
name: "SwissTable", | ||
dependencies: [], | ||
swiftSettings: [ | ||
.unsafeFlags(["-Xcc", "-mavx2"]), | ||
] | ||
), | ||
.testTarget( | ||
name: "SwissTableTests", | ||
dependencies: ["SwissTable"]), | ||
] | ||
) |
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# Swiss Table | ||
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A [SIMD-accelerated](https://en.wikipedia.org/wiki/SIMD) hash table implementation in Swift based off of [Google's Abseil](https://abseil.io/about/design/swisstables) and [Rust's Hashbrown](https://github.com/rust-lang/hashbrown/) that utilizes the AVX2 instruction set to perform fast read/write performance. | ||
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Work in progress. | ||
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## License | ||
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[MIT License](https://choosealicense.com/licenses/mit/) |
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extension FixedWidthInteger { | ||
@inlinable | ||
var isPowerOf2: Bool { | ||
assert(self >= 0) | ||
return self & (self &- 1) == 0 | ||
} | ||
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@inlinable | ||
func nextPowerOf2() -> Self { | ||
assert(self >= 0) | ||
return 1 &<< (Self.bitWidth &- (self &- 1).leadingZeroBitCount) | ||
} | ||
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@inlinable | ||
func prevPowerOf2() -> Self { | ||
assert(self >= 0) | ||
return nextPowerOf2() &>> 1 | ||
} | ||
} | ||
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extension FixedWidthInteger { | ||
@inlinable | ||
func reduce(_ N: Self) -> Self { | ||
self.multipliedFullWidth(by: N).high | ||
} | ||
} | ||
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extension FixedWidthInteger where Self: SignedInteger { | ||
@_transparent | ||
@inlinable | ||
func alignedUp(to alignment: Self) -> Self { | ||
assert(alignment > 0 && alignment.isPowerOf2) | ||
return (self &+ alignment &- 1) & -alignment | ||
} | ||
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@_transparent | ||
@inlinable | ||
func alignedUp<T>(to: T.Type) -> Self { | ||
return self.alignedUp(to: Self(MemoryLayout<T>.alignment)) | ||
} | ||
} | ||
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extension Int { | ||
@inlinable | ||
func murmur64() -> Int { | ||
var h = UInt(bitPattern: self) | ||
h ^= h &>> 47 | ||
h &*= 0xc6a4a7935bd1e995 | ||
h ^= h &>> 47 | ||
return Int(bitPattern: h) | ||
} | ||
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@inlinable | ||
func fnv1a() -> Int { | ||
var h: UInt64 = 0xcbf29ce484222325 | ||
for shift in stride(from: 0, to: 64, by: 8) { | ||
h ^= UInt64(truncatingIfNeeded: (self &>> shift) & 0xff) | ||
h &*= 0x100000001b3 | ||
} | ||
return Int(Int64(bitPattern: h)) | ||
} | ||
} |
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extension SwissTable: Sequence { | ||
public typealias Element = (key: Key, value: Value) | ||
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public struct Iterator: IteratorProtocol { | ||
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@inlinable | ||
internal init(table: SwissTable<Key, Value>) { | ||
self.table = table | ||
self.iterator = table.control.enumerated().makeIterator() | ||
} | ||
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@usableFromInline | ||
internal let table: SwissTable | ||
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@usableFromInline | ||
internal var iterator: EnumeratedSequence<UnsafeMutableBufferPointer<Int8>>.Iterator | ||
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@inlinable | ||
public mutating func next() -> (key: Key, value: Value)? { | ||
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// TODO: Manually vectorize this loop | ||
while let (index, control) = iterator.next() { | ||
if control != -1 { | ||
let entry = table.entries[index] | ||
return (key: entry.key, value: entry.value) | ||
} | ||
} | ||
return nil | ||
} | ||
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} | ||
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@inlinable | ||
public func makeIterator() -> Iterator { | ||
Iterator(table: self) | ||
} | ||
} | ||
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extension SwissTable: Equatable where Value: Equatable { | ||
public static func == (lhs: SwissTable<Key, Value>, rhs: SwissTable<Key, Value>) -> Bool { | ||
// TODO: Implement | ||
false | ||
} | ||
} | ||
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extension SwissTable: Hashable where Value: Hashable { | ||
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// same as Swift's stdlib | ||
public func hash(into hasher: inout Hasher) { | ||
var result = 0 | ||
for (k, v) in self { | ||
var elementHasher = hasher | ||
elementHasher.combine(k) | ||
elementHasher.combine(v) | ||
result ^= elementHasher.finalize() | ||
} | ||
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hasher.combine(result) | ||
} | ||
} | ||
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extension SwissTable: ExpressibleByDictionaryLiteral { | ||
public init(dictionaryLiteral elements: (Key, Value)...) { | ||
self.init(minimumCapacity: elements.count &* 2) | ||
for (key, value) in elements { | ||
self[key] = value | ||
} | ||
} | ||
} | ||
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extension SwissTable { | ||
public init<S>(uniqueKeysWithValues keysAndValues: S) where S : Sequence, S.Element == (Key, Value) { | ||
self.init(minimumCapacity: keysAndValues.underestimatedCount &* 2) | ||
for (key, value) in keysAndValues { | ||
self[key] = value | ||
} | ||
} | ||
} |
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import struct SwiftShims.HeapObject | ||
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extension SwissTable { | ||
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/// A reference-counted buffer for storing control bytes and table entries in a singlular heap allocation | ||
@usableFromInline | ||
@_fixed_layout | ||
@_objc_non_lazy_realization | ||
final class Storage: Swift.ManagedBuffer<Storage.Header, Int8> { | ||
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@inlinable | ||
@inline(__always) | ||
var size: Int { | ||
header.size | ||
} | ||
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@inlinable | ||
deinit { | ||
controlBytes.baseAddress!.deinitialize(count: size) | ||
entries.baseAddress!.deinitialize(count: size) | ||
} | ||
} | ||
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@inlinable | ||
static func allocateUninitializedStorage(size: Int) -> Storage { | ||
var bufferSize = size.alignedUp(to: Storage.Entry.self) | ||
bufferSize += MemoryLayout<Storage.Entry>.stride &* size | ||
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return Storage.create(minimumCapacity: bufferSize) { buffer in | ||
Storage.Header(size: size) | ||
} as! Storage | ||
} | ||
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@inlinable | ||
static func allocateStorage(size: Int) -> Storage { | ||
let buffer = allocateUninitializedStorage(size: size) | ||
buffer.rawBody.initializeMemory(as: Int8.self, repeating: -1) | ||
return buffer | ||
} | ||
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@inlinable | ||
static func copyStorage(source: Storage, newSize size: Int) -> Storage { | ||
assert(size >= source.size) | ||
let buffer = allocateUninitializedStorage(size: size) | ||
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let sourcePointer = source.rawBody.baseAddress!.assumingMemoryBound(to: Int8.self) | ||
let destPointer = buffer.rawBody.baseAddress! | ||
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destPointer.moveInitializeMemory( | ||
as: Int8.self, | ||
from: sourcePointer, | ||
count: source.bodyByteSize | ||
) | ||
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let growth = size - source.size | ||
let uninitialized = destPointer.assumingMemoryBound(to: Int8.self) + source.bodyByteSize | ||
uninitialized.initialize(repeating: -1, count: growth) | ||
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return buffer | ||
} | ||
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} | ||
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extension SwissTable.Storage { | ||
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@frozen | ||
@usableFromInline | ||
struct Header { | ||
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@usableFromInline | ||
let size: Int | ||
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@inlinable | ||
init(size: Int) { | ||
self.size = size | ||
} | ||
} | ||
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@frozen | ||
@usableFromInline | ||
struct Entry { | ||
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@usableFromInline let hash: Int | ||
@usableFromInline let key: Key | ||
@usableFromInline let value: Value | ||
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@inlinable | ||
init(hash: Int, key: Key, value: Value) { | ||
self.hash = hash | ||
self.key = key | ||
self.value = value | ||
} | ||
} | ||
} | ||
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extension SwissTable.Storage { | ||
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// Using a manually allocated buffer would be cleaner, | ||
// but a ManagedBuffer is used for copy-on-write. | ||
// https://www.cocoawithlove.com/blog/2016/09/22/deque.html | ||
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@inlinable | ||
@inline(__always) | ||
var bodyByteSize: Int { | ||
size.alignedUp(to: MemoryLayout<Entry>.alignment) | ||
+ MemoryLayout<Entry>.stride &* size | ||
} | ||
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@inlinable | ||
@inline(__always) | ||
var rawBody: UnsafeMutableRawBufferPointer { | ||
self.withUnsafeMutablePointerToElements { (elements: UnsafeMutablePointer<Int8>) -> UnsafeMutableRawBufferPointer in | ||
UnsafeMutableRawBufferPointer(start: elements, count: bodyByteSize) | ||
} | ||
} | ||
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@inlinable | ||
@inline(__always) | ||
var controlBytes: UnsafeMutableBufferPointer<Int8> { | ||
var value = unsafeBitCast(self, to: Int.self) | ||
value &+= MemoryLayout<HeapObject>.size | ||
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value = value.alignedUp(to: Header.self) | ||
value &+= MemoryLayout<Header>.stride | ||
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let base = UnsafeMutablePointer<Int8>(bitPattern: value) | ||
return .init(start: base, count: self.size) | ||
} | ||
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@inlinable | ||
@inline(__always) | ||
var entries: UnsafeMutableBufferPointer<Entry> { | ||
var value = unsafeBitCast(self, to: Int.self) | ||
value &+= MemoryLayout<HeapObject>.size | ||
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value = value.alignedUp(to: Header.self) | ||
value &+= MemoryLayout<Header>.stride | ||
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// size of control bytes | ||
value &+= self.size | ||
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// align up to Entry alignment | ||
value = value.alignedUp(to: Entry.self) | ||
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let base = UnsafeMutablePointer<Entry>(bitPattern: value) | ||
return .init(start: base, count: self.size) | ||
} | ||
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} |
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