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8851bac1be
Add inlinability annotations to restore performance parity with 4.2 String. Take advantage of known NFC as a fast-path for comparison, and overhaul comparison dispatch. RRC improvements and optmizations.
96 lines
3.3 KiB
Swift
96 lines
3.3 KiB
Swift
//===----------------------------------------------------------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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import SwiftShims
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extension StringProtocol {
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@_specialize(where Self == String, R == String)
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@_specialize(where Self == String, R == Substring)
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@_specialize(where Self == Substring, R == String)
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@_specialize(where Self == Substring, R == Substring)
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@_effects(readonly)
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public static func == <R: StringProtocol>(lhs: Self, rhs: R) -> Bool {
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return lhs._slicedGuts.compare(with: rhs._slicedGuts) == .equal
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}
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@inlinable @inline(__always) // forward to other operator
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@_effects(readonly)
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public static func != <R: StringProtocol>(lhs: Self, rhs: R) -> Bool {
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return !(lhs == rhs)
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}
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@_specialize(where Self == String, R == String)
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@_specialize(where Self == String, R == Substring)
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@_specialize(where Self == Substring, R == String)
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@_specialize(where Self == Substring, R == Substring)
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@_effects(readonly)
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public static func < <R: StringProtocol>(lhs: Self, rhs: R) -> Bool {
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return lhs._slicedGuts.compare(with: rhs._slicedGuts) == .less
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}
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@inlinable @inline(__always) // forward to other operator
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@_effects(readonly)
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public static func > <R: StringProtocol>(lhs: Self, rhs: R) -> Bool {
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return rhs < lhs
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}
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@inlinable @inline(__always) // forward to other operator
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@_effects(readonly)
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public static func <= <R: StringProtocol>(lhs: Self, rhs: R) -> Bool {
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return !(rhs < lhs)
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}
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@inlinable @inline(__always) // forward to other operator
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@_effects(readonly)
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public static func >= <R: StringProtocol>(lhs: Self, rhs: R) -> Bool {
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return !(lhs < rhs)
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}
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}
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extension String : Equatable {
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@inlinable @inline(__always) // For the bitwise comparision
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@_effects(readonly)
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public static func == (lhs: String, rhs: String) -> Bool {
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if lhs._guts.rawBits == rhs._guts.rawBits { return true }
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if _fastPath(lhs._guts.isNFCFastUTF8 && rhs._guts.isNFCFastUTF8) {
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Builtin.onFastPath() // aggressively inline / optimize
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return lhs._guts.withFastUTF8 { nfcSelf in
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return rhs._guts.withFastUTF8 { nfcOther in
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return _binaryCompare(nfcSelf, nfcOther) == 0
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}
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}
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}
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return lhs._slicedGuts.compare(with: rhs._slicedGuts) == .equal
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}
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}
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extension String : Comparable {
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@inlinable @inline(__always) // For the bitwise comparision
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@_effects(readonly)
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public static func < (lhs: String, rhs: String) -> Bool {
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if lhs._guts.rawBits == rhs._guts.rawBits { return false }
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if _fastPath(lhs._guts.isNFCFastUTF8 && rhs._guts.isNFCFastUTF8) {
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Builtin.onFastPath() // aggressively inline / optimize
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return lhs._guts.withFastUTF8 { nfcSelf in
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return rhs._guts.withFastUTF8 { nfcOther in
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return _binaryCompare(nfcSelf, nfcOther) < 0
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}
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}
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}
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return lhs._slicedGuts.compare(with: rhs._slicedGuts) == .less
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}
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}
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extension Substring : Equatable {}
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