42 lines
1.6 KiB
Swift
42 lines
1.6 KiB
Swift
//===----------------------------------------------------------------------===//
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//
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// This source file is part of the SwiftNIO open source project
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//
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// Copyright (c) 2017-2018 Apple Inc. and the SwiftNIO project authors
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// Licensed under Apache License v2.0
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//
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// See LICENSE.txt for license information
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// See CONTRIBUTORS.txt for the list of SwiftNIO project authors
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//
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// SPDX-License-Identifier: Apache-2.0
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//
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//===----------------------------------------------------------------------===//
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// MARK: Rebasing shims
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// These methods are shimmed in to NIO until https://github.com/apple/swift/pull/34879 is resolved.
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// They address the fact that the current rebasing initializers are surprisingly expensive and do excessive
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// checked arithmetic. This expense forces them to often be outlined, reducing the ability to optimise out
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// further preconditions and branches.
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extension UnsafeRawBufferPointer {
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@inlinable
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init(fastRebase slice: Slice<UnsafeRawBufferPointer>) {
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let base = slice.base.baseAddress?.advanced(by: slice.startIndex)
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self.init(start: base, count: slice.endIndex &- slice.startIndex)
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}
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@inlinable
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init(fastRebase slice: Slice<UnsafeMutableRawBufferPointer>) {
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let base = slice.base.baseAddress?.advanced(by: slice.startIndex)
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self.init(start: base, count: slice.endIndex &- slice.startIndex)
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}
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}
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extension UnsafeMutableRawBufferPointer {
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@inlinable
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init(fastRebase slice: Slice<UnsafeMutableRawBufferPointer>) {
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let base = slice.base.baseAddress?.advanced(by: slice.startIndex)
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self.init(start: base, count: slice.endIndex &- slice.startIndex)
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}
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}
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