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75 lines
2.0 KiB
Swift
75 lines
2.0 KiB
Swift
//===--- TestsUtils.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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#if os(Linux)
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import Glibc
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#else
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import Darwin
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#endif
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// Linear function shift register.
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//
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// This is just to drive benchmarks. I don't make any claim about its
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// strength. According to Wikipedia, it has the maximal period for a
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// 32-bit register.
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struct LFSR {
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// Set the register to some seed that I pulled out of a hat.
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var lfsr : UInt32 = 0xb78978e7
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mutating func shift() {
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lfsr = (lfsr >> 1) ^ (UInt32(bitPattern: -Int32((lfsr & 1))) & 0xD0000001)
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}
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mutating func randInt() -> Int64 {
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var result : UInt32 = 0
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for _ in 0..<32 {
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result = (result << 1) | (lfsr & 1)
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shift()
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}
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return Int64(bitPattern: UInt64(result))
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}
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}
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var lfsrRandomGenerator = LFSR()
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// Start the generator from the beginning
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public func SRand() {
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lfsrRandomGenerator = LFSR()
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}
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public func Random() -> Int64 {
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return lfsrRandomGenerator.randInt()
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}
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public func CheckResults(_ resultsMatch: Bool, _ message: @autoclosure () -> String) {
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guard resultsMatch else {
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print(message())
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abort()
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}
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}
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public func False() -> Bool { return false }
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/// This is a dummy protocol to test the speed of our protocol dispatch.
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public protocol SomeProtocol { func getValue() -> Int }
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struct MyStruct : SomeProtocol {
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init() {}
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func getValue() -> Int { return 1 }
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}
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public func someProtocolFactory() -> SomeProtocol { return MyStruct() }
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// Just consume the argument.
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// It's important that this function is in a another module than the tests
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// which are using it.
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public func blackHole<T>(_ x: T) {
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}
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