| //===--- Fibonacci.swift --------------------------------------------------===// |
| // |
| // This source file is part of the Swift.org open source project |
| // |
| // Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors |
| // Licensed under Apache License v2.0 with Runtime Library Exception |
| // |
| // See https://swift.org/LICENSE.txt for license information |
| // See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors |
| // |
| //===----------------------------------------------------------------------===// |
| |
| import TestsUtils |
| |
| public let Fibonacci = BenchmarkInfo( |
| name: "Fibonacci", |
| runFunction: run_Fibonacci, |
| tags: [.unstable, .algorithm]) |
| |
| func fibonacci(_ n: Int) -> Int { |
| if (n < 2) { return 1 } |
| return fibonacci(n - 2) + fibonacci(n - 1) |
| } |
| |
| @inline(never) |
| func Fibonacci(_ n: Int) -> Int { |
| // This if prevents optimizer from computing return value of Fibonacci(32) |
| // at compile time. |
| if False() { return 0 } |
| |
| if (n < 2) { return 1 } |
| return fibonacci(n - 2) + fibonacci(n - 1) |
| } |
| |
| @inline(never) |
| public func run_Fibonacci(_ N: Int) { |
| let n = 32 |
| let ref_result = 3524578 |
| var result = 0 |
| for _ in 1...N { |
| result = Fibonacci(n) |
| if result != ref_result { |
| break |
| } |
| } |
| CheckResults(result == ref_result) |
| } |
