| //===--- ArraySubscript.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 |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // This test checks the performance of modifying an array element. |
| import TestsUtils |
| |
| public let ArraySubscript = BenchmarkInfo( |
| name: "ArraySubscript", |
| runFunction: run_ArraySubscript, |
| tags: [.validation, .api, .Array]) |
| |
| @inline(never) |
| public func run_ArraySubscript(_ N: Int) { |
| SRand() |
| |
| let numArrays = 200*N |
| let numArrayElements = 100 |
| |
| func bound(_ x: Int) -> Int { return min(x, numArrayElements-1) } |
| |
| var arrays = [[Int]](repeating: [], count: numArrays) |
| for i in 0..<numArrays { |
| for _ in 0..<numArrayElements { |
| arrays[i].append(Int(truncatingBitPattern: Random())) |
| } |
| } |
| |
| // Do a max up the diagonal. |
| for i in 1..<numArrays { |
| arrays[i][bound(i)] = |
| max(arrays[i-1][bound(i-1)], arrays[i][bound(i)]) |
| } |
| CheckResults(arrays[0][0] <= arrays[numArrays-1][bound(numArrays-1)]) |
| } |
