Xcode playground code for benchmarking a Swifty implementation vs. vDSP.

vDSPBenchmark.swift

import Accelerate
import XCTest

let array = Array(stride(from: 0.0, to: 50000.0, by: 1))
let array2 = Array(stride(from: 0.0, to: 50000.0, by: 1))
let array3 = Array(stride(from: 0.0, to: 50000.0, by: 1))

class MathTests: XCTestCase {
    func testMeanSwifty() {
        measure {
            let _ = array.reduce(0.0, +) / Double(array.count)
        }
    }
    
    func testMeanvDSP() {
        measure {
            let _ = vDSP.mean(array)
        }
    }
    
    func testPowSwifty() {
        measure {
            let _ = array.map { pow($0, 2) }
        }
    }
    
    func testPowvDSP() {
        measure {
            let _ = vDSP.multiply(array, array)
        }
    }
    
    func testSumMultSwifty() {
        measure {
            let _ = array.enumerated().map { ($0.element + array2[$0.offset]) * array3[$0.offset] }
        }
    }
    
    func testSumMultvDSP() {
        measure {
            let _ = vDSP.multiply(addition: (array, array2), array3)
        }
    }
}

MathTests.defaultTestSuite.run()