Method literal performance

demo.swift

import QuartzCore

var a = 1
func methodParams(file: String = #file, fun: String = #function, line: UInt = #line) -> Int {
    a += 1
    return a
}

func method() -> Int {
    a += 1
    return a
}

let startTimeParams = CACurrentMediaTime()
for _ in 1 ..< 1000000 {
    _ = methodParams()
}
let endTimeParams = CACurrentMediaTime()
print("With params: \(endTimeParams - startTimeParams)")

let startTime = CACurrentMediaTime()
for _ in 1 ..< 1000000 {
    _ = method()
}
let endTime = CACurrentMediaTime()
print("Without params: \(endTime - startTime)")

demo % swiftc -Onone demo.swift
demo % ./demo
With params: 0.0113304090000383
Without params: 0.00393622399997184

demo % swiftc -O demo.swift
demo % ./demo
With params: 0.000284381000028588
Without params: 0.000306404000184557