Scala3-InlinePerf.scala

import scala.quoted.*

@main def InlinePerf(numberOfTrials: Int*) =
  class Thing(var count: Int, var label: String)

  def trial(n: Int) =
    val startEnabled = System.nanoTime()
    val thing1 = new Thing(0, "label")
    for i <- 1 to n
    do
      invariantEnabled(thing1.label == "label") {
        thing1.count = (i * 2) % 3
      }
    val endEnabled = System.nanoTime()

    val startDisabled = System.nanoTime()
    val thing2 = new Thing(0, "label")
    for i <- 1 to n
    do
      invariantDisabled(thing2.label == "label") {
        thing2.count = (i * 2) % 3
      }
    val endDisabled = System.nanoTime()

    val startNoInline = System.nanoTime()
    val thing3 = new Thing(0, "label")
    for i <- 1 to n
    do
      invariantNoInline(thing3.label == "label") {
        thing3.count = (i * 2) % 3
      }
    val endNoInline = System.nanoTime()

    val diffEnabled  =  endEnabled - startEnabled
    val diffDisabled = endDisabled - startDisabled
    val diffNoInline = endNoInline - startNoInline
    val percent1 = (100.0 * diffEnabled)/diffDisabled
    val percent2 = (100.0 * diffNoInline)/diffDisabled
    println(f"| $n%6d | $diffEnabled%8d | $diffDisabled%8d | $percent1%7.2f%% " +
            f"| $diffNoInline%8d | $percent2%7.2f%% |")

  header
  footer
  if numberOfTrials.size == 0 then trial(1000)
  else for n <- numberOfTrials do trial(n)
  footer

  def header =
    println("|      N |                    Elapsed Times (nanos)             |")
    println("|        |  Enabled | Disabled |   E/D%   | NoInline |   N/D%   |")
  def footer =
    println("|+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++|")