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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2021 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 benchmarks =
BenchmarkInfo(
name: "StackPromo",
runFunction: run_StackPromo,
tags: [.regression, .cpubench],
legacyFactor: 100)
protocol Proto {
func at() -> Int
}
@inline(never)
func testStackAllocation(_ p: Proto) -> Int {
var a = [p, p, p]
var b = 0
a.withUnsafeMutableBufferPointer {
let array = $0
for i in 0..<array.count {
b += array[i].at()
}
}
return b
}
class Foo : Proto {
init() {}
func at() -> Int{
return 1
}
}
@inline(never)
func work(_ f: Foo) -> Int {
var r = 0
for _ in 0..<1_000 {
r += testStackAllocation(f)
}
return r
}
public func run_StackPromo(_ n: Int) {
let foo = Foo()
var r = 0
for i in 0..<n {
if i % 2 == 0 {
r += work(foo)
} else {
r -= work(foo)
}
}
blackHole(r)
}
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