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//===--- COWArrayGuaranteedParameterOverhead.swift ------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2018 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
// This test makes sure that even though we have +0 arguments by default that we
// can properly convert +0 -> +1 to avoid extra COW copies.
public let benchmarks =
BenchmarkInfo(
name: "COWArrayGuaranteedParameterOverhead",
runFunction: run_COWArrayGuaranteedParameterOverhead,
tags: [.regression, .abstraction, .refcount],
legacyFactor: 50
)
@inline(never)
func caller() {
let x = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]
blackHole(callee(x))
}
@inline(never)
func callee(_ x: [Int]) -> [Int] {
var y = x
// This should not copy.
y[2] = 27
return y
}
@inline(never)
public func run_COWArrayGuaranteedParameterOverhead(_ n: Int) {
for _ in 0..<n*400 {
caller()
}
}
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