Add SortArrayInClass benchmark.

benchmark/CMakeLists.txt

@@ -151,6 +151,7 @@ set(SWIFT_BENCH_MODULES
     single-source/SetTests
     single-source/SevenBoom
     single-source/Sim2DArray
+    single-source/SortArrayInClass
     single-source/SortIntPyramids
     single-source/SortLargeExistentials
     single-source/SortLettersInPlace

benchmark/single-source/SortArrayInClass.swift

@@ -0,0 +1,85 @@
+//===--- SortArrayInClass.swift -------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2019 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
+//
+// This benchmark is derived from user code that encoutered a major
+// performance problem in normal usage. Contributed by Saleem
+// Abdulrasool (compnerd).
+//
+//===----------------------------------------------------------------------===//
+
+import TestsUtils
+
+// Specifically tests efficient access to Array subscript when the
+// array is a class property, but also generally tests quicksort in a
+// class which needs a slew of array optimizations, uniqueness, bounds
+// and exclusivity optimizations.
+public let SortArrayInClass = [
+  BenchmarkInfo(
+    name: "SortArrayInClass",
+    runFunction: run_SortArrayInClass,
+    tags: [.abstraction, .safetychecks, .exclusivity, .algorithm, .api, .Array])
+]
+
+let LARGE_ARRAY_SIZE = 10000
+
+class Sorter {
+  var array: [Int]
+  init(size: Int) {
+    array = Array((0..<size).reversed())
+  }
+
+  private func _swap(i: Int, j: Int) {
+    let t = array[i]
+    // This currently copies the entire array.  Assigning to a
+    // temporary, or using swapAt would avoid the copy, but users
+    // shouldn't need to know that.
+    array[i] = array[j]
+    array[j] = t
+  }
+
+  private func _quicksort(left: Int, right: Int) {
+
+    if left < right {
+      let pivot = array[left + ((right - left) / 2)]
+      var left_new = left
+      var right_new = right
+
+      repeat {
+        while array[left_new] < pivot {
+          left_new += 1
+        }
+        while pivot < array[right_new] {
+          right_new -= 1
+        }
+        if left_new <= right_new {
+          _swap(i:left_new, j:right_new)
+          left_new += 1
+          right_new -= 1
+        }
+      } while left_new <= right_new
+
+      _quicksort(left: left, right: right_new)
+      _quicksort(left: left_new, right:right)
+    }
+  }
+
+  func quicksort() {
+    _quicksort(left:0, right:array.count - 1);
+  }
+}
+
+public func run_SortArrayInClass(_ N: Int) {
+  for _ in 1...N {
+    // The array needs to be reinitialized before each sort, so it
+    // can't be a setup/tearDown function.
+    let sorter = Sorter(size:LARGE_ARRAY_SIZE)
+    sorter.quicksort()
+  }
+}

benchmark/utils/TestsUtils.swift

@@ -28,6 +28,7 @@ public enum BenchmarkCategory : String {
   case runtime, refcount, metadata
   // Other general areas of compiled code validation.
   case abstraction, safetychecks, exceptions, bridging, concurrency, existential
+  case exclusivity
 
   // Algorithms are "micro" that test some well-known algorithm in isolation:
   // sorting, searching, hashing, fibonaci, crypto, etc.

benchmark/utils/main.swift

@@ -146,6 +146,7 @@ import SequenceAlgos
 import SetTests
 import SevenBoom
 import Sim2DArray
+import SortArrayInClass
 import SortIntPyramids
 import SortLargeExistentials
 import SortLettersInPlace
@@ -325,6 +326,7 @@ registerBenchmark(SequenceAlgos)
 registerBenchmark(SetTests)
 registerBenchmark(SevenBoom)
 registerBenchmark(Sim2DArray)
+registerBenchmark(SortArrayInClass)
 registerBenchmark(SortIntPyramids)
 registerBenchmark(SortLargeExistentials)
 registerBenchmark(SortLettersInPlace)