benchmarks: add a benchmark for AnyHashable initialization

Author: gribozavr

benchmark/CMakeLists.txt

@@ -21,6 +21,7 @@ set(SWIFT_BENCH_MODULES
     single-source/unit-tests/StackPromo
     single-source/Ackermann
     single-source/AngryPhonebook
+    single-source/AnyHashableWithAClass
     single-source/Array2D
     single-source/ArrayAppend
     single-source/ArrayInClass

benchmark/single-source/AnyHashableWithAClass.swift

@@ -0,0 +1,46 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See http://swift.org/LICENSE.txt for license information
+// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
+// This benchmark tests AnyHashable's initializer that needs to dynamically
+// upcast the instance to the type that introduces the Hashable
+// conformance.
+
+class TestHashableBase : Hashable {
+  var value: Int
+  init(_ value: Int) {
+    self.value = value
+  }
+  var hashValue: Int {
+    return value
+  }
+  static func == (
+    lhs: TestHashableBase,
+    rhs: TestHashableBase
+  ) -> Bool {
+    return lhs.value == rhs.value
+  }
+}
+
+class TestHashableDerived1 : TestHashableBase {}
+class TestHashableDerived2 : TestHashableDerived1 {}
+class TestHashableDerived3 : TestHashableDerived2 {}
+class TestHashableDerived4 : TestHashableDerived3 {}
+class TestHashableDerived5 : TestHashableDerived4 {}
+
+@inline(never)
+public func run_AnyHashableWithAClass(_ N: Int) {
+  let c = TestHashableDerived5(10)
+  for _ in 0...(N*500000) {
+    _ = AnyHashable(c)
+  }
+}
+

benchmark/utils/main.swift

@@ -22,6 +22,7 @@ import TestsUtils
 import DriverUtils
 import Ackermann
 import AngryPhonebook
+import AnyHashableWithAClass
 import Array2D
 import ArrayAppend
 import ArrayInClass
@@ -100,6 +101,7 @@ import XorLoop
 
 precommitTests = [
   "AngryPhonebook": run_AngryPhonebook,
+  "AnyHashableWithAClass": run_AnyHashableWithAClass,
   "Array2D": run_Array2D,
   "ArrayAppend": run_ArrayAppend,
   "ArrayAppendReserved": run_ArrayAppendReserved,