Add benchmark for iterating Data

Author: Kevin Ballard

benchmark/CMakeLists.txt

@@ -37,6 +37,7 @@ set(SWIFT_BENCH_MODULES
     single-source/CaptureProp
     single-source/Chars
     single-source/ClassArrayGetter
+    single-source/Data
     single-source/DeadArray
     single-source/DictionaryBridge
     single-source/DictionaryLiteral

benchmark/single-source/Data.swift

@@ -0,0 +1,34 @@
+//===--- Data.swift -------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+import TestsUtils
+import Foundation
+
+@inline(never)
+func generateData() -> Data {
+  var data = Data(count: 16 * 1024)
+  data.withUnsafeMutableBytes { (ptr: UnsafeMutablePointer<UInt8>) -> () in
+    for i in 0..<data.count {
+      ptr[i] = UInt8(i % 23)
+    }
+  }
+  return data
+}
+
+@inline(never)
+public func run_IterateData(_ N: Int) {
+  let data = generateData()
+
+  for _ in 0...10*N {
+    _ = data.reduce(0, +)
+  }
+}

benchmark/utils/main.swift

@@ -38,6 +38,7 @@ import Calculator
 import CaptureProp
 import Chars
 import ClassArrayGetter
+import Data
 import DeadArray
 import DictTest
 import DictTest2
@@ -141,6 +142,7 @@ precommitTests = [
   "HashTest": run_HashTest,
   "Histogram": run_Histogram,
   "Integrate": run_Integrate,
+  "IterateData": run_IterateData,
   "Join": run_Join,
   "LinkedList": run_LinkedList,
   "MapReduce": run_MapReduce,