Adds benchmark for String(repeating:count:)

benchmark/CMakeLists.txt

@@ -187,6 +187,7 @@ set(SWIFT_BENCH_MODULES
     single-source/StringInterpolation
     single-source/StringMatch
     single-source/StringRemoveDupes
+    single-source/StringRepeating
     single-source/StringReplaceSubrange
     single-source/StringSplitting
     single-source/StringSwitch

benchmark/single-source/StringRepeating.swift

@@ -0,0 +1,143 @@
+//===--- StringRepeating.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
+//
+//===----------------------------------------------------------------------===//
+
+import TestsUtils
+
+public let StringRepeating = [
+  BenchmarkInfo(name: "StringRepeating/SingleAsciiCharacterCount10",
+                runFunction: run_singleAsciiCharacterCount10,
+                tags: [.validation, .api, .String]),
+  BenchmarkInfo(name: "StringRepeating/SingleAsciiCharacterCount1",
+                runFunction: run_singleAsciiCharacterCount1,
+                tags: [.validation, .api, .String]),
+  BenchmarkInfo(name: "StringRepeating/EmptyStringCount10",
+                runFunction: run_emptyStringCount10,
+                tags: [.validation, .api, .String]),
+  BenchmarkInfo(name: "StringRepeating/SingleAsciiCharacterCount0",
+                runFunction: run_singleAsciiCharacterCount0,
+                tags: [.validation, .api, .String]),
+  BenchmarkInfo(name: "StringRepeating/26AsciiCharactersCount2",
+                runFunction: run_26AsciiCharactersCount2,
+                tags: [.validation, .api, .String]),
+  BenchmarkInfo(name: "StringRepeating/SingleCyrilicCharacterCount5",
+                runFunction: run_singleCyrilicCharacterCount5,
+                tags: [.validation, .api, .String]),
+  BenchmarkInfo(name: "StringRepeating/33CyrilicCharactersCount2",
+                runFunction: run_33CyrilicCharactersCount2,
+                tags: [.validation, .api, .String]),
+  BenchmarkInfo(name: "StringRepeating/U1F1F8U1F1FACount2",
+                runFunction: run_U1F1F8U1F1FACount2,
+                tags: [.validation, .api, .String]),
+  BenchmarkInfo(name: "StringRepeating/U301cafeCount5",
+                runFunction: run_U301cafeCount5,
+                tags: [.validation, .api, .String]),
+  BenchmarkInfo(name: "StringRepeating/LongMixedStringCount100",
+                runFunction: run_longMixedStringCount100,
+                tags: [.validation, .api, .String])
+]
+
+@inline(never)
+func repeating(_ i: String, count: Int) -> String {
+  let s = String(repeating: getString(i), count: count)
+  return s
+}
+
+@inline(never)
+public func run_singleAsciiCharacterCount10(N: Int) {
+    for _ in 1...5000*N {
+        blackHole(repeating("x", count: 10))
+    }
+}
+
+@inline(never)
+public func run_singleAsciiCharacterCount1(N: Int) {
+    for _ in 1...5000*N {
+        blackHole(repeating("x", count: 1))
+    }
+}
+
+@inline(never)
+public func run_emptyStringCount10(N: Int) {
+    for _ in 1...5000*N {
+        blackHole(repeating("", count: 10))
+    }
+}
+
+@inline(never)
+public func run_singleAsciiCharacterCount0(N: Int) {
+    for _ in 1...5000*N {
+        blackHole(repeating("x", count: 0))
+    }
+}
+
+@inline(never)
+public func run_26AsciiCharactersCount2(N: Int) {
+    for _ in 1...5000*N {
+        blackHole(repeating("abcdefghijklmnopqrstuvwxyz", count: 2))
+    }
+}
+
+@inline(never)
+public func run_singleCyrilicCharacterCount5(N: Int) {
+    for _ in 1...5000*N {
+        blackHole(repeating("я", count: 5))
+    }
+}
+
+@inline(never)
+public func run_33CyrilicCharactersCount2(N: Int) {
+    for _ in 1...5000*N {
+        blackHole(repeating("абвгґдеєжзиіїйклмнопрстуфхцчшщьюя", count: 2))
+    }
+}
+
+@inline(never)
+public func run_U1F1F8U1F1FACount2(N: Int) {
+    for _ in 1...5000*N {
+        blackHole(repeating("\u{1F1F8}\u{1F1FA}\u{1F1F8}\u{1F1FA}", count: 2))
+    }
+}
+
+@inline(never)
+public func run_U301cafeCount5(N: Int) {
+    for _ in 1...5000*N {
+        blackHole(repeating("\u{301}cafe", count: 5))
+    }
+}
+
+func getLongString() -> String {
+  let long = """
+    Swift is a multi-paradigm, compiled programming language created for
+     iOS, OS X, watchOS, tvOS and Linux development by Apple Inc. Swift is
+     designed to work with Apple's Cocoa and Cocoa Touch frameworks and the
+     large body of existing Objective-C code written for Apple products. Swift
+     is intended to be more resilient to erroneous code (\"safer\") than
+     Objective-C and also more concise. It is built with the LLVM compiler
+     framework included in Xcode 6 and later and uses the Objective-C runtime,
+     which allows C, Objective-C, C++ and Swift code to run within a single
+     program.
+     Існує багато варіацій уривків з Lorem Ipsum, але більшість з них зазнала
+     певних змін на кшталт жартівливих вставок або змішування слів, які навіть
+     не виглядають правдоподібно.
+     日本語の場合はランダムに生成された文章以外に、
+     著作権が切れた小説などが利用されることもある。
+     🦩
+    """
+  return getString(long)
+}
+
+@inline(never)
+public func run_longMixedStringCount100(N: Int) {
+    for _ in 1...5000*N {
+        blackHole(repeating(getLongString(), count: 100))
+    }
+}

benchmark/utils/main.swift

@@ -379,6 +379,7 @@ register(StringEnum.benchmarks)
 register(StringInterpolation.benchmarks)
 register(StringMatch.benchmarks)
 register(StringRemoveDupes.benchmarks)
+registerBenchmark(StringRepeating.benchmarks)
 register(StringReplaceSubrange.benchmarks)
 
 if #available(macOS 10.15, iOS 13, tvOS 13, watchOS 6, *) {