Merge pull request #32492 from valeriyvan/StringRepeatingBenchmark

[stdlib][string] Add benchmark for String(repeating:count:)

Author: eeckstein

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 +1,76 @@
+//===--- StringRepeating.swift --------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2023 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 benchmarks = [
+  BenchmarkInfo(name: "String.initRepeating.1AsciiChar.Count100",
+                runFunction: run_singleAsciiCharacterCount100,
+                tags: [.validation, .api, .String]),
+  BenchmarkInfo(name: "String.initRepeating.26AsciiChar.Count2",
+                runFunction: run_26AsciiCharactersCount2,
+                tags: [.validation, .api, .String]),
+  BenchmarkInfo(name: "String.initRepeating.33CyrillicChar.Count2",
+                runFunction: run_33CyrillicCharactersCount2,
+                tags: [.validation, .api, .String]),
+  BenchmarkInfo(name: "String.initRepeating.longMixStr.Count100",
+                runFunction: run_longMixedStringCount100,
+                tags: [.validation, .api, .String])
+]
+
+@inline(never)
+public func run_singleAsciiCharacterCount100(N: Int) {
+  let string = "x"
+  for _ in 1...200*N {
+    blackHole(String(repeating: getString(string), count: 100))
+  }
+}
+
+@inline(never)
+public func run_26AsciiCharactersCount2(N: Int) {
+  let string = "abcdefghijklmnopqrstuvwxyz"
+  for _ in 1...200*N {
+    blackHole(String(repeating: getString(string), count: 2))
+  }
+}
+
+@inline(never)
+public func run_33CyrillicCharactersCount2(N: Int) {
+  let string = "абвгґдеєжзиіїйклмнопрстуфхцчшщьюя"
+  for _ in 1...200*N {
+    blackHole(String(repeating: getString(string), count: 2))
+  }
+}
+
+@inline(never)
+public func run_longMixedStringCount100(N: Int) {
+  let string = """
+    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。
+    🦩
+    """
+  for _ in 1...200*N {
+    blackHole(String(repeating: getString(string), count: 100))
+  }
+}

benchmark/utils/main.swift

@@ -188,6 +188,7 @@ import StringEnum
 import StringInterpolation
 import StringMatch
 import StringRemoveDupes
+import StringRepeating
 import StringReplaceSubrange
 import StringSplitting
 import StringSwitch
@@ -379,6 +380,7 @@ register(StringEnum.benchmarks)
 register(StringInterpolation.benchmarks)
 register(StringMatch.benchmarks)
 register(StringRemoveDupes.benchmarks)
+register(StringRepeating.benchmarks)
 register(StringReplaceSubrange.benchmarks)
 
 if #available(macOS 10.15, iOS 13, tvOS 13, watchOS 6, *) {