Add benchmark for UnsafeMutableRawBufferPointer firstIndex(of:) and lastIndex(of:)

benchmark/CMakeLists.txt

@@ -45,6 +45,7 @@ set(SWIFT_BENCH_MODULES
     single-source/Breadcrumbs
     single-source/BucketSort
     single-source/BufferFill
+    single-source/BufferFind
     single-source/ByteSwap
     single-source/COWTree
     single-source/COWArrayGuaranteedParameterOverhead

benchmark/single-source/BufferFind.swift

@@ -0,0 +1,126 @@
+//===--- BufferFind.swift -------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2021 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 var benchmarks: [BenchmarkInfo] = [
+  BenchmarkInfo(
+    name: "RawBuffer.100000.findFirst",
+    runFunction: run_BufferFindFirst,
+    tags: [.validation, .api],
+    setUpFunction: buffer100000Setup,
+    tearDownFunction: bufferTeardown
+  ),
+  BenchmarkInfo(
+    name: "RawBuffer.100000.findLast",
+    runFunction: run_BufferFindLast,
+    tags: [.validation, .api],
+    setUpFunction: buffer100000Setup,
+    tearDownFunction: bufferTeardown
+  ),
+  // size 1000, alignment 0
+  BenchmarkInfo(
+    name: "RawBuffer.1000.findFirst",
+    runFunction: run_BufferFindFirst,
+    tags: [.validation, .api],
+    setUpFunction: buffer1000Setup,
+    tearDownFunction: bufferTeardown
+  ),
+  BenchmarkInfo(
+    name: "RawBuffer.1000.findLast",
+    runFunction: run_BufferFindLast,
+    tags: [.validation, .api],
+    setUpFunction: buffer1000Setup,
+    tearDownFunction: bufferTeardown
+  ),
+  // size 100, alignment 0
+  BenchmarkInfo(
+    name: "RawBuffer.100.findFirst",
+    runFunction: run_BufferFindFirst,
+    tags: [.validation, .api],
+    setUpFunction: buffer100Setup,
+    tearDownFunction: bufferTeardown
+  ),
+  BenchmarkInfo(
+    name: "RawBuffer.100.findLast",
+    runFunction: run_BufferFindLast,
+    tags: [.validation, .api],
+    setUpFunction: buffer100Setup,
+    tearDownFunction: bufferTeardown
+  ),
+  // size 10, alignment 0
+  BenchmarkInfo(
+    name: "RawBuffer.10.findFirst",
+    runFunction: run_BufferFindFirst,
+    tags: [.validation, .api],
+    setUpFunction: buffer10Setup,
+    tearDownFunction: bufferTeardown
+  ),
+  BenchmarkInfo(
+    name: "RawBuffer.10.findLast",
+    runFunction: run_BufferFindLast,
+    tags: [.validation, .api],
+    setUpFunction: buffer10Setup,
+    tearDownFunction: bufferTeardown
+  )
+]
+
+var buffer: UnsafeMutableRawBufferPointer = .init(start: nil, count: 0)
+
+func buffer100000Setup() {
+  bufferSetup(size: 100_000, alignment: 0)
+}
+
+func buffer1000Setup() {
+  bufferSetup(size: 1000, alignment: 0)
+}
+
+func buffer100Setup() {
+  bufferSetup(size: 100, alignment: 0)
+}
+
+func buffer10Setup() {
+  bufferSetup(size: 10, alignment: 0)
+}
+
+func bufferTeardown() {
+  buffer.deallocate()
+  buffer = .init(start: nil, count: 0)
+}
+
+func bufferSetup(size: Int, alignment: Int) {
+  buffer = UnsafeMutableRawBufferPointer.allocate(byteCount: size, alignment: alignment)
+  buffer.initializeMemory(as: UInt8.self, repeating: UInt8.min)
+  buffer[size / 2] = UInt8.max
+}
+
+@inline(never)
+public func run_BufferFindFirst(n: Int) {
+  var offset = 0
+  for _ in 0 ..< n * 10 {
+    if let index = buffer.firstIndex(of: UInt8.max) {
+      offset += index
+    }
+  }
+  blackHole(offset)
+}
+
+@inline(never)
+public func run_BufferFindLast(n: Int) {
+  var offset = 0
+  for _ in 0 ..< n * 10 {
+    if let index = buffer.lastIndex(of: UInt8.max) {
+      offset += index
+    }
+  }
+  blackHole(offset)
+}

benchmark/utils/main.swift

@@ -33,6 +33,7 @@ import BitCount
 import Breadcrumbs
 import BucketSort
 import BufferFill
+import BufferFind
 import ByteSwap
 import COWTree
 import COWArrayGuaranteedParameterOverhead
@@ -219,6 +220,7 @@ register(BitCount.benchmarks)
 register(Breadcrumbs.benchmarks)
 register(BucketSort.benchmarks)
 register(BufferFill.benchmarks)
+register(BufferFind.benchmarks)
 register(ByteSwap.benchmarks)
 register(COWTree.benchmarks)
 register(COWArrayGuaranteedParameterOverhead.benchmarks)