[cxx-interop] Add initial benchmark to compare vector<uint32_t> sum i…

benchmark/CMakeLists.txt

@@ -199,6 +199,7 @@ set(SWIFT_BENCH_MODULES
     single-source/WordCount
     single-source/XorLoop
     cxx-source/CreateObjects
+    cxx-source/CxxVectorSum
     cxx-source/ReadAccessor
 )
 

benchmark/Package.swift

@@ -169,7 +169,9 @@ targets += cxxSingleSourceLibraries.map { name in
     swiftSettings: [.unsafeFlags(["-Xfrontend",
                                   "-enable-experimental-cxx-interop",
                                   "-I",
-                                  "utils/CxxTests"])])
+                                  "utils/CxxTests",
+                                  // FIXME: https://github.com/apple/swift/issues/61453
+                                  "-Xfrontend", "-validate-tbd-against-ir=none"])])
 }
 
 targets += multiSourceLibraries.map { lib in

benchmark/cmake/modules/AddSwiftBenchmarkSuite.cmake

@@ -484,6 +484,8 @@ function (swift_benchmark_compile_archopts)
       set(cxx_options "")
       if ("${module_name_path}" MATCHES ".*cxx-source/.*")
         list(APPEND cxx_options "-Xfrontend" "-enable-experimental-cxx-interop" "-I" "${srcdir}/utils/CxxTests/")
+        # FIXME: https://github.com/apple/swift/issues/61453
+        list(APPEND cxx_options "-Xfrontend" "-validate-tbd-against-ir=none")
       endif()
 
       if ("${bench_flags}" MATCHES "-whole-module.*")

benchmark/cxx-source/CxxVectorSum.swift

@@ -0,0 +1,129 @@
+//===--- CxxVectorSum.swift -----------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2012 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
+//
+//===----------------------------------------------------------------------===//
+
+// This is a benchmark that tracks how quickly Swift can sum up a C++ vector
+// as compared to the C++ implementation of such sum.
+
+import TestsUtils
+import CxxStdlibPerformance
+import Cxx
+
+// FIXME: Linux needs fix for https://github.com/apple/swift/issues/61547.
+#if os(Linux)
+public let benchmarks: [BenchmarkInfo] = []
+#else
+public let benchmarks = [
+  BenchmarkInfo(
+      name: "CxxVecU32.sum.Cxx.rangedForLoop",
+      runFunction: run_CxxVectorOfU32_Sum_Cxx_RangedForLoop,
+      tags: [.validation, .bridging, .cxxInterop],
+      setUpFunction: makeVectorOnce),
+  BenchmarkInfo(
+    name: "CxxVecU32.sum.Swift.forInLoop",
+    runFunction: run_CxxVectorOfU32_Sum_Swift_ForInLoop,
+    tags: [.validation, .bridging, .cxxInterop],
+    setUpFunction: makeVectorOnce),
+  BenchmarkInfo(
+    name: "CxxVecU32.sum.Swift.iteratorLoop",
+    runFunction: run_CxxVectorOfU32_Sum_Swift_RawIteratorLoop,
+    tags: [.validation, .bridging, .cxxInterop],
+    setUpFunction: makeVectorOnce),
+  BenchmarkInfo(
+    name: "CxxVecU32.sum.Swift.subscriptLoop",
+    runFunction: run_CxxVectorOfU32_Sum_Swift_IndexAndSubscriptLoop,
+    tags: [.validation, .bridging, .cxxInterop],
+    setUpFunction: makeVectorOnce),
+  BenchmarkInfo(
+    name: "CxxVecU32.sum.Swift.reduce",
+    runFunction: run_CxxVectorOfU32_Sum_Swift_Reduce,
+    tags: [.validation, .bridging, .cxxInterop],
+    setUpFunction: makeVectorOnce)
+]
+
+func makeVectorOnce() {
+    initVector(vectorSize)
+}
+
+// FIXME: compare CxxVectorOfU32SumInCxx to CxxVectorOfU32SumInSwift and
+// establish an expected threshold of performance, which when exceeded should
+// fail the benchmark.
+
+// FIXME: Bump up to 50k and 10 once the sequence is faster.
+let vectorSize = 25_000
+let iterRepeatFactor = 7
+
+@inline(never)
+public func run_CxxVectorOfU32_Sum_Cxx_RangedForLoop(_ n: Int) {
+  let sum = testVector32Sum(vectorSize, n * iterRepeatFactor)
+  blackHole(sum)
+}
+
+@inline(never)
+public func run_CxxVectorOfU32_Sum_Swift_ForInLoop(_ n: Int) {
+    let vectorOfU32 = makeVector32(vectorSize)
+    var sum: UInt32 = 0
+    for _ in 0..<(n * iterRepeatFactor) {
+      for x in vectorOfU32 {
+        sum = sum &+ x
+      }
+    }
+    blackHole(sum)
+}
+
+// This function should have comparable performance to
+// `run_CxxVectorOfU32_Sum_Cxx_RangedForLoop`.
+@inline(never)
+public func run_CxxVectorOfU32_Sum_Swift_RawIteratorLoop(_ n: Int) {
+  let vectorOfU32 = makeVector32(vectorSize)
+  var sum: UInt32 = 0
+  for _ in 0..<(n * iterRepeatFactor) {
+    var b = vectorOfU32.__beginUnsafe()
+    let e = vectorOfU32.__endUnsafe()
+    while b != e {
+        sum = sum &+ b.pointee
+        b = b.successor()
+    }
+  }
+  blackHole(sum)
+}
+
+// Need to wait for https://github.com/apple/swift/issues/61499
+@inline(never)
+public func run_CxxVectorOfU32_Sum_Swift_IndexAndSubscriptLoop(_ n: Int) {
+#if FIXED_61499
+  let vectorOfU32 = makeVector32(vectorSize)
+  var sum: UInt32 = 0
+  for _ in 0..<(n * iterRepeatFactor) {
+    for i in 0..<vectorOfU32.size() {
+      sum = sum &+ vectorOfU32[i]
+    }
+  }
+  blackHole(sum)
+#else
+  run_CxxVectorOfU32_Sum_Swift_RawIteratorLoop(n)
+#endif
+}
+
+@inline(never)
+public func run_CxxVectorOfU32_Sum_Swift_Reduce(_ n: Int) {
+    let vectorOfU32 = makeVector32(vectorSize)
+    var sum: UInt32 = 0
+    for _ in 0..<(n * iterRepeatFactor) {
+      sum = vectorOfU32.reduce(sum, &+)
+    }
+    blackHole(sum)
+}
+
+extension VectorOfU32.const_iterator : Equatable, UnsafeCxxInputIterator { }
+
+extension VectorOfU32: CxxSequence {}
+#endif

benchmark/utils/CxxTests/CxxStdlibPerformance.h

@@ -0,0 +1,37 @@
+#pragma once
+
+#include <cstdint>
+#include <vector>
+
+using VectorOfU32 = std::vector<uint32_t>;
+
+static inline VectorOfU32 vec;
+
+inline void initVector(size_t size) {
+    if (!vec.empty()) {
+        return;
+    }
+    vec.reserve(size);
+    for (size_t i = 0; i < size; ++i) {
+        vec.push_back(uint32_t(i));
+    }
+}
+
+inline VectorOfU32 makeVector32(size_t size) {
+    initVector(size);
+    return vec;
+}
+
+inline uint32_t testVector32Sum(size_t vectorSize, size_t iters) {
+    auto vector = makeVector32(vectorSize);
+    auto sum = uint32_t(0);
+    for (size_t i = 0; i < iters; ++i) {
+        for (auto x : vector) {
+            sum += x;
+        }
+    }
+    return sum;
+}
+
+// FIXME: remove when the templated operator == is correctly bridged.
+inline bool operator ==(const VectorOfU32::const_iterator &lhs, const VectorOfU32::const_iterator &rhs) { return lhs.base() == rhs.base(); }

benchmark/utils/CxxTests/module.modulemap

@@ -7,3 +7,8 @@ module CxxSubscripts {
   header "Subscripts.h"
   requires cplusplus
 }
+
+module CxxStdlibPerformance {
+  header "CxxStdlibPerformance.h"
+  requires cplusplus
+}

benchmark/utils/main.swift

@@ -50,6 +50,7 @@ import ClassArrayGetter
 import CodableTest
 import Combos
 import CreateObjects
+import CxxVectorSum
 import DataBenchmarks
 import DeadArray
 import DevirtualizeProtocolComposition
@@ -233,6 +234,7 @@ register(CodableTest.benchmarks)
 register(Combos.benchmarks)
 register(ClassArrayGetter.benchmarks)
 register(CreateObjects.benchmarks)
+register(CxxVectorSum.benchmarks)
 register(DataBenchmarks.benchmarks)
 register(DeadArray.benchmarks)
 register(DevirtualizeProtocolComposition.benchmarks)