Merge pull request #33801 from xwu/generic-conversion-performance

[benchmark] Add new benchmark for floating-point conversion

Author: xwu

benchmark/CMakeLists.txt

@@ -91,6 +91,7 @@ set(SWIFT_BENCH_MODULES
     single-source/Fibonacci
     single-source/FindStringNaive
     single-source/FlattenList
+    single-source/FloatingPointConversion
     single-source/FloatingPointParsing
     single-source/FloatingPointPrinting
     single-source/Hanoi

benchmark/scripts/Template.swift

@@ -2,7 +2,7 @@
 //
 // This source file is part of the Swift.org open source project
 //
-// Copyright (c) 2014 - 2019 Apple Inc. and the Swift project authors
+// Copyright (c) 2020 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
@@ -19,4 +19,4 @@ public let {name} = [
 @inline(never)
 public func run_{name}(N: Int) {{
     // TODO
-}}
+}}

benchmark/single-source/FloatingPointConversion.swift

@@ -0,0 +1,66 @@
+//===--- FloatingPointConversion.swift ------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2020 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 FloatingPointConversion = [
+  BenchmarkInfo(
+    name: "ConvertFloatingPoint.ConcreteDoubleToDouble",
+    runFunction: run_ConvertFloatingPoint_ConcreteDoubleToDouble,
+    tags: [.validation, .api]),
+  BenchmarkInfo(
+    name: "ConvertFloatingPoint.GenericDoubleToDouble",
+    runFunction: run_ConvertFloatingPoint_GenericDoubleToDouble,
+    tags: [.validation, .api]),
+]
+
+let doubles = [
+   1.8547832857295,  26.321549267719135, 98.9544480962058,    73.70286973782363,
+  82.04918555938816, 76.38902969312758,  46.35647857011161,   64.0821426030317,
+  97.82373347320156, 55.742361037720634, 23.677941665488856,  93.7347588108058,
+  80.72657040828412, 32.137580733275826, 64.78192587530002,   21.459686568896863,
+  24.88407660280718, 85.25905561999171,  12.858847331083556,  29.418845887252864,
+  67.64627066438761, 68.09883494078815,  57.781587230862094,  63.38335631088038,
+  83.31376661495327, 87.45936846358906,   0.6757674136841918, 86.45465036820696,
+  84.72715137492781, 82.67894289189142,  26.1667640621554,    21.24895661442493,
+  65.06399183516027, 90.06549073883058,  59.2736650501005,    94.5800380563246,
+  84.22617424003917, 26.93158630395639,   9.069952095976841,  96.10067836567679,
+  62.60505762081415, 29.57878462599286,  66.06040114311294,   51.709999429326636,
+  64.79777579583545, 45.25948795832151,  94.31492354198335,   52.31096166433902,
+]
+
+@inline(__always)
+func convert<
+  T: BinaryFloatingPoint, U: BinaryFloatingPoint
+>(_ value: T, to: U.Type) -> U {
+  U(value)
+}
+
+@inline(never)
+public func run_ConvertFloatingPoint_ConcreteDoubleToDouble(_ N: Int) {
+  for _ in 0..<(N * 100) {
+    for element in doubles {
+      let f = Double(identity(element))
+      blackHole(f)
+    }
+  }
+}
+
+@inline(never)
+public func run_ConvertFloatingPoint_GenericDoubleToDouble(_ N: Int) {
+  for _ in 0..<(N * 100) {
+    for element in doubles {
+      let f = convert(identity(element), to: Double.self)
+      blackHole(f)
+    }
+  }
+}

benchmark/utils/main.swift

@@ -79,6 +79,7 @@ import ExistentialPerformance
 import Fibonacci
 import FindStringNaive
 import FlattenList
+import FloatingPointConversion
 import FloatingPointParsing
 import FloatingPointPrinting
 import Hanoi
@@ -266,6 +267,7 @@ registerBenchmark(Fibonacci)
 registerBenchmark(FindStringNaive)
 registerBenchmark(FlattenListLoop)
 registerBenchmark(FlattenListFlatMap)
+registerBenchmark(FloatingPointConversion)
 registerBenchmark(FloatingPointParsing)
 registerBenchmark(FloatingPointPrinting)
 registerBenchmark(Hanoi)