Boxing benchmarks

Author: igoriakovlev

src/commonMain/kotlin/microBenchmarks/BoxingBenchmark.kt

@@ -0,0 +1,86 @@
+/*
+ * Copyright 2024 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package microBenchmarks
+
+import kotlinx.benchmark.*
+
+@State(Scope.Benchmark)
+
+
+class BoxingBenchmark {
+    @Benchmark
+    fun integerTypeBoxing(): Int {
+        val size = BENCHMARK_SIZE
+        var box: Int? = 42
+        var unbox: Int = 24
+        for (i in 0..size) {
+            val value: Int = box!!
+            box = unbox
+            unbox = value
+        }
+        return box.hashCode() + unbox.hashCode()
+    }
+
+    @Benchmark
+    fun booleanTypeBoxing(): Int {
+        val size = BENCHMARK_SIZE
+        var box: Boolean? = true
+        var unbox: Boolean = false
+        for (i in 0..size) {
+            val value: Boolean = box!!
+            box = unbox
+            unbox = value
+        }
+        return box.hashCode() + unbox.hashCode()
+    }
+
+    @Benchmark
+    fun referenceTypeVarClosure(): Int {
+        val size = BENCHMARK_SIZE * 10
+        var varBox1: Any = Any()
+        var varBox2: Any = Any()
+        val closure = {
+            val value = varBox1
+            varBox1 = varBox2
+            varBox2 = value
+        }
+
+        for (i in 0..size) {
+            closure()
+        }
+
+        return varBox1.hashCode() + varBox2.hashCode()
+    }
+
+    @Benchmark
+    fun integerTypeVarClosure(): Int {
+        val size = BENCHMARK_SIZE * 10
+        var varBox1: Int = 42
+        var varBox2: Int = 24
+        val closure = {
+            val value = varBox1
+            varBox1 = varBox2
+            varBox2 = value
+        }
+
+        for (i in 0..size) {
+            closure()
+        }
+
+        return varBox1.hashCode() + varBox2.hashCode()
+    }
+}