Add MultiFunctionInterfaceBenchmark

Author: igoriakovlev

src/wasmMain/kotlin/microBenchmarks/MultiFunctionInterfaceBenchmark.kt

@@ -0,0 +1,68 @@
+/*
+ * Copyright 2025 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.*
+
+private const val RUNS = 1_000_000
+
+@State(Scope.Benchmark)
+class MultiFunctionInterfaceBenchmark {
+    interface IFunc :
+        Function<Int>,
+        Function1<Int, Int>,
+        Function2<Int, Int, Int>,
+        Function3<Int, Int, Int, Int>,
+        Function4<Int, Int, Int, Int, Int>,
+        Function5<Int, Int, Int, Int, Int, Int>
+
+    @State(Scope.Benchmark)
+    class IFuncClass : IFunc {
+        override fun invoke(p1: Int): Int = p1
+
+        override fun invoke(p1: Int, p2: Int): Int = p1 + p2
+
+        override fun invoke(p1: Int, p2: Int, p3: Int): Int = p1 + p2 + p3
+
+        override fun invoke(p1: Int, p2: Int, p3: Int, p4: Int): Int = p1 + p2 + p3 + p4
+
+        override fun invoke(p1: Int, p2: Int, p3: Int, p4: Int, p5: Int): Int = p1 + p2 + p3 + p4 + p5
+    }
+
+    private lateinit var iFunc: IFunc
+
+    @Setup
+    fun setup() {
+        iFunc = IFuncClass()
+    }
+
+    @Benchmark
+    fun interfaceFunctionCall(): Int {
+        val obj = iFunc
+        var result = 0
+        var i = 0
+        while (i < RUNS) {
+            result += obj(i)
+            result += obj(i, i)
+            result += obj(i, i, i)
+            result += obj(i, i, i, i)
+            result += obj(i, i, i, i, i)
+            i++
+        }
+        return result
+    }
+}