From 158f40e7d04e17c4b042ff7a9c1db52ac827946f Mon Sep 17 00:00:00 2001
From: Matthew Hall <matthew.hall3@outlook.com>
Date: Thu, 23 Oct 2025 10:21:35 -0400
Subject: [PATCH] Add benchmark for Class.isAssignableFrom

Signed-off-by: Matthew Hall <matthew.hall3@outlook.com>
---
 build.xml                                     | 10 +++
 .../IsAssignableFromBench.java                | 73 +++++++++++++++++++
 .../bumblebench/core/Launcher.java            |  1 +
 3 files changed, 84 insertions(+)
 create mode 100644 net/adoptopenjdk/bumblebench/casting/isAssignableFrom/IsAssignableFromBench.java

diff --git a/build.xml b/build.xml
index fb932a4..4d393bc 100644
--- a/build.xml
+++ b/build.xml
@@ -25,6 +25,7 @@ execute a build.
 	<property name="src-core" value="${basedir}/net/adoptopenjdk/bumblebench/core"/>
 	<property name="src-collections" value="${basedir}/net/adoptopenjdk/bumblebench/collections"/>
 	<property name="src-crypto" value="${basedir}/net/adoptopenjdk/bumblebench/crypto"/>
+    <property name="src-class" value="${basedir}/net/adoptopenjdk/bumblebench/casting/isAssignableFrom"/>
 	<property name="src-examples" value="${basedir}/net/adoptopenjdk/bumblebench/examples"/>
 	<property name="src-gpu" value="${basedir}/net/adoptopenjdk/bumblebench/gpu"/>
 	<property name="src-humble" value="${basedir}/net/adoptopenjdk/bumblebench/humble"/>
@@ -55,6 +56,15 @@ execute a build.
              includeantruntime="false"
              includes="**/ParallelBench.java">
 		</javac>
+    <javac srcdir="${src-class}" 
+             destdir=""
+             debug="on"
+             source="1.8"
+             target="1.8"
+             includeantruntime="false"
+             includes="**/*AssignableFromBench.java">
+		</javac>
+
 
 		<!-- collections -->
 		<javac srcdir="${src-collections}" 
diff --git a/net/adoptopenjdk/bumblebench/casting/isAssignableFrom/IsAssignableFromBench.java b/net/adoptopenjdk/bumblebench/casting/isAssignableFrom/IsAssignableFromBench.java
new file mode 100644
index 0000000..2a99d00
--- /dev/null
+++ b/net/adoptopenjdk/bumblebench/casting/isAssignableFrom/IsAssignableFromBench.java
@@ -0,0 +1,73 @@
+/*******************************************************************************
+* 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 net.adoptopenjdk.bumblebench.casting.isAssignableFrom;
+
+import java.util.Random;
+
+import net.adoptopenjdk.bumblebench.core.MicroBench;
+
+public final class IsAssignableFromBench extends MicroBench {
+
+    interface Barks {}
+    interface Meows {}
+    interface Sheds {}
+    interface LaysEggs {}
+
+    class Animal {}
+    class Plant {}
+
+    class Mamal extends Animal {}
+    class Reptile extends Animal {}
+    class Canine extends Mamal {}
+    class Feline extends Mamal {}
+
+    class Tree extends Plant {}
+
+    class Carniferous extends Tree {}
+    class Deciduous extends Tree {}
+
+    class Maple extends Deciduous {}
+
+    class Dog extends Canine implements Barks {}
+    class Cat extends Feline {}
+    class Fox extends Canine implements Sheds {}
+    class Platypus extends Mamal implements LaysEggs {}
+
+    class Lab extends Dog implements Sheds {}
+    class Poodle extends Dog {}
+    class Calico extends Cat implements Meows, Sheds {}
+
+    static Class<?> classes[] = {Barks.class, Meows.class, Sheds.class, LaysEggs.class, Animal.class, Plant.class, Mamal.class, Reptile.class, Canine.class, Feline.class, Tree.class, Carniferous.class, Deciduous.class, Mamal.class, 
+            Dog.class, Cat.class, Fox.class, Platypus.class, Lab.class, Poodle.class, Calico.class};
+
+    protected long doBatch(long numIterations) throws InterruptedException {
+        pauseTimer();
+        
+
+        Random r = new Random(1);
+        int length = classes.length;
+        boolean b = false;
+        for (long i = 0; i < numIterations; i++)
+        {
+            int first = r.nextInt(length);
+            int second = r.nextInt(length);
+            startTimer();
+            b = b ^ classes[first].isAssignableFrom(classes[second]);
+            pauseTimer();
+        }
+        return numIterations;
+    }
+}
+
diff --git a/net/adoptopenjdk/bumblebench/core/Launcher.java b/net/adoptopenjdk/bumblebench/core/Launcher.java
index 8650f4d..f2df184 100644
--- a/net/adoptopenjdk/bumblebench/core/Launcher.java
+++ b/net/adoptopenjdk/bumblebench/core/Launcher.java
@@ -78,6 +78,7 @@ static void runBumbleMainOn(BumbleBench instance) throws NoSuchMethodException,
 		+ ":net.adoptopenjdk.bumblebench.string"
 		+ ":net.adoptopenjdk.bumblebench.humble"
 		+ ":net.adoptopenjdk.bumblebench.arraycopy"
+		+ ":net.adoptopenjdk.bumblebench.casting.isAssignableFrom"
 		;
 
 	public static Class loadTestClass(String[] packageNames, String name) throws ClassNotFoundException, IOException {