From 470d047e8dd21a4055e78d079666475075375296 Mon Sep 17 00:00:00 2001
From: Ali Dehghani <ali.dehghani.g@gmail.com>
Date: Fri, 29 May 2020 00:29:27 +0430
Subject: [PATCH 1/2] Introducing Constant Folding & Dead Code Elimination

---
 jmh/src/main/java/com/baeldung/BenchMark.java | 46 ++++++++++++++++++-
 1 file changed, 45 insertions(+), 1 deletion(-)

diff --git a/jmh/src/main/java/com/baeldung/BenchMark.java b/jmh/src/main/java/com/baeldung/BenchMark.java
index b0e1caf4dc..55157848ab 100644
--- a/jmh/src/main/java/com/baeldung/BenchMark.java
+++ b/jmh/src/main/java/com/baeldung/BenchMark.java
@@ -1,14 +1,20 @@
 package com.baeldung;
 
-import com.google.common.hash.HashFunction;
 import com.google.common.hash.Hasher;
 import com.google.common.hash.Hashing;
 import org.openjdk.jmh.annotations.*;
+import org.openjdk.jmh.infra.Blackhole;
 
 import java.nio.charset.Charset;
+import java.util.concurrent.TimeUnit;
 
 public class BenchMark {
 
+    @State(Scope.Benchmark)
+    public static class Log {
+        public int x = 8;
+    }
+
     @State(Scope.Benchmark)
     public static class ExecutionPlan {
 
@@ -45,4 +51,42 @@ public class BenchMark {
         // Do nothing
     }
 
+    @Benchmark
+    @OutputTimeUnit(TimeUnit.NANOSECONDS)
+    @BenchmarkMode(Mode.AverageTime)
+    public void doNothing() {}
+
+    @Benchmark
+    @OutputTimeUnit(TimeUnit.NANOSECONDS)
+    @BenchmarkMode(Mode.AverageTime)
+    public void objectCreation() {
+        new Object();
+    }
+
+    @Benchmark
+    @OutputTimeUnit(TimeUnit.NANOSECONDS)
+    @BenchmarkMode(Mode.AverageTime)
+    public Object pillarsOfCreation() {
+        return new Object();
+    }
+
+    @Benchmark
+    @OutputTimeUnit(TimeUnit.NANOSECONDS)
+    @BenchmarkMode(Mode.AverageTime)
+    public void blackHole(Blackhole blackhole) {
+        blackhole.consume(new Object());
+    }
+
+    @Benchmark
+    public double foldedLog() {
+        int x = 8;
+
+        return Math.log(x);
+    }
+
+    @Benchmark
+    public double log(Log input) {
+        return Math.log(input.x);
+    }
+
 }

From 0986bbcd622c6fd284b674bf85b65223b0c328e9 Mon Sep 17 00:00:00 2001
From: Ali Dehghani <ali.dehghani.g@gmail.com>
Date: Sat, 30 May 2020 09:23:53 +0430
Subject: [PATCH 2/2] On the next line

---
 jmh/src/main/java/com/baeldung/BenchMark.java | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/jmh/src/main/java/com/baeldung/BenchMark.java b/jmh/src/main/java/com/baeldung/BenchMark.java
index 55157848ab..3c5c840db2 100644
--- a/jmh/src/main/java/com/baeldung/BenchMark.java
+++ b/jmh/src/main/java/com/baeldung/BenchMark.java
@@ -54,7 +54,9 @@ public class BenchMark {
     @Benchmark
     @OutputTimeUnit(TimeUnit.NANOSECONDS)
     @BenchmarkMode(Mode.AverageTime)
-    public void doNothing() {}
+    public void doNothing() {
+
+    }
 
     @Benchmark
     @OutputTimeUnit(TimeUnit.NANOSECONDS)