PaperMC/patches/server/0082-Optimize-DataBits.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Tue, 5 Apr 2016 21:38:58 -0400
Subject: [PATCH] Optimize DataBits

Remove Debug checks as these are super hot and causing noticeable hits

Before: http://i.imgur.com/nQsMzAE.png
After: http://i.imgur.com/nJ46crB.png

Optimize redundant converting of static fields into an unsigned long each call by precomputing it in ctor

diff --git a/src/main/java/net/minecraft/util/SimpleBitStorage.java b/src/main/java/net/minecraft/util/SimpleBitStorage.java
index ebfc546d258b92ee02e0e726b9d4dbff6a671d51..6426d6c2c31ead49444fe56e2230266290fa79dd 100644
--- a/src/main/java/net/minecraft/util/SimpleBitStorage.java
+++ b/src/main/java/net/minecraft/util/SimpleBitStorage.java
@@ -11,8 +11,8 @@ public class SimpleBitStorage implements BitStorage {
     private final long mask;
     private final int size;
     private final int valuesPerLong;
-    private final int divideMul;
-    private final int divideAdd;
+    private final int divideMul; private final long divideMulUnsigned; // Paper - referenced in b(int) with 2 Integer.toUnsignedLong calls
+    private final int divideAdd; private final long divideAddUnsigned; // Paper
     private final int divideShift;
 
     public SimpleBitStorage(int elementBits, int size, int[] is) {
@@ -56,8 +56,8 @@ public class SimpleBitStorage implements BitStorage {
         this.mask = (1L << elementBits) - 1L;
         this.valuesPerLong = (char)(64 / elementBits);
         int i = 3 * (this.valuesPerLong - 1);
-        this.divideMul = MAGIC[i + 0];
-        this.divideAdd = MAGIC[i + 1];
+        this.divideMul = MAGIC[i + 0]; this.divideMulUnsigned = Integer.toUnsignedLong(this.divideMul); // Paper
+        this.divideAdd = MAGIC[i + 1]; this.divideAddUnsigned = Integer.toUnsignedLong(this.divideAdd); // Paper
         this.divideShift = MAGIC[i + 2];
         int j = (size + this.valuesPerLong - 1) / this.valuesPerLong;
         if (data != null) {
@@ -73,15 +73,15 @@ public class SimpleBitStorage implements BitStorage {
     }
 
     private int cellIndex(int index) {
-        long l = Integer.toUnsignedLong(this.divideMul);
-        long m = Integer.toUnsignedLong(this.divideAdd);
-        return (int)((long)index * l + m >> 32 >> this.divideShift);
+        //long l = Integer.toUnsignedLong(this.divideMul); // Paper
+        //long m = Integer.toUnsignedLong(this.divideAdd); // Paper
+        return (int) ((long) index * this.divideMulUnsigned + this.divideAddUnsigned >> 32 >> this.divideShift); // Paper
     }
 
     @Override
-    public int getAndSet(int index, int value) {
-        Validate.inclusiveBetween(0L, (long)(this.size - 1), (long)index);
-        Validate.inclusiveBetween(0L, this.mask, (long)value);
+    public final int getAndSet(int index, int value) { // Paper - make final for inline
+        //Validate.inclusiveBetween(0L, (long)(this.size - 1), (long)index); // Paper
+        //Validate.inclusiveBetween(0L, this.mask, (long)value); // Paper
         int i = this.cellIndex(index);
         long l = this.data[i];
         int j = (index - i * this.valuesPerLong) * this.bits;
@@ -91,9 +91,9 @@ public class SimpleBitStorage implements BitStorage {
     }
 
     @Override
-    public void set(int index, int value) {
-        Validate.inclusiveBetween(0L, (long)(this.size - 1), (long)index);
-        Validate.inclusiveBetween(0L, this.mask, (long)value);
+    public final void set(int index, int value) { // Paper - make final for inline
+        //Validate.inclusiveBetween(0L, (long)(this.size - 1), (long)index); // Paper
+        //Validate.inclusiveBetween(0L, this.mask, (long)value); // Paper
         int i = this.cellIndex(index);
         long l = this.data[i];
         int j = (index - i * this.valuesPerLong) * this.bits;
@@ -101,8 +101,8 @@ public class SimpleBitStorage implements BitStorage {
     }
 
     @Override
-    public int get(int index) {
-        Validate.inclusiveBetween(0L, (long)(this.size - 1), (long)index);
+    public final int get(int index) { // Paper - make final for inline
+        //Validate.inclusiveBetween(0L, (long)(this.size - 1), (long)index);
         int i = this.cellIndex(index);
         long l = this.data[i];
         int j = (index - i * this.valuesPerLong) * this.bits;
diff --git a/src/main/java/net/minecraft/util/ZeroBitStorage.java b/src/main/java/net/minecraft/util/ZeroBitStorage.java
index 172e7a0761724cc802387e613258830a0defb04a..9686ce7536c9924b1b2aced4f013f46759cbc72e 100644
--- a/src/main/java/net/minecraft/util/ZeroBitStorage.java
+++ b/src/main/java/net/minecraft/util/ZeroBitStorage.java
@@ -13,21 +13,21 @@ public class ZeroBitStorage implements BitStorage {
     }
 
     @Override
-    public int getAndSet(int index, int value) {
-        Validate.inclusiveBetween(0L, (long)(this.size - 1), (long)index);
-        Validate.inclusiveBetween(0L, 0L, (long)value);
+    public final int getAndSet(int index, int value) { // Paper - make final for inline
+        //Validate.inclusiveBetween(0L, (long)(this.size - 1), (long)index); // Paper
+        //Validate.inclusiveBetween(0L, 0L, (long)value); // Paper
         return 0;
     }
 
     @Override
-    public void set(int index, int value) {
-        Validate.inclusiveBetween(0L, (long)(this.size - 1), (long)index);
-        Validate.inclusiveBetween(0L, 0L, (long)value);
+    public final void set(int index, int value) { // Paper - make final for inline
+        //Validate.inclusiveBetween(0L, (long)(this.size - 1), (long)index); // Paper
+        //Validate.inclusiveBetween(0L, 0L, (long)value); // Paper
     }
 
     @Override
-    public int get(int index) {
-        Validate.inclusiveBetween(0L, (long)(this.size - 1), (long)index);
+    public final int get(int index) { // Paper - make final for inline
+        //Validate.inclusiveBetween(0L, (long)(this.size - 1), (long)index); // Paper
         return 0;
     }