PaperMC/patches/server/0083-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 dea4f322f750a0a09407fdb48d5d6e809dfe8ed4..9f438d9c6eb05e43d24e4af68188a3d4c46a938c 100644
--- a/src/main/java/net/minecraft/util/SimpleBitStorage.java
+++ b/src/main/java/net/minecraft/util/SimpleBitStorage.java
@@ -204,8 +204,8 @@ 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 - Perf: Optimize SimpleBitStorage; referenced in b(int) with 2 Integer.toUnsignedLong calls
+    private final int divideAdd; private final long divideAddUnsigned; // Paper - Perf: Optimize SimpleBitStorage
     private final int divideShift;
 
     public SimpleBitStorage(int elementBits, int size, int[] data) {
@@ -248,8 +248,8 @@ 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 - Perf: Optimize SimpleBitStorage
+        this.divideAdd = MAGIC[i + 1]; this.divideAddUnsigned = Integer.toUnsignedLong(this.divideAdd); // Paper - Perf: Optimize SimpleBitStorage
         this.divideShift = MAGIC[i + 2];
         int j = (size + this.valuesPerLong - 1) / this.valuesPerLong;
         if (data != null) {
@@ -264,15 +264,15 @@ 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 - Perf: Optimize SimpleBitStorage
+        //long m = Integer.toUnsignedLong(this.divideAdd); // Paper - Perf: Optimize SimpleBitStorage
+        return (int) (index * this.divideMulUnsigned + this.divideAddUnsigned >> 32 >> this.divideShift); // Paper - Perf: Optimize SimpleBitStorage
     }
 
     @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 - Perf: Optimize SimpleBitStorage
+        //Validate.inclusiveBetween(0L, (long)(this.size - 1), (long)index); // Paper - Perf: Optimize SimpleBitStorage
+        //Validate.inclusiveBetween(0L, this.mask, (long)value); // Paper - Perf: Optimize SimpleBitStorage
         int i = this.cellIndex(index);
         long l = this.data[i];
         int j = (index - i * this.valuesPerLong) * this.bits;
@@ -282,9 +282,9 @@ 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 - Perf: Optimize SimpleBitStorage
+        //Validate.inclusiveBetween(0L, (long)(this.size - 1), (long)index); // Paper - Perf: Optimize SimpleBitStorage
+        //Validate.inclusiveBetween(0L, this.mask, (long)value); // Paper - Perf: Optimize SimpleBitStorage
         int i = this.cellIndex(index);
         long l = this.data[i];
         int j = (index - i * this.valuesPerLong) * this.bits;
@@ -292,8 +292,8 @@ 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 - Perf: Optimize SimpleBitStorage
+        //Validate.inclusiveBetween(0L, (long)(this.size - 1), (long)index); // Paper - Perf: Optimize SimpleBitStorage
         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 8dd5a5899e9b5d8b3f1a6064dd7c1580313da69e..50040c497a819cd1229042ab3cb057d34a32cacc 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 - Perf: Optimize SimpleBitStorage
+        //Validate.inclusiveBetween(0L, (long)(this.size - 1), (long)index); // Paper - Perf: Optimize SimpleBitStorage
+        //Validate.inclusiveBetween(0L, 0L, (long)value); // Paper - Perf: Optimize SimpleBitStorage
         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 - Perf: Optimize SimpleBitStorage
+        //Validate.inclusiveBetween(0L, (long)(this.size - 1), (long)index); // Paper - Perf: Optimize SimpleBitStorage
+        //Validate.inclusiveBetween(0L, 0L, (long)value); // Paper - Perf: Optimize SimpleBitStorage
     }
 
     @Override
-    public int get(int index) {
-        Validate.inclusiveBetween(0L, (long)(this.size - 1), (long)index);
+    public final int get(int index) { // Paper - Perf: Optimize SimpleBitStorage
+        //Validate.inclusiveBetween(0L, (long)(this.size - 1), (long)index); // Paper - Perf: Optimize SimpleBitStorage
         return 0;
     }