PaperMC/Spigot-Server-Patches/0072-Optimize-isValidLocation-getType-and-getBlockData-fo.patch

From de45b3395d8c937c9c5a38717db7edda3f800c6a Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Thu, 3 Mar 2016 02:07:55 -0600
Subject: [PATCH] Optimize isValidLocation, getType and getBlockData for inling

Hot methods, so reduce # of instructions for the method.

Move is valid location test to the BlockPosition class so that it can access local variables.

Replace all calls to the new place to the unnecessary forward.

Optimize getType and getBlockData to manually inline and optimize the calls

diff --git a/src/main/java/net/minecraft/server/BaseBlockPosition.java b/src/main/java/net/minecraft/server/BaseBlockPosition.java
index 2852a17f23..7cb46d7a9c 100644
--- a/src/main/java/net/minecraft/server/BaseBlockPosition.java
+++ b/src/main/java/net/minecraft/server/BaseBlockPosition.java
@@ -10,6 +10,14 @@ public class BaseBlockPosition implements Comparable<BaseBlockPosition> {
     private final int a;
     private final int b;
     private final int c;
+    // Paper start
+    public boolean isValidLocation() {
+        return a >= -30000000 && c >= -30000000 && a < 30000000 && c < 30000000 && b >= 0 && b < 256;
+    }
+    public boolean isInvalidYLocation() {
+        return b < 0 || b >= 256;
+    }
+    // Paper end
 
     public BaseBlockPosition(int i, int j, int k) {
         this.a = i;
diff --git a/src/main/java/net/minecraft/server/BlockPosition.java b/src/main/java/net/minecraft/server/BlockPosition.java
index 2613de6624..2eabaaeba2 100644
--- a/src/main/java/net/minecraft/server/BlockPosition.java
+++ b/src/main/java/net/minecraft/server/BlockPosition.java
@@ -339,6 +339,16 @@ public class BlockPosition extends BaseBlockPosition implements MinecraftSeriali
         protected int b;
         protected int c;
         protected int d;
+        // Paper start
+        @Override
+        public boolean isValidLocation() {
+            return b >= -30000000 && d >= -30000000 && b < 30000000 && d < 30000000 && c >= 0 && c < 256;
+        }
+        @Override
+        public boolean isInvalidYLocation() {
+            return c < 0 || c >= 256;
+        }
+        // Paper end
 
         public MutableBlockPosition() {
             this(0, 0, 0);
diff --git a/src/main/java/net/minecraft/server/Chunk.java b/src/main/java/net/minecraft/server/Chunk.java
index 4aaf20dfcb..591c823b39 100644
--- a/src/main/java/net/minecraft/server/Chunk.java
+++ b/src/main/java/net/minecraft/server/Chunk.java
@@ -203,12 +203,24 @@ public class Chunk implements IChunkAccess {
         return this.sections;
     }
 
-    @Override
+    // Paper start - Optimize getBlockData to reduce instructions
+    public final IBlockData getBlockData(BlockPosition pos) { return getBlockData(pos.getX(), pos.getY(), pos.getZ()); } // Paper
     public IBlockData getType(BlockPosition blockposition) {
-        int i = blockposition.getX();
-        int j = blockposition.getY();
-        int k = blockposition.getZ();
+        return this.getBlockData(blockposition.getX(), blockposition.getY(), blockposition.getZ());
+    }
 
+    public final IBlockData getBlockData(final int x, final int y, final int z) {
+        // Method body / logic copied from below
+        final int i = y >> 4;
+        if (y >= 0 && i < this.sections.length && this.sections[i] != null) {
+            // Inlined ChunkSection.getType() and DataPaletteBlock.a(int,int,int)
+            return this.sections[i].blockIds.a((y & 15) << 8 | (z & 15) << 4 | x & 15);
+        }
+        return Blocks.AIR.getBlockData();
+    }
+
+    public IBlockData getBlockData_unused(int i, int j, int k) {
+        // Paper end
         if (this.world.P() == WorldType.DEBUG_ALL_BLOCK_STATES) {
             IBlockData iblockdata = null;
 
diff --git a/src/main/java/net/minecraft/server/ChunkSection.java b/src/main/java/net/minecraft/server/ChunkSection.java
index f4605e3937..c4c181c1d5 100644
--- a/src/main/java/net/minecraft/server/ChunkSection.java
+++ b/src/main/java/net/minecraft/server/ChunkSection.java
@@ -9,7 +9,7 @@ public class ChunkSection {
     private short nonEmptyBlockCount;
     private short tickingBlockCount;
     private short e;
-    private final DataPaletteBlock<IBlockData> blockIds;
+    final DataPaletteBlock<IBlockData> blockIds; // Paper - package
 
     public ChunkSection(int i) {
         this(i, (short) 0, (short) 0, (short) 0);
diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
index 769d59271a..822db5d4c0 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -197,11 +197,11 @@ public abstract class World implements IIBlockAccess, GeneratorAccess, AutoClose
     }
 
     public static boolean isValidLocation(BlockPosition blockposition) {
-        return !isOutsideWorld(blockposition) && blockposition.getX() >= -30000000 && blockposition.getZ() >= -30000000 && blockposition.getX() < 30000000 && blockposition.getZ() < 30000000;
+        return blockposition.isValidLocation(); // Paper
     }
 
     public static boolean isOutsideWorld(BlockPosition blockposition) {
-        return b(blockposition.getY());
+        return blockposition.isInvalidYLocation(); // Paper
     }
 
     public static boolean b(int i) {
-- 
2.22.0