From d4364f50671372762e805a576f9d1ac2c43add24 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 a3b5793e48..71089442c1 100644
--- a/src/main/java/net/minecraft/server/BaseBlockPosition.java
+++ b/src/main/java/net/minecraft/server/BaseBlockPosition.java
@@ -13,6 +13,14 @@ public class BaseBlockPosition implements Comparable<BaseBlockPosition> {
     private final int b;
     @Deprecated
     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/Chunk.java b/src/main/java/net/minecraft/server/Chunk.java
index 6ed23ea6c8..7033c6e839 100644
--- a/src/main/java/net/minecraft/server/Chunk.java
+++ b/src/main/java/net/minecraft/server/Chunk.java
@@ -208,12 +208,24 @@ 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 652067757a..0d5deee365 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;
 
     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 0d403ec707..d81178d26d 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -167,11 +167,11 @@ public abstract class World implements GeneratorAccess, AutoCloseable {
     }
 
     public static boolean isValidLocation(BlockPosition blockposition) {
-        return !isOutsideWorld(blockposition) && blockposition.getX() >= -30000000 && blockposition.getZ() >= -30000000 && blockposition.getX() < 30000000 && blockposition.getZ() < 30000000;
+        return blockposition.isValidLocation();
     }
 
     public static boolean isOutsideWorld(BlockPosition blockposition) {
-        return b(blockposition.getY());
+        return blockposition.isInvalidYLocation();
     }
 
     public static boolean b(int i) {
-- 
2.25.0