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

From ad7babe3efdc1b799a999c0fcf8e4d3f49344752 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 a3b5793e4..71089442c 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 f3d20f214..ee94f59e6 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 652067757..0d5deee36 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 c2039d0e4..502da7f52 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -171,11 +171,11 @@ 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