PaperMC/Spigot-Server-Patches/0081-Optimize-isValidLocation-getType-and-getBlockData-fo.patch

From 42f660596a1ac2e6830fb330b21147014495a687 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 e2a7b4be2c..58f8b4b720 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 7dbea90902..252e00e166 100644
--- a/src/main/java/net/minecraft/server/BlockPosition.java
+++ b/src/main/java/net/minecraft/server/BlockPosition.java
@@ -341,6 +341,16 @@ public class BlockPosition extends BaseBlockPosition {
         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 ef6a54bcae..4b440c7077 100644
--- a/src/main/java/net/minecraft/server/Chunk.java
+++ b/src/main/java/net/minecraft/server/Chunk.java
@@ -430,12 +430,24 @@ public class Chunk implements IChunkAccess {
         return this.getBlockData(i, j, k).b(this.world, new BlockPosition(i, j, k));
     }
 
-    public IBlockData getBlockData(BlockPosition blockposition) { return getType(blockposition); } // Paper
+    // Paper start - Optimize getBlockData to reduce instructions
+    public IBlockData getBlockData(BlockPosition pos) { return getBlockData(pos.getX(), pos.getY(), pos.getZ()); } // Paper
     public IBlockData getType(BlockPosition blockposition) {
         return this.getBlockData(blockposition.getX(), blockposition.getY(), blockposition.getZ());
     }
 
-    public IBlockData getBlockData(int i, int j, int k) {
+    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.R() == 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 35aea4829f..233cbb6d60 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 int nonEmptyBlockCount;
     private int tickingBlockCount;
     private int e;
-    private final DataPaletteBlock<IBlockData> blockIds;
+    final DataPaletteBlock<IBlockData> blockIds; // Paper - package
     private NibbleArray emittedLight;
     private NibbleArray skyLight;
 
diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
index 72c0c92ec1..1df7528949 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -262,11 +262,11 @@ public abstract class World implements GeneratorAccess, IIBlockAccess, AutoClose
     }
 
     public static boolean isValidLocation(BlockPosition blockposition) {
-        return !k(blockposition) && blockposition.getX() >= -30000000 && blockposition.getZ() >= -30000000 && blockposition.getX() < 30000000 && blockposition.getZ() < 30000000;
+        return blockposition.isValidLocation(); // Paper
     }
 
     public static boolean k(BlockPosition blockposition) {
-        return blockposition.getY() < 0 || blockposition.getY() >= 256;
+        return blockposition.isInvalidYLocation(); // Paper
     }
 
     public boolean isEmpty(BlockPosition blockposition) {
@@ -280,7 +280,7 @@ public abstract class World implements GeneratorAccess, IIBlockAccess, AutoClose
     // test if meets light level, return faster
     // logic copied from below
     public boolean isLightLevel(BlockPosition blockposition, int level) {
-        if (isValidLocation(blockposition)) {
+        if (blockposition.isValidLocation()) {
             if (this.getType(blockposition).c(this, blockposition)) {
                 int sky = getSkylightSubtracted();
                 if (this.getLightLevel(blockposition.up(), sky) >= level) {
@@ -324,7 +324,7 @@ public abstract class World implements GeneratorAccess, IIBlockAccess, AutoClose
         // CraftBukkit end
         Chunk chunk = this.getChunkIfLoaded(blockposition);
         if (chunk != null) {
-            return isValidLocation(blockposition) ? chunk.getBlockData(blockposition) : Blocks.AIR.getBlockData();
+            return blockposition.isValidLocation() ? chunk.getBlockData(blockposition) : Blocks.AIR.getBlockData(); // Paper
         }
         return null;
     }
@@ -359,7 +359,7 @@ public abstract class World implements GeneratorAccess, IIBlockAccess, AutoClose
             return true;
         }
         // CraftBukkit end
-        if (k(blockposition)) {
+            if (blockposition.isInvalidYLocation()) { // Paper
             return false;
         } else if (!this.isClientSide && this.worldData.getType() == WorldType.DEBUG_ALL_BLOCK_STATES) {
             return false;
@@ -680,11 +680,11 @@ public abstract class World implements GeneratorAccess, IIBlockAccess, AutoClose
             blockposition = new BlockPosition(blockposition.getX(), 0, blockposition.getZ());
         }
 
-        return !isValidLocation(blockposition) ? enumskyblock.c : (!this.isLoaded(blockposition) ? enumskyblock.c : this.getChunkAtWorldCoords(blockposition).getBrightness(enumskyblock, blockposition));
+        return !blockposition.isValidLocation() ? enumskyblock.c : (!this.isLoaded(blockposition) ? enumskyblock.c : this.getChunkAtWorldCoords(blockposition).getBrightness(enumskyblock, blockposition)); // Paper
     }
 
     public void a(EnumSkyBlock enumskyblock, BlockPosition blockposition, int i) {
-        if (isValidLocation(blockposition)) {
+        if (blockposition.isValidLocation()) { // Paper
             if (this.isLoaded(blockposition)) {
                 this.getChunkAtWorldCoords(blockposition).a(enumskyblock, blockposition, i);
                 this.m(blockposition);
@@ -711,7 +711,7 @@ public abstract class World implements GeneratorAccess, IIBlockAccess, AutoClose
             }
         }
         // CraftBukkit end
-        if (k(blockposition)) {
+        if (blockposition.isInvalidYLocation()) { // Paper
             return Blocks.VOID_AIR.getBlockData();
         } else {
             Chunk chunk = this.getChunkAtWorldCoords(blockposition);
@@ -721,7 +721,7 @@ public abstract class World implements GeneratorAccess, IIBlockAccess, AutoClose
     }
 
     public Fluid b(BlockPosition blockposition) {
-        if (k(blockposition)) {
+        if (blockposition.isInvalidYLocation()) { // Paper
             return FluidTypes.a.i();
         } else {
             Chunk chunk = this.getChunkAtWorldCoords(blockposition);
@@ -1779,7 +1779,7 @@ public abstract class World implements GeneratorAccess, IIBlockAccess, AutoClose
     public Map<BlockPosition, TileEntity> capturedTileEntities = Maps.newHashMap();
     @Nullable
     public TileEntity getTileEntity(BlockPosition blockposition) {
-        if (k(blockposition)) {
+        if (blockposition.isInvalidYLocation()) { // Paper
             return null;
         } else {
             // CraftBukkit start
@@ -1820,7 +1820,7 @@ public abstract class World implements GeneratorAccess, IIBlockAccess, AutoClose
     }
 
     public void setTileEntity(BlockPosition blockposition, @Nullable TileEntity tileentity) {
-        if (!k(blockposition)) {
+        if (!blockposition.isInvalidYLocation()) { // Paper
             if (tileentity != null && !tileentity.x()) {
                 // CraftBukkit start
                 if (captureBlockStates) {
@@ -1881,7 +1881,7 @@ public abstract class World implements GeneratorAccess, IIBlockAccess, AutoClose
     }
 
     public boolean p(BlockPosition blockposition) {
-        if (k(blockposition)) {
+        if (blockposition.isInvalidYLocation()) { // Paper
             return false;
         } else {
             Chunk chunk = this.chunkProvider.getLoadedChunkAt(blockposition.getX() >> 4, blockposition.getZ() >> 4);
-- 
2.18.0