PaperMC/Spigot-Server-Patches/0082-Optimize-isValidLocation-getType-and-getBlockData-fo.patch

From 6ebe7f1a09ee9925c972a7800d3c654e3d86695e 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 e2a7b4be2..58f8b4b72 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 279045e49..7122a9aa8 100644
--- a/src/main/java/net/minecraft/server/BlockPosition.java
+++ b/src/main/java/net/minecraft/server/BlockPosition.java
@@ -338,6 +338,16 @@ 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 32c1dbd0b..5d1812ab0 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 7c6308dbe..880058a9e 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 11cf087e7..489c152ee 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;
@@ -669,11 +669,11 @@ 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);
@@ -700,7 +700,7 @@ 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);
@@ -710,7 +710,7 @@ 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);
@@ -1768,7 +1768,7 @@ 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
@@ -1809,7 +1809,7 @@ 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) {
@@ -1870,7 +1870,7 @@ 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