Paper/patches/server/0072-Optimize-isInWorldBounds-and-getBlockState-for-inlin.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Thu, 3 Mar 2016 02:07:55 -0600
Subject: [PATCH] Optimize isInWorldBounds and getBlockState for inlining

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/core/Vec3i.java b/src/main/java/net/minecraft/core/Vec3i.java
index 543d5a67e76a3114f6eac29a053ff04ceecb6256..cf7cbab325865c8e0d114187a5a15f7345ec7f89 100644
--- a/src/main/java/net/minecraft/core/Vec3i.java
+++ b/src/main/java/net/minecraft/core/Vec3i.java
@@ -33,6 +33,12 @@ public class Vec3i implements Comparable<Vec3i> {
         return CODEC.flatXmap(checkOffsetAxes(maxAbsValue), checkOffsetAxes(maxAbsValue));
     }
 
+    // Paper start
+    public final boolean isInsideBuildHeightAndWorldBoundsHorizontal(net.minecraft.world.level.LevelHeightAccessor levelHeightAccessor) {
+        return getX() >= -30000000 && getZ() >= -30000000 && getX() < 30000000 && getZ() < 30000000 && !levelHeightAccessor.isOutsideBuildHeight(getY());
+    }
+    // Paper end
+
     public Vec3i(int x, int y, int z) {
         this.x = x;
         this.y = y;
diff --git a/src/main/java/net/minecraft/world/level/Level.java b/src/main/java/net/minecraft/world/level/Level.java
index de1bb9ecb8891b66b2c469f2ee52b9eee9d7ddea..c28285ab7e698a214aea6ff4a5ff6d4f8b8b52bd 100644
--- a/src/main/java/net/minecraft/world/level/Level.java
+++ b/src/main/java/net/minecraft/world/level/Level.java
@@ -263,7 +263,7 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
     }
 
     public boolean isInWorldBounds(BlockPos pos) {
-        return !this.isOutsideBuildHeight(pos) && Level.isInWorldBoundsHorizontal(pos);
+        return pos.isInsideBuildHeightAndWorldBoundsHorizontal(this); // Paper - use better/optimized check
     }
 
     public static boolean isInSpawnableBounds(BlockPos pos) {
diff --git a/src/main/java/net/minecraft/world/level/chunk/ChunkAccess.java b/src/main/java/net/minecraft/world/level/chunk/ChunkAccess.java
index 0ea0690ab1d45f60a2b13cf8a69e580256992cdc..b3b3fa7ece66e1ab467c8ed550d150db541fd02a 100644
--- a/src/main/java/net/minecraft/world/level/chunk/ChunkAccess.java
+++ b/src/main/java/net/minecraft/world/level/chunk/ChunkAccess.java
@@ -119,6 +119,7 @@ public abstract class ChunkAccess implements BlockGetter, BiomeManager.NoiseBiom
         return GameEventDispatcher.NOOP;
     }
 
+    public abstract BlockState getBlockState(final int x, final int y, final int z); // Paper
     @Nullable
     public abstract BlockState setBlockState(BlockPos pos, BlockState state, boolean moved);
 
diff --git a/src/main/java/net/minecraft/world/level/chunk/EmptyLevelChunk.java b/src/main/java/net/minecraft/world/level/chunk/EmptyLevelChunk.java
index 31d01f8df394e718f1f2a268ddccee77b6706eb9..7b0da3956be23e974d3bc2f50f9004046923635f 100644
--- a/src/main/java/net/minecraft/world/level/chunk/EmptyLevelChunk.java
+++ b/src/main/java/net/minecraft/world/level/chunk/EmptyLevelChunk.java
@@ -18,6 +18,12 @@ public class EmptyLevelChunk extends LevelChunk {
         super(world, pos);
     }
 
+    // Paper start
+    @Override
+    public BlockState getBlockState(int x, int y, int z) {
+        return Blocks.VOID_AIR.defaultBlockState();
+    }
+    // Paper end
     @Override
     public BlockState getBlockState(BlockPos pos) {
         return Blocks.VOID_AIR.defaultBlockState();
diff --git a/src/main/java/net/minecraft/world/level/chunk/ImposterProtoChunk.java b/src/main/java/net/minecraft/world/level/chunk/ImposterProtoChunk.java
index ef74f37cae96e61d5648fce7bbd793fb67ba9e4a..e15263a152c88371ebc65b47f0be938f7c19a8f2 100644
--- a/src/main/java/net/minecraft/world/level/chunk/ImposterProtoChunk.java
+++ b/src/main/java/net/minecraft/world/level/chunk/ImposterProtoChunk.java
@@ -46,6 +46,12 @@ public class ImposterProtoChunk extends ProtoChunk {
     public BlockState getBlockState(BlockPos pos) {
         return this.wrapped.getBlockState(pos);
     }
+    // Paper start
+    @Override
+    public final BlockState getBlockState(final int x, final int y, final int z) {
+        return this.wrapped.getBlockStateFinal(x, y, z);
+    }
+    // Paper end
 
     @Override
     public FluidState getFluidState(BlockPos pos) {
diff --git a/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java b/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
index f9fbe225cc11b2bafa733e92d9537aaa7c1e007b..78cb2d16654cd679531bba9d7d9d0cb810e689e2 100644
--- a/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
+++ b/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
@@ -288,12 +288,29 @@ public class LevelChunk extends ChunkAccess {
         });
     }
 
+    // Paper start - Optimize getBlockData to reduce instructions
     @Override
     public BlockState getBlockState(BlockPos pos) {
-        int i = pos.getX();
-        int j = pos.getY();
-        int k = pos.getZ();
+        return this.getBlockStateFinal(pos.getX(), pos.getY(), pos.getZ());
+    }
+
+    @Override
+    public BlockState getBlockState(final int x, final int y, final int z) {
+        return this.getBlockStateFinal(x, y, z);
+    }
+    public final BlockState getBlockStateFinal(final int x, final int y, final int z) {
+        // Method body / logic copied from below
+        final int i = this.getSectionIndex(y);
+        if (i < 0 || i >= this.sections.length || this.sections[i].nonEmptyBlockCount == 0 || this.sections[i].hasOnlyAir()) {
+            return Blocks.AIR.defaultBlockState();
+        }
+        // Inlined ChunkSection.getType() and DataPaletteBlock.a(int,int,int)
+        return this.sections[i].states.get((y & 15) << 8 | (z & 15) << 4 | x & 15);
 
+    }
+
+    public BlockState getBlockState_unused(int i, int j, int k) {
+        // Paper end
         if (this.level.isDebug()) {
             BlockState iblockdata = null;
 
diff --git a/src/main/java/net/minecraft/world/level/chunk/LevelChunkSection.java b/src/main/java/net/minecraft/world/level/chunk/LevelChunkSection.java
index 6abd3cf0a388b158252628d8031b92bb8a6d65fb..50b6ecfea7a342be0d21e37ae87777a4b4860026 100644
--- a/src/main/java/net/minecraft/world/level/chunk/LevelChunkSection.java
+++ b/src/main/java/net/minecraft/world/level/chunk/LevelChunkSection.java
@@ -20,7 +20,7 @@ public class LevelChunkSection {
     public static final int SECTION_SIZE = 4096;
     public static final int BIOME_CONTAINER_BITS = 2;
     private final int bottomBlockY;
-    private short nonEmptyBlockCount;
+    short nonEmptyBlockCount; // Paper - package-private
     private short tickingBlockCount;
     private short tickingFluidCount;
     public final PalettedContainer<BlockState> states;
diff --git a/src/main/java/net/minecraft/world/level/chunk/ProtoChunk.java b/src/main/java/net/minecraft/world/level/chunk/ProtoChunk.java
index b7dbdcb0ce7948c6f98ec67d0cf2033a8e348085..150dd90598bbe4057b4e9ad17c87a4c07af3d56d 100644
--- a/src/main/java/net/minecraft/world/level/chunk/ProtoChunk.java
+++ b/src/main/java/net/minecraft/world/level/chunk/ProtoChunk.java
@@ -87,14 +87,18 @@ public class ProtoChunk extends ChunkAccess {
 
     @Override
     public BlockState getBlockState(BlockPos pos) {
-        int i = pos.getY();
-        if (this.isOutsideBuildHeight(i)) {
+        // Paper start
+        return getBlockState(pos.getX(), pos.getY(), pos.getZ());
+    }
+    public BlockState getBlockState(final int x, final int y, final int z) {
+        if (this.isOutsideBuildHeight(y)) {
             return Blocks.VOID_AIR.defaultBlockState();
         } else {
-            LevelChunkSection levelChunkSection = this.getSection(this.getSectionIndex(i));
-            return levelChunkSection.hasOnlyAir() ? Blocks.AIR.defaultBlockState() : levelChunkSection.getBlockState(pos.getX() & 15, i & 15, pos.getZ() & 15);
+            LevelChunkSection levelChunkSection = this.getSections()[this.getSectionIndex(y)];
+            return levelChunkSection.hasOnlyAir() ? Blocks.AIR.defaultBlockState() : levelChunkSection.getBlockState(x & 15, y & 15, z & 15);
         }
     }
+    // Paper end
 
     @Override
     public FluidState getFluidState(BlockPos pos) {