From 80bdfb8b3bf944ed05a1c28816568bde9e05709c Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Thu, 3 Mar 2016 02:07:55 -0600
Subject: [PATCH] Optimize getBlockData

Hot method, so reduce # of instructions for the method.

diff --git a/src/main/java/net/minecraft/server/Chunk.java b/src/main/java/net/minecraft/server/Chunk.java
index 3b5e8c2..42fedb7 100644
--- a/src/main/java/net/minecraft/server/Chunk.java
+++ b/src/main/java/net/minecraft/server/Chunk.java
@@ -403,8 +403,15 @@ public class Chunk {
         return this.a(i, j, k).c();
     }
 
+    // Paper - Optimize getBlockData
     public IBlockData getBlockData(BlockPosition blockposition) {
-        return this.a(blockposition.getX(), blockposition.getY(), blockposition.getZ());
+        if (blockposition.getY() >= 0 && blockposition.getY() >> 4 < this.sections.length) {
+            ChunkSection chunksection = this.sections[blockposition.getY() >> 4];
+            if (chunksection != null) {
+                return chunksection.getType(blockposition.getX() & 15, blockposition.getY() & 15, blockposition.getZ() & 15);
+            }
+        }
+        return Blocks.AIR.getBlockData();
     }
 
     public IBlockData a(final int i, final int j, final int k) {
-- 
2.8.0