Paper/Spigot-Server-Patches/0445-Optimise-Chunk-getFluid.patch

From f0bf987e53c7aa744047a0cd70b3b506897a7998 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Tue, 14 Jan 2020 14:59:08 -0800
Subject: [PATCH] Optimise Chunk#getFluid

Removing the try catch and generally reducing ops should make it
faster on its own, however removing the try catch makes it
easier to inline due to code size

diff --git a/src/main/java/net/minecraft/server/Chunk.java b/src/main/java/net/minecraft/server/Chunk.java
index 2e3db1a755..d802acef71 100644
--- a/src/main/java/net/minecraft/server/Chunk.java
+++ b/src/main/java/net/minecraft/server/Chunk.java
@@ -365,17 +365,20 @@ public class Chunk implements IChunkAccess {
     }
 
     public Fluid a(int i, int j, int k) {
-        try {
-            if (j >= 0 && j >> 4 < this.sections.length) {
-                ChunkSection chunksection = this.sections[j >> 4];
-
-                if (!ChunkSection.a(chunksection)) {
-                    return chunksection.b(i & 15, j & 15, k & 15);
+        //try {  // Paper - remove try catch
+        // Paper start - reduce the number of ops in this call
+        int index = j >> 4;
+            if (index >= 0 && index < this.sections.length) {
+                ChunkSection chunksection = this.sections[index];
+
+                if (chunksection != null) {
+                    return chunksection.blockIds.a((j & 15) << 8 | (k & 15) << 4 | i & 15).getFluid();
                 }
+                // Paper end
             }
 
             return FluidTypes.EMPTY.h();
-        } catch (Throwable throwable) {
+        /*} catch (Throwable throwable) { // Paper - remove try catch
             CrashReport crashreport = CrashReport.a(throwable, "Getting fluid state");
             CrashReportSystemDetails crashreportsystemdetails = crashreport.a("Block being got");
 
@@ -384,6 +387,7 @@ public class Chunk implements IChunkAccess {
             });
             throw new ReportedException(crashreport);
         }
+         */  // Paper - remove try catch
     }
 
     // CraftBukkit start
diff --git a/src/main/java/net/minecraft/server/ChunkSection.java b/src/main/java/net/minecraft/server/ChunkSection.java
index 3eaf893cdf..cda718bba0 100644
--- a/src/main/java/net/minecraft/server/ChunkSection.java
+++ b/src/main/java/net/minecraft/server/ChunkSection.java
@@ -46,7 +46,7 @@ public class ChunkSection {
     }
 
     public Fluid b(int i, int j, int k) {
-        return ((IBlockData) this.blockIds.a(i, j, k)).getFluid();
+        return ((IBlockData) this.blockIds.a(i, j, k)).getFluid(); // Paper - diff on change - we expect this to be effectively just getType(x, y, z).getFluid(). If this changes we need to check other patches that use IBlockData#getFluid.
     }
 
     public void a() {
-- 
2.26.2