PaperMC/Spigot-Server-Patches/Reduce-MutableInt-allocations-from-light-engine.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <spottedleaf@spottedleaf.dev>
Date: Mon, 27 Apr 2020 02:48:06 -0700
Subject: [PATCH] Reduce MutableInt allocations from light engine


diff --git a/src/main/java/net/minecraft/server/LightEngineBlock.java b/src/main/java/net/minecraft/server/LightEngineBlock.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/server/LightEngineBlock.java
+++ b/src/main/java/net/minecraft/server/LightEngineBlock.java
@@ -0,0 +0,0 @@ public final class LightEngineBlock extends LightEngineLayer<LightEngineStorageB
             if (enumdirection == null) {
                 return 15;
             } else {
-                MutableInt mutableint = new MutableInt();
+                // Paper start - reduce mutableint allocations
+                MutableInt mutableint = com.destroystokyo.paper.util.pooled.PooledObjects.POOLED_MUTABLE_INTEGERS.acquire();
+                try {
+                // Paper end - reduce mutableint allocations
                 IBlockData iblockdata = this.a(j, mutableint);
 
                 if (mutableint.getValue() >= 15) {
@@ -0,0 +0,0 @@ public final class LightEngineBlock extends LightEngineLayer<LightEngineStorageB
 
                     return VoxelShapes.b(voxelshape, voxelshape1) ? 15 : k + Math.max(1, mutableint.getValue());
                 }
+                } finally { // Paper start - reduce mutableint allocations
+                    com.destroystokyo.paper.util.pooled.PooledObjects.POOLED_MUTABLE_INTEGERS.release(mutableint);
+                }
+                // Paper end - reduce mutableint allocations
             }
         }
     }
diff --git a/src/main/java/net/minecraft/server/LightEngineSky.java b/src/main/java/net/minecraft/server/LightEngineSky.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/server/LightEngineSky.java
+++ b/src/main/java/net/minecraft/server/LightEngineSky.java
@@ -0,0 +0,0 @@ public final class LightEngineSky extends LightEngineLayer<LightEngineStorageSky
             if (k >= 15) {
                 return k;
             } else {
-                MutableInt mutableint = new MutableInt();
+                // Paper start - reduce mutableint allocations
+                MutableInt mutableint = com.destroystokyo.paper.util.pooled.PooledObjects.POOLED_MUTABLE_INTEGERS.acquire();
+                try {
+                // Paper end - reduce mutableint allocations
                 IBlockData iblockdata = this.a(j, mutableint);
 
                 if (mutableint.getValue() >= 15) {
@@ -0,0 +0,0 @@ public final class LightEngineSky extends LightEngineLayer<LightEngineStorageSky
 
                     return flag1 && k == 0 && mutableint.getValue() == 0 ? 0 : k + Math.max(1, mutableint.getValue());
                 }
+                } finally { // Paper start - reduce mutableint allocations
+                    com.destroystokyo.paper.util.pooled.PooledObjects.POOLED_MUTABLE_INTEGERS.release(mutableint);
+                }
+                // Paper end - reduce mutableint allocations
             }
         }
     }