Paper/Spigot-Server-Patches/0523-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 93a972605c26aa757b9c915876f847da04fcb496..c4ba30bd56e2ead6015c0109f8e889388afeb7f2 100644
--- a/src/main/java/net/minecraft/server/LightEngineBlock.java
+++ b/src/main/java/net/minecraft/server/LightEngineBlock.java
@@ -37,7 +37,10 @@ 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) {
@@ -49,6 +52,10 @@ 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 2301a982e17ab9568e3da9ca84c4a024c7c1b214..0b4f4604f4ea444017c021768574646a8d11ba26 100644
--- a/src/main/java/net/minecraft/server/LightEngineSky.java
+++ b/src/main/java/net/minecraft/server/LightEngineSky.java
@@ -27,7 +27,10 @@ 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) {
@@ -85,6 +88,10 @@ 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
             }
         }
     }