From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: violetc <58360096+s-yh-china@users.noreply.github.com>
Date: Wed, 17 Aug 2022 10:48:18 +0800
Subject: [PATCH] Reduce entity allocations

This patch is Powered by Pufferfish(https://github.com/pufferfish-gg/Pufferfish)

diff --git a/src/main/java/net/minecraft/world/entity/Entity.java b/src/main/java/net/minecraft/world/entity/Entity.java
index a20930d2c09005a210e5242401cfb2e6c6082a01..2d8af400a75324b57bae87ceaee79e74da180cbd 100644
--- a/src/main/java/net/minecraft/world/entity/Entity.java
+++ b/src/main/java/net/minecraft/world/entity/Entity.java
@@ -413,6 +413,8 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource {
         return this.originWorld;
     }
     // Paper end
+    // public final BlockPos.MutableBlockPos cachedBlockPos = new BlockPos.MutableBlockPos(); // Leaves - used where needed ?
+
     public float getBukkitYaw() {
         return this.yRot;
     }
diff --git a/src/main/java/net/minecraft/world/entity/ai/attributes/AttributeMap.java b/src/main/java/net/minecraft/world/entity/ai/attributes/AttributeMap.java
index c770ee21b7b699522941f6a1584d532001c04082..a0672f21797ff90e8bb6b16d3aaa671b317d6912 100644
--- a/src/main/java/net/minecraft/world/entity/ai/attributes/AttributeMap.java
+++ b/src/main/java/net/minecraft/world/entity/ai/attributes/AttributeMap.java
@@ -22,9 +22,11 @@ public class AttributeMap {
     private final Map<Attribute, AttributeInstance> attributes = Maps.newHashMap();
     private final Set<AttributeInstance> dirtyAttributes = Sets.newHashSet();
     private final AttributeSupplier supplier;
+    private final java.util.function.Function<Attribute, AttributeInstance> createInstance; // Leaves - reduce entity allocations
 
     public AttributeMap(AttributeSupplier defaultAttributes) {
         this.supplier = defaultAttributes;
+        this.createInstance = attribute -> this.supplier.createInstance(this::onAttributeModified, attribute);
     }
 
     private void onAttributeModified(AttributeInstance instance) {
@@ -46,9 +48,15 @@ public class AttributeMap {
 
     @Nullable
     public AttributeInstance getInstance(Attribute attribute) {
-        return this.attributes.computeIfAbsent(attribute, (attributex) -> {
-            return this.supplier.createInstance(this::onAttributeModified, attributex);
-        });
+        // Leaves start - cache lambda, as for some reason java allocates it anyways
+        if (top.leavesmc.leaves.LeavesConfig.reduceEntityAllocations) {
+            return this.attributes.computeIfAbsent(attribute, this.createInstance);
+        } else {
+            return this.attributes.computeIfAbsent(attribute, (attributex) -> {
+                return this.supplier.createInstance(this::onAttributeModified, attributex);
+            });
+        }
+        // Leaves end - cache lambda, as for some reason java allocates it anyways
     }
 
     public boolean hasAttribute(Attribute attribute) {
diff --git a/src/main/java/top/leavesmc/leaves/LeavesConfig.java b/src/main/java/top/leavesmc/leaves/LeavesConfig.java
index 0bba3458e6fc75a9d542691054cc255a521496c6..a557ea7adbb82dfff5c383b1d9acb8e0487fd4e9 100644
--- a/src/main/java/top/leavesmc/leaves/LeavesConfig.java
+++ b/src/main/java/top/leavesmc/leaves/LeavesConfig.java
@@ -315,6 +315,11 @@ public final class LeavesConfig {
         skipCloneLootParameters = getBoolean("settings.performance.skip-clone-loot-parameters", skipCloneLootParameters);
     }
 
+    public static boolean reduceEntityAllocations = true;
+    private static void reduceEntityAllocations() {
+        reduceEntityAllocations = getBoolean("settings.performance.reduce-entity-allocations", reduceEntityAllocations);
+    }
+
     public static final class WorldConfig {
 
         public final String worldName;