From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Martijn Muijsers <martijnmuijsers@live.nl>
Date: Sun, 25 Dec 2022 20:51:32 +0100
Subject: [PATCH] Optimize identical item checks

License: AGPL-3.0 (https://www.gnu.org/licenses/agpl-3.0.html)
Gale - https://galemc.org

diff --git a/src/main/java/net/minecraft/world/item/ItemStack.java b/src/main/java/net/minecraft/world/item/ItemStack.java
index b1a01ef0090718923aff4365d8e93c776a5ebae4..c2160103d34c07f27cccf94613b9ae34dcd0c154 100644
--- a/src/main/java/net/minecraft/world/item/ItemStack.java
+++ b/src/main/java/net/minecraft/world/item/ItemStack.java
@@ -705,14 +705,29 @@ public final class ItemStack {
     }
 
     public static boolean tagMatches(ItemStack left, ItemStack right) {
+        // Gale start - optimize identical item checks
+        if (left == right) {
+            return true;
+        }
+        // Gale end - optimize identical item checks
         return left.isEmpty() && right.isEmpty() ? true : (!left.isEmpty() && !right.isEmpty() ? (left.tag == null && right.tag != null ? false : left.tag == null || left.tag.equals(right.tag)) : false);
     }
 
     public static boolean matches(ItemStack left, ItemStack right) {
+        // Gale start - optimize identical item checks
+        if (left == right) {
+            return true;
+        }
+        // Gale end - optimize identical item checks
         return left.isEmpty() && right.isEmpty() ? true : (!left.isEmpty() && !right.isEmpty() ? left.matches(right) : false);
     }
 
     private boolean matches(ItemStack stack) {
+        // Gale start - optimize identical item checks
+        if (this == stack) {
+            return true;
+        }
+        // Gale end - optimize identical item checks
         return this.count != stack.count ? false : (!this.is(stack.getItem()) ? false : (this.tag == null && stack.tag != null ? false : this.tag == null || this.tag.equals(stack.tag)));
     }