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68 lines
2.8 KiB
Diff
68 lines
2.8 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Andrew Steinborn <git@steinborn.me>
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Date: Mon, 23 Jul 2018 13:08:19 -0400
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Subject: [PATCH] Optimize IntIdentityHashBiMiap#nextId()
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Optimizes CrudeIncrementalIntIdentityHashBiMap#nextId()
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This is a frequent hotspot for world loading/saving.
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1.18 note: seems like the bitset is too small now? removing this patch fixed
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lots of issues related to synchedentitydata and structure gen. when asked, Tux said "nuke it"
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diff --git a/src/main/java/net/minecraft/util/CrudeIncrementalIntIdentityHashBiMap.java b/src/main/java/net/minecraft/util/CrudeIncrementalIntIdentityHashBiMap.java
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index dc7528b41aa9a55807a2b3e33d5668e1be681e79..a002218caed08bf4a4072d934e1094c22ee35534 100644
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--- a/src/main/java/net/minecraft/util/CrudeIncrementalIntIdentityHashBiMap.java
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+++ b/src/main/java/net/minecraft/util/CrudeIncrementalIntIdentityHashBiMap.java
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@@ -16,11 +16,13 @@ public class CrudeIncrementalIntIdentityHashBiMap<K> implements IdMap<K> {
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private K[] byId;
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private int nextId;
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private int size;
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+ private java.util.BitSet usedIds; // Paper
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private CrudeIncrementalIntIdentityHashBiMap(int size) {
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this.keys = (K[])(new Object[size]);
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this.values = new int[size];
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this.byId = (K[])(new Object[size]);
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+ this.usedIds = new java.util.BitSet(); // Paper
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}
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public static <A> CrudeIncrementalIntIdentityHashBiMap<A> create(int expectedSize) {
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@@ -57,9 +59,13 @@ public class CrudeIncrementalIntIdentityHashBiMap<K> implements IdMap<K> {
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}
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private int nextId() {
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+ /* // Paper start
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while(this.nextId < this.byId.length && this.byId[this.nextId] != null) {
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++this.nextId;
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}
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+ */
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+ this.nextId = this.usedIds.nextClearBit(0);
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+ // Paper end
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return this.nextId;
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}
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@@ -80,6 +86,7 @@ public class CrudeIncrementalIntIdentityHashBiMap<K> implements IdMap<K> {
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this.byId = crudeIncrementalIntIdentityHashBiMap.byId;
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this.nextId = crudeIncrementalIntIdentityHashBiMap.nextId;
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this.size = crudeIncrementalIntIdentityHashBiMap.size;
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+ this.usedIds.clear(); // Paper
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}
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public void addMapping(K value, int id) {
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@@ -96,6 +103,7 @@ public class CrudeIncrementalIntIdentityHashBiMap<K> implements IdMap<K> {
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this.keys[k] = value;
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this.values[k] = id;
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this.byId[id] = value;
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+ this.usedIds.set(id); // Paper
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++this.size;
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if (id == this.nextId) {
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++this.nextId;
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@@ -157,6 +165,7 @@ public class CrudeIncrementalIntIdentityHashBiMap<K> implements IdMap<K> {
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Arrays.fill(this.byId, (Object)null);
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this.nextId = 0;
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this.size = 0;
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+ this.usedIds.clear(); // Paper
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}
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@Override
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