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Paper/Spigot-Server-Patches/0449-Optimise-ArraySetSorted-removeIf.patch
Daniel Ennis c97ce029e9
1.16.2 Release (#4123)
PaperMC believes that 1.16.2 is now ready for general release as we fixed the main issue plagueing the 1.16.x release, the MapLike data conversion issues.

Until now, it was not safe for a server to convert a world to 1.16.2 without data conversion issues around villages and potentially other things. If you did, those MapLike errors meant something went wrong.

This is now resolved.

Big thanks to all those that helped, notably @BillyGalbreath and @Proximyst who did large parts of the update process with me.

Please as always, backup your worlds and test before updating to 1.16.2!

If you update to 1.16.2, there is no going back to an older build than this.

---------------------------------

Co-authored-by: William Blake Galbreath <Blake.Galbreath@GMail.com>
Co-authored-by: Mariell Hoversholm <proximyst@proximyst.com>
Co-authored-by: krolik-exe <69214078+krolik-exe@users.noreply.github.com>
Co-authored-by: BillyGalbreath <BillyGalbreath@users.noreply.github.com>
Co-authored-by: stonar96 <minecraft.stonar96@gmail.com>
Co-authored-by: Shane Freeder <theboyetronic@gmail.com>
Co-authored-by: Jason <jasonpenilla2@me.com>
Co-authored-by: kashike <kashike@vq.lc>
Co-authored-by: Aurora <21148213+aurorasmiles@users.noreply.github.com>
Co-authored-by: KennyTV <kennytv@t-online.de>
Co-authored-by: commandblockguy <commandblockguy1@gmail.com>
Co-authored-by: DigitalRegent <misterwener@gmail.com>
Co-authored-by: ishland <ishlandmc@yeah.net>
2020-08-24 22:40:19 -04:00

66 Zeilen
2.5 KiB
Diff

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Wed, 15 Apr 2020 18:23:28 -0700
Subject: [PATCH] Optimise ArraySetSorted#removeIf
Remove iterator allocation and ensure the call is always O(n)
diff --git a/src/main/java/net/minecraft/server/ArraySetSorted.java b/src/main/java/net/minecraft/server/ArraySetSorted.java
index 85f799a713db0c822d46b689010f9f6bd43f5280..7db6b5850b91588eb4d91f0d7e8b5dbbcb95b7cb 100644
--- a/src/main/java/net/minecraft/server/ArraySetSorted.java
+++ b/src/main/java/net/minecraft/server/ArraySetSorted.java
@@ -10,8 +10,8 @@ import java.util.NoSuchElementException;
public class ArraySetSorted<T> extends AbstractSet<T> {
private final Comparator<T> a;
- private T[] b;
- private int c;
+ private T[] b; private final T[] getBackingArray() { return this.b; } // Paper - OBFHELPER
+ private int c; private final int getSize() { return this.c; } private final void setSize(int value) { this.c = value; } // Paper - OBFHELPER
private ArraySetSorted(int i, Comparator<T> comparator) {
this.a = comparator;
@@ -22,6 +22,42 @@ public class ArraySetSorted<T> extends AbstractSet<T> {
}
}
+ // Paper start - optimise removeIf
+ @Override
+ public boolean removeIf(java.util.function.Predicate<? super T> filter) {
+ // prev. impl used an iterator, which could be n^2 and creates garbage
+ int i = 0, len = this.getSize();
+ T[] backingArray = this.getBackingArray();
+
+ for (;;) {
+ if (i >= len) {
+ return false;
+ }
+ if (!filter.test(backingArray[i])) {
+ ++i;
+ continue;
+ }
+ break;
+ }
+
+ // we only want to write back to backingArray if we really need to
+
+ int lastIndex = i; // this is where new elements are shifted to
+
+ for (; i < len; ++i) {
+ T curr = backingArray[i];
+ if (!filter.test(curr)) { // if test throws we're screwed
+ backingArray[lastIndex++] = curr;
+ }
+ }
+
+ // cleanup end
+ Arrays.fill(backingArray, lastIndex, len, null);
+ this.setSize(lastIndex);
+ return true;
+ }
+ // Paper end - optimise removeIf
+
public static <T extends Comparable<T>> ArraySetSorted<T> a(int i) {
return new ArraySetSorted<>(i, (Comparator)Comparator.naturalOrder()); // Paper - decompile fix
}