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da9d110d5b
This patch does not appear to be doing anything useful, and may hide errors. Currently, the save logic does not run through this path either so it did not do anything. Additionally, properly implement support for handling RegionFileSizeException in Moonrise.
52 lines
2.1 KiB
Diff
52 lines
2.1 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: astei <andrew@steinborn.me>
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Date: Sat, 28 Oct 2023 19:46:21 -0400
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Subject: [PATCH] Optimize VarInts
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https://github.com/PaperMC/Paper/pull/6957#issuecomment-985250854
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diff --git a/src/main/java/net/minecraft/network/VarInt.java b/src/main/java/net/minecraft/network/VarInt.java
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index 49a8ddc269d53458cfbd639b7de838c2e5765748..74ed47659d3e615c2dae7da98d5a8cf1559625bf 100644
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--- a/src/main/java/net/minecraft/network/VarInt.java
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+++ b/src/main/java/net/minecraft/network/VarInt.java
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@@ -9,6 +9,18 @@ public class VarInt {
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private static final int DATA_BITS_PER_BYTE = 7;
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public static int getByteSize(int i) {
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+ // Paper start - Optimize VarInts
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+ return VARINT_EXACT_BYTE_LENGTHS[Integer.numberOfLeadingZeros(i)];
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+ }
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+ private static final int[] VARINT_EXACT_BYTE_LENGTHS = new int[33];
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+ static {
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+ for (int i = 0; i <= 32; ++i) {
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+ VARINT_EXACT_BYTE_LENGTHS[i] = (int) Math.ceil((31d - (i - 1)) / 7d);
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+ }
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+ VARINT_EXACT_BYTE_LENGTHS[32] = 1; // Special case for the number 0.
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+ }
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+ public static int getByteSizeOld(int i) {
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+ // Paper end - Optimize VarInts
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for (int j = 1; j < 5; j++) {
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if ((i & -1 << j * 7) == 0) {
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return j;
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@@ -39,6 +51,21 @@ public class VarInt {
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}
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public static ByteBuf write(ByteBuf buf, int i) {
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+ // Paper start - Optimize VarInts
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+ // Peel the one and two byte count cases explicitly as they are the most common VarInt sizes
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+ // that the proxy will write, to improve inlining.
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+ if ((i & (0xFFFFFFFF << 7)) == 0) {
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+ buf.writeByte(i);
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+ } else if ((i & (0xFFFFFFFF << 14)) == 0) {
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+ int w = (i & 0x7F | 0x80) << 8 | (i >>> 7);
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+ buf.writeShort(w);
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+ } else {
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+ writeOld(buf, i);
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+ }
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+ return buf;
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+ }
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+ public static ByteBuf writeOld(ByteBuf buf, int i) {
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+ // Paper end - Optimize VarInts
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while ((i & -128) != 0) {
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buf.writeByte(i & 127 | 128);
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i >>>= 7;
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